权利要求：
1. A control module configured to be mounted in a fixture opening of a housing of a lighting fixture, the control module comprising:
an enclosure defining a central axis extending in a longitudinal direction, the enclosure having an enclosure opening at a first end, the enclosure configured to be received in the fixture opening of the lighting fixture;
a cover portion connected to the enclosure and covering the enclosure opening, the cover portion comprising an aperture in which a lens is located;
at least one printed circuit board housed within the enclosure, the at least one printed circuit board having a control circuit and a wireless communication circuit mounted thereto;
a detector positioned to receive infrared energy through the lens of the cover portion, the detector electrically coupled to the control circuit such that the control circuit is configured to detect at least one of an occupancy or vacancy condition in a space surrounding the control module; and
an antenna comprising first and second antenna elements electrically connected to the wireless communication circuit in a dipole antenna configuration, each of the first and second antenna elements extending from the at least one printed circuit board to respective curved portions that are positioned between the cover portion and the enclosure, the respective curved portions curving around the detector;
wherein the enclosure defines a cylindrical shape centered about the central axis of the control module, and the aperture of the cover portion, the lens, and the detector are centered along the central axis of the control module;
wherein the respective curved portions of the first and second antenna elements each comprise a circular segment having a center aligned with the central axis of the control module, and define respective inner edges that extend along a circular path that has a center at the central axis of the control module, and wherein an area of the first opening of the detector is located within an area of the circular path of the first and second antenna elements; and
wherein the control circuit is configured to cause the wireless communication circuit to communicate messages in wireless signals via the antenna.
2. The control module of claim 1, wherein the wireless communication circuit is configured to transmit the wireless signals via the antenna at a transmission frequency.
3. The control module of claim 2, wherein the detector comprises one or more pyroelectric elements that are responsive to infrared energy and a housing having a front surface with a first opening through which the pyroelectric elements receive the infrared energy.
4. The control module of claim 3, wherein the control module further comprises:
a shield located over the front surface of the housing of the detector and electrically coupled to a circuit common of the control module, the shield having a second opening arranged overtop of the first opening of the housing, the second opening of the shield being sized to shield the pyroelectric elements from the wireless signals transmitted by the antenna in response to the wireless communication circuit.
5. The control module of claim 4, wherein the at least one printed circuit board comprises a control printed circuit board extending through the enclosure in the longitudinal direction, and
wherein the control module further comprises:
a sensor printed circuit board on which the detector is mounted,
wherein the shield is electrically coupled the circuit common on the sensor printed circuit board.
6. The control module of claim 5, wherein the shield comprises a sidewall surrounding the housing of the detector and projections that extend from the sidewall and are configured to be electrically connected to the circuit common of the control module.
7. The control module of claim 6, wherein the projections extend from a lower edge of the sidewall, the projections configured to be received in through-holes in the sensor printed circuit board and electrically coupled to electrical pads surrounding the through-holes for electrically coupling the shield to the circuit common of the control module.
8. The control module of claim 6, wherein the projections extend perpendicularly from the sidewall and are configured to be electrically coupled to electrical pads on the sensor printed circuit board for electrically coupling the shield to the circuit common of the control module.
9. The control module of claim 4, wherein the housing of the detector is electrically conductive and is coupled to the circuit common of the control module, and the shield comprises a conductive material electrically coupled to the housing of the detector.
10. The control module of claim 9, wherein the conductive shield comprises a conductive adhesive for electrically coupling the shield to the housing of the detector.
11. The control module of claim 4, wherein the second opening of the shield is circularly-shaped and has a diameter between approximately 1/20 and 1/50 of a wavelength of the wireless signals at the transmission frequency.
12. The control module of claim 4, wherein the second opening of the shield is rectangularly-shaped and the longest dimension of the second opening has a length that is between approximately 1/20 and 1/50 of a transmission wavelength of the wireless signals at the transmission frequency.
13. The control module of claim 4, wherein an area of the second opening of the shield is smaller than an area of the first opening of the housing.
14. The control module of claim 3, wherein the housing of the detector is electrically conductive, and the first opening of the detector is square-shaped.
15. The control module of claim 2, wherein the detector comprises one or more pyroelectric elements that are responsive to the infrared energy and further comprises a housing that is electrically conductive and is coupled to a circuit common of the control module, the housing having a front surface with an opening through which the pyroelectric elements receive the infrared energy, the opening of the housing of the detector sized to shield the pyroelectric elements from wireless signals transmitted by the antenna in response to the wireless communication circuit.
16. The control module of claim 15, wherein the opening of the housing is circularly-shaped and has a diameter between approximately 1/20 and 1/50 of a wavelength of the wireless signals at the transmission frequency.
