CN105978172B - Inverter circuit multiple physical field analysis method based on radio energy transmission system loss - Google Patents
Inverter circuit multiple physical field analysis method based on radio energy transmission system loss Download PDFInfo
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Classifications
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- H02J5/005—
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to wireless power transmission technical fields, and in particular to the inverter circuit multiple physical field analysis method based on radio energy transmission system loss.The analysis method is using magnetic resonance type radio energy transmission system as research object, mathematical modeling is carried out to magnetic resonance type radio energy transmission system, model is analyzed, calculate the loss of magnetic resonance type radio energy transmission system each section, multiple physical field modeling analysis is carried out to high-frequency inverter circuit, to optimize layout.Each section of this method quantitative analysis radio energy transmission system is lost, help to improve the transmission efficiency and output power of system, thermal design technical research is carried out to high-frequency inverter circuit link the most serious of generating heat using the modeling of FInite Element multiple physical field, it is optimized from its circuit layout, interior media and shell mechanism, reduce the node temperature of inverter circuit main devices, the reliability for improving system safe and stable operation, extends the service life, has important practical value.
Description
Technical field
The invention belongs to wireless power transmission technical fields, more particularly to the inversion based on radio energy transmission system loss
Circuit multiple physical field analysis method.
Background technology
Magnetic coupling resonance formula wireless energy transfer system using it is two or more have identical resonance frequency and high-quality because
The electromagnetic system of element generates EMR electromagnetic resonance by the inductance and capacitance effect that work in specific frequency, and big ratio occurs for high-frequency energy
Example exchanges and is supported absorption.The technology can realize wireless power within the scope of several meters, there are when barrier also can high efficiency of transmission,
It is novel and great potential technology.
But for the technology while showing huge economic benefit with social benefit foreground, there is also transmission efficiencies not
The problems such as height, excessive loss.The technology mainly uses the main element that coupling coil is transmitted as energy, is occurred using coil
Resonance effect makes energy high efficiency of transmission.But system often by coil standoff distance farther out, resonance effect is weaker, coupling
The influence of the factors such as not strong, voltage and current when its inside generates resonance is very big, the working frequency that needs is also very high.And with
The raising of frequency, the copper loss of system electromagnetic coupling mechanisms will will increase very much, and the efficiency of such system can substantially reduce.It is larger
Loss, device heating can be made than more serious.The overheat of electronic equipment can seriously affect the performance and reliability of electronic product
Raising, while also reducing the service life of electronic equipment.
Therefore it is required to each section loss of quantitative analysis radio energy transmission system, the loss of its each section is specified and accounts for
Than being provided with reference data for the design of radio energy transmission system and the promotion of efficiency, passing through what system components were lost
Analysis carries out thermal design technical research using effective modeling method to high-frequency inverter circuit link the most serious of generating heat, from
It is optimized on its circuit layout, interior media and shell mechanism, reduces the node temperature of inverter circuit main devices, optimized
The selection of system integral layout and component, makes that system structure design is reasonable, parameter setting is reasonable, enhances the stability of system.
Invention content
The object of the present invention is to provide a kind of mathematical model of quantitative analysis radio energy transmission system each section loss, profits
Thermal design technical research is carried out to high-frequency inverter circuit link the most serious of generating heat with the modeling of FInite Element multiple physical field, from it
The method optimized on circuit layout, interior media and shell mechanism.To reduce the node temperature of inverter circuit main devices
Degree improves system transmission efficiency and output power, enhances the reliability of system safe and stable operation, prolongs the service life.
