CN117811232A - Communication method for wireless electric energy information cooperative transmission system - Google Patents
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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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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
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Abstract
The invention discloses a communication method for a wireless electric energy information cooperative transmission system, which can realize handshake of primary and secondary sides in the system starting process, ensure that both sides can accurately carry out negotiation of power transmission so as to meet the power requirements of charging equipment and charged equipment, and switch modulation modes during normal power supply so as to realize high-efficiency power transmission and high-speed data communication. The communication method not only omits an extra communication line and a signal modulation circuit, but also combines the advantages of the two modulation modes, solves the problem that ripple modulation cannot handshake when a system is started under the condition of not increasing cost, and has the characteristics of low cost, small equipment size and high communication reliability.
Description
Technical Field
The invention belongs to the technical field of power electronic wireless power transmission and carrier communication, and particularly relates to a communication method for a wireless power information cooperative transmission system.
Background
Compared with a wired charging technology, the wireless power transmission technology does not need to be connected with a power cable, and as the wireless power transmission technology and the electric equipment are not directly electrically connected, the potential safety hazard of the traditional wired charging mode in a severe environment is overcome, and the wireless power transmission technology has the advantages of being high in reliability and strong in portability; the contactless charging process is also beneficial to the realization of the intelligent development of the charging system. However, there are still problems in this process that need to be solved, including efficiency problems and safety monitoring problems in high power wireless charging, which require a reliable communication system for support.
The design of a complete wireless charging system mainly comprises a power circuit design and a communication circuit design, the wireless charging technology needs the support of the communication technology, the communication system is an indispensable part of the wireless charging system, and the wireless charging system can be used for voltage feedback control, coil alignment, foreign matter detection, power-on handshake, state monitoring, system protection and the like, so that the safety and reliability of wireless power transmission are ensured. The existing wireless communication technology at present can be divided into a radiation type wireless communication technology and a non-radiation type wireless communication technology, wherein the radiation type wireless communication technology comprises Bluetooth, wi-Fi, zigBee, radio frequency communication and the like, and in the application of wireless electric energy transmission, a communication channel and an energy transmission channel of the wireless electric energy transmission are independent, and information transmission is carried out by constructing a space electromagnetic field. Literature [ J.Kim, B.Clerckx, and p.d. mitcheson, "Signal and system design for wireless power transfer: prototype, experiment and validation," IEEE trans.wireless communication Commun, vol.19, no.11, pp.7453-7469, nov.2020] proposes a far field radiating wireless communication technology, energy and information being radiated by microwaves and received by rectangular antennas; however, such a radiation type wireless communication technology has problems of complicated transceiver pairing, high transmission delay, signal interference, communication security, and the like. In recent years, a non-radiative communication technology that can be used in a wireless charging system, that is, a non-radiative SWPIT (Simultaneous Wireless Power and Information Transfer, SWPIT) technology, is proposed, which is a technology based on a close-range coupled electromagnetic field, and fundamentally avoids the above-mentioned drawbacks of radiative wireless communication. For the SWPIT system, the implementation mode of the downlink communication from the source end to the load end is more, the difficulty is also less, and the implementation of the uplink communication from the load end to the source end is more difficult due to the passivity.
In the traditional SWPIT technology, an information transmission channel and an electric energy transmission channel are independent of each other, and are communicated by adding an additional coil or coils to construct a signal transmission channel, and as the signal transmission channel and the electric energy transmission channel are separated, the interference between the signal transmission channel and the electric energy transmission channel is small, so that the signal-to-noise ratio is improved, and the communication rate is improved; however, the additional communication coil and communication equipment add to the system volume and complexity, and increase the design and production costs.
The invention patent application with publication number of CN114825656A provides a wireless electric energy and data synchronous transmission system and a data modulation method, which adopts a power/information composite modulation technology to modulate the power PWM signal in the power electronic converter, thereby directly modulating the digital signal on the input or output port of the converter without an additional signal modulation circuit; however, the signal amplitude generated by the adopted ripple modulation method is small, and the method is only suitable for communication when the system works normally, and in the wireless charging starting process, the secondary side cannot normally send information to the primary side by adopting the method due to small power of the system, and uplink communication cannot be realized, so that connection between the primary side and the secondary side cannot be established when the power is on.
