Precautions for the selection of metal film capacitors | Focus on mid-to-high-end brand capacitor manufacturers

The selection of metal film capacitors depends on the highest applied voltage, and is related to factors such as voltage waveform, current waveform, frequency, and ambient temperature. 1. Rated voltage of metal film capacitor: refers to the peak value of the highest DC voltage or pulse voltage that can be continuously applied to the metal film capacitor within the rated temperature range. Taking into account the reliability and derating requirements, it is usually required that the actual working voltage should be less than 80% of the rated voltage value. 2. Working current selection of metal film capacitors: Due to the loss of capacitors, when used under high frequency and high pulse conditions, the current passing through the capacitor will cause the capacitor to heat itself, and in severe cases, there will be thermal breakdown, etc. (smoke, Fire), so the use is also limited by the rated current of the metal film capacitor. Generally, the single pulse current and continuous current of the capacitor are given in the specification. When using, it must be ensured that both of these currents are within the allowable range. If it is not possible to determine the corresponding relationship between the actual working current waveform and the waveform in the specification, the temperature rise of the metal film capacitor can be used to determine it. Generally, for polyester capacitors, the temperature rise is allowed to be used under the condition of less than 10C. For polypropylene capacitors, they are allowed to be used when their own temperature rise is less than 5C. (The actual measurement should be performed on the surface of the lead welding part of the capacitor end face) For more information, please call the toll-free hotline: 4006299138.

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