Device and processing method for improving foreign object detection sensitivity of wireless charging system in different application scenarios

Abstract

The application relates to a device for improving the foreign matter detection sensitivity of a wireless charging system in different application scenarios, wherein the device comprises a main control PWM processing module for performing frequency division processing to set the initial frequency of a switching signal; a driving circuit processing module for driving the switching signal to generate a driving signal; a coil measurement processing module comprising a back-to-back measurement coil group for improving the sensitivity of electromagnetic field detection by using an oscillation circuit generated by the measurement coil group; a measurement circuit processing module for measuring the voltage value of the driving signal in the current application scenario; and a main control ADC processing module for performing analog-digital state conversion on the driving signal. The application also relates to a corresponding processing method. The device and the processing method can measure the application scenarios of the wireless charging system in various different situations, and can improve the foreign matter detection sensitivity without sacrificing the compatibility of various occasions.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and more particularly to the field of foreign object sensitivity detection technology, specifically to a device and processing method for improving the foreign object detection sensitivity of wireless charging systems in different application scenarios. Background Technology

[0002] Currently, the wireless charging industry generally addresses this by increasing the distance between the transmitting coil and the bottom of the product, or by specifying its use in non-metallic application scenarios.

[0003] To ensure compatibility across various applications, current wireless charging systems lack sufficient measurement methods. While power (including current) from the transmitting coil can be measured, the presence of foreign objects can cause power loss that is identical to the surrounding environment, making it difficult for the wireless charging system to distinguish between the application environment and the foreign object. Furthermore, power loss efficiency compensation tables are difficult to create, effectively sacrificing the sensitivity of foreign object detection to achieve compatibility across multiple applications.

[0004] Raising the distance between the transmitting coil and the bottom of the product will limit its application scenarios. For example, a wireless charging system will not work if placed on a table, floor, or pipe with a metal bottom. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device and processing method for improving the foreign object detection sensitivity of wireless charging systems in different application scenarios, which can be compatible with multiple occasions without sacrificing the sensitivity of foreign object detection.

[0006] To achieve the above objectives, the present invention provides a device and processing method for improving the foreign object detection sensitivity of wireless charging systems in different application scenarios, as follows:

[0007] This device, designed to improve the foreign object detection sensitivity of wireless charging systems in different application scenarios, is characterized by comprising:

[0008] The main control PWM processing module is used to perform frequency division processing to set the initial frequency of the switching signal;

[0009] The drive circuit processing module is connected to the main control PWM processing module and is used to drive the switching signal to generate a drive signal.

[0010] The coil measurement processing module includes a back-to-back measurement coil group, and the coil measurement processing module is connected to the drive circuit processing module to improve the sensitivity of electromagnetic field detection by utilizing the oscillation circuit generated by the measurement coil group.

[0011] A measurement circuit processing module, connected to the coil measurement processing module, is used to measure the voltage value of the drive signal in the current application scenario; and

[0012] The main control ADC processing module is connected to the measurement circuit processing module and is used to perform analog-to-digital conversion on the drive signal.

[0013] Preferably, the back-to-back measuring coil assembly includes: a power transmission coil, a magnetic shielding sheet, and a measuring coil, wherein,

[0014] The magnetic shielding sheet is disposed between the power transmission coil and the measuring coil.

[0015] Preferably, the measurement circuit processing module includes a first probe, wherein,

[0016] The first end of the first probe is grounded through the third capacitor, and the first end of the first probe is also connected to the main control ADC processing module. The second end of the first probe is grounded through the third resistor and the second capacitor in sequence.

[0017] Furthermore, the negative terminal of the first diode is grounded through the second resistor and the second capacitor in sequence.

[0018] Preferably, the coil measurement processing module includes a second probe, wherein,

[0019] The driving signal generated by the driving circuit processing module is grounded sequentially through the second probe, the first capacitor, the first inductor, and the first resistor.

[0020] The method for improving the foreign object detection sensitivity of wireless charging systems in different application scenarios using the aforementioned device is characterized by the following steps:

[0021] (1) Using the main control PWM processing module, set the initial PWM frequency of the switching signal;

[0022] (2) The drive circuit processing module drives the switch signal to generate a drive signal;

[0023] (3) Measure and judge the voltage value of the driving signal in the current application scenario using the coil measurement and processing module;

[0024] (4) If the voltage value of the current driving signal is greater than the initial voltage, the original foreign matter efficiency compensation table is maintained to detect foreign matter sensitivity, and the following steps (6) are continued; otherwise, the following steps (5) are continued.

[0025] (5) Adjust the current foreign matter efficiency compensation table to match the voltage value of the driving signal in the current application scenario;

[0026] (6) Turn off the main control PWM processing module and set the wireless charging system to enter the wireless charging working mode.

