Electrical power supply device and method of operating same

A method of operating an electrical power supply device having a device controller and a DC-DC power convertor, said electrical power supply device disposed within a universal serial bus (USB) port in communication with a USB hub which is in communication with a start-stop controller within a vehicle, said method comprising the steps of:

• receiving a signal from the USB hub;
• determining, via the device controller, whether said signal is a first USB signal from the USB hub indicating that the start-stop controller has transmitted the run signal or a second signal from the USB hub indicating that the start-stop controller has transmitted the stop signal;
• producing a first output voltage via the DC-DC power convertor in accordance with the device controller receiving the first USB signal from the USB hub;
• and
• producing a second output voltage via the DC-DC power convertor which is less than the first output voltage in accordance with the device controller receiving the second signal from the USB hub.

A Universal Serial Bus power delivery device, comprising:

• a DC-DC power convertor receiving an input voltage and producing a first output voltage or a second output voltage that is less than the first output voltage;
• a device controller in communication with the DC-DC power convertor, said device controller having one or more processors and memory;
• and
• an input voltage detection circuit in communication with the device controller and wherein the memory includes instructions which causes the device controller to command the DC-DC power convertor to output the first output voltage when the input voltage detection circuit determines that the input voltage is equal to or greater than a range of 9.5 to 10 volts and which causes the device controller to command the DC-DC power convertor to output the second output voltage when the input voltage detection circuit determines that the input voltage is less than the range of 9.5 to 10 volts.