CN107769400A - Illegal load detection method based on wireless power transmission passage - Google Patents
Illegal load detection method based on wireless power transmission passage Download PDFInfo
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- CN107769400A CN107769400A CN201710779827.0A CN201710779827A CN107769400A CN 107769400 A CN107769400 A CN 107769400A CN 201710779827 A CN201710779827 A CN 201710779827A CN 107769400 A CN107769400 A CN 107769400A
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Abstract
The present invention discloses a kind of illegal load detection method based on wireless power transmission passage, including high-frequency electromagnetic coupling mechanism and load, and the high-frequency electromagnetic coupling mechanism includes primary coil and secondary coil.Detection method comprises the following steps：（1）The square-wave signal that a frequency is f1 is modulated in load；（2）Control load carries out break-make with frequency f1；（3）The square wave frequency of primary coil input current is detected, is designated as f2；（4）If | f2 f1 | the preset value ε given less than or equal to one, load is legal load, conversely, being illegal load.The load torque identification signal of the present invention directly transmits in energy-transmission channel, avoids the interference in magnetic field in transmitting, improves discrimination.This method has simplicity, rapidity and accuracy, meets in the application of electric automobile online wireless power, automobile residence time on single guide rail coil very short current conditions.
Description
Technical field
The invention belongs to electric automobile wireless charging technical field, and in particular to a kind of based on wireless power transmission passage
Illegal load detection method.
Background technology
Transmitting non-contact electric energy (CPT) technology based on electromagnetic induction coupling principle adds the flexibility of electrical equipment,
The defects of compensate for the abrasion of device present in conventional contact electric energy transmission means, carbon deposit and electric spark, therefore be a kind of
Safe and reliable, flexible electric energy accesses new technology.However, because CPT technologies are still at an early stage, the efficiency of system（Transmission
Power and efficiency）It is also relatively low, it have impact on its promotion and application.
In wireless charging system for electric automobile, larger air gap between the former and deputy side of system be present, and be outdoor ring
Border, wireless charging power emission coil top may have debris, metallics or organism, and these are in wireless charging mistake
The abnormal object being present in journey between former and deputy side is referred to as foreign matter.In charging process, there is very strong alternation magnetic between air gap
, when organism is strayed into transmission space, its health can be impacted；When medium is that insulator or resistivity are higher not
During good conductor, induced electromotive force will not produce larger vortex, cause power attenuation also smaller；But if medium is led for metal
Body, because its resistivity is relatively low, identical electromotive force will produce larger vortex, so as to produce larger power attenuation, not only
Efficiency is reduced, and the eddy-current heating of metal will also bring huge potential safety hazard to system.Therefore, quick foreign bodies detection is
The guarantee of system safety operation.
The content of the invention
To overcome the above-mentioned problems in the prior art, present invention offer one kind is simple and reliable, the degree of accuracy is high, quick
Illegal load detection method based on wireless power transmission passage, accurately to detect wireless charging system for electric automobile transmitting coil
Debris, metallics or the organism of top, ensure the specific aim of energy transmission, the safe operation of safeguards system, for reality
Existing above-mentioned purpose, the technical solution adopted by the present invention are：
Illegal load detection method based on wireless power transmission passage, including high-frequency electromagnetic coupling mechanism and load, the height
Frequency electromagnetic coupling mechanisms include primary coil and secondary coil, the secondary coil and the load electrical connection, including following step
Suddenly：
S1：The square-wave signal that one frequency of generation is f1；
S2：The square-wave signal is modulated in the load；
S3：The load is controlled to carry out break-make with frequency f1；
S4：The square wave frequency of the primary coil input current is detected, is designated as f2；
S5：Calculating Δ f=| f2-f1 |；
S6:If Δ f is less than or equal to a given preset value ε, the load is legal load, conversely, the load
For illegal load.
Preferably, square-wave signal described in step S1 is generated using FPGA control panels.
Preferably, primary coil input current square wave frequency is detected by FPGA control panels described in step S4.
In summary, compared with other technologies, the invention has the advantages that：
（1）Because load torque identification signal is reflected directly on primary coil input current, directly transmitted in energy-transmission channel.
