A detection device and method for a wireless charging receiving end

Abstract

The present application relates to the field of electric bicycle wireless charging, and particularly relates to a detection device and method for a wireless charging receiving end, comprising a magnetic element module located in the wireless charging receiving end device and a magnetic force detection circuit module and a control module located in the wireless charging transmitting end; the present application places a small magnetic element module in the wireless charging receiving end device, sets a corresponding magnetic force detection circuit module in the wireless charging transmitting end, when the wireless charging receiving end device is placed, the magnetic force detection circuit module of the wireless charging transmitting end transmits the sensed magnetic field change signal to the control module, the control module immediately generates a corresponding action signal, and the charging process can be performed, the present application has the characteristics of fast charging start process, short user waiting time, good user experience and the like, does not need an additional communication module, has low cost, and has strong market competitive advantage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wireless charging of electric bicycles, and particularly relates to a detection device and method for a wireless charging receiving end. BACKGROUND

[0002] In order to eliminate fire hazards, the wireless charging form of electric bicycles is gradually popularized. The centralized management type wireless charging station is provided with a plurality of wireless charging transmitting ends, and the wireless charging receiving end of the electric bicycle owner can be placed on the transmitting end to charge. The wireless charging transmitting end and the receiving end are not one-to-one matched, so it is necessary to detect whether the wireless charging receiving end is placed on the transmitting end.

[0003] The common detection method at present is to add a communication function to the wireless charging transmitting end and the receiving end: the wireless charging transmitting end performs scanning type round-robin power supply, when the wireless charging receiving end is placed and the wireless charging transmitting end is powered at this moment, the wireless charging receiving end is powered, communication is established, and the charging process is performed.

[0004] However, in this process, affected by the scanning type round-robin power supply time of the transmitting end, the more the wireless charging transmitting ends of the wireless charging station, the longer the user waiting time, the poor user experience, the high cost of the communication module, and the weak market competitiveness of the wireless charging receiving end, so we need to propose a detection device and method for the wireless charging receiving end to solve the above problems, so that it can have the characteristics of fast charging start process, short user waiting time, good user experience, etc. without additional communication module, low cost, strong market competitive advantage. SUMMARY

[0005] In view of the above problems, the present application provides a detection device for a wireless charging receiving end, which comprises: a magnetic element module located in the wireless charging receiving end device, the magnetic element module has certain magnetic properties, when the magnetic element module is placed in the corresponding position near the wireless charging transmitting end, a magnetic field change that can be detected will be generated in the surrounding space;

[0006] A magnetic force detection circuit module and a control module located in the wireless charging transmitting end, the magnetic force detection circuit module detects the change of the surrounding magnetic field by using the principle of electromagnetic induction to judge whether the wireless charging receiving end device is close;

[0007] The control module receives the judgment result signal from the magnetic force detection circuit module, and controls the whole wireless charging process according to the judgment result signal, when receiving the signal indicating that the receiving end exists, according to the preset charging control logic, coordinates each related circuit and equipment to enter the charging process;

[0008] The control module is electrically connected with a magnetic force detection circuit module, and the magnetic force detection circuit is electrically connected with a magnetic element module.

[0009] Further, the magnetic element module comprises a small-sized magnetic element made of non-metallic material, the magnetic element is installed in the wireless charging receiving end device, and an insulating material is arranged between the magnetic element and the wireless charging receiving end device.

[0010] Further, the magnetic element is mainly made of ferrite material or ceramic magnetic material, wherein the ferrite material comprises manganese-zinc ferrite and nickel-zinc ferrite.

[0011] Further, the insulating material is one of polyimide film, epoxy resin and ABS engineering plastic, and the magnetic element and the wireless charging receiving end device are wrapped or separated by the insulating material.

[0012] Further, the magnetic force detection circuit module comprises an isolation optocoupler U1 and a magnetic force switch S1, one end of the magnetic force switch S1 is connected with one end of the resistance R1, the other end of the magnetic force switch S1 is connected with a VCC1 end for providing a VCC signal, a first filter circuit is connected between the magnetic force switch S1 and the resistance R1, one end of the first filter circuit is connected with a 2-pin of the isolation optocoupler U1, a second filter circuit is connected on a 3-pin of the isolation optocoupler U1, a VCC2 end is arranged on a 4-pin of the isolation optocoupler U1, the magnetic force switch S1 is closed when there is magnetic force, and the magnetic force switch S1 is opened when there is no magnetic force; the change of the surrounding magnetic field is detected through the magnetic force switch S1, so as to determine whether the wireless charging receiving end device is close.

