CN106961165A - Wireless power transmission circuit, radio energy transmitting terminal and radio energy receiving terminal - Google Patents
Wireless power transmission circuit, radio energy transmitting terminal and radio energy receiving terminal Download PDFInfo
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- CN106961165A CN106961165A CN201710367121.3A CN201710367121A CN106961165A CN 106961165 A CN106961165 A CN 106961165A CN 201710367121 A CN201710367121 A CN 201710367121A CN 106961165 A CN106961165 A CN 106961165A
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Abstract
Disclose a kind of wireless power transmission circuit, radio energy transmitting terminal and radio energy receiving terminal, by the way that the electric capacity in resonance circuit is divided into two, and it is arranged at the two ends of coil in a series arrangement respectively, so that common mode current flows to ground to a part by coil over the ground, simultaneously, common mode current flows to coil to another part by ground over the ground, so as to cancel out each other, suppresses total common mode current over the ground.
Description
Technical field
The present invention relates to Power Electronic Technique, and in particular to wireless charging technology, more particularly, to a kind of radio energy
Transmission circuit, radio energy transmitting terminal and radio energy receiving terminal.
Background technology
Wireless power technology can wirelessly transmit electric energy between electronic devices, thus be widely used in consumption electricity
In sub- product and other types of electronic product.Wireless power technology is generally by launching lateral coil and receiving the mutual of lateral coil
Electromagnetic coupled realizes being wirelessly transferred for electric energy.Wherein, magnetic resonance type wireless power method can be wirelessly at a distance of one
The receiving terminal of set a distance efficiently provides electric energy.In the method, electric energy transmitting terminal and electric energy receiving terminal be equipped with by coil and
The resonance circuit of electric capacity composition, it allows electric field and the magnetic field resonance between two circuits, with wirelessly transmitting electrical energy.
As shown in figure 1, existing radio energy radiating circuit is generally humorous to form LC using coil Ls and electric capacity Cs series connection
Shake circuit, and LC resonance circuits are in the predetermined resonance of work angular frequency 0 so that the impedance of radio energy radiating circuit be zero (
That is,), so as to carry out electric energy transmitting with higher efficiency of transmission.
But, in order to be coupled in power supply based on the bigger position freedom of radio energy receiving terminal or simultaneously multiple wireless
Electric energy receiving terminal is powered, it will usually increase transmitting coil Ls or receiving coil Ld size and inductance value, with improve transmitting and
The coupling of receiving coil.This can cause the increase of coil turn and area, so increase coil to the earth parasitic capacitance Cp=ε
S/D, wherein, ε is dielectric constant, and S is the area of coil, and D is the distance between coil and ground.Meanwhile, as shown in Fig. 2 due to
Leaping voltage on parasitic capacitance C1-Cn presence, coil forms common mode current Icm, I over the ground easily by parasitic capacitanceCM=
Cp dV/dt, cause Conducted Electromagnetic Interference (EMI).
The content of the invention
In view of this, the disclosure provides a kind of wireless power transmission circuit, radio energy transmitting terminal and radio energy and received
End, effectively to suppress common mode current over the ground while coil dimension or the number of turn is increased.
First aspect there is provided a kind of wireless power transmission circuit, including：
Coil；
First electric capacity, is connected in series in the first end of the coil；And
Second electric capacity, is connected in series in the second end of the coil；
Wherein, first electric capacity, the second electric capacity and the coil are in predetermined working frequency resonance.
Further, the capacitance ratio of first electric capacity and second electric capacity is provided so that coil over the ground
Common mode current is minimized.
Further, first electric capacity is equal with the capacitance of second electric capacity.
Further, the capacitance ratio of first electric capacity and the second electric capacity and the coiling form fit of the coil.
Further, the capacitance of first electric capacity and second electric capacity is configured such that the equivalent electric after series connection
Capacitance and the inductance value of the coil are in the working frequency resonance.
Further, the wireless power transmission circuit is radio energy radiating circuit or radio energy receiving circuit.
Second aspect is there is provided a kind of radio energy transmitting terminal, suitable for wirelessly launching electric energy, wherein, it is described wireless
Electric energy transmitting terminal includes wireless power transmission circuit as described above.
The third aspect is there is provided a kind of radio energy receiving terminal, suitable for wirelessly receiving electric energy, wherein, it is described wireless
Electric energy receiving terminal includes wireless power transmission circuit as described above.
