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Analyze The Reason Why The Safety Capacitor is Broken on the Power Circuit Board(1) - News

Analyze The Reason Why The Safety Capacitor is Broken on the Power Circuit Board(1)

366 Published by Selina Jiang at May 26,2021

Analyze The Reason Why The Safety Capacitor is Broken on the Power Circuit Board(1)

 

1: The short circuit inside the capacitor is damaged, and the fault phenomenon is the burning of the switching tube and other current-limiting components, such as the current-limiting resistor in the insurance and switching power supply.

Short capacitance, broken circuit damage filter capacitor working in high voltage, high current (such as color TV switching power supply, line output circuit), when the voltage rises for some reason, and exceeds its withstand voltage value, it will break down Short-circuit damage, or due to the damage of the rectifier diode, the electrolytic capacitor with polarity is equivalent to working in an AC circuit, heating under a large reverse leakage current and short-circuit damage.

Due to the large current flowing through the capacitor during a short circuit, the capacitor will burst or its sealing rubber plug will bulge out.

After the filter capacitor is short-circuited, faults such as the fuse or current limiting resistor blown, the thick film block of the power supply or the switch tube, the rectifier tube breakdown, etc. often occur.

Mainly manifested as the "three nos" of the whole machine, this kind of failure has commonality in various switching power supplies.

 

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