CN113972756A - Compensation circuit structure suitable for wireless charging coil of big skew - Google Patents

Compensation circuit structure suitable for wireless charging coil of big skew Download PDF

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CN113972756A
CN113972756A CN202111374724.9A CN202111374724A CN113972756A CN 113972756 A CN113972756 A CN 113972756A CN 202111374724 A CN202111374724 A CN 202111374724A CN 113972756 A CN113972756 A CN 113972756A
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coil
primary
auxiliary
primary coil
groups
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钟文兴
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Ningbo Daochong Technology Co ltd
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Ningbo Daochong Technology Co ltd
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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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • 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
    • 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
    • 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
    • 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

Abstract

The invention belongs to the technical field of wireless charging, and particularly relates to a compensation circuit structure of a wireless charging coil. A compensation circuit structure for a large offset wireless charging coil, comprising: a power input terminal; a primary side circuit having a primary side coil; a secondary circuit having a secondary coil; the primary circuit includes at least two sets of primary coil group, and every set of primary coil group all includes: the primary coil is connected with the compensation element in series to form a resonant circuit; an auxiliary coil connected in parallel with the auxiliary compensation element to form an auxiliary resonant circuit; the resonance circuit and the auxiliary resonance circuit are connected in series and then connected to the input end of the power supply, and the primary coil and the auxiliary coil are in magnetic field coupling with the secondary coil. The invention can realize a large-range wireless charging scene by expanding a plurality of groups of primary coil groups, can realize the automatic switching of adjacent primary coil groups under the condition of large offset of the secondary coil in the wireless charging process, and greatly improves the power transmission efficiency under the large offset range.

Description

Compensation circuit structure suitable for wireless charging coil of big skew
Technical Field
The invention belongs to the technical field of wireless charging, and particularly relates to a compensation circuit structure of a wireless charging coil.
Background
The wireless charging technology is derived from a wireless power transmission technology and can be divided into a low-power wireless charging mode and a high-power wireless charging mode. Electromagnetic induction type is often adopted for low-power wireless charging, resonance type is often adopted for high-power wireless charging, and resonance type is adopted for most electric automobile charging, and energy is generally transmitted to a power utilization device by power supply equipment. Because the power supply equipment and the electric device transmit energy by magnetic fields and are not connected by electric wires, the power supply equipment and the electric device can be exposed without conductive contacts.
The wireless charging technology comprises various modes, wherein the electromagnetic induction mode comprises a primary coil and a secondary coil, the primary coil has alternating current with certain frequency, and certain current is generated in the secondary coil through electromagnetic induction, so that energy is transferred from a transmission end to a receiving end. The most common charging solutions at present use electromagnetic induction. In the conventional wireless charging circuit, in order to expand a wireless charging range, two or more primary coils are arranged on a primary circuit part, and when a secondary coil moves from one primary coil to another primary coil, the power transmission efficiency is particularly low in the large-offset scene. In the process of deviation, the current of the original working primary coil is very large, and the whole wireless charging circuit is easily damaged.
Disclosure of Invention
The invention aims to solve the technical problems that when a secondary coil moves from one primary coil to another primary coil in an electromagnetic induction type wireless charging circuit, the power transmission efficiency is low and the circuit is easy to damage, and provides a compensation circuit structure suitable for a large-offset wireless charging coil.
A compensation circuit structure for a large offset wireless charging coil, comprising: a power input terminal; a primary side circuit having a primary side coil; a secondary circuit having a secondary coil;
the primary circuit comprises at least two groups of primary coil groups, and each group of primary coil groups comprises:
the primary coil is connected with the compensation element in series to form a resonant circuit;
an auxiliary coil connected in parallel with the auxiliary compensation element to form an auxiliary resonant circuit;
the resonance circuit and the auxiliary resonance circuit are connected in series and then are connected to the input end of the power supply, and the primary coil and the auxiliary coil are in magnetic field coupling with the secondary coil.
The compensation element is a compensation capacitor, and the auxiliary compensation element is an auxiliary compensation capacitor.
