JP2012069398A - Dimming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimming device capable of avoiding to be used in a state that an overcurrent can flow in a switch element due to incorrect wiring or the like and suppressing the number of components from increasing as much as possible.SOLUTION: A control circuit 48 comprises: a dimming control unit 481 which controls on/off of switch elements of dimming circuits 11 to 15; a determination unit 482 which determines as abnormal when a load current detected by a current detection unit 41 becomes greater than or equal to a specified value; and a mode switching unit 483 which switches the operation mode of the dimming control unit 481. The dimming control unit 481 has two operation modes: a normal mode which dims and lights lighting fixtures 31 to 35 and an inspection mode which sequentially selects the dimming circuits to be inspected from the plurality of dimming circuits 11 to 15 and continuously turns on the switch elements of the selected dimming circuits for a prescribed time. If the inspection mode is selected in the mode switching unit 483, the determination unit 482 determines whether or not it is abnormal by comparing a value detected by the current detection unit 41 with the specified value and displays the determination result in a display unit 45.

Description

  The present invention relates to a light control device including a plurality of light control circuits that control and light individual lighting loads.

  Conventionally, as this type of dimming device, each dimming circuit (dimming unit) drives a switching element such as a thyristor inserted in a power supply path from an AC power source to the lighting load by high-frequency switching, thereby controlling the lighting load. An apparatus for dimming and lighting is known (see, for example, Patent Document 1). In the dimming device described in Patent Document 1, in each dimming circuit, the amount of electric power supplied to the illumination load (lamp) per unit time is adjusted by a phase control method that adjusts the conduction angle (phase angle) of each switch element. The lighting load is dimmed by adjusting.

  In the light control device described in Patent Document 1, each light control circuit includes a current detector that detects a current flowing through the switch element, and a detection value of the current detector within a predetermined time after the switch element is activated. And a control device for turning off the switch element when the threshold value is reached. Thereby, even if the switch element is driven when the illumination load is in a cold state and the illumination load is low impedance, the dimmer can protect the switch element from the rush current generated at this time.

JP-A-11-233277

  By the way, in the dimming device provided with a plurality of dimming circuits, the lighting load connected to the dimming circuit becomes a heavy load due to incorrect wiring when the installer connects the lighting load to each dimming circuit. When the switch element is turned on, an overcurrent may flow through the switch element. For example, when a plurality of lighting loads that should be connected to separate dimming circuits are connected in parallel to the output terminals of one dimming circuit, the impedance between the output terminals of the dimming circuits is low. Thus, an overcurrent may flow through the switch element during the operation of the dimming circuit.

  However, the dimmer of Patent Document 1 protects the switch element from the rush current when the lighting load is actually dimmed, and the overcurrent can flow to the switch element due to miswiring or the like. There is no function to determine whether or not there is. That is, since the current flowing through the switch element during dimming lighting varies depending on the dimming rate, the dimming device of Patent Document 1 has a low dimming rate (even if the dimming is heavy) due to miswiring. The current flowing in the switch element of the (deep) dimming circuit may be less than the threshold value. As a result, the user is unaware of miswiring and may continue to use the light control device in a state where an overcurrent can flow through the switch element due to miswiring, which may lead to breakage of the switch element.

  Further, in the dimming device, even when a plurality of dimming circuits are operated simultaneously, it is determined which dimming circuit switch element has reached the threshold value, and each switch element is individually Therefore, a current detector and a control device are required for each dimming circuit. Therefore, there is a problem that as the number of dimming circuits increases, the number of current detectors and control devices provided in the dimming device also increases, leading to an increase in the number of components as the entire dimming device.

  The present invention has been made in view of the above reasons, and it is possible to avoid a dimming device that can avoid being used in a state where an overcurrent can flow to the switch element due to miswiring and the like, and can suppress an increase in the number of components as much as possible. The purpose is to provide.

