CN110146760A - Detect the method and system of the wireless charging degree of coupling - Google Patents
Detect the method and system of the wireless charging degree of coupling Download PDFInfo
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- CN110146760A CN110146760A CN201910460873.3A CN201910460873A CN110146760A CN 110146760 A CN110146760 A CN 110146760A CN 201910460873 A CN201910460873 A CN 201910460873A CN 110146760 A CN110146760 A CN 110146760A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of methods for detecting the wireless charging degree of coupling, radio energy transmission system is sequentially connected in series by power supply, voltage regulating module, inverter module, resonance modules, rectification module, turn-off module, load, and described method includes following steps: enabling the load cut-off of receiving end；Transmitting terminal generates the alternating current of a high frequency, and emits a high frequency magnetic field on transmitting end-coil, and the frequency of high frequency magnetic field is twice or more of system resonance frequencies；It receives end-coil to receive high frequency magnetic field and generate an alternating current, alternating current generates a DC voltage, DC voltage described in real-time detection by rectification and filtering；And the DC voltage that will test is converted to the degree of coupling.The present invention also provides a kind of systems for detecting the wireless charging degree of coupling.Method and system provided by the invention overcomes the deficiencies in the prior art, can conveniently and automatically carry out the detection of the wireless charging system degree of coupling, and testing result is accurate, reliable.
Description
Technical field
The present invention relates to wireless charging parameter detecting technical fields, in particular to a kind of to pass through load cut-off and high-frequency electromagnetic
The method of the wave detection wireless charging degree of coupling.
Background technique
Wireless power transmission (WPT) technology has had mature application, including mobile phone, automobile etc. in many fields, simultaneously
It is also more and more in the research of the emerging fields such as unmanned plane, medical electronics, robot.For WPT, the degree of coupling is to influence system
One of the core parameter for characteristic of uniting, the parameters such as efficiency, output power of system and the system degree of coupling, which have, directly to be contacted.Much it is being
In system, degree of coupling detection is very crucial step, is related to the control method, system performance and control strategy of system.
Application No. is " 201510955360.1 ", entitled " wireless charging system and its degree of coupling compensation devices and method "
Patent disclose a set of wireless charging system that system effectiveness is improved by degree of coupling compensation method, however the patent is not
The method for specifically describing the detection of its degree of coupling, while degree of coupling detection is again the very crucial step of this method.For the degree of coupling
For, it is to be determined by the relative position of WPT coil, so its value is difficult easily to detected, coil is coupled
For degree detection, the method for standard is to tap into capable detection by artificially just reversed to coil progress, although this method is accurate,
It cannot detect automatically, while operating process is comparatively laborious.
It is a kind of " original for electromagnetic coupling wireless charging device application No. is " 201510789000.9 ", patent name
Secondary side alignment detection control method " is a kind of method for detecting the WPT degree of coupling, and this method is that transmitting frequency is determined by leakage inductance
Rate determines the system degree of coupling by detection circuit gain.For WPT, the equivalent leakage inductance of system is can be with distance
It is different and change, validity in this way be not it is very high, simultaneity factor needs just obtain ginseng by simulation calculation
Number, method are overall excessively cumbersome.
Summary of the invention
The technical problem to be solved by the present invention is to how easily and accurately carry out the detection of the wireless charging system degree of coupling.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide a kind of sides for detecting the wireless charging degree of coupling
Method, radio energy transmission system by power supply, voltage regulating module, inverter module, resonance modules, rectification module, turn-off module, load according to
It is secondary to be composed in series, the power supply, the voltage regulating module, the inverter module and the resonance modules primary side constitute transmitting terminal,
Secondary side, the rectification module, the turn-off module and the load of the resonance modules constitute receiving end, which is characterized in that
Described method includes following steps:
Step 1: enabling the load cut-off of the receiving end；
Step 2: the transmitting terminal generates the alternating current of a high frequency, and emits a high frequency magnetic on transmitting end-coil
, the frequency of the high frequency magnetic field is twice or more of the radio energy transmission system resonance frequency；
Step 3: the reception end-coil receives the high frequency magnetic field and generates an alternating current, and the alternating current passes through
Rectification generates a DC voltage, DC voltage described in real-time detection with filtering；
Step 4: the DC voltage and the degree of coupling will test for linear corresponding relation according to the linear corresponding relation
To the DC voltage be converted to the degree of coupling.
