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A frequency tracking and tuning method for a transmitter of a wireless power transmission device

A wireless power transmission and transmitter technology, applied in the output power conversion device, the conversion of DC power input to DC power output, and the conversion of irreversible DC power input to AC power output, which can solve the problem of poor frequency tracking effect and measurement error. Large and other problems, to achieve the effect of reducing reactive power, simple circuit, and accurate tuning

Active Publication Date: 2016-06-15
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to other reasons such as high-frequency noise, the measurement error of the phase difference of voltage and current is relatively large, and the effect of frequency tracking is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] A specific embodiment of the present invention is a minimum voltage-based method for frequency tracking and tuning at the transmitting end of a wireless power transmission device, the steps of which are as follows:

[0022] A. The control value of the current RMS value of the sending coil is set to I p ; Initially, set the rated operating frequency of the inverter to be the current operating frequency f 0 .

[0023] Control value I of the effective value of the current p It depends on the power-taking requirements of the power-taking equipment; usually, the control value I of the corresponding current effective value of the power-taking equipment with greater power p The bigger it is, but it should not exceed the RMS value of the rated current of the sending coil.

[0024] B. The transmitter controller controls the operating frequency of the inverter to be the current operating frequency f 0 ; Simultaneously, the sending end controller receives the detection value I...

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PUM

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Abstract

The invention discloses a frequency tracking and tuning method for a sending end of a wireless energy transmission device, which dynamically tracks the resonance frequency of the sending end by utilizing the principle that the voltage at the output end of a buck-boost direct-to-direct converter is minimum when the circuit resonates under constant current control conditions. That is, by continuously fine-tuning the operating frequency of the inverter to track the effective value of the voltage at the output of the buck-boost DC-DC converter, the effective value of the voltage is at the minimum value in real time and dynamically, so that the circuit at the transmitting end is closer to a fully resonant state, which not only reduces the transmission The reactive power at the end also makes the inverter at the sending end work in a soft switching state, which reduces the switching loss. Its tuning is more accurate and reliable, that is, the method of the present invention can realize higher-precision tuning, make the transmitting end closer to the ideal resonance state, make its active power higher, and better improve the transmission power and efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a frequency tracking and tuning method for a sending end of an inductive wireless power transmission device. Background technique [0002] Wireless power transmission technology is an emerging power transmission technology. When powering mobile equipment such as rail vehicles and electric vehicles, wireless power transmission technology overcomes the traditional power transmission technology that is easy to carbon deposits, generates contact sparks, and troublesome plugging operations. flaws, but has great potential for development. [0003] Compared with other wireless power transmission technologies, the inductive wireless power transmission method has better development and application prospects due to its unique advantages in high-power transmission. The inductive wireless power transmission device includes two parts: the sending end and the receiving end...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H02M7/42H02M3/00
Inventor 何正友李勇麦瑞坤林圣高仕斌
Owner SOUTHWEST JIAOTONG UNIV