CN107276390A - The electromagnetic interference prediction circuit and method of double LCC resonance compensations wireless charging systems - Google Patents

The electromagnetic interference prediction circuit and method of double LCC resonance compensations wireless charging systems Download PDF

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Publication number
CN107276390A
CN107276390A CN201710587668.4A CN201710587668A CN107276390A CN 107276390 A CN107276390 A CN 107276390A CN 201710587668 A CN201710587668 A CN 201710587668A CN 107276390 A CN107276390 A CN 107276390A
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mrow
electric capacity
diode
resonance coil
resonance
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肖天鸾
陈文洁
祁鹤媛
沙意林
赵子峰
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Xian Jiaotong University
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Xian Jiaotong University
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    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)

Abstract

The invention belongs to power electronics Research on Electromagnetic Interference field, disclose the electromagnetic interference prediction circuit and method of the wireless charging system of a kind of pair of LCC resonance compensation, pass through the associated arguments of circuit system of the simulation calculation comprising high-frequency parameter, extract the interference of outlet side common mode and differential mode and analyzed, obtain system electromagnetic interference predicted value.Systematic parameter can be subsequently adjusted based on predicted value until meeting target.

Description

The electromagnetic interference prediction circuit and method of double LCC resonance compensations wireless charging systems
Technical field
The invention belongs to power electronics electromagnetic interference technical field, and in particular to a kind of pair of LCC resonance compensation wireless charging The electromagnetic interference prediction circuit and method of system.
Background technology
As energy and environment problem is increasingly serious, wireless charging system with it safely, conveniently, applicable situation extensively etc. it is excellent Gesture is attracted attention.Therefore, wireless charging system is widely used in the charging of electric automobile, implantable medical devices Power supply and other consumer electronics products in, such as electric toothbrush, mobile phone.In charging process, what the system was produced Electromagnetic interference problem also result in increasing concern.
On the electromagnetic interference problem of wireless charging system, domestic and foreign scholars have carried out the research of many related fields. Invention disclosed patent is such as：《Method and apparatus for controlling the interference in wireless power transmission system》A kind of power is invented The interference control method of transmission unit (PTU), it may be determined that whether PTU is in interference environment, final control neighbouring PTU and work( The messaging parameter of any one or two in rate receiving unit (PRU)；《Harmonic wave abatement for wireless power transmission system is set It is standby》A kind of device for the harmonic wave abatement device being coupling between switching network and transmitter coils is devised, this harmonic wave abatement is set It is standby to be configured as decaying at least one frequency component；《Being designed as in vehicle reduces the wireless of electromagnetic interference Battery charger》There is provided a kind of wireless battery charging device in vehicle for reduction electromagnetic interference, for reducing By the electrostatic protection of the radiation-induced electromagnetic interference of wireless battery charger.
The method referred in such scheme carries out electromagnetic interference suppression, abatement, control after the completion of being set up mainly for system And shielding, it is impossible to adjustment of being modified in itself to system, it is impossible to be adjusted when designing device to systematic parameter.
The content of the invention
It is that follow-up system is set to intuitively understand pair electromagnetic interference situation of the wireless charging system of LCC resonance compensations Meter and raising power efficiency make guidance, and the purpose of the present invention is to propose to a kind of the wireless of double LCC resonance compensations based on Saber The electromagnetic interference prediction circuit and method of charging system, before system foundation, set up system electromagnetic interference prediction circuit and go forward side by side Row prediction, intuitively reflects the order of severity of system electromagnetic interference, and to systematic parameter and model before test platform is built Optimize, this Forecasting Methodology more effectively economizes on resources, reduce its electromagnetic interference, and devise the side for carrying out electromagnetic interference prediction Method.
To achieve the above object, the technical solution adopted by the present invention is, the electromagnetism of double LCC resonance compensations wireless charging systems Interference prediction circuit, input voltage connects the emitting side resonant network in resonant network, receiving side by input side inverter circuit Resonant network is connected with outlet side rectification circuit, through capacitor filtering, exports DC voltage, and the input side inverter circuit is half-bridge Inverter circuit, outlet side rectification circuit is full bridge rectifier.
