Dimmer

Abstract

To improve the efficiency of lighting system installation work.SOLUTION: According to an embodiment, a dimmer includes a microcomputer having first and second PWM dimming signal circuits that transmit first and second PWM signals via first and second PWM output systems to a dimmer tool connected to a lighting device, and first and second abnormality detection units that are connected in series with the first and second PWM dimming signal circuits and output first and second voltage measurement values to the microcomputer. The microcomputer detects an abnormality when the time during which the difference between the first and second voltage measurement values and the theoretical values of the first and second PWM signals is outside a predetermined range is equal to or longer than a predetermined period.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] This embodiment relates to a dimmer.

Background Art

[0002] For the control method of LED (Light Emitting Diode) lighting fixtures, there are, for example, a signal line type and a digital control type. The signal line type may be called a PWM (Pulse Width Modulation) control method. The signal line type sends a PWM signal as a control signal from a lighting control device to a lighting fixture. The digital control type sends a digital signal as a control signal from a lighting control device to a lighting fixture. For the digital control type, there is, for example, a DALI (registered trademark) (Digital Addressable Lighting Interface) control method.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] This embodiment provides a dimmer that enables efficient installation of a lighting system.

Means for Solving the Problems

[0005] According to this embodiment, the dimmer includes a microcomputer, a first abnormality detection unit, and a second abnormality detection unit. The microcomputer includes a first PWM dimming signal circuit that transmits a first PWM signal having a pulse waveform for the time variation of the voltage to a dimming device connected to the lighting device via a first PWM output system, and a second PWM dimming signal circuit that transmits a second PWM signal having a pulse waveform for the time variation of the voltage to the dimming device via a second PWM output system. The first abnormality detection unit is connected in series with the first PWM dimming signal circuit and outputs a first voltage measurement value to the microcomputer. The second abnormality detection unit is connected in series with the second PWM dimming signal circuit and outputs a second voltage measurement value to the microcomputer. The microcomputer detects an abnormality when the time during which the difference between the first voltage measurement value and the theoretical value of the first PWM signal is outside a predetermined range is equal to or longer than a predetermined period, detects an abnormality when the time during which the difference between the second voltage measurement value and the theoretical value of the second PWM signal is outside a predetermined range is equal to or longer than a predetermined period, and stops the operation when an abnormality is detected.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0007] Hereinafter, each embodiment will be described with reference to the drawings. In the following description, for substantially the same functions and components, the same reference numerals are given, and duplicate explanations are made only when necessary.

[0008] [First Embodiment] The first embodiment relates to an illumination system that performs wireless communication with a controller. In the first embodiment, the controller may be, for example, a device such as a personal computer, a tablet computer, a mobile phone, a mobile computer, a remote controller, or a control terminal.

[0009] FIG. 1 is a block diagram showing an example of the configuration of the illumination system 1 according to the first embodiment. Note that the various components illustrated in FIG. 1 may be freely combined or freely separated as long as they can realize the same or similar functions and actions.

[0010] The illumination system 1 includes a wireless module 2, a power supply unit 3, and an illumination device (for example, a lighting unit) 4. The wireless module 2 and the power supply unit 3 are communicably and power-supplyably connected by a wired transmission path 5 that transmits signals and power, such as a wire harness or a cable harness.

[0011] The wireless module 2 receives a wireless signal from the controller 6 using wireless communication. The wireless module 2 is electrically connected to the power supply unit 3 by the wired transmission path 5. The wireless module 2 receives power from the power supply unit 3 via the wired transmission path 5. The wireless module 2 transmits a signal to the power supply unit 3 via the wired transmission path 5 and receives a signal from the power supply unit 3 via the wired transmission path 5.

[0012] The wireless module 2 is used by being electrically connected to a power supply unit 3 for wireless control. The wireless module 2 includes, for example, an operation unit 7, a display unit 8, a connection unit 9, and a communication module 10.

[0013] The operation unit 7 includes, for example, buttons or switches. The operation unit 7 receives the operations of an operator (user) and transmits an operation signal indicating the content of the operator's operation to the communication module 10. The operation unit 7 may include, for example, an area setting switch, a check switch, and a forced release (reset) switch. The area setting switch, the check switch, and the forced reset switch may be combined as appropriate. More specifically, the operation unit 7 may include, for example, a DIP switch or a push button switch.

[0014] The area setting switch can set identification information (for example, a number) of the area to which the wireless module 2, the power supply unit 3, and the lighting device 4 belong, and can also function as a start switch for the check mode.

[0015] When the wireless module 2 is started in the check mode, for example, it lights, turns off, or blinks the lighting device 4 according to a lighting operation patterned on the time axis or a check pattern such as constant lighting.

[0016] During the check mode, the forced reset switch may be used as a switch for switching the pattern of the check mode. Specifically, during the check mode, the forced reset switch receives the designation of any one of a plurality of check modes. The wireless module 2 operates according to the check mode designated by the forced reset switch during the check mode.

[0017] In the first embodiment, the wireless module 2 can start the check mode before performing wireless communication pairing.

[0018] The display unit 8 includes, for example, an LED (Light Emitting Diode) or a liquid crystal device. The display unit 8 receives a display signal indicating, for example, the state of the wireless module 2 or the lighting system 1 from the communication module 10 and performs a display corresponding to the display signal. As a specific example, the display unit 8 may be an independent monitor LED of the first color and the second color. The display unit 8 represents the energized state and the communication state by lighting, extinguishing, or blinking.

[0019] The connection part 9 can be connected to one end of the wired transmission path 5. One of the plurality of terminals of the wired transmission path 5 connected to the connection part 9 functions as a mode select terminal when the power supply unit 3 operates in the analog communication control mode.

[0020] The communication module 10 includes a communication antenna 11, a storage unit 12, and a calculation unit 13. The communication module 10 receives power from the power supply unit 3 via the wired transmission path 5 and the connection part 9. The communication module 10 communicates wirelessly with an external controller 6. The communication module 10 communicates wiredly with the power supply unit 3 via the connection part 9 and the wired transmission path 5.

[0021] The communication antenna 11 receives radio waves and transmits an electrical signal to the calculation unit 13.

[0022] The storage unit 12 stores software such as, for example, data generated by the calculation unit 13, data used by the calculation unit 13, or a program used by the calculation unit 13. The software stored in the storage unit 12 may include, for example, various setting values, data received from the external controller 6, or data received from the power supply unit 3. The storage unit 12 may store, for example, scene information, belonging information indicating the floor area group to which the wireless module 2 belongs. In the first embodiment, a scene means a lighting state, for example, a lighting effect formed by a lighting device.

