CN109921523A - Magnetic resonance wireless energy transfer system based on SS topology - Google Patents
Magnetic resonance wireless energy transfer system based on SS topology Download PDFInfo
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Abstract
The present invention proposes a kind of wireless energy transfer system based on SS topology, the technical issues of efficiency is lower when for solving to load larger in the prior art and system complex, including the input power module collectively constituted by alternating current input module and DC_DC voltage reduction module, primary inverter module, primary impedance matching module, WPT module, secondary impedance matching module and secondary commutation filter module, pass through the structure for being spirally wound on two opening U-shaped magnetic core bottoms staggered relatively for conducting wire with secondary coil primary in design WPT module, and it designs secondary impedance matching module and the output impedance of WPT module is matched to optimum load point, improve system efficiency of transmission, furthermore design primary impedance matching module promotes the output impedance of primary inverter module, the input for enabling DC_DC voltage reduction module and alternating current input module form Power module is applicable in, and is substituted the D.C. regulated power supply of complexity or the switch power module containing transformer, is simplified system.
Description
Technical field
The invention belongs to wireless energy transmission technology fields, are related to a kind of magnetic resonance wireless energy transfer system, specifically relate to
And a kind of magnetic resonance wireless energy transfer system based on SS topology, the wireless power for relatively large load.
Background technique
Wireless energy transfer (Wireless Power Transmission, WPT) technology is always the hot topic of human research
Topic mainly carries out electric energy transmission to power supply unit in a non-contact manner.Compared with wired energy transmission, it avoids use
It mainly connects to obtain by conducting wire between electric equipment and generates the dangerous power supplies such as the exposed, abrasion of electric spark, conducting wire in energy process
Factor.The appearance of wireless energy transmission technology is certain special occasions: for example, sealed environment, rotary part, underwater monitoring etc.
Power supply opens new power supply approach；Simultaneously opened up induction electric automobile, high-speed maglev train feed, Medical Devices,
The application of consumer electronics and sensor network etc..
Wireless energy transfer system is broadly divided into wave radiation formula, inductive coupling type and magnetic resonance three types, wherein
Magnetic resonance is mainly that the magnetic resonance for utilizing two coils in electromagnetic field near field range realizes electric energy-magnetic energy-electric energy nothing
Heat input transmission.Wireless energy transfer system is compared with wave radiation formula wireless energy transfer system, biography big with transimission power
Defeated high-efficient and non-directional feature, and transimission power is increased to multikilowatt from pervious milliwatt, efficiency of transmission also obtains
It is greatly promoted, compared with inductive coupling type wireless energy transfer system, transmission range is greatly improved, and breaches inductive coupling type
The only limitation within millimeter grade of the wireless transmission distance of wireless energy transfer system.
Existing common magnetic resonance wireless energy transfer system is mainly by input power module, primary inverter module, WPT module
It is constituted with secondary commutation filter module, system efficiency of transmission and complexity etc. are to measure the important indicator of a system quality.
Its WPT module use it is most basic be two coil configuration, according to primary emission coil and secondary receiving coil respectively with its
Primary resonant compensating electric capacity is different with the connection type of secondary resonance compensating electric capacity, can be divided into series connection-series connection (SS) topology, string
Connection-parallel connection (SP) topology, parallel connection-series connection (PS) topology, in parallel-(PP) in parallel topology.Wherein SS topology has it primary anti-
It penetrates that impedance is unrelated with load, is suitable for the superperformances such as small load system, has obtained a lot of research and application.For example, application
Publication No. is 107681791 A of CN, and the patent application of entitled " a kind of half-bridge resonance wireless energy transfer system " discloses
A kind of half-bridge resonance wireless energy transfer system, including DC power supply, BUCK circuit, half-bridge inversion circuit, the first resonator,
Two resonators and auxiliary circuit, which mainly passes through BUCK circuit and system resonance state is realized in the control of auxiliary circuit
It maintains, more efficient electric energy transmission is realized with this.But its first resonator and the loop construction in the second resonator are simple,
Its second resonator is connected directly with load, causes the wireless energy transmission efficiency between two coils to be promoted limited.