The auxiliary coil resonates with the auxiliary compensation element at a switching frequency, i.e.:
Figure BDA0003363448120000021
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, La1For self-inductance of said auxiliary coil, Ca1Is the capacitance value of the auxiliary compensation element.
The primary coil resonates with the compensation element and the auxiliary compensation element at a switching frequency, that is:
Figure BDA0003363448120000022
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, L1Is the self-inductance of the primary coil, C1Is the capacitance value of the compensation element, Ca1Is the capacitance value of the auxiliary compensation element.
And magnetic field coupling exists between the primary coils and the auxiliary coils in the two adjacent primary coil groups.
When two adjacent primary coil groups are on the same layer of structure, the auxiliary coils are located on the inner sides of the corresponding primary coils, and the primary coils in the two adjacent groups have a preset distance.
When two adjacent primary coil groups are on different layer structures, the auxiliary coil is positioned above or below the corresponding primary coil, and one primary coil group is positioned above or below the other primary coil group.
When the primary coil groups of the same group are positioned on the same layer structure, and two adjacent primary coil groups are positioned on different layer structures, the auxiliary coils are positioned at the inner sides of the corresponding primary coils, and one primary coil group is positioned above or below the other primary coil group.
When the primary coil groups of the same group are positioned on different layer structures and two adjacent primary coil groups are positioned on the same layer structure, the auxiliary coils are positioned above or below the corresponding primary coils, and the primary coils in the two adjacent groups have preset distances.
Decoupling exists between the primary coils and the auxiliary coils in the two adjacent primary coil groups.
The primary coil and the auxiliary coil in the same group are overlapped through partial coils to realize decoupling.
And the primary coils in two adjacent groups are decoupled by overlapping partial coils.
The auxiliary coils in two adjacent groups have a preset distance.
The positive progress effects of the invention are as follows: the invention adopts a compensation circuit structure suitable for a large-offset wireless charging coil, can realize a large-range wireless charging scene by expanding a plurality of groups of primary side coil groups so as to cover a larger wireless charging range, can realize automatic switching of adjacent primary side coil groups under the condition of large offset of a secondary side coil in the wireless charging process, and greatly improves the power transmission efficiency under the large offset range.
Drawings
FIG. 1 is a schematic diagram of a circuit structure according to the present invention;
FIG. 2 is a coil structure of the present invention;
fig. 3 is another coil structure of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.
Referring to fig. 1, a compensation circuit structure of a wireless charging coil suitable for a large offset includes: a power input, a primary circuit 100 and a secondary circuit 200.
A power input (not shown) is connected to the primary circuit 100 to supply power to the primary circuit 100, and the power input is preferably a high frequency power supply.
The secondary circuit 200 has a secondary winding W3, and the self-inductance of the secondary winding W3 is L3The secondary circuit 200 may be coupled to a powered device (not shown) via a compensation circuit.
The primary circuit 100 includes at least two sets of primary winding sets, each set of primary winding set includes a primary winding and an auxiliary winding, and the primary winding and the auxiliary winding are magnetically coupled to the auxiliary winding. The primary coil and the compensation element are connected in series to form a resonant circuit; the auxiliary coil and the auxiliary compensation element are connected in parallel to form an auxiliary resonant circuit; the resonant circuit and the auxiliary resonant circuit are connected in series and then connected to the input end of the power supply. The compensation element is a compensation capacitor, and the auxiliary compensation element is an auxiliary compensation capacitor.
