How are the chip capacitor named? What are its functions?

Multilayer (multilayer, laminated) chip ceramic capacitor are the full name of chip capacitor, which can also be called chip capacitors. The method of expression is: 1. inch unit; 2. millimeter unit.

effect:

1) Bypass

The bypass capacitor is an energy storage device, which provides energy for the local device, so that the output of the regulator is evened, and the load demand is reduced. The bypass capacitor should be close to the power supply pin and ground pin of the load device to reduce impedance. Prevent the input value from being too large and causing the ground potential to raise the noise.

2) Decoupling

Also known as decoupling. From the circuit, it can be divided into: drive power and driven load. If the load capacitance is large, the driving circuit must charge and discharge the capacitance to complete the signal jump. When the rising edge is steep, the current is large, and large power supply current will be absorbed. Due to the inductance, this resistance current is a kind of noise relative to the normal situation, which affects the normal operation of the previous stage, which is "coupling".

The decoupling capacitor is to meet the current change of the drive circuit and avoid coupling interference. Play the role of "battery"

3) Filtering

Filtering is the process of charging and discharging. Most of the capacitor over 1μF are electrolytic capacitor. This kind of electrolytic capacitor has a large inductance component, so the impedance increases when the frequency is high. Passing high frequency and blocking low frequency is the function of capacitor, which is specifically used in filtering. Large capacitor (1000μF) filter low frequencies, and small capacitor (20pF) filter high frequencies.

4) Energy storage

The charge is collected by the rectifier, and the stored energy is transferred to the output end of the power supply through the lead of the converter, which is an energy storage capacitor. The voltage value is 40～450VDC, and the capacitance value is between 220～150 000μF, which are the more commonly used aluminum electrolytic capacitor. The device sometimes adopts the form of series, parallel or combination according to different power requirements. In the case of power supplies with a power level of more than 10KW, larger tank-shaped screw terminal capacitor are usually used.