阅读说明：本技术 三角定位法中激励发射端线圈的电路拓扑结构及控制方法 (Circuit topology structure of excitation transmitting end coil in triangulation location method and control method ) 是由 张瑞宏 于 2020-12-07 设计创作，主要内容包括：本发明提出了一种三角定位法中激励发射端线圈的电路拓扑结构及控制方法。电路结构包括：并联连接的支路T、支路T-1和支路T-2,所述支路T包括串联的开关S-T与谐振电容C-T,所述支路T-1包括串联的开关S-1与谐振电容C-(T1),所述支路T-2包括串联的开关S-2与谐振电容C-(T2)；直流电源,与开关S-U、电阻R-T、电感L-T以及并联的所述支路T、支路T-1或支路T-2串联连接；开关S-D与所述直流电源和开关S-U并联,并且与所述电阻R-T、电感L-T串联后与所述支路T、支路T-1或支路T-2并联连接。本发明通过设置开关S-U、S-D的开关频率和导通时间,进而调整电路拓扑结构的谐振频率,可以分别在适合接收端三个线圈的三种谐振频率下工作。(The invention provides a circuit topology structure of an excitation transmitting end coil in a triangulation location method and a control method. The circuit structure includes: parallel-connected branch T and branch T 1 And branch T 2 Said branch T comprising a switch S connected in series T And a resonance capacitor C T Said branch T 1 Comprising a series-connected switch S 1 And a resonance capacitor C T1 Said branch T 2 Comprising a series-connected switch S 2 And a resonance capacitor C T2 (ii) a DC power supply, and switch S U Resistance R T Inductor L T And the branch T connected in parallel 1 Or branch T 2 Are connected in series; switch S D And the DC power supply and the switch S U In parallel with the resistor R T Inductor L T After being connected in series with the branch circuit T and the branch circuit T 1 Or branch T 2 Are connected in parallel. The invention sets a switch S U 、S D The switching frequency and the conduction time of the three coils are adjusted, and then the resonant frequency of the circuit topology structure is adjusted, so that the three coils can work under three resonant frequencies suitable for the three coils of the receiving end respectively.)

1. A circuit topology structure for exciting a transmitting end coil in a triangulation method is characterized by comprising:

branch T, branch T₁And branch T₂Said branch T packetComprising switches S in series_TAnd a resonance capacitor C_TSaid branch T₁Comprising a series-connected switch S₁And a resonance capacitor C_T1Said branch T₂Comprising a series-connected switch S₂And a resonance capacitor C_T2；

DC power supply, and switch S_UResistance R_TInductor L_TAnd said branch T, branch T1 or branch T2 are connected in series;

switch S_DAnd the DC power supply and the switch S_UIn parallel with the resistor R_TInductor L_TAfter being connected in series with the branch circuit T and the branch circuit T₁Or branch T₂Are connected in parallel.

2. The circuit topology for exciting the transmitter coil in triangulation of claim 1, further comprising a receiver coil branch comprising a series connection of capacitors C_RResistance R_RAnd an inductance L_R。

3. The circuit topology of exciting a transmitter coil in triangulation according to claim 1, further comprising a receiver first auxiliary coil branch comprising a series connection of capacitors C_R1Resistance R₁And an inductance L₁。

4. The circuit topology of exciting a transmitter coil in triangulation according to claim 1, further comprising a receiver secondary coil branch comprising a series connected capacitor C_R2Resistance R₂And an inductance L₂。

5. A control method for a circuit topology for exciting a transmitting side coil in the triangulation method according to any of claims 1 to 4, comprising:

control switch S₁、S₂And S_TSetting a switch S_U、S_DWorking in a complementary mannerSwitching frequency and conduction time, so that the circuit topology structure works at f_R、f₁、f₂Under three working frequencies;

measuring the current i of the transmitting end coil branch under three resonant frequencies_TRespectively calculating the coupling distances between the transmitting coil and the receiving coil, between the transmitting coil and the first auxiliary coil and between the transmitting coil and the second auxiliary coil;

and judging whether the transmitting coil is in the induction area of the receiving coil, the first auxiliary coil and/or the second auxiliary coil according to the coupling distance.

