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Impedance matching method based on circuit switching frequency

A circuit switch and impedance matching technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve the problems of system transmission efficiency decline, equivalent load deviation from optimal load, etc., and achieve impedance matching and stability The effect of transmission efficiency

Inactive Publication Date: 2019-03-26
STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the equivalent load of the system deviates from the optimal load, resulting in a decrease in system transmission efficiency

Method used

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  • Impedance matching method based on circuit switching frequency
  • Impedance matching method based on circuit switching frequency
  • Impedance matching method based on circuit switching frequency

Examples

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Embodiment 1

[0052] In order to stabilize the system efficiency at the optimal value and realize impedance matching suitable for applications where the load is high voltage, low current and large equivalent impedance value, the present invention provides a method to realize the maximum efficiency of the WPT system by changing the switching frequency of the Boost circuit Impedance matching method for transmission.

[0053] Refer to attached figure 1 , add the Boost circuit as shown in the figure between the rectifier bridge and the load of the IPT system. Boost impedance converter has two basic working modes, namely CCM mode and DCM mode. The operating conditions of the two modes are

[0054]

[0055] Referring to Figure 2, it shows the inductor current waveforms of the Boost impedance converter working in CCM and DCM modes. At t=0, Q is turned on, and the input voltage V 1 Added to both ends of the energy storage inductance L, the diode VD is reversely blocked, and the current flowi...

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Abstract

The invention relates to an impedance matching method based on a circuit switching frequency and belongs to the field of wireless energy transmission. For the problem of the reduction of system transmission efficiency due to the dynamic change of an equivalent load during the charging process of a WPT system battery, a Boost circuit is used, the impedance matching is achieved by changing the switching frequency of the Boost circuit, the input equivalent impedance of a secondary side is reduced, the reflection impedance is increased, the transmission efficiency of a coupling coil is improved, and the method is suitable for an application where the load has large voltage, low current and a large equivalent impedance value. On the basis of obtaining the impedance transformation relationship of the Boost circuit in a DCM mode and a CCM mode, the equivalent load can be maintained to be near an optimal load by adjusting a Boost switching frequency, and therefore, the maximum efficiency transmission is achieved.

Description

technical field [0001] The invention belongs to the field of wireless power transmission, in particular to an impedance matching method based on circuit switching frequency Background technique [0002] During the charging process of the battery load by the WPT system, the equivalent load of the battery will change. The charging process of the battery can be divided into several constant current charging stages. In each constant current charging stage, the voltage across the battery rises in a curve, so as the charging process progresses, the battery equivalent load R L In an upward trend. As a result, the equivalent load of the system deviates from the optimal load, resulting in a decrease in the transmission efficiency of the system. Therefore, when the equivalent load at both ends of the battery changes dynamically, impedance matching must be adopted to maintain efficient power transmission of the WPT system. [0003] In order to keep the equivalent load value on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/335
CPCH02M3/156H02M3/33523
Inventor 谢宝江秦建陈鑫刘瑞王林梅陈桑红张军达卢姬郑则诚罗扬帆李哲蒋雯洁夏瑀
Owner STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY
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