| 摘要 |
<p>Disclosed is a vehicular power unit having an idling stop function. The vehicular power unit comprises a booster converter circuit of little loss, which compensates the voltage drop of a battery at an engine starting time and which has a protecting function at the time when the battery is erroneously connected in reversed polarities. The vehicular power unit is constituted such that a series circuit including two series-connected MOSFETs (32 and 33) and an inductor (31) is connected with the two terminals of a DC power source, such that a diode (34) is connected with the node between the two series-connected MOSFETs (32 and 33) and the inductor (31), and such that a condenser (35) is connected in parallel with the two series-connected MOSFETs (32 and 33). These two MOSFETs (32 and 33) are connected in series so that the mutual body diodes thereof may have the opposite polarities.</p> |
