A switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switching transistors on and off to maintain a stable output voltage. The switching power supply is generally composed of a pulse width modulation (PWM) control IC and a MOSFET. In the switching regulator circuit, when the switch is in the on-off state, the tube works alternately in two states of cut-off and saturation. From the knowledge of the triode, when the triode works in the cut-off state, although the voltage drop of the tube is large, but The current flowing through the tube is almost zero; when the tube works in a saturated state, the current flowing through the tube is large, but the voltage drop across the tube is approximately zero. Therefore, when the regulating tube works in the switching state, its own power is extremely low. Under the same output power, the efficiency of the switching regulated power supply is higher than that of the series regulated power supply, generally reaching about 85%. Due to its low consumption, sometimes even the heat sink is not used, and the switching power supply generally does not have a bulky power frequency transformer, which greatly reduces its weight and volume [2].
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