Battery charger for vehicle-mounted equipment using engine operation as start timing determination.

摘要

A battery charger for a vehicle-mounted equipment comprises a first sensor for detecting when the voltage of the vehicle battery is higher than a specified level. A second sensor is provided for detecting when the engine of the vehicle is running. The outputs of the sensors determine the start timing of a charging operation. A switch is connected between the vehicle battery and the equipment's rechargeable battery. A timing circuit is responsive to the output signals of the first and second sensors for causing the switch to establish a path between the batteries for an interval sufficient to charge the rechargeable battery with a current supplied from the vehicle battery.