17. The control module of claim 15, wherein the opening of the housing is rectangularly-shaped and the longest dimension of the opening has a length that is between approximately 1/20 and 1/50 of a transmission wavelength of the wireless signals at the transmission frequency.
18. The control module of claim 2, wherein the detector is located relative to the antenna such that energy of the wireless signals transmitted by the antenna is at a maximum level.
19. The control module of claim 18, wherein a transmit power of the wireless communication circuit and the antenna is greater than 10 dBm.
20. The control module of claim 1, wherein the first and second antenna elements comprise respective elongated portions extending in the longitudinal direction from the at least one printed circuit board and through the enclosure opening, such that the curved portions are configured to be located outside of the housing of the lighting fixture.
21. The control module of claim 20, wherein the first and second antenna elements comprise respective offset portions extending between the respective elongated portions and respective curved portions, the offset portions configured such that the curved portions are located farther away from the central axis than the elongated portions.
22. The control module of claim 21, wherein the elongated portions extend parallel to each other between the at least one printed circuit board and the respective offset portions.
23. The control module of claim 1, wherein the enclosure comprises first and second clips configured to mount the control module within the fixture opening.
24. The control module of claim 1, wherein the curved portions of the first and second antenna elements are configured to be located outside of the housing of the lighting fixture.
25. A control module configured to be mounted in a fixture opening of a housing of a lighting fixture, the control module comprising:
an enclosure defining a central axis extending in a longitudinal direction, the enclosure having an enclosure opening at a first end, the enclosure configured to be received in the fixture opening of the lighting fixture;
a cover portion connected to the enclosure and covering the enclosure opening, the cover comprising an aperture in which a lens is located;
at least one printed circuit board housed within the enclosure, the at least one printed circuit board having a control circuit and a wireless communication circuit mounted thereto;
a detector positioned to receive infrared energy through the lens of the cover portion, the detector electrically coupled to the control circuit such that the control circuit is configured to detect at least one of an occupancy or vacancy condition in a space surrounding the control module; and
an antenna comprising first and second antenna elements electrically connected to the wireless communication circuit in a dipole antenna configuration, each of the first and second antenna elements extending from the at least one printed circuit board to respective curved portions that are positioned between the cover portion and the enclosure, the respective curved portions curving around the detector;
wherein the control circuit is configured to cause the wireless communication circuit to communicate messages in wireless signals via the antenna; and
wherein the enclosure comprises first and second clips that are configured to mount the control module within the fixture opening and are located adjacent to each other, each of the first and second clips comprising a plurality of teeth configured to engage a structure surrounding the fixture opening, and wherein the teeth of the first and second clips are staggered relative to each other, such that one tooth of the first clip or the second clip is configured to engage the fixture opening at a single time.
26. The control module of claim 25, wherein, as the control module is inserted into the fixture opening, a first tooth of the first clip is configured to engage the structure surrounding the fixture opening first, a second tooth of the second clip is configured to engage the structure surrounding the fixture opening after the first tooth, a third tooth of the first clip is configured to engage the structure surrounding the fixture opening after the second tooth, and a fourth tooth of the second clip is configured to engage the structure surrounding the fixture opening after the third tooth.
27. The control module of claim 25, wherein, the first clip comprises a first number of teeth and the second clip comprises a second number of teeth, such that the control module is configured to be installed in the fixture opening at a third number of distinct depths of insertion, where the third number is equal to the first number plus the second number.
28. A control module configured to be mounted in a fixture opening of a housing of a lighting fixture, the control module comprising:
an enclosure defining a central axis extending in a longitudinal direction, the enclosure having an enclosure opening at a first end, the enclosure configured to be received in the fixture opening of the lighting fixture;
a cover portion connected to the enclosure and covering the enclosure opening, the cover comprising an aperture in which a lens is located;
at least one printed circuit board housed within the enclosure, the at least one printed circuit board having a control circuit and a wireless communication circuit mounted thereto;
a detector positioned to receive infrared energy through the lens of the cover portion, the detector electrically coupled to the control circuit such that the control circuit is configured to detect at least one of an occupancy or vacancy condition in a space surrounding the control module; and
an antenna comprising first and second antenna elements electrically connected to the wireless communication circuit in a dipole antenna configuration, each of the first and second antenna elements extending from the at least one printed circuit board to respective curved portions that are positioned between the cover portion and the enclosure, the respective curved portions curving around the detector;
wherein the control circuit is configured to cause the wireless communication circuit to communicate messages in wireless signals via the antenna; and
wherein the at least one printed circuit board comprises one or more first attachment tabs extending from sides of the at least one printed circuit board, the one or more first attachment tabs configured to attach the at least one printed circuit board to a fabrication panel during manufacturing of the control module, and wherein, after the at least one printed circuit board is detached from the fabrication panel, the one or more first attachment tabs are configured to be received within gaps in the enclosure of the control module to align the at least one printed circuit board within the enclosure.