Preferably, in the step 1, tripping action is implemented by the turn-off module.
Preferably, in the step 2, the transmitting terminal generates the alternating current of a high frequency by the inverter module.
Preferably, in the step 4, pass through conversion formulaThe direct current that will test
Pressure is converted to the degree of coupling；Wherein, U is the DC voltage, i.e., the output voltage of the described rectification module；K is the degree of coupling, UINFor institute
State the input voltage of rectification module, LPFor the inductance of the primary side of the resonance modules, LSFor the electricity on the secondary side of the resonance modules
Sensibility reciprocal.
Preferably, in the step 4, the mode for first passing through test in advance obtains the linear right of the DC voltage and the degree of coupling
It should be related to, be converted to the degree of coupling further according to the DC voltage that the linear corresponding relation will test.
The present invention also provides a kind of systems for detecting the wireless charging degree of coupling, and radio energy transmission system is by power supply, tune
Die block, inverter module, resonance modules, rectification module, turn-off module, load are sequentially connected in series, it is characterised in that: described humorous
The primary side for module of shaking connects the first signal pickup assembly, and first signal pickup assembly connects the first control module, and described the
One control module connects the voltage regulating module and the inverter module；The secondary side connection second signal acquisition dress of the resonance modules
It sets, the second signal acquisition device connects the second control module, and second control module connects the turn-off module.
Preferably, the turn-off module is switching tube or relay.
Preferably, the load is battery, and the turn-off module is diode.
Preferably, first signal pickup assembly connects the first micro-control unit, the first micro-control unit connection
First control module；The second signal acquisition device connects the second micro-control unit, and second micro-control unit connects
Connect second control module.
It is highly preferred that first micro-control unit connects the first communication module, the second micro-control unit connection the
Two communication modules, first communication module connect second communication module.
The present invention provides a kind of method for detecting the wireless charging degree of coupling by load cut-off and frequency electromagnetic waves, the party
Method is to enable receiving terminal system break load, while emitting end system and sending a frequency electromagnetic waves, the high-frequency electromagnetic wave frequency first
Rate is twice or more of system resonance frequencies, which can generate a voltage on the output circuit of receiving end, is received
End system judges the system degree of coupling by detecting the output voltage.
Method and system provided by the invention overcomes the deficiencies in the prior art, can conveniently and automatically carry out wireless charging
The detection of the electric system degree of coupling, and testing result is accurate, reliable.
Detailed description of the invention
The present invention is illustrated by way of example in attached drawing, is not intended to limit the present invention.Similar appended drawing reference refers to similar element.
Fig. 1 is the schematic block diagram of wireless power transmission WPT preferred circuit detection system；
Fig. 2 is the overall flow figure of wireless power transmission WPT preferred circuit detection system；
Fig. 3 is the method provided in this embodiment for detecting the wireless charging degree of coupling by load cut-off and frequency electromagnetic waves
Flow chart；
Fig. 4 is rectification module output voltage and degree of coupling corresponding diagram.
Specific embodiment
With reference to detailed figure set forth herein and description, the disclosure can be best understood.
Fig. 1 is the schematic block diagram of wireless power transmission WPT preferred circuit detection system, and circuit thereon can be according to specific need
It asks and is changed, but core circuit design thinking is constant.
The input of whole system is defined as DC source, then need to add rectification module in input terminal if alternating current source input.
Wireless power transmission WPT preferred circuit is by DC source, voltage regulating module 1, inverter module 2, resonance modules 3, rectification module 4, open circuit
Module 5, load are sequentially connected in series.Power supply, voltage regulating module 1, inverter module 2 and resonance modules 3 primary side constitute transmitting terminal, it is humorous
Secondary side, rectification module 4, turn-off module 5 and the load for module 3 of shaking constitute receiving end.
The primary side of resonance modules 3 connects the first signal pickup assembly, and the first signal pickup assembly connects the first MCU (micro-control
Unit processed), the first the first control module of MCU connection and the first communication module, the first control module connect voltage regulating module 1 and inversion
Module 2；The secondary side of resonance modules 3 connects second signal acquisition device, and second signal acquisition device connects the 2nd MCU, the 2nd MCU
The second control module and the second communication module are connected, the second control module connects turn-off module 5；First communication module connection second
Communication module.
Wherein, voltage regulating module 1 is buck-boost (lifting/voltage reducing converter) topology, and function is to be changed by control circuit
Become input dc power and be depressed into required voltage, which can add according to design requirement, deletes or change.
