CN113055055B - Method and system for realizing near field communication based on converter inductance or transformer leakage inductance - Google Patents
Method and system for realizing near field communication based on converter inductance or transformer leakage inductance Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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Abstract
The invention discloses a method and a system for realizing near field communication based on the leakage inductance of a converter inductor or a transformer, wherein the converter at least comprises an inductor or transformer element A1 and a switching device, and the converter transmits modulated information to the current of the inductor or transformer element A1 through a switching device driving signal modulated by power/information composite PWM and transmits the modulated information to an external space in a near field magnetic field mode. And finally, receiving data by detecting the near-field magnetic field. The near field communication can be realized by modulating data of the power electronic converter, the power and information can be decoupled by the signal receiving end without adding a capacitor, and the number of the signal receiving ends is not strictly limited. On the basis, various data modulation modes can be realized, including FSK, PSK, DPSK, FH-DPSK modulation and the like.
Description
Technical Field
The invention belongs to the technical field of wireless near field communication, and particularly relates to a method and a system for realizing near field communication based on a converter inductor or a transformer leakage inductor.
Background
With the development of information technology, information communication networks have gradually extended to a wider physical world, and the rise and development of the internet of things require that various electric devices and other external devices can perform data communication. To simplify the electrical connection, data transmission may be implemented using power line carrier communication (PLC). However, the traditional PLC communication needs additional signal modulation and demodulation circuits, which increases the complexity of the circuit, and for small-power and small-volume devices, the additional circuits are added, which reduces the power density and cost performance of the device. At present, a power electronic circuit can be used to modulate a digital signal on a driving signal of a switching device, thereby realizing a PLC communication function. Compared with the traditional PLC communication technology, the technical scheme has the advantage that no additional PLC modulation circuit is needed.
The chinese patent with application number 201210055396.0 proposes a design scheme for synchronous transmission of energy and information by using switching ripples at the input and output sides of a converter power supply, and realizes carrier communication by using the switching ripples to transmit information for a plurality of Boost circuits with parallel inputs. The literature (Wujiade, Du Chi, Wang Rui, Li Chu, He Xiang Ning, Power line communication technology [ J ] electrotechnical Commission 2014,04: 166-; the literature (Xiangning He, Ruichi Wang, Jiande Wu, Wuhua Li. Nature of power electronics and integration of power conversion with communication for communicating power [ J ]. Nature Communications,2020) proposes a Frequency-Hopping Differential-Phase-Shift-Keying (FH-DPSK) modulation scheme for multilevel DPSK modulation of PWM carriers.
However, in the above patent and literature, both the signal transmitting end and the signal receiving end are electrically connected, and belong to wired communication, and if there is no electrical connection between the signal generating apparatus and the signal receiving apparatus, information cannot be transmitted. In addition, the signal receiving end needs to utilize a blocking capacitor to achieve decoupling of power and a digital signal, and when multiple paths of signal receiving ends exist, the signal receiving end needs to achieve signal receiving through multiple paths of connecting lines. Therefore, if a universal wireless data communication method and a universal wireless data communication system are designed for the power electronic converter, power and information do not need to be decoupled, and the number of receiving ends is not strictly limited, the application range of the energy information composite transmission technology can be greatly expanded.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a method and a system for implementing near field communication based on transformer inductance or transformer leakage inductance, which can simplify the dc blocking capacitance of the signal receiving end and has no strict limitation on the number of receiving ends.
The converter at least comprises an inductance or transformer element A1 and a switching device, and the converter transfers modulated information to the current of the inductance or transformer element A1 through a switching device driving signal modulated by power/information composite PWM and transmits the modulated information to an external space in a near-field magnetic field mode. And finally, receiving data by detecting the near-field magnetic field.
Further, the power electronic converter circuit comprises Buck, Boost, Buck-Boost, Flyback and the like.
Furthermore, the power electronic converter circuit adopts power/information composite PWM modulation, directly modulates a digital signal on a driving signal of a switching device, and does not need to add an additional device or circuit for generating and sending the signal. The modulation method comprises digital modulation methods such as FSK, PSK, DPSK, FH-DPSK and the like.
Furthermore, the signal receiving circuit comprises a magnetic field sensor, a signal conditioning and filtering circuit and a demodulation circuit. Wherein the magnetic field sensor may employ a coil, a tunneling magneto-resistive sensor (TMR), or a hall element. The signal conditioning and filtering circuit amplifies and processes the received signal, and then the data is obtained through the demodulation circuit.
A system for implementing near field communication based on converter inductance or transformer leakage inductance includes a power electronic converter and a signal receiving circuit. Wherein:
the power electronic converter at least comprises an inductance or transformer element A1 and a switching device, and the converter transmits modulated information to the current of A1 through a switching device driving signal modulated by power/information composite PWM and transmits the information to an external space in a near-field magnetic field mode.
The signal receiving circuit comprises a magnetic field sensor, a signal conditioning and filtering circuit and a demodulation circuit and is used for detecting the magnetic field to realize the data receiving.
