TW201603092A - Switch device and load control system - Google Patents

Abstract

The present invention provides a switch device and load control system to inhibit the malfunction occurred due to erroneous wiring, etc. A polarity switching part (13) has a built-in over-current protection circuit (134). Under the circumstance that the current outputted from a first output terminal (132) and a second output terminal (133) exceeds an upper limit value, the over-current protection circuit (134) will output a stop signal to a controller (131). If the controller (131) receives the stop signal, it turns off all FETs (Field-Effect Transistor) of an H-bridge circuit (130) to stop supplying the output current.

Description

Switching device and load control system

The present invention relates to a switching device and a load control system, and more particularly to a switching device for controlling a lighting load or the like, and a load control system using the same.

As a conventional example, the switch device described in Document 1 is exemplified (Reference 1) Japanese Patent Laid-Open Publication No. 2012-174513. In this conventional example, the power supply to the load by the power line is switched and blocked, and is mounted in a switch box that is embedded in the wall surface.

Further, this conventional example includes a relay unit and a control circuit for controlling the relay unit. Relay unit with electromagnetic relay and semiconductor relay. An electromagnetic relay as a mechanical relay is composed of a contact and an exciting coil. The contact is set as a normally open contact in the power line. The excitation coil is provided in parallel with the load (lighting fixture).

The semiconductor relay is composed of an opening and closing unit and a driving unit. The opening and closing unit has a light receiving type semiconductor element that is turned ON/OFF depending on the presence or absence of light from the driving unit. The driving unit has a light-emitting semiconductor element, and emits/stops light emission in accordance with an ON/OFF control signal given from a control circuit.

In other words, in the conventional example described in Document 1, when the switch unit such as the touch panel is operated, the control circuit controls the semiconductor relay to drive the electromagnetic relay, and turns on and off the power supply to the lighting fixture by the power line.

In the conventional example described in Document 1, the exciting coil of the electromagnetic relay is connected to the same power source as the load by the semiconductor relay, so that wiring errors (operation errors) are less likely to occur. However, in the case where the excitation coil is connected to another power source, there is a concern that a wiring error occurs. On the other hand, in the case of a wiring error, an excessive current flows through the current flow path of the exciting coil, which may cause the switching device to malfunction.

In view of the above problems, an object of the present invention is to provide a switch device and a load control system that suppress a failure that occurs due to a wiring error or the like.

The switch device of the present invention controls a remote control relay for supplying and supplying a circuit for supplying power from a power source to a load, and includes: a power supply unit that generates power for driving the remote control relay; and a power supply unit that supplies the power generated by the power supply unit to the remote control relay The operation unit receives the operation input; and the control unit controls the supply of the electric power by the power supply unit in response to the operation input received by the operation unit; and the power supply unit is configured to output the current exceeding a predetermined value The limit value stops the supply of the output current.

The load control system of the present invention includes: a remote control relay that opens and closes a supply circuit that supplies power from the power source; and the switching device controls the remote control relay.

Hereinafter, a switch device according to an embodiment of the present invention and a load control system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the lighting load is exemplified as the load, but the type of the load is not limited to the lighting load.

As shown in FIG. 6, the load control system of the present embodiment includes a switching device 1 and three remote control relays 2 (2A, 2B, and 2C). However, in the following description, the symbols "2A", "2B", and "2C" are given when three remote control relays are distinguished, and the symbol "2" is given when three remote control relays are not distinguished. Similarly, the symbols "4A", "4B", and "4C" are given when three lighting loads are distinguished, and the sign of "4" is given when three lighting loads are not distinguished.

The remote control relay 2 is a conventional device, which is a main contact 20, a relay coil 21, an auxiliary contact 22, diodes 23 and 24, and a pair of signal terminals (a first signal terminal 251, a second signal terminal 252), and the like. Composition. The main contact 20 is inserted into a supply circuit that supplies power to the lighting load 4 from the power source (AC power source 3). One end of the relay coil 21 is connected to a common terminal of the auxiliary contact 22. Further, the other end of the relay coil 21 is connected to the first signal terminal 251.

The switching terminal of one of the auxiliary contacts 22 is connected to the anode of the diode 23, and the other switching terminal of the auxiliary contact 22 is connected to the cathode of the diode 24. 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 (refer to FIG. 6), the common terminal is connected to the switching terminal on the side of the diode 23, and at the main contact 20 When it is in the closed state, its common terminal is connected to the switching terminal on the side of the diode 24 . Further, the cathode of the diode 23 and the anode of the diode 24 are connected to the second signal terminal 252. Further, although not shown in the drawings, a series circuit (differential circuit) of a capacitor and a resistor is inserted between the anode and the cathode of one of the diodes 23.

