Basic composition of switching power supply

The Switching Power Supply is mainly composed of the main circuit, control circuit, detection circuit and auxiliary Power Supply.
1. Main circuit
Impingement current limiter: limits the impingement current at the input side of the power supply.
Input filter: its function is to filter the clutter existing in the power grid and prevent the clutter generated by the machine from feeding back to the power grid.
Rectification and filtering: the grid ac power supply is directly rectified to a relatively smooth dc.
Inverter: the rectified dc into high frequency alternating current, which is the core of high frequency switching power supply.
Output rectifier and filter: according to the load needs, to provide a stable and reliable dc power supply.
2. Control circuit
On the one hand, the sample is taken from the output end, compared with the set value, and then the inverter is controlled to change its pulse width or pulse frequency to make the output stable. On the other hand, according to the data provided by the test circuit, the protection circuit is identified, and the control circuit is provided to protect the power supply.
3. Detection circuit
Provide protection circuit in the operation of various parameters and various instrument data.
4. Auxiliary power supply
Realize the power of the software (remote) start, for the protection circuit and control circuit (PWM chip) work power.

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Shenzhen Waweis Technology Co., Ltd. is a high-tech enterprise engaged in r&d, production and sales of notebook adapters. The main products are switch power supply, power adapter, charger, LED power supply and other products professional production and processing.

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Una Yang