6. The method of claim 5, wherein the switch S is used to measure the relative position between the transmitter coil and the receiver coil₁、S₂Normally open, switch S_TNormally closed, switch S_U、S_DComplementary operation at an operating frequency f_R。

7. The method of claim 5, wherein the switch S is used to measure the relative position between the transmitter coil and the first auxiliary coil_T、S₂Normally open, switch S₁Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₁。

8. The method of claim 5, wherein the switch S is used to measure the relative position between the transmitter coil and the second auxiliary coil_T、S₁Normally open, switch S₂Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₂。

9. The method for controlling the circuit topology of the excitation transmitting end coil in the triangulation method according to claim 5, wherein the three resonant frequencies are:

10. the method of claim 5, further comprising determining the area of the transmitter coil, and moving the receiver coil to allow the transmitter coil to reach the target area.

Technical Field

The invention belongs to the field of wireless charging of electric automobiles, relates to a wireless charging triangulation method technology, and more particularly relates to a circuit topology structure and a control method for exciting a transmitting end coil to detect a distance in the wireless charging triangulation method of an electric automobile.

Background

In order to save energy and reduce environmental pollution, electric automobiles are widely popularized in various countries in the world. Due to the limitation of battery capacity, charging infrastructure and other conditions, the charging problem becomes the most important bottleneck problem in the development process of electric vehicles. The wireless charging technology can solve the interface limitation, safety problems and the like faced by the traditional conduction type charging, and is gradually developed into a main mode of charging the electric automobile. However, wired charging has a number of inconveniences. Under the background, the wireless charging technology of the electric automobile is developed, and the electric automobile is supplied with energy in a non-contact mode.

In the wireless charging process of the electric automobile, the inaccurate parking position of the automobile can lead to the severe performance reduction of a wireless power transmission system, and the power transmission efficiency is seriously influenced. Studies have shown that only 5% of drivers can park an electric vehicle well in a suitable charging position without any other assistance. Therefore, the car positioning problem becomes a major obstacle to the widespread use of the wireless charging system for electric vehicles.

In order to solve this problem, the transmitter coil and the receiver coil are positioned by triangulation. In the triangulation method, the receiving end has three coils, a receiving coil and two auxiliary coils. The transmitting end coil is excited by the resonance frequency of the three receiving end coils in sequence, and the accurate position of the transmitting coil relative to the receiving coil can be obtained by measuring the current on the transmitting end coil and calculating the transverse distance between the transmitting end coil and the three receiving end coils.

Disclosure of Invention

In order to position the transmitting coil and the receiving coil by using a triangulation positioning method, the invention designs a circuit topological structure for exciting the transmitting end coil in the triangulation positioning method, and the circuit topological structure can respectively work under three working frequencies suitable for three coils at a receiving end by controlling a switch in a circuit.

According to an aspect of the present invention, there is provided a circuit topology for exciting a transmitting side coil in triangulation, comprising:

branch T, branch T₁And branch T₂Said branch T comprising a switch S connected in series_TAnd a resonance capacitor C_TSaid branch T₁Comprising a series-connected switch S₁And a resonance capacitor C_T1Said branch T₂Comprising a series-connected switch S₂And a resonance capacitor C_T2；

DC power supply, and switch S_UResistance R_TInductor L_TAnd said branch T, branch T1 or branch T2 are connected in series;

switch S_DAnd the DC power supply and the switch S_UIn parallel with the resistor R_TInductor L_TAfter being connected in series with the branch circuit T and the branch circuit T₁Or branch T₂Are connected in parallel.

Further, the receiving terminal also comprises a receiving coil branch circuit which comprises a capacitor C connected in series_RResistance R_RAnd an inductance L_R。

Further, the device also comprises a receiving end first auxiliary coil branch circuit which comprises a capacitor C connected in series_R1Resistance R₁And an inductance L₁。

Further, the device also comprises a receiving end second auxiliary coil branch circuit which comprises a capacitor C connected in series_R2Resistance R₂And an inductance L₂。

According to another aspect of the present invention, there is provided a method for controlling a circuit topology for exciting a transmitting side coil in triangulation, comprising:

control switch S₁、S₂And S_TSetting a switch S_U、S_DThe switching frequency and the conduction time of the complementary work make the circuit topology structure work at f respectively_R、f₁、f₂Under three working frequencies;

measuring the current i of the transmitting end coil branch under three resonant frequencies_TRespectively, respectivelyCalculating the coupling distance between the transmitting coil and the receiving coil, between the transmitting coil and the first auxiliary coil and between the transmitting coil and the second auxiliary coil;

and judging whether the transmitting coil is in the induction area of the receiving coil, the first auxiliary coil and/or the second auxiliary coil according to the coupling distance.

