A controllable silicon compound switch with protection device

A composite switch and protection device technology, applied in electronic switches, electrical components, reactive power compensation, etc., can solve the problems of thyristor shutdown short circuit, fault, etc., to avoid short circuit fault, reduce damage rate, and improve work efficiency. Effect

Inactive Publication Date: 2008-02-20
NANNING MICRO CONTROL HIGH TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a thyristor composite switch with a protection device, which can solve the problem that the thyristor should be turned off but fails to turn off due to the out-of-control of the single-chip microcomputer and the short-circuit fault occurs

Method used

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  • A controllable silicon compound switch with protection device
  • A controllable silicon compound switch with protection device
  • A controllable silicon compound switch with protection device

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing, the present invention will be further described.

[0023] As shown in Figure 1: The circuit of the thyristor composite switch with a protection device includes thyristors and relays. It is a monostable circuit connected in series between the single-chip microcomputer system and the thyristor trigger circuit. After the circuit, the thyristor element is connected, the thyristor element is connected to the power capacitor, and the two ends of the thyristor element are connected to the relay contacts; one end of the relay is also connected to the single-chip microcomputer system.

[0024] It can be known from the schematic circuit diagram of the present invention shown in FIG. 2 that the monostable circuit is composed of a diode D, a capacitor C1, a resistor R, and Schmidt circuits G1 and G2. Among them, the cathode of the diode D and one end of the capacitor C1 are connected to the SCR control output terminal 1 of the single-...

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Abstract

The utility model discloses a thyristor combination switch with a protection unit; wherein, a monostable circuit is connected in series between the thyristor trigger signal output circuit and the power trigger circuit of the thyristor combination switch of the single chip system. With the protection unit, even if the output of the single-chip microcomputer is out of control, the overtime break-over does not occur in the trigger circuit, which obviates the possible short circuit fault incurred by the over-time break-over; therefore, the thyristor and the load of the silicon, more particularly the safety of the capacitive load and the power network, are protected effectively; thus, the reliability of the combination switch is improved, the damage rate is reduced, and the work efficiency and the economic benefit are enhanced.

Description

technical field [0001] The invention relates to a capacitive switch for reactive power compensation in a power system, in particular to a backup protection device for instantaneous conduction of a thyristor. Background technique [0002] SCR is also called thyristor, which has simple structure, convenient control and low price. As long as the corresponding voltage is applied to the positive and negative poles, and a conduction trigger signal is applied to the control pole, the positive and negative poles can be turned on and current will flow. In particular, as long as there is a conduction trigger signal on the control pole of the bidirectional thyristor, the two poles will conduct, which is very convenient and reliable to use. The composite switch (also known as composite relay) composed of thyristor and relay contacts in parallel is a new type of device used for switching power capacitors. Then the relay is closed, and its contact shorts the thyristor. At this time, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H03K17/51
CPCY02E40/30
Inventor 骆武宁海涛
Owner NANNING MICRO CONTROL HIGH TECH
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