Wireless charging system with position detection function and position adjustment method thereof

Abstract

The present application provides a wireless charging system with position detection function and its position adjustment method, which is used to solve the problem that the coil of the multiplexed coupling mechanism as a detection coil can only detect a single direction or has low accuracy. The system includes an energy transmission component and a signal transmission component. The energy transmission component includes a power transmission coil L P , power receiving coil L S and magnetic integrated resonant coil L f1 , the signal transmission component includes a signal transmitting coil L DP and signal receiving coil L DS ; Power transmitting coil L P , magnetic integrated resonant coil L f1 and signal transmitting coil L DP The power receiving coil L is stacked in sequence. S and signal receiving coil L DS Stacked setting, when detecting position, magnetic integrated resonant coil L f1 and signal receiving coil L DS The detection coils are used to detect the position offset of the X-axis and the Y-axis respectively. This application realizes the detection of the position in two directions at the same time, reduces the complexity of the system through the reuse of coils, and improves the utilization rate of the coils.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to a wireless charging system with a position detection function and a position adjustment method thereof. Background Art

[0002] In-depth research has been conducted both domestically and internationally on the issue of receiver position detection in electric vehicle wireless charging (EV-WPT) systems, yielding numerous results. Based on the detection method, these can be broadly categorized as non-magnetic field induction and magnetic field induction. Non-magnetic field induction methods include cameras, RFID, UWB, and Wi-Fi. However, Wi-Fi and UWB positioning technologies offer lower alignment accuracy, typically exceeding 10 cm. Camera and RFID positioning technologies can achieve centimeter-level alignment accuracy, but camera positioning is significantly affected by inclement weather. Furthermore, both technologies are costly and only locate the vehicle and the marker; they cannot determine the alignment of the primary and secondary magnetic coupling mechanisms. Magnetic field induction uses a detection coil to detect changes in the magnetic field, identifying changes in the receiver's position. There are two different types of detection coils: one is a separate detection coil designed to avoid interfering with the system coupling mechanism's coil; the other reuses the system coupling mechanism's coil as a detection coil.

[0003] In EV-WPT systems, magnetic field induction technology is required to detect the position of the receiver to better ensure power and efficiency. Existing research methods for detecting the receiver's position include using four detection coils symmetrically placed at the four corners of the coupling mechanism to detect the receiver's position, using orthogonal coils wrapped around the transmitting coupling mechanism to determine the receiver's alignment, using time-division multiplexing to detect the position of the receiving coil using the transmitting coil during the alignment phase, and using compensation coils to determine whether the receiver is aligned during the alignment phase through topology switching. However, existing position detection methods that use detection coils alone increase system cost and complexity, and using the coils of the multiplexed coupling mechanism as detection coils often suffer from the problem of only being able to detect a single direction or having low accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a wireless charging system with position detection function and a position adjustment method thereof. This is to solve the problem that the existing position detection method using a single detection coil increases the cost and complexity of the system, while the coil of the multiplexed coupling mechanism as the detection coil can only detect a single direction or has low accuracy.

[0005] A wireless charging system with a position detection function includes an energy transmission component and a signal transmission component. The energy transmission component includes a power transmission coil L P , power receiving coil L S and magnetic integrated resonant coil L f1The signal transmission component includes a signal transmitting coil L DP and signal receiving coil L DS ;

[0006] The power transmitting coil L P , magnetic integrated resonant coil L f1 and signal transmitting coil L DP The power receiving coil L is stacked in sequence. S and signal receiving coil L DS The stacked arrangement, when detecting the position, the magnetic integrated resonant coil L f1 and signal receiving coil L DS The detection coils detect position deviations in the X and Y axes.

[0007] Optionally, the power transmitting coil L P and power receiving coil L S All are Q-type coils;

[0008] The signal transmitting coil L DP and signal receiving coil L DS They are all DD type coils symmetrical along the X axis, and the magnetic integrated resonant coil L f1 It is a DD type coil that is symmetrical along the Y axis.

[0009] Optionally, the energy transmission component further includes a transmitting end transmission circuit and a receiving end transmission circuit;

[0010] The transmitting end transmission circuit includes a DC power supply U connected in sequence DC , an inverter circuit and a primary compensation circuit, the output end of the primary compensation circuit is connected to the power transmitting coil L P connect;

[0011] The receiving end transmission circuit includes a secondary side compensation circuit and a rectifier filter circuit connected in sequence, and the input end of the secondary side compensation circuit is connected to the power receiving coil L S , the output end of the rectifier filter circuit and the load R L connect.

