CN105429313B - A kind of control method of the changeable radio energy transmission system of resonance compensation topology - Google Patents
A kind of control method of the changeable radio energy transmission system of resonance compensation topology Download PDFInfo
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Abstract
The invention discloses a kind of changeable radio energy transmission system of resonance compensation topology and its control method, the system to include dc source, high-frequency inversion mechanism, primary side compensation mechanism, electromagnetic coupling mechanisms, secondary switching mechanism, high-frequency rectification mechanism, load, primary-side-control mechanism and secondary controlling organization；It is characterized in that：The difference that power supply characteristic or power efficiency output according to needed for load require, by controlling turning on and off for two-way switch in secondary switching mechanism to carry out topological structure switching, system can be operated in constant current output, constant pressure output and high-power high-efficiency respectively and export three kinds of mode of operations.Advantage：The system can require that flexible switching system mode of operation effectively overcomes the limitation of single resonance compensation topology, widened system application scenario so as to meet the power reguirements of all kinds load in power supply characteristic or power efficiency output according to needed for load supplying.
Description
Technical field
The present invention relates to a kind of new radio energy transmission system, and in particular to a kind of resonance compensation topology is changeable
Radio energy transmission system and its control method.
Background technology
In view of the advantages such as safe and convenient possessed by wireless power transmission technology, accommodative ability of environment is strong, become at present
The hot research topic of field of power electronics, its theoretical system is also in continuous development and perfection.It is wherein induction wireless
Electric energy transmission technology is with the fastest developing speed, using also the most extensively, it utilizes high frequency magnetic field transmission energy in magnetic path, from
And realize primary side transmitting terminal and the physical isolation at secondary pickup end.
It can be seen that the magnetic path of radio energy transmission system is the core of wireless power transmission technology, its coefficient of coup
Size also directly affects the characteristics such as output voltage, power output and the efficiency of transmission of whole radio energy transmission system.And magnetic circuit
The primary side transmitting terminal separated in mechanism is a kind of loose coupling magnetic structure with secondary pickup end, and big with leakage inductance, magnetizing inductance is small,
The shortcomings of coefficient of coup is small, therefore in order to realize the maximization of system capacity transmission, reduce the reactive power of whole system, typically
Need to compensate former secondary coil inductance, therefore the resonance compensation mode of radio energy transmission system becomes radio energy
The research emphasis of transmission technology.
At present, common radio energy transmission system resonance compensation topology can be divided into four by the collocation structure difference of former secondary
The basic compensation topology of kind, it is respectively：String/string compensation（SS）Topology, serial/parallel compensation（SP）Topology, parallel/serial compensation（PS）Topology,
And/and compensate（PP）Topology, more than in addition to four kinds of basic compensation topologies, also the New Topological such as LCL, LCC, SSP is topological.This
A little compensation topologies have respective characteristic and advantage and opened up, it is necessary to choose a kind of most suitable compensation according to the difference of application environment
Flutter.
Above-mentioned various resonance compensations topology is made a general survey of, LCL compensation topologies can lead primary side due to it by parameter designing
Rail constant current, therefore the primary side resonance compensation structure of radio energy transmission system is widely used in, and S or P compensation topologies are due to it
It is simple in construction, energy-storage travelling wave tube is few, so being often used as the secondary resonance compensation structure of radio energy transmission system.And LCL-S with
The characteristic that the radio energy transmission system that two kinds of collocation structures of LCL-P are formed is shown differs widely, and wherein LCL-S systems are fitted
Share in the load for needing constant pressure source to power, and LCL-P systems are suitable for needing the load of constant current source power supply.Or when load
When value is smaller, the power output and efficiency of transmission of LCL-S systems are higher compared with LCL-P systems, and when load value is larger, LCL-P
The power output and efficiency of transmission of system are compared with LCL-S systems advantageously.So when power supply characteristic or power needed for load
When efficiency output requires different, the radio energy transmission system of single resonance compensation topology cannot meet its application scenario, mesh
It is preceding also to be invented both at home and abroad without the research that improve this case.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of changeable wireless power transmission system of resonance compensation topology
System and its control method, power supply characteristic or power efficiency output it can be required according to needed for load supplying, flexible switching system
Mode of operation provides electric energy for it, effectively optimizes its power and efficiency, system is operated in high-power high-efficiency state, so as to
Meet the power reguirements of all kinds load, effectively overcome the limitation of single resonance compensation topology, widened system applied field
Close.
