CN104977620A - Energy transfer optimizing method for foreign object detection and magnetic saturation - Google Patents
Energy transfer optimizing method for foreign object detection and magnetic saturation Download PDFInfo
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- CN104977620A CN104977620A CN201510490529.0A CN201510490529A CN104977620A CN 104977620 A CN104977620 A CN 104977620A CN 201510490529 A CN201510490529 A CN 201510490529A CN 104977620 A CN104977620 A CN 104977620A
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- foreign object
- magnetic saturation
- wireless charging
- loss
- energy transfer
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Abstract
The invention discloses an energy transfer optimizing method for foreign object detection and magnetic saturation. When a foreign object is taken as a receiving end by mistake by a transmitting end, the energy loss can be generated, safety problems such as bursting, caused by instant over-large current, can be caused, and the foreign object which is unmonitored to be removed can disturb the normal operation of a wireless charging system. The magnetic saturation belongs to a physical property of a magnetic material, and the confusion in the foreign object detection process can be caused by the volt-ampere expression of the magnetic saturation, so that the energy loss can be caused. The invention aims at that in the wireless charging process, the foreign object is detected, the loss caused by the foreign object and the magnetic saturation is avoided, and the energy transfer of the wireless charging system is optimized.
Description
Technical field
FOD(Foreign Object Detection), namely in wireless charging process, monitoring can not the foreign matter (majority is metal) of sensed charging for monitoring foreign bodies, stops carrying out Energy Transfer to it thus avoids causing negative effect such as object overheated grade.Magnetic saturation is a kind of physical characteristics of magnetic material, and refer to the restriction of permeability magnetic material due to physical arrangement, the magnetic flux passed through cannot infinitely increase, thus remains on the state of some.Wireless charging technology (Wireless charging technology), also known as doing non-contact inductive charging, come from wireless power conveying technology, near field is utilized to respond to, inductive coupling, transmit its energy to power device by power-supply unit, this device uses the energy received to charge to battery, and simultaneously for itself running.The wireless charging standard of main flow has three kinds: Qi standard, PMA standard, A4WP standard.FOD and magnetic saturation all likely occur in above-mentioned three kinds of wireless charging standards.The present invention is intended to monitor and gets rid of foreign matter and magnetic saturation, is applicable to Qi standard and PMA standard.
Background technology
Based on wireless charging system framework, the process of two kinds of equipment (referring generally to energy transmitting terminal and energy acceptance end) transferring electric powers does not need the tangible electric wire existed by any physics.When transmitting terminal thinks foreign matter by mistake receiving end, not only can produce power loss electric current moment be also likely caused excessively to cause the safety problems such as blast, so the foreign matter of not monitoring eliminating can disturb the normal work of wireless charging system.Magnetic saturation is a kind of physical characteristics of magnetic material, and its volt-ampere of performance can cause monitoring foreign bodies process to be obscured, and produce power loss.The present invention is intended to monitor foreign matter in wireless charging process, avoids the loss that foreign matter and magnetic saturation cause, and optimizes the Energy Transfer of wireless charging system.
Summary of the invention
We first learn about wireless charging system framework, as Fig. 1 depicts a mobile terminal to carry out wireless charging system framework by recharging base.Mobile terminal can be that regular handset, smart mobile phone, Hand Personal Computer, Pad etc. can the portable electronic products of electromagnetic induction wireless charging.When recharging base detects mobile terminal (distance of mobile terminal recharging base distance is less than 1cm), the energy conversion unit of transmitting terminal supplies energy to transmitting coil, produces magnetic field.At receiving end, magnetic field energy is received by receiving coil and changes electric current into, and meanwhile, received energy unit is to the load supplying of mobile terminal.Transmitting terminal and receiving end have one to communicate and control module, are responsible for induction and management wireless charging process.
In wireless charging process, recharging base can by detect the emitting voltage of transmitting terminal and transmitter current (namely transmitting coil two ends voltage and flow through the electric current of transmitting coil) calculate the transmitting energy (P=I*V) of transmitting terminal.In like manner, mobile terminal can by detect the receiver voltage of receiving end and received current (namely receiving coil two ends voltage and flow through the electric current of transmitting coil) and be supplied to transmitting terminal, then will by the transmitting energy (P=I*V) of communication and control module calculating receiving end by recharging base, and to calculate energy loss Loss be transmitting energy (the Loss=P that the transmitting energy of transmitting terminal deducts receiving end
tX-P
rX).
accompanying drawing illustrates:below in conjunction with accompanying drawing, the present invention is further described with enforcement.
Fig. 1 is wireless charging system frame diagram
Fig. 2 is Energy Transfer Optimizing Flow
embodiment:the present invention is to monitoring foreign bodies and avoid magnetic saturation, thus the flow process of optimization energy transmission is as shown in Figure 2:
W0.Ping---transmitting terminal sends Ping order every the several seconds, has judged whether that object is in chargeable scope.
W1. transmitting terminal is opened---when the judged result of W0 is for being YES, wakes transmitting terminal up and making it start working.
W2.W9. transmitting terminal voltage V is read
tX, electric current I
tX---read transmitting terminal voltage and current, calculate transmitting terminal transmitting energy P
tX=I
tX* V
tX.
W3.W10. receiving-end voltage I is read
rX, electric current I
rX---read receiving-end voltage and electric current, calculate receiving end transmitting energy P
rX=I
rX* V
rX.
W4.W11. new loss Lossnew is calculated
---calculate new loss Lossnew=P
tX-P
rX.
