JP2015230877A - Switch device and load control system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch device and a load control system using the same that can reduce power loss more greatly than conventional ones.SOLUTION: A controller 10 controls a power supply part 12 so that power is supplied for a time when a remote controller relay 2 is switched from an open state to a close state and for a time which is not shorter than a time when the remote controller relay 2 is switched from the close state to the open state. Furthermore, the controller 10 controls the power supply part 12 so that no power is supplied except for the time when the state of the remote controller 2 is switched. Therefore, a switch device 1 can reduce the power loss more greatly as compared with prior arts.

Description

  The present invention relates to a switch device and a load control system that controls a lighting load or the like using the switch device.

  2. Description of the Related Art Conventionally, a load control system that turns on and off energization of a load using a remote control relay has been provided (see, for example, Patent Document 1).

  The conventional example described in Patent Document 1 includes a latching type remote control relay, a remote control transformer, and a switch device. The remote control relay has a main contact, an auxiliary contact linked to the main contact, and a relay winding. The main contact is inserted into a power supply path from a commercial power supply to a load (for example, a lighting load). The relay winding is fed from a remote control transformer via an auxiliary contact. That is, the energization direction of the relay winding is switched according to the state of the auxiliary contact.

  The remote control transformer generates power (AC power) for driving the relay winding. The switch device has an operation unit that can be manually operated, and is configured to cause an exciting current to flow through the relay winding in accordance with an operation of the operation unit.

  Further, the switch device includes a first LED that is turned on when the lighting load is turned on, and a second LED that is turned on when the lighting load is turned off. These two LEDs are configured to light up with a current supplied from a remote control transformer via a relay winding and an auxiliary contact. That is, the two LEDs of the switch device individually display the state (on and off) of the main contact of the remote control relay.

JP 2002-110011 (see paragraphs 0002-0007 and FIGS. 34 and 35)

  However, in the conventional example described in Patent Document 1, current continues to flow through the relay winding of the remote control relay other than when the remote control relay is switched from on to off and from off to on. Therefore, there is a problem that power loss in the relay winding increases.

  The present invention has been made in view of the above-described problems, and aims to reduce power loss as compared with the conventional example.

  The switch device of the present invention is a switch device that controls a remote control relay that opens and closes a power supply path from a power source to a load, a power supply unit that supplies driving power to the remote control relay, and an operation unit that receives an operation input. A control unit that controls the supply of power by the power supply unit in response to the operation input received by the operation unit, and the control unit is a time for the remote control relay to switch from an open state to a closed state, and The power supply unit is controlled so that the power is supplied only for a short time that is not shorter than the time for the remote control relay to switch from the closed state to the open state, and is not supplied except when the state of the remote control relay is switched. It is comprised so that it may be comprised.

  A load control system according to the present invention includes a remote control relay that opens and closes a power supply path from a power source to a load, and the switch device.

  The switch device and the load control system of the present invention have an effect that the power loss can be reduced as compared with the conventional example.

It is a block diagram which shows embodiment of the switch apparatus which concerns on this invention. It is a circuit block diagram of the electric power feeding part in the same as the above. It is an external appearance perspective view same as the above. It is an external appearance perspective view of the state which removed the operation handle same as the above. It is a timing chart for operation | movement description same as the above. It is a system configuration figure showing an embodiment of a load control system concerning the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a switch device according to the present invention and embodiments of a load control system according to the present invention will be described in detail with reference to the drawings. In addition, in this embodiment, although illumination load is illustrated as load, the kind of load is not limited to illumination load.

  As shown in FIG. 6, the load control system of the present embodiment includes a switch device 1 and three remote control relays 2 (2A, 2B, 2C). However, in the following description, the symbols “2A”, “2B”, and “2C” are assigned when distinguishing the three remote control relays, and the symbol “2” is assigned when the three remote control relays are not distinguished. ing. Similarly, the symbols “4A”, “4B”, and “4C” are assigned when the three illumination loads are distinguished, and the symbol “4” is assigned when the three illumination loads are not distinguished.

  The remote control relay 2 is well known in the art and comprises a main contact 20, a relay winding 21, an auxiliary contact 22, diodes 23 and 24, and the like. The main contact 20 is inserted into a power feeding path from the power source (AC power source 3) to the illumination load 4. A common terminal of the auxiliary contact 22 is connected to one end of the relay winding 21. The other end of the relay winding 21 is connected to one signal terminal.

