CN110768392B - Inductively coupled power transmission and full duplex signal hybrid transmission circuit and method - Google Patents
Inductively coupled power transmission and full duplex signal hybrid transmission circuit and method Download PDFInfo
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- CN110768392B CN110768392B CN201911020445.5A CN201911020445A CN110768392B CN 110768392 B CN110768392 B CN 110768392B CN 201911020445 A CN201911020445 A CN 201911020445A CN 110768392 B CN110768392 B CN 110768392B
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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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Near-Field Transmission Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
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Abstract
The application discloses a circuit for inductively coupling electric energy transmission and full duplex signal mixed transmission, wherein a primary side digital baseband signal generates a 2FSK modulation signal through alternating current frequency conversion driving to form inductive energy coupling with a secondary side, the secondary side obtains the 2FSK modulation signal through current detection, and then a signal processing means such as a phase-locked loop or a single frequency tuning circuit is used for obtaining the 2FSK digital baseband signal which is positively transmitted by the primary side. Meanwhile, the secondary side adopts an ICPT power transmission receiving and transmitting front end double-resonance network, a detuning capacitor and a transistor are added, the turning on and off of the transistor corresponds to the change and the keeping of the original tuning capacitor, the resonance network is respectively in a detuned state and a resonance state, the load modulation effect of changing the equivalent load of the secondary side is achieved, the change of the primary side inductance coil current is caused, a 2ASK modulation signal is formed, the 2ASK digital baseband signal reversely transmitted by the secondary side is obtained through signal processing, and therefore single-channel electric energy and full duplex signal mixed transmission is achieved.
Description
Technical Field
The application belongs to the technical field of microelectronics and communication, and particularly relates to the field of Inductive Coupling Power Transfer (ICPT).
Background
The inductive coupling type electric energy transmission technology (ICPT) is based on an electromagnetic induction principle, electric energy interaction is carried out through a high-frequency magnetic field, air is used as a coupling medium between a transmitting coil and a pickup coil of the inductive coupling type electric energy transmission system, and the transmitting coil and the pickup coil can relatively displace. The wireless power supply device solves the problems and potential safety hazards existing in the traditional power supply mode in special occasions (occasions such as underwater or inflammable and explosive occasions) and equipment power supply under the conditions of rotation, movement and the like, and can realize wireless transmission of electric energy.
At present, the traditional signal transmission method in the ICPT system adopts a method of separating and transmitting signals and electric energy, and the method not only increases the volume and complexity of an inductive coupling mechanism, but also has the problem of crosstalk of electric energy transmission on signal transmission to a certain extent. Thus, researchers have investigated the mixed transmission of ICPT power signals. In general, the transmission of signals from primary side to secondary side is the forward transmission of signals, and then the transmission from secondary side to primary side of the ICPT system is the reverse transmission of data. For forward transmission, the ICPT system transmits electric energy from the primary side to the secondary side, so that the primary side electric energy can be used as a carrier wave, and a digital signal is loaded on the electric energy through a certain modulation means, so that the transmitted electric energy has the characteristic of a digital signal. The secondary side electric energy receiving end extracts electric energy characteristics and restores digital signals while receiving electric energy.
However, in practical applications, feedback information of the electric equipment such as a sensor where the secondary side is located may need to be detected in real time, which requires that signals are reversely transmitted in the ICPT system. The reverse transmission of signals differs from the forward transmission described above in that: in the ICPT system, the secondary side belongs to an electric energy receiving mechanism, and cannot send electric energy to the primary side, and the secondary side and the primary side belong to a master-slave relationship, so that a signal cannot be modulated by directly taking a certain characteristic of the electric energy as a modulation method like forward transmission.
Disclosure of Invention
The purpose of the application is that: on the premise of not adding a separate signal transmission channel, the ICPT electric energy and full duplex signal mixed transmission circuit and method adopting forward 2FSK frequency modulation and reverse 2ASK amplitude modulation are provided.