When a DC voltage is applied between the signal terminals (that is, a DC is applied between the first signal terminal 251 and the second signal terminal 252 so that the first signal terminal 251 becomes higher than the second signal terminal 252. Voltage), the excitation current flows through the path of the first signal terminal 251 → the relay coil 21 → the auxiliary contact 22 → the diode 23 → the second signal terminal 252, so the main contact 20 is switched from the open state to the closed state (also That is, the main contact 20 is ON). When the main contact 20 is turned ON, the auxiliary contact 22 (that is, the common terminal of the auxiliary contact 22) is switched to the side of the diode 24 in conjunction with the main contact 20, so that the exciting current cannot flow to the relay coil 21. . However, the remote control relay 2 is a latch type relay having a permanent magnet, so that the main contact 20 is maintained in a closed state after the excitation current is stopped.

Further, when a DC voltage of opposite polarity is applied between the signal terminals (that is, between the first signal terminal 251 and the second signal terminal 252, the second signal terminal 252 becomes higher than the first signal terminal 251. When the DC voltage is applied in the opposite polarity, the excitation current flows through the path of the second signal terminal 252 → the diode 24 → the auxiliary contact 22 → the relay coil 21 → the first signal terminal 251, so the main contact 20 The closed state is switched to the open state (that is, the main contact 20 is turned OFF). When the main contact 20 is turned off, the auxiliary contact 22 is switched to the side of the diode 23 in conjunction with the main contact 20, so that the exciting current does not flow through the relay coil 21. However, the main contact 20 remains in the open state after the excitation current is stopped.

When the remote control relay 2 (the main contact 20) is turned on, AC power is supplied from the AC power supply 3 to the illumination load 4 via the remote control relay 2, and the illumination load 4 is turned ON (lighting). When the remote control relay 2 (the main contact 20) is turned off, the AC power is not supplied from the AC power source 3 to the illumination load 4 via the remote control relay 2, and the illumination load 4 is turned off (turned off). However, in the load control system of the present embodiment, the switches 5A, 5B, and 5C different from the remote control relays 2A, 2B, and 2C are respectively inserted into the respective supply circuits that supply power to the illumination loads 4A, 4B, and 4C from the AC power supply 3. The switches 5A, 5B, and 5C are, for example, wall-mounted switches that are embedded in the wall surface, and are configured to open and close the contacts each time the handle is operated. That is, when the remote control relay 2 is in the ON state, the respective lighting loads 4A, 4B, and 4C are individually turned on/off by operating the switches 5A, 5B, and 5C. Further, when the contacts of the switches 5A, 5B, and 5C are turned off, the lighting load 4 is turned on/off in response to the ON/OFF of the remote control relay 2.

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

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

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

The power supply unit 15 is configured to convert AC power (for example, AC power having an actual value of 100 to 120 volts) supplied from the AC power supply 3 into DC power (for example, DC power of 24 volts). The power supply unit 15 supplies a constant DC voltage as an output voltage to the power supply unit 12. These power supply units 15 are realized, for example, by a conventional insulated switching power supply circuit.

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 volts) DC voltage. These constant voltage circuits 16 are implemented, for example, by conventional buck chopper circuits and 3-terminal regulators. 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 the power supply terminal of the control unit 10.

The operation unit 11 is composed of a momentary push button switch, and applies a control voltage to both ends, and one end on the high potential side is connected to one of the input ports of the control unit 10. In other words, the input port of the control unit 10 becomes a high level (control voltage) when the operation unit 11 is not operated, and becomes a low level when the operation unit 11 is operated. Therefore, the control unit 10 receives the operation signal from the operation unit 11 by the input 埠 being at a low level.

The display unit 17 has, for example, a red-emitting diode (red LED) having a red-emitting color and a green-emitting diode (green LED) having a green color. 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 its cathode connected to the other output 埠 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 (lighting/turning off) by the control unit 10.

