CN112510853A - Dynamic wireless charging foreign matter detection method for electric automobile - Google Patents

Dynamic wireless charging foreign matter detection method for electric automobile Download PDF

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Publication number
CN112510853A
CN112510853A CN202110170818.8A CN202110170818A CN112510853A CN 112510853 A CN112510853 A CN 112510853A CN 202110170818 A CN202110170818 A CN 202110170818A CN 112510853 A CN112510853 A CN 112510853A
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diode
current
actual
phase difference
circuit
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CN112510853B (en
Inventor
费益军
殷勇
肖宇华
徐妍
杨庆胜
刘屿
吴涛
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State Grid Jiangsu Electric Power Co Ltd
Jiangsu Fangtian Power Technology Co Ltd
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Jiangsu Fangtian Power Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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)
  • Computer Networks & Wireless Communication (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a dynamic wireless charging foreign matter detection method for an electric automobile, which comprises the steps of calculating the output current of an inverter circuit when a primary side compensation circuit has no foreign matter when the electric automobile is in a charging state or a non-charging state; calculating the phase difference between the output current and the output voltage under the two states; calculating the output current of the inverter circuit when the electric automobile is in a charging state and a non-charging state and the foreign matter exists in the side compensation circuit; calculating the phase difference between the output current and the output voltage under the two states; detecting actual current and actual voltage of the inverter circuit in real time and actual phase difference between the actual current and the actual voltage; and judging whether the electric automobile is in different states or not, wherein the primary side compensation circuit and the secondary side compensation circuit have different objects. The method has simple steps, easy realization and strong practicability.

Description

Dynamic wireless charging foreign matter detection method for electric automobile
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a dynamic wireless charging foreign matter detection method for an electric vehicle.
Background
The traditional wired charging mode of the electric automobile has a series of problems, such as: the charging circuit is easy to age, the charging plug is easy to leak electricity, the charging plug is easy to generate sparks, and the like. The wireless charging mode of the electric automobile is a non-contact electric energy transmission technology, can effectively avoid the problems of line aging, electric leakage, spark and the like in wired charging, and improves the safety and reliability of the charging of the electric automobile. In the charging process of the electric automobile, the existence of foreign matters between the transmitting coil and the receiving coil can influence the charging voltage, current, efficiency and the like, and the problem is more prominent during dynamic charging, so that whether the foreign matters exist in a wireless charging system needs to be monitored in real time in the charging process.
Disclosure of Invention
The invention provides a dynamic wireless charging foreign matter detection method for an electric vehicle, aiming at the defects of the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a foreign matter detection system for dynamic wireless charging of an electric automobile is used for dynamic wireless charging of the electric automobile and comprises a fixed power supply system and a mobile charging system, wherein the mobile charging system is positioned in a wireless charging area;
the fixed power supply system comprises a direct-current power supply, an inverter circuit and a primary side compensation circuit which are sequentially connected into a loop; the mobile charging system comprises a secondary side compensation circuit, a rectification circuit and a load resistor R which are sequentially connected into a loopL；
The primary side compensation circuit is wirelessly connected with the secondary side compensation circuit, the inverter circuit is electrically connected with the current and voltage sampling circuit and the DSP controller, the current and voltage sampling circuit is used for collecting current and voltage output by the inverter circuit and transmitting the current and voltage to the DSP controller, and the DSP controller is used for judging whether the electric automobile is in a wireless charging area or not according to the change of the current value and judging whether foreign matters exist between the primary side compensation circuit and the secondary side compensation circuit or not according to the change of the voltage value.
In order to optimize the technical scheme, the specific measures adopted further comprise:
further, the inverter circuit comprises a first parallel circuit and a second parallel circuit, the first parallel circuit and the second parallel circuit are both connected with the direct-current power supply, and the first parallel circuit comprises switch tubes S connected in series1And a switching tube S2The second parallel circuit comprises a switching tube S connected in series3And a switching tube S4。
Further, the primary side compensation circuit comprises compensation inductors L which are sequentially connected in series1Transmitting coil LTAnd a compensation capacitor CTAt the transmitting coil LTAnd a compensation capacitor CTBoth ends of the capacitor are connected in parallel with a compensation capacitor C1The second parallel line and a compensation capacitor CTIn series, the first parallel line and the compensation inductance L1Are connected in series.
