JP7115040B2 - Lighting control system and terminals - Google Patents

Description

The present invention relates to lighting control systems and terminals.

Patent Literature 1 discloses a lighting system that includes an opening/closing unit that connects a commercial AC power supply and a lighting fixture. In this lighting system, closing the opening/closing part turns on the lighting equipment, and opening the opening/closing part turns off the lighting equipment. Also, the opening/closing unit has two relays.

Japanese Patent No. 4273282

A relay switch as disclosed in Patent Literature 1 switches between a power supply state and a cutoff state by mechanically disconnecting a switch. As a result, arc discharge may occur between the relay contacts during switching. Arcing can wear out relay contacts. Also, the relay switch may become overheated. This can shorten the life of the terminal. In particular, when the relay switch is operated continuously, the relay switch is likely to overheat.

As a countermeasure, it is conceivable to use a relay switch that uses a relay contact that is less likely to be worn by arc discharge. However, such relay switches are generally expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting control system and a terminal that can reduce manufacturing costs while maintaining reliability.

A lighting control system according to a first disclosure includes a lighting controller that transmits a transmission signal and a terminal device, and the terminal device detects a connection state between a first terminal of a power supply and one terminal of a load. Changing the connection state of the first relay to be changed, the second end of the power supply, and the other terminal of the load, and changing the connection state of the second relay having a smaller rated load than the first relay, and the transmission signal a control unit for controlling the first relay and the second relay, the control unit connecting the second terminal to the other terminal of the load by the second relay, After connecting the first terminal and the one terminal of the load by the first relay, disconnecting the first terminal and the one terminal of the load by the first relay, 2 terminals and the other terminal of the load are disconnected , the power source is an AC power supply, the second relay connects the second terminal and the other terminal of the load, and then the first The time required for the relay to connect the first end and the one terminal of the load is 1/2 or more of the cycle of the AC power supply .
A lighting control system according to a second disclosure includes a lighting controller that transmits a transmission signal and a terminal device, and the terminal device detects a connection state between a first terminal of a power supply and one terminal of a load. Changing the connection state of the first relay to be changed, the second end of the power supply, and the other terminal of the load, and changing the connection state of the second relay having a smaller rated load than the first relay, and the transmission signal a control unit for controlling the first relay and the second relay, the control unit connecting the second terminal to the other terminal of the load by the second relay, After connecting the first terminal and the one terminal of the load by the first relay, disconnecting the first terminal and the one terminal of the load by the first relay, After disconnecting the two terminals and the other terminal of the load, the power source is an AC power supply, and disconnecting the first terminal and the one terminal of the load by the first relay, The time required for the relay to cut off the second terminal and the other terminal of the load is 1/2 or more of the cycle of the AC power supply.
A lighting control system according to a third disclosure includes a lighting controller that transmits a transmission signal and a terminal device, and the terminal device detects a connection state between a first terminal of a power supply and one terminal of a load. Changing the connection state of the first relay to be changed, the second end of the power supply, and the other terminal of the load, and changing the connection state of the second relay having a smaller rated load than the first relay, and the transmission signal a control unit that controls the first relay and the second relay; a communication power supply circuit that receives power from the lighting controller and generates power to drive the first relay and the second relay; and the power supply. a constant-voltage circuit that receives power from and generates power to drive the first relay and the second relay; and drive power to the first relay and the second relay when power is supplied from the power supply a switching circuit for switching the circuit that supplies the power from the communication power supply circuit to the constant voltage circuit, and the control unit connects the second terminal and the other terminal of the load by the second relay, , the first relay connects the first terminal and the one terminal of the load, disconnects the first terminal and the one terminal of the load by the first relay, and then the second relay disconnects the second end from the other terminal of the load.