[0012] Optionally, the primary side compensation circuit and the secondary side compensation circuit constitute an LCC-S resonant compensation network.

[0013] Optionally, the transmitting end transmission circuit further includes a circuit for controlling the magnetic integrated resonant coil L f1 A single-pole double-throw switch S connected to or disconnected from the primary compensation circuit;

[0014] The input end of the single-pole double-throw switch S is connected to an output end of the inverter circuit, and a control end A of the single-pole double-throw switch S is connected to the magnetic integrated resonant coil L. f1One end is connected to the other control end B of the single-pole double-throw switch S and the magnetic integrated resonant coil L f1 The other end of each is connected to an input end of the primary compensation circuit.

[0015] Optionally, during position detection, the input terminal S of the single-pole double-throw switch is connected to the control terminal B, and the magnetic integrated resonant coil L f1 The primary side compensation circuit is not connected;

[0016] During wireless charging, the input terminal S of the single-pole double-throw switch is connected to the control terminal A, and the magnetic integrated resonant coil L f1 Connect to the primary side compensation circuit.

[0017] Optionally, the signal transmission component further includes a signal modulation circuit and a signal mediation and acquisition circuit;

[0018] The output end of the signal modulation circuit is connected to the signal transmitting coil L DP Connect the input end of the signal modulation and acquisition circuit to the signal receiving coil L DS connect.

[0019] A method for adjusting the position of a wireless charging system with a position detection function is provided, which is used to adjust the position of a receiving end of the wireless charging system with a position detection function. The specific steps are as follows:

[0020] S1: Control the input terminal S of the single-pole double-throw switch to be connected to the control terminal B;

[0021] S2: Acquisition signal receiving coil L DS The induced voltage is used to determine whether there is an offset in the Y-axis direction and adjust the position of the receiving end in the Y-axis direction;

[0022] S3: Collect magnetic integrated resonant coil L f1 The induced voltage and the phase difference with the inverter output voltage are used to determine whether there is an offset in the X-axis direction and adjust the position of the receiving end in the X-axis direction.

[0023] Optionally, the specific method for adjusting the position of the receiving end in the Y-axis direction in step S2 is:

[0024] If the signal receiving coil L DS If the induced voltage is greater than 0, it is determined that the receiving end is offset in the Y-axis direction, and the position of the receiving end in the Y direction is adjusted, and the signal receiving coil L is collected in real time. DS The induced voltage until the signal receiving coil L DS When the induced voltage is equal to 0V, the Y-axis direction correction is completed.

[0025] Optionally, the specific method for adjusting the position of the receiving end in the X-axis direction in step S3 is:

[0026] If the magnetic integrated resonant coil L f1 When the induced voltage is greater than 0V, it is determined that the receiving end is offset in the X-axis direction, and the offset direction is determined based on the phase difference;

[0027] According to the offset direction, adjust the position of the receiving end in the X direction and collect the magnetic integrated resonant coil L in real time. f1 The induced voltage until the magnetic integrated resonant coil L f1 When the induced voltage is equal to 0V, the X-axis direction correction is completed.

[0028] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0029] 1. In the position detection stage, the present application reuses the magnetic integrated resonant coil and the signal receiving coil to detect the alignment status of the receiving end on the X-axis and Y-axis, and simultaneously realizes the detection of positions in two directions. The reuse of the coils reduces the complexity of the system and improves the utilization rate of the coils.

[0030] 2. This application identifies whether an offset occurs on the X-axis and Y-axis by collecting the induced voltage of the magnetic integrated resonant coil and the signal receiving coil, identifies the offset direction on the X-axis based on the phase difference, and adjusts the position of the receiving end based on the identification result. The alignment accuracy of the receiving end is high.

[0031] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings of the present invention are described below.

[0033] Figure 1 FIG. 4 is an equivalent circuit diagram of a wireless charging system with a position detection function according to the present invention.

[0034] Figure 2 This is an exploded view of the coupling mechanism of the wireless charging system with position detection function of the present invention.

[0035] Figure 3 This is a structural diagram of the coupling mechanism of the wireless charging system with position detection function of the present invention.

[0036] Figure 4 This is the equivalent circuit model of the system during the wireless charging process of the present invention.

