Views: 3 Author: Site Editor Publish Time: 2022-07-20 Origin: Site
The rated voltage of the capacitor (Nominal voltage) is the large voltage that can be continuously loaded on the capacitor, also known as the withstand voltage. That is, the voltage at which the electrical appliance is working normally.
If the rated voltage of the capacitor is high, it is easy to burn out, and if it is low, it does not work properly (the light bulb does not glow normally, and the motor does not operate normally).At this time, the components in the electrical appliance are all working in the state, and the performance of the electrical appliance is relatively stable only when it is working in the state, so that the use time of the electrical appliance can be prolonged.
In the state close to the rated voltage for a long time, the use time of the product will be shortened.
The common practice in the capacitor industry is to "choose a capacitor with a withstand voltage that is twice the power supply or signal voltage".
Capacitors rated up to 100 volts include aluminum electrolytic capacitors, film capacitors and chip multilayer ceramic capacitors. Aluminum electrolytic capacitors and film capacitors have been introduced with high rated voltage and large electrostatic capacity.
Compared with the above three types of capacitors, tantalum electrolytic capacitors have a lower rated voltage, and the upper limit is usually only tens of volts.
When the capacitor is used in power lines and other occasions, it will be loaded with some voltage, and may also be temporarily loaded with high voltage for some reasons. For example, pulse-like voltages such as overshoots and spikes caused by parasitic inductance components of circuits are called abnormal capacitor voltages.