The power supply unit 12 is configured by a polarity switching unit 13 and a trigger unit 14. As shown in FIG. 2, the polarity switching unit 13 is configured by an H-bridge drive IC (for example, BD6231 manufactured by ROHM Corporation). This H-bridge driver IC has an H-bridge circuit 130 composed of four field effect transistors and a controller 131 that controls the H-bridge circuit 130. The output voltage of the power supply unit 15 (a DC voltage of 24 volts) 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 (first output terminal) 132 is connected to the first signal terminal 251 on the relay coil 21 side of the remote control relay 2, and One of the output terminals (second output terminals) 133 is connected to the trigger unit 14. The controller 131 is configured to drive the H-bridge circuit 130 in response to a control signal output from the two output ports (the first output port 135 and the second output port 136) of the control unit 10. In other words, the controller 131 outputs a control signal from the first output port 135 of the control unit 10 so that the second output terminal 133 connected to the trigger unit 14 has a high potential (direction), and the power supply unit 15 is applied. The output voltage drives the H-bridge circuit 130. Further, the controller 131 outputs a control signal from the second output port 136 of the control unit 10 so that the first output terminal 132 connected to the remote control relay 2 has a high potential (direction), and the power supply unit 15 is applied. The H bridge circuit 130 is driven by the output voltage. The polarity switching unit 13 is configured to switch the polarity of the voltage between the first signal terminal 251 and the second signal terminal 252 in accordance with the constant voltage supplied from the power supply unit 15.

As shown in FIG. 2, the trigger unit 14 is composed of a plurality of (three in the illustrated example) optical bidirectional rectifying couplers 14A, 14B, and 14C. The optical bidirectional rectifying couplers 14A, 14B, and 14C have a light emitting element (LED) 140 and an optical bidirectional rectifier 141. A control voltage (DC5V) 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, each of the optical bidirectional rectifying couplers 14A, 14B, and 14C causes the light emitting element 140 to emit light when the output turns of the control unit 10 are at a low level, and triggers the optical bidirectional rectifier 141 to turn ON. When the optical bidirectional rectifier 141 is turned on, the current flows through the optical bidirectional rectifier 141, and the conduction state of the optical bidirectional rectifier 141 is maintained regardless of the level of the output 埠 of the control unit 10. When the optical bidirectional rectifier 141 is turned 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 configuration of the switch device 1 will be described with reference to FIGS. 3 and 4.

The switch device 1 of the present embodiment is fitted with a construction material (for example, a wall surface) in a state of being attached to the mounting frame 200.

The mounting frame 200 is, for example, a special mounting frame for a wide handle-shaped switch that is standardized according to Japanese industrial specifications. A rectangular window opening is opened in the center of the mounting frame 200, and the body 100 of the switch device 1 is embedded in the window. In the side walls located on the left and right sides of the window hole, three sets of the fitting holes 201 of one set are provided in each of the three groups along the longitudinal direction. In addition, mounting pieces 202 are respectively disposed on the upper and lower sides of the window opening. In each of the mounting pieces 202, a long hole 203 through which the box screw is inserted is provided in the center, and a circular screw through hole 204 is provided in each of the right and left sides of the long hole 203. These mounting frames 200 are conventional devices that are fixed to a switch box that is embedded in a wall by a box screw, or are fixed to a wall panel (gypsum board, etc.) using a snap fastener.

The switch device 1 is composed of a main body 100 made of a synthetic resin molded body having a rectangular box shape, and an operation handle 110 swingably attached to a front surface of the main body 100. In the main body 100, a plurality of printed wiring boards, a plurality of quick junction terminals (no screw terminals), and the like are housed. Circuit components (microcontrollers, H-bridge driver ICs, etc.) constituting the control unit 10, the operation unit 11, and the power supply unit 12 shown in FIGS. 1 and 2 are attached to the printed wiring boards. Further, a display portion 17 (a red LED and a green LED) is mounted on the left end portion of the frontmost printed wiring board. Further, an operation unit 11 (button switch) is attached to the center of the frontmost printed wiring board.

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

Further, a T-shaped operation piece 102 is provided in a flexible manner on a portion of the front wall of the body 100 facing the operation portion 11. In other words, when the operation piece 102 is bent rearward, the operation unit 11 (button switch) attached to the frontmost printed wiring board is turned on by the operation piece 102.

Further, a pair of shaft portions 103 are arranged side by side in the vertical direction at the end portion on the left side of the front wall of the body 100. The shaft portions 103 are formed in a cylindrical shape at the front end portion, and the bearing portion of the operating handle 110 is rotatably mounted.

Further, the claw portions 104 fitted to the fitting holes 201 of the mounting frame 200 are provided on the left and right side surfaces of the main body 100 so as to be arranged at intervals in the vertical direction.

