CN115276267A - Wireless charging system metal foreign matter identification method based on input current feedback - Google Patents

Wireless charging system metal foreign matter identification method based on input current feedback Download PDF

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Publication number
CN115276267A
CN115276267A CN202210684456.9A CN202210684456A CN115276267A CN 115276267 A CN115276267 A CN 115276267A CN 202210684456 A CN202210684456 A CN 202210684456A CN 115276267 A CN115276267 A CN 115276267A
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wireless charging
charging system
metal foreign
foreign matters
input current
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CN202210684456.9A
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谭林林
李昊泽
武志军
余永丰
黄学良
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Southeast University
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Southeast University
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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
    • 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
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
    • 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a method for identifying metal foreign matters in a wireless charging system based on input current feedback, which comprises the following steps: when the wireless charging system operates, a sensing signal of a primary side input current of the wireless charging system is acquired in real time through a current sensing circuit; collecting a sensing signal corresponding to a primary side input current in a specific phase at a specific frequency; preprocessing the acquired data; inputting the preprocessed data into a preset program to judge foreign matters, if metal foreign matters exist, sending an alarm signal, and if not, continuously identifying whether the metal foreign matters exist. The invention provides the method for identifying the metal foreign matters of the wireless charging system, which has a simple structure and a quick and accurate identification process, is beneficial to ensuring the operation safety of the wireless charging system, does not need external sensors such as temperature, images and radar, and realizes the identification of the metal foreign matters only through the change of the characteristic parameters of the wireless charging system.

