CN112531922A - Information feedback system based on space scale-time symmetric circuit - Google Patents
Information feedback system based on space scale-time symmetric circuit Download PDFInfo
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- CN112531922A CN112531922A CN202011312266.1A CN202011312266A CN112531922A CN 112531922 A CN112531922 A CN 112531922A CN 202011312266 A CN202011312266 A CN 202011312266A CN 112531922 A CN112531922 A CN 112531922A
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses an information feedback system based on an astronomical-time symmetric circuit, which comprises a receiving end, a transmitting end, a negative resistor, a feedback resistor, a gain resistor and a load resistor, wherein the receiving end is connected with the transmitting end through a line; one end of the transmitting end and one end of the receiving end realize wireless transmission of energy and information through a transmitting end circuit and a receiving end resonant circuit, the receiving end resonant circuit is a circuit designed through a frequency branch transformation mechanism, and the receiving end resonant circuit comprises a receiving end coil inductor, a first capacitor, a second capacitor, a third capacitor, a normally open switch and a normally closed switch; the inductor is connected with the first capacitor in parallel; the second capacitor is connected with the normally closed switch in series and then connected with the first capacitor in parallel, and the third capacitor is connected with the normally open switch in series and then connected with the first capacitor in parallel; the capacitors are used for setting the natural resonant frequency of the receiving end resonant circuit; two switches are used for switching the working frequency branch of the system; the system realizes efficient information reverse transmission and can stably transmit energy.
Description
Technical Field
The invention relates to an information feedback system, in particular to an information feedback system based on an astronomical-time symmetric circuit.
Background
With the rapid development of scientific technology, the overall performance and safety of wireless power transmission systems are continuously improved. The transmitting and receiving ends of the energy generally need to be synchronized and coordinated, and therefore often require both the transmitting and receiving parties to communicate in real time. The functions of voltage feedback control, load tuning, state monitoring, automatic tuning, multi-controller synchronization and the like in the wireless power transmission system are easier to realize if the bidirectional transmission of system information can be realized. In the fields of military information crosslinking, implantable medical equipment, sensor networks and the like, the wireless information bidirectional transmission is the fundamental purpose.
Through the research of a large number of documents, various schemes are available for selection, and compared with a classical high-frequency carrier method, the system can superpose a high-frequency signal on an energy signal at an information sending end and extract information from the energy signal at an information receiving end by using a filter. The other system is an energy/information frequency division multiplexing method, and the method enables a wireless power transmission system to have two different resonance frequency points by designing a specific circuit structure, so that energy and information are transmitted respectively by using two frequencies, the system is small in size and cost, interference between the energy and the information is small, and the information and the energy cannot be transmitted simultaneously. There are also, for example, harmonic communication methods that communicate using an input current having a particular waveform with a fundamental component for transmitting system energy and a higher harmonic component for transmitting information, which can deliver both energy and information simultaneously without the need for additional circuitry. It can be said that the information forward transmission technology of the wireless power transmission system is mature, so the patent does not relate to the forward transmission technology. The importance of information feedback as key content in information bidirectional transmission is self-evident, and some existing wireless information feedback schemes increase the system coupling complexity and cannot transmit energy and information simultaneously by adding a signal coil. Some of the systems perform signal modulation through a compensation capacitance value and realize information feedback through detecting the current amplitude and the characteristics of a transmitting end, and the disadvantages are that the change of the compensation capacitance value of a coil can increase the leakage inductance of the coil and reduce the energy transfer efficiency of the system.
Disclosure of Invention
The invention aims to provide an information feedback system based on an astronomical-time symmetric circuit, which ensures the reception of energy, realizes efficient information reverse transmission and can stably transmit energy.
