CN109525111A - Impedance matching methods based on circuit switch frequency - Google Patents
Impedance matching methods based on circuit switch frequency Download PDFInfo
- Publication number
- CN109525111A CN109525111A CN201811203597.4A CN201811203597A CN109525111A CN 109525111 A CN109525111 A CN 109525111A CN 201811203597 A CN201811203597 A CN 201811203597A CN 109525111 A CN109525111 A CN 109525111A
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- Prior art keywords
- boost circuit
- boost
- load
- impedance
- mode
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The present invention relates to the impedance matching methods based on circuit switch frequency, belong to wireless power transmission field.For WPT system battery, equivalent load dynamic change causes system efficiency of transmission to decline problem during the charging process, using Boost circuit, impedance matching is realized by changing Boost circuit switching frequency, reduce the input equivalent impedance of primary side, increase reflected umpedance, coupling coil efficiency of transmission is improved, being suitable for load is big voltage low current, the biggish application of equivalent impedance.On the basis of obtaining impedance transformation relation of the Boost circuit under DCM mode and CCM mode, equivalent load can be made to maintain near optimal load by adjusting Boost switching frequency, to realize that maximal efficiency is transmitted.
Description
Technical field
The invention belongs to wireless power transmission fields, in particular to the impedance matching methods based on circuit switch frequency
Background technique
To in accumulator load charging process, battery equivalent load can change WPT system.The charging of battery
Journey can be divided into multiple constant-current charging phases.In each constant-current charging phase, the curved rising of battery both end voltage, therefore with
The progress of charging process, battery equivalent load RLIt is on the rise.It is optimal negative to make system equivalent load deviate
It carries, system efficiency of transmission is caused to decline.Therefore, when battery both ends equivalent load dynamic change, it is necessary to impedance matching is used,
Maintain the efficient electric energy transmission of WPT system.
In order to maintain the equivalent load value of primary side constant, this patent uses Boost circuit, by changing Boost
The switching frequency of booster circuit realizes impedance matching, reduces the input equivalent impedance of primary side, increases reflected umpedance, improves WPT
System efficiency of transmission, being suitable for load is big voltage low current, the biggish application of equivalent impedance.
Summary of the invention
In order to solve shortcoming and defect existing in the prior art, the present invention provides the impedances for improving efficiency of transmission
Matching process.
It is described the present invention provides the impedance matching methods based on circuit switch frequency in order to reach above-mentioned technical purpose
Method includes:
Using Boost impedance transformer, changes Boost impedance transformer switching frequency and realize impedance matching, determine equivalent
Relationship between load and Boost circuit switching frequency；
Boost circuit switching frequency is adjusted, maintains equivalent load near optimal load, realizes WPT system
Maximal efficiency transmission.
Optionally, which comprises
Boost impedance transformer has CCM mode and DCM mode, and the operating condition of both of which is
T=0 moment, Q conducting, input voltage V1The both ends energy storage inductor L are added to, diode VD is reversed cut-off, flows through electricity
Feel the electric current of L
Work as ton≤t≤ton+toffWhen, Q cut-off；Diode forward bias and be connected, power be stored in L
Energy is conveyed to load and filter capacitor by diode VD；
The voltage being added on inductance at this time is V1-Vout, flow through the electric current of inductance L
The increased electric current of energy storage inductor L is equal to the electric current of reduction during Q ends, such circuit ability during only Q is connected
Reach balance；
It can be obtained by upper two formula
Optionally, which comprises
When Boost circuit work in CCM mode, ton+toff=T, toff=(1-a) T can obtain Boost electricity under CCM mode
The input and output voltage relationship on road is
When Boost circuit work is in DCM mode, because having
Then in a cycle inductive current average value ILFor
The input current of Boost circuit is inductance average current I in a cycleL, then had according to law of conservation of energy
It can thus be concluded that the relationship under DCM mode between Boost circuit input and output voltage is
As it can be seen that output voltage is not only related to duty ratio a under DCM mode, also with inductance L, the working frequency f of metal-oxide-semiconductor and
Load resistance value RLIt is related；Assuming that Boost circuit does not have energy loss, then have
In conjunction with above-mentioned various, the input impedance R of Boost circuit under CCM and DCM mode can be obtained2Meet
Under CCM mode, be apparent from a increase, R2Reduce；
Under DCM mode, λ=α is enabled2/Lf
At this time
In RLIn the case where certain, R2It is only related with λ；
Have to six derivation of formula
From the above equation, we can see that R under DCM mode2For the monotonic decreasing function about λ, reducing f can reduce R2。
Technical solution provided by the invention has the benefit that
Maintain equivalent load near optimal load by adjusting Boost switching frequency, to realize that maximal efficiency passes
It is defeated.Working frequency f by adjusting metal-oxide-semiconductor in Boost impedance transformer can maintain R2It is basically unchanged, thus systems stabilisation
Efficiency of transmission.If but the changed power that load needs, it can be by changing input voltage VinChange bearing power.Therefore, it uses
Impedance matching may be implemented in Boost circuit regulating switch frequency, stablizes WPT system efficiency of transmission, and it is big for being suitable for load
The biggish application of voltage low current, equivalent impedance.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the WPT system basic block diagram comprising Boost impedance transformer；
Fig. 2 (a) is the inductive current waveform that Boost impedance transformer works in ccm mode；
Fig. 2 (b) is that Boost impedance transformer works in the inductive current waveform of CCMDCM mode；
Fig. 3 is WPT system control block diagram under the conditions of varying load；
Fig. 4 (a) is R under DCM state2In different RLUnder value；
Fig. 4 (b) is to guarantee R2It is constant, in different RLUnder corresponding frequency values.