[0027] The present invention relates to a device and method for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios. This method utilizes a suitable oscillation circuit composed of a group or a single coil, a PCB-board inductor, or an FPC-board inductor facing back-to-back with the transmitting coil at the bottom of the product, and a suitable resonant capacitor. Furthermore, based on the sensitivity value obtained under the current measurement environment, the corresponding foreign object efficiency compensation table can be adjusted in real time. Therefore, it is applicable to various applications without sacrificing the foreign object detection sensitivity, and has no limitations or constraints, thus possessing a wide range of applications. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall framework of the device for improving the sensitivity of foreign object detection in wireless charging systems under different application scenarios according to the present invention.

[0029] Figure 2a This is a top view of the measuring coil assembly of the present invention.

[0030] Figure 2b This is a bottom view of the measuring coil assembly of the present invention.

[0031] Figure 2c This is a schematic diagram of the left-side structure of the measuring coil assembly of the present invention.

[0032] Figure 2d This is a right-side view of the measuring coil assembly of the present invention.

[0033] Figure 3 This is a schematic diagram of the circuit structure of the measurement circuit processing module and the coil measurement processing module of the present invention in a first embodiment.

[0034] Figure 4 This is a schematic diagram of the circuit structure of the measurement circuit processing module and the coil measurement processing module of the present invention in a second embodiment.

[0035] Figure 5 The flowchart illustrates a processing method for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios, as described in this invention. Detailed Implementation

[0036] To more clearly describe the technical content of the present invention, the following description is provided in conjunction with specific embodiments.

[0037] Before detailing embodiments of the invention, it should be noted that, hereinafter, relational terms such as "first" and "second" are used merely to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between such entities or actions. The terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, thereby causing a process, method, article, or apparatus that comprises a list of elements to include not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0038] Please see Figure 1 As shown, this device improves the foreign object detection sensitivity of wireless charging systems in different application scenarios, wherein the device includes:

[0039] The main control PWM processing module is used to perform frequency division processing to set the initial frequency of the switching signal;

[0040] The drive circuit processing module is connected to the main control PWM processing module and is used to drive the switching signal to generate a drive signal.

[0041] The coil measurement processing module includes a back-to-back measurement coil group, and the coil measurement processing module is connected to the drive circuit processing module to improve the sensitivity of electromagnetic field detection by utilizing the oscillation circuit generated by the measurement coil group.

[0042] Please see Figures 2a to 2d As shown, the back-to-back measuring coil group includes: a power transmission coil, a magnetic shielding sheet, and a measuring coil. The power transmission coil is defined as the top layer, and a back-to-back measuring coil is added to the bottom layer. The magnetic shielding sheet is disposed between the power transmission coil and the measuring coil.

[0043] The aforementioned magnetic shielding sheet concentrates the magnetic field in a specific direction to detect the environment, thereby improving the sensitivity of electromagnetic field detection.

[0044] In one specific embodiment of the present invention, the detection direction of the measuring coil group can be adjusted according to the actual situation to adapt to the current detection environment.

[0045] In one specific embodiment of the present invention, the measuring coil may also be any similar component that generates electromagnetic induction, such as a PCB board inductor or an FPC board inductor.

[0046] A measurement circuit processing module, connected to the coil measurement processing module, is used to measure the voltage value of the drive signal in the current application scenario; and

[0047] The main control ADC processing module is connected to the measurement circuit processing module and is used to perform analog-to-digital conversion on the drive signal.

[0048] Please see Figure 3 and Figure 4 As shown, the measurement circuit processing module includes a first probe and uses the Pulse_Voltage device in Multisim to represent the drive signal in the illustration.

[0049] The first end of the first probe is grounded through the third capacitor C3, and the first end of the first probe is also connected to the main control ADC processing module. The second end of the first probe is grounded through the third resistor R3 and the second capacitor C2 in sequence.

[0050] Furthermore, the negative terminal of the first diode D1 is grounded through the second resistor R2 and the second capacitor C2 in sequence.

[0051] The coil measurement and processing module includes a second probe, wherein,

[0052] The driving signal generated by the driving circuit processing module is grounded sequentially through the second probe, the first capacitor C1, the first inductor L1, and the first resistor R1.

[0053] In one specific embodiment of the present invention, when metal is inserted into the test coil, the resistance of the first resistor R1 in the coil measurement and processing module increases, while the inductance of the first inductor L1 decreases. This is to detect whether the current application scenario causes a change in foreign object sensitivity, and thus adaptively adjust the foreign object efficiency compensation table.

[0054] This foreign object efficiency compensation table contains adjustment parameters pre-existing in the system based on different application environments. It adds loss factors according to different environments to ensure that the sensitivity of foreign object detection is not reduced.

[0055] In one specific embodiment of the present invention, a detection coil added to the back of the measuring coil group is used to detect if the current environment is non-metallic, and its efficiency is 1 without any adjustment. If the current environment is detected to be ferrous metal, the efficiency needs to be discounted by 95%, that is, 1 × 0.95. Among them, 5% of the loss is used by the detection coil to inform the power transmission coil that there is a 5% loss, which needs to be compensated to avoid false triggering.