Using detection method of the present invention, it is not necessary to which extra coupling coil is transmitted；
（2）During electric automobile wireless charging, there is very strong alternating magnetic field between primary coil and secondary coil.Using this
The detection method is invented, energy effective detection organism is strayed into transmission space, prevents from impacting its health；
（3）When the medium between primary coil and secondary coil is insulator or the higher non-conductor of resistivity, induced electricity
Kinetic potential will not produce larger vortex, cause power attenuation also smaller.Using detection method of the present invention, such medium is deposited
Do not influenceing the normal work of system；
（4）If the medium between primary coil and secondary coil is metallic conductor, because its resistivity is relatively low, identical electromotive force is just
Larger vortex can be produced, so as to produce larger power attenuation, not only reduces efficiency, and the eddy-current heating of metal will also
Huge potential safety hazard is brought to system., can effective guarantee system safety operation using detection method of the present invention；
（5）Detection method of the present invention, there is rapidity and accuracy, meet in the online power applications of electric automobile, vapour
Residence time of the car on single guide rail coil very short current conditions.
Brief description of the drawings
Fig. 1 is the fundamental diagram of the illegal load detection method of the invention based on wireless power transmission passage.
Fig. 2 is the overhaul flow chart of the illegal load detection method of the invention based on wireless power transmission passage.
Embodiment
As shown in figure 1, the illegal load detection method based on wireless power transmission passage, including high-frequency electromagnetic coupling mechanism
With load RL, the high-frequency electromagnetic coupling mechanism includes primary coil L1 and secondary coil L2, and the energy in power network is through over commutation
After filtering, current stabilization control, high-frequency inversion high-frequency energy, the secondary coil L2 being arranged on electric automobile are injected to primary coil L1
Charging electric vehicle is given after the primary coil L1 conversion such as high-frequency energy, rectified, voltage stabilizing is received by coupling.And primary side
Air gap between coil L1 and secondary coil L2, which then constitutes, is wirelessly transferred energy channel.
As shown in Figure 2, the illegal load detection method based on wireless power transmission passage, comprises the following steps：
S1：FPGA control panels are used to generate square-wave signal of the frequency for f1；
S2：The square-wave signal is modulated to the load RLOn；
S3：Control the load RLBreak-make is carried out with frequency f1, when system initialization is run, secondary coil L2 will be produced accordingly
The square-wave signal that a raw frequency is f1., also can be corresponding on primary coil L1 direct current input current due to the effect of coupling
One is demodulated close to the square-wave signal that frequency is f1；
S4：Using the square-wave signal frequency of FPGA control panels detection primary coil L1 direct current input currents, f2 is designated as；
S5：Calculating Δ f=| f2-f1 |；
S6:If Δ f is less than or equal to a given preset value ε, R is loadedLFor legal load, now stop sender
Ripple signal, holding circuit is open-minded, and system enters the normal power transmission stage.Conversely, i.e. Δ f>ε, then judge load RLTo be illegal
Load, deenergization and alarm immediately.
It should be further stated that above-mentioned ε is the minimum tolerance value of one about zero.
During electric automobile wireless charging, being wirelessly transferred in energy channel between primary coil L1 and secondary coil L2
In the presence of very strong alternating magnetic field.Therefore, when organism is strayed into transmission space, its health can be impacted；And ought wirelessly it pass
When medium present in defeated energy channel is insulator or resistivity higher non-conductor, induced electromotive force will not produce compared with
Big vortex, cause power attenuation also smaller, the presence of such medium does not influence the normal work of system；And work as and be wirelessly transferred energy
When medium present in amount passage is metallic conductor, because its resistivity is relatively low, identical electromotive force will produce larger vortex,
So as to produce larger power attenuation, not only reduce efficiency, and the eddy-current heating of metal will also be brought to system it is huge
Potential safety hazard.Therefore, the illegal load of quick detection is the guarantee of system safety operation.As shown in Figure 2, detection method of the invention
By to loading RLBy the coupling between secondary coil L2 and primary coil L1 after loading, modulated square wave signal, will load
Identification signal is reflected on primary coil L1 direct current input current, then is demodulated from primary coil L1 direct current input current
Square-wave signal, load torque identification signal are directly transmitted in energy-transmission channel, it is not necessary to which extra coupling coil is transmitted, and is kept away
Exempt from the interference in magnetic field in transmitting, improve discrimination.Therefore, the illegal load detection method has simplicity, rapidity
And accuracy, meet in the online wireless power application of electric automobile, residence time of the automobile on single guide rail coil is very short
Current conditions.
