CN104779686A - Method for improving efficiency of ICPT (inductively coupled power transfer)-based non-contact charging for electric vehicle - Google Patents
Method for improving efficiency of ICPT (inductively coupled power transfer)-based non-contact charging for electric vehicle Download PDFInfo
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- 230000005674 electromagnetic induction Effects 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 108010023321 Factor VII Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005183 dynamical system Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- H02J7/025—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a method for improving the efficiency of ICPT (inductively coupled power transfer)-based non-contact charging for an electric vehicle. The method comprises the following steps: data of an ICPT system model are prepared; the frequency factor of a secondary side coil is adjusted to enable the transfer power P2 of the secondary side coil to be smaller than or equal to the load power Pload of the electric vehicle, and then the cross sectional areas of a primary side coil and the secondary side coil are adjusted to enable the current density of the primary side coil and the secondary side coil to be smaller than the maximum current density of the primary side coil and the secondary side coil; whether the current numbers of turns of the primary side coil and the secondary side coil are smaller than the maximum numbers of turns of the primary side coil and the secondary side coil is determined, and one is added to each of the current number of turns of the primary side coil and the current number of turns of the secondary side coil; whether combination of compensation topological structures of the primary and secondary side coils and the ICPT system improves the efficiency is judged, and the final coil is finished through optimization. The method has the benefits that the normal operation of the designed system is detected under the 2kW power standard, the efficiency is as high as 82%, and the wireless charging safety and sufficient energy use are improved effectively.
Description
Technical field
The invention provides the electric automobile contactless charge efficiency method of a kind of raising based on electromagnetic induction coupling principle.
Background technology
When Present Global auto industry faces the huge challenge of financial crisis and energy environment issues; Development of EV; realize the electrification of energy source of car dynamical system, promote the strategic transformation of orthodox car industry, defined extensive common recognition in the world.At present, China has put into effect many policies, helps and guide the fast development of electric automobile industry, and government is intended to the competitiveness accelerating to improve domestic electric motor car industry, shortens the maturity period, realizes " bend is overtaken other vehicles " to Automobile Industry Abroad.The critical period is stepped in the development of electric automobile, and Opportunity coexists with challenge.
The application of wireless charging technology on electric automobile is that the primary winding by being embedded in earth's surface realizes with the electromagnetic coupled electric energy transmitting of the secondary coil being fixed on vehicle chassis.Along with the development of electric automobile and mobile robot etc., the demand of wireless charging is increasing.Electrokinetic cell is charged, there is safety and environmental protection, the series of advantages such as full-automatic, non-maintaining.In three kinds of conventional at present wireless charging technology, because ICPT and ERPT is higher in the efficiency of transmission of moderate distance, be more suitable for charging electric vehicle.
Inductively coupled power transfer technology ICPT by the inductively magnetic circuit of traditional transformer separately, realizes the Energy Coupling without physical connection between power supply and load unit.By designing the different geometries of former secondary coil, and the number of turn of former secondary coil, the parametric variable such as cross-sectional area and relative position thereof are optimized and are compared, finally draw the method for the contactless charge efficiency of a kind of electric automobile based on ICPT system of optimum.
Summary of the invention
For prior art Problems existing, the invention provides the electric automobile contactless charge efficiency method of a kind of raising based on electromagnetic induction coupling principle, its objective is that the ICPT system of design optimization is come for charging batteries of electric automobile, close to the maximization reaching efficiency transmission.
For achieving the above object, the technical solution used in the present invention is to provide the electric automobile contactless charge efficiency method of a kind of raising based on electromagnetic induction coupling principle, the method is at primary coil external power supply, by what carry out charging to device systems under the energy-producing condition of electromagnetic induction coupling secondary coil, this device systems comprises the primary coil and the built-in secondary coil of electric automobile that guide rail lays, the sized turns of described former secondary coil is changed and the relative position of former secondary coil carries out contactless charging to batteries of electric automobile by the topological structure of electromagnetic induction coupled system, the method comprises the following steps:
A) data encasement of electromagnetic induction coupling system model, the input voltage comprising primary coil is set as 220V, the maximum number of turn of primary coil is set as 27 circles, and the maximum number of turn of secondary coil is set as 7 circles, and the maximum current density of primary coil is set as 5A/mm
2, the maximum current density of secondary coil is set as 4A/mm
2, the initial number of turn of primary coil and secondary coil is all set as 1 circle, and the cross-sectional area of primary coil is set as 2.5mm
2, the cross-sectional area of secondary coil is set as 10mm
2, the frequency factor of secondary coil is set as 1.
