The figure below shows an anti-surge current circuit composed of a thyristor V and a current limiting resistor R1. At the moment when the power is turned on, the input voltage charges the capacitor C through the rectifier bridges (D1 to D4) and the current limiting resistor R1 to limit the inrush current. When capacitor C is charged to approximately 80% of the rated voltage, the inverter operates normally. The trigger signal of the thyristor is generated by the auxiliary winding of the main transformer, the thyristor is turned on and the current limiting resistor R1 is short-circuited, and the switching power supply is in a normal running state.
Figure 3 replaces the RC delay circuit
August 12, 2024
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August 12, 2024
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