JPH0320918A - Closing gear - Google Patents

Abstract

PURPOSE:To simplify maintenance works, lower the cost, and to make handling easy by making a block of semiconductor switching devices a cartridge and enabling the cartridge to be attached and detached freely. CONSTITUTION:Cartridges 7A, 7B, 7C are inserted respectively into insert holes 16A, 16B, 16C and thus cartridges 7A, 7B, 7C are installed in a relay main body 1 side. Then, when input signals are put in input terminals 3A, 3B, triac 11 of each phase is driven by a triger circuit 32 and load connected to each phase load terminal 4A, 4B, 5A, 6A, 6B is switched.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a switching device applied to a solid state relay or the like having a semiconductor switching element corresponding to three-phase or multi-phase load terminals.

Conventional technology and issues> Conventionally, this type of device, for example a solid state relay, has multiple input terminals and three
Some devices are provided with load terminals for each phase, and further include a plurality of semiconductor switching elements for switching loads corresponding to the load terminals of each phase, a circuit for driving the switching elements, and the like.

In such a three-phase integrated solid-state electric appliance, among the three phases,
If the semiconductor switching element of even one phase is destroyed, the entire relay body must be replaced, which increases costs.

Additionally, all wiring must be removed during maintenance, which is time-consuming and may lead to short circuits due to wiring errors.

Furthermore, if you try to prepare a 3-phase 3-wire system and a 3-phase 2-wire system, the number of parts will increase, making management difficult. Furthermore, if there is a method of use that requires a large input current, such as reversible operation of a motor, it is necessary to select a model with a large capacity for safe use of semiconductor switching elements.
This requires a large installation space and is disadvantageous in terms of cost.

OBJECT OF THE INVENTION This invention has been made to eliminate the drawbacks of the above-mentioned conventional devices, and aims to provide a switchgear that can simplify maintenance work and reduce costs, and is easy to handle. .

Structure and Effects of the Invention A switchgear according to the present invention has one or more input terminals provided on the device main body, and a plurality of input terminals corresponding to each of three or multiple phases provided on the device main body. and a plurality of semiconductor switching elements that are connected between the load terminals of each phase and open/close between the load terminals of each phase according to an input signal applied to the input terminal, and each of the semiconductor switching elements The block is configured as a cartridge that is removably attached to the main body of the device. According to this invention, a block of semiconductor switching elements is made into a cartridge and can be detached from the main body of the device, so that only the semiconductor switching element of a failed phase can be replaced.Therefore, costs can be reduced and there is no need to remove wiring. Since there are no cables, the risk of wiring mistakes can be eliminated.
Furthermore, if the semiconductor switching element is made into a short-circuit cartridge, it becomes easy to adapt to 3-phase 3-wire type and 3-phase 2-wire type, and the input current can be increased by simply converting only the semiconductor switching element to a high-capacity type. It can also be used in large usage situations.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a perspective view and a plan sectional view of essential parts, respectively, showing an example in which the switching device according to the present invention is applied to a solid state relay.

In the figure, 1 is a relay main body, and 2 is a heat sink fixed to the relay main body 1. 3A. 3B is a pair of human power terminals for applying human power signals, 4A. 4B, 5A, 5B and 6A, 6B are three-phase load terminals with one pair as one set,
It is provided on the front side of the relay body 1 together with the human power terminals 3A and 3B.

7 (7A, 7B, 7C) are cartridges of semiconductor switching element blocks corresponding to each phase, and each cartridge 7 has a heat sink base 8 that contacts the heat sink 2.
, a first anode electrode piece 10 (IOA, IOB
, IOC), a triac 11 (IIA, IIB, IIC) as an example of a semiconductor switching element connected to the first anode electrode piece 10 (FIG. 3). Second anode't pole piece 12 (12A, 12B, 12C)
and gate electrode pieces 13 (13A, 13B, 13
C) and the like. First and second anode electrode pieces 10. 12 and the tips of the gate electrode pieces 13 protrude from the rear surface of the cartridge 7, and 15 (15A, 15B, 15C) are input signal connection terminals held in the cartridge 7 (7A, 7B, 7C), respectively. It forms part of the input circuit described later.

Reference numerals 16 (18A, 18B, 18C) are insertion holes formed on the front side of the relay main body 1 to hold the cartridges in a removable manner. At the rear of each insertion hole 16,
Anode electrode sockets 17A are connected in parallel to each set of load terminals 4A, 4B, 5A, 5B, 6A, and 6B, and into which the tips of the first and second anode electrode pieces 10.12 of the cartridge 7 are inserted. ,17B%18A
, 18B, 19A, 19B, and gate electrode sockets 20A, 20B, 20C (FIG. 3) into which the tips of the gate electrode pieces l3 of each cartridge 7 are inserted.