B), after data encasement completes, the frequency factor of adjustment secondary coil, makes the transfer power P of secondary coil
2the bearing power P of≤electric automobile
load, then adjust the cross-sectional area of primary coil and secondary coil, make the current density of former secondary coil be less than the maximum current density of former secondary coil.
C) after current density meets the demands, judge whether the existing number of turn of primary coil and secondary coil is less than the maximum number of turn of primary coil and secondary coil, and add one to the existing number of turn of primary coil and secondary coil.
Whether the ICPT system of the compensation topology structure and equipment that D) detect former secondary coil combines reaches the requirement of efficiency raising, has optimized final coil.
The effect of the present invention desirable optimized design approach that to be the raising that proposes of the method be applied to charging batteries of electric automobile based on ICPT system can realize the energy utilization rate of automobile batteries charging close to maximizing.By carrying out different tests, the normal operation of designed system is detected under the standard of a 2-kW power, result show the method help achieve one up to 82% efficiency, this efficiency realizes under even can having the environment of the large air channel of 15cm at one, effectively improves fail safe and the making full use of property of the energy of wireless charging.
Accompanying drawing explanation
Fig. 1 is the ICPT design system block diagram that band of the present invention compensates.
In figure:
1, the structure of former secondary coil is fixed, and input voltage sets, the maximum number of turn of the former secondary coil of initialization and maximum current density 2, change the geometry 3 of coil, the number of turn 4 of the former secondary coil of initialization, the cross-sectional area of the former secondary coil of initialization and the frequency factor 5 of secondary coil, the inductance of initialization primary coil and the inductance 6 of secondary coil, increase the frequency factor 7 of secondary coil, according to the feature 8 of the compensation topology structure of former secondary coil, judge the transfer power of secondary coil and the magnitude relationship formula 9 of bearing power, judge the current density of primary coil and the magnitude relationship formula 10 of maximum current density, increase the cross-sectional area 11 of primary coil, judge the current density of secondary coil and the magnitude relationship formula 12 of maximum current density, increase the cross-sectional area 13 of secondary coil, judge the number of turn of primary coil and the magnitude relationship formula 14 of the maximum number of turn, the primary coil number of turn adds one, the secondary coil number of turn constant 15, whether the compensation topology structure of former secondary coil and the ICPT system of equipment combine reaches the requirement 16 of efficiency raising, judge the number of turn of secondary coil and the magnitude relationship formula 17 of the maximum number of turn, the secondary coil number of turn adds one, the primary coil number of turn constant 18, optimize final coil
Embodiment
By reference to the accompanying drawings the electric automobile contactless charge efficiency method of raising of the present invention based on electromagnetic induction coupling principle is illustrated.
Raising of the present invention is the desirable optimized design approach being applied to charging batteries of electric automobile based on ICPT system based on the electric automobile contactless charge efficiency method of electromagnetic induction coupling principle, defines a new design factor K
d, the relating to parameters such as regional location, building-out capacitor that the cross-sectional area of it and optimal number coil, coil are appropriate.By the optimized ICPT system of design ideal, utilize the compensation topology structure that its four the most frequently used simultaneously, draw optimum compensation topology structure.Wherein the resonance frequency of ICPT system to four basic compensation topology structures indicates the disappearance of relevant bifurcation and the utilizing status of minimum copper billet material.
