A microprocessor intelligent control combined device of wireless charging and receiving load

Abstract

The utility model discloses a kind of wireless charging and receiving load combination devices of microprocessor intelligent control, including sending end circuit and receiving end circuit, the sending end circuit includes main switch and resonance circuit, MCU main control unit and peripheral circuit, the main switch and resonance circuit include main switch tube, main resonant element and fine tuning resonant element, adopt MCU main control unit control the on-off combination of auxiliary switch tube, make main resonant element and fine tuning resonant element selectively parallel, realize that resonant frequency is periodically dithered on adjacent frequency point and / or select one of different resonant frequency point continuous work;Different load, the resonant voltage / current-frequency characteristic curve of various conventional material operation platform is stored simultaneously, and effective load is automatically identified by scanning comparison;With compatible multiple load, steady flow high efficiency, reduce capacity, adaptive flexible, competitive advantage beneficial effect.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and in particular to a combination device for wireless charging and receiving load intelligently controlled by a microprocessor. Background Technology

[0002] As people's living standards improve, portable electronic products with built-in rechargeable batteries (such as mobile phones, Bluetooth headsets, electric toothbrushes, and shavers) are becoming increasingly popular. Considering the convenience of charging methods and environmental conditions, these products need to meet certain levels of waterproofing and dustproofing requirements. Wireless charging, based on the principle of near-field electromagnetic coupling, allows charging to be achieved without direct electrical contact between the charger and the receiving circuit. Therefore, wireless chargers are gaining widespread use in these applications.

[0003] Existing wireless chargers use a combination of dedicated integrated circuits (ASICs) or common operational amplifiers, comparators, and discrete components to achieve wireless charging functionality. They rely on simple control logic or fixed-function designs, lacking intelligent analysis and programmability. This makes it difficult to flexibly adapt to the charging needs of different devices (such as mobile phones, watches, and headphones) or to achieve personalized functions (such as dynamic power adjustment, multi-device identification, and customized charging protection). Functional homogenization is severe. Distributed control or multi-module designs require numerous external components (such as independent timing chips, protection circuits, and logic control modules), resulting in complex circuit structures, high redundancy, and larger PCB sizes. This hinders miniaturization and thinner designs, limiting application scenarios (such as portable devices and embedded charging modules). Relying on ASICs or imported control chips results in fixed functions, high customization costs, and increased procurement costs and supply chain risks (such as shortages and price increases) for imported chips, making them less cost-effective than using domestically produced MCUs. The proposed solution lacks market competitiveness; it lacks a core intelligent control unit, or the control chip has limited computing, storage, and logic processing capabilities, making it difficult to achieve complex functions (such as dynamic power adjustment, real-time foreign object detection, temperature closed-loop control, and charging efficiency optimization), and may have problems such as low charging efficiency and insufficient safety (such as lagging over-temperature and over-current protection). Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, this utility model provides a combination device for wireless charging and receiving load with microprocessor intelligent control, which is used to solve the technical problems of existing wireless chargers, such as poor functional flexibility, complex circuit structure and difficulty in miniaturization, high cost and low cost-effectiveness, and weak intelligent control and complex function implementation capabilities.

[0005] A combination device for wireless charging and receiving loads with microprocessor intelligent control includes a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency dithering control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectifier and filter circuit and a CC / CV charging control switch circuit. The main switch and resonant circuit includes a main switch transistor, a main resonant element, and a fine-tuning resonant element. By controlling the on / off combination of the auxiliary switch transistor, the capacitance of the resonant capacitor or the inductance of the main switch and resonant circuit is adjusted, so that the main switch and resonant circuit dithers at adjacent resonant frequency points to achieve energy dispersion of the resonant spectrum, or selects to work continuously at one of the different resonant frequency points, or a combination of the above two modes, to achieve compatible charging of loads with various preset resonant frequency characteristics.

[0006] Preferably, the MCU main control unit and the MCU main control unit of the peripheral circuit emit PWM signals with specific frequencies and duty cycles to directly drive or drive the main switch and resonant circuit through the drive circuit.

