JP2016025456A - Switching arrangement and load control system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching arrangement capable of preventing a switch element from turning ON/OFF due to a counter electromotive force which is generated on a load when an electric power supply to the load is shut down, and a load control system using the same.SOLUTION: A contact point 111 of a relay 11 is electrically connected in an electrical circuit which connects an AC power source 200 and a ventilator load 400 thereacross. A bidirectional thyristor 12 is electrically connected in an electrical circuit which connects the AC power source 200 and an illumination load 300. A surge absorber circuit 60 is connected across the AC power source 200 and the illumination load 300 in parallel to the bidirectional thyristor 12 to reduce a surge voltage which is applied to the bidirectional thyristor 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a switch device, and more particularly to a switch device for switching between a state in which power is supplied from an AC power source to a load and a state in which the supply of power is cut off, and a load control system using the switch device.

  Conventionally, a heat ray sensor that detects a heat ray radiated from the human body is equipped with a heat ray sensor that switches between a state in which power is supplied to the load and a state in which power supply to the load is stopped based on the output of the heat ray sensor. An automatic switch has been proposed (see, for example, Patent Document 1). In this automatic switch with a heat ray sensor, a ventilation fan load and an illumination load are connected as loads. This automatic switch with a heat ray sensor includes a relay connected between an AC power source and a ventilation fan load, and a bidirectional thyristor connected between the AC power source and a lighting load. The relay and the bidirectional thyristor are individually connected. It was on and off.

JP 2005-183319 A

  By the way, the ventilation fan load is provided with a motor that rotates the fan, and when the relay is turned off to interrupt the power supply to the ventilation fan load, there is a possibility that a counter electromotive force is generated in the motor. If the back electromotive force generated in the motor enters a switching circuit that switches on / off of the bidirectional thyristor, the bidirectional thyristor may be turned on for a short time. Here, when a light emitting diode having better response than an incandescent lamp is used as the lighting load, the bidirectional thyristor is turned on for a short time due to the counter electromotive force generated in the motor, and the light emitting diode is lit for a moment. There was a possibility.

  The present invention has been made in view of the above problems, and provides a switch device in which switching elements are not easily switched on / off by a back electromotive force generated in the load when power supply to the load is cut off, and a load control system using the switch device The purpose is to do.

  The switch device of the present invention is electrically connected in the middle of an electrical path connecting a first terminal to which a first load is connected, a second terminal to which a second load is connected, and an AC power source and the first load. A first switch element, and a second switch element electrically connected in the middle of an electrical path connecting the AC power source and the second load, the second switch element including a semiconductor switch, and the AC A surge absorbing element for reducing a surge voltage applied to the second switch element is connected between the power source and the second load in parallel with the second switch element.

  The load control system of the present invention includes the switch device described above, the first load connected to the first terminal, and the second load connected to the second terminal, wherein the first load is inductive. And the second load is an LED lighting fixture, and the surge absorbing element is a surge voltage applied to the second switch element by a counter electromotive force generated in the inductive load when the first switch element is turned off. It is characterized by reducing.

  ADVANTAGE OF THE INVENTION According to this invention, when the electric power supply to load is stopped, the switch apparatus which cannot change on / off of a switch element by the back electromotive force which generate | occur | produces in a load, and a load control system using the same can be provided.

It is a circuit diagram of an embodiment.

  Hereinafter, a switch device and a load control system according to the present embodiment will be described with reference to the drawings. However, the configuration described below is merely an example of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  FIG. 1 is a circuit diagram of the switch device 1 of the present embodiment.

  The switch device 1 of this embodiment includes relays 10 and 11, a bidirectional thyristor 12, a first drive circuit 20, a switching circuit 30, a signal processing unit 40, a second drive circuit 50, and a surge absorber circuit 60. The human sensor 70 and the power supply circuit 80 are provided.

