Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system

A technology for transmitting coils and quality factors, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of inability to accurately test the internal resistance of the coil, calculate the coil, etc., and achieve the effect of eliminating external interference, accurate results, and accurate methods.

Active Publication Date: 2018-11-23
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem in the background technology that the internal resistance of the coil cannot be accurately tested and the accurate quality factor of the coil can be calculated when the o

Method used

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  • Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system
  • Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system
  • Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system

Examples

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Example Embodiment

[0047] Example 1

[0048] figure 1 It is a flow chart of a method for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system according to a preferred embodiment of the present invention. like figure 1 As shown, the method 100 for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system according to this preferred embodiment starts from step 101 .

[0049] In step 101, the self-inductance L of the transmission coil is tested under low frequency conditions;

[0050] In step 102, test the feed coil at the transmission coil operating frequency f 0 When the internal resistance R', wherein, the size of the feeding coil is not larger than the transmission coil, the number of turns is less than the number of turns of the transmission coil;

[0051] In step 103, the transmission coil is placed in the middle of the two identical and coaxial feeding coils, the scattering parameters of th...

Example Embodiment

[0085] Embodiment 2

[0086] In this preferred embodiment, a copper wire with a wire diameter of 4 mm is used to wind a circular spiral transmission coil with 5 turns, a wire spacing of 1 cm, and a radius of 10 cm. It is necessary to test its working frequency f. 0 = quality factor at 5MHz.

[0087] In step 1, the self-inductance of the transmission coil is L=20uH when the test frequency is 1KHz using an impedance analyzer.

[0088] In step 2, use a copper wire with a wire diameter of 4 mm to wind two identical feeding coils with a radius of 10 cm, and directly test their working frequency f through an impedance analyzer. 0 When =5MHz, the internal resistance is R'=0.2Ω.

[0089]In step 3, place the circular helical transmission coil in the middle of the two coaxial feed coils, use a network analyzer to test the scattering parameters of the two feed coil systems, and set the frequency corresponding to the maximum value of the scattering parameter 20MHz as the transmission co...

Example Embodiment

[0095] Embodiment 3

[0096] In this preferred embodiment, a copper wire with a wire diameter of 8 mm is used to wind a square helical transmission coil with 8 turns, a wire spacing of 1 cm, and a radius of 20 cm. It is necessary to test its working frequency f. 0 = quality factor at 2MHz.

[0097] In step 1, when the test frequency is 5KHz using an impedance analyzer, the self-inductance of the transmission coil is L=50uH.

[0098] In step 2, two identical feeding coils with a radius of 20 cm are wound with a copper wire with a wire diameter of 8 mm. Directly test it at the operating frequency f through an impedance analyzer 0 When =2MHz, the internal resistance is R'=0.3Ω.

[0099] In step 3, place the square helical transmission coil in the middle of the two coaxial feed coils, use a network analyzer to test the scattering parameters of the two feed coil systems, and set the frequency corresponding to the maximum value of the scattering parameter, 8MHz, as the transmissi...

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Abstract

Technical scheme of the invention provides a method and device for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system. Aiming at a condition thatthe stray capacitance of a transmission coil cannot be neglected, the method and device employs a feed coil and an additional high-frequency resonant capacitor for indirect testing, accurately test the internal resistance of the transmission coil under the high-frequency condition, and determines the quality factor of the transmission coil according to the internal resistance. Through the testingof the self-inductance and mutual inductance of the coil under a low-frequency condition, the method and device eliminate the impact from a parasitic parameter of the coil, employ an external tuning capacitor as a compensation capacitor to adjust the self-resonant frequency of the transmission coil, facilitate the testing of the coil at the working frequency, indirectly testing the internal resistance and quality factor when the coil works at the working frequency through the coupling effect of the feed coil and the transmission coil, and eliminates the external interference.

Description

technical field [0001] The present invention relates to the field of wireless power transmission, and more specifically, to a method and device for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system. Background technique [0002] The wireless power transmission technology mainly transmits electric energy through the magnetic field. The power supply end and the load end do not need to be directly connected by wires, which will make the production, transmission, distribution and use of electric energy wider and more diverse. As the key to energy conversion in the wireless power transmission system, the transmission coil determines the transmission performance of the system. As an electrical parameter of the transmission coil, the quality factor can effectively characterize the transmission characteristics of the coil, and then quantitatively explore the transmission performance of the wireless power transmission system. Ho...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王松岑黄晓华吴晓康徐翀李松徐锦星
Owner CHINA ELECTRIC POWER RES INST
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