CN112803617A - Foreign matter detection method and device applied to wireless charging - Google Patents
Foreign matter detection method and device applied to wireless charging Download PDFInfo
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- CN112803617A CN112803617A CN201911112323.9A CN201911112323A CN112803617A CN 112803617 A CN112803617 A CN 112803617A CN 201911112323 A CN201911112323 A CN 201911112323A CN 112803617 A CN112803617 A CN 112803617A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 20
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- 229910052751 metal Inorganic materials 0.000 abstract description 9
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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Abstract
A foreign matter detection method and device applied to wireless charging follow V1.2.4 version Qi protocol, and detect whether there is a metal foreign matter such as a coin, a pin, an aluminum foil, etc. by calculating the loss percentage of a received power packet and a transmission power and comparing with a threshold value. Meanwhile, the threshold value can be adjusted in real time on the basis of the reference threshold value according to the size of the sending power and the coil coupling degree during charging, so that the detection accuracy is further improved.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to foreign matter detection in wireless charging.
Background
At present, wireless charging is widely applied, and the safety in the charging process is more and more concerned by people. Most of the wireless charging techniques currently in commercial use are based on the principle of electromagnetic coupling, i.e. once the receiver coil is close to the transmitter coil, a current is generated in the receiver coil by electromagnetic induction. In practical products, if a metal object is accidentally placed on the transmitting coil, once charging is started, the metal may be heated by electromagnetic waves, and if the presence of the metal object cannot be timely detected, the temperature of the metal may rise to a level sufficient to scald human skin, and even a fire risk may occur.
Conventionally, detection of metallic foreign matter is generally performed by using a temperature sensor, a Q value of a detection coil, or a method of calculating a loss of energy or the like. The limitation of using a temperature sensor is that the probe cannot directly contact the surface of the mold, and a large error occurs; the Q value detection of the coil needs an additional circuit, and the precision is greatly influenced by the position of the receiver; the energy loss calculation refers to that the receiver returns the received power to the charger, the charger subtracts the power received by the receiver from the power transmitted by the receiver, and if the difference between the two is large, the receiver indicates that other objects nearby absorb electromagnetic waves, so that the energy loss calculation is easy to implement and accurate. The mainstream way in the 5W scheme is to add an extended Foreign Object Detection function FOD Extension (Foreign Object Detection Extension) in the basic Power version BPP (less than or equal to 5W) (base Power Profile). As shown in fig. 1, the FOD extension includes a synchronization Phase (synchronization Phase) and a Calibration Phase (Calibration Phase), both of which require to support two-way communication, however, the wireless charging consortium WPC promulgates the latest V1.2.4 Qi protocol in 3 months of 2018, which requires that two-way communication cannot be added to the BPP, that is, the BPP charger cannot realize the synchronization Phase and the Calibration Phase, that is, cannot detect the energy loss by using the FOD extension. Therefore, a new method is needed to calculate the energy loss to further achieve foreign object detection.
Disclosure of Invention
The invention provides a foreign matter detection method and device applied to wireless charging, which can finally realize the detection of metal foreign matters by directly calculating power loss.
A foreign object detection method applied to wireless charging comprises the following steps:
obtaining received power PrAfter entering a stable charging stage, the receiver sends a receiving power packet to the transmitter at an interval of 1.5 s;
calculating the transmission power PtAfter entering a stable charging stage, the emitter samples the power supply voltage and current at intervals of 1.5s and calculates the emission power;
calculating the difference P between the transmitting power and the receiving powerl＝Pt-Pr(ii) a And
according to PlIt is judged whether or not foreign matter is present.
Further, said is according to PlDetermining whether foreign matter is present includes:
calculating percent power loss R ═ Pl/Pt)*100％；
Comparing the power loss percentage with a preset threshold value;
if the power loss percentage is larger than the threshold value, counting for one time; and
when the count is greater than the set value, it indicates that a foreign object is detected.
Further, the threshold is obtained by debugging according to the selected coil and the selected die.
Further, the threshold value can be adjusted according to the sending power of the transmitter and the coil coupling degree of the transmitter and the receiver in the charging process, so that the detection sensitivity is adjusted.
In another aspect, the present invention provides a foreign object detection apparatus applied to wireless charging, including:
a received power obtaining module for obtaining a received power packet;
the sampling module is used for sampling the power supply voltage and current of the emitter;
the calculation module is used for calculating the difference value of the transmitting power, the transmitting power and the receiving power and the power loss percentage; and
and the judging module is used for judging whether foreign matters exist according to the output of the calculating module.
The detection method and the device provided by the invention can be applied to a BPP specification wireless charger, do not need two-way communication, and meet the requirements of V1.2.4 Qi protocols. The method provided by the invention adopts the power percentage as the threshold value, is easy to realize, and meanwhile, the threshold value can be adjusted in real time according to the sending power during charging and the coil coupling degree, so that the detection accuracy is further improved.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.
