Vehicle propulsion system with multi-channel DC bus and method of manufacturing same
First Claim
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1. An apparatus comprising:
- a first energy storage system coupled to both a first channel and a second channel of a multi-channel DC bus assembly;
a first electric motor coupled to a positive DC link of the first channel;
a second electric motor coupled to a positive DC link of the second channel, wherein the second electric motor is configured to operate at a higher speed than the first electric motor;
a first inverter coupled to the positive DC link of the first channel;
a second inverter coupled to the positive DC link of the second channel;
a first bi-directional DC/DC converter coupled to the positive DC link of the second channel; and
a coupling device coupled to the positive DC link of the first channel, and coupled to the positive DC link of the second channel between the first DC/DC converter and the second inverter, the coupling device configured to selectively couple the positive DC link of the first channel to the positive DC link of the second channel.
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Abstract
An apparatus includes a multi-channel DC bus assembly comprising a first channel and a second channel, a first electromechanical device coupled to a positive DC link of the first channel, and a second electromechanical device coupled to a positive DC link of the second channel. A first DC-to-AC voltage inverter is coupled to the positive DC link of the first channel and a second DC-to-AC voltage inverter is coupled to the positive DC link of the second channel. The apparatus further includes a bi-directional voltage modification assembly coupled to the positive DC link of the second channel and a first energy storage system electrically coupled to the first electromechanical device.
15 Citations
18 Claims
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1. An apparatus comprising:
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a first energy storage system coupled to both a first channel and a second channel of a multi-channel DC bus assembly; a first electric motor coupled to a positive DC link of the first channel; a second electric motor coupled to a positive DC link of the second channel, wherein the second electric motor is configured to operate at a higher speed than the first electric motor; a first inverter coupled to the positive DC link of the first channel; a second inverter coupled to the positive DC link of the second channel; a first bi-directional DC/DC converter coupled to the positive DC link of the second channel; and a coupling device coupled to the positive DC link of the first channel, and coupled to the positive DC link of the second channel between the first DC/DC converter and the second inverter, the coupling device configured to selectively couple the positive DC link of the first channel to the positive DC link of the second channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle propulsion system comprising:
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a DC bus assembly comprising; a first DC bus; and a second DC bus; a first bi-directional DC/DC converter coupled to the second DC bus; a high specific-power energy storage device coupled to the first DC bus and coupled to a low voltage side of the first bi-directional DC/DC converter; a first electric motor coupled to the first DC bus through a first DC/AC converter; a second electric motor coupled to the second DC bus through a second DC/AC converter, wherein the second electric motor is configured to operate at a higher speed than the first electric motor; a coupling device coupled to the first DC bus, and coupled to the second DC bus between the first DC/DC converter and the second inverter, the coupling device configured to selectively couple the first DC bus to the second DC bus; and a controller programmed to control the first bi-directional DC/DC converter to buck a voltage of the second DC bus to a bucked voltage and supply the bucked voltage to the high specific-power energy storage device. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A vehicle propulsion system comprising:
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a first electric motor coupled to a positive DC link of a first DC bus; an auxiliary load coupled to an output of the first electric motor; a first inverter coupled to the positive DC link of the first DC bus; a second electric motor coupled to a positive DC link of a second DC bus, wherein the second electric motor operates at a higher speed than the first electric motor; a transmission coupled to and output of the first electric motor and an output of the second electric motor; a second inverter coupled to the positive DC link of the second DC bus; an energy storage system coupled to both the positive DC link of the first DC bus and the positive DC link of the second DC bus; a first bi-directional DC/DC converter coupled to the positive DC link of the second DC bus; and a coupling device coupled to the positive DC link of the first DC bus, and coupled to the positive DC link of the second DC bus between the first DC/DC converter and the second inverter, the coupling device configured to selectively couple the positive DC link of the first DC bus to the positive DC link of the second DC bus. - View Dependent Claims (18)
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Specification