[0007] Preferably, the MCU main control unit performs analog-to-digital conversion analysis on the resonant voltage and resonant current of the resonant voltage sampling circuit and the resonant current sampling circuit to obtain the working status of the main switch and the resonant circuit, and enters the processing mode corresponding to the working status.

[0008] Preferably, the MCU main control unit performs analog-to-digital conversion analysis on the curve relationship between the resonant voltage and the resonant current and different PWM control frequencies to determine whether there is a load with the corresponding resonant frequency in the receiving circuit. If not, it maintains a low-power standby mode; if so, it enters a charging mode.

[0009] Preferably, after entering the charging mode, the MCU main control unit acquires the status of the resonant voltage and the resonant current in real time, and adjusts the PWM control frequency in real time so that the PWM control frequency is close to or deviates from the inherent resonant frequency of the main switch and the resonant circuit, thereby changing the resonant strength of the main switch and the resonant circuit. This adjusts the power of the resonant circuit of the receiving end circuit and the battery charging current of the CC / CV charging control switch circuit, so that the battery is charged in constant current mode, and the charging current remains relatively stable even if the battery voltage continues to rise.

[0010] Preferably, the MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current under no-load and specific effective receiving loads with different PWM control frequencies. In actual use after leaving the factory, the characteristic curves of the resonant voltage and resonant current of the receiving circuit with the corresponding different PWM control frequencies are scanned within a certain frequency range and compared with the stored data. When a specific effective receiving load is placed, it can automatically identify and charge normally; when there is no specific effective receiving load, the control circuit maintains a low-power standby mode.

[0011] Preferably, the MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current of the unloaded and specific effective receiving loads on ordinary wooden, iron, aluminum alloy, and stainless steel operating surfaces, as well as the characteristic curves of different PWM control frequencies. In actual use after leaving the factory, even on a metal operating surface, the transmitting circuit can analyze and compare the data by scanning and storing the resonant voltage and resonant current of the receiving circuit with the corresponding characteristic curves of different PWM control frequencies within a certain frequency range. When a specific effective receiving load is placed, it can automatically identify and charge normally; when there is an invalid receiving load (such as ferrous metal), the control circuit maintains a low-power standby mode.

[0012] Preferably, the resonant frequency jitter control circuit and the resonant frequency switching control circuit enable the MCU main control unit to periodically control or continuously and stably control the switching on and off of one or more auxiliary switching transistors, so that the fine-tuning resonant element corresponding to the auxiliary switching transistor is connected in parallel or not in parallel with the main resonant element, for adjusting the resonant frequency of the main switch and the resonant circuit.

[0013] Preferably, the resonant voltage sampling circuit samples, rectifies, filters, and divides the resonant voltage of the resonant element, and then sends it to one of the ADC input ports of the MCU main control unit; the resonant current sampling circuit samples and filters the current of the resonant circuit and then sends it to one of the ADC input ports of the MCU main control unit; the receiving circuit uses specific resonant LC parameters, and the resonant inductance coupling of the receiving circuit converts the near-field magnetic field energy from the resonant inductor in the transmitting circuit into electrical energy, which is then used to charge the rechargeable battery after passing through the rectifier and filter circuit and the CC / CV charging control switch circuit.

[0014] This utility model discloses another combination device for wireless charging and receiving loads controlled by a microprocessor, including a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and a resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency jitter control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectifier filter circuit and a CC / CV charging control switch circuit. The MCU main control unit and the peripheral circuit's MCU main control unit emit a PWM signal with a specific frequency and duty cycle, which directly drives or drives the main switch and resonant circuit through a drive circuit. The frequency of the PWM signal cycles between two (or more) main frequency points to achieve energy dispersion of the resonant spectrum, thereby improving the conducted EMI (electromagnetic interference) performance of the resonant circuit. This makes the entire system more likely to meet the corresponding EMI regulations, eliminates the need for bulky EMI filter circuits, and simultaneously achieves compatible charging of loads with different resonant frequency characteristics.

