CN114649872A - Laminated high-capacitance-bias-rate magnetic coupling mechanism based on anisotropic wound coils and design method - Google Patents
Laminated high-capacitance-bias-rate magnetic coupling mechanism based on anisotropic wound coils and design method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical group [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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Abstract
The invention discloses a laminated high-capacity-bias-rate magnetic coupling mechanism based on heterodromous wound coils and a design method thereof, wherein the coupling mechanism comprises a transmitting end and a receiving end; the transmitting end comprises a transmitting coil, a transmitting end magnetic core and a compensating coil; the transmitting end magnetic core is laid below the transmitting coil and is arranged close to the transmitting coil; the compensating coil is arranged right above the transmitting coil; the receiving end comprises a receiving coil and a receiving end magnetic core; the receiving coil is arranged right above the compensating coil of the transmitting end and is used for coupling with the transmitting coil to realize wireless charging; the receiving end magnetic core is laid above the receiving coil and is arranged close to the receiving coil; the transmitting coil, the compensating coil and the receiving coil are formed by connecting two coils wound in different directions in series. The high-capacity bias rate magnetic coupling mechanism has good anti-bias performance, and the mutual inductance of the coupling mechanism can be kept relatively stable after the coil is biased.
Description
Technical Field
The invention belongs to the field of wireless power transmission, and particularly relates to a laminated high-capacitance-bias-rate magnetic coupling mechanism based on a heterodromous wound coil and a design method.
Background
The wireless power transmission is an energy transmission technology for transmitting energy from a power supply side to electric equipment in a non-direct contact mode, gets rid of the constraint of wires and cables in the traditional charging mode, has better adaptability and safety, and is widely concerned and researched by domestic and foreign scholars as a novel charging mode.
The coupling mechanism is a key part for energy transmission in a wireless electric energy transmission system, high-frequency alternating current is converted into a high-frequency magnetic field through a transmitting coil, the high-frequency magnetic field is converted into same-frequency alternating current through a receiving coil, electric energy is transmitted to a load after being processed, and wireless transmission of energy is achieved.
The existing magnetic coupling mechanism of the wireless power transmission system focuses on improving transmission efficiency and output power, and the magnetic coupling mechanism is easy to deviate, so that the technical problem that the transmission efficiency and the transmission power of the system are unstable is solved.
Disclosure of Invention
The invention aims to: the invention aims to provide a laminated high-capacitance bias-rate magnetic coupling mechanism based on a heterodromous wound coil and a design method thereof.
The invention content is as follows: the invention relates to a laminated high-capacitance-bias-rate magnetic coupling mechanism based on a heterodromous wound coil, which comprises a transmitting end and a receiving end; the transmitting end comprises a transmitting coil, a transmitting end magnetic core and a compensating coil; the transmitting end magnetic core is laid below the transmitting coil and is arranged close to the transmitting coil; the compensating coil is arranged right above the transmitting coil; the receiving end comprises a receiving coil and a receiving end magnetic core; the receiving coil is arranged right above the compensating coil of the transmitting end and is used for coupling with the transmitting coil to realize wireless charging; the receiving end magnetic core is laid above the receiving coil and is arranged close to the receiving coil; the transmitting coil, the compensating coil and the receiving coil are formed by connecting two coils wound in different directions in series.
The central axis of the transmitting coil, the central axis of the compensating coil and the central axis of the receiving coil are coaxially arranged and are in optimal alignment positions, and at the moment, the wireless charging efficiency is highest.
The transmitting coil and the compensating coil are wound by the same wire, so that an exposed wire interface can be avoided, and extra loss at a wiring position is avoided.
And the transmitting end magnetic core and the receiving end magnetic core are both made of rectangular ferrite materials.