Raising of the present invention is based on the contactless charge efficiency method of electric automobile of electromagnetic induction coupling principle, the method is at primary coil external power supply, by what carry out charging to device systems under the energy-producing condition of electromagnetic induction coupling secondary coil, this device systems comprises the primary coil and the built-in secondary coil of electric automobile that guide rail lays, the sized turns of described former secondary coil is changed and the relative position of former secondary coil carries out contactless charging to batteries of electric automobile by the topological structure of electromagnetic induction coupled system, the method comprises the following steps:
A) data encasement of electromagnetic induction coupling system model, the input voltage comprising primary coil is set as 220V, the maximum number of turn of primary coil is set as 27 circles, and the maximum number of turn of secondary coil is set as 7 circles, and the maximum current density of primary coil is set as 5A/mm
2, the maximum current density of secondary coil is set as 4A/mm
2, the initial number of turn of primary coil and secondary coil is all set as 1 circle, and the cross-sectional area of primary coil is set as 2.5mm
2, the cross-sectional area of secondary coil is set as 10mm
2, the frequency factor of secondary coil is set as 1.
B), after data encasement completes, the frequency factor 6 of adjustment secondary coil, makes the transfer power P of secondary coil
2the bearing power P of≤electric automobile
load, then adjust the cross-sectional area of primary coil and secondary coil, make the current density of former secondary coil be less than the maximum current density of former secondary coil.
C) after current density meets the demands, judge whether the existing number of turn of primary coil and secondary coil is less than the maximum number of turn of primary coil and secondary coil, and add one to the existing number of turn of primary coil and secondary coil.
Whether the ICPT system of the compensation topology structure and equipment that D) detect former secondary coil combines reaches the requirement 15 of efficiency raising, has optimized final coil 18.
Described steps A) in, the structure of former secondary coil is fixed, and the number of turn 3 of the former secondary coil of initialization is a circle, the cross-sectional area 4 of the former secondary coil of initialization, the inductance of initialization primary coil and the inductance 5 of secondary coil.
Described step B) in, judge the transfer power of secondary coil and the magnitude relationship of bearing power 8, if transfer power P
2> bearing power P
load, then the frequency factor 6 of secondary coil must be increased, until transfer power P
2≤ bearing power P
loadthen the current density of primary coil and the magnitude relationship of maximum current density 9 is judged by measuring, judge the current density of secondary coil and the magnitude relationship of maximum current density 11, check whether the current density of secondary coil is less than the maximum current density of former secondary coil; If condition does not meet, the cross-sectional area 10 of corresponding increase primary coil and the cross-sectional area 12 of increase secondary coil respectively, until current density meets the demands.
Described step C) in, after current density meets the demands, judge the number of turn of primary coil and the magnitude relationship of the maximum number of turn 13, namely check whether the number of turn of primary coil is less than the maximum number of turn of known primary coil, if be less than, then judge the number of turn of secondary coil and the magnitude relationship of the maximum number of turn 16, whether the number of turn reexamining secondary coil is less than the maximum number of turn of secondary coil, if be not less than, then the primary coil number of turn adds one, and the secondary coil number of turn 14 is constant, if be less than, then the primary coil number of turn is constant, and the secondary coil number of turn 17 adds one.
Described step D) in, judge the number of turn of primary coil and the magnitude relationship of the maximum number of turn 13, namely check whether the number of turn of primary coil is less than the maximum number of turn of primary coil, if be not less than, then check that the compensation topology structure of former secondary coil and the ICPT system of this equipment combine the requirement 15 whether reaching efficiency and improve, if do not met, then need the geometry 2 changing primary coil and secondary coil, again verify, if met, then optimized.
As shown in Figure 1, the optimizing process of ICPT system needs to know that some are as preliminary parameters such as the maximum current density of coil turn, supply power voltage, coil and cross-sectional areas, namely the input voltage of primary coil is set as 220V, the maximum number of turn of primary coil is set as 27 circles, the maximum number of turn of secondary coil is set as 7 circles, and the maximum current density of primary coil is set as 5A/mm
2, the maximum current density of secondary coil is set as 4A/mm
2, the initial number of turn of primary coil and secondary coil is all set as 1 circle, and the cross-sectional area of primary coil is set as 2.5mm
2, the cross-sectional area of secondary coil is set as 10mm
2, the frequency factor of secondary coil is set as 1.
