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US 11,235,676 B2Granted
Combined converter circuit
AssigneeKarma Automotive LLC
InventorsLixin Tang, Geng Niu, Harshith Kulai
Life of this patent
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Abstract
A combined bi-directional converter and an auxiliary power module circuit for an 800V battery of an electric vehicle. The converter providing a stepped voltage of 400V with a duty ratio of 50 percent. The combined circuit comprises a high voltage side and a low voltage side. A transformer provides an interface between the high voltage side and the low voltage side. The combined circuit comprises a buck and boost mode.
Claims17
A power module for an electric vehicle comprising:
- a main power supply configured to supply DC power;
- a first bi-directional converter configured to step down a main power supply voltage from the main power supply to a stepped down DC-BUS;
- a second bi-directional converter electrically coupled with the first bi-directional converter, wherein the second bi-directional converter is configured to convert the main power supply voltage to charge an auxiliary power supply;
- a first switch selectively connecting the main power supply to the DC-BUS, wherein a DC-BUS voltage is lower than the main voltage and higher than an auxiliary power supply voltage;
- a second switch in series connection with the first switch;
- and
- wherein the first bi-directional converter includes an inductor configured to filter current to the DC-BUS, wherein the inductor is parallel to the second switch.
4 more elements
An electric vehicle having an auxiliary power module comprising:
- a propulsion motor configured to drive the electric vehicle;
- a main power supply to power the propulsion motor through a DC-BUS;
- a first bi-directional converter configured to step down a main power supply voltage from the main power supply to the DC-BUS;
- a second bi-directional converter electrically coupled to the first bi-directional converter, wherein the second bi-directional converter is configured to convert the main power supply voltage to charge an auxiliary power supply;
- a first switch selectively connecting the main power supply to the DC-BUS, wherein a DC-BUS voltage is lower than the main power supply voltage and higher than an auxiliary power supply voltage;
- a second switch in series connection with the first switch;
- and
- wherein the first bi-directional converter includes an inductor configured to filter current to the DC-BUS, wherein the inductor is parallel to the second switch.
5 more elements
Dependencies are inferred from the claim text.