JPH0526367B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a three-phase solid state relay (hereinafter referred to as three-phase
(denoted as SSR).

[Prior art]

Conventionally, when controlling the drive of a three-phase AC motor, an electromagnetic switch, which is a mechanical relay, is used to control the opening and closing of the electromagnetic switch, thereby controlling the supply of three-phase AC power to the motor. Ta. However, this electromagnetic switch has a problem in that under usage conditions where the electromagnetic switch is frequently opened and closed, its contacts become severely worn, resulting in a shortened lifespan.

By the way, conventional single-phase solid-state relays (hereinafter referred to as single-phase SSR) using semiconductors have been used to control the supply of single-phase AC power to loads. does not require a contact like the electromagnetic switch described above, and therefore there is no problem of shortened life due to wear of the contact.

FIG. 1 shows such a single-phase SSR semiconductor main element circuit 80, in which 81 and 82 are power supply side and load side main terminals, 83 and 84 are first and second thyristors, and 85 and 86 are main terminals on the load side. Control terminals 87 and 88 connected to a control circuit (not shown) are resistors 8 and 88, respectively.
9. First and second gate auxiliary circuits each consisting of a diode 90.

When the control signal externally applied to the control circuit is "H", the control terminals 85, 86
As a result, in the positive half cycle of single-phase AC, the power supply side main terminal 81, the first gate auxiliary circuit 87, between the control terminals 85 and 86, the gate of the second thyristor 84, and the load side main terminal 82. An auxiliary current flows through the path, turning on the second thyristor 84,
As a result, the main current flows from the power supply side main terminal 81 through the second thyristor 84 to the load side main terminal 82,
Similarly, in the negative cycle of single-phase AC, the second gate auxiliary circuit 88 and the first thyristor 83
operates, and the main current flows from the load side to the first thyristor 8.
3 to the power supply side, and as a result, single-phase power is supplied to the load.

On the other hand, when the control signal is "L", the control terminals 85 and 86 are in an open state, and as a result, both thyristors 83 and 84 remain off, and single-phase power is not supplied to the load. Therefore, if this single-phase SSR is used, the supply of single-phase power to the load can be controlled to be connected or disconnected by the control signal.

In such a conventional situation, when controlling the supply of the three-phase AC power to the load, the problem of shortened life can be avoided by combining the single-phase SSR instead of the electromagnetic switch. It is considered possible to do so.

[Summary of the invention]

In view of the above, the present invention provides a three-phase SSR as a device for connecting and disconnecting the supply of three-phase AC power to a load, which can avoid the problem of shortened lifespan due to wear of the contacts in the electromagnetic switch. In addition, power supply side and load side main terminals are provided facing each other on the surface of the solid state relay body which houses a semiconductor main element circuit consisting of a power thyristor and an absorber circuit. The gate relay terminals of the power thyristors are arranged alternately through partition walls, and the gate relay terminals and the connection terminals of the control circuit section are made to correspond to each other on the surface thereof, so that the control circuit section is configured to be detachable. The object of the present invention is to provide an economical, highly reliable, compact, and convenient three-phase solid-state relay in which each circuit section can be replaced independently.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figure 2 shows a three-phase SSR7 according to an embodiment of the present invention.
0, as shown in FIG.
The main circuit section 61, which includes three circuits similar to the main element circuit 80 shown in the figure, controls the connection/disconnection of the three-phase AC power supply 62 to the motor 63.

The 3-phase SSR 70, as shown in FIG. Contains an absorber circuit that protects the battery from surge voltages such as those caused by lightning. In addition, main terminals 11 for connecting each of the main element circuits 80 to the three-phase cable 64 on the power supply side or the load side are provided at the front and rear of the upper surface of the SSR main body 10.
a, 12a, 13a and main terminals 11b, 12b,
13b are formed to face each other, and this main terminal 1
The main terminals 1a to 13a and the main terminals 11b to 13b are arranged on straight lines parallel to each other. Gate relay terminals 14, 15, 16 for applying control signals to each of the main element circuits 80 are arranged on the same line as each of the main terminals 11 to 13.
13, and the gate relay terminals 14 to 16 are respectively formed to protrude upward. The main terminals 11 to 13 are each surrounded by a U-shaped output barrier 17 with an open outer side that separates them from each other.
3 and the gate relay terminals 14 to 14, that is, the creepage distance and the spatial distance are ensured. Note that 18 and 19 are screw holes.

