The use of capacitors(3)

Filtering: in the power supply circuit, the rectifier circuit changes the AC into pulsating DC, and after the rectifier circuit, connecting an electrolytic capacitor with a large capacity can take advantage of the charge-discharge characteristics to change the pulsating DC voltage after rectifying into a relatively stable DC voltage. In practice, in order to prevent the power supply voltage of various parts of the circuit from changing due to load changes. Therefore, in the output of the power supply and the load of the power input, there are generally tens to hundreds of micro-process electrolytic capacitors. Because of the large capacitance of electrolytic capacitors generally have a certain inductance. The interference signals of high frequency and pulse cannot be filtered effectively, so a capacitor with a capacity of 0.001-0.LpF is connected in parallel at both ends of the capacitor to filter out the interference of high frequency and pulse.