[0023] The arithmetic unit 13 may be, for example, a microcomputer or a processor. The arithmetic unit 13 executes various processes such as communication processing, determination processing, or check mode processing based on the software stored in the storage unit 12.

[0024] The arithmetic unit 13 performs wireless communication with an external controller 6 via the communication antenna 11 according to various processes. The arithmetic unit 13 performs wired communication with the power supply unit 3 via the connection unit 9 and the wired transmission path 5 according to various processes. An example of the process executed by the arithmetic unit 13 will be described later using the flowchart of FIG. 2.

[0025] The arithmetic unit 13 includes a function of automatically determining different types of communication control modes (for example, communication control formats, communication specifications, communication methods). The arithmetic unit 13 determines the communication control mode based on, for example, at least one of the electrical connection state of a specific terminal (pin) in the connection unit 9 (the electrical connection state between the wireless module 2 and the power supply unit 3) or the communication state.

[0026] The arithmetic unit 13 has a plurality of different types of communication control modes for communication with the power supply unit 3. Since the arithmetic unit 13 can support a plurality of different types of communication control modes, the wireless module 2 can be applied to different types of power supply units 3 with a single unit. As a specific example, the arithmetic unit 13 can support any of an analog communication control mode, a single-channel digital communication control mode (serial communication), a two-channel digital communication control mode (serial communication), or a multi-channel digital communication control mode (serial communication).

[0027] The arithmetic unit 13 executes a check mode according to the state of the operation unit 7 such as a dip switch. For this reason, even in a state where there is no external controller 6 or in a situation where communication with the controller 6 is not possible, the arithmetic unit 13 can execute a test of the connection and operation of the wireless module 2, the power supply unit 3, and the lighting device 4. Specifically, when the check mode (or test mode) is executed, the arithmetic unit 13 performs control for lighting, extinguishing, blinking, dimming, color adjustment, etc. based on the check pattern stored in the storage unit 12. The operator can check the connection and operation of the wireless module 2, the power supply unit 3, and the lighting device 4 by checking the lighting device 4 that emits light according to the check mode. Thereby, the wiring from the wireless module 2 to the lighting device 4 can be checked without pairing between the controller 6 and the wireless module 2. By the arithmetic unit 13 executing the check mode, the workability of the operator at the work site can be improved, and the operator can perform inspections before setting up the lighting system 1.

[0028] The arithmetic unit 13 can set the area to which the lighting device 4 belongs according to the state of the operation unit 7 such as a dip switch. For this reason, even before the construction work or setup of the lighting system 1 is completed, or even in a state where power supply to the lighting system 1 is not possible, the operator can set an area in advance in the wireless module 2 by operating it. Thereby, the time required for setting the equipment and the area, which is necessary after the construction work, setup, or start of power supply to the lighting system 1, can be shortened, and the burden on the operator can be reduced.

[0029] The arithmetic unit 13 forcibly cancels the pairing (provisioning) executed from the controller 6 in response to an operation on the operation unit 7 such as pressing a push button switch. Generally, only the controller 6 that has performed the setting can execute the cancellation of the pairing. However, in the first embodiment, the operator manually operates the forced cancellation switch, and the arithmetic unit 13 cancels the pairing. As a result, when a failure or loss of the controller 6 occurs, or when the controller 6 and the wireless module 2 cannot communicate, the pairing between the wireless module 2 and the controller 6 can be cancelled, and a reset setup can be executed from the controller 6 or a new controller.

[0030] The arithmetic unit 13 may generate an illumination control signal based on, for example, the scene information stored in the storage unit 12, and transmit the illumination control signal to the power supply unit 3 via the connection unit 9 and the wired transmission path 5.

[0031] The power supply unit 3 receives power from an external power source and performs power conversion. The power supply unit 3 supplies the converted power to the lighting device 4. The power supply unit 3 is connected to the wireless module 2 via the wired transmission path 5. The power supply unit 3 transmits a signal to the wireless module 2 via the wired transmission path 5 and receives a signal from the wireless module 2 via the wired transmission path 5. The power supply unit 3 supplies the converted power to the wireless module 2 via the wired transmission path 5. The power supply unit 3 includes a connection unit 14, a storage unit 15, an operation unit 16, a processing unit 17, a power conversion unit 18, and a dimming unit (for example, a dimming circuit) 19. Note that in the power supply unit 3, the storage unit 15 or the operation unit 16 may be omitted.

[0032] The connection unit 14 can be connected to the other end of the wired transmission path 5. The connection unit 14 includes a plurality of terminals.

[0033] The storage unit 15 stores software such as, for example, data generated by the processing unit 17, data used by the processing unit 17, or programs used by the processing unit 17. The software stored in the storage unit 15 may include, for example, various setting values, data received from the wireless module 2, and the like. More specifically, the storage unit 15 stores, for example, a power source type code and a communication format.

[0034] The operation unit 16 includes, for example, buttons (e.g., push button switches) or switches (e.g., DIP switches). The operation unit 16 receives an operator's operation and transmits an operation signal indicating the content of the operator's operation to the processing unit 17. The operation unit 16 may include, for example, a check switch.

[0035] The processing unit 17 may be, for example, a microcomputer or a processor. The processing unit 17 executes a check mode based on the software stored in the storage unit 15 according to the specification of the operation unit 16. The check mode may execute abnormality detection processing and the like.

[0036] The processing unit 17 controls the power conversion unit 18 and the dimming unit 19 according to various processes, and communicates with the wireless module 2 via the connection unit 14 and the wired transmission path 5.

[0037] The power conversion unit 18 operates according to the control by the processing unit 17 and converts the power supplied from the power source. The power conversion unit 18 converts, for example, the voltage, current, and frequency of the current supplied from the power source into a predetermined voltage, current, and frequency. The power conversion unit 18 supplies the converted power to the storage unit 15, the operation unit 16, the processing unit 17, and the dimming unit 19. The power conversion unit 18 supplies the converted power to the lighting device 4 via the dimming unit 19 and to the wireless module 2 via the connection unit 14 and the wired transmission path 5.

[0038] The dimming unit 19 receives the power converted by the power conversion unit 18 and supplies power to the lighting device 4. Specifically, the dimming unit 19 converts the supplied DC power into a constant voltage or a constant current, or performs PWM control, and supplies it to the lighting device 4.