[0037] Figure 5This is a diagram of the misalignment of the signal receiving coil at the receiving end along the positive direction of the Y axis in the simulation of the present invention.

[0038] Figure 6 It is a vector diagram of the inverter voltage and the induced voltage of the magnetic integrated resonant coil of the system of the present invention.

[0039] Figure 7 It is the equivalent circuit model of the system during the position detection process of the system of the present invention.

[0040] Figure 8 Graph showing the variation of the induced voltage of the signal receiving coil with ΔY and the variation of the induced voltage of the magnetic integrated resonant coil with ΔX according to the present invention.

[0041] Figure 9 This is a graph showing how the induced voltage of the signal receiving coil of the present invention changes with ΔY.

[0042] Figure 10 This is a graph showing how the induced voltage of the magnetic integrated resonant coil of the present invention changes with ΔX.

[0043] Figure 11 This is a comparison diagram of the phase difference between the inverter output voltage and the induced voltage of the magnetic integrated resonant coil in the system simulation of the present invention.

[0044] Figure 12 The waveforms of the output voltage and current of the system inverter in the system simulation of the present invention are shown.

[0045] Figure 13 Graph showing system output power and transmission efficiency in the system simulation of the present invention.

[0046] Figure 14 This is a diagram showing the effect of signal transmission rate in the system simulation of the present invention.

[0047] Figure 15 This is a diagram showing the accuracy of signal transmission in the system simulation of the present invention.

[0048] In the picture: L P is the power transmitting coil; L S is the power receiving coil; L f1 is the magnetic integrated resonant coil; L DP is the signal transmitting coil; L DS It is the signal receiving coil. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and examples.

[0050] Example 1:

[0051] like Figure 1 A wireless charging system with a position detection function is shown, which includes an energy transmission component and a separate signal transmission component.

[0052] The energy transmission component includes a transmitting end transmission circuit and a receiving end transmission circuit, and the transmitting end transmission circuit includes a DC power supply U connected in sequence. DC , inverter circuit and primary compensation circuit, the output end of the primary compensation circuit is connected to the power transmitting coil L P connect;

[0053] The receiving end transmission circuit includes a secondary side compensation circuit and a rectifier filter circuit connected in sequence, and the input end of the secondary side compensation circuit is connected to the power receiving coil L S , the output end of the rectifier filter circuit and the load R L connect.

[0054] In this embodiment, the inverter circuit is a full-bridge inverter composed of Q1-Q4, and the rectifier filter circuit includes four diodes D1-D4 and a filter capacitor C d The rectifier formed.

[0055] like Figure 1 As shown, the signal transmission component also includes a signal modulation circuit and a signal modulation and acquisition circuit. The output end of the signal modulation circuit is connected to the signal transmitting coil L DP Connect the input end of the signal modulation and acquisition circuit to the signal receiving coil L DS connect.

[0056] like Figure 1 As shown, it also includes a magnetic integrated resonant coil L f1 , the power transmitting coil L P , magnetic integrated resonant coil L f1 and signal transmitting coil L DP The power receiving coil L is stacked in sequence and aligned with the center points. S and signal receiving coil L DS The coils at the transmitter and receiver are stacked and aligned with each other, so they are decoupled from each other.

[0057] like Figure 2 and Figure 3 As shown, in order to eliminate the coupling between the power coil, the magnetic integrated resonant coil and the signal coil and reduce the complexity of the system, the power transmitting coil L P and power receiving coil L S Q-type coils are selected, and the signal transmitting coil L DP and signal receiving coil L DS The DD type coils are selected to be symmetrical along the X axis, and the magnetic integrated resonant coil L f1 Select a DD-type coil that is symmetrical along the Y axis.

[0058] In this embodiment, when the electric vehicle enters the parking space, the position offset of the receiving end is decomposed into two variables, ΔX and ΔY. In order to achieve lightweight coupling mechanism of the receiving end and reduce the complexity of the system, the magnetic integrated resonant coil L is used. f1 and signal receiving coil L DS The detection coils detect position deviations in the X and Y axes.

[0059] like Figure 1 As shown, in order to better meet the demand for lightweight receiving-end devices, the primary-side compensation circuit and the secondary-side compensation circuit often use an LCC-S resonant compensation network.