Disclosure of Invention
In view of the above, the present invention provides a communication method for a wireless power information cooperative transmission system, which can implement handshake of primary and secondary sides in a system starting process, ensure that both sides can accurately perform negotiation of power transmission, so as to meet power requirements of charging equipment and charged equipment, and switch modulation modes during normal power supply to implement high-efficiency power transmission and high-rate data communication.
The communication method for the wireless electric energy information cooperative transmission system comprises a primary side part and a secondary side part, wherein the primary side part is formed by sequentially connecting a power supply, a primary side DC-DC circuit, an inverter circuit, a primary side resonant circuit and a primary side coil, and the secondary side part is formed by sequentially connecting a secondary side coil, a secondary side resonant circuit, a rectifying circuit, a secondary side DC-DC circuit and a load, and the primary side coil and the secondary side coil are electromagnetically coupled; the communication method is characterized in that: when the secondary side transmits data to the primary side, two modulation modes are adopted, namely when the output power of the secondary side is smaller than the threshold E th When the output power of the secondary side is greater than the threshold E, a load modulation mode is adopted th The ripple modulation mode is adopted; the specific process is as follows:
(1) After the secondary side is electrified, a handshake request is sent to the primary side in a load modulation mode;
(2) Waiting for the original side to return the acknowledgement frame ACK1, if the waiting time exceeds T wait Re-executing step (1), if at T wait Receiving an acknowledgement frame ACK1 in time, and then performing the next step;
(3) The secondary side sends an acknowledgement frame ACK2 to the primary side in a load modulation mode;
(4) The secondary side detects the output power in real time and waits for the output power to be up-regulated to a threshold E th Above, if the waiting time exceeds T wait Re-executing step (3); if at T wait The output power reaches the threshold E in the time th The next step is carried out;
(5) The secondary side communicates with the primary side in a ripple modulation scheme.
Further, the load modulation mode is realized by switching the duty ratio by the secondary side DC-DC circuit, when the duty ratio is switched, the equivalent load of the secondary side (namely, the secondary side DC-DC circuit and the load are regarded as a whole) changes, so that the primary side current effective value changes, data information is modulated on the equivalent load of the secondary side, and the data transmitted from the secondary side to the primary side is demodulated by detecting the height of the primary side current effective value.
Further, the ripple modulation mode is realized by a secondary side DC-DC circuit, the switching ripple of the direct current bus carries corresponding data information by controlling the duty ratio, the frequency and the phase of a PWM driving signal of the secondary side DC-DC circuit, and the secondary side to primary side information transmission is realized by electromagnetic coupling of a coil; the ripple wave modulation method comprises two methods of power carrier wave modulation and power modulation wave modulation; for the power carrier modulation method, digital information is directly modulated onto a power carrier, and then compared with a power modulation wave to obtain a PWM signal; for the power modulation wave modulation method, digital information is modulated onto an independent carrier wave, and the modulated independent carrier wave is superimposed on the power modulation wave, and then compared with the power carrier wave to obtain a PWM signal.
Further, for the power carrier modulation method, digital information is modulated onto the power carrier by means of FSK (Frequency Shift Keying ), PSK (Phase Shift Keying, phase shift keying) or FH-DPSK (Frequency Hopping-Differential Phase Shift Keying ), so as to realize digital modulation of the frequency or phase of the PWM signal.
Further, for the power modulation wave modulation method, digital information is modulated onto an independent carrier wave in a manner of FSK, PSK or ASK (Amplitude Shift Keying ), so that the digital modulation of the duty ratio of the PWM signal is realized.
Further, the primary side DC-DC circuit and the secondary side DC-DC circuit adopt Buck converters, boost converters or Buck-Boost converters, the rectifying circuit adopts a full-bridge rectifying circuit structure, the inverting circuit adopts a full-bridge inverting circuit structure, the primary side resonant circuit adopts a compensation capacitor to be connected with the primary side coil in series or in parallel, and the secondary side resonant circuit adopts the compensation capacitor to be connected with the secondary side coil in series or in parallel.