Reference numeral 21 denotes a printed wiring board housed in the relay main body 1, and is used for circuit components to be described later, such as the gate resistor 22 (22A, 22B, 2) of the triac 1l.
2C) etc. are set.

23A, 23B, 24A, 24B, 25A,
25B is an input signal connection terminal socket provided in the relay main body 1, and is connected to the cartridges 7A, 7B, and 25B, respectively.
The input signal connecting terminals 15A, 15B, and 15C of 7C are configured to be short-circuited so as to be openable to each other.

26A, 26B, 27A, 27B, 28A,
28B are holes into which the input signal connection terminals 15A, 15B, 15C of the cartridges 7A, 7B, 7C are inserted, respectively.

Figure 3 shows a 7R circuit example of a solid state relay. 31
Reference numeral 32 indicates an input circuit, 32 is an l-trigger circuit for driving the above-mentioned triax l1 by an input signal applied to the input circuit 3I, and 33 is a snare circuit for triax protection. The input path 3l includes light emitting elements 35A.
35B, 35C, and the human power signal connection terminal +5A.
15B, 15C and the above sockets 23A, 23B
, 24A. 24B, 25A. 25B. The trigger circuit 32 connects each light emitting element 35A . 35B
．． 35C and photocabura 36A. 36B,
The light-receiving element that prints 36C. 37}3.
37C, resistors 38A, 38B, 38C, and the gate resistors 22A, 22B, 22C. In addition, the snap circuit 33 has a resistor 39A. 39B,
39C, capacitors 40A, 40B. 40C and varistor 41A. 41B and 41C.

In the above configuration, cartridge 7A. 7B. 7C into the insertion holes 16A, 16B, 16C of the relay 1, these cartridges 7A, 7
B and 7C are attached to the relay main body 1 side. That is, taking the cartridge 7B as an example, the anode electrode socket 18A. The first and second anode electrode pieces 10 are attached to 18B.
The tips of the electrodes B and 12B are inserted and electrically connected, and the gate electrode piece 13B is inserted into the gate electronic socket 20B and electrically connected. Further, the human power signal connection terminal 15B is connected to the human power signal connection terminal socket 2.
It is inserted into 4A and 24B. All of the above cartridges 7A. 7B, 7C are installed, each input signal connection terminal socket 23A. 23B, 24A
, 24B, 25A, and 25B are short-circuited to each other and connected to the input circuit 3l.

When an input signal is applied to the input terminals 3A and 3B, the triax 11 of each phase is driven by the trigger circuit 32, and the loads connected to the load terminals 4A, 4B, 5A, 5B, 6A, and 6B of each phase are opened and closed. It will be done. Here, the semiconductor switching element blocks 14 of each phase are attached to the relay main body 1 in a removable cartridge 7A. 7B,
Since it is configured as 7C, even if one of the three phase semiconductor switching elements 11 fails, there is no need to replace all the semiconductor switching elements 1l, and only the failed one needs to be replaced, resulting in lower costs. In addition, there is no need to remove the wiring inside the relay main body 1 during maintenance, so it is possible to prevent the risk of incorrect wiring and short-circuit accidents between phases. Furthermore, if the above-mentioned cartridges 7A, 7B, and 7C are used as short-circuit cartridges, it becomes possible to use a three-phase two-wire system. In other words, both the 3-phase 3-wire and 3-phase 2-wire series can be expanded, making management easier, and reducing costs by sharing parts. Furthermore, even if the model cannot be used in situations where a large current is applied, it can be used as a model with a higher rating by converting only the cartridges 7A, 7B, and 7C to ones with a larger capacity. In the above example, a three-phase solid state relay has been described as an example, but a multi-phase relay can also have the same effect.

Further, the semiconductor switching element 11 is not limited to a triax, but may be a thyristor, for example.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a perspective view and a plan sectional view of essential parts, respectively, showing an example in which the switching device according to the present invention is applied to a solid state relay, and FIG. 3 is an electric circuit diagram of the same solid state relay. 1...Device body, 3A, 3B...Manual terminal, 4A,
4B, 5A, 5B, 6A, 6B...Load terminal, 7A,
7B, 7C...Cartridge, 11...Semiconductor switching element.

Claims (1)

[Claims] (1) Connections between one or more input terminals provided on the device main body, multiple pairs of load terminals provided on the device main body corresponding to 3-phase or multi-phase, and the load terminals of each of the above phases. and a plurality of semiconductor switching elements that open and close between the load terminals of each phase according to an input signal applied to the input terminal, and the block of semiconductor switching elements of each phase is removably attached to the main body of the apparatus. An opening/closing device characterized in that it is configured as a cartridge to be installed.