JPS6042931A - Three-phase solid-state relay - Google Patents

Abstract

PURPOSE:To use economically and conveniently a titled relay by constituting dividedly a 3-phase solid-state relay (SSR) of an SSR main body and an accessory circuit section having a control circuit and an absorber circuit and forming them mutually attachably and detachably. CONSTITUTION:The 3-phase SSR70 is constituted dividedly, and the main circuit section is stored in the SSR main body 10 being one of them. Further, the control circuit of the main element circuit and the absorber circuit protecting the main element circuit from a surge voltage are stored in the accessory circuit section 30. In assembling them, the accessory circuit section 30 is mounted on the SSR main body 10 so that a control signal input terminal 22, control signal output terminals 23-25 and absorber terminals 32-34 are places respectively on a screw hole 19 of the SSR main body 10, gate relay terminals 14-16 and main terminals 11-13, and they are fixed by a screw 40. Further, the control signal line is connected to the control signal input terminal 22, and a three- phase cable of the power supply side and load side is connected to absorber terminals 32a-34a or 32b-34b.

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 SSR) that controls the supply of three-phase AC power to a load.
It is related to.

[Prior art]

Conventionally, when controlling the drive of a three-phase AC Morph, 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 Morph. 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 out and its lifespan is shortened.

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

FIG. 1 shows a semiconductor main element circuit 80 of such a single-phase SSR.
In the figure, 81 and 82 are the main terminals on the power supply side and the load side, and 83 and 84 are the first terminals. 2nd Cyrisk, 85.86
87.8 is a control terminal connected to a control circuit not shown.
8, the first .
This is a second gate auxiliary circuit.

Then, the control signal applied from the outside to the above control circuit is “
When the signal is high, the control terminals 85 and 86 are short-circuited,
As a result, in the positive half cycle of single-phase AC, the power supply side main terminal 81. First gate auxiliary circuit 87. Control terminal 85
．． 86, the gate load side main terminal 8 of the second thyristor 84
The auxiliary current flows through the second path, turning on the second thyristor 84, and 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, and the negative In the half cycle, the second gate auxiliary circuit 88 and the first thyristor 83 operate in the same way, and the main current flows from the load side through the first thyristor 83 to the power supply side.
As a result, single-phase power is supplied to the load.

On the other hand, when the control signal is "L", the control terminal 8
During 5.86, it is open, and as a result, both Sai Risk 8
3.84 remains off and no single-phase power is supplied to the load. Therefore, if this single-phase SSR is used, the supply of the single-phase power source to the load can be controlled 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 in place of the electromagnetic switch. is considered possible.

[Summary of the invention]

In view of this, the present invention is a device for discontinuing the supply of three-phase AC power to a load, and is capable of avoiding the problem of shortened lifespan due to wear of the contacts in the electromagnetic switch.
The three-phase SSR is divided into an SSR main body, a control circuit that controls on and off of the SSR, and an absorber circuit that protects the SSR main body from surge voltage, etc. (=J-circuit section). The purpose of the present invention is to provide a three-phase solid-state relay that is extremely economical and convenient because each circuit section can be replaced independently by making each circuit section removable and removable. .

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a three-phase 5SR 70 according to an embodiment of the present invention, which, as shown in FIG.
4, and controls the supply of the three-phase AC power source 62 to the motor 63 using a main circuit section 61 which is provided with three circuits similar to the main element circuit 80 shown in FIG. be.

As shown in FIG.
and an auxiliary circuit section 30, and the above-mentioned main circuit section 61 is housed in the ssR main body 10. Also this SS
Each of the above-mentioned main element circuits 80 is provided at the front and rear of the upper surface of the R main body lO.
Main terminals 11a, 12a, 13a and main terminals 11b, 1 for connecting to the three-phase cable 64 on the power supply side or load side
2b.

