CN107248788B - Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop - Google Patents
Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop Download PDFInfo
- Publication number
- CN107248788B CN107248788B CN201710454705.4A CN201710454705A CN107248788B CN 107248788 B CN107248788 B CN 107248788B CN 201710454705 A CN201710454705 A CN 201710454705A CN 107248788 B CN107248788 B CN 107248788B
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- locked loop
- wireless
- electric energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 230000008859 change Effects 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 230000005291 magnetic effect Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000011217 control strategy Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
-
- 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
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
-
- 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
-
- H02J7/0026—
-
- H02J7/025—
-
- 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
-
- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Electromagnetism (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an electric vehicle wireless charging system and method for detecting foreign matters by adopting a phase-locked loop, wherein the system comprises a wireless electric energy transmitting device, a wireless electric energy receiving device, the phase-locked loop and a detection signal processor, wherein the wireless electric energy transmitting device is magnetically coupled with the wireless electric energy receiving device and transmits electromagnetic waves with certain frequency to the wireless electric energy receiving device; the wireless electric energy transmitting device is connected with a phase-locked loop to detect the voltage and the current phase of the electric energy transmitting terminal, and the detection signal processor judges the mixing of the metal foreign matters by reading the change of the voltage and the current phase; the wireless power receiving device transmits the received high-frequency electromagnetic waves to two ends of a load battery, and charging of the equipment is achieved.
Description
Technical Field
The invention relates to an electric vehicle wireless charging system and method for detecting foreign matters by adopting a phase-locked loop.
Background
With the increasing exhaustion of fossil fuels and the increasing global warming, electric vehicles are increasingly favored as a green travel mode. The electric sightseeing bus arrives at scenic spots and the municipal buses, and the electric vehicles already go deep into all corners of the city. Due to the limitation of the prior art, the battery endurance of the electric vehicle is limited, so the charging problem needs to be solved urgently.
At present, the charging modes of the electric automobile mainly comprise two modes: one is wired charging, also called contact charging; the other is wireless charging, also called non-contact charging. The wireless charging of the electric automobile is a novel charging mode which is provided aiming at various weaknesses of wired charging. Compare in wired charging, wireless charging does not need the electrical connection, does not have wear and tear ageing problems such as contact spark, need hardly take up an area of moreover, can accomplish remote control and dispatch, and more be fit for adverse circumstances and use moreover, just because these advantages, the wireless charging of electric automobile is regarded as the development direction in the electric automobile field of charging of future.
However, when metal foreign matter is mixed in the electromagnetic coupling area of the wireless charging system, the temperature of the metal can be rapidly increased due to the metal magnetic effect and the eddy current effect, and a fire can be possibly caused in the serious situation, so that a great potential safety hazard exists. In addition, when a small organism mistakenly breaks into the wireless charging coupling area, the small organism is easily damaged by high-frequency electromagnetic waves, and tragedy occurs. Safety issues are critical to the development of electric vehicles, and therefore the problem of detecting foreign metal is urgently needed to be solved.
At present, in the field of wireless charging of electric vehicles, proposed metal foreign matter detection methods include a balance coil detection method and an infrared thermal sensor detection method. Although the detection method can detect the metal foreign matters, the method needs to add a detection mechanism in addition to the wireless charging system, which increases the complexity of the charging system and the cost of the device.
Disclosure of Invention
The invention provides an electric vehicle wireless charging system and method for detecting foreign matters by adopting a phase-locked loop, which aim to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wireless charging system of an electric vehicle for detecting foreign matters by adopting a phase-locked loop comprises a wireless power transmitting device, a wireless power receiving device, the phase-locked loop and a detection signal processor, wherein the wireless power transmitting device is magnetically coupled with the wireless power receiving device and transmits electromagnetic waves with certain frequency to the wireless power receiving device; the wireless electric energy transmitting device is connected with a phase-locked loop to detect the voltage and the current phase of the electric energy transmitting terminal, and the detection signal processor judges the mixing of metal foreign matters by reading the change of the voltage and the current phase; the wireless power receiving device transmits the received high-frequency energy to two ends of the load battery, and charging of the equipment is achieved.
