Vehicle-mounted charging device and vehicle charging system

A vehicle-mounted charging device, comprising:

• a vehicle-mounted battery that is charged with power supplied from external charging equipment via a charging cable;
• a vehicle-mounted electronic control unit that includes an in-band modem, a microcomputer, and a startup selector switch, and that is configured to perform charging communication, relating to charging of the vehicle-mounted battery, with the external charging equipment using the in-band modem;
• a modem startup control unit that starts up the in-band modem when the vehicle-mounted electronic control unit performs the charging communication, and that stops a startup of the in-band modem when the vehicle-mounted electronic control unit does not perform the charging communication;
• and
• an auxiliary battery configured to supply power to the vehicle-mounted electronic control unit, wherein
• the microcomputer is configured to determine whether the charging communication that utilizes the in-band modem, between the vehicle-mounted electronic control unit and the external charging equipment, is permitted or prohibited based on a determination of whether or not the external charging equipment is connected via the charging cable and a determination of whether or not a control pilot signal that is supplied from the external charging equipment via the charging cable is received,
• the microcomputer is configured to determine that the charging communication is permitted, and adjust a state of the startup selector switch based on determining that the charging communication is permitted,
• the microcomputer is configured to determine that the charging communication is prohibited, and adjust the state of the startup selector switch based on determining that the charging communication is prohibited,
• the startup selector switch is configured to switch a state of supply of power from the auxiliary battery to the in-band modem between a permitted state and a prohibited state based on the state of the startup selector switch being adjusted by the microcomputer while keeping a state of supply of power from the auxiliary battery to the microcomputer, and
• the modem startup control unit starts up the in-band modem based on the microcomputer determining that the charging communication is permitted, and stops a startup of the in-band modem based on the microcomputer determining that the charging communication is prohibited.