Qi wireless charging automatic tracking alignment method and device

Abstract

The present invention provides a Qi wireless charging automatic tracking alignment method and device, comprising: before charging, locating the position of the mobile phone wireless charging RX coil through a 1MHz echo detection circuit, judging whether the mobile phone RX coil and the wireless charging TX coil are aligned according to the position, and if aligned, starting charging; otherwise, the wireless charging TX coil slides to the corresponding position, and starts charging after alignment; during the charging process, further monitoring the voltage balance state of the edge coil sensor in real time through a positioning detection circuit, thereby realizing the displacement correction alignment of the mobile phone RX coil and the wireless charging TX coil during charging, thereby improving the accuracy and charging efficiency of the mobile phone wireless charging, ensuring the stability of the mobile phone charging, and also ensuring high-power wireless charging.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a Qi wireless charging automatic tracking and alignment method and device. Background Art

[0002] The Qi standard wireless charging in the WPC (Wireless Power Consortium) is electromagnetic induction wireless charging, which requires the RX coil to be aligned with the TX coil as much as possible. Currently, three coils are commonly used in car wireless chargers in order to expand the charging area. As the charging power of mobile phones increases, the shortcomings of three coils are gradually exposed, that is, the magnetic field at the intersection of coils 1, 2, and 3 of the three coils is very weak, and high-power charging cannot be achieved at all. Some mobile phones cannot even be charged at the place where the coils overlap. In response to the above problems, Apple adopted a magnetic attraction alignment method to align the TX coil and the RX coil.

[0003] In addition, it is easy for a charging phone to shift while driving, and traditional wireless chargers cannot correct the alignment. Summary of the invention

[0004] In response to the above problems, this technology innovatively proposes a Qi wireless charging automatic tracking alignment method and device, by installing the PCB sensor coil board on the TX coil to slide with the TX coil, and setting a 1MHz echo detection circuit for the initial positioning of the mobile phone before charging. During charging, the real-time position correction and alignment is further achieved through the positioning detection circuit to ensure that the mobile phone RX coil is aligned with the wireless charging TX coil at all times, thereby ensuring that the mobile phone RX coil is continuously in a strong magnetic field, improving the efficiency of wireless charging and the stability of charging.

[0005] Specifically, the Qi wireless charging automatic tracking and alignment method described in the present invention includes the following steps:

[0006] S1: Before charging, turn on the 1MHz echo detection circuit to send electromagnetic energy to the coil sensor, and locate the initial position of the mobile phone wireless charging RX coil based on the detected echo of the 1MHz mobile phone RX coil;

[0007] S2: judging whether the mobile phone RX coil and the wireless charging TX coil are aligned according to the position where the echo occurs, and if so, charging starts; otherwise, the wireless charging TX coil slides to the corresponding position, and after alignment, charging starts, the 1MHz echo detection circuit is turned off, and the re-positioning detection circuit during charging is turned on;

[0008] S3: During charging, determine whether the wireless charging edge coil sensor is in a voltage balance state. If it is in a balance state, maintain the current position state; if the voltage value is unbalanced, the wireless charging TX coil slides from a high voltage to a low voltage until it is corrected and restored to a voltage balance state.

[0009] Among them, the TX coil is the coil of the wireless charger; the PCB sensor coil is a small coil sensor installed on the wireless charging TX coil, which can accurately detect the position of the Qi RX coil; the RX coil is the coil of the wireless charging receiving end; the RX receiving end is the Qi receiving end, preferably a wireless charging mobile phone with Qi standard; the echo is the 1MHz frequency returned by the wireless charger TX coil triggering the RX coil. Edge coil sensors, No. 1 and No. 3 are a group of edge coil sensors, and No. 4 and No. 5 are a group of edge coil sensors.

[0010] Furthermore, the coil sensor includes coil sensors No. 1 and No. 3 symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides.

