Charging system for mild hybrid vehicle

• US 9,242,570 B2
• Filed: 07/07/2014
• Issued: 01/26/2016
• Est. Priority Date: 12/06/2010
• Status: Active Grant

• Current Assignee: Egtronics Co., Ltd., Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Egtronics Co., Ltd., Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Kwangyeon, Lee, Jun Yong, Kang, Chan-Ho, Kim, Gyoung-Man, Jung, Eun-Jin, Kim, Hag-Wone
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US14/324,776
• Publication Number:
  US 20140320081A1
• Time in Patent Office: 568 Days
• Field of Search: 320/104, 320/107, 320/109, 320/134, 320/136
• US Class Current: 1/1
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 53/24 Using the vehicle's propulsion converter for charging
• CPC Class Codes: B60R 16/033 characterised by the use of electrical cells or batteries for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36
• CPC Class Codes: F02N 11/04 the motors being associated with current generators
• CPC Class Codes: F02N 11/0866 comprising several power sources, e.g. battery and capacitor or two batteries
• CPC Class Codes: H02J 1/108 using diodes blocking reverse current flow H02J1/12 takes precedence
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H02J 7/1438 in combination with power supplies for loads other than batteries
• CPC Class Codes: H02M 1/12 Arrangements for reducing harmonics from ac input or output
• CPC Class Codes: H02P 9/08 Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A charging system for a hybrid vehicle which prevents a super capacitor from being reverse charged. In the illustrative charging system a DC-DC converter is connected to the inverter and configured to receive the DC electricity from the inverter and drop voltage. A battery is configured to receive the DC electricity from the DC-DC converter and to be charged by the DC electricity. Finally, a means for preventing reverse charging is mounted on a path between the super capacitor and the battery and is configured to prevent energy from flowing from the battery to the super capacitor.

Claims

1. A charging system for a hybrid electric vehicle, comprising:

an engine;

an integrated starter and generator (ISG) connected to the engine and configured to generate AC electricity and to start the engine;

an inverter configured to convert the AC electricity generated at the ISG into DC electricity, to convert the DC electricity into the AC electricity, and to deliver the converted AC electricity to the ISG;

a super capacitor configured to receive the DC electricity from the inverter and be charged by the DC electricity;

a DC-DC converter connected to the inverter and the super capacitor and configured to receive the DC electricity from the inverter or the super capacitor and drop voltage;

a battery configured to receive the DC electricity from the DC-DC converter and to be charged by the DC electricity; and

a relay mounted on an electric path between the super capacitor and the battery and configured to prevent energy from flowing from the battery to the super capacitor when a voltage of the battery is greater than or equal to that of the super capacitor.

2. The charging system of claim 1, wherein the relay is mounted on the electric path between the super capacitor and the DC-DC converter.

3. The charging system of claim 1, wherein the relay is mounted on the electric path in the DC-DC converter.

4. The charging system of claim 1, wherein the relay is mounted on the electric path between the DC-DC converter and the battery.

5. The charging system of claim 1, wherein the DC-DC converter is a non-insulated buck type DC-DC converter.

6. The charging system of claim 1, wherein the relay is turned off if voltage of the battery is higher than that of the super capacitor.

7. A charging system for a hybrid electric vehicle, comprising:

an engine;

an integrated starter and generator (ISG) configured to generate electricity and to start the engine;

a super capacitor configured to receive and be charged by the electricity from the ISG;

a converter connected to the super capacitor and configured to receive the electricity from the super capacitor and drop voltage;

a battery configured to receive and be charged by the electricity from the converter; and

a relay mounted on an electric path between the super capacitor and the battery and configured to prevent energy from flowing from the battery to the super capacitor when a voltage of the battery is greater than or equal to that of the super capacitor.

8. The charging system of claim 7, wherein the relay is mounted on the electric path between the super capacitor and the converter.

9. The charging system of claim 7, wherein the relay is mounted on the electric path in the converter.

10. The charging system of claim 7, wherein the relay is mounted on the electric path between the converter and the battery.

11. The charging system of claim 7, wherein the converter receives DC electricity from the super capacitor and delivers the dropped DC voltage to the battery.

12. The charging system of claim 11, wherein the converter is a non-insulated buck type DC-DC converter.

13. The charging system of claim 7, wherein the relay is turned off if voltage of the battery is higher than that of the super capacitor.

14. A system for preventing reverse charging in a hybrid electric vehicle, comprising:

a super capacitor configured to receive and be charged by the electricity from a generator;

a converter connected to a super capacitor and configured to receive electricity from the super capacitor and drop voltage;

a battery configured to receive and be charged by the electricity from the converter; and

a relay mounted on an electric path between the super capacitor and the battery and configured to prevent energy from flowing from the battery to the super capacitor when a voltage of the battery is greater than or equal to that of the super capacitor.

15. The charging system of claim 14, wherein the relay is mounted on the electric path between the super capacitor and the converter.

16. The charging system of claim 14, wherein the relay is mounted on the electric path in the converter.

17. The charging system of claim 14, wherein the relay is mounted on the electric path between the converter and the battery.

18. The charging system of claim 14, wherein the converter receives DC electricity from the super capacitor and delivers the dropped DC voltage to the battery.

19. The charging system of claim 18, wherein the converter is a non-insulated buck type DC-DC converter.

20. The charging system of claim 14, wherein the relay is turned off if voltage of the battery is higher than that of the super capacitor.