To achieve the above object, the technical solution adopted in the present invention is to be lost based on radio energy transmission system inverse
Become circuit multiple physical field analysis method, the analysis method is using magnetic resonance type radio energy transmission system as research object, to magnetic
Resonant radio energy transmission system carries out mathematical modeling, analyzes model, calculates magnetic resonance type wireless power transmission
System components are lost, and multiple physical field modeling analysis is carried out to high-frequency inverter circuit, to optimize layout；Including following step
Suddenly：
Step 1 carries out mathematics model analysis to magnetic resonance type radio energy transmission system；
Step 2 analyzes the factor for influencing magnetic resonance type radio energy transmission system efficiency of transmission, and determines them
Between relationship；
Step 3, the quantitatively device loss on calculating high-frequency inverter circuit；
Step 4 calculates resonance coil loss；
Step 5 calculates resonant capacitance internal resistance loss；
Step 6 calculates the loss of high frequency full-bridge rectification；
Step 7 carries out model analysis using 5.0 softwares of Comsol Multiphysics to high-frequency inverter circuit, obtains
Its thermal profile, and compared with the result obtained by infrared detecting set, using Comsol Multiphysics 5.0 to high frequency
Inverter circuit is laid out optimization, to reduce thermal coupling and the bulk temperature between each device.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
1 realization includes the following steps：
Step 1.1, the mathematical model for establishing magnetic resonance type radio energy transmission system, and simplify circuit model；
Step 1.2 is analyzed magnetic resonance type radio energy transmission system model by mode coupling theories, Derivation
Efficiency of transmission and output power；
Step 1.3 analyzes magnetic resonance type radio energy transmission system model by classical Circuit theory, according to mutual
Sense theory and Kirchhoff's theorem law, derive that efficiency of transmission is
In formula, P1For input power, P2For output power, M is the mutual inductance of coupling coil, and w is the resonance of coupling coil
Frequency, RLFor load resistance, ZPFor primary consumer, ZSFor secondary winding impedance.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
2 realization includes the following steps：
The influence of step 2.1, analysis task driven signal frequency to magnetic resonance type radio energy transmission system efficiency of transmission,
To determine magnetic resonance type radio energy transmission system best operating point；
The influence of step 2.2, the analysis coefficient of coup to magnetic resonance type radio energy transmission system efficiency of transmission；Coil couples
Coefficient k is related with primary coil, the relative distance of secondary coil and opposite placement position；With the increasing of coil coefficient of coup k
Add, the ratio of electric current and voltage starts paddy peak separating phenomenon occur, and magnetic resonance type radio energy transmission system efficiency of transmission is maximum
Point is the resonant frequency point of the system, and corresponding current is in bimodal median with voltage ratio；
The influence of step 2.3, analysis load to the efficiency of transmission；Only consider the magnetic resonance type under pure resistance working condition
Coil and resonance capacitor equivalent are resistance by radio energy transmission system efficiency.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
3 realization includes the following steps：
The general calculation formula of step 3.1, device loss is
In formula, U is the pressure drop on device, and I is the electric current flowed through on device, and D (t) is duty ratio；
Step 3.2, MOSFET losses；
Its conduction loss calculation formula is
In formula, RDS(on) conducting resistance for being MOSFET；ID(on)For MOSFET conducting when drain current virtual value；ton
For turn-on time；F is the working frequency of MOSFET；
Its turn-on consumption calculation formula is
In formula, VDS(t) the drain-source voltage across poles for being MOSFET；iD(t) drain current for being MOSFET；
T switch-on are the opening process time of MOSFET；T is the work period of MOSFET；
Its turn-off power loss calculation formula is
In formula, tswitch-offFor the turn off process time of MOSFET；
In one cycle, a pair of of MOSFET works together, so the loss of MOSFET is in a cycle
PMOS=2 (PMOS-on+Pswitch-on+Pswitch-off) (3.5)；
Step 3.3, drive loss；
When the driving frequency of magnetic resonance type radio energy transmission system reaches megahertz rank or more, drive loss is calculated；
Drive loss gives grid capacitance C from driving voltageGLoss caused by charge and discharge；Drive loss is
In formula, CGFor switching tube grid equivalent capacity；VDDFor mosfet driver supply voltage, f is the work of MOSFET
Frequency.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
4 realization includes：
AC resistance R when the resonance coil loss is from coil resonance resonanceACLoss,
RACCalculation formula is
In formula, RDCFor the D.C. resistance of coil itself, N11For effective number of plies of wire winding, AstrIt is effectively thick for foil conductor
The ratio between degree and effective skin depth, dsFor every strand diameter, tsFor two adjacent two strands centre-to-centre spacing of same layer；
According to antenna theory, energy loss by radiation is considered as to the loss of equivalent resistance；The equivalent resistance is denoted as radiation resistance
Rrad；The size of radiation resistance depends on size, shape and the wavelength by electric current of antenna；Therefore coil radiation resistance can
It is calculated as follows
(4.3)
In formula, r is coil radius, and n is coil turn, and h is coil width, and c is the light velocity, μrTo be inserted into the opposite magnetic of magnetic core
Conductance, ω are the frequency by coil current；
Therefore the loss that can obtain resonance coil is
Pcoil=I2(RAC+Rrad) (4.4)
In formula, I is the virtual value of coil current.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
5 realization includes：
The internal resistance of resonant capacitance is lost
In formula, ICTo flow through the virtual value of capacitance current.
