Thyristor triggering system based on isolated power supply and triggering method thereof

Abstract

The invention discloses a thyristor triggering system based on an isolated power supply and a method thereof. The thyristor triggering system based on the isolated power supply comprises at least onetriggering circuit, the triggering circuit comprises a power supply end Vin+ and a power supply end Vin-, an isolation power supply 1, a high-speed optocoupler 1 and a thyristor 1, the power supply end Vin+ and the power supply end Vin- are electrically connected with the input end of the isolation power supply 1 independently, and the isolation power supply 1 comprises an output end V1+ and an output end V1- which are isolated. According to the thyristor triggering system based on the isolated power supply and the method thereof, the isolated power supply and the high-speed optocoupler are used for replacing a triggering transformer, the size is smaller, and the cost is lower; and the continuous current triggering mode can be rapidly conducted during current reversing, and the pulse arraymode can be conducted only after a pulse low-level time; and the control logic is simpler and can be realized by one common GPIO port.

Description

technical field [0001] The invention belongs to the technical field of thyristor triggering, and in particular relates to a thyristor triggering system based on an isolated power supply and a thyristor triggering method based on an isolated power supply. Background technique [0002] The existing technical solution: drive the trigger transformer with a power triode, generate a pulse array to trigger the thyristor, and realize the isolation of the control terminal and the AC power supply terminal of the thyristor through the trigger transformer. [0003] Disadvantages of this scheme: [0004] 1. To obtain a higher trigger current, the requirements for the trigger transformer are very high, the volume is large and the cost is high [0005] 2. Due to the gap between the pulses of the pulse array, there will be an off state that is as long as the duration of the pulse low level when the current zero crosses and commutates, which is not possible in applications that require high...

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Problems solved by technology

[0004] 1. To obtain a higher trigger current, the requirements for the trigger transformer are very high, the volume is large and the cost is high

[0005] 2. Due to the gap between the pulses of the pulse array, there will be an off state that is as long as the duration of the pulse low level when the current zero crosses and commutates, which is not possible in applications that require high current waveforms accepted

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