Combined converter circuit

Patent metadata

Field	Value
Publication number	US-11235676-B2
Application number	US-201916446417-A
Country	US
Kind code	B2
Filing date	Jun 19, 2019
Priority date	Jun 19, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

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.

First claim

What is claimed is:

1. 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.

2. The power module of claim 1 , further comprising a transformer between the main power supply and the auxiliary power supply a first H-bridge converter on a primary side of the transformer.

3. The power module of claim 2 , further comprising a second H-bridge converter on a secondary side of the transformer.

4. The power module of claim 1 , further comprising a boost mode wherein the auxiliary supply charges the power supply.

5. The power module of claim 1 , wherein the first switch is a first n-channel MOSFET and the second switch is a second n-channel MOSFET; and
wherein a source of the first n-channel MOSFET is electrically coupled to a drain of the second n-channel MOSFET.

6. The combined converter circuit of claim 1 , wherein the first bi-directional converter operates at a 50% duty ratio.

7. The combined converter circuit of claim 1 , wherein the DC-BUS voltage is half the main power supply voltage.

8. The combined converter circuit of claim 1 , wherein a pair of capacitors split the voltage of the stepped down DC-BUS.

9. 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.

10. The electric vehicle of claim 9 , further comprising a transformer between the main power supply and the auxiliary power supply a first H-bridge converter on a primary side of the transformer.

11. The electric vehicle of claim 10 , further comprising a second H-bridge converter on a secondary side of the transformer.

12. The electric vehicle of claim 9 , further comprising a boost mode wherein the auxiliary supply charges the power supply.

13. The electric vehicle of claim 9 , wherein the first switch is a first n-channel MOSFET and the second switch is a second n-channel MOSFET.

14. The electric vehicle of claim 13 , wherein a source of the first n-channel MOSFET is electrically coupled to a drain of the second n-channel MOSFET.

15. The electric vehicle of claim 9 , wherein the first bi-directional converter operates at a 50 percent duty ratio.

16. The electric vehicle of claim 9 , wherein the DC-BUS voltage is half the main power supply voltage.

17. The electric vehicle of claim 9 , wherein a pair of capacitors split the voltage of the DC-BUS.

Assignees

• Karma Automotive Llc

Inventors

• Tang Lixin
• Niu Geng
• Kulai Harshith

Classifications

• B60L2210/14

  Boost converters · CPC title

• H02M3/1582

  Buck-boost converters (H02M3/1584 takes precedence) · CPC title

• B60L53/53

  Batteries · CPC title

• H02M3/33561

  having more than one ouput with independent control · CPC title

• Y02T90/12

  Electric charging stations · CPC title