29. The control module of claim 28, wherein the at least one printed circuit board comprises a control printed circuit board extending through the enclosure in the longitudinal direction, and
wherein the control module further comprises:
a sensor printed circuit board on which the detector is mounted, the sensor printed circuit board electrically connected to the control printed circuit board via a flexible connector, the sensor printed circuit board oriented perpendicular to the control printed circuit board, such that the detector is directed towards the lens and the aperture in the cover portion;
wherein the one or more first attachment tabs are configured to prevent movement of the control printed circuit board in the longitudinal direction.
30. The control module of claim 29, further comprising:
a second connector configured to electrically connect the control module to an external power source; and
a power printed circuit board to which the second connector is mounted, the power printed circuit board electrically connected to the control printed circuit board and the sensor printed circuit board via the flexible connector, the power printed circuit board oriented parallel to the control printed circuit board, the power printed circuit board comprising one or more second attachment tabs extending from sides of the power printed circuit board and configured to attach the power printed circuit board to a respective fabrication panel during manufacturing of the control module;
wherein, after the power printed circuit board is detached from the respective fabrication panel, the one or more second attachment tabs of the power printed circuit board are configured to be received within respective gaps in the enclosure of the control module to align the power printed circuit board within the enclosure and prevent movement of the power printed circuit board in the longitudinal direction.
31. The control module of claim 30, wherein the flexible connector forms an inner layer of each of the control printed circuit board, the sensor printed circuit board, and the power printed circuit board.
具体实施方式：
[0019]FIG. 1 is a diagram of an example load control system 100 for controlling the amount of power delivered from an alternating-current (AC) power source (not shown) to one or more electrical loads. The load control system 100 may be installed in a load control environment, such as a room 102 of a building. The load control system 100 may comprise a plurality of control devices configured to communicate with each other via wireless signals, e.g., radio-frequency (RF) signals 104, 105. For example, the control-source devices, control-target devices, and/or the system controller 110 may be configured to transmit and receive the RF signals 104, 105. The RF signals 104, 105 may use a proprietary RF protocol, such as the CLEAR CONNECT protocol (e.g., the CLEAR CONNECT TYPE A protocol and/or the CLEAR CONNECT TYPE X protocol). Alternatively, the RF signals 104, 105 may be transmitted using a different RF protocol, such as, a standard protocol, for example, one of WI-FI, BLUETOOTH, BLUETOOTH LOW ENERGY (BLE), ZIGBEE, Z-WAVE, THREAD, KNX-RF, ENOCEAN RADIO protocols, or a different standard or proprietary protocol. Alternatively or additionally, the load control system 100 may comprise a wired digital communication link coupled to one or more of the control devices to provide for communication between the control devices.
[0020]The control devices of the load control system 100 may comprise a number of control-source devices (e.g., input devices operable to transmit messages in response to receiving user inputs, detecting occupancy/vacancy conditions, measuring ambient light intensity level, etc.) and a number of control-target devices (e.g., load control devices operable to receive messages and control electrical loads in response to the received messages). A single control device of the load control system 100 may operate as both a control-source and a control-target device. For example, the control-source device may be an originating device or intermediary device from which a message is originated and a control-target device may be a destination device or intermediary device to which the message is transmitted.
[0021]The lighting control system 100 may comprise one or more lighting fixtures 110a, 110b, 110c, 110d that may be installed in the room 102 (e.g., in the ceiling of the room). Each lighting fixture 110a-110d may include a lighting load (e.g., an LED light source) and a respective lighting control device (e.g., an LED driver, ballast, dimming or switching module, or any combination of such devices) for controlling the respective lighting load of the lighting fixture 110a-110d. The lighting control devices may be control-target devices capable of controlling a respective lighting load in response to control instructions received in digital messages.
[0022]The control-source devices of the load control system 100 may be used to control the lighting fixtures 110a-110d. The control-source devices may be input devices capable of communicating messages (e.g., digital messages) to the control-target devices of the load control system 100, such as the lighting control devices in the lighting fixtures 110a-110d, e.g., via the RF signals 104, 105. The control-source devices may transmit the messages for controlling (e.g., indirectly controlling) the amount of power provided to the lighting loads by the respective lighting control devices in the respective lighting fixtures 110a-110d. The messages may include control instructions (e.g., load control instructions) or another indication that causes the lighting control devices to determine load control instructions for controlling the respective lighting loads. The control-sources devices of the load control system 100 may comprise, for example, a remote control device 130, which may be configured to transmit messages to the lighting control devices in the respective lighting fixture 110a-110d via the RF signals 104 in response to actuations of one or more buttons of the remote control device 130. For example, the remote control device 130 may be battery-powered.