  The light control device of the present invention includes a switch element that is inserted into a power supply path from a power source to a lighting load, and controls the power supplied to the lighting load by switching control of the switch element to dimm and light the lighting load. A plurality of optical circuits and a current detection unit that detects the magnitude of the load current supplied from the power source to each lighting load via each dimming circuit, and outputs a control signal to the dimming circuit to turn on / off the switch element The dimming control unit, the operation mode of the dimming control unit, the normal mode in which the lighting load is dimmed and the dimming circuit to be inspected are sequentially selected from among the plurality of dimming circuits. A mode switching unit that switches between an inspection mode that outputs a control signal that continuously turns on the switch element for a predetermined time, and an abnormality if the detection value of the current detection unit is not within a predetermined normal range in the inspection mode. A determination unit for disconnection, characterized in that it comprises a notification unit for notifying the determination result of the determination unit.

  In this dimming device, the determination unit has a predetermined value for determining the normal range set in advance. In the inspection mode, the detection value of the current detection unit is compared with the predetermined value, and the detection value is equal to or higher than the predetermined value. It is desirable to judge it as abnormal.

  In this light control apparatus, it is more preferable that the notification unit includes a display unit that performs display for specifying the inspection target when the determination unit determines that the abnormality is present from the plurality of light control circuits.

  In this light control device, an inspection switch that receives an operation input from the user is provided, and it is more preferable that the mode switching unit switches from the normal mode to the inspection mode in accordance with the operation input of the inspection switch.

  The light control device further includes a light blocking circuit inserted between the power source and the light control circuit for each light control circuit, and the light blocking device separates the inspection target from the power supply when the determination unit determines that the abnormality is present. Is more desirable.

  The present invention is advantageous in that it can be prevented from being used in a state where an overcurrent can flow to the switch element due to erroneous wiring or the like, and an increase in the number of components can be suppressed as much as possible.

It is a schematic block diagram which shows the structure of the light modulation apparatus which concerns on embodiment. It is a front view which shows the external appearance of a light control apparatus same as the above. It is a schematic circuit diagram which shows the principal part of a light modulation apparatus same as the above.

  The light control device of the present embodiment is a device that performs light control lighting of a plurality of systems of illumination loads (lighting fixtures) that are appropriately installed at various locations in a room such as a ceiling, a wall, and a floor at a desired light control rate. This light control device can produce lighting according to a living scene by simultaneously lighting a plurality of illumination loads at a desired light control rate. In addition, the lighting load of each system may be one lighting fixture, or may be a plurality of lighting fixtures connected in series or in parallel.

  As shown in FIG. 1, the dimming device 1 performs dimming and lighting of the lighting load by performing phase control of the load current supplied to the lighting load, and a dimming signal to the lighting load. A plurality of signal output circuits 21 to 25 (5 circuits in this case) are provided. Hereinafter, when each of the dimming circuits 11 to 15 is not particularly distinguished, the dimming circuits 11 to 15 are collectively referred to as “the dimming circuit 10”, and when each of the signal output circuits 21 to 25 is not particularly distinguished, they are collectively referred to as the “signal output circuit 20”. Call it.

  Here, the illumination load connected to the light control device 1 includes first lighting fixtures 31 to 35 each including an incandescent lamp as a light source and connected to each light control circuit 10, and each signal including a fluorescent lamp as a light source. There are two types of lighting fixtures, a second lighting fixture (not shown) connected to the output circuit 20 respectively. The first lighting fixtures 31 to 35 (hereinafter collectively referred to as “first lighting fixtures 30” when they are not particularly distinguished from each other) are connected to an AC power source (commercial power source) 40 via a dimming circuit 10. It connects to the light control apparatus 10 with a power line so that it may be connected. The second lighting fixture includes a control terminal for receiving a dimming signal separately from the power supply terminal connected to the AC power supply 40, and this control terminal is a signal via a signal line (not shown). Connected to the output circuit 20.

  The dimming circuit 10 includes a switch element 101 (see FIG. 3) inserted in a power supply path from the AC power supply 40 to the first lighting fixture 30. The switch element 101 is turned on and off to control the first illumination. The instrument 30 is dimmed. Here, the light control circuit 10 adjusts the electric energy supplied to the 1st lighting fixture 30 per unit time by the phase control system which adjusts the conduction angle of the switch element 101, and is the 1st lighting fixture. 30 is dimmed.