  The switch device 1 of this embodiment includes two input terminals 91 and 92 to which an AC power source 200 such as a commercial AC power source is connected. Further, the switch device 1 includes two load terminals 93 and 94 (second terminals) to which the lighting load 300 is connected as the second load, and two load terminals 95 to which the ventilation fan load 400 is connected as the first load. 96 (first terminal). The input terminal 92 and the load terminals 93 and 95 are electrically connected via the internal wiring of the switch device 1. The illumination load 300 is an LED lighting apparatus that uses, for example, a light emitting diode (LED) as a light source.

  A contact 101 of the electromagnetic relay 10 is connected between the input terminal 91 and the load terminal 94. A current limiting resistor R <b> 1 is connected between the load terminal 93 and the load terminal 94. In a state where the AC power source 200 is connected between the input terminals 91 and 92 and the lighting load 300 is connected between the load terminals 93 and 94, a parallel circuit of the resistor R1 and the lighting load 300 is connected between both ends of the contact 101. The AC power source 200 is connected via

  A series circuit of the bidirectional thyristor 12 and the coil L1 is connected between both ends of the contact 101. A bidirectional thyristor 512 on the output side of the photocoupler 51 is electrically connected between the T2 terminal and the gate terminal of the bidirectional thyristor 12 via a resistor R2. A parallel circuit of a resistor R3 and a capacitor C1 is connected between the gate terminal of the bidirectional thyristor 12 and the T1 terminal. Here, a second switch element including the bidirectional thyristor 12 which is a semiconductor switch is electrically connected in the middle of the electric path connecting the AC power source 200 and the illumination load 300.

  A contact 111 of the electromagnetic relay 11 is connected between the input terminal 91 and the load terminal 96. In a state where the AC power source 200 is connected between the input terminals 91 and 92 and the ventilation fan load 400 is connected between the load terminals 95 and 96, the series circuit of the AC power source 200 and the ventilation fan load 400 is electrically connected between both ends of the contact 111. Connected. Here, the contact 111 of the relay 11 as the first switch element is electrically connected in the middle of the electric path connecting the AC power supply 200 and the ventilation fan load 400.

  A rectifier DB1 formed of a diode bridge is connected between the input terminal 91 and the input terminal 92 through a series circuit of a resistor R5 and a capacitor C3.

  A switching circuit 30 is connected to the output side of the rectifier DB1. The switching circuit 30 includes a resistor R6, Zener diodes ZD1 and ZD2, and a transistor 31.

  Here, a series circuit of a resistor R6 and a Zener diode ZD1 is connected between the DC output terminals of the rectifier DB1. The cathode of the Zener diode ZD1 is connected to the resistor R6, and the anode of the Zener diode ZD1 is connected to the low potential side DC output terminal (circuit ground) of the rectifier DB1.

  The transistor 31 is an NPN type transistor. The collector of the transistor 31 is connected to the DC output terminal on the high potential side of the rectifier DB1 through the Zener diode ZD2. Here, the cathode of the Zener diode ZD2 is connected to the DC output terminal on the high potential side of the rectifier DB1, and the anode of the Zener diode ZD2 is connected to the collector of the transistor 31. The base of the transistor 31 is connected to a connection point between the resistor R6 and the Zener diode ZD1.

  A smoothing capacitor C4 made of, for example, an electrolytic capacitor is connected between the emitter of the transistor 31 and the circuit ground. The emitter of the transistor 31 is electrically connected to the anode of an LED (Light Emitting Diode) 511 included in the photocoupler 51 via a resistor R7. The cathode of the LED 511 is connected to the circuit ground via a switch element 52 (for example, a transistor). The control terminal of the switch element 52 is connected to the output port P3 of the signal processing unit 40, and the switch element 52 is switched on and off according to the voltage level of the output port P3.

