Far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit

Abstract

The utility model discloses a far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit, which relates to the field of energy signal transmission, and comprises a transmitting unit, a receiving module, a modulation module, a first triode and a second triode, the first triode is used for receiving analog signals and providing input voltage for the transmitting module, and the second triode is used for receiving the analog signals; the modulation module generates frequency square waves and sends the frequency square waves to the transmitting module through the second triode; and the receiving unit comprises a receiving module and a signal receiving end, the receiving module receives the electric energy and the modulation signal from the transmitting module, and the signal receiving end performs feature extraction on the electric energy and the modulation signal. According to the non-radiative magnetic coupling principle, far-field low-frequency electromagnetic wave resonance is utilized, the transmission distance is effectively increased, energy transmission and signal receiving are synchronously achieved, and mixed transmission of signals and electric energy is achieved by extracting signal features and being large in signal strength and free of distortion or slightly distorted.

Description

Technical Field

[0001] The utility model relates to the field of energy signal transmission, in particular to an energy signal hybrid transmission circuit with far-field low-frequency electromagnetic coupling. Background Art

[0002] The transmission of electric energy plays a very important role in people's lives. The modern transmission of electric energy mainly relies on wired medium conductive transmission. However, in daily life, these media will inevitably have problems such as aging and wear. The non-contact electric energy transmission technology has been realized and solved the power supply problems in these specific occasions. In actual applications, only the transmission of electric energy often cannot meet the operation requirements of the entire system. Therefore, it is necessary to add a signal channel to transmit data such as status information while transmitting energy.

[0003] The current passive signal transmission system has problems such as short transmission distance, obvious decline in transmission efficiency with the increase of distance, low signal transmission rate, and poor stability. Summary of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the specification of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions shall not be used to limit the scope of the utility model.

[0005] In view of the problems existing in the above or prior art, the present utility model is proposed.

[0006] Therefore, the purpose of the present utility model is to provide an energy signal hybrid transmission circuit with far-field low-frequency electromagnetic coupling, whose passive signal transmission system has problems such as short transmission distance, obvious decline in transmission efficiency with the increase of distance, low signal transmission rate, and poor stability.

[0007] To solve the above technical problems, the present utility model provides the following technical solution: An energy signal hybrid transmission circuit with far-field low-frequency electromagnetic coupling, which includes a transmitting unit, including a transmitting module, a modulating module, a first triode, and a second triode. The first triode receives an analog signal and provides an input voltage to the transmitting module. The modulating module generates a frequency square wave and sends it to the transmitting module through the second triode; a receiving unit, including a receiving module and a signal receiving end. The receiving module receives electric energy and a modulation signal from the transmitting module, and the signal receiving end extracts the characteristics of the electric energy and the modulation signal.

[0008] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the first triode is an NMOS transistor, the gate of the first triode receives an analog signal, the drain of the first triode receives a voltage, and the source of the first triode provides a voltage for the first inductance coil of the transmitting module.

[0009] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the modulation module includes an oscillator, the oscillator receives a differential signal through the IN+ pin and the IN- pin, transforms and couples the signal through the CT pin, and is connected to the base of the second triode through the OUT A pin.

[0010] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the collector of the second triode is connected to the first inductance coil.

[0011] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the second triode transmits the modulated analog signal to the first inductance coil.

[0012] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: a first steady current capacitor is connected in parallel across the two ends of the first inductance coil.

[0013] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the receiving module includes a second inductance coil, and the second inductance coil and the first inductance coil form a resonance structure.

[0014] As a preferred embodiment of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling of the present utility model, the following applies: the second inductance coil is connected to the signal receiving end through a diode, and a second steady current capacitor is connected in parallel across the two ends of the second inductance coil.

[0015] Advantages of the present utility model: Through the non-radiative magnetic coupling principle, by utilizing the resonance of far-field low-frequency electromagnetic waves, the transmission distance is effectively increased, and energy transfer and signal reception are synchronously achieved. Through signal detection, low-pass filtering and other processing, features are extracted, and the signal intensity is large, with little or no distortion, realizing the hybrid transmission of signals and electric energy. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings. Among them:

[0017] Figure 1 It is the signal passive transmission circuit diagram of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling.

[0018] Figure 2 It is the amplitude modulation simulation diagram of the passive signal transmission of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling.