The operation handle 110, as shown in Fig. 3, is formed of a synthetic resin material into a longitudinally long rectangular plate shape. The bearing portion is provided at the center of the left end of the rear surface of the operating handle 110. By attaching the bearing portion to the shaft portion 103, the operation handle 110 can be used to swing the body 100 with the shaft portion 103 as a fulcrum. In other words, when the operation handle 110 is pressed from the front, the shaft portion 103 is pivoted rearward, and the operation piece 102 of the main body 100 is bent rearward to turn the operation portion 11 ON.

Further, at the center of the left end of the operation handle 110, a rectangular window 111 is provided. Further, the window portion 111 is fitted with a lid portion 112 formed of a translucent synthetic resin material (for example, an acrylic resin or the like). That is, the light emitted from the display unit 17 passes through the window 101 of the main body 100, and is irradiated forward by operating the window hole 111 of the handle 110 and the lid portion 112.

Next, the operation of the switching device 1 of the present embodiment will be described with reference to the timing chart of Fig. 5 and Figs. 1 and 2 . In addition, the horizontal axis in FIG. 5 represents time t, and the vertical axis represents voltage V. In addition, A in FIG. 5 shows the output voltage of the first output terminal 132 of the polarity switching unit 13, and B in FIG. 5 shows the output voltage of the second output terminal 133 of the polarity switching unit 13. C, D, and E in Fig. 5 respectively indicate input voltages of three optical bidirectional rectifying couplers 14A, 14B, and 14C (i.e., voltages input from the control unit 10); F, G, and H, respectively, for three remote controls. The signal voltage applied between the signal terminals of the relays 2A, 2B, and 2C (that is, between the first signal terminal 251 and the second signal terminal 252).

Here, all the switches 5 are turned on, and all of the remote control relays 2 are turned off. Therefore, in this state, all of the illumination load 4 is turned off. Further, in the switch device 1, the control unit 10 displays the case where all the illumination loads 4 are turned off on the display unit 17 by lighting only the green LEDs.

When the operation handle 110 is pressed in the above state, the control unit 10 receives an operation signal from the operation unit 11. The control unit 10 that has received the operation signal controls the polarity switching unit 13 to switch the polarity of the first output terminal 132 to the positive electrode and the second output terminal 133 to the negative electrode (t=t0). Next, the control unit 10 applies a signal voltage (24 volt DC voltage) to the relay coil 21 side between the signal terminals of the remote control relay 2A by setting the input terminal of the optical bidirectional rectifying coupler 14A to a low level. . That is, the control unit 10 switches the voltage (refer to FIG. 5C) of the input optical bidirectional rectifying coupler 14A from a high level to a low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14A is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2A so that the first signal terminal 251 is at a high potential (refer to FIG. 5F). (t=t1).

In the remote control relay 2A, the excitation current flows through the relay coil 21 by applying the signal voltage, so the auxiliary contact 22 (i.e., the common terminal of the auxiliary contact 22) is switched to the second pole as the main contact 20 is turned ON. Body 24 side. When the remote control relay 2A (the main contact 20) is turned on, the AC power is supplied from the AC power supply 3 to the illumination load 4A via the remote control relay 2A, and the illumination load 4A is turned on. Further, when the auxiliary contact 22 of the remote control relay 2A (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 24, the exciting current becomes impossible to flow, so the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14A shut down. Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14A is interlocked with the auxiliary contact 22 of the remote control relay 2A, and as a result, it is interlocked with the main contact 20 of the remote control relay 2A. That is, the control unit 10 applies a pulse-like signal voltage to the remote control relay 2A (refer to Fig. 5F) (t = t1'). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2A is switched from the open state to the closed state.

When the remote control relay 2A is turned on, the control unit 10 applies a signal voltage positive to the relay coil 21 side between the signal terminals of the remote control relay 2B by setting the input terminal of the optical bidirectional rectifying coupler 14B to a low level ( 24 volt DC voltage). That is, after the remote control relay 2A is turned ON, the control unit 10 switches the voltage of the input optical bidirectional rectifying coupler 14B (refer to FIG. 5D) from the high level to the low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14B is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2B so that the first signal terminal 251 is at a high potential (refer to FIG. 5G). (t=t2).