[0060] In this embodiment, if Figure 1 As shown, the primary compensation circuit includes a primary compensation inductor L f2 , primary compensation capacitor C f And the primary compensation capacitor C p The primary compensation inductor L f2 One end of the primary compensation inductor L is connected to an output end of the inverter circuit. f2 The other end of the primary compensation capacitor C f One end is connected to the power transmitting coil L P One end of the primary compensation capacitor C p One end of the power transmitting coil L P The other end is connected to the primary compensation capacitor C p The other end of the primary compensation capacitor C f to the other end of the

[0061] In this embodiment, if Figure 1 As shown, the secondary side compensation circuit includes a secondary side compensation capacitor C S , secondary side compensation capacitor C S One end of the power receiving coil L S Connect the secondary compensation capacitor C S The other output end is connected to an output end of the rectifier and filter circuit.

[0062] like Figure 1 As shown, the transmitting end transmission circuit also includes a circuit for controlling the magnetic integrated resonant coil L f1 a single-pole double-throw switch connected to or disconnected from the primary compensation circuit;

[0063] The input terminal S of the single-pole double-throw switch is connected to an output terminal of the inverter circuit, and a control terminal A of the single-pole double-throw switch is connected to the magnetic integrated resonant coil L. f1 One end is connected to the other control end B of the single-pole double-throw switch and the magnetic integrated resonant coil L f1The other end of each is connected to an input end of the primary compensation circuit.

[0064] In this embodiment, in order to achieve impedance balance of the compensation network and avoid large current shock damage to the system during the position detection phase, the compensation inductor L f Divided into two series compensation inductors, where L f1 The magnetically integrated resonant coil is magnetically integrated in the transmitting end coupling mechanism, L f2 It is a separate compensation inductor installed in the inverter box. During position detection, the input terminal S of the single-pole double-throw switch is connected to the control terminal B, and the magnetic integrated resonant coil L f1 and signal receiving coil L DS As detection coils, they detect the position offset of the X-axis and Y-axis respectively. When the receiving end and the transmitting end are aligned, the system enters the charging stage, the input end S is connected to the control end A, and the system starts high-power charging. In the system charging stage, the equivalent circuit model of the EV-WPT system is as follows: Figure 4 shown.

[0065] In this embodiment, when the system is in a resonant state, the expression of the system angular frequency ω is:

[0066]

[0067] Right now:

[0068]

[0069] According to Kirchhoff's voltage law, the KVL equations of the system are listed as follows:

[0070]

[0071] Considering the actual situation, the magnetic integrated resonant coil L f1 The internal resistance R Lf , power transmitting coil L P The internal resistance R P and the internal resistance R of the power receiving coil S Generally several mΩ, much smaller than the load resistance R L Therefore, in the theoretical analysis, the influence of the coil internal resistance is ignored, and the input and output voltage, current and output power characteristics of the system are simplified. The solution is:

[0072]

[0073] In ideal conditions, when the system coupling mechanism is aligned, M pf =0uH and M sf =0uH can simplify the above formula to:

[0074]

[0075] The output voltage, output power and efficiency of the system are obtained as follows:

[0076]

[0077] It can be seen that by selecting the shapes of the magnetic integrated resonant coil and the power coil, the design difficulty of the system can be simplified, thereby realizing the constant current input and constant voltage output characteristics of the conventional LCC-S resonant compensation network.

[0078] Example 2:

[0079] A method for adjusting the position of a wireless charging system with a position detection function is provided, for adjusting the position of a receiving end of the wireless charging system with a position detection function described in Example 1, and the specific steps are as follows:

[0080] S1: Control the input terminal S of the single-pole double-throw switch to be connected to the control terminal B;

[0081] S2: Acquisition signal receiving coil L DS The induced voltage of the signal receiving coil L DS If the induced voltage is greater than 0, it is determined that the receiving end is offset in the Y-axis direction, and the position of the receiving end in the Y direction is adjusted, and the signal receiving coil L is collected in real time. DS The induced voltage until the signal receiving coil L DS When the induced voltage is equal to 0V, the Y-axis direction correction is completed.

[0082] S3: Collect magnetic integrated resonant coil L f1 The induced voltage and the phase difference with the inverter output voltage, if the magnetic integrated resonant coil L f1 When the induced voltage is greater than 0V, it is determined that the receiving end is offset in the X-axis direction, and the offset direction is determined based on the phase difference;

[0083] According to the offset direction, adjust the position of the receiving end in the X direction and collect the magnetic integrated resonant coil L in real time. f1 The induced voltage until the magnetic integrated resonant coil L f1 When the induced voltage is equal to 0V, the X-axis direction correction is completed.