The invention provides a method and a system for realizing information modulation and wireless communication by utilizing inductance or transformer leakage inductance in a power electronic converter, which can modulate data of the power electronic converter, and a signal receiving end does not need to utilize a blocking capacitor to realize decoupling of power and a digital signal, thereby realizing various data modulation modes including FSK, PSK, DPSK, FH-DPSK modulation and the like. Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention can realize near field communication by utilizing the power electronic converter.
2. The signal receiving end in the invention does not need to add a capacitor to decouple the power and the information.
3. The invention has no strict limitation on the number of the signal receiving ends, and one signal transmitting end can simultaneously transmit signals to a plurality of signal receiving ends.
Drawings
Fig. 1 is a block diagram of a system for implementing near field communication based on a transformer inductance or a transformer leakage inductance.
Fig. 2 is a schematic diagram of the principle of power/information composite PWM modulation.
Fig. 3 is a schematic diagram of the current peak control principle of the Flyback converter.
Fig. 4 is a schematic diagram of the Flyback current peak control principle with the receiver circuit.
Fig. 5 is a schematic diagram of PSK modulation.
Fig. 6 is a schematic diagram of FSK modulation.
Fig. 7 is a schematic diagram of a flyback circuit.
FIG. 8 is a gate waveform with time on the horizontal axis and amplitude on the vertical axis for signal transmission.
Fig. 9 is a waveform of an inductor current corresponding to a gate waveform when a signal is transmitted, in which the horizontal axis represents time and the vertical axis represents amplitude.
Fig. 10 is a graph of the output voltage waveform of the receiving-end signal conditioning circuit, wherein the horizontal axis is time and the vertical axis is amplitude.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
Fig. 1 is a block diagram of a system for implementing near field communication based on a converter inductance or a transformer leakage inductance, which includes a power electronic converter, a controller and a signal receiving circuit. Wherein: the power electronic converter at least comprises an inductance or transformer element A1 and a switching device, and the converter transmits modulated information to the current of A1 through a switching device driving signal modulated by power/information composite PWM and transmits the information to an external space in a near-field magnetic field mode.
The signal receiving circuit comprises a magnetic field sensor, a signal conditioning and filtering circuit and a demodulation circuit and is used for detecting the magnetic field to realize the data receiving.
The method for realizing data modulation comprises the steps that the power electronic converter adopts power/information composite PWM modulation, namely, the power is adjusted through the duty ratio, and meanwhile, data modulation is carried out on PWM pulses. Using FSK modulation method as an example, the circuit uses two different frequencies f0And f1By f0Representing data "0" or no data to send, f1Representing data "1".
The method for realizing data transmission comprises that a power electronic circuit at least comprises an inductance or transformer element A1 and a switching device, and a digital signal is directly modulated on a gate driving signal of the switching device by a controller of a converter, so that the modulated information is transferred to a current of A1 and is transmitted to an external space in a near-field magnetic field mode. The signal receiving circuit comprises a magnetic field sensor, a signal conditioning and filtering circuit and a demodulation circuit, and data receiving is realized by detecting the magnetic field.
The invention being implemented as a method of demodulating data, i.e. frequency f of modulated data1Operating frequency f of power circuit0The voltage signals received by the signal receiver are demodulated by adopting discrete Fourier transform, and the original signals on the time domain can be restored.
Therefore, the power/information composite PWM modulation is carried out on the driving signal of the power electronic converter, and the near-field magnetic field generated in the space by the inductor or the transformer leakage inductor is utilized for transmission, so that the near-field wireless ripple communication function is realized. The data modulation is further described below with reference to specific embodiments.
Schematic diagram of a power/information composite PWM modulator with average current control using FSK data modulation is shown in fig. 2, with control vtri(t) a signal for varying the frequency of the PWM drive signal to modulate data by controlling vcAnd (t) a signal for modulating the power by changing the duty ratio of the PWM driving signal. FIG. 6 is a schematic diagram of FSK, in which digital information is represented by the frequency of a carrier wave, and FIG. 6 is a 2-ary FSK scheme using two FSK channelsThe carriers with different frequencies represent different digital signals, and the frequency of the carrier is always kept unchanged during the transmission of the same digital signal. Taking a conventional Flyback circuit as an example, a power/information composite PWM modulation circuit that performs peak current control by FSK modulation is shown in fig. 3, and the circuit includes a power control module, a data modulation module, an RS flip-flop, a driver, and a power circuit composed of a switching device in an electronic converter, an inductor or a transformer element a1, where the data modulation module modulates a carrier to generate a clock signal, the clock signal is input to the RS flip-flop together with power control information output by the power control module to generate a gate signal, and the gate signal controls the switching device after passing through the driver. The data modulation module modulates data by adopting different carrier frequencies, the power control module comprises a voltage ring error amplifier and a comparator, a current reference quantity is obtained by the voltage reference quantity and the output voltage of the power circuit through the error amplifier, and then the duty ratio of a gate pole signal is controlled by the current reference quantity and a current sampling value (a current signal of the power circuit collected by the circuit sensor) through the comparator to modulate power. The structure diagram of wireless communication by using the inductor or the transformer leakage inductor in the invention is shown in fig. 4, and the signal receiving circuit in fig. 4 is a circuit without electrical connection with the signal modulation circuit.