Referring to fig. 1, the primary circuit 100 includes two adjacent sets of primary winding sets, one set of primary winding set includes a primary winding W1, an auxiliary winding Wa1, a compensation capacitor, and an auxiliary compensation capacitor, and the self-inductance of the primary winding W1 is L1The self-inductance of the auxiliary coil Wa1 is La1The capacitance value of the compensation capacitor is C1The capacitance value of the auxiliary compensation capacitor is Ca1. The other primary coil group comprises a primary coil W2, an auxiliary coil Wa2, a compensation capacitor and an auxiliary compensation capacitor, and the self-inductance of the primary coil W2 is L2The self-inductance of the auxiliary coil Wa2 is La2The capacitance value of the compensation capacitor is C2The capacitance value of the auxiliary compensation capacitor is Ca2. Then:
the auxiliary coil Wa1 resonates with the auxiliary compensation element at the switching frequency, i.e.:
Figure BDA0003363448120000031
where ω is the working angular frequency, ω is 2 π f, and f isOperating frequency, La1To assist self-inductance of coil Wa1, Ca1To assist in compensating the capacitance of the element.
The primary winding W1 resonates with the compensation element and the auxiliary compensation element at the switching frequency, i.e.:
Figure BDA0003363448120000041
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, L1Is self-inductance of the primary winding W1, C1The capacitance value, C, of the compensating element corresponding to the primary winding W1a1The capacitance value of the auxiliary compensation element corresponding to the auxiliary coil Wa 1.
The auxiliary coil Wa2 resonates with the auxiliary compensation element at the switching frequency, i.e.:
Figure BDA0003363448120000042
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, La2To assist self-inductance of coil Wa2, Ca2To assist in compensating the capacitance of the element.
The primary winding W2 resonates with the compensation element and the auxiliary compensation element at the switching frequency, i.e.:
Figure BDA0003363448120000043
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, L2Is self-inductance of the primary winding W2, C2The capacitance value, C, of the compensating element corresponding to the primary winding W2a2The capacitance value of the auxiliary compensation element corresponding to the auxiliary coil Wa 2.
Magnetic field coupling can exist among the primary coil W1, the auxiliary coil Wa1, the primary coil W2 and the auxiliary coil Wa2 in the two adjacent groups of primary coil groups. That is, the mutual inductances between the primary coil W1, the auxiliary coil Wa1, the primary coil W2, and the auxiliary coil Wa2 are all not zero, and there is no overlapping between their coils.
When two adjacent primary coil groups are on the same layer of structure, the auxiliary coil Wa1 is located inside the primary coil W1, the auxiliary coil Wa2 is located inside the primary coil W2, and a preset distance is provided between the primary coil W1 and the primary coil W2, that is, no overlapping condition exists between the coils of the primary coil W1 and the primary coil W2.
When two adjacent primary coil groups are on different layer structures, the auxiliary coil Wa1 is located above or below the primary coil W1, the auxiliary coil Wa2 is located above or below the primary coil W2, and the primary coil W1 is located above or below the primary coil W2.
When the primary coil groups of the same group are on the same layer structure, and two adjacent primary coil groups are on different layer structures, the auxiliary coil Wa1 is located inside the primary coil W1, the auxiliary coil Wa2 is located inside the primary coil W2, and the primary coil W1 is located above or below the primary coil W2. The coil structure shown in fig. 2 employs the above-described structure.
When the primary coil groups of the same group are on different layer structures, and two adjacent primary coil groups are on the same layer structure, the auxiliary coil Wa1 is located above or below the primary coil W1, the auxiliary coil Wa2 is located above or below the primary coil W2, and a preset distance is provided between the primary coil W1 and the primary coil W2, that is, no overlapping condition exists between the primary coil W1 and the primary coil W2.
Decoupling can also exist between the primary coils and the auxiliary coils in the two adjacent groups of primary coil groups, and magnetic field coupling does not exist between the two primary coils and the two auxiliary coils, namely the mutual inductance among the primary coil W1, the auxiliary coil Wa1, the primary coil W2 and the auxiliary coil Wa2 is zero.
Referring to fig. 3, the primary coil and the auxiliary coil in the same group are decoupled by partial coil overlap. And the primary coils in two adjacent groups are decoupled by overlapping partial coils. The auxiliary coils in two adjacent groups have a predetermined distance to achieve negligible mutual inductance between them.