  The anode of the diode 23 is connected to one switching terminal of the auxiliary contact 22, and the cathode of the diode 24 is connected to the other switching terminal of the auxiliary contact 22. The auxiliary contact 22 is configured to be interlocked with the main contact 20. For example, when the main contact 20 is in an open state (see FIG. 6), the common terminal is connected to the switching terminal on the diode 23 side, and the main contact 20 is closed. In the state, the common terminal is connected to the switching terminal on the diode 24 side. The cathode of the diode 23 and the anode of the diode 24 are connected to the other signal terminal. Although not shown, a series circuit (differential circuit) of a capacitor and a resistor is inserted between the anode and cathode of one diode 23.

  When a DC voltage is applied between the signal terminals, the excitation current flows through the path of one signal terminal → relay winding 21 → auxiliary contact 22 → diode 23 → the other signal terminal, so the main contact 20 is closed from the open state. Switch to the state (turn on). When the main contact 20 is turned on, the auxiliary contact 22 is switched to the diode 24 side in conjunction with the main contact 20, so that no exciting current flows through the relay winding 21. However, since the remote control relay 2 is a latching type relay having a permanent magnet, the main contact 20 is maintained in the closed state even after the exciting current is stopped.

  Further, when a reverse DC voltage is applied between the signal terminals, an exciting current flows through the path of the other signal terminal → diode 24 → auxiliary contact 22 → relay winding 21 → one signal terminal. Switches from closed to open (turns off). When the main contact 20 is turned off, the auxiliary contact 22 is switched to the diode 23 side in conjunction with the main contact 20, so that no exciting current flows through the relay winding 21. However, the main contact 20 is maintained in the open state even after the exciting current is stopped.

  When the remote control relay 2 (the main contact 20 thereof) is turned on, AC power is supplied from the AC power source 3 to the lighting load 4 via the remote control relay 2, and the lighting load 4 is turned on (lights up). When the remote control relay 2 (the main contact 20 thereof) is turned off, AC power is not supplied from the AC power source 3 to the lighting load 4 via the remote control relay 2, and the lighting load 4 is turned off (extinguished). However, in the load control system of the present embodiment, switches 5A, 5B, and 5C are inserted in the respective power supply paths from the AC power supply 3 to the lighting loads 4A, 4B, and 4C in addition to the remote control relays 2A, 2B, and 2C. . These switches 5A, 5B, and 5C are wall switches embedded in a wall, for example, and are configured to open and close a contact each time an operation handle (not shown) is operated. That is, when the remote control relay 2 is in the on state, the lighting loads 4A, 4B, and 4C are individually turned on and off by operating the switches 5A, 5B, and 5C. Further, when the contacts of the switches 5A, 5B, and 5C are closed, the illumination load 4 is turned on / off according to the on / off of the remote control relay 2.

  Next, the switch device 1 of the present embodiment will be described.

  As illustrated in FIG. 1, the switch device 1 according to the present embodiment includes a control unit 10, an operation unit 11, a power feeding unit 12, a power supply unit 15, a constant voltage circuit 16, a display unit 17, and the like.

  The control unit 10 is preferably composed of a microcontroller (for example, PIC16F1503 manufactured by Microchip Technology Inc.) and a program executed by the microcontroller.

  The power supply unit 15 is configured to convert AC power (for example, AC power having an effective value of 100 to 120 volts) supplied from the AC power source 3 into DC power (for example, DC power of 24 volts). Such a power supply unit 15 is realized by, for example, an insulating switching power supply circuit that is conventionally known.

  The constant voltage circuit 16 is configured to step down and stabilize the output voltage (24 volt DC voltage) of the power supply unit 15 to a low voltage (for example, 5 volt) DC voltage. Such a constant voltage circuit 16 is realized by, for example, a conventionally known step-down chopper circuit and a three-terminal regulator. In the following description, the output voltage of the constant voltage circuit 16 is referred to as a control voltage. The control voltage is input to a power supply terminal (not shown) of the control unit 10.

  The operation unit 11 includes a momentary type push button switch (not shown), a control voltage is applied to both ends, and one end on the high potential side is connected to one of the input ports of the control unit 10. That is, the input port of the control unit 10 is at a high level (control voltage) when the operation unit 11 is not operated, and is at a low level when the operation unit 11 is operated. Therefore, the control unit 10 receives an operation signal from the operation unit 11 when the input port becomes a low level.