The technical scheme for realizing the purpose of the invention is as follows: an information feedback system based on an astronomical-time symmetric circuit, comprising: the device comprises a receiving end, a transmitting end, a negative resistor, a feedback resistor, a gain resistor and a load resistor; wherein:
one end of the sending end and one end of the receiving end realize wireless transmission of energy and information through a sending end circuit and a receiving end resonant circuit;
the negative resistor consists of a resistor and an operational amplifier and is used for converting part of direct current provided by a power supply into alternating current to supply power to the system; the feedback resistor is a feedback resistor of the operational amplifier, and the gain resistor is a gain resistor of the operational amplifier; the feedback resistor and the gain resistor are used for changing the voltage amplification factor of the linear non-saturation region of the operational amplifier;
the transmitting end circuit is a transmitting end coil inductor and capacitor parallel circuit, one end of the parallel circuit is grounded, and the other end of the parallel circuit is connected with a resistor; the capacitor is used for setting the natural resonant frequency of the transmitting end circuit;
the receiving end resonance circuit comprises a receiving end coil inductor, a first capacitor, a second capacitor, a third capacitor, a normally closed switch and a normally open switch; the receiving end coil inductor is connected with the first capacitor in parallel; the second capacitor is connected with the normally closed switch in series and then connected with the first capacitor in parallel, and the third capacitor is connected with the normally open switch in series and then connected with the first capacitor in parallel; first capacitor, second capacitor and third capacitorThe resonance circuit is used for setting the natural resonance frequency of the resonance circuit of the receiving end; the normally closed switch and the normally open switch are used for switching the working frequency branch of the system and changing the offset c of the natural frequency of the receiving end and the transmitting endc；
The receiving end resonant circuit is connected with a load resistor.
Furthermore, the system works in a strong coupling area and has different frequency branches, wherein the high-frequency branch period T is 0.98 mu s, and the low-frequency branch period T is 1.02 mu s.
Furthermore, the system is uncontrollably positioned in a high-frequency branch or a low-frequency branch when being electrified, and the voltage amplitudes of two ends of the coil inductor of the transmitting end and the coil inductor of the receiving end are basically the same after the system is stabilized no matter the high-frequency branch or the low-frequency branch.
Further, the system sets the high frequency branch to represent a "1" and the low frequency branch to represent a "0" for energy and information transfer.
Furthermore, the transmitting terminal and the receiving terminal are connected with an oscilloscope for displaying voltage waveforms.
Further, the first capacitance value is 2.3nF, the second capacitance value is 0.62nF, and the third capacitance value is 2.8 nF.
Further, the wireless transmission of energy and information may be performed simultaneously in a single channel.
Further, the offset ccComprises the following steps:
wherein the content of the first and second substances,
the capacitance value of the matching capacitor of the receiving end under the condition of complete symmetry is satisfied, namely
Satisfies the following conditions:
l1、l2the inductance values of the transmitting-side coil inductance and the receiving-side coil inductance, c1When the normally closed switch is turned off and the normally open switch is turned off, c is the capacitance of the transmitting end capacitor3Equal to the first capacitance value; when the normally closed switch is closed and the normally open switch is open, c3The capacitance value is equal to the capacitance value of the first capacitor and the capacitance value of the second capacitor which are connected in parallel; when the normally-closed switch is turned off and the normally-open switch is turned on, c3The capacitance value is equal to the capacitance value of the first capacitor and the capacitance value of the third capacitor which are connected in parallel; when the normally-closed switch is closed, c3Equal to the capacitance value of the first capacitance value, the second capacitance value and the third capacitance value which are connected in parallel.
Compared with the prior art, the invention has the following remarkable advantages: (1) the frequency modulation mode of the invention is not only short in detuning time, but also can receive less energy at the moment of switching between the two states no matter whether the '0' or the '1' is in the resonance state of the system, thereby further ensuring the energy reception and realizing efficient information reverse transmission; (2) the invention can stably transmit energy, and the system has simple and reliable structure.
Drawings
Figure 1 is a circuit diagram of a nonlinear PT symmetric WPT system.
Figure 2 is a frequency jump versus hysteresis graph for a non-linear PT symmetric WPT system under imperfect symmetry conditions.
Fig. 3 is a circuit diagram of the resonance control of the receiving end in the present invention.