The wireless electric energy transmitting device comprises an alternating current power supply, a bridge type uncontrollable rectifying circuit, a direct current chopper circuit, a fixed frequency inverter circuit, a transmitting end inductance coil and a resonance capacitor which are sequentially connected.
Furthermore, the alternating current power supply obtains direct current through the bridge rectifier circuit, carries out DC/DC step-down chopping on the direct current to realize continuous adjustment of output voltage, and the adjusted direct current voltage is input into the full-bridge inverter circuit, and the switching speed of the full-bridge inverter circuit is fixed on the resonance frequency of the system, and energy is continuously transmitted to the receiving end through the magnetic coupling structure.
Furthermore, the wireless power receiving device comprises a receiving end inductance coil, a resonance capacitor, a high-frequency rectifying circuit, a voltage stabilizing circuit and a load storage battery which are connected in sequence, wherein high-frequency alternating current output by the receiving end inductance coil is converted into stable direct current through the high-frequency rectifying circuit and the voltage stabilizing circuit and is transmitted to two ends of the load battery, and charging of equipment is achieved.
Further, the transmitting end inductance coil and the receiving end inductance coil form magnetic coupling.
Furthermore, two phase-locked loops are adopted to respectively phase-lock the terminal voltage phase of the transmitting end inductance coil and the phase of current flowing through the inductance coil.
Furthermore, the phase-locked loop comprises a phase discriminator, a loop filter and a voltage-controlled oscillator, wherein the phase discriminator detects the phase difference between an input signal and an output signal and converts the detected phase difference signal into a UDOutputting voltage signal, filtering the signal by low-pass filter to form control voltage U of voltage-controlled oscillatorCFor frequency implementation of oscillator output signalAnd controlling to finally realize the phase synchronization of the signal input into the phase discriminator of the phase-locked loop and the output signal of the voltage-controlled oscillator.
Furthermore, the detection signal processor is commonly used for the voltage and current phase detection circuit, the direct current chopper circuit and the inverter circuit.
When metal foreign matters are mixed in the energy coupling area, the equivalent inductance of the transmitting coil of the wireless electric energy transmitting device is changed due to the metal magnetic effect, and the equivalent inductance of the inductance coil is changed due to the fact that the capacitance value of the wireless electric energy transmitting device is fixed and unchanged, so that the capacitance and the inductance are detuned.
Based on the working method of the system, the phase of the terminal voltage of the coil of the wireless power transmitting end and the phase of the current flowing through the inductor are monitored in real time through the phase-locked loop, and the phase difference change of the voltage phase and the current phase is used as a basis for judging the mixing of the metal foreign matters. Under the normal charging condition when no metal foreign matter is mixed into the wireless electric energy coupling area, the voltage and the current obtained by the phase-locked loop are in the same phase; when the metal foreign matter is mistakenly inserted into the energy transmission area, the equivalent inductance value of the transmitting coil is changed under the action of the magnetic effect of the mixed metal, and the phase difference between the current flowing through the inductor and the voltage of the inductor is not zero.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, no additional detection device is needed, and the mixing of the metal foreign matters is judged by detecting the voltage of the electric energy emission end and the phase change of the current, so that the economical and practical combination is realized.
The method can realize real-time monitoring, and the processor adopted by the detection circuit is the processor in the wireless charging circuit, so that the detection system is started from the beginning of charging. In the process from the beginning of charging the electric vehicle to the completion of charging, any metal foreign matter is mixed in to cause the detuning of the inductance and the capacitance of the transmitting end, so the proposed metal detection method has the characteristic of real-time property.