In order to achieve the above object, one technical solution of the present application is to provide a primary circuit of an ICPT single channel power and full duplex signal hybrid transmission system, which is characterized by comprising:
the alternating current variable frequency driving module is used for generating a 2FSK modulation signal according to the forward transmission digital baseband signal obtained by the primary side microprocessor;
a resonant capacitor and an inductance coil for forming a primary oscillating circuit;
a current detection module, which is used for obtaining the 2ASK modulation signal reversely sent by the secondary side circuit;
a signal processing module for obtaining the digital baseband signal reversely transmitted by the secondary circuit
Another technical solution of the present application is to provide a secondary side circuit of an ICPT single channel power and full duplex signal hybrid transmission system, which is characterized by comprising:
the double-resonance-point network comprises a circuit formed by a plurality of capacitors and inductors, and the resonance frequency is two frequencies generated by the alternating-current variable-frequency driving module of the primary circuit and is used for simultaneously tuning primary-side 2FSK modulation signals;
a load power conversion module for providing a secondary side element with a usable power supply;
the current detection module is used for obtaining a 2FSK modulation signal transmitted forward by the primary circuit;
the signal processing module is used for obtaining a 2FSK digital baseband signal which is transmitted forward by the primary circuit through a phase-locked loop or a single frequency tuning circuit;
the detuning capacitor is connected in series with a load modulation transistor and then connected in parallel to two ends of the double-resonance-point network, so that the secondary resonance network is selectively detuned;
the load modulation transistor is connected in series with the detuning capacitor and then connected in parallel to two ends of the double-resonance-point network, so that the secondary resonance network is selectively detuned;
and the microprocessor and the load modulation module in the digital baseband are used for generating a 2ASK digital baseband signal according to protocol requirements and selectively controlling the on and off of the load modulation transistor.
The application provides a method for ICPT single-channel electric energy and full duplex signal mixed transmission, which is characterized in that a full duplex signal transmission mode of primary side forward 2FSK frequency modulation and secondary side reverse 2ASK amplitude modulation is adopted; the primary side circuit generates a 2FSK modulation signal through alternating current variable frequency driving according to the forward transmission digital baseband signal and forms inductive energy coupling with the secondary side circuit, the secondary side circuit obtains the 2FSK modulation signal through current detection, and then the 2FSK digital baseband signal forward transmitted by the primary side circuit is obtained; the secondary side circuit utilizes a load power conversion circuit to provide a power supply required by the work for a secondary side element, the magnitude of resonance frequency is selectively changed on the basis of an original double-resonance-point network through the on and off of a load modulation transistor controlled by a digital baseband, so that the secondary side resonance network is selectively in a detuned state and a resonance state, different resonance network equivalent loads are obtained to realize load reverse 2ASK modulation, a primary side circuit obtains a 2ASK modulation signal through current detection, and a 2ASK digital baseband signal reversely transmitted by the secondary side circuit is obtained through signal processing; the dual-resonance-point network of the secondary side circuit must have two resonance points, so that the reflected impedance change of the secondary side circuit can be correctly reflected on the current signal change of the primary side circuit, and is not influenced by the frequency modulation keying states 0 and 1 of the primary side.
Preferably, the secondary side circuit obtains the 2FSK digital baseband signal sent forward by the primary side circuit through a phase-locked loop or a single frequency tuning circuit.
Preferably, the method specifically comprises the following steps:
(1) The primary microprocessor of the primary circuit obtains a forward transmitting digital baseband signal, generates a 2FSK modulation signal through alternating current variable frequency drive, and forms inductive energy coupling with the secondary circuit through a primary oscillating loop formed by a resonance capacitor of the primary circuit and an inductance coil of the primary circuit;
(2) The secondary side circuit utilizes a load power conversion module to provide power required by normal operation for the secondary side element;
(3) The secondary side circuit obtains a 2FSK modulation signal through current detection, and a 2FSK digital baseband signal which is sent forward by the primary side circuit is obtained;
(4) The microprocessor of the secondary side circuit carries out relevant processing on the signal to be reversely transmitted back to the primary side circuit and converts the signal into digital quantity, and a load modulation module in a digital baseband is transmitted to a load modulation transistor according to the protocol requirement;
(5) The load modulation transistor is in corresponding on and off states according to the data transmitted by the load modulation module in the digital baseband;
(6) When the load modulation transistor is in a closed state, the detuning capacitor is disconnected with two ends of the double-resonance-point network, namely is not connected with the double-resonance-point network in parallel, and the secondary resonance frequency is determined to be still the double-resonance-point network at the moment, so that the secondary resonance network is still in a resonance state;
(7) When the load modulation transistor is on, the detuning capacitor is connected with two ends of the inductance coil of the double-resonance-point network, namely, is connected with the double-resonance-point network in parallel, and the total resonance network formed by the detuning capacitor and the double-resonance-point network in parallel is used for determining the secondary resonance frequency, so that the secondary resonance network is in a detuned state.
