Patent ID: 8049372

Claim:
A precharge system for use in a vehicle, the precharge system comprising: a first energy source having a first terminal and a second terminal, wherein the first energy source has a first voltage equal to a potential difference between the first terminal and the second terminal; a bus having a first rail and a second rail, wherein the bus has a second voltage equal to a potential difference between the first rail and the second rail; a first contactor coupled between the first terminal and the first rail; a second contactor coupled between the second terminal and the second rail; and a controller coupled to the first energy source, the bus, the first contactor, and the second contactor, the controller being configured to: provide a voltage command to regulate the second voltage to the first voltage; activate the second contactor; and thereafter activate the first contactor if the magnitude of a difference between the first voltage and the second voltage is less than a threshold tolerance.