[0023]The load control system 100 may include control modules (e.g., sensor devices and/or fixture controllers), such as control modules 120a, 120b, 120c, 120d. The control modules 120a-120d may each be attached to one of the lighting fixture 110a-110d. The control modules 120a-120d may each be electrically connected to a respective lighting control device within the lighting fixtures 110a-110d for controlling lighting loads. The control modules 120a-120d may include one or more sensors (e.g., sensing circuits) for controlling the lighting loads within the respective lighting fixtures 110a-110d. For example, the control modules 120a-120d may include an occupancy sensing circuit (e.g., may operate as an occupancy sensor) and/or a daylight sensing circuit (e.g., may operates as a daylight sensor). The control modules 120a-120d may be control-source devices that transmit digital messages to respective lighting control devices to which they are connected (e.g., on a wired communication link). The control modules 120a-120d may also, or alternatively, be control-target devices for receiving digital messages from other devices in the system, such as the remote control device 130 or another control-source device, (e.g., on a wireless communication link via the RF signals 104, 105) for controlling the respective lighting control devices to which the control modules 120a-120d are connected.
[0024]The occupancy sensing circuit in the control modules 120a-120d may be configured to detect occupancy and/or vacancy conditions in the room 102 in which the load control system 100 is installed. The control modules 120a-120d may control the lighting control devices in the respective lighting fixtures 110a-110d in response to the occupancy sensors detecting the occupancy or vacancy conditions. The control modules 120a-120d may each also operate as a vacancy sensor, such that messages are transmitted in response to detecting a vacancy condition (e.g., messages may not be transmitted in response to detecting an occupancy condition). The daylight sensing circuit in the control modules 120a-120d may be configured to measure an ambient light intensity level in the visible area of the room 102 in which the load control system 100 is installed. The control modules 120a-120d may control the lighting control devices in the respective lighting fixture 110a-121d in response to the ambient light intensity level measured by the respective daylight sensing circuit.
[0025]The control modules 120a-120d may each comprise a memory or other computer-readable storage medium capable of storing instructions thereon for being executed by the control circuit. Each control module 120a-120d may store in the memory unique identifiers of other devices in the load control system 100 with which the control module is associated to enable recognition of messages from and/or transmission of messages to associated control devices. For example, each control module 120a-120d may store in the memory the unique identifier of the remote control device 130 with which the control module is associated.
[0026]The control modules 120a-120d may each comprise one or more wireless communication circuits for transmitting and/or receiving messages, e.g., via the RF signals 104, 105. A first wireless communication circuit of each of the control modules 120a-120d may be capable of communicating on a first wireless communication link (e.g., a wireless network communication link) and/or communicating using a first wireless protocol (e.g., a wireless network communication protocol, such as the CLEAR CONNECT and/or THREAD protocols) via the RF signals 104. A second wireless communication circuit of each of the control modules 120a-120d may be capable of communicating on a second wireless communication link (e.g., a short-range wireless communication link) and/or communicating using a second wireless protocol (e.g., a short-range wireless communication protocol, such as the BLUETOOTH and/or BLUETOOTH LOW ENERGY (BLE) protocols) via the RF signals 105.
[0027]The control modules 120a-120d may each comprise one or more wired communication circuits for transmitting and/or receiving signals and/or messages via respective wired communication links. For example, each control module 120a-120d may transmit and/or receive messages via the wired communication circuit on a wired power/communication link in the respective lighting fixture 110a-110d. The wired power/communication link may be used for providing communications and/or power within each of the lighting fixtures 110a-110d. For example, the wired power/communication link may comprise, for example, a Digital Addressable Lighting Interface (DALI) link or another digital communication link. The wired power/communication link in each lighting fixture 110a-110d may be used by the respective control module 120a-120d to transmit messages (e.g., including commands) to the respective lighting control devices for controlling an intensity level and/or color (e.g., color temperature) of the respective lighting loads. Each control module 120a-120d may receive messages (e.g., including feedback information) from the respective lighting control device that indicate the intensity level and/or color of the respective lighting loads. In addition, the lighting control devices in each of the lighting fixtures 110a-110d may each receive power from an AC power source (not shown) and may each supply power to the respective control module 120a-120d via the wired power/communication link 120. Though the wired power/communication link may be described herein as a single link, the wired power/communication link may be comprised of multiple links. For example, the lighting control devices of each lighting fixture 110a-110d may provide power to the respective control module 120a-120d via a two-wire power bus, while communications may be performed between the control module and the lighting control devices 124 using an analog communication link, such as a 0-10V control link or another communication link through which power may not be provided (e.g., an RS-485 digital communication link).
