Hybrid Electric Vehicle Training Educator

Inverter with Converter


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  • technical details

The inverter consists of two major components – the inverter and converter in one single unit.

The inverter receives 201.6 volts direct current (DC) from the high-voltage battery via the orange, high-voltage cables. The DC is converted to alternating current (AC) and sent to motor/generator (MG) 1 and MG 2, both residing in the hybrid transaxle. Motor speed, horsepower (hp), and torque are controlled by the inverter. When braking, the hybrid transaxle generates electricity from MG 2, and the inverter reverses the sequence and converts AC to DC and sends it back to the high-voltage battery for charging.

DC-DC Converter
The DC-DC converter drops the high-voltage battery nominal voltage of 201.6 volts DC to approximately 12 volts DC, in order to supply electricity to the electrical components, as well as to recharge the auxiliary battery. This is what an alternator does on a non-hybrid vehicle.

Inverter Control
The inverter converts direct current from the high-voltage battery into alternating current for motor/generator (MG) 1 and MG2, or vice versa, in accordance with the signals provided by the hybrid vehicle electronic control unit (HV ECU). In addition, the inverter is used to transfer power from MG1 to MG2.

The HV ECU shuts down the inverter if it receives the overheating, over current, or fault voltage signal from the inverter.

Boost Converter Control
The boost converter boosts the high-voltage battery nominal voltage of 201.6 volts DC up to a maximum voltage of 650 volts DC (required input to the inverter), in accordance with the signals provided by the HV ECU.

The inverter converts alternating current generated by MG1 or MG2 into direct current. The boost converter drops the generated voltage of 650 volts DC (maximum voltage) to approximately 201.6 volts DC, (nominal voltage of the high-voltage battery for energy storage) in accordance with the signals provided by the HV ECU.

DC-DC Converter Control
The DC-DC converter drops the high-voltage battery nominal voltage of 201.6 volts DC to approximately 12 volts DC in order to supply electricity to the electrical components, as well as to recharge the auxiliary battery. This all happens electronically, with no moving parts. As long as the vehicle has power, the converter will charge the low-voltage, auxiliary battery and power auxiliary devices.

© 2012 National Alternative Fuels Training Consortium.

Inverter with Converter

Inverter with Converter