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A control method for an AC solid-state power switch

A solid-state power switch, solid-state switch technology, applied in electronic switches, electrical components, pulse technology and other directions, can solve the problems of many trigger times, large voltage drop of thyristor on-state, high power consumption, etc., and achieve low power consumption. , the effect of less interference

Inactive Publication Date: 2012-02-15
SHANGHAI AVIATION ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention relates to a control method of an AC solid-state power switch, which solves the problems in the prior art such as large voltage drop when the silicon controlled rectifier is turned on, high power consumption, and many trigger times.

Method used

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  • A control method for an AC solid-state power switch
  • A control method for an AC solid-state power switch
  • A control method for an AC solid-state power switch

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Experimental program
Comparison scheme
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specific Embodiment

[0033] The specific embodiment design circuit is as follows:

[0034] Set the control signal input terminal for inputting the on / off control signal; set the isolated power supply;

[0035]A positive control switch and a negative control switch are set, the isolated power supply ground is connected to the source of the negative control switch, the AC power supply is connected to the drain of the negative control switch, and the drain of the positive control switch is grounded through the AC load;

[0036] A bidirectional voltage transient controller, a current sampling resistor and a load current polarity sampling circuit module are arranged between the positive control switch and the negative control switch. The drain of the switch is connected, the two ends of the current sampling resistor are respectively connected with the source of the positive control switch and the source of the negative control switch, and the load current polarity sampling circuit module is connected w...

Embodiment 2

[0038] Set the line voltage polarity sampling circuit module and the load current polarity sampling circuit module, the line voltage polarity sampling circuit module is connected to the AC power supply, and the line voltage polarity sampling circuit detects the AC between the input terminal Vin of the AC power supply and the ground of the AC power supply Voltage polarity (as attached figure 1 Embodiment 1), or detect the polarity of the AC voltage between the input terminal Vin of the AC power supply and the output Vout of the AC power (as attached Figure 5 Embodiment 2);

[0039] The first logic gate circuit 14 is set, the input terminal of the first logic gate circuit is connected with the load current polarity sampling circuit module, the input terminal of the first logic gate circuit is connected with the line voltage polarity sampling circuit module, and the first logic gate circuit The output end of the circuit is connected with the clock signal interface of the positi...

Embodiment 1

[0041] Embodiment 1 is a control method for an AC solid-state power switch with two logic gate circuits each having a multiplier and an adder. Embodiment 2 is a control method of an AC solid-state power switch with two logic gate circuits each having an adder.

[0042] figure 1 It is a control principle block diagram of Embodiment 1 of the present invention.

[0043] The source of the positive control switch and the source of the negative control switch are respectively connected to the load current polarity sampling circuit module, and the load current polarity sampling circuit module is respectively connected to the input terminals of two logic gate circuits, and the two logic gate circuits The output terminal of the positive control D-type flip-flop is connected with the clock signal interface of the negative-control D-type flip-flop, the AC power supply is connected with the line voltage polarity sampling circuit module, and the line voltage polarity sampling circuit modu...

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Abstract

The invention relates to a control method for an AC solid-state power switch, which comprises two back-to-back connected solid-state switch MOSFETs, a load current polarity sampling circuit, a line voltage polarity sampling circuit, a D-type flip-flop, a logic gate circuit and an isolated power supply. It is characterized in that it detects the change of the voltage polarity or current polarity of the load circuit, the D-type flip-flop latches the on / off control signal, and turns on or off two solid-state switches in sequence to connect or disconnect the power supply circuit of the AC load. The advantage of the present invention is that: by adopting the control method of the AC solid-state power switch of the present invention, the on and off control of the AC electrical load is realized, and it has one-time trigger, natural zero-crossing on and off, no electromagnetic interference, switch Features of low power consumption.

Description

technical field [0001] The invention relates to a control method of a solid-state power switch for AC electrical load control. Background technique [0002] In the current electromechanical control method and AC power distribution system, there are generally two ways to control the switching of AC electrical loads: one is through traditional electromechanical electromagnetic relays, circuit breakers, contactors or mechanical electrical switches; the other is is the use of solid state power electronic switches such as solid state relays. In the AC power supply system, in order to reduce the electromagnetic interference to the power supply system and the environment when the solid-state power switch is turned on and off, the control method is required to make the solid-state power switch turn on when the line voltage crosses zero and turn off when the line current crosses zero. function. The solid-state power switch commonly used at present is a bidirectional thyristor, equi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/687
Inventor 袁旺
Owner SHANGHAI AVIATION ELECTRIC