Resistance reduction principle of capacitance(II)

But because of the buoyancy, stability and safety are worse than half wave rectifier, so it uses less.When using this circuit, we need to pay attention to the following:

1), do not communicate with 220V high voltage isolation, please pay attention to safety, to prevent electric shock!

2), the current limiting capacitor must be connected to the fire line. The withstand voltage must be large enough (greater than 400V), plus surge protection and discharge resistance.

3), pay attention to the power consumption of Zener tube and strictly prohibit the operation of Zener tube.

2. The capacitor step-down power will convert AC power to low voltage DC.

The working principle of the capacitor depressurization is not complicated. The principle of his work is to limit the maximum working current by using capacitance reactance generated at a certain frequency of AC signal.

For example, under the power frequency condition of 50Hz, the capacitance of a 1uF capacitance is about 3180 ohms. When the AC voltage of 220V is added to the two ends of the capacitor, the maximum current flowing through the capacitor is about 70mA. Although the current flowing through the capacitor has 70mA, it does not produce power on the capacitor. If the capacitor is an ideal capacitor, the current flowing through the capacitor is a virtual current, and the work it makes is reactive power. According to this, if we connect a resistive element on a 1uF capacitor, the voltage and the power generated at both ends of the resistive element depend entirely on the characteristic of the resistive element.