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Frequently encountered problems when using film capacitors

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1. Inappropriate current selection in the range

The current in the range is improperly selected, and more positions are generated by the DC sustain and the simple harmonics. If the current value required by the essence is larger than the allowable current value of the film capacitor, the film capacitor heating effect will be formed, and the long-term high-temperature operation will cause the film capacitor to be used for a long time, and the possibility of bursting or even burning will occur. In the configuration test, the peak current of the actual demand is allowed to be measured by a dedicated current probe or another method, and then the parameters of the capacitor are mobilized. It can be configured in the power degradation test to investigate the temperature rise of the film capacitor, and to determine whether the film capacitor is suitable for selection according to the temperature rise allowable parameter of the film capacitor.


2. Improper wire connection

Improper wire connection is the key to the use of multiple parallel circuits for film capacitors. Because of the wiring method, the spacing of the traces, etc., the capacitance of each parallel film capacitor is different in the electronic circuit. It is represented by multiple parallel film capacitors, each with different temperature rises. The temperature rise of the film capacitor in some positions is too high, causing an accident of destruction. Therefore, it is necessary to properly wire and connect the parallel operation of the film capacitors, and to achieve averaging as much as possible to improve the service life of the film capacitors.


3. Exceeding the specified range voltage

Exceeding the specified range voltage, the resulting aspect is the simple harmonic part. Developers should make preliminary plans based on the configured power, input voltage, circuit topology, load permeability, and electronic circuit Q factor. After the prototype begins to reach the condition, it is essential to investigate the parameters such as the electrical peak value and series resonance of the film capacitors during the output power period to further determine whether the model and number of the film capacitors used are accurate.


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