[0011] The positioning of the mobile phone wireless charging RX coil also includes: calculating the 1 MHz echo frequency of the coil sensors No. 1, No. 2, No. 3, No. 4 and No. 5 respectively, and the location with the largest number of echoes is positioned as the mobile phone wireless charging RX coil.

[0012] Furthermore, if the echo occurs at any of coil sensors No. 1, 3, 4 or 5, the wireless charging TX coil slides toward that location until the coil sensor No. 2 is aligned with the mobile phone RX coil, and charging begins; if the echo occurs at coil sensor No. 2, there is no need to slide, and charging begins directly.

[0013] Wherein, the determining whether the wireless charging edge coil sensor is in a voltage balance state further includes:

[0014] When the voltage detected by any one of the coil sensors 1 and 3, or 4 and 5 is greater than the other side, the wireless charging TX coil moves to the side with a smaller voltage value until the voltage detected by any one side is equal to the other side, and the calibration is completed. During the entire calibration process, the mobile phone is in a normal charging state.

[0015] As another preferred embodiment, the present invention further provides a device for the Qi wireless charging automatic tracking and alignment method, comprising an upper cover and a base that cooperates with the upper cover to form a closed cavity. A Qi wireless charging automatic tracking unit is arranged in the cavity, comprising:

[0016] A PCB sensor coil board and a coil sensor arranged on the PCB sensor coil board.

[0017] The PCB sensor coil board, the wireless charging TX coil and the magnetic sheet disposed thereunder are stacked and fixed on the coil bracket by screws or adhesive.

[0018] The coil support cooperates with the slide groove and is used to slide according to the detection result of the 1MHz echo detection circuit or the positioning detection circuit.

[0019] The PCB sensor coil board is connected to the mainboard PCBA board through an FPC cable. The PCBA board controls the 1MHz echo detection circuit to emit electromagnetic energy to the coil sensor, and locates the initial position of the mobile phone wireless charging RX coil before charging according to the detected echo of the 1MHz mobile phone RX coil; and controls the re-positioning detection circuit during the charging process, which is used to detect the voltage balance state of the wireless charging edge coil sensor in real time during the charging process and perform corresponding corrections.

[0020] The coil sensors include coil sensors No. 1 and No. 3 symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides.

[0021] Furthermore, an opening is provided on the mainboard PCBA board, and a motor bracket is provided on the bottom plate, and the motor bracket fixes and supports the motor through the opening.

[0022] Furthermore, an air outlet is arranged on the base, and a fan is arranged below the air outlet.

[0023] Further, when not charging, the wireless charging TX coil stays at the center of the device.

[0024] In summary, the present invention provides a Qi wireless charging automatic tracking and alignment method and device, including: before charging, using a 1MHz echo detection circuit to locate the initial position of the mobile phone wireless charging RX coil, and judging whether the mobile phone RX coil and the wireless charging TX coil are aligned according to the position, and if aligned, charging starts; otherwise, the wireless charging TX coil slides to the corresponding position, and after alignment, charging starts; during the charging process, the detection circuit is further positioned again during the charging process to monitor the voltage balance state of the edge coil sensor in real time, thereby realizing the shift correction alignment of the mobile phone RX coil and the wireless charging TX coil during charging, thereby improving the accuracy and charging efficiency of the mobile phone wireless charging, ensuring the stability of the mobile phone charging, and also ensuring high-power wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of three coils in a commonly used in-vehicle wireless charger in the prior art.

[0026] Figure 2 This is a schematic diagram of a Qi wireless charging automatic tracking and alignment method described in the present invention.

[0027] Figure 3 for Figure 2 Schematic diagram of the detection results of the 1MHz echo detection circuit.

[0028] Figure 4 for Figure 2 Schematic diagram of the detection results of the corresponding positioning detection circuit of edge coil sensors No. 1 and No. 3 during the charging process.

[0029] Figure 5 This is a schematic structural diagram of a Qi wireless charging automatic tracking and alignment device described in the present invention. DETAILED DESCRIPTION

[0030] The following will further describe in detail a Qi wireless charging automatic tracking and alignment method and device of the present invention in conjunction with specific embodiments and drawings.