Fig. 5 is a schematic diagram of PSK, in which digital information is represented by the phase of a carrier, and in fig. 5, 2-ary PSK represents different digital signals by taking two different phases of the carrier, and the phase of the carrier is always kept constant during the same digital signal. Data modulation may also be implemented.
The following is a specific example implemented according to the present invention, in which the power electronic converter employs a flyback circuit having a structure shown in fig. 7, an LC resonance type detection circuit is used to detect a near-field magnetic field, and circuit parameters of the flyback converter are shown in table 1:
TABLE 1
| Parameter(s) | Numerical value | Parameter(s) | Numerical value |
| Vdc | 300V | Output voltage | 20V |
| R1 | 16Ω | M1 excitation inductance | 900μH |
| C1 | 470μF | M1 leakage inductance | 18μH |
| R2 | 72kΩ | M1 original and secondary turn ratio | 9:1 |
| C2 | 10nF |
When the switching frequency of the converter is switched from 100kHz to 83.3kHz by the driving signal, the control circuit shown in fig. 3 is adopted, the gate waveform diagram during signal transmission is shown in fig. 8, the waveform of the inductive current corresponding to the gate waveform is shown in fig. 9, the waveform diagram of the voltage of the receiving end signal conditioning circuit is shown in fig. 10, and the voltage signal of the signal conditioning circuit is demodulated to restore the original signal in the time domain.
The foregoing description of the embodiments is provided to enable one of ordinary skill in the art to make and use the invention, and it is to be understood that other modifications of the embodiments, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty, as will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (4)
1. The method for realizing near field communication based on the transformer inductance or the transformer leakage inductance is characterized in that: the converter at least comprises an inductor and a switching device or at least comprises a transformer element (A1) and a switching device, the converter adopts power and information composite PWM modulation, directly modulates a digital signal on a driving signal of the switching device, further transmits the modulated information to the current of the inductor or the transformer element (A1), and transmits the modulated information to an external space in a near-field magnetic field mode; and finally, receiving data by detecting the near-field magnetic field, wherein the modulation method is FSK modulation, PSK modulation, DPSK modulation or FH-DPSK modulation.
2. The method of claim 1, wherein: the converter is a Buck converter, a Boost converter, a Buck-Boost converter or a Flyback converter.
3. The method of claim 1, wherein: receiving data by detecting the near-field magnetic field, specifically: detecting the near-field magnetic field reception signal with a magnetic field sensor, wherein the magnetic field sensor employs a coil, a tunnel magnetoresistive sensor (TMR), or a hall element; and then, amplifying and processing the received signals by using a signal conditioning and filtering circuit, and finally, acquiring data through a demodulation circuit.
4. System based on converter inductance or transformer leakage inductance realization near field communication, its characterized in that: the system comprises a power electronic converter, a controller and a signal receiving circuit; wherein:
the power electronic converter at least comprises an inductor and a switching device or at least comprises a transformer element (A1) and a switching device, the converter transfers modulated information to the current of the inductor or the transformer element (A1) through a switching device driving signal modulated by power and information composite PWM, and the modulated information is transmitted to an external space in a near-field magnetic field mode;
the signal receiving circuit comprises a magnetic field sensor, a signal conditioning and filtering circuit and a demodulation circuit and is used for detecting the magnetic field to realize the data receiving.
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| CN103368609A (en) * | 2013-06-21 | 2013-10-23 | 浙江大学 | Coupling inductance-based power signal composite transmission system |
| CN104158305A (en) * | 2014-07-30 | 2014-11-19 | 华南理工大学 | Energy and information synchronous transmission system based on self-adaptive magnetic coupling resonance matching |
| CN104184492A (en) * | 2014-07-31 | 2014-12-03 | 中国农业大学 | Method and apparatus for realizing composite communication of power and communication signals in electric power system |
| CN112398340A (en) * | 2020-10-27 | 2021-02-23 | 浙江大学 | Switching frequency switching and data modulation method and control system for peak current control mode |
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| US9301365B2 (en) * | 2012-11-07 | 2016-03-29 | Express Imaging Systems, Llc | Luminaire with switch-mode converter power monitoring |
| CN103957033A (en) * | 2014-05-12 | 2014-07-30 | 东南大学 | Communication-line-free data transmission method between power electronic devices based on composite modulation |
| CN104578802B (en) * | 2015-01-20 | 2017-06-16 | 北京理工大学 | A kind of optimal current waveform control method of the two-way DC DC converters of current mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368609A (en) * | 2013-06-21 | 2013-10-23 | 浙江大学 | Coupling inductance-based power signal composite transmission system |
| CN104158305A (en) * | 2014-07-30 | 2014-11-19 | 华南理工大学 | Energy and information synchronous transmission system based on self-adaptive magnetic coupling resonance matching |
| CN104184492A (en) * | 2014-07-31 | 2014-12-03 | 中国农业大学 | Method and apparatus for realizing composite communication of power and communication signals in electric power system |
| CN112398340A (en) * | 2020-10-27 | 2021-02-23 | 浙江大学 | Switching frequency switching and data modulation method and control system for peak current control mode |
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