The first embodiment is as follows:
referring to fig. 1 and 3, on the primary sideIn two adjacent primary coil groups of the circuit 100, a primary coil W1 and a primary coil W2 in the two adjacent primary coil groups are designed as main power transmitting coils, and an auxiliary coil Wa1 and an auxiliary coil Wa2 have the effect that when the offset of the auxiliary coil W3 relative to the primary coil W1 or the primary coil W2 is increased, gradually increased impedance is generated in the primary coil W1 or the primary coil W2, so that the current and the loss when the primary coil W1 or the primary coil W2 is used as a main transmitting coil are reduced. The primary coil W1, the auxiliary coil Wa1, the primary coil W2 and the auxiliary coil Wa2 are respectively in magnetic field coupling with the secondary coil W3, and M is13、Ma1、M23And Ma2Are all mutual inductance values. Primary winding W1 and auxiliary winding Wa1 are decoupled from each other, primary winding W2 and auxiliary winding Wa2 are decoupled from each other, and primary winding W1 and primary winding W2 are decoupled from each other. Since the auxiliary coil Wa1 is spaced far from the auxiliary coil Wa2, and has a small area, the coupling between the two is also negligible in the analysis.
The primary winding W1 and the auxiliary winding Wa1 are used as an example:
the impedance reflected by the secondary winding W3 to the primary winding W1 is:
Figure BDA0003363448120000051
the impedance reflected by the secondary winding W3 to the auxiliary winding Wa1 is:
Figure BDA0003363448120000052
the total impedance looking into the primary input is:
Figure BDA0003363448120000053
when the secondary winding W3 moves from one end of the primary winding W1 to one end of the primary winding W2, M13Approaching zero, ZRa1The amplitude of (a) approaches infinity, so ZinThe first term approaches infinity, and the second termThe term approaches zero, and the current on the primary coil W1 approaches zero when the primary coil is used as a main transmitting coil, so that automatic switching of the main transmitting coil is realized, and the power transmission efficiency under a large offset range can be improved.
When the secondary winding W3 moves from one end of the primary winding W2 to one end of the primary winding W1 again, the current on the primary winding W2 is obtained to approach zero by the same principle, so that automatic switching is realized, and finally, the automatic switching function between two adjacent primary winding groups is realized.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A compensation circuit structure for a large offset wireless charging coil, comprising: a power input terminal; a primary side circuit having a primary side coil; a secondary circuit having a secondary coil;
the primary circuit is characterized by comprising at least two groups of primary coil groups, and each group of primary coil groups comprises:
the primary coil is connected with the compensation element in series to form a resonant circuit;
an auxiliary coil connected in parallel with the auxiliary compensation element to form an auxiliary resonant circuit;
the resonance circuit and the auxiliary resonance circuit are connected in series and then are connected to the input end of the power supply, and the primary coil and the auxiliary coil are in magnetic field coupling with the secondary coil.
2. The compensation circuit structure of claim 1, wherein the compensation element is a compensation capacitor and the auxiliary compensation element is an auxiliary compensation capacitor.
3. The compensation circuit structure of a wireless charging coil for a large offset according to claim 2, wherein the auxiliary coil resonates with the auxiliary compensation element at a switching frequency that:
Figure FDA0003363448110000011
wherein pi is the working angle frequency, pi-2 pi f, f is the working frequency, La1For self-inductance of said auxiliary coil, Ca1Is the capacitance value of the auxiliary compensation element.
4. The compensation circuit structure of claim 1, wherein the primary coil resonates with the compensation element and the auxiliary compensation element at a switching frequency, that is:
Figure FDA0003363448110000012
where ω is the operating angular frequency, ω is 2 pi f, f is the operating frequency, L1Is the self-inductance of the primary coil, C1Is the capacitance value of the compensation element, Ca1Is the capacitance value of the auxiliary compensation element.
5. The compensation circuit structure of a wireless charging coil for large offset as claimed in any of claims 1 to 4, wherein there is magnetic field coupling between the primary coil and the auxiliary coil in two adjacent sets of the primary coil sets.
