Wireless charger

Abstract

The invention provides a wireless charger, which comprises a transmitting end, an ASK demodulation module, an FSK modulation module and a control module, and is characterized in that the ASK demodulation module comprises an input end, a half-wave rectification module, a low-pass filtering module and a current regulation module; the input end is used for receiving voltage signals; the half-wave rectification module is connected with the input end and is used for carrying out half-wave rectification on the voltage signal; the low-pass filtering module is connected with the half-wave rectification module and is used for performing low-pass filtering processing on the rectified voltage signal so as to output a low-pass modulation signal; the current adjusting module is connected with the low-pass filtering module, and the wireless charger carries out self-adaptive adjustment through the current adjusting module. According to the wireless charger, the current at the two ends of the current adjusting module is kept constant through the current adjusting module, the stability of the ripple voltage of the capacitor of the low-pass filtering module in the wireless charger is improved, the consistency and the anti-interference capability of the wireless charger are enhanced, and the error rate and the loss are reduced.

Description

Technical Field

[0001] The present application relates to the design field of demodulation circuits, and in particular to an ASK (Amplitude Shift Keying) demodulation circuit and a WPT (Wireless Power Transmission) transmission system. Background Art

[0002] As WPT technology matures, wireless charging technology is developing towards high power and high power density. In related applications, closed-loop control uses FSK (Frequency Shift Keying) or ASK communication methods.

[0003] The ASK decoding circuit in the common ASK communication scheme has the disadvantages of high loss, poor consistency and high bit error rate in high-power and wide-voltage usage scenarios. Summary of the invention

[0004] In view of this, the present application provides a wireless charger to solve the above technical problems.

[0005] The wireless charger provided by the present application includes a transmitting end, an ASK demodulation module, an FSK modulation module and a control module. The first end of the ASK demodulation module is connected to the transmitting end, the second end of the ASK demodulation module is connected to the control module, the first end of the FSK modulation module is connected to the transmitting end, and the second end of the FSK modulation module is connected to the control module.

[0006] The ASK demodulation module includes:

[0007] An input terminal, used for receiving a voltage signal;

[0008] A half-wave rectifier module is connected to the input terminal and is used to perform half-wave rectification on the voltage signal;

[0009] A low-pass filter module is connected to the half-wave rectifier module and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal;

[0010] The current regulating module is connected to the low-pass filtering module and is used to keep the current at both ends of the current regulating module constant.

[0011] Wherein, the wireless charger also includes a load module, and the load module is connected in parallel with the constant current adaptive load module;

[0012] The load modules include:

[0013] A signal amplification module, used for receiving a first modulated signal and amplifying the first modulated signal to output a first amplified signal;

[0014] A waveform shaping module, connected to the signal amplifying module, for shaping the first amplified signal to output a first shaped signal;

[0015] A high-pass filtering module, connected to the low-pass filtering module, for performing high-pass filtering on the low-pass modulation signal to output a first modulation signal;

[0016] The output terminal is used to output the first shaped signal.

[0017] The signal amplification module includes:

[0018] a first operational amplifier, wherein a first terminal of the first operational amplifier is connected to a second terminal of the first operational amplifier via a first resistor;

[0019] A first capacitor, wherein a first end of the first capacitor is connected to a second end of the first operational amplifier via a second resistor, and a second end of the first capacitor is grounded;

[0020] The waveform shaping module includes:

[0021] A second operational amplifier, wherein a first terminal of the second operational amplifier is connected to a second terminal of the second operational amplifier through a third resistor, and a third terminal of the second operational amplifier is connected to a first terminal of the first operational amplifier through a fourth resistor and a fifth resistor;

[0022] a third capacitor, wherein a first end of the third capacitor is connected to the fourth resistor, a first end of the third capacitor is connected to the second end of the second operational amplifier via a fifth resistor, and a second end of the third capacitor is grounded;

[0023] a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the second operational amplifier, and a second end of the fourth capacitor is grounded;

[0024] a fifth capacitor, wherein a first end of the fifth capacitor is connected to the third end of the second operational amplifier, and a second end of the fifth capacitor is grounded;

[0025] A sixth capacitor, wherein a first end of the sixth capacitor is connected to a first end of the second operational amplifier through a sixth resistor, and a second end of the sixth capacitor is grounded.

[0026] Among them, the current regulation module includes a constant current adaptive load module, and the wireless charger performs adaptive regulation through the constant current adaptive load module.

[0027] Among them, the constant current adaptive load module includes:

[0028] A first triode, wherein the collector of the first triode is connected to the low-pass filter module, and the emitter of the first triode is grounded;

[0029] The second triode, the collector of the second triode is connected to the base of the second triode, the base of the second triode is connected to the base of the first triode, the collector of the second triode is connected to the first reference voltage through the seventh resistor, and the emitter of the second triode is grounded.

