Introduction of Different Ceramic Capacitors

your location : Home > Weidy Express > Capacitor Technology Hall >

Introduction of Different Ceramic Capacitors

2021-09-03 16:03:27

When it comes to capacitors, various names will make people dizzy, film capacitors, safety Y capacitors, high-voltage capacitors, etc. In fact, high-voltage ceramic capacitors also have many names, such as bypass capacitors, decoupling capacitors, filter capacitors, energy storage capacitors, etc. Wait, in fact, no matter how it is called, its principle is the same, that is, to use the AC signal to present the characteristics of low impedance, which can be seen from the equivalent impedance formula of the capacitor: Xcap=1

The decoupling ceramic capacitor acts as a battery to meet the change of the drive circuit current and avoid mutual coupling interference. Decoupling and bypassing can be thought of as filtering. Decoupling ceramic capacitors are equivalent to batteries, to avoid voltage drop due to sudden changes in current, which is equivalent to filtering. The specific capacitance value can be calculated according to the current, expected ripple and action time. Decoupling ceramic capacitors are generally large and have little effect on higher frequency noise.

The bypass ceramic capacitor is for high frequency, that is, the frequency impedance characteristic of the capacitor is used. Capacitors can generally be viewed as an RLC series model. At a certain frequency, resonance occurs where the impedance of the capacitor is equal to the ESR. If you look at a frequency impedance graph for a capacitor, you'll see that it usually is. The specific curve is related to the capacitor medium, so the capacitor medium should also be considered when selecting the bypass ceramic capacitor. A safer approach is to add a few capacitors.

In electronic circuits, both decoupling capacitors and bypass capacitors play the role of anti-interference, and the positions of the capacitors are different, and the names are also different. For the same circuit, the bypass capacitor takes the high-frequency noise in the input signal as the filtering object, and filters out the high-frequency clutter carried by the previous stage, and the decoupling capacitor is also called the decoupling capacitor, and uses the high-frequency noise of the output signal Interference is filtered out. The capacitor that bypasses and filters out the high-frequency components in the AC signal mixed with high-frequency current and low-frequency current is called a bypass capacitor.

Previous : The capacity of the fan capacitor is not enough, can two capacitors be connected in parallel? Next : Power Electronic Capacitors