[0039] In the first embodiment, the case where a PWM signal, which is an analog signal, is supplied from the dimming unit 19 to the lighting device 4 will be described as an example. However, the analog signal may be a signal of other formats.

[0040] The lighting device 4 may be, for example, an LED. The lighting device 4 turns on or off according to the PWM signal received from the dimming unit 19 of the power supply unit 3.

[0041] In the first embodiment, the wireless module 2 automatically determines whether the communication executed between the wireless module 2 and the power supply unit 3 conforms to the analog communication control mode or the digital communication control mode. Further, when it is determined that the communication conforms to the digital communication control mode, the wireless module 2 automatically determines which digital communication control mode among a plurality of types of digital communication control modes it conforms to.

[0042] In the following description, the case where the analog communication control mode is the PWM communication mode will be described as an example. However, the analog communication mode may be other analog communication modes. Also, the case where the digital communication control mode is the serial communication mode will be described as an example. However, the digital communication control mode may be other communication modes such as, for example, the parallel communication mode.

[0043] Here, the relationship between the controller 6 and the wireless module 2 will be described. In the first embodiment, the lighting system 1 may include a plurality of wireless modules 2, and the controller 6 may perform wireless communication with the plurality of wireless modules 2. The wireless module 2 may execute different communications during and after pairing for wireless communication. More specifically, during pairing, the plurality of wireless modules 2 and the controller 6 are directly connected wirelessly, and after pairing, the set of paired wireless modules 2 are communicably connected to each other, and wireless communication may be performed using a plurality of communication transmission paths.

[0044] In general one-to-one communication or one-to-many communication, the radio wave reach distance is the distance of the direct wave. In such general one-to-one communication or one-to-many communication, the transmitting device and the receiving device are easily affected by the physical distance or radio wave attenuation. In contrast, in the lighting system 1 of the first embodiment in which a plurality of wireless modules 2 can communicate with each other as described above, a radio wave transmission path can be formed by the plurality of paired wireless modules 2. In other words, in the first embodiment, each of the plurality of wireless modules 2 can function not only as a repeater for communicating with the controller 6 but also as a repeater for other wireless modules.

[0045] FIG. 2 is a flowchart showing an example of processing executed by the wireless module 2 according to the first embodiment.

[0046] When power supply from the power supply unit 3 is started, the wireless module 2 shifts to the determination process of the power supply unit 3 to determine the type of the connected power supply. After startup, the wireless module 2 determines the communication mode, and then determines the state of the area setting switch. When the state of the area setting switch represents the check mode, the wireless module 2 transmits a check pattern corresponding to the check mode to the power supply unit 3.

[0047] In step S201, the arithmetic unit 13 determines whether a specific terminal of the wired transmission path 5 connected to the connection unit 9 functions as a mode select terminal in the PWM mode based on the state (e.g., voltage change) of the specific terminal. When the specific terminal functions as a mode select terminal, the arithmetic unit 13 determines that it is PWM on, and when the specific terminal does not function as a mode select terminal, the arithmetic unit 13 determines that it is PWM off. More specifically, the arithmetic unit 13 determines whether it is PWM on based on, for example, whether the voltage of the specific terminal is 0V or the supply voltage. This determination of the wireless module 2 can be easily realized even if the power supply unit 3 does not have a microcomputer. Therefore, the wireless module 2 can be connected to a power supply unit without a microcomputer.

[0048] In the case of PWM on (the state of the specific terminal of the wired transmission path 5 connected to the connection unit 9 corresponds to the state of the mode select terminal), in step S202, the arithmetic unit 13 starts up in the PWM communication control mode. After starting up in the PWM communication control mode, in step S203, the arithmetic unit 13 determines the state of the area setting switch included in the operation unit 7. The area setting switch can select an area. Also, the area setting switch can select a check mode (test mode). The area setting switch may be a dip switch that can specify a plurality of on / off states.

[0049] When the area setting switch is in a state of selecting the check mode (for example, when all of the plurality of dip switches are on), in step S204, the arithmetic unit 13 executes the check mode, and then the process returns to step S203.

[0050] When the area setting switch is in a state of selecting an area (for example, when any one of the plurality of dip switches is on and the other dip switches are off), in step S205, the arithmetic unit 13 cooperates with the power supply unit 3 to execute an operation in the PWM communication control mode regarding the area indicated by the area setting switch.

[0051] When PWM is off in the above S201, in step S206, the arithmetic unit 13 determines the type of digital communication control mode (data communication format) applied to the communication between the wireless module 2 and the power supply unit 3. For example, the arithmetic unit 13 transmits a signal based on the first digital communication control mode to the power supply unit 3. When the arithmetic unit 13 receives a normal response from the power supply unit 3, it selects the first digital communication control mode. When the arithmetic unit 13 does not receive a normal response from the power supply unit 3, it may select the second digital communication control mode. Alternatively, when the arithmetic unit 13 does not receive a normal response from the power supply unit 3, it transmits a signal based on the second digital communication control mode to the power supply unit 3, and when it receives a normal response from the power supply unit 3, it may select the second digital communication control mode.

[0052] When the first digital communication control mode is selected in the above step S206, in step S207, the arithmetic unit 13 starts up according to the first digital communication control mode. After starting up according to the first digital communication control mode, in step S208, the arithmetic unit 13 determines the state of the area setting switch included in the operation unit 7.

[0053] When the area setting switch selects the check mode in step S208, in step S209, the arithmetic unit 13 executes the check mode, and then the process returns to step S208.

[0054] When the area setting switch is in the state of selecting an area in step S208, in step S210, the arithmetic unit 13 executes an operation according to the first digital communication control mode regarding the area indicated by the area setting switch.

[0055] When the second digital communication control mode is selected in step S206 described above, in step S211, the arithmetic unit 13 starts up according to the second digital communication control mode. After starting up according to the second digital communication control mode, in step S212, the arithmetic unit 13 determines the state of the area setting switch included in the operation unit 7.

[0056] When the area setting switch selects the check mode in step S212, in step S213, the arithmetic unit 13 executes the check mode, and then the process returns to step S212.

[0057] When the area setting switch selects the area in step S212, in step S214, the arithmetic unit 13 executes the operation according to the second digital communication control mode for the area indicated by the area setting switch.

