CN103852631A - Algorithm for indirectly detecting metal foreign bodies for wireless charger - Google Patents
Algorithm for indirectly detecting metal foreign bodies for wireless charger Download PDFInfo
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- CN103852631A CN103852631A CN201410011832.3A CN201410011832A CN103852631A CN 103852631 A CN103852631 A CN 103852631A CN 201410011832 A CN201410011832 A CN 201410011832A CN 103852631 A CN103852631 A CN 103852631A
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Abstract
The invention relates to an algorithm for indirectly detecting metal foreign bodies for a wireless charger. When the metal foreign bodies appear between the wireless charger and mobile equipment, eddy-current loss of the metal foreign bodies is caused, heat is generated, and accordingly ignition and other security problems are brought. The algorithm is used for detecting heating of the metal foreign bodies and terminating power transmission in time. The core content of the algorithm is as follows: the difference between power transmitted from the transmitting end of the wireless charger and power received from the receiving end of the mobile equipment is detected so that loss power of the metal foreign bodies can be calculated, if the loss power exceeds a certain set value, power transmission is terminated, and thus the temperature of the metal foreign bodies is prevented from further rising. An indirect detection method is used for detecting transmission power, the vector difference of a voltage effective value and a current effective value is deduced so that a vector phase difference can be obtained, accordingly the vector phase difference between active power and apparent power is obtained, and the effective value of the active power is solved through the effective value of the apparent power and the vector difference; compared with a direct detection method, cost is obviously reduced.
Description
Technical field
At the heating problem the present invention relates to for preventing that on wireless charger, metallic foreign body causes.This algorithm can accurate Calculation metallic foreign body through overcorrect heating, to wireless charger, critical effect is played in security in use.
Range of application of the present invention is mainly induction wireless charger (QI standard), and magnetic resonance type wireless charger, for the occasion of single power consumption accurate Calculation.
Background technology
In existing conventional wireless charging technology, QI standard becomes the wireless charging standard of main flow gradually.If put into metal object between the transmitting terminal of wireless charger and receiving end, the magnetic field of interchange can produce eddy current loss and produce heat in metal, and this heat can produce high temperature, and security incident occurs.In up-to-date QI standard, there is the requirement of surveying about metal foreign matter prospecting, and be mandatory provision, in order to detect accurately metallic foreign body, the loss that the detection algorithm that the present invention proposes contributes to accurately to detect and calculate metallic foreign body, if loss exceeds predetermined value, wireless charger will stop power transmission.
Method for recognizing impurities in QI standard adopts and calculates the active power loss that foreign matter causes, and when its loss exceedes after judgment threshold, is judged to be to exist foreign matter.Its relational expression is as follows:
The active power that receiving end receives is to be issued the controller of transmitting terminal by the mode of communication by receiving end controller, carries out the judgement of foreign matter identification for transmitting terminal controller.In formula, the active loss of transmitting terminal circuit is a more unobtainable information, and it mainly comprises the electric energy of the components and parts circuit loss such as inverter bridge semiconductor switch and transmitting terminal control, demonstration.Wherein the loss of semiconductor switch is subject to the impacts such as supply voltage, switching frequency, temperature, more difficult calculating.And the electric energy of the transmitting terminal components and parts circuit loss information of a more difficult assessment especially.The active power of above each several part loss is all more difficultly to calculate by controlling software, cannot obtain result accurately, causes the precision of foreign matter identification to reduce.
Core of the present invention, by detecting the active power of sending-end inductance coil output, has been avoided detection and calculating to transmitting terminal circuit loss, has improved the precision of foreign matter identification, and next joint of detailed former reason is set forth.
Summary of the invention
Wireless charging metallic foreign body indirect detection algorithm of the present invention, comprises two-part content, and Part I is hardware handles part, and Part II is software processing part.Concrete theoretical principle is as follows:
As shown in Figure 1, direct supply is reverse into alternating current by transmitting terminal to the structure of wireless charger, is added in the coil inductance of transmitting terminal, by alternating electromagnetic field, transfers its energy to receiving end coil.Core of the present invention is the active loss of calculating transmitting terminal circuit, for method for recognizing impurities provides foundation accurately and reliably.