  One end of a relay coil 102 provided in the relay 10 is electrically connected to the emitter of the transistor 31. The other end of the relay coil 102 is connected to the circuit ground via a series circuit of a resistor R10 and a switch element 21 (for example, a transistor). A diode D1 is connected to the relay coil 102 in parallel. The cathode of the diode D1 is connected to the emitter of the transistor 31, and the anode of the diode D1 is connected to the resistor R10. The diode D <b> 1 is provided to form a path through which current flows due to the counter electromotive force generated in the relay coil 102 when the current flowing through the relay coil 102 is interrupted. The control terminal of the switch element 21 is connected to the output port P1 of the signal processing unit 40, and the switch element 21 is switched on and off according to the voltage level of the output port P1.

  In addition, one end of a relay coil 112 provided in the relay 11 is electrically connected to the emitter of the transistor 31. The other end of the relay coil 112 is connected to the circuit ground through a series circuit of a resistor R11 and a switch element 22 (for example, a transistor). A diode D2 is connected to the relay coil 112 in parallel. The cathode of the diode D2 is connected to the emitter of the transistor 31, and the anode of the diode D2 is connected to the resistor R11. The diode D <b> 2 is provided to form a path through which current flows due to the counter electromotive force generated in the relay coil 112 when the current flowing through the relay coil 112 is interrupted. The control terminal of the switch element 22 is connected to the output port P2 of the signal processing unit 40, and the switch element 22 is switched on and off according to the voltage level of the output port P2.

  Here, the contact state of the relays 10 and 11 which are switch elements from the current-limiting resistors R10 and R11 and the switch elements 21 and 22 is the first state (ON state) and the second state (OFF state). A first drive circuit 20 that selectively switches to any one is configured.

  The signal processing unit 40 is, for example, a microcomputer, and realizes a desired function when the microcomputer executes a program stored in a memory (not shown).

  The surge absorber circuit 60 (surge absorbing element) is composed of a series circuit (RC series circuit) of a resistor R4 and a capacitor C2. The surge absorber circuit 60 is connected in parallel with the second switch element including the bidirectional thyristor 12 between the AC power supply 200 and the lighting load 300, and has a function of reducing the surge voltage applied to the second switch element. Have.

  The human sensor 70 includes a pyroelectric infrared detection element that detects, for example, heat rays (infrared rays) emitted from the human body. The human sensor 70 detects the presence or absence of a person in the detection area based on the detection result of the infrared detection element, and outputs a detection signal to the signal processing unit 40 when it is detected that a person is present.

  The power supply circuit 80 steps down the AC voltage input from the AC power supply 200, converts it to a DC voltage having a desired voltage value, and supplies an operating voltage to an internal circuit such as the signal processing unit 40.

  The load control system using the switch device 1 of the present embodiment includes the switch device 1, a ventilation fan load 400 connected to the load terminals 95 and 96, and a lighting load 300 connected to the load terminals 93 and 94. The switch device 1 controls the operation state of the lighting load 300 and the ventilation fan load 400 using the detection signal of the human sensor 70 as a trigger.

  The switch device 1 of the present embodiment has the above-described configuration, and the operation of the switch device 1 will be described below.

  First, the operation of the switch device 1 when no person is present in the detection area of the human sensor 70 will be described.

  When there is no person in the detection area of the human sensor 70, no detection signal is input from the human sensor 70 to the signal processing unit 40, and the signal processing unit 40 turns off the illumination load 300 and the ventilation fan load. In order to stop 400, the following operation is performed.

  In a state where no detection signal is input from the human sensor 70, the signal processing unit 40 sets all the voltage levels of the output ports P1, P2, and P3 to a low level and turns off all the switch elements 21, 22, and 52. . In this case, no current flows through the relay coils 102 and 112, and both the contacts 101 and 111 are turned off. In addition, since no current flows through the LED 511 and the bidirectional thyristor 512 is turned off, the bidirectional thyristor 12 is turned off. Therefore, when there is no person in the detection area of the human sensor 70, the illumination load 300 is turned off and the ventilation fan load 400 is stopped. When all the switch elements 21, 22, and 52 are turned off, the base current does not flow through the transistor 31, and the transistor 31 is turned off. Therefore, during the period when the output voltage of the rectifier DB1 exceeds the Zener voltage of the Zener diode ZD1, a current flows from the rectifier DB1 through the resistor R6 and the Zener diode ZD1. Here, the resistor R6 and the Zener diode ZD1 form a second current path RT2 through which a current flows from the AC power source 200 in the second state (a state in which no excitation current flows through the relay coils 102 and 112). A resistor R6 for limiting the current flowing through the second current path RT2 is connected to the second current path RT2.

