Principle and application of thyristor AC switch module with zero-crossing trigger circuit

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1 Introduction Wind turbines are a special type of device whose load varies with the size of the wind. Because the wind changes very frequently, the power compensation device frequently switches different capacitors to increase the power factor. The current switching device is mechanical. Capacitor contactor, so the capacitor contactor is frequently damaged. If the thyristor AC switch module with zero-crossing trigger circuit is used instead of the original mechanical capacitor contactor, this phenomenon can be alleviated and effective. To reduce the impact of the capacitor on the grid when it is connected to the grid.

2 Principle

The main principle is to use soft switching technology. The two basic points of soft switching technology are: (1) when the voltage difference is zero, when it is turned on; (2) when the current is zero, it exits. The thyristor naturally exits when the current is zero, so naturally meets the second point. The first point can be realized by the single-chip detection, that is, when the voltage across the load circuit and the voltage across the power supply are equal, the thyristor is triggered to turn on the circuit. Figure, shown. CNWPEM.NET

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