Circuit/System Description

The 14 V power module, contained within the T18 Battery Charger assembly, converts the high voltage (400 V) direct current (DC) to low voltage (14 V) DC to charge the 12V battery and to operate the power accessories.

The 14 V power module is integrated within the T18 Battery Charger and is service only as a complete T18 Battery Charger assembly.

Two circuits are utilized to control and monitor the state of the 14 V power module.

The status circuit functions much like the F Terminal circuit on a generator equipped vehicle. A high side driver in the 14V power module applies a duty cycled voltage to the K16 Battery Energy Control Module. The duty cycle indicates the 14V power module internal temperature and operational condition.

The control circuit functions much like the L Terminal circuit on a generator equipped vehicle. A high side driver in the K16 Battery Energy Control Module applies a duty cycled voltage to the 14V power module. The duty cycle controls the 14V power module output.

The 14V power module generates more power as the commanded duty cycle increases.