[0058] In FIG. 2 above, the determination in step S201 determines, for example, the state (voltage or potential) of the mode select terminal of the wired transmission path 5 connected to the connection portion 9 of the wireless module 2.

[0059] The determination in step S206 performs communication in a specific communication control mode and determines the communication control mode based on the reception state of the response.

[0060] The determinations in step S203, step S208, and step S212 electrically determine the state of the area setting switch.

[0061] The determination of the communication control mode in the first embodiment may be extended and added after step S206.

[0062] The arithmetic unit 13 stores the above various determination results or the type information of the communication control mode in the storage unit 12, and transmits the determination result or the type information to the controller 6 according to the request from the controller 6.

[0063] When shifting to the digital communication control mode, in accordance with the request received from the controller 6, the arithmetic unit 13 receives the power supply specific identification information from the power supply unit 3 via the wired transmission path 5 and the connection unit 9, stores the power supply specific identification information in the storage unit 12, and transmits the power supply specific identification information to the controller 6. When the storage unit 12 has already stored the power supply specific identification information, the arithmetic unit 13 may read out the power supply specific identification information stored in the storage unit 12 and transmit the read power supply specific identification information to the controller 6.

[0064] When the arithmetic unit 13 receives the area setting mode designation signal from the controller 6, in accordance with the area designated by this designation signal, the determination results of step S203, step S208, and step S212 may be forcibly switched, and the forcibly switched state may be stored in the storage unit 12. Thereby, the area setting can be remotely switched.

[0065] FIG. 3 is a diagram showing an example of the terminals of the wired transmission path 5 when the arithmetic unit 13 determines that it is in the PWM communication control mode in the first embodiment.

[0066] The arithmetic unit 13 and the processing unit 17 determine the roles of the terminals of the wired transmission path 5 as shown in FIG. 3.

[0067] FIG. 4 is a diagram showing an example of the terminals of the wired transmission path when the arithmetic unit 13 determines that it is in the digital communication control mode in the first embodiment.

[0068] The arithmetic unit 13 and the processing unit 17 determine the roles of the terminals of the wired transmission path 5 as shown in FIG. 4.

[0069] In the first embodiment described above, the lighting system 1 can be constructed using the wireless module 2 applicable to a plurality of types of communication control modes with one unit. In the first embodiment, various types of power supply units 3 can be connected to the wireless module 2.

[0070] In the first embodiment, the wireless module 2 automatically determines the communication control mode of the power supply unit 3 based on the change in the terminal voltage and the inability to communicate, and switches the communication control mode. As a result, the construction of the lighting system 1 can be labor-saving and shortened.

[0071] In the first embodiment, even before the lighting system 1 becomes operable, in a state where the controller 6 is absent, in a state where the controller 6 and the wireless module 2 cannot communicate, or even before the lighting system 1 is set up, the area of the lighting device 4 can be set by operating the operation unit 7 of the wireless module 2.

[0072] In the first embodiment, by executing the check mode in the wireless module 2, even before the lighting system 1 becomes operable, in a state where the controller 6 is absent, in a state where the controller 6 and the wireless module 2 cannot communicate, or even before the lighting system 1 is set up, the operator can check the lighting, extinguishing, blinking, dimming, and color adjustment states of the lighting device 4. As a result, the operator can proceed with the checking work while constructing the lighting system 1, improving the work efficiency and the reliability of the lighting system 1. Also, in the first embodiment, the wiring of the lighting device 4 can be checked without pairing. In addition, the workability of the operator at the site can be improved, and the wiring can be checked before setup.

[0073] In the first embodiment, the wireless module 2 is provided with an operation unit 7 such as a DIP switch or a push button switch. By operating the operation unit 7, area setting and forced release of pairing can be performed. Also, using the controller 6, area setting and establishment or release of pairing can be performed. For example, when controlling the pairing and area setting for a large number of lighting devices 4 with the controller 6, it was necessary to display a large number of appliances on the screen of the controller 6 and sort them. However, in the first embodiment, since the individual wireless module 2 side can give instructions regarding pairing and perform area setting, there is no need to display a large number of appliances on the controller 6 and give area setting and pairing instructions. Therefore, the operator can easily and efficiently distribute the devices during pairing.

[0074] Generally, in pairing by the controller 6, a plurality of powered-on wireless modules 2 are searched simultaneously. The operator needs to classify the plurality of simultaneously searched wireless modules 2 and perform the work of dividing them into areas with the controller 6. However, in the lighting system 1 according to the first embodiment, the work of the operator can be reduced by presetting the area setting switch of the wireless module 2 before pairing.

[0075] In the first embodiment, the power supply unit 3 may be a wireless-compatible lighting fixture. In this case, the lighting fixture may be provided with various detection circuits. Examples of the various detection circuits include a secondary side overcurrent, abnormal temperature, and circuit failure detection circuits. When the detection circuit detects an abnormality, the processing unit 17 performs processing of the abnormality code. The processing unit 17 transmits the abnormality code to the wireless module 2 via the connection unit 14 and the wired transmission path 5.

[0076] [Second Embodiment] The second embodiment is a modification of the above first embodiment, and a lighting system including a power box (wireless dimmer) will be described instead of the wireless module 2 and the power supply unit 3 according to the first embodiment.

[0077] In the second embodiment, by combining a power box with a lighting device and a dimming device that do not have a wireless function, the lighting device and the dimming device are incorporated into a lighting system having a wireless function.

[0078] FIG. 5 is a block diagram showing an example of the configuration of a lighting system 20 according to the second embodiment. In this FIG. 5, the dimming device 21 and the lighting device 4 may be collectively regarded as constituting a dimmable lighting fixture. Examples of the dimming method of the dimmable lighting fixture include a phase control type, a PWM control type, a PWM dimming and color mixing type, a DALI control type, and the like. The dimming device 21 may be, for example, a dimmable separate power supply. A power box 22 adapted to the dimming method of the dimmable lighting fixture is connected to the dimmable lighting fixture. The wiring between the dimmable lighting fixture and the power box 22 is different depending on the dimming method. Therefore, the operator needs to connect the dimmable lighting fixture and the power box 22 with wiring adapted to the dimming method. In the second embodiment, in electrical work, destruction of the power box 22 is prevented even if there is an error in the wiring between the dimmable lighting fixture and the power box 22.