Further, the control circuit section 20 houses a control circuit (not shown) for controlling the main element circuit 80 on and off, and a pair of input terminals 22 are arranged on the side thereof. Furthermore, three pairs of output terminals 23, 24, and 25 are arranged facing each other at the front and rear portions, respectively. and the above output terminals 23 to 25
Terminals 23 to 25 and the SSR main body 1, respectively.
Holes 43, 44, and 45 are formed for connecting the gate relay terminals 14 to 16 of No. 0. In addition,
Reference numeral 26 denotes a mounting hole for mounting the control circuit section 20 to the SSR main body 10.

Next, the effects will be explained.

First, when assembling this 3-phase SSR 70, connect the control circuit section 20 to the holes 43 of the output terminals 23 to 25.
~45 is the gate relay terminal 14~1 of the SSR main body 10
6, and fix them with screws using the mounting holes 26 and screw holes 18.

In use, the control signal line from the outside is connected to the input terminal 22 of the control circuit section 20, and the main terminals 11a, 12a, 13a or the main terminals 11b, 12 of the three-phase cable SSR main body 10 on the power supply side and load side are connected.
b, 13b, respectively.

According to the device of this embodiment, the contactless type semiconductor main element circuit 80 connects and disconnects the supply of the three-phase AC power source 62 to the load 63.
Sufficient durability and lifespan can be obtained even under usage conditions that involve frequent opening and closing. In addition, SSR main body 10
Since the control circuit section 20 and the control circuit section 20 are mutually detachable, even if one of them fails, it is only necessary to replace the failed one, which is economical. Furthermore, the control circuit section 20 can be replaced with one having, for example, a phase control function and a timer function, which is very convenient in actual use.

〔Effect of the invention〕

As described above, according to the present invention, the connection and disconnection of the supply of three-phase AC power to the load is performed using a three-phase
Since the three-phase SSR is used, it has sufficient durability and service life even under usage conditions where it is frequently opened and closed.Moreover, the main terminal and gate relay terminal are provided on the surface of the SSR body of the three-phase SSR. The gate relay terminal and the connection terminal of the control circuit section are arranged through a partition wall, and the control circuit section is made to correspond to the connection terminals of the control circuit section on this surface, making it possible to attach and detach the control circuit section, making it possible to replace each circuit section independently, which is economical. This has the effect of providing a three-phase solid nutate relay that is practical, highly reliable, compact, and convenient.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of the semiconductor main element circuit of a single-phase SSR, Fig. 2 is an exploded perspective view of a three-phase SSR according to an embodiment of the present invention, and Fig. 3 is a diagram showing how the three-phase SSR is used. be. 10... SSR main body, 20... Control circuit section, 80
...Semiconductor main element circuit. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A semiconductor main element circuit consisting of power thyristors connected in antiparallel, the semiconductor main element circuit that disconnects the supply from the three-phase AC power supply to the load, and this semiconductor element circuit when the semiconductor element circuit is connected to an abnormal voltage. The main terminals on the power supply side and the load side are arranged facing each other on the surface of the absorber circuit, and the main terminals on the power supply side and the load side are alternately connected to each other through the partition wall. A solid-state relay body is provided with a gate relay terminal of the power thyristor disposed therein, and the solid-state relay body is detachably disposed on the surface of the solid-state relay body, and is connected to the semiconductor main element circuit from the outside. A three-phase solid-state device comprising: a control circuit section that houses a control circuit that performs on/off control according to a control signal, and has a connection terminal arranged to correspond to the gate relay terminal. relay.