| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a reliable power unit for back up, where the forward voltage drop of a power source for backup (primary battery voltage) is small and the inflow current to the primary battery is small. <P>SOLUTION: This power unit is equipped with a reverse current preventive means 5, which suppresses the voltage drop(Ea-Eb) of voltage Eb for backup supplied from the primary battery 6(battery voltage Ea) and also limits the reverse current(inflow current IC), which flows into the primary battery 6, accompanying the application of the DC voltage Vc2 of a power circuit 2, to be within a specified value. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