Further, when the relative position between the transmitting coil and the receiving coil is measured, the switch S₁、S₂Normally open, switch S_TNormally closed, switch S_U、S_DComplementary operation at an operating frequency f_R。

Further, when the relative position between the transmitting coil and the first auxiliary coil is measured, the switch S_T、S₂Normally open, switch S₁Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₁。

Further, when the relative position between the transmitting coil and the second auxiliary coil is measured, the switch S_T、S₁Normally open, switch S₂Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₂。

Further, the three resonant frequencies are:

further, the method also comprises the steps of determining the area where the transmitting coil is located, and moving the receiving coil to enable the transmitting coil to reach the target area.

The circuit topology structure of the invention is realized by setting a switch S_U、S_DThe switching frequency and the conduction time of the transformer can be respectively operated under three resonant frequencies suitable for three coils of the receiving end.

The coupling distance between the transmitting coil and the three coils at the receiving side is calculated by measuring current information under three different resonant frequencies, so that whether the transmitting coil is in the induction area of the three coils at the receiving side can be respectively judged, and the area where the transmitting coil is located is further judged. After the area where the transmitting coil is located is determined, the transmitting coil can reach the target area through corresponding movement.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in greater detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.

Fig. 1 shows the induction areas of three coils on the receiving side and its partitions according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a circuit topology for exciting a transmitting side coil according to an embodiment of the present invention.

FIG. 3 is a diagram of simulated waveforms according to an embodiment of the present invention.

Fig. 4 is a diagram of an operation mode of a circuit topology according to an embodiment of the present invention.

Fig. 5 is a flow chart of the operational control of a circuit topology according to an embodiment of the present invention.

Fig. 6 is a flowchart of a method for controlling a circuit topology according to an embodiment of the present invention.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the triangulation method, a transmitting coil is provided at a transmitting end, and three coils are provided at a receiving end: the receiving coil, the first auxiliary coil and the second auxiliary coil are respectively provided with corresponding induction areas. The premise of adopting the triangulation method is that the transmitting coil is positioned in a common induction area of the receiving coil and the two auxiliary coils. However, in practical applications, accurate location information is not required, and therefore, a partitioning algorithm is introduced. From the single solution region between the inter-coil coupling coefficient and the lateral distance, the induction zone of the coil can be defined. As shown in FIG. 1, the induction zones of the three coils on the receiving side can be divided into 8 zones, namely, zone C and zone A₁、A₂、A₃、B₁、B₂、B₃、B₄. The area C is a target area, and the circle-Rx, the circle-1 and the circle-2 respectively represent induction areas of the receiving coil, the first auxiliary coil 1 and the second auxiliary coil 2. According to the overlapping condition of the three coil induction areas, the induction area ranges in which the 8 areas are respectively positioned can be distinguished.

The coupling distance between the transmitting coil and the three coils at the receiving side is calculated by measuring current information under three different resonant frequencies, so that whether the transmitting coil is in the induction area of the three coils at the receiving side can be respectively judged, and the area where the transmitting coil is located is further judged. After the area where the transmitting coil is located is determined, the transmitting coil can reach the target area through corresponding movement.

When the excitation source is on the transmitting side, in order to avoid mutual influence between the coils, the receiving coil and the two auxiliary coils should have different resonance frequencies, the alternating current excitation source of the transmitting coil should be sequentially switched to the three resonance frequencies, and the current i of the transmitting coil at the different resonance frequencies can be measured_TAnd then position information is obtained.

Specifically, the present invention provides a circuit topology structure of an excitation transmitting end coil in a triangulation method, including:

transmitting end branch T and branch T₁And branch T₂Said branch T comprising a switch S connected in series_TAnd a resonance capacitor C_TSaid branch T₁Comprising a series-connected switch S₁And a resonance capacitor C_T1Said branch T₂Comprising a series-connected switch S₂And a resonance capacitor C_T2；

DC power supply, and switch S_UResistance R_TInductor L_TAnd the branch T connected in parallel₁Or branch T₂Are connected in series;

switch S_DAnd the DC power supply and the switch S_UIn parallel with the resistor R_TInductor L_TAfter being connected in series withThe branch T and the branch T₁Or branch T₂Are connected in parallel.