A terminal device according to a fourth disclosure includes a first terminal that receives power from a first end of a power supply, a second terminal that supplies power to one terminal of a load, and a terminal that receives power from the second end of the power supply. a third terminal that receives power, a fourth terminal that supplies power to the other terminal of the load, a first relay that changes the connection state between the first terminal and the second terminal, and the third terminal a second relay that changes the connection state with the fourth terminal and has a rated load smaller than that of the first relay; and a control unit that controls the first relay and the second relay according to a transmission signal from the outside. , wherein the control unit connects the first terminal and the second terminal after connecting the third terminal and the fourth terminal by the second relay, and connects the first terminal by the first relay After disconnecting the first terminal and the second terminal, the second relay disconnects the third terminal and the fourth terminal , the power supply is an AC power supply, and the second relay disconnects the third terminal The time from connecting the fourth terminal to connecting the first terminal and the second terminal by the first relay is 1/2 or more of the cycle of the AC power supply .

In the lighting control system and terminal device according to the present invention, the withstanding load of the first relay is greater than the withstanding load of the second relay. Therefore, the manufacturing cost can be reduced as compared with the case where the withstanding loads of the first relay and the second relay are both increased. Further, the opening and closing timings of the first relay and the second relay are shifted so that arc discharge does not occur in the second relay, which has a small withstand load. Therefore, reliability can be maintained.

1 is a block configuration diagram of a lighting control system according to Embodiment 1; FIG. 1 is a perspective view of a terminal device according to Embodiment 1; FIG. 2 is a plan view of the terminal device according to Embodiment 1; FIG. 1 is a diagram illustrating a configuration of a lighting control system according to Embodiment 1; FIG. FIG. 9A is a plan view, a front view, and a side view of a terminal device according to a second embodiment; FIG. FIG. 10 is a diagram illustrating the configuration of a lighting control system according to Embodiment 2; FIG. 8 is a circuit diagram of a switching circuit according to Embodiment 2; FIG. FIG. 10 is a diagram illustrating the configuration of a lighting control system according to a first modified example of the second embodiment; FIG. FIG. 11 is a timing chart showing set coil applied voltages of the terminal according to the second modification of the second embodiment; FIG.

A lighting control system and a terminal device according to embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same or corresponding components, and repetition of description may be omitted.

Embodiment 1.
FIG. 1 is a circuit block diagram of a lighting control system 80 according to Embodiment 1. As shown in FIG. A lighting control system 80 includes a management device 81 , a lighting controller 82 that is a control device, a plurality of relay terminals 83 , and a plurality of relays 84 . The management device 81 is composed of, for example, a microcomputer or the like, and performs state monitoring and setting of the lighting control system 80 as a whole.

The lighting controller 82 communicates with a relay terminal device 83 , a wall switch (not shown), various sensors, and the like via the communication line 8 . Transmission signals emitted and received by the lighting controller 82 include address data and control data.

The management device 81 and the lighting controller 82 are connected by a LAN (Local Area Network) 7, which is a wired or wireless communication network. Four relay terminals 83 are connected in parallel to the lighting controller 82 via the communication line 8 . Various sensors such as an illuminance sensor and a motion sensor and an operation panel such as a wall switch are connected to the communication line 8 . Four relays 84 are connected to each relay terminal device 83 via control signal lines 9 .

A relay terminal device 83 and four relays 84 constitute a terminal device 100 . The terminal device 100 is a control system terminal device, and is also called a terminal device with a built-in relay. In this embodiment, four terminals 100 are connected to the lighting controller 82 . The number of terminals 100 provided in the lighting control system 80 may be one or more. Moreover, the relay 84 connected with the relay terminal device 83 should just be one or more.

Each relay terminal device 83 is assigned and set with a unique address. The relay terminal device 83 is identified by the set address. The relay terminal device 83 has a receiving section 831 that receives a transmission signal transmitted by the lighting controller 82 via the communication line 8 . The relay terminal device 83 also has a comparison unit 832 that compares the address data of the transmission signal with the unique address set in the relay terminal device 83 . When the comparison unit 832 determines that the address data of the transmission signal matches the unique address set in the relay terminal device 83, the relay terminal device 83 sends a control signal to the relay 84 to execute the control data of the transmission signal. to send.

Each relay 84 is connected to a load such as a lighting fixture (not shown). The relay 84 receives a signal from the relay terminal device 83 and interrupts power supplied to the load connected to the relay 84 based on the control data.

