220V AC power enters the EMI (transient filter circuit), first passing through the primary EMI stage (comprised of capacitors and ferrite inductors), followed by the secondary EMI stage (consisting of MOV surge suppressor resistors, ferrite coils, and fuses). It is filtered through an "X" capacitor (metalized polyester capacitor) to remove high-frequency and pulse disturbances from the current, resulting in an AC output with no sharp peaks and low voltage; Aviation Power Supply
Low-voltage AC current enters the rectifying circuit, flows through a rectifier bridge (comprised of four diodes or a single component), and is corrected and rectified, resulting in a unidirectional pulsating DC voltage, also known as pulsating voltage.
The primary capacitive part of the pulsating voltage flows through polyester capacitors and ceramic capacitors to filter out high-frequency and pulse interference. It passes through the main capacitor filter to prevent interference, and the output is a DC voltage with fluctuations, known as ripple DC; 400Hz power supply.
The fluctuating DC current first enters the transformer and then the secondary side, where it undergoes voltage stabilization in the transformer. Next, it moves to the secondary side, where voltage regulation and rectification are achieved by the voltage regulator IC chip, voltage stabilizing diodes, and high-power Schottky rectifier bridge. The polyester capacitors filter the output, ultimately providing a pure low-voltage DC power supply of 27V.