[0084] In this embodiment, the magnetic integrated resonant coil L f1 and signal receiving coil L DS Both are DD type coils, with the same position detection principle, with the signal receiving coil L DS For example, the receiving end coupling mechanism is offset along the positive direction of the Y axis as shown in the figure Figure 5 As shown. The mutual inductance of the Q-type coil and the DD-type coil can be expressed as:

[0085]

[0086] When the receiving end coupling mechanism is offset along the positive direction of the Y axis, the relative position of the receiving end coupling mechanism and the ground end coupling mechanism will have three situations. Figure 5 As shown, from Figure 5 (a) to Figure 5 (b) When M changes, it gradually increases from 0 to M max .from Figure 5 (b) to Figure 5 (c) When M changes from M max Gradually decreases to 0. When the receiving end deflects along the negative direction of the Y axis, due to the symmetry of the coupling mechanism design, the change of M is similar to that when deflected in the positive direction, except that the direction of cutting the magnetic lines of force is opposite. Therefore, the change curve of M is consistent, and the direction of the induced current is opposite.

[0087] Considering the restriction of the parking board on the Y-axis direction when the electric vehicle is parked, the mutual inductance M of the electric vehicle on the Y-axis is smaller than M max , then in the process of Y axis direction ΔY→0, when the offset in the Y axis direction is 0, the signal receiving coil L DS and power transmitting coil L P The mutual inductance of the signal receiving coil L becomes 0μH, that is, DS The induced voltage decreases to 0V, at which point it can be determined that the coupling mechanism at the receiving end is aligned in the Y-axis direction.

[0088] Similarly, because the magnetic integrated resonant coil L f1 The two D-type coils are symmetrical along the Y-axis, so the magnetic integrated resonant coil L f1 When the coupling mechanism at the receiving end is offset, the magnetic integration resonant coil L is sampled. f1 The voltage can detect whether ΔX is 0 and is not affected by the offset in the y-axis direction. When the receiving end is offset in the positive (negative) direction of the X-axis, the magnetic integrated resonant coil L f1 The voltage and power of the receiving coil L S The voltages of the power receiving coil L have a phase difference of +90 (-90) degrees. S Voltage and power transmitting coil L P The phase difference of the voltage is 90 degrees, so the magnetic integrated resonant coil L f1 and power transmitting coil L P The voltage phase difference is 0 (180) degrees. After the system's inverter voltage passes through the primary LCC compensation network, it will have a phase difference with the voltage of the power transmission coil. The vector diagram of the inverter voltage and the resonant coil induced voltage is as follows: Figure 6 As shown. Only when the receiving end coupling mechanism shifts from the positive direction to the negative direction, the phase difference will change from 0+α to 0-α, and vice versa. Therefore, compared with the magnetic integrated resonant coil L f1The phase difference between the voltage and the inverter voltage can be used to determine the X-axis offset direction.

[0089] In the position detection stage, the system equivalent circuit model is as follows Figure 7 As shown; Ignoring the influence of the internal resistance of each coil, the system equation of the equivalent circuit model can be expressed as:

[0090]

[0091] The solution can be obtained as follows:

[0092]

[0093] Where:

[0094]

[0095] When the X-axis and Y-axis are offset, M sf and M PDS The value is much larger than M fDS , we can determine the primary and secondary factors that determine the current change. Signal receiving coil L DS The induced voltage and magnetic integration resonant coil L f1 The induced voltage in the detection coil circuit can be expressed as:

[0096]

[0097] The induced voltage of the detection coil is further obtained as:

[0098]

[0099] From the above formula, we can get the signal receiving coil L DS With the changing trend of ΔY, the magnetic integrated resonant coil L f1 The variation trend of the induced voltage with ΔX is as follows Figure 8 When the receiving end is not centered, the induced voltage of the detection coil is greater than 0V, and the inverter output voltage and the magnetic integrated resonant coil L are sampled at the same time. f1 The X-axis offset direction can be determined by calculating the phase difference of the induced voltage.

[0100] S4: System simulation and verification,In order to verify the stability and feasibility of the designed system, an EV-WPT system prototype is built, and its circuit structure is as follows Figure 1 The parameters of the system prototype are shown in Table 1, where phase is P and amplitude is A.

[0101] Table 1 Data collection of 6 test points

[0102]

[0103]

[0104] S4.1 Verification of receiving end position detection:

[0105] Verify the magnetic integrated resonant coil L at the rated transmission distance of 16cm f1 and signal receiving coil L DS Ability to detect receiver position offset.

