The right high voltage capacitor selection method

When selecting a capacitor, how do we correctly select a high voltage capacitor? The value of the withstand voltage is the most appropriate. It will not cause too large or too small, and it will also save time for testing and purchase. Let the editor explain it to everyone.

1) Reasonably determine the capacity and error of high-voltage capacitors

The value of the high voltage capacitor capacity must be selected according to the specified nominal value. There are many kinds of high-voltage capacitor error levels, in the low-frequency coupling, decoupling, power supply filtering and other circuits, high-voltage capacitors can choose ± 5%, ± 10%, ± 20% and other error levels, but in the oscillation circuit, delay circuit, In the tone control circuit, the accuracy of the high-voltage capacitor is slightly higher; in various filters and various networks, high-accuracy high-voltage capacitors are required.

2) Selection of pressure resistance

In order to ensure the normal operation of the high-voltage capacitor, the high-voltage capacitor is not only higher than its actual operating voltage, but also has enough room for high-voltage capacitors. Generally, high-voltage capacitors with a withstand voltage of more than twice the actual operating voltage are used.

3) Pay attention to the temperature coefficient of the high-voltage capacitor, high-frequency characteristics and other parameters

In the oscillating circuit, the oscillating element, the phase-shifting network element, the filter, etc. should use a high-voltage capacitor with a small temperature coefficient to ensure its performance. In high-frequency applications, the performance of high-voltage capacitors deteriorates due to the influence of high-voltage capacitors' own inductance, lead inductance, and high-frequency losses.