Claims (3)
1. a kind of illegal load detection method based on wireless power transmission passage, including high-frequency electromagnetic coupling mechanism and load,
The high-frequency electromagnetic coupling mechanism includes primary coil and secondary coil, the secondary coil and the load electrical connection, and it is special
Sign is, comprises the following steps：
S1：The square-wave signal that one frequency of generation is f1；
S2：The square-wave signal is modulated in the load；
S3：The load is controlled to carry out break-make with frequency f1；
S4：The square wave frequency of the primary coil input current is detected, is designated as f2；
S5：Calculating Δ f=| f2-f1 |；
S6:If Δ f is less than or equal to a given preset value ε, the load is legal load, conversely, the load
For illegal load.
2. the illegal load detection method according to claim 1 based on electric automobile wireless energy transfer passage, it is special
Sign is that square-wave signal described in step S1 is generated using FPGA control panels.
3. the illegal load detection method according to claim 1 based on wireless power transmission passage, it is characterised in that step
Primary coil input current square wave frequency is detected by FPGA control panels described in rapid S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779827.0A CN107769400A (en) | 2017-09-01 | 2017-09-01 | Illegal load detection method based on wireless power transmission passage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779827.0A CN107769400A (en) | 2017-09-01 | 2017-09-01 | Illegal load detection method based on wireless power transmission passage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107769400A true CN107769400A (en) | 2018-03-06 |
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ID=61265680
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| CN201710779827.0A Pending CN107769400A (en) | 2017-09-01 | 2017-09-01 | Illegal load detection method based on wireless power transmission passage |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427500A (en) * | 2013-08-19 | 2013-12-04 | 广西电网公司电力科学研究院 | Detection device and detection method for illegal load of IPT (inductive power transfer) system |
| CN104781700A (en) * | 2012-09-17 | 2015-07-15 | 保罗·瓦尔有限公司和两合公司 | Metal foreign body-identification system for inductive energy transmission systems |
| CN105137489A (en) * | 2014-06-09 | 2015-12-09 | 中兴通讯股份有限公司 | Foreign matter detection method and device, and wireless charging control method and device |
| CN105226844A (en) * | 2014-05-27 | 2016-01-06 | 松下知识产权经营株式会社 | The power transmission device of Wireless power transmission system and Wireless power transmission system |
| CN106464035A (en) * | 2014-06-13 | 2017-02-22 | 诺基亚技术有限公司 | A method for determining an execution frequency of a foreign object detection method |
-
2017
- 2017-09-01 CN CN201710779827.0A patent/CN107769400A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104781700A (en) * | 2012-09-17 | 2015-07-15 | 保罗·瓦尔有限公司和两合公司 | Metal foreign body-identification system for inductive energy transmission systems |
| CN103427500A (en) * | 2013-08-19 | 2013-12-04 | 广西电网公司电力科学研究院 | Detection device and detection method for illegal load of IPT (inductive power transfer) system |
| CN105226844A (en) * | 2014-05-27 | 2016-01-06 | 松下知识产权经营株式会社 | The power transmission device of Wireless power transmission system and Wireless power transmission system |
| CN105137489A (en) * | 2014-06-09 | 2015-12-09 | 中兴通讯股份有限公司 | Foreign matter detection method and device, and wireless charging control method and device |
| CN106464035A (en) * | 2014-06-13 | 2017-02-22 | 诺基亚技术有限公司 | A method for determining an execution frequency of a foreign object detection method |
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Application publication date: 20180306 |
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