The component parameters used in the peripheral of the switching power supply using different chips and schemes will be slightly different, but the basic working principle is the same, taking VIPer12A as an example, which is a very commonly used model in the induction cooker. VIPer12A is a power driver chip launched by ST, which integrates a high-voltage power tube inside the chip, and integrates a voltage source in the drain of the chip switch tube, so the power supply does not need to start resistance to work.
The chip is also integrated with overtemperature, overcurrent, overvoltage and other protection circuits, depending on the package, its maximum output power can be 13W.
According to the difference between the reference voltage and the measured voltage, the pulse width modulation rate is changed to stabilize the output voltage.