Further, the secondary side compensation circuit comprises compensation inductors L which are sequentially connected in series2Receiving coil LRAnd a compensation capacitor CRThe receiving coil LRAnd a compensation capacitor CRBoth ends of the capacitor are connected in parallel with a compensation capacitor C2。
Further, the rectifying circuit includes a diode VD1Diode VD2Diode VD3Diode VD4Filter capacitor C3Said diode VD1Diode VD2Diode VD3Diode VD4Constitute a single-phase bridge type uncontrolled rectifying circuit, the compensation inductor L2And diode VD1Diode VD2In series, the compensation capacitor CRAnd diode VD3Diode VD4Are connected in series.
Further, a load resistor RLAre all associated with two polesTube VD1Diode VD2Diode VD3Diode VD4Are connected in series.
A foreign matter detection method for a dynamic wireless charging system of an electric vehicle comprises the following steps:
step S1: calculating the output current I of the inverter circuit when the primary side compensation circuit is in a charging state and no foreign matter exists in the electric automobileAA range value of (d); output current I of inverter circuit in non-charging state when primary side compensation circuit has no foreign matterA *Calculating the phase difference between the output current and the output voltage in the two states;
step S2: calculating the output current I of the inverter circuit when the primary side compensation circuit has foreign matters in the charging state of the electric automobileBA range value of (d); output current I of inverter circuit when foreign matter exists in primary side compensation circuit under non-charging stateB *Calculating the phase difference between the output current and the output voltage in the two states;
step S3: real-time detection of actual current I of inverter circuitCAnd the actual voltage UCAnd the actual current ICAnd the actual voltage UCActual phase difference between
Figure 100002_DEST_PATH_IMAGE001
(ii) a And judging whether the electric automobile is in different states or not, wherein the primary side compensation circuit and the secondary side compensation circuit have different objects.
Further, the mutual inductance M between the transmitting coil and the receiving coil in the charged state in step S1 is varied within a range of
Figure 100002_DEST_PATH_IMAGE002
Said M is1And M2The self inductance of the transmitting coil is L at the upper and lower limits of the mutual inductance change in the stateTInternal resistance of the transmitting coil is RTSelf-inductance of the receiving coil is LRInternal resistance of the receiving coil is RROutput voltage of UAOutput current IAThe calculation process is as follows:
Figure 100002_DEST_PATH_IMAGE003
Figure 100002_DEST_PATH_IMAGE004
wherein:
Figure 100002_DEST_PATH_IMAGE005
is the resonant frequency of the system, Z11、Z12、Z21 、Z22All are intermediate variables, and if there is no imaginary number in the calculation formula, Z11And Z12Is a purely resistive impedance, so that during charging in the foreign-free state, IAContinuously varies, and IAAnd UAPhase difference between
Figure 100002_DEST_PATH_IMAGE006
Is zero;
under the non-charging state, the self-inductance and the internal resistance of the transmitting coil are not changed, and the voltage U is outputA *Output current IA *The calculation process of (2) is as follows:
Figure 100002_DEST_PATH_IMAGE007
Figure 100002_DEST_PATH_IMAGE008
from the above formula, under the condition of no foreign matter and no charging, the output current IA *Is a constant value, Z5Is an intermediate variable and is a purely resistive impedance, i.e. IA *And UA *There is no phase difference therebetween.
Further, in step S2, when the electric vehicle is in the charging state, the mutual inductance M between the transmitting coil and the receiving coil varies within a range of
Figure 100002_DEST_PATH_IMAGE009
Said M is3And M4The self inductance of the transmitting coil is L at the upper and lower limits of the mutual inductance change in the stateTAInternal resistance of the transmitting coil is RTASelf-inductance of the receiving coil is LRAInternal resistance of the receiving coil is RRAOutput current IBThe calculation process is as follows:
Figure 100002_DEST_PATH_IMAGE010
Figure 100002_DEST_PATH_IMAGE011
from the above formula, IBRange of values and IAAre different in the range of Z31、Z32、Z41 、Z42Are intermediate variables whose formula is represented by an imaginary number, i.e. Z31And Z32Not purely resistive impedance, then IBAnd UBThe phase difference exists between the two parts, and the phase difference changes continuously;
when the electric automobile is not in a charging state, the mutual inductance M between the transmitting coil and the receiving coil is zero, and the self-inductance of the transmitting coil is LTBInternal resistance ofR TBOutput current IB *The calculation process is as follows:
Figure 100002_DEST_PATH_IMAGE012
Figure 100002_DEST_PATH_IMAGE013
the formula shows that: z6Is an intermediate variable and not purely resistive impedance, IB *And UB *A fixed phase difference exists between them, and the current IB *Value of (D) and current IBAre not equal in value.