FIG. 2 is an upper perspective view of the terminal device 100 according to Embodiment 1. FIG. FIG. 3 is a plan view of the terminal device 100 according to Embodiment 1. FIG. The terminal device 100 has an upper case 71 and a lower case 72 . The upper case 71 and the lower case 72 are cases for housing substrates. The boards include, for example, a control board and a main board. The control board is a low voltage board to which transmission signals are input. The control board has the function of the relay terminal device 83 . The main board also has functions of a plurality of relays 84 .

The upper case 71 holds terminal fittings 75a and 75b for connecting the communication line 8 and a load. In this embodiment, the terminal device 100 has four terminal fittings 75a. The terminal device 100 also includes eight terminal fittings 75b. The terminal fittings 75a are arranged side by side at one end of the upper case 71 in the longitudinal direction. The terminal fittings 75b are arranged side by side at the other end of the upper case 71 in the longitudinal direction.

The terminal fitting 75 a corresponds to the input terminal of the relay terminal device 83 . The receiving section 831 receives a transmission signal from the lighting controller 82 via the terminal fitting 75a. The terminal fitting 75 b corresponds to the output terminal of the relay 84 . An external power supply and a load such as a lighting fixture are connected in series to the terminal fitting 75b. A high voltage is applied to the terminal fitting 75b. In order to ensure safety, the upper surface of the terminal fitting 75b of the terminal device 100 is covered with a protective cover 76. As shown in FIG.

The upper case 71 has an upper surface portion 73 at the center of the upper surface in the longitudinal direction. A nameplate (not shown) is attached to the upper surface portion 73 . In the upper case 71, a concave portion is formed at a portion sandwiched between the upper surface portion 73 and the terminal fitting 75a. An operating surface 74 is provided in the recess.

A switch operation portion of the address setting portion 77 projects from the operation surface 74 . The address setting section 77 is a DIP switch. A unique address can be set to the relay terminal device 83 by setting the address setting unit 77 provided on the control board.

FIG. 4 is a diagram illustrating the configuration of the lighting control system 80 according to the first embodiment. The terminal device 100 has two terminals connected to the communication line 8 . The terminal device 100 also has eight terminals 31 to 38 on the load side. The terminal device 100 is provided with two double-sided circuits. The terminal device 100 can independently control the output of the load 12 and the output of the load 14 . The loads 12, 14 are, for example, lighting fixtures. The terminal device 100 performs on/off lighting control of the lighting equipment.

Next, a wiring method for the terminal device 100 will be described. The terminal for the communication line 8 is connected to the communication line 8 by a transition wiring. One terminal of the load 12 is connected to the terminal 31 on the load side, and the other terminal of the load 12 is connected to the terminal 33 . A terminal 31 is a first terminal that supplies power to one terminal of the load 12 . A terminal 33 is a third terminal that supplies power to the other terminal of the load 12 . Similarly, one terminal of the load 14 is connected to the terminal 35 on the load side, and the other terminal of the load 14 is connected to the terminal 37 .

The terminals 32 and 36 are connected to the first end 10a of the load power supply 10, and the terminals 34 and 38 are connected to the second end 10b of the load power supply 10. As shown in FIG. The load power supply 10 is, for example, a 100-250V AC power supply. The terminal 32 is a second terminal that receives power supply from the first end 10 a of the load power source 10 . A terminal 34 is a fourth terminal that receives power supply from the second end 10b of the load power supply 10 .

A first relay 21 is provided between terminals 31 and 32 of the terminal device 100 . A second relay 22 is provided between the terminals 33 and 34 . A third relay 23 is provided between the terminals 35 and 36 . A fourth relay 24 is provided between the terminals 37 and 38 . The first relay 21 and the second relay 22 are interlocked to open and close. Similarly, the third relay 23 and the fourth relay 24 are interlocked to open and close. The first to fourth relays 21 to 24 correspond to the relay 84 in FIG.

The first to fourth relays 21 to 24 are mechanical relays. The first to fourth relays 21 to 24 have contacts provided on the sides of the loads 12 and 14 and coils for opening and closing the contacts. When the coil is energized, the contacts close. When the coil is de-energized, the contacts open. Here, when the contacts are opened and closed, arc discharge may occur and the surfaces of the contacts may become rough. In extreme cases, it can damage the contacts.