[0028]The load control system 100 may include a system controller 140 that is configured to transmit and/or receive messages via wired and/or wireless communications. For example, the system controller 140 may be configured to transmit and/or receive the RF signals 104, to communicate with one or more control devices (e.g., control-source devices and/or control-target devices, such as the control modules 120a-120d). The system controller 140 may communicate digital messages between associated control devices. The system controller 140 may be coupled to one or more wired control devices (e.g., control-source devices and/or control-target devices) via a wired digital communication link. The system controller 140 may also, or alternatively, be capable of communicating on a third wireless communication link (e.g., a standard communication link) and/or communicating using a third wireless protocol (e.g., a standard communication protocol, such as the Internet protocol (IP) and/or WI-FI protocol), via RF signals 106. For example, the system controller 140 may be configured to transmit and/or received messages on a network 108, such as the Internet, via the RF signals 106.
[0029]The system controller 140 may be configured to transmit and receive messages between control devices. For example, the system controller 140 may transmit messages to the control modules 120a-120d for controlling the lighting loads in the lighting fixtures 110a-110d in response to the messages received from the remote control device 130 (e.g., via the RF signals 104). The messages may include configuration data for configuring the control devices (e.g., the control modules 120a-120d) and/or control data (e.g., commands) for controlling the lighting loads in the lighting fixtures 110a-110d.
[0030]The load control system 100 may be commissioned to enable control of the lighting loads in the lighting fixtures 110a-110d based on commands communicated from the control devices (e.g., the remote control device 130) to the control modules 120a-120d for controlling the lighting loads in the lighting fixtures 110a-110d. For example, the remote control device 130 may be associated with the control modules 120a-120d within the lighting fixtures 110a-110d. Association information may be stored on the associated devices, which may be used to communicate and identify messages and/or commands at associated devices for controlling electrical devices in the load control system 100. The association information may include the unique identifier of one or more of the associated devices. The association information may be stored at the control modules 120a-120d, the system controller 140, or at other control devices that may be implemented to enable communication and/or identification of messages between the control devices.
[0031]A network device 150 may be in communication with the control modules 110a-110d and/or the system controller 140 for commissioning and/or controlling the control devices of the load control system 100. The network device 150 may comprise a wireless phone, a tablet, a laptop, a personal digital assistant (PDA), a wearable device (e.g., a watch, glasses, etc.), or other computing device. The network device 150 may be operated by a user 152. The network device 150 may be configured to communicate with the system controller 140 and/or control devices connected to the network 108 by transmitting and/or receiving messages using a standard wireless protocol (e.g., via the RF signals 108). In addition, the network device 150 may be configured to communicate with the control modules 110a-110d by transmitting and/or receiving messages via the short-range wireless communication link (e.g., using the RF signals 106). Further, the network device 150 may be configured to transmit and/or receive beacon signals that may be used to commission the load control system 100 via the short-range wireless communication link (e.g., using the RF signals 106).
[0032]FIGS. 2 and 3 are perspective views depicting an example control module 200 (e.g., a sensor module), which may be deployed as the control modules 120a-120d for the load control system 100 shown in FIG. 1. FIG. 2 also shows a partial view an example lighting fixture 202 (e.g., a corner 203 of the lighting fixture 202) into which the control module 200 may be installed (e.g., attached and/or mounted). FIG. 4 is a radial side view of the control module 200 (e.g., looking in a radial direction R) and FIG. 5 is a transverse side view of the control module 200 (e.g., looking in a transverse direction T, i.e., 90° from the view of FIG. 4). FIGS. 6 and 7 are exploded views of the control module 200. FIG. 8 is a side cross-sectional view of the control module 200 taken through the center of the control module 200 (e.g., through the line shown in FIG. 4). The control module 200 may be configured to be attached (e.g., mounted) to the lighting fixture 202 (e.g., one of the lighting fixtures 110a-110d) and electrically connected to different types of lighting control devices, such as different types of LED drivers, for example. The control module 200 may be electrically connected to the lighting control device(s) (e.g., via a wired communication link and/or control link) to enable control of the lighting control device(s) in response to information provided from the control module 200.
