CN103795154A - Load legitimacy determination method of inductive wireless electric energy transmission system - Google Patents
Load legitimacy determination method of inductive wireless electric energy transmission system Download PDFInfo
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- CN103795154A CN103795154A CN201310596823.0A CN201310596823A CN103795154A CN 103795154 A CN103795154 A CN 103795154A CN 201310596823 A CN201310596823 A CN 201310596823A CN 103795154 A CN103795154 A CN 103795154A
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Abstract
A load legitimacy determination method of an inductive wireless electric energy transmission system is provided. The method includes the following steps that: at an energy transmitting end, a controller controls a transmitting coil and enables the same to generate a weak magnetic field, and transmitting coil current is detected and recorded in a real-time manner, and frequency pulses are demodulated out from an envelope line of the transmitting coil current, testing is performed between the frequency pulses and a built-in key, if the testing succeeds, rated high-frequency alternating current can be implanted into the transmitting coil, and the system enters a normal energy transmission state; and at an energy pickup end, when an electromotive force induced by a pickup coil is lowered than a set threshold value, a controller of the energy pickup end controls a BOOST direct current conversion circuit and enables the same to work in a low-frequency mode, and the controller, with a pulse sequence containing authentication information adopted as switching control signals, enables the amplitude value of pickup coil current to change correspondingly and to be coupled to the transmitting coil, and when the electromotive force induced by the pickup coil exceeds the set threshold value, the BOOST direct current conversion circuit is switched to a high-frequency mode, and the energy pickup end enters a normal energy pickup state.
Description
Technical field
The present invention relates to a kind of load validity decision method of induction type radio energy transmission system.
Background technology
Induction type wireless power transmission (ICPT) technology is a kind of based on electromagnetic field near field loose coupling principle of induction, comprehensive utilization Technics of Power Electronic Conversion technology, magnetic Field Coupling technology and control theory, realize power consumption equipment obtains energy from electrical network technology with the non-wire way of contact, there is the features such as power supply is flexible, safe and reliable, maintenance cost is low.
The typical structure of an ICPT system generally picks up two parts of end by completely electric independently energy transmitting terminal and energy and forms, and wherein to pick up the relation of end can be man-to-man for energy transmitting terminal and energy, can be also one-to-many.The basic principle of ICPT system is to utilize controlled resonant converter that industrial-frequency alternating current or direct current are transformed to high-frequency alternating current, the transmitting coil (or guide rail coil) of Implantation Energy transmitting terminal, based on electromagnetic induction principle, near of energy transmitting coil will inspire the high-frequency alternating magnetic field with same frequency, energy in this magnetic field is picked up in the pick-up winding of end and induce high-frequency electrical kinetic potential, use electric loading finally by directly exporting to after Technics of Power Electronic Conversion, thereby realize the wireless transmission of electric energy.
The radio energy transmission system of magnetic Field Coupling mode, owing to there is no direct electrical contact between transmitting coil and pick-up winding, and there is the air gap of a cm level, this makes excitatory magnetic field have certain opening, in the time having illegal load to enter this alternating magnetic field space, can cause the waste of energy or stolen, bring potential safety hazard to wireless power transmission: as magnetic conductive metal thing enters alternating magnetic field space, can produce eddy current because of electromagnetic induction, and follow serious heating simultaneously, cause the waste of energy; As the stealing load with pick-up winding enters alternating magnetic field space, can cause the stolen of energy.Therefore, be necessary the load legitimacy of ICPT system to differentiate.
At present, ICPT system is mainly to complete the judgement to load legitimacy by REID (RFID), RFID recognition system is mainly made up of reader and electronic tag, when picking up end with the energy of electronic tag while entering the radio-frequency antenna working region of energy transmitting terminal, the radio-frequency antenna of transmitting terminal receives the carrier signal of sending from electronic tag, be sent to reader through antenna adjustments device, reader carries out delivering to after demodulation code the master controller of energy transmitting terminal to the signal receiving, judged the legitimacy of load according to electronic tag data by master controller.While only recognizing legal load, master controller just makes energy transmitting terminal enter normal work, and energy is radioed to load, otherwise refusal is to load electric energy transmitting.
Visible, RFID load recognition technology is that the radiofrequency signal based on certain frequency is carried out signal transmission in essence, due to the existence of magnetic energy converting machine structure in ICPT system and high-frequency electrical energy inverter, RFID radiofrequency signal is vulnerable to the interference of electromagnetic field of high frequency in the wireless transmission process of energy, likely can cause misreading erroneous judgement, reduce the accuracy of illegal load identification.In addition, RFID load recognition technology need to increase electronic tag and power supply thereof, reader, radio-frequency antenna, has also increased the cost of whole system, has reduced the reliability of system.