[0013] Further, the first filter circuit comprises a resistance R2, a capacitor C1, a resistance R3 and a capacitor C2 connected in parallel, one of the resistance R2, the capacitor C1, the resistance R3 and the capacitor C2 is grounded, the other end of the resistance R2, the capacitor C1, the resistance R3 and the capacitor C2 is connected on the connection end of the magnetic force switch S1 and the resistance R1, and the capacitor C2 is located on one side of the isolation optocoupler U1, and the resistance R2 is located on one side of the magnetic force switch S1.

[0014] The second filter circuit comprises a resistance R4 and a capacitor C3 connected in parallel on the 3-pin of the isolation optocoupler U1, and the other connection end of the resistance R4 and the capacitor C3 is grounded.

[0015] Further, when there is no magnetic force, the magnetic switch S1 is in an open state, at this time the 1 pin of the isolation optocoupler U1 is pulled down to GND1 by the resistor R2 and the resistor R3, the isolation optocoupler U1 is in a power-off state, the isolation triode of the isolation optocoupler U1 is not conductive, the isolated magnetic force detection signal COIL1 is pulled down to GND2 by the resistor R4, indicating that no magnetic force is detected;

[0016] When there is magnetic force, the magnetic switch S1 is in a closed state, at this time the 1 pin of the isolation optocoupler U1 is made to have a forward high level by the magnetic switch S1 and the resistor R1, the isolation optocoupler U1 is in a power-on state, the isolation triode is conductive, and the isolated magnetic force detection signal COIL1 is pulled up to the VCC2 end, indicating that magnetic force is detected;

[0017] In the wireless charging station, whether the wireless charging receiving end device is placed is judged by detecting the state signal of COIL1, so as to perform a charging process.

[0018] Further, the VCC1 end and the VCC2 end are set as power supply, the magnetic switch S1 is isolated and powered by the VCC1 end and the VCC2 end, and the wireless charging station end should also monitor the voltage parameter and the current parameter of the wireless charging transmitting end.

[0019] Further, the control module performs wireless charging process control according to the judgment result signal of the magnetic force detection circuit module, and the process is as follows:

[0020] A1, receiving the magnetic force detection signal COIL1 output from the magnetic force detection circuit module through the signal input interface circuit, and performing preliminary processing on the received signal to convert the signal level into a range that can be recognized by the MCU;

[0021] A2, the MCU constantly monitors the level state of the input signal COIL1, and determines whether the wireless charging receiving end device is close according to the pre-set judgment logic, which has the following two cases:

[0022] A21, if COIL1=VCC2 high level, it is determined that the wireless charging receiving end device exists, and A3 is entered;

[0023] A22, if COIL1=GND2 low level, it is determined that there is no wireless charging receiving end device, and the detection continues, and no charging related operation is performed, and A2 is returned;

[0024] A3, according to the charging parameter configuration information stored in the storage unit in advance, a control instruction is sent to the power output circuit of the wireless charging through the charging control output interface circuit to start the charging process;

[0025] A4, the wireless charging receiving end device adopts constant voltage charging mode for charging, the MCU continuously monitors the actual output voltage and current, and adjusts and controls according to the deviation from the preset value, so as to ensure that the charging process is stable according to the set parameters;

[0026] The adjustment formula for adjusting and controlling according to the deviation from the preset value is as follows:

[0027] , wherein, is the control output, is the difference between the set voltage and the actual voltage, , and are the proportional coefficient, integral coefficient and differential coefficient respectively, is the time variable;A5, according to the charging time accumulation and the battery capacity estimation, it is judged whether the charging is completed, when the charging is not completed, return to A4, when the charging is completed, the MCU records the relevant information of this charging to the storage unit.

