What is the basic composition of a switching power supply?

07 02, 2020

1. Main circuit

Inrush current limit: limit the inrush current on the input side when the power is turned on.

Input filter: its function is to filter the clutter that exists in the power grid and prevent the clutter generated by the machine from being fed back to the power grid.

Rectification and filtering: Directly rectify the AC power of the grid into a smoother DC.

Inverter: Convert the rectified DC power into high-frequency AC power, which is the core part of the high-frequency switching power supply.

Output rectification and filtering: Provide stable and reliable DC power supply according to load needs.

2. Control circuit

On the one hand, samples are taken from the output terminal and compared with the set value, and then the inverter is controlled to change its pulse width or pulse frequency to stabilize the output. On the other hand, according to the data provided by the test circuit, it is identified by the protection circuit to provide The control circuit carries out various protection measures for the power supply.

3. Detection circuit

Provide various operating parameters and various instrument data in the protection circuit.

4. Auxiliary power supply

Realize the software (remote) start of the power supply, and supply power for the protection circuit and control circuit (chips such as PWM).

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