阅读说明：本技术 三角定位法中激励接收端线圈的电路拓扑结构及控制方法 (Circuit topology structure of excitation receiving 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接收端线圈的电路拓扑结构及控制方法,包括：接收线圈支路,包括串联的电容C-R、电感L-R和电阻R-R；开关S-R,与所述接收线圈支路并联；第一辅助线圈支路,包括串联的电容C-1、电感L-1和电阻R-1；开关S-1,与所述第一辅助线圈支路并联；第二辅助线圈支路,包括串联的电容C-2、电感L-2和电阻R-2；开关S-2,与所述第二辅助线圈支路并联；直流电源,与开关S、开关S-R、开关S-1、开关S-2串联连接。本发明的电路拓扑结构,通过设置开关互补工作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,可以使电路拓扑结构的接收线圈支路、第一辅助线圈支路和第二辅助线圈支路分别工作在相应线圈支路的谐振频率下。(The invention provides a circuit topological structure and a control method of an excitation receiving end coil in a triangulation location method, which comprises the following steps: a receiving coil branch including a capacitor C connected in series R Inductor L R And a resistance R R (ii) a Switch S R Connected in parallel with the receive coil branch; a first auxiliary winding branch including a capacitor C connected in series 1 Inductor L 1 And a resistance R 1 (ii) a Switch S 1 Connected in parallel with the first auxiliary winding branch; a second auxiliary winding branch including a capacitor C connected in series 2 Inductor L 2 And a resistance R 2 (ii) a Switch S 2 Connected in parallel with the second auxiliary winding branch; a direct-current power supply is arranged in the shell,and switch S, switch S R Switch S 1 Switch S 2 Are connected in series. According to the circuit topology structure, the resonant frequency of the circuit topology structure is adjusted by setting the switching frequency and the conduction time of the complementary work of the switches, so that the receiving coil branch, the first auxiliary coil branch and the second auxiliary coil branch of the circuit topology structure can work under the resonant frequency of the corresponding coil branches respectively.)

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

a receiving coil branch including a capacitor C connected in series_RInductor L_RAnd a resistance R_R；

Switch S_RConnected in parallel with the receive coil branch;

a first auxiliary winding branch including a capacitor C connected in series₁Inductor L₁And a resistance R₁；

Switch S₁Connected in parallel with the first auxiliary winding branch;

a second auxiliary winding branch including a capacitor C connected in series₂Inductor L₂And a resistance R₂；

Switch S₂Connected in parallel with the second auxiliary winding branch;

DC power supply, and switch S_RSwitch S₁Switch S₂Are connected in series.

2. The circuit topology for exciting the receiver coil in triangulation according to claim 1, further comprising: a transmitting end coil branch circuit including a capacitor C connected in series_TResistance R_TAnd an inductance L_T。

3. A method for controlling a circuit topology for exciting a receiving side coil in the triangulation method according to claim 1 or 2, comprising:

control switch S, S₁、S₂And S_RSetting the switching frequency and the conduction time of the complementary operation of the switches, so that a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the circuit topology structure respectively operate at the resonance frequency of the corresponding coil branches;

measuring the current i of the receiving coil branches respectively_RCurrent i of the first auxiliary winding branch₁And the current i of the second auxiliary winding branch₂Calculating 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.

4. Method for controlling the circuit topology for the excitation of the receiver coil in triangulation according to claim 3, characterized in that the switch S is used when the receiver coil branch is excited for measuring the relative position between the transmitter coil and the receiver coil₁、S₂Normally closed, switch S and switch S_RAnd (4) complementary operation.

5. The method of claim 4, wherein the switches S and S are set to control the circuit topology for exciting the receiver coil in triangulation_RThe working modes are as follows:

s is conducted, S_ROpen, switch S₁、S₂Normally closed, S_RVoltage at both ends is V_dc；

S is broken, S_ROn, switch S₁、S₂Normally closed, S_RThe voltage across is 0.

6. Method for controlling the circuit topology for the excitation of the receiver coil in triangulation according to claim 3, characterized in that the switch S is used when the first auxiliary coil branch is excited for measuring the relative position between the transmitter coil and the first auxiliary coil_R、S₂Normally closed, switch S and switch S₁And (4) complementary operation.

7. The method of claim 6, wherein the switches S and S are set to control the circuit topology for exciting the receiver coil in triangulation₁The working modes are as follows:

s is conducted, S₁Open, switch S_R、S₂Normally closed, S₁Voltage at both ends is V_dc；

S is broken, S₁On, switch S_R、S₂Normally closed, S₁The voltage across is 0.

