Impulse Current Prevention Circuit of Thyristor

Published:2011/8/25 22:41:00 Author:Michel | Keyword: Thyristor, Impulse Current, Prevention Circuit | From:SeekIC

This is impulse current prevention circuit of thyristor as above.When AC power supply is connected, the power switch may be burnt and smooth communication power supply circuit flows through larger impact current.In the circuit,thyristor VS1 makes the current prevent resistance from shortcircuit.The repeating/broken thyristor can work reliably and there is no necessary to worry about the contact's life problem. The delay time is determined by resistance R2 and capacitance C1. If diodes VD3 ~ VD6 and smooth capacitance C2 are ignored ,impact current will be IP≤UP/R1=35.9A.Current limiting resistor R1 value is larger,the impulse current peak is smaller and but charging time of smooth capacitance grows longer.



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