  The display unit 17 includes, for example, a red light emitting diode (red LED) whose emission color is red and a green light emitting diode (green LED) whose emission color is green (not shown). The red LED has a cathode connected to one of the output ports of the control unit 10, and a control voltage is applied to the anode. Further, the green LED has a cathode connected to the other output port of the control unit 10, and a control voltage is applied to the anode. That is, the red LED and the green LED of the display unit 17 are individually turned on / off (lighted / extinguished) by the control unit 10.

  The power feeding unit 12 includes a polarity switching unit 13 and a trigger unit 14. As shown in FIG. 2, the polarity switching unit 13 is preferably composed of an H-bridge driver IC (for example, BD6231 manufactured by Rohm). The H bridge driver IC includes an H bridge circuit 130 including four field effect transistors, and a controller 131 that controls the H bridge circuit 130. The output voltage of the power supply unit 15 (24 volt DC voltage) is input to the H bridge circuit 130. Of the two output terminals 132 and 133 of the H-bridge circuit 130 (polarity switching unit 13), one output terminal 132 is connected to the signal terminal on the relay winding 21 side of the remote control relay 2, and the other output terminal 133 is a trigger. Connected to the unit 14. The controller 131 is configured to drive the H bridge circuit 130 in accordance with control signals output from the two output ports of the control unit 10. That is, when the control signal is output from one output port of the control unit 10, the controller 131 has a polarity (direction) at which the output terminal 133 on the side connected to the trigger unit 14 has a high potential, and the power supply unit 15. The H bridge circuit 130 is driven so as to apply the output voltage. In addition, when a control signal is output from the other output port of the control unit 10, the controller 131 has a polarity (orientation) at which the output terminal 132 connected to the remote control relay 2 has a high potential, and the power supply unit 15. The H bridge circuit 130 is driven so as to apply the output voltage.

  As shown in FIG. 2, the trigger unit 14 includes a plurality (three in the illustrated example) of phototriac couplers 14A, 14B, and 14C. Each of the phototriac couplers 14A, 14B, and 14C includes a light emitting element (LED) 140 and a phototriac 141. A control voltage is applied to the positive electrode (anode) of the light emitting element 140, and the negative electrode (cathode) of the light emitting element 140 is connected to each of three different output ports of the control unit 10. That is, in each phototriac coupler 14A, 14B, 14C, when each output port of the control unit 10 becomes a low level, the light emitting element 140 emits light, and the phototriac 141 is triggered and turned on. While the phototriac 141 is on, the excitation current can be supplied from the power supply unit 15 to the remote control relay 2 with the polarity (direction) switched by the polarity switching unit 13.

  Next, the appearance and structure of the switch device 1 will be described with reference to FIGS.

  The switch device 1 of the present embodiment is embedded in a construction material (for example, a wall) while being attached to the attachment frame 200.

  The mounting frame 200 is, for example, a wide handle type switch dedicated mounting frame standardized by Japanese Industrial Standards. A rectangular window hole (not shown) is opened at the center of the mounting frame 200, and the main body 100 of the switch device 1 is fitted into the window hole. Two sets of two fitting holes 201 are provided along the longitudinal direction on the left and right side walls of the window hole. In addition, attachment pieces 202 are provided on both upper and lower sides of the window hole. Each attachment piece 202 is provided with a long hole 203 through which a box screw is inserted, and circular screw insertion holes 204 are provided on both the left and right sides of the long hole 203. Such a mounting frame 200 is well known in the art, and is fixed to a switch box embedded in a wall with a box screw, or is fixed to a wall plate (such as a plaster board) using a clamp (not shown). Is done.

  The switch device 1 includes a main body 100 made of a synthetic resin molded body having a rectangular box shape, and an operation handle 110 that is swingably attached to the front surface of the main body 100. In the main body 100, a plurality of printed wiring boards (not shown), a plurality of quick connection terminals (screwless terminals), and the like are stored. Circuit components (such as a microcontroller and an H-bridge driver IC) constituting the control unit 10, the operation unit 11, the power feeding unit 12, and the like shown in FIGS. 1 and 2 are mounted on these printed wiring boards. Moreover, the display part 17 (red LED and green LED) is mounted in the left end part in the printed wiring board of the foremost row. Further, an operation unit 11 (push button switch) is mounted at the center of the printed wiring board in the front row.

