In fact, the working process of the switching power supply is very simple and relatively easy to understand. In a linear power supply, we can let the power transistor operate in a linear mode, but the PWM switching power supply is different. PWM is our power transistor. The working state is in the state of diversion and shutdown. The voltage is low at the time of diversion, but the current is large at the same time. However, when the voltage is high, but the current is small at the time of shutdown, how is the loss calculated? The result of a voltammetric ride on a power device is the resulting loss on our power semiconductor devices.
PWM switching power supply is for a more efficient working process. This process is for the blocking band. This is different from the linear power supply. How to achieve this is to divide the input DC voltage into amplitude equal to this input. The pulse voltage of the voltage amplitude is realized, but the duty cycle of the pulse needs to be adjusted by the controller of the switching power supply. The amplitude of the switching power supply needs to be raised or lowered by the transformer. This is the input voltage needs to be cut off. In the AC square wave, we can increase the number of voltage groups we want to output by increasing the number of secondary windings of the transformer.
In order to keep the output voltage relatively stable, we need to use the controller to control. In fact, this working process is very similar to our linear form controller. In this case, the switching power supply controller has fast function, voltage reference, error amplifier. It can be the same as our linear adjustment, but there is a difference between them. The output of the error amplifier needs to be converted into a unit by a voltage or a pulse width, which needs to be before the power tube of the drive.
Forward conversion and boost conversion are the two main working methods of switching power supply. Although the arrangement of each part is very small, the working process is very different, and they have their own advantages and disadvantages. There are many benefits to using the occasion. Http://