  The second lighting fixture has a lighting device for dimming and lighting the light source (fluorescent lamp), and the light source is supplied to the light source according to the duty ratio of the dimming signal input from the signal output circuit 20 via the signal line. The lighting device includes a dimming control unit that adjusts the supplied power. Therefore, the signal output circuit 20 can dimm the second lighting fixture by adjusting the duty ratio of the dimming signal output to the second lighting fixture connected by the signal line.

  In addition to the light control circuit 10 and the signal output circuit 20, the light control device 1 includes a current detection unit 41, a zero-cross detection unit 42, a filter circuit 43, an operation unit 44, a display unit 45, a storage unit 46, A power supply unit 47 and a control circuit 48 are provided. As shown in FIG. 2, the light control device 1 is configured by housing the above-described parts in a rectangular parallelepiped container 2.

  The control circuit 48 has a CPU (Central Processing Unit) as a main component, and provides control signals for determining the dimming rate of the illumination load to each of the dimming circuits 11 to 15 and the signal output circuits 21 to 25. Output. That is, the control circuit 48 outputs a control signal for determining the conduction angle of the switch element 101 to the dimming circuit 10, and outputs a control signal for determining the duty ratio of the dimming signal to the signal output circuit 20. Output.

  The zero-cross detector 42 monitors the input voltage from the AC power supply 40 and detects the zero-cross point of this input voltage. The output of the zero cross detector 42 is input to the control circuit 48 via the filter circuit 43.

  As shown in FIG. 2, the operation unit 44 includes dimming switches 441 and 442 for adjusting the dimming rate for each lighting load (the dimming circuit 10 or the signal output circuit 20), and switching to an inspection mode described later. And an inspection switch 443. The control circuit 48 determines the dimming rate of the dimming circuit 10 or the signal output circuit 20 or switches to the inspection mode in accordance with a user operation on the operation unit 44. The control circuit 48 increases the dimming rate when one dimming switch 441 is operated, and decreases the dimming rate when the other dimming switch 442 is operated. The dimming switches 441 and 442 and the inspection switch 443 are each constituted by a pushbutton switch in which an operation element is exposed on the front surface of the body 2. The operation unit 44 may include various setting dip switches.

  As shown in FIG. 2, the display unit 45 includes a level display unit 451 to 455 that displays the dimming rate and a state display unit 456 that indicates the operation state of the dimming circuit 10 or the signal output circuit 20. Each optical circuit 10 or signal output circuit 20) has the same. The level display units 451 to 455 and the status display unit 456 are each composed of a light emitting diode exposed on the front surface of the container 2, and the lighting state (separate lighting / extinguishing) is controlled by the control circuit 48. The control circuit 48 displays the dimming rate stepwise (here, five steps) depending on the number of the level display portions 451 to 455 that are lit.

  The dimming device 1 of the present embodiment is used with a total of five illumination loads connected to the first lighting fixture 30 and the second lighting fixture. Therefore, the dimming switches 441 and 442 of the operation unit 44, the level display units 451 to 455 of the display unit 45, and the status display unit 456 are provided in units of five to correspond to the illumination loads of each system. Below, as shown in FIG. 1, the case where the five 1st lighting fixtures 31-35 are connected to the light control circuits 11-15 as illumination load is demonstrated as an example.

  In the storage unit 46, combinations of dimming rates for a plurality of scenes are stored using a combination of dimming rates for a plurality of systems (here, five systems) of illumination loads as a scene. The control circuit 48 can easily realize the lighting effect according to the life scene by reading the scene stored in the storage unit 46 and determining the dimming rate of the lighting load of each system.

  The power supply unit 47 converts the voltage applied from the AC power supply 40 into a DC voltage, and supplies operating power to each unit of the light control device 1. The dimmer 1 includes current transformers 471 and 472 between the power supply unit 47 and the AC power supply 40 and between the power supply unit 47 and the control circuit 48, respectively.