W5. judging whether loss exceedes threshold value---different wireless charging standards has the different threshold value of regulation, such as the, during threshold value of Qi standard 0.25W.
W6. charging is continued---when the judged result of W5 is no NO, wireless charging system normally works, and transmitting terminal will continue step W2 after continuing charging a period of time to receiving end.
W7. storing loss value is Loss---when the judged result of W5 is for being YES, foreign matter or magnetic saturation state when being likely receiving end full lattice electricity, object being described, next, first the result of W4 calculating being stored in variables L oss, i.e. Loss=Lossnew.
W8. transmitting terminal electric current I is reduced
tXfixed proportion---transmitting terminal electric current I
tXneed to be reduced fixed numbers, namely reduce according to fixed proportion, such as new I
tXbe reduced to former I
tX90%, or former I
tX80%, or be less than the former I of 100%
tXany one percentage.
W12. △ Loss=Loss-Lossnew is calculated---according to the change of formulae discovery energy loss.
W13. △ Loss whether with transmitting terminal electric current I
tXequal proportion---the change △ Loss judging energy loss whether with transmitting terminal electric current I
tXchange equal proportion, if such as I
tXbe reduced to I
tX90%, i.e. △ I
tXbe 10%, so need to calculate the whether ratio of Loss whether also 10% in W1 shared by △ Loss in W6 nearly.
W14. exit magnetic saturation state and continue charging---when the judged result of W13 is no NO, explanation is magnetic saturation state, continues charging after exiting magnetic saturation state.
W15. FOD is defined as foreign matter stopping charging---and when the judged result of W13 is for being YES, illustrating that object is foreign matter (when the situation of the full lattice of receiving end electricity also can see foreign matter as), stopping charging.
Claims (2)
1. whether exceed threshold value according to the loss calculating Energy Transfer in wireless charging process, judge that whether wireless charging system is in normal operating conditions.
2., based on the requirement of right 1, according to judging that magnetic is satisfied the standard exclusion magnetic saturation situation of state, carry out FOD monitoring foreign bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510490529.0A CN104977620A (en) | 2015-08-12 | 2015-08-12 | Energy transfer optimizing method for foreign object detection and magnetic saturation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510490529.0A CN104977620A (en) | 2015-08-12 | 2015-08-12 | Energy transfer optimizing method for foreign object detection and magnetic saturation |
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| CN104977620A true CN104977620A (en) | 2015-10-14 |
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| CN201510490529.0A Pending CN104977620A (en) | 2015-08-12 | 2015-08-12 | Energy transfer optimizing method for foreign object detection and magnetic saturation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993563A (en) * | 2015-08-12 | 2015-10-21 | 苏州宝润电子科技有限公司 | Method for preventing magnetic saturation and improving wireless charging efficiency |
| WO2017063135A1 (en) * | 2015-10-13 | 2017-04-20 | 苏州宝润电子科技有限公司 | Energy transmission optimization of foreign object monitoring and magnetic saturation |
| CN108802835A (en) * | 2018-03-13 | 2018-11-13 | 维沃移动通信有限公司 | Wireless charging detection method, device and mobile terminal, wireless charging system |
| CN109143383A (en) * | 2018-09-11 | 2019-01-04 | 上海楚山电子科技有限公司 | A kind of metallic foreign body recognition methods based on wireless charging technology |
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| US3676772A (en) * | 1970-08-18 | 1972-07-11 | Nasa | Metallic intrusion detector system |
| CN103036283A (en) * | 2012-12-06 | 2013-04-10 | 捷普科技（上海）有限公司 | Interval wireless charging communication device and interval wireless charging communication method |
| CN103229258A (en) * | 2010-09-16 | 2013-07-31 | Nec卡西欧移动通信株式会社 | Non-contact power transmission device |
| CN103852665A (en) * | 2014-01-10 | 2014-06-11 | 深圳市普林泰克科技有限公司 | Algorithm for directly detecting metal foreign bodies for wireless charger |
-
2015
- 2015-08-12 CN CN201510490529.0A patent/CN104977620A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3676772A (en) * | 1970-08-18 | 1972-07-11 | Nasa | Metallic intrusion detector system |
| CN103229258A (en) * | 2010-09-16 | 2013-07-31 | Nec卡西欧移动通信株式会社 | Non-contact power transmission device |
| CN103036283A (en) * | 2012-12-06 | 2013-04-10 | 捷普科技（上海）有限公司 | Interval wireless charging communication device and interval wireless charging communication method |
| CN103852665A (en) * | 2014-01-10 | 2014-06-11 | 深圳市普林泰克科技有限公司 | Algorithm for directly detecting metal foreign bodies for wireless charger |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993563A (en) * | 2015-08-12 | 2015-10-21 | 苏州宝润电子科技有限公司 | Method for preventing magnetic saturation and improving wireless charging efficiency |
| WO2017063135A1 (en) * | 2015-10-13 | 2017-04-20 | 苏州宝润电子科技有限公司 | Energy transmission optimization of foreign object monitoring and magnetic saturation |
| CN108802835A (en) * | 2018-03-13 | 2018-11-13 | 维沃移动通信有限公司 | Wireless charging detection method, device and mobile terminal, wireless charging system |
| CN109143383A (en) * | 2018-09-11 | 2019-01-04 | 上海楚山电子科技有限公司 | A kind of metallic foreign body recognition methods based on wireless charging technology |
| WO2020052023A1 (en) * | 2018-09-11 | 2020-03-19 | 上海楚山电子科技有限公司 | Metal foreign object identification method based on wireless charging technology |
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Application publication date: 20151014 |