8. Method for controlling the circuit topology for the excitation of the receiver coil in triangulation according to claim 3, characterized in that the switch S is used when the second auxiliary coil branch is excited for measuring the relative position between the transmitter coil and the second auxiliary coil_R、S₁Normally closed, switch S and switch S₂And (4) complementary operation.

9. The method of claim 8, wherein the switches S and S are arranged to control a circuit topology for exciting a receiving coil in triangulation₂The working modes are as follows:

s is conducted, S₂Open, switch S_R、S₁Normally closed, S₂Voltage at both ends is V_dc；

S is broken, S₂On, switch S_R、S₁Normally closed, S₂The voltage across is 0.

10. The method of claim 3, 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 of an excitation receiving end coil in the wireless charging triangulation method of an electric automobile and a control method.

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. And sequentially exciting the three coils of the receiving end, and calculating the transverse distances between the transmitting end coil and the three coils of the receiving end by measuring the currents on the three coils, so that the accurate position of the transmitting coil relative to the receiving coil can be obtained.

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 three coils at a receiving end in the triangulation positioning method, and a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the circuit topological structure can respectively work under the resonance frequency of the corresponding coil branches by controlling switches in a circuit.

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

a receiving coil branch including a capacitor C connected in series_RInductor L_RAnd a resistance R_R；

Switch S_RConnected in parallel with the receive coil branch;

a first auxiliary winding branch including a capacitor C connected in series₁Inductor L₁And a resistance R₁；

Switch S₁Connected in parallel with the first auxiliary winding branch;

a second auxiliary winding branch including a capacitor C connected in series₂Inductor L₂And a resistance R₂；

Switch S₂Connected in parallel with the second auxiliary winding branch;

DC power supply, and switch S_RSwitch S₁Switch S₂Are connected in series.

Further, the device also comprises a transmitting end coil branch circuit which comprises a capacitor C connected in series_TResistance R_TAnd an inductance L_T。

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

control switch S, S₁、S₂And S_RSetting the switching frequency and the conduction time of the complementary operation of the switches, so that a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the circuit topology structure respectively operate at the resonance frequency of the corresponding coil branches;

measuring the current i of the receiving coil branches respectively_RCurrent i of the first auxiliary winding branch₁And the current i of the second auxiliary winding branch₂Calculating 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 receiving coil branch is excited for measuring the relative position between the transmitting coil and the receiving coil, a switch S₁、S₂Normally closed, switch S and switch S_RAnd (4) complementary operation.

Further, the switches S and S_RThe working modes are as follows:

s is conducted, S_ROpen, switch S₁、S₂Normally closed, S_RVoltage at both ends is V_dc；

S is broken, S_ROn, switch S₁、S₂Normally closed, S_RThe voltage across is 0.

Further, when said first auxiliary coil branch is excited for measuring the relative position between the transmitting coil and the first auxiliary coil, a switch S_R、S₂Normally closed, switch S and switch S₁And (4) complementary operation.

Further, the switches S and S₁The working modes are as follows:

s is conducted, S₁Open, switch S_R、S₂Normally closed, S₁Voltage at both ends is V_dc；

S is broken, S₁On, switch S_R、S₂Normally closed, S₁The voltage across is 0.

Further, when said second auxiliary coil branch is excited for measuring the relative position between the transmitting coil and the second auxiliary coil, a switch S_R、S₁Normally closed, switch S and switch S₂And (4) complementary operation.

Further, the switches S and S₂The working modes are as follows:

s is conducted, S₂Open, switch S_R、S₁Normally closed, S₂Voltage at both ends is V_dc；

S is broken, S₂On, switch S_R、S₁Normally closed, S₂The voltage across is 0.

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.

According to the circuit topology structure, the resonant frequency of the circuit topology structure is adjusted by setting the switching frequency and the conduction time of the complementary work of the switches, so that the receiving coil branch, the first auxiliary coil branch and the second auxiliary coil branch of the circuit topology structure can work under the resonant frequency of the corresponding coil branches respectively.

The current information is measured when the receiving coil branch, the first auxiliary coil branch and the second auxiliary coil branch are respectively excited, the coupling distance between the transmitting coil and the three coils at the receiving side is calculated, whether the transmitting coil is in the induction area of the three coils at the receiving side can be respectively judged, and then the area where the transmitting coil is located is judged. After the area where the transmitting coil is located is determined, the transmitting coil can reach a target area by correspondingly moving the receiving coil.

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 of an excitation receiving end coil according to an embodiment of the invention.

Fig. 3 is a diagram of an operation mode of a circuit topology according to an embodiment of the present invention.