By the way that the electric capacity in resonance circuit is divided into two, and it is arranged at the two ends of coil in a series arrangement respectively so that
Voltage almost symmetry distribution on coil, common mode current flows to ground to a part by coil over the ground, meanwhile, another part common mode over the ground
Electric current flows to coil by ground, so as to cancel out each other, suppresses total common mode current over the ground.
Brief description of the drawings
Fig. 1 is the circuit diagram of the radio energy radiating circuit of prior art；
Fig. 2 is the equivalent circuit diagram of the radio energy radiating circuit of prior art；
Fig. 3 is the equivalent circuit diagram of the radio energy radiating circuit of prior art；
Fig. 4 is the circuit diagram of the radio energy radiating circuit of the embodiment of the present disclosure；
Fig. 5 is the equivalent circuit diagram of the radio energy radiating circuit of the embodiment of the present disclosure；
Fig. 6 is the schematic diagram of the radio energy radiating circuit of the embodiment of the present disclosure；
Fig. 7 is the schematic diagram for the radio energy transmission system that the embodiment of the present disclosure is related to.
Embodiment
It is described in detail below in conjunction with accompanying drawing several preferred embodiments of this disclosure, but the disclosure is not restricted to
These embodiments.The disclosure covers any replacement made in the spirit and scope of the disclosure, modification, equivalent method and side
Case.Thoroughly understand in order that the public has to the disclosure, be described in detail in disclosure below preferred embodiment specific thin
Section, and description without these details can also understand the disclosure completely for a person skilled in the art.
The term " comprising " used in the claims is not construed as the limitation to institute's array apparatus thereafter.It is not arranged
Except other elements or step.Therefore, " scope that a kind of device includes device A and B " should be not limited to only including components A for statement
With B device.It means that the associated components of the device are A and B for the disclosure.
In addition, term first, second, third, etc. in the present description and claims are used between similar element
Make a distinction, not necessarily for description order or sequential.It should be appreciated that the term so used is can in appropriate circumstances
With exchange, and embodiment of the disclosure described here can be transported under the order different from being described herein or illustrating
OK.
It should be appreciated that when element is referred to as with another element " connection " or " coupling ", it can be with another element
It is directly connected to or couples, or there may be intermediary element.By contrast, when element be referred to as with another element " directly
When connection ", " directly coupling ", in the absence of intermediary element.Other words for describing the relation between element should be with identical
Mode understood (that is, " ... with ... between " and " ... with ... directly between ", " adjacent " and " direct neighbor " etc.).
Fig. 3 is the equivalent circuit diagram of the radio energy radiating circuit of prior art.As shown in figure 3, in the nothing of prior art
In line electric energy transmitting circuit, because electric capacity Cs and transmitting coil Ls is in frequency f0 resonance, this causes the electric current Is that coil midstream is crossed
During=I1Sin (ω 0), the voltage Vc on electric capacity Cs is met：
Meanwhile, the voltage Vl on coil Ls is met：
That is, Vc and Vl amplitudes same phase is on the contrary, this make it that the total voltage at radio energy radiating circuit two ends is zero.Line
The high-frequency alternating voltage enclosed on Ls by each circle coil or each section of coil can via equivalent parasitic capacitance C0 over the ground,
C1 ..., Cn-1, Cn produce n common mode current Icm0 to Icmn over the ground.Due to the voltage's distribiuting on synchronization, coil Ls
It is not symmetrical.Therefore, total common mode current Icm is met：
Icm=Icm0+Icm1+ ...+Icmn
The common mode current Icm being not zero can cause Conducted Electromagnetic Interference.
Fig. 4 is the circuit diagram of the radio energy radiating circuit of the embodiment of the present disclosure.As shown in figure 4, the present embodiment is wireless
Electric energy transmitting circuit 1 includes coil Ls, the first electric capacity Cs1 and the second electric capacity Cs2.Wherein, the first electric capacity Cs1 is connected in series online
Ls first end is enclosed, the second electric capacity Cs is connected in series in coil Ls the second end.First electric capacity Cs1, the second electric capacity Cs2 and coil
Ls collectively forms a CLC resonance circuit, in predetermined working frequency f0 resonance.That is, the first electric capacity Cs1, the second electric capacity Cs2
Met with coil Ls：
Wherein, ω 0 is the corresponding angular frequencies of working frequency f0.Thus, radio energy radiating circuit 1 hinders in working frequency f0
It is zero to resist, so as to higher efficiency emission electric energy.
