CN108872753A - The method and apparatus for testing transmission coil quality factor in high frequency wireless power transmission systems - Google Patents
The method and apparatus for testing transmission coil quality factor in high frequency wireless power transmission systems Download PDFInfo
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- CN108872753A CN108872753A CN201810784884.2A CN201810784884A CN108872753A CN 108872753 A CN108872753 A CN 108872753A CN 201810784884 A CN201810784884 A CN 201810784884A CN 108872753 A CN108872753 A CN 108872753A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The method and apparatus of transmission coil quality factor are directed to the ignorable situation of transmission coil parasitic capacitance in the test high frequency wireless power transmission systems that technical solution of the present invention provides, indirectly testing is carried out using feeder loop and additional high-frequency resonant capacitor, transmission coil internal resistance under high frequency condition is accurately tested, and determines the quality factor of transmission coil according to internal resistance.The present invention, which passes through, tests self-induction of loop and mutual inductance under low frequency condition, eliminate the influence of coil parasitic parameter, transmission coil self-resonant frequency is adjusted as compensating electric capacity using external tuning capacitance, convenient for parameter testing when coil working frequency, utilize the coupling of feeder loop and transmission coil, internal resistance and quality factor when its working frequency of indirectly testing, eliminate external interference.
Description
Technical field
The present invention relates to wireless power transmission fields, and more particularly, to a kind of test high frequency wireless power transmission systems
The method and apparatus of middle transmission coil quality factor.
Background technique
Wireless power transmission technology mainly transmits electric energy by magnetic field, and feeder ear and load end do not need the straight of conducting wire
It connects in succession, by the production for making electric energy, transmission & distribution and uses approach broader, mode is more diversified.Transmission coil is as wireless
The key that energy is converted in transmission system, determines the transmission performance of system.Quality factor is as transmission coil electrical parameter, energy
Efficient Characterization coil transmission characteristic, and then quantitatively probe into the transmission performance of wireless power transmission systems.But when wireless power transmission systems work
When frequency is higher, the parasitic capacitance of transmission coil itself can not be ignored, and changing occurs in equivalent-circuit model.Tradition utilizes resistance
Analysis resistant instrument directly tests the mode of quality factor, can not accurately test Coil resistance, and then is unable to get the accurate product of coil
Prime factor.
Summary of the invention
In order to solve can not accurately to test Coil resistance in background technique when radio system working frequency is higher and count
The technical issues of calculating coil accurate quality factor, the present invention provides transmission coils in a kind of test high frequency wireless power transmission systems
The method and apparatus of quality factor.Wherein, transmission coil quality factor in test high frequency wireless power transmission systems of the present invention
Method include：
The self-induction L of transmission coil is tested under low frequency condition；
It is f that feeder loop, which is tested, in transmission coil working frequency0When internal resistance R ', wherein the size of the feeder loop
No more than transmission coil, the circle number that number is less than transmission coil is enclosed；
Transmission coil is placed in two identical and coaxial feeder loop middles, tests two feeder loop systems
The scattering parameter of system, and using the corresponding frequency of the scattering parameter peak value as the self-resonant frequency f of transmission coilS；
According to the self-induction L and self-resonant frequency f of transmission coilSDetermine the parasitic capacitance C of transmission coilS；
One feeder loop and transmission coil are coaxially placed every sky, and tested between two coils under low frequency condition
Mutual inductance M, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, the equivalent resistance of the feeder loop is tested, and is set
The maximum equivalent resistance for setting test is Rmax, wherein as the compensating electric capacity C1When being connected in parallel on transmission coil both ends, transmission coil
Resonance frequency under high frequency condition is equal to its working frequency f0, the compensating electric capacity C1Value according to the self-induction L of transmission coil,
Working frequency f0With parasitic capacitance CSIt determines；
According to the maximum equivalent resistance R of the feeder loopmaxWith internal resistance R ', the self-induction L and mutual inductance M of transmission coil be true
