The role of capacitance there are many, and they can be placed in a coupling circuit to allow AC signals to be transmitted to the next circuit. The capacitor also has a filtering function, which can remove a certain frequency band signal from the total signal. Capacitors can also improve the stability of the circuit after compensating for temperature and provide a low-impedance path for the effects of other components that are not adapted to temperature.
♦ coupling
The role of capacitance one is mainly coupling. At the same time, the use of capacitors in coupling circuits is called coupling capacitors, which mainly allow AC signals to be transmitted to the next circuit.
♦ Filter
The function of the capacitor in filtering is to remove a certain frequency band signal from the total signal, and generally the larger the capacitor, the smaller the impedance, the higher the frequency passed.
♦ make up
Capacitors can also compensate for the effects of temperature by analyzing the effects of other components that are not adapted to temperature, which can improve the stability of the circuit.
♦ bypass
Capacitors can be used in bypass circuits to remove signals in a certain frequency band, and they can also provide some low impedance paths for some parallel components in the AC circuit.
♦ Decoupling
The decoupling capacitor actually takes the output signal as the filtering object and acts as a “battery”, which can meet the change of the drive circuit current and avoid coupling interference between circuits.
♦ Rectify
The capacitor also has the function of rectification, which can turn on or off the semiconductor switching element at a predetermined time, so that the circuit can pass more stably.