The traditional metal detection method adopts a detection method of adding a balance coil and an infrared thermal induction detection method, and an additional set of detection device is needed. The detection sensitivity and precision of the infrared thermal imager are low, the infrared thermal imager can be detected only after the metal is heated, and potential safety hazards exist in the metal heating process. The invention carries out metal detection by detecting the voltage and current phases of the charging device, thereby greatly saving the cost of the device.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is an equivalent circuit diagram of an electromagnetic resonance type wireless charging system adopting a series resonance structure;
fig. 2 is a topological diagram of a wireless charging system with a metal detection function proposed in the present invention;
FIG. 3 is a metal detection system topology as set forth in the present invention;
FIG. 4 is a diagram of a phase locked loop architecture;
FIG. 5 is a diagram showing waveforms of voltage and current of the transmitting coil after metal is mixed.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, there is a need to add a detection mechanism in addition to a wireless charging system in the prior art, which increases the complexity of the charging system and the cost of the device, and in order to solve the above technical problems, the present application provides an electric vehicle wireless charging system using a phase-locked loop technology to detect a metal foreign object, including: a wireless power transmitting device; a wireless power receiving device; a phase-locked loop; a detection signal processor. In the magnetic coupling resonance type wireless charging system adopting the voltage regulation control strategy, the inductance and the capacitance of the transmitting coil and the receiving coil are in a complete resonance state. After the wireless electric energy transmission area is mixed with metal, the magnetic effect of the metal foreign matter enables the inductance value of the transmitting coil of the electric energy transmitting end to change, and the inductance and the capacitance of the transmitting end are detuned. The invention judges whether metal foreign matters enter a wireless charging electromagnetic coupling area or not by detecting the voltage phase of the transmitting coil end and the phase change of current flowing through the transmitting coil through the phase-locked loop. According to the metal foreign matter detection method based on the phase-locked loop technology, an additional detection device is not needed, and the fact that metal foreign matters enter a wireless electric energy transmission area is judged by detecting the influence of the metal foreign matters on the voltage and current phases of a wireless charging system of an electric vehicle.
The wireless charging technology is mainly divided into three types: radio frequency or microwave wireless power supply technology, electromagnetic induction type wireless power supply technology and electromagnetic resonance type wireless power supply technology. The microwave wireless power supply technology is a long-distance radiation energy transmission method, and has the following disadvantages of strong radiation, low transmission efficiency and the like; the electromagnetic induction type wireless power supply technology cannot be applied to the field of wireless charging of electric vehicles at present because the transmission distance is short;
the invention mainly aims at electromagnetic resonance type wireless charging. The advantages of the electromagnetic resonance wireless charging technology are as follows: the electric energy transmitting end and the receiving end respectively resonate in capacitance and inductance; the resonance frequency is consistent with the natural frequency of the system; the transmitting coil and the receiving coil are coupled with each other; the method has the advantages of long transmission distance, high transmission efficiency and the like.
At present, electromagnetic waves with frequencies of 51kHz and 85kHz are generally adopted internationally to transmit electric energy. In view of the principle of the electromagnetic resonance type wireless charging technology, the capacitance and inductance values of the transmitting end and the receiving end are designed and matched according to the frequency requirement. The transmission efficiency of the system is highest when both the transmitting end and the receiving end are in a full resonance state.
There are four common resonant modes for an electromagnetic resonant wireless charging system, including: the transmitting coil is in series resonance, and the receiving coil is in series resonance (series type); the transmitting coil is in series resonance, and the receiving coil is in parallel resonance (series-parallel mode); the transmitting coil is in parallel resonance, and the receiving coil is in series resonance (parallel-series type); the transmitting coil is parallel-resonant and the receiving coil is parallel-resonant (parallel-parallel). We take the most common series resonant topology as an example, and the circuit structure is shown in fig. 1. At this time, a circuit in which the inductor and the capacitor are connected in series generates series resonance, voltages on the inductor and the capacitor are equal in magnitude and opposite in phase, and the series resonance circuit is equivalent to a short circuit.
