| 摘要 |
The synchronous switching power supply can be employed in multiple output power supply systems requiring extremely high efficiency and low number of components. The input signal may be AC or pulsating DC. A single switch is switched at zero voltage and current. The short circuit protection is inherent. A switching power supply with boost or flyback converter includes an inductor coupled to a node for attaining a current, a switch coupled to the node for selectively applying the input signal of one polarity across the inductor, wherein the inductor and switch are separately coupled to the input and ground in either order, a capacitor providing the output signal, rectifier coupled between the node and capacitor for conducting the current, a pair of comparators for comparing the input and output signals against respective reference signals, a circuit for determining an optimum value of the current as to minimize an overshoot of the output signal, and a circuit controlling the switch.
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