Transmission coil is determined in working frequency f0When internal resistance R and quality factor
Further, the self-induction L and self-resonant frequency f according to transmission coilSDetermine the parasitic capacitance C of transmission coilS
Formula be：
Further, as the compensating electric capacity C1When root is connected in parallel on transmission coil both ends, transmission coil is under high frequency condition
Resonance frequency be equal to its working frequency f0, the compensating electric capacity C1Self-induction L, working frequency f of the value according to transmission coil0With
Parasitic capacitance CSDetermining formula is：
Further, according to the maximum equivalent resistance R of the feeder loopmaxWith internal resistance R ', the self-induction L of transmission coil with
And mutual inductance M determines transmission coil in working frequency f0When internal resistance R and quality factorFormula be：
According to another aspect of the present invention, the present invention provides transmission coil quality in a kind of test high frequency wireless power transmission systems
The device of the factor, described device include：
Feeder loop is connect with measuring unit, and and transmission coil every empty coaxial placement, wherein the feeder loop
Size be not more than transmission coil, circle number be less than transmission coil circle number；
Measuring unit is used to test the parameter of transmission coil and feeder loop at different frequencies,；
Compensating electric capacity, it is in parallel with the both ends of transmission coil, for making the resonance frequency of transmission coil under high frequency condition
Equal to the working frequency f of transmission coil0；
Data processing unit is connect with measuring unit, and the parameter for being transmitted according to measuring unit carries out data processing
To determine the quality factor of transmission coil.
Further, the measuring unit includes：
First measuring unit is connect with two feeder loops, for by transmission coil be placed in two it is identical
And when coaxial feeder loop middle, the scattering parameter of two feeder loop systems is tested, and by the scattering parameter peak value
Self-resonant frequency f of the corresponding frequency as transmission coilS；
Second measuring unit is used to directly test the self-induction L of transmission coil in low frequency condition and feeder loop is transmitting
The working frequency f of coil0When internal resistance R ', when coaxially placing a feeder loop and transmission coil every sky, in low frequency item
The mutual inductance M between two coils is tested under part, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, the feedback is tested
The maximum equivalent resistance R of electric coilmax；
Further, the data processing unit includes：
First computing unit is used for self-induction L and self-resonant frequency f according to transmission coilSDetermine posting for transmission coil
Raw capacitor CS, wherein calculate parasitic capacitance CSFormula be：
Second computing unit is used for the self-induction L according to transmission coil, working frequency f0With parasitic capacitance CSDetermine transmission
Coil Compensation capacitor C1, wherein calculate compensating electric capacity C1Formula be：
Third computing unit is used for the maximum equivalent resistance R according to the feeder loopmaxWith internal resistance R ', transmission coil
Self-induction L and mutual inductance M determine transmission coil in working frequency f0When internal resistance R and quality factorWherein, internal resistance R is calculated
And quality factorFormula be：
Further, first measuring unit is Network Analyzer, and second measuring unit is impedance analyzer.
Further, the compensating electric capacity is low-loss resonant capacitance, including high-frequency film capacitor, ceramic condenser and tile
Capacitor.
Further, the transmission coil is that snail is rectangular, snail is round, stereo spiral is rectangular or three-dimensional
Spiral circular coil is formed by litz wire, copper pipe or aluminum pipe coiling, and its resonance frequency is greater than the work frequency of wireless power transmission systems
Rate.
Further, the feeder loop is the planar square or planar rondure coil of coiling 1-2 circle, by litz wire, copper
Pipe or aluminum pipe coiling form, and self-induction is less than the 5% of transmission coil.
The method and dress of transmission coil quality factor in the test high frequency wireless power transmission systems that technical solution of the present invention provides
The drawbacks of setting for the ignorable situation of transmission coil parasitic capacitance, overcoming directly test coil quality factor, utilizes feedback
Electric coil and additional high-frequency resonant capacitor carry out indirectly testing, accurately transmission coil internal resistance under test high frequency condition, and according to
Internal resistance determines the quality factor of transmission coil, and therefore, the present invention has indirectly testing, as a result accurate advantage.