[0030] Among them, the constant current adaptive load module includes:

[0031] a third triode, wherein the collector of the third triode is connected to the low-pass filter module, and the emitter of the third triode is grounded through an eighth resistor;

[0032] The fourth triode, the collector of the fourth triode is connected to the base of the third triode, the base of the fourth triode is connected to the emitter of the third triode, the collector of the fourth triode is connected to the second reference voltage through the ninth resistor, and the emitter of the fourth triode is grounded.

[0033] Among them, the constant current adaptive load module includes:

[0034] a fifth triode, wherein the collector of the fifth triode is connected to the low-pass filter module, and the emitter of the fifth triode is grounded through a tenth resistor;

[0035] A voltage reference source, wherein the first end of the voltage reference source is connected to the base of the fifth transistor, the second end of the voltage reference source is connected to the emitter of the fifth transistor, the first end of the voltage reference source is connected to the third reference voltage via an eleventh resistor, and the third end of the voltage reference source is grounded.

[0036] Among them, the constant current adaptive load module includes:

[0037] a sixth triode, wherein the collector of the sixth triode is connected to the low-pass filter module, and the emitter of the sixth triode is grounded through a twelfth resistor;

[0038] The third operational amplifier, the first end of the third operational amplifier is connected to the base of the sixth transistor through the thirteenth resistor, the second end of the third operational amplifier is connected to the emitter of the sixth transistor, the third end of the third operational amplifier is connected to the fourth reference voltage through the fourteenth resistor, and the third end of the third operational amplifier is grounded through the fifteenth resistor.

[0039] The load module also includes:

[0040] A high-pass filtering module, connected to the low-pass filtering module, for performing high-pass filtering on the low-pass modulation signal to output a first modulation signal;

[0041] The output terminal is used to output the first shaped signal.

[0042] Among them, the low-pass filter module includes:

[0043] a sixteenth resistor, wherein a first end of the sixteenth resistor is connected to the half-wave rectifier module to receive a rectified voltage signal;

[0044] a seventh capacitor, wherein a first end of the seventh capacitor is connected to the second end of the sixteenth resistor, and a second end of the seventh capacitor is grounded;

[0045] a seventeenth resistor, a first end of the seventeenth resistor being connected to a second end of the sixteenth resistor;

[0046] An eighth capacitor, wherein a first end of the eighth capacitor is connected to a second end of the seventeenth resistor, and a second end of the eighth capacitor is grounded.

[0047] The half-wave rectifier module includes a first diode, a first end of the first diode is connected to the input end for receiving a voltage signal, and a second end of the first diode is connected to the low-pass filter module for outputting a rectified voltage signal.

[0048] The wireless charger provided by the present application includes an input terminal, a half-wave rectifier module, a low-pass filter module and a current regulating module; the input terminal is used to receive a voltage signal; the half-wave rectifier module is connected to the input terminal and is used to perform half-wave rectification on the voltage signal; the low-pass filter module is connected to the half-wave rectifier module and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the current regulating module is connected to the low-pass filter module, and the wireless charger performs adaptive regulation through the current regulating module. The current at both ends of the current regulating module is kept constant by the current regulating module, the stability of the ripple voltage of the capacitor of the low-pass filter module in the wireless charger is improved, the consistency and anti-interference ability of the wireless charger are enhanced, and the bit error rate and loss are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present application will be further described below in conjunction with the accompanying drawings and implementation methods, in which:

[0050] Figure 1 It is a schematic diagram of the framework of the first embodiment of the ASK demodulation module provided by the present application;

[0051] Figure 2 It is a schematic diagram of the framework of the second embodiment of the ASK demodulation module provided by the present application;

[0052] Figure 3 It is a simple circuit diagram of the load module provided by this application;

[0053] Figure 4 This is a simplified circuit diagram of the first embodiment of the ASK demodulation module provided by the present application;

[0054] Figure 5 This is a simplified circuit diagram of the second embodiment of the ASK demodulation module provided by the present application;

[0055] Figure 6 This is a simplified circuit diagram of the third embodiment of the ASK demodulation module provided by the present application;

[0056] Figure 7 This is a simplified circuit diagram of the fourth embodiment of the ASK demodulation module provided by the present application;

[0057] Figure 8 This is a simplified circuit diagram of the fifth embodiment of the ASK demodulation module provided by the present application;

[0058] Fig. 9 This is a simplified circuit diagram of the sixth embodiment of the ASK demodulation module provided by the present application;

[0059] Fig.10 This is a simplified circuit diagram of the seventh embodiment of the ASK demodulation module provided by the present application;

[0060] Fig.11 It is a schematic diagram of the framework of the third embodiment of the ASK demodulation module provided by the present application;

[0061] Fig.12 This is a simplified circuit diagram of the seventh embodiment of the ASK demodulation module provided by the present application;

[0062] Fig.13 It is a schematic diagram of the framework of the first embodiment of the WPT sending system provided by the present application. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0064] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0065] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0066] In high-power, wide-voltage usage scenarios, common wireless chargers have the disadvantages of high loss, poor consistency, and high bit error rate. The present application provides a wireless charger to solve the above technical problems. The wireless charger includes a transmitter, an ASK demodulation module, an FSK modulation module, and a control module. The first end of the ASK demodulation module is connected to the transmitter, the second end of the ASK demodulation module is connected to the control module, the first end of the FSK modulation module is connected to the transmitter, and the second end of the FSK modulation module is connected to the control module. Please refer to Figure 1 , Figure 1 It is a framework diagram of the first embodiment of the ASK demodulation module provided in the present application, which specifically includes an input end 11, a half-wave rectification module 12, a low-pass filtering module 13 and a current regulation module 115, wherein the current regulation module 115 includes a constant current adaptive load module 15.