Flow process as shown in Figure 1, after data encasement completes, judges the transfer power of secondary coil and the magnitude relationship of bearing power 8, if transfer power P
2> bearing power P
load, then the frequency factor 6 of secondary coil must suitably be increased, until transfer power P
2≤ bearing power P
load, next judge current density and the maximum current density 5A/mm of primary coil
2magnitude relationship formula 9 and judge current density and the maximum current density 4A/mm of secondary coil
2magnitude relationship formula 11, check whether the current density of former secondary coil is less than the maximum current density of former secondary coil; If condition does not meet, the cross-sectional area 10 of corresponding increase primary coil and the cross-sectional area 12 of increase secondary coil, increase 0.2mm respectively
2to the 2.5mm that primary coil and the corresponding cross-sectional area of secondary coil are setting
2, 10mm
2, until the maximum current density that current density meets the primary coil of setting is 5A/mm
2, secondary coil maximum current density be 4A/mm
2requirement.
After current density meets the demands, judge the number of turn of primary coil and the magnitude relationship formula 13 of the maximum number of turn 27 circle, namely check whether the number of turn of primary coil is less than the maximum number of turn of known primary coil, if be less than, then judge the number of turn of secondary coil and the magnitude relationship formula 16 of the maximum number of turn 7 circle, whether the number of turn namely reexamining secondary coil is less than the maximum number of turn of known secondary coil, if be not less than, then the primary coil number of turn adds one, the secondary coil number of turn 14 is constant, return redesign, if be less than, then the primary coil number of turn is constant, the secondary coil number of turn 17 adds one, return redesign.
Judge the number of turn of primary coil and the magnitude relationship formula 13 of the maximum number of turn 27 circle, namely check whether the number of turn of primary coil is less than the maximum number of turn of known primary coil, if be not less than, whether the ICPT system of the compensation topology structure and equipment that then detect former secondary coil combines reaches the requirement 15 of efficiency raising, if do not met, then need the geometry 2 changing coil, then again verify optimization, if met, then optimize final coil 18.
Claims (5)
1. one kind is improved the contactless charge efficiency method of electric automobile based on electromagnetic induction coupling principle, the method is at primary coil external power supply, by what carry out charging to device systems under the energy-producing condition of electromagnetic induction coupling secondary coil, this device systems comprises the primary coil and the built-in secondary coil of electric automobile that guide rail lays, change the sized turns of described former secondary coil by the topological structure of electromagnetic induction coupled system and the relative position of former secondary coil carries out contactless charging to batteries of electric automobile, the method comprises the following steps:
A) data encasement of electromagnetic induction coupling system model, the input voltage comprising primary coil is set as 220V, the maximum number of turn of primary coil is set as 27 circles, and the maximum number of turn of secondary coil is set as 7 circles, and the maximum current density of primary coil is set as 5A/mm
2, the maximum current density of secondary coil is set as 4A/mm
2, the initial number of turn of primary coil and secondary coil is all set as 1 circle, and the cross-sectional area of primary coil is set as 2.5mm
2, the cross-sectional area of secondary coil is set as 10mm
2, the frequency factor of secondary coil is set as 1;
B), after data encasement completes, the frequency factor (6) of adjustment secondary coil, makes the transfer power P of secondary coil
2the bearing power P of≤electric automobile
load, then adjust the cross-sectional area of primary coil and secondary coil, make the current density of former secondary coil be less than the maximum current density of former secondary coil;
C) after current density meets the demands, judge whether the existing number of turn of primary coil and secondary coil is less than the maximum number of turn of primary coil and secondary coil, and add one to the existing number of turn of primary coil and secondary coil;
Whether the ICPT system of the compensation topology structure and equipment that D) detect former secondary coil combines reaches the requirement (15) of efficiency raising, has optimized final coil (18).
2. raising according to claim 1 is based on the contactless charge efficiency method of electric automobile of electromagnetic induction coupling principle, it is characterized in that: described steps A) in, the structure of former secondary coil is fixed, the number of turn (3) of the former secondary coil of initialization is a circle, the cross-sectional area of the former secondary coil of initialization and the frequency factor (4) of secondary coil, the inductance of initialization primary coil and the inductance (5) of secondary coil.