Fig. 4 is a simulated waveform diagram of exciting a receiving coil at a receiving end according to an embodiment of the 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 area between the inter-coil coupling coefficient and the lateral distance, the inductive area 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 induction areas of the three coils, the induction area range in which the 8 areas are respectively positioned can be distinguished.

Preferably, the three coils of the receiving end can be sequentially excited, and the accurate position of the transmitting coil relative to the receiving coil can be obtained by measuring the currents on the three coils and calculating the transverse distances between the coil of the transmitting end and the three coils of the receiving end. After the area where the transmitting coil is located is determined, the transmitting coil can reach the target area through the movement of the receiving end.

The invention provides a circuit topological structure of an excitation receiving end coil in a triangulation location method, which comprises the following steps:

a receiving coil branch including a capacitor C connected in series_RInductor L_RAnd a resistance R_R；

Switch S_RAnd, andthe receiving coil branches are connected in parallel;

a first auxiliary winding branch including a capacitor C connected in series₁Inductor L₁And a resistance R₁；

Switch S₁Connected in parallel with the first auxiliary winding branch;

a second auxiliary winding branch including a capacitor C connected in series₂Inductor L₂And a resistance R₂；

Switch S₂Connected in parallel with the second auxiliary winding branch;

DC power supply, and switch S_RSwitch S₁Switch S₂Are connected in series.

Further, the device also comprises a transmitting end coil branch circuit which comprises a capacitor C connected in series_TResistance R_TAnd an inductance L_T。

As shown in fig. 5, the present invention further provides a method for controlling the operation of a circuit topology structure of an excitation receiving end coil in a triangulation method, including:

control switch S, S₁、S₂And S_RSetting the switching frequency and the conduction time of the complementary operation of the switches, so that a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the circuit topology structure respectively operate at the resonance frequency of the corresponding coil branches;

measuring the current i of the receiving coil branches respectively_RCurrent i of the first auxiliary winding branch₁And the current i of the second auxiliary winding branch₂Calculating 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 receiving coil branch is excited for measuring the relative position between the transmitting coil and the receiving coil, a switch S₁、S₂Normally closed, switch S and switch S_RAnd (4) complementary operation.

Further, the switches S and S_RThe working modes are as follows:

s is conducted, S_ROpen, switch S₁、S₂Normally closed, S_RVoltage at both ends is V_dc；

S is broken, S_ROn, switch S₁、S₂Normally closed, S_RThe voltage across is 0.

Further, when said first auxiliary coil branch is excited for measuring the relative position between the transmitting coil and the first auxiliary coil, a switch S_R、S₂Normally closed, switch S and switch S₁And (4) complementary operation.

Further, the switches S and S₁The working modes are as follows:

s is conducted, S₁Open, switch S_R、S₂Normally closed, S₁Voltage at both ends is V_dc；

S is broken, S₁On, switch S_R、S₂Normally closed, S₁The voltage across is 0.

Further, when said second auxiliary coil branch is excited for measuring the relative position between the transmitting coil and the second auxiliary coil, a switch S_R、S₁Normally closed, switch S and switch S₂And (4) complementary operation.

Further, the switches S and S₂The working modes are as follows:

s is conducted, S₂Open, switch S_R、S₁Normally closed, S₂Voltage at both ends is V_dc；

S is broken, S₂On, switch S_R、S₁Normally closed, S₂The voltage across is 0.

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.

In order to sequentially excite the three coils on the receiving side to obtain current information, the methodThe embodiment proposes a circuit topology as shown in fig. 2. Inductor L in FIG. 2_R、L₁、L₂Equivalent inductances of a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the receiving end are respectively; capacitor C_R、C₁、C₂The compensation capacitors are respectively a receiving coil branch, a first auxiliary coil branch and a second auxiliary coil branch of the receiving end; resistance R_R、R₁、R₂The total equivalent resistance of the receiving coil branch, the first auxiliary coil branch and the second auxiliary coil branch of the receiving end are respectively.

In particular, the receiving coil branch comprises a capacitor C connected in series_RInductor L_RAnd a resistance R_R；

A first auxiliary winding branch including a capacitor C connected in series₁Inductor L₁And a resistance R₁；

A second auxiliary winding branch including a capacitor C connected in series₂Inductor L₂And a resistance R₂；

Switch S_R、S₁、S₂The first auxiliary coil branch and the second auxiliary coil branch are respectively connected in parallel;

DC power supply, and switch S_RSwitch S₁Switch S₂Are connected in series.