Further, the determination process in step S3 is: if the actual current ICThe value of (1) is continuously changed, and the electric automobile is judged to be in a wireless charging area;
detecting the actual current ICAnd the actual phase difference between the actual current voltage and the variation range of (2)
Figure DEST_PATH_IMAGE014
(ii) a If the actual current ICIs not in the output current IAWithin a range of values of, or actual phase difference
Figure 863075DEST_PATH_IMAGE014
If not, judging that foreign matters exist among the coils, otherwise, judging that no foreign matters exist among the coils;
if the actual current ICIf the value is a fixed value, judging that the electric automobile is not in a wireless charging area;
detecting the actual current ICAnd the actual phase difference between the value of (d) and the actual current voltage
Figure 154379DEST_PATH_IMAGE014
If the actual current ICIs not outputting current IA *Within the error range of a fixed value, or actual phase difference
Figure 155833DEST_PATH_IMAGE014
If not, the foreign matter is judged to exist around the transmitting coil.
The invention has the beneficial effects that:
the invention provides a foreign matter detection method for a dynamic wireless charging system of an electric automobile, which can effectively judge whether foreign matters exist in the wireless charging system or not by detecting the change of an inversion output current and the phase difference between inversion output current and voltage; whether the electric automobile is in a charging area can be determined by detecting whether the inversion output current value continuously changes; only the inversion output current and voltage need to be collected, so that the method is simple and convenient and is easy to realize engineering; the invention does not need the original secondary communication device, has simple structure, easy realization and strong practicability.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic wireless charging system according to the present invention.
Fig. 2 is a flow chart of the foreign object detection method according to the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the invention relates to a dynamic wireless charging foreign matter detection system for an electric vehicle, which is used for dynamic wireless charging of the electric vehicle and comprises a fixed power supply system and a mobile charging system, wherein the mobile charging system is located in a wireless charging area;
the fixed power supply system comprises a direct-current power supply, an inverter circuit and a primary side compensation circuit which are sequentially connected into a loop; the mobile charging system comprises a secondary side compensation circuit, a rectification circuit and a load resistor R which are sequentially connected into a loopL。
The primary side compensation circuit is wirelessly connected with the secondary side compensation circuit, the inverter circuit is electrically connected with the current and voltage sampling circuit and the DSP controller, the current and voltage sampling circuit is used for collecting current and voltage output by the inverter circuit and transmitting the current and voltage to the DSP controller, and the DSP controller is used for judging whether the electric automobile is in a wireless charging area or not according to the change of the current value and judging whether foreign matters exist between the primary side compensation circuit and the secondary side compensation circuit or not according to the change of the voltage value.
The inverter circuit comprises a first parallel circuit and a second parallel circuit, the first parallel circuit and the second parallel circuit are both connected with the direct-current power supply, and the first parallel circuit comprises a switch tube S connected in series1And a switching tube S2The second parallel circuit comprises a switching tube S connected in series3And a switching tube S4。
The primary side compensation circuit comprises compensation inductors L which are sequentially connected in series1Transmitting coil LTAnd a compensation capacitor CTAt the transmitting coil LTAnd a compensation capacitor CTBoth ends of the capacitor are connected in parallel with a compensation capacitor C1The second parallel line and a compensation capacitor CTIn series, the first parallel line and the compensation inductance L1Are connected in series.
The secondary side compensation circuit comprises series compensationInductor L2Receiving coil LRAnd a compensation capacitor CRThe receiving coil LRAnd a compensation capacitor CRBoth ends of the capacitor are connected in parallel with a compensation capacitor C2。
The rectification circuit comprises a diode VD1Diode VD2Diode VD3Diode VD4Filter capacitor C3Said diode VD1Diode VD2Diode VD3Diode VD4Constitute a single-phase bridge type uncontrolled rectifying circuit, the compensation inductor L2And diode VD1Diode VD2In series, the compensation capacitor CRAnd diode VD3Diode VD4Are connected in series; load cell RLAre all connected with diode VD1Diode VD2Diode VD3Diode VD4Are connected in series.