Further, the receiving terminal also comprises a receiving coil branch circuit which comprises a capacitor C connected in series_RResistance R_RAnd an inductance L_R。

Further, the device also comprises a receiving end first auxiliary coil branch circuit which comprises a capacitor C connected in series_R1Resistance R₁And an inductance L₁。

Further, the device also comprises a receiving end second auxiliary coil branch circuit which comprises a capacitor C connected in series_R2Resistance R₂And an inductance L₂。

As shown in fig. 5, according to another aspect of the present invention, there is provided a control method for a circuit topology of an excitation transmitting side coil in triangulation, comprising:

control switch S₁、S₂And S_TNormally closed or normally open, setting switch S_U、S_DThe switching frequency and the conduction time of the complementary work make the circuit topology structure work at f respectively_R、f₁、f₂Under three working frequencies;

measuring the current i of the transmitter coil branch at three resonant frequencies_TRespectively calculating the coupling distances between the transmitting coil and the receiving coil, between the transmitting coil and the first auxiliary coil and between the transmitting coil and the second auxiliary coil;

and judging whether the transmitting coil is in the induction area of the receiving coil, the first auxiliary coil and/or the second auxiliary coil according to the coupling distance.

Further, when the relative position between the transmitting coil and the receiving coil is measured, the switch S₁、S₂Normally open, switch S_TNormally closed, switch S_U、S_DComplementary operation at an operating frequency f_R。

Further, when the relative position between the transmitting coil and the first auxiliary coil is measured, the switch S_T、S₂Normally open, switch S₁Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₁。

Further, when the relative position between the transmitting coil and the second auxiliary coil is measured, the switch S_T、S₁Normally open, switch S₂Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₂。

Further, the three resonant frequencies are:

to facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.

As shown in FIG. 2, the circuit topology includes an inductor L_R、L₁、L₂Equivalent inductances of the receiving coil of the receiving end, the first auxiliary coil 1 and the second auxiliary coil 2 are respectively; capacitor C_R、C_R1、C_R2The compensation capacitors are respectively a receiving coil, a first auxiliary coil 1 and a second auxiliary coil 2; resistance R_R、R₁、R₂The total equivalent resistance of the resonance branch of the receiving coil, the first auxiliary coil 1 and the second auxiliary coil 2 is respectively.

In particular, the transmitting terminal branch T comprises a switch S in series_TAnd a resonance capacitor C_TBranch T₁Comprising a series-connected switch S₁And a resonance capacitor C_T1Branch T₂Comprising a series-connected switch S₂And a resonance capacitor C_T2. Branch T, branch T₁And branch T₂Are connected in parallel.

DC power supply and switch S_UResistance R_TInductor L_TAnd branch T connected in parallel₁Or branch T₂Are connected in series. Switch S_DWith a direct current source and a switch S_UIn parallel with the resistor R_TInductor L_TAfter being connected in series with the branch circuit T and the branch circuit T₁Or branch T₂Are connected in parallel.

In this embodiment, the three coils on the receiving side are located at a zero coupling distance, and the mutual inductance between the coils is almost zero. R_T、L_TRespectively the parasitic resistance and the equivalent inductance of the transmitter coil. Switch S_T、S₁、S₂Respectively connected with a resonance capacitor C_T、C_T1、C_T2Connected in series to switch between different resonant frequencies, which are shown in the following formula. Switch S_U、S_DComplementary operation, capable of providing excitation signals of different frequencies.

The circuit topology shown in fig. 2 can be divided into three operating states, each operating at f_R、f₁、f₂At three resonant frequencies.

(1) When measuring the relative position between the transmitter coil and the receiver coil, the switch S₁、S₂Normally open, switch S_TNormally closed, switch S_U、S_DComplementary operation at an operating frequency f_R. By measuring the transmitting coil current i_TAnd calculating the coupling distance between the transmitting coil and the receiving coil, and further knowing whether the transmitting coil is in the induction area of the receiving coil.

(2) When measuring the relative position between the transmitting coil and the first auxiliary coil 1, the switch S_T、S₂Normally open, switch S₁Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₁. By measuring the transmitting coil current i_TAnd calculating the coupling coefficient between the transmitting coil and the first auxiliary coil 1, and further knowing whether the transmitting coil is in the induction area of the first auxiliary coil 1.

(3) When measuring the relative position between the transmitting coil and the second auxiliary coil 2, the switch S_T、S₁Normally open, switch S₂Normally closed, switch S_U、S_DComplementary operation at an operating frequency f₂. By measuringMeasuring the transmitter coil current i_TAnd calculating the coupling coefficient between the transmitting coil and the second auxiliary coil 2, and further knowing whether the transmitting coil is in the induction area of the second auxiliary coil 2.