Including resonance coil L1With resonance coil L2, resonance coil L1First end and resonance coil L2First end and Resonance coil L1The second end and resonance coil L2The second end be Same Name of Ends, resonance coil L1First end pass through electric capacity Cs1With Resonance coil L2First end connection, resonance coil L1The second end pass through electric capacity Cs2With resonance coil L2The second end connection；
Resonance coil L1And Lf1And electric capacity C1And Cf1Constitute emitting side resonant network, resonance coil L1With electric capacity C1, resistance R1With electric capacity C after series connectionf1Parallel connection, then with resonance coil Lf1Series connection, resonance coil Lf1It is connected with half-bridge inversion circuit；Resonance Coil L2And Lf2And electric capacity C2And Cf2Constitute receiving side resonant network, resonance coil L2With electric capacity C2, resistance R2With electricity after series connection Hold Cf2Parallel connection, then with resonance coil Lf2Series connection, resonance coil Lf2It is connected to full bridge rectifier input.
Also include direct voltage source DC, switching tube S1Drain electrode be connected to direct voltage source DC positive pole, switching tube S2Source Pole is connected to direct voltage source DC negative pole, switching tube S1With switching tube S2Constitute half-bridge inversion circuit, and switching tube S1And S2's Electric capacity, switching tube S are connected between source electrode and drain electrode2Source electrode pass through electric capacity CpGround connection.
Also include diode D1、D2、D3And D4The full bridge rectifier of composition, wherein, diode D1With diode D2It is defeated Go out end connection, diode D3With diode D4Input connection, diode D1Input and diode D3Output end connect Connect, diode D2Input and diode D4Output end connection；Resonance coil L2First end pass sequentially through electric capacity C2It is harmonious Shake coil Lf2It is connected to diode D1Input, resonance coil L2The second end pass through resistance R2It is connected to diode D2It is defeated Enter end, diode D2Input also pass through electric capacity Cf2It is connected to electric capacity C2With resonance coil Lf2Between.
Diode D1、D2、D3And D4Input and output end between be connected to electric capacity；Diode D3Output end lead to Cross electric capacity CtGround connection, diode D4Output end pass through electric capacity CrGround connection；Diode D2Output end pass through electric capacity C3It is connected to two Pole pipe D4Input, electric capacity C3Two ends be parallel with electric capacity C4, it is used as the resistance R of loadLIt is connected in parallel on electric capacity C3Two ends.
Present invention also offers the electromagnetic interference Forecasting Methodology of a kind of pair of LCC resonance compensation wireless charging system, including with Lower step：
Step 1), determine systematic parameter, including input voltage U, resonant frequency f, emitting side resonant inductance L1, Lf1With resonance Electric capacity C1、Cf1Receiving side resonant inductance L2, Lf2With resonant capacitance C2、Cf2, coil coefficient of coup k, load RL；
Step 2), set up system electromagnetic interference model, add-on system parasitic parameter；
Step 3), outlet side common mode, the waveform of DM EMI signal under simulation calculation different working condition；
The step 1) in, it is first determined input voltage U and working frequency f, formula is met according to working frequency selection (1a)~(1d) resonant network capacitor and inductor parameter：
jωLf1=1/j ω Cf1 (1a)
jωLf2=1/j ω Cf2 (1b)
jωL1-1/jωC1=1/j ω Cf1 (1c)
jωL2-1/jωC2=1/j ω Cf2 (1d)
Wherein, the π f of ω=2, load RLSystem output power and electromagnetic interference can be influenceed, variable, perfect condition is also considered as Under, the transimission power of resonant network is expressed as follows：
Wherein, UinAnd UoutThe virtual value of the input and output voltage of resonant network, UoutBy load effect, M is resonance coil L1、L2Between mutual inductance；Coil coefficient of coup k is determined by coil distance, relative position, influences the transimission power of system, in the present invention It is regarded as variable processing；
Electric capacity CpIt is two switch mosfet pipe S1、S2Equivalent parasitic capacitance over the ground, electric capacity Cs1And Cs2It is system transmitting Parasitic capacitance between coil and receiving coil, electric capacity Ct、CrIt is each device in the parasitic capacitance over the ground of diode, the circuit Parasitic parameter adding method is as follows：
Electric capacity Cs1、Cs2、Cp、Ct、CrCapacitance obtained according to capacity plate antenna calculation formula (4)：
Wherein, S is the facing area of capacitor two-plate, and d is the distance between capacitor two-plate, and ε is dielectric constant, k1For dielectric constant.