Specific embodiment
To keep structure and advantage of the invention clearer, structure of the invention is made further below in conjunction with attached drawing
Description.
Embodiment one
In order to stablize system effectiveness in optimal value, realize be suitable for load be big voltage low current, equivalent impedance compared with
The impedance matching of big application, the present invention provides one kind to realize WPT system most by changing Boost circuit switching frequency
The impedance matching methods of big efficiency transmission.
Referring to attached drawing 1, Boost circuit as shown in the figure is added between the rectifier bridge and load of IPT system.Boost impedance
There are two types of basic working modes, i.e. CCM mode and DCM mode for converter.The operating condition of both of which is
Referring to attached drawing 2, it is shown that inductive current waveform of the Boost impedance transformer work in CCM and DCM mode.T=
0 moment, Q conducting, input voltage V1The both ends energy storage inductor L are added to, diode VD is reversed cut-off, flows through the electric current of inductance L
Work as ton≤t≤ton+toffWhen, Q cut-off.Diode forward bias and be connected, power be stored in L
Energy is conveyed to load and filter capacitor by diode VD.The voltage being added on inductance at this time is V1-Vout, flow through inductance L
Electric current
Obviously, (t during only Q conductingonIt is interior) the increased electric current of energy storage inductor L be equal to Q cut-off during (toffIt is interior) reduce
Electric current, such circuit can be only achieved balance.It can be obtained by upper two formula
When Boost circuit work is in CCM mode, by Fig. 2 (a) it is found that ton+toff=T, toff=(1-a) T, can obtain
The input and output voltage relationship of Boost circuit is under CCM mode
When Boost circuit work is in DCM mode, because having
Then in a cycle inductive current average value ILFor
The input current of Boost circuit is inductance average current I in a cycleL, then had according to law of conservation of energy
It can thus be concluded that the relationship under DCM mode between Boost circuit input and output voltage is
As it can be seen that output voltage is not only related to duty ratio a under DCM mode, also with inductance L, the working frequency f of metal-oxide-semiconductor and
Load resistance value RLIt is related.Assuming that Boost circuit does not have energy loss, then have
In conjunction with above-mentioned various, the input impedance R of Boost circuit under CCM and DCM mode can be obtained2Meet
Under CCM mode, be apparent from a increase, R2Reduce.Under DCM mode, enable
λ=α2/Lf
At this time
In RLIn the case where certain, R2It is only related with λ.Have to above formula derivation
From the above equation, we can see that R under DCM mode2For the monotonic decreasing function about λ, reducing f can reduce R2。
Working frequency f by adjusting Boost impedance transformer metal-oxide-semiconductor can maintain R2It is basically unchanged, it can be with stability series
The efficiency of transmission of system.Referring to attached drawing 3, if but load the changed power needed, it can pass through and change input voltage VinChange load
Power.Load RLController is by the voltage V in load when variationoutWith electric current IoutAmplitude sampling, computational load impedance, and according to
Load RLSize adjust f, make R2Constant, if the changed power that load needs, controller adjusts input voltage Vin.Herein
The effect of Boost impedance transformer is not the function of adjusting output voltage, but play impedance transformation, adjusts output voltage
Task is realized by primary side power supply.
Indicating that frequency is 50kHz referring to attached drawing 4 (a) red line, inductance L is 100uH, under the conditions of duty cycle alpha is 0.3, R2With RL
Situation of change, which can be divided into two stages: under CCM state, with RLIncrease, R2It is linearly increasing.In DCM state
Under, if not changing frequency, R2With RLIt is slowly increased.To guarantee that system carries out regulated power transmission, during loading increased,
Wish R2Stablize constant in optimal load value.Work as RLWhen variation, according to the curve setting f, R in Fig. 4 (b)2Size see Fig. 4 (a)
Middle blue line.Known by Fig. 4, control R can be realized by regulating switch frequency2Purpose, to reach the mesh of stable efficiency of transmission
's.