[0015] Compared with the prior art, the beneficial effects obtained by this utility model are:

[0016] This utility model discloses a combination device for wireless charging and receiving loads controlled by a microprocessor, including a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and resonant circuit, an MCU main control unit, and peripheral circuits. The main switch and resonant circuit includes a main switching transistor, a main resonant element, and a fine-tuning resonant element. The MCU main control unit controls the switching of the auxiliary switching transistor, allowing the main resonant element and the fine-tuning resonant element to be selectively connected in parallel. This enables the resonant frequency to periodically fluctuate at adjacent frequency points, or to operate continuously at one of different resonant frequency points, or a combination of both modes. Simultaneously, it stores the resonant voltage / current-frequency characteristic curves of different loads and various conventional material operating surfaces, automatically identifying the effective load through scanning and comparison. This solves the problem of… Traditional wireless chargers struggle to be compatible with loads of different resonant frequency characteristics, often leading to charging failures due to load mismatch. Resonant circuits, by concentrating spectral energy, are prone to generating strong electromagnetic interference (EMI), requiring bulky filtering circuits and increasing cost and size. Furthermore, they are susceptible to misjudging loads or triggering ineffective operation in complex environments such as metal work surfaces. This new charger offers compatible charging for loads with multiple preset resonant frequencies, adapting to various loads with different resonant frequency characteristics. It improves EMI performance by dispersing spectral energy, meeting regulatory requirements without the need for bulky filtering circuits, thus reducing cost and size. It also accurately identifies effective loads in complex environments such as metal work surfaces, maintaining low-power standby when encountering ineffective loads (such as ferrous metals), enhancing both safety and energy efficiency.

[0017] The MCU main control unit acquires voltage and current signals in real time through resonant voltage sampling circuits and resonant current sampling circuits, and analyzes the working status of the analog-to-digital conversion circuit. Based on the analysis results, it dynamically adjusts the PWM control frequency to make the frequency approach or deviate from the inherent resonant frequency to change the resonant intensity, thereby achieving constant current charging control. The built-in storage module records the load characteristic curve and supports intelligent switching between standby and charging modes. This solves the technical problems of traditional wireless chargers, such as the lack of precise feedback control, the current fluctuation with the rise of battery voltage during constant current charging, and poor charging stability. It also addresses the issues of relying on fixed logic control, making it difficult to achieve complex intelligent analysis, lagging load identification, untimely mode switching, and inefficient charging or false triggering. The MCU features relatively stable charging current in constant current mode, maintaining current stability even when the battery voltage rises, thus improving charging efficiency and safety. Through real-time voltage / current analysis and dynamic frequency adjustment, it achieves intelligent load identification and automatic mode switching (standby / charging) with fast response speed. It also reduces reliance on external components, simplifies the circuit structure, reduces PCB size, and contributes to product miniaturization.

[0018] By adopting domestically produced MCUs to replace application-specific integrated circuits (ASICs), this technology leverages the timing, storage, logic operation, and high-speed computing capabilities of domestically produced MCU main control units to integrate functions such as PWM driving, analog-to-digital conversion, and frequency control. This replaces the fixed-function ASICs, solving the technical problems of traditional wireless chargers that rely on ASICs or imported chips, resulting in fixed functions that are difficult to adapt to differentiated needs, high procurement costs, significant supply chain risks, and limitations on personalized function expansion. This technology can meet users' differentiated functional requirements (such as customized charging protection strategies and multi-device adaptation logic), significantly improving functional flexibility. Furthermore, the high cost-effectiveness of domestically produced MCUs reduces overall hardware costs and the number of external components, further compressing costs and size, and enhancing the product's market competitiveness. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This invention relates to a schematic diagram of the transmitting end circuit of a combined device for wireless charging and receiving loads controlled by a microprocessor.

[0021] Figure 2 This invention relates to a schematic diagram of the receiver circuit of a combined device for wireless charging and receiving load controlled by a microprocessor.

