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Method and device for improving working efficiency of wireless power transmission system when frequency drifts

A technology of wireless energy transmission and system frequency, applied in circuit devices, electrical components, etc., can solve the problem of limited efficiency, and achieve the effect of improving system efficiency

Active Publication Date: 2017-11-14
HUNAN UNIV OF ARTS & SCI
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Problems solved by technology

However, the efficiency of this method is limited

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  • Method and device for improving working efficiency of wireless power transmission system when frequency drifts
  • Method and device for improving working efficiency of wireless power transmission system when frequency drifts
  • Method and device for improving working efficiency of wireless power transmission system when frequency drifts

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Embodiment Construction

[0048] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] refer to figure 1 , a method for improving the working efficiency of a wireless power transfer system when the frequency drifts, comprising the following steps:

[0050] Step 1: Build a magnetically coupled resonant wireless power transfer system model;

[0051] Step 2: establishing an equivalent circuit of the magnetically coupled resonant wireless power transmission system, and obtaining an equivalent equation of the equivalent circuit;

[0052] Step 3: When the system frequency ω drifts, the input impedance angle θ function and the system efficiency η function are derived according to the equivalent equation;

[0053] Step 4: Set the change range and step size of the load resistance;

[0054] Step 5: According to the load resistance...

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Abstract

The invention relates to a method and a device for increasing working efficiency of a wireless power transmission system during frequency drift. The method comprises the steps of: step1, establishing a magnetic coupling resonant type wireless power transmission system model; step 2, establishing an equivalent circuit of the wireless power transmission system, and acquiring an equivalent equation; step 3, deducing an input impedance angle theta function and a system efficiency eta function according to the equivalent equation when system efficiency omega drifts; step 4, setting a variation range and step length of load resistance; step 5, substituting a load resistance value into the impedance angle theta function to obtain the system efficiency omega, and further acquiring the system efficiency eta; step 6, acquiring the maximum value of system efficiency according to the current system efficiency value and a preset system efficiency value, and storing the maximum value of system efficiency as well as the load resistance value and the system frequency corresponding to the maximum value of system efficiency; and step 7, repeating steps 5 and 6 until the load resistance exceeds the preset range. The invention further comprises the corresponding device. When the system frequency drifts, the method and the device provided by the invention can effectively increase the working efficiency.

Description

technical field [0001] The invention relates to the field of wireless power transmission, in particular to a method and a device for improving the working efficiency of a wireless power transmission system when the frequency drifts. Background technique [0002] In recent years, wireless power transmission has been achieved using electromagnetic fields as the transmission medium. According to the different principles, wireless power transmission can be roughly divided into three categories: the first is inductive, which transmits large power, but the transmission distance is relatively short; the second is radial, which has good orientation. The transmission distance is long, but it has a great impact on the surrounding electromagnetic environment; the third type is resonant, also known as magnetic coupling resonant wireless power transmission technology, which can transmit longer distances with higher power and higher efficiency , compared with the inductive type, its tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12
Inventor 杨民生李建英李建奇曹玲玲王日兴
Owner HUNAN UNIV OF ARTS & SCI
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