The first relay 21 changes the connection state between the terminals 31 and 32 . That is, the first relay 21 changes the connection state between the first end 10 a of the load power supply 10 and one terminal of the load 12 . The second relay 22 changes the connection state between the terminals 33 and 34 . That is, the second relay 22 changes the connection state between the second end 10 b of the load power supply 10 and the other terminal of the load 12 . The second relay 22 has a smaller rated load than the first relay 21 .

Similarly, the third relay 23 changes the connection state between the first end 10 a of the load power supply 10 and one terminal of the load 14 . The fourth relay 24 changes the connection state between the second end 10 b of the load power supply 10 and the other terminal of the load 14 . The fourth relay 24 has a smaller rated load than the third relay 23 .

Here, the rated current is not limited to the rated load, and the first relay 21 and the third relay 23 may have a higher rated current than the second relay 22 and the fourth relay 24 .

The relay terminal device 83 of this embodiment corresponds to a control section that controls the first to fourth relays 21 to 24 according to transmission signals. Next, the operation of opening and closing the first to fourth relays 21 to 24 by the relay terminal device 83 will be described. The circuit to which the load 12 is connected is called circuit 1 here. A circuit to which the load 14 is connected is called a circuit 2 .

Assume that the terminal device 100 receives a transmission signal for closing the circuit 1 while the first relay 21 and the second relay 22 are open. The relay terminal device 83 first energizes the coil of the second relay 22 to close the second relay 22 . At this time, since the first relay 21 is open, no current flows through the circuit 1 even if the second relay 22 is closed. Next, the relay terminal device 83 closes the first relay 21 with a delay of at least T1 from the start of the closing operation of the second relay. An arc discharge occurs between the contacts of the first relay 21 when the first relay 21 is closed.

Next, assume that the terminal device 100 receives a transmission signal for opening the circuit 1 . The relay terminal device 83 first cuts off the energization of the coil of the first relay 21 to open the first relay 21 . An arc discharge occurs between the contacts of the first relay 21 when the first relay 21 opens. Next, the relay terminal device 83 opens the second relay 22 with a delay of at least T1 from the start of the opening operation of the first relay 21 . At this time, since the first relay 21 is already open, no current flows through the circuit 1 even if the second relay 22 is open.

That is, the relay terminal device 83 connects the second end 10b and the other terminal of the load 12 by the second relay 22, and then connects the first end 10a and one terminal of the load 12 by the first relay 21. . In addition, the relay terminal device 83 disconnects the first end 10a and one terminal of the load 12 by the first relay 21, and then disconnects the second end 10b and the other terminal of the load 12 by the second relay 22. .

The operation when the terminal device 100 receives the transmission signal for opening and closing the circuit 2 is as follows except that the first relay 21 is replaced with the third relay 23, the second relay 22 is replaced with the fourth relay 24, and the load 12 is replaced with the load 14. , is similar to circuit 1.

By configuring the terminal device 100 in this way, a large current due to arc discharge flows through the first relay 21 and the third relay 23, which have high rated currents, and arc discharges through the second relay 22 and the fourth relay 24, which have low rated currents. It is possible to suppress the current due to As a result, surface roughness of the contacts of the second relay 22 and the fourth relay 24 can be suppressed.

In this embodiment, as the first relay 21 and the third relay 23, relays having a higher rated current than the second relay 22 and the fourth relay 24 are selected. In other words, only one of the two relays of the relay switch uses an expensive relay provided with measures against arc discharge. Therefore, compared to the case where the withstanding loads of the first to fourth relays 21 to 24 are all increased, the cost of the relays can be reduced, and the manufacturing cost can be reduced.

Here, in general, the opening/closing speed or response speed of the relay contacts is substantially the same for relays not provided with measures against arc discharge and relays provided with measures against arc discharge. In addition, since the operation of the relay contact is a mechanical operation, the opening and closing speed of the relay may vary. For this reason, it is generally difficult to specify which relay opens and closes first when opening and closing instructions are given to two relays at the same time.

