As one of the passive components of Suda Electronics, electronic component capacitors are used in power circuits to realize the functions of capacitors in bypass, decoupling, filtering and energy storage.

1) Filtering

Filtering is a very important part of the role of capacitors. It is used in almost all power circuits. Theoretically (that is, assuming that the capacitor is a pure capacitor), the larger the capacitance, the smaller the impedance, and the higher the passing frequency. But in fact, most of the capacitors over 1uF are electrolytic capacitors, which have a large inductance component, so the impedance will increase after the frequency is high.

Sometimes we see that Suda Electronics has a large electrolytic capacitor connected in parallel with a small capacitor. At this time, the large capacitor passes low frequency and the small capacitor passes high frequency. The function of the capacitor is to pass high impedance and low impedance, and pass high frequency to block low frequency. The larger the capacitance, the easier it is to pass low frequencies, and the larger the capacitance, the easier it is to pass high frequencies. Specifically used in filtering, a large capacitor (1000uF) filters low frequencies, and a small capacitor (20pF) filters high frequencies.

Some netizens once compared the filter capacitor to a "pond." Since the voltage across the capacitor of Mianyang Suda Electronics Company does not change suddenly, it can be seen that the higher the signal frequency, the greater the attenuation. It can be vividly said that the capacitor is like a pond and will not cause water volume due to the addition or evaporation of a few drops of water. The change. It converts voltage changes into current changes. The higher the frequency, the greater the peak current, thus buffering the voltage. Filtering is the process of charging and discharging.

2) Bypass

The bypass capacitor of Suda Electronics is an energy storage Mianyang electronic component that provides energy for local devices. It can uniformize the output of the regulator and reduce the load demand. Just like a small rechargeable battery, the bypass capacitor can be charged and discharged to the device.

In order to minimize the impedance, the bypass capacitor of Suda Electronics should be as close as possible to the power supply pin and ground pin of the load device. This can well prevent the ground potential rise and noise caused by the excessive input value. The ground bounce is the voltage drop when the ground connection passes through the large current burr.