Further, the communication method is suitable for a wireless electric energy information cooperative transmission system with the working frequency from 1kHz to 100 MHz.
The communication method not only omits an extra communication line and a signal modulation circuit, but also combines the advantages of the two modulation modes, solves the problem that ripple modulation cannot handshake when a system is started under the condition of not increasing cost, and has the characteristics of low cost, small equipment size and high communication reliability.
Based on the technical scheme, the invention has the following beneficial technical effects:
1. the invention does not need to add additional communication circuits, so that the hardware complexity of the wireless power transmission system is possible to be reduced.
2. The communication method fully exerts the advantages of load modulation and ripple modulation, flexibly switches the load modulation and the ripple modulation, and realizes reliable communication of wireless charging.
3. The invention designs a complete communication handshake process, and safely realizes the handshake link when the wireless system is started on the premise of not increasing the hardware cost.
Drawings
Fig. 1 is a schematic structural diagram of a wireless power information cooperative transmission system.
Fig. 2 is a schematic diagram of modulation of a power carrier according to the present invention.
Fig. 3 is a schematic diagram of modulation of a power modulated wave according to the present invention.
Fig. 4 is a schematic diagram of a communication execution flow between a secondary circuit and a primary circuit after power-up.
Fig. 5 is a schematic circuit diagram of a wireless power information cooperative transmission system according to an embodiment.
Fig. 6 is a schematic diagram of a waveform of an effective current value of the receiving end when the secondary side adopts the first modulation mode.
Fig. 7 is a schematic diagram of communication ripple and FFT of a receiving end when a secondary side adopts a second modulation mode.
Fig. 8 is a schematic diagram of voltage waveforms and demodulation data of the receiving end when the secondary side adopts the second modulation mode.
Detailed Description
In order to more particularly describe the present invention, the following detailed description of the technical scheme of the present invention is provided with reference to the accompanying drawings and the specific embodiments.
The wireless electric energy information cooperative transmission system structure is shown in fig. 1, and the system comprises a primary side transmitting circuit and a secondary side receiving circuit, wherein the primary side transmitting circuit comprises a power supply, a DC-DC circuit, an inverter circuit, a primary side compensation circuit and a transmitting coil which are sequentially connected; the secondary side receiving circuit comprises a receiving coil, a secondary side compensating circuit, a rectifying circuit, a DC-DC circuit and a load which are connected in sequence.
The secondary side of the invention adopts two modulation modes to transmit data to the primary side, when the output power of the secondary side is smaller than the threshold E th When the output power of the secondary side is greater than the threshold E th And a second modulation mode is adopted.
The first modulation mode is load modulation, the load modulation is realized by switching the duty ratio of a DC-DC circuit of the secondary side, when the duty ratio is switched, the equivalent load of the secondary side is switched, so that the current effective value of the primary side is changed, data information is modulated on the equivalent load of the secondary side, and data transmitted from the secondary side to the primary side can be demodulated by detecting the current effective value of the primary side.
The second modulation mode is ripple modulation, the ripple modulation is realized by a DC-DC circuit of the secondary side, and the principle is as follows: the driving signal of the switching device in the DC-DC circuit adopts PWM modulation, switching ripple can be generated, the ripple corresponding to amplitude, frequency and phase is generated on the DC bus by controlling the duty ratio, frequency and phase of the PWM driving signal, the switching ripple can carry data information, and the ripple can realize the transmission from the secondary side to the primary side through a magnetic coupling system. The PWM wave is obtained by comparing a power carrier wave with a power modulation wave, and the digital signal can be directly modulated on the power carrier wave or superimposed on the power modulation wave, the former being called power carrier modulation, and the latter being called power modulation wave modulation.
As shown in fig. 2, in the power carrier modulation process, digital information is directly modulated onto a power carrier, and the power carrier is compared with a power modulation wave to obtain a PWM signal, so as to realize digital modulation of the frequency or phase of the PWM signal; the digital information may be modulated onto the power carrier by means of FSK, PSK, FH-DPSK or the like.