Fig. 5 is the equivalent circuit diagram of the radio energy radiating circuit of the embodiment of the present disclosure.As shown in figure 5, in the present embodiment
In, illustrated so that the first electric capacity Cs1 and the second electric capacity Cs2 capacitance are equal as an example.In Figure 5, coil Ls equivalent electric
Road is on its Central Symmetry.Because the impedance of radio energy radiating circuit 1 is zero, then the voltage at circuit two ends is zero.Therefore, exist
Voltage's distribiuting on coil Ls is also full symmetric.That is, the voltage at 0 point and the voltage symmetry at n points, Vn=-V0,
Vn-1=-V1 ... ..., by that analogy.Thus, the common mode current over the ground at 0 point is met：
Meanwhile, the common mode current over the ground at corresponding n points is met：
When C0 is equal with Cn, Icm0=-Icmn.
Thus, it is possible to which so that one closed-loop path of electric current Icm0 and Icmn formation, will not form common mode current and flow into the earth.
Similarly, electric current Icm1 is identical with Icmn-1 amplitudes, in the opposite direction, and oneself forms a closed-loop path, will not form common mode current
Flow into the earth.As a result, a part over the ground common mode current by coil flow to ground, meanwhile, another part over the ground common mode current by
Ground flows to coil, and overall common mode current is met：
Icm=Icm0+Icm1+ ...+Icmn=0
Thus, multiple closed-loop paths are formed so that reduce the common mode current for flowing into ground, so as to reach suppression common mode electricity over the ground
The purpose of stream.
Fig. 6 is the schematic diagram of the radio energy radiating circuit of the embodiment of the present disclosure.As shown in fig. 6, in practical application scene
Under, it will usually snail line mode is used to form the coil to cause coil flattening as far as possible.First electric capacity Cs1 and
Second electric capacity Cs2 is arranged in series in two exits formation resonance circuit of coil respectively.Coil Ls flattening can cause
Wireless power transmission circuit goes for various portable electric appts.As shown in fig. 6, due to coil coiling from outside to inside,
So that each section of coil is not centrosymmetric.Therefore, the overall distribution of coil and asymmetric, and then cause diverse location
Parasitic capacitance distribution is not full symmetric yet.At this point it is possible to the first electric capacity Cs1 and the second electric capacity Cs2 capacitance are configured,
Pass through adjustment both ratio so that distribution of the voltage's distribiuting as much as possible with parasitic capacitance on coil Ls match (that is,
Match with the shape of coil), different sections of common mode current over the ground is adjusted to minimize common mode current over the ground.
Certainly, if coil is symmetric form, then cause the first electric capacity Cs1's and the second electric capacity Cs2 by setting
Capacitance is equal, can cause that common mode current is zero over the ground in theory.
Thus, the present embodiment by the electric capacity in resonance circuit by being divided into two, and is arranged at line in a series arrangement respectively
The two ends of circle so that common mode current flows to ground to a part by coil over the ground, meanwhile, common mode current is flowed to another part by ground over the ground
Coil, so as to cancel out each other, suppresses total common mode current over the ground.
Further, the circuit structure of the radio energy radiating circuit 1 shown in Fig. 4 is readily adaptable for use in radio energy reception
Circuit 2, suppresses radio energy while the receiving area of radio energy receiving circuit is increased based on identical principle and receives electricity
Common mode current over the ground in road.
Fig. 7 is the schematic diagram for the radio energy transmission system that the embodiment of the present disclosure is related to.As shown in fig. 7, the system bag
Include radio energy transmitting terminal A and radio energy receiving terminal B.Wherein, radio energy transmitting terminal A includes radio energy radiating circuit 1.
Radio energy receiving terminal B includes radio energy receiving circuit 2.Specifically, radio energy receiving circuit 2 include the first electric capacity Cd1,
Second electric capacity Cd2 and coil Ld.Similar with Fig. 4, the first electric capacity Cd1 and the second electric capacity Cd2 are connected in series in coil Ld's respectively
Two ends are to form the circuit structure of almost symmetry, so that radio energy receiving circuit 2 is in frequency f0 resonance, on coil Ld
The distribution of voltage almost symmetry, the parasitic capacitance formation current loop of diverse location, the common mode current for flowing through parasitic capacitance is mutual
Offset so that total common mode current over the ground is minimized.In the figure 7, the He of radio energy radiating circuit 1 of radio energy transmission system
Radio energy receiving circuit 2 uses the circuit structure of the embodiment of the present disclosure.It should be understood that under other application scenarios, also may be used
So that only radio energy radiating circuit 1 is using the circuit structure of the embodiment of the present disclosure or only radio energy receiving circuit 2 is used
The circuit structure of the embodiment of the present disclosure.Radio energy transmitting terminal A can also include inverter circuit 3 and control circuit 4.Inverter circuit
3 high-frequency alternating current for the direct current of input to be converted to working frequency, control circuit 4 is used to control the inverter circuit 3.
