Views:3 Author:Site Editor Publish Time: 2020-08-29 Origin:Site
Nominal voltage is the maximum voltage that can be continuously loaded on the capacitor, also known as withstand voltage. That is, the voltage when the electrical appliance is working normally. To
If the rated voltage of the capacitor is high, it is easy to burn out, and if it is low, it will not work normally (the light bulb is not normally lighted, and the motor is not running normally). At this time, the components in the electrical appliance are all working in the best condition. Only when they are working in the best condition, the performance of the electrical appliance is relatively stable, so that the life of the electrical appliance can be extended.
Long-term in the state close to the rated voltage is a very high capacitor, will shorten the life of the product.
The usual practice in the capacitor industry is to "choose a capacitor with a withstand voltage twice the power or signal voltage."
Capacitors with a rated voltage of several hundred volts include aluminum electrolytic capacitors, film capacitors, and chip multilayer ceramic capacitors. Aluminum electrolytic capacitors and film capacitors have been introduced with high rated voltages and large electrostatic capacitance.
Compared with the above three types of capacitors, tantalum electrolytic capacitors have a lower rated voltage, and the usual upper limit is only tens of volts.
When capacitors are used in power lines and other occasions, they will not only be loaded with a certain voltage, but may also be loaded with high voltage for some reasons. For example, pulse-like voltages such as overshoots and spikes caused by the parasitic inductance of the circuit are called abnormal capacitor voltages.