Circuit/System Description

The 14 V power module, often referred to as the accessory DC power control module, converts high voltage (300 V) direct current (DC) to low voltage (14 V) DC to charge the 12 V battery and power accessories. The 14 V power module receives a wake-up signal on a discrete line from the hybrid/EV powertrain control module 2 when the vehicle is ON. After a successful initialization, the 14 V power module receives an enable command from the hybrid/EV powertrain control module 1 over the serial data circuits to begin power conversion.