Radio energy receiving terminal B can also include rectification circuit 5 and control circuit 6.Rectification circuit 5 is used for radio energy receiving circuit
The high-frequency alternating current of reception is converted to direct current electricity output.Control circuit 6 is used to control the rectification circuit.
Above description is the description of the embodiment of the present disclosure.Without departing from the scope of the disclosure, it is possible to achieve each
Plant alterations and modifications.The disclosure is in order at illustrative purpose proposition, and is not necessarily to be construed as all embodiments of the disclosure
Exclusiveness description, or make the scope of the present disclosure be confined to combine the illustrated and described particular element of these embodiments.
In the case of not limiting, can with substantially similar function is provided or otherwise provide fully operational replacement element come
Instead of any one or more individual components of described invention.This includes the replacement element being currently known, such as this area
Technical staff currently may it is known those, and may future exploitation replacement element, such as those skilled in the art
Member may recognize those for replacement in exploitation.
Claims (8)
1. a kind of wireless power transmission circuit, including：
Coil；
First electric capacity, is connected in series in the first end of the coil；And
Second electric capacity, is connected in series in the second end of the coil；
Wherein, first electric capacity, the second electric capacity and the coil are in predetermined working frequency resonance.
2. wireless power transmission circuit according to claim 1, wherein, the electricity of first electric capacity and second electric capacity
Capacitance ratio is provided so that the common mode current over the ground of coil is minimized.
3. wireless power transmission circuit according to claim 2, wherein, the electricity of first electric capacity and second electric capacity
Capacitance is equal.
4. wireless power transmission circuit according to claim 2, wherein, the capacitance of first electric capacity and the second electric capacity
Ratio and the coiling form fit of the coil.
5. wireless power transmission circuit according to claim 2, wherein, the electricity of first electric capacity and second electric capacity
Capacitance is configured such that the equivalent capacitance value after series connection with the inductance value of the coil in the working frequency resonance.
6. wireless power transmission circuit according to claim 1, wherein, the wireless power transmission circuit is radio energy
Radiating circuit or radio energy receiving circuit.
7. a kind of radio energy transmitting terminal, suitable for wirelessly launching electric energy, wherein, the radio energy transmitting terminal is included such as
Wireless power transmission circuit any one of claim 1-5.
8. a kind of radio energy receiving terminal, suitable for wirelessly receiving electric energy, wherein, the radio energy receiving terminal is included such as
Wireless power transmission circuit any one of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710367121.3A CN106961165B (en) | 2017-05-23 | 2017-05-23 | Wireless power transmission circuit, wireless power transmitting terminal and wireless power receiving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710367121.3A CN106961165B (en) | 2017-05-23 | 2017-05-23 | Wireless power transmission circuit, wireless power transmitting terminal and wireless power receiving terminal |
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| CN106961165A true CN106961165A (en) | 2017-07-18 |
| CN106961165B CN106961165B (en) | 2020-02-07 |
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Cited By (5)
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| CN108616170A (en) * | 2018-07-17 | 2018-10-02 | 宁波微鹅电子科技有限公司 | Electric energy transmitting circuit, circuit module and apply its wireless charging device |
| CN111064287A (en) * | 2019-10-17 | 2020-04-24 | 国网宁夏电力有限公司电力科学研究院 | Binary channels NFC receives and charging device |
| US10650964B2 (en) | 2017-12-25 | 2020-05-12 | Ningbo Weie Electronics Technology Ltd. | Coil module, wireless power transmitting circuit and wireless power receiving circuit |
| US10714979B2 (en) | 2017-06-09 | 2020-07-14 | Ningbo Weie Electronics Technology Ltd. | Wireless power receiving terminal and wireless charging system |
| US11705758B2 (en) | 2020-10-13 | 2023-07-18 | Ningbo Weie Electronics Technology Ltd. | Wireless power transmitting terminal and control method |
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| US10714979B2 (en) | 2017-06-09 | 2020-07-14 | Ningbo Weie Electronics Technology Ltd. | Wireless power receiving terminal and wireless charging system |
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| CN106961165B (en) | 2020-02-07 |
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