Redundant power structure for battery management unit

A method for reducing quiescent current from a high-voltage rechargeable energy

• storage system comprising:
• presenting a low-voltage electrical power from a low-voltage battery to a battery management unit;
• presenting a high-voltage electrical power from a rechargeable energy storage system to the battery management unit;
• consuming the low-voltage electrical power by a control circuit of the battery management unit;
• converting the high-voltage electrical power into the low-voltage electrical power with a flyback transformer;
• transferring the low-voltage electrical power from the low-voltage battery to the control circuit along a first path;
• and
• transferring the low-voltage electrical power from the flyback transformer to the control circuit along a second path coupled to the first path.

A vehicle comprising:

• a low-voltage battery operational to present a low-voltage electrical power;
• a rechargeable energy storage system operational to present a high-voltage electrical power;
• and
• a battery management unit electrically coupled to the low-voltage battery and the rechargeable energy storage system, wherein the battery management unit includes:
• a control circuit operational to consume the low-voltage electrical power;
• a flyback transformer operational to convert the high-voltage electrical power into the low-voltage electrical power;
• a reversed block operational to transfer the low-voltage electrical power unidirectionally along a first path from the low-voltage battery to the control circuit;
• and
• a transistor operational that transfer the low-voltage electrical power along a second path from the flyback transformer to the control circuit.