FIG. 1 shows a schematic flow diagram of an extended foreign object detection function in the prior art;
fig. 2 is a flow chart illustrating a foreign object detection method applied to wireless charging according to an embodiment of the present invention;
fig. 3a and 3b are schematic diagrams illustrating communication timing of a BPP-compliant wireless charger during a charging phase; and
fig. 4 shows a schematic diagram of a foreign object detection apparatus applied to wireless charging according to an embodiment of the present invention.
Detailed Description
In the following description, the invention is described with reference to various embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of embodiments of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention may be practiced without specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
It should be noted that, in the embodiments of the present invention, the process steps are described in a specific order, however, this is only for convenience of distinguishing the steps, and the order of the steps is not limited, and in different embodiments of the present invention, the order of the steps may be adjusted according to the adjustment of the process.
The invention provides a foreign matter detection method applied to wireless charging, which follows V1.2.4 version Qi protocol, does not need to carry out bidirectional communication, and directly calculates power loss, thereby realizing the detection of metal foreign matters.
As shown in fig. 3a and 3b, a device designed and produced according to the WPC protocol and its requirements is placed on a charger, and after entering a charging phase, a receiver in the device sends a control error packet and a received power packet at a certain time interval, where the control error packet is used to control the magnitude of the sent power, and if the control error is zero, it means that the power does not need to be adjusted, and enters a stable charging state, and if the control error is negative, it indicates that the charging current needs to be reduced, otherwise, it indicates that the charging current needs to be increased. After sending a control error packet tdelay+tcontrolAfter a time, the current starts to be regulated, and tdelay+tcontrolThe transmitter in the charger does not send any data packets during the time period during which foreign object detection may be performed.
As shown in fig. 2, a foreign object detection method applied to wireless charging includes:
step 201, obtaining received power Pr. After entering the stable charging phase, the receiver follows the time interval t defined by the Qi protocolreceivedAnd transmitting the reception power packet. In one embodiment of the present invention, after entering the steady charging phase, the receiver sends a received power packet to the transmitter every 1.5s, and the transmitter obtains the received power.
Step 202, calculating the transmission power Pt. The transmitter samples power supply voltage and current according to the same interval as the sending time interval of the received power packet, and calculates the transmitting power;
step 203, calculating the power loss Pl,Pl＝Pt-Pr；
According to power loss PlCan judge whether or notA foreign object. In particular, according to the power loss PlDetermining whether foreign objects are present may include one or more of steps 204, 205, and 206, below.
Step 204, calculating the power loss percentage R, R ═ Pl/Pt)*100％；
Only one comparison result may not accurately determine whether there is a metal foreign object, so that multiple comparisons need to be performed simultaneously to determine whether there is a foreign object, and therefore, in step 205, the power loss percentage and the threshold are compared, and if the power loss percentage is greater than the threshold, a count is performed;
step 206, comparing the count value with the set value, and if the count value is greater than the set value, indicating that a foreign object exists. Otherwise, indicating no foreign matter, returning to step 201.
After step 204 is completed, step 210, threshold adjustment, is performed before the determination is made. The initial threshold value is determined when the transmitter leaves a factory, and specifically, is calculated by using a debugging program according to a mold and a transmitting coil adopted by the transmitter. In the charging process, the transmitter adjusts the threshold value according to the sending power and the coil coupling degree of the transmitter and the receiver. In one embodiment of the present invention, the threshold adjustment is specifically as follows:
when the transmission power is lower than the set value 1, the threshold value is increased by C1%;
when the transmission power is higher than the set value 2, the threshold value is reduced by C2%;
when the coil coupling degree is lower than a set value 3, increasing the threshold value by C3%; and
when the coil coupling is higher than the set value of 4, the threshold is decreased by C4%.
The set value 1, the set value 2, the set value 3, the set value 4, the C1, the C2, the C3 and the C4 are determined through tests before the transmitter leaves a factory.
Fig. 4 shows a schematic diagram of a foreign object detection apparatus applied to wireless charging according to an embodiment of the present invention. As shown in fig. 4, a foreign matter detection apparatus applied to wireless charging includes:
a received power obtaining module 401, configured to obtain a received power packet;
a sampling module 402 for sampling the power supply voltage and current of the transmitter;
a calculating module 403, configured to calculate a transmitting power, a difference between the transmitting power and the receiving power, and a power loss percentage; and
and a judging module 404, configured to judge whether a foreign object exists according to the output of the calculating module. The detection method and the device provided by the invention are applied to a BPP specification wireless charger, can accurately detect metal foreign matters such as coins, pins, aluminum foils and the like in the charging process, and successfully stop charging under the condition that the temperature (60 ℃) required by a Qi protocol is not exceeded. Furthermore, the system sensitivity can be adjusted by adjusting the threshold.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (10)
1. A foreign object detection method applied to wireless charging comprises the following steps:
obtaining received power Pr；
Calculating the transmitting power P of the transmittert；
Calculating the difference P between the transmitting power and the receiving powerl＝Pt-Pr(ii) a And
according to the difference PlIt is judged whether or not foreign matter is present.
