Power supply system and method for controlling power supply system

A power source system mounted in a vehicle, the power source system comprising:

• a first power source;
• a plurality of first loads configured to be operated by electric power supplied from the first power source;
• a first controller comprising a plurality of first controllers configured to control respective operations of the plurality of first loads by a respective plurality of first programs;
• a second power source connected to the first power source via a converter;
• a second load configured to be operated by electric power supplied from the second power source;
• a second controller configured to control an operation of the second load using a second program;
• an electric power disconnecting device configured to connect and disconnect the first power source and the plurality of first loads;
• and
• a third controller configured to control the electric power disconnecting device;
• wherein:
• the electric power disconnecting device is configured to connect and disconnect the first power source and the converter,
• the plurality of first loads and the converter are connected to the first power source in parallel via the electric power disconnecting device, and
• the third controller is configured to, upon receiving a request to sequentially change the plurality of first programs:
• before a first of the plurality of first programs is changed, disconnect the first power source from the plurality of first loads using the electric power disconnecting device;
• after the first of the plurality of first programs is changed, connect the first power source and the converter using the electric power disconnecting device, and
• before a second of the plurality of first programs is changed, disconnect the first power source from the converter using the electric power disconnecting device.

A power source system control method for controlling a power source system mounted in a vehicle, wherein:

• the power source system includes:
• a first power source;
• a first load configured to be operated by electric power supplied from the first power source;
• a first controller configured to control an operation of the first load using a first program;
• a second power source connected to the first power source via a converter;
• a second load configured to be operated by electric power supplied from the second power source;
• a second controller configured to control an operation of the second load using a second program;
• an electric power disconnecting device configured to connect and disconnect the first power source and the first load;
• a third controller that controls configured to control the electric power disconnecting device;
• a capacitor configured to smooth an output voltage of the first power source;
• and
• a discharge circuit configured to discharge an electric charge accumulated in the capacitor;
• and
• upon receiving a request to change the first program, before the first program is changed, the method comprises;
• disconnecting the first power source from the first load using the electric power disconnecting device;
• and
• after the first power source is disconnected from the first load, discharging the electric charge accumulated in the capacitor using the discharge circuit.