  Next, the operation of the switch device 1 when a person is present in the detection area of the human sensor 70 will be described.

  When a person is present in the detection area of the human sensor 70 and a detection signal is input from the human sensor 70 to the signal processing unit 40, the signal processing unit 40 turns on the lighting load 300 and causes the ventilation fan load 400 to perform a ventilation operation. The following operations are performed to perform

  First, the signal processing unit 40 switches the voltage levels of the output ports P2 and P3 from the low level to the high level while keeping the voltage level of the output port P1 at the low level. At this time, the switch element 21 continues to be in the off state, and the switch elements 22 and 52 are switched from the off state to the on state.

  When the switch element 22 is turned on, a base current flows through the transistor 31, the transistor 31 is switched from the off state to the on state, and the capacitor C4 smoothes the pulsating voltage input from the rectifier DB1. At this time, when a current flows from the capacitor C4 through the path of the relay coil 112 → the resistor R11 → the switch element 22, an exciting current flows through the relay coil 112, and the contact 111 of the relay 11 is turned on. When the contact 111 is turned on, AC power is supplied from the AC power source 200 to the ventilation fan load 400 via the contact 111, and the ventilation fan load 400 rotates a motor (not shown) to perform a ventilation operation.

  When the switch element 52 is turned on, a current flows from the capacitor C4 through the resistor R7 → the LED 511 → the switch element 52, and the bidirectional thyristor 512 is turned off at the zero cross point of the AC voltage input from the AC power supply 200. Switches from on to on. When the bidirectional thyristor 512 is turned on, a voltage exceeding the breakover voltage is applied to the gate electrode of the bidirectional thyristor 12, and the bidirectional thyristor 12 is switched from the off state to the on state. When the bidirectional thyristor 12 is turned on, AC power is supplied from the AC power source 200 to the illumination load 300 via the bidirectional thyristor 12, and the illumination load 300 is turned on.

  Here, since the illumination load 300 is a resistance load, when the bidirectional thyristor 12 is turned on, an inrush current flows from the AC power supply 200 to the illumination load 300. When the lighting load 300 is lit, an inrush current flows through the bidirectional thyristor 12 that is a semiconductor switch, not the contact 101 of the relay 10, so that the contact 101 can be protected. Note that the ventilation fan load 400 is an inductive load, and no inrush current flows into the ventilation fan load 400 when the contact 111 is turned on. Therefore, a bidirectional thyristor is not connected in parallel to the contact 111, and the ventilation fan load 400 is only connected to the contact 111. The power to is turned on / off.

  The signal processing unit 40 switches the voltage level of the output port P1 from the low level to the high level when a preset first delay time elapses from the time when the bidirectional thyristor 12 is switched from the off state to the on state. At this time, the switch element 21 is switched from the OFF state to the ON state, and the exciting current flows through the relay coil 102, so that the contact 101 is turned ON. The signal processing unit 40 switches the voltage level of the output port P3 from the high level to the low level when a preset second delay time elapses from the time when the contact 101 is switched from the off state to the on state. At this time, the switch element 52 is switched from the on state to the off state, and no current flows to the LED 511, so that the bidirectional thyristor 512 is turned off. When the bi-directional thyristor 512 is turned off, the bi-directional thyristor 12 is turned off, and a current flows from the AC power supply 200 to the lighting load 300 only through the contact 101. The first delay time only needs to be set to a time slightly longer than the time during which the inrush current flows when the lighting load 300 is turned on, and is about 1 second, for example. The second delay time only needs to be set to a time slightly longer than the operation time required from when the relay coil 102 is energized until the contact 101 is closed. It only has to be set to time.