[0079] The dimming device 21 receives power supply from the power box 22. Further, the dimming device 21 receives a dimming signal from the power box 22 and controls the lighting device 4 according to the received dimming signal. The dimming signal may be, for example, a PWM signal or the like. In the second embodiment, it is assumed that the dimming device 21 does not have a wireless communication function.

[0080] The dimming device 21 and the power box 22 are connected by a PWM signal line 23.

[0081] The power box 22 corresponds to a wireless dimmer. The power box 22 is connected to the lighting device 4 via the PWM signal line 23 and the lighting fixture 21 without a wireless function. The power box 22 is a device for interlocking the lighting fixture 21 and the lighting device 4 with the controller 6 that performs wireless communication. The power box 22 performs dimming, for example, by a phase dimming method, a PWM dimming method (single color or dimming and color adjustment), or an on / off method. In the second embodiment, the PWM dimming method will be described as an example.

[0082] The power box 22 includes a wireless module 2 and a dimming unit 24.

[0083] The dimming unit 24 receives power from an external power source and performs power conversion. The dimming unit 24 supplies the converted power to the lighting fixture 21. The dimming unit 24 receives a signal from the controller 6 via the wireless module 2 and the wired transmission path 5, generates a dimming signal according to the received signal, and transmits the dimming signal to the lighting fixture 21. The dimming unit 24 transmits a signal via the wired transmission path 5 and the wireless module 2. The dimming unit 24 supplies the converted power to the wireless module 2 via the wired transmission path 5. The dimming unit 24 includes a connection part 14, an operation part 16, a display part 25, a storage part 15, a processing part 26, a power conversion part 18, a dimming part (for example, a dimming circuit) 27, and an abnormality detection part (for example, an abnormality detection circuit) 28. Note that the processing part 26 and the dimming part 27 may be combined as one component. The processing part 26 and the abnormality detection part 28 may be combined as one component. Other components may also be combined as appropriate.

[0084] The processing part 26 controls the operation part 16, the display part 25, the power conversion part 18, the dimming part 27, and the abnormality detection part 28 according to various processes, and communicates with the wireless module 2 via the connection part 14 and the wired transmission path 5.

[0085] In the second embodiment, the processing unit 26 executes a check mode according to the operation state of the operation unit 16 (for example, the state of the check switch). The processing unit 26 may activate the check mode alone, may detect an abnormality in cooperation with the abnormality detection unit 28 in the check mode, or may cooperate with the check mode of the wireless module 2. By operating the processing unit 26 in the check mode, an operator can perform wiring checks such as the PWM signal line 23 and various operation confirmations.

[0086] The dimming unit 27 receives the power converted by the power conversion unit 18. The dimming unit 27 generates a dimming signal (PWM signal) based on the control of the processing unit 26 and transmits the generated dimming signal to the dimming device 21. The dimming unit 27 performs power supply control according to the dimming method.

[0087] The abnormality detection unit 28 executes an abnormality detection process in cooperation with the processing unit 26. When an abnormality is detected, the abnormality detection unit 28 prevents the occurrence of a failure of the power box 22 by stopping the operation of the power box 22 and protects the power box 22. The abnormality detection unit 28 may be, for example, a PWM wiring protection circuit. The abnormality detection unit 28 may always operate during the energization of the power box 22 to detect an abnormality. When an abnormality occurs, the processing unit 26 may stop the output of the power box 22 and transmit abnormality information to the controller 6 via the wired transmission path 5 and the wireless module 2.

[0088] The abnormality detection process executed by the cooperation of the abnormality detection unit 28 and the processing unit 26 will be described below.

[0089] For example, in a conventional dimmer that requires PWM wiring for dimming, a circuit failure or circuit destruction of a circuit that outputs a signal may occur due to incorrect wiring or a short circuit of the wiring. In order to prevent such a failure or destruction, a conventional dimmer uses a fuse or a similar protection element to prevent a circuit failure or destruction.

[0090] For example, in a method of preventing circuit failure or destruction using a general protection fuse, when restoring, it is necessary to physically replace the fuse. When the fuse is of the self - reset type, if the short - circuit state continues, the interruption and restoration will be repeated, resulting in a physical failure and the need to replace the self - reset type fuse. When the self - reset type fuse is of the board - mounted type, it may be necessary to replace the board body.

[0091] To address such problems, in the second embodiment, an abnormality detection unit 28 is used to detect abnormalities. More specifically, the dimming unit 24 according to the second embodiment performs abnormality detection such as a short - circuit of the PWM signal line 23. The abnormality detection unit 28 includes, for example, a polyswitch. The polyswitch has a resistance that increases when it gets hot and finally cuts off the circuit. In the second embodiment, for example, one end of the polyswitch is connected to one end of the signal line to be monitored, and the other end of the polyswitch is connected to the other end. The abnormality detection unit 28 transmits a voltage signal indicating the voltage generated at both ends of the polyswitch to the processing unit 26. The processing unit 26 receives the voltage signal from the abnormality detection unit 28 and detects an abnormality based on, for example, the amount of change in voltage per unit time. When the processing unit 26 detects an abnormality, it stops the operation or output of the circuit to be monitored by the abnormality detection unit 28. Thereby, the failure or destruction of the power box 22 can be significantly reduced, and the occurrence of circuit replacement and the like can be prevented.

[0092] In the second embodiment, for example, even if the PWM signal line 23 or the circuit to be monitored is short - circuited, the protection function works, so that the power box 22 can be prevented from failing, and if the cause of the abnormality is eliminated, the lighting device 4 can be relit.

[0093] When the processing unit 26 detects an abnormality, it transmits the abnormality information to the controller 6 via the connection unit 14, the wired transmission path 5, and the wireless module 2. The controller 6 uses application software to display the abnormality information. Thereby, the operator can confirm the abnormality detected by the power box 22.

[0094] In the second embodiment described above, by combining the power box 22 with the lighting device 4 and the dimming device 21 that do not have a wireless function, the lighting device 4 and the dimming device 21 can be incorporated into the lighting system 20 having a wireless function.

[0095] In the second embodiment, before the setup of the lighting system 20 is completed, the power box 22 executes a check mode, and it is possible to perform an operation check and a wiring check by the operation confirmation and abnormality detection unit 28 and the processing unit 26 even before the setup of the lighting system 20.

[0096] In the second embodiment, the processing unit 26 and the abnormality detection unit 28 cooperate to detect an abnormality. When an abnormality is detected, the operation or output of the circuit to be monitored by the abnormality detection unit 28 is stopped. Thereby, the failure or destruction of the power box 22 can be significantly reduced, and the occurrence of circuit replacement or the like can be prevented.