[0022] Figure labels: 1-Main switch and resonant circuit; 2-MCU main control unit and peripheral circuit; 3-Resonant voltage sampling circuit; 4-Resonant current sampling circuit; 5-Resonant frequency jitter control circuit; 6-Resonant frequency switching control circuit. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] A combination device for wireless charging and receiving loads with microprocessor intelligent control includes a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency dithering control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectifier and filter circuit and a CC / CV charging control switch circuit. The main switch and resonant circuit includes a main switch transistor, a main resonant element, and a fine-tuning resonant element. By controlling the on / off combination of the auxiliary switch transistor, the capacitance of the resonant capacitor or the inductance of the main switch and resonant circuit is adjusted, so that the main switch and resonant circuit dithers at adjacent resonant frequency points to achieve energy dispersion of the resonant spectrum, or selects to work continuously at one of the different resonant frequency points or a combination of the above two modes, so as to achieve compatible charging of loads with various preset resonant frequency characteristics.

[0025] In another embodiment, a combination device for wireless charging and receiving loads controlled by a microprocessor includes a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and a resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency jitter control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectifier filter circuit and a CC / CV charging control switch circuit. The MCU main control unit and the peripheral circuit's MCU main control unit emit a PWM signal with a specific frequency and duty cycle to directly drive or drive the main switch and resonant circuit through a drive circuit. The frequency of the PWM signal cycles between two (or more) main frequency points to achieve energy dispersion of the resonant spectrum, thereby improving the conducted EMI (electromagnetic interference) performance of the resonant circuit. This makes the entire system more likely to meet the corresponding EMI regulations, eliminates the need for bulky EMI filter circuits, and simultaneously enables compatible charging of loads with different resonant frequency characteristics.

[0026] The main switch and resonant circuit 1 includes an upper main switch Qsw_UP (MOSFET or transistor), an upper main switch drive resistor R3, a lower main switch Qsw_DN (MOSFET or transistor), a lower main switch drive resistor R4, a main resonant inductor Lr, a main resonant capacitor Cr0, and an AC bypass capacitor Cf. One end of the upper main switch drive resistor R3 is connected to the upper bridge drive output pin PWM_UP of the microprocessor U1. The other end of R3 is connected to the drive pin of the upper main switch Qsw_UP. The current inflow pin of the upper main switch Qsw_UP is connected to the positive terminal of the DC power supply, and the current outflow pin of the upper main switch Qsw_UP is the midpoint of the half-bridge. One end of the drive resistor R4 of the lower main switch is connected to the lower bridge drive output pin PWM_DN of the microprocessor U1, and the other end of R4 is connected to the drive pin of the lower main switch Qsw_DN. The current inflow pin of the lower main switch Qsw_DN is connected to the midpoint of the half-bridge, and the current outflow pin of the lower main switch Qsw_DN is the voltage reference point of the resonant circuit. One end of the main resonant inductor Lr is connected to the midpoint of the half-bridge, and the other end of the main resonant inductor Lr is the resonant midpoint. One end of the main resonant capacitor Cr0 is connected to the resonant midpoint, and the other end of the main resonant capacitor Cr0 is connected to the voltage reference point of the resonant circuit. One end of the AC bypass capacitor Cf is connected to the positive terminal of the DC power supply, and the other end is connected to the voltage reference point of the resonant circuit.

[0027] The MCU main control unit and peripheral circuit 2 include a microprocessor U1 and a Vcc parallel filter capacitor C8. One end of the Vcc parallel filter capacitor C8 is connected to the Vcc pin of the microprocessor U1, and the other end of C8 is connected to the reference ground pin (GND pin) of the microprocessor U1; the reference ground pin of the microprocessor U1 is connected to the negative terminal of the DC input. The MCU main control unit and peripheral circuit MCU main control unit emit PWM signals with specific frequency and duty cycle to directly drive or drive the main switch and resonant circuit through a drive circuit.