  In this way, when the human sensor 70 detects a person, the switch device 1 turns on the illumination load 300 and causes the ventilation fan load 400 to perform a ventilation operation. In the switch device 1, the lighting load 300 is turned on by switching the bidirectional thyristor 12 from the off state to the on state, so that the contact 101 is less likely to be welded due to the inrush current that flows at the beginning of lighting. In addition, after the first delay time and the second delay time have elapsed since the lighting load 300 is turned on, the switch device 1 supplies a current to the lighting load 300 via the contact 101, and thus bidirectional by energization. Heat generation of the thyristor 12 and power loss in the bidirectional thyristor 12 can be reduced.

  Further, in the first state in which the exciting current flows through the relay coils 102 and 112, the exciting current flows from the rectifier DB1 to the relay coils 102 and 112 via the Zener diode ZD2 and the transistor 31. In this embodiment, since the capacitor C4 is connected between the emitter of the transistor 31 and the circuit ground, the voltage input from the rectifier DB1 via the Zener diode ZD2 and the transistor 31 is almost equal to the capacitor C4. Smoothed to a constant voltage. Since the voltage smoothed by the capacitor C4 is applied to the relay coils 102 and 112, a stable current can flow through the relay coils 102 and 112. Here, the Zener diode ZD2 and the transistor 31 constitute a first current path RT1 through which a current flows from the AC power supply 200 to the first drive circuit 20. Compared with the first current path RT1, the second current path RT2 includes the resistor R6, so that the impedance of the second current path RT2 is higher than the impedance of the first current path RT1. Therefore, compared to the first state in which the exciting current is supplied to the relay coils 102 and 112, in the second state in which the exciting current is not supplied to the relay coils 102 and 112, the current flowing from the AC power supply 200 to the switching circuit 30 is suppressed. Electric power can be reduced.

  Next, the operation of the switch device 1 when no one is present from the detection area of the human sensor 70 in a state where the illumination load 300 is lit and the ventilation fan load 400 is performing a ventilation operation will be described.

  When no person is present in the detection area of the human sensor 70, no detection signal is input from the human sensor 70 to the signal processing unit 40. The signal processing unit 40 performs the following operation to turn off the illumination load 300 and stop the ventilation fan load 400 when a preset operation holding time has elapsed after the detection signal is no longer input.

  The signal processing unit 40 switches the voltage level of the output ports P <b> 1 and P <b> 2 from the high level to the low level when the operation holding time has elapsed since the detection signal is no longer input from the human sensor 70. Further, the signal processing unit 40 keeps the voltage level of the output port P3 at a low level. In this case, current stops flowing through the relay coils 102 and 112, the contacts 101 and 111 are switched from the on state to the off state, the lighting load 300 is turned off, and the ventilation fan load 400 stops the ventilation operation.

  Here, since the ventilation fan load 400 is an inductive load, when the power supply to the ventilation fan load 400 is interrupted, a counter electromotive force of several times the rated voltage is generated in the ventilation fan load 400.

  When the switch device 1 does not include the surge absorber circuit 60 and the electric wire connected to the load terminal 94 and the electric wire connected to the load terminal 95 are close to each other, and there is a stray capacity between the electric wires, the ventilation fan load 400 There is a possibility that the counter electromotive force generated in the circuit wraps around the photocoupler 51. When the counter electromotive force generated in the ventilation fan load 400 goes around the photocoupler 51 and a voltage exceeding the breakover voltage is applied to the bidirectional thyristor 512, the bidirectional thyristor 512 and the bidirectional thyristor 12 are turned on for a short time. Since the illumination load 300 uses an LED having better response than an incandescent lamp as a light source, the illumination load 300 can be turned on instantaneously when the bidirectional thyristor 512 and the bidirectional thyristor 12 are turned on for a short time. There is sex. When the withstand voltage of the bidirectional thyristor 12 is lower than that of the bidirectional thyristor 512 of the photocoupler 51, the bidirectional thyristor 512 is ahead of the bidirectional thyristor 512 due to the counter electromotive force generated in the ventilation fan load 400 when the contact 111 is turned off. The bidirectional thyristor 12 is turned on.