On the other hand, in the present embodiment, the relay terminal device 83 is configured so that the first relay 21 and the second relay 22 do not cause arc discharge and the second relay 22, which has a large withstand load. To shift the timing at which the relay 22 opens and closes. Similarly, the relay terminal device 83 controls the opening and closing timings of the third relay 23 and the fourth relay 24 so that arc discharge does not occur in the third relay 23 with a large withstand load and arc discharge does not occur in the fourth relay 24 . shift. Therefore, reliability can be maintained.

The delay time T1 is set, for example, as follows. Alternating current flows through the first to fourth relays 21 to 24 . Therefore, the arc discharge generated by the switching operation of the relay contacts disappears when the load voltage becomes near zero. The load voltage goes to zero every 10 ms when the AC power is 50 Hz and about every 8.3 ms when it is 60 Hz. T1 may be determined using half the zero-cross period of the AC power supply as a guideline. That is, T1 is 5 ms for 50 Hz and about 4.2 ms for 60 Hz.

That is, in the present embodiment, the second relay 22 connects the second end 10b and the other terminal of the load 12, and then the first relay 21 connects the first end 10a and one terminal of the load 12. The time required to turn on is 1/2 or more of the cycle of the AC power supply. Also, the time from when the first relay 21 disconnects the first terminal 10a and one terminal of the load 12 to when the second relay 22 disconnects the second terminal 10b and the other terminal of the load 12 is It is 1/2 or more of the cycle of the AC power supply. The same is true for circuit 2 as well.

If the operating time for opening and closing the contacts of the first relay 21 and the third relay 23 is longer than the operating time for opening and closing the contacts of the second relay 22 and the fourth relay 24, the difference between the opening and closing times should be taken into account. can be decided. In this case, it is necessary to set T1 to be longer than the time during which the contacts of the first relay 21 and the third relay 23 open and close.

In this embodiment, the relay terminal device 83 and the relay 84 are integrated as the terminal device 100 . The relay terminal device 83 and the relay 84 may be provided separately. Moreover, the load power supply 10 is not limited to an AC power supply, and may be a DC power supply.

These modifications can be appropriately applied to lighting control systems and terminals according to the following embodiments. Since the lighting control system and the terminal device according to the following embodiment have many points in common with the first embodiment, the differences from the first embodiment will be mainly described.

Embodiment 2.
5A and 5B are a plan view, a front view, and a side view of the terminal device 200 according to the second embodiment. A terminal device 200 having an AC power supply terminal block may be used instead of the terminal device 100 described in the first embodiment. The terminal device 200 includes a power terminal block 240 for connecting commercial power supplied from the outside, a power terminal block 242 for sending commercial power to other devices, and a load terminal block 244 for connecting loads such as lighting fixtures. . The terminal device 200 of this embodiment includes four load terminal blocks 244 .

FIG. 6 is a diagram illustrating the configuration of a lighting control system 280 according to Embodiment 2. As shown in FIG. The lighting control system 280 includes a lighting controller 82, a terminal device 200, and a plurality of lighting fixtures 212 as loads. The terminal device 200 includes relays 221-228. Relays 221-228 are latching relays. A latching relay closes its contacts when a voltage is applied to the set coil. The latching relay maintains the closed state of the contacts even when the voltage application to the set coil is stopped. Also, the contact is opened by applying a voltage in the opposite direction to the set coil, that is, by applying a voltage to the reset coil.

The terminal device 200 includes a communication power supply circuit 250 , a switching circuit 252 , a constant voltage circuit 254 , a DC/DC circuit 256 and a microcomputer 258 . The communication power supply circuit 250 receives power supply from the lighting controller 82 via the communication line 8, and generates power for driving the relays 221-228. Constant voltage circuit 254 receives power supply from load power supply 10 and generates power for driving relays 221-228. A constant voltage circuit 254 is an AC/DC conversion circuit that stably supplies a DC voltage. When power is supplied from the load power supply 10 , the switching circuit 252 switches the circuit that supplies drive power to the relays 221 to 228 from the communication power supply circuit 250 to the constant voltage circuit 254 .