  The current detection unit 41 is supplied with current (hereinafter referred to as “first lighting fixtures 31 to 35”) from the AC power supply 40 through the switch elements 101 (see FIG. 3) of the dimming circuits 11 to 15. The magnitude of “load current” is detected. The current detection unit 41 includes a current transformer or the like provided between one input end of the AC power supply 40 and the plurality of dimming circuits 11 to 15, and the dimming circuit 11 starts from one input end of the AC power supply 40. The current flowing through -15 is detected as a load current.

  In the present embodiment, the switch elements 101 of the dimming circuits 11 to 15 are connected to the AC power source 40 with one end connected to each other and the other end connected to the AC power source via the individual first lighting fixtures 31 to 35. 40. Only one current detector 41 is provided for the plurality of dimming circuits 11 to 15 between the connection point between the one ends of the switch elements 101 of the dimming circuits 11 to 15 and the AC power supply 40. . The detection result (the magnitude of the load current) of the current detector 41 is output to the control circuit 48. Note that the current detection unit 41 is not limited to the above configuration, and includes, for example, a resistor inserted between the AC power supply and the dimming circuits 11 to 15, and the voltage across the resistor is a detection value corresponding to the magnitude of the load current. The configuration may be such that it is output to the control circuit 48 as (voltage value).

  Next, a specific circuit configuration of the dimming circuit 10 will be described with reference to FIG. In FIG. 3, only one system of the first lighting fixture 30 and the dimming circuit 10 is illustrated, but actually, the first lighting fixtures 31 to 35 and the dimming circuits 11 to 11 of a plurality of systems (five systems). 15 is connected to the AC power source 40.

  The dimming circuit 10 includes a switch element 101 inserted between the AC power supply 40 and the first lighting fixture 30, and a noise prevention capacitor 102 connected between the input terminals of the AC power supply 40. Here, a bidirectional thyristor is used as the switch element 101, and a closed circuit is formed by the AC power supply 40, the switch element 101 of each dimming circuit 10, and each first lighting fixture 30.

  The light control circuit 10 further includes a photocoupler 103 in which the light receiving element is a phototriac, a series circuit of resistors 104 and 105, and a capacitor 106 connected in parallel to the resistor 105. The series circuit of the phototriac of the photocoupler 103 and the resistors 104 and 105 is connected to the AC power supply 40 via the current detection unit 41, and the connection point between the resistor 104 and the resistor 105 is connected to the gate terminal of the switch element 101. ing.

  The control circuit 48 outputs a control signal to the light emitting element of the photocoupler 103 in each dimming circuit 10 and drives the photocoupler 103 with the control signal. Here, the control circuit 48 drives the photocoupler 103 with a control signal synchronized with the input voltage from the AC power supply 40 based on the zero-cross point of the input voltage from the AC power supply 40 detected by the zero-cross detection unit 42.

  According to the above configuration, the control circuit 48 can trigger the switch element 101 by turning on the phototriac of the photocoupler 103 at a desired conduction angle and applying a voltage to the gate terminal of the switch element 101. . That is, the control circuit 48 can turn on the switch element 101 at a desired conduction angle, and can adjust the amount of power supplied to the first lighting fixture 30 per unit time. Thereby, the light control circuit 10 can light-control the 1st lighting fixture 30.

  By the way, in the dimming device 1 of the present embodiment, the control circuit 48 compares the dimming control unit 481 that controls on / off of the switch element 101 of the dimming circuit 10 with the detection value of the current detection unit 41 with a predetermined specified value. And a determination unit 482 that determines that an abnormality occurs when the detected value is equal to or greater than a specified value. Further, the control circuit 48 includes a mode switching unit 483 that switches the operation mode of the dimming control unit 481.

  That is, the dimming control unit 481 sequentially selects the dimming circuit 10 to be inspected from the normal mode in which the lighting load is dimmed and the dimming circuit 10, and sets the switch element 101 to be inspected. There are two operation modes: an inspection mode for outputting a control signal to be turned on. If there is an operation input from the user to the inspection switch 443 of the operation unit 44, the mode switching unit 483 switches the operation mode of the dimming control unit 481 from the normal mode to the inspection mode.