  In the switch device 1 of the present embodiment, a surge absorber circuit 60 composed of a series circuit of a resistor R4 and a capacitor C2 is connected in parallel with the bidirectional thyristor 12. That is, the surge absorber circuit 60 is connected in parallel with a series circuit of the resistor R2, the bidirectional thyristor 512, and the resistor R3. Therefore, even if a counter electromotive force is generated in the ventilation fan load 400 when the contact 111 is turned off, the capacitor C2 is charged through the resistor R4, so that the voltage rises slowly, and the second thyristor 12 including the bidirectional thyristor 12 is included. The surge voltage applied to the two switch elements is reduced. Therefore, the back electromotive force generated in the ventilation fan load 400 makes it difficult for the bidirectional thyristor 512 and the bidirectional thyristor 12 to break over, and the lighting load 300 is less likely to be momentarily lit. The surge absorber circuit 60 is not limited to the RC series circuit of the resistor R4 and the capacitor C4, and may have other circuit configurations or a varistor (not shown).

  As described above, the switch device 1 according to the present embodiment is connected to the first terminal (load terminals 95 and 96) to which the first load (ventilation fan load 400) is connected and the second load (lighting load 300). Second terminals (load terminals 93 and 94). This switch device 1 connects the first switch element (contact 111 of the relay 11) electrically connected in the middle of the electrical path connecting the AC power source 200 and the first load, and the AC power source 200 and the second load. A second switch element that is electrically connected in the middle of the electrical circuit. The second switch element includes a bidirectional thyristor 12 and a bidirectional thyristor 512 that are semiconductor switches. A surge absorbing element (surge absorber circuit 60) for reducing a surge voltage applied to the second switch element is connected between the AC power supply 200 and the second load in parallel with the second switch element.

  As a result, even if the back electromotive force generated in the first load when the first switch element cuts off the power supply to the first load wraps around the second switch element, the surge absorbing element causes the second switch element to The applied surge voltage can be reduced. Therefore, the on / off state of the second switch element is less likely to be switched by the back electromotive force generated in the first load, and an event in which the second load operates instantaneously is less likely to occur.

  In the switch device 1 of the present embodiment, the surge absorbing element (surge absorber circuit 60) is also preferably configured to reduce the surge voltage below the breakover voltage of the semiconductor switch. Since the surge voltage is reduced by the surge absorbing element below the breakover voltage, the semiconductor switch is less likely to be turned on for a short time due to the surge voltage.

  In the switch device 1 of the present embodiment, the first load may be an inductive load (a ventilation fan load 400 in the present embodiment). When the power supply to the inductive load is interrupted, a counter electromotive force is generated in the inductive load. Even if the counter electromotive force wraps around the second switch element, the surge absorbing element is the second switch element. Since the surge voltage applied to the second switch element is reduced, it is difficult to switch on / off of the second switch element.

  In the switch device 1 of the present embodiment, the second load may be a lighting load 300 such as an LED lighting fixture. When the power supply to the first load is cut off, the surge absorption element reduces the surge voltage applied to the second switch element even if the counter electromotive force generated in the first load wraps around the second switch element. , It becomes difficult to switch on / off of the second switch element. Therefore, even when the second load is an LED lighting fixture with good response, when the power supply to the first load is cut off, an event that the LED lighting fixture is momentarily turned on is less likely to occur.