To achieve the above object, the present invention uses following technical scheme：A kind of changeable radio of resonance compensation topology
Energy Transmission system, it is characterized in that：The system includes dc source, high-frequency inversion mechanism, primary side compensation mechanism, electromagnetic coupled machine
Structure, secondary switching mechanism, high-frequency rectification mechanism, load, primary-side-control mechanism and secondary controlling organization；Wherein dc source is by city
The rectified filtering of electricity obtains；Half-bridge, full-bridge or push-pull inverter may be selected in high-frequency inversion mechanism；Primary side compensation mechanism is selected
LCL compensation topologies；Electromagnetic coupling mechanisms are loose coupling magnetic structure；Primary-side-control mechanism is by primary controller and drive circuit structure
Into secondary controlling organization is made up of detection module, secondary controller, drive circuit, wherein primary controller and secondary controller
DSP, FPGA, ARM single-chip microcomputer etc. can be selected, detection module is connected with system output, can detect the size of load value, driving electricity
It route light-coupled isolation and power amplification two parts circuit is formed.
A kind of changeable radio energy transmission system of described resonance compensation topology, it is characterised in that：Primary side compensates machine
Structure is LCL（It is T-shaped）Structure, secondary switching mechanism is by series compensation capacitanceC S1One two-way switch S of parallel connection1And Shunt compensation capacitorC S2Connect a two-way switch S2Form, wherein described two-way switch is two power switch pipe differential concatenations；Secondary controls
Mechanism is by controlling S1、S2Turn on and off, radio energy transmission system is carried out in two kinds of different resonance compensation topologys
Switching, two kinds of resonance compensation topologys that can mutually switch are respectively：LCL-S compensation topologies and LCL-P compensation topologies.
A kind of control method of the changeable radio energy transmission system of described resonance compensation topology, it is characterised in that：
By detecting the difference of load supplying power supply characteristic, make system high in constant current output, constant pressure output and high power
Efficiency exports to be switched in three kinds of mode of operations, to meet the power reguirements of all kinds load.
（1）When the necessary constant current source power supply of system load requirement, switching tube S is made1And S2It is simultaneously open-minded, switch to system
LCL-P compensation topologies carry out constant current-supplying mode of operation to load.
（2）When system load needs necessary constant pressure source power supply, switching tube S is made1And S2Simultaneously turn off, switch to system
LCL-S compensation topologies carry out constant pressure powered operation pattern to load.
（3）When system load can use constant current source power supply that constant pressure source can be used to power again, it is defeated to pay the utmost attention to its
Go out power and efficiency, detecting system loadR L, limit value be presentR X, load resistanceR L≤R XWhen, make switching tube S1And S2Simultaneously turn off,
System is set to switch to its power output and efficiency of transmission in the state of LCL-S compensation topologies higher；Load resistanceR L>R XWhen, order is opened
Close pipe S1And S2It is simultaneously open-minded, system is switched to its power output and efficiency of transmission in the state of LCL-P compensation topologies higher,
So that system is operated under the mode of operation of high-power high-efficiency.
Beneficial effect
The present invention is because using above-mentioned technical proposal, it has the advantage that as follows：Can the power supply according to needed for load supplying it is special
Property or power efficiency output require that the flexible corresponding mode of operation of switching system provides electric energy for it, effectively optimize its power
And efficiency, system is operated in high-power high-efficiency state, so as to meet the power reguirements of all kinds load, effectively overcome
The limitation of single resonance compensation topology, has widened system application scenario.