By judging whether the transmitting coil is in the induction areas of the three coils on the receiving side, respectively, it is possible to know in which area the transmitting coil is. For example, if the transmitting coil is in the inductive region of the first auxiliary coil 1, but not in the inductive regions of the second auxiliary coil 2 and the receiving coil, then the transmitting coil is at a₁And (4) a zone.

The circuit topology shown in fig. 2 is specifically analyzed below by taking the measurement of the relative position between the transmitting coil and the receiving coil as an example. According to S_U、S_DThe working condition of (2) can be divided into two working modes.

(1)S_UConduction, S_DOff, S_TNormally closed, S₁、S₂Normally open, current flowing switch S_U，S_DVoltage at both ends is V_dc。

(2)S_UOff, S_DConduction, S_TNormally closed, S₁、S₂Normally open, current flowing switch S_D，S_DThe voltage across is 0.

Thus, it is equivalent to have an amplitude of V_dcIs connected to the resonance branch R_T-L_T-C_TThe frequency and the duty ratio are respectively controlled by a switch S_U、S_DThe switching frequency and the on-time. When the switching frequency is equal to f_RResonance will occur.

The PSIM simulation waveform diagram is shown in FIG. 3. In the simulation model, the switching frequency is 100k, the duty ratio is 0.5, R_T、C_T、L_TRespectively taking 1 omega, 0.253 muF and 10 muH, and inputting direct current voltage V_dc10V is taken.

In FIG. 3, Vgd and Vgu are the switch tubes S_D、S_UThe drive signal of (1). I is_ltTo flow through L_TOf current i_T，V_ctIs C_TThe voltage across. When S is_UConduction, S_DOff, S_TNormally closed, S₁、S₂When the switch is normally on, the current of the transmitting coil is positive, C_TResonant charging; when S is_UOff, S_DConduction, S_TNormally closed, S₁、S₂When the switch is normally on, the current of the transmitting coil is negative, C_TAnd (4) resonant discharge. Due to resonance, i_TApproximating a sine wave.

When the circuit topology has a resonance frequency of f₁、f₂In operation, the principle of operation is similar to that described above. Thus, fig. 4 can be derived from the circuit topology operating modes, and table 1 can be established.

TABLE 1 mode of operation

"1" indicates the on state of the switch, and "0" indicates the off state of the switch. As shown in table 1, effective switching states are (10100), (01100), (10010), (01010), (10001), and (01001). When the resonant frequency of the circuit topology is f_RWhen the switch state is (10100) and (01100); when the resonant frequency of the circuit topology is f₁When the switch state is (10010) and (01010); when the resonant frequency of the circuit topology is f₂When the number of the switches is greater than the predetermined number, the corresponding switch states are (10001) and (01001).

As shown in fig. 6, the process of the circuit topology control method of this embodiment is as follows:

first, the resonant branch T is excited₁At an operating frequency of f₁Measuring the transmitting coil current i_TComparing the currents i_TAnd a threshold current i_{T_th}If i is_T<i_{T_th}Then it can be determined that the transmitting coil is located within the sensing area of the first auxiliary coil 1, possibly at a₁、A₂、B₁、B₂And (4) the following steps. If i_T>i_{T_th}Then it can be determined that the transmitting coil is outside the sensing area of the first auxiliary coil 1, possibly at a₃、B₃、B₄And (4) the following steps.

Next, the resonant branch T is excited₂At an operating frequency off₂Measuring the transmitting coil current i_TComparing the currents i_TAnd a threshold current i_{T_th}If i is_T<i_{T_th}Then it can be determined that the transmitting coil is located within the sensing area of the second auxiliary coil 2, possibly at a₂、A₃、B₂、B₃And (4) the following steps. If i_T>i_{T_th}Then it can be determined that the transmitting coil is located outside the sensing area of the second auxiliary coil 2, possibly at a₁、B₁、B₄And (4) the following steps.

Next, the resonant branch T is excited with an operating frequency f_RMeasuring the transmitting coil current i_TComparing the currents i_TAnd a threshold current i_{T_th}If i is_T<i_{T_th}Then it can be determined that the transmitter coil is located within the sensing region of the receiver coil, possibly at B₁、B₂、B₃、B₄And (4) the following steps. If i_T>i_{T_th}Then it can be determined that the transmitter coil is outside the sensing area of the receiver coil, possibly at a₁、A₂、A₃And (4) the following steps.

And finally, taking intersection according to results obtained by three times of excitation, and judging the area where the transmitting coil is located.

It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is for the purpose of illustrating the advantageous effects of embodiments of the invention only and is not intended to limit embodiments of the invention to any examples given.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.