[0031] like Figure 1 As shown in the figure, the in-vehicle wireless charger in the prior art generally uses three coils in order to expand the charging area. However, the obvious defect of the three coils is that the magnetic field at the intersection of coils 1, 2, and 3 is very weak, and high-power charging cannot be achieved at all. Even some mobile phones cannot be charged at the intersection of the coils. The magnetic field distribution is shown in the figure, showing alternating strong and weak areas.

[0032] For this reason, Figure 2 As shown, the present invention provides a Qi wireless charging automatic tracking and alignment method, comprising the following steps:

[0033] S1: Before charging, turn on the 1MHz echo detection circuit to send electromagnetic energy to the coil sensor. The RX coil sensor is excited to generate an echo, which is amplified by the echo amplifier to obtain a 1MHz echo frequency result. According to the detected 1MHz mobile phone RX coil echo, the initial position of the mobile phone wireless charging RX coil is located.

[0034] The coil sensors include coil sensors No. 1 and No. 3 symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides.

[0035] The method of locating the position of the mobile phone wireless charging RX coil also includes: calculating the 1 MHz echo frequency of the coil sensors No. 1, No. 2, No. 3, No. 4 and No. 5 respectively, and locating the position with the largest number of echoes as the position of the mobile phone wireless charging RX coil. Preferably, as Figure 3 As shown, the detected 1MHz echo frequency is sorted from large to small as follows: No. 2, No. 3, No. 1, No. 4, No. 5, among which the 1MHz echoes of No. 4 and No. 5 are not shown, wherein No. 1 corresponds to the 1MHz echo of the No. 1 coil sensor, No. 2 corresponds to the 1MHz echo of the No. 2 coil sensor, and No. 3 corresponds to the 1MHz echo of the No. 3 coil sensor. When the mobile phone wireless charging RX coil is at the position of the No. 2 coil sensor, its corresponding 1MHz echo frequency reaches the strongest, while the No. 1 coil sensor and the No. 3 coil sensor are relatively weak, wherein the mobile phone wireless charging RX coil is slightly biased toward the No. 3 coil sensor, and it can be seen that the 1MHz echo of the No. 3 coil sensor is also slightly stronger than the frequency of the 1MHz echo of the No. 1 coil sensor. It can be seen that the more the mobile phone wireless charging RX coil is aligned with the wireless charging TX coil, the stronger the echo frequency is, thereby accurately obtaining the position information of the mobile phone wireless charging RX coil.

[0036] Specifically, the Qi standard has a "resonance echo" circuit at the RX end. By utilizing the "resonance echo" feature of the RX end, a circuit is designed on the wireless charger to excite the RX end, and the resonant echo of the RX end is detected at the same time, so that it can be accurately identified whether there is a Qi RX (wireless charging mobile phone) on the wireless charger. Among them, Ls is the receiving coil of the mobile phone end, and the entire LC circuit constitutes a resonant circuit. With the addition of an electromagnetic trigger energy, the LC circuit will generate a damped oscillation, fd=1000±100KHz.

[0037] S2: According to the location where the echo occurs, determine whether the mobile phone RX coil and the wireless charging TX coil are aligned. If aligned, charging starts; otherwise, the wireless charging TX coil slides to the corresponding position, and after alignment, charging starts, turning off the 1MHz echo detection circuit. Then turn on the re-positioning detection circuit during the charging process.

[0038] Specifically, if the echo occurs at any of the coil sensors No. 1, 3, 4 or 5, the wireless charging TX coil slides to that location until the coil sensor No. 2 is aligned with the mobile phone RX coil, and charging starts; otherwise, if the echo occurs at the coil sensor No. 2, there is no need to slide, and charging starts directly. Preferably, when not charging, the wireless charging TX coil slides to the center of the charger; when the No. 1 sensor detects the mobile phone RX, No. 2, 3, 4 and 5 are not detected, and the wireless charging TX coil slides directly to the direction of the No. 1 sensor, so that the mobile phone RX is charged first. When the No. 3 sensor detects the RX, No. 1, 2, 4 and 5 are not detected, and the wireless charging TX coil slides directly to No. 3, so that the mobile phone RX is charged first.