[0033]The control module 200 may comprise an enclosure 210 having a first enclosure portion 212a and a second enclosure portion 212b. The enclosure 210 of the control module 200 may be configured to be received in a fixture opening 204 (e.g., a circular fixture opening) of a housing 205 of the lighting fixture 202. The fixture opening 204 may extend from an outer surface 206 (e.g., a bottom surface) to an inner surface 208 of the housing 205 of the lighting fixture 202, such that the housing 205 (e.g., the material of the housing) is characterized by a thickness T (e.g., as shown in FIG. 2). For example, the fixture opening 204 may have a diameter of approximately 0.86-0.95 inches. The first and second enclosure portions 212a, 212b of the enclosure 210 may each comprise respective side walls 214a, 214b shaped to allow the enclosure 210 to be received in the fixture opening 204. For example, the enclosure 210 may extend in a longitudinal direction L and may have a cylindrical shape that may be centered about a central axis 211 of the control module 200 (e.g., that also extends in the longitudinal direction L). For example, the longitudinal direction L may be defined by the central axis 211. The first and second enclosure portions 212a, 212b may be attached to each other, for example, to define the cylindrical shape of the enclosure 210. When the first and second enclosure portions 212a, 212b are attached to each other, the enclosure 210 may define an opening 213 in a bottom side 215 of the enclosure 210, as shown in FIG. 8. The first and second enclosure portions 212a, 212b of the enclosure 210 may comprise respective flange portions 216a, 216b that surround the bottom side 215 of the enclosure 210 at the ends of the side walls 214a, 214b (e.g., that surround the opening 213 of the enclosure 210). The flange portions 216a, 216b may extend radially from the opening 213. The first enclosure portion 212a may comprise snaps 217 configured to engage (e.g., be attached to) ledges 218 in recesses 219 in the second enclosure portion 212a to affix the first and second enclosure portions 212a, 212b together, as shown in FIGS. 6 and 7.
[0034]The control module 200 may comprise a cover portion 220 (e.g., a bezel) configured to cover the opening 213 in the enclosure 210 and/or the fixture opening 204 in the lighting fixture 202 to which the control module 200 is mounted. The control module 200 may further comprise a lens 222 received in an aperture 221 in a front surface 223 of the cover portion 220. The aperture 221 and the lens 222 may be centered about the central axis 211 of the control module 200. When the fixture opening 204 is located in a bottom surface of the lighting fixture 202, the cover portion 220 and the lens 222 may be directed downward (e.g., towards the floor). When the control module 200 is installed (e.g., fully inserted) in the fixture opening 204, a rear edge 224 (e.g., a rear surface) of the cover portion 220 may contact the outer surface 204 of the lighting fixture 204. The lens 222 may be dome-shaped and made of at least a partially infrared or visible light transparent material to allow infrared energy to enter the enclosure 210 through the aperture 221. The cover portion 220 may comprise tabs 225 (e.g., as shown in FIG. 8) configured to contact the flange portions 216a, 216b of the first and second enclosure portions 212a, 212b to attach the cover portion 220 to the enclosure 210.
[0035]The lens 222 may be configured to rest in (e.g., be received by) a support structure 226 of the cover portion 220. The cover portion 220 may comprise a rib 227 extending around an inner surface 228 of the lens 222. The rib 227 may be configured to engage complementary features in the cover portion 220. When the lens 222 is inserted into the aperture 221 in the front surface 223 of the cover portion 220, the rib 227 may be held underneath an inner edge 229 of the support structure 226 to retain the lens 222 in the aperture 221. For example, the support structure 226 may define a recess 231 that is configured to receive the rib 227 such that the lens 222 is releasably secured to the cover portion 220. The lens 222 may also comprise projections 233 that may be received around a corresponding structure (not shown) of the cover portion 220 when the lens 222 is received within the aperture 221.
[0036]The control module 200 may comprise an occupancy detection circuit having a detector 270. For example, the occupancy detection circuit may comprise a passive infrared (PIR) sensing circuit, and the detector 270 may comprise a pyroelectric detector. The detector 270 may be configured to detect infrared energy from an occupant in a load control environment (e.g., such as the room 102 shown in FIG. 1) that may enter the control module 200 through the aperture 221 of the cover portion 220 (e.g., through the lens 222). The control module 200 may be configured to detect motion in the load control environment (e.g., occupancy and/or vacancy conditions) in response to the infrared energy detected by the detector 270. When the fixture opening 204 is located in a bottom surface of the lighting fixture 202, the control module 200 may be configured to detect occupancy and/or vacancy conditions in the space (e.g., the load control environment) beneath the lighting fixture 202 to which the control module 200 is attached.