[0067] The input terminal 11 is used to receive a voltage signal. Optionally, the input terminal 11 is connected to a wireless charging coil to receive a voltage signal from the wireless charging coil.

[0068] The half-wave rectifier module 12 is connected to the input terminal 11 and is used to perform half-wave rectification on the voltage signal, which may be an AC signal. Optionally, the half-wave rectifier is a common circuit that uses the unidirectional conduction characteristics of a diode to perform rectification, and is used to convert an AC signal into a DC signal.

[0069] The low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal. Optionally, low-pass filtering is a filtering method, and the rule is that low-frequency signals can pass normally, while high-frequency signals exceeding a set critical value are blocked or weakened.

[0070] Among them, the current regulating module 115 is connected to the low-pass filter module 13, and is used to keep the current at both ends of the current regulating module constant, wherein the wireless charger performs adaptive adjustment through the current regulating module 115, for example, the current at both ends of the current regulating module is kept constant through the current regulating module, thereby ensuring that the power loss Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art. Optionally, one end of the current regulating module 115 is connected to the low-pass filter module 13, and the other end is grounded; in this embodiment, the function of the current regulating module 115 is equivalent to a constant current source; adaptive adjustment is performed through the current regulating module 115, for example, the current value at both ends of the current regulating module 115 is kept constant.

[0071] Please note that, see Figure 1 The current regulating module 115 in this embodiment includes a constant current adaptive load module 15, and the wireless charger performs adaptive regulation through the constant current adaptive load module 15. For example, the constant current adaptive load module 15 keeps the current at both ends of the current regulating module 115 constant. In the following embodiments, the constant current adaptive load module 15 is used for description.

[0072] Optionally, see Figure 2 , Figure 2 is a schematic diagram of the framework of the second embodiment of the ASK demodulation module provided by the present application, Figure 2 The ASK demodulation module includes Figure 1 The input terminal 11, the half-wave rectifier module 12, the low-pass filter module 13 and the constant current adaptive load module 15, as well as the connection relationship and function definition between the modules, also include a load module 14. The load module 14 is connected in parallel with the constant current adaptive load module 15 to form the load of the wireless charger. The constant current adaptive load module keeps the load terminal constant, improves the stability of the ripple voltage of the capacitor of the low-pass filter module in the wireless charger, enhances the consistency and anti-interference ability of the wireless charger, and reduces the bit error rate and loss.

[0073] Optionally, see Figure 3As shown, Figure 3 It is a simple circuit diagram of the load module provided in the present application. The load module may include a signal amplification module 17 and a waveform shaping module 18 .

[0074] Among them, see Figure 3 As shown, the signal amplification module 17 includes a first operational amplifier F1 and a first capacitor C1, the first end of the first operational amplifier F1 is connected to the second end of the first operational amplifier F1 through a first resistor R1; the first end of the first capacitor C1 is connected to the second end of the first operational amplifier F1 through a second resistor R2, and the second end of the first capacitor C1 is grounded.

[0075] Among them, see Figure 3 As shown, the waveform shaping module 18 includes a second operational amplifier F2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6. The first end of the second operational amplifier F2 is connected to the second end of the second operational amplifier F2 through the third resistor R3, and the second end of the second operational amplifier F2 is connected to the first end of the first operational amplifier F1 through the fourth resistor R4 and the fifth resistor R5; the first end of the third capacitor C3 is connected to the fourth resistor R4, the first end of the third capacitor C3 is connected to the second end of the second operational amplifier F2 through the fifth resistor R5, and the second end of the third capacitor C3 is grounded; the first end of the fourth capacitor C4 is connected to the second end of the second operational amplifier F2, and the second end of the fourth capacitor C4 is grounded; the first end of the fifth capacitor C5 is connected to the third end of the second operational amplifier, and the second end of the fifth capacitor C5 is grounded; the first end of the sixth capacitor C6 is connected to the first end of the second operational amplifier F2 through the sixth resistor R6, and the second end of the sixth capacitor C6 is grounded.

[0076] Optionally, see Figure 4 , Figure 4 It is a simplified circuit diagram of the first embodiment of the ASK demodulation module provided by the present application. Among them, the low-pass filter module 13 includes a low-pass filter resistor Ra and a low-pass filter capacitor Ca; the ASK demodulation module also includes a preset resistor Rb.