In the remote control relay 2B, the excitation current flows through the relay coil 21 by applying the signal voltage, so the auxiliary contact 22 (that is, the common terminal of the auxiliary contact 22) is switched to the second pole as the main contact 20 is turned ON. Body 24 side. When the remote control relay 2B (the main contact 20) is turned on, the AC power is supplied from the AC power supply 3 to the illumination load 4B via the remote control relay 2B, and the illumination load 4B is turned on. When the auxiliary contact 22 of the remote control relay 2B (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 24, the exciting current becomes impossible to flow, so the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14B. shut down. Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14B is interlocked with the auxiliary contact 22 of the remote control relay 2B, and as a result, is interlocked with the main contact 20 of the remote control relay 2B. In other words, the control unit 10 applies a pulse-like signal voltage (see Fig. 5G) to the remote control relay 2B in the same manner as the remote control relay 2A (t = t2'). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2B is switched from the open state to the closed state.

When the remote control relay 2B is turned on, the control unit 10 applies a signal voltage to the relay terminal 21 side to the signal terminal of the remote control relay 2C by setting the input terminal of the optical bidirectional rectifying coupler 14C to a low level ( 24 volt DC voltage). That is, after the remote control relay 2B is turned on, the control unit 10 switches the voltage (refer to FIG. 5E) of the input optical bidirectional rectifying coupler 14C from a high level to a low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14C is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2C so that the first signal terminal 251 is at a high potential (refer to FIG. 5H). (t=t3).

In the remote control relay 2C, the excitation current flows through the relay coil 21 by applying the signal voltage, so the auxiliary contact 22 (i.e., the common terminal of the auxiliary contact 22) is switched to the second pole as the main contact 20 is turned ON. Body 24 side. When the remote control relay 2C (the main contact 20) is turned on, the AC power is supplied from the AC power supply 3 to the illumination load 4C via the remote control relay 2C, and the illumination load 4C is turned on. Further, when the auxiliary contact 22 of the remote control relay 2C (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 24, the exciting current becomes impossible to flow, so the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14C is turned off. . Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14C is interlocked with the auxiliary contact 22 of the remote control relay 2C, and as a result, is interlocked with the main contact 20 of the remote control relay 2C. In other words, similarly to the remote control relays 2A and 2B, the control unit 10 applies a pulse-shaped signal voltage to the remote control relay 2C (refer to FIG. 5H). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2C is switched from the open state to the closed state.

Further, after turning on all of the remote control relays 2, the control unit 10 controls the polarity switching unit 13 so that the first output terminal 132 and the second output terminal 133 have the same potential (t=t4). Further, the control unit 10 displays the case where all the illumination loads 4 are turned on on the display unit 17 by lighting only the red LEDs.

When the operation handle 110 is pressed in a state where all of the illumination loads 4 are turned on, the control unit 10 receives an operation signal from the operation unit 11. The control unit 10 that has received the operation signal controls the polarity switching unit 13 to switch the polarity of the second output terminal 133 to the positive electrode and the first output terminal 132 to the negative electrode (t=t5). Next, the control unit 10 applies a signal voltage (24 volt DC voltage) to the relay coil 21 side between the signal terminals of the remote control relay 2A by setting the input terminal of the optical bidirectional rectifying coupler 14A to a low level. . That is, the control unit 10 switches the voltage (refer to FIG. 5C) of the input optical bidirectional rectifying coupler 14A from a high level to a low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14A is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2A so that the second signal terminal 252 is at a high potential (refer to FIG. 5F). (t=t6).

In the remote control relay 2A, by applying the signal voltage, the exciting current in the opposite direction flows through the relay coil 21, so the auxiliary contact 22 (that is, the common terminal of the auxiliary contact 22) is switched as the main contact 20 is turned OFF. To the side of the diode 23 . When the remote control relay 2A (the main contact 20) is turned off, the AC power is not 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 (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 23, the exciting current in the opposite direction becomes impossible to flow, so the light of the optical bidirectional rectifying coupler 14A The bidirectional rectifier 141 is turned off. Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14A is interlocked with the auxiliary contact 22 of the remote control relay 2A, and as a result, it is interlocked with the main contact 20 of the remote control relay 2A. That is, the control unit 10 applies a pulse-like signal voltage to the remote control relay 2A (refer to Fig. 5F) (t = t6'). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2A is switched from the closed state to the open state.

When the remote control relay 2A is turned off, the control unit 10 applies a signal voltage that causes the relay coil 21 side to be negative between the signal terminals of the remote control relay 2B by setting the input terminal of the optical bidirectional rectifying coupler 14B to a low level ( 24 volt DC voltage). That is, after the remote control relay 2A is turned off, the control unit 10 switches the voltage of the input optical bidirectional rectifying coupler 14B (refer to FIG. 5D) from the high level to the low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14B is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2B so that the second signal terminal 252 is at a high potential (refer to FIG. 5G). (t=t7).