Description

Wireless charging system metal foreign matter identification method based on input current feedback
Technical Field
The invention relates to the field of wireless power transmission, in particular to a method for identifying metal foreign matters in a wireless charging system based on input current feedback.
Background
Wireless charging is used as an energy transmission mode without conductor contact, and the application of the wireless charging can effectively improve the charging convenience of electric equipment. For a wireless charging system using a magnetic field for energy exchange, metal foreign matter can change the original characteristics of the system, and reduce energy transfer efficiency and transmission gain. And the metal foreign bodies are identified in time and an alarm is given, so that the system is beneficial to safe and stable operation.
Disclosure of Invention
Aiming at the requirement of the technical field of wireless charging on metal foreign matter identification, the invention provides a method for identifying metal foreign matters of a wireless charging system based on input current feedback, which is beneficial to ensuring the running safety of the wireless charging system.
The purpose of the invention can be realized by the following technical scheme:
the method for identifying the metal foreign matters in the wireless charging system based on the input current feedback comprises the following steps:
the method comprises the following steps: when the wireless charging system operates, a sensing signal of a primary side input current of the wireless charging system is acquired in real time through a current sensing circuit;
step two: collecting a sensing signal corresponding to a primary side input current in a specific phase at a specific frequency;
step three: preprocessing the sampling data;
step four: inputting the preprocessed data into a preset foreign matter distinguishing program.
The resonant topology of the wireless charging system is LCC _ S, the system comprising: inverter S1, primary coil LTSecondary winding LRResonant compensation inductance L1Resonant compensation capacitor C1、CT、CRLoad RLMutual inductance M of primary coil and secondary coil, primary input voltage uABAnd primary side input current iAB；
The resonant frequency of the wireless charging system is omega0，uABIs a square wave voltage uABAt n times omega0The component at frequency is uAB_n，iABAt n times omega0The component at frequency is iAB_nN is a positive integer;
when n is 1, uAB_1Is uABFundamental component of (i)AB_1Is iABThe fundamental component of (a);
the inverter S1 comprises a full-bridge inverter circuit and an inverter master controller, wherein the inverter master controller is used for generating a driving signal of the full-bridge inverter circuit and executing metal foreign matter identification;
the wireless charging system works in a resonance state under a normal condition, and the input impedance angle under the resonance frequency is 0 degree;
the sensing circuit comprises a current sensing chip U1Power supply decoupling capacitor C2，R1And C3A sensing signal output end P1 port of the low-pass filter circuit and the current sensing circuit;
the P1 is connected to an ADC input port of an inverter master control;
the voltage output by the P1 is uiAB，uiABHas a fundamental component of uiAB_1；
U is a unit ofiAB_1And iAB_1With a transmission delay of td_sThe time interval from triggering to actually sampling of the ADC controlled by the inverter is td_ad；
An ADC is triggered by a PWM signal in the main control of the inverter according to a fixed frequency, so that i is acquiredABU corresponding at a particular phaseiAB。
Further: the wireless charging system works in a resonance state under a normal condition, and the input impedance angle under the resonance frequency is 0 degree.
Further: the specific frequency satisfies one of the following conditions:
(1) Equal to the resonant frequency of the wireless charging system;
(2) The resonant frequency of the wireless charging system can be evenly divided.
Further: the bandwidth of the current sensing circuit is higher than the resonant frequency of the wireless charging system.
Further: and in the second step, when the phase is in the specific phase, the component of the primary side input voltage of the wireless charging system under the resonance frequency is 0.
Further: the preprocessing of the sampling data is digital filtering processing.
Further: the foreign matter discrimination program includes the steps of:
the method comprises the following steps: comparing the input numerical value with a preset threshold value;
step two: if the input numerical value exceeds a preset threshold value, determining that metal foreign matters exist, and sending an alarm signal;
step three: if the input numerical value is equal to or less than the preset threshold value, the metal foreign matter is not considered to exist, and the comparison is continuously carried out.
Further: the preset threshold value is set as the maximum value of the preprocessed sampling data when the wireless charging system has no metal foreign matters.
The invention has the beneficial effects that:
the invention provides a method for identifying metal foreign matters in a wireless charging system based on input current feedback. The method is simple in structure, rapid and accurate in identification process, beneficial to guaranteeing safe and stable operation of the wireless charging system, free of the help of external sensors such as temperature, images and radars, and low in cost.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;
fig. 1 is a flowchart of a method for identifying metal foreign objects in a wireless charging system based on input current feedback according to the present invention;
FIG. 2 is a schematic diagram of one embodiment of a wireless charging system of the present invention;
FIG. 3 is a schematic diagram of one embodiment of a current sensing circuit of the present invention;
fig. 4 is a waveform diagram for principle explanation of the wireless charging system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, a method for identifying a metal foreign object in a wireless charging system based on input current feedback is characterized by comprising the following steps:
the method comprises the following steps: when the wireless charging system operates, a sensing signal of a primary side input current of the wireless charging system is acquired in real time through a current sensing circuit;
step two: collecting a sensing signal corresponding to a primary side input current in a specific phase at a specific frequency;
step three: preprocessing the sampling data;
step four: inputting the preprocessed data into a preset foreign matter distinguishing program.
As shown in fig. 2, the resonant topology of the wireless charging system is LCC _ S, and the system includes: inverter S1, primary coil LTSecondary winding LRResonant compensation inductance L1The resonance compensation capacitor C1、CT、CRLoad RLMutual inductance M of primary coil and secondary coil, primary input voltage uABAnd primary side input current iAB。
The resonant frequency of the wireless charging system is omega0，uABIs a square wave voltage uABAt n times omega0The component at frequency is uAB_n，iABAt n times omega0The component at frequency is iAB_nN is a positive integer;
when n is 1, uAB_1Is uABFundamental component of (i)AB_1Is iABThe fundamental component of (a);
the inverter S1 comprises a full-bridge inverter circuit and an inverter master controller, wherein the inverter master controller is used for generating a driving signal of the full-bridge inverter circuit and executing metal foreign matter identification;
the wireless charging system works in a resonance state under a normal condition, and the input impedance angle under the resonance frequency is 0 degree.
As shown in FIG. 3, the sensing circuit includes a current sensing chip U1Power supply decoupling capacitor C2，R1And C3The sensing signal output end P1 port of the low-pass filter circuit and the current sensing circuit.
The P1 is connected to an ADC input port controlled by the inverter;
the voltage output by the P1 is uiAB，uiABHas a fundamental component of uiAB_1；
U is a unit ofiAB_1And iAB_1With a transmission delay of td_sThe time interval from triggering to actually sampling of the ADC controlled by the inverter is td_ad；
An ADC is triggered by a PWM signal at a fixed frequency in the main control of the inverter, so that i is collectedABU corresponding at a particular phaseiAB。
The specific frequency satisfies one of the following conditions:
(1) Equal to the resonant frequency of the wireless charging system;
(2) The resonant frequency of the wireless charging system can be evenly divided.
The bandwidth of the current sensing circuit is higher than the resonant frequency of the wireless charging system.
And in the second step, when the phase is in the specific phase, the component of the primary side input voltage of the wireless charging system under the resonant frequency is 0.
The preprocessing of the sampling data is digital filtering processing.
FIG. 4 shows a schematic diagram of a waveform of the present invention including u for illustrative purposesAB、uAB_1、iAB、 iAB_1、uiAB_1，PWM_adIs an ADC trigger signal, PWM, of the inverter master control_adHas a frequency of ω0T1 is uABCommutation time from negative to positive, T2 the time to trigger the ADC of the inverter master, T3 uABAt a time from positive to negative, T4 is iAB_1From the positive to the negative.
The phase difference between T3 and T1 is pi, and the interval between T4 and T3 is Td_s，
The acquiring the sensing signal corresponding to the primary side input current at a specific phase at a specific frequency comprises the following steps:
triggering an ADC (analog to digital converter) controlled by an inverter at the T2 moment in each period;
ADC samples u at time T4iABThe value of (c).
The interval between T4 and T2 is Td_ad。
The phase difference between T2 and T1 is calculated as follows:
αT1-T2＝π-(td_ad-fd_s)
the preprocessing of the sampling data comprises the following steps: processing the sampled data by using a digital low-pass filter, wherein the discrete expression of the digital filter is as follows:
Figure BDA0003697522500000061
wherein, TcAnd x (k) is the time constant of the low-pass filter, x (k) is the current input value of the low-pass filter, x (k-1) is the input value of the last sampling period of the low-pass filter, y (k) is the current output value of the low-pass filter, and y (k-1) is the output value of the last sampling period of the low-pass filter.
The foreign matter discrimination program includes the steps of:
the method comprises the following steps: comparing the input value with a preset threshold value;
step two: if the input numerical value exceeds a preset threshold value, determining that metal foreign matters exist, and sending an alarm signal;
step three: if the input numerical value is equal to or less than the preset threshold value, the metal foreign matter is considered to be absent, and the comparison is continuously executed.
The preset threshold value is set as the maximum value of the preprocessed sampling data when the wireless charging system has no metal foreign matters.
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 described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims (8)

