| 摘要 |
<p>A DC power supply circuit is provided, wherein a control circuit controls the ON/OFF time of a semiconductor switching unit through a SCR drive circuit and a MOS drive circuit and conducts the semiconductor switching unit when a start section and a end section of each positive half-wave are lower than a predetermined level, so that each cut-section obtained from each positive half-wave of the AC source is used as a charging power. The invention is used to charge a battery or to supply with a DC power.</p> |
