JPH0321081Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is a 3-phase solid state relay (hereinafter referred to as 3-phase
(hereinafter referred to as phase 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), which use semiconductors and are non-contact, 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.

Figure 1 shows the semiconductor main element circuit 80 of the single-phase SSR mentioned above.
In the figure, 81 and 82 are power supply side and load side main terminals, 83 and 84 are first and second thyristors, 85 and 86 are control terminals connected to a control circuit (not shown), and 87 and 88 are respectively These are first and second gate auxiliary circuits consisting of a resistor 89 and 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 half 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 using the control signal.

In such conventional situations, when controlling the supply of the three-phase AC power to the load, the single-phase SSR described above is used in combination with the electromagnetic switch instead of the three-phase AC power source.
It is believed that by configuring an SSR, it is possible to avoid the above problem of reduced lifespan.

[Summary of the idea]

The purpose of this invention is to provide a three-phase SSR that can avoid the problem of shortened service life due to wear of the contacts in the electromagnetic switch in the conventional situation, and that is easy to assemble.

That is, this invention includes three semiconductor main element circuits for connecting and disconnecting the supply of three-phase AC power to the load;
A three-phase SSR comprising a control circuit that controls on/off the circuit according to an external control signal,
A recess is provided in the center of the upper surface of the main element storage case that houses the semiconductor main element circuit, control terminal leads of the semiconductor main element circuit are implanted in the periphery of the upper surface of the main element storage case, and control terminal leads are installed on the lower surface of the control circuit. The lead is made to protrude substantially parallel to the lower surface, and the control circuit is placed in the recess of the main element storage case.
By fitting the control lead into the output terminal lead and soldering it, the soldering and positioning work can be easily performed.

[Example of idea]

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

2 to 7 show a three-phase SSR according to an embodiment of the present invention. In Fig. 2, 1 is a 3-phase AC power supply, 2 is a 3-phase AC motor which is a load, 3 is a 3-phase cable connecting the 3-phase AC power supply 1 to the 3-phase AC motor 2, and 4 is the 3-phase cable 3. This is a 3-phase SSR installed in the middle.

B Also, Figures 3, 4 and 5 are 3-phase SSR
5 shows the specific structure of the 3-phase AC power supply 1 and 3.
Three sets of semiconductor main element circuits (see FIG. 1) 6 that connect and disconnect the supply of electricity to the phase alternating current motor 2;
SSR main body, 7a to 7c, and 7, consisting of a control circuit 8 that performs on/off control according to control signals from
d to 7f are the main terminal boards of the semiconductor main element circuit 6 for connecting the power supply 1 (or motor 2) and each line of the 3-phase cable 3 from the motor 2 (or power supply 1), and 9 is mounted on the SSR main body 5 main semiconductor element 6
This is an absorber circuit that protects the device from abnormal high voltages such as surge voltages.

Therefore, as shown in FIG. 5, the SSR main body 5 has the control circuit 8 mounted in the recess of the main element storage case 51, and the control terminal leads 12a to 1 of the control circuit 8.
The control circuit 8 is mounted and connected on the main element storage case 51 by fitting the control terminal lead 13 of the main element circuit into the 2h through hole and soldering it, and the absorber circuit 9 is mounted on the SSR main body 5. It is installed.

6 and 7 show the detailed structure of the control circuit 8, 10 is a case that houses the control circuit 8, 11 is a resin that seals and fixes the control circuit 8 in the case 10, and 12a and 12b are Input terminal leads 12c to 12h to which external control signals are applied are output terminal leads soldered to the control terminal leads 13 of the semiconductor main element circuit 6;
12h are arranged facing each other near the center of the case 10 and fixed by the resin 11,
Further, the leads 12c to 12f are bent toward both sides of the case 10, and the leads 12c to 12f are bent toward both sides of the case 10.
It protrudes to the outside through 0a.

Next, the assembly method will be explained. When assembling this device, the semiconductor main element circuit 6 of the SSR main body 5
A control circuit 8 is placed on top, and the control terminal leads 13 of the semiconductor main element circuit 6 are fitted into the through holes of the output terminal leads 12c to 12h of the control circuit 8, and both are soldered using a soldering iron 14. do it.

In the device of this embodiment having the above configuration,
Since we configured a 3-phase SSR using semiconductors to control the supply of 3-phase AC power to the load,
This solves the problem of reduced lifespan due to contact wear.

In addition, in such a three-phase SSR, first,
It is conceivable to make the output terminal leads of the control circuit protrude straight downward and solder them to the control terminal leads of the semiconductor main element circuit, but this method makes it difficult to apply the soldering iron and the soldering work is difficult. The problem arises that it becomes very complicated. However, in this device, the output terminal lead of the control circuit is made to protrude from the outer wall of the case, so it is very easy to solder the output terminal lead and the control terminal lead, and alignment during assembly is also very easy. It is.

[Effect of idea]

As described above, according to the present invention, a three-phase SSR is configured by three semiconductor main element circuits, and a recess is provided in the center of the upper surface of the main element storage case for storing the semiconductor main element circuits, and the upper surface of the main element storage case is The control terminal leads of the semiconductor main element circuit are planted on the peripheral edge of the main element storage case, and the control terminal leads are projected from the lower surface of the control circuit so as to be substantially parallel to the lower surface, and the control circuit is placed in the recess of the main element storage case. Since the control terminal lead is inserted into the output terminal lead, it not only solves the short life problem of conventional electromagnetic switches, but also makes it easier to solder and align the control terminal lead of the control circuit. This has the effect of simplifying the work and making the assembly work very simple.

[Brief explanation of drawings]

Figure 1 is a circuit configuration diagram of a conventional single-phase SSR semiconductor main element circuit, and Figure 2 is a circuit diagram of a semiconductor main element circuit of a conventional single-phase SSR.
Figures 3 and 4 are circuit diagrams showing the connection relationship with the power supply and load when the phase SSR is in use.
The top view and side view of the SSR, Figure 5 is the 3-phase SSR mentioned above.
Figures 6a to 6c are exploded perspective views of the main parts of the above three-phase SSR.
FIG. 7 is a bottom view, a cross-sectional side view, and a cross-sectional front view of the control circuit, and FIG. 7 is a perspective view of essential parts showing the assembled state of the three-phase SSR. 6... Semiconductor main element circuit, 8... Control circuit, 1
0...Case, 12c~12h...Output terminal lead. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] Three semiconductor main element circuits that disconnect and disconnect the supply of three-phase AC power to a load, and a control circuit that turns on and off each of the main element circuits in response to external control signals. A three-phase solid-state relay comprising: a recess provided in the center of the upper surface of a main element storage case for storing the semiconductor main element circuit; A terminal lead is planted, the control terminal lead is projected from the bottom surface of the control circuit so as to be substantially parallel to the bottom surface, and the control circuit is placed in the recess of the main element storage case, and the output terminal A three-phase solid state relay comprising the control terminal lead inserted into the lead.