[0056] In one specific embodiment of the present invention, if the current environment is detected to be stainless steel or any other metal that produces iron loss or efficiency loss, only a measurement needs to be performed at the beginning, and the power transmission coil can be informed to complete the signal compensation, thereby making it compatible with a variety of application environments.

[0057] Please see Figure 5 As shown, in a preferred embodiment of the present invention, the method for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios using the above-described device includes the following steps:

[0058] (1) First, using the main control PWM processing module, set the initial PWM frequency of the switching signal;

[0059] (2) The drive circuit processing module drives the switch signal to generate a drive signal;

[0060] (3) Measure and judge the voltage value of the driving signal in the current application scenario using the coil measurement and processing module;

[0061] (4) If the voltage value of the current driving signal is greater than the initial voltage under the premise that the initial voltage is non-metallic, the original foreign matter efficiency compensation table is maintained to detect the foreign matter sensitivity, and the following steps (6) are continued; otherwise, the following steps (5) are continued.

[0062] (5) Adjust the current foreign matter efficiency compensation table to match the voltage value of the driving signal in the current application scenario;

[0063] (6) Turn off the main control PWM processing module and set the wireless charging system to enter the wireless charging working mode.

[0064] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0065] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution device.

[0066] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0067] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," "implementation," or "embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0069] The present invention relates to a device and method for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios. This method utilizes a suitable oscillation circuit composed of a group or a single coil, a PCB-board inductor, or an FPC-board inductor facing back-to-back with the transmitting coil at the bottom of the product, and a suitable resonant capacitor. Furthermore, based on the sensitivity value obtained under the current measurement environment, the corresponding foreign object efficiency compensation table can be adjusted in real time. Therefore, it is applicable to various applications without sacrificing the foreign object detection sensitivity, and has no limitations or constraints, thus possessing a wide range of applications.

[0070] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A device for improving the foreign object detection sensitivity of wireless charging systems in different application scenarios, characterized in that, The device includes: The main control PWM processing module is used to perform frequency division processing to set the initial frequency of the switching signal; The drive circuit processing module is connected to the main control PWM processing module and is used to drive the switching signal to generate a drive signal. The coil measurement processing module includes a back-to-back measurement coil group, and the coil measurement processing module is connected to the drive circuit processing module to improve the sensitivity of electromagnetic field detection by utilizing the oscillation circuit generated by the measurement coil group. The measurement circuit processing module, connected to the coil measurement processing module, is used to measure the voltage value of the driving signal in the current application scenario. If the current driving signal voltage value is greater than the initial voltage, the original foreign object efficiency compensation table is maintained for foreign object sensitivity detection, while the main control PWM processing module is turned off, and the wireless charging system is set to enter wireless charging working mode; otherwise, the current foreign object efficiency compensation table is adjusted to adapt to the voltage value of the driving signal in the current application scenario; and The main control ADC processing module is connected to the measurement circuit processing module and is used to perform analog-to-digital conversion on the drive signal.

2. The device for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios according to claim 1, characterized in that, The back-to-back measuring coil assembly includes: a power transmission coil, a magnetic shielding sheet, and a measuring coil, wherein, The magnetic shielding sheet is disposed between the power transmission coil and the measuring coil.

3. The device for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios according to claim 1, characterized in that, The measurement circuit processing module includes a first probe, wherein, The first end of the first probe is grounded through the third capacitor (C3), and the first end of the first probe is also connected to the main control ADC processing module. The second end of the first probe is grounded through the third resistor (R3) and the second capacitor (C2) in sequence. The negative terminal of the first diode (D1) is grounded through the second resistor (R2) and the second capacitor (C2) in sequence.

4. The device for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios according to claim 3, characterized in that, The coil measurement and processing module includes a second probe, wherein, The driving signal generated by the driving circuit processing module is grounded sequentially through the second probe, the first capacitor (C1), the first inductor (L1), and the first resistor (R1).

5. A method for improving the foreign object detection sensitivity of a wireless charging system in different application scenarios using the apparatus of any one of claims 1 to 4, characterized in that, The method includes the following steps: (1) Using the main control PWM processing module, set the initial PWM frequency of the switching signal; (2) The driving circuit processing module drives the switching signal to generate a driving signal; (3) Measure the voltage value of the driving signal in the current application scenario using the coil measurement and processing module and make a judgment on it; (4) If the voltage value of the current driving signal is greater than the initial voltage, the original foreign matter efficiency compensation table is maintained to detect foreign matter sensitivity, and the following steps (6) are continued; otherwise, the following steps (5) are continued. (5) Adjust the current foreign object efficiency compensation table to match the voltage value of the driving signal in the current application scenario; (6) Turn off the main control PWM processing module and set the wireless charging system to enter the wireless charging working mode.

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