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The basic components of a switch power supply
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The switch power supply is mainly composed of four parts: the main circuit, control circuit, detection circuit, and auxiliary power supply.
The switch power supply is mainly composed of four parts: main circuit, control circuit, detection circuit, and auxiliary power supply.
1. Main Circuit
Inrush current limiting: limits the inrush current at the moment of connecting the power supply.
Input filter: its function is to filter out noise present in the power grid and prevent noise generated by the device from feeding back into the grid.
Rectification and filtering: directly rectifies the AC power from the grid into a smoother DC power.
Inversion: converts the rectified DC power into high-frequency AC power, which is the core part of the high-frequency switch power supply.
Output rectification and filtering: provides a stable and reliable DC power supply according to the load requirements.
2. Control Circuit
On one hand, it samples from the output end, compares it with the set value, and then controls the inverter to change its pulse width or frequency to stabilize the output. On the other hand, it provides various protection measures for the power supply based on the data from the testing circuit, identified by the protection circuit.
3. Detection Circuit
Provides various parameters and instrument data that are currently running in the protection circuit.
4. Auxiliary Power Supply
Realizes the software (remote) startup of the power supply, providing power for the protection circuit and control circuit (such as PWM chips).
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Main types of switch power supplies
2024-11-29
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