[0028] Based on the above description, a detection device for a wireless charging receiving end is provided, and a detection method for a wireless charging receiving end is also provided, comprising the following steps:

[0029] S1, the magnetic element module in the wireless charging receiving end device is placed in the corresponding position near the wireless charging transmitting end, and the magnetic element module utilizes its own magnetic property to generate a magnetic field change that can be detected in the surrounding space;

[0030] S2, the magnetic force detection circuit module in the wireless charging transmitting end detects the change of the surrounding magnetic field by using the principle of electromagnetic induction, and the magnetic force detection circuit module transmits the detected magnetic field change signal to the control module;

[0031] S3, the control module receives the judgment result signal from the magnetic force detection circuit module, and controls the whole wireless charging process according to these signals;

[0032] S31, when the signal indicating the existence of the wireless charging receiving end device is received, the control module coordinates each related circuit and device to enter the charging process according to the preset charging control logic;

[0033] S32, when the signal indicating that there is no wireless charging receiving end device is received, then return to S2.

[0034] The beneficial effects of the present application are:

[0035] This invention places a small magnetic component module inside the wireless charging receiver and a corresponding magnetic detection circuit module at the wireless charging transmitter. When a wireless charging receiver is placed, the magnetic detection circuit module at the wireless charging transmitter transmits the sensed magnetic field change signal to the control module. The control module immediately generates a corresponding action signal to initiate the charging process. This invention features fast charging start-up, short user waiting time, and a good user experience. It requires no additional communication module, has low cost, and has a strong competitive advantage in the market.

[0036] The magnetic component module of this invention uses non-metallic magnetic components, which can avoid the magnetic components being heated and damaged by the eddy current effect of the wireless charging coil. The magnetic component structure is small, saves space during installation, and is easy to assemble. Furthermore, the use of insulating materials can prevent the magnetic components from interfering with the wireless charging circuit, allowing the wireless charging circuit to work normally.

[0037] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A system block diagram of a detection apparatus according to an embodiment of the present invention is shown;

[0040] Figure 2 A circuit diagram of a magnetic force detection circuit module according to an embodiment of the present invention is shown;

[0041] Figure 3 A flowchart illustrating the wireless charging process control performed by the control module according to an embodiment of the present invention is shown.

[0042] Figure 4 A flowchart of a detection method according to an embodiment of the present invention is shown. Detailed Implementation

[0043] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] The embodiments of the present application provide a detection device for a wireless charging receiving end, as shown in the drawings, comprising a magnetic element module located in the wireless charging receiving end device and a magnetic force detection circuit module and a control module located in the wireless charging transmitting end, the control module is electrically connected with the magnetic force detection circuit module, and the magnetic force detection circuit is electrically connected with the magnetic element module. Figures 1-3

[0045] The magnetic element module has certain magnetic properties, and when the magnetic element module is placed at a corresponding position near the wireless charging transmitting end, a magnetic field change that can be detected is generated around the magnetic element module;

[0046] The magnetic element module comprises a small magnetic element made of non-metallic material, the magnetic element is installed inside the wireless charging receiving end device, and an insulating material is arranged between the magnetic element and the wireless charging receiving end device. By using the magnetic element made of non-metallic material, the magnetic element can be prevented from being damaged by the eddy current effect of the wireless charging coil. The magnetic element has a small structure and saves installation space, facilitating assembly. By using the insulating material, the magnetic element can be prevented from interfering with the wireless charging circuit, and the wireless charging circuit can work normally.

[0047] The magnetic element is mainly made of ferrite material or ceramic magnetic material. The ferrite material includes manganese-zinc ferrite and nickel-zinc ferrite. Ferrite is a commonly used non-metallic magnetic material, which has a relatively high resistivity, so that the eddy current loss generated in the alternating magnetic field is relatively small, which can effectively prevent excessive heating and damage caused by the eddy current effect of the wireless charging coil. The magnetic permeability of ferrite is also relatively appropriate, which can generate a magnetic field with sufficient intensity for the detected circuit to sense, and the cost is relatively low and easy to process.

[0048] The ceramic magnetic material has good non-metallic properties and suitable magnetism. They have good chemical stability, high temperature resistance and corrosion resistance, and can maintain their performance stability in complex wireless charging environments. They usually have high hardness and good mechanical properties, and are not easy to deform during use. In addition, the insulation performance is also excellent, which fundamentally avoids various interference problems caused by conduction.