In addition, for SS topology, it is corresponding primary anti-for relatively large load due to its own characteristic
Penetrate impedance very little, it means that the supply voltage that it only needs very little in the case where meeting certain power output, D.C. regulated power supply body
Product is huge, is not easy to the wireless energy system integration and commercialization, but if oneself one wireless energy of design since accessing alternating current
Transmission system is measured, prime is also required to design the more complicated switch power module containing transformer as input power module
It is able to satisfy application.In conclusion be directed to relatively large load situation, how to consider from the various pieces of wireless energy transfer system into
Since row optimization design completely efficient and simple structure the SS topology magnetic resonance wireless energy transfer accessing alternating current
System is a problem to be solved.
Summary of the invention
It is an object of the invention to overcome the problems of the above-mentioned prior art, it is humorous to propose a kind of magnetic based on SS topology
Shake wireless energy transfer system, for solve load existing in the prior art it is larger when efficiency is lower and the technology of system complex
Problem.
In order to achieve the above object, the technical solution adopted by the present invention include sequentially connected input power module 1, it is primary inverse
Become module 2, WPT module 3 and secondary commutation filter module 4, in which:
The input power module 1, for converting adjustable DC electricity output for the electric main of input；
The primary inverter module 2, for the DC voltage of input to be converted to high-frequency ac voltage output, including first
Switch metal-oxide-semiconductor S1With second switch metal-oxide-semiconductor S2, S2Drain electrode end and S1Source terminal be connected, source terminal ground connection；
The WPT module 3, for realizing electric energy-magnetic energy-electric energy wireless energy transfer, including the primary being serially connected
Transmitting coil LpWith its primary resonant compensating electric capacity Cp, and the secondary receiving coil L being serially connectedsWith its secondary resonance compensation
Capacitor Cs, and the primary emission coil L being serially connectedpWith its primary resonant compensating electric capacity CpWith the secondary reception line being serially connected
Enclose LsWith its secondary resonance compensation capacitor CsArranged relative；
The secondary commutation filter module 4, the direct current for converting smooth steady for the high-frequency alternating current of input are defeated
Out, including the rectifier bridge being made of four Schottky or the fast diode for restoring type, and one end is exported with rectifier bridge and is connected
The first filter capacitor CL, the first filter capacitor CLIt is grounded with the other end of rectifier bridge output；
The input power module 1, including alternating current input module 11 and DC_DC voltage reduction module 12, the alternating current input mould
Block 11, for converting the electric main of input to the direct current electricity output of smooth steady, including one end interconnection, another termination
The industrial frequency rectifying bridge on ground and the second filter capacitor C；The DC_DC voltage reduction module 12, for export input power module 11
Direct current realizes adjustable reduced output voltage, including high-voltage power metal-oxide-semiconductor Sb, fast recovery diode Db, inductance LbWith third filter capacitor
Cb；The high-voltage power metal-oxide-semiconductor SbDrain electrode end be connected with described that unearthed one end second filter capacitor C；The fast recovery
Diode DbCathode and SbSource terminal be connected, plus earth；The inductance LbOne end and the fast recovery diode DbCathode
It is connected, the other end and the third filter capacitor CbWith the first switch metal-oxide-semiconductor S1Drain electrode end be connected, third filtering
Capacitor CbThe other end ground connection；
It is connected with primary impedance matching module 5 between the primary inverter module 2 and the WPT module 3, the primary impedance
Matching module 5, for promoting the output end port Impedance of the primary inverter module 2, including the first matching inductance Lf, first
With capacitor Cf, the second matching inductance Lm2With the second matching capacitance Cm2；The first matching inductance LfOne end opened with described first
Close metal-oxide-semiconductor S1Source terminal and second switch metal-oxide-semiconductor S2Drain electrode end be connected, the other end and the first matching capacitance CfOne
End is connected；The second matching capacitance Cm2One end and the first matching capacitance CfThe other end and it is described second matching electricity
Feel Lm2One end be connected, the Cm2The other end ground connection, the second matching inductance Lm2The other end and the primary resonant compensate
Capacitor CpOne end be connected；
It is connected with secondary impedance matching module 6 between the WPT module 3 and the secondary commutation filter module 4, the secondary
Impedance matching module 6, for the output port of the WPT module 3 to be impedance-matched to its optimum load point, including third matching
Inductance Lm1And and Lm1The connected third matching capacitance C in one endm1；The third matching capacitance Cm1Both ends and the secondary commutation
The connection of rectifier bridge input terminal described in filter module 4, third matching inductance Lm1The other end and the secondary resonance compensating electric capacity
CsOne end be connected；
The WPT module 3, primary emission coil L thereins, including primary U-shaped magnetic core and be spirally wound on primary U-shaped
The conducting wire of magnetic core bottom, secondary receiving coil Lp, including secondary U-shaped magnetic core and it is spirally wound on leading for secondary U-shaped magnetic core bottom
Line, and primary U-shaped magnetic core is opposite with the opening of secondary U-shaped magnetic core.