（1）When the necessary constant current source power supply of system load requirement, switching tube S is made1And S2It is simultaneously open-minded, switch to system
LCL-P compensation topologies carry out constant current-supplying mode of operation to load.Such as：LED, constant-current charging of battery period etc.
（2）When system load needs necessary constant pressure source power supply, switching tube S is made1And S2Simultaneously turn off, switch to system
LCL-S compensation topologies carry out constant pressure powered operation pattern to load.Such as：Motor, electric light, battery constant-voltage charge period etc.
（3）When system load can use constant current source power supply that constant pressure source can be used to power again, it is defeated to pay the utmost attention to its
Go out power and efficiency, detecting system loadR L, limit value be presentR X, load resistanceR L≤R XWhen, make switching tube S1And S2Simultaneously turn off,
System is set to switch to its power output and efficiency of transmission in the state of LCL-S compensation topologies higher；Load resistanceR L>R XWhen, order is opened
Close pipe S1And S2It is simultaneously open-minded, system is switched to its power output and efficiency of transmission in the state of LCL-P compensation topologies higher,
So that system is operated under the mode of operation of high-power high-efficiency.Such as：Warmer, electric blanket etc.
Brief description of the drawings
Fig. 1 is present system main circuit structure figure
In figure, 1, dc source；2nd, high-frequency inversion mechanism；3rd, primary side compensation mechanism；4th, electromagnetic coupling mechanisms；5th, secondary is cut
Converting mechanism；6th, rectifying and wave-filtering mechanism；7th, load；8th, primary-side-control mechanism；9th, secondary controlling organization
Fig. 2 is switch S1、S2Present system switches to the main circuit diagram of LCL-S compensation topologies when simultaneously turning off
Fig. 3 is switch S1、S2Present system switches to the main circuit diagram of LCL-P compensation topologies when opening simultaneously
Fig. 4 is that present system main circuit simplifies process analysis procedure analysis figure
Fig. 5 is the graph of a relation between the output voltage that present system is operated under LCL-S topologys and system load
Fig. 6 is the graph of a relation between the output current that present system is operated under LCL-P topologys and system load
Graphs of a relation of the Fig. 7 between present system power output and efficiency of transmission and system load
Fig. 8 is present system workflow diagram
Embodiment
In order that the purpose of the present invention, the content of the invention and beneficial effect are clearer, below in conjunction with accompanying drawing to the present invention
It is described in further detail：
Referring to Fig. 1, Fig. 1 show present system structural representation, and present system includes dc source 1, and high frequency is inverse
Become mechanism 2, primary side compensation mechanism 3, electromagnetic coupling mechanisms 4, secondary switching mechanism 5, rectifying and wave-filtering mechanism 6, load 7, primary side control
Mechanism 8 processed and secondary controlling organization 9.
Described dc sourceU inIt can be obtained by the rectified filtering of civil power, DC voltage also can be used directly and be powered.
Half-bridge, full-bridge or push-pull inverter may be selected in described high-frequency inversion mechanism, and the present invention uses four power
Switching tube G1-G4Form H bridge high-frequency inverters.
Described primary side compensation mechanism selects LCL compensation topologies, and its composition includes：Primary side compensates inductanceLaCompensated with primary side
Electric capacityC P, wherein primary compensation capacitorC PWith primary side transmitting coil inductanceL PAfter parallel connection inductance is being compensated with primary sideLaSeries connection, form
LCL resonance compensation networks.L a 、C PWithL PMeet following relation：
（1）
WhereinωIt is system resonance frequencies.
Described electromagnetic coupling mechanisms include：Primary side transmitting coilL PWith secondary pick-up windingL S, form loosely coupled transformer
Structure.
