CN110450656A - A kind of electric car wireless charging closed-loop control system based on differential inductance - Google Patents
A kind of electric car wireless charging closed-loop control system based on differential inductance Download PDFInfo
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- CN110450656A CN110450656A CN201910610094.7A CN201910610094A CN110450656A CN 110450656 A CN110450656 A CN 110450656A CN 201910610094 A CN201910610094 A CN 201910610094A CN 110450656 A CN110450656 A CN 110450656A
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- 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 electric car wireless charging closed-loop control system based on differential inductance that the invention discloses a kind of, primary side unit and vehicle-mounted secondary side unit including being placed in ground, primary side unit includes inverter circuit, compensation circuit, primary side resonant capacitance, primary side power coil, differential inductance coil and MCU；The secondary power coil when unit includes secondary, secondary side resonant capacitance and rectification circuit.Wherein, the electric current phasor of non-contact measurement pair side power coil may be implemented in differential inductance coil, and shields the interference of primary side bring；MCU is sampled and is calculated to differential inductance coil output voltage and primary side power current, feedback quantity as closed-loop control is compared with specified rate, control signal is generated by pi regulator, control the duty cycle of switching of compensation circuit, and then it realizes and changes compensation circuit to the reflected umpedance of primary side, when loading variation, adjustment primary side compensation network realizes impedance matching and self-tuning, maintains the maximum power and efficiency of higher wireless charging.
Description
Technical field
The invention belongs to electric car wireless charging technical fields, and in particular to a kind of electric car based on differential inductance
Wireless charging closed-loop control system.
Background technique
With the continuous aggravation of fossil energy crisis and problem of environmental pollution, electric car gradually substitutes conventional fuel oil car
Trend is also further obvious, however several factors limit the further application of electric car, such as battery volume is big, price is high,
Cruise duration is short etc..
The plug-in type charging modes that electric car generallys use at present, but there is contact mouth aging and electric spark easily occur in it,
Power transmission cable length and towing hinder to limit the flexibility of mobile device, and transmission device is resistance under the adverse circumstances such as high temperature and pressure
It is poor by property, the problems such as maintenance cost is high.Electric car wants large-scale promotion, needs using a kind of new charging modes；It compares
In traditional plug-in type charging system, non-contact power transmission system is not necessarily to the connection of physical circuit, tradition can be overcome to fill
The deficiencies of method for electrically bring is vulnerable to shocking by electricity, being easily affected by environment is realized electric energy green, is efficiently and safely transmitted.
The electric car wireless charging technology of current practice predominantly inductively type, i.e., it is former using electromagnetic induction
Reason carries out energy conduction by induced electromotive force that magnetic field generates on coupling coil；General primary side power coil is installed on
Energy is transmitted on ground, and secondary side power coil is installed on electric car bottom reception energy.In practical applications, former secondary side function is needed
Rate coil and compensation network work near resonance point, and to realize impedance matching, to reach power and efficiency of transmission
It improves.However, different vehicles to be charged and different stop positions, will cause different secondary inductance and circuit parameter and
Bring the coupling condition of different former secondary coils, therefore the mutual induction amount on former secondary side is continually changing, this requires be located at
The resonance compensation circuit of primary and secondary side needs to provide different parameters, to adjust circuit parameter in real time circuit is worked always
In resonant state, this problem brings technical challenge to the popularization of electric car wireless charging technology and business application.
The Chinese patent of Publication No. CN109256844A proposes a kind of electric car wireless charging circuit and control of charging
Method processed, this method all use the full-bridge circuit of wholly-controled device composition in the sending side of wireless charging and receiving side, and
By so that the impedance of convertor circuit is adjustable while former secondary, and using former secondary while being respectively set a set of control system
UWB location technology is not too large come the offset of automobile coil when ensureing charging；Such scheme is needed using two sets of controls
System, and ensure two systems efficient communication with it is synchronous, it is also necessary to add UWB positioning system, increase the complexity of control
The cost of degree and hardware, and the complementary capabilities of situation detuning for former secondary circuit are limited.