The above-mentioned magnetic resonance wireless energy transfer system based on SS topology, the first matching inductance LfWith the first matching electricity
Hold CfAnd the second matching inductance Lm2With the second matching capacitance Cm2, meet following condition respectively:
Wherein, the π of ω=2 f, f are the resonance frequency of WPT module, and R is the equivalent port of primary impedance matching module output end
Impedance, Re2For object matching equivalent impedance, and R=Re2, RepFor the equivalent port Impedance of WPT module input to be matched.
The above-mentioned magnetic resonance wireless energy transfer system based on SS topology, the third matching inductance Lm1Electricity is matched with third
Hold Cm1Meet following condition:
Wherein f is the resonance frequency of WPT module, RoptEquivalent impedance, R are matched for optimum targeteIt is whole for secondary to be matched
Flow the equivalent port Impedance of filter module input terminal.
It is above-mentioned be based on SS topology magnetic resonance wireless energy transfer system, it is described to be spirally wound on primary U-shaped magnetic core bottom
Conducting wire and the conducting wire for being spirally wound on secondary U-shaped magnetic core bottom, using single strand of copper wire or multiply litz wire.
Compared with prior art, the present invention having the advantage that
1. spiral winding has the U-shaped magnetic core of primary of conducting wire opposite with the opening of secondary U-shaped magnetic core in WPT module of the present invention,
The magnetic coupling path between coil is optimized, the mutual inductance between coil is increased, improves the efficiency of transmission of WPT module, simultaneously
The output impedance of WPT module and the matching of optimum load point are realized by secondary impedance matching module, make WPT module output impedance
The output of its maximal efficiency is just corresponded to, compared with prior art, effectively improves system effectiveness.
2. the present invention improves the output impedance of primary inverter module by primary impedance matching module, so that equal-wattage etc.
Required supply voltage increases under grade, so that the input and output voltage difference of DC_DC module is able to maintain that at one reasonably
Range accesses DC_DC voltage reduction module as input power on the basis of alternating current input module, avoids the prior art in electricity consumption
Complicated defect caused by switch power module when loading larger using D.C. regulated power supply or containing transformer is easy to real
The existing system integration.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is primary impedance matching module basic circuit diagram of the invention；
Fig. 3 is primary coil and secondary coil structure schematic diagram in WPT module of the invention；
Fig. 4 is the WPT module principle of equal effects circuit diagram of the invention using SS topology；
Fig. 5 is secondary impedance matching module basic circuit diagram of the invention；
Fig. 6 is that the present invention is compared with WPT module input/output port mean power when secondary impedance matching module is not added
Simulation result schematic diagram；
Fig. 7 is that the present invention is imitated with primary inverter module supplying power for input end voltage-contrast when primary impedance matching module is not added
True result schematic diagram；
Specific embodiment
In the following with reference to the drawings and specific embodiments, present invention is further described in detail:
Referring to Fig.1, the present invention includes sequentially connected input power module 1, primary inverter module 2, primary impedance matching
Module 5, WPT module 3, secondary impedance matching module 6 and secondary commutation filter module 4, in which:
The input power module, including alternating current input module 11 and DC_DC voltage reduction module 12, the alternating current input module
11, including one end is connected with industrial frequency rectifying bridge, the second filter capacitor C of other end ground connection；The industrial frequency rectifying bridge is by input
The electric main of 220V/50Hz is converted into the direct current containing larger ripple component, after second filter capacitor filtering
Largely eliminate its ripple component, smooth steady output is the high voltage direct current of 308V ± 10%, is input to and is attached thereto
In the DC_DC voltage reduction module 12.The DC_DC voltage reduction module 12, including high-voltage power metal-oxide-semiconductor Sb, fast recovery diode Db、
Inductance LbWith third filter capacitor Cb；The high-voltage power metal-oxide-semiconductor SbDrain electrode end and the second filter capacitor C it is unearthed
That one end is connected；The fast recovery diode DbCathode and SbSource terminal be connected, plus earth；The inductance LbOne end with
The fast recovery diode DbCathode is connected, the other end and the third filter capacitor CbIt is connected, the third filter capacitor Cb's