As shown in fig. 3, in the process of modulating the power modulation wave, digital information is modulated on an independent carrier wave, the independent carrier wave is superimposed on the power modulation wave, the superimposed power modulation wave is compared with the power carrier wave to obtain a PWM signal, so as to implement digital modulation of the duty ratio of the PWM signal (which is equivalent to slightly perturbing the duty ratio), and the amplitude, phase and frequency of the perturbation of the duty ratio are independently controllable, so specific methods of data modulation include FSK, PSK, ASK.
As shown in fig. 4, the following steps are adopted after the secondary side circuit is powered on:
1. the secondary side sends a handshake request to the primary side in a first modulation mode;
2. waiting for the primary side to return an acknowledgement frame, if the waiting time exceeds T wait Step 1 is performed again, if at T wait Receiving the confirmation frame in time, and then carrying out the next step;
3. the secondary side sends an acknowledgement frame to the primary side in a first modulation mode;
4. the secondary side detects the output power in real time and waits for the output power to be up-regulated to a threshold E th Above, if the waiting time exceeds T wait Step 3 is performed again, if at T wait The output power reaches the threshold E in the time th The next step is carried out;
5. the secondary side communicates with the primary side in a second modulation scheme.
Step 1 to step 4 are communication handshake processes of a primary side and a secondary side when the system is started, the primary side establishes connection with a secondary side circuit after receiving a confirmation frame sent by the secondary side in step 3, and the output power of the system is improved through a primary side DC-DC circuit, so that the output power reaches a threshold E th Above, let the system work in normal power mode. When the system works in a normal power supply mode, the modulation mode of the secondary side transmitting information is switched from the first modulation mode to the second modulation mode.
Examples
In the embodiment of the invention, as shown in FIG. 5, the resonance circuit formed by the primary coil, the secondary coil and the compensation capacitor adopts an s-s structure, and the self inductance of the primary coil and the compensation capacitor are L respectively p 、C p The self inductance and the compensation capacitance of the secondary coil are respectively L s 、C s The inverter circuit adopts a switch tube Q 5 ～Q 8 The full-bridge inverter circuit is formed, and the rectifier circuit adopts a diode D 1 ～D 4 The full bridge rectifying circuit is composed, and a primary side DC-DC circuit adopts a switching tube Q 1 ～Q 4 And inductance L f1 The four-switch Buck-boost circuit is formed, and a secondary side DC-DC circuit adopts a switch tube Q 9 ,Q 10 And inductance L f2 The DC power supply of the input end of the Buck-boost circuit is V DC The load is R L 。
The voltage gain of the primary side four-switch Buck-boost circuit isD in 1 Is a switching tube Q 1 Duty cycle of on, D 2 Is a switching tube Q 4 Duty cycle of on, Q 1 And Q 2 Complementary conduction, Q 3 And Q 4 Complementary conduction; by adjusting D 1 And D 2 To adjust the output power of the system, or by adjusting D 2 Disturbance is added to realize information injection, so that ripple modulation is realized. The voltage gain of the Buck-boost circuit of the secondary side is +.>D in 3 Is a switching tube Q 9 Duty cycle of on, Q 9 And Q 10 Complementary conduction; by adjusting D 3 The magnitude of the equivalent load of the system is regulated, so that load modulation is realized; can also be achieved by the method of D 3 Disturbance is added to realize information injection, so that ripple modulation is realized. The circuit parameters are shown in table 1:
TABLE 1
The input voltage is 2V, and when the system is started, the four-switch Buck-boost on the primary side is set to have smaller duty ratio D 1 And D 2 The input power is kept in the range of 0.1-0.5 w, and the information transmitted by the secondary side equipment is waited. The secondary side adopts load modulation to make the duty ratio D 3 Switching between 50% and 90%, when D 3 When the current is=50%, the equivalent load impedance of the secondary side is larger, the impedance refracted to the primary side is small, and the current of the primary side is at a high value; when D is 3 When=90%, the secondary equivalent load impedance is small, the impedance refracted to the primary is large, and the primary current is at a low value. The load modulation in this experiment adopts pulse position modulation method to make primary side current low value (i.e. secondary side buck-boost duty ratio D 3 The duration of =90%) is fixed to 0.2ms, and the primary current high value (i.e. secondary buck-boost duty cycle D is changed 3 =50%) and if the high value duration is 1ms, then it represents data 0; if the high value duration is 2ms, data 1 is represented.