The DC/DC circuit 256 steps down the voltage supplied from the switching circuit 252 to generate an operating voltage for the microcomputer 258 . Microcomputer 258 has the functions of receiving section 831 and comparing section 832 described in the first embodiment. Further, the microcomputer 258 controls the opening/closing timing of the relays 221 to 228 as described in the first embodiment.

Now, let us consider a case where power for driving the relays 221 to 228 of the terminal device 200 is supplied from the communication line 8 . The communication power supply circuit 250 receives power from the communication line 8 and drives the relays 221-228. At this time, the shorter the wiring of the communication line 8 and the smaller the number of devices connected to the communication line 8, the higher the voltage of the communication line 8 on the terminal device 200 side. When the number of devices connected to the communication line 8 is small, the voltage of the communication line 8 approaches ±24V, for example. Also, the longer the wiring of the communication line 8 and the more devices connected to the communication line 8, the lower the voltage of the communication line 8 on the terminal device 200 side, for example, closer to ±14V.

As the voltage of the communication line 8 increases, the consumption current for driving the relays 221 to 228 increases. If the current driving the relays 221-228 increases, the lighting controller 82 connected to the communication line 8 may detect overcurrent. As a result, there is a risk of malfunction, such as turning the output of the communication line 8 on and off, for example, by the lighting controller 82 .

Here, the switching circuit 252 switches the supply source of driving power to the relays 221 to 228 to the constant voltage circuit 254 when the load power supply 10 that is the AC power supply is supplied. By supplying a stable DC voltage from the constant voltage circuit 254, malfunction of the lighting control system 280 can be suppressed. Also, the current consumption of the lighting control system 280 can be suppressed.

FIG. 7 is a circuit diagram of the switching circuit 252 according to the second embodiment. The switching circuit 252 includes MOS-FETs (Metal-Oxide-Semiconductor Field-Effect Transistors) Q218, Q220 and Q222, which are switching elements. A MOS-FET 218 is provided between the communication line 8 and the relays 221-228.

When the switching circuit 252 is supplied with the DC power 10-1 from the constant voltage circuit 254, the MOS-FET Q218 is turned off via the MOS-FETs Q220 and Q222. As a result, the power supply from the communication power supply circuit 250 to the relays 221 to 228 from the communication line 8 is cut off. The configuration in FIG. 7 is an example of the switching circuit 252, and another configuration may be adopted.

FIG. 8 is a diagram illustrating the configuration of a lighting control system 380 according to the first modified example of the second embodiment. A lighting control system 380 includes a terminal 300 . The terminal device 300 includes a regulator circuit 360 between the switching circuit 252 and the relays 221-228. The regulator circuit 360 steps down the voltage of the relay drive power supply supplied from the communication power supply circuit 250 to a DC voltage that enables the relay operation. Thereby, even if the voltage supplied from the communication power supply circuit 250 becomes high, the power consumption of the relays 221 to 228 can be suppressed.

FIG. 9 is a timing chart showing set coil applied voltages of the terminal device 200 according to the second modification of the second embodiment. When the relay is driven, depending on the selected relay, a current of about 25 mA per relay, for example, flows. When the relays 221 to 228 are operated all at once, a relay drive current corresponding to the number of relays flows through the communication line 8 . At this time, the lighting controller 82 may detect overcurrent. As a result, there is a risk of malfunction, such as turning the output of the communication line 8 on and off, for example, by the lighting controller 82 .

In a second modification, the microcomputer 258 shifts the drive timings of the relays 221 to 228 so that two or more relays are not turned on at the same time, as shown in FIG. That is, the microcomputer 258 outputs a signal for driving the relay 222 after finishing outputting the signal for driving the relay 221 . As a result, the relay drive current of the terminal device 200 can be suppressed to the level of one relay, that is, approximately 25 mA.

Note that the technical features described in each embodiment may be used in combination as appropriate.