[0049] ​The insulating material is one of polyimide film, epoxy resin and ABS engineering plastic, the polyimide film has excellent high-temperature resistance and can maintain good insulation performance, mechanical performance and chemical stability in a wide temperature range (generally from low temperature to several hundred degrees Celsius); in the wireless charging receiving end device, the polyimide film wraps the magnetic element, even if the internal temperature of the device rises during charging or in the case of long-term use and aging, it can still reliably isolate the magnetic element from the surrounding circuit, ensuring the normal operation of the wireless charging circuit, and its thinness will not significantly weaken or shield the magnetic field of the magnetic element, so that the magnetic force detection circuit can normally sense the magnetic field change generated by the magnetic element.

[0050] Epoxy resin is a common thermosetting insulating material, which has good adhesion and can be firmly attached to the surface of the magnetic element or filled in the gap between the magnetic element and other components, forming a hard and excellent insulating protective layer after curing; when used for the insulation of the magnetic element in the wireless charging receiving end device, the epoxy resin can effectively glue and insulate the magnetic element from the surrounding conductive parts, and can play a good role in some compact space, better fixing the position of the magnetic element and ensuring insulation, preventing interference caused by vibration, displacement and other factors, and ensuring the electrical safety of the entire wireless charging system.

[0051] ABS engineering plastic has good comprehensive performance, high hardness, toughness and dimensional stability, and is easy to process into various shapes of insulating isolation supports and other structures, which can provide a stable mounting position for the magnetic element and maintain a safe insulating distance between the magnetic element and the circuit, coil and other components in the wireless charging receiving end device, and can maintain good insulation and isolation effect even if the device is subjected to external impact or normal wear and tear during long-term use, ensuring the normal operation of the wireless charging and detection functions.

[0052] The magnetic element and the wireless charging receiving end device are provided with insulating materials in the form of overall wrapping or isolation support, wherein the overall wrapping is to wrap the magnetic element with insulating materials, like wearing a protective suit, for example, using insulating tape or sheet-shaped insulating materials (such as polyimide film), tightly wrapping or adhering to the outer surface of the magnetic element, ensuring that each surface is covered, so that the magnetic element is completely isolated from other conductive components, circuits and other components inside the wireless charging receiving end device, preventing the magnetic field from interfering with the circuit and avoiding the influence of the current in the circuit on the magnetic element:

[0053] The isolation support mode is that when the magnetic element has certain shape and installation position requirements, a special insulation isolation support is designed to place the magnetic element, such as an insulation plastic (such as ABS engineering plastic) made into a support conforming to the shape and size of the magnetic element, the support has a clamping groove or a fixing structure, the magnetic element is stably installed in the support, and then the support with the magnetic element is installed in a suitable position in the wireless charging receiving end device, so that the magnetic element and the surrounding circuit, coil and the like are kept at a sufficient safety distance, and the insulation and interference isolation effects are achieved.

[0054] The magnetic force detection circuit module detects the change of the surrounding magnetic field by using the electromagnetic induction principle to determine whether the wireless charging receiving end device is close.

[0055] As shown in Figure 2 The magnetic force detection circuit module includes an isolation optocoupler U1 and a magnetic switch S1, one end of the magnetic switch S1 is connected with one end of the resistor R1, the other end of the magnetic switch S1 is connected with a VCC1 end for providing a VCC signal, a first filter circuit is connected between the magnetic switch S1 and the resistor R1, one end of the first filter circuit is connected with the pin 2 of the isolation optocoupler U1, a second filter circuit is connected on the pin 3 of the isolation optocoupler U1, a VCC2 end is arranged on the pin 4 of the isolation optocoupler U1, the magnetic switch S1 is closed when there is a magnetic force, and the magnetic switch S1 is opened when there is no magnetic force; the change of the surrounding magnetic field is detected through the magnetic switch S1, so as to determine whether the wireless charging receiving end device is close.