Other end ground connection；The DC_DC voltage reduction module 12 is by giving the high-voltage power metal-oxide-semiconductor SbThe height of the certain duty ratio of gate terminal
The input of frequency pulse signal, controls the high-voltage power metal-oxide-semiconductor SbSwitch and closure, and pass through the fast recovery diode Db, electricity
Feel LbWith third filter capacitor CbEffect after by input voltage reduce export, provided for post-module required under certain power
Voltage value changes the duty ratio size of the pulse signal, and adjustable voltage output can be realized；In the alternating current input module 11
On the basis of access the DC_DC voltage reduction module 12, compare the complicated switch power module containing transformer and directly adopt straight
Flow regulated power supply to wireless energy transfer system power supply for, device used is less, design it is relatively simple, be easy to the system integration with
Commercialization, thus it is more advantageous for the wireless energy transfer system for being designed since alternating current input；However, it is converted
Efficiency is related with output-input voltage difference, and output voltage differs bigger with input voltage, and transformation efficiency is lower.It is general next
It says, output voltage just can guarantee that this module has a higher efficiency when being 20% or more of input voltage, and otherwise efficiency will compare
It is relatively low, it is no longer desirable for one and requires in efficient wireless energy transfer system.
The primary inverter module 2, including first switch metal-oxide-semiconductor S1With second switch metal-oxide-semiconductor S2, S2Drain electrode end and S1
Source terminal be connected, source terminal ground connection；The primary inverter module 2 by giving first switch metal-oxide-semiconductor S respectively1It is opened with second
Close metal-oxide-semiconductor S2Grid two-way 180 degree reverse phase duty ratio be 50% high-frequency pulse signal (frequency of the pulse signal need to be with
The WPT module resonance frequency is consistent), two pipe alternate conductions, the DC voltage being inputted are converted into high frequency side at this time
Wave voltage output.
The primary impedance matching module 5, including the first matching inductance Lf, the first matching capacitance Cf, the second matching inductance
Lm2With the second matching capacitance Cm2；The first matching inductance LfOne end and the first switch metal-oxide-semiconductor S1Source terminal is connected, separately
One end and the first matching capacitance CfOne end be connected；The second matching capacitance Cm2One end and first matching capacitance
CfThe other end and the second matching inductance Lm2One end be connected, the Cm2The other end ground connection, second matching inductance
Lm2The other end and the primary resonant compensating electric capacity CpOne end be connected；As previously mentioned, the DC_DC voltage reduction module 12 is answered
With related with its output-input voltage difference, whether the size of transformation efficiency determines that it is applicable in, after alternating current input module,
The input voltage of DC_DC voltage reduction module is the high voltage direct current of 308V ± 10%, and in order to make, it is suitable for wireless energy transfer systems
System, needs to guarantee its input and output voltage difference within the scope of one relatively reasonable, i.e., its output voltage cannot be too small；However
When SS topology magnetic resonance wireless energy transfer system corresponds to relatively large load, due to its own characteristic, the WPT mould
The corresponding primary reflective impedance very little of block, the i.e. equivalent port Impedance very little of its input terminal, it means that meeting certain power
Lower its of output only needs the supply voltage of very little.The effect of the primary impedance matching module 6 is exactly to be the former primary
The output impedance of inverter module 2 is promoted to a biggish impedance value by the input impedance of the original lesser WPT module 3,
Thus the voltage needed for the primary inverter module 2 when meeting the output of certain power is improved, namely improves the DC_
The output voltage of DC voltage reduction module 5 makes it meet the application in SS topology magnetic resonance wireless energy transfer system at this time.Reference
Fig. 2, the specific design principle and process of the primary impedance matching module 6 are as follows:
As shown in Fig. 2, from capacitor Cm2The input port impedance for the primary impedance matching module 6 that left side is seen into can table
It is shown as
Ze2=Re2+jXe2 (1)
The equivalent port Impedance for enabling 3 input terminal of WPT module is Rep, in order to apply this impedance transformer network right
RepTransformation on, then must make the equivalent impedance imaginary part 0 of above formula, and real part is equal to biggish object matching required for our
Equivalent impedance Re2, i.e., for above formula, need to meet
Wherein, Xm3、Xm4Respectively the second matching capacitance Cm2With the second matching inductance Lm2Reactance value.
