Vehicle-mounted charging system

A vehicle-mounted charging system to be mounted in a vehicle provided with a first connector, to which a charging cable of a first charging apparatus that performs charging in accordance with a first charging method is to be connected, and a second connector, to which a charging cable of a second charging apparatus that performs charging in accordance with a second charging method is to be connected, the vehicle-mounted charging system for charging a battery in the vehicle with power supplied from the first charging apparatus or the second charging apparatus, comprising:

• a first relay for switching between connection and disconnection of power supply paths from the first connector and the second connector to the battery, the first relay being provided on the power supply paths;
• a charging controller for communicating with the first charging apparatus via a charging cable connected to the first connector, and turning on the first relay in accordance with the first charging method to charge the battery;
• a charging method determiner for determining whether the battery is to be charged in accordance with the first charging method or the second charging method;
• a relayer for communicating with the second charging apparatus via a charging cable connected to the second connector and also communicating with the charging controller to relay communication between the second charging apparatus and the charging controller, if the charging method determiner determines that charging is to be performed in accordance with the second charging method;
• a delay controller for performing control to delay a timing at which the charging controller turns on the first relay, if the charging method determiner determines that charging is to be performed in accordance with the second charging method;
• and
• a second relay for switching between connection and disconnection of a control signal transmission path from the charging controller to the first relay, the second relay being provided on the control signal transmission path,
• wherein the delay controller
• keeps the second relay in an ON state if the charging method determiner determines that charging is to be performed in accordance with the first charging method, and
• sets the second relay to an OFF state and thereafter switches the second relay to an ON state at a timing later than a timing at which the charging controller outputs a signal to set the first relay to an ON state, if the charging method determiner determines that charging is to be performed in accordance with the second charging method.