Power systems for hybrid electric vehicle (HEV)

Details Power systems for hybrid electric vehicle (HEV) Power systems for hybrid electric vehicle (HEV)

2011-03-22

2011-03-22

Shriver, II, J. Allen (Department: 3618)

Motor vehicles

Power

Electric

C318S139000

Reexamination Certificate

active

07909124

ABSTRACT:
A hybrid electric vehicle (HEV) power system is provided that includes a vehicle electrical system (VES), an inverter-controller unit (ICU) and an AC electric motor/generator unit (MGU). The VES includes a first DC voltage source and a second DC voltage source coupled in series with the first DC voltage source. The VES also includes a first electrical load coupled across the first DC voltage source, and a second electrical load coupled across the second DC voltage source. The ICU is coupled across the first DC voltage source and the second DC voltage source and is designed to convert DC power from the first DC voltage source and the second DC voltage source to generate AC power for the AC electric MGU. Together the DC voltage sources can replace a conventional high-voltage DC voltage source. In some implementations, techniques are provided for “charge balancing” the first DC voltage source and the second DC voltage source without expensive devices.

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El-Antably, Ahmed, “Control Device For Driving A Brushless DC Motor,” U.S. Appl. No. 11/829,216, filed Jul. 27, 2007, unpublished.

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