The invention adopts the following technical scheme:
the invention is suitable for an electromagnetic resonance type wireless electric energy transmission system, as shown in figure 2, and comprises a wireless electric energy transmitting device; a wireless power receiving device; a phase-locked loop; a detection signal processor (ARM).
The wireless power transmitting apparatus includes: the device comprises an alternating current 220V power supply, a bridge type uncontrollable rectifying circuit consisting of diodes, a direct current chopper circuit and a fixed frequency inverter circuit. The input 220V alternating current obtains direct current of about 310V through a bridge rectifier circuit formed by diodes, and the direct current of 310V is subjected to DC/DC buck chopping, so that continuous adjustability from 0V to 310V can be realized. And the regulated direct-current voltage is input into a full-bridge inverter circuit, the switching speed of the full-bridge inverter circuit is fixed on the system resonant frequency, and the energy is continuously transmitted to a receiving end through a magnetic coupling structure.
The wireless power receiving apparatus includes: the high-frequency rectifier circuit, voltage stabilizing circuit, load battery. The high-frequency alternating current output by the receiving coil is converted into stable direct current through the high-frequency rectifying circuit and the voltage stabilizing circuit and is transmitted to two ends of the load battery, so that equipment is charged.
The metal foreign matter detection circuit is shown in a block part in fig. 3 and comprises two parts: a phase-locked loop; a signal processor (ARM).
As shown in fig. 4, the phase-locked loop circuit includes: a Phase Detector (PD), a Loop Filter (LF) and a Voltage Controlled Oscillator (VCO).
Two phase-locked loops are adopted to respectively carry out phase locking on the voltage phase of the transmitting end inductance coil end and the phase of current flowing through the inductance coil.
The phase-locked loop functions as follows: the Phase Detector (PD), also called phase comparator, detects the phase difference between an input signal and an output signal and converts the detected phase difference signal into UDOutputting voltage signal, filtering the signal by low-pass filter to form control voltage U of voltage-controlled oscillatorCThe frequency of the oscillator output signal is controlled. And finally, the phase of the signal input into the phase discriminator of the phase-locked loop is synchronous with the phase of the output signal of the voltage-controlled oscillator.
The signal processor is an STM32F407ZGT6 chip. The core of the chip is cortex-M4 ARM. The processor used by the voltage and current phase detection circuit and the direct current chopper circuit and the inverter circuit in the wireless charging system share the same processor.
When the energy coupling area is mixed with metal foreign matters, the equivalent inductance of the transmitting coil is changed due to the metal magnetic effect. Because the capacitance value of the transmitting end is fixed and unchanged, the equivalent inductance value of the inductance coil is changed, and the capacitance and the inductance of the transmitting end are detuned. By utilizing the phenomenon, a metal foreign matter detection method based on the phase-locked loop technology is provided.
For a wireless charging system adopting a voltage-regulating charging control strategy, the capacitance and the inductance of a transmitting end are in a complete resonance state, and the phase difference between the end voltage and the current of a coil is zero. Real-time monitoring of coil terminal voltage (U) of wireless power transmitting terminalL) Phase and current (I) through the inductorL) And in phase, under the normal charging condition when no metal foreign matter is mixed into the wireless electric energy coupling region, the voltage and the current obtained by the phase-locked loop are in the same phase. When the metal foreign body is mistakenly inserted into the energy transmission area, the equivalent inductance value of the transmitting coil is changed due to the effect of the magnetic effect of the mixed metal. At this time, the inductance and the capacitance at the transmitting end are detuned, and the phase difference between the current flowing through the inductance and the voltage at the inductance is not zero, as shown in fig. 5. The voltage and current phases respectively measured by a phase-locked loop (PLL) are input into an ARM processor, and the phase difference change is detected and used as judgment of the metal abnormityThe basis for mixing the materials.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (6)