[0039] S3: During charging, determine whether the wireless charging edge coil sensor is in a voltage balance state. If it is in a balance state, maintain the current position state; if the voltage value is unbalanced, the wireless charging TX coil slides from a high voltage to a low voltage until it is corrected and restored to a voltage balance state.

[0040] Wherein, the determining whether the wireless charging TX coil is in a voltage balance state further includes:

[0041] When the voltage detected by any one of the coil sensors No. 1 and No. 3, or No. 4 and No. 5 is greater than the other side, the wireless charging TX coil moves to the side with a smaller voltage value until the voltage detected by any one side is equal to the other side, completing the calibration and alignment. The entire calibration process is to maintain the charging state. Figure 4 As shown, when the RX coil deflects toward sensor No. 1, the voltage sensed by sensor No. 1 will be higher than that of sensor No. 3. The voltage sensed by sensor No. 1 and sensor No. 3 is unbalanced, and the TX coil needs to move toward sensor No. 3. During the movement, as the RX coil continuously deflects back toward sensor No. 3, the voltage of sensor No. 3 will continue to increase, and the voltage on the corresponding sensor side of coil No. 1 will decrease until the two are equal and restored to a voltage balance state, completing the correction. Similarly, when an unbalanced state occurs again, repeat the above correction process. Sensors No. 4 and No. 5 are not shown in the figure, but the principle is the same.

[0042] As another preferred embodiment, the present invention also provides a device for the Qi wireless charging automatic tracking and alignment method as follows: Figure 5 As shown, 1-upper cover, 2-coil detection board, 3-wireless charging TX coil, 4-magnetic sheet, 5-FPC cable, 6-slide slot, 7-coil bracket, 8-screw, 9-motor, 10-motor bracket, 11-mainboard PCBA, 12-base, 13-fan.

[0043] Specifically, the device of the present invention includes an upper cover and a base that cooperates with the upper cover to form a closed cavity. A Qi wireless charging automatic tracking unit is arranged in the cavity, and further includes the following:

[0044] PCB sensor coil board, and a coil sensor arranged on the PCB sensor coil board; preferably, the bottom layer of the PCB sensor board also includes: the bottom layer surface is configured as a comb filter, an LED indicator light, an infrared LED position switch, a temperature sensor, and a socket for an FPC cable connected to a wireless charging mainboard, but not limited to this.

[0045] The PCB sensor coil board, the wireless charging TX coil and the magnetic sheet disposed thereunder are stacked and fixed on the coil bracket by screws or adhesive.

[0046] The coil support cooperates with the slide groove and is used to slide according to the detection result of the 1MHz echo detection circuit or the positioning detection circuit.

[0047] The PCB sensor coil board is connected to the mainboard PCBA board through an FPC cable. The PCBA board controls the 1MHz echo detection circuit to emit electromagnetic energy to the coil sensor, and locates the preliminary position of the mobile phone wireless charging RX coil according to the detected echo of the 1MHz mobile phone RX coil; and controls the positioning detection circuit to detect the voltage balance state of the wireless charging edge coil sensor in real time during the charging process, and perform corresponding corrections.

[0048] The coil sensors include coil sensors No. 1 and No. 3 symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides.

[0049] Furthermore, an opening is provided on the mainboard PCBA board, and a motor bracket is provided on the bottom plate, and the motor bracket fixes and supports the motor through the opening.

[0050] Furthermore, an air outlet is arranged on the base, and a fan is arranged below the air outlet.

[0051] Further, when not charging, the wireless charging TX coil stays at the center of the device.