The input of wireless charging transmitting terminal active power, output, each several part loss distribute as shown in Figure 2.If there is foreign matter, the loss that alternating electromagnetic field produces in foreign matter can be calculated with following formula:
The active loss of transmitting terminal circuit is a more unobtainable information, and it mainly comprises the electric energy of the components and parts circuit loss such as inverter bridge semiconductor switch and transmitting terminal control, demonstration.Core of the present invention is the electric current and voltage by measuring transmitting terminal coil, calculates the active power that transmitting terminal sends, thereby avoids calculating the active loss of transmitting terminal circuit.In fact the active power of transmitting terminal output can be expressed as following formula:
By the above, the active loss that foreign matter produces can be reduced to:
It is as follows that the active power of of ac is calculated formula:
Inductive drop:
Inductive current:
Applied power:
Active power mean value:
The method that the circuit of this formula is realized is as Fig. 3, and the voltage at transmitting terminal telefault two ends and the electric current flowing through are all AC sine amounts, after over-sampling modulate circuit, obtain semaphore.Voltage and current sample semaphore obtains voltage effective value U and current effective value I through true rms circuit, obtains the phasing degree of voltage and current through phase detector
, voltage effective value, CPU (central processing unit) is received at the phasing degree of current effective value and electric current and voltage.CPU (central processing unit) is according to above-mentioned active power mean value calculation formula, active power mean value in calculating, as foreign matter identification according to one of.And the eddy current loss of transmitting terminal coil can, by electric current and frequency, calculate according to coil loss computing formula.
Now the present invention is described in further detail with example by reference to the accompanying drawings.
Wireless charger is inputted by direct current, full bridge inverter, resonant inductance and resonant capacitance, driving circuit, load communication demodulator circuit, power calculation unit, current sample, input voltage sampling, resonant inductance voltage sample composition.Receiving end is by LCC double-resonant circuit, load communication modulation circuit, and power calculation unit, the circuit such as voltage sample form.The power that receiving end receives receiving end by load-modulate circuit sends to transmitting terminal, transmitting terminal is formed low and high level load disturbance and is given the microprocessor of transmitting terminal by the load demodulator circuit of communicating by letter, microprocessor is translated into needed information through the communication protocol of agreement, then judges whether to stop power transmission by calculating.
Brief description of the drawings
Fig. 1 is wireless charging system block diagram;
Fig. 2 is that metallic foreign body detects theory diagram;
Fig. 3 is power calculation theory diagram;
embodiment
The present invention adopts detection method, and specific implementation method is such:
The voltage at transmitting terminal coil two ends can Direct Sampling obtain, and sends into difference channel and carries out signal conversion.The electric current that flows through transmitting terminal coil can obtain through sampling resistor or current sensor, carries out signal conversion through difference channel.Another indirectly mode be the harmonic components of ignoring in electric current, the voltage peak at Direct Sampling and inductance series capacitance two ends, divided by 1.414, is the current effective value that flows through inductance and electric capacity.
Effective value counting circuit is used for the mean value of effective value of calculating voltage and current signal, and this circuit can be realized with various ways.Wherein a kind of mode is, by voltage and current signal, through signed magnitude arithmetic(al) circuit, as bridge rectifier circuit, then process low-pass filter obtains the mean value of effective value.
Phase detector is used for obtaining the phasing degree of voltage and current signal, this signal is sent into central processor unit and calculate sinusoidal quantity.The voltage and current signal of sample circuit output, through zero passage comparator circuit, is shaped to square-wave signal.Then, this two-way voltage, current shaping signal are obtained to the square-wave signal that comprises phase angle information through XOR circuit.This signal is sent into central processor unit.
Central processor unit is used for calculating the active power mean value of transmitting terminal output, carries out the judgement of foreign matter identification.Concrete mode adopts the effective value mean value of 2 AD mouth sampled voltages and electric current, calculates the high level time width of the square wave of phase detector output with capturing unit, calculates with this
.
Software algorithm is mainly completed by central processor unit, as shown in Figure IV.While there is rising edge or negative edge in the square-wave signal that outputs to central processor unit when phase detector, enter capture interrupt service routine, deduct the moment of rising edge with the moment of negative edge, be the phase differential of voltage and current signal, phase differential is carried out to sinusoidal calculations, obtain power factor.
In master routine, be converted to the mean value sampling of voltage and current effective value with AD, voltage, current effective value and power factor are multiplied each other, obtain the mean value of the active power of telefault output.The size of inductive current and the eddy current loss of frequence estimation telefault for central processing unit, the active power mean value calculating is above deducted to the received power data that coil eddy current loss and receiving end send over, obtain the active power of metallic foreign body loss, when this active power is greater than the decision threshold setting, predicate and have foreign matter, enter foreign matter processing links.
Claims (3)
1. wireless charger metallic foreign body indirect detection algorithm in the present invention, power calculation method feature is, the difference that sends the mean value of active power and the mean value of the active power that receives is as the standard that whether has metallic foreign body, if this difference power is greater than a predetermined value, so just thinks and have metallic foreign body heating.
2. the feature of power calculation method as claimed in claim 1 is, detect the effective value of the voltage and current at resonant inductance two ends, then send into respectively the AD conversion of microprocessor, calculate vector phase angular difference, utilize this phase differential to calculate the active power mean value of transmission.
