Common filter capacitor failure analysis|Focus on mid-to-high-end brand capacitor manufacturers

There are many common failure causes of filter capacitors in life. Let's talk about the breakdown and leakage of filter capacitors first. After the filter capacitor is broken down and short-circuited, it will cause the low-voltage fuse to blow, the rectifier tube or the semiconductor rectifier component to burn out and other faults. When the output capacitor of the filter breaks down, the excessive current will cause the choke coil or filter resistor to overheat or burn. After the filter capacitor leaks, the rectifier tube will be overloaded and the rectifier output voltage will be reduced. In severe cases, the rectifier tube or semiconductor rectifier components may be endangered. The second is to analyze the fault of the filter capacitor open circuit or capacity reduction. When the filter capacitor is open circuit or the capacity is reduced, the rectified output voltage will be reduced a lot, causing the full-wave rectification to half-wave rectification, and the ripple voltage will increase, and The frequency is reduced from 100 Hz to 50 Hz, and the filtering effect is not sufficient at this time. Taking a TV for example, it is likely to have dark light, small grating amplitude, poor focus, insufficient image contrast, poor synchronization, or low sound.

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