Described secondary switching mechanism includes：Secondary series compensation capacitanceC S1, switching switch S in parallel1, secondary shunt compensation
Electric capacityC S2Switch switch S with series connection2, wherein secondary series compensation capacitanceC S1A power switch tube S in parallel1Mended afterwards with parallel
Repay electric capacityC S2One power switch tube S of series connection2Collectively constitute secondary switching mechanism.C S1、C S2With secondary pick-up winding inductanceL SIt is full
The following relation of foot：
（2）
Described rectifying and wave-filtering mechanism includes：Four fast recovery diode D1-D4And filter capacitorC 1。
Described load is system loadR L。
Described primary-side-control mechanism is made up of primary controller and drive circuit, the wherein optional DSP of primary controller,
FPGA, ARM single-chip microcomputer etc.；Detection module is connected with system output, can detect load supplying power supply characteristic and load resistance
Size；Drive circuit is made up of light-coupled isolation and power amplification two parts circuit.
Described secondary controlling organization is made up of secondary controlling organization detection module, secondary controller and drive circuit,
Wherein DSP, FPGA, ARM single-chip microcomputer etc. can be selected in secondary controller；Drive circuit is by light-coupled isolation and power amplification two parts electricity
Road is formed.
Referring to Fig. 2, Fig. 3, wherein Fig. 2 is to switch S in present system secondary switching mechanism1、S2Main electricity when simultaneously turning off
Lu Tu, now the structure of present system is LCL-S compensation topologies；Fig. 3 is to be switched in present system secondary switching mechanism
S1、S2Main circuit diagram when opening simultaneously, now the structure of present system is LCL-P compensation topologies.
Referring to Fig. 4, Fig. 4 show present system main circuit Simplified analysis figure, and LCL resonance compensation networks are used in primary side
In the case of, analyze and calculate by process simplification as shown in Figure 4, primary side guide rail is understood by Norton equivalent lawL PMiddle electric current is：
（3）
WhereinωIt is system resonance frequencies,U inIt is direct current power source voltage, by formula（3）It is apparent from primary side guide railL PMiddle electric current is permanent
It is fixed.
When ignoring secondary coil internal resistance, the impedance that primary side is reflexed under LCL-S and LCL-P compensation topologies is respectively：
（4）
WhereinMIt is the mutual inductance of primary side transmitting coil and secondary pick-up winding.
By a series of circuit reduction processes of Fig. 4, the output voltage under LCL-S compensation topologies can be obtainedU outMended with LCL-P
Repay the output current under topologyI outRespectively：
（5）
（6）
In systemω、L a 、M、L SFor definite value, by formula（3）, formula（5）And formula（6）Understand, when the load, as long as given
System input voltageU in, other specification is immutable after system determination, it is not necessary to increases the control circuit of complexity, it is possible to real
It is existing：As shown in figure 5, when the system load varies, the output voltage under LCL-S compensation topologies is constant, can be seen for load
As constant pressure source；As shown in fig. 6, when the system load varies, the constant output current under LCL-P compensation topologies, for load
For can see constant-current source as.
Further analyze and can be calculated system output power and efficiency of transmission is respectively：
（7）
（8）
By above theory analysis, and it is defeated to rationally design the system that parameter can be obtained under LCL-S and LCL-P compensation topologies
Go out powerPOut and efficiency of transmissionηWith system loadR LBetween relation curve referring to Fig. 7.
Fig. 7 show the graph of a relation between present system power output and efficiency of transmission and system load, is born with system
CarryR LFor variable, simultaneous formula（7）System output power under middle LCL-S and LCL-P compensation topologies obtains：R L=R X1；Similarly with system
LoadR LFor variable, simultaneous formula（8）System efficiency of transmission under middle LCL-S and LCL-P compensation topologies obtains：R L=R X2.Such as Fig. 7 institutes
Show, if load limit valueR X, it is easy to get：R X=R X1=R X2, switching point when as system requirements high-power high-efficiency exports, when load electricity
ResistanceR L≤R XWhen, the system output power and efficiency of transmission under LCL-S compensation topology states are higher；Work as load resistanceR L>R XWhen,
System output power and efficiency of transmission under LCL-P compensation topology states is higher.
