CN104614595A - Noncontact testing method for inherent frequency and quality factor of resonance coil - Google Patents
Noncontact testing method for inherent frequency and quality factor of resonance coil Download PDFInfo
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- CN104614595A CN104614595A CN201510076599.1A CN201510076599A CN104614595A CN 104614595 A CN104614595 A CN 104614595A CN 201510076599 A CN201510076599 A CN 201510076599A CN 104614595 A CN104614595 A CN 104614595A
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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
The present invention relates to the measuring technique of resonance coil natural frequency and quality factor in magnetic coupling resonant radio energy transmission system.
Background technology
The transmission coil being applied to magnet coupled resonant type wireless electric energy transmission system carries the task that magnetic field and electric field energy transform mutually, and the resonant tank that himself resonance is mainly formed by coil inductance and resonant capacitance realizes.The frequency of operation of the natural frequency decision systems of resonant tank, the quality factor of resonant tank are then the important parameters affecting transfer efficiency.Owing to utilizing centralized electric capacity to there is solder joint resistance and self internal resistance, easily reduce the quality factor of coil, so it is very big to utilize the distributed capacitance of coil self to realize the impact of self-resonance on wireless power transmission efficiency of coil.But can Railway Project be produced when directly measuring the parameter of this self-resonant coil: 1. the distribution parameter at coil and probe contacts place can bring great impact to the measurement result of system; 2. be the structure with inductance in parallel when distributed capacitance is equivalent to lumped parameter, resonance place's impedance is (without during internal resistance being infinity) greatly, and reflection loss is high, causes surveying instrument cannot Measurement accuracy, and measurement result does not even have confidence level.
Summary of the invention
When the object of the invention is to solve employing direct method of measurement measurement resonance coil natural frequency and quality factor, error can be introduced, and impedance is excessive, cause the inaccurate problem of measurement result, the contactless measurement of a kind of resonance coil natural frequency and quality factor is provided.
The contactless measurement of resonance coil natural frequency of the present invention and quality factor comprises the following steps:
Step one, impedance measurement device measurement standard coil to be connected;
Step 2, utilize the real part Real (Z of impedance measurement device measurement standard coil impedance
s(f)) and imaginary part Imag (Z
s(f)) with the curve of frequency change, the scope of described frequency is 0 ~ 20M;
Step 3, by standard coil with treat that test coil is intercoupled by Weak magentic-field intensity;
Step 4, utilize the real part Real (Z of impedance measurement device measurement standard coil impedance
0(f)) and imaginary part Imag (Z
0(f)) with the curve of frequency change, f represents frequency, and the scope of described frequency is 0 ~ 20M;
Step 5, calculating Real (Z
c(f)) and Imag (Z
c(f));
Real(Z
C(f))＝Real(Z
0(f))-Real(Z
S(f))，Imag(Z
C(f))＝Imag(Z
0(f))-Imag(Z
S(f))；
Step 6, make Imag (Z
c(f))=0, calculate the natural frequency f treating test coil
0;
Step 7, build new impedance plural number Z
c: Z
c=Real (Z
c(f))+i × Imag (Z
c(f)), and calculate Z
cmould and Z
cthe maximal value of mould, wherein i represents imaginary number;
Step 8, calculating Z
cmould drop to (1/2) of described maximal value
(1/2)times time corresponding two Frequency point f
1and f
2, and calculate Z
cthe 3db bandwidth deltaf f=f of mould
1-f
2, finally calculate the quality factor q treating test coil:
The primary magnetic field that said method utilizes a mini standards coil to produce excites to be treated test coil thus obtains impedance parameter.By calculating the impedance operator of standard coil and comparison does not add impedance operator when the test coil, the impedance information treating test coil can be obtained, thus measuring coil natural frequency f
0with the method for quality factor.It is little that this method has introducing error, and measuring accuracy is high, measures feature easily.Compared with direct measuring method, accuracy improves at least 20%.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the contactless measurement of resonance coil natural frequency of the present invention and quality factor;