In the remote control relay 2B, by applying the signal voltage, the exciting current in the opposite direction flows through the relay coil 21, so the auxiliary contact 22 (i.e., the common terminal of the auxiliary contact 22) is switched as the main contact 20 is turned OFF. To the side of the diode 23 . When the remote control relay 2B (the main contact 20) is turned off, the AC power is not supplied from the AC power source 3 to the illumination load 4B, and the illumination load 4B is turned off. Further, when the auxiliary contact 22 of the remote control relay 2B (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 23, the exciting current in the opposite direction becomes incapable of flowing, so that the optical bidirectional rectifying coupler 14B is bidirectional in light. The rectifier 141 is turned off. Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14B is interlocked with the auxiliary contact 22 of the remote control relay 2B, and as a result, is interlocked with the main contact 20 of the remote control relay 2B. In other words, the control unit 10 applies a pulse-like signal voltage (see Fig. 5G) to the remote control relay 2B in the same manner as the remote control relay 2A (t = t7'). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2B is switched from the closed state to the open state.

When the remote control relay 2B is turned off, the control unit 10 applies a signal voltage that causes the relay coil 21 side to be negative between the signal terminals of the remote control relay 2C by setting the input terminal of the optical bidirectional rectifying coupler 14C to a low level ( 24 volt DC voltage). That is, the control unit 10 switches the voltage of the input optical bidirectional rectifying coupler 14C (refer to FIG. 5E) from a high level to a low level. Thereby, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14C is turned ON. As a result, a signal voltage (24 volt DC voltage) is applied between the first signal terminal 251 and the second signal terminal 252 of the remote control relay 2C so that the second signal terminal 252 is at a high potential (refer to FIG. 5H). (t=t8).

In the remote control relay 2C, by applying the signal voltage, the exciting current in the opposite direction flows through the relay coil 21, so the auxiliary contact 22 (that is, the common terminal of the auxiliary contact 22) is switched as the main contact 20 is turned OFF. To the side of the diode 23 . When the remote control relay 2C (the main contact 20) is turned off, the AC power is not supplied from the AC power source 3 to the illumination load 4C, and the illumination load 4C is turned off. Further, when the auxiliary contact 22 of the remote control relay 2C (i.e., the common terminal of the auxiliary contact 22) is switched to the side of the diode 23, the exciting current in the opposite direction becomes impossible to flow, so that the optical bidirectional rectifying coupler 14C is bidirectional in light. The rectifier 141 is turned off. Thus, the optical bidirectional rectifier 141 of the optical bidirectional rectifying coupler 14C is interlocked with the auxiliary contact 22 of the remote control relay 2C, and as a result, is interlocked with the main contact 20 of the remote control relay 2C. In other words, similarly to the remote control relays 2A and 2B, the control unit 10 applies a pulse-shaped signal voltage to the remote control relay 2C (refer to FIG. 5H). Therefore, the control unit 10 controls the power supply unit 12 to supply electric power in a shorter period of time than when the remote control relay 2C is switched from the closed state to the open state.

Further, after turning off all of the remote control relays 2, the control unit 10 controls the polarity switching unit 13 so that the first output terminal 132 and the second output terminal 133 have the same potential (t=t9). Further, the control unit 10 displays on the display unit 17 that all of the illumination loads 4 are turned off by lighting only the green LEDs.

Here, the signal terminal (the signal terminal connected to the relay coil 21) of one of the remote control relays 2A, 2B, and 2C is connected to the common terminal (the first output terminal 132 of the polarity switching portion 13) of the switching device 1. Further, the other signal terminals (signal terminals connected to the diodes 23 and 24) of the remote control relays 2A, 2B, and 2C are respectively output terminals of the optical bidirectional rectifying couplers 14A, 14B, and 14C of the trigger unit 14 Connected.

However, there is a possibility that the output terminals of the switching device 1 and the output terminals of any of the optical bidirectional rectifying couplers 14A, 14B, and 14C are misinterpreted due to an operation error during wiring construction. When the switching device 1 operates in the state of the misconnection line, an excessive current flows through the trigger unit 14 and the polarity switching unit 13, and the switching device 1 may malfunction. That is, the resistance value of the circuit connected between the common terminal of the switching device 1 and the output terminal of any of the optical bidirectional rectifying couplers 14A, 14B, 14C of the triggering portion 14 is more than the resistance value of the electrical component constituting the remote control relay 2. Since it is low, an excessive current flows in the power supply unit 12.