3. transmission active power calculating method as claimed in claim 2 is, with the mean value of the vector phase angular difference of voltage and current and the mean value calculation active power of applied power.
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515216A (en) * | 2014-10-07 | 2016-04-20 | 日立-Lg数据存储韩国公司 | Apparatus and method for transmitting power wirelessly |
| CN105990887A (en) * | 2015-02-15 | 2016-10-05 | 盛群半导体股份有限公司 | Wireless charging device and wireless charging abnormality detection method |
| CN106972651A (en) * | 2017-05-03 | 2017-07-21 | 南京农业大学 | A kind of electric automobile wireless charging foreign matter detection system |
| CN107005090A (en) * | 2014-12-11 | 2017-08-01 | 皇家飞利浦有限公司 | Wireless induction power is transmitted |
| CN107026516A (en) * | 2016-02-01 | 2017-08-08 | 飞思卡尔半导体公司 | Receiver in wireless charging system removes detection |
| CN107482710A (en) * | 2017-07-31 | 2017-12-15 | 北京小米移动软件有限公司 | Wireless charging method and terminal |
| CN108490249A (en) * | 2018-04-18 | 2018-09-04 | 深圳市全智芯科技有限公司 | A kind of detection method of wireless charging receiving terminal aging jig |
| CN108649712A (en) * | 2018-07-17 | 2018-10-12 | 宁波微鹅电子科技有限公司 | Radio energy transmitting terminal, wireless charging system and circuit module |
| CN108808892A (en) * | 2018-04-18 | 2018-11-13 | 富达通科技股份有限公司 | Metal foreign matter detection method of induction type power supply and power supply module thereof |
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| CN110392969A (en) * | 2019-06-05 | 2019-10-29 | 北京小米移动软件有限公司 | Wireless charging method, device and storage medium |
| CN110492625A (en) * | 2019-08-05 | 2019-11-22 | Oppo广东移动通信有限公司 | Wireless charging foreign matter detecting method and device, electronic equipment, storage medium |
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| US10686331B2 (en) | 2011-02-01 | 2020-06-16 | Fu Da Tong Technology Co., Ltd. | Signal modulation method and signal rectification and modulation device |
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| CN112564299A (en) * | 2015-03-04 | 2021-03-26 | 苹果公司 | Inductive power transmitter |
| CN112803617A (en) * | 2019-11-14 | 2021-05-14 | 华大半导体(成都)有限公司 | Foreign matter detection method and device applied to wireless charging |
| CN113098153A (en) * | 2021-04-13 | 2021-07-09 | 浙江泰米电子科技有限公司 | Foreign matter detection method of LCLP wireless charging system |
| CN113346637A (en) * | 2021-06-22 | 2021-09-03 | 哈尔滨工业大学 | Method for eliminating foreign matter harm in wireless charging system |
| US11128180B2 (en) | 2011-02-01 | 2021-09-21 | Fu Da Tong Technology Co., Ltd. | Method and supplying-end module for detecting receiving-end module |
| CN113452161A (en) * | 2021-07-02 | 2021-09-28 | 阳光电源股份有限公司 | Wireless charging device, metal foreign matter detection method thereof and wireless charging system |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147308A (en) * | 2006-10-24 | 2008-03-19 | 翰林Postech株式会社 | Non-contact charger available of wireless data and power transmission, charging battery-pack and mobile divice using non-contact charger |
| CN101447683A (en) * | 2007-11-30 | 2009-06-03 | 郑春吉 | Contactless multi-charger system and controlling method thereof |
| CN102377224A (en) * | 2010-08-13 | 2012-03-14 | 索尼公司 | Wireless charging system |
| US20120169137A1 (en) * | 2010-12-29 | 2012-07-05 | Gianpaolo Lisi | Resonant system for wireless power transmission to multiple receivers |
| US20120187772A1 (en) * | 2011-01-20 | 2012-07-26 | Triune Ip Llc | Wireless Power Transceiver System |
| CN202424281U (en) * | 2012-01-05 | 2012-09-05 | 南京理工大学 | Wireless lithium battery charging device |
| CN102694423A (en) * | 2011-03-23 | 2012-09-26 | 翰林Postech株式会社 | Method for controlling power transmission in wireless power transmission apparatus and power transmission apparatus |
| US20120306285A1 (en) * | 2011-06-01 | 2012-12-06 | Nam Yun Kim | Method and apparatus for detecting efficiency of wireless power transmission |
| WO2013035853A1 (en) * | 2011-09-09 | 2013-03-14 | 株式会社 テクノバ | Non-contact power supply device for use in mobile body |
| CN203039384U (en) * | 2012-12-12 | 2013-07-03 | 重庆市电力公司电力科学研究院 | Wireless charging system |