1. The utility model provides an adopt phase-locked loop to carry out wireless charging system of electric automobile of foreign matter detection which characterized by: the wireless power transmission device is magnetically coupled with the wireless power receiving device and used for transmitting high-frequency electromagnetic waves with certain frequency to the wireless power receiving device; the wireless electric energy transmitting device is connected with a phase-locked loop to detect the terminal voltage phase of a coil at an electric energy transmitting end and the phase of current flowing through an inductance coil, and the detection signal processor judges the mixing of metal foreign matters by reading the change of the voltage phase and the current phase; the wireless electric energy receiving device transmits the received electromagnetic energy to two ends of a load battery to charge the equipment;
two phase-locked loops are adopted to respectively phase-lock the terminal voltage phase of the transmitting end inductance coil and the phase of current flowing through the inductance coil;
for a wireless charging system adopting a voltage-regulating charging control strategy, a transmitting end capacitor and an inductor are in a complete resonance state, the phase difference between the coil end voltage and the current is zero, when metal foreign matters are mixed in an energy coupling area, the equivalent inductance of the transmitting coil of the wireless electric energy transmitting device is changed due to the metal magnetic effect, and the capacitance value of the wireless electric energy transmitting device is fixed and unchanged, the equivalent inductance of the inductor is changed, so that the detuning of the capacitor and the inductor is caused;
monitoring the terminal voltage phase of a coil of a wireless power transmitting terminal and the current phase flowing through an inductor in real time through a phase-locked loop, and taking the phase difference change of the voltage phase and the current phase as a basis for judging the mixing of metal foreign matters; under the normal charging condition when no metal foreign matter is mixed into the wireless electric energy coupling area, the voltage and the current obtained by the phase-locked loop are in the same phase; when metal foreign matters are mistakenly introduced into the energy transmission area, the equivalent inductance value of the transmitting coil is changed under the action of the magnetic effect of the mixed metal, and the phase difference between the current flowing through the inductor and the voltage of the inductor is not zero;
the phase-locked loop comprises a phase discriminator, a loop filter and a voltage-controlled oscillator, wherein the phase discriminator detects the phase difference between an input signal and an output signal, converts the detected phase difference signal into a UD voltage signal for output, forms a control voltage UC of the voltage-controlled oscillator after the signal is filtered by a low-pass filter, controls the frequency of the output signal of the oscillator, and finally realizes the phase synchronization of the signal input into the phase discriminator of the phase-locked loop and the phase of the output signal of the voltage-controlled oscillator.
2. The wireless charging system for the electric vehicle adopting the phase-locked loop to detect the foreign matters as claimed in claim 1, wherein: the wireless electric energy transmitting device comprises an alternating current power supply, a bridge type uncontrollable rectifying circuit, a direct current chopper circuit, a fixed frequency inverter circuit, a transmitting end inductance coil and a resonance capacitor which are sequentially connected.
3. The wireless charging system for the electric vehicle adopting the phase-locked loop to detect the foreign matters as claimed in claim 2, wherein: the alternating current power supply obtains direct current through the bridge rectifier circuit, carries out DC/DC step-down chopper on the direct current so as to realize continuous adjustment of output voltage, and the direct current voltage after adjustment is input into the full-bridge inverter circuit, and the switching speed of the full-bridge inverter circuit is fixed on the resonance frequency of the system, and energy is continuously transmitted to a receiving end through the magnetic coupling structure.
4. The wireless charging system for the electric vehicle adopting the phase-locked loop to detect the foreign matters as claimed in claim 1, wherein: the wireless electric energy receiving device comprises a receiving end inductance coil, a resonance capacitor, a high-frequency rectifying circuit, a voltage stabilizing circuit and a load battery which are sequentially connected, wherein high-frequency alternating current output by the receiving end inductance coil is changed into stable direct current through the high-frequency rectifying circuit and the voltage stabilizing circuit and is transmitted to two ends of the load battery, and equipment is charged.
5. The wireless charging system for the electric vehicle adopting the phase-locked loop to detect the foreign matters as claimed in claim 3, wherein: and the transmitting end inductance coil and the receiving end inductance coil form magnetic coupling.