Fig. 4 is a waveform diagram of an oscilloscope of an experiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The information feedback system provided by the invention is based on a known nonlinear PT symmetrical WPT system (space symmetry-time symmetrical circuit), the nonlinear PT symmetrical WPT system is shown as figure 1, and the resistorR1And the negative resistor and the operational amplifier form a negative resistor, and the negative resistor is used for converting part of direct current provided by the power supply into alternating current to supply power for the WPT system. Then the resistance R1And a transmitting terminal capacitance C1And a transmitting end coil inductance L1Connected, transmitting end capacitor C1Two sides of the inductor are respectively connected with the transmitting end coil1And a resistance R1To each other, RFIs the feedback resistance of the operational amplifier, RGIs the gain resistance of the operational amplifier by design RFAnd RGTo achieve a voltage amplification of the linear (non-saturated) region of the operational amplifier. R2Is the load resistance at the receiving end. L is1And L2The coil inductances of the transmitting end and the receiving end are respectively, and M is the mutual inductance of the two coils. RL1And RL2Respectively, the internal resistances of the coils of the transmitting end and the receiving end. C1And C2Matching capacitors at the transmitting end and the receiving end respectively for setting the natural resonant frequency, C, of the transmitting and receiving loops2And R2And is coupled to L2One side of (A), RL2Is connected to L2To the other side of the same. V1And V2Voltages across the coils, I, of the transmitting and receiving terminals, respectively1And I2The currents flowing in the coils of the transmitting end and the receiving end respectively.
Fig. 2 analyzes frequency hopping and hysteresis phenomena in a nonlinear PT symmetric WPT system, when two coils change from near to far, if the system is in a high-frequency branch before, the operating frequency of the system jumps at a critical position and switches to a low-frequency branch, and if the distance between the two coils is further reduced slowly, the operating frequency of the system gradually decreases along the low-frequency branch instead of returning to the high-frequency branch at the critical position, and an offset c is definedc：
Wherein the content of the first and second substances,
is to satisfyThe capacitance value of the matching capacitor at the receiving end in the case of perfect symmetry, i.e.
Satisfies the following conditions:
l1、l2the inductance values of the transmitting-side coil inductance and the receiving-side coil inductance, c1For the capacitance value of the transmitting-side capacitance, c for the case of perfect symmetryc0. As shown in fig. 2, when the coupling coefficient k is 0.073, if the resonant frequency of the system is in the high-frequency branch ω30When, with ccThe resonant frequency of the system will follow the high frequency branch omega30Climbing continuously, when the offset is reduced to CC1While the system operating frequency jumps to the low frequency branch omega10The above. If the offset is increased, the system operating frequency will follow the low frequency branch ω10Continuing to move, and similarly, the system is in the low-frequency branch omega10When the offset is increased, the working frequency of the system is continuously downslope, and when the offset is increased to CC2While the system operating frequency jumps to the high frequency branch omega30The above. When the offset is reduced, the system operating frequency will follow the high frequency branch ω30Continue moving
FIG. 3 is an information feedback system based on an astronomical-time symmetric circuit of the present invention, in which a receiving end resonant circuit designed by a frequency branch transition mechanism is used at the receiving end, and the rest is the same as the well-known nonlinear PT symmetric WPT system circuit; namely, the method comprises the following steps: receiving end, transmitting end, negative resistor and feedback resistor RFGain resistor RGAnd a load resistance R2(ii) a Wherein: one end of the sending end and one end of the receiving end realize wireless transmission of energy and information through the sending end circuit and the receiving end resonant circuit; resistance R1The negative resistor and the operational amplifier form a negative resistor and are used for converting part of direct current provided by the power supply into alternating current to supply power to the system; rFIs the feedback resistance of the operational amplifier, RGIs the gain resistance of the operational amplifier; rFAnd RGThe voltage amplification factor is used for changing the linear non-saturation region of the operational amplifier; the transmitting end circuit is a transmitting end coil inductor L1And a transmitting terminal capacitance C1A parallel circuit with one end connected to ground and the other end connected to a resistor R1Connecting; transmitting terminal capacitance C1Used for setting the natural resonant frequency of the transmitting end circuit; the receiving end resonant circuit is connected with a load resistor R2(ii) a Transposed energy and information transfer can occur simultaneously over a single channel.