[0077] Optionally, see Figure 5 , Figure 5 It is a simplified circuit diagram of the second embodiment of the ASK demodulation module provided by the present application, wherein the low-pass filter module 13 includes a low-pass filter resistor Ra and a low-pass filter capacitor Ca; the load module 14 includes a load resistor Rc; and the ASK demodulation module further includes a preset resistor Rb.

[0078] Optionally, the peak voltage Vpk of the wireless charging transmitting coil received by the input terminal 11 is equal to the peak voltage Vc of the low-pass filter capacitor Ca.

[0079] Optionally, the ripple voltage △Vc of the low-pass filter capacitor Ca is calculated as:

[0080]

[0081] Here, ripple voltage refers to the AC component contained in the output DC voltage; t represents half of the period of the ASK signal.

[0082] Optionally, the power loss Pb of the preset resistor Rb is calculated as:

[0083]

[0084] Specifically, it can be seen from formulas (1) and (2) that the ripple voltage ΔVc of the low-pass filter capacitor Ca is proportional to the peak voltage Vpk, and the power loss Pb is proportional to the square of the peak voltage Vpk.

[0085] Specifically, in the ASK demodulation module of this embodiment, in the high-power and wide-voltage usage scenario, the ripple voltage △Vc of the low-pass filter capacitor Ca varies widely, the consistency of the ASK demodulation module is poor, the power loss Pb of the preset resistor Rb is large, and the interference received by the subsequent circuit is large, which leads to a high bit error rate of the ASK demodulation module. For example, the peak voltage Vpk of the wireless charging transmitting coil varies from 7V to 100V.

[0086] See also Figure 6 , Figure 6 is a simplified circuit diagram of the third embodiment of the ASK demodulation module provided by the present application, Figure 6 The examples provided are Figure 5 Described on the basis of.

[0087] The ASK demodulation module of this embodiment includes a constant current adaptive load module 15, and the constant current adaptive load module 15 includes a constant current source Ib.

[0088] Optionally, the ripple voltage △Vc of the low-pass filter capacitor Ca is calculated as:

[0089]

[0090] Wherein, t represents half of the period of the ASK signal, and I1 represents the constant current source current of the constant current source Ib.

[0091] Optionally, the power loss Pi of the constant current source Ib is calculated as:

[0092] Pi=Vpk*I1 (4).

[0093] Specifically, it can be seen from formulas (3) and (4) that the ripple voltage △Vc of the low-pass filter capacitor Ca is independent of the peak voltage Vpk. Therefore, the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate; the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art.

[0094] The ASK demodulation module provided in this embodiment includes an input terminal 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input terminal 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input terminal 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15. Among them, the constant current adaptive load module 15 keeps the load end current constant, improves the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhances the consistency and anti-interference ability of the ASK demodulation module, and reduces the bit error rate and loss.

[0095] See also Figure 7 , Figure 7 is a simplified circuit diagram of the fourth embodiment of the ASK demodulation module provided by the present application, Figure 7 The ASK demodulation module is provided in Figure 6 Description based on .

[0096] In the present application, the first reference voltage, the second reference voltage, the third reference voltage and the fourth reference voltage may be a power supply voltage VDD of the ASK demodulation module. For example, the power supply voltage VDD may be 5V or 3.3V.

[0097] Among them, the constant current adaptive load module 15 includes a first transistor Q1 and a second transistor Q2, the collector of the first transistor Q1 is connected to the low-pass filter module 13, and the emitter of the first transistor Q1 is grounded; the collector of the second transistor Q2 is connected to the base of the second transistor Q2, the base of the second transistor Q2 is connected to the base of the first transistor Q1, the collector of the second transistor Q2 is connected to the power supply voltage VDD through the seventh resistor R7, and the emitter of the second transistor Q2 is grounded.

[0098] Optionally, the first transistor Q1 and the second transistor Q2 are transistors of the same model.

[0099] Optionally, the constant current value I2 of the constant current adaptive load module 15 in this embodiment is calculated as:

[0100]

[0101] Wherein, Vbe1 represents the emitter junction voltage of the first transistor Q1 and the second transistor Q2.

[0102] Specifically, it can be seen from formulas (5), (3) and (4) that the ripple voltage △Vc of the low-pass filter capacitor Ca is independent of the peak voltage Vpk. Therefore, the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate; the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art.

[0103] The ASK demodulation module provided in this embodiment includes an input end 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15.

[0104] In this embodiment, it can be seen from formula (5) that the constant current value I2 of the constant current adaptive load module 15 is related to the power supply voltage VDD, the emitter junction voltage Vbe1 of the first transistor Q1 and the second transistor Q2, and the resistance value of the seventh resistor R7, while the power supply voltage VDD, the emitter junction voltage Vbe1 of the first transistor Q1 and the second transistor Q2, and the resistance value of the seventh resistor R7 are fixed values, so the constant current value I2 of the constant current adaptive load module 15 is a fixed value. It can be seen from formula (3) that the ripple voltage △Vc of the low-pass filter capacitor Ca has nothing to do with the peak voltage Vpk, so the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate. It can be seen from formula (4) that the power loss Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art. In summary, the constant current adaptive load module 15 is used to keep the load end current constant, thereby improving the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhancing the consistency and anti-interference ability of the ASK demodulation module, and reducing the bit error rate and loss.

