A high-voltage energy regulated conversion circuit (HVERCC) (12) for electrically coupling to a vehicle bus (24) is provided. The HVERCC (12) includes a high-voltage energy converter (HVEC) module (22) coupled to the vehicle bus (24), a battery-pack high-voltage bus battery bus (28), and a WEG heater bus (29). The battery bus (28) is coupled to a high-voltage battery pack (30) and a WEG heater circuit (32). The HVEC module (22), the high-voltage battery pack (30), and the WEG heater circuit (32) are coupled to a logic controller (14) via a network (36). The logic controller (14) regulates the power on the vehicle bus (24), the battery bus (28), and the WEG heater bus (29). An operational method for the HVEC module (22) is also provided.