In the inverter circuit multiple physical field analysis method being lost based on radio energy transmission system, the step
6 realization includes：
The high frequency full-bridge rectification loss includes the on-state loss P of rectifier diodeD-condAnd switching loss；
On-state loss is
Switching loss includes turn-on consumption PD-onWith turn-off power loss PD-off；
Turn-on consumption PD-onFor
Turn-off power loss PD-offFor
(6.3)
Due in a cycle, full-bridge rectification has 2 diode operations, therefore the loss P of high frequency full-bridge rectifierrectifier
For
Prectifier=2 (PD-cond+PD-on+PD-off) (6.4)。
The present invention is based on radio energy transmission system loss inverter circuit multiple physical field analysis method with magnetic resonance type without
Line electric energy transmission system is research object, carries out mathematical modeling to radio energy transmission system, analyzes model, pass through meter
System components loss is calculated, it is found out and the best part is lost.And multiple physical field modeling analysis is carried out to high-frequency inverter circuit, lead to
The coupling for crossing heat field and electric field obtains inverter circuit thermal profile, and optimizes cloth to inverter circuit on this basis
Office, to reduce device heat, ensures its stable long-term work.
Advantageous effect of the present invention：Each section of quantitative analysis radio energy transmission system is lost, and specifies the loss of its each section
Accounting helps to improve the transmission efficiency and output power of system, the promotion of design and efficiency to radio energy transmission system
With important reference significance.By to system components loss analysis, can optimization system integral layout and component select, make
System structure design is reasonable, parameter setting is reasonable, enhances the stability of system, improves wireless power transmission technology various aspects
Performance.Thermal design skill is carried out to high-frequency inverter circuit link the most serious of generating heat using the modeling of FInite Element multiple physical field simultaneously
Art research is optimized from its circuit layout, interior media and shell mechanism, reduces the node of inverter circuit main devices
Temperature improves the reliability of system safe and stable operation, extends service life.
Description of the drawings
Fig. 1 is the magnetic resonance type wireless energy transfer system equivalent-circuit model figure of one embodiment of the invention；
Fig. 2 is each link schematic diagram of system of one embodiment of the invention；
Fig. 3 is the full bridge inverter structure chart of one embodiment of the invention；
Fig. 4 is the rectifier circuit structure figure of one embodiment of the invention.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting is described, they are merely examples, and purpose is not
It is to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.This repetition be for
Simplify and clear purpose, the relationship between itself not indicating discussed various embodiments and/or being arranged.In addition, this hair
The bright example for providing various specific techniques and material, but those of ordinary skill in the art may realize that other techniques can
The use of application and/or other materials.In addition structure of the fisrt feature described below in the "upper" of second feature can wrap
The embodiment that the first and second features are formed as being in direct contact is included, the first and second spies can also be formed in including other feature
Embodiment between sign, such fisrt feature and second feature may not be to be in direct contact.
Technical solution used in the embodiment of the present invention, the inverter circuit multiple physical field based on radio energy transmission system loss
Analysis method includes the following steps：
1, mathematics model analysis is carried out to magnetic resonance type radio energy transmission system.Its specific implementation includes following sub-step
Suddenly：
1.1, the mathematical model of magnetic resonance type radio energy transmission system is initially set up, circuit model letter appropriate is carried out
Change；
1.2, magnetic resonance type radio energy transmission system model is analyzed by mode coupling theories, to magnetic resonance type without
The efficiency of transmission and output power Derivation of line electric energy transmission system；
1.3, magnetic resonance type radio energy transmission system model is analyzed by classical Circuit theory, is managed according to mutual inductance
By with Kirchhoff's theorem law, derive the efficiency of transmission of magnetic resonance type radio energy transmission system
In formula, P1For input power, P2For output power, M is the mutual inductance of coupling coil, and w is the resonance of coupling coil
Frequency, RLFor load resistance, ZPFor primary consumer, ZSFor secondary winding impedance.