[0019] Figure 3 It is the passive signal half-envelope diagram of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling.

[0020] Figure 4 It is the audio carrier signal waveform diagram of the energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling. Specific Embodiments

[0021] To make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0023] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0024] Embodiment 1

[0025] Refer to Figure 1, which is the first embodiment of the present utility model. This embodiment provides an energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling, which includes a transmitting unit 100. The transmitting unit 100 provides a basis for the reception and transmission of analog signals, and includes a transmitting module 101, a modulation module 102, a first triode Q1 and a second triode Q2. The first triode Q1 receives the analog signal and provides an input voltage to the transmitting module 101. The modulation module 102 generates a frequency square wave and sends it to the transmitting module 101 through the second triode Q2; a receiving unit 200, the receiving unit 200 provides a basis for the signal feature extraction of electric energy and modulation signals, and includes a receiving module 201 and a signal receiving end 202. The receiving module 201 receives the electric energy and modulation signals from the transmitting module 101, and the signal receiving end 202 extracts the signal features of the electric energy and modulation signals.

[0026] During use, after the first triode Q1 in the transmitting unit 100 receives the analog signal, a square wave of a certain frequency is generated through the modulation module 102. The signal features of the modulated analog signal are carried by the energy and sent to the transmitting module 101 through the second triode Q2. The transmitting module 101 performs low-frequency electromagnetic coupling transmission. Using the far-field low-frequency electromagnetic coupling effect, resonance occurs between the transmitting unit 100 and the receiving unit 200, resulting in a strong interaction between the transmitting module 101 and the receiving module 201; when the receiving module 201 receives the electric energy and modulation signals in the electromagnetic field, the obtained electric energy is converted into a stable current through a rectifying circuit and a constant current circuit to provide energy for the receiving unit 200, and the signal receiving end is used to extract the signal features, realizing the simultaneous real-time transmission of signals while achieving energy transmission.

[0027] Embodiment 2

[0028] Referring to Figure 1 , which is the second embodiment of the present utility model. This embodiment provides an energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling. The first triode Q1 is an NMOS transistor. The gate of the first triode Q1 receives the analog signal, the drain of the first triode Q1 receives the voltage, and the source of the first triode Q1 provides voltage for the first inductor coil L1 of the transmitting module 101.

[0029] The modulation module 102 includes an oscillator U1. The oscillator U1 receives differential signals through the IN+ pin and the IN- pin, transforms and couples the signals through the CT pin, and is connected to the base of the second triode Q2 through the OUT A pin.

[0030] The collector of the second triode Q2 is connected to the first inductor coil L1.

[0031] The second triode Q2 transfers the modulated analog signal to the first inductor coil L1.

[0032] The first steady current capacitor C5 is connected in parallel across both ends of the first inductance coil L1.

[0033] During use, after the gate of the first triode Q1 of the transmitting unit 100 receives an analog signal, the first triode Q1 first converts the voltage received by the drain into a gate current through the first resistor R2, amplifies it into a source current, and then converts it into a voltage through the second resistor R3 and supplies it to the first inductance coil L1; after the modulation module 102 receives a differential signal through the IN+ pin and the IN- pin, it modulates the audio signal onto the PWM signal through the IN+ pin and the IN- pin to achieve digital encoding of the signal. The OSCOUT pin outputs a clock signal for controlling the timing of the PWM controller, transforms and couples the signal through the CT pin of the coupling transformer, and transmits the signal. The CT pin also provides electrical isolation to reduce noise and interference. During this process, the SYNC pin is used to control the disconnection of the signal, the DISC pin is used to control the enabling of the signal, the CMPEN pin is used to control the synchronization of the signal, and the RT is used to reset the circuit to ensure that the circuit state can be reset when needed. Finally, the output pins OUT A and OUT B are used to transmit the modulated signal to the first inductance coil L1. During this process, the capacitors C1, C2, C3, and C4 will all filter, couple, or decouple the signal simultaneously.

[0034] Embodiment 3

[0035] Referring to Figure 1 , this is the third embodiment of the present utility model. This embodiment provides an energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling. Its receiving module 201 includes a second inductance coil L2, and the second inductance coil L2 forms a resonance structure with the first inductance coil L1.