Firstly, testing self-induction of loop and mutual inductance under low frequency condition, the influence of coil parasitic parameter is eliminated；Secondly, utilizing
External tuning capacitance adjusts transmission coil self-resonant frequency as compensating electric capacity, changes its equivalent circuit, is convenient for coil working
Parameter testing when frequency；It is interior when its working frequency of indirectly testing finally, using the coupling of feeder loop and transmission coil
Resistance and quality factor, eliminate external interference.Each parameter needed for method and apparatus of the present invention are tested with quality factor
Premised on accuracy, based on the basic equivalence circuit of transmission coil, substantially it is suitable for each work post frequency range item of transmission coil
Quality factor and inner walkway under part, method are accurate and practical.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by：
Fig. 1 is transmission coil quality factor in the test high frequency wireless power transmission systems according to the preferred embodiment for the present invention
The flow chart of method；
Fig. 2 is transmission coil quality factor in the test high frequency wireless power transmission systems according to preferably truth mode of the invention
The structural schematic diagram of device；
The structural representation of device when Fig. 3 is the test transmission coil self-resonant frequency according to the preferred embodiment for the present invention
Figure；
Fig. 4 is to test transmission coil in the structure of the device of the internal resistance of working frequency according to the preferred embodiment for the present invention
Schematic diagram；
Fig. 5 is to be illustrated according to the test transmission coil of the preferred embodiment for the present invention in the circuit of the internal resistance of working frequency
Figure.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Embodiment one
Fig. 1 is transmission coil quality factor in the test high frequency wireless power transmission systems according to the preferred embodiment for the present invention
The flow chart of method.As shown in Figure 1, transmission coil quality in test high frequency wireless power transmission systems described in this preferred embodiment
The method 100 of the factor is since step 101.
In step 101, the self-induction L of transmission coil is tested under low frequency condition；
In step 102, testing feeder loop in transmission coil working frequency is f0When internal resistance R ', wherein the feed
The size of coil is not more than transmission coil, and circle number is less than the circle number of transmission coil；
In step 103, transmission coil is placed in two identical and coaxial feeder loop middles, tests two
The scattering parameter of feeder loop system, and using the corresponding frequency of the scattering parameter peak value as the self-resonant frequency of transmission coil
fS；
In step 104, according to the self-induction L and self-resonant frequency f of transmission coilSDetermine the parasitic capacitance C of transmission coilS；
In step 105, a feeder loop and transmission coil are coaxially placed every sky, and test two under low frequency condition
Mutual inductance M between coil, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, the equivalent of the feeder loop is tested
Resistance, and the maximum equivalent resistance that test is arranged is Rmax, wherein as the compensating electric capacity C1When being connected in parallel on transmission coil both ends,
Resonance frequency of the transmission coil under high frequency condition is equal to its working frequency f0, the compensating electric capacity C1Value according to transmission coil
Self-induction L, working frequency f0With parasitic capacitance CSIt determines；
In step 106, according to the maximum equivalent resistance R of the feeder loopmaxWith internal resistance R ', the self-induction L of transmission coil with
And mutual inductance M determines transmission coil in working frequency f0When internal resistance R and quality factor
Preferably, the self-induction L and self-resonant frequency f according to transmission coilSDetermine the parasitic capacitance C of transmission coilS's
Formula is：
Preferably, as the compensating electric capacity C1When root is connected in parallel on transmission coil both ends, transmission coil is under high frequency condition
Resonance frequency is equal to its working frequency f0, the compensating electric capacity C1Self-induction L, working frequency f of the value according to transmission coil0With post
Raw capacitor CSDetermining formula is：
Preferably, according to the maximum equivalent resistance R of the feeder loopmaxWith internal resistance R ', the self-induction L of transmission coil and
Mutual inductance M determines transmission coil in working frequency f0When internal resistance R and quality factorFormula be：
Fig. 2 is transmission coil quality factor in the test high frequency wireless power transmission systems according to preferably truth mode of the invention
The structure chart of device.As shown in Fig. 2, transmission coil quality in test high frequency wireless power transmission systems described in this preferred embodiment
The device 200 of the factor includes：
Feeder loop 201 is connect with measuring unit 202, and and transmission coil every empty coaxial placement, wherein the feedback
The size of electric coil is not more than transmission coil, and circle number is less than the circle number of transmission coil；
Measuring unit 202 is used to test the parameter of transmission coil and feeder loop at different frequencies,；
Compensating electric capacity 203, it is in parallel with the both ends of transmission coil, for making the resonance of transmission coil under high frequency condition
Frequency is equal to the working frequency f of transmission coil0；
Data processing unit 204 is connect with measuring unit 202, and the parameter for being transmitted according to measuring unit 202 carries out
Data processing is to determine the quality factor of transmission coil.