The function of inverter module 2 is that a high-frequency alternating current is provided for resonance modules 3, frequency with demand for control difference
It can change, circuit topology can also be there are many form, which is one of the basic module of WPT, can be according to setting
Meter demand changes topology, but unsuppressible-suppression.
Resonance modules 3 are to amplify alternating current by LC resonance circuit to be wirelessly transferred energy by coil, the module
There are many topology compositions, including SS (series connection-tandem type), SP (serial-parallel type), PP (parallel connection-parallel connection type), PS (parallel connection-string
Connection type), LCC (series parallel resonance type), LCL (load resonant type) etc., the resonance modules module most crucial as WPT is different
Topology has different system performances, and wherein SS topology is the topology being most widely used in the market, while application of the invention
Field also may be only available for SS topology.
The function of rectification module 4 is direct current needed for the alternating current that resonance modules 3 are exported is converted to rear end, equally should
Module is one of basic module of WPT, unsuppressible-suppression, but its topology composition can there are many, topology that the present invention uses for
Diode full-bridge rectification topology.
The function of turn-off module 5 is to enable load cut-off, and the purpose of the module is so that the output end of rectification module 4 is equivalent to
High-impedance state, there are many constructions of the module, can implement tripping action by switching tube or relay.For traditional WPT
For, turn-off module 5 is optional module, can be added, deleted or changed according to design requirement.And for the present embodiment system and
Speech, turn-off module 5 are one of indispensable module, are to complete one of degree of coupling detection household function.
Signal pickup assembly mainly acquires the electrical parameter of resonance modules 3 Yu rectification module 5, the acquisition of 3 parameter of resonance modules
Multiple functions, including foreign bodies detection, control feedback, communications feedback etc. can be provided for WPT, they are one of the optional function of WPT, and it can
It is added or deleted according to design.The output voltage of rectification module 5 is detected as one of the step of degree of coupling of the present invention detection, no
It can delete.
In conjunction with Fig. 2, the overall workflow of above-mentioned wireless power transmission WPT preferred circuit detection system is as follows:
One, system electrification self-test: after system starting, start the ego state detection for carrying out some column, including load inspection
Survey, communication check, functions of modules detection etc., the self-test process is by can just enter downstream later, and otherwise system will root
It reports an error according to testing result.
Two, the degree of coupling detects: System self-test normally enters the degree of coupling afterwards and detects, which is to enable receiving terminal system disconnected first
Road load, while emitting end system and sending a frequency electromagnetic waves, frequency is twice or more of system resonance frequencies, the high frequency
Electromagnetic wave can generate a voltage on the output circuit of receiving end, and receiving terminal system judges system by detecting the output voltage
The degree of coupling.
Three, wireless charging: after system obtains circuit parameter and degree of coupling coefficient, can carry out wireless power transmission,
It can implement control according to circuit parameter and the degree of coupling, and control method has voltage control, frequency control, phase controlling, duty
More a variety of than control etc., simultaneity factor can change in real time control parameter according to real-time parameter.
Four, terminate charging: when system, which meets, terminates charge condition, system stops wireless power transmission, and cuts off negative
It carries, waits system charging instruction next time.
In conjunction with Fig. 3, the side provided in this embodiment that the wireless charging degree of coupling is detected by load cut-off and frequency electromagnetic waves
Method includes the following steps:
Step 1: enabling the load cut-off of receiving end, the purpose of the step is so that the output end of rectification module 4 is equivalent to height
Resistance state, there are many implementation methods of the step, can implement tripping action by switching tube or relay, if load is electricity
Pond, can also be isolated load by the way of diode, other can make depending on situation.
Step 2: transmitting terminal generates the alternating current of a high frequency by inverter, and emits a height on transmitting end-coil
Frequency magnetic field, the frequency in the magnetic field need to be twice or more of system resonance frequencies, specific frequency can according to circuit state and
Required parameter voltages are determined.
Step 3: receiving end-coil and receive the high frequency magnetic field and generate an alternating current, which passes through rectification and filter
Wave can generate a DC voltage, the system real-time detection of the receiving end DC voltage.