2. Method according to claim 1, characterized in that the difference P is used as a function oflDetermining whether foreign matter is present includes:
calculating percent power loss R ═ Pl/Pt)*100％；
Comparing the power loss percentage with a preset threshold value;
if the power percentage is larger than the threshold value, counting for one time; and
when the count is greater than the set value, it indicates that a foreign object is detected.
3. The method of claim 2, wherein when the count is less than the set value, returning to the step of obtaining the received power Pr。
4. The method of claim 1, wherein the transmitter samples the power voltage and current at 1.5s intervals after entering the stable charging phase and calculates the transmission power Pt。
5. The method of claim 1, wherein the receiver sends the received power packets to the transmitter at 1.5s intervals after entering the stable charging phase.
6. The method of claim 2, wherein the threshold is adjusted based on a coil and a die selected by the transmitter.
7. The method of claim 2, further comprising adjustment of a threshold.
8. The method of claim 7, wherein the adjusting of the threshold is configured to adjust the threshold during a charging phase according to a transmission power of a transmitter and a coil coupling degree of the transmitter and a receiver, and comprises:
when the transmission power is lower than the set value 1, the threshold value is increased by C1%;
when the transmission power is higher than the set value 2, the threshold value is reduced by C2%;
when the coil coupling degree is lower than a set value 3, increasing the threshold value by C3%; and
when the coil coupling is higher than the set value of 4, the threshold is decreased by C4%.
9. The method of claim 8, wherein the values of the set point 1, the set point 2, the set point 3, the set point 4, C1, C2, C3, and C4 are determined by testing before the transmitter leaves a factory.
10. A foreign object detection apparatus for wireless charging using the method according to any one of claims 1 to 9, comprising: a received power obtaining module for obtaining a received power packet;
the sampling module is used for sampling the power supply voltage and current of the emitter;
the calculation module is used for calculating the difference value of the transmitting power, the transmitting power and the receiving power and the power loss percentage; and
and the judging module is used for judging whether foreign matters exist according to the output of the calculating module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023137979A1 (en) * | 2022-01-24 | 2023-07-27 | 佛山市顺德区美的电子科技有限公司 | Foreign object detection method and apparatus, household appliance and air conditioning system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103852631A (en) * | 2014-01-11 | 2014-06-11 | 深圳市普林泰克科技有限公司 | Algorithm for indirectly detecting metal foreign bodies for wireless charger |
| CN105334539A (en) * | 2014-06-30 | 2016-02-17 | 无锡华润矽科微电子有限公司 | Method for realizing foreign body detection in wireless charging |
| CN105474507A (en) * | 2013-08-23 | 2016-04-06 | 高通股份有限公司 | Apparatus and method for non-compliant object detection |
| CN106100155A (en) * | 2012-06-22 | 2016-11-09 | 索尼公司 | Detection equipment, detecting system and the method for transmission electric power |
| CN107112814A (en) * | 2014-12-30 | 2017-08-29 | 高通股份有限公司 | System, method and apparatus for detecting foreign body |
| 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 |
| 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 |
| CN110168860A (en) * | 2016-12-06 | 2019-08-23 | Lg伊诺特有限公司 | Method and apparatus for detecting foreign matter |
-
2019
- 2019-11-14 CN CN201911112323.9A patent/CN112803617A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106100155A (en) * | 2012-06-22 | 2016-11-09 | 索尼公司 | Detection equipment, detecting system and the method for transmission electric power |
| CN105474507A (en) * | 2013-08-23 | 2016-04-06 | 高通股份有限公司 | Apparatus and method for non-compliant object detection |
| CN105474508A (en) * | 2013-08-23 | 2016-04-06 | 高通股份有限公司 | Apparatus and method for lost power detection |
| CN103852631A (en) * | 2014-01-11 | 2014-06-11 | 深圳市普林泰克科技有限公司 | Algorithm for indirectly detecting metal foreign bodies for wireless charger |
| CN105334539A (en) * | 2014-06-30 | 2016-02-17 | 无锡华润矽科微电子有限公司 | Method for realizing foreign body detection in wireless charging |
| CN107112814A (en) * | 2014-12-30 | 2017-08-29 | 高通股份有限公司 | System, method and apparatus for detecting foreign body |
| CN110168860A (en) * | 2016-12-06 | 2019-08-23 | Lg伊诺特有限公司 | Method and apparatus for detecting foreign matter |
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023137979A1 (en) * | 2022-01-24 | 2023-07-27 | 佛山市顺德区美的电子科技有限公司 | Foreign object detection method and apparatus, household appliance and air conditioning system |
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