Summary of the invention
In view of above-mentioned, the electric car wireless charging closed-loop control system based on differential inductance that the present invention provides a kind of,
Which employs the methods of dynamic compensation, realize by closed-loop control and adjust in real time, to realize impedance matching.
A kind of electric car wireless charging closed-loop control system based on differential inductance, the primary side list including being placed in ground
First and vehicle-mounted secondary side unit；
The primary side unit include inverter circuit, compensation circuit, primary side resonant capacitance, primary side power coil, mutual inductor,
Differential inductance coil, AD sample circuit and MCU；Wherein, the direct current of inverter circuit flanks DC source, and the one of primary side power coil
One end that end exchanges side with inverter circuit is connected, and the other end of primary side power coil is connected with one end of primary side resonant capacitance, mends
Circuit is repaid to be of coupled connections by mutual inductor between the other end of the other end and primary side resonant capacitance that exchange side in inverter circuit,
Differential inductance coil is coupled with AD sample circuit by magnetic interface, MCU and AD sample circuit, compensation circuit and inverter circuit phase
Even；
The secondary power coil when unit includes secondary, secondary side resonant capacitance and rectification circuit, secondary side power coil and poor
Inductance coil and primary side power coil is divided to intercouple；One end phase of secondary one end in power coil and resonant capacitance when pair
Even, one end that the other end of secondary side resonant capacitance exchanges side with rectification circuit is connected, the other end of secondary side power coil and rectification
The other end of circuit AC side is connected, and the DC side of rectification circuit is connect with on-vehicle battery.
Further, the inverter circuit is controlled by MCU generates high frequency sinusoidal electric current, which passes through mutual inductance
Coil is powered to primary side power coil, so that resonance occurs for primary side resonant capacitance and primary side power coil, and in primary side power line
The high-frequency current of fixed frequency is generated on circle, and then causes the induction of secondary side power coil generation identical frequency by electromagnetic induction
Electric current, the induced current are charging on-vehicle battery after rectification circuit.
Further, the differential inductance coil is by two receiving coil l1And l2Composition, receiving coil l1And l2Together
Name end is connected with each other, receiving coil l1And l2Another Same Name of Ends as differential inductance coil output port pass through magnetic interface coupling
The form of conjunction is connected to AD sample circuit；In the case where removing secondary side power coil, receiving coil l1With primary side power coil
Mutual inductance be Mp1, receiving coil l2Mutual inductance with primary side power coil is Mp2, and Mp1=Mp2So that primary side power coil is receiving
Coil l1And l2The induced voltage of upper generation is cancelled out each other at differential inductance coil output mouth.
Further, the magnetic interface is realized using coupling inductance or high frequency transformer, and the compensation circuit uses half-bridge
Or full-bridge circuit topological structure.
Further, the secondary side power coil is by coupling so that differential inductance coil generates output voltage, the output
Voltage phasor UsoCalculation expression it is as follows:
Uso=I2·jω(Mr1-Mr2)
Wherein: I1For the electric current phasor on primary side power coil after energization, I2For the induced current phase on secondary side power coil
Amount, ω are the electric current angular frequency after being powered on primary side power coil, and j is imaginary unit, and M is primary side power coil and secondary side power
Mutual inductance between coil, Mr1And Mr2Respectively receiving coil l1And l2Mutual inductance and M between secondary side power coilr1≠Mr2, RZ
And LZRespectively secondary side power coil even loads the resistance of (equivalent load including on-vehicle battery and secondary side rectification circuit)
Anti- and induction reactance.
Preferably, it is parallel with resonant capacitance on the output port of the differential inductance coil, the capacitance of the resonant capacitance
Cr=1/ ω2Ls, LsFor the equivalent inductance and L of differential received coils=Ls1+Ls2-2Ms12；Wherein: Ls1And Ls2Respectively receive
Coil l1And l2Inductance value, Ms12For receiving coil l1With l2Mutual inductance.Parallel resonance capacitor can be improved differential inductance coil
The amplitude of output voltage signal.
