Optimized Compensation Coils For Wireless Power Transfer System

• US 20170240055A1
• Filed: 02/18/2016
• Published: 08/24/2017
• Est. Priority Date: 02/18/2016
• Status: Active Grant

• Current Assignee: Denso International America Incorporated (DENSO Corporation)
• Original Assignee: Denso International America Incorporated (DENSO Corporation)
• Inventors: NGUYEN, Trong-Duy, WHITE, Jeff C.
• Granted Patent: US 10,144,301 B2
• Time in Patent Office: Days
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/34 Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles positioning means for charging devices using inductive energy transfer B60L53/38
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A wireless power transfer system for charging a battery located in a vehicle includes a primary side network and a secondary side network. The primary side network includes a transmitting coil and a primary side compensation network. The primary side compensation network includes a primary compensation coil. The secondary side network includes a receiving coil and a secondary side compensation network. The secondary compensation network includes a secondary compensation coil. The primary compensation coil and the secondary compensation network has one of an unipolar coil design and a bipolar coil design, and the transmitting coil and the receiving coil has the other one of the unipolar coil design and the bipolar coil design.

Claims

1. A wireless power transfer system for charging an automobile battery, the wireless power transfer system comprising:

a primary side network including a transmitting coil, a primary side compensation network, and a plurality of primary magnetic cores, wherein the transmitting coil is configured to receive power from a power supply, and the primary side compensation network includes a primary compensation coil; and

a secondary side network that is inductively coupled to the primary side network and is configured to receive power from the primary side network, the secondary side network including a receiving coil, a secondary side compensation network, and a plurality of secondary magnetic cores, wherein the receiving coil is configured to induce a voltage in response to the transmitting coil receiving power, and the secondary side compensation network includes a secondary compensation coil, wherein;

the primary compensation coil and the secondary compensation network has one of an unipolar coil design and a bipolar coil design, and

the transmitting coil and the receiving coil has the other one of the unipolar coil design and the bipolar coil design.

2. The wireless power transfer system of claim 1 wherein the primary compensation coil and the secondary compensation network have the unipolar coil design and the transmitting coil and the receiving coil have the bipolar coil design.

3. The wireless power transfer system of claim 1 wherein the primary compensation coil and the secondary compensation network have the bipolar coil design and the transmitting coil and the receiving coil have the unipolar coil design.

4. The wireless power transfer system of claim 1 further comprising:

a power converter network configured to convert an AC voltage from the power supply into an input AC voltage, wherein the transmitting coil receives voltage based on the input AC voltage.

5. The wireless power transfer system of claim 1 further comprising:

a power converter network configured to convert a DC voltage from the power supply into an input AC voltage, wherein the transmitting coil receives voltage based on the input AC voltage.

6. The wireless power transfer system of claim 1 wherein:

the primary side compensation network includes a primary series capacitor and a primary side parallel capacitor,

the transmitting coil is serially coupled to the primary series capacitor,

the primary series capacitor is serially coupled to the primary compensation coil, and

the primary side parallel capacitor is coupled to the transmitting coil in parallel.

7. The wireless power transfer system of claim 1 wherein:

the secondary side compensation network includes a secondary series capacitor and a secondary parallel capacitor,

the receiving coil is serially coupled to the secondary series capacitor,

the secondary series capacitor is serially coupled to the secondary compensation coil, and

the secondary parallel capacitor is coupled to the receiving coil in parallel.

8. The wireless power transfer system of claim 1 wherein the secondary side network further includes a rectifier network connected to the secondary side compensation network.

9. The wireless power transfer system of claim 1 wherein the secondary side network further includes an output tuner network and a rectifier network, wherein the rectifier network is connected to the secondary side compensation network and the output tuner network is connected to the rectifier network.

10. The wireless power transfer system of claim 1 wherein:

the bipolar coil design has two coil poles of equal coil area, and a current flowing in one of the two coil poles is in direction opposite to a current flowing in the other one of the two coil poles, and

the unipolar coil design has a single coil pole.

