Dual voltage electrical architecture for a vehicle, in which the only power source is a lithium-ion battery

A dual voltage electrical architecture for a vehicle, said architecture comprising a low-voltage network, a high-voltage network and a DC/DC converter for transferring power from the high-voltage network to the low-voltage network, the electrical architecture further comprising:

• a high-voltage lithium-ion battery,
• a first and second contactors connected respectively to a positive and a negative terminals of the lithium-ion battery,
• a pre-charge circuit consisting of a pre-charge contactor and a pre-charge resistor connected in series, wherein the pre-charge contactor and the pre-charge resistor are connected in parallel with the first contactor,
• a battery management unit (BMU) for controlling the opening and closing of the contactors,
• a vehicle start device,
• wherein the DC/DC converter comprises a first input terminal connected to the first contactor and to the pre-charge contactor and a second input terminal connected to the second contactor,
• wherein the only power source of the electrical architecture is the lithium-ion battery delivering power to the high-voltage network
• wherein the battery management unit comprises an input terminal connected to the vehicle start device so that when the vehicle start device is operated, the electrical architecture enters into a battery wake-up mode, in which:
• the first contactor is open;
• the second contactor and the pre-charge contactor are closed and
• the DC/DC converter generates power at low-voltage in order to wake up a main vehicle electronic board.