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Yangzhou Kaihong Power Technology Co., Ltd. (Yangzhou Headquarters)
Sales phone: 0514-87979963
Sales Straight 1: 13773587351
Sales line 2: 18932373905
Sales line 3: 15190420406
Company Fax: 0514-87580922
Sales email: yzkaihong@163.com
Company address: Xi'an Jiaotong University Pioneer Park, East Wuzhou Road, Yangzhou

DC switching power supply
DC switching power supply

The DC switching power supply is used to switch on and off at high speed by controlling the switching tube through the circuit. The AC power is supplied to the transformer to transform it into high-frequency DC power, thereby generating the required one or more sets of voltage! The reason for the conversion to high-frequency AC is that the efficiency of high-frequency AC in the transformer transformer circuit is much higher than 50HZ. So the switching transformer can be made very small and not very hot when working! !! The cost is very low. If you do not change 50HZ to high frequency, the switching power supply is meaningless.

working principle

1.AC power input is rectified and filtered into DC;

2.Control the switching tube by high frequency PWM (pulse width modulation) signal, and add that DC to the switching transformer primary;

3.The switching transformer secondary induces high-frequency voltage and supplies it to the load through rectification and filtering;

4.The output part feeds back to the control circuit through a certain circuit to control the PWM duty cycle to achieve the purpose of stable output.

When AC power is input, it usually passes through something like a hell current loop to filter out the interference on the power grid, and also filter out the interference from the power supply to the power grid;

When the power is the same, the higher the switching frequency, the smaller the size of the switching transformer, but the higher the requirements for the switching tube;

The secondary of the switching transformer can have multiple windings or one winding with multiple taps to get the required output;

Generally, some protection circuits should also be added, such as no-load, short-circuit protection, otherwise the switching power supply may be burned.

DC switching power supply is mainly used in industry and some household appliances, such as televisions, computers and so on.

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