1. An effective noise attenuation method for high-voltage DC power supplies using a switching circuit with common-mode inductors is presented. The frequency range of common-mode noise is from 10kHz to 50MHz or higher. The high-voltage DC power supply requirements within this frequency range for common-mode inductors ensure sufficient inductance to produce the high voltage DC power supply as stated in point 1. Aircraft Power Supply
Normal communication current analysis through a common-mode inductor in a high-voltage DC power supply, 220V AC is the differential mode current of the high-voltage DC control system power supply, flowing through the high-voltage DC operating power supply common-mode coil L3 and L4. The currents in the two coils can generate magnetic fields in opposite directions, which can cancel each other out. At this point, the normal cell signals of the enterprise pass through the current, mainly affected by the internal resistance of the coil, as well as a small amount of damping (inductance) caused by leakage inductance. Considering the frequency of the 220V AC is only 50Hz, the inductance of the common-mode inductor in the high-voltage DC power supply is not large, so the common-mode inductor of the high-voltage DC voltage power supply has a very small inductive reactance for the normal 220V AC, which does not affect the power supply of the 220V AC to the entire machine. 400HZ Frequency Converter Power Supply
(2) Analysis of common-mode current in high-voltage DC power supplies. When the common-mode current of the high-voltage DC power supply flows through the common-mode inductor of the high-voltage DC power supply, due to the common-mode current of the high-voltage DC power supply generating a magnetic field of the same direction in the common-mode inductor, the magnetic field of the same direction in the inductors L3 and L4 is enhanced, increasing the inductance of the inductor L3, and the common-mode current of the DC power supply.
The addition of two Y capacitors, C2, and the common-mode noise filtering interference effect of the C3 in conjunction with the DC high-voltage power supply, significantly suppresses the common-mode interference of the high-voltage DC power supply.
2. The circuit design of the differential mode inductor for a high-voltage DC power supply system is a differential mode inductor circuit for high-voltage DC power supplies. The differential mode inductors L1 and L2 for high-voltage DC motor power supplies can be connected in series with the × capacitor to form a loop. This is because L1 and L2 have a high reactance to the differential high-frequency noise of the high-voltage DC power supply, while the X capacitor C1 has a low reactance to the high-frequency noise. This effectively filters out the differential high-frequency interference and environmental noise from the high-voltage DC power supply, preventing it from directly affecting the subsequent circuit, thereby achieving the goal of effectively suppressing the noise caused by this high-voltage DC power supply differential high-frequency electronic interference. 400HZ power supply