For above-mentioned equation group, only work as Re2> RepShi Caiyou real solution, at this time the parameter of matching network be
I.e.
Wherein, f is the resonance frequency of the WPT module.
But the complete primary impedance matching module 6 is also needed comprising in the primary impedance matching module 6 at this time
First matching inductance Lf, the first matching capacitance Cf, because primary inverter module 2 output is high frequency square wave voltage, need to set
Meter is by the first matching inductance Lf, the first matching capacitance CfThe resonator, filter network of composition, the high frequency square wave voltage filtering output it
Become the sinusoidal ac being near the mark, otherwise, this impedance matching result will be very inaccurate.The design of LC parameter can press at this time
According to
It is designed, R is the equivalent port Impedance of 5 output end of primary impedance matching module, and R=Re2, R hereine2
It is matched a biggish impedance value, supply voltage needed for this primary 2 prime of inverter module being powered increases,
The relatively simple DC_DC voltage reduction module 12 is added on the basis of the alternating current input module 11 efficiently to be accomplished, from
And prime power supply module complexity is reduced, and the voltage needed for the primary inverter module 2 is higher, i.e., the described DC_DC drop
The voltage value of 12 reduced output voltage of die block is higher, and decompression transfer efficiency is higher.
The WPT module 3, including the primary emission coil L being serially connectedpWith its primary resonant compensating electric capacity Cp, Yi Jixiang
Mutually concatenated secondary receiving coil LsWith its secondary resonance compensation capacitor Cs, and the primary emission coil L being serially connectedpAt the beginning of it
Grade resonance compensation capacitor CpWith the secondary receiving coil L being serially connectedsWith its secondary resonance compensation capacitor CsArranged relative；Specifically
When work, primary emission coil LpWith its primary resonant compensating electric capacity CpConstitute primary resonant circuit, secondary receiving coil LsAnd its
Secondary resonance compensating electric capacity CsConstitute secondary resonance circuit, primary inverter module output AC voltage frequency and magnetic coupling resonant structure
The intrinsic frequency of two resonant tanks is identical in being divided to, and the energy of primary inverter module injection carries out electricity in primary side resonant tank
The transformation of energy-magnetic field energy, as primary transmitting coil LpThe electromagnetic field of generation is returned by the secondary end resonance with same resonance frequency
Road feel should then, and two resonant tanks resonate, and carry out the transmission of energy in a manner of electromagnetic field between inductance coil,
Final end resonant tank magnetic field energy-electric energy received again is converted to post-module power supply.In WPT module, coil knot is commonly used
Structure is planar spiral winding and stereo spiral coil, once coil determines, resonance frequency is determined, then its transmission characteristic determines.It wants
Want to obtain better transmission characteristic, such as efficiency, then needs to improve conventional coil form.Referring to Fig. 3, primary therein
Transmitting coil Ls, including primary U-shaped magnetic core and the conducting wire for being spirally wound on primary U-shaped magnetic core bottom, secondary receiving coil Lp, packet
The conducting wire for including secondary U-shaped magnetic core and being spirally wound on secondary U-shaped magnetic core bottom, and primary U-shaped magnetic core and secondary U-shaped magnetic core are opened
Mouth is opposite, and winding wire wire rod is single strand of copper wire or multiply litz wire.It is specific optional, primary and secondary coil and magnetic core in the present invention
It is consistent, coil line footpath (diameter) r is 1mm, and the number of turns is 28 circles, and core cross section is square, side length D1=18mm, length D2
=44mm, D3=20mm, spacing d=30mm.The parameters such as the mutual inductance between the efficiency and primary and secondary coil of WPT module are related,
In the case where other parameters all determine, mutual inductance is bigger, and efficiency of transmission is higher, compares conventional coil form, and spiral winding has
The U-shaped magnetic core of primary of conducting wire is opposite with the opening of secondary U-shaped magnetic core, optimizes the magnetic coupling path between coil, increases line
Mutual inductance between circle, magnetic field coupling effect further enhance, to improve the efficiency of transmission of WPT module.
