Onboard charging system and control method thereof

摘要

An onboard charging system in which a main battery (3) is charged with generated power by a solar cell (2) after the generated power is stepped up in a voltage by a step-up converter (9) includes a step-up ratio calculating portion (62) configured to calculate a step-up ratio when stepping up the voltage with the step-up converter (9). The auxiliary battery (4) is set as a charging target battery if it is determined that the calculated step-up ratio is equal to or greater than the determination threshold value, and the main battery (3) is set as the charging target battery if it is not determined that the calculated step-up ratio is equal to or greater than the determination threshold value.

主权项

1. An onboard charging system comprising:
a main battery that is charged with generated power that is power generated by a solar cell mounted in a vehicle, the solar cell generating power by being subjected to sunlight, and supplies the charged power to a running electric motor that is a drive source that drives the vehicle; an auxiliary battery that is charged with the generated power, and supplies the charged power to an auxiliary mounted in the vehicle; a step-up converter that steps up a voltage of the generated power to be charged to the main battery; a step-up ratio calculating portion configured to calculate a step-up ratio when stepping up the voltage with the step-up converter; a control switch that selects the main battery or the auxiliary battery as a charging target battery to be charged with the generated power; and a control portion configured to set the charging target battery based on the step-up ratio calculated by the step-up ratio calculating portion, and to control the control switch to select the set charging target battery, wherein the control portion is configured to determine whether the step-up ratio is equal to or greater than a determination threshold value, as a determination process for setting the charging target battery, the control portion is configured to set the auxiliary battery as the charging target battery when it is determined that the step-up ratio is equal to or greater than the determination threshold value, and the control portion is configured to set the main battery as the charging target battery when it is not determined that the step-up ratio is equal to or greater than the determination threshold value.