[0036] The second inductance coil L2 is connected to the signal receiving end 202 through a diode D1, and the second steady current capacitor C6 is connected in parallel across both ends of the second inductance coil L2.

[0037] In use, by means of far-field low-frequency electromagnetic coupling, the transmitting unit 100 and the receiving unit 200 resonate, causing a strong interaction between the transmitting module 101 and the receiving module 201. After the second inductance coil L2 in the receiving module 201 receives the electrical energy and modulation signal in the electromagnetic field, the obtained electrical energy is converted into a stable current through the rectifying circuit and the constant-current circuit to provide energy for the receiving unit 200. The rectifying circuit includes a diode D1. Due to the unidirectional conductivity of the diode D1, the AC input is converted into a DC output in the circuit, which is used to rectify the received AC signal and provide a DC power supply for the subsequent circuit. The constant-current circuit includes a second steady-current capacitor C6. The second steady-current capacitor C6 can store and release charges, thereby reducing the ripple and noise of the output voltage and stabilizing the output current to ensure a constant output current. Finally, the signal receiving end uses existing technologies to extract the signal characteristics, realizing energy transmission while enabling synchronous real-time signal transmission.

[0038] In summary, the signal is amplified through a designed circuit and then added to the energy transmission circuit. In this way, the energy can carry the characteristics of the signal during the transmission process. Therefore, this design can achieve synchronous transmission of energy and signal. At the receiving end, the signal demodulation work is realized through means such as high-pass filtering, and finally the received signal can be presented through external devices.

[0039] Embodiment 4

[0040] Referring to Figures 2 - 3 , which is the fourth embodiment of the present invention. This embodiment provides an energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling. Taking an audio signal as an example, the audio signal is used as the input voltage of the energy input (taking a sine signal as an example for easy observation). The obtained voltage curve is as shown in the appendix Figure 2 . It can be seen that the outer envelope of the energy curve is the input signal.

[0041] Taking audio as an example, since the carrier signal is much higher than the frequency of the audio signal, the audio signal can be represented by the envelope of the carrier signal. The required signal is only the envelope, while the carrier signal becomes a useless signal. At any moment in the appendix Figure 2 , this is the case. If output through a speaker, the voltage of the audio carrier reflected on the speaker is zero, and there is no signal output.

[0042] Appendix Figure 2 The first curve from top to bottom is the signal at the input end, the second curve is the signal curve after high-pass filtering, the third curve is the carrier signal used for our multi-signal modulation, and finally the fourth curve is generated as the energy signal of the transmitting coil and is transmitted to the receiving coil in the form of energy through electromagnetic coupling resonance.

[0043] Due to the rectification characteristic of the unidirectional conduction of diode D1, we can utilize this characteristic to remove the negative half of the signal amplitude, that is, only the positive half of the voltage value is left. What we get is a signal that is transmitted in half, but all the characteristics of the required signal are included in this half of the signal because the envelope of this half is symmetric with the removed other half, that is, the included signal characteristics are the same. Attached Figure 3 The outer envelope of the signal in the figure is the signal we transmit.

[0044] Embodiment 5

[0045] Refer to Figure 4 , which is the fifth embodiment of the present invention. This embodiment provides an energy signal hybrid transmission circuit for far-field low-frequency electromagnetic coupling. The energy transmission device is powered by a power supply. After being modulated by the modulation module 102 to generate a 20KHz voltage, it is input into the transmitting module 101. According to the magnetic resonance coupling resonance principle of the first inductor coil L1 and the second inductor coil L2, the energy is transmitted to the receiving end and drives the subsequent load after being processed. In signal transmission, the present invention uses an audio signal as the input signal and uses the input voltage in energy transmission as the carrier to perform amplitude modulation on the input signal. The signal modulated by the modulation module 102 is transmitted to the receiving module 201 in the form of energy. Then, the envelope line of the curve of the received energy frequency and amplitude changing with time is the useful signal.

[0046] In terms of energy transmission, with the transmitting coil powered, by adjusting the distance between the two coils, it can be found that the brightness of the load - LED lamp changes with the increase of the distance. Using a DC power supply to power the transmitting unit 100 to generate a high-frequency alternating voltage, the alternating voltage can transmit energy to the second inductor coil L2 in the way of magnetic coupling resonance of the modulation module 102. Intuitively, the distance of energy transmission can be judged by the brightness of the LED lamp, and the relationship between the transmission efficiency and the distance can be measured through measurement.