The above-mentioned parameters of the respective elements satisfy the following relationship, wherein
Figure DEST_PATH_IMAGE015
Represents the system resonant frequency:
Figure DEST_PATH_IMAGE016
a foreign matter detection method for a dynamic wireless charging system of an electric vehicle comprises the following steps:
step S1: calculating the output current I of the inverter circuit when the primary side compensation circuit is in a charging state and no foreign matter exists in the electric automobileAA range value; output current I of inverter circuit in non-charging state when primary side compensation circuit has no foreign matterA *And calculating the phase difference between the output current and the output voltage in the two states according to the fixed value.
The variation range of the mutual inductance M between the transmitting coil and the receiving coil in the charged state in step S1 is
Figure DEST_PATH_IMAGE017
Said M is1And M2Up and down changed by mutual inductance in the stateThe self-inductance of the transmitting coil is LTInternal resistance of the transmitting coil is RTSelf-inductance of the receiving coil is LRInternal resistance of the receiving coil is RROutput voltage of UAOutput current IAThe calculation process is as follows:
Figure DEST_PATH_IMAGE018
Figure DEST_PATH_IMAGE019
wherein:
Figure 4666DEST_PATH_IMAGE005
is the resonant frequency of the system, Z11、Z12、Z21 、Z22All are intermediate variables, and if there is no imaginary number in the calculation formula, Z11And Z12Is a purely resistive impedance, so that during charging in the foreign-free state, IAContinuously varies, and IAAnd UAPhase difference between
Figure 407965DEST_PATH_IMAGE006
Is zero.
Under the non-charging state, the self-inductance and the internal resistance of the transmitting coil are not changed, and the voltage U is outputA *Output current IA *The calculation process of (2) is as follows:
Figure DEST_PATH_IMAGE020
Figure DEST_PATH_IMAGE021
from the above formula, under the condition of no foreign matter and no charging, the output current IA *Is a constant value, Z5Is an intermediate variable and is a purely resistive impedance, i.e. IA *And UA *In a middle stageThere is a phase difference.
Step S2: calculating the output current I of the inverter circuit when the primary side compensation circuit has foreign matters in the charging state of the electric automobileBA range value; output current I of inverter circuit when foreign matter exists in primary side compensation circuit under non-charging stateB *Fixed value, the phase difference between the output current and the output voltage is calculated in both states.
In step S2, when the electric vehicle is in the charging state, the variation range of the mutual inductance M between the transmitting coil and the receiving coil is
Figure DEST_PATH_IMAGE022
Said M is3And M4The self inductance of the transmitting coil is L at the upper and lower limits of the mutual inductance change in the stateTAInternal resistance of the transmitting coil is RTASelf-inductance of the receiving coil is LRAInternal resistance of the receiving coil is RRAOutput current IBThe calculation process is as follows:
Figure DEST_PATH_IMAGE023
Figure DEST_PATH_IMAGE024
from the above formula, IBRange of values and IAAre different in the range of Z31、Z32、Z41 、Z42Are intermediate variables whose formula is represented by an imaginary number, i.e. Z31And Z32Not purely resistive impedance, then IBAnd UBThere is a phase difference therebetween, and the phase difference varies continuously.
When the electric automobile is not in a charging state, the mutual inductance M between the transmitting coil and the receiving coil is zero, and the self-inductance of the transmitting coil is LTBInternal resistance ofR TBOutput current IB *The calculation process is as follows:
Figure DEST_PATH_IMAGE025
Figure DEST_PATH_IMAGE026
from the above formula, Z is6Is an intermediate variable and not purely resistive impedance, IB *And UB *A fixed phase difference exists between them, and the current IB *Value of (D) and current IBAre not equal in value.
Step S3: real-time detection of actual current I of inverter circuitCAnd the actual voltage UCAnd the actual current ICAnd the actual voltage UCActual phase difference between
Figure DEST_PATH_IMAGE027
(ii) a And judging whether the electric automobile is in different states or not, wherein the primary side compensation circuit and the secondary side compensation circuit have different objects.
The judgment process is as follows: if the actual current ICThe value of (2) is continuously changed, and the electric automobile is judged to be in a wireless charging area.
