Voltage Converter Module: Description and Operation

DC/DC Enable (DCE)

The DCE is an output from the PCM to the DC/DC converter. The PCM enables the DC/DC converter after the PCM receives a contactors closed message and no error messages. The DCE circuit is high (the low side driver is off) when the DC/DC is commanded on. When the DCE low side driver is activated, the DC/DC converter is commanded off. For additional information on DCE, refer to the DC/DC converter description in Hybrid Electric Control Hardware Hybrid Electric Control Hardware.

DC/DC Fault

The DC/DC fault (DCF) signal is an input to the PCM from the DC/DC converter. This signal is low under normal conditions and switches high when a concern exists within the DC/DC converter cooling system, the high voltage power supply to the DC/DC converter, or the low voltage output system. The PCM disables or limits the operation of the DC/DC converter by the DC/DC enable circuit (DCE), when a DCF concern is indicated. For additional information on DCF, refer to the DC/DC converter description in Hybrid Electric Control Hardware Hybrid Electric Control Hardware.