[0056] The first filter circuit includes a resistor R2, a capacitor C1, a resistor R3 and a capacitor C2 connected in parallel, one of the resistor R2, the capacitor C1, the resistor R3 and the capacitor C2 is connected to ground, the other end of the resistor R2, the capacitor C1, the resistor R3 and the capacitor C2 is connected to the connection end of the magnetic switch S1 and the resistor R1, and the capacitor C2 is located on one side of the isolation optocoupler U1, and the resistor R2 is located on one side of the magnetic switch S1, the resistor R2, the capacitor C1, the resistor R3 and the capacitor C2 are used for signal filtering of the magnetic switch S1, and the accuracy of the magnetic switch S1 detection is improved.

[0057] The second filter circuit includes a resistor R4 and a capacitor C3 connected in parallel on the pin 3 of the isolation optocoupler U1, and the other connection end of the resistor R4 and the capacitor C3 is connected to ground, the capacitor C3 and the resistor R4 are used for filtering the detected signal after isolation, and the interference of the external detection signal is avoided.

[0058] When there is no magnetic force, the magnetic switch S1 is in an open state, at this time the 1 pin of the isolation optocoupler U1 is pulled down to GND1 by the resistors R2 and R3, the isolation optocoupler U1 is in a power-off state, the isolation triode of the isolation optocoupler U1 is not conductive, and the isolated magnetic force detection signal COIL1 is pulled down to GND2 by the resistor R4, indicating that no magnetic force is detected.

[0059] When there is no magnetic force, the magnetic switch S1 is in an open state, at this time the 1 pin of the isolation optocoupler U1 is pulled down to GND1 by the resistors R2 and R3, the isolation optocoupler U1 is in a power-off state, the isolation triode of the isolation optocoupler U1 is not conductive, and the isolated magnetic force detection signal COIL1 is pulled down to GND2 by the resistor R4, indicating that no magnetic force is detected.

[0060] In the wireless charging station, whether there is a wireless charging receiving end device is judged by detecting the state signal of COIL1, so as to carry out the charging process, and the organic combination of automatic detection and charging control is realized, and the convenience of charging is improved.

[0061] The VCC1 end and the VCC2 end are provided as power supplies, the magnetic switch S1 is isolatedly powered through the VCC1 end and the VCC2 end, interference of the magnetic switch S1 on the control module is avoided, the control module and the magnetic element module can work in a relatively independent and stable electrical environment, and the reliability of the entire detection device and the subsequent charging process control is guaranteed.

[0062] In order to avoid false detection caused by the magnetic element of the non-wireless charging receiving end device, the voltage parameter and the current parameter of the wireless charging transmitting end should also be monitored in the wireless charging station, and the monitoring process is as follows:

[0063] B1, voltage parameter monitoring, the voltage parameter monitoring method is as follows:

[0064] B11, using a voltage sensor or a voltage dividing circuit to measure the output voltage of the wireless charging transmitting end in real time;

[0065] B12, setting one or more voltage thresholds, when the measured voltage exceeds or is lower than the thresholds, triggering an alarm or stopping the charging process;

[0066] B13, monitoring the stability of the voltage, if the voltage fluctuation exceeds the normal range, it may indicate that there is an abnormal load or interference;

[0067] B2, current parameter monitoring, the current parameter monitoring method is as follows:

[0068] B21, using a current sensor or a series resistor to measure the output current of the wireless charging transmitting end in real time;

[0069] B22, set current threshold values, when the measured current exceeds these threshold values, indicating that the load is too heavy or there is a risk of short circuit, should trigger an alarm or stop charging;

[0070] B23, analyze the waveform of the current, a normal wireless charging process should have a stable current waveform, if the waveform is abnormal, it indicates that there is a problem with the wireless charging receiver or there is interference;

[0071] B3, combine the results of magnetic force detection with voltage and current monitoring results for comprehensive judgment, only when the magnetic force detection shows that there is a legal wireless charging receiver and the voltage and current parameters are within the normal range, the charging process is started;

[0072] B4, if any abnormality is detected, including high voltage, large current and abnormal waveform, the charging process should be stopped immediately, and an alarm or error prompt may be triggered;

[0073] B5, in-depth analysis of real-time measured voltage and current data to identify potential problems or abnormal situations;

[0074] B6, according to the analysis results, adaptively adjust the output power of the wireless charging transmitter to ensure the stability and safety of the charging process.

