When the switch tube is saturated, the electric energy is stored in the inductor and flows to the load at the same time. When the switching element is controlled to cut off, because the current on the inductance can not be changed, the energy stored in the inductance continues to supply the load, at this time, the continuous current diode is positively conductive, forming a closed circuit. The capacitor plays the role of smoothing the output. In the circuit, the switch tube and load resistance are connected in series, so it is also called series switching power supply.<br>
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