When coil coefficient of coup k increases, coil distance is larger compared near, relative area, Cs1And Cs2Increase therewith, Cs1With Cs2Capacitance obtained according to capacity plate antenna calculation formula (4).
Relative area between ejecting plate, appropriate estimation plate spacing, according to formula are obtained by searching device handbook switch mosfet pipe (4) its equivalent parasitic capacitance C over the ground can be calculatedpValue, can similarly calculate the parasitic capacitance C over the ground of diodet、CrValue.
Compared with prior art, the present invention at least has the advantages that, the present invention is by setting up double LCC resonance compensations Wireless charging system electromagnetic interference precircuit, suppression common mode electromagnetic interference of the system under different working condition is predicted point Analysis, understands its variation tendency, analysis is predicted to differential mode electromagnetic interference of the system under different working condition, understands its change Trend, when carrying out system design, notes reasonable selection parameter, electromagnetic interference is suppressed.
Brief description of the drawings
Fig. 1 is system electromagnetic interference precircuit of the invention.
Fig. 2 changes (b) with the coefficient of coup for outlet side common mode disturbances (a) under different working condition of the present invention and become with load Change.
Fig. 3 changes (b) with the coefficient of coup for outlet side DM EMI (a) under different working condition of the present invention and become with load Change.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Present system circuit is as shown in figure 1, input voltage is direct current, and input side inverter circuit selection semi-bridge inversion is electric Road, energy is transmitted through resonant network, and outlet side rectification circuit selects full bridge rectifier, and through capacitor filtering, output voltage is straight Stream.L1、Lf1、C1、Cf1Constitute emitting side resonant network, L2、Lf2、C2、Cf2Constitute receiving side resonant network, R1、R2It is equivalent for coil Series resistance, k is two resonance coil L1、L2Between the coefficient of coup, RLFor load.
The present invention includes resonance coil L1With resonance coil L2, resonance coil L1First end and resonance coil L2First End and resonance coil L1The second end and resonance coil L2The second end be Same Name of Ends, resonance coil L1First end pass through electricity Hold Cs1With resonance coil L2First end connection, resonance coil L1The second end pass through electric capacity Cs2With resonance coil L2The second end Connection；
Resonance coil L1First end be connected to electric capacity C1One end, electric capacity C1The other end be connected to resonance coil Lf1's First end, resonance coil Lf1The second end be connected to switching tube S1Source electrode, switching tube S1Source electrode and switching tube S2Drain electrode connect Connect；Resonance coil L1The second end pass through resistance R1It is connected to switching tube S2Source electrode and electric capacity Cf1One end (i.e. semi-bridge inversion electricity The input on road), electric capacity Cf1The other end be connected to resonance coil Lf1First end；Resonance coil L1And Lf1And electric capacity C1With Cf1Constitute emitting side resonant network；
Resonance coil L2First end be connected to electric capacity C2One end, electric capacity C2The other end be connected to resonance coil Lf2's First end, resonance coil Lf2The second end be connected to diode D1Input (i.e. the input of full bridge rectifier)；Resonance line Enclose L2The second end pass through resistance R2It is connected to diode D2Input and electric capacity Cf2One end, electric capacity Cf2The other end connection To resonance coil Lf2First end；L2、Lf2、C2、Cf2Constitute receiving side resonant network；
Also include direct voltage source DC, switching tube S1Drain electrode be connected to direct voltage source DC positive pole, switching tube S2Source Pole is connected to direct voltage source DC negative pole, switching tube S1With switching tube S2Constitute half-bridge inversion circuit, and switching tube S1And S2's Electric capacity, switching tube S are connected between source electrode and drain electrode2Source electrode pass through electric capacity CpGround connection.