The secondary impedance matching module 6, including third matching inductance Lm1And and Lm1The connected third in one end matches electricity
Hold Cm1；The third matching capacitance Cm1The other end is connect with rectifier bridge input terminal described in the secondary commutation filter module 4,
Third matching inductance Lm1The other end be connected with one end of the secondary resonance compensating electric capacity；The secondary impedance matching module 6
Effect be to be impedance-matched to the output port of the WPT module 3 on its optimum load point because it corresponds to different loads
Efficiency is different, and practical application is difficult to be located just on its optimum load point for electric loading, matches it to optimum load point energy
Enough effective maximal efficiency transmission for realizing the designed WPT module 3.Referring to Fig. 4, SS topology is used in the present invention
WPT module can be equivalent to basic circuit diagram shown in Fig. 4, wherein RprIndicate the internal resistance of primary emission coil, RsrIndicate that secondary connects
The internal resistance of take-up circle, ReFor grade be associated in rear class output end equivalent impedance namely above-mentioned 4 input terminal of secondary commutation bridge filter module
Equivalent impedance, ω is the resonance angular frequency of WPT module, and M is the mutual inductance between two coils.
ZpAnd ZsTwo terminal impedances are respectively represented, then following equation can be obtained by KVL:
Two formula simultaneous can be released
By Thevenin's theorem, the equivalent load of power supply is
Wherein, Section 2 is the equivalent reflective impedance that transmitting terminal is arrived in secondary conversion
ZpAnd ZsIt can be expressed as
According to series resonance conditionIt takesSo at a resonant condition, on
Formula can abbreviation, obtain
Power supply equivalent load can be reduced to
This ZepThe equivalent port Impedance R of as described 3 input terminal of WPT moduleep, thus formula is it is found that RepWith ReBe inversely proportional pass
System, the output end port Impedance of the WPT module 3 is bigger namely corresponding power load is bigger, the equivalent port of input terminal
Impedance is smaller, and the supply voltage under certain power output needed for it is with regard to smaller.
The efficiency eta for defining magnetic resonance mechanism is ReThe active-power P of absorptioneThe active power provided with primary side input terminal
PpThe ratio between, then it can obtain
It similarly can abbreviation under condition of resonance are as follows:
Transmitting coil is respectively with the respective quality factor of receiving coilAnd between coil
Coefficient of coup k and the relationship of mutual inductance M beAll of which, which is substituted into above formula, can get the efficiency of transmission η of WPT
About QpAnd Qs, coefficient of coup k, equivalent load ReEfficiency expression formula, according toThe maximum transmitted effect of WPT module can be obtained
Rate and corresponding optimum load point (i.e. optimum target matching equivalent impedance) are respectively as follows:
The present invention designs the secondary impedance matching module 6 as a result, for by the output port impedance of the WPT module
It is matched on its optimum load point, the maximal efficiency transmission of WPT module is realized with this.Referring to Fig. 5, from third matching inductance Lm1It is left
The input port impedance for the secondary impedance matching module 7 that side is seen into is represented by
Ze1=Re1+jXe1 (15)
In order to apply this impedance transformer network to ReTransformation on, then must make the equivalent impedance imaginary part of above formula
0, and real part is equal to the object matching impedance R that we needopt, i.e., for above formula, need to meet
For above-mentioned equation group, only work as Ropt< ReShi Caiyou real solution, at this time the parameter of matching network be
Wherein, Xm1、Xm2Respectively third matching capacitance Cm1With third matching inductance Lm1Reactance value.
I.e.
Wherein, f is the resonance frequency of the WPT module.
The secondary commutation filter module 4, including the rectification being made of four Schottky or the fast diode for restoring type
Bridge, and the first filter capacitor C being connected with rectification bridge output endL, the first filter capacitor CLThe other end ground connection；It is described
The input of secondary commutation filter module 4 is high-frequency alternating current, and general diode is easy to damage for commutating pole and larger, institute is lost
To need exist for using the diode that faster Schottky of smaller and recovery time or fast recovery type is lost；The secondary commutation
The direct current that the high-frequency alternating current that secondary receives is converted into smooth steady is supplied power load R by filter module 4L, generally,
The equivalent port Impedance R of its input terminaleMeet relational expression
Below in conjunction with emulation experiment, technical effect of the invention is described further:
1, simulated conditions and content:
Circuit system as shown in Figure 1 is built in 1.1 present PSPICE business softwares, enabling output power is 30W, loads RL
It is 50 ohm, CLFor 100uF, the equivalent resistance of object matching of primary inverter module output port impedance, that is, primary impedance matching module
Anti- Re2It is 100 ohm, designed WPT system primary coil LpFor 121.52uH, series resonance compensating electric capacity CpFor 83.4nF,
Resonance frequency is 50k, internal resistance RprIt is 0.06 ohm, secondary coil Lp=Ls, compensating electric capacity Cp=Cs, internal resistance Rsr=Rpr, coupling
Coefficient k=0.105, CbFor 188.8uF, LbFor 1.73mH, C 1000uF, other in summary formula (4) (5) (11) (16) (19)
Can be calculated other parameters is Cm1=237.34nF, Lm1=38.48uF, Cm2=155.08nF, Lm2=62.69uF, Lf=
590uF, Cf=17.15nF.