(8) The secondary side impedance change generated by the conversion of the resonance state and the detuning state of the secondary side resonance network is mapped into the current of the primary side circuit, the primary side circuit obtains a 2ASK modulation signal through current detection, and the 2ASK digital baseband signal reversely transmitted by the secondary side circuit is obtained through signal processing.
The application has the unique advantages that: and ICPT full duplex signal transmission is realized by adopting a forward 2FSK frequency modulation and reverse 2ASK amplitude modulation mode. In the load 2ASK modulation process of ICPT signal mixed reverse transmission, a detuning capacitor is selectively connected in parallel on the basis of an original double-resonance-point network by switching on and off a load modulation transistor controlled by a digital baseband, so that a secondary resonance network is selectively in a detuning state and a resonance state to obtain different secondary equivalent loads to realize load modulation. The secondary side resonant network must have two resonance points, so that the reflected impedance change of the secondary side can be correctly reflected on the current signal change of the primary side, and is not influenced by the frequency modulation keying states 0 and 1 of the primary side. In addition, in the load reverse modulation process, the equivalent load of the secondary side is changed from a smaller value at the time of detuning to a larger value at the time of resonance, so that the condition of insufficient power transmission of electric energy does not occur.
Drawings
Fig. 1 is a basic structure of ICPT single-channel power and full duplex signal hybrid transmission system of the present application.
Reference numerals in the figures
101 is a primary ac variable frequency drive module, 102 is a primary resonance capacitor, 103 is a primary inductance coil, 104 is a primary current detection module, 105 is a primary signal processing module, 106 is a secondary double resonance point network, 107 is a secondary detuning capacitor, 108 is a secondary load modulation transistor, 109 is a secondary current detection module, 110 is a secondary signal processing module, 111 is a digital baseband portion of the secondary resonance network, 112 is a secondary microprocessor, and 113 is a secondary load power conversion module.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The application provides an ICPT single-channel electric energy and full duplex signal mixed transmission circuit and method adopting primary side forward 2FSK frequency modulation and secondary side reverse 2ASK amplitude modulation. The primary side generates a 2FSK modulation signal through alternating current variable frequency driving according to the forward transmitted digital baseband signal, forms inductive energy coupling with the secondary side, and the secondary side provides a power supply required by operation for a secondary side element by utilizing a load power conversion circuit, obtains the 2FSK modulation signal through current detection, and obtains the forward transmitted 2FSK digital baseband signal of the primary side through signal processing means such as a phase-locked loop or a single frequency tuning circuit. Meanwhile, the secondary side adopts an ICPT power transmission receiving and transmitting front end double-resonance network, a detuning capacitor and a load modulation transistor are added, the on and off of the transistor controlled by the digital baseband corresponds to the change and the unchanged of the original tuning capacitor, the resonance network is respectively in a detuning state and a resonance state, the load modulation effect of changing the equivalent load of the secondary side is achieved, the change of the primary side inductance coil current is caused, a 2ASK modulation signal is formed, the 2ASK digital baseband signal reversely transmitted by the secondary side is obtained through signal processing, and therefore single-channel electric energy and full duplex signal mixed transmission is achieved.