6. The wireless charging system for the electric vehicle adopting the phase-locked loop to detect the foreign matters as claimed in claim 1, wherein: the detection signal processor is commonly used for the voltage and current phase detection circuit, the direct current chopper circuit and the inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710454705.4A CN107248788B (en) | 2017-06-15 | 2017-06-15 | Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710454705.4A CN107248788B (en) | 2017-06-15 | 2017-06-15 | Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107248788A CN107248788A (en) | 2017-10-13 |
| CN107248788B true CN107248788B (en) | 2020-12-22 |
Family
ID=60018150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710454705.4A Active CN107248788B (en) | 2017-06-15 | 2017-06-15 | Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107248788B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707034B (en) * | 2017-10-25 | 2020-10-30 | 西南交通大学 | Sending end dynamic tuning device and method based on double inverters |
| CN108173359A (en) * | 2018-02-06 | 2018-06-15 | 深圳劲芯微电子有限公司 | The method and its circuit of wireless charging foreign matter are differentiated based on Q values |
| CN108375797B (en) * | 2018-02-26 | 2019-12-27 | 中惠创智无线供电技术有限公司 | System for detecting foreign matters through sampling current phase difference |
| CN108494073B (en) * | 2018-03-26 | 2020-07-28 | 深圳赫兹创新技术有限公司 | Metal foreign matter detection method and magnetic coupling resonant wireless charging device |
| CN109038850B (en) * | 2018-06-25 | 2020-07-24 | 华为技术有限公司 | Device, equipment and method for detecting metal foreign matters in wireless charging system |
| CN108923552A (en) * | 2018-07-27 | 2018-11-30 | 浙江泰米电子科技有限公司 | A kind of wireless charging foreign bodies detection circuit and method |
| CN109004759B (en) * | 2018-08-07 | 2021-04-27 | 吉林大学 | Metal barrier discernment and automatic clear's wireless charging system of car |
| CN109193889A (en) * | 2018-10-24 | 2019-01-11 | 中尔（深圳）电能科技有限公司 | Wireless charging system |
| JP7104249B2 (en) * | 2018-10-31 | 2022-07-20 | 華為技術有限公司 | Power receiving devices for wireless charging, methods, terminals, and systems |
| CN109888894A (en) * | 2019-03-11 | 2019-06-14 | 太原理工大学 | A kind of wireless charging high frequency electric source |
| CN110146927B (en) | 2019-05-16 | 2022-02-15 | 京东方科技集团股份有限公司 | Charging system, foreign matter detection method and component, and charging control method and device |
| TWI757724B (en) * | 2020-04-14 | 2022-03-11 | 國立虎尾科技大學 | Wireless power transmitter and power supply having the same |
| CN113644755A (en) * | 2020-05-11 | 2021-11-12 | 丸荣机械股份有限公司 | Vibration processing device and power supply system and wireless power transmitter thereof |
| CN111775739A (en) * | 2020-07-17 | 2020-10-16 | 中兴新能源汽车有限责任公司 | Foreign matter detection method, device and system for wireless charging system and electronic equipment |
| CN113103887B (en) * | 2021-04-08 | 2022-11-22 | 中国第一汽车股份有限公司 | Charging pairing method and device, electronic equipment, system and storage medium |
| CN114094723A (en) * | 2021-11-19 | 2022-02-25 | 深圳威迈斯新能源股份有限公司 | Wireless charging transmitting terminal |
| CN114024374B (en) * | 2021-11-23 | 2023-12-15 | 桔充充(杭州)新能源有限公司 | Wireless charging system of two-wheeled electric vehicle and foreign matter detection and power adjustment method |
| CN114627604A (en) * | 2022-02-22 | 2022-06-14 | 北京无线电计量测试研究所 | Underground pipe gallery state monitoring and early warning method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015037291A1 (en) * | 2013-09-13 | 2015-03-19 | 株式会社 テクノバ | Contactless power supply device capable of detecting metallic foreign objects and metallic foreign object detection method therefor |
| CN104716725A (en) * | 2015-04-15 | 2015-06-17 | 山东大学 | Electric vehicle wireless charging system with metal foreign substance detection |
| CN105790324A (en) * | 2014-12-16 | 2016-07-20 | 财团法人车辆研究测试中心 | Wireless charging system and metal foreign body detection method thereof |
| CN205829320U (en) * | 2016-07-22 | 2016-12-21 | 桂林电子科技大学 | A kind of magnet coupled resonant type wireless energy transmission system |
