Introduction to the working principle of power supply
The working process of switching power supply is quite easy to understand. In linear power supply, let the power transistor work in linear mode. Unlike linear power supply, PWM switching power supply is to let the power transistor work in the state of on and off. In these two states, the volts added to the power transistor-The product of an is very small (When on, the voltage is low and the current is large; When off, the voltage is high and the current is small)
/The volt-ampere product on the power device is the loss generated on the power semiconductor device.
Compared with the linear power supply, the more effective working process of PWM switching power supply is realized by 'chopping', that is, chopping the input DC voltage into a pulse voltage with an amplitude equal to the amplitude of the input voltage.
The duty cycle of the pulse is adjusted by the controller of the switching power supply.
Once the input voltage is cut into an AC square wave, its amplitude can be raised or lowered by the transformer.
The output voltage value can be increased by increasing the number of secondary windings of the transformer.
* After These AC waveforms are rectified and filtered, the DC output voltage is obtained.
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