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Dynamic wireless power transfer system control method

A wireless power transmission and control method technology, applied in electrical components, circuit devices, etc., can solve the problems of difficulty in ensuring the real-time requirements of the control system and the inability to guarantee the constant output power of the wireless power transmission system, so as to reduce complexity and improve Applicability, reducing the effect of mutual inductance measurement modules

Active Publication Date: 2019-11-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the dynamic movement of the vehicle, the mutual inductance between the transmitting coil and the receiving coil is constantly changing, and it cannot guarantee that the wireless power transfer system will maintain a constant output power during the dynamic movement.
And in the process of dynamic movement, it is difficult to guarantee the real-time requirements of the control system through the wireless communication feedback between the transmitting end and the receiving end

Method used

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  • Dynamic wireless power transfer system control method
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  • Dynamic wireless power transfer system control method

Examples

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Embodiment approach

[0051] As a preferred embodiment of the present invention, in step 4, the specific method for estimating the mutual inductance M of the current transmitting coil and the pickup coil is as follows:

[0052] Note that the equivalent load resistance at the receiving end viewed from the input end of the rectifier R is RLeq. According to the preset output power PO* and output voltage UO* of the system, it can be expressed as:

[0053]

[0054] The reflection impedance ZR of the receiving end at the transmitting end can be expressed as:

[0055]

[0056] Among them, XS is the equivalent impedance of the coil self-inductance LS at the receiving end and the resonant capacitor CS at the receiving end;

[0057] Then the inverter output impedance ZPT can be expressed by M and RLeq as:

[0058]

[0059] According to the pre-set system parameters, a standard with query table. The table is precomputed for different M and RLeq. In this lookup table, the with with the actual...

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Abstract

The invention discloses a dynamic wireless power transfer system control method. The method comprises the steps that 1, when a receiving coil is away from a transmitting coil, a DC-DC converter BC ina receiving end maintains inputting a short-circuit state, a receiving-end current IS is acquired continuously, and a transmitting-end circuit maintains a transmitting-end current IP as a constant value IP0; and 2, when the receiving end detects that the current IS is greater than a threshold IS0, it is indicated that the receiving coil is close to the transmitting coil at the moment, the DC-DC converter BC in the receiving end is started, and a system output voltage UO and a preset system reference voltage UO* are acquired to calculate a duty ratio Dm of the DC-DC converter BC in the main receiving end at a next moment. According to the method, under the condition of canceling communication between a transmitting end and the receiving end, it is guaranteed that the system output voltage is constant, and the complexity of a system is lowered; and by the adoption of the control method, it is needless to measure mutual inductance between the transmitting coil and the receiving coil, a mutual inductance measurement module is omitted, and the applicability in a dynamic running environment is improved.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a method and system for optimizing power distribution of a dynamic wireless power transmission system. Background technique [0002] The wireless power transmission system uses the principle of high-frequency electromagnetic field near-field coupling, uses high-frequency magnetic field as the transmission medium, and realizes the wireless transmission of electric energy through the magnetic field coupling between the transmitting coil and the receiving coil. The wireless power transmission system is mainly composed of two parts, one is the transmitter connected to the power supply side, and the other is the receiver on the load side. The energy is transmitted from the transmitter to the receiver through electromagnetic induction. The existing wireless power transmission system is mainly composed of a DC power supply at the transmitting end, an inverter, a transmitting c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/10H02J50/12
CPCH02J50/10H02J50/12
Inventor 何正友刘野然麦瑞坤
Owner SOUTHWEST JIAOTONG UNIV
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