[0047] It can be measured that the longest transmission distance can reach 2 meters, which is longer in transmission distance and higher in efficiency compared with the wireless charging devices on the market.

[0048] In terms of signal transmission, the audio signal is modulated to the transmitting end through the audio input module and the signal is carried to the receiving end in the form of energy. The music signal is transmitted to the audio transmitting unit 100 through the audio player. Applying the principle of energy transmission, and energy can carry signals. We carry the signal in the energy at the transmitting end through the modulation of the modulation module 102. The signal is received by the signal receiving end 202, and through signal processing devices such as detection and filtering, the audio signal can be displayed through devices such as headphones and speakers. After connecting an external oscilloscope, the signal waveform directly displayed by the oscilloscope after being received at the receiving end. The obtained waveform is a clear and complete waveform, and the signal intensity is large, with no distortion or slightly distorted.

[0049] With the transceiver interval being 1 meter, analog signals of different frequencies are measured, and the measurement results are as follows in the table:

[0050] Table 1 Test Results of Input of Analog Signals with Different Frequencies

[0051]

[0052] The above table shows that in the case of a carrier frequency of 1.6 MHz, this utility model can complete the transmission of analog signals below 20 KHz without signal distortion at the receiving end and can restore the signal at the receiving end.

[0053] In summary, this utility model proposes a passive signal transmission method for far-field low-frequency electromagnetic coupling, which realizes the synchronous transmission of signals and energy over a relatively long distance. The first step is the energy transmission of far-field low-frequency electromagnetic coupling. In this process, an LED lamp is used as the load at the receiving end, and the change of the energy transmission efficiency with distance can be intuitively judged by observing the brightness of the lamp. The second step is to add signal transmission on the basis of the first step. Applying the principle of energy transmission, and since energy can carry signals, the signals are carried in the energy at the transmitting end through modulation. The signals received at the receiving end can be displayed through audio devices such as headphones and speakers by signal processing devices such as detection and filtering.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of substantially not deviating from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function in this disclosure, and not only structures that are equivalent but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangements of the exemplary embodiments without departing from the scope of this utility model. Therefore, this utility model is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0055] In addition, to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently contemplated best mode of implementing the present utility model or those features that are not relevant to the implementation of the present utility model).

[0056] It should be understood that, in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, fabrication, and production.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered by the scope of the claims of the present utility model.

Claims

1. A far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit, characterized in that: include, A transmitting unit (100) comprises a transmitting module (101), a modulating module (102), a first triode (Q1) and a second triode (Q2), wherein the first triode (Q1) receives an analog signal and provides an input voltage to the transmitting module (101), and the modulating module (102) generates a frequency square wave and sends it to the transmitting module (101) via the second triode (Q2); The receiving unit (200) comprises a receiving module (201) and a signal receiving end (202), wherein the receiving module (201) receives the electric energy and the modulated signal from the transmitting module (101), and the signal receiving end (202) extracts features from the electric energy and the modulated signal.

2. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 1, characterized in that: The first transistor (Q1) is an NMOS transistor, the gate of the first transistor (Q1) receives an analog signal, the drain of the first transistor (Q1) receives a voltage, and the source of the first transistor (Q1) provides a voltage for a first inductor (L1) of the transmitting module (101).

3. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 2, characterized in that: The modulation module (102) comprises an oscillator (U1), which receives a differential signal through an IN+ pin and an IN- pin, transforms and couples the signal through a CT pin, and is connected to the base of the second transistor (Q2) through an OUT A pin.

4. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 3, characterized in that: The collector of the second transistor (Q2) is connected to the first inductor (L1).

5. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 4, characterized in that: The second transistor (Q2) transmits the modulated analog signal to the first inductor (L1).

6. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 5, characterized in that: The first current stabilizing capacitor (C5) is connected in parallel to both ends of the first inductor (L1).

7. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 6, characterized in that: The receiving module (201) comprises a second inductor (L2), and the second inductor (L2) forms a resonant structure with the first inductor (L1).

8. The far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit according to claim 7, characterized in that: The second inductor (L2) is connected to the signal receiving end (202) via a diode (D1), and a second current-stabilizing capacitor (C6) is connected in parallel to both ends of the second inductor (L2).

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