System for charging electrical storage device and method of making same
First Claim
1. A propulsion system comprising:
- a motor drive;
a direct current (DC) link electrically coupled to the motor drive;
a first leg coupled to the DC link and comprising a first power switch coupled in series with a second power switch via a first node;
a first inductor coupled to the first node, wherein the first leg and inductor form a first bi-directional DC-DC voltage converter;
a first energy storage device (ESD) electrically coupled to the first inductor;
a second leg coupled to the DC link and comprising a third power switch coupled in series with a fourth power switch via a second node;
a second inductor coupled to the second node, wherein the second leg and second inductor form a second bi-directional DC-DC voltage converter;
a charging circuit comprising a transformer having a first terminal coupled to the first node and having a second terminal coupled to the second node;
a second ESD coupled to receive charging energy from the transformer; and
a controller coupled to the first and second legs and configured to cause a first variable voltage difference between the first and second nodes during an interleave duration of a frequency period to generate the charging energy, wherein the second ESD can be charged during operation of the motor drive.
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Accused Products
Abstract
A system for charging an electrical storage device includes a motor drive, a DC link electrically coupled to the motor drive, and a first leg coupled to the DC link that includes a first power switch coupled in series with a second power switch via a first node. A first inductor is coupled to the first node, and a first energy storage device (ESD) is electrically coupled to the first inductor. A second leg is coupled to the DC link that includes a third power switch coupled in series with a fourth power switch via a second node. A charging circuit includes a transformer coupled to the first and second nodes. A second ESD is coupled to receive charging energy from the transformer, and a controller is configured to cause a first voltage mismatch between the first and second nodes to generate the charging energy.
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Citations
20 Claims
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1. A propulsion system comprising:
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a motor drive; a direct current (DC) link electrically coupled to the motor drive; a first leg coupled to the DC link and comprising a first power switch coupled in series with a second power switch via a first node; a first inductor coupled to the first node, wherein the first leg and inductor form a first bi-directional DC-DC voltage converter; a first energy storage device (ESD) electrically coupled to the first inductor; a second leg coupled to the DC link and comprising a third power switch coupled in series with a fourth power switch via a second node; a second inductor coupled to the second node, wherein the second leg and second inductor form a second bi-directional DC-DC voltage converter; a charging circuit comprising a transformer having a first terminal coupled to the first node and having a second terminal coupled to the second node; a second ESD coupled to receive charging energy from the transformer; and a controller coupled to the first and second legs and configured to cause a first variable voltage difference between the first and second nodes during an interleave duration of a frequency period to generate the charging energy, wherein the second ESD can be charged during operation of the motor drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of assembling a control system comprising:
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coupling a first energy storage device (ESD) to a first bi-directional DC-DC converter, the first bi-directional DC-DC converter comprising; a first pair of power switches coupled in series; and an inductor coupled to a first node formed between the first pair of power switches; coupling the first ESD to a second bi-directional DC-DC converter, the second bi-directional DC-DC converter comprising; a second pair of power switches coupled in series; and an inductor coupled to a second node formed between the second pair of power switches; coupling the first and second bi-directional DC-DC converters to a DC link; coupling the DC link to a motor drive; coupling a transformer of a charge circuit to the first and second nodes; coupling a second ESD to the charge circuit to receive a charge voltage therefrom; and coupling a controller to the first and second bi-directional DC-DC converters and configuring the controller to interleave control of the first and second bi-directional DC-DC converters to cause a variable voltage difference between the first and second nodes during an interleave portion of a frequency period to generate the charge voltage, wherein the second ESD can be charged during operation of the motor drive. - View Dependent Claims (13, 14, 15)
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16. An energy storage arrangement for an electrically powered system, the arrangement comprising:
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a first bi-directional DC-DC converter comprising; a first pair of power switches comprising a first power switch coupled in series with a second power switch via a first node; and a first inductor coupled to the first node; a first energy storage device coupled to the first inductor; a DC link comprising; a first bus coupled to the first bi-directional DC-DC converter; and a second bus coupled to the first bi-directional DC-DC converter; a second pair of power switches comprising; a third power switch coupled to the first bus; and a fourth power switch coupled to the second bus and coupled in series with the third power switch via a second node; a second inductor coupled to the first energy storage device; a transformer having a first winding comprising; a first terminal coupled to the first node; and a second terminal coupled to the second node; a second energy storage device coupled to receive a charge voltage from the transformer; a controller coupled to the first and second pairs of power switches and configured to cause a voltage difference between the first and second nodes during an interleave portion of a frequency period to generate the charge voltage; and an inductor switch coupled between the second inductor and the second node, wherein the controller is further configured to; close the inductor switch; and control the second pair of power switches to cause the second pair of power switches to boost a voltage of the first energy storage device to the DC link. - View Dependent Claims (17, 18, 19)
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20. A propulsion system comprising:
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a motor drive; a direct current (DC) link electrically coupled to the motor drive; a first leg coupled to the DC link and comprising a first power switch coupled in series with a second power switch via a first node; a first inductor coupled to the first node, wherein the first leg and inductor form a first bi-directional DC-DC voltage converter; a first energy storage device (ESD) electrically coupled to the first inductor; a second leg coupled to the DC link and comprising a third power switch coupled in series with a fourth power switch via a second node; a charging circuit comprising a transformer having a first terminal coupled to the first node and having a second terminal coupled to the second node; a second ESD coupled to receive charging energy from the transformer; and a controller coupled to the first and second legs and configured to cause a variable voltage difference between the first and second nodes during an interleave duration of a frequency period to generate the charging energy, wherein the second ESD can be charged during operation of the motor drive.
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Specification