  A rectangular window hole 101 passes through a portion of the front wall of the main body 100 that faces the display unit 17. That is, red and green light emitted from the display unit 17 is irradiated to the front of the main body 100 through the window hole 101.

  In addition, a T-shaped operation piece 102 is provided at a portion facing the operation unit 11 on the front wall of the main body 100 so as to be bent. That is, when the operation piece 102 is bent rearward, the operation unit 11 (push button switch) mounted on the frontmost printed wiring board is turned on by the operation piece 102.

  Further, a pair of shaft portions 103 are provided in the vertical direction at the left end of the front wall of the main body 100. These shaft portions 103 are formed in a cylindrical shape at the front end portion, and a bearing portion (not shown) of the operation handle 110 is rotatably attached.

  In addition, on the left and right side surfaces of the main body 100, claws 104 that fit into the fitting holes 201 of the mounting frame 200 are provided so as to be arranged at intervals in the vertical direction.

  As shown in FIG. 3, the operation handle 110 is formed in a vertically long rectangular plate shape from a synthetic resin material. The bearing portion is provided at the center of the left end of the rear surface of the operation handle 110. When the bearing portion is attached to the shaft portion 103, the operation handle 110 can swing with respect to the main body 100 with the shaft portion 103 as a fulcrum. That is, when the operation handle 110 is pushed from the front, it swings backward with the shaft portion 103 as a fulcrum, and the operation piece 102 of the main body 100 is bent rearward to turn on the operation portion 11.

  A rectangular window hole 111 is provided at the center of the left end of the operation handle 110. Further, a cover 112 made of a light-transmitting synthetic resin material (for example, acrylic resin) is fitted in the window hole 111. That is, the light emitted from the display unit 17 passes through the window hole 101 of the main body 100 and is then irradiated forward through the window hole 111 and the cover 112 of the operation handle 110.

  Next, the operation of the switch device 1 of this embodiment will be described with reference to the time chart of FIG. 5 and FIGS. In FIG. 5, the horizontal axis indicates time t and the vertical axis indicates voltage V. 5 indicates the output voltage of one output terminal 132 of the polarity switching unit 13, and B in FIG. 5 indicates the output voltage of the other output terminal 133 of the polarity switching unit 13. In FIG. 5, C, D, and E indicate the input voltages of the three phototriac couplers 14A, 14B, and 14C, respectively, and F, G, and H are applied between the signal terminals of the three remote control relays 2A, 2B, and 2C. Each signal voltage is shown.

  Here, it is assumed that all the switches 5 are turned on and all the remote control relays 2 are turned off. Therefore, in this state, all the lighting loads 4 are turned off. Moreover, in the switch apparatus 1, the control part 10 displays that all the illumination loads 4 are light-extinguished on the display part 17 by lighting only green LED.

  When the operation handle 110 is pushed in the state, the control unit 10 receives an operation signal from the operation unit 11. Upon receiving the operation signal, the control unit 10 controls the polarity switching unit 13 to switch the polarity so that the output terminal 132 has a positive polarity and the output terminal 133 has a negative polarity (t = t0). Subsequently, the control unit 10 sets the input terminal of the phototriac coupler 14A to a low level, thereby causing a signal voltage (24 volt DC voltage) with the relay winding 21 side to be positive between the signal terminals of the remote control relay 2A. Is applied (t = t1).

  In the remote control relay 2A, an excitation current flows through the relay winding 21 by applying the signal voltage, so that the main contact 20 is turned on and the auxiliary contact 22 is switched to the diode 24 side. When the remote control relay 2A (the main contact 20 thereof) is turned on, AC power is supplied from the AC power source 3 to the lighting load 4A via the remote control relay 2A, and the lighting load 4A is turned on. When the auxiliary contact 22 of the remote control relay 2A is switched to the diode 24 side, the excitation current does not flow, so the phototriac 141 of the phototriac coupler 14A is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2A (see FIG. 5F).

  After the remote control relay 2A is turned on, the control unit 10 sets the input terminal of the phototriac coupler 14B to a low level, thereby causing a signal voltage (24) between the signal terminals of the remote control relay 2B to be positive on the relay winding 21 side. (DC voltage of volt) is applied (t = t2).