On the other hand, in the switching device 1 of the present embodiment, the power supply unit 12 is configured to stop the supply of the output current when the output current exceeds the upper limit value. In other words, the H-bridge drive IC constituting the polarity switching unit 13 has an overcurrent protection circuit 134 (see FIG. 2) for the purpose of IC protection for abnormal currents such as a ground current and a short-circuit current. On the other hand, when the current output from the first output terminal 132 and the second output terminal 133 exceeds the upper limit value, the overcurrent protection circuit 134 outputs a stop signal to the controller 131. When receiving the stop signal, the controller 131 turns off all of the field effect transistors of the H-bridge circuit 130 to stop the supply of the output current. As a result, an excessive current does not continue to flow through the switching device 1, and it is possible to suppress the occurrence of a failure of the switching device 1 due to a wiring error or the like. Further, instead of the overcurrent protection circuit 134 built in the H-bridge driver IC, the power supply unit 12 may be provided with an overcurrent protection circuit to stop the supply of the output current when the output current exceeds the upper limit value.

As described above, the switch device 1 of the present embodiment controls the remote control relay 2 for supplying and supplying a circuit for supplying power from the power source (AC power source 3) to the load (lighting load 4). The switch device 1 of the present embodiment includes a power supply unit 15 that generates electric power for driving the remote control relay 2, a power supply unit 12 that supplies the electric power generated by the power supply unit 15 to the remote control relay 2, and an operation unit 11 that accepts an operation input. Further, the switch device 1 of the present embodiment includes the control unit 10, and controls the supply of the electric power by the power supply unit 12 in accordance with the operation input accepted by the operation unit 11. The power supply unit 12 is configured to stop the supply of the output current when the output current exceeds a predetermined upper limit value.

Further, the load control system of the present embodiment includes a remote control relay 2 that opens and closes a supply circuit that supplies power from a power source (AC power source 3) to a load (lighting load 4), and a switching device 1 that controls the remote control relay 2.

The switch device 1 and the load control system according to the present embodiment are configured as described above, and since excessive current does not continue to flow through the switch device 1, it is possible to suppress occurrence of failure of the switch device 1 due to wiring errors or the like.

As is apparent from the above-described embodiment, the switch device (1) according to the first aspect of the present invention controls the remote control relay (2) for supplying and supplying a circuit from the power source (AC power source 3) to the load (lighting load 4). The switch device (1) includes a power supply unit (15) for generating electric power for driving the remote control relay (2), and a power supply unit (12) for supplying the remote control relay (2) with the power supply unit (15). The electric power; and the operation unit (11) accept the operation input. The switch device (1) includes a control unit (10) that controls the supply of the electric power by the power supply unit (12) in response to the operation input received by the operation unit (11). The power supply unit (12) is configured to stop the supply of the output current when the output current exceeds a predetermined upper limit value.

In the switch device (1) according to the second aspect of the present invention, the power supply unit (12) includes the pair of output terminals (the first output terminal 132 and the second output terminal 133) for One of the remote control relays (2) is electrically connected to the signal terminals (the first signal terminal 251 and the second signal terminal 252). The power supply unit (12) includes a controller (131) that applies an output voltage of the power supply unit (15) between the pair of output terminals (the first output terminal 132 and the second output terminal 133). The output current is supplied to the output terminals (the first output terminal 132 and the second output terminal 133). The power supply unit (12) is provided with an overcurrent protection circuit (134). The overcurrent protection circuit (134) is configured to output a stop signal to the controller (131) if the output current exceeds the predetermined upper limit value. The controller (131) is configured to stop the supply of the output current if the stop signal is received.

In the switch device (1) according to the third aspect of the present invention, in the second aspect, the power supply unit (15) is configured to output a constant DC voltage as the output voltage.

In the switch device (1) according to the fourth aspect of the present invention, in the second or third aspect, the predetermined upper limit value is a pair of signal terminals of the remote control relay (2) (first) A circuit having a lower resistance between the signal terminal 251 and the second signal terminal 252) is connected to the value of the output current between the pair of output terminals (the first output terminal 132 and the second output terminal 133).

A load control system according to a fifth aspect of the present invention includes: a remote control relay (2), a supply circuit that opens and closes a power supply (an alternating current power supply 3) to supply a load (lighting load 4); and any one of the first to fourth aspects A switching device (1) that controls the remote control relay (2).