[0105] See also Figure 8 , Figure 8 is a simplified circuit diagram of the fifth embodiment of the ASK demodulation module provided by the present application, Figure 8 The ASK demodulation module is provided in Figure 6 Description based on .

[0106] Among them, the constant current adaptive load module 15 includes a third triode Q3 and a fourth triode Q4, the collector of the third triode Q3 is connected to the low-pass filter module 13, and the emitter of the third triode Q3 is grounded through the eighth resistor R8; the collector of the fourth triode Q4 is connected to the base of the third triode Q3, the base of the fourth triode Q4 is connected to the emitter of the third triode Q3, the collector of the fourth triode Q4 is connected to the power supply voltage VDD through the ninth resistor R9, and the emitter of the fourth triode Q4 is grounded.

[0107] Optionally, the power supply voltage VDD is the power supply voltage of the ASK demodulation module, for example, the power supply voltage VDD is 5V or 3.3V; the third transistor Q3 and the fourth transistor Q4 are transistors of the same model.

[0108] Optionally, the constant current value I3 of the constant current adaptive load module 15 in this embodiment is calculated as:

[0109]

[0110] Wherein, Vbe2 represents the emitter junction voltage of the fourth transistor Q4.

[0111] Specifically, it can be seen from formulas (6), (3) and (4) that the ripple voltage △Vc of the low-pass filter capacitor Ca is independent of the peak voltage Vpk. Therefore, the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate; the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art.

[0112] The ASK demodulation module provided in this embodiment includes an input end 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15.

[0113] In this embodiment, it can be seen from formula (6) that the constant current value I3 of the constant current adaptive load module 15 is related to the emitter junction voltage Vbe2 of the fourth transistor Q4 and the resistance value of the eighth resistor R8, and the emitter junction voltage Vbe2 of the fourth transistor Q4 and the resistance value of the eighth resistor R8 are fixed values, so the constant current value I3 of the constant current adaptive load module 15 is a fixed value. It can be seen from formula (3) that the ripple voltage △Vc of the low-pass filter capacitor Ca has nothing to do with the peak voltage Vpk, so the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate. It can be seen from formula (4) that the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art. In summary, the constant current adaptive load module 15 is used to keep the load end current constant, improve the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhance the consistency and anti-interference ability of the ASK demodulation module, and reduce the bit error rate and loss.

[0114] See also Fig. 9 , Fig. 9 is a simplified circuit diagram of the sixth embodiment of the ASK demodulation module provided by the present application, Fig. 9 The ASK demodulation module is provided in Figure 6 Description based on .

[0115] Among them, the constant current adaptive load module 15 includes a fifth transistor Q5 and a voltage reference source U2, the collector of the fifth transistor Q5 is connected to the low-pass filter module 13, and the emitter of the fifth transistor Q5 is grounded through the tenth resistor R10; the first end of the voltage reference source U2 is connected to the base of the fifth transistor Q5, the second end of the voltage reference source U2 is connected to the emitter of the fifth transistor Q5, the first end of the voltage reference source U2 is connected to the power supply voltage VDD through the eleventh resistor R11, and the third end of the voltage reference source U2 is grounded.

[0116] Optionally, the supply voltage VDD is a supply voltage of a voltage reference source U2.

[0117] Optionally, the constant current value I4 of the constant current adaptive load module 15 in this embodiment is calculated as:

[0118]

[0119] Wherein, Vref is the reference voltage of the voltage reference source U2, that is, the voltage of the second end of the voltage reference source U2, for example, Vref is 2.5V.

[0120] Specifically, it can be seen from formulas (7), (3) and (4) that the ripple voltage △Vc of the low-pass filter capacitor Ca is independent of the peak voltage Vpk. Therefore, the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate; the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art.

[0121] The ASK demodulation module provided in this embodiment includes an input end 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15.

[0122] In this embodiment, it can be seen from formula (7) that the constant current value I4 of the constant current adaptive load module 15 is related to the reference voltage Vref of the voltage reference source U2 and the resistance value of the tenth resistor R10, while the emitter junction voltage Vbe2 of the fourth transistor Q4 and the resistance value of the tenth resistor R10 are fixed values, so the constant current value I4 of the constant current adaptive load module 15 is a fixed value. It can be seen from formula (3) that the ripple voltage △Vc of the low-pass filter capacitor Ca has nothing to do with the peak voltage Vpk, so the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate. It can be seen from formula (4) that the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art. In summary, the constant current adaptive load module 15 is used to keep the load end current constant, improve the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhance the consistency and anti-interference ability of the ASK demodulation module, and reduce the bit error rate and loss.