[0028] The resonant voltage sampling circuit 3 includes a rectifier diode D_vs, an AC filter capacitor C_vsf, an upper voltage divider resistor R_vs1, a lower voltage divider resistor R_vs2, and a noise filter capacitor C_vsf2. The anode of the rectifier diode D_vs is connected to the resonant midpoint, and the cathode is connected to one end of the AC filter capacitor C_vsf and one end of the upper voltage divider resistor R_vs1. The other end of the AC filter capacitor C_vsf is connected to the resonant circuit voltage reference point. The other end of the upper voltage divider resistor R_vs1 is connected to the ADC_V input terminal of the microprocessor U1, one end of the lower voltage divider resistor R_vs2, and one end of the noise filter capacitor C_vsf2. The other ends of the lower voltage divider resistor R_vs2 and the other end of the noise filter capacitor C_vsf2 are together connected to the reference ground of the microprocessor U1.

[0029] The resonant current sampling circuit 4 includes a sampling resistor R_is, a filter resistor R_isf, and a filter capacitor C_isf. One end of the sampling resistor R_is is connected to the voltage reference point of the resonant circuit and one end of the filter resistor R_isf. The other end of R_is is connected to the negative terminal of the DC input. The other end of the filter resistor R_isf is connected to the ADC_I input terminal of the microprocessor U1 and one end of the filter capacitor C_isf. The other end of the filter capacitor C_isf is connected to the reference ground of the microprocessor U1.

[0030] The resonant voltage sampling circuit 3 samples, rectifies, filters, and divides the resonant voltage of the resonant element, and then sends it to one of the ADC input ports of the MCU main control unit. The resonant current sampling circuit 4 samples and filters the current of the resonant circuit and then sends it to one of the ADC input ports of the MCU main control unit. The receiving circuit uses specific resonant LC parameters. The resonant inductance coupling of the receiving circuit converts the near-field magnetic field energy from the resonant inductor in the transmitting circuit into electrical energy, which is then used to charge the rechargeable battery after passing through the rectification and filtering circuit and the CC / CV charging control switch circuit.

[0031] The MCU main control unit performs analog-to-digital conversion analysis on the resonant voltage and resonant current of the resonant voltage sampling circuit 3 and the resonant current sampling circuit 4 to determine the operating status of the main switch and the resonant circuit, and enters the processing mode corresponding to the operating status. The MCU main control unit performs analog-to-digital conversion analysis on the curve relationship between the resonant voltage and the resonant current and different PWM control frequencies to determine whether the receiving circuit has a load at the corresponding resonant frequency. If not, it maintains a low-power standby mode; if so, it enters the charging mode. In the charging mode, the MCU main control unit continuously monitors the resonant voltage and resonant current, and adjusts the PWM control frequency in real time to make it close to or deviate from the inherent resonant frequency of the main switch and the resonant circuit, thereby changing the resonant strength of the main switch and the resonant circuit. This adjusts the power of the resonant circuit in the receiving circuit and the battery charging current of the CC / CV charging control switch circuit, ensuring that the battery charges in constant current mode, and the charging current remains relatively stable even as the battery voltage rises.

[0032] The MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current under no-load and specific effective receiving loads with different PWM control frequencies. After leaving the factory and in actual use, the characteristic curves of the resonant voltage and resonant current of the receiving circuit with the corresponding different PWM control frequencies are scanned within a certain frequency range and compared with the stored data. When a specific effective receiving load is placed, it can automatically identify and charge normally; when there is no specific effective receiving load, the control circuit maintains a low-power standby mode.

[0033] In another embodiment, the MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current of the unloaded and specific effective receiving loads on ordinary wooden, iron, aluminum alloy, and stainless steel operating surfaces, as well as the characteristic curves of different PWM control frequencies. In actual use after leaving the factory, even on a metal operating surface, the transmitting circuit can analyze and compare the data by scanning and storing the characteristic curves of the resonant voltage and resonant current of the receiving circuit with the corresponding different PWM control frequencies within a certain frequency range. When a specific effective receiving load is placed, it can automatically identify and charge normally; when there is an invalid receiving load (such as ferrous metal), the control circuit maintains a low-power standby mode.