[0097] In the second embodiment, when an abnormality of the power box 22 is detected, the controller 6 displays the abnormality information. Thereby, the operator can confirm the abnormality that has occurred in the power box 22.

[0098] The dimming device 21 and the lighting device 4 according to the second embodiment are not compatible with wireless communication and do not have an abnormality detection function. However, by connecting the power box 22 according to the second embodiment to the dimming device 21, wireless communication and abnormality detection become possible, and the safety of the operation of the lighting system 20 can be ensured.

[0099] The power box 22 according to the second embodiment may transmit the abnormality information to the controller 6 via the system gateway and the Internet. Thereby, the lighting system 20 can be monitored from an external controller 6.

[0100] The power box 22 according to the second embodiment includes an operation unit 16. Conventionally, in order to check the lighting of the lighting device 4 and the dimming device 21, it was necessary to wire on-site and pair with the controller 6. In contrast, in the second embodiment, an operator can turn on / off the lighting using the operation unit 16 provided in the power box 22, and can perform wiring confirmation in the check mode without pairing. As a result, the workability of the operator on-site can be improved, and wiring confirmation can be performed before setup.

[0101] [Third Embodiment] The third embodiment is a modification of the power box 22 described in the second embodiment.

[0102] FIG. 6 is a block diagram showing an example of the configuration of the power box according to the third embodiment. In the power box 22 of FIG. 6, only the parts described in the third embodiment among the components of the power box 22 of FIG. 5 are shown, and other parts are omitted.

[0103] The power box 22 according to the third embodiment has two PWM output systems 23A and 23B. The power box 22 transmits a PWM signal to the dimming device 21 through the two PWM output systems 23A and 23B.

[0104] The power box 22 according to the third embodiment includes a microcomputer 32, abnormality detection units 34A and 34B, and resistors 35A and 35B.

[0105] The microcomputer 32 includes a PWM dimming signal circuit 33A corresponding to the PWM output system 23A and a PWM dimming signal circuit 33B corresponding to the PWM output system 23B. The PWM dimming signal circuits 33A and 33B generate a PWM signal and transmit the generated PWM signal to the dimming device 21 via the PWM output systems 23A and 23B.

[0106] The microcomputer 32 monitors the PWM signal (voltage) output from the PWM dimming signal circuit 33A to the PWM output system 23A, and further monitors the PWM signal output from the PWM dimming signal circuit 33B to the PWM output system 23B. The microcomputer 32 functions as the processing unit 26 and the dimming unit 27 in FIG. 5. When the microcomputer 32 starts up and is in the energized state, it starts abnormal detection.

[0107] Each of the abnormality detection units 34A and 34B is connected in series with each of the PWM dimming signal circuits 33A and 33B, and monitors, for example, the voltage at the resistor or the poly switch terminal.

[0108] Each of the abnormality detection units 34A and 34B outputs the measured value (for example, the actually measured value or the captured value) of the voltage of the PWM signal to the microcomputer 32 via the resistors 35A and 35B.

[0109] The microcomputer 32 compares the theoretical value with the measured value, and detects an abnormality when the difference exceeds a predetermined range.

[0110] Generally, a PWM signal for lighting control (for example, a dimming signal) has a pulse waveform with a frequency of 1 kHz at a voltage of about DC12V. It is DC12V during the light-off signal. When the dimming level represented by the PWM signal is increased (brightened), the off period in the waveform of the PWM signal becomes longer. Thus, if the off period becomes longer, it becomes weaker when converted to voltage. Also, there may be cases where an increase in current sufficient to operate the poly switch cannot be expected. For this reason, it is difficult to detect an abnormality in a PWM signal with a long off period.

[0111] However, in the third embodiment, since the microcomputer 32 compares the theoretical value with the measured value and performs abnormality detection, it is possible to perform abnormality detection even when the value (for example, the dimming level) obtained by converting the PWM signal to voltage is weak.

[0112] FIG. 7 is a graph showing an example of the relationship between the voltage of the PWM signal and the average voltage. PWM is called pulse width modulation. In PWM, the average voltage is controlled by changing the width (Tp) of the pulses generated at regular intervals (T). For example, when the on-period of the waveform is long, the lighting device 4 emits light dimly, and when the on-period is short, it emits light brightly. The power box 22 performs output control of such a PWM signal. The power box 22 according to the third embodiment performs analog-to-digital conversion of the PWM signal by an AD conversion circuit and feeds it back to the microcomputer 32 in the process of abnormality detection. Then, the power box 22 detects an abnormality when the time during which the difference between the theoretical value and the measured value of the output PWM signal is outside a predetermined range is equal to or longer than a predetermined period.

[0113] In the third embodiment described above, the power box 22 has two PWM output systems 23A and 23B, and abnormality detection units 34A and 34B are provided for each of the two PWM output systems 23A and 23B. The microcomputer 32 compares the theoretical value with the measured value to detect abnormalities in the two PWM output systems 23A and 23B. Thereby, abnormalities can be detected regardless of the dimming level indicated by the PWM dimming signal.

[0114] [Fourth Embodiment] The fourth embodiment is a modification of the wireless module according to the first or second embodiment.

[0115] FIG. 8 is a block diagram showing an example of the configuration of the wireless module 29 according to the fourth embodiment.

[0116] The wireless module 29 includes a first connection part 91, a second connection part 92, an operation part 7, a display part 8, and a communication module 30. The communication module 30 includes a communication antenna (wireless antenna) 11, a storage part 12, and an arithmetic part 31.

[0117] In the fourth embodiment, the wireless module 29 includes a plurality of power input terminals, that is, a first connection portion 91 and a second connection portion 92, so that it can be used even with different supply voltages. The arithmetic unit 31 switches its operation according to the connection portion being used among the first connection portion 91 and the second connection portion 92.

[0118] Thereby, the wireless module 29 can be used for a power supply with a first supply voltage such as a DC 3.3V system, and can also be used for a power supply with a second supply voltage such as DC 5 to 18V.

[0119] [Fifth Embodiment] In the fifth embodiment, the relationship between the information stored in the wireless modules 2 and 29 and a controller (hereinafter referred to as a slave controller) used as a lower-level (slave unit) of the controller 6 will be described. In the following description, the wireless modules 2 and 1 and the lighting system 1 will be described as representatives, but the same applies to the wireless module 29 and the lighting system 20.