By means of pulse position modulation, the handshake request information sent from the secondary side to the primary side is 0,1,0,1,0,1,0,1,0,1, the waveform of the current effective value obtained from the direct current side of the primary side is as shown in fig. 6, the waveform is consistent with the information sent from the secondary side, and the primary side can demodulate correct data and receive the handshake request.
Next, the primary side sends a handshake acknowledgement frame to the secondary side, and the power modulation wave-based DPSK modulation is adopted to superimpose a disturbance of 25kHz on the duty cycle D 2 On this, digital modulation of the duty cycle of the PWM signal is realized. The amplitude of the duty ratio disturbance is set to 10% (the disturbance degree is large), the modulation adopts a quaternary DPSK mode, namely the phase difference of the code element is equally divided into 4 intervals from 0 to 360 degrees, and the intervals respectively represent the numbers 0,1,2 and 3. The secondary side carries out sampling and conditioning on current ripple and demodulates by using a singlechip, so that correct data can be obtained.
After the secondary side receives the confirmation frame, a confirmation frame is sent to the primary side in a load modulation mode, and after the primary side receives the confirmation frame, the primary side formally completes handshake and establishes connection.
Then, the duty ratio D 1 And D 2 The output power of the primary side four-switch buck-boost is increased to 8-10 w; the output power of the secondary side detection system indicates the primary side when the output power exceeds the threshold value 2wWhen the acknowledgement frame has been received and the power is up-regulated, the secondary side information transmission mode is switched from the first modulation mode to the second modulation mode.
From this point on, the system enters a normal power supply mode, the primary and secondary sides are modulated by DPSK based on power modulation waves, and the disturbance of 25kHz is superimposed on the duty cycle D 2 (when communicating primary to secondary) or D 3 Digital modulation of the PWM signal duty cycle is achieved (when the secondary side communicates to the primary side). The amplitude of the duty ratio disturbance is set to be 1% (the disturbance degree is small), the modulation adopts a quaternary DPSK mode, namely the phase difference of the code element is equally divided into 4 sections from 0 to 360 degrees, and the sections respectively represent the numbers 0,1,2 and 3. The receiving end carries out sampling and conditioning on the current ripple and demodulates the current ripple by using the singlechip, so that correct data can be obtained.
When the communication experiment is carried out during normal power supply by the method, a section of data is sent every 2ms, the data is sent from the secondary side, the current ripple waveform received by the primary side and the FFT thereof are shown in figure 7, the signal amplitude during visible communication is obvious, and the main frequency component of the signal is 25kHz, which indicates that the information is transmitted from the sending end to the receiving end. And the signal amplitude is 0 when not communicating.
The current ripple is sampled and conditioned, the sampled and conditioned current ripple is sent to a singlechip for demodulation, data carried by the ripple can be obtained, when the transmitted data is 0,1,2,3,0,1,2,3,0,1, the waveform of a receiving end and the demodulated data are shown in fig. 8, a channel 1 is DAC output after demodulation of the singlechip, and a channel 2 is the voltage waveform of the receiving end. Different amplitude values of DAC output represent different data, the amplitude values of DAC output from small to large represent data from 0 to 3 respectively, and the ripple signal strength extracted by the receiving end is large enough, and the demodulation result is correct.
The embodiments described above are described in order to facilitate the understanding and application of the present invention to those skilled in the art, and it will be apparent to those skilled in the art that various modifications may be made to the embodiments described above and that the general principles described herein may be applied to other embodiments without the need for inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications within the scope of the present invention.