Preferably, the measuring unit 202 includes：
First measuring unit 221 is connect with two feeder loops 201, for by transmission coil be placed in two it is complete
When exactly the same and coaxial 201 middle of feeder loop, the scattering parameter of two feeder loop systems is tested, and by the scattering
Self-resonant frequency f of the corresponding frequency of parameter peak as transmission coilS。
The structural representation of device when Fig. 3 is the test transmission coil self-resonant frequency according to the preferred embodiment for the present invention
Figure.As shown in figure 3, when testing transmission coil self-resonant frequency, the first measuring unit 221 of described device 200 and two feedbacks
Electric coil 201 connects, and transmission coil is spaced empty coaxial placement in two feeder loops.
Second measuring unit 222 is used to directly test the self-induction L of transmission coil in low frequency condition and feeder loop is passing
The working frequency f of defeated coil0When internal resistance R ', when coaxially placing a feeder loop 201 and transmission coil every sky, low
The mutual inductance M between two coils is tested under the conditions of frequency, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, institute is tested
State the maximum equivalent resistance R of feeder loopmax。
Fig. 4 is to test transmission coil in the structure of the device of the internal resistance of working frequency according to the preferred embodiment for the present invention
Schematic diagram.As shown in figure 4, when testing internal resistance of the transmission coil in working frequency, the second measuring unit of described device 200
222 connect with single feeder loop 201, and feeder loop 201 and transmission coil are every empty coaxial placement, the transmission coil two
Hold Shunt compensation capacitor C1。
Fig. 5 is to be illustrated according to the test transmission coil of the preferred embodiment for the present invention in the circuit of the internal resistance of working frequency
Figure.As shown in figure 5, the equivalent circuit of feeder loop 201 is in series with a resistor for inductance, and connect with the second measuring unit 222, and
The equivalent circuit of transmission coil is after self-induction of loop is in series with a resistor, then with parasitic capacitance in parallel, and the parasitic capacitance CS
With compensating electric capacity C1Also in parallel.
Preferably, the data processing unit 204 includes：
First computing unit 241 is used for self-induction L and self-resonant frequency f according to transmission coilSDetermine transmission coil
Parasitic capacitance CS, wherein calculate parasitic capacitance CSFormula be：
Second computing unit 242 is used for the self-induction L according to transmission coil, working frequency f0With parasitic capacitance CSIt determines and passes
Defeated Coil Compensation capacitor C1, wherein calculate compensating electric capacity C1Formula be：
Third computing unit 243 is used for the maximum equivalent resistance R according to the feeder loopmaxWith internal resistance R ', transmission
The self-induction L and mutual inductance M of coil determine transmission coil in working frequency f0When internal resistance R and quality factorWherein, it calculates
Internal resistance R and quality factorFormula be：
Preferably, first measuring unit 221 is Network Analyzer, and second measuring unit 222 is impedance analysis
Instrument.
Preferably, the compensating electric capacity 203 is low-loss resonant capacitance, including high-frequency film capacitor, ceramic condenser and porcelain
Chip capacitor.