The mean power of the WPT module input/output port of secondary impedance matching module and non-added-time is added in 1.2 emulation, imitates
True result is as shown in Figure 6.
Voltage value needed for primary impedance matching module and non-added-time primary inverter module is added in 1.3 emulation, emulation
As a result as shown in Figure 7.
2, simulation result:
As shown in fig. 6, Fig. 6 (a) is the input port and output port of WPT module when secondary impedance matching module is added
Average power curve, then its efficiency is input/output=31.028/32.100=0.9666；Fig. 6 (b) is not add secondary impedance
The average power curve of the input port and output port of WPT module when matching module, can similarly obtain its efficiency is 0.8646, can
See, the introducing of secondary impedance matching module largely improves the efficiency of transmission of WPT module.
As shown in fig. 7, Fig. 7 (a) is voltage needed for primary inverter module input terminal when primary impedance matching module is added
Value is 122V, and voltage is higher at this time, and difference is not especially big compared with the voltage of 308V ± 10%, is able to maintain that DC_DC module
Input and output voltage difference in a reasonable range so as to add DC_DC voltage reduction module to collectively form defeated for alternating current input module
Enter power module to be applicable in, simplifies system；And Fig. 7 (b) is that primary inverter module inputs when not adding primary impedance matching module
Required voltage value (final load output power 30W is constant) is held, at this time only 27.3V, DC_DC voltage reduction module will no longer at this time
Power supply suitable for first inverter module front end.
Claims (4)
1. a kind of magnetic resonance wireless energy transfer system based on SS topology, including sequentially connected input power module (1), just
Grade inverter module (2), WPT module (3) and secondary commutation filter module (4), in which:
The input power module (1), for converting adjustable DC electricity output for the electric main of input；
The primary inverter module (2) exports for the DC voltage of input to be converted to high-frequency ac voltage, including first opens
Close metal-oxide-semiconductor S1With second switch metal-oxide-semiconductor S2, S2Drain electrode end and S1Source terminal be connected, source terminal ground connection；
The WPT module (3), for realizing electric energy-magnetic energy-electric energy wireless energy transfer, including the primary hair being serially connected
Ray circle LpWith its primary resonant compensating electric capacity Cp, and the secondary receiving coil L being serially connectedsWith its secondary resonance compensation electricity
Hold Cs, and the primary emission coil L being serially connectedpWith its primary resonant compensating electric capacity CpWith the secondary receiving coil being serially connected
LsWith its secondary resonance compensation capacitor CsArranged relative；
The secondary commutation filter module (4), for converting the high-frequency alternating current of input to the direct current electricity output of smooth steady,
Including the rectifier bridge being made of four Schottky or the fast diode for restoring type, and export that one end is connected with rectifier bridge the
One filter capacitor CL, the first filter capacitor CLIt is grounded with the other end of rectifier bridge output；
It is characterized by:
The input power module (1), including alternating current input module (11) and DC_DC voltage reduction module (12), the alternating current input
Module (11), it is another for converting the electric main of input to the direct current electricity output of smooth steady, including one end interconnection
Hold the industrial frequency rectifying bridge and the second filter capacitor C of ground connection；The DC_DC voltage reduction module (12) is used for input power module
(11) direct current exported realizes adjustable reduced output voltage, including high-voltage power metal-oxide-semiconductor Sb, fast recovery diode Db, inductance LbWith
Three filter capacitor Cb；The high-voltage power metal-oxide-semiconductor SbDrain electrode end be connected with described that unearthed one end second filter capacitor C；
The fast recovery diode DbCathode and SbSource terminal be connected, plus earth；The inductance LbOne end and the fast recovery two
Pole pipe DbCathode is connected, the other end and the third filter capacitor CbWith the first switch metal-oxide-semiconductor S1Drain electrode end be connected, institute
State third filter capacitor CbThe other end ground connection；