  In the remote control relay 2B, when the signal voltage is applied, an exciting current flows through the relay winding 21, so that the main contact 20 is turned on and the auxiliary contact 22 is switched to the diode 24 side. When the remote control relay 2B (the main contact 20 thereof) is turned on, AC power is supplied from the AC power source 3 to the lighting load 4B via the remote control relay 2B, and the lighting load 4B is turned on. When the auxiliary contact 22 of the remote control relay 2B is switched to the diode 24 side, the exciting current stops flowing, so that the phototriac 141 of the phototriac coupler 14B is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2B as well as the remote control relay 2A (see FIG. 5G).

  After the remote control relay 2B is turned on, the control unit 10 sets the input terminal of the phototriac coupler 14C to a low level, thereby causing a signal voltage (24) between the signal terminals of the remote control relay 2C to be positive on the relay winding 21 side. (DC voltage of volt) is applied (t = t3).

  In the remote control relay 2C, an excitation current flows through the relay winding 21 by applying the signal voltage, so that the main contact 20 is turned on and the auxiliary contact 22 is switched to the diode 24 side. When the remote control relay 2C (the main contact 20 thereof) is turned on, AC power is supplied from the AC power source 3 to the lighting load 4C via the remote control relay 2C, and the lighting load 4C is turned on. When the auxiliary contact 22 of the remote control relay 2C is switched to the diode 24 side, the exciting current stops flowing, so that the phototriac 141 of the phototriac coupler 14C is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2C as well as the remote control relays 2A and 2B (see FIG. 5H).

  Furthermore, after all the remote control relays 2 are turned on, the control unit 10 controls the polarity switching unit 13 to set the output terminals 132 and 133 to the same potential (t = t4). In addition, the control part 10 displays on the display part 17 that all the illumination loads 4 were lighted by lighting only red LED.

  When the operation handle 110 is pushed while all the lighting loads 4 are lit, the control unit 10 receives an operation signal from the operation unit 11. Upon receiving the operation signal, the control unit 10 controls the polarity switching unit 13 to switch the polarity so that the output terminal 133 has a positive polarity and the output terminal 132 has a negative polarity (t = t5). Subsequently, the control unit 10 sets the input terminal of the phototriac coupler 14A to a low level, thereby causing a signal voltage (24 volt DC voltage) that makes the relay winding 21 side negative between the signal terminals of the remote control relay 2A. Is applied (t = t6).

  In the remote control relay 2A, an excitation current in the reverse direction flows through the relay winding 21 when the signal voltage is applied, so the main contact 20 is turned off and the auxiliary contact 22 is switched to the diode 23 side. When the remote control relay 2A (the main contact 20 thereof) is turned off, AC power is no longer supplied from the AC power source 3 to the illumination load 4A, and the illumination load 4A is turned off. When the auxiliary contact 22 of the remote control relay 2A is switched to the diode 23 side, the excitation current does not flow, so the phototriac 141 of the phototriac coupler 14A is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2A (see FIG. 5F).

  After turning off the remote control relay 2A, the control unit 10 sets the input terminal of the phototriac coupler 14B to a low level, thereby setting a signal voltage (24 that makes the relay winding 21 side negative between the signal terminals of the remote control relay 2B. Volt DC voltage) is applied (t = t7).

  In the remote control relay 2B, when the signal voltage is applied, a reverse excitation current flows through the relay winding 21, so that the main contact 20 is turned off and the auxiliary contact 22 is switched to the diode 23 side. When the remote control relay 2B (the main contact 20 thereof) is turned off, AC power is no longer supplied from the AC power source 3 to the lighting load 4B, and the lighting load 4B is turned off. Note that when the auxiliary contact 22 of the remote control relay 2B is switched to the diode 23 side, the exciting current stops flowing, so that the phototriac 141 of the phototriac coupler 14B is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2B as well as the remote control relay 2A (see FIG. 5G).

  After turning off the remote control relay 2B, the control unit 10 sets the input terminal of the phototriac coupler 14C to a low level, thereby causing a signal voltage (24) between the signal terminals of the remote control relay 2C to be negative on the relay winding 21 side. (DC voltage of volts) is applied (t = t8).

