The role of capacitor

Capacitors are mainly used in AC circuits and pulse circuits. In DC circuits, capacitors generally play the role of blocking DC. Capacitors neither generate nor consume energy and are energy storage components. Capacitor is an important component for improving power factor in power systems; in electronic circuits, it is the main component for achieving oscillation, filtering, phase shift, bypass, coupling and other functions.

Capacitor plays four functions in the circuit: decoupling, bypass, energy storage, and filtering. Capacitors are mainly used in AC circuits and pulse circuits. In DC circuits, capacitors generally play the role of blocking DC. Capacitors neither generate nor consume energy and are energy storage components. Capacitor is an important component for improving power factor in power systems; in electronic circuits, it is the main component for achieving oscillation, filtering, phase shift, bypass, coupling and other functions. The loads used in industry are mainly motor inductive loads, that is, only capacitive loads can be used for grid balancing.

In addition, capacitors also have the following functions:

1. DC blocking: The function of capacitors is to prevent DC from passing through and allow AC to pass through.

2. Bypass (decoupling): Provides a low-impedance path for certain parallel components in the AC circuit. A bypass capacitor is an energy storage device that provides energy to a certain device. It can even out the output of the voltage regulator and reduce load requirements.

3. Go to the lotus root: Remove the lotus root, also known as the lotus root removal. If the load capacitance is relatively large, the driving circuit must charge and discharge the capacitor to complete the signal transition. When the rising edge is relatively steep, the current is relatively large, so the driving current will absorb a large power supply current. Since the circuit The inductance and resistance (especially the inductance on the chip pins will cause rebound), this current is actually a kind of noise compared to normal conditions, which will affect the normal operation of the front stage. The decoupling capacitor functions as a battery to meet the changes in the drive circuit current and avoid mutual coupling interference.

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