[0106] First is the signal receiving coil L DS Detect the Y-axis deviation and sample the signal receiving coil L through the acquisition circuit DS The induced voltage is rectified and the voltage value is obtained. The induced voltage changes with the Y-axis offset as shown in the following figure. Figure 9 As shown, the judgment threshold is set to 0.5V. Under the set judgment threshold, the maximum offset of the Y axis is 2cm, which can be used to determine that the Y-axis direction correction of the coupling mechanism at the receiving end is completed.

[0107] Then the magnetic integrated resonant coil L f1 Detect the X-axis deviation for verification, and also sample the magnetic integrated resonant coil L through the sampling circuit. f1 The induced voltage is rectified and the voltage value is obtained. The induced voltage changes with the X-axis offset as shown in the following figure. Figure 10 As shown, the judgment threshold is set to 0.5V. Under the set judgment threshold, the maximum offset of the X-axis is 1.5cm, which can be used to determine that the X-axis direction correction of the coupling mechanism at the receiving end is completed.

[0108] Sampling inverter output voltage and magnetic integrated resonant coil L f1 Compare the induced voltages, calculate the phase difference and determine the X-axis offset direction. The phase difference comparison is as follows: Figure 11 As shown, when Δx>0, the magnetic integrated resonant coil L f1 The induced voltage phase is ahead of the inverter output voltage. When Δx<0, the magnetic integrated resonant coil L f1 The induced voltage phase lags behind the inverter output voltage. At different offset positions, the magnetic integrated resonant coil L f1 The induced voltage amplitude changes, but the phase difference with the inverter output voltage can still clearly reflect the offset direction of the X-axis. Figure 11 (a) is (Δx, Δy) = (100, 0), Figure 11 (b) is (Δx, Δy) = (-100, 0), Figure 11 (c) is (Δx, Δy) = (150, 100), Figure 11 (d) is (-150, 100).

[0109] S4.2 Verification of the system charging phase:

[0110] The 11kW high-power charging stage of the electric vehicle static wireless charging system was tested. The test conditions were that the transmission distance was 16cm when the primary and secondary coupling mechanisms were aligned. The DC input voltage was controlled to 700V by the charger. The inverter output voltage and current waveforms were observed. Figure 12 As shown in the figure, the current waveform lags slightly behind the voltage waveform, showing weak inductive properties, which helps reduce switching losses and ensures the long-term use of the inverter. The inverter output voltage is 700V and the inverter output current is 20.5A.

[0111] The power analyzer is used to sample and calculate the system output power and transmission efficiency. Figure 13 As shown in the figure, U dc1 is the DC input voltage, I dc1 is the DC input current, P1 is the DC input side power, U dc2 is the output voltage at the load end, I dc2 is the load output current, P2 is the system output power, and η1 is the calculated system transmission efficiency. The DC input power is 11.54 kW, the output power is 10.92 kW, and the system DC-DC transmission efficiency is 94.6%.

[0112] To verify the communication transmission rate, you can send a shared folder from the signal transmitter to the signal receiver, check the speed at which the computer transfers files to obtain the data transmission rate, and verify the accuracy of the data transmission by observing the IP address of the sender and the content of the source file. Figure 14 and Figure 15 The effect diagram of the signal transmission coil during signal transmission shown in the figure shows that when the primary and secondary side coupling mechanisms are aligned, the transmission rate reaches 3.1MB / s, which is about 24.8Mbps.

[0113] In summary, the simulation results of this application show that the receiving end position detection method can achieve the detection of Y-axis offset in the range of [-200mm, 200mm], the detection of X-axis offset in the range of [-150mm, 150mm], and the sampling magnetic integrated resonant coil L f1 By sensing the voltage and inverter output voltage and detecting the phase difference, the X-axis offset direction can be determined, achieving a large detection range and high alignment detection accuracy. High-power charging testing of the system at a rated transmission distance of 16 cm achieved an output power of 10.92kW and a DC-DC transmission efficiency of 94.6%. Furthermore, the separate signal transmission component designed in this application achieves a communication speed of 24.8Mbps when the coupling mechanisms at the receiving and transmitting ends are aligned.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A wireless charging system with position detection function, characterized in that: It includes an energy transmission component and a signal transmission component, wherein the energy transmission component includes a power transmission coil , power receiving coil and magnetic integrated resonant coil , the signal transmission component includes a signal transmitting coil and signal receiving coil ; The power transmitting coil , magnetic integrated resonant coil and signal transmitting coil The power receiving coil is stacked sequentially. and signal receiving coil The stacked arrangement, when detecting position, the magnetically integrated resonant coil and signal receiving coil The detection coils detect position deviations in the X and Y axes.

