General capacitor failure phenomena: capacitor open circuit, breakdown, leakage, breakdown after power-on

cause of issue

1. Open circuit of components

After the capacitor can be developed open circuit, there is no function of forming a capacitor. After different circuit capacitor open circuit faults occur, it depends on the specific circuit fault phenomenon. .Buzzing, etc. After the opening of the filter, the coupling capacitor of the capacitor is silently opened.

2. Component breakdown

After the capacitor breaks down, the function of the capacitor is lost. The two pins of the capacitor become a path. The direct-blocking effect of the capacitor gradually disappears. Some problems and failures occur in the DC circuit design process of the circuit, which has an important impact on the company’s information exchange and cooperative learning. Manage the real life state of work.

3. Leakage of components

The leakage of the capacitor causes the insulation performance between the plates of the capacitor to decrease, and the leakage resistance existing between the electrode plates deteriorates the performance of the capacitor through the direct current blocking, and the capacitance of the capacitor of the capacitor decreases. When the coupling capacitor leaks, it will cause the impact circuit to perform noise, which is a small capacitor failure at a relatively high failure rate, and the failure detection is difficult.

4. Breakdown after power on

After the capacitor breakdown voltage is added, it does not show that after the power is off, when the multimeter detects that it does not show breakdown characteristics, the measured DC voltage across the capacitor is zero or very low, and the performance of the capacitor is degraded.

Repair method

1. Turn on the development of internal capacitors, constantly changing components; the capacitor and the external network are connected to the open state, and re-welding.

2. Capacitor breakdown, new.

3. The development of capacitors can use leakage current and replace them with new ones.

4. Break through after the power is turned on and replace it.