| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle-mounted power supply apparatus with built-in secondary battery capable of detecting output current while avoiding increasing of the apparatus in size. SOLUTION: In the apparatus, output current i from a voltage-dropped DC-DC converter 13 is calculated on the basis of an input voltage Vi of a charging device, a duty ratio DUTY of an inverter 4 of the converter 13 and an output voltage Vo from the device to allow an omission of a current sensor. |