Further, the device also comprises a transmitting end coil branch circuit which comprises a capacitor C connected in series_TResistance R_TAnd an inductance L_T。

As shown in FIG. 2, there are a total of 4 switches, S, S respectively_R、S₁、S₂So there should be 16 combinations, i.e. 16 modes of operation, as shown in table 1.

When the receiving coil of the receiving end is energized, the two auxiliary coils should be short-circuited, so that the switch S₁、S₂Normally closed, switch S and switch S_RAnd (4) complementary operation.

When the first auxiliary winding 1 of the receiving side is energized, the switch S_R、S₂Normally closed, switch S and switch S₁Complementary to each otherAnd (6) working.

When the second auxiliary winding 2 of the receiving side is energized, the switch S_R、S₁Normally closed, switch S and switch S₂And (4) complementary operation.

Therefore, the modes 8 and 15 are used to excite the receiving-end receiving coil, the modes 8 and 12 are used to excite the receiving-end first auxiliary coil 1, and the modes 8 and 14 are used to excite the receiving-end second auxiliary coil 2. The effective switch states are (1011), (1101), (1110) and (0111), and the other modes are all invalid modes for the application of the present embodiment.

TABLE 1 all switching modes of the switching tube

Fig. 3 corresponds to a mode diagram for exciting the respective coils.

Taking the case of the receiver coil being excited, for example, according to S, S_RThe working condition of (2) can be divided into two working modes.

S is conducted, S_ROpen, switch S₁、S₂Normally closed, S_RVoltage at both ends is V_dc；

S is broken, S_ROn, switch S₁、S₂Normally closed, S_RThe voltage across is 0.

Thus, it is equivalent to have an amplitude of V_dcIs connected to the resonance branch of the receiving coil, and the frequency and the duty ratio are respectively controlled by a switch S, S_RThe switching frequency and the on-time. Resonance will occur when the switching frequency is equal to the resonance frequency of the resonance branch of the receiving coil.

The PSIM simulation waveform diagram is shown in FIG. 4. In the simulation model, the switching frequency is 100kHz, the duty ratio is 0.5, R_R、C_R、L_RRespectively taking 1 omega, 0.253 muF and 10 muH, and inputting direct currentPressure V_dc10V is taken. In FIG. 4, Vg, Vg1, Vg2, VgR are switching tubes S, respectively₁，S₂And S_RThe drive signal of (1). IL1, IL2 and ILR are the currents flowing through the first auxiliary winding, the second auxiliary winding and the receiving winding of the receiving terminal, respectively, and VSR is the switching tube S_RThe voltage across the terminals.

As can be seen from fig. 4, the current flowing through the receiving coil is sinusoidal due to the resonance, while the current flowing through the auxiliary coil is 0, i.e. the individual coil excitations do not influence each other.

When S is conducted, S_ROff, switch S₁、S₂When normally closed, the receiving coil current is positive, C_RResonant charging; when S is_ROn, S off, switch S₁、S₂When normally closed, the receiving coil current is negative, C_RAnd (4) resonant discharge. Due to resonance, i_RApproximating a sine wave.

When measuring the current i of two auxiliary coils₁、i₂The working principle is similar to that described above. Thus, table 2 can be established according to the circuit topology operating mode. Table 2 lists the effective modes of operation for exciting the individual coils.

"1" indicates the on state of the switch, and "0" indicates the off state of the switch. As shown in Table 2, the effective switch states include (1011), (1101), (1110), (0111) and (0111)₁、(0111)_R、(0111)₂. Measuring a first auxiliary coil current i₁When the switch states are (1011) and (0111)₁(ii) a Measuring the current i of the receiving coil_RWhen the state of the corresponding switch is (1101) and (0111)_R(ii) a Measuring a second auxiliary coil current i₂When the corresponding switch states are (1110) and (0111)₂。

TABLE 2 mode of operation

As shown in fig. 6, the method for controlling the circuit topology structure of the present embodiment includes:

first of all, the first auxiliary coil 1 is excited with a working frequency f₁Measuring the current i of the first auxiliary winding 1₁Comparing the currents i₁And a threshold current i_{1_th}If i is₁<i_{1_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 i₁>i_{1_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 second auxiliary coil 2 is excited at an operating frequency f₂Measuring the current i of the second auxiliary winding 2₂Comparing the currents i₂And a threshold current i_{2_th}If i is₂<i_{2_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 i₂>i_{2_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 receiving coil is excited with an operating frequency f_RMeasuring the current i of the receiving coil_RComparing the currents i_RAnd a threshold current i_{R_th}If i is_R<i_{R_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_R>i_{R_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 intended only to illustrate the benefits of embodiments of the invention 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.