  In the remote control relay 2C, when the signal voltage is applied, a reverse excitation current flows through the relay winding 21, so that the main contact 20 is turned off and the auxiliary contact 22 is switched to the diode 23 side. When the remote control relay 2C (the main contact 20 thereof) is turned off, AC power is no longer supplied from the AC power source 3 to the illumination load 4C, and the illumination load 4C is turned off. Note that when the auxiliary contact 22 of the remote control relay 2C is switched to the diode 23 side, the exciting current stops flowing, so that the phototriac 141 of the phototriac coupler 14C is turned off. That is, the control unit 10 applies a pulsed signal voltage to the remote control relay 2C as well as the remote control relays 2A and 2B (see FIG. 5H).

  Furthermore, after all the remote control relays 2 are turned off, the control unit 10 controls the polarity switching unit 13 to set the output terminals 132 and 133 to the same potential (t = t9). In addition, the control part 10 displays on the display part 17 that all the illumination loads 4 were light-extinguished by lighting only green LED.

  As described above, in the switch device 1 according to the present embodiment, the pulsed excitation current is supplied to the relay winding 21 when the remote control relay 2 is switched on / off. The power loss in the line 21 can be reduced.

  The switch device 1 of the present embodiment is a switch device that controls a remote control relay 2 that opens and closes a power feeding path from a power source (AC power source 3) to a load (lighting load 4). The switch device 1 according to the present embodiment includes a power supply unit 12 that supplies driving power to the remote control relay 2, an operation unit 11 that receives an operation input, and the power supply unit 12 corresponding to the operation input that the operation unit 11 receives. The control part 10 which controls supply of the said electric power by is provided. The control unit 10 supplies the power supply unit 12 so as to supply the power for a short time not shorter than the time when the remote control relay 2 is switched from the open state to the closed state and the time when the remote control relay 2 is switched from the closed state to the open state. Control. Further, the control unit 10 is configured to control the power feeding unit 12 so as not to supply the power except when the state of the remote control relay 2 is switched.

  Further, the load control system of the present embodiment includes a remote control relay 2 that opens and closes a power feeding path from a power source (AC power source 3) to a load (lighting load 4), and a switch device 1.

  The switch device 1 and the load control system of the present embodiment are configured as described above, and control the power feeding unit 12 so that power is not supplied to the remote control relay 2 except when the state of the remote control relay 2 is switched. Therefore, the switch device 1 and the load control system of the present embodiment can reduce the power loss more than the conventional example.

  In the switch device 1 of the present embodiment, the power feeding unit 12 is preferably configured to supply the power separately to the plurality of remote control relays 2A, 2B, and 2C. Further, in the switch device 1 of the present embodiment, the control unit 10 is configured to control the power feeding unit 12 so as to supply the power individually and sequentially to the plurality of remote control relays 2A, 2B, and 2C. It is preferable.

  If the switch device 1 of the present embodiment is configured as described above, the power capacity required for the power supply unit 15 is reduced as compared with the case where power is simultaneously supplied to the plurality of remote control relays 2A, 2B, and 2C. can do. As a result, it is possible to reduce the size of the power supply unit 15 in the switch device 1 of the present embodiment. That is, since the power capacity required for the power supply unit 15 is reduced, a wiring board having a small electric capacity can be adopted as a wiring board on which circuit components constituting the power supply unit 15 are mounted. Can be planned.

1 Switch device 2 Remote control relay 3 AC power supply
4 Lighting load (load)
DESCRIPTION OF SYMBOLS 10 Control part 11 Operation part 12 Power supply part 15 Power supply part

Claims (3)

A switch device for controlling a remote control relay that opens and closes a power supply path from a power source to a load,
A power supply unit that supplies driving power to the remote control relay; an operation unit that receives an operation input; and a control unit that controls the supply of power by the power supply unit in response to the operation input received by the operation unit; With
The control unit supplies the power for a short time not shorter than a time when the remote control relay switches from the open state to the closed state and a time when the remote control relay switches from the closed state to the open state, and the remote control relay The switch device is configured to control the power feeding unit so as not to supply the power except when the state is switched. The power feeding unit is configured to supply the power separately to a plurality of the remote control relays,
The switch device according to claim 1, wherein the control unit is configured to control the power supply unit so as to supply the power individually and sequentially to the plurality of remote control relays.   A load control system comprising: a remote control relay that opens and closes a power supply path from a power source to a load; and the switch device according to claim 1.

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