[0037]The first and second enclosure portions 212a, 212b may each comprise one or more clips (e.g., first clips 230a, 230b and/or second clips 240a, 240b) for mounting the control module 200 to the lighting fixture 202 (e.g., within the fixture opening 204). For example, the first enclosure portion 212a may comprise a first clip 230a and a second clip 240a. The first and second clips 230a, 240a of the first enclosure portion 212a may each comprise a respective arm 232a, 242a. The first and second clip 230a, 240a of the first enclosure portion 212a may each comprise a plurality of teeth located at an end 234a, 244a of the respective arm 232a, 242a. For example, the first clip 230a of the first enclosure portion 212a may comprise a first tooth 235a and a second tooth 236a. The first tooth 235a may define an engagement surface 237a and the second tooth 236a may define an engagement surface 238a. The second clip 240a of the first enclosure portion 212a may comprise a first tooth 245a and a second tooth 246a. The first tooth 245a may define an engagement surface 247a and the second tooth 246a may define an engagement surface 248a. The first teeth 235a, 245a and the second teeth 236a, 246a of the first and second clips 230a, 240a of the first enclosure portion 212a may be located at different locations along the length of each of the first and second clips 230a, 240a (e.g., the first and second clips 230a, 240a are not identical). For example, the first tooth 235a and the second tooth 236a of the first clip 230a may be displaced along the first clip 230a in a first layout, and the first tooth 245a and the second tooth 246a of the second clip 240a may be displaced along the second clip 240a in a second layout. While each clip 230a, 240a may comprise two teeth as shown in FIGS. 2-12, each of the clips may comprise more or less teeth, and the first and second clips 230a, 240a may comprise different numbers of teeth.
[0038]The second enclosure portion 212b may comprise a first clip 230b and a second clip 240b. The first and second clips 230b, 240b of the second enclosure portion 212b may each comprise a respective arm 232b, 242b. The first and second clip 230b, 240b of the second enclosure portion 212b may each comprise a plurality of teeth located at an end 234b, 244b of the respective arm 232b, 242b. For example, the first clip 230b of the second enclosure portion 212b may comprise a first tooth 235b and a second tooth 236b. The first tooth 235b may define an engagement surface 237b and the second tooth 236b may define an engagement surface 238b. The second clip 240b of the second enclosure portion 212b may comprise a first tooth 245b and a second tooth 246b. The first tooth 245b may define an engagement surface 247b and the second tooth 246b may define an engagement surface 248b. The first teeth 235b, 245b and the second teeth 236b, 246b of the first and second clips 230b, 240b of the second enclosure portion 212b may be located at different locations relative to each other along the length of each clip 230b, 240b (e.g., the first and second clips 230b, 240b are not identical). For example, the first tooth 235b the second tooth 236b of the first clip 230b may be displaced along the first clip 230b in the first layout, and the first tooth 245b the second tooth 246b of the second clip 240b may be displaced along the second clip 240b in the second layout. The first clip 230a of the first enclosure portion 212a and the first clip 230b of the second enclosure portion 212b may be identical (e.g., having the first layout of teeth), and the second clip 240a of the first enclosure portion 212a and the second clip 240b of the second enclosure portion 212b may be identical (e.g., having the second layout of teeth). While the control module 200 is described herein with the first and second enclosure portions 212a, 212b each having one of the first clips 230a, 230b and one of the second clips 240a, 240b, one of the first and second enclosure portions 212a, 212b could have two of the first clips (e.g., both having the first layout of teeth) and the other of the first and second enclosure portions 212a, 212b could have two of the second clips (e.g., both having the second layout of teeth).
[0039]The first and second clips 230a, 240a of the first enclosure portion 212a and the first and second clips 230b, 240b of the second enclosure portion 212b may be received by the fixture opening 204 for mounting the control module 200 to the lighting fixture 202. One or more of the teeth 235a, 236a, 245a, 246a of the first enclosure portion 212a and one or more of the teeth 235b, 236b, 245b, 246b of the second enclosure portion 212b may be configured to engage the fixture opening 204 for mounting (e.g., locking) the control module 200 within the fixture opening 204 of the lighting fixture 202. One or more of the teeth 235a, 235b, 236a, 236b, 245a, 245b, 246a, 246b may secure the control module 200 within the fixture opening 204, such that the rear edge 224 of the cover portion 220 contacts the bottom surface 204 of the lighting fixture 202. The clips 230a, 230b, 240a, 240b may be resiliently biasable, for example, towards the central axis 211. As the control module 210 is inserted into the fixture opening 204 (e.g., along an insertion direction 209 shown in FIG. 2), the arms 232a, 232b, 242a, 242b of the respective clips 230a, 230b, 240a, 240b may be configured to bend in towards the sidewalls 214a, 214b of the first and second enclosure portions 212a, 212b such that the teeth 235a, 235b, 236a, 236b, 245a, 245b, 246a, 246b are biased toward the sidewalls 214a, 214b. The surface surrounding the fixture opening 204 may press the clips 230a, 230b, 240a, 240b toward the sidewalls 214a, 214b such that the clips 230a, 230b, 240a, 240b fit within the fixture opening 204, as the control module 200 is inserted into the fixture opening 204. The control module 200 may be secured in position within the fixture opening 204 when one or more of the engagement surfaces 237a, 237b, 238a, 238b, 247a, 247b, 248a, 248b contacts the inner surface 208 of the material of the housing 205 of the lighting fixture 202. For example, one or more of the engagement surfaces 237a, 237b, 238a, 238b, 247a, 247b, 248a, 248b may be configured to prevent the control module 200 from falling out of the fixture opening 204.
