Patent ID: 8026638
Filing Date: 2011-09-27
Classification: B60L,Y02T

Abstract:
1. A propulsion system comprising: an electric drive; a direct current (DC) link electrically coupled to the electric drive; a first energy storage system electrically coupled to the electric drive, the first energy storage system comprising at least a high specific-power energy storage device; a second energy storage system, wherein a first terminal of the second energy storage system is electrically coupled to the electric drive through the DC link and a second terminal of the second energy storage system is coupled in series with a terminal of the high specific-power energy storage device; and a multi-channel bi-directional boost converter coupled to the first energy storage system and to the second energy storage system, wherein the series connection between the terminal of the high specific-power energy storage device and the second terminal of the second energy storage system bypasses the multi-channel bi-directional boost converter.