| CN103208865A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Overvoltage protecting device for resonance wireless power transmitting apparatus and controlling method thereof |
| CN103427498A (en) * | 2012-05-21 | 2013-12-04 | 德克萨斯仪器股份有限公司 | Systems and methods of reduction of parasitic losses in a wireless power system |
| CN103457332A (en) * | 2013-10-08 | 2013-12-18 | 平湖凌云信息科技有限公司 | Wireless charger device and wireless charging method |
-
2014
- 2014-01-11 CN CN201410011832.3A patent/CN103852631A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147308A (en) * | 2006-10-24 | 2008-03-19 | 翰林Postech株式会社 | Non-contact charger available of wireless data and power transmission, charging battery-pack and mobile divice using non-contact charger |
| CN101447683A (en) * | 2007-11-30 | 2009-06-03 | 郑春吉 | Contactless multi-charger system and controlling method thereof |
| CN102377224A (en) * | 2010-08-13 | 2012-03-14 | 索尼公司 | Wireless charging system |
| US20120169137A1 (en) * | 2010-12-29 | 2012-07-05 | Gianpaolo Lisi | Resonant system for wireless power transmission to multiple receivers |
| US20120187772A1 (en) * | 2011-01-20 | 2012-07-26 | Triune Ip Llc | Wireless Power Transceiver System |
| CN102694423A (en) * | 2011-03-23 | 2012-09-26 | 翰林Postech株式会社 | Method for controlling power transmission in wireless power transmission apparatus and power transmission apparatus |
| US20120306285A1 (en) * | 2011-06-01 | 2012-12-06 | Nam Yun Kim | Method and apparatus for detecting efficiency of wireless power transmission |
| WO2013035853A1 (en) * | 2011-09-09 | 2013-03-14 | 株式会社 テクノバ | Non-contact power supply device for use in mobile body |
| CN202424281U (en) * | 2012-01-05 | 2012-09-05 | 南京理工大学 | Wireless lithium battery charging device |
| CN103208865A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Overvoltage protecting device for resonance wireless power transmitting apparatus and controlling method thereof |
| CN103427498A (en) * | 2012-05-21 | 2013-12-04 | 德克萨斯仪器股份有限公司 | Systems and methods of reduction of parasitic losses in a wireless power system |
| CN203039384U (en) * | 2012-12-12 | 2013-07-03 | 重庆市电力公司电力科学研究院 | Wireless charging system |
| CN103457332A (en) * | 2013-10-08 | 2013-12-18 | 平湖凌云信息科技有限公司 | Wireless charger device and wireless charging method |
Cited By (40)
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| CN105515216A (en) * | 2014-10-07 | 2016-04-20 | 日立-Lg数据存储韩国公司 | Apparatus and method for transmitting power wirelessly |
| CN105515216B (en) * | 2014-10-07 | 2020-09-11 | 日立-Lg数据存储韩国公司 | Apparatus and method for wireless power transmission |
| CN107005090A (en) * | 2014-12-11 | 2017-08-01 | 皇家飞利浦有限公司 | Wireless induction power is transmitted |
| CN105990887A (en) * | 2015-02-15 | 2016-10-05 | 盛群半导体股份有限公司 | Wireless charging device and wireless charging abnormality detection method |
| CN112564299A (en) * | 2015-03-04 | 2021-03-26 | 苹果公司 | Inductive power transmitter |
| CN112564299B (en) * | 2015-03-04 | 2024-03-05 | 苹果公司 | Inductive power transmitter |
| CN107026516A (en) * | 2016-02-01 | 2017-08-08 | 飞思卡尔半导体公司 | Receiver in wireless charging system removes detection |
| CN107026516B (en) * | 2016-02-01 | 2022-04-05 | 恩智浦美国有限公司 | Receiver removal detection in wireless charging systems |
| CN106972651A (en) * | 2017-05-03 | 2017-07-21 | 南京农业大学 | A kind of electric automobile wireless charging foreign matter detection system |
| US10734832B2 (en) | 2017-07-31 | 2020-08-04 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and terminal for wireless charging |
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| CN108490249A (en) * | 2018-04-18 | 2018-09-04 | 深圳市全智芯科技有限公司 | A kind of detection method of wireless charging receiving terminal aging jig |
| CN108649712A (en) * | 2018-07-17 | 2018-10-12 | 宁波微鹅电子科技有限公司 | Radio energy transmitting terminal, wireless charging system and circuit module |
| CN109103965A (en) * | 2018-10-10 | 2018-12-28 | 上海应用技术大学 | A kind of wireless charger and method |
| US11336118B2 (en) | 2018-12-26 | 2022-05-17 | Nxp Usa, Inc. | Q-factor determination in wireless charging system having complex resonant circuit |
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