[0040]When the first and second enclosure portions 212a, 212b are attached to each other, the first and second clips 230a, 230b, 240a, 240b may be arranged in pairs (e.g., adjacent pairs). Each pair of clips may have one clip having the first layout of teeth (e.g., one of the first clips 230a, 230b) and one clip having the second layout of teeth (e.g., one of the second clips 240a, 240b). For example, the first clip 230a of the first enclosure portion 212a and the second clip 240b of the second enclosure portion 212b may be located adjacent to each other, e.g., as a first pair. Since the first and second clips 230a, 240b have different layouts of teeth (e.g., the first and second layouts, respectively), the teeth 235a, 236a of the first clip 230a of the first enclosure portion 212a and the teeth 245b, 246b of the second clip 240b of the second enclosure portion 212b may be located at different locations relative to each other along the length of each clip 230a, 240b. For example, the teeth 235a, 236a of the first clip 230a may be staggered as compared to the teeth 245b, 246b of the second clip 240b (e.g., the teeth of the first and second clips 230a, 240b may be staggered relative to each other). For example, either one of the teeth 235a, 236a of the first clip 230a or one of the teeth 245b, 246b of the second clip 240b (e.g., one tooth of the pair of clips 230a, 240b) may engage the fixture opening 204 (e.g., the surface defining the fixture opening 204) at a single time.
[0041]Similarly, the first clip 230b of the second enclosure portion 212b and the second clip 240a of the first enclosure portion 212a may be located adjacent to each other, e.g., as a second pair (e.g., as shown in FIG. 4). Since the first and second clips 230b, 240a have different layouts of teeth (e.g., the first and second layouts, respectively), the teeth 235b, 236b of the first clip 230b of the second enclosure portion 212b and the teeth 245a, 246a of the second clip 240a of the first enclosure portion 212a may be located at different locations relative to each other along the length of each clip 230b, 240a. For example, the teeth 235b, 236b of the first clip 230b may be staggered as compared to the teeth 245a, 246a of the second clip 240a (e.g., the teeth of the first and second clips 230b, 240a may be staggered relative to each other). For example, either one of the teeth 235b, 236b of the first clip 230b or one of the teeth 245a, 246a of the second clip 240a (e.g., one tooth of the pair of 230b, 240a) may engage the fixture opening 204 (e.g., the surface defining the fixture opening 204) at a single time. Even though both pairs of clips are located at the junction of the first and second enclosure portions 212a, 212b as shown in FIGS. 2-8, the pairs of clips may be located at other locations on each of the first and second enclosure portions 212, 212b, for example, near the center of each of the respective first and second enclosure portions 212, 212b (e.g., shifted 90 degrees from the positions shown in FIGS. 2-8). In addition, while the first and second clips 230a, 230b, 240a, 240b are located immediately adjacent to each other when the first enclosure portion 212a is connected to the second enclosure portion 212b, the first and second clips of each pair of clips may also be distanced apart, for example, with up to approximately one-fourth of the circumference of the enclosure 210 between the first and second clips of each pair (e.g., the first and second clips may be spaced apart by approximately 90 degrees).
[0042]The teeth 235a, 235b, 236a, 236b, 245a, 245b, 246a, 246b may be configured to allow the control module 210 to be mounted to various lighting fixtures that have housings made of materials of differing thicknesses. The staggering of the teeth between adjacent clips as described above may allow the control module 200 to be installed in the fixture opening 204 at one of a number of different positions, such as four different positions P1, P2, P3, P4 (e.g., insertion depths) as shown in FIG. 4. The four different positions P1-P4 may represent the different thicknesses of the materials of the housings of the various lighting fixtures to which the control module 200 may be mounted. In some examples, a first clip of a pair of clips (e.g., the first clip 230b shown in FIG. 4) may comprise a first number X of teeth and a second clip of the pair of clips (e.g., the second clip 240a shown in FIG. 4) may comprise a second number Y of teeth, such that the control module 200 may be configured to be installed in the fixture opening 204 at a third number Z of distinct positions (e.g., depths of insertion), where the third number Z may be equal to the first number X plus the second number Y (e.g., Z=X+Y).
[0043]As shown by the adjacent first and second clips 230b, 240a (e.g., the second pair of clips) shown in FIG. 4, alternating teeth on the first and second clips 230b, 240a (e.g., and on the first and second clips 230a, 240b) may engage the fixture opening 204 (e.g., a structure surrounding the fixture opening 204) as the control module 200 is inserted into the fixture opening 204 (e.g., along the insertion direction 209 shown in FIG. 2). While the control module 200 is being inserted into the fixture opening 204, the tooth 235b of the first clip 230b may contact the structure surrounding th