[0075] The control module receives the judgment result signal from the magnetic force detection circuit module, and controls the whole wireless charging process according to the judgment result signal. When receiving a signal indicating that a receiver exists, it will coordinate each related circuit and device to enter the charging process according to the preset charging control logic;

[0076] The control module includes an MCU, a signal input interface circuit, a charging control output interface circuit, and a storage unit. The MCU is electrically connected to the signal input interface circuit, the charging control output interface circuit, and the storage unit. The MCU is responsible for receiving the magnetic detection signal COIL1 from the magnetic detection circuit module, analyzing and processing the signal, and determining whether to start the charging process and subsequent control operations based on preset logic and programs. The signal input interface circuit is used to connect to the magnetic detection circuit module, receive the COIL1 signal, and perform appropriate level conversion and signal conditioning operations to ensure that it can be accurately recognized and processed by the MCU. To ensure the quality of the input signal, the charging control output interface circuit, after the MCU determines that a wireless charging receiver has been placed (i.e., receives the COIL1 signal indicating magnetic force), sends control commands to the wireless charging power output and other related circuits to initiate the charging process. This circuit controls the on / off state of the charging power and adjusts the charging voltage or current. The storage unit stores parameter settings related to wireless charging, such as charging power standards for different types of receivers, charging time limits, and records historical data during the charging process, such as the cumulative number of charging attempts and the duration of the last charging attempt, facilitating subsequent analysis and management of the charging status. The storage unit is configured with EEPROM, Flash, or other types of memory chips, with appropriate capacity and read / write speeds selected according to actual needs.

[0077] like Figure 3 As shown, the control module controls the wireless charging process based on the judgment result signal from the magnetic detection circuit module as follows:

[0078] A1. Receive the magnetic detection signal COIL1 output from the magnetic detection circuit module through the signal input interface circuit, and perform preliminary processing on the received signal, such as removing possible spike pulse interference (through capacitor filtering, etc.), and converting the signal level to a range that the MCU can recognize.

[0079] A2. The MCU continuously monitors the level of the input signal COIL1 and determines whether a wireless charging receiver is nearby according to the pre-set judgment logic. There are two possible scenarios:

[0080] A21. If COIL1 = VCC2 high level, it is determined that a wireless charging receiver device exists, and proceed to A3.

[0081] A22. If COIL1=GND2 is low, it is determined that there is no wireless charging receiver device. Continue to wait for detection, do not perform charging-related operations, and return to A2.

[0082] A3, according to the charging parameter configuration information stored in the storage unit in advance, the control instruction is sent to the wireless charging power output circuit through the charging control output interface circuit, to start the charging process;

[0083] A4, the wireless charging receiving end device adopts constant voltage charging mode for charging, the MCU continuously monitors the actual output voltage and current, and adjusts and controls according to the deviation from the preset value, so as to ensure that the charging process is stable according to the set parameters;

[0084] The adjustment formula for adjusting and controlling according to the deviation from the preset value is as follows:

[0085] , wherein, is the control output, is the difference between the set voltage and the actual voltage, , and are the proportional coefficient, integral coefficient and differential coefficient respectively is the time variable, and the output voltage and other charging parameters are quickly and accurately close to the set value by reasonably adjusting the , and coefficients, so as to realize stable charging;

[0086] A5, according to the charging time accumulation and the battery capacity estimation, it is judged whether the charging is completed, when the charging is not completed, return to A4, when the charging is completed, the MCU records the relevant information of this charging (such as charging start time, end time, total charging time, charging capacity, etc.) to the storage unit, which is convenient for subsequent query and statistical analysis of charging history data and other operations.

[0087] The application mainly aims at the centralized management type wireless charging station, and a small magnetic element module is placed in the wireless charging receiving end device, a magnetic force detection circuit module is arranged on the wireless charging transmitting end, when the wireless charging receiving end device is placed, the magnetic force detection circuit module of the wireless charging transmitting end transmits the sensed magnetic field change signal to the control module, the control module will immediately generate a corresponding action signal, that is, the charging process can be carried out. Compared with the common scanning type round-robin power supply scheme, the scheme provided by the application has the characteristics of fast charging starting process, short user waiting time, good user experience and the like, without additional communication module, the cost is low, and the application has strong market competitive advantage.

