CN113098153A - Foreign matter detection method of LCLP wireless charging system - Google Patents
Foreign matter detection method of LCLP wireless charging system Download PDFInfo
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- CN113098153A CN113098153A CN202110391993.XA CN202110391993A CN113098153A CN 113098153 A CN113098153 A CN 113098153A CN 202110391993 A CN202110391993 A CN 202110391993A CN 113098153 A CN113098153 A CN 113098153A
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000003750 conditioning effect Effects 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000012467 final product Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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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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- 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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a foreign matter detection method of an LCLP wireless charging system. Which includes a loss of real power PLossAnd a power loss threshold value P'LossComparing; when a plurality of consecutive actual power losses PLossExceeds a power loss threshold value P'LossThen, it is determined that there is a foreign object on the interface surface of the transmitting end and the receiving end. The method can effectively eliminate potential safety hazards possibly caused by foreign matters on the surface of the LCLP wireless charging system interface, and the detection result is accurate and reliable.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a foreign matter detection method for an LCLP wireless charging system.
Background
The existing foreign matter detection method for the wireless power transmission system is characterized in that a balance coil is formed by two coils which are connected in a reverse winding mode and is arranged on a transmitting coil plane, ideally, when no metal foreign matter exists on the coil plane, the end voltage of the balance coil should be 0, the end voltage of the balance coil is detected, rectification filtering sampling is carried out, and whether the metal foreign matter exists or not is judged by comparing a sampling value with a threshold value.
Because the coil structure of the method is simple, the compensation topology is SS compensation, and the terminal voltage of the balance coil is changed when the load is changed or the transmitting end and the receiving end of the wireless charging system deviate, the detection effect of the method in practical application is not ideal.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a foreign object detection method for an LCLP wireless charging system, which can detect whether a foreign object exists on a wireless charging device.
The purpose of the invention can be realized by the following technical scheme: a foreign matter detection method of an LCLP wireless charging system comprises a transmitting end circuit and a receiving end circuit, wherein the transmitting end circuit comprises a power supply voltage VdcFirst inductor L, primary side resonant capacitor C1And a transmitting coil L1The receiving end circuit comprises a receiving coil L2Secondary side resonance capacitor C2And a load RL(ii) a The transmitting end of the LCLP wireless charging system has calibrated loss power PPTLossThe receiving end has calibrated loss power PPRLossWith calibrated power loss threshold P 'for the system'LossThe method comprises the following steps:
obtaining a primary resonant capacitor C of a transmitting end1Voltage V acrossC1And a transmitting coil current I1Calculating the input power P of the transmitting endinAccording to the input power PinAnd power loss PPTLossCalculating the actual transmitting power P of the transmitting endPT(ii) a Obtaining receiving end load RLOutput voltage V at both endsoAnd an output current IoTo find the output power P of the receiving endoutAccording to the output power PoutAnd power loss PPTLossCalculating the actual received power P of the receiving endPR(ii) a Will actually transmit power PPTAnd the actual received power PPRCalculating the actual power loss P by differenceLoss(ii) a Will lose the actual power by PLossAnd a power loss threshold value P'LossComparing; repeating the above steps for multiple times to obtain multiple comparison results, and arranging the comparison results into a sequence with multiple comparison resultsA continuous actual power loss PLossExceeds a power loss threshold value P'LossThen, it is determined that there is a foreign object on the interface surface of the transmitting end and the receiving end.
In the above method for detecting a foreign object in an LCLP wireless charging system, the actual transmission power P isPTBy applying an input power PinAnd power loss PPTLossAnd (4) obtaining a difference.
In the above method for detecting a foreign object in an LCLP wireless charging system, the actual received power P isPRBy applying an output power PoutAnd power loss PPRLossAnd (6) summing to obtain the final product.
In the above foreign object detection method for the LCLP wireless charging system, the system further includes a primary side conditioning circuit and a secondary side conditioning circuit.