  Moreover, the load control system of this embodiment is the switch apparatus 1, the 1st load connected to the 1st terminal (load terminals 95 and 96), and the 1st load connected to the 2nd terminal (load terminals 93 and 94). 2 loads. The first load is an inductive load (ventilation fan load 400), and the second load is an LED lighting device (lighting load 300). The surge absorbing element (surge absorber circuit 60) reduces the surge voltage applied to the second switch element (bidirectional thyristor 12) by the back electromotive force generated in the inductive load when the first switch element (contact 111) is off. I am letting.

  As described above, the surge absorbing element reduces the surge voltage applied to the second switch element by the counter electromotive force generated in the inductive load when the first switch element is turned off. It becomes difficult to switch on / off of the switch element. Therefore, even when an LED luminaire having good response is connected to the second terminal, an event that the LED luminaire is momentarily turned on when the first switch element is turned off is unlikely to occur.

  By the way, in the switch device 1 of the above-described embodiment, the signal processing unit 40 stops the illumination load 300 and the ventilation fan load 400 after the operation holding time has elapsed since the human sensor 70 no longer detects a person. The operation holding time may be adjustable. For example, the switch device 1 may include a setting switch (not shown) such as a dip switch or a rotary switch, and the operation holding time may be set to a desired time by the setting switch. Further, when the detection signal is not input from the human sensor 70 (that is, when the human sensor 70 no longer detects a person), the signal processing unit 40 immediately turns off the illumination load 300 and sets the ventilation fan load 400 to It may be stopped.

  In the switch device 1 of the above-described embodiment, the relays 10 and 11 are non-latching relays, but may be latching relays. When the relays 10 and 11 are latch-type relays, each of the relays 10 and 11 includes a set coil and a reset coil. When a current flows through the set coil, the contact is turned on, and the contact remains on even when the energization to the set coil is stopped. When a current flows through the reset coil, the contact is turned off, and the contact remains off even when the energization to the reset coil is stopped.

  In the switch device 1 of the present embodiment, the illumination load 300 and the ventilation fan load 400 are connected as loads. However, the load of the switch device 1 is not limited to the illumination load 300 and the ventilation fan load 400, and other electrical devices. May be connected.

  In the switch device 1 of the present embodiment, the operation of the load is controlled by using the detection signal input from the human sensor 70 as a trigger. However, the trigger that changes the operating state of the load is used by the human sensor 70. It is not limited to detection. For example, the switch device 1 changes the operating state of the load triggered by the operation of an operation unit (not shown) by a person or the reception unit (not shown) receiving a radio signal transmitted from a remote control transmitter. You may let them.

1 switch device 10, 11 relay 12 bidirectional thyristor (second switch element, semiconductor switch)
60 Surge absorber circuit 93, 94 Load terminal (second terminal)
95,96 Load terminal (first terminal)
111 contacts (first switch element)
200 AC power supply 300 Lighting load (second load, LED lighting fixture)
400 Ventilation fan load (first load, inductive load)
512 Bidirectional thyristor (second switch element, semiconductor switch)

Claims (5)

A first terminal to which a first load is connected;
A second terminal to which a second load is connected;
A first switch element electrically connected in the middle of an electrical path connecting an AC power source and the first load;
A second switch element electrically connected in the middle of an electrical path connecting the AC power source and the second load;
The second switch element comprises a semiconductor switch;
A switch device, wherein a surge absorbing element for reducing a surge voltage applied to the second switch element is connected between the AC power source and the second load in parallel with the second switch element.   The switch device according to claim 1, wherein the surge absorbing element is configured to reduce the surge voltage below a breakover voltage of the semiconductor switch.   The switch device according to claim 1, wherein the first load is an inductive load.   The switch device according to claim 1, wherein the second load is an LED lighting apparatus. The switch device according to claim 1, the first load connected to the first terminal, and the second load connected to the second terminal,
The first load is an inductive load, and the second load is an LED lighting device;
The load control system, wherein the surge absorbing element reduces a surge voltage applied to the second switch element by a counter electromotive force generated in the inductive load when the first switch element is turned off.

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