2. The wireless charging system with position detection function according to claim 1, characterized in that: The power transmitting coil and power receiving coil All are Q-type coils; The signal transmitting coil and signal receiving coil They are all DD type coils symmetrical along the X axis, and the magnetic integrated resonant coils It is a DD type coil that is symmetrical along the Y axis.

3. The wireless charging system with position detection function according to claim 1, characterized in that: The energy transmission component also includes a transmitting end transmission circuit and a receiving end transmission circuit; The transmitting end transmission circuit includes a DC power supply connected in sequence , an inverter circuit and a primary compensation circuit, the output end of the primary compensation circuit is connected to the power transmitting coil connect; The receiving end transmission circuit includes a secondary side compensation circuit and a rectifier filter circuit connected in sequence, and the input end of the secondary side compensation circuit is connected to the power receiving coil. , the output end of the rectifier filter circuit and the load connect.

4. The wireless charging system with position detection function according to claim 3, characterized in that: The primary side compensation circuit and the secondary side compensation circuit form an LCC-S resonant compensation network.

5. The wireless charging system with position detection function according to claim 4, characterized in that: The transmitting end transmission circuit also includes a circuit for controlling the magnetic integrated resonant coil A single-pole double-throw switch S connected to or disconnected from the primary compensation circuit; The input end of the single-pole double-throw switch S is connected to an output end of the inverter circuit, and a control end A of the single-pole double-throw switch S is connected to the magnetic integrated resonant coil. One end is connected to the other control end B of the single-pole double-throw switch S and the magnetic integrated resonant coil The other end of each is connected to an input end of the primary compensation circuit.

6. The wireless charging system with position detection function according to claim 5, characterized in that: During position detection, the input terminal S of the single-pole double-throw switch is connected to the control terminal B, and the magnetic integrated resonant coil The primary side compensation circuit is not connected; During wireless charging, the input terminal S of the single-pole double-throw switch is connected to the control terminal A, and the magnetic integrated resonant coil Connect to the primary side compensation circuit.

7. The wireless charging system with position detection function according to claim 1, characterized in that: The signal transmission component also includes a signal modulation circuit and a signal mediation and acquisition circuit; The output end of the signal modulation circuit is connected to the signal transmitting coil Connect the input end of the signal modulation and acquisition circuit to the signal receiving coil connect.

8. A method for adjusting the position of a wireless charging system with a position detection function, characterized in that: The method is used to adjust the position of the receiving end of the wireless charging system with position detection function according to claim 5 or 6, and the specific steps are: S1: Control the input terminal S of the single-pole double-throw switch to be connected to the control terminal B; S2: signal receiving coil The induced voltage is used to determine whether there is an offset in the Y-axis direction and adjust the position of the receiving end in the Y-axis direction; S3: Collecting magnetic integrated resonant coil The induced voltage and the phase difference with the inverter output voltage are used to determine whether there is an offset in the X-axis direction and adjust the position of the receiving end in the X-axis direction.

9. The method for adjusting the position of a wireless charging system with a position detection function according to claim 8, wherein: The specific method for adjusting the position of the receiving end in the Y-axis direction in step S2 is: If the signal receiving coil If the induced voltage is greater than 0, it is determined that the receiving end is offset in the Y-axis direction, and the position of the receiving end in the Y direction is adjusted, and the signal receiving coil is collected in real time. The induced voltage reaches the signal receiving coil When the induced voltage is equal to 0V, the Y-axis direction correction is completed.

10. The method for adjusting the position of a wireless charging system with a position detection function according to claim 8, wherein: The specific method for adjusting the position of the receiving end in the X-axis direction in step S3 is: If the magnetic integrated resonant coil When the induced voltage is greater than 0V, it is determined that the receiving end is offset in the X-axis direction, and the offset direction is determined based on the phase difference; According to the offset direction, adjust the X-direction position of the receiving end and collect the magnetic integrated resonant coil in real time. The induced voltage until the magnetic integrated resonant coil When the induced voltage is equal to 0V, the X-axis direction correction is completed.

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