[0034] The resonant frequency jitter control circuit 5 includes an auxiliary switch Q_fsw1 and a resonant frequency fine-tuning capacitor Cr1. The driving terminal of the auxiliary switch Q_fsw1 is connected to the FREQ_SW1 control output terminal of the microprocessor U1. The current inflow terminal of the auxiliary switch Q_fsw1 is connected to one end of the resonant frequency fine-tuning capacitor Cr1, the current outflow terminal of the auxiliary switch Q_fsw1 is connected to the voltage reference point of the resonant circuit, and the other end of the resonant frequency fine-tuning capacitor Cr1 is connected to the resonant midpoint. The resonant frequency switching control circuit 6 includes an auxiliary switch Q_fsw2 and a resonant frequency fine-tuning capacitor Cr2. The driving terminal of the auxiliary switch Q_fsw2 is connected to the FREQ_SW2 control output terminal of the microprocessor U1. The current inflow terminal of the auxiliary switch Q_fsw2 is connected to one end of the resonant frequency fine-tuning capacitor Cr2, the current outflow terminal of the auxiliary switch Q_fsw2 is connected to the voltage reference point of the resonant circuit, and the other end of the resonant frequency fine-tuning capacitor Cr2 is connected to the resonant midpoint. The resonant frequency jitter control circuit 5 and the resonant frequency switching control circuit 6 enable the MCU main control unit to periodically control or continuously and stably control the on / off state of one or more of the auxiliary switching transistors, so that the fine-tuning resonant element corresponding to the auxiliary switching transistor is connected in parallel or not in parallel with the main resonant element, for adjusting the resonant frequency of the main switch and the resonant circuit.

[0035] The resonant circuit of the receiving end circuit includes a receiving end resonant inductor Lr_s, a receiving end resonant capacitor Cr_s, a receiving end rectifier diode D_s, a receiving end filter capacitor Cf_s, a receiving end charging control switch Qsw_s, a receiving end charging current sampling resistor Rcs_s, a receiving end rechargeable battery Vbatt, and a receiving end CC / CV charging control circuit functional block. The receiving end resonant inductor Lr_s has a magnetic field coupling relationship with the main resonant inductor Lr (T5001-A) of the transmitting end circuit. The receiving end resonant inductor Lr_s and the receiving end resonant capacitor Cr_s are connected in parallel (or in series); one end of the receiving end resonant inductor Lr_s and the receiving end resonant capacitor Cr_s is connected to the anode of the receiving end rectifier diode D_s; the other end of the receiving end resonant inductor Lr_s and the receiving end resonant capacitor Cr_s is named the receiving end reference ground; the cathode of the receiving end rectifier diode D_s is connected to the positive terminal of the receiving end filter capacitor Cf_s, the current inflow terminal of the receiving end charging control switch Qsw_s, and the voltage sampling terminal of the receiving end CC / CV charging control circuit functional block; the receiving end filter capacitor Cf_s... The negative terminal of the receiver _s and the ground level common terminal of the receiver CC / CV charging control circuit functional block are connected together to the reference ground of the receiver; the current output terminal of the receiver charging control switch Qsw_s is connected to one end of the receiver charging current sampling resistor Rcs_s and the current sampling positive terminal of the receiver CC / CV charging control circuit functional block; the other end of the receiver charging current sampling resistor Rcs_s is connected to the positive terminal of the receiver rechargeable battery Vbatt and the current sampling negative terminal of the receiver CC / CV charging control circuit functional block; the negative terminal of the receiver rechargeable battery Vbatt is connected to the reference ground of the receiver.

[0036] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and many similar modifications are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the scope of protection of this utility model.

Claims

1. A combination device for wireless charging and receiving load intelligently controlled by a microprocessor, characterized in that, The system includes a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency jitter control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectifier and filter circuit and a CC / CV charging control switch circuit. The main switch and resonant circuit includes a main switch transistor, a main resonant element, and a fine-tuning resonant element. By controlling the on / off combination of the auxiliary switch transistor, the capacitance of the resonant capacitor or the inductance of the main switch and resonant circuit are adjusted, so that the main switch and resonant circuit jitters at adjacent resonant frequency points. This is used to achieve energy dispersion of the resonant spectrum and / or to select one of the different resonant frequency points for continuous operation, thereby achieving compatible charging of loads with various preset resonant frequency characteristics.