Detecting the actual current ICAnd the actual phase difference between the actual current voltage and the variation range of (2)
Figure 994805DEST_PATH_IMAGE027
(ii) a If the actual current ICIs not in the output current IAWithin a range of values of, or actual phase difference
Figure 217975DEST_PATH_IMAGE027
And if not, judging that foreign matters exist between the coils, otherwise, judging that no foreign matters exist between the coils.
If the actual current ICIf the value of (1) is a fixed value, the electric automobile is judged not to be in the wireless charging area.
Detecting the actual current ICAnd the actual phase difference between the value of (d) and the actual current voltage
Figure 938676DEST_PATH_IMAGE027
If the actual current ICIs not outputting current IA *Within the error range of a fixed value, or actual phase difference
Figure 196482DEST_PATH_IMAGE027
If not, the foreign matter is judged to exist around the transmitting coil.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.

Claims (4)

1. A foreign matter detection method for a dynamic wireless charging system of an electric vehicle is characterized by comprising the following steps:
step S1: calculating the output current I of the inverter circuit when the primary side compensation circuit is in a charging state and no foreign matter exists in the electric automobileAA range value of (d); output current I of inverter circuit in non-charging state when primary side compensation circuit has no foreign matterA *Calculating the phase difference between the output current and the output voltage in the two states;
the inverter circuit comprises a first parallel circuit and a second parallel circuit, the first parallel circuit and the second parallel circuit are both connected with the direct-current power supply, and the first parallel circuit comprises switch tubes S connected in series1And a switching tube S2The second parallel circuit comprises a switching tube S connected in series3And a switching tube S4；
The primary side compensation circuit comprises compensation inductors L which are sequentially connected in series1Transmitting coil LTAnd a compensation capacitor CTAt the transmitting coil LTAnd a compensation capacitor CTBoth ends of the capacitor are connected in parallel with a compensation capacitor C1The second parallel line and a compensation capacitor CTIn series, the first parallel line and the compensation inductance L1Are connected in series;
step S2:calculating the output current I of the inverter circuit when the primary side compensation circuit has foreign matters in the charging state of the electric automobileBA range value; output current I of inverter circuit when foreign matter exists in primary side compensation circuit under non-charging stateB *Calculating the phase difference between the output current and the output voltage in the two states;
step S3: real-time detection of actual current I of inverter circuitCAnd the actual voltage UCAnd the actual current ICAnd the actual voltage UCActual phase difference between
Figure DEST_PATH_IMAGE001
(ii) a Judging whether the electric automobile is in different states or not, wherein the primary side compensation circuit and the secondary side compensation circuit have foreign objects;
the secondary side compensation circuit is sequentially connected with the rectifying circuit and the load resistor RLElectrically connecting;
the secondary side compensation circuit comprises compensation inductors L which are sequentially connected in series2Receiving coil LRAnd a compensation capacitor CRThe receiving coil LRAnd a compensation capacitor CRBoth ends of the capacitor are connected in parallel with a compensation capacitor C2；
The rectification circuit comprises a diode VD1Diode VD2Diode VD3Diode VD4Filter capacitor C3Said diode VD1Diode VD2Diode VD3Diode VD4Constitute a single-phase bridge type uncontrolled rectifying circuit, the compensation inductor L2And diode VD1Diode VD2In series, the compensation capacitor CRAnd diode VD3Diode VD4Are connected in series;
the load resistor RLAre all connected with diode VD1Diode VD2Diode VD3Diode VD4Are connected in series.
2. The foreign matter detection method of the dynamic wireless charging system of the electric automobile according to claim 1, wherein the method is characterized in thatIn the following steps: the variation range of the mutual inductance M between the transmitting coil and the receiving coil in the charging state in the step S1 is
Figure DEST_PATH_IMAGE002
Said M is1And M2The self inductance of the transmitting coil is L at the upper and lower limits of the mutual inductance change in the stateTInternal resistance of the transmitting coil is RTSelf-inductance of the receiving coil is LRInternal resistance of the receiving coil is RROutput voltage of UAOutput current IAThe calculation process is as follows:
Figure DEST_PATH_IMAGE003
Figure DEST_PATH_IMAGE004
wherein:
Figure DEST_PATH_IMAGE005
is the resonant frequency of the system, Z11、Z12、Z21 、Z22All are intermediate variables, and if there is no imaginary number in the calculation formula, Z11And Z12Is a purely resistive impedance, so that during charging in the foreign-free state, IAContinuously varies, and IAAnd UAPhase difference between
Figure 850628DEST_PATH_IMAGE001
Is zero;
under the non-charging state, the self-inductance and the internal resistance of the transmitting coil are not changed, and the voltage U is outputA *Output current IA *The calculation process of (2) is as follows:
Figure DEST_PATH_IMAGE006
Figure DEST_PATH_IMAGE007
from the above formula, under the condition of no foreign matter and no charging, the output current IA *Is a constant value, Z5Is an intermediate variable and is a purely resistive impedance, i.e. IA *And UA *There is no phase difference therebetween.