Preferably, the transmission coil is that snail is rectangular, snail is round, stereo spiral is rectangular or three-dimensional spiral shell
Circular coil is revolved, is formed by litz wire, copper pipe or aluminum pipe coiling, and its resonance frequency is greater than the work frequency of wireless power transmission systems
Rate.
Preferably, the feeder loop 201 is the planar square or planar rondure coil of coiling 1-2 circle, by litz wire, copper
Pipe or aluminum pipe coiling form, and self-induction is less than the 5% of transmission coil.
Embodiment two
In the preferred embodiment, be 5 circles using the copper wire winding circle number of line footpath 4mm, line spacing is 1cm, and radius is
The round screw thread transmission coil of 10cm need to test it in working frequency f0Quality factor when=5MHz.
In step 1, transmission coil self-induction is L=20uH when being 1KHz using impedance analyzer test frequency.
It in step 2, is 1 circle using the copper wire winding circle number of line footpath 4mm, radius is two identical feed lines of 10cm
Circle, it is directly tested by impedance analyzer in working frequency f0Internal resistance is the Ω of R '=0.2 when=5MHz.
In step 3, round screw thread transmission coil is placed in the middle of two coaxial feed coils, utilizes network analysis
Instrument tests the scattering parameter of two feeder loop systems, and enabling the corresponding frequency 20MHz of scattering parameter maximum value is oneself of transmission coil
Resonance frequency fs, i.e. fs=20MHz, then the parasitic capacitance of transmission coil be
In step 4, using high-frequency low-consumption capacitor combination at external compensating electric capacity And it is it is in parallel with transmission coil both ends.
In steps of 5, by a feeder loop and not connected compensating electric capacity C1Transmission coil every sky place, utilize impedance
Mutual inductance when analyzer test frequency is 1KHz between two coils is M=1uH.The relative position between two coils is fixed, will be mended
Repay capacitor C1It is parallel to transmission coil, using the equivalent resistance of impedance analyzer sweep check feeder loop, and tests and obtains
Maximum equivalent resistance be Rmax=200 Ω, then transmission coil is in working frequency f0The corresponding internal resistance of=5MHzFor：
Transmission coil is in working frequency f0Corresponding quality factor when=5MHzFor：
Embodiment three
In the preferred embodiment, be 8 circles using the copper wire winding circle number of line footpath 8mm, line spacing is 1cm, and radius is
The square spiral transmission coil of 20cm need to test it in working frequency f0Quality factor when=2MHz.
In step 1, using impedance analyzer test frequency be 5KHz when, transmission coil self-induction be L=50uH.
It in step 2, is 1 circle using the copper wire winding circle number of line footpath 8mm, radius is two identical feed lines of 20cm
Circle.It is directly tested by impedance analyzer in working frequency f0Internal resistance is the Ω of R '=0.3 when=2MHz.
In step 3, square spiral transmission coil is placed in the middle of two coaxial feed coils, utilizes network analysis
Instrument tests the scattering parameter of two feeder loop systems, and enabling the corresponding frequency 8MHz of scattering parameter maximum value is transmission coil from humorous
Vibration frequency fs, i.e. fs=8MHz, then the parasitic capacitance of transmission coil be
In step 4, using high-frequency low-consumption capacitor combination at external compensating electric capacity And it is it is in parallel with transmission coil both ends.
In steps of 5, by a feeder loop and not connected compensating electric capacity C1Transmission coil every sky place, utilize impedance
Mutual inductance when analyzer test frequency is 5KHz between two coils is M=2uH.The relative position between two coils is fixed, will be mended
Repay capacitor C1It is parallel to transmission coil, using the equivalent resistance of impedance analyzer sweep check feeder loop, and tests and obtains
Maximum equivalent resistance be Rmax=150 Ω, then transmission coil is in working frequency f0The corresponding internal resistance of=2MHzFor：
Transmission coil is in working frequency f0Corresponding quality factor when=2MHzFor：
Example IV
It in the preferred embodiment, is 20 circles, side length using the litz wire coiling circle number that number of share of stock is 500, line footpath is 4mm
For the close around planar square transmission coil of 50cm, it need to be tested in working frequency f0Quality factor when=800KHz.
