First, the basic working principle of the switching regulator power supply Switching regulator power supply connection control mode is divided into two types: widening type and frequency modulation type. In practical applications, the widening type is used more, and is currently developed and used. Most of the switching power supply ICs are also pulse width modulated. Therefore, the following mainly introduces the widened switching power supply.
The basic principle of the widened switching regulator power supply can be seen in the figure below.
When the switch VT1 is turned on, the inductor L stores energy, the diode VD1 is turned off, and the load RL is powered by the last charge of the capacitor C. When the switching tube VT1 is turned off, the current in the inductor L continues to flow, and a positive negative voltage is induced, and the capacitor VD1 supplies power to the load while charging the capacitor C.
The basic working principle and various circuit types of the pulse width modulation switching power supply are introduced above. In practical applications, there are various practical control circuits, but in any case, they are developed on these foundations. of.
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