Further, the MCU obtains the output voltage of differential inductance coil by AD sample circuit, while acquiring primary side
Electric current on power coil calculates secondary impedance modulus value according to differential inductance coil output voltage, and according to differential inductance line
The phase difference of circle output voltage and primary side power coil electric current calculates the impedance ratio of secondary side load in real time, and then controls compensation electricity
The duty ratio of switching device in road changes equivalent impedance of the compensation circuit in primary side unit, so that primary side input impedance is adjusted,
It realizes former secondary impedance matching, realizes that power maximizes transmission.
Differential inductance coil can shield the interference of primary side power coil in present system, to the electricity of secondary side power coil
It flows phasor and realizes non-contact measurement；MCU reads the output voltage values and primary side function of differential inductance coil by AD sample circuit
The current value of rate coil can calculate the variation hundred of secondary impedance modulus value according to the variation of differential inductance coil output voltage amplitude
Divide ratio, the phase difference by calculating differential inductance coil output voltage and primary current can calculate the resistance of secondary side load in real time
Anti- ratio.It changes in the electric car vehicle ontology being electrically charged or when the change in location of same vehicle, wireless charging system
The impedance of load can change, so that former secondary impedance mismatches, charge power and efficiency are affected and substantially reduce；This
When, MCU passes through the output voltage of differential inductance coil detected and the electric current of primary side power coil calculates secondary impedance mould
The variation of value and impedance ratio controls the change in duty cycle of the switching device of primary side compensation circuit, changes primary side input impedance, realizes
Primary and secondary side impedance matching realizes that power or efficiency maximize transmission.
The beneficial technical effect of the present invention lies in:
1. system detects secondary current phasor value using differential inductance, the influence of primary side power coil can be shielded, is improved
The accuracy of feedback signal.
2. system uses phase difference (i.e. impedance ratio) and impedance magnitude for control amount, using the bridge circuit of compensation network as
Control action object can control each switching device of compensation network bridge circuit by MCU when secondary side loads and changes
Duty ratio, change equivalent impedance of the compensation circuit in primary side power circuit, to adjust input impedance, loaded with secondary side real
Existing impedance matching, reaches power or efficiency maximumlly controls target.
Detailed description of the invention
Fig. 1 is the schematic view of the mounting position of differential inductance coil.
Fig. 2 is the coupled relation schematic diagram of differential inductance coil and former secondary side power coil.
Fig. 3 is the coupling interface schematic diagram of differential inductance coil and AD sample circuit.
Fig. 4 is the structural schematic diagram of closed-loop control system of the present invention.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment to the present invention carry out specifically
It is bright.
As shown in figure 4, the present invention is based on the electric car wireless charging closed-loop control systems of differential inductance, including it is placed in
The primary side unit on ground and vehicle-mounted secondary side unit, primary side unit include primary side inverter circuit, compensation circuit, primary side resonant capacitance
C1, primary side power coil, differential inductance coil, AD sample circuit and MCU, differential inductance coil and AD sample circuit pass through magnetic
Interface coupling, compensation circuit are coupled with primary side power coil inlet wire by magnetic interface；Secondary power coil, pair when unit includes secondary
Side resonant capacitance C2 and secondary side rectification circuit, secondary side power coil and the differential inductance coil and primary side power coil for being located at primary side
Magnetic coupling.
Primary side inverter circuit generates high frequency sinusoidal electric current, supplies after the inductance of compensation circuit coupling to primary side power coil
Electricity, primary side resonant capacitance C1 and primary side power coil resonance at the operating frequencies, generated on primary side power coil fixed frequency,
The biggish high-frequency current of amplitude, and cause secondary side power coil to generate the high frequency induction current of identical frequency by electromagnetic induction,
To charge for electric car.