2. The combination device for microprocessor-controlled wireless charging and receiving load as described in claim 1, characterized in that, The MCU main control unit and the peripheral circuit's MCU main control unit send PWM signals with specific frequencies and duty cycles to directly drive or drive the main switch and resonant circuit through the drive circuit.

3. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 2, characterized in that, The MCU main control unit performs analog-to-digital conversion analysis on the resonant voltage and resonant current of the resonant voltage sampling circuit and the resonant current sampling circuit to obtain the working status of the main switch and the resonant circuit, and enters the processing mode corresponding to the working status.

4. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 3, characterized in that, The MCU main control unit performs analog-to-digital conversion analysis on the curve relationship between the resonant voltage and the resonant current and different PWM control frequencies to determine whether there is a load with the corresponding resonant frequency in the receiving circuit. If not, it maintains a low-power standby mode; if so, it enters a charging mode.

5. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 4, characterized in that, After entering the charging mode, the MCU main control unit acquires the status of the resonant voltage and the resonant current in real time, and adjusts the PWM control frequency in real time so that the PWM control frequency is close to or deviates from the inherent resonant frequency of the main switch and the resonant circuit, thereby changing the resonant strength of the main switch and the resonant circuit. This adjusts the power of the resonant circuit of the receiving end circuit and the battery charging current of the CC / CV charging control switch circuit, so that the battery is charged in constant current mode.

6. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 4, characterized in that, The MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current under no-load and specific effective receiving load with different PWM control frequencies.

7. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 4, characterized in that, The MCU main control unit has a built-in or external electrically rewritable read-only memory or flash memory, which stores the characteristic curves of the resonant voltage and resonant current of the no-load and specific effective receiving load on ordinary wooden operating table, iron operating table, aluminum alloy operating table, and stainless steel operating table, and the characteristic curves of different PWM control frequencies.

8. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 2, characterized in that, The resonant frequency jitter control circuit and the resonant frequency switching control circuit enable the MCU main control unit to periodically or continuously and stably control the on / off state of one or more auxiliary switching transistors, so that the fine-tuning resonant element corresponding to the auxiliary switching transistor is connected in parallel or not in parallel with the main resonant element, for adjusting the resonant frequency of the main switch and the resonant circuit.

9. The combined device for microprocessor-controlled wireless charging and receiving load as described in claim 1, characterized in that, The resonant voltage sampling circuit samples, rectifies, filters, and divides the resonant voltage of the resonant element, and then sends it to one of the ADC input ports of the MCU main control unit. The resonant current sampling circuit samples and filters the current of the resonant circuit and then sends it to one of the ADC input ports of the MCU main control unit. The receiving circuit uses specific resonant LC parameters, and the resonant inductance coupling of the receiving circuit converts the near-field magnetic field energy from the resonant inductor in the transmitting circuit into electrical energy, which is then used to charge the rechargeable battery after passing through the rectifier and filter circuit and the CC / CV charging control switch circuit.

10. A combination device for wireless charging and receiving load intelligently controlled by a microprocessor, characterized in that, The system includes a transmitting circuit and a receiving circuit. The transmitting circuit includes a main switch and a resonant circuit, an MCU main control unit and peripheral circuits, a resonant voltage sampling circuit, a resonant current sampling circuit, a resonant frequency jitter control circuit, and a resonant frequency switching control circuit. The receiving circuit includes a resonant circuit, which includes a rectification and filtering circuit and a CC / CV charging control switch circuit. The MCU main control unit and peripheral circuits emit a PWM signal with a specific frequency and duty cycle to directly drive or drive the main switch and resonant circuit through a driving circuit. The frequency of the PWM signal cycles through at least two main frequency points to achieve energy dispersion of the resonant spectrum.

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