SYSTEM FOR SELECTIVELY COUPLING AN ENERGY SOURCE TO A LOAD AND METHOD OF MAKING SAME
First Claim
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;
cause 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; and
cause 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.
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Abstract
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.
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Citations
21 Claims
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1. A multi-energy storage device system comprising:
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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; cause 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; and cause 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of assembling a propulsion energy system, the method comprising:
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coupling an output channel of a bi-directional voltage converter assembly to a direct current (DC) link, the bi-directional voltage converter assembly comprising a first bi-directional voltage converter; coupling a first energy storage device to a first input channel of the bi-directional voltage converter assembly; coupling a switch to the DC link; coupling second energy storage device to the switch; coupling a load to the DC link, the load configured to receive energy from one of the first energy storage device and the second energy storage device via the DC link; coupling a controller to the bi-directional voltage converter assembly and to the switch; and configuring the controller to; cause 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 load and such that a voltage of the second energy storage device is reduced as the energy stored therein is delivered to the load; and cause 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. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable storage medium having a computer program stored thereon and representing a set of instructions that when executed by a computer causes the computer to:
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activate a first switch to transfer a voltage stored in a second energy storage device to a direct current (DC) link coupled to a load such that the voltage stored in the second energy storage device is delivered to the load as a voltage of the second energy storage device is reduced; and control a bi-directional voltage converter to convert a first voltage of a first energy storage device to a second voltage and to deliver the second voltage to the DC link, wherein the second voltage is greater than the voltage of the second energy storage device and causes the first switch to deactivate. - View Dependent Claims (20, 21)
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Specification