It is connected with primary impedance matching module (5) between the primary inverter module (2) and the WPT module (3), primary resistance
Anti- matching module (5), for promoting the output end port Impedance of the primary inverter module (2), including the first matching inductance Lf、
First matching capacitance Cf, the second matching inductance Lm2With the second matching capacitance Cm2；The first matching inductance LfOne end with it is described
First switch metal-oxide-semiconductor S1Source terminal and second switch metal-oxide-semiconductor S2Drain electrode end be connected, the other end and first matching capacitance
CfOne end be connected；The second matching capacitance Cm2One end and the first matching capacitance CfThe other end and described second
Matching inductance Lm2One end be connected, the Cm2The other end ground connection, the second matching inductance Lm2The other end and the primary it is humorous
Shake compensating electric capacity CpOne end be connected；
Secondary impedance matching module (6), this time are connected between the WPT module (3) and the secondary commutation filter module (4)
Grade impedance matching module (6), for the output port of the WPT module (3) to be impedance-matched to its optimum load point, including the
Three matching inductance Lm1And and Lm1The connected third matching capacitance C in one endm1；The third matching capacitance Cm1Both ends and described time
The input terminal connection of rectifier bridge described in grade rectification filtering module (4), third matching inductance Lm1The other end and the secondary it is humorous
Shake compensating electric capacity CsOne end be connected；
The WPT module (3), primary emission coil L thereins, including primary U-shaped magnetic core and it is spirally wound on primary U-shaped magnetic core
The conducting wire of bottom, secondary receiving coil Lp, including secondary U-shaped magnetic core and the conducting wire for being spirally wound on secondary U-shaped magnetic core bottom, and
Primary U-shaped magnetic core is opposite with the opening of secondary U-shaped magnetic core.
2. the magnetic resonance wireless energy transfer system according to claim 1 based on SS topology, it is characterised in that: described
One matching inductance LfWith the first matching capacitance CfAnd the second matching inductance Lm2With the second matching capacitance Cm2, meet respectively as follows
Condition:
Wherein, the π of ω=2 f, f are the resonance frequency of WPT module, and R is that the equivalent port of primary impedance matching module output end hinders
It is anti-, Re2For object matching equivalent impedance, and R=Re2, RepFor the equivalent port Impedance of WPT module input to be matched.
3. the magnetic resonance wireless energy transfer system according to claim 1 based on SS topology, it is characterised in that: described
Three matching inductance Lm1With third matching capacitance Cm1Meet following condition:
Wherein f is the resonance frequency of WPT module, RoptEquivalent impedance, R are matched for optimum targeteIt is filtered for secondary commutation to be matched
The equivalent port Impedance of wave module input.
4. according to claim 1 be based on SS topology magnetic resonance wireless energy transfer system, it is characterised in that: the spiral
It is wrapped in the conducting wire of primary U-shaped magnetic core bottom and is spirally wound on the conducting wire of secondary U-shaped magnetic core bottom, using single strand of copper wire or more
Stock litz wire.
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| CN110620416A (en) * | 2019-09-10 | 2019-12-27 | 上海科技大学 | Novel single-stage isolation wireless quick charging system |
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| CN101699708A (en) * | 2002-05-13 | 2010-04-28 | 捷通国际有限公司 | Contact-less power transfer and method |
| CN1996711A (en) * | 2006-12-08 | 2007-07-11 | 广州电器科学研究院 | Inductive coupled wireless power transfer device |
| CN204992792U (en) * | 2015-03-01 | 2016-01-20 | 华南理工大学 | Add bi -polar impedance transforming network's resonant mode wireless power transmission system |
| US20170240056A1 (en) * | 2016-02-19 | 2017-08-24 | Ford Global Technologies, Llc | Ss-l wireless power transfer compensation circuit |
| US20170279309A1 (en) * | 2016-03-24 | 2017-09-28 | Hyundai Motor Company | Primary coil circuit for wireless power transfer, ground assembly using the same, and manufacturing method therefor |
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| CN110620416A (en) * | 2019-09-10 | 2019-12-27 | 上海科技大学 | Novel single-stage isolation wireless quick charging system |
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