As shown in Fig. 2, differential inductance coil is by receiving coil l1And l2Two parts are constituted, receiving coil l1And l2One group
Same Name of Ends is connected with each other, and another group of Same Name of Ends is as output port；It is assumed that primary side power coil and receiving coil l1Between it is mutual
Sense is Mp1, primary side power coil and receiving coil l2Between mutual inductance be Mp2, receiving coil l1With receiving coil l2Based on primary side
The installation of power coil mirror position, as shown in Figure 1.After removing tested secondary side power coil, Mp1With Mp2It is equal therefore former
Side power coil is in receiving coil l1With receiving coil l2On induced electromotive force is equal in magnitude, opposite in phase, at output port
It cancels out each other, ensure that primary side power coil does not have any influence to the output voltage of differential inductance.This modes of emplacement is simultaneously
It ensure that secondary side power coil and receiving coil l1And l2Between mutual inductance Mr1And Mr2Unequal, the output voltage of differential inductance can
To reflect the phase information of secondary side power coil electric current, the output voltage phase of differential inductance and former secondary side power coil electric current
The relationship of phase is as follows:
Wherein:The respectively phase of primary current, secondary current and differential inductance output voltage, R, X
For the equivalent resistance and equivalent reactance of secondary loop；It is detectingWithLater, the resistance of secondary impedance can be calculated
Anti- ratio.
As shown in figure 3, be connected after differential inductance coil output mouth parallel resonance capacitor with coupling coil primary side, coupling line
It encloses secondary side and meets AD sample circuit, the capacitance C of the resonant capacitancer=1/ ω2Ls, LsFor the equivalent inductance and L of differential received coils
=Ls1+Ls2-2Ms12；Wherein: Ls1And Ls2Respectively receiving coil l1And l2Inductance value, Ms12For receiving coil l1With l2It is mutual
Sense, parallel resonance capacitor can be improved the amplitude of differential inductance coil output voltage signal.
The series loop that differential inductance coil, resonant capacitance, coupling coil primary side are constituted amplifies differential inductance by resonance
The voltage signal of coil output, is coupled to behind secondary side by AD sampling circuit samples, output voltage phasor UsoIt is as follows:
Uso=I2·jω(Mr1-Mr2)
Wherein: I1For the electric current phasor on primary side power coil after energization, I2For the induced current phase on secondary side power coil
Amount, ω are the electric current angular frequency after being powered on primary side power coil, and j is imaginary unit, and M is primary side power coil and secondary side power
Mutual inductance between coil, Mr1And Mr2Respectively receiving coil l1And l2Mutual inductance and M between secondary side power coilr1≠Mr2, RZ
And LZThe impedance and induction reactance that respectively secondary side power coil even loads.
The given reference value of closed-loop control system of the present invention is the phase angle difference of a certain fixation, and feedback quantity is real-time secondary side
The phase angle difference (impedance ratio of the secondary side equivalent impedance after being included in primary side reflected umpedance) of loop voltage and electric current, given value with
The difference of feedback quantity passes through the effect of pi regulator, the generation pwm signal compared with carrier wave, the generation of pi regulator and pwm signal
It is realized by MCU software programming.Switching device of the pwm signal by isolation and driving circuit control bridge circuit, so that bridge-type
LC network after circuit changes in the duty ratio that each switch periods access, to change the equivalent resistance of primary side compensation network
Anti- modulus value and phase angle, has adjusted the equivalent impedance of primary and secondary side, so as to be restored to resonance point attached for the equivalent LC value on former pair side
Closely, the function of tuning automatically is realized, to improve transimission power and efficiency of transmission.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (7)
1. a kind of electric car wireless charging closed-loop control system based on differential inductance, the primary side unit including being placed in ground
With vehicle-mounted secondary side unit；It is characterized by:
The primary side unit includes inverter circuit, compensation circuit, primary side resonant capacitance, primary side power coil, mutual inductor, difference
Inductance coil, AD sample circuit and MCU；Wherein, the direct current of inverter circuit flanks DC source, one end of primary side power coil with
One end that inverter circuit exchanges side is connected, and the other end of primary side power coil is connected with one end of primary side resonant capacitance, compensation electricity
Road is of coupled connections between the other end of the other end and primary side resonant capacitance that exchange side in inverter circuit by mutual inductor, difference
Inductance coil is coupled with AD sample circuit by magnetic interface, and MCU is connected with AD sample circuit, compensation circuit and inverter circuit；
The secondary power coil when unit includes secondary, secondary side resonant capacitance and rectification circuit, secondary side power coil and differential electrical
Sense coil and primary side power coil intercouple；Secondary one end in power coil is connected with one end of resonant capacitance when pair, secondary
One end that the other end of side resonant capacitance exchanges side with rectification circuit is connected, and the other end and rectification circuit of secondary side power coil are handed over
The other end for flowing side is connected, and the DC side of rectification circuit is connect with on-vehicle battery.