In step 1, transmission coil self-induction is L=200uH when being 2KHz using impedance analyzer test frequency.
It in step 2, is 1 circle using the copper wire winding circle number of line footpath 2mm, side length is two identical feed lines of 40cm
Circle.It is directly tested by impedance analyzer in working frequency f0Internal resistance is the Ω of R '=0.2 when=800KHz.
In step 3, planar square-spiral transmission coil is placed in the middle of two coaxial feed coils, utilizes network
Analyzer tests the scattering parameter of two feeder loop systems, and enabling the corresponding frequency 1.5MHz of scattering parameter maximum value is transmission coil
Self-resonant frequency fs, i.e. fs=1.5MHz, then the parasitic capacitance of transmission coil be
In step 4, using high-frequency low-consumption capacitor combination at external compensating electric capacity And it is it is in parallel with transmission coil both ends.
In steps of 5, by a feeder loop and not connected compensating electric capacity C1Transmission coil every sky place, utilize impedance
Mutual inductance when analyzer test frequency is 2KHz between two coils is M=1.5uH.The relative position between two coils is fixed, it will
Compensating electric capacity C1It is parallel to transmission coil, using the equivalent resistance of impedance analyzer sweep check feeder loop, and is tested
The maximum equivalent resistance arrived is Rmax=20 Ω, then transmission coil is in working frequency f0The corresponding internal resistance of=800KHzFor：
Transmission coil is in working frequency f0Corresponding quality factor when=2MHzFor：
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (11)
1. a kind of method of transmission coil quality factor in test high frequency wireless power transmission systems, which is characterized in that the method packet
It includes：
The self-induction L of transmission coil is tested under low frequency condition；
It is f that feeder loop, which is tested, in transmission coil working frequency0When internal resistance R ', wherein the size of the feeder loop is not more than
Transmission coil, circle number are less than the circle number of transmission coil；
Transmission coil is placed in two identical and coaxial feeder loop middles, tests two feeder loop systems
Scattering parameter, and using the corresponding frequency of the scattering parameter peak value as the self-resonant frequency f of transmission coilS；
According to the self-induction L and self-resonant frequency f of transmission coilSDetermine the parasitic capacitance C of transmission coilS；
One feeder loop and transmission coil are coaxially placed every sky, and in the mutual inductance tested under low frequency condition between two coils
M, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, the equivalent resistance of the feeder loop is tested, and survey is set
The maximum equivalent resistance of examination is Rmax, wherein as the compensating electric capacity C1When being connected in parallel on transmission coil both ends, transmission coil is in height
Resonance frequency under the conditions of frequency is equal to its working frequency f0, the compensating electric capacity C1Value according to the self-induction L of transmission coil, work
Frequency f0With parasitic capacitance CSIt determines；
According to the maximum equivalent resistance R of the feeder loopmaxWith internal resistance R ', the self-induction L and mutual inductance M of transmission coil, which are determined, to be passed
Defeated coil is in working frequency f0When internal resistance R and quality factor
2. the method according to claim 1, wherein the self-induction L and self-resonant frequency f according to transmission coilS
Determine the parasitic capacitance C of transmission coilSFormula be：
3. the method according to claim 1, wherein working as the compensating electric capacity C1Root is connected in parallel on transmission coil both ends
When, resonance frequency of the transmission coil under high frequency condition is equal to its working frequency f0, the compensating electric capacity C1Value according to transmission line
Self-induction L, the working frequency f of circle0With parasitic capacitance CSDetermining formula is：
4. the method according to claim 1, wherein according to the maximum equivalent resistance R of the feeder loopmaxWith
Internal resistance R ', the self-induction L and mutual inductance M of transmission coil determine transmission coil in working frequency f0When internal resistance R and quality factor
Formula be：
5. the device of transmission coil quality factor in a kind of test high frequency wireless power transmission systems, which is characterized in that described device packet
It includes：
Feeder loop is connect with measuring unit, and and transmission coil every empty coaxial placement, wherein the ruler of the feeder loop
Very little to be not more than transmission coil, circle number is less than the circle number of transmission coil；
Measuring unit is used to test the parameter of transmission coil and feeder loop at different frequencies,；
Compensating electric capacity, it is in parallel with the both ends of transmission coil, for being equal to the resonance frequency of transmission coil under high frequency condition
The working frequency f of transmission coil0；
Data processing unit is connect with measuring unit, and the parameter for being transmitted according to measuring unit carries out data processing with true
Determine the quality factor of transmission coil.
