About Capacitors - Knowledge

The so-called capacitance is an electronic component that holds and releases an electric charge. The basic working principle of capacitors is charging and discharging, of course, there are rectification, oscillation and other roles. In addition, the structure of the capacitor is very simple, mainly by the two positive and negative electrodes and sandwiched in the middle of the insulating medium, so the type of capacitance is mainly by the electrodes and the insulating medium decision. So what is the use of capacitors in the circuit? Next let power adapter manufacturers to introduce it to you.

Filter capacitors: it is connected to the DC voltage between the positive and negative poles, to filter out the DC power supply in the unwanted AC components, so that the DC smooth, usually using large-capacity electrolytic capacitors, but also in the circuit at the same time and other types of small-capacity capacitors in order to filter out high-frequency alternating current.

Decoupling capacitors: parallel connection in the amplifier circuit between the positive and negative poles of the power supply, to prevent the formation of positive feedback caused by the power supply internal resistance of the parasitic vibration.

Bypass capacitors: in the AC and DC signal circuit, the capacitor is connected in parallel at both ends of the resistor or by a point in the circuit across to the common potential for AC signals or pulse signals to set up a path, to avoid the AC signal components through the resistor to produce a voltage drop attenuation.

Bypass capacitance: in the circuit of AC and DC signals, the capacitor is connected in parallel at both ends of the resistor or by a point in the circuit across to the common potential for AC signals or pulse signals to set up a path to avoid the AC signal components through the resistor to produce voltage drop attenuation.

Coupling capacitor: in the AC signal processing circuit, used to connect the signal source and signal processing circuit or as two amplifiers between the stages of the connection, used to isolate the DC, so that AC signals or pulse signals through the front and rear stages of the amplifier circuit of the DC operating point does not affect each other.

Tuning capacitor: connected to the resonant circuit of the oscillating coil at both ends, play the role of selecting the oscillation frequency.

Cushion capacitance: auxiliary capacitance connected in series with the main capacitance of the resonant circuit, adjusting it can make the oscillating signal frequency range smaller, and can significantly improve the oscillation frequency of the low-frequency end.

Compensation capacitance: auxiliary capacitance connected in parallel with the main capacitance of the resonant circuit, adjust the capacitance can make the oscillation signal frequency range.

Of course, today's power adapter manufacturers only introduced a part of it, in addition to capacitance there are many other uses, here will not be introduced one by one.

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