Claims (8)
1. The communication method for the wireless electric energy information cooperative transmission system comprises a primary side part and a secondary side part, wherein the primary side part is formed by sequentially connecting a power supply, a primary side DC-DC circuit, an inverter circuit, a primary side resonant circuit and a primary side coil, and the secondary side part is formed by sequentially connecting a secondary side coil, a secondary side resonant circuit, a rectifying circuit, a secondary side DC-DC circuit and a load, and the primary side coil and the secondary side coil are electromagnetically coupled; the communication method is characterized in that: when the secondary side transmits data to the primary side, two modulation modes are adopted, namely when the output power of the secondary side is smaller than the threshold E th When the output power of the secondary side is greater than the threshold E, a load modulation mode is adopted th The ripple modulation mode is adopted, and the specific process is as follows:
(1) After the secondary side is electrified, a handshake request is sent to the primary side in a load modulation mode;
(2) Waiting for the original side to return the acknowledgement frame ACK1, if the waiting time exceeds T wait Re-executing step (1), if at T wait Receiving an acknowledgement frame ACK1 in time, and then performing the next step;
(3) The secondary side sends an acknowledgement frame ACK2 to the primary side in a load modulation mode;
(4) The secondary side detects the output power in real time and waits for the output power to be up-regulated to a threshold E th Above, if the waiting time exceeds T wait Re-executing step (3); if at T wait The output power reaches the threshold E in the time th The next step is carried out;
(5) The secondary side communicates with the primary side in a ripple modulation scheme.
2. A communication method according to claim 1, characterized in that: the load modulation mode is realized by switching the duty ratio of the secondary side DC-DC circuit, when the duty ratio is switched, the equivalent load of the secondary side is changed, so that the effective value of the primary side current is changed, data information is modulated on the equivalent load of the secondary side, and the data transmitted from the secondary side to the primary side is demodulated by detecting the effective value of the primary side current.
3. A communication method according to claim 1, characterized in that: the ripple modulation mode is realized by a secondary side DC-DC circuit, the switching ripple of a direct current bus carries corresponding data information by controlling the duty ratio, the frequency and the phase of a PWM driving signal of the secondary side DC-DC circuit, and the secondary side to primary side information transmission is realized by electromagnetic coupling of a coil; the ripple wave modulation method comprises two methods of power carrier wave modulation and power modulation wave modulation; for the power carrier modulation method, digital information is directly modulated onto a power carrier, and then compared with a power modulation wave to obtain a PWM signal; for the power modulation wave modulation method, digital information is modulated onto an independent carrier wave, and the modulated independent carrier wave is superimposed on the power modulation wave, and then compared with the power carrier wave to obtain a PWM signal.
4. A communication method according to claim 3, characterized in that: for the power carrier modulation method, digital information is modulated on a power carrier in a FSK, PSK or FH-DPSK mode, so that the digital modulation of the frequency or phase of a PWM signal is realized.
5. A communication method according to claim 3, characterized in that: for the power modulation wave modulation method, digital information is modulated on an independent carrier wave in a FSK, PSK or ASK mode, so that the digital modulation of the duty ratio of the PWM signal is realized.
6. A communication method according to claim 1, characterized in that: the primary side DC-DC circuit and the secondary side DC-DC circuit adopt Buck converters, boost converters or Buck-Boost converters, the rectifying circuit adopts a full-bridge rectifying circuit structure, the inverting circuit adopts a full-bridge inverting circuit structure, the primary side resonant circuit adopts a compensation capacitor to be connected with the primary side coil in series or in parallel, and the secondary side resonant circuit adopts a compensation capacitor to be connected with the secondary side coil in series or in parallel.
7. A communication method according to claim 1, characterized in that: the communication method is suitable for a wireless electric energy information cooperative transmission system with the working frequency from 1kHz to 100 MHz.
8. A communication method according to claim 1, characterized in that: the communication method not only omits an additional communication line and a signal modulation circuit, but also combines the advantages of the two modulation modes, solves the problem that ripple modulation cannot handshake when the system is started under the condition of not increasing the cost, and has the characteristics of low cost, small equipment size and high communication reliability.
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