Summary of the invention
The object of this invention is to provide a kind of load validity decision method of induction type radio energy transmission system, the method can be differentiated the legitimacy of load more accurately, reliably, and does not increase new hardware, differentiates cost low, easy to implement.
It is that a kind of load validity decision method of induction type radio energy transmission system, the steps include: that the present invention realizes the technical scheme that its goal of the invention adopts
Energy transmitting terminal
A1, energy transmitting terminal inject small high-frequency alternating current by controller control inverter circuit to transmitting coil, produce faint excitatory magnetic field; And detect in real time, record transmitting coil electric current, the peak point of transmitting coil electric current is connected, obtain the envelope for reflecting transmitting coil current magnitude variation, from envelope, demodulate low frequency signal, again low frequency signal is converted to pulse train, and the key built-in with it mate checking, if be verified, judge that energy picks up the load of end legal, carry out the operation of A2 step; Otherwise repeat above operation.
A2, energy transmitting terminal inject specified high-frequency alternating current by controller control inverter circuit to transmitting coil, and radio energy transmission system enters normal biography energy operating state.
Energy picks up end
B, pick-up winding induce electromotive force under the faint excitatory magnetic field effect of energy transmitting terminal transmitting coil, provide electric energy through the backward BOOST DC transfer circuit of rectification circuit rectification, the electromotive force inducing when pick-up winding lower than set threshold value time, the controller control BOOST DC transfer circuit that energy picks up end is operated in low frequency modal, and switch controlling signal using the pulse train that contains authorization information as BOOST DC transfer circuit, make the amplitude of pick-up winding electric current that corresponding variation occur, and be coupled on the transmitting coil of energy transmitting terminal;
When the electromotive force inducing when pick-up winding exceedes the threshold value of setting, the controller control BOOST DC transfer circuit that energy picks up end is switched to high frequency mode, and energy picks up end and enters normal interrogation energy state.
Key of the present invention is:
The BOOST DC transfer circuit of wireless energy transfer system under conventional operation state in high frequency mode, be the size of adjustable output power by the duty ratio that changes switching signal, when duty ratio one timing, the amplitude of transmitting coil electric current is almost constant, but this pattern is difficult to validation signal load on it and detect.
Therefore, before load legitimate verification passes through, setting BOOST DC transfer circuit is operated under low frequency mode, the switching frequency of BOOST DC transfer circuit is well below system oscillation frequency, its operation principle is greatly different from traditional pattern: in the time that the power switch pipe in BOOST DC transfer circuit is closed, be in fact to pick up resonant circuit short circuit, from the decoupling zero of energy transmitting terminal circuit, through-put power is zero, and the amplitude of transmitting coil electric current increases gradually with it; After power switch pipe disconnects, system re-establishes magnetic circuit coupled relation, and energy picks up end work, and the amplitude of transmitting coil electric current also reduces thereupon gradually.Thereby on the amplitude of transmitting coil electric current changes, show as envelope form, the frequency of this envelope is exactly the switching frequency of BOOST DC transfer circuit.Thereby energy picks up side controller and opens and turn-off by checking signal controlling power switch pipe, validation signal can be loaded and is transferred on transmitting coil electric current with envelope form, by the envelope detection of energy transmitting terminal, just can demodulate from energy and pick up the load validation signal that end sends again.
Compared with prior art, the invention has the beneficial effects as follows:
One, load validation signal is carried in energy-transmission channel with the linear formula of energy envelope, be not vulnerable to electromagnetic interference, has guaranteed the reliability of signal transmission, thereby can be more accurately, reliably the legitimacy of load is judged.
Two, (energy picks up the power supply that end does not need to increase checking use yet directly to utilize energy transmitting terminal and energy to pick up generation, transmission and the identification load validation signals such as the existing controller of end, transmitting coil, pick-up winding, BOOST DC transfer circuit by software algorithm, its electric energy is provided by the faint excitatory magnetic field of energy transmitting terminal), complete the judgement to load legitimacy.And without increasing the extra device such as radio communication and signal modulation, the hardware cost of load identification is zero, be easy to realize.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the BOOST DC transfer circuit of the embodiment of the present invention transmitting coil current waveform of (low frequency operation pattern) in the time of proof load legitimacy.
Fig. 2 is the BOOST DC transfer circuit of the embodiment of the present invention transmitting coil current waveform under normal mode of operation (high-frequency work pattern).