As shown in fig. 1, the primary side of the present application provided for a single-channel power and full duplex signal hybrid transmission circuit of an ICPT system includes: an ac variable frequency driving module 101 for generating a 2FSK modulated signal according to the forward transmitted digital baseband signal obtained by the primary microprocessor; a resonant capacitor 102 and an inductance coil 103 for forming a primary tank circuit; a current detection module 104, configured to obtain a 2ASK modulated signal sent in a reverse direction by the secondary side; a signal processing module 105, configured to obtain a digital baseband signal that is reversely transmitted by the secondary side. The secondary side comprises: a dual-resonance-point network 106, which comprises a circuit composed of a plurality of capacitors and inductors, wherein the resonance frequency is two frequencies generated by the primary side alternating current variable frequency driving module and is used for simultaneously tuning the primary side 2FSK modulation signal; a load power conversion module 113 for providing secondary side element available power; a current detection module 109, configured to obtain a 2FSK modulated signal that is sent forward by the primary side; a signal processing module 110, configured to obtain a 2FSK digital baseband signal sent forward from the primary side through a phase locked loop or a single frequency tuning circuit; a detuning capacitor 107, which is connected in series with a load modulation transistor 108 and then connected in parallel to two ends of the dual resonance point network 106, so that the secondary resonance network is selectively detuned; a load modulation transistor 108, which is connected in series with the detuning capacitor 107 and then connected in parallel to two ends of the dual resonance point network 106, so that the secondary resonance network is selectively detuned; a microprocessor 112 and a load modulation module in the digital baseband 111, for generating a 2ASK digital baseband signal according to the protocol requirements, selectively controlling the on and off of the load modulation transistor 108.
The detuning capacitor 107 and the load modulation transistor 108 are connected in series and then connected in parallel to two ends of the dual-resonance-point network 106, when the load modulation transistor 108 is turned off, the detuning capacitor 107 does not work, and when the load modulation transistor 108 is turned on, the detuning capacitor 107 works, and the detuning capacitor 107 is connected in parallel with the dual-resonance-point network 106 to change the resonance frequency of the secondary-side total-resonance network, thereby detuning the secondary-side resonance network.
The load modulation module is a necessary core module in the digital baseband 111, and other core modules may be further included in the digital baseband 111 according to requirements of different protocols and different digital baseband structures.
The above-mentioned method of implementing load modulation by changing tuning capacitance to detune the secondary resonance network is equivalent to the above-mentioned method in which a double resonance point network 106, a detuning capacitance 107 and a load modulation transistor 108 are the most basic components for implementing load modulation by the detuning method by changing tuning capacitance.
The ICPT single-channel electric energy and full duplex signal hybrid transmission system of the application has the following working processes:
(1) The primary side microprocessor obtains a forward transmitting digital baseband signal, generates a 2FSK modulation signal through the alternating current frequency conversion driving module 101, and forms inductive energy coupling with the secondary side through a resonance network formed by the primary side resonance capacitor 102 and the primary side inductance coil 103.
(2) The secondary side utilizes a load power conversion module 113 to provide the secondary side components with the power necessary for proper operation.
(3) The secondary side obtains a 2FSK modulation signal through a current detection module 109, and obtains a 2FSK digital baseband signal sent forward by the primary side through a signal processing module 110 such as a phase-locked loop or a tuning circuit.
(4) After the secondary side microprocessor 112 correlates and converts the signal to be reversely transmitted back to the primary side into digital quantity, the load modulation module in the digital baseband 111 transmits to the load modulation transistor 108 according to the protocol requirement.
(5) The load modulation transistor 108 is in a corresponding on and off state according to the data transmitted from the load modulation module in the digital baseband 111.
(6) When the load modulation transistor 108 is turned off, the detuning capacitor 107 is disconnected from both ends of the secondary side dual-resonance-point network 106, i.e. not connected in parallel with the dual-resonance-point network, and the secondary side resonance frequency is determined to be still the dual-resonance-point network, so that the secondary side resonance network is still in a resonance state.