Referring to Fig. 8, Fig. 8 show present system workflow diagram, and present system is further illustrated with reference to Fig. 8
Workflow, upper electricity is initial, switching tube S1、S2Simultaneously turn off, system is operated in LCL-S resonance topological states, according to load institute
Power supply characteristic is needed, when the necessary constant current source power supply of system load requirement, system is switched to pattern one, makes switching tube S1And S2
It is simultaneously open-minded, system is switched to LCL-P compensation topologies and constant current-supplying mode of operation is carried out to load.When system load needs must
During palpus constant pressure source power supply, system is switched to pattern two, makes switching tube S1And S2Simultaneously turn off, system is switched to LCL-S compensation and open up
Flutter and constant pressure powered operation pattern is carried out to load.When again system load can be supplied using constant current source power supply using constant pressure source
When electric, system is switched to pattern three, pays the utmost attention to its power output and efficiency, and detection module detecting system first loadsR L, deposit
In limit valueR X, work as load resistanceR L≤R XWhen, make switching tube S1And S2Simultaneously turn off, system is switched to LCL-S compensation topologies
Its power output and efficiency of transmission are higher under state；Work as load resistanceR L>R XWhen, make switching tube S1And S2It is simultaneously open-minded, make system
It is higher to switch to its power output and efficiency of transmission in the state of LCL-P compensation topologies, so that system is operated in high power height
Under the mode of operation of efficiency.
Claims (1)
1. a kind of control method of the changeable radio energy transmission system of resonance compensation topology, it is characterized in that：The system includes
Dc source (1), high-frequency inversion mechanism (2), primary side compensation mechanism (3), electromagnetic coupling mechanisms (4), secondary switching mechanism (5),
Rectifying and wave-filtering mechanism (6), load (7), primary-side-control mechanism (8) and secondary controlling organization (9), primary side compensation mechanism (3) are LCL
Structure, secondary switching mechanism (5) is by series compensation capacitance CS1One two-way switch S of parallel connection1Afterwards, then with Shunt compensation capacitor CS2With
One two-way switch S2It is in series, wherein described two-way switch S1With two-way switch S2It is all reverse for two power switch pipes
It is composed in series；Secondary controlling organization (9) is by controlling S1、S2Turn on and off, make radio energy transmission system in two kinds of differences
Resonance compensation topology on switch over, two kinds of resonance compensation topologys that can mutually switch are respectively：LCL-S compensation topologies and
LCL-P compensation topologies, the control method comprise the following steps：
The difference that power supply characteristic or power efficiency output according to needed for load require, makes system defeated in constant current output, constant pressure
Go out and high-power high-efficiency is exported and switched in three kinds of mode of operations, to meet the power reguirements of load：(1) when system is born
When load requires necessary constant current source power supply, switching tube S is made1And S2It is simultaneously open-minded, system is switched to LCL-P compensation topologies to load
Carry out constant current-supplying mode of operation；(2) when system load needs necessary constant pressure source power supply, switching tube S is made1And S2Simultaneously turn off,
System is switched to LCL-S compensation topologies and constant pressure powered operation pattern is carried out to load；(3) when system load can use perseverance
The power supply of stream source can use constant pressure source power supply again when, its power output and efficiency, detecting system load R are paid the utmost attention toL, limit be present
Value RX, load resistance RL≤RXWhen, make switching tube S1And S2Simultaneously turn off, system is switched in the state of LCL-S compensation topologies
Its power output and efficiency of transmission are higher；Load resistance RL>RXWhen, make switching tube S1And S2It is simultaneously open-minded, switch to system
Its power output and efficiency of transmission are higher in the state of LCL-P compensation topologies, so that system is operated in high-power high-efficiency
Under mode of operation.
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| CN105429313A (en) | 2016-03-23 |
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