In the foreign matter detection method for the LCLP wireless charging system, the primary side conditioning circuit and the secondary side conditioning circuit are both inverter circuits.
Compared with the prior art, the foreign matter detection method of the LCLP wireless charging system has the following advantages: by the method, whether foreign matters exist on the interface surfaces of the transmitting end and the receiving end of the LCLP wireless charging system can be detected in real time, so that potential safety hazards caused by the existence of the foreign matters are eliminated, and the detection result is accurate and reliable.
Drawings
Fig. 1 is a schematic circuit diagram of the topology of the LCLP wireless charging system of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the topology circuit of the LCLP wireless charging system includes a transmitting-end circuit including a power supply voltage V and a receiving-end circuitdcPrimary side conditioning circuit, first inductor L and primary side resonant capacitor C1And a transmitting coil L1The receiving end circuit comprises a receiving coil L2Secondary side resonance capacitor C2Secondary side conditioning circuit and load RL(ii) a The transmitting end has calibrated loss workRate PPTLossThe receiving end has calibrated loss power PPRLoss. In this embodiment, the primary side conditioning circuit and the secondary side conditioning circuit are both inverter circuits.
The topological circuit of the LCLP wireless charging system has quasi-constant voltage characteristic, and the output voltage V of the topological circuitoIs nearly constant and the transmit coil current is minimally affected by mutual inductance.
Firstly, the induced electromotive force V of the receiving end is calculatedocAnd receiving end equivalent impedance Z2Comprises the following steps:
Voc＝jωMI1 (1)
in the above formula, RacFor load equivalent AC impedance, M is a transmitting coil L1And a receiving coil L2Mutual inductance, I1Is the transmit coil current.
Receiving end short-circuit current ISCComprises the following steps:
quality factor Q of receiving end2And an AC equivalent resistance RacComprises the following steps:
receiving end coil current I2Comprises the following steps:
induced voltage V of transmitting terminalrComprises the following steps:
Vr＝-jωML2 (7)
in order to improve the power transmission capability of the system, the system should operate at the secondary natural resonant frequency, i.e., ω L1C1When the impedance is equal to 1, the equivalent impedance Z of the transmitting end is obtained by simplification1Comprises the following steps:
in the formula ZrIs the equivalent impedance reflected from the secondary to the primary.
Output current I of conditioning circuitinComprises the following steps:
transmitting coil current I1Comprises the following steps:
according to the load RLThe voltage formula is output at two ends, and the load R can be obtainedLOutput voltage V at both endsoAnd an output current IoComprises the following steps:
transmitting terminal primary side resonance capacitor C1Voltage V acrossC1Comprises the following steps:
simplified to obtain the transmitting coil L1And a receiving coil L2The mutual inductance M is:
load RLThe values are:
in the above formula, θ is VC1、I1The phase angle difference between them.
Load RLOutput current I at both endsoComprises the following steps:
through the process, the primary side resonance capacitor C of the transmitting end is known1Voltage V acrossC1And a transmitting coil current I1Receiving end load RLOutput voltage V at both endsoAnd an output current Io。
Passing voltage VC1And a transmitting coil current I1Determining the input power P of the transmitting endinThen inputting the power PinAnd power loss PPTLossObtaining the actual transmitting power P of the transmitting terminal by making a differencePT；
By receiving the end load RLOutput voltage V at both endsoAnd an output current IoCalculating the output power P of the receiving endoutWill output power PoutAnd power loss PPRLossSumming to obtain the actual receiving power P of the receiving endPR；
Then the actual transmission power PPTAnd the actual received power PPRCalculating the actual power loss P by differenceLoss(ii) a Will lose the actual power by PLossAnd a power loss threshold value P'LossComparing; the above-mentioned processes are repeatedly implemented several times, and the obtained several comparison results are formed intoSequence when a plurality of successive real power losses P in the sequenceLossSuper power loss threshold value P'LossThen, it is determined that there is a foreign object on the interface surface of the transmitting end and the receiving end.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A foreign matter detection method for LCLP wireless charging system includes the step of reducing the actual power consumption PLossAnd a power loss threshold value P'LossComparing; repeating the above steps for multiple times to obtain multiple comparison results, and arranging the comparison results into a sequence when multiple continuous actual power losses P in the sequenceLossExceeds a power loss threshold value P'LossThen, it is determined that there is a foreign object on the interface surface of the transmitting end and the receiving end.