The present invention provides the impedance matching methods based on circuit switch frequency, be deduced Boost circuit in CCM and
Impedance transformation relation under DCM mode maintains equivalent load near optimal load by adjusting Boost switching frequency, from
And it realizes maximal efficiency and transmits.Working frequency f by adjusting metal-oxide-semiconductor in Boost can maintain R2It is basically unchanged, from
And the efficiency of transmission of systems stabilisation.If but the changed power that load needs, it can be by changing input voltage VinChange load function
Rate.Therefore, impedance matching may be implemented using Boost circuit regulating switch frequency, stablizes WPT system efficiency of transmission, fit
It is big voltage low current, the biggish application of equivalent impedance for loading.
Each serial number in above-described embodiment is for illustration only, the assembling for not representing each component or the elder generation in use process
Sequence afterwards.
The above description is only an embodiment of the present invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (3)
1. the impedance matching methods based on circuit switch frequency, which is characterized in that the described method includes:
Using Boost impedance transformer, changes Boost impedance transformer switching frequency and realize impedance matching, determine equivalent load
With the relationship between Boost circuit switching frequency；
Boost circuit switching frequency is adjusted, maintains equivalent load near optimal load, realizes that WPT system is maximum
Efficiency transmission.
2. the impedance matching methods according to claim 1 based on circuit switch frequency, which is characterized in that the method packet
It includes:
Boost impedance transformer has CCM mode and DCM mode, and the operating condition of both of which is
T=0 moment, Q conducting, input voltage V1The both ends energy storage inductor L are added to, diode VD is reversed cut-off, flows through inductance L's
Electric current
Work as ton≤t≤ton+toffWhen, Q cut-off；Diode forward is biased and is connected, and power and the energy being stored in L are logical
It crosses diode VD and is conveyed to load and filter capacitor；
The voltage being added on inductance at this time is V1-Vout, flow through the electric current of inductance L
The increased electric current of energy storage inductor L is equal to the electric current of reduction during Q ends during only Q is connected, and such circuit can be only achieved
Balance；
It can be obtained by upper two formula
3. the impedance matching methods according to claim 2 based on circuit switch frequency, which is characterized in that the method packet
It includes:
When Boost circuit work in CCM mode, ton+toff=T, toff=(1-a) T, can obtain Boost circuit under CCM mode
Input and output voltage relationship is
When Boost circuit work is in DCM mode, because having
Then in a cycle inductive current average value ILFor
The input current of Boost circuit is inductance average current I in a cycleL, then had according to law of conservation of energy
It can thus be concluded that the relationship under DCM mode between Boost circuit input and output voltage is
As it can be seen that output voltage is not only related to duty ratio a under DCM mode, also with inductance L, the working frequency f of metal-oxide-semiconductor and load
Resistance value RLIt is related；Assuming that Boost circuit does not have energy loss, then have
In conjunction with above-mentioned various, the input impedance R of Boost circuit under CCM and DCM mode can be obtained2Meet
Under CCM mode, be apparent from a increase, R2Reduce；
Under DCM mode, λ=α is enabled2/Lf
At this time
In RLIn the case where certain, R2It is only related with λ；
Have to six derivation of formula
From the above equation, we can see that R under DCM mode2For the monotonic decreasing function about λ, reducing f can reduce R2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811203597.4A CN109525111A (en) | 2018-10-16 | 2018-10-16 | Impedance matching methods based on circuit switch frequency |
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| CN201811203597.4A CN109525111A (en) | 2018-10-16 | 2018-10-16 | Impedance matching methods based on circuit switch frequency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350449A (en) * | 2020-10-22 | 2021-02-09 | 清华大学深圳国际研究生院 | Wireless energy transmission system and method |
| CN112994442A (en) * | 2021-02-08 | 2021-06-18 | 哈尔滨工业大学 | Improved method of capacitor filter bridge type uncontrolled rectifier |
| CN112994446A (en) * | 2021-02-08 | 2021-06-18 | 哈尔滨工业大学 | Improvement method of LC filter bridge type uncontrolled rectifying circuit |
Citations (1)
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| CN102437776A (en) * | 2011-12-27 | 2012-05-02 | 东南大学 | Piezoelectric energy trapping device |
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2018
- 2018-10-16 CN CN201811203597.4A patent/CN109525111A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437776A (en) * | 2011-12-27 | 2012-05-02 | 东南大学 | Piezoelectric energy trapping device |
Non-Patent Citations (2)
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| 田壁源，刘琪: ""基于复合控制策略的全局优化MPPT算法研究"", 《电工技术》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350449A (en) * | 2020-10-22 | 2021-02-09 | 清华大学深圳国际研究生院 | Wireless energy transmission system and method |
| CN112994442A (en) * | 2021-02-08 | 2021-06-18 | 哈尔滨工业大学 | Improved method of capacitor filter bridge type uncontrolled rectifier |
| CN112994446A (en) * | 2021-02-08 | 2021-06-18 | 哈尔滨工业大学 | Improvement method of LC filter bridge type uncontrolled rectifying circuit |
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Application publication date: 20190326 |