Full bridge rectifier is by diode D1、D2、D3And D4Composition, wherein, diode D1With diode D2Output end connect Connect, diode D3It is connected with diode D4 input, diode D1Input and diode D3Output end connection, two poles Pipe D2Input and diode D4Output end connection；Resonance coil L2First end pass sequentially through electric capacity C2And resonance coil Lf2It is connected to diode D1Input, resonance coil L2The second end pass through resistance R2It is connected to diode D2Input, two Pole pipe D2Input also pass through electric capacity Cf2It is connected to electric capacity C2With resonance coil Lf2Between；Diode D1、D2、D3And D4It is defeated Enter and be connected to electric capacity between end and output end；Diode D3Output end pass through electric capacity CtGround connection, diode D4Output end Pass through electric capacity CrGround connection；Diode D2Output end pass through electric capacity C3It is connected to diode D4Input, electric capacity C3Two ends simultaneously It is associated with electric capacity C4, it is used as the resistance R of loadLIt is connected in parallel on electric capacity C3Two ends.
It is defeated for a wireless charging system, it is necessary first to determine its basic parameter, i.e. input voltage U and working frequency f Depending on entering voltage U need as the case may be, working frequency f is related to resonant network parameter, and emitting side is with receiving side resonant network Parameter is determined according to following relation：
jωLf1=1/j ω Cf1 (1a)
jωLf2=1/j ω Cf2 (1b)
jωL1-1/jωC1=1/j ω Cf1 (1c)
jωL2-1/jωC2=1/j ω Cf2 (1d)
Wherein, the π f of ω=2.Coil coefficient of coup k, is determined by factors such as coil distance, relative positions, can influence system Transimission power, is regarded as variable processing in the present invention.Load RLAlso system output power and electromagnetic interference can be influenceed, is also considered as becoming Amount.Ideally, the transimission power of resonant network is expressed as follows：
Wherein, UinAnd UoutThe virtual value of the input and output voltage of resonant network, UoutBy load effect, M is two resonance lines Enclose L1、L2Between mutual inductance.
Fig. 1 is system conductive interference model circuit, CpIt is two switch mosfet pipe S1、S2Equivalent parasitic capacitance over the ground, Cs1And Cs2It is the parasitic capacitance between system transmitting coil and receiving coil, Ct、CrIt is the parasitic capacitance over the ground of diode.The electricity The parasitic parameter adding method of each device is as follows in road：
(1) in actual application, different k values can cause C in system conductive interference models1And Cs2Change, enter And influence outlet side electromagnetic interference.When coil coefficient of coup k increases, coil distance is larger compared near, relative area, Cs1And Cs2 Increase therewith, its big I is calculated as below formula according to capacity plate antenna and obtained：
Wherein, S is the facing area of capacitor two-plate, and d is the distance between capacitor two-plate, and ε is dielectric constant, k1For dielectric constant.
(2) relative area between ejecting plate, appropriate estimation plate spacing, according to public affairs are obtained by searching device handbook switch mosfet pipe Formula (4) can calculate its equivalent parasitic capacitance C over the groundpValue, can similarly calculate the parasitic capacitance C over the ground of diodet、Cr's Value.
Such as the simulation result in Fig. 2 and Fig. 3：
In Fig. 2 (a), outlet side common mode disturbances are in RL=50 Ω, k=0.15,0.25, interference value when 0.35, interference value Increase with the increase of the coefficient of coup.
In Fig. 2 (b), outlet side common mode disturbances are in k=0.35, RL=10 Ω, 20 Ω, interference value during 50 Ω, interference value Increase with the increase of load.
In Fig. 3 (a), outlet side DM EMI is in RL=50 Ω, k=0.15,0.25, interference value when 0.35, interference value Increase with the increase of the coefficient of coup.
In Fig. 3 (b), outlet side DM EMI is in k=0.35, RL=10 Ω, 20 Ω, interference value during 50 Ω, interference value Increase with the increase of load.