Fig. 2 is the real part of impedance measured of step 2 and the imaginary part curve with frequency change, and wherein 2 represent imaginary parts, and 3 represent real parts;
Fig. 3 is the real part of impedance measured of step 4 and the imaginary part curve with frequency change, and wherein 4 represent real parts, and 5 represent imaginary parts;
Fig. 4 is step 7 middle impedance plural number Z
creal part and imaginary part with the curve of frequency change; Wherein 6 represent real part, and 7 represent imaginary part;
Fig. 5 is step 7 middle impedance plural number Z
cmould with the curve of frequency change;
In Fig. 2 to Fig. 5, horizontal ordinate represents angular frequency, and ordinate represents the real part of impedance and the value of imaginary part.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, the resonance coil natural frequency described in present embodiment and the contactless measurement of quality factor comprise the following steps:
Step one, impedance measurement device measurement standard coil 1 to be connected;
Step 2, utilize the real part Real (Z of impedance measurement device measurement standard coil 1 impedance
s(f)) and imaginary part Imag (Z
s(f)) with the curve of frequency change, the scope of described frequency is 0 ~ 20M; Z represents impedance;
Step 3, by standard coil 1 with treat that test coil is intercoupled by Weak magentic-field intensity;
Step 4, utilize the real part Real (Z of impedance measurement device measurement standard coil 1 impedance
0(f)) and imaginary part Imag (Z
0(f)) with the curve of frequency change, f represents frequency, and the scope of described frequency is 0 ~ 20M;
Step 5, calculating Real (Z
c(f)) and Imag (Z
c(f));
Real(Z
C(f))＝Real(Z
0(f))-Real(Z
S(f))，Imag(Z
C(f))＝Imag(Z
0(f))-Imag(Z
S(f))；
Step 6, make Imag (Z
c(f))=0, calculate the natural frequency f treating test coil
0; Here computation process is actually searching and makes Imag (Z
c(f))=0 or closest to 0 Frequency point, this Frequency point is f
0;
Step 7, build new impedance plural number Z
c: Z
c=Real (Z
c(f))+i × Imag (Z
c(f)), and calculate Z
cmould and Z
cthe maximal value of mould, wherein i represents imaginary number;
Step 8, calculating Z
cmould drop to (1/2) of described maximal value
(1/2)times time corresponding two Frequency point f
1and f
2, and calculate Z
cthe 3db bandwidth deltaf f=f of mould
1-f
2, finally calculate the quality factor q treating test coil:
Present embodiment adopts a kind of standard coil 1 and treats the be coupled characteristic parameter that obtain treat test coil, i.e. the natural frequency f of test coil by Weak magentic-field intensity
0and quality factor q.Described standard coil 1 is small-sized single-turn circular coil, and its natural frequency is greater than 100MHz.Describedly treat that test coil is the self-resonant coil for magnet coupled resonant type wireless delivery of electrical energy, its self-induction of loop is self distributed inductance, and its resonant capacitance is self distributed capacitor.The natural frequency of self-resonant coil is the lowest frequency points in self multiple natural frequency point.Treat to there is magnetic Field Coupling between test coil and standard coil 1, its coupling coefficient is not less than 0.05.Described standard coil 1 is connected with impedance measurement device.Due to standard coil 1 and treat to there is not electrical contact between test coil, can avoid the problem that the direct method of measurement produces, the accuracy of measurement result improves 20%.Fig. 2 is to Figure 5 shows that measurement and calculation result.
Embodiment two: present embodiment is the further restriction of the contactless measurement to the resonance coil natural frequency described in embodiment one and quality factor, and in present embodiment, described impedance measurement device is electric impedance analyzer or network analyzer.
Embodiment three: present embodiment is the further restriction of the contactless measurement to the resonance coil natural frequency described in embodiment one and quality factor, in present embodiment, the connection of described impedance measurement device and standard coil 1 adopts concentric cable or twisted-pair feeder.
Embodiment four: present embodiment is the further restriction of the contactless measurement to the resonance coil natural frequency described in embodiment one and quality factor, in present embodiment, step 3 Plays coil 1 and treat that the coupling coefficient between test coil is 0.01 ~ 0.5.
