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Wireless power transmission system for online load identification and load identification method

A technology of wireless energy transmission and magnetic energy, applied in the direction of measuring electricity, electrical components, circuit devices, etc., can solve the problems of inability to carry out power, cannot be carried out at the same time, imprecise impedance, etc., achieve high load identification accuracy, improve frequency selection ability, The effect of high energy efficiency

Inactive Publication Date: 2017-03-22
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, since the current research on power, efficiency, system stability, and system modeling in the field of wireless power transfer is based on known loads, not all system loads are known, and wireless power The load of the transmission system has variable and unknown characteristics. The change of the load will cause the operating frequency of the system to drift, deviate from the resonant frequency range of the system, and make the stability of the system worse, thus causing certain difficulties to the research of the ICPT system.
[0003] In order to solve this problem, the methods currently used are mostly based on the law of energy conservation, and the load size is obtained from the energy formula of the primary and secondary sides. However, due to the invisibility of energy and many factors ignored by this method, the calculated by this method Load values ​​are not very precise
For example, the document "Inductive Power Transfer System Parameter Identification and Constant Current Control" measures the zero-crossing point of the system's primary side resonant voltage and current waveform, and measures the load of the system according to the equal energy stored in the system at the zero-crossing point. However, this method is due to excessive The problem of zero point accuracy is that the measured impedance is not accurate; the literature "Load Identification Algorithm for Non-contact Power Transmission System" uses different system models to calculate the size of the load according to the nature of the load, but the pickup core of the secondary circuit The degree of coupling with the primary loop guide rail coil, the equivalent resistance of the guide rail coil and the change of the resonance frequency of the system will all affect the identification of the load, so it has a certain impact on the identification accuracy of the load
In addition, the common defect of the current load identification algorithm of the existing wireless power transmission system is that the power transmission cannot be performed while the load is identified, that is, the two working states of load identification and power transmission cannot be performed at the same time, and the load cannot be dynamically identified.

Method used

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  • Wireless power transmission system for online load identification and load identification method
  • Wireless power transmission system for online load identification and load identification method
  • Wireless power transmission system for online load identification and load identification method

Examples

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Embodiment 1

[0054] Embodiment one: if figure 1 , for a wireless power transmission system operating at a frequency of 20kHz, the inductance L of the fundamental wave coil in the primary side fundamental wave energy transmission link a1 The value is 10μΗ, the fundamental resonance compensation capacitor C p1 is 6.333μF, the fundamental capacitor C 1 is 0.7036μF, the inductance L of the primary side fundamental wave magnetic energy transmitting coil p1 is 100μΗ; the harmonic coil inductance L in the primary side harmonic energy emission link a3 The value is 3μΗ, the harmonic resonance compensation capacitor C p3 is 2.345µF, the harmonic capacitor C 3is 0.07254μF, the primary side harmonic magnetic energy transmitting coil inductance L p3 is 100μΗ, the coupling coefficient k is 0.2, and L in the secondary side energy receiving module s1 and L s2 Both are 100μΗ, secondary resonance compensation capacitor C s1 It is 0.3166μΗ, and the front stage DC power supply is 20V. The process of ...

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Abstract

The invention discloses a wireless power transmission system for online load identification and a load identification method suitable for use in the field of wireless charging. The wireless power transmission system comprises a high-frequency inverter, a primary-side fundamental wave energy transmission module, a primary-side harmonic energy transmission module, a secondary-side energy receiving module, a system load, a secondary-side signal processing and transmitting module, a primary-side signal receiving and processing module and a selector switch. When the system normally outputs power, the selector switch is turned off and is cut off the primary-side harmonic energy transmission module, energy from the primary-side fundamental wave energy transmission module is received through a secondary-side magnetic energy pick-up coil in the secondary-side energy receiving module and transferred to the load; and when dynamic load identification needs to be carried out, the selector switch is turned on and cut in the primary-side harmonic energy transmission module, a fundamental wave in load current of the system and the content and the size of harmonic current are extracted and detected, and an equation set for load resistance and reactance is built according to a superposition theorem, thereby dynamically identifying the property and the size of the load. Load identification is carried out by adopting a harmonic wave, the steps are simple, the energy utilization rate is high, energy transmission of the system is not affected by the load identification process and the load identification accuracy is high.

Description

technical field [0001] The invention relates to a wireless power transmission system, and is especially suitable for a wireless power transmission system and a load recognition method for online load recognition used in the field of wireless charging. Background technique [0002] The traditional way of power transmission is to transmit power from the grid to electrical equipment through connecting devices such as cables. Traditional power transmission requires a direct physical connection between power supply equipment and electrical equipment, and this connection will cause sparks or damage due to frequent friction and exposure, which not only greatly shortens the service life of electrical equipment, And it seriously threatens the safety of power supply, especially in coal mines, underwater and other occasions with harsh electrical environments, and may even cause major safety accidents. Therefore, under such market demand, wireless power transmission technology emerges ...

Claims

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Application Information

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IPC IPC(8): H02J50/12G01R31/00
CPCG01R31/00
Inventor 夏晨阳朱文婷陈锐马念刘利民朱从郭祥孙彦景陈俊
Owner CHINA UNIV OF MINING & TECH
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