1. The method for identifying the metal foreign matters in the wireless charging system based on input current feedback is characterized by comprising the following steps of:
the method comprises the following steps: when the wireless charging system operates, a sensing signal of a primary side input current of the wireless charging system is acquired in real time through a current sensing circuit;
step two: collecting a sensing signal corresponding to a primary side input current in a specific phase at a specific frequency;
step three: preprocessing the sampling data;
step four: inputting the preprocessed data into a preset foreign matter distinguishing program;
the resonant topology of the wireless charging system is LCC _ S, the system comprising: inverter S1, primary coil LTSecondary winding LRResonant compensation inductance L1The resonance compensation capacitor C1、CT、CRLoad RLMutual inductance M of primary coil and secondary coil, primary input voltage uABAnd primary side input current iAB；
The resonant frequency of the wireless charging system is omega0，uABIs a square wave voltage uABAt n times omega0The component at frequency is uAB_n，iABAt n times omega0The component at frequency is iAB_nN is a positive integer;
when n is 1, uAB_1Is uABFundamental component of (i)AB_1Is iABThe fundamental component of (a);
the inverter S1 comprises a full-bridge inverter circuit and an inverter master controller, wherein the inverter master controller is used for generating a driving signal of the full-bridge inverter circuit and executing metal foreign matter identification;
the wireless charging system works in a resonance state under a normal condition, and the input impedance angle under the resonance frequency is 0 degree;
the sensing circuit comprises a current sensing chip U1Power supply decoupling capacitor C2，R1And C3A sensing signal output end P1 port of the low-pass filter circuit and the current sensing circuit;
the P1 is connected to an ADC input port controlled by the inverter;
the voltage output by the P1 is uiAB，uiABHas a fundamental component of uiAB_1；
Said u isiAB_1And iAB_1With a transmission delay of td_sThe time interval from triggering to actually sampling of the ADC controlled by the inverter is td_ad；
An ADC is triggered by a PWM signal in the main control of the inverter according to a fixed frequency, so that i is acquiredABU corresponding at a particular phaseiAB。
2. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: the wireless charging system works in a resonance state under a normal condition, and the input impedance angle under the resonance frequency is 0 degree.
3. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: the specific frequency satisfies one of the following conditions:
(1) Equal to the resonant frequency of the wireless charging system;
(2) And the resonant frequency of the wireless charging system can be divided.
4. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: the bandwidth of the current sensing circuit is higher than the resonant frequency of the wireless charging system.
5. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: and in the second step, when the phase is in the specific phase, the component of the primary side input voltage of the wireless charging system under the resonance frequency is 0.
6. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: the preprocessing of the sampling data is digital filtering processing.
7. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback as claimed in claim 1, wherein: the foreign matter discrimination program includes the steps of:
the method comprises the following steps: comparing the input value with a preset threshold value;
step two: if the input numerical value exceeds a preset threshold value, determining that metal foreign matters exist, and sending an alarm signal;
step three: if the input numerical value is equal to or less than the preset threshold value, the metal foreign matter is considered to be absent, and the comparison is continuously executed.
8. The method for identifying the metal foreign matters in the wireless charging system based on the input current feedback of claim 7, wherein: the preset threshold value is set as the maximum value of the preprocessed sampling data when the wireless charging system has no metal foreign matters.
CN202210684456.9A 2022-06-16 2022-06-16 Wireless charging system metal foreign matter identification method based on input current feedback Pending CN115276267A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108494073A (en) * 2018-03-26 2018-09-04 山东大学 A kind of metal foreign matter detecting method and magnet coupled resonant type wireless charging unit
US20210119494A1 (en) * 2018-06-25 2021-04-22 Huawei Technologies Co., Ltd. Apparatus and method for detecting metal foreign matter in wireless charging system, and device
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108494073A (en) * 2018-03-26 2018-09-04 山东大学 A kind of metal foreign matter detecting method and magnet coupled resonant type wireless charging unit
US20210119494A1 (en) * 2018-06-25 2021-04-22 Huawei Technologies Co., Ltd. Apparatus and method for detecting metal foreign matter in wireless charging system, and device
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王跃跃: "基于感应电压的无线充电异物检测***设计", 《中国优秀硕士论文全文数据库》, 15 January 2021 (2021-01-15) *

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