6. device according to claim 5, which is characterized in that the measuring unit includes：
First measuring unit is connect with two feeder loops, for by transmission coil be placed in two it is identical and same
When the feeder loop middle of axis, the scattering parameter of two feeder loop systems is tested, and the scattering parameter peak value is corresponding
Self-resonant frequency f of the frequency as transmission coilS；
Second measuring unit, the self-induction L and feeder loop for being used to directly test transmission coil in low frequency condition are in transmission coil
Working frequency f0When internal resistance R ', when coaxially placing a feeder loop and transmission coil every sky, under low frequency condition
The mutual inductance M between two coils is tested, and in the transmission coil both ends Shunt compensation capacitor C1Afterwards, the feed line is tested
The maximum equivalent resistance R of circlemax；
7. device according to claim 6, which is characterized in that the data processing unit includes：
First computing unit is used to determine the parasitism electricity of transmission coil according to the self-induction L and self-resonant frequency fS of transmission coil
Hold CS, wherein calculate parasitic capacitance CSFormula be：
Second computing unit is used for the self-induction L according to transmission coil, working frequency f0With parasitic capacitance CSDetermine transmission coil
Compensating electric capacity C1, wherein calculate compensating electric capacity C1Formula be：
Third computing unit is used for the maximum equivalent resistance R according to the feeder loopmaxWith internal resistance R ', transmission coil from
Sense L and mutual inductance M determines transmission coil in working frequency f0When internal resistance R and quality factorWherein, internal resistance R and product are calculated
Prime factorFormula be：
8. device according to claim 6, which is characterized in that first measuring unit is Network Analyzer, described
Two measuring units are impedance analyzers.
9. according to device any one of in claim 5 to 8, which is characterized in that the compensating electric capacity is that low-loss is humorous
Shake capacitor, including high-frequency film capacitor, ceramic condenser and ceramic disc capacitor.
10. device according to claim 9, which is characterized in that the transmission coil is that snail is rectangular, snail
Round, stereo spiral is rectangular or stereo spiral circular coil, is formed by litz wire, copper pipe or aluminum pipe coiling, and its resonance frequency
Rate is greater than the working frequency of wireless power transmission systems.
11. device according to claim 9, which is characterized in that the feeder loop be coiling 1-2 circle planar square or
Planar rondure coil is formed by litz wire, copper pipe or aluminum pipe coiling, and self-induction is less than the 5% of transmission coil.
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| CN201810784884.2A CN108872753B (en) | 2018-07-17 | 2018-07-17 | Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613333A (en) * | 2018-11-26 | 2019-04-12 | 华中科技大学 | A kind of coil resonance frequency measurement method suitable for radio energy transmission system |
| CN109638980A (en) * | 2018-11-26 | 2019-04-16 | 中国电力科学研究院有限公司 | A kind of method and system that the impedance matching for high frequency wireless power transmission systems is adjusted |
| CN111398724A (en) * | 2020-04-20 | 2020-07-10 | 杭州电子科技大学温州研究院有限公司 | Detection method of implanted integrated coil for wireless power supply |
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| CN111398724B (en) * | 2020-04-20 | 2021-12-21 | 杭州电子科技大学温州研究院有限公司 | Detection method of implanted integrated coil for wireless power supply |
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