The invention also comprises a design method of the laminated high-capacitance-bias-rate magnetic coupling mechanism based on the anisotropic wound coil, which comprises the following steps:
determining the original transmitting coil and receiving coil size, number of turns and transmission height, wherein the radius R of the compensating coil3A, number of turns of compensation coil N 31, transmission height h1＝h；
Secondly, setting a minimum value of a structural parameter of the compensation coil and an initial value of a transmission height;
setting X-axis and Y-axis offset ranges, and dividing the maximum offset distance into N sections;
(IV) setting the minimum and maximum deviation tolerance initial value X in the X-axis deviation direction1And x2Setting the minimum and maximum deviation tolerance initial values x in the Y-axis deviation direction3And x4Setting the original mutual inductance Mtr1Initial ratio of holding amount a;
(V) calculating a mutual inductance value M corresponding to the right end point value between the ith section in the X-axis offset directioni(ii) a Calculating the mutual inductance value M corresponding to the point value of the right end point of the ith section in the Y-axis offset directionj(ii) a Wherein i, j is 1,2, …, N;
(VI) setting a constraint condition, if the mutual inductance value M isiAnd MjIf the constraint condition is met, the radius R of the circle center of the compensation coil is output3N number of turns3Height h of transport1。
In the sixth step, if the mutual inductance value M is satisfiediAnd MjIf the constraint condition is not satisfied, then according to formula R3＝R3+ΔR3Wherein Δ R3Adjusting the compensation coil radius R1 mm3And determining the adjusted compensation coil radius R3Is not greater than a specified transmitting end size.
If the adjusted radius R of the compensation coil3If the value of (D) is not larger than the specified transmitting end size, the procedure goes to the step (five).
If the adjusted radius R of the compensation coil3If the value of (A) is not greater than the specified transmitting end size, then according to the formula R3＝a，h1＝h1+Δh1Wherein Δ h1Adjusting the transport height h to 1mm1And determines the adjusted transmission height h1Whether or not the value of (c) satisfies a set transmission gap.
If the adjusted transmission height h1If the value of (1) is not less than the set transmission gap, increasing the number of turns of the compensation coil; and (4) judging whether the transmitting end meets the requirement of not more than the specified size after the number of turns of the compensating coil is increased, and if not, turning to the step (four).
The set constraint conditions are as follows:
in the formula, x1And x2Respectively setting minimum and maximum deviation tolerance initial values in the X-axis deviation direction; x is the number of3And x4Respectively, the most in the Y-axis offset directionInitial values of small and maximum deviation tolerance; sigmaiAnd σjRespectively setting the offset tolerance of each segmented test point on an X axis and a Y axis; m0Is mutual inductance when the coupling mechanism is in positive time setting; miAnd MjRespectively obtaining mutual inductance values of each segmented test point on the X axis and the Y axis after compensation; wherein i, j is 1,2, …, N.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the beneficial effects that: the compensation coil can offset partial magnetic flux right above the center, so that the magnetic flux density at the center is reduced, and the flux linkage coupling when the coupling mechanism is in the right time is reduced, thereby the flux linkage coupling degree under the offset condition is similar, the mutual inductance before and after the offset is similar, under the ideal condition, the mutual inductance does not change along with the increase of the offset within a certain offset range, and the mutual inductance offset curve keeps horizontal, so the coupling mechanism has higher offset resistance.
Drawings
Fig. 1 is a schematic structural diagram of a laminated high-tolerance magnetic coupling mechanism based on a heterodromous wound coil according to the present invention;
FIG. 2 is a magnetic field distribution comparison diagram of a laminated high-tolerance magnetic coupling mechanism based on a counter-wound coil in two states before and after a supplementary coil is added;
FIG. 3 is a graph showing the offset characteristic of the laminated high-tolerance magnetic coupling mechanism based on the anisotropic wound coil according to the present invention;
FIG. 4 is a waveform diagram of an offset experiment of the laminated high-tolerance magnetic coupling mechanism based on the anisotropic wound coil according to the present invention;
fig. 5 is a flowchart of a design method of a laminated high-tolerance magnetic coupling mechanism based on a heterodromous wound coil.
Detailed Description
The technical scheme of the invention is described in detail in the following with the combination of the detailed description and the attached drawings.