[0123] See also Fig.10 , Fig.10 is a simplified circuit diagram of the seventh embodiment of the ASK demodulation module provided by the present application, Fig.10 The ASK demodulation module is provided in Figure 6 Description based on .

[0124] Among them, the constant current adaptive load module 15 includes a sixth transistor Q6 and a third operational amplifier U3, the collector of the sixth transistor Q6 is connected to the low-pass filter module 13, and the emitter of the sixth transistor Q6 is grounded through the twelfth resistor R12; the first end of the third operational amplifier U3 is connected to the base of the sixth transistor Q6 through the thirteenth resistor R13, the second end of the third operational amplifier U3 is connected to the emitter of the sixth transistor Q6, the third end of the third operational amplifier U3 is connected to the power supply voltage VDD through the fourteenth resistor R14, and the third end of the third operational amplifier U3 is grounded through the fifteenth resistor R15.

[0125] Optionally, the power supply voltage VDD is the power supply voltage of the third operational amplifier U3; the first terminal of the third operational amplifier U3 is the output terminal, the second terminal of the third operational amplifier U3 is the negative input terminal, and the third terminal of the third operational amplifier U3 is the positive input terminal.

[0126] Optionally, the constant current value I5 of the constant current adaptive load module 15 in this embodiment is calculated as:

[0127]

[0128] Specifically, it can be seen from formulas (8), (3) and (4) that the ripple voltage △Vc of the low-pass filter capacitor Ca is independent of the peak voltage Vpk. Therefore, the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate; the loss power Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art.

[0129] The ASK demodulation module provided in this embodiment includes an input end 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15.

[0130] In this embodiment, it can be seen from formula (8) that the constant current value I5 of the constant current adaptive load module 15 is related to the power supply voltage VDD, the resistance value of the twelfth resistor R12, the resistance value of the fourteenth resistor R14 and the resistance value of the fifteenth resistor R15, and the power supply voltage VDD, the resistance value of the twelfth resistor R12, the resistance value of the fourteenth resistor R14 and the resistance value of the fifteenth resistor R15 are fixed values, so the constant current value I5 of the constant current adaptive load module 15 is a fixed value. It can be seen from formula (3) that the ripple voltage △Vc of the low-pass filter capacitor Ca has nothing to do with the peak voltage Vpk, so the ASK demodulation module of this embodiment has good consistency, strong anti-interference ability and low bit error rate. It can be seen from formula (4) that the power loss Pi of the constant current source Ib is proportional to the peak voltage Vpk, and the loss is lower than that of the prior art. In summary, the constant current adaptive load module 15 is used to keep the load end current constant, thereby improving the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhancing the consistency and anti-interference ability of the ASK demodulation module, and reducing the bit error rate and loss.

[0131] See also Fig.11 , Fig.11 is a schematic diagram of the framework of the third embodiment of the ASK demodulation module provided by the present application, Fig.11 The ASK demodulation module is provided in Figure 2 Description based on .

[0132] Among them, the load module 14 includes a high-pass filtering module 16, a signal amplifying module 17, a waveform shaping module 18 and an output end 19. The high-pass filtering module 16 is connected to the low-pass filtering module 13, and is used to perform high-pass filtering on the low-pass modulation signal to output a first modulation signal; the signal amplifying module 17 is connected to the high-pass filtering module 16, and is used to amplify the first modulation signal to output a first amplified signal; the waveform shaping module 18 is connected to the signal amplifying module 17, and is used to perform shaping on the first amplified signal to output a first shaped signal; the output end 19 is used to output the first shaped signal.

[0133] Optionally, the rule of high-pass filtering is that high-frequency signals can pass normally, while low-frequency signals below a set critical value are blocked and weakened; signal amplification can be achieved by a combination of an operational amplifier and a resistor; waveform shaping is to shape the first amplified signal into a square wave and then output it, and waveform shaping can also be achieved by a combination of an operational amplifier and a resistor.

[0134] The ASK demodulation module provided in this embodiment includes an input end 11, a half-wave rectifier module 12, a low-pass filter module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectifier module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filter module 13 is connected to the half-wave rectifier module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filter module 13; the constant current adaptive load module 15 is connected to the low-pass filter module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation module is adaptively adjusted through the constant current adaptive load module 15.

[0135] In this embodiment, the load module may include a high-pass filter module 16, a signal amplification module 17, a waveform shaping module 18 and an output terminal 19. The high-pass filter module 16 may perform high-pass filtering on the low-pass modulation signal to output a first modulation signal; the signal amplification module 17 may perform amplification processing on the first modulation signal to output a first amplified signal; the waveform shaping module 18 may perform shaping processing on the first amplified signal to output a first shaped signal; and the output terminal 19 may output the first shaped signal.

