Charging system of mobile vehicle and operating method thereof

The invention provides a charging system of a mobile vehicle and an operating method thereof, which are used for receiving and converting an external ac (alternating current) power supply into a dc (direct current) power output for charging the mobile vehicle. The operating method comprises the following steps of: firstly, providing a high voltage dc voltage by a charging device; then, receiving and converting the high voltage dc voltage of the charging device by a dc power supply conversion device into a voltage level required by a rechargeable battery; and finally, controlling the dc power supply conversion device by a traveling computer controller to provide the rechargeable battery with the required charging current. Therefore, through power supply conversion provided by the dc power supply conversion device of the mobile vehicle, protection of the dc power supply conversion device on the rechargeable battery is improved, and adaptive charging is provided according to the state of the rechargeable battery