As shown in fig. 1, the laminated high-capacitance bias-ratio magnetic coupling mechanism based on the anisotropic wound coil of the invention comprises a transmitting end and a receiving end, wherein the transmitting end comprises a transmitting coil 1, a transmitting end magnetic core 2 and a compensating coil 3; the receiving end includes a receiving coil 4 and a receiving end magnetic core 5. The transmitting coil 1, the offsetting coil 3 and the receiving coil 4 are formed by connecting two circular coils wound in different directions in series, the two circular coils are positioned on the same horizontal plane, and particularly, the two circular coils in the transmitting coil 1 and the compensating coil 3 are formed by winding a conducting wire. The transmitting end magnetic core 2 is laid below the transmitting coil 1 and is arranged close to the transmitting coil 1, and the transmitting end magnetic core 2 completely covers the area of the transmitting coil 1; the compensating coil 3 is arranged right above the transmitting coil 1; the receiving coil 4 is arranged right above the compensating coil 3 at the transmitting end and is used for coupling with the transmitting coil 1 to realize wireless charging; the receiving end magnetic core 5 is laid above the receiving coil 4 and closely attached to the receiving coil 4, and the receiving end magnetic core completely covers the area of the receiving coil 4. The central axis of the transmitting coil 1, the central axis of the compensating coil 3 and the central axis of the receiving coil 4 are coaxially arranged and are in optimal alignment positions, and the wireless charging efficiency is highest. The transmitting end magnetic core 2 and the receiving end magnetic core 5 are both made of rectangular ferrite materials.
In the conventional wireless charging magnetic coupling mechanism, the magnetic flux density of the transmitting coil is the largest when the transmitting coil is positioned at the center right above the receiving coil, the coupling is also the strongest, the magnetic flux density is reduced along with the deviation of the coil, and the coupling is also gradually reduced. The compensation ring 3 in the scheme can offset partial magnetic flux right above the center, so that the magnetic flux density at the center is reduced, and flux linkage coupling when the coupling mechanism is in positive time alignment is reduced, so that the flux linkage coupling degree under the offset condition is similar, mutual inductance before and after offset is similar, under an ideal condition, the mutual inductance does not change along with the increase of the offset within a certain offset range, and a mutual inductance offset curve is kept horizontal.
As shown in fig. 2, comparing fig. 2(a) and (b), it can be seen that when the compensation coil 3 is not added, the magnetic field strength right above the transmitting coil 1 is higher, and when the compensation coil 3 is added, the magnetic field strength right above is obviously reduced, so that the mutual inductance when the coupling mechanism is in the positive time is also reduced, and the mutual inductance is closer to the mutual inductance of the coupling mechanism after the coil is offset, so that the mutual inductance offset curve is more gentle, and the offset resistance of the invention is proved.
As shown in fig. 3, when the coils are aligned, the mutual inductance of the coupling mechanism is the highest, and when the coils are offset, the mutual inductance is generally gradually reduced, but since the magnetic coupling mechanism provided by the invention has better offset resistance, the offset curve is more stable, and the X-axis offset resistance is better than the Y-axis, the invention has good offset resistance.
As shown in fig. 4, comparing fig. 4(a) and fig. 4(b), it can be seen that, after the compensation coil is added, the waveform of the coupling mechanism changes smoothly in the continuous offset process, and the waveforms are almost consistent before and after the offset, so that it can be proved that the coupling mechanism provided by the present invention has high offset resistance. The specific set parameter values are as follows: the input voltage is 20V, the resonant frequency is uniformly set to be 190kHz, the loads are all set to be 24 omega, the number of turns of the offsetting coil is 7, the radius is 103mm, the number of turns of the transmitting coil is 10, the radius is 205mm, the number of turns of the receiving coil is 20, the radius is 109mm, wherein the graph (a) in fig. 4 is an experimental oscillogram (the X-axis direction continuously shifts 100mm after the Y-axis direction shifts 100mm) in the shifting process without adding the compensating coil, and the transmission distance is 150 mm; fig. 4(b) is an experimental waveform diagram in the offset process after adding the compensation coil (after the Y-axis direction is offset by 100mm, the X-axis direction is offset by 100mm), the distance between the transmitting coil and the receiving coil is 150mm, and the distance between the cancellation coil and the transmitting coil is 45 mm. In FIG. 4, UsPrimary side voltage, UoutOutput voltage, I1Primary side current, I2-an output current.
