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Noncontact testing method for inherent frequency and quality factor of resonance coil

A technology of natural frequency and quality factor, which is applied in the field of measurement of natural frequency and quality factor of resonant coils, and can solve the problems of error, inaccurate measurement results, and large impedance.

Inactive Publication Date: 2015-05-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that when the natural frequency and quality factor of the resonant coil are measured by the direct measurement method, errors will be introduced, and the impedance is too large, resulting in inaccurate measurement results. contact measurement method

Method used

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  • Noncontact testing method for inherent frequency and quality factor of resonance coil
  • Noncontact testing method for inherent frequency and quality factor of resonance coil
  • Noncontact testing method for inherent frequency and quality factor of resonance coil

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specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the non-contact method for measuring the natural frequency and quality factor of a resonant coil described in this embodiment includes the following steps:

[0023] Step 1, connect the standard coil 1 of the impedance measuring device;

[0024] Step 2. Utilize the impedance measuring device to measure the real part Real(Z) of the impedance of the standard coil 1 S (f)) and imaginary part Imag(Z S (f)) a curve varying with frequency, the range of said frequency is 0-20M; Z represents impedance;

[0025] Step 3. Coupling the standard coil 1 and the coil to be tested through a weak magnetic field strength;

[0026] Step 4: Utilize the impedance measuring device to measure the real part Real(Z) of the impedance of the standard coil 1 0 (f)) and imaginary part Imag(Z 0 (f)) a curve that varies with frequency, f represents frequency, and the range of said frequency is 0-20M;

[0027] Step ...

specific Embodiment approach 2

[0034] Specific Embodiment 2: This embodiment is a further limitation of the non-contact measurement method for the natural frequency and quality factor of the resonant coil described in Embodiment 1. In this embodiment, the impedance measurement device is an impedance analyzer or a network analyzer instrument.

specific Embodiment approach 3

[0035] Specific Embodiment 3: This embodiment is a further limitation of the non-contact measurement method for the natural frequency and quality factor of the resonant coil described in Embodiment 1. In this embodiment, the connection between the impedance measuring device and the standard coil 1 adopts coaxial cable or twisted pair.

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Abstract

The invention provides a noncontact testing method for inherent frequency and quality factor of a resonance coil, relates to a measurement technology of the inherent frequency and quality factor of a self-resonance coil adopting own distributed capacitance in a magnetic coupling resonant antenna electricity energy transmission system, and aims at solving the problem that introduced error and large impendence lead to accurate measurement result during measuring the inherent frequency and the quality factor of the resonance coil by the direct measuring method. The method comprises the steps of activating a coil to be measured through a primary magnetic field generated by a small standard coil to obtain impedance parameters; calculating the impedance characteristics of the standard coil and comparing with the impedance characteristics under the condition that the coil to be measured is not added so as to obtain the impedance information of the coil to be measured; measuring and calculating the inherent frequency f0 and the quality factor of the self-resonance coil. The method has the characteristics of being small in error, high in measurement precision, and convenient to measure; the accuracy is increased by at least 20% by being compared with that of the direct measuring method.

Description

technical field [0001] The invention relates to the measurement technology of the natural frequency and quality factor of the resonant coil in the magnetic coupling resonant wireless power transmission system. Background technique [0002] The transmission coil applied to the magnetically coupled resonant wireless power transmission system is responsible for the mutual conversion of magnetic field and electric field energy, and its own resonance is mainly realized by the resonant circuit composed of coil inductance and resonant capacitor. The natural frequency of the resonant circuit determines the operating frequency of the system, and the quality factor of the resonant circuit is an important parameter that affects the transmission efficiency. Since the use of concentrated capacitance has solder joint resistance and its own internal resistance, it is easy to reduce the quality factor of the coil, so the use of the distributed capacitance of the coil itself to realize the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R21/00
Inventor 朱春波毛世通魏国逯仁贵宋凯李阳
Owner HARBIN INST OF TECH
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