[0136] Optionally, in some embodiments of the present application, see Fig.12 As shown, Fig.12 It is a simple circuit diagram of the seventh embodiment of the ASK demodulation module provided in the present application. The low-pass filtering module 13 includes a sixteenth resistor R16, a seventh capacitor C7, a seventeenth resistor R17 and an eighth capacitor C8. The first end of the sixteenth resistor R16 is connected to the half-wave rectifier module 12 to receive the rectified voltage signal; the first end of the seventh capacitor C7 is connected to the second end of the sixteenth resistor R16, and the second end of the seventh capacitor C7 is grounded; the first end of the seventeenth resistor R17 is connected to the second end of the sixteenth resistor R16; the first end of the eighth capacitor C8 is connected to the second end of the seventeenth resistor R17, and the second end of the eighth capacitor C8 is grounded.

[0137] Specifically, the sixteenth resistor R16, the seventh capacitor C7, the seventeenth resistor R17 and the eighth capacitor C8 in the low-pass filter module 13 in this embodiment constitute a secondary low-pass filter, and the constant current adaptive load module 15 constitutes a variable adaptive load of the low-pass filter module 13, that is, a non-traditional fixed load, for example Figure 2 The constant current adaptive load module 15 keeps the load current constant, improves the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation module, enhances the consistency and anti-interference ability of the ASK demodulation module, and reduces the bit error rate and loss.

[0138] Optionally, in some embodiments of the present application, please continue to refer to Fig.10 The half-wave rectifier module 12 includes a first diode D1, a first end of the first diode D1 is connected to the input end 11 to receive a voltage signal, and a second end of the first diode D1 is connected to the low-pass filter module 13 to output a rectified voltage signal. Among them, the half-wave rectifier is the most commonly used circuit for rectifying using the unidirectional conductivity of the diode, and is used to convert alternating current into direct current. Optionally, a complete half-wave rectifier circuit includes: a diode, a transformer, and a resistive load.

[0139] The present application also provides a WPT transmission system, including the ASK demodulation circuit in the above embodiment, see Fig.13 , Fig.13 It is a schematic diagram of the framework of the first embodiment of the WPT sending system provided by the present application.

[0140] In this embodiment, the ASK demodulation module 102 includes the ASK demodulation module 102 in the above embodiment, which is applied to the WPT transmitting system 100. The present application also provides a WPT transmitting system 100, including a WPT transmitting end 101, an ASK demodulation module 102, a first main control module 103 and an FSK modulation module 104. The WPT transmitting end 101 is used to output a voltage signal; the ASK demodulation module 102 is connected to the WPT transmitting end 101, and is used to demodulate the voltage signal and output a first demodulated signal; the first main control module 103 is connected to the ASK demodulation module 102, and is used to receive the first demodulated signal and output a first control signal; the FSK modulation module 104 is connected to the first main control module 103 and the WPT transmitting end 101, and is used to modulate the first control signal and output the first modulated signal to the WPT transmitting end 101.

[0141] Optionally, WPT converts electrical energy into other forms of relay energy, such as electromagnetic field energy, laser, microwave and mechanical waves, through a transmitter, transmits it over a certain distance, and then converts the relay energy into electrical energy through a receiver to achieve wireless transmission of electrical energy.

[0142] The WPT transmitting system 100 provided in this embodiment includes a WPT transmitting end 101, an ASK demodulation module 102, a first main control module 103 and an FSK modulation module 104, wherein the ASK demodulation module 102 includes an input end 11, a half-wave rectification module 12, a low-pass filtering module 13, a load module 14 and a constant current adaptive load module 15; the input end 11 is used to receive a voltage signal; the half-wave rectification module 12 is connected to the input end 11, and is used to perform half-wave rectification on the voltage signal; the low-pass filtering module 13 is connected to the half-wave rectification module 12, and is used to perform low-pass filtering on the rectified voltage signal to output a low-pass modulation signal; the load module 14 is connected to the low-pass filtering module 13; the constant current adaptive load module 15 is connected to the low-pass filtering module 13, and is connected in parallel with the load module 14, wherein the ASK demodulation circuit is adaptively adjusted through the constant current adaptive load module 15. Among them, the constant current adaptive load module 15 is used to keep the load end current constant, thereby improving the stability of the ripple voltage △Vc of the capacitor of the low-pass filter module 13 in the ASK demodulation circuit, enhancing the consistency and anti-interference ability of the ASK demodulation circuit, reducing the bit error rate and loss, and thus ensuring the consistency and anti-interference ability of the WPT transmission system.

[0143] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A wireless charger, characterized in that: It includes a transmitting end, an ASK demodulation module, an FSK modulation module and a control module, wherein the first end of the ASK demodulation module is connected to the transmitting end, the second end of the ASK demodulation module is connected to the control module, the first end of the FSK modulation module is connected to the transmitting end, and the second end of the FSK modulation module is connected to the control module. The ASK demodulation module comprises: An input terminal, used for receiving a voltage signal; A half-wave rectification module, connected to the input end, for performing half-wave rectification on the voltage signal; A low-pass filtering module, connected to the half-wave rectifying module, and configured to perform low-pass filtering on the rectified voltage signal to output a low-pass modulated signal; The current regulating module is connected to the low-pass filtering module and is used to keep the current at both ends of the current regulating module constant.