3. raising according to claim 1 is based on the contactless charge efficiency method of electric automobile of electromagnetic induction coupling principle, it is characterized in that: described step B) in, judge the transfer power of secondary coil and the magnitude relationship of bearing power (8), if transfer power P
2> bearing power P
load, then the frequency factor (6) of secondary coil must be increased, until transfer power P
2≤ bearing power P
loadthen the current density of primary coil and the magnitude relationship of maximum current density (9) is judged by measuring, judge the current density of secondary coil and the magnitude relationship of maximum current density (11), check whether the current density of former secondary coil is less than the maximum current density of former secondary coil; If condition does not meet, the cross-sectional area (10) of corresponding increase primary coil and the cross-sectional area (12) of increase secondary coil respectively, until current density meets the demands.
4. raising according to claim 1 is based on the contactless charge efficiency method of electric automobile of electromagnetic induction coupling principle, it is characterized in that: described step C) in, after current density meets the demands, judge the number of turn of primary coil and the magnitude relationship of the maximum number of turn (13), namely check whether the number of turn of primary coil is less than the maximum number of turn of known primary coil, if be less than, then judge the number of turn of secondary coil and the magnitude relationship of the maximum number of turn (16), whether the number of turn namely reexamining secondary coil is less than the maximum number of turn of secondary coil, if be not less than, then the primary coil number of turn adds one, the secondary coil number of turn (14) is constant, if be less than, then the primary coil number of turn is constant, the secondary coil number of turn (17) adds one.
5. raising according to claim 1 is based on the contactless charge efficiency method of electric automobile of electromagnetic induction coupling principle, it is characterized in that: described step D) in, judge the number of turn of primary coil and the magnitude relationship of the maximum number of turn (13), namely check whether the number of turn of primary coil is less than the maximum number of turn of primary coil, if be not less than, whether the ICPT system of the compensation topology structure and equipment that then detect former secondary coil combines reaches the requirement (15) of efficiency raising, if do not met, then need the geometry (2) changing primary coil and secondary coil, again verify, if met, then optimize.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105857106A (en) * | 2016-05-16 | 2016-08-17 | 天津大学 | Identification method for dynamic wireless charging targets of electric automobiles on basis of magnetoresistive sensor array |
| CN107276241A (en) * | 2017-05-10 | 2017-10-20 | 北京交通大学长三角研究院 | A kind of wireless power transmission adjusting method for offset error of being stopped based on tramcar |
| CN107749676A (en) * | 2017-11-20 | 2018-03-02 | 南通理工学院 | A kind of six ring type electric energy wireless transmission facilities |
| CN108281258A (en) * | 2018-01-16 | 2018-07-13 | 哈尔滨工业大学 | Asymmetric magnetic coupling arrangement based on centered magnetic field |
| CN111439142A (en) * | 2020-05-26 | 2020-07-24 | 中国人民解放***箭军工程大学 | Electromagnetic resonance coupling type wireless charging efficiency optimization method suitable for unmanned aerial vehicle |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105857106A (en) * | 2016-05-16 | 2016-08-17 | 天津大学 | Identification method for dynamic wireless charging targets of electric automobiles on basis of magnetoresistive sensor array |
| CN107276241A (en) * | 2017-05-10 | 2017-10-20 | 北京交通大学长三角研究院 | A kind of wireless power transmission adjusting method for offset error of being stopped based on tramcar |
| CN107276241B (en) * | 2017-05-10 | 2023-05-09 | 北京交通大学长三角研究院 | Wireless power transmission adjusting method based on tramcar parking offset error |
| CN107749676A (en) * | 2017-11-20 | 2018-03-02 | 南通理工学院 | A kind of six ring type electric energy wireless transmission facilities |
| CN108281258A (en) * | 2018-01-16 | 2018-07-13 | 哈尔滨工业大学 | Asymmetric magnetic coupling arrangement based on centered magnetic field |
| CN111439142A (en) * | 2020-05-26 | 2020-07-24 | 中国人民解放***箭军工程大学 | Electromagnetic resonance coupling type wireless charging efficiency optimization method suitable for unmanned aerial vehicle |
| CN111439142B (en) * | 2020-05-26 | 2022-03-04 | 中国人民解放***箭军工程大学 | Electromagnetic resonance coupling type wireless charging efficiency optimization method suitable for unmanned aerial vehicle |
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