2. electric car wireless charging closed-loop control system according to claim 1, it is characterised in that: the inverter circuit
It is controlled by MCU and generates high frequency sinusoidal electric current, which powers by mutual inductor to primary side power coil, so that former
Resonance occurs for side resonant capacitance and primary side power coil, and the high-frequency current of fixed frequency is generated on primary side power coil, into
And causing secondary side power coil to generate the induced current of identical frequency by electromagnetic induction, the induced current is after rectification circuit
For charging on-vehicle battery.
3. electric car wireless charging closed-loop control system according to claim 1, it is characterised in that: the differential inductance
Coil is by two receiving coil l1And l2Composition, receiving coil l1And l2A Same Name of Ends be connected with each other, receiving coil l1And l2's
Another Same Name of Ends is connected to AD sample circuit by way of magnetic interface couples as the output port of differential inductance coil；It is moving
In the case where secondary side power coil, receiving coil l1Mutual inductance with primary side power coil is Mp1, receiving coil l2With primary side function
The mutual inductance of rate coil is Mp2, and Mp1=Mp2So that primary side power coil is in receiving coil l1And l2The induced voltage of upper generation is in difference
Divide at inductance coil output port and cancels out each other.
4. electric car wireless charging closed-loop control system according to claim 1, it is characterised in that: the magnetic interface is adopted
It is realized with coupling inductance or high frequency transformer, the compensation circuit uses half-bridge or full-bridge circuit topological structure.
5. electric car wireless charging closed-loop control system according to claim 3, it is characterised in that: pair side power
Coil is by coupling so that differential inductance coil generates output voltage, output voltage phasor UsoCalculation expression it is as follows:
Uso=I2·jω(Mr1-Mr2)
Wherein: I1For the electric current phasor on primary side power coil after energization, I2For the induced current phasor on secondary side power coil,
ω is the electric current angular frequency after being powered on primary side power coil, and j is imaginary unit, and M is primary side power coil and secondary side power line
Mutual inductance between circle, Mr1And Mr2Respectively receiving coil l1And l2Mutual inductance and M between secondary side power coilr1≠Mr2, RZWith
LZThe impedance and induction reactance that respectively secondary side power coil even loads.
6. electric car wireless charging closed-loop control system according to claim 3, it is characterised in that: the differential inductance
It is parallel with resonant capacitance on the output port of coil, the capacitance C of the resonant capacitancer=1/ ω2Ls, LsFor differential received coil
Equivalent inductance and Ls=Ls1+Ls2-2Ms12；Wherein: Ls1And Ls2Respectively receiving coil l1And l2Inductance value, Ms12To receive
Coil l1With l2Mutual inductance.
7. electric car wireless charging closed-loop control system according to claim 1, it is characterised in that: the MCU passes through
AD sample circuit obtains the output voltage of differential inductance coil, while acquiring the electric current on primary side power coil, according to differential electrical
Sense coil output voltage calculates secondary impedance modulus value, and according to differential inductance coil output voltage and primary side power coil electric current
Phase difference calculate the impedance ratio of secondary side load in real time, and then control the duty ratio of switching device in compensation circuit, change and mend
Equivalent impedance of the circuit in primary side unit is repaid, to adjust primary side input impedance, former secondary impedance matching is realized, realizes power
Maximize transmission.
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| CN201910610094.7A CN110450656B (en) | 2019-07-08 | 2019-07-08 | Electric automobile wireless charging closed-loop control system based on differential inductance |
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| CN201910610094.7A CN110450656B (en) | 2019-07-08 | 2019-07-08 | Electric automobile wireless charging closed-loop control system based on differential inductance |
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