13b are formed to face each other, and these main terminals 11a~
13a and main terminals 11b-13b are arranged on straight lines parallel to each other. And each main terminal 11~
13, gate relay terminals 14, 15, 16 for applying control signals to each of the main element circuits 80 are arranged alternately with each of the main terminals 11 to 13. 16 are formed to protrude upward. The main terminals 11 to 13 are surrounded by a U-shaped output barrier 17 with an open outer side that separates them from each other, thereby providing an insulation distance between the main terminals 11 to 13 and the gate relay terminals 14 to 16. That is, creepage distance and spatial distance are ensured. Note that 18 and 19 are drill holes.

Further, the auxiliary circuit section 30 houses a control circuit for controlling the main element circuit 80 on and off, and an absorber circuit for protecting the main element circuit 80 from surge voltages such as those caused by lightning. A pair of input terminals 22a are provided on the side of the auxiliary circuit section 30 for inputting control signals to the control circuit.
, 22b are disposed, and three pairs of output terminals 23, 24, 25 of the control circuit and terminals 32, 33, 34 of the absorber circuit are disposed facing each other at the front and rear, respectively. And the output terminal 23 of the control circuit
25 are formed with holes 43, 44, 45 for connecting the terminals 23 to 25 and the gate relay terminals 14 to 16 of the SSR main body 10, and the absorber terminals 32 to 34 are The main terminals 11 of the S S and R main bodies 10 as well as the three-phase cables 64 on the power supply side and the load side
~13. Note that 35 is a mounting hole for mounting this accessory circuit section 30 to the SSR main body 1o.

Next, the effects will be explained.

First, when assembling this three-phase 5SR70, connect the attached circuit section 30 to its control signal input terminal 22. The control signal output terminals 23 to 25 and the absorber terminals 32 to 34 are each S
SR body 10 screw hole 19° gate relay terminal 14-16
And the above SS in the position of main terminals 11 to 13.
It may be placed on the R main body 1o and fixed with screws 40 using the mounting holes 35 and screw holes 18.

In use, a control signal line from the outside is connected to the control signal input terminal 22, and a three-phase cable 64 on the power supply side and the load side is connected to the absorber terminal 3'2a located above the main terminals 118 to 13a. ~34a, or the above main terminal 1
Absorber terminals 32b~ positioned on 1b~13b
34b, respectively.

According to the device of this embodiment, the supply of the three-phase AC power supply 62 to the load 63 is performed by the non-contact type semiconductor main element circuit 80, so that it can be used in situations where frequent switching is performed. Sufficient durability and longevity can be obtained even under low conditions.

Furthermore, since the SSR main body 10 and the attached circuit section 30 are mutually detachable, even if one of them fails, it is only necessary to replace the failed one, which is economical. Furthermore, the attached circuit section 30 can be replaced with one whose control path has, for example, a phase control function and a timer function, and whose absorber circuit has a capacity corresponding to the load. Very convenient.

〔Effect of the invention〕

As described above, according to the present invention, the supply of three-phase AC power to the load is performed by the three-phase SSR made of semiconductors, so that it can be used even under usage conditions where frequent switching is performed. , durable enough.

It has a long service life, and since the SSR main body and attached circuit section of the 3-phase SSR are constructed separately and can be attached and detached from each other, each circuit section can be replaced independently, making it economical for non-seat users. This has the effect of providing a convenient three-phase solid state relay.

[Brief explanation of the drawings] Figure 1 is a circuit diagram of the semiconductor main element circuit of a single-phase SSR;
The figure is an exploded perspective view of a three-phase SSR according to an embodiment of the present invention.
FIG. 3 is a diagram showing the state of use of this three-phase SSR. 10...SSR main body, 30...attached circuit section, 8o.
...Semiconductor main element circuit. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] (1) A solid-state relay body having a semiconductor main element circuit for discontinuing the supply of three-phase AC power to a load, and a solid-state relay body that is detachably attached to the solid-state relay body and that connects the semiconductor main element circuit from the outside. A three-phase solid state relay comprising: a control circuit that performs on/off control in response to a control signal; and an auxiliary circuit section having an absorber circuit that protects the semiconductor main element circuit from abnormally high voltage.