[0088] Based on the above description, a detection device for the wireless charging receiving end is provided, and a detection method for the wireless charging receiving end is provided, as shown in Figure 4 , comprising the following steps:

[0089] S1, the magnetic element module in the wireless charging receiving end device is placed to the corresponding position near the wireless charging transmitting end, the magnetic element module utilizes its own magnetic property to generate the magnetic field change which can be detected in the surrounding space;

[0090] S2, the magnetic force detection circuit module in the wireless charging transmitting end utilizes the electromagnetic induction principle to detect the change of the surrounding magnetic field, the magnetic force detection circuit module transmits the detected magnetic field change signal to the control module;

[0091] S3, the control module receives the judgment result signal from the magnetic force detection circuit module, and controls the whole wireless charging process according to the signal;

[0092] S31, when the signal indicating the existence of the wireless charging receiving end device is received, the control module coordinates each relevant circuit and device to enter the charging process according to the preset charging control logic;

[0093] S32, when the signal indicating the non-existence of the wireless charging receiving end device is received, the process returns to S2.

[0094] Although the present application is described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A detection device for a wireless charging receiver, characterized in that: include: The magnetic component module located inside the wireless charging receiver device utilizes its own magnetic properties. When the magnetic component module is placed at a corresponding position near the wireless charging transmitter, it will generate a detectable magnetic field change in the surrounding space. The magnetic detection circuit module and control module are located inside the wireless charging transmitter. The magnetic detection circuit module uses the principle of electromagnetic induction to detect changes in the surrounding magnetic field in order to determine whether a wireless charging receiver is nearby. The magnetic detection circuit module includes an isolation optocoupler U1 and a magnetic switch S1. A resistor R1 is connected to pin 1 of the isolation optocoupler U1. One end of the magnetic switch S1 is connected to one end of the resistor R1, and the other end of the magnetic switch S1 is connected to a VCC1 terminal for providing a VCC signal. A first filter circuit is connected between the magnetic switch S1 and the resistor R1. One end of the first filter circuit is connected to pin 2 of the isolation optocoupler U1. A second filter circuit is connected to pin 3 of the isolation optocoupler U1. A VCC2 terminal is provided on pin 4 of the isolation optocoupler U1. The magnetic switch S1 closes when there is magnetic force and opens when there is no magnetic force. The magnetic switch S1 detects changes in the surrounding magnetic field to determine if a wireless charging receiver is nearby. The first filter circuit includes a resistor R2, a capacitor C1, a resistor R3, and a capacitor C2 connected in parallel. One of the connection terminals of the resistor R2, capacitor C1, resistor R3, and capacitor C2 is grounded, and the other terminals of the resistor R2, capacitor C1, resistor R3, and capacitor C2 are all connected to the connection terminal of the magnetic switch S1 and the resistor R1. The capacitor C2 is located on one side of the isolation optocoupler U1, and the resistor R2 is located on one side of the magnetic switch S1. The second filter circuit includes a resistor R4 and a capacitor C3 connected in parallel on the pin of the isolation optocoupler U13, and the other connection terminal of the resistor R4 and the capacitor C3 is grounded; The control module receives the judgment result signal from the magnetic detection circuit module and controls the entire wireless charging process based on the judgment result signal. When a signal indicating the presence of a receiver is received, the module coordinates all relevant circuits and devices to enter the charging process according to the preset charging control logic. The control module is electrically connected to the magnetic force detection circuit module, and the magnetic force detection circuit is electrically connected to the magnetic element module.

2. The detection device for a wireless charging receiver according to claim 1, characterized in that: The magnetic element module includes a small non-metallic magnetic element, which is installed inside the wireless charging receiver device, and an insulating material is provided between the magnetic element and the wireless charging receiver device.

3. The detection device for a wireless charging receiver according to claim 2, characterized in that: The magnetic element is mainly made of ferrite material or ceramic magnetic material, wherein the ferrite material includes manganese zinc ferrite and nickel zinc ferrite.