The receiving end resonance circuit comprises a receiving end coil inductor L2A first capacitor C20A second capacitor C21A third capacitor C22Normally closed switch S1And a normally open switch S2(ii) a The receiving end coil inductance L2And a first capacitor C20Parallel connection; second capacitor C21And a normally closed switch S1Connected in series and then connected to a first capacitor C20Parallel connection, a third capacitor C22And normally open switch S2Connected in series and then connected to a first capacitor C20Parallel connection; a first capacitor C20A second capacitor C21And a third capacitance C22The resonance frequency setting circuit is used for setting the natural resonance frequency of the receiving end resonance circuit; by means of a normally-closed switch S1And normally open switch S2The method is used for connecting or disconnecting the capacitor of the receiving end, so that the offset rate of two ends of the system is changed, the offset rate reaches a critical value, the frequency hopping is realized, the aim of controlling the resonant frequency of the system is fulfilled, the frequency discrimination result of the transmitting end can reflect the change of high and low frequencies in real time, and the high and low frequencies of the system are used for representing '1' and '0' to realize the feedback of information.
By controlling switch S1And S2Connecting or disconnecting a capacitor C21And C22To change the offset c of the inherent frequency of the receiving end and the transmitting endcAs shown in FIG. 3, said
Wherein the content of the first and second substances,
the capacitance value of the matching capacitor of the receiving end under the condition of complete symmetry is satisfied, namely
Satisfies the following conditions:
l1、l2is a transmitting end coil inductance L1And a receiving end coil inductance L2Inductance value of c1As a transmitting terminal capacitance C1A normally closed switch S1Open, normally open switch S2When disconnected, c3Is equal to the first capacitance C20A capacitance value; normally closed switch S1Closed, normally open switch S2When disconnected, c3Is equal to the first capacitance C20A capacitance value of a second capacitor C21Capacitance values of the capacitance values in parallel connection; normally closed switch S1Open, normally open switch S2When closing, c3Is equal to the first capacitance C20Capacitance value, third capacitance C22Capacitance values of the capacitance values in parallel connection; normally closed switch S1Closed, normally open switch S2When closing, c3Is equal to the first capacitance C20A capacitance value, a second capacitance C21A capacitance value and a third capacitance C22The capacitance value of the capacitance value is connected in parallel.
The system mainly induces the system to select high-frequency or low-frequency branches according to a control circuit on a receiving circuit, voltage waveforms of a transmitting end and a receiving end on an oscilloscope are observed, so that the voltage at two ends of a transmitting coil is basically kept unchanged, and obvious oscillation starting and stopping can exist at the moment of detuning of the voltage at two ends of a receiving coil.
As shown in FIG. 4, the transmitting end and the receiving end V of the system are measured by an oscilloscope1And V2To observe the information feedback effect, the receiving end control circuit is configured as follows: the first capacitor C20A capacitance value of 2.3nF, a second capacitance C21A capacitance value of 0.62nF, a third capacitance C21The capacitance is 2.8nF, and it can be seen that after the system is powered on, the high frequency branch is selected, and the period T is 0.98 μ s, which is uncontrollable. But after the first and second switching, the system selects the low frequency (period T1.02 μ s) and high frequency branch (period T0.98 μ s), respectively, consistent with theoretical analysis, and V stabilizes after stabilization, whether high or low frequency branch1And V2The amplitudes are basically the same, and energy transmission is guaranteed.
The specific operation mode of the device is as follows:
1. a nonlinear PT symmetrical WPT system is built, and a receiving end is connected with two capacitors in parallel respectively through a normally open switch and a normally closed switch to form a resonant circuit.
2. When the circuit is powered on, the system works in a strong coupling state, when the system reaches a complete resonance state for the first time, the frequency of the branch is uncontrollable at a high frequency or a low frequency, and then the load capacity value of a receiving end (namely the offset rate of two transmitting and receiving ends) can be changed by controlling the switch of the receiving end circuit so as to switch the working frequency branch of the system.
3. Along with the change of the offset rate of the two ends of the system back and forth on two critical values, the working frequency of the system is switched back and forth on the high-frequency branch and the low-frequency branch, and the '0' or '1' sent by the receiving end can be obtained in real time through the frequency discrimination result of the transmitting end.
Through the operation of the steps, the purpose of transmitting signals from the receiving end to the transmitting end is achieved.
