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Self-adaptive impedance matching circuit design method of wireless rechargeable car

A technology of impedance matching and matching circuits, which is applied in the direction of electric vehicles, battery circuit devices, circuit devices, etc., can solve the problem of affecting Rin and Rout, restricting the application and promotion of wireless charging technology for electric vehicles, and the distance between the transmitting end and the receiving end is not fixed, etc. problem, achieving inefficiency

Inactive Publication Date: 2015-07-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Considering the charging environment of electric vehicles, the chassis heights of different vehicles are different, which makes the positions of the transmitter and receiver different from different models; and, for the same model, the height of the chassis and the ground will also vary depending on the vehicle The load is different, which makes the distance between the transmitter and the receiver not fixed, which affects the Rin and Rout
In addition, for different wireless power supply devices, their RSource and RLoad are different, resulting in the incompatibility of the impedance matching network, which also limits the application and promotion of electric vehicle wireless charging technology to a large extent.

Method used

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  • Self-adaptive impedance matching circuit design method of wireless rechargeable car
  • Self-adaptive impedance matching circuit design method of wireless rechargeable car
  • Self-adaptive impedance matching circuit design method of wireless rechargeable car

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specific Embodiment approach

[0021] When the wireless power supply system is connected and needs to supply power to the load, in order to ensure the maximum power transmission efficiency, Rin=R*Source, Rout=R*Load should be set. At this time, because the input impedance RSource of the input voltage source, the load impedance is RLoad (RSource and RLoad are usually 50Ohm), and the distance between the transmitting and receiving coils is not fixed, impedance transformation is required so that Rin=R*Source, Rout=R* Load. The specific implementation is as follows:

[0022] The matching detection circuit first detects the standing wave coefficient (VSWR) of the transmitting end and the receiving end, reflecting the ratio of the standing wave component of the electromagnetic wave. Here, the value is required to be less than 1.1) V1 and V2, and the optimization function f(V 1 ,V 2 )=1.1-max(V 1 ,V 2 ) and the optimization objective f(V 1 ,V 2 )>0, if the initial V1 and V2 meet the optimization objective, m...

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Abstract

The invention discloses a self-adaptive impedance matching technology and a self-adaptive impedance matching method applicable to an electric car wireless power supply system based on the electromagnetic coupling, and belongs to the field of wireless power supply. The method comprises the steps of self-adaptively adjusting the number of turns of secondary coils in an input / output end impedance matching circuit by adding a control network, rapidly searching an optimum number of turns of the secondary coils by adopting a genetic algorithm, monitoring the variation situation of current on the input / output end by virtue of numerical sampling, and judging whether the impedance matching is achieved or not. By utilizing the method, the input / output end impedance matching can be rapidly realized, and the maximum transmission efficiency of the wireless power supply system can be realized.

Description

technical field [0001] The invention relates to the field of electric vehicle charging, in particular to an adaptive impedance matching device for a transmitting end and a receiving end of an electric vehicle wireless charging system. The device is mainly aimed at the system transmission performance degradation caused by the impedance change caused by the unfixed distance between the transmitting and receiving coils in the wireless power supply system, especially for the system caused by the change of the input and output impedance of the wireless power supply system caused by the change of the chassis height of the electric vehicle The decline in performance improves the reliability and versatility of the electric vehicle wireless power supply system. Background technique [0002] Electric vehicles are an emerging technology that is currently being vigorously developed, and it is one of the effective ways to solve the current shortage of fossil energy. At present, in order...

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Application Information

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IPC IPC(8): H02J7/02B60L11/18H02J5/00
CPCH02J7/025
Inventor 陈国平刘天赋罗易堃
Owner CHONGQING UNIV OF POSTS & TELECOMM
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