3. The method for detecting the foreign object in the dynamic wireless charging system of the electric vehicle as claimed in claim 2, wherein in the step S2, when the electric vehicle is in the charging state, the variation range of the mutual inductance M between the transmitting coil and the receiving coil is set as
Figure DEST_PATH_IMAGE008
Said M is3And M4The self inductance of the transmitting coil is L at the upper and lower limits of the mutual inductance change in the stateTAInternal resistance of the transmitting coil is RTASelf-inductance of the receiving coil is LRAInternal resistance of the receiving coil is RRAOutput current IBThe calculation process is as follows:
Figure DEST_PATH_IMAGE009
Figure DEST_PATH_IMAGE010
from the above formula, IBRange of values and IAAre different in the range of Z31、Z32、Z41 、Z42Are intermediate variables whose formula is represented by an imaginary number, i.e. Z31And Z32Not purely resistive impedance, then IBAnd UBThe phase difference exists between the two parts, and the phase difference changes continuously;
transmitting coil and receiving coil of electric vehicle in non-charging stateMutual inductance M between the two coils is zero, and self-inductance of the transmitting coil is LTBInternal resistance of RTBOutput current IB *The calculation process is as follows:
Figure DEST_PATH_IMAGE011
Figure DEST_PATH_IMAGE012
from the above formula, Z is6Is an intermediate variable and not purely resistive impedance, IB *And UB *A fixed phase difference exists between them, and the current IB *Value of (D) and current IBAre not equal in value.
4. The foreign matter detection method of the dynamic wireless charging system of the electric automobile according to claim 2 or 3, characterized in that: the determination process in step S3 is: if the actual current ICThe value of (1) is continuously changed, and the electric automobile is judged to be in a wireless charging area;
detecting the actual current ICAnd the actual phase difference between the actual current voltage and the variation range of (2)
Figure DEST_PATH_IMAGE013
(ii) a If the actual current ICIs not in the output current IAWithin a range of values of, or actual phase difference
Figure 95665DEST_PATH_IMAGE013
If not, judging that foreign matters exist among the coils, otherwise, judging that no foreign matters exist among the coils;
if the actual current ICIf the value is a fixed value, judging that the electric automobile is not in a wireless charging area;
detecting the actual current ICAnd the actual phase difference between the value of (d) and the actual current voltage
Figure 609823DEST_PATH_IMAGE013
If the actual current ICIs not outputting current IA *Within the error range of a fixed value, or actual phase difference
Figure 994580DEST_PATH_IMAGE013
If not, the foreign matter is judged to exist around the transmitting coil.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN106300691A (en) * 2016-08-08 2017-01-04 西南交通大学 The detection device of metal foreign body of a kind of inductive electric energy transmission system and detection method thereof
CN107005094A (en) * 2014-11-21 2017-08-01 Lg伊诺特有限公司 The foreign matter detecting method of wireless power dispensing device and wireless power dispensing device
CN108365654A (en) * 2018-03-16 2018-08-03 东南大学 A kind of wireless charger suitable for arbitrary lithium battery
CN109391047A (en) * 2017-08-10 2019-02-26 现代自动车株式会社 Foreign matter detecting method, wireless power transmission and control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107005094A (en) * 2014-11-21 2017-08-01 Lg伊诺特有限公司 The foreign matter detecting method of wireless power dispensing device and wireless power dispensing device
CN106300691A (en) * 2016-08-08 2017-01-04 西南交通大学 The detection device of metal foreign body of a kind of inductive electric energy transmission system and detection method thereof
CN109391047A (en) * 2017-08-10 2019-02-26 现代自动车株式会社 Foreign matter detecting method, wireless power transmission and control device
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