Claims (4)
1. the contactless measurement of resonance coil natural frequency and quality factor, is characterized in that: the method comprises the following steps:
Step one, impedance measurement device measurement standard coil (1) to be connected;
Step 2, utilize the real part Real (Z of impedance measurement device measurement standard coil (1) impedance
s(f)) and imaginary part Imag (Z
s(f)) with the curve of frequency change, the scope of described frequency is 0 ~ 20M;
Step 3, by standard coil (1) with treat that test coil is intercoupled by Weak magentic-field intensity;
Step 4, utilize the real part Real (Z of impedance measurement device measurement standard coil (1) impedance
0(f)) and imaginary part Imag (Z
0(f)) with the curve of frequency change, f represents frequency, and the scope of described frequency is 0 ~ 20M;
Step 5, calculating Real (Z
c(f)) and Imag (Z
c(f));
Real(Z
C(f))＝Real(Z
0(f))-Real(Z
S(f))，Imag(Z
C(f))＝Imag(Z
0(f))-Imag(Z
S(f))；
Step 6, make Imag (Z
c(f))=0, calculate the natural frequency f treating test coil
0;
Step 7, build new impedance plural number Z
c: Z
c=Real (Z
c(f))+i × Imag (Z
c(f)), and calculate Z
cmould and Z
cthe maximal value of mould, wherein i represents imaginary number;
Step 8, calculating Z
cmould drop to (1/2) of described maximal value
(1/2)times time corresponding two Frequency point f
1and f
2, and calculate Z
cthe 3db bandwidth deltaf f=f of mould
1-f
2, finally calculate the quality factor q treating test coil:
2. the contactless measurement of resonance coil natural frequency according to claim 1 and quality factor, is characterized in that: described impedance measurement device is electric impedance analyzer or network analyzer.
3. the contactless measurement of resonance coil natural frequency according to claim 1 and quality factor, is characterized in that: the connection of described impedance measurement device and standard coil (1) adopts concentric cable or twisted-pair feeder.
4. the contactless measurement of resonance coil natural frequency according to claim 1 and quality factor, is characterized in that: in step 3, standard coil (1) and treat that the coupling coefficient between test coil is 0.01 ~ 0.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076599.1A CN104614595A (en) | 2015-02-12 | 2015-02-12 | Noncontact testing method for inherent frequency and quality factor of resonance coil |
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| CN201510076599.1A CN104614595A (en) | 2015-02-12 | 2015-02-12 | Noncontact testing method for inherent frequency and quality factor of resonance coil |
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ID=53149131
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676002A (en) * | 2016-02-02 | 2016-06-15 | 大连海事大学 | Method for extracting quality factor of microstrip antenna |
| CN106645971A (en) * | 2017-01-24 | 2017-05-10 | 佛山市瑞福物联科技有限公司 | Method for testing belt packaging impedance of ultrahigh frequency RFID chip through resonance method |
| CN108008222A (en) * | 2017-12-05 | 2018-05-08 | 华南理工大学 | A kind of coupled resonators parameter extraction device and its extracting method |
| CN108872753A (en) * | 2018-07-17 | 2018-11-23 | 中国电力科学研究院有限公司 | The method and apparatus for testing transmission coil quality factor in high frequency wireless power transmission systems |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676002A (en) * | 2016-02-02 | 2016-06-15 | 大连海事大学 | Method for extracting quality factor of microstrip antenna |
| CN105676002B (en) * | 2016-02-02 | 2019-06-04 | 大连海事大学 | A kind of microstrip antenna quality factor extracting method |
| CN106645971A (en) * | 2017-01-24 | 2017-05-10 | 佛山市瑞福物联科技有限公司 | Method for testing belt packaging impedance of ultrahigh frequency RFID chip through resonance method |
| CN106645971B (en) * | 2017-01-24 | 2023-05-09 | 佛山市瑞福物联科技有限公司 | Method for testing package impedance of ultrahigh frequency RFID chip by using resonance method |
| CN108008222A (en) * | 2017-12-05 | 2018-05-08 | 华南理工大学 | A kind of coupled resonators parameter extraction device and its extracting method |
| CN108008222B (en) * | 2017-12-05 | 2023-06-16 | 华南理工大学 | Coupled resonator parameter extraction device and extraction method thereof |
| CN108872753A (en) * | 2018-07-17 | 2018-11-23 | 中国电力科学研究院有限公司 | The method and apparatus for testing transmission coil quality factor in high frequency wireless power transmission systems |
| CN108872753B (en) * | 2018-07-17 | 2022-05-17 | 中国电力科学研究院有限公司 | Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system |
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Application publication date: 20150513 |