A single-phase power switch control circuit and an AC power supply system having the same

Abstract

The present invention provides a single-phase power switch control circuit and an AC power supply system having the same, wherein the single-phase power switch control circuit includes: an optocoupler control unit, a constant current source charging unit, and a drive protection circuit; the optocoupler The control unit is used to control the on-off of the optocoupler through the AC signal drawn on the AC bus, and then control the start and stop of the constant current source charging unit; the constant current source charge and discharge unit is used to send The signal of the energy storage device C is charged and discharged, and the energy storage device C forms an oscillation circuit with the primary side of the transformer and the bidirectional trigger diode, thereby generating a driving pulse on the secondary side of the pulse transformer; the driving protection circuit is used to The driving pulse signal sent by the charging power source of the constant current source is controlled within the effective working range of the subsequent circuit. Adopting the present invention can not only greatly reduce the cost of the AC switch, but also reduce the probability of misoperation of the AC switch.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-phase power switch control circuit and an AC power supply system with the circuit. Background technique [0002] In the existing industrial fields applied to thyristors, programmable logic devices are usually used in conjunction with peripheral circuits and power supplies to drive thyristors, so that thyristors can be used as AC switches. [0003] However, during the design process of the existing thyristor AC switch, the inventor found at least the following problems in the prior art: [0004] In the prior art, the cost of realizing the AC switch through the programmable logic device, the peripheral circuit and the power supply used in conjunction with it is relatively high, and the program design for controlling the programmable logic device is relatively complicated, so that the probability of misoperation of the AC switch is high. . Contents of the inven...

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Problems solved by technology

[0004] In the prior art, the cost of realizing the AC switch through the programmable logic device, the peripheral circuit and the power supply used in conjunction with it is relatively high, and the program design for controlling the programmable logic device is relatively complicated, so that the probability of misoperation of the AC switch is high.

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