Claims (8)
1. An information feedback system based on an astronomical-time symmetric circuit, comprising: receiving terminal, transmitting terminal, negative resistance, feedback resistance (R)F) Gain resistance (R)G) And a load resistance (R)2) (ii) a Wherein:
one end of the sending end and one end of the receiving end realize wireless transmission of energy and information through a sending end circuit and a receiving end resonant circuit;
the negative resistance is formed by a resistance (R)1) The operational amplifier is used for converting part of direct current provided by the power supply into alternating current to supply power to the system; feedback resistance (R)F) Is thatFeedback resistance, gain resistance (R) of operational amplifierG) Is the gain resistance of the operational amplifier; feedback resistance (R)F) And a gain resistor (R)G) The voltage amplification factor is used for changing the linear non-saturation region of the operational amplifier;
the transmitting end circuit is a transmitting end coil inductor (L)1) And the transmitting terminal capacitance (C)1) A parallel circuit having one end connected to ground and the other end connected to a resistor (R)1) Connecting; transmitting terminal capacitance (C)1) Used for setting the natural resonant frequency of the transmitting end circuit;
the receiving end resonance circuit comprises a receiving end coil inductor (L)2) A first capacitor (C)20) A second capacitor (C)21) A third capacitor (C)22) Normally closed switch (S)1) And a normally open switch (S)2) (ii) a The receiving end coil inductance (L)2) And a first capacitance (C)20) Parallel connection; a second capacitance (C)21) And a normally closed switch (S)1) Connected in series and then connected to a first capacitor (C)20) Parallel, third capacitance (C)22) And normally open switch (S)2) Connected in series and then connected to a first capacitor (C)20) Parallel connection; a first capacitor (C)20) A second capacitor (C)21) And a third capacitance (C)22) The resonance frequency setting circuit is used for setting the natural resonance frequency of the receiving end resonance circuit; normally closed switch (S)1) And normally open switch (S)2) For switching the working frequency branch of the system, and changing the offset c of the natural frequency of the receiving end and the transmitting endc；
The receiving end resonant circuit is connected with a load resistor (R)2)。
2. The information feedback system of claim 1, wherein the system operates in a strong coupling region and has different frequency branches, and the high frequency branch period T is 0.98 μ s, and the low frequency branch period T is 1.02 μ s.
3. The information feedback system of claim 2, wherein the system is uncontrollably powered on in either the high frequency branch or the low frequency branch, whether the high frequency branch or the low frequency branchBranch, stabilized back transmitter coil inductance (L1) and receiver coil inductance (L)2) The voltage amplitudes at both ends are the same.
4. The information feedback system of claim 2, wherein the system sets the high frequency branch to represent a "1" and the low frequency branch to represent a "0" for energy and information transmission.
5. The information feedback system of claim 1, wherein the transmitting terminal and the receiving terminal are connected to an oscilloscope for displaying voltage waveforms.
6. Information feedback system according to claim 1, characterized in that the first capacitance (C)20) Capacitance value of 2.3nF, second capacitance (C)21) Capacitance value of 0.62nF, third capacitance (C)22) The capacitance value is 2.8 nF.
7. The information feedback system of claim 1, wherein said wireless transmission of energy and information is performed simultaneously in a single channel.
8. The information feedback system of claim 1, wherein the offset c iscComprises the following steps:
wherein the content of the first and second substances,
the capacitance value of the matching capacitor of the receiving end under the condition of complete symmetry is satisfied, namely
Satisfies the following conditions:
l1、l2is a transmitting end coil inductance (L)1) And receiving end coil inductance (L)2) Inductance value of c1Is a transmitting terminal capacitance (C)1) Capacitance value of (2), normally closed switch (S)1) Open, normally open switch (S)2) When disconnected, c3Is equal to the first capacitance (C)20) A capacitance value; normally closed switch (S)1) Closed, normally open switch (S)2) When disconnected, c3Is equal to the first capacitance (C)20) Capacitance value, second capacitance (C)21) Capacitance values of the capacitance values in parallel connection; normally closed switch (S)1) Open, normally open switch (S)2) When closing, c3Is equal to the first capacitance (C)20) Capacitance value, third capacitance (C)22) Capacitance values of the capacitance values in parallel connection; normally closed switch (S)1) Closed, normally open switch (S)2) When closing, c3Is equal to the first capacitance (C)20) A capacitance value, a second capacitance (C)21) A capacitance value and a third capacitance (C)22) The capacitance value of the capacitance value is connected in parallel.
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| WO2024055501A1 (en) * | 2022-09-15 | 2024-03-21 | 东南大学 | Frequency-adjustable non-reciprocal transmission system based on pt symmetry principle and detection method therefor |
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