2, the factor to influencing magnetic resonance type radio energy transmission system efficiency of transmission is analyzed, and determines itself and magnetic resonance
Relationship between radio energy transmission system efficiency of transmission.Its specific implementation includes following sub-step：
2.1, influence of the analysis-driven signal frequency to magnetic resonance radio energy transmission system efficiency of transmission, magnetic resonance without
Line electric energy transmission system actual design early period, it is to be understood that system task driven signal frequency is to magnetic resonance type wireless power transmission
The influence of system efficiency of transmission determines magnetic resonance type radio energy transmission system best operating point with this.
2.2, influence of the analysis coefficient of coup to magnetic resonance type radio energy transmission system efficiency of transmission, the coil coefficient of coup
K is mainly related with opposite placement position with primary and secondary coil relative distance.With the increase of coefficient of coup k, electric current with
The ratio of voltage starts paddy peak separating phenomenon occur, but magnetic resonance type radio energy transmission system efficiency of transmission maximum point is still
The resonant frequency point of system, electric current and voltage ratio are not maximum at this time, but are in bimodal median.
2.3, influence of the analysis load to magnetic resonance type radio energy transmission system efficiency of transmission.In Simplified analysis, only
Consider the system effectiveness under pure resistance working condition, is resistance by coil and resonance capacitor equivalent.
3, for high-frequency inverter circuit, quantitative calculating is carried out to device loss thereon.Specifically include following sub-step：
3.1, the general calculation formula of device loss is
In formula, U is the pressure drop on device, and I is the electric current flowed through on device, and D (t) is duty ratio.
3.2, MOSFET losses.
Its conduction loss calculation formula is
In formula, RDS(on) conducting resistance for being MOSFET；ID(on)For MOSFET conducting when drain current virtual value；ton
For turn-on time；F is the working frequency of MOSFET.
Its turn-on consumption calculation formula is
In formula, VDS(t) the drain-source voltage across poles for being MOSFET；iD(t) drain current for being MOSFET；tswitch-onFor
The opening process time of MOSFET；T is the work period of MOSFET.
Its turn-off power loss calculation formula is
In formula, tswitch-offFor the turn off process time of MOSFET.
In one cycle, a pair of of MOSFET works together, so the loss of MOSFET is in a cycle
PMOS=2 (PMOS-on+Pswitch-on+Pswitch-off) (3.5)
3.3, drive loss, when the driving frequency of system reaches megahertz rank or more, the driving of this when is made
At loss cannot often ignore.Drive loss is mainly that driving voltage gives grid capacitance CGLoss caused by charge and discharge,
It is represented by
In formula, CGFor switching tube grid equivalent capacity；VDDFor mosfet driver supply voltage, f is the work of MOSFET
Frequency.
4, resonance coil loss, AC resistance R when the loss of resonance coil is mainly derived from coil resonance resonanceACDamage
Consumption.RACCalculation formula is
In formula, RDCFor the D.C. resistance of coil itself, N11For effective number of plies of wire winding, AstrIt is effectively thick for foil conductor
The ratio between degree and effective skin depth (winding layers Approximate Equivalent foil conductor), dsFor every strand diameter, tsFor two adjacent two strand of same layer
Centre-to-centre spacing.
According to antenna theory, energy loss by radiation can be considered the loss of an equivalent resistance.The equivalent resistance is denoted as radiation
Resistance Rrad.The size of radiation resistance depends on size, shape and the wavelength by electric current of antenna.Therefore spiral winding spoke
Radio resistance can be calculated as follows
In formula, r is coil radius, and n is coil turn, and h is coil width, and c is the light velocity, μrTo be inserted into the opposite magnetic of magnetic core
Conductance, ω are the frequency by coil current.
Therefore the loss that can obtain resonance coil is
Pcoil=I2(RAC+Rrad) (4.4)
In formula, I is the virtual value of coil current.
5, resonant capacitance internal resistance loss, the internal resistance of resonant capacitance, which is lost, is
In formula, ICTo flow through the virtual value of capacitance current.
6, high frequency full-bridge rectification is lost mainly by the on-state loss P of rectifier diodeD-condWith switching loss two parts group
At.