Step 4: by the DC voltage detected, system can be converted to the DC voltage degree of coupling, specific voltage
There are many ways to converting the degree of coupling, can pass through conversion formulaObtain DC voltage and the degree of coupling
Linear corresponding relation, wherein U be rectification module 4 output voltage, k is the degree of coupling, UINFor the input voltage of rectification module 4,
LPFor the inductance of the primary side of resonance modules 3, LSFor the inductance on the secondary side of resonance modules 3, can also be obtained by the way of test
The one-to-one linear relationship of DC voltage and the degree of coupling out.
For the degree of coupling of detection system, need to generate one and the one-to-one electrical parameter of degree of coupling coefficient on circuit,
The degree of coupling is as one of core parameter in WPT, and most parameter is all related with the degree of coupling in circuit, so many electricity in circuit
The variation of parameter can reflect the system degree of coupling with side, but the parameter and the degree of coupling are needed if being able to detect the degree of coupling
Relationship be it is one-to-one, the relationship for constructing one-to-one relationship by multi-parameter is again excessively complicated, and examines to improve
If surveying accuracy, then the degree of coupling needs in a linear relationship with electrical parameter, so the method for the present embodiment is exactly disconnected using load
The relationship of road and frequency electromagnetic waves one electrical parameter of creation, the electrical parameter and the degree of coupling is approximately one-to-one linear relationship,
Relational equation isWherein, linear coefficient is constantThe coefficient can basis simultaneously
Design needs to carry out certain variation.
Fig. 4 is the output voltage and degree of coupling corresponding diagram of rectification module in the present embodiment, it can be seen that whole in the present embodiment
The output voltage and the degree of coupling of flow module are in one-to-one linear relationship, and linear coefficient is constant
Claims (10)
1. a kind of method for detecting the wireless charging degree of coupling, radio energy transmission system is by power supply, voltage regulating module (1), inversion mould
Block (2), resonance modules (3), rectification module (4), turn-off module (5), load are sequentially connected in series, the power supply, the pressure regulation
The primary side of module (1), the inverter module (2) and the resonance modules (3) constitutes transmitting terminal, the pair of the resonance modules (3)
Side, the rectification module (4), the turn-off module (5) and the load constitute receiving end, which is characterized in that the method packet
Include following steps:
Step 1: enabling the load cut-off of the receiving end；
Step 2: the transmitting terminal generates the alternating current of a high frequency, and emits a high frequency magnetic field, institute on transmitting end-coil
The frequency for stating high frequency magnetic field is twice or more of the radio energy transmission system resonance frequency；
Step 3: the reception end-coil receives the high frequency magnetic field and generates an alternating current, and the alternating current passes through rectification
A DC voltage, DC voltage described in real-time detection are generated with filtering；
Step 4: the DC voltage and the degree of coupling will test for linear corresponding relation according to the linear corresponding relation
The DC voltage is converted to the degree of coupling.
2. the method for the detection wireless charging degree of coupling as described in claim 1, it is characterised in that: in the step 1, pass through institute
It states turn-off module (5) and implements tripping action.
3. the method for the detection wireless charging degree of coupling as described in claim 1, it is characterised in that: in the step 2, the hair
Penetrate the alternating current that end generates a high frequency by the inverter module (2).
4. the method for the detection wireless charging degree of coupling as described in claim 1, it is characterised in that: in the step 4, by turning
Change formulaThe DC voltage that will test is converted to the degree of coupling；Wherein, U is the direct current
Pressure, i.e., the output voltage of the described rectification module (4)；K is the degree of coupling, UINFor the input voltage of the rectification module (4), LPFor institute
State the inductance of the primary side of resonance modules (3), LSFor the inductance on the secondary side of the resonance modules (3).
5. the method for the detection wireless charging degree of coupling as described in claim 1, it is characterised in that: logical in advance in the step 4
The mode for crossing test obtains the linear corresponding relation of the DC voltage and the degree of coupling, will examine further according to the linear corresponding relation
The DC voltage measured is converted to the degree of coupling.
6. a kind of system for detecting the wireless charging degree of coupling, radio energy transmission system is by power supply, voltage regulating module (1), inversion mould
Block (2), resonance modules (3), rectification module (4), turn-off module (5), load are sequentially connected in series, it is characterised in that: described humorous
The primary side of vibration module (3) connects the first signal pickup assembly, and first signal pickup assembly connects the first control module, described
First control module connects the voltage regulating module (1) and the inverter module (2)；The secondary side connection the of the resonance modules (3)
Binary signal acquisition device, the second signal acquisition device connect the second control module, described in the second control module connection
Turn-off module (5).