It can be seen from final simulation result：
(1) outlet side common mode disturbances increase with coefficient of coup k increase.Its reason is：On the one hand, between coil Coupled between the reduction of distance, coil it is even closer, by emitting side be delivered to receiving side energy increase；On the other hand, coupled systemes Several increases raise output voltage, the rise of receiving side commutation diode voltage-to-ground, interference increase.
(2) outlet side common mode disturbances are with load RLIncrease and increase.Its reason is：Outlet side voltage increases with load And increase, and then influence commutation diode voltage-to-ground to increase with load and increase.
(3) outlet side DM EMI increases with coefficient of coup k increase.Its reason of changes and common mode disturbances are with coupling The mechanism of index variation is similar.Significantly, since DM EMI is smaller in itself, its excursion also compares common mode disturbances It is small.
(4) outlet side DM EMI is with load RLIncrease and increase.Its reason of changes is with common mode disturbances with load The mechanism of change is similar.

Claims (9)

1. the electromagnetic interference prediction circuit of pair LCC resonance compensation wireless charging systems, it is characterised in that input voltage is by input Emitting side resonant network in the inverter circuit connection resonant network of side, receiving side resonant network is connected with outlet side rectification circuit, Through capacitor filtering, DC voltage is exported, the input side inverter circuit is half-bridge inversion circuit, and outlet side rectification circuit is full-bridge Rectification circuit.
2. the electromagnetic interference prediction circuit of according to claim 1 pair of LCC resonance compensation wireless charging system, its feature exists In, including resonance coil L1With resonance coil L2, resonance coil L1First end and resonance coil L2First end and resonance line Enclose L1The second end and resonance coil L2The second end be Same Name of Ends, resonance coil L1First end pass through electric capacity Cs1With resonance line Enclose L2First end connection, resonance coil L1The second end pass through electric capacity Cs2Resonance coil L2The second end connection；
Resonance coil L1And Lf1And electric capacity C1And Cf1Constitute emitting side resonant network, resonance coil L1With electric capacity C1, resistance R1String With electric capacity C after connectionf1Parallel connection, then with resonance coil Lf1Series connection, resonance coil Lf1It is connected with half-bridge inversion circuit；Resonance coil L2And Lf2And electric capacity C2And Cf2Constitute receiving side resonant network, resonance coil L2With electric capacity C2, resistance R2With electric capacity C after series connectionf2 Parallel connection, then with resonance coil Lf2Series connection, resonance coil Lf2It is connected to full bridge rectifier input.
3. the electromagnetic interference prediction circuit of according to claim 1 pair of LCC resonance compensation wireless charging system, its feature exists In, in addition to direct voltage source DC, switching tube S1Drain electrode be connected to direct voltage source DC positive pole, switching tube S2Source electrode connect It is connected on direct voltage source DC negative pole, switching tube S1With switching tube S2Constitute half-bridge inversion circuit, and switching tube S1And S2Source electrode Electric capacity, switching tube S are connected between drain electrode2Source electrode pass through electric capacity CpGround connection.
4. the electromagnetic interference prediction circuit of according to claim 1 pair of LCC resonance compensation wireless charging system, its feature exists In, in addition to diode D1、D2、D3And D4The full bridge rectifier of composition, wherein, diode D1With diode D2Output end connect Connect, diode D3With diode D4Input connection, diode D1Input and diode D3Output end connection, two poles Pipe D2Input and diode D4Output end connection；Resonance coil L2First end pass sequentially through electric capacity C2And resonance coil Lf2It is connected to diode D1Input, resonance coil L2The second end pass through resistance R2It is connected to diode D2Input, two Pole pipe D2Input also pass through electric capacity Cf2It is connected to electric capacity C2With resonance coil Lf2Between.
5. the electromagnetic interference prediction circuit of according to claim 4 pair of LCC resonance compensation wireless charging system, its feature exists In diode D1、D2、D3And D4Input and output end between be connected to electric capacity；Diode D3Output end pass through electricity Hold CtGround connection, diode D4Output end pass through electric capacity CrGround connection；Diode D2Output end pass through electric capacity C3It is connected to diode D4Input, electric capacity C3Two ends be parallel with electric capacity C4, it is used as the resistance R of loadLIt is connected in parallel on electric capacity C3Two ends.