[0120] The lighting system 1 reproduces a scene by one or more lighting devices 4. The lighting system 1 may be capable of realizing two types of changes, that is, a first change and a second change to a standard scene, in order to improve the convenience for operators and users.

[0121] The first change is, for example, a mode including departure from a standard scene, temporary change, and return to the standard scene. The second change is, for example, a mode for finely adjusting a standard scene.

[0122] The first change and the second change are common in that, for example, both change the standard scene based on an operation by an operator or a user on the slave controller. However, the first change and the second change differ in that they have different priorities regarding the change.

[0123] In order to prioritize change operations for the slave controller, the lighting system 1 includes a plurality of types of slave controllers and stores various information in the storage unit 12 of the wireless module 2. The wireless module 2 executes processing based on the information in the storage unit 12.

[0124] As a specific example, the storage unit 12 of the wireless module 2 stores, for example, network information, unique identification information of the wireless module 2, facility information (including facility identification information), area information (area identification information), group information (including group identification information), at least one piece of scene information (e.g., including scene level, fade time information), change information (e.g., private mode level or user priority mode level), change return scene information (e.g., private mode return scene level), temporary change information (temporary change level), and final state information (current state level for power failure recovery). In the fifth embodiment, the facility is the target for introducing the lighting system 1. The facility is divided into a plurality of areas. The facility may be, for example, one floor of a building. Each individual area is further divided into at least one group. At least one wireless module 2 belongs to each individual group.

[0125] The network information may include a network code (e.g., a mesh network key) assigned during pairing by the operation of the controller 6. The network information may include login key information for functioning in the same network.

[0126] The unique identification information, facility information, area information, group information, and scene information are information used in the standard operation and communication of the lighting system 1. The unique identification information, facility information, area information, group information, and scene information are set by the controller 6, transmitted from the controller 6 to the wireless module 2, and stored in the storage unit 12 of the wireless module 2.

[0127] The change information and the change return scene information are generated by an operator or a user using a first slave controller capable of wireless communication with the wireless module 2, transmitted from the first slave controller to the wireless module 2, and stored in the storage unit 12 of the wireless module 2. The change information and the change return scene information are used to realize the above-described first change (departure from the standard scene, temporary change, return to the standard scene), or the above-described second change (fine adjustment of the standard scene).

[0128] The first slave controller may be referred to as, for example, a private remote controller. By using the private remote controller, an operator or a user can operate the brightness and color of the lighting device 4 belonging to a specific area or a specific group without using the controller 6. For example, an operator or a user can brighten the lighting device 4 above himself / herself without changing the entire scene. Also, for example, an operator or a user can turn off only a specific group during a meeting or the like.

[0129] The change information is, for example, a value changed when leaving the scene by a private remote controller. The transition to the scene corresponding to the change information and the change return scene information is performed by an operator or a user operating a private remote controller preset by the controller 6.

[0130] The change information may include, for example, values related to the brightness and color changed and adjusted by an operator or a user operating a private remote controller.

[0131] The change information shall be the high-priority scene information (including brightness and color levels) set by the operator or user using the private remote controller. When the controller 6 or the scene switch calls the change information stored in the storage unit 12 of the wireless module 2, the wireless module 2 executes processing to leave the currently playing scene and play the scene corresponding to the change information. Since the priority of the mode for playing the scene corresponding to this change information is high, during the playback of the scene corresponding to the change information, the playback of the scene of the change information set by this operator or user is maintained. Even if the wireless module 2 receives a scene change instruction from the controller 6, the scene switch, or the schedule timer, the wireless module 2 prioritizes the scene of the change information and maintains the scene of the change information, and does not reflect the scene change instruction received from the controller 6, the scene switch, or the schedule timer until it receives a scene return instruction or a forced return instruction from the controller 6. Then, the wireless module 2 stores the content of the scene change instruction received from the controller 6, the scene switch, or the schedule timer in the storage unit 12 as change return scene information. Since the wireless module 2 receives instructions from an external timer (such as the controller 6 or the gateway), it is not necessary for the wireless module 2 to have a timer function, the configuration of the wireless module 2 can be simplified, and an increase in cost can be prevented even if the number of wireless modules 2 increases.

[0132] The change return scene information includes the values of the scene (such as brightness or color) when returning from the state of playing the scene corresponding to the change information. The wireless module 2 does not call this change return scene information until it receives a scene return instruction based on the operation of the operator or user or a forced return instruction from the controller 6. When the wireless module 2 receives a scene return instruction or a forced return instruction, it calls the change return scene information and executes processing to play the scene corresponding to the change return scene information.

[0133] In the fifth embodiment, the change information and the change return scene information have a paired relationship. The wireless module 2 manages at any time in the storage unit 12 the change return scene information having the scene number and level information at the time of return.

[0134] When scene reproduction is executed based on specific scene information for a specific area, the wireless module 2 can, for example, use the change information to cause a specific group belonging to this specific area to leave the scene. In a situation where scene departure has occurred, for example, it is assumed that a transition from first scene information (for example, night scene information) to second scene information (for example, morning scene information) has occurred for a specific area. In this case, the wireless module 2 also causes the change return scene information to transition from the first scene information to the second scene information. The wireless module 2 calls and reproduces the change return scene information corresponding to the second scene information at the time of return, thereby performing scene reproduction that is consistent with other wireless modules belonging to the same area. Thereby, even when time has passed and the applicable scene information has changed, an appropriate scene can be reproduced.

[0135] The private remote controller transmits a command to the wireless module 2. This command has a configuration including, for example, designation of a facility, designation of an area, designation of a group, a value indicating the intensity of light, a value indicating the brightness of light, and the like. The private remote controller stores, for example, network information, unique identification information of the wireless module 2, facility information, area information, and group information. The network information, unique identification information of the wireless module 2, facility information, area information, and group information stored in the private remote controller are set by the controller 6, for example, and transmitted from the controller 6 to the private remote controller.

[0136] In the lighting system 1, distributed processing is implemented to disperse the risk of system destruction or failure and to secure the wireless communication band. For this purpose, the private remote controller mainly sends commands to the wireless module 2. Many of the various operations and processes are executed by the individual wireless modules 2. Examples of commands include a command to brighten the lighting, a command to dim the lighting, a command to change the color temperature, an on / off command, a scene departure command, and a scene return command.