  In the present embodiment, the dimming control unit 481 selects the dimming circuits 11, 12, 13, 14, and 15 as inspection objects in this order in the inspection mode, and the switch element 101 of the dimming circuit 10 to be inspected. A control signal for continuously turning on the signal at a predetermined time is output. Specifically, the dimming control unit 481 supplies a predetermined current to the light emitting element of the photocoupler 103 to turn on the switch element 101. The mode switching unit 483 automatically completes the inspection mode when the dimming control unit 481 sets all the dimming circuits 11 to 15 to be inspected once and completes the inspection of all the dimming circuits 10. Enter mode.

  Here, the determination unit 482 compares the detection value (load current) of the current detection unit 41 with the specified value in the state where the inspection mode is selected instead of the normal mode in the mode switching unit 483, and whether or not there is an abnormality. Determine whether. In other words, the determination unit 482 determines the load current supplied to the illumination load through the switch element 101 in a state where the switch elements 101 to be inspected sequentially selected from the plurality of dimming circuits 10 are continuously turned on. The size is sequentially compared with a prescribed value to determine whether or not there is an abnormality. If the determination unit 482 determines that an abnormality has occurred, the dimming control unit 481 turns off the switch element 101 of the all dimming circuit 10 even if the inspection of all the dimming circuits 10 has not been completed. .

  Furthermore, the status display unit 456 of the display unit 45 functions as a notification unit that notifies the determination result (abnormal / normal) of the determination unit 482. Specifically, the state display unit 456 is in a blinking state that repeatedly turns on and off at predetermined intervals while the dimming control unit 481 operates in the inspection mode, and turns off when the inspection mode ends. The lighting state is controlled by the control circuit 48. Here, if the determination unit 482 determines that the control circuit 48 is abnormal, the control circuit 48 displays a status display corresponding to the inspection target at that time, that is, the light control circuit 10 determined to be abnormal among the plurality of light control circuits 11 to 15. The unit 456 is continuously turned on.

  As a result, the state display unit 456 indicates whether there is an abnormality depending on the lighting state, and if it is determined that there is an abnormality, the dimming circuit 10 determined to be abnormal is displayed among the dimming circuits 11 to 15. The display specified from can be performed. When the determination unit 482 determines that an abnormality has occurred, the state display unit 456 reliably keeps the lighting on until the user confirms the display and, for example, the inspection switch 443 is operated. Announce the abnormality. Note that the blinking display indicating that the operation is performed in the inspection mode may be performed by all the state display units 456, or the state corresponding to the dimming circuit 10 selected as the inspection target by the dimming control unit 481. Only the display unit 456 may perform this.

  Next, operation | movement of the light modulation apparatus 1 of this embodiment mentioned above is demonstrated easily.

  First, when the inspection switch 443 is pressed, the dimming control unit 481 causes the mode switching unit 483 to switch the operation mode from the normal mode to the inspection mode. In the inspection mode, the dimming control unit 481 sequentially selects the dimming circuits 11 to 15 as inspection objects and outputs a control signal for continuously turning on the switch elements 101 to be inspected for a predetermined time. At this time, the status display unit 456 performs blinking display, and the determination unit 482 compares the load current detected by the current detection unit 41 with a specified value to determine whether there is an abnormality.

  Here, if the detection value (load current) of the current detection unit 41 is equal to or greater than the specified value and the determination unit 482 determines that there is an abnormality, the state display unit corresponding to the dimming circuit 10 selected as the inspection target at that time 456 lights continuously to notify the user of the abnormality. If all the dimming circuits 10 have been inspected and there is no abnormality in any of the dimming circuits 10, the status display unit 456 is turned off to notify the user of the end of the inspection mode.

