System for selectively coupling an energy source to a load and method of making same

摘要

A multi-energy storage device system includes an electric drive coupled to a load, a DC link coupled to the electric drive, and a bi-directional voltage converter having an output channel coupled to the DC link and an input channel. A first energy storage device (ESD) is coupled to the input channel, and a switch is coupled to the DC link and to a second ESD. A system controller causes the switch to couple the second ESD to the DC link for delivering energy stored in the second ESD to the electric drive. The system controller also causes the voltage converter to convert a voltage of the first ESD to a higher voltage and to deliver the higher voltage to the DC link, wherein the higher voltage is greater than the voltage of the second ESD and causes the switch to decouple the second ESD from the DC link.

主权项

1. A multi-energy storage device system comprising:
an electric drive coupled to a load; a direct current (DC) link coupled to the electric drive; a bi-directional voltage converter comprising an output channel coupled to the DC link and comprising an input channel; a first energy storage device coupled to the input channel of the bi-directional voltage converter; a switch coupled to the DC link; a second energy storage device coupled to the switch; and a system controller configured to:
send a signal to the switch to couple the second energy storage device to the DC link such that energy stored in the second energy storage device is delivered to the electric drive and such that a voltage of the second energy storage device is reduced as the energy stored therein is delivered to the electric drive; andcause the bi-directional voltage converter to convert a voltage of the first energy storage device to a higher voltage and to deliver the higher voltage to the DC link, wherein the higher voltage is greater than the voltage of the second energy storage device and causes the switch to decouple the second energy storage device from the DC link.