7. the system of the detection wireless charging degree of coupling as claimed in claim 6, it is characterised in that: the turn-off module (5) is
Switching tube or relay.
8. the system of the detection wireless charging degree of coupling as claimed in claim 6, it is characterised in that: the load is battery, institute
Stating turn-off module (5) is diode.
9. the system of the detection wireless charging degree of coupling as claimed in claim 6, it is characterised in that: the first signal acquisition dress
The first micro-control unit of connection is set, first micro-control unit connects first control module；The second signal acquisition
Device connects the second micro-control unit, and second micro-control unit connects second control module.
10. the system of the detection wireless charging degree of coupling as claimed in claim 9, it is characterised in that: the first microcontroller list
Member the first communication module of connection, second micro-control unit connect the second communication module, and first communication module connects institute
State the second communication module.
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Cited By (9)
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| CN110764023A (en) * | 2019-09-18 | 2020-02-07 | 华为技术有限公司 | Rectifier chip and terminal equipment |
| CN111934444A (en) * | 2020-08-12 | 2020-11-13 | 安洁无线科技（苏州）有限公司 | Wireless charging protection system and method |
| CN111934722A (en) * | 2020-08-17 | 2020-11-13 | 金华飞光科技有限公司 | Wireless energy transfer, communication and networking system based on coil |
| CN112152330A (en) * | 2020-09-30 | 2020-12-29 | 西南交通大学 | IPT system based on current doubling rectification & half-bridge inversion and efficiency improving method thereof |
| CN112260419A (en) * | 2020-10-13 | 2021-01-22 | 南京和若源电气有限公司 | Wireless power transmission system and start-stop method |
| CN112865330A (en) * | 2021-01-21 | 2021-05-28 | 浙江大学 | Modular wireless charging system for realizing same-side coil decoupling |
| CN112865331A (en) * | 2021-01-21 | 2021-05-28 | 浙江大学 | Modular wireless charging system for realizing decoupling of double-row same-side coils |
| CN113746208A (en) * | 2021-07-30 | 2021-12-03 | 广西电网有限责任公司电力科学研究院 | Non-contact power supply system state monitoring system |
| CN117559669A (en) * | 2023-10-31 | 2024-02-13 | 宁波道充科技有限公司 | Wireless power transmission system for realizing resonance tracking through low-frequency pulse control |
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| CN110764023A (en) * | 2019-09-18 | 2020-02-07 | 华为技术有限公司 | Rectifier chip and terminal equipment |
| CN111934444A (en) * | 2020-08-12 | 2020-11-13 | 安洁无线科技（苏州）有限公司 | Wireless charging protection system and method |
| CN111934444B (en) * | 2020-08-12 | 2022-03-22 | 安洁无线科技（苏州）有限公司 | Wireless charging protection system and method |
| CN111934722A (en) * | 2020-08-17 | 2020-11-13 | 金华飞光科技有限公司 | Wireless energy transfer, communication and networking system based on coil |
| CN112152330A (en) * | 2020-09-30 | 2020-12-29 | 西南交通大学 | IPT system based on current doubling rectification & half-bridge inversion and efficiency improving method thereof |
| CN112260419A (en) * | 2020-10-13 | 2021-01-22 | 南京和若源电气有限公司 | Wireless power transmission system and start-stop method |
| CN112865330A (en) * | 2021-01-21 | 2021-05-28 | 浙江大学 | Modular wireless charging system for realizing same-side coil decoupling |
| CN112865331A (en) * | 2021-01-21 | 2021-05-28 | 浙江大学 | Modular wireless charging system for realizing decoupling of double-row same-side coils |
| CN112865331B (en) * | 2021-01-21 | 2022-05-27 | 浙江大学 | Modular wireless charging system for realizing decoupling of double-row same-side coils |
| CN112865330B (en) * | 2021-01-21 | 2022-05-27 | 浙江大学 | Modular wireless charging system for realizing same-side coil decoupling |
| CN113746208A (en) * | 2021-07-30 | 2021-12-03 | 广西电网有限责任公司电力科学研究院 | Non-contact power supply system state monitoring system |
| CN117559669A (en) * | 2023-10-31 | 2024-02-13 | 宁波道充科技有限公司 | Wireless power transmission system for realizing resonance tracking through low-frequency pulse control |
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Application publication date: 20190820 |