As shown in fig. 5, the present invention further includes a design method of a laminated high-capacitance-bias-ratio magnetic coupling mechanism based on heterodromous wound coils, including the following steps:
determining the original transmitting coil and receiving coil size, number of turns and transmission height, wherein the radius R of the compensating coil3A, number of turns of compensation coil N 31, transmission height h1＝h；
Secondly, setting a minimum value of a structural parameter of the compensation coil and an initial value of a transmission height;
setting X-axis and Y-axis offset ranges, and dividing the maximum offset distance into N sections;
(IV) setting the minimum and maximum deviation tolerance initial value X in the X-axis deviation direction1And x2Setting the minimum and maximum deviation tolerance initial values x in the Y-axis deviation direction3And x4Setting the original mutual inductance Mtr1Initial ratio of holding amount a;
(V) calculating a mutual inductance value M corresponding to the right end point value between the ith section in the X-axis offset directioni(ii) a Calculating the mutual inductance value M corresponding to the point value of the right end point of the ith section in the Y-axis offset directionj(ii) a Wherein i, j is 1,2, …, N;
(VI) setting a constraint condition, if the mutual inductance value M isiAnd MjIf the constraint condition is met, the radius R of the circle center of the compensation coil is output3N number of turns3Height h of transport1。
Wherein the set constraint conditions are as follows:
in the formula, x1And x2Respectively setting minimum and maximum deviation tolerance initial values in the X-axis deviation direction; x is the number of3And x4Respectively as the minimum and maximum deviation tolerance initial values in the Y-axis deviation direction; sigmaiAnd σjRespectively setting the offset tolerance of each segmented test point on an X axis and a Y axis; m0Is mutual inductance when the coupling mechanism is in positive time setting; miAnd MjRespectively obtaining mutual inductance values of each segmented test point on the X axis and the Y axis after compensation; wherein i, j is 1,2, …, N.
In the sixth step, if the mutual inductance value M is satisfiediAnd MjIf the constraint condition is not satisfied, then according to formula R3＝R3+ΔR3Wherein Δ R3Adjusting the compensation coil radius R1 mm3And determining the adjusted compensation coil radius R3Is not greater than a specified transmitting end size.
If the adjusted radius R of the compensation coil3If the value of (D) is not larger than the specified transmitting end size, turning to the step (five); if the adjusted radius R of the compensation coil3If the value of (b) is not greater than the specified transmitting end size, then according to formula R3＝a，h1＝h1+Δh1Wherein Δ h1Adjusting the transport height h to 1mm1And determines the adjusted transmission height h1Whether or not the value of (c) satisfies a set transmission gap.
If the adjusted transmission height h1If the value of (1) is not less than the set transmission gap, increasing the number of turns of the compensation coil; and (4) judging whether the transmitting end meets the requirement of not more than the specified size after the number of turns of the compensating coil is increased, and if not, turning to the step (four).
Claims (10)
1. A laminated high-capacitance-bias-rate magnetic coupling mechanism based on a heterodromous wound coil comprises a transmitting end and a receiving end; the method is characterized in that: the transmitting end comprises a transmitting coil (1), a transmitting end magnetic core (2) and a compensating coil (3); the transmitting end magnetic core (2) is laid below the transmitting coil (1) and is arranged close to the transmitting coil (1); the compensating coil (3) is arranged right above the transmitting coil (1);
the receiving end comprises a receiving coil (4) and a receiving end magnetic core (5); the receiving coil (4) is arranged right above the compensating coil (3) at the transmitting end and is used for being coupled with the transmitting coil (1) to realize wireless charging; the receiving end magnetic core (5) is laid above the receiving coil (4) and is arranged close to the receiving coil (4); the transmitting coil (1), the compensating coil (3) and the receiving coil (4) are formed by connecting two coils wound in different directions in series.
2. The laminated high-capacitance-bias-ratio magnetic coupling mechanism based on the heterodromous wound coil as claimed in claim 1, wherein: the central axis of the transmitting coil (1), the central axis of the compensating coil (3) and the central axis of the receiving coil (4) are coaxially arranged.
3. The laminated high-capacitance-bias-ratio magnetic coupling mechanism based on the heterodromous wound coil as claimed in claim 1, wherein: the transmitting coil (1) and the compensating coil (3) are wound by the same wire.
4. The laminated high-capacity-bias-ratio magnetic coupling mechanism based on the anisotropic wound coils as claimed in claim 1, wherein: the transmitting end magnetic core (2) and the receiving end magnetic core (5) are both made of rectangular ferrite materials.
