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Home » News » industry information » The eight basic functions of metallized film capacitors

The eight basic functions of metallized film capacitors

Views: 0     Author: Site Editor     Publish Time: 2020-02-20      Origin: Site

1. DC blocking. This is not only the role of metal film capacitors, but also the basic role of all capacitors, which is to prevent DC from passing and let AC pass.

 

2. Coupling. The coupling effect of the metal film capacitor is to act as a connection between two circuits, allowing AC signals to pass through and be transmitted to the lower circuit. Coupling is used as a component in the circuit to pass the front signal to the back and to isolate the influence of the front to the back stage, so that the debugging of the circuit is simpler and the performance is more stable.

 

3. Filtering. The filtering function of the capacitor is very important in the circuit. The capacitor behind the CPU basically has this function. When the capacitor uses the filtering function, the larger the frequency f, the smaller the impedance Z of the capacitor. At low frequencies, the capacitor C has a relatively large impedance Z, and the useful signal can pass smoothly. At high frequencies, the capacitor C is already very small due to the impedance Z, which is equivalent to short-circuiting high-frequency noise to GND.

 

4. Bypass: The capacitor used in the bypass circuit is called the bypass capacitor. If a certain frequency band signal needs to be removed from the signal in the circuit, a bypass capacitor circuit can be used. Depending on the frequency of the removed signal, there is a full frequency. Domain bypass capacitor circuit and high-frequency bypass capacitor circuit.

 

5. Temperature compensation. The temperature compensation function of the capacitor is mainly aimed at the influence caused by the insufficient adaptability of the temperature of other components, so as to compensate by the capacitor and improve the stability of the circuit.

 

6. High-frequency vibration damping: The capacitor used in high-frequency vibration damping circuits is called high-frequency vibration damping capacitors. In audio negative feedback amplifiers, in order to suppress high-frequency self-excitation that may occur, this capacitor circuit is used to Eliminate the high frequency howling that may occur with the amplifier.

 

7. Neutralize. Capacitors used in neutralization circuits are called neutralizing capacitors. In radio high-frequency and intermediate-frequency amplifiers and television high-frequency amplifiers, this type of neutralizing capacitor circuit is used to eliminate self-excitation.

 

8. Timing. Capacitors used in timing circuits are called timing capacitors. The timing capacitor circuit is used in the circuit that needs time control through capacitor charging and discharging. The capacitor plays a role in controlling the size of the time constant.


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