Switching loss includes turn-on consumption PD-onWith turn-off power loss PD-off。
Due in a cycle, full-bridge rectification has 2 diode operations, therefore the loss P of high frequency full-bridge rectifierrectifier
For
Prectifier=2 (PD-cond+PD-on+PD-off) (6.4)
7, model analysis is carried out to high-frequency inverter circuit with 5.0 softwares of Comsol Multiphysics, obtains its heat
Distribution map, and compared with the result obtained by infrared detecting set, it is used in combination Comsol Multiphysics 5.0 to high-frequency inversion electricity
Road, which is laid out, to be optimized and revised, and to reduce the thermal coupling between its each device, reduces its bulk temperature.
The magnetic resonance type radio energy transmission system that the embodiment of the present invention is built with laboratory based on the above-mentioned technical proposal
For, the loss of its each section solve and multiple physical field modeling analysis is carried out to its high-frequency inverter circuit, specific steps are such as
Under：
S1, the equivalent-circuit model for establishing system, as shown in Figure 1.Each link relationship of system as shown in Fig. 2, be in experiment
System full bridge inverter structure chart used is as shown in figure 3, rectifier circuit structure figure is as shown in Figure 4.
S2, the loss of inverter circuit main devices is calculated, specific sub-step is as follows：
S2.1, MOSFET on-state loss, the waveform of drain current when the single MOSFET of actual measurement system is connected, and table look-up and know it
On state resistance is 0.48 Ω, therefore in one cycle, according to oscillogram, virtual value I is connected in itD(on)About 1.28A is led
Logical time tonAbout 960ns, working frequency f are 457.4KHz.Data above substitution formula 3.2 can be obtained into PMOS-onAbout
0.76W。
S2.2, switch mosfet loss, the calculating of related switching device loss both at home and abroad existing at present are most of all to adopt
Switching loss is obtained with the method operation of fitting.But this computational methods are the disadvantage is that voltage, electric current to opening, in turn off process
The description of waveform is not accurate enough, often there is the processing in approximation when calculating switching loss.
S2.3, drive loss, table look-up to obtain grid equivalent capacity CGFor 27pF, it is known that VDDIt is for 12V, switching frequency f
457.4K brings formula 3.6 into and calculates to obtain PdriveValue is 0.13W.
S2.4, inverter circuit total losses, it is 30V to test its known input voltage, and resonance input current is 1.66A, then its
Input terminal power is 50W, and test obtains its output voltage current waveform.
It is 24V that its output voltage virtual value, which can be obtained, and output current virtual value is 1.5A, then output power is that the two is multiplied,
Value 36W, in conjunction with input general power, it is 14W that can obtain inverter circuit plate total losses.
S3, resonance coil loss calculation build systematic parameter, effective number of plies N of wire winding according to laboratory11It is 1, often
Strand diameter dsFor 3mm, two adjacent two strands centre-to-centre spacing t of same layersIt is 20cm for 4mm, coil radius r, coil turn n is 19, line
It is 61mm to enclose width h, is inserted into the relative permeability μ of magnetic corerIt is 0, is 457.4KHz by the frequencies omega of coil current, by original
The virtual value I of winding current is 1.5A, and the virtual value I of secondary coil electric current is 1.109A, and data above is substituted into formula
4.1,4.2,4.3,4.4 primary coil loss P is obtainedcoilFor 8.2W, secondary coil loss is 2.8W.
S4, resonant capacitance internal resistance loss calculation, it is 1.5A, secondary side that experiment, which measures and flows through the virtual value I of primary side capacitance current,
The virtual value I of capacitance current is 1.109A, and the capacitance resistance of survey is 0.47 Ω, substitutes into formula 5.1 and then calculates to obtain primary side capacitance damage
Consumption is 1.05W, and secondary side capacity loss is 0.55W.
S5, high-frequency rectification circuit loss calculation, since actual measurement system is difficult to accurately determine the voltage current waveform of diode
Parameter, integral and calculating can cause very big error, and entire cowling panel also includes the loss of other components.Using measurement rectified current
Road both end voltage current waveform, so as to determine that the power of input/output terminal, the two subtract each other to obtain entire according to its virtual value
The loss of rectification circuit.Experiment measures cowling panel input voltage and input current waveform, and can obtain rectification circuit input voltage virtual value is
20V, input current virtual value are 1.109A, then the power that can obtain input rectifying plate is 22.18W.Measure again output DC voltage,
Electric current is respectively 18.1V, 1.107A, therefore output power is 20.03W, the two subtract each other cowling panel loss is 2.15W.Due to whole
Flowing plate output power all consumes on load circuit, therefore load loss power is 20.03W.