6. the electromagnetic interference Forecasting Methodology of pair LCC resonance compensation wireless charging systems, it is characterised in that comprise the following steps：
Step 1), determine systematic parameter, including input voltage U, resonant frequency f, emitting side resonant inductance L1, Lf1With resonant capacitance C1、Cf1Receiving side resonant inductance L2, Lf2With resonant capacitance C2、Cf2, coil coefficient of coup k, load RL；
Step 2), set up system electromagnetic interference model, add-on system parasitic parameter；
Step 3), outlet side common mode, the waveform of DM EMI signal under simulation calculation different working condition.
7. the electromagnetic interference Forecasting Methodology of according to claim 6 pair of LCC resonance compensation wireless charging system, its feature exists In the step 1) in, it is first determined input voltage U and working frequency f, according to working frequency selection meet formula (1a)~ The resonant network capacitor and inductor parameter of (1d)：
jωLf1=1/j ω Cf1 (1a)
jωLf2=1/j ω Cf2 (1b)
jωL1-1/jωC1=1/j ω Cf1 (1c)
jωL2-1/jωC2=1/j ω Cf2 (1d)
Wherein, the π f of ω=2, load RLSystem output power and electromagnetic interference can be influenceed, variable, ideally, resonance is also considered as The transimission power of network is expressed as follows：
<mrow> <msub> <mi>P</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>P</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>MU</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <msub> <mi>U</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>&amp;omega;L</mi> <mrow> <mi>f</mi> <mn>1</mn> </mrow> </msub> <msub> <mi>L</mi> <mrow> <mi>f</mi> <mn>2</mn> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <mi>M</mi> <mo>=</mo> <mi>k</mi> <msqrt> <mrow> <msub> <mi>L</mi> <mn>1</mn> </msub> <msub> <mi>L</mi> <mn>2</mn> </msub> </mrow> </msqrt> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
Wherein, UinAnd UoutThe virtual value of the input and output voltage of resonant network, UoutBy load effect, M is resonance coil L1、L2 Between mutual inductance；Coil coefficient of coup k is determined by coil distance, relative position, is influenceed the transimission power of system, is regarded as in the present invention Variable processing；
Electric capacity CpIt is two switch mosfet pipe S1、S2Equivalent parasitic capacitance over the ground, electric capacity Cs1And Cs2Be system transmitting coil and Parasitic capacitance between receiving coil, electric capacity Ct、CrIt is the parasitic ginseng of each device in the parasitic capacitance over the ground of diode, the circuit Number adding method is as follows：
Electric capacity Cs1、Cs2、Cp、Ct、CrCapacitance obtained according to capacity plate antenna calculation formula (4)：
<mrow> <mi>C</mi> <mo>=</mo> <mfrac> <mrow> <mi>&amp;epsiv;</mi> <mi>S</mi> </mrow> <mrow> <mn>4</mn> <msub> <mi>&amp;pi;k</mi> <mn>1</mn> </msub> <mi>d</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
Wherein, S is the facing area of capacitor two-plate, and d is the distance between capacitor two-plate, and ε is dielectric constant, k1For Dielectric constant.
8. the electromagnetic interference Forecasting Methodology of according to claim 7 pair of LCC resonance compensation wireless charging system, its feature exists In when coil coefficient of coup k increases, coil distance is larger compared near, relative area, Cs1And Cs2Increase therewith, Cs1And Cs2Electricity Capacitance is obtained according to capacity plate antenna calculation formula (4).
9. the electromagnetic interference Forecasting Methodology of according to claim 7 pair of LCC resonance compensation wireless charging system, its feature exists In obtaining relative area between ejecting plate by searching device handbook switch mosfet pipe, appropriate estimation plate spacing can according to formula (4) Calculate its equivalent parasitic capacitance C over the groundpValue, can similarly calculate the parasitic capacitance C over the ground of diodet、CrValue.
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Application publication date: 20171020