Switched-mode power supplies mainly include input grid filters, input rectifier filters, inverters, output rectifier filters, control circuits, and protection circuits. Their functions are:
Input Grid Filter: Eliminates interference from the power grid, such as motor startups, electrical switching, lightning strikes, etc., while also preventing the spread of high-frequency noise generated by switch-mode power supplies into the grid.
2. Input Rectifier Filter: Converts grid input voltage to rectified and filtered output, providing direct current voltage for the converter.
3. Inverters: A crucial component of switch-mode power supplies, inverters convert direct current voltage into high-frequency alternating current voltage, while also isolating the output section from the input power grid.
4. Output Rectifier Filters: Converts the high-frequency AC voltage from the converter to the required DC voltage through rectification and filtering, while also preventing high-frequency noise interference with the load.
5. Control Circuit: Detects the output DC voltage, compares it with a reference voltage, and amplifies it. Modulates the pulse width of the modulating oscillator to control the converter and maintain the stability of the output voltage.
6. Circuit Protection: In the event of overvoltage or overcurrent short circuits in the switching power supply, the protection circuit stops the operation of the switching power supply to safeguard both the load and the power supply itself. Avionic Power 16, 36V; Avionic Power 2, 400Hz Frequency Converter; 2, 115/200V Power; 4, 400Hz Power; 8, Avionic Ground Power
Switched-mode power supplies first convert alternating current (AC) to direct current (DC), then invert the DC back to AC, and finally rectify it to the required DC voltage. This eliminates the transformer and voltage feedback circuit from the linear power supply. The inverter circuit in switched-mode power supplies is entirely digitally adjusted, achieving very high adjustment accuracy.