5. A design method of a laminated high-capacitance-bias-ratio magnetic coupling mechanism based on heterodromous wound coils as claimed in any one of claims 1 to 4 is characterized by comprising the following steps:
determining the original transmitting coil and receiving coil size, number of turns and transmission height, wherein the radius R of the compensating coil3A, number of turns of compensation coil N31, transmission height h1＝h；
Secondly, setting a minimum value of a structural parameter of the compensation coil and an initial value of a transmission height;
setting X-axis offset range and Y-axis offset range, and dividing the maximum offset distance into N sections;
(IV) setting the minimum and maximum deviation tolerance initial value X in the X-axis deviation direction1And x2Setting the minimum and maximum deviation tolerance initial values x in the Y-axis deviation direction3And x4Setting the original mutual inductance Mtr1Initial ratio of holding amount a;
(V) calculating a mutual inductance value M corresponding to the right end point value between the ith section in the X-axis offset directioni(ii) a Calculating the mutual inductance value M corresponding to the point value of the right end point of the ith section in the Y-axis offset directionj(ii) a Wherein i, j is 1,2, …, N;
(VI) setting a constraint condition, if the mutual inductance value M isiAnd MjIf the constraint condition is met, the radius R of the circle center of the compensation coil is output3N number of turns3Height h of transport1。
6.The design method of the laminated high-capacity-bias-ratio magnetic coupling mechanism based on the anisotropic wound coils as claimed in claim 5, wherein the method comprises the following steps: in the sixth step, if the mutual inductance value M is satisfiediAnd MjIf the constraint condition is not satisfied, then according to formula R3＝R3+ΔR3Wherein Δ R3Adjusting the compensation coil radius R1 mm3And determining the adjusted compensation coil radius R3Is satisfied to be no greater than a specified transmitting end size.
7. The design method of the laminated high-tolerance magnetic coupling mechanism based on the anisotropic wound coil as claimed in claim 6, wherein: if the adjusted radius R of the compensation coil3If the value of (D) is not larger than the specified transmitting end size, the procedure goes to the step (five).
8. The design method of the laminated high-tolerance magnetic coupling mechanism based on the anisotropic wound coil as claimed in claim 6, wherein: if the adjusted radius R of the compensation coil3If the value of (A) is not greater than the specified transmitting end size, then according to the formula R3＝a，h1＝h1+Δh1Wherein Δ h1Adjusting the transport height h to 1mm1And determines the adjusted transmission height h1Whether or not the value of (c) satisfies a set transmission gap.
9. The design method of the laminated high-capacitance-bias-ratio magnetic coupling mechanism based on the anisotropic wound coils as claimed in claim 8, wherein the method comprises the following steps: if the adjusted transmission height h1If the value of (1) is not less than the set transmission gap, increasing the number of turns of the compensation coil; and (5) judging whether the transmitting end meets the requirement of not more than the specified size after the number of turns of the compensation coil is increased, and if not, turning to the step (IV).
10. The method for designing the laminated high-capacitance-bias-ratio magnetic coupling mechanism based on the anisotropic wound coil as claimed in claim 5, wherein the set constraint conditions are as follows:
in the formula, x1And x2Respectively setting minimum and maximum deviation tolerance initial values in the X-axis deviation direction; x is a radical of a fluorine atom3And x4Respectively as the minimum and maximum deviation tolerance initial values in the Y-axis deviation direction; sigmaiAnd σjRespectively setting the offset tolerance of each segmented test point on an X axis and a Y axis; m0Is mutual inductance when the coupling mechanism is in positive time setting; miAnd MjRespectively obtaining mutual inductance values of each segmented test point on the X axis and the Y axis after compensation; wherein i, j is 1,2, …, N.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115257415A (en) * | 2022-07-21 | 2022-11-01 | 广西电网有限责任公司电力科学研究院 | Wireless energy transmitting coil of type 3D + Q and parameter design method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115257415A (en) * | 2022-07-21 | 2022-11-01 | 广西电网有限责任公司电力科学研究院 | Wireless energy transmitting coil of type 3D + Q and parameter design method |
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