80, 280, 380 lighting control system 100, 200, 300 terminal device 10 load power supply 10-1 DC power 10a first end 10b second end 12, 14 load 21 first relay 22 second 2 relay, 23 third relay, 24 fourth relay, 81 management device, 82 lighting controller, 83 relay terminal device, 84 relay, 221 to 228 relay, 212 lighting fixture, 250 communication feeding circuit, 252 switching circuit, 254 constant voltage circuit, 258 microcomputer, 360 regulator circuit

Claims (6)

a lighting controller that transmits a transmission signal;
a terminal;
with
The terminal device
a first relay that changes the connection state between the first end of the power supply and one terminal of the load;
a second relay that changes the connection state between the second end of the power supply and the other terminal of the load and has a smaller rated load than the first relay;
a control unit that controls the first relay and the second relay according to the transmission signal;
with
The control unit connects the second terminal and the other terminal of the load by the second relay, and then connects the first terminal and the one terminal of the load by the first relay, After disconnecting the first terminal and the one terminal of the load by the first relay, disconnecting the second terminal and the other terminal of the load by the second relay ,
the power source is an alternating current power source;
The time from when the second relay connects the second terminal and the other terminal of the load to when the first relay connects the first terminal and the one terminal of the load is A lighting control system , wherein the period of the AC power supply is 1/2 or more . a lighting controller that transmits a transmission signal;
a terminal;
with
The terminal device
a first relay that changes the connection state between the first end of the power supply and one terminal of the load;
a second relay that changes the connection state between the second end of the power supply and the other terminal of the load and has a smaller rated load than the first relay;
a control unit that controls the first relay and the second relay according to the transmission signal;
with
The control unit connects the second terminal and the other terminal of the load by the second relay, and then connects the first terminal and the one terminal of the load by the first relay, After disconnecting the first terminal and the one terminal of the load by the first relay, disconnecting the second terminal and the other terminal of the load by the second relay,
the power source is an alternating current power source;
The time from disconnection of the first terminal and the one terminal of the load by the first relay to disconnection of the second terminal and the other terminal of the load by the second relay is A lighting control system, wherein the period of the AC power supply is 1/2 or more. a lighting controller that transmits a transmission signal;
a terminal;
with
The terminal device
a first relay that changes the connection state between the first end of the power supply and one terminal of the load;
a second relay that changes the connection state between the second end of the power supply and the other terminal of the load and has a smaller rated load than the first relay;
a control unit that controls the first relay and the second relay according to the transmission signal;
a communication power supply circuit that receives power supply from the lighting controller and generates power for driving the first relay and the second relay;
a constant voltage circuit that receives power from the power supply and generates power to drive the first relay and the second relay;
a switching circuit that switches a circuit that supplies drive power to the first relay and the second relay from the communication power supply circuit to the constant voltage circuit when power is supplied from the power supply;
with
The control unit connects the second terminal and the other terminal of the load by the second relay, and then connects the first terminal and the one terminal of the load by the first relay, After the first relay disconnects the first terminal and the one terminal of the load, the second relay disconnects the second terminal and the other terminal of the load . lighting control system. 4. The lighting control system according to claim 3 , wherein the terminal device includes a regulator circuit between the switching circuit and the first and second relays. the first relay and the second relay are latching relays;
The illumination according to any one of claims 1 to 4 , wherein the control unit outputs a signal for driving the second relay after finishing outputting the signal for driving the first relay. control system. a first terminal that supplies power to one terminal of the load;
a second terminal receiving power from the first end of the power supply;
a third terminal that supplies power to the other terminal of the load;
a fourth terminal receiving power from the second end of the power supply;
a first relay that changes a connection state between the first terminal and the second terminal;
a second relay that changes the connection state between the third terminal and the fourth terminal and has a smaller rated load than the first relay;
a control unit that controls the first relay and the second relay according to a transmission signal from the outside;
with
The control unit connects the third terminal and the fourth terminal by the second relay, then connects the first terminal and the second terminal, and connects the first terminal and the first terminal by the first relay. After disconnecting the second terminal, the second relay disconnects the third terminal and the fourth terminal ,
the power source is an alternating current power source;
The time from connecting the third terminal and the fourth terminal by the second relay to connecting the first terminal and the second terminal by the first relay is the period of the AC power supply. A terminal device characterized by being 1/2 or more .

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