(7) When the load modulation transistor 108 is turned on, the detuning capacitor 107 is connected to two ends of the inductance coil of the secondary side resonance network 106, that is, connected in parallel with the dual resonance point network, and at this time, it is the total resonance network formed by the detuning capacitor and the dual resonance point network that determines the secondary side resonance frequency, so that the secondary side resonance network is in a detuned state.
(8) The secondary side impedance change generated by the conversion of the resonance state and the detuning state of the secondary side resonance network is mapped into the primary side current, the primary side obtains a 2ASK modulation signal through the current detection module 104, and a 2ASK digital baseband signal reversely transmitted by the secondary side is obtained through the signal processing module 105.
In summary, the primary side generates the 2FSK modulation signal by ac frequency conversion driving according to the forward transmission digital baseband signal, and forms inductive energy coupling with the secondary side, the secondary side obtains the 2FSK modulation signal by current detection, and then obtains the 2FSK digital baseband signal forward transmitted by the primary side by signal processing means such as a phase-locked loop or a single frequency tuning circuit. The secondary side utilizes a load power conversion circuit to provide a power supply required by the operation for the secondary side element, meanwhile, a 2ASK digital baseband signal reversely transmitted by the secondary side is obtained according to a microprocessor, and a load modulation detuning capacitance switch is switched accordingly to form conversion of a resonance state and a detuning state of a secondary side resonance network, so that the generated secondary side impedance change can be mapped into primary side current, the primary side obtains a 2ASK modulation signal through current detection, and the 2ASK digital baseband signal reversely transmitted by the secondary side is obtained through signal processing, thereby realizing the mixed transmission process of electric energy and full duplex signals by adopting the same inductive coupling channel in an ICPT system.
Claims (4)
1. A secondary side circuit of an ICPT single channel power and full duplex signal hybrid transmission system, comprising:
the double resonance point network comprises a circuit formed by a plurality of capacitors and inductors, and the resonance frequency is two frequencies generated by an alternating current variable frequency driving module of a primary circuit and is used for simultaneously tuning a primary 2FSK modulation signal; the primary side circuit includes: the alternating current variable frequency driving module is used for generating a 2FSK modulation signal according to the forward transmission digital baseband signal obtained by the primary side microprocessor; a resonant capacitor and an inductance coil for forming a primary oscillating circuit; a current detection module, which is used for obtaining the 2ASK modulation signal reversely sent by the secondary side circuit; a signal processing module for obtaining the digital baseband signal reversely sent by the secondary circuit;
a load power conversion module for providing a secondary side element with a usable power supply;
the current detection module is used for obtaining a 2FSK modulation signal transmitted forward by the primary circuit;
the signal processing module is used for obtaining a 2FSK digital baseband signal which is transmitted forward by the primary circuit through a phase-locked loop or a single frequency tuning circuit;
the detuning capacitor is connected in series with a load modulation transistor and then connected in parallel to two ends of the double-resonance-point network, so that the secondary resonance network is selectively detuned;
the load modulation transistor is connected in series with the detuning capacitor and then connected in parallel to two ends of the double-resonance-point network, so that the secondary resonance network is selectively detuned;
and the microprocessor and the load modulation module in the digital baseband are used for generating a 2ASK digital baseband signal according to protocol requirements and selectively controlling the on and off of the load modulation transistor.