2. The foreign object detection method of the LCLP wireless charging system of claim 1, wherein the system comprises a transmitting side circuit and a receiving side circuit, the transmitting side circuit comprising a power supply voltage VdcA first conditioning circuit, a first inductor L and a primary side resonance capacitor C1And a transmitting coil L1The receiving end circuit comprises a receiving coil L2Secondary side resonance capacitor C2Second conditioning circuit and load RL(ii) a The transmitting end of the LCLP wireless charging system has calibrated loss power PPTLossThe receiving end has calibrated loss power PPRLossWith calibrated power loss threshold P 'for the system'Loss。
3. The foreign object detection method of the LCLP wireless charging system of claim 2The method is characterized by also comprising the following steps: obtaining a primary resonant capacitor C of a transmitting end1Voltage V acrossC1And a transmitting coil current I1Calculating the input power P of the transmitting endinAccording to the input power PinAnd power loss PPTLossCalculating the actual transmitting power P of the transmitting endPT(ii) a Obtaining receiving end load RLOutput voltage V at both endsoAnd an output current IoTo find the output power P of the receiving endoutAccording to the output power PoutAnd power loss PPTLossCalculating the actual received power P of the receiving endPR(ii) a Will actually transmit power PPTAnd the actual received power PPRCalculating the actual power loss P by differenceLoss；。
4. The foreign object detection method of the LCLP wireless charging system of claim 3, wherein the actual transmission power PPTBy applying an input power PinAnd power loss PPTLossAnd (4) obtaining a difference.
5. The foreign object detection method of the LCLP wireless charging system of claim 3, wherein the actual received power PPRBy applying an output power PoutAnd power loss PPRLossAnd (6) summing to obtain the final product.
6. The method for foreign object detection for an LCLP wireless charging system, according to claim 2, further comprising a primary side conditioning circuit and a secondary side conditioning circuit.
7. The foreign object detection method for the LCLP wireless charging system of claim 6, wherein the primary side conditioning circuit and the secondary side conditioning circuit are both inverter circuits.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109004771A (en) * | 2018-07-27 | 2018-12-14 | 浙江泰米电子科技有限公司 | A kind of wireless charger and foreign matter detecting method |
| CN109143386A (en) * | 2018-04-27 | 2019-01-04 | 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 |
| EP3451491A1 (en) * | 2017-08-30 | 2019-03-06 | NXP USA, Inc. | Methods and systems for foreign objection detection in wireless energy transfer systems |
| WO2019139326A1 (en) * | 2018-01-10 | 2019-07-18 | 엘지전자 주식회사 | Apparatus and method for performing power calibration in wireless power transmission system |
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- 2021-04-13 CN CN202110391993.XA patent/CN113098153A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP3451491A1 (en) * | 2017-08-30 | 2019-03-06 | NXP USA, Inc. | Methods and systems for foreign objection detection in wireless energy transfer systems |
| WO2019139326A1 (en) * | 2018-01-10 | 2019-07-18 | 엘지전자 주식회사 | Apparatus and method for performing power calibration in wireless power transmission system |
| CN109143386A (en) * | 2018-04-27 | 2019-01-04 | 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 |
| CN109004771A (en) * | 2018-07-27 | 2018-12-14 | 浙江泰米电子科技有限公司 | A kind of wireless charger and foreign matter detecting method |
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Application publication date: 20210709 |