Power driving circuit

Abstract

The invention discloses a power driving circuit. The circuit comprises: a photocoupler, a first thyristor loop, and a second thyristor loop, a first input pin of the photocoupler is connected with a constant voltage power supply, a second input pin of the photocoupler is connected with a control signal and used for generating two channels of driving signals according to the control signal and outputting the driving signals from a first output pin and a second output pin of the photocoupler, the first output pin of the photocoupler is connected with a gate electrode of the first thyristor loop, the second output pin of the photocoupler is connected with a gate electrode of the second thyristor loop, an anode of the first thyristor loop and a cathode of the second thyristor loop are connected with an input terminal of a three-phase alternating current power supply, and a cathode of the first thyristor loop and an anode of the second thyristor loop are connected with an output terminal of the three-phase alternating current power supply. According to the power driving circuit, the photocoupler is employed to trigger thyristors, and the trigger circuit is simple and reliable.

Description

technical field [0001] Embodiments of the present invention relate to aviation electrical technology, and in particular to a power drive circuit. Background technique [0002] The thyristor has the characteristics of a silicon rectifier device, can work under high voltage and high current conditions, and its working process can be controlled, and the trigger circuit is simple, so it is widely used as an AC non-contact switch to drive AC high-power loads, and the thyristor is suitable for use in In the power drive circuit of the propeller sequential heating controller. [0003] The commonly used thyristor trigger circuit and the main circuit are connected with high-power electricity, which is easily affected by grid voltage fluctuations and power waveform distortion. At the same time, in order to solve the synchronization problem, the related circuits are also relatively complicated. Contents of the invention [0004] The invention provides a power driving circuit to reali...

AI Technical Summary

Problems solved by technology

[0003] The commonly used thyristor trigger circuit is connected to the main circuit due to the connection of high-power electricity, which is easily affected by the fluctuation of the grid voltage and the distortion of the power waveform. At the same time, in order to solve the synchronization problem, the related circuits are also relatively complicated.

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