2. A method for ICPT single channel electric energy and full duplex signal mixed transmission is characterized in that a full duplex signal transmission mode of primary side forward 2FSK frequency modulation and secondary side reverse 2ASK amplitude modulation is adopted; the primary side circuit generates a 2FSK modulation signal through alternating current variable frequency driving according to the forward transmission digital baseband signal and forms inductive energy coupling with the secondary side circuit according to the claim 1, the secondary side circuit obtains the 2FSK modulation signal through current detection, and then obtains the 2FSK digital baseband signal forward transmitted by the primary side circuit; the secondary side circuit utilizes a load power conversion circuit to provide a power supply required by the work for a secondary side element, the magnitude of resonance frequency is selectively changed on the basis of an original double-resonance-point network through the on and off of a load modulation transistor controlled by a digital baseband, so that the secondary side resonance network is selectively in a detuned state and a resonance state, different resonance network equivalent loads are obtained to realize load reverse 2ASK modulation, a primary side circuit obtains a 2ASK modulation signal through current detection, and a 2ASK digital baseband signal reversely transmitted by the secondary side circuit is obtained through signal processing; the dual-resonance-point network of the secondary circuit must have two resonance points to enable the reflected impedance variation of the secondary circuit to be correctly reflected on the current signal variation of the primary circuit without being affected by the fm keying states 0 and 1 of the primary circuit, wherein: the primary side circuit includes:
the alternating current variable frequency driving module is used for generating a 2FSK modulation signal according to the forward transmission digital baseband signal obtained by the primary side microprocessor;
a resonant capacitor and an inductance coil for forming a primary oscillating circuit;
a current detection module, which is used for obtaining the 2ASK modulation signal reversely sent by the secondary side circuit;
and the signal processing module is used for obtaining the digital baseband signal reversely sent by the secondary side circuit.
3. A method for ICPT single channel power and full duplex signal hybrid transmission as defined in claim 2 wherein the secondary side circuit obtains the 2FSK digital baseband signal being transmitted forward by the primary side circuit through a phase locked loop or single frequency tuning circuit.
4. The method for ICPT single channel power and full duplex signal hybrid transmission of claim 2, comprising the steps of:
(1) The primary microprocessor of the primary circuit obtains a forward transmitting digital baseband signal, generates a 2FSK modulation signal through alternating current variable frequency drive, and forms inductive energy coupling with the secondary circuit through a primary oscillating loop formed by a resonance capacitor of the primary circuit and an inductance coil of the primary circuit;
(2) The secondary side circuit utilizes a load power conversion module to provide power required by normal operation for the secondary side element;
(3) The secondary side circuit obtains a 2FSK modulation signal through current detection, and a 2FSK digital baseband signal which is sent forward by the primary side circuit is obtained;
(4) The microprocessor of the secondary side circuit carries out relevant processing on the signal to be reversely transmitted back to the primary side circuit and converts the signal into digital quantity, and a load modulation module in a digital baseband is transmitted to a load modulation transistor according to the protocol requirement;
(5) The load modulation transistor is in corresponding on and off states according to the data transmitted by the load modulation module in the digital baseband;
(6) When the load modulation transistor is in a closed state, the detuning capacitor is disconnected with two ends of the double-resonance-point network, namely is not connected with the double-resonance-point network in parallel, and the secondary resonance frequency is determined to be still the double-resonance-point network at the moment, so that the secondary resonance network is still in a resonance state;
(7) When the load modulation transistor is on, the detuning capacitor is connected with two ends of an inductance coil of the double-resonance-point network, namely, is connected with the double-resonance-point network in parallel, and the total resonance network formed by the detuning capacitor and the double-resonance-point network in parallel is used for determining the secondary resonance frequency, so that the secondary resonance network is in a detuned state;
(8) The secondary side impedance change generated by the conversion of the resonance state and the detuning state of the secondary side resonance network is mapped into the current of the primary side circuit, the primary side circuit obtains a 2ASK modulation signal through current detection, and the 2ASK digital baseband signal reversely transmitted by the secondary side circuit is obtained through signal processing.
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| CN111308247B (en) * | 2020-03-15 | 2022-08-02 | 东南大学 | WPT system harmonic judgment method based on unilateral detection current phase change rate detection |
| CN111987813B (en) * | 2020-08-31 | 2022-05-20 | 重庆大学 | Synchronous full-duplex communication wireless power transmission system based on single-coil coupling mechanism |
| CN112713908A (en) * | 2020-12-24 | 2021-04-27 | 苏州信卓胜电子科技有限公司 | Electromagnetic induction wireless information transmission receiving circuit |
| CN114280516A (en) * | 2021-12-15 | 2022-04-05 | 深圳市联影高端医疗装备创新研究院 | Coil, dual-frequency coil and magnetic resonance system |
| CN113960952B (en) * | 2021-12-22 | 2022-04-15 | 四川承天翼航空科技有限公司 | Contactless electromagnetic control and execution system |
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