-
2017
- 2017-06-15 CN CN201710454705.4A patent/CN107248788B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015037291A1 (en) * | 2013-09-13 | 2015-03-19 | 株式会社 テクノバ | Contactless power supply device capable of detecting metallic foreign objects and metallic foreign object detection method therefor |
| CN105790324A (en) * | 2014-12-16 | 2016-07-20 | 财团法人车辆研究测试中心 | Wireless charging system and metal foreign body detection method thereof |
| CN104716725A (en) * | 2015-04-15 | 2015-06-17 | 山东大学 | Electric vehicle wireless charging system with metal foreign substance detection |
| CN205829320U (en) * | 2016-07-22 | 2016-12-21 | 桂林电子科技大学 | A kind of magnet coupled resonant type wireless energy transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107248788A (en) | 2017-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107248788B (en) | Electric vehicle wireless charging system and method for detecting foreign matters by adopting phase-locked loop | |
| CN109038850B (en) | Device, equipment and method for detecting metal foreign matters in wireless charging system | |
| EP2685601B1 (en) | Wireless power transfer method, apparatus and system | |
| EP3142212A1 (en) | Wireless power transmission system and power transmission device of wireless power transmission system | |
| CN107134858A (en) | Radio energy transmission system and its metal foreign matter detecting method | |
| CN107124046B (en) | Wireless charging system with living body detection function and wireless charging method | |
| CN110554236B (en) | Frequency online detection method for constant voltage or constant current output of wireless power transmission | |
| US10256675B2 (en) | Power-supplying device and wireless power supply system | |
| EP3306781A1 (en) | Wireless power transmission system and method for driving same | |
| US11482941B2 (en) | Phase alignment circuit and method of receive end, and receive end | |
| CN110429718B (en) | Constant-current/constant-voltage control method of wireless power transmission system based on primary side parameter identification | |
| CN111386646B (en) | Wireless charging receiving device, method, terminal and system | |
| CN101834473A (en) | Resonant tracking non-contact power supply device and power supply method | |
| CN110707831B (en) | Transmitting side switching three-coil constant-current constant-voltage induction type wireless charging method and system | |
| US11190042B2 (en) | Wireless charging transmitting apparatus, transmitting method, and wireless charging system | |
| CN103427500B (en) | Detection device and detection method for illegal load of IPT (inductive power transfer) system | |
| CN207339431U (en) | Radio energy transmission system | |
| EP4344022A1 (en) | Transmitting end and receiving end for wireless charging, and wireless charging system | |
| CN111431259B (en) | Wireless charging starting method and device and storage medium | |
| CN110544975A (en) | single-tube constant-current constant-voltage wireless charging device and control method thereof | |
| EP3101781B1 (en) | Power supply apparatus | |
| CN107199901B (en) | Electric automobile wireless charging device with normal line type multi-coil magnetic gathering function | |
| CN211236016U (en) | Frequency online detection circuit for constant voltage or constant current output in wireless power transmission | |
| EP3776790A1 (en) | A power transfer system for electric vehicles and a control method thereof | |
| CN106505749B (en) | Method for stabilizing resonant frequency of resonant wireless power transmission coil by fractional order capacitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20190929 Address after: W401w403-2, Shenzhen Hong Kong industry university research base, No. 015, gaoxinnan 7th Road, high tech Zone, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Hertz Innovation Technology Co., Ltd. Address before: 250061 Ji'nan Road, Shandong, No. ten, No. 17923 Applicant before: Shandong University |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |