Control Method and Device for Wireless Power Transfer System of Motor Device

Patent metadata

Field	Value
Publication number	US-2016241084-A1
Application number	US-201415024349-A
Country	US
Kind code	A1
Filing date	Jun 19, 2014
Priority date	Sep 27, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A controlling method and device for a wireless power transfer system, wherein the wireless power transfer system includes a transmitting component and a receiving component, and further includes a contactless transformer & compensation (CT&C) circuit, and the controlling method includes: obtaining positional relationship information of the transmitting component and the receiving component; adjusting the number of coil turns of the transmitting component based on the positional relationship information, and making conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition. The abovementioned technical solution can provide a protection for a stable operation of the wireless power transfer system with a non-mechanical adjusting device, and the wireless charging can be achieved without using a mechanical adjusting device to align and range

First claim

What is claimed is:

1 . A controlling method for a wireless power transfer system, wherein, the wireless power transfer system comprises a transmitting component and a receiving component, and further comprises a contactless transformer & compensation circuit (CT&C), and the controlling method comprises:
obtaining positional relationship information of the transmitting component and the receiving component;
adjusting a number of coil turns of the transmitting component based on the positional relationship information, and making conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition.

2 . The controlling method of claim 1 , wherein,
coils of both the transmitting component and the receiving component use a planar distributed winding arrangement, the winding is divided into two segments that are respectively wound and connected in series consequently, and a sum of numbers of turns of the two segments is a total number of turns of the transmitting component or the receiving component.

3 . The controlling method of claim 1 , wherein,
the step of making conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition comprises: reducing an input impedance angle after the charging inverter bridge of the wireless power transfer system to be zero, and making the CT&C voltage gain equal to a given gain.

4 . The controlling method of claim 3 , wherein,
before obtaining positional relationship information of the transmitting component and the receiving component, the method further comprises: generating a mapping relationship between the number of coil turns of the transmitting component and the positional relationship information of the transmitting component and the receiving component, and generating a mapping relationship table.

5 . The controlling method of claim 4 , wherein,
the step of adjusting a number of coil turns of the transmitting component based on the positional relationship information comprises: judging whether the mapping relationship comprises the positional relationship information, if not comprising, gradually shorting the coil from outermost of the coil of the transmitting component, and every time one turn of the coil is shorted, judging whether the conditions of the CT&C voltage gain characteristic and the input impedance characteristic after the charging inverter bridge of the wireless power transfer system meet the charging condition, and if the charging condition is met, completing the adjustment; recording the positional relationship information and a number of coil turns of the transmitting component corresponding to the positional relationship information into the mapping relationship table.

6 . The controlling method of claim 5 , wherein,
the adjusted number of coil turns of the transmitting component makes a difference of the numbers of the coil turns of the two segments be 0 or 1.

7 . The controlling method of claim 5 , wherein, the method further comprises:
if it is judged that the mapping relationship comprises the positional relationship information, and the number of coil turns of the transmitting component corresponding to the obtained position relationship information can make the wireless power transfer system charge normally, directly adjusting the number of coil turns of the transmitting component to be the number of coil turns of the transmitting component corresponding to the positional relationship information based on the mapping relationship; if a mapping data device comprises the obtained positional relationship information, but the number of coil turns of the transmitting component corresponding to the obtained positional relationship information can not make the wireless power transfer system charge normally, giving up the charging.

8 . A controlling device for a wireless power transfer system, wherein,
the wireless power transfer system comprises a transmitting component and a receiving component, and further comprises a contactless transformer & compensation circuit (CT&C), and the controlling device comprises: an auxiliary positioning device and a turn number adjusting device, wherein: the auxiliary positioning device is configured to: determine a position of the receiving component, obtain positional relationship information of the transmitting component and the receiving component, and sending the positional relationship information to the turn number adjusting device; the turn number adjusting device is configured to: receive the positional relationship information, adjust a number of coil turns of the transmitting component based on the positional relationship information, and make conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition.

9 . The controlling device of claim 8 , wherein,
the turn number adjusting device is provided at a ray that takes a midpoint of a coil plane as a starting point.

10 . The controlling device of claim 8 , wherein,
coils of the transmitting component and the receiving component use a planar distributed winding arrangement, the winding is divided into two segments that are respectively wound and connected in series consequently, and a sum of numbers of turns of the two segments is a total number of turns of the transmitting component or the receiving component.

11 . The controlling device of claim 8 , wherein,
the step of making conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition comprises: reducing an input impedance angle after the charging inverter bridge of the wireless power transfer system to be zero, and making the CT&C voltage gain equal to a given gain.

12 . The controlling device of claim 11 , wherein,
the device further comprises a mapping data device, wherein: the mapping data device is configured to: generate a mapping relationship between the number of coil turns of the transmitting component and the positional relationship information of the transmitting component and the receiving component, and generate a mapping relationship table.

13 . The controlling device of claim 12 , wherein,
the turn number adjusting device is configured to adjust the number of coil turns of the transmitting component based on the positional relationship information in the following manner: judging whether the mapping data device comprises the positional relationship information, if comprising, gradually shorting the coil from outermost of the coil of the transmitting component, and every time one turn of the coil is shorted, judging whether the conditions of the a CT&C voltage gain characteristic and the input impedance characteristic after the charging inverter bridge of the wireless power transfer system meet the charging condition, and if the charging condition is met, completing the adjustment; recording the positional relationship information and a number of coil turns of the transmitting component corresponding to the positional relationship information into the mapping relationship table.

14 . The controlling device of claim 13 , wherein,
the adjusted number of coil turns of the transmitting component makes a difference of the numbers of coil turns of the two segments be 0 or 1.

Assignees

• Zte Corp

Inventors

• Guo Cheng
• Tang Feiyun
• Fan Jie
• Luo Yong
• Zhou Jianping
• He Chuan
• Liu Chen
• Gao Yaoguang
• Liu Wei
• Qiu Beibei
• Wang Jing
• Liu Jianquan
• Chi Lin

Classifications

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• B60L53/126

  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 title

• H02J50/10 Primary

  using inductive coupling · CPC title

• B60L2210/40

  DC to AC converters · CPC title

• B60L53/39

  with position-responsive activation of primary coils · CPC title