Electric vehicle power system with shared converter

A power system for an electric vehicle, the power system comprising:

• a battery control unit configured to be in a grid-connected mode or a stand-alone mode based on operation of the electric vehicle;
• and
• a shared boost converter connected to a battery, the shared boost converter configured to:
• facilitate charging of the battery when the battery control unit is in the grid-connected mode by receiving power from an alternating current (AC) power source, stepping up voltage and converting the received AC power to direct current (DC) power, and outputting converted and stepped up DC power for storage in the battery,
• facilitate charging of the battery when the battery control unit is in the stand-alone mode by receiving generated DC power, stepping down voltage of the generated DC power, and outputting the stepped down DC power for storage in the battery,
• facilitate discharging of the battery when the battery control unit is in the grid-connected mode by receiving stored DC power from the battery, stepping down voltage and converting the received stored DC power into AC power, and outputting the stepped down and converted AC power for providing to the AC power source, and
• facilitate discharging of the battery when the battery control unit is in the stand-alone mode by receiving DC power from the battery, stepping up voltage of the received DC power, and outputting stepped up DC power for powering a motor/generator of the electric vehicle.

An electric vehicle connected to an AC power source in a grid-connected mode and disconnected from the AC power source in a stand-alone mode, the electric vehicle comprising:

• a battery control unit configured to be in the grid-connected mode or the stand-alone mode;
• a shared boost converter configured to:
• step up voltage or step down voltage, and convert AC power to DC power or convert DC power to AC power when the battery control unit is in the grid-connected mode, and
• step up voltage or step down voltage when the battery control unit is in the stand-alone mode;
• an inverter coupled to the shared boost converter and configured to convert AC power to DC power or convert DC power to AC power when the battery control unit is in the stand-alone mode;
• a first switch and a second switch each having a first state and a second state, and each being connected to the battery control unit, the first switch located between the AC power source and the shared boost converter, and the second switch located between the shared boost converter and the battery, the first switch and the second switch each being set to the first state when the battery control unit is in the grid-connected mode such that the shared boost converter connects the AC power source and the battery, and the first switch and the second switch each being set to the second state when the battery control unit is in the stand-alone mode such that the shared boost converter connects the battery and the inverter;
• and
• a motor/generator connected to the inverter and configured to receive AC power from the battery via the inverter for powering a drivetrain of the electric vehicle or generate AC power for charging the battery.