[0052] In summary, the Qi wireless charging automatic tracking and alignment method and device described in the present invention not only effectively improves the efficiency and reliability of mobile phone wireless charging, but also realizes the intelligent real-time adjustment and correction alignment function, which can effectively solve the problem of displacement caused by vibration during driving, affecting the charging function, and further improves the efficiency and safety of mobile phone wireless charging.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A Qi wireless charging automatic tracking and alignment method, characterized in that: The following steps are involved: S1: Before charging, turn on the 1MHz echo detection circuit to send electromagnetic energy to the coil sensor, and locate the initial position of the mobile phone wireless charging RX coil based on the detected echo of the 1MHz mobile phone RX coil; S2: judging whether the mobile phone RX coil and the wireless charging TX coil are aligned according to the position where the echo occurs, and if so, charging starts; otherwise, the wireless charging TX coil slides to the corresponding position, and after alignment, charging starts, the 1MHz echo detection circuit is turned off, and the re-positioning detection circuit during the charging process is turned on; S3: During charging, determine whether the wireless charging edge coil sensor is in a voltage balance state, and if it is in a balance state, maintain the current position state; When the voltage value is unbalanced, the wireless charging TX coil slides from a high voltage to a low voltage until the voltage is corrected and restored to a balanced state; The coil sensor includes coil sensors No. 1 and No. 3, symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides; The positioning of the mobile phone wireless charging RX coil also includes: calculating the 1 MHz echo frequency of the coil sensors No. 1, No. 2, No. 3, No. 4 and No. 5 respectively, and the location with the largest number of echoes is positioned as the location of the mobile phone wireless charging RX coil; It also includes: If the echo occurs at any of coil sensors No. 1, 3, 4 or 5, the wireless charging TX coil slides toward that location until the coil sensor No. 2 is aligned with the mobile phone RX coil, and charging begins; otherwise, if the echo occurs at coil sensor No. 2, charging begins directly without sliding.

2. The Qi wireless charging automatic tracking and alignment method according to claim 1, characterized in that: The step of determining whether the wireless charging edge coil sensor is in a voltage balance state further includes: When the detected voltage value of any one side of coil sensors No. 1 and No. 3, or No. 4 and No. 5 is greater than the other side, the wireless charging TX coil moves to the side with a smaller voltage value until the detected voltage value of any one side is equal to the other side, and the calibration and alignment is completed. During the entire calibration and alignment process, the mobile phone is in a normal charging state.

3. A device for the Qi wireless charging automatic tracking and alignment method according to any one of claims 1 to 2, comprising an upper cover and a base that cooperates with the upper cover to form a closed cavity, characterized in that: A Qi wireless charging automatic tracking unit is arranged in the cavity, comprising: A PCB sensor coil board, and a coil sensor disposed on the PCB sensor coil board; and stacking and fixing the PCB sensor coil board, the wireless charging TX coil and the magnetic sheet disposed thereunder on the coil bracket by screws or adhesive; The coil support cooperates with the slide slot to slide according to the detection result of the 1MHz echo detection circuit or the positioning detection circuit; The PCB sensor coil board is connected to the PCBA board through the FPC cable. The PCBA board controls the 1MHz echo detection circuit to send electromagnetic energy to the coil sensor, and locates the initial position of the mobile phone wireless charging RX coil before charging according to the detected echo of the 1MHz mobile phone RX coil; And control the re-positioning detection circuit to detect the voltage balance state of the edge coil sensor in real time during the charging process and perform corresponding correction.

4. The device according to claim 3, characterized in that Also includes: The coil sensors include coil sensors No. 1 and No. 3 symmetrically distributed on the upper and lower sides of coil sensor No. 2, and coil sensors No. 4 and No. 5 on the left and right sides.

5. The device according to claim 4, characterized in that Also includes: An opening is arranged on the PCBA board, and a motor bracket is arranged on the bottom plate, and the motor bracket fixes and supports the motor through the opening.

6. The device according to claim 5, characterized in that Also includes: An air outlet is arranged on the base, and a fan is arranged below the air outlet.

7. The device according to claim 6, characterized in that Also includes: When not charging, the wireless charging TX coil stays in the center of the device.

Images