S6, multiple physical field modeling is carried out to inverter circuit.The physical parameter for modeling material therefor all derives from Comsol
Multiphysics carries the data in material depot.Component values are arranged, and are provided by real system parameter.
S7, to established model, carry out mesh generation, its heat can be obtained by Comsol Multiphysics softwares
Cloud charts.By thermal profile it is found that its maximum temperature reaches 80 °, it is unfavorable for device and effectively steadily works, therefore need to be to it
Layout is adjusted.
S8, adjusting device are laid out and carry out modeling and simulating, obtain new temperature profile.Inverter circuit after optimization,
Maximum temperature can reduce by 10 ° or so.
S9, inverter circuit shell is adjusted, the wall thickness of box body mainly influences the heat loss through conduction of inverter circuit, and shell
Fin height influence box surface heat loss through convection.Encapsulating inside inverter circuit, main heating device is taken to pass through heat conduction aluminum
Plate is connected with box case, the finned comprehensive cooling measure of box case, can be by the front stage MOSFET of inverter circuit, two
Pole pipe and driving resistance, the temperature of the high-temperature devices such as chip control within 60 DEG C.
An embodiment of the present invention provides the method for computing system each section loss and to the inverter circuit the most serious that generates heat
The method that part carries out multiple physical field analysis.The loss of magnetic resonance wireless energy transfer system each section can be specifically found out, and can
System structure is adjusted, system loss is reduced, improves the transmission efficiency of system, to the popularization of radio energy transmission system and
Using with theory value and practical significance.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although describing the specific implementation mode of the present invention above in association with attached drawing, those of ordinary skill in the art should
Understand, these are merely examples, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (5)
1. the inverter circuit multiple physical field analysis method based on radio energy transmission system loss, which is characterized in that the analysis
Method carries out mathematics using magnetic resonance type radio energy transmission system as research object, to magnetic resonance type radio energy transmission system and builds
Mould analyzes model, calculates the loss of magnetic resonance type radio energy transmission system each section, is carried out to high-frequency inverter circuit
Multiple physical field modeling analysis, to optimize layout；Include the following steps：
Step 1 carries out mathematics model analysis to magnetic resonance type radio energy transmission system；
Step 2, to influence magnetic resonance type radio energy transmission system efficiency of transmission factor analyze, and determine they between
Relationship；
Step 3, the quantitatively device loss on calculating high-frequency inverter circuit；
Step 4 calculates resonance coil loss；
Step 5 calculates resonant capacitance internal resistance loss；
Step 6 calculates the loss of high frequency full-bridge rectification；
Step 7 carries out model analysis using 5.0 softwares of Comsol Multiphysics to high-frequency inverter circuit, obtains its heat
Distribution map is measured, and compared with the result obtained by infrared detecting set, using Comsol Multiphysics 5.0 to high-frequency inversion
Circuit is laid out optimization, to reduce thermal coupling and the bulk temperature between each device；
The realization of the step 1 includes the following steps：
Step 1.1, the mathematical model for establishing magnetic resonance type radio energy transmission system, and simplify circuit model；
Step 1.2 analyzes magnetic resonance type radio energy transmission system model by mode coupling theories, Derivation transmission
Efficiency and output power；
Step 1.3 analyzes magnetic resonance type radio energy transmission system model by classical Circuit theory, is managed according to mutual inductance
By with Kirchhoff's theorem law, derive that efficiency of transmission is
In formula, P1For input power, P2For output power, M is the mutual inductance of coupling coil, and w is the resonance frequency of coupling coil
Rate, RLFor load resistance, ZPFor primary consumer, ZSFor secondary winding impedance；
The realization of the step 2 includes the following steps：
The influence of step 2.1, analysis task driven signal frequency to magnetic resonance type radio energy transmission system efficiency of transmission, with true
Determine magnetic resonance type radio energy transmission system best operating point；
The influence of step 2.2, the analysis coefficient of coup to magnetic resonance type radio energy transmission system efficiency of transmission；The coil coefficient of coup
K is related with primary coil, the relative distance of secondary coil and opposite placement position；With the increase of coil coefficient of coup k, electricity
The ratio of stream and voltage starts paddy peak separating phenomenon occur, and magnetic resonance type radio energy transmission system efficiency of transmission maximum point is should
The resonant frequency point of system, corresponding current are in bimodal median with voltage ratio；
The influence of step 2.3, analysis load to the efficiency of transmission；Only consider that the magnetic resonance type under pure resistance working condition is wireless
Coil and resonance capacitor equivalent are resistance by electric energy transmission system efficiency.
