Triggering device and method for silicon controlled rectifier in single-phase alternating current circuit

Abstract

The invention relates to the field of electricity, and especially relates to a triggering device and method for a silicon controlled rectifier in a single-phase alternating current circuit. The triggering device comprises a sine wave positive and negative zero crossing point detection circuit, a first trigger control circuit, a second trigger control circuit and a trigger signal generation circuit. A sine wave positive and negative zero crossing point detection circuit is used for collecting a zero crossing point signal of the output end of the single-phase alternating current circuit, and outputting a first detection signal when the negative half wave of the voltage is gradually reduced to the positive half wave is gradually increased and a second detection signal when the positive half wave of the voltage is gradually reduced to the negative half wave is gradually increased; the first trigger control circuit converts the first detection signal into a first trigger control signal, and the second trigger control circuit converts the second detection signal into a second trigger control signal; and the trigger signal generating circuit converts the first trigger control signal and the second trigger control signal into silicon controlled rectifier trigger signals. According to the invention, stable triggering of the silicon controlled rectifier in the single-phase alternating current circuit can be realized without using an intelligent chip.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a trigger device and method for a thyristor in a single-phase AC circuit. Background technique [0002] Currently, when realizing the triggering of the thyristor and the adjustment of the conduction angle in the single-phase AC circuit, the method adopted is: firstly, the smart chip or smart device is used to detect the zero-crossing signal in the single-phase AC circuit through a complex detection circuit, The trigger angle is calculated based on the signal, and then the trigger angle is converted into a delay time, and then the high-precision timing circuit is used for precise timing. If the delay time is reached, a control signal is generated, and the drive circuit uses the control signal to trigger the single-phase AC. SCR in the circuit. [0003] Based on the above, in order to ensure the stable triggering of the thyristor in the single-phase AC circuit and the precise adjustment...

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Problems solved by technology

[0003] Based on the above, in order to ensure the stable triggering of the thyristor in the single-phase AC circuit and the precise adjustment of the conduction angle, it is necessary to use a smart chip or smart device, and in order to ensure the stable operation of the smart chip or smart device, it is necessary to add an additional Advanced detection signal processing circuit, drive circuit and anti-interference circuit, which makes the overall structure of the system complex, high cost and low stability

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