  As explained in the background art section, in the dimming device 1 having a plurality of dimming circuits 10, the installer makes a mistake in wiring when connecting the lighting load to each dimming circuit 10. The illumination load connected to the optical circuit 10 may become a heavy load. In this case, an overcurrent may flow through the switch element 101 when the switch element 101 is turned on. For example, when a plurality of illumination loads that should originally be connected to different dimming circuits 10 are connected in parallel to the output terminals of one dimming circuit 10, the output terminals of the dimming circuit 10 are not connected. An overcurrent may flow through the switch element 101 due to low impedance.

  On the other hand, according to the light control device 1 of the present embodiment, it can be avoided that an overcurrent flows into the switch element 101 due to miswiring or the like, and the increase in the number of components can be suppressed as much as possible. There is an effect that can be done.

  The dimming device 1 according to the present embodiment operates the dimming control unit 481 in the inspection mode after the lighting load is connected to the dimming circuit 10, so that the switch element 101 is continuously turned on, It is determined whether or not a load current exceeding a specified value flows through the switch element 101. In other words, the determination unit 482 does not switch the switch element 101 in a state where the switch element 101 is continuously turned on and the lighting load is fully lit, not in a state where the phase control (switching control) is performed at a certain conduction angle. It is determined whether or not an overcurrent is flowing.

  In the state where the switch element 101 is continuously turned on, the magnitude of the current flowing through the switch element 101 does not change depending on the dimming rate as in the case of dimming lighting, and if the load is heavy due to miswiring or the like, The current flowing through the switch element 101 of the dimming circuit 10 becomes a specified value or more. Therefore, if the overcurrent can flow through the switch element 101 due to miswiring or the like, the light control device 1 can reliably determine the abnormality in the determination unit 482 and notify the user of the abnormality. . If it is determined that there is an abnormality, the user can check the wiring of the lighting load or the like, and can search for and eliminate the cause of the overcurrent flowing through the switch element 101.

  In short, before actually using the light control device 1, the user continuously turns on each switch element 101 for a predetermined time to check whether an overcurrent flows through the switch element 101. Therefore, the use of the light control device 1 in a state where an overcurrent can flow can be avoided. As a result, it is possible to prevent damage to the switch element 101 due to continued use of the light control device 1 in a state where an overcurrent can flow through the switch element 101 due to erroneous wiring or the like.

  Further, in the dimming device 1, the dimming control unit 481 sequentially selects the dimming circuits 10 to be inspected from the plurality of dimming circuits 10 in the inspection mode. Therefore, even if the current detector 41 and the determination unit 482 are not provided for each dimming circuit 10, it is possible to determine which dimming circuit 10 has an overcurrent flowing through the switch element 101. Therefore, even if the number of dimming circuits 10 increases, the number of current detectors 41 and determination units 482 provided in the dimming device 1 does not change, and an increase in the number of parts of the dimming device 1 as a whole can be suppressed as much as possible. .

  In addition, when the determination unit 482 determines that there is an abnormality, the display unit 45 causes the dimming circuit 10 determined to be abnormal depending on the lighting state of the state display unit 456 to be among the plurality of dimming circuits 11 to 15. Display specified from. Therefore, the user can know which of the plurality of light control circuits 11 to 15 is abnormal from the display on the display unit 45, and can quickly deal with it.

  Further, the mode switching unit 483 switches the operation mode of the dimming control unit 481 from the normal mode to the inspection mode according to the operation input of the inspection switch 443. Therefore, after the lighting load is connected to the light control circuit 10, the operator or the user can check the presence or absence of an abnormality at any timing desired by the installer or user by operating the inspection switch 443. Here, if the inspection switch 443 is also used as a power switch (not shown) for turning on / off the power of the light control device 1, the light control device 1 checks whether there is an abnormality every time the power is turned on. Therefore, it is possible to avoid the use of the light control device 1 without checking for the presence or absence of abnormality.

  By the way, the determination unit 482 is not limited to a configuration that determines that an abnormality occurs only when the load current is equal to or greater than a specified value when the switch element 101 is turned on. If there is no load current, it may be determined as abnormal. In other words, when the switch element 101 is turned on, the determination unit 482 is not only in the case where an overcurrent flows through the switch element 101 and the load current exceeds the upper limit value. An abnormality may also be determined when the value falls below the lower limit of the range. Thereby, the light control apparatus 1 can alert | report a user also about abnormality by the disconnection of illumination load, the failure of the switch element 101, etc. FIG.