Embodiment
Embodiment
A kind of embodiment of the present invention is that a kind of load validity decision method of induction type radio energy transmission system, the steps include:
Energy transmitting terminal
A1, energy transmitting terminal inject small high-frequency alternating current by controller control inverter circuit to transmitting coil, produce faint excitatory magnetic field; And detect in real time, record transmitting coil electric current, the peak point of transmitting coil electric current is connected, obtain the envelope for reflecting transmitting coil current magnitude variation, from envelope, demodulate low frequency signal, again low frequency signal is converted to pulse train, and the key built-in with it mate checking, if be verified, judge that energy picks up the load of end legal, carry out the operation of A2 step; Otherwise repeat above operation.
A2, energy transmitting terminal inject specified high-frequency alternating current by controller control inverter circuit to transmitting coil, and radio energy transmission system enters normal biography energy operating state.
Energy picks up end
B, pick-up winding induce electromotive force under the faint excitatory magnetic field effect of energy transmitting terminal transmitting coil, provide electric energy through the backward BOOST DC transfer circuit of rectification circuit rectification, the electromotive force inducing when pick-up winding lower than set threshold value time, the controller control BOOST DC transfer circuit that energy picks up end is operated in low frequency modal, and switch controlling signal using the pulse train that contains authorization information as BOOST DC transfer circuit, make the amplitude of pick-up winding electric current that corresponding variation occur, and be coupled on the transmitting coil of energy transmitting terminal;
When the electromotive force inducing when pick-up winding exceedes the threshold value of setting, the controller control BOOST DC transfer circuit that energy picks up end is switched to high frequency mode, and energy picks up end and enters normal interrogation energy state.
Fig. 1 and Fig. 2 can explain operation principle of the present invention more intuitively.
Fig. 1 shows that BOOST DC transfer circuit verifies under operating state (low frequency operation pattern) in load, transmitting coil electric current shows as low frequency envelope characteristic, the frequency of the square-wave signal (switching signal of BOOST DC transfer circuit) in frequency and the figure of envelope is consistent, the controller of energy transmitting terminal is through the demodulation to envelope signal, can obtain the switching signal that energy picks up the BOOST DC transfer circuit of end is load authorization information, thereby realizes the identification to system load legitimacy.Obstructed out-of-date when checking, system cannot enter normal operating conditions, effectively avoids illegal load to enter energy dissipation or various potential safety hazard that excitatory magnetic field causes.
Fig. 2 shows that BOOST DC transfer circuit is under normal operating conditions (high-frequency work pattern), the amplitude (square-wave signal in figure is the switching signal of BOOST direct current varying circuit) of transmitting coil electric current is almost unchanged, do not have to form the energy envelope line being associated with square-wave signal in figure, do not comprise and be not easy to comprise any other information yet.
Claims (1)
1. a load validity decision method for induction type radio energy transmission system, the steps include:
Energy transmitting terminal
A1, energy transmitting terminal inject small high-frequency alternating current by controller control inverter circuit to transmitting coil, produce faint excitatory magnetic field; And detect in real time, record transmitting coil electric current, the peak point of transmitting coil electric current is connected, obtain the envelope for reflecting transmitting coil current magnitude variation, from envelope, demodulate low frequency signal, again low frequency signal is converted to pulse train, and the key built-in with it mate checking, if be verified, judge that energy picks up the load of end legal, carry out the operation of A2 step; Otherwise repeat above operation.
A2, energy transmitting terminal inject specified high-frequency alternating current by controller control inverter circuit to transmitting coil, and radio energy transmission system enters normal biography energy operating state.
Energy picks up end
B, pick-up winding induce electromotive force under the faint excitatory magnetic field effect of energy transmitting terminal transmitting coil, provide electric energy through the backward BOOST DC transfer circuit of rectification circuit rectification, the electromotive force inducing when pick-up winding lower than set threshold value time, the controller control BOOST DC transfer circuit that energy picks up end is operated in low frequency modal, and switch controlling signal using the pulse train that contains authorization information as BOOST DC transfer circuit, make the amplitude of pick-up winding electric current that corresponding variation occur, and be coupled on the transmitting coil of energy transmitting terminal;
When the electromotive force inducing when pick-up winding exceedes the threshold value of setting, the controller control BOOST DC transfer circuit that energy picks up end is switched to high frequency mode, and energy picks up end and enters normal interrogation energy state.