2. The wireless charger according to claim 1, characterized in that: The wireless charger further includes a load module, and the load module is connected in parallel with the current regulating module; The load module comprises: A signal amplification module, used for receiving a first modulated signal, and amplifying the first modulated signal to output a first amplified signal; a waveform shaping module, connected to the signal amplifying module, and configured to perform shaping processing on the first amplified signal to output a first shaped signal; A high-pass filtering module, connected to the low-pass filtering module, and configured to perform high-pass filtering on the low-pass modulation signal to output a first modulation signal; The output end is used to output the first shaped signal.

3. The wireless charger according to claim 2, characterized in that: The signal amplification module comprises: a first operational amplifier, wherein a first terminal of the first operational amplifier is connected to a second terminal of the first operational amplifier through a first resistor; A first capacitor, wherein a first end of the first capacitor is connected to a second end of the first operational amplifier through a second resistor, and a second end of the first capacitor is grounded; The waveform shaping module comprises: a second operational amplifier, wherein a first terminal of the second operational amplifier is connected to a second terminal of the second operational amplifier through a third resistor, and a third terminal of the second operational amplifier is connected to a first terminal of the first operational amplifier through a fourth resistor and a fifth resistor; a third capacitor, wherein a first end of the third capacitor is connected to the fourth resistor, a first end of the third capacitor is connected to a second end of the second operational amplifier through the fifth resistor, and a second end of the third capacitor is grounded; a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the second operational amplifier, and a second end of the fourth capacitor is grounded; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the third end of the second operational amplifier, and a second end of the fifth capacitor is grounded; A sixth capacitor, wherein a first end of the sixth capacitor is connected to the first end of the second operational amplifier through a sixth resistor, and a second end of the sixth capacitor is grounded.

4. The wireless charger according to any one of claims 1 to 3, characterized in that: The current regulation module includes a constant current adaptive load module, and the wireless charger performs adaptive regulation through the constant current adaptive load module.

5. The wireless charger according to claim 4, characterized in that: The constant current adaptive load module comprises: A first triode, wherein the collector of the first triode is connected to the low-pass filter module, and the emitter of the first triode is grounded; A second triode, the collector of the second triode is connected to the base of the second triode, the base of the second triode is connected to the base of the first triode, the collector of the second triode is connected to the first reference voltage through the seventh resistor, and the emitter of the second triode is grounded.

6. The wireless charger according to claim 4, characterized in that: The constant current adaptive load module comprises: a third triode, wherein the collector of the third triode is connected to the low-pass filter module, and the emitter of the third triode is grounded through an eighth resistor; A fourth triode, wherein the collector of the fourth triode is connected to the base of the third triode, the base of the fourth triode is connected to the emitter of the third triode, the collector of the fourth triode is connected to the second reference voltage via a ninth resistor, and the emitter of the fourth triode is grounded.

7. The wireless charger according to claim 4, characterized in that: The constant current adaptive load module comprises: a fifth triode, wherein the collector of the fifth triode is connected to the low-pass filter module, and the emitter of the fifth triode is grounded through a tenth resistor; A voltage reference source, wherein the first end of the voltage reference source is connected to the base of the fifth transistor, the second end of the voltage reference source is connected to the emitter of the fifth transistor, the first end of the voltage reference source is connected to the third reference voltage via an eleventh resistor, and the third end of the voltage reference source is grounded.

8. The wireless charger according to claim 4, characterized in that: The constant current adaptive load module comprises: a sixth triode, wherein the collector of the sixth triode is connected to the low-pass filter module, and the emitter of the sixth triode is grounded through a twelfth resistor; A third operational amplifier, wherein the first end of the third operational amplifier is connected to the base of the sixth transistor through a thirteenth resistor, the second end of the third operational amplifier is connected to the emitter of the sixth transistor, the third end of the third operational amplifier is connected to the fourth reference voltage through a fourteenth resistor, and the third end of the third operational amplifier is grounded through a fifteenth resistor.

9. The wireless charger according to claim 1, characterized in that: The low-pass filtering module comprises: a sixteenth resistor, a first end of the sixteenth resistor being connected to the half-wave rectifier module to receive the rectified voltage signal; a seventh capacitor, a first end of the seventh capacitor being connected to the second end of the sixteenth resistor, and a second end of the seventh capacitor being grounded; a seventeenth resistor, a first end of the seventeenth resistor being connected to a second end of the sixteenth resistor; An eighth capacitor, wherein a first end of the eighth capacitor is connected to a second end of the seventeenth resistor, and a second end of the eighth capacitor is grounded.

10. The wireless charger according to claim 1, characterized in that: The half-wave rectifier module includes a first diode, a first end of the first diode is connected to the input end for receiving a voltage signal, and a second end of the first diode is connected to the low-pass filter module for outputting the rectified voltage signal.

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