Circuit/System Description

The hybrid/EV battery pack contains 4 high voltage contactors and 1 solid state relay (transistor). The high voltage contactors allow the high voltage DC to be connected to the vehicle or safely contained within the hybrid/EV battery pack. The 4 high voltage contactors are a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, and a precharge negative high voltage contactor. The transistor controls the battery heater high voltage positive circuit.