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| CN201310596823.0A CN103795154B (en) | 2013-11-22 | 2013-11-22 | A kind of load validity decision method of induction type radio energy transmission system |
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| CN201310596823.0A CN103795154B (en) | 2013-11-22 | 2013-11-22 | A kind of load validity decision method of induction type radio energy transmission system |
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| CN103795154B CN103795154B (en) | 2016-11-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451818A (en) * | 2016-10-25 | 2017-02-22 | 哈尔滨工业大学 | Wheel hub motor wireless power supply system based on magnetic coupling resonance |
| CN110829618A (en) * | 2019-10-22 | 2020-02-21 | 国网江西省电力有限公司电力科学研究院 | Directional transmission system of multi-load wireless power transmission system |
| CN112154079A (en) * | 2018-05-24 | 2020-12-29 | Abb瑞士股份有限公司 | Method of pairing an electric vehicle and a power terminal in an electric station for electric vehicles |
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| CN102239619A (en) * | 2008-10-03 | 2011-11-09 | 捷通国际有限公司 | Power system |
| CN103094996A (en) * | 2013-01-10 | 2013-05-08 | 李鹏 | Wireless power transmission system and realizing method thereof |
| CN103178621A (en) * | 2011-12-19 | 2013-06-26 | 鸿富锦精密工业（深圳）有限公司 | Wireless power supply device and power supply method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006191276A (en) * | 2005-01-05 | 2006-07-20 | Ooita Ken | Transmitting device for electric power and information by proximity magnetic field coupling |
| CN102239619A (en) * | 2008-10-03 | 2011-11-09 | 捷通国际有限公司 | Power system |
| CN103178621A (en) * | 2011-12-19 | 2013-06-26 | 鸿富锦精密工业（深圳）有限公司 | Wireless power supply device and power supply method |
| CN103094996A (en) * | 2013-01-10 | 2013-05-08 | 李鹏 | Wireless power transmission system and realizing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451818A (en) * | 2016-10-25 | 2017-02-22 | 哈尔滨工业大学 | Wheel hub motor wireless power supply system based on magnetic coupling resonance |
| CN106451818B (en) * | 2016-10-25 | 2018-12-11 | 哈尔滨工业大学 | Hub motor wireless power supply system based on magnetic coupling resonance |
| CN112154079A (en) * | 2018-05-24 | 2020-12-29 | Abb瑞士股份有限公司 | Method of pairing an electric vehicle and a power terminal in an electric station for electric vehicles |
| CN112154079B (en) * | 2018-05-24 | 2023-09-01 | Abb电动交通有限公司 | Method for pairing an electric vehicle and a power terminal in a power station for an electric vehicle |
| US11787296B2 (en) | 2018-05-24 | 2023-10-17 | ABB E-mobility B.V. | Method for pairing electric vehicles and power terminals in a power station for electric vehicles |
| CN110829618A (en) * | 2019-10-22 | 2020-02-21 | 国网江西省电力有限公司电力科学研究院 | Directional transmission system of multi-load wireless power transmission system |
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| CN103795154B (en) | 2016-11-09 |
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Effective date of registration: 20180817 Address after: 610097 No. 1, unit 2, Tong Yuan Garden, 836 Xipu campus road, PI Du District, Chengdu, Sichuan, 04 Co-patentee after: CHENGDU GUOJIA ELECTRICAL ENGINEERING CO., LTD. Patentee after: He Zhengyou Address before: 610031 No. two, section 111, ring road, Chengdu, Sichuan, China Patentee before: Southwest Jiaotong University |
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Effective date of registration: 20210414 Address after: No.8, unit 1, building 15, no.111-40, Section 1, 2nd Ring Road North, Jinniu District, Chengdu, Sichuan 610000 Patentee after: He Zhengyou Patentee after: CHENGDU GUOJIA ELECTRICAL ENGINEERING Co.,Ltd. Patentee after: Li Yong Address before: 610097 No. 1, unit 2, Tong Yuan Garden, 836 Xipu campus road, PI Du District, Chengdu, Sichuan, 04 Patentee before: He Zhengyou Patentee before: CHENGDU GUOJIA ELECTRICAL ENGINEERING Co.,Ltd. |
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Effective date of registration: 20210429 Address after: No.1, 6th floor, building 1, 88 Tianchen Road, high tech Zone, Chengdu, Sichuan 610000 Patentee after: Chengdu aitneng Electric Technology Co.,Ltd. Address before: No.8, unit 1, building 15, no.111-40, Section 1, 2nd Ring Road North, Jinniu District, Chengdu, Sichuan 610000 Patentee before: He Zhengyou Patentee before: CHENGDU GUOJIA ELECTRICAL ENGINEERING Co.,Ltd. Patentee before: Li Yong |