  Further, the dimming control unit 481 performs full adjustment until the next switch element 101 to be checked is turned on after turning on the switch element 101 to be checked in the check mode. The control may be performed so that the switch element 101 of the optical circuit 10 is turned off. In this case, when the control signal for turning off the switching element 101 is output in the inspection mode, the determining unit 482 determines that the load current is abnormal if the load current is equal to or greater than a predetermined threshold value (<specified value). It is desirable to do.

  Thereby, the dimmer 1 informs the user of this situation as abnormal if the load current flows even during the OFF control of the switch element 101 due to the abnormality of the dimmer circuit 10, for example. can do. However, in this case, since it cannot be specified in which dimming circuit 10 the abnormality has occurred, the blinking display indicating the abnormality is performed in all the status display units 456.

  Furthermore, as another configuration of the present embodiment, the dimming device 1 includes a blocking unit (not shown) inserted between the AC power supply 40 and the dimming circuit 10 for each of the dimming circuits 11 to 15. The configuration may be such that the dimming circuit 10 that is determined to be abnormal by the determination unit 482 is disconnected from the AC power supply 40. In this configuration, the control circuit 48 controls the open / close state of the shut-off unit so that the dimming circuit 10 to be inspected when the determination unit 482 determines that there is an abnormality is disconnected from the AC power supply 40. Thereby, the light control apparatus 1 can avoid that the light control circuit 10 continues operating | operating in the state in which overcurrent flows into the switch element 101, and avoids that overcurrent continues flowing into the switch element 101 over a long time. be able to.

DESCRIPTION OF SYMBOLS 1 Light control apparatus 10,11-15 Light control circuit 30,31-35 1st lighting fixture (lighting load)
40 AC power supply
41 Current detection unit 45 Display unit (notification unit)
48 control circuit 101 switch element 456 state display part (notification part)
481 Light control unit 482 Judgment unit 483 Mode switching unit

Claims (5)

A switch element inserted into a power supply path from the power source to the lighting load is provided, and a plurality of dimming circuits for dimming and lighting the lighting load by controlling power supplied to the lighting load by switching control of the switching element. With
A current detection unit that detects the magnitude of a load current supplied from the power source to each of the lighting loads via each of the dimming circuits, and a control signal that outputs a control signal to the dimming circuit to control the on / off of the switch element. The operation mode of the light control unit, the dimming control unit, the normal mode in which the lighting load is dimmed and the dimming circuit to be inspected from the plurality of dimming circuits are sequentially selected and the inspection target is selected. A mode switching unit that switches between an inspection mode that outputs the control signal that continuously turns on the switch element for a predetermined time, and an abnormality if the detection value of the current detection unit is not within a predetermined normal range in the inspection mode. A light control device comprising: a determination unit that determines; and a notification unit that notifies a determination result of the determination unit.   The determination unit is preset with a predetermined value for determining the normal range, and compares the detection value of the current detection unit with the predetermined value in the inspection mode, and if the detection value becomes equal to or higher than the predetermined value, an abnormality occurs. The light control device according to claim 1, wherein the light control device is determined.   The said alerting | reporting part has a display part which performs the display which pinpoints the said inspection object when it judges that it is abnormal in the said judgment part from the said several light control circuit. Item 3. A light control device according to item 2.   The inspection switch which receives the operation input from a user is provided, The said mode switching part switches from the said normal mode to the said inspection mode according to the operation input of the said inspection switch, The Claim 1 thru | or 3 characterized by the above-mentioned. The light modulation apparatus of any one of Claims. Each of the dimming circuits further includes a blocking unit inserted between the power source and the dimming circuit, and the blocking unit separates the inspection target from the power source when the determination unit determines that an abnormality has occurred. The light control device according to claim 1, wherein the light control device is a light control device.

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