6. The compensation circuit structure of claim 5, wherein when two adjacent sets of the primary windings are on the same layer structure, the auxiliary winding is located inside the corresponding primary winding, and the primary windings in the two adjacent sets have a predetermined distance;
when two adjacent primary coil groups are on different layer structures, the auxiliary coil is positioned above or below the corresponding primary coil, and one primary coil group is positioned above or below the other primary coil group;
when the primary coil groups of the same group are positioned on the same layer structure, and two adjacent primary coil groups are positioned on different layer structures, the auxiliary coils are positioned at the inner sides of the corresponding primary coils, and one primary coil group is positioned above or below the other primary coil group;
when the primary coil groups of the same group are positioned on different layer structures and two adjacent primary coil groups are positioned on the same layer structure, the auxiliary coils are positioned above or below the corresponding primary coils, and the primary coils in the two adjacent groups have preset distances.
7. The compensation circuit structure of any one of claims 1 to 4, wherein there is decoupling between the primary winding and the auxiliary winding in two adjacent sets of the primary winding.
8. The compensation circuit structure of claim 7, wherein the primary coil and the auxiliary coil in the same group are decoupled by partial coil overlap.
9. The compensation circuit structure of claim 7, wherein the primary coils in two adjacent groups are decoupled by partial coil overlap.
10. The compensation circuit structure of a wireless charging coil for a large offset according to claim 7, wherein the auxiliary coils in adjacent two groups have a preset distance.
CN202111374724.9A 2021-11-19 2021-11-19 Compensation circuit structure suitable for wireless charging coil of big skew Pending CN113972756A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108471173A (en) * 2018-04-23 2018-08-31 哈尔滨工业大学 Have both the wireless energy transfer system of constant pressure and constant current output
CN110299767A (en) * 2019-04-25 2019-10-01 西南交通大学 A kind of constant voltage output radio energy transmission system with three-dimensional anti-offset
CN210074889U (en) * 2019-07-10 2020-02-14 南京航空航天大学 Wireless power transmission system with high anti-offset characteristic
CN110808641A (en) * 2019-11-01 2020-02-18 南京航空航天大学 Wireless power transmission topology with strong anti-migration performance based on multi-frequency energy parallel transmission
CN112688441A (en) * 2020-12-15 2021-04-20 中南大学 Wireless power transmission system based on frequency-selecting compensation network anti-position deviation
US20210184496A1 (en) * 2017-12-01 2021-06-17 Auckland Uniservices Limited Misalignment Tolerant Hybrid Wireless Power Transfer System
CN113270948A (en) * 2021-05-26 2021-08-17 重庆大学 Dynamic wireless charging system for inhibiting power fluctuation and parameter design method thereof
CN113659735A (en) * 2021-08-19 2021-11-16 杭州电力设备制造有限公司 Dual-SS hybrid compensation topology and parameter design method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210184496A1 (en) * 2017-12-01 2021-06-17 Auckland Uniservices Limited Misalignment Tolerant Hybrid Wireless Power Transfer System
CN108471173A (en) * 2018-04-23 2018-08-31 哈尔滨工业大学 Have both the wireless energy transfer system of constant pressure and constant current output
CN110299767A (en) * 2019-04-25 2019-10-01 西南交通大学 A kind of constant voltage output radio energy transmission system with three-dimensional anti-offset
CN210074889U (en) * 2019-07-10 2020-02-14 南京航空航天大学 Wireless power transmission system with high anti-offset characteristic
CN110808641A (en) * 2019-11-01 2020-02-18 南京航空航天大学 Wireless power transmission topology with strong anti-migration performance based on multi-frequency energy parallel transmission
CN112688441A (en) * 2020-12-15 2021-04-20 中南大学 Wireless power transmission system based on frequency-selecting compensation network anti-position deviation
CN113270948A (en) * 2021-05-26 2021-08-17 重庆大学 Dynamic wireless charging system for inhibiting power fluctuation and parameter design method thereof
CN113659735A (en) * 2021-08-19 2021-11-16 杭州电力设备制造有限公司 Dual-SS hybrid compensation topology and parameter design method thereof

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