4. The detection device for a wireless charging receiver according to claim 3, characterized in that: The insulating material is one of polyimide film, epoxy resin and ABS engineering plastic. The insulating material between the magnetic element and the wireless charging receiver is provided by either an overall wrapping method or an isolation bracket method.

5. The detection device for a wireless charging receiver according to claim 4, characterized in that: When there is no magnetic force, the magnetic switch S1 is in the open state. At this time, pin 1 of the isolation optocoupler U1 is pulled down to GND1 by the lower resistor R2 and the resistor R3. The isolation optocoupler U1 is in the de-energized state. The transistor of the isolation optocoupler U1 is not conducting. The isolated magnetic force detection signal COIL1 is pulled down to GND2 by the resistor R4, indicating that no magnetic force is detected. When there is magnetic force, the magnetic switch S1 is closed. At this time, the VCC1 terminal is connected to the magnetic switch S1 and the resistor R1 to make pin 1 of the isolation optocoupler U1 receive a positive high level. The isolation optocoupler U1 is energized, the isolation transistor is turned on, and the isolated magnetic force detection signal COIL1 is pulled up to the VCC2 terminal, indicating that magnetic force has been detected. Inside the wireless charging station, the presence of a wireless charging receiver is determined by detecting the status signal of COIL1, thereby initiating the charging process.

6. The detection device for a wireless charging receiver according to claim 5, characterized in that: The VCC1 and VCC2 terminals are configured as power supplies, providing isolated power to the magnetic switch S1 through the VCC1 and VCC2 terminals. The wireless charging station should also monitor the voltage and current parameters of the wireless charging transmitter.

7. The detection device for a wireless charging receiver according to claim 6, characterized in that: The control module controls the wireless charging process based on the judgment result signal from the magnetic force detection circuit module as follows: A1. Receive the magnetic detection signal COIL1 output from the magnetic detection circuit module through the signal input interface circuit, and perform preliminary processing on the received signal to convert the signal level into a range that the MCU can recognize. A2. The MCU continuously monitors the level of the input signal COIL1 and determines whether a wireless charging receiver is nearby according to the pre-set judgment logic. There are two possible scenarios: A21. If COIL1 = VCC2 high level, it is determined that a wireless charging receiver device exists, and proceed to A3. A22. If COIL1 = GND2 is low, it is determined that there is no wireless charging receiver device. Continue to wait for detection, do not perform charging-related operations, and return to A2. A3. Based on the pre-stored charging parameter configuration information in the storage unit, a control command is sent to the power output circuit of wireless charging through the charging control output interface circuit to start the charging process. A4. The wireless charging receiver uses a constant voltage charging mode for charging. The MCU continuously monitors the actual output voltage and current, and adjusts the control according to the deviation from the preset value to ensure that the charging process proceeds stably according to the set parameters. The adjustment formula for adjusting the control based on the deviation from the preset value is as follows: Where u(t) is the control output, e(t) is the difference between the set voltage and the actual voltage, and K... P K I and K D These are the proportional coefficient, integral coefficient, and differential coefficient, respectively, and dt is the time variable; A5. Based on the accumulated charging time and estimated battery power, determine whether charging is complete. If charging is not complete, return to A4. When charging is complete, the MCU records the relevant information of this charging in the storage unit.

8. A detection method for a wireless charging receiver, based on the detection device for a wireless charging receiver according to any one of claims 1-7, characterized in that: Includes the following steps: S1. Place the magnetic component module inside the wireless charging receiver at a corresponding position near the wireless charging transmitter. The magnetic component module uses its own magnetic properties to generate a detectable magnetic field change in the surrounding space. S2. The magnetic detection circuit module in the wireless charging transmitter uses the principle of electromagnetic induction to detect changes in the surrounding magnetic field. The magnetic detection circuit module transmits the detected magnetic field change signal to the control module. S3. The control module receives the judgment result signal from the magnetic force detection circuit module and controls the entire wireless charging process based on these signals. S31. When a signal indicating the presence of a wireless charging receiver is received, the control module coordinates all relevant circuits and devices to enter the charging process according to the preset charging control logic. S32. When a signal indicating that no wireless charging receiver is present is received, proceed with step S2.

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