| 摘要 |
PURPOSE: A power source circuit is provided to supply a dark current when a load does not operate, in the circuit which supplies power to the load by using a high voltage battery. CONSTITUTION: A high voltage load(20) and a low voltage load(22) are installed for a battery(10). Power is supplied to the low voltage load(22) via a main DC-DC converter(14) and a DC-DC sub-converter(16). When an ignition switch(18) is turned off, a dark current is supplied to the low voltage load(22) by only the DC-DC sub-converter(16), and the main DC-DC converter(14) is turned off. When the ignition switch(18) is turned on, necessary power is supplied by the main DC-DC converter(14). The dark current is supplied by the DC-DC sub-converter(16) of low capacity, so that the battery(10) can be prevented from being discharged. |