Since the switching device (1) and the load control system are configured as described above, excessive current does not continue to flow through the switching device (1), so that occurrence of failure of the switching device (1) due to wiring errors or the like can be suppressed.

1‧‧‧Switching device
10‧‧‧Control Department
100‧‧‧ body
101‧‧‧ window hole
102‧‧‧Operating film
103‧‧‧Axis
104‧‧‧ claws
11‧‧‧Operation Department
110‧‧‧Operation handle
111‧‧‧ window hole
112‧‧‧ Cover
12‧‧‧Power Supply Department
13‧‧‧Polarity switching department
130‧‧‧H bridge circuit
131‧‧‧ Controller
132, 133‧‧‧ output terminals
134‧‧‧Overcurrent protection circuit
135‧‧‧1st output埠
136‧‧‧2nd output埠
14‧‧‧Trigger
14A, 14B, 14C‧‧‧ optical bidirectional rectifier coupler
140‧‧‧Lighting elements
141‧‧‧Light bidirectional rectifier
15‧‧‧Power Department
16‧‧‧ Constant voltage circuit
17‧‧‧Display Department
2, 2A, 2B, 2C‧‧‧ remote control relay
20‧‧‧Main contacts
200‧‧‧Installation box
201‧‧‧ fitting holes
202‧‧‧Installation
203‧‧‧ long hole
204‧‧‧screw through hole
21‧‧‧Relay coil
22‧‧‧Auxiliary contacts
23, 24‧‧‧ diode
251‧‧‧1st signal terminal
252‧‧‧2nd signal terminal
3‧‧‧AC power supply
4, 4A, 4B, 4C‧‧‧ lighting load
5, 5A, 5B, 5C‧‧‧ switch

Fig. 1 is a block diagram showing a switching device of the embodiment. Fig. 2 is a circuit configuration diagram of a power supply unit in the embodiment. Fig. 3 is a perspective view showing the appearance of the embodiment. Fig. 4 is an external perspective view showing a state in which the operating handle is removed in the embodiment. Fig. 5 is a timing chart for explaining the operation of the embodiment. Fig. 6 is a system configuration diagram showing a load control system of the embodiment.

10‧‧‧Control Department

13‧‧‧Polarity switching department

130‧‧‧H bridge circuit

131‧‧‧ Controller

132, 133‧‧‧ output terminals

134‧‧‧Overcurrent protection circuit

135‧‧‧1st output埠

136‧‧‧2nd output埠

14‧‧‧Trigger

14A, 14B, 14C‧‧‧ optical bidirectional rectifier coupler

140‧‧‧Lighting elements

141‧‧‧Light bidirectional rectifier

2, 2A, 2B, 2C‧‧‧ remote control relay

20‧‧‧Main contacts

21‧‧‧Relay coil

22‧‧‧Auxiliary contacts

23, 24‧‧‧ diode

251‧‧‧1st signal terminal

252‧‧‧2nd signal terminal

Claims (5)

A switch device for controlling a remote control relay for supplying and supplying a circuit for supplying power from a power source to a load, comprising: a power supply unit for generating electric power for driving the remote control relay; and a power supply unit for supplying the remote control relay with the power supply unit The electric power; the operation unit accepts an operation input; and the control unit controls the supply of the electric power by the electric power supply unit in response to the operation input received by the operation unit; and the electric power supply unit is configured to output the current exceeding a predetermined value The upper limit value is used to stop the supply of the output current. The switch device of claim 1, wherein the power supply unit includes: a pair of output terminals for electrically connecting one of the remote control relays to the signal terminals; and the controller, by the pair of outputs Applying an output voltage of the power supply unit between the terminals, and supplying the output current from the pair of output terminals; and an overcurrent protection circuit; wherein the overcurrent protection circuit is configured to: if the output current exceeds the predetermined upper limit, The controller outputs a stop signal; the controller is configured to stop the supply of the output current if the stop signal is received. The switching device of claim 2, wherein the power supply unit is configured to output a constant DC voltage as the output voltage. The switching device of claim 2 or 3, wherein the predetermined upper limit value is a circuit connecting a resistance value lower than a resistance between the pair of signal terminals of the remote control relay to the pair of output terminals The value of the output current is greater than or equal to the value. A load control system comprising: a remote control relay for opening and closing a supply circuit for supplying power from a power source; and a switch device according to any one of claims 1 to 4, wherein the remote control relay is controlled.