11. The wireless power transfer system of claim 1 wherein, with the primary compensation coil and the secondary compensation coil having the unipolar coil design and the transmitting coil and the receiving coil having the bipolar coil design:

the primary compensation coil and the secondary compensation coil each have a single coil pole and the transmitting coil and the receiving coil each have two coil poles, and

an area of each of the two coil poles of the bipolar coil design is configured such that a magnetic flux generated by the two coil poles is equal in magnitude to a magnetic flux of the single coil pole of the unipolar coil design.

12. The wireless power transfer system of claim 1 wherein, with the primary compensation coil and the secondary compensation coil having the bipolar coil design and the transmitting coil and the receiving coil having the unipolar coil design:

the primary compensation coil and the secondary compensation coil each have two coil poles and the transmitting coil and the receiving coil each have a single coil pole, and

an area of the single coil pole of the unipolar coil design is configured such that a magnetic flux generated by the single coil pole is equal in magnitude to a magnetic flux of the two coil poles of the bipolar coil design.

13. The wireless power transfer system of claim 1 wherein the transmitting coil and the primary compensation coil are coupled to the plurality of primary magnetic cores.

14. The wireless power transfer system of claim 1 wherein the receiving coil and the secondary compensation coil are coupled to the plurality of secondary magnetic cores.

15. A wireless power transfer system for charging a battery located in a vehicle, the wireless power transfer system comprising:

a transmitting coil located external to the vehicle; and

a primary compensation network including a primary compensation coil, wherein the transmitting coil is configured to receive an alternating current from a power supply via the primary compensation network, the transmitting coil has one of an unipolar coil design and a bipolar coil design, and the primary compensation coil has the other one of the unipolar coil design and the bipolar coil design.

16. The wireless power transfer system of claim 15 wherein:

with the primary compensation coil having the unipolar coil design and the transmitting coil having the bipolar coil design, the primary compensation coil has a single coil pole and the transmitting coil has two coil poles, and

an area of each of the two coil poles of the transmitting coil is configured such that a magnetic flux generated by the two coil poles is equal in magnitude to a magnetic flux of the single coil pole of the primary compensation coil.

17. The wireless power transfer system of claim 15 wherein:

with the primary compensation coil having the bipolar coil design and the transmitting coil having the unipolar coil design, the primary compensation coil has two coil poles and the transmitting coil has a single coil pole, and

an area of the single coil pole of the transmitting coil is configured such that a magnetic flux generated by the single coil pole is equal in magnitude to a net magnetic flux of the two coil poles of the primary compensation coil.

18. A wireless power transfer system for charging a battery located in a vehicle, the wireless power transfer system comprising:

a receiving coil arranged along an underside of the vehicle and configured to generate an alternating current based on a voltage induced by a transmitting coil located external to the vehicle; and

a compensation network electrically connected to the receiving coil and including a compensation coil, wherein the compensation coil transmits the alternating current from the receiving coil to the battery, the receiving coil has one of an unipolar coil design and a bipolar coil design, and the compensation coil has the other one of the unipolar coil design and the bipolar coil design.

19. The wireless power transfer system of claim 18 wherein:

with the compensation coil having the unipolar coil design and the receiving coil having the bipolar coil design, the compensation coil has a single coil pole and the receiving coil has two coil poles, and

an area of each of the two coil poles of the receiving coil is configured such that a magnetic flux generated by the two coil poles is equal in magnitude to a magnetic flux of the single coil pole of the compensation coil.

20. The wireless power transfer system of claim 18 wherein:

with the compensation coil having the bipolar coil design and the receiving coil having the unipolar coil design, the compensation coil has two coil poles and the receiving coil has a single coil pole, and

an area of the single coil pole of the receiving coil is configured such that a magnetic flux generated by the single coil pole is equal in magnitude to a net magnetic flux of the two coil poles of the compensation coil.