Switching Power Adapter works

 1. AC power input into DC by the rectifier filter;
 2. high frequency PWM (pulse width modulation) signal control switch, the switch that DC is applied to the transformer primary;
 3. The switching transformer secondary inductive high-frequency voltage, the rectifier filter supplied to the load;
 4. The output section of the circuit by a certain feedback to the control circuit, control PWM duty cycle to achieve the purpose of stable output.

  Generally after Eritrean asthenosphere AC power input or something, down-line interference filter also filters out power disturbances on the grid;
 In the same power, the higher the switching frequency, the smaller the volume switch of the transformer, but the switch to the higher requirements;
 Secondary switching transformer can have multiple windings or one winding has a plurality of taps to get the desired output;
 General should also increase the number of protection circuits, such as no-load, short circuit protection, otherwise you may burn Switching Power Adapter