2. the inverter circuit multiple physical field analysis method according to claim 1 based on radio energy transmission system loss,
It is characterized in that, the realization of the step 3 includes the following steps：
The general calculation formula of step 3.1, device loss is
In formula, U is the pressure drop on device, and I is the electric current flowed through on device, and D (t) is duty ratio；
Step 3.2, MOSFET losses；
Its conduction loss calculation formula is
In formula, RDS(on) conducting resistance for being MOSFET；ID(on)For MOSFET conducting when drain current virtual value；tonTo lead
The logical time；F is the working frequency of MOSFET；
Its turn-on consumption calculation formula is
In formula, VDS(t)For the drain-source voltage across poles of MOSFET；iD(t) drain current for being MOSFET；
tswitch-onFor the opening process time of MOSFET；T is the work period of MOSFET；
Its turn-off power loss calculation formula is
In formula, tswitch-offFor the turn off process time of MOSFET；
In one cycle, a pair of of MOSFET works together, so the loss of MOSFET is in a cycle
PMOS=2 (PMOS-on+Pswitch-on+Pswitch-off) (3.5)；
Step 3.3, drive loss；
When the driving frequency of magnetic resonance type radio energy transmission system reaches megahertz rank or more, drive loss is calculated；Driving
Loss gives grid capacitance C from driving voltageGLoss caused by charge and discharge；Drive loss is
In formula, CGFor switching tube grid equivalent capacity；VDDFor mosfet driver supply voltage, f is the working frequency of MOSFET.
3. the inverter circuit multiple physical field analysis method according to claim 1 based on radio energy transmission system loss,
It is characterized in that, the realization of the step 4 includes：
AC resistance R when the resonance coil loss is from coil resonance resonanceACLoss,
RACCalculation formula is
In formula, RDCFor the D.C. resistance of coil itself, N11For effective number of plies of wire winding, AstrFor foil conductor effective thickness with
The ratio between effective skin depth, dsFor every strand diameter, tsFor two adjacent two strands centre-to-centre spacing of same layer；
According to antenna theory, energy loss by radiation is considered as to the loss of equivalent resistance；The equivalent resistance is denoted as radiation resistance Rrad；
The size of radiation resistance depends on size, shape and the wavelength by electric current of antenna；Therefore coil radiation resistance can be pressed
Formula calculates
In formula, r is coil radius, and n is coil turn, and h is coil width, and c is the light velocity, μrTo be inserted into the relative permeability of magnetic core,
ω is the frequency by coil current；
Therefore the loss that can obtain resonance coil is
Pcoil=I2(RAC+Rrad) (4.4)
In formula, I is the virtual value of coil current.
4. the inverter circuit multiple physical field analysis method according to claim 1 based on radio energy transmission system loss,
It is characterized in that, the realization of the step 5 includes：
The internal resistance of resonant capacitance is lost
In formula, ICTo flow through the virtual value of capacitance current.
5. the inverter circuit multiple physical field analysis method according to claim 1 based on radio energy transmission system loss,
It is characterized in that, the realization of the step 6 includes：
The high frequency full-bridge rectification loss includes the on-state loss P of rectifier diodeD-condAnd switching loss；
On-state loss is
Switching loss includes turn-on consumption PD-onWith turn-off power loss PD-off；
Turn-on consumption PD-onFor
Turn-off power loss PD-offFor
Due in a cycle, full-bridge rectification has 2 diode operations, therefore the loss P of high frequency full-bridge rectifierrectifierFor
Prectifier=2 (PD-cond+PD-on+PD-off) (6.4)。
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