[0137] Even if an operator or user changes a scene using the private remote controller, the standard scene information is stored in the wireless module 2. For this reason, the operator or user can freely change the scene and then easily restore the scene. Also, the private remote controller may have fewer functions than the controller 6, and the operator or user can use the intuitive interface of the private remote controller.

[0138] The temporary change information stored in the storage unit 12 of the wireless module 2 is set by the controller 6 or a scene switch (e.g., a wall scene switch), transmitted from the controller 6 or the scene switch to the wireless module 2, and stored in the storage unit 12 of the wireless module 2. The temporary change information includes, for example, a temporarily changed scene level.

[0139] The transition to the mode of reproducing the scene based on the temporary change information is performed by the operator or user operating the controller 6 or the scene switch.

[0140] The scene switch is connected to, for example, a gateway that relays communication between the controller 6 and the wireless module 2. In this case, the gateway performs wireless communication with the wireless module 2, for example. The gateway has a timer function, and an operator or user may be able to turn on / off the timer function of the gateway using the scene switch. By using the scene switch, the operator or user can call a scene, switch scenes, temporarily change the brightness, temporarily change the color temperature, start a schedule, and cancel a schedule without using the controller 6.

[0141] When the controller 6 or the scene switch calls the temporary change information stored in the storage unit 12 of the wireless module 2, all the wireless modules 2 belonging to the area temporarily change the scene, for example, based on the scene information being played and the temporary change information. This temporary change of the scene may have a lower priority than, for example, the change of the scene based on the above change information. Since the temporary change of the scene based on the temporary change information has a low priority, when another scene information is called by an operator's or user's operation or by a timer, the wireless module 2 may discard the temporary change information and start playing the scene corresponding to the other scene information.

[0142] During scene playback, the operator or user operates the up button or down button of the scene switch to change the brightness, color temperature, etc. of the scene. The scene switch transmits a temporary change command to all the wireless modules 2 belonging to a specific area of a specific facility via the gateway, for example. Since the priority of this temporary change is low, after the wireless module 2 executes the temporary change of the scene, when it receives another command from the controller 6 or the scene switch via the gateway, it discards the temporary change and transitions to the scene according to the received other command.

[0143] In the fifth embodiment, the gateway has a timer function and may invalidate the temporary change of the wireless module 2 at a predetermined time.

[0144] The scene switch sends a command to the wireless module 2 via the gateway. This command is configured to include, for example, the designation of a facility, the designation of all groups belonging to a specific area, a value indicating the intensity of light, a value indicating the brightness of light, and the like. The scene switch stores, for example, network information, unique identification information of the wireless module 2, facility information, area information, and group information. The network information, unique identification information of the wireless module, facility information, area information, and group information stored by the scene switch are set by, for example, the controller 6 and transmitted from the controller 6 to the scene switch.

[0145] Even if an operator or user changes the scene using the scene switch, the standard scene information is stored in the wireless module 2. Therefore, the operator or user can freely change the scene and then easily restore the scene. Also, the scene switch may have fewer functions than the controller 6, and the operator or user can use a sensory interface.

[0146] The final state information represents the latest scene information when the power supply to the lighting system 1 is stopped (for example, in the case of a power outage). When the power supply is resumed, the wireless module 2 reads the final state information from the storage unit 12 and reproduces the scene corresponding to the final state information. Thereby, the wireless module 2 can reproduce the scene immediately before the power supply is stopped.

[0147] In the fifth embodiment described above, various types of information set by the controller 6 are stored in the storage unit 12 of the wireless module 2. The wireless module 2 executes processing according to the stored content of the storage unit 12 in accordance with commands received from the controller 6, the slave controller, the gateway, and the like.

[0148] In the fifth embodiment, the commands transmitted by the timer functions of the controller 6, the slave controller, and the gateway have a simple data structure. As a result, a mesh network can be constructed by a plurality of wireless modules 2, the network load can be reduced, and the response can be speeded up. Further, in the fifth embodiment, in order to secure the network bandwidth, transmission and reception of responses may be omitted for specific commands that do not require responses. In the fifth embodiment, responses can be omitted according to the type of command. However, when the controller 6 transmits setting information to the wireless module 12, the controller 6 may receive a response from the wireless module 2 indicating that the setting information has been normally received.

[0149] In the fifth embodiment, in order to ensure the stability and reliability of communication, a plurality of wireless modules 2 provided in the lighting system 1 may be capable of communicating with each other and performing repeat communication of commands.

[0150] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. The present embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalent scope.

Explanation of Reference Numerals

[0151] 1, 20... Lighting system, 2, 29... Wireless module, 3... Power supply unit, 4... Lighting device, 5... Wired transmission path, 6... Controller, 7, 16... Operation unit, 8, 25... Display unit, 9, 14... Connection unit, 10, 30... Communication module, 11... Communication antenna, 12, 15... Storage unit, 13, 31... Arithmetic unit, 17, 26... Processing unit, 18... Power conversion unit, 19, 27... Dimming unit, 21... Dimming device, 22... Power box, 23... PWM signal line, 24... Dimming unit, 28... Abnormality detection unit

Claims

1. A microcomputer including a first PWM (Pulse Width Modulation) dimming signal circuit that transmits a first PWM signal, the time change of which has a pulse waveform of voltage, via a first PWM output system to a dimmer connected to a lighting device, and a second PWM dimming signal circuit that transmits a second PWM signal, the time change of which has a pulse waveform of voltage, via a second PWM output system to the dimmer; a first abnormality detection unit connected in series with the first PWM dimming signal circuit and configured to output a first voltage measurement value to the microcomputer; a second abnormality detection unit connected in series with the second PWM dimming signal circuit and configured to output a second voltage measurement value to the microcomputer; Equipped with The microcomputer detecting an abnormality when a time during which a difference between the first voltage measurement value and a theoretical value of the first PWM signal falls outside a predetermined range is equal to or longer than a predetermined period of time; detecting an abnormality when a time during which a difference between the second voltage measurement value and a theoretical value of the second PWM signal is outside a predetermined range is equal to or longer than a predetermined period of time; If an abnormality is detected, operation will be stopped. Dimmer.

2. The dimmer is non-wireless; The dimmer of claim 1 , further comprising a wireless module connected to the microcomputer for wirelessly communicating with an external controller.

3. When the microcomputer is started and turned on, it starts detecting an abnormality. The dimmer of claim 1.

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