Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Why do capacitors explode? |Focus on mid-to-high-end brand capacitor manufacturers

by:Shenmao     2021-06-26
The function of the capacitor is to charge and discharge. During the process of charging and discharging, the temperature of the capacitor will increase, and high temperature thermal expansion and contraction, and molecular thermal motion will cause the pressure in the capacitor cavity to increase. Generally, the top of the capacitor bulges first. , After a certain degree of bulging, the pressure relief port ruptures, the electrolyte flows out, and the pressure is reduced. In a few cases, it may cause the pressure in the cavity to increase sharply. , The internal electrolyte and insulating layer will splash to other places, and may even cause a secondary short circuit and cause a large area short circuit and burnout. Therefore, knowing the cause of the capacitor explosion, in order to ensure the stability of the capacitor when designing the circuit, the capacitor must be tested in a high temperature environment for a long time before production, so as to ensure the quality of the capacitor. The operating temperature and applied ripple current during use must conform to the specifications of the capacitor, and the peak voltage after the superposition of the DC voltage and the ripple voltage should not exceed the rated operating voltage. For circuits that require fast and frequent charging and discharging, aluminum electrolytic capacitors should not be used, but specially designed capacitors with long life should be selected. If more than two capacitors are connected in series, ensure that the applied voltage is lower than the rated value, and a balance resistor should be connected in parallel , So that the voltage applied to each capacitor is equal.
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