CN105429313A - Wireless electric energy transmission system with switchable resonance compensation topology and control method thereof - Google Patents
Wireless electric energy transmission system with switchable resonance compensation topology and control method thereof Download PDFInfo
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Abstract
The invention discloses a wireless electric energy transmission system with a switchable resonance compensation topology and a control method thereof. The system comprises a direct current power supply, a high frequency inversion mechanism, a primary side compensation mechanism, an electromagnetic coupling mechanism, a secondary side switching mechanism, a high frequency rectification mechanism, a load, a primary side control mechanism and a secondary side control mechanism. The system is characterized in that according to a power supply characteristic needed by a load or difference of power efficiency output requirements, through controlling connection and disconnection of a bidirectional switch in the secondary side switching mechanism, topology structure switching is performed; and the system can work in three kinds of working modes which are constant current output, constant voltage output and high power and high efficiency output. The system has advantages that the system can flexibly switch system working modules according to the power supply characteristic needed by load power supply or a power efficiency output requirement so as to satisfy power supply requirements of various types of loads; single resonance compensation topology restrictions are effectively overcome and a system application occasion is widened.
Description
Technical field
The present invention relates to a kind of novel radio energy transmission system, be specifically related to a kind of resonance compensation switchable radio energy transmission system of topology and control method thereof.
Background technology
In view of safe, convenient, the advantage such as accommodative ability of environment is strong that wireless power transmission technology has, become the popular research topic of current field of power electronics, its theoretical system is also in continuous development and perfection.Wherein induction wireless power transmission technical development is the rapidest, and application is also extensive, and it utilizes high frequency magnetic field transmitting energy in magnetic path, thus realizes former edge emitting end and secondary picks up the physical isolation of holding.
Visible, the magnetic path of radio energy transmission system is the core of wireless power transmission technology, and the size of its coupling coefficient also directly affects the characteristics such as the output voltage of whole radio energy transmission system, power output and efficiency of transmission.And the former edge emitting end be separated in magnetic path and secondary pick up end is a kind of loose coupling magnetic structure, there is leakage inductance large, magnetizing inductance is little, the shortcomings such as coupling coefficient is little, therefore in order to realize the maximization of system capacity transmission, reduce the reactive power of whole system, generally need to compensate former secondary coil inductance, therefore the resonance compensation mode of radio energy transmission system becomes the research emphasis of wireless power transmission technology.
At present, common radio energy transmission system resonance compensation topology can be divided into four kinds of basic compensation topology by the collocation structure difference of former secondary, be respectively: string/string compensates (SS) topology, serial/parallel compensation (SP) topology, parallel/serial compensation (PS) topology, and compensate (PP) topology, except above four kinds of basic compensation topology, also have the New Topological topologys such as LCL, LCC, SSP.These compensation topology have respective characteristic and advantage, need to choose a kind of optimal compensation topology according to the difference of applied environment.
Make a general survey of above-mentioned various resonance compensation topologys, LCL compensation topology can make the guide rail constant current of former limit by parameter designing due to it, therefore be widely used in the former limit resonance compensation structure of radio energy transmission system, and S or P compensation topology is because its structure is simple, energy-storage travelling wave tube is few, so be often used as the secondary resonance compensation structure of radio energy transmission system.And the characteristic that the radio energy transmission system that LCL-S and LCL-P two kinds of collocation structures are formed shows differs widely, wherein LCL-S system is suitable for the load that needs constant pressure source to power, and LCL-P system is suitable for the load needing constant current source power supply.Or when load value is less, comparatively LCL-P system is higher for the power output of LCL-S system and efficiency of transmission, and when load value is larger, comparatively LCL-S system is advantageously for the power output of LCL-P system and efficiency of transmission.So when power supply characteristic needed for load or power efficiency export requirement difference, the radio energy transmission system of single resonance compensation topology just can not meet its application scenario, there is no the research invention that can improve this situation at present both at home and abroad yet.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of resonance compensation switchable radio energy transmission system of topology and control method thereof, requirement can be exported according to power supply characteristic needed for load supplying or power efficiency, switched system mode of operation provides electric energy for it flexibly, its power of effective optimization and efficiency, make system works in high-power high-efficiency state, thus meet the power reguirements of all kinds load, effectively overcome the restriction of single resonance compensation topology, widen system application scenario.
For achieving the above object, the present invention is by the following technical solutions: the switchable radio energy transmission system of a kind of resonance compensation topology, is characterized in that: this system comprises DC power supply, high-frequency inversion mechanism, former limit compensation mechanism, electromagnetic coupling mechanisms, secondary switching mechanism, high-frequency rectification mechanism, load, former limit controlling organization and secondary controlling organization; Wherein DC power supply is obtained through rectifying and wave-filtering by civil power; Half-bridge, full-bridge or push-pull inverter can be selected by high-frequency inversion mechanism; Former limit compensation mechanism selects LCL compensation topology; Electromagnetic coupling mechanisms is loose coupling magnetic structure; Former limit controlling organization is made up of former limit controller and drive circuit, secondary controlling organization is made up of detection module, secondary controller, drive circuit, its limit, Central Plains controller and secondary controller can select DSP, FPGA, ARM single-chip microcomputer etc., detection module is connected with system output, can detect the size of load value, drive circuit is made up of light-coupled isolation and power amplification two parts circuit.
The described switchable radio energy transmission system of a kind of resonance compensation topology, is characterized in that: former limit compensation mechanism is LCL(T type) structure, secondary switching mechanism is by series compensation capacitance C
s1a bidirectional switch S in parallel
1with Shunt compensation capacitor C
s2connect a bidirectional switch S
2form, wherein said bidirectional switch is two power switch pipe differential concatenations; Secondary controlling organization is by control S
1, S
2turn on and off, radio energy transmission system is switched in two kinds of different resonance compensation topologys, and two kinds of resonance compensation topologys that can mutually switch are respectively: LCL-S compensation topology and LCL-P compensation topology.
The control method of the described switchable radio energy transmission system of a kind of resonance compensation topology, is characterized in that:
By detecting the difference of load supplying power supply characteristic, system being exported in three kinds of mode of operations at constant current output, constant voltage output and high-power high-efficiency and switches, to meet the power reguirements of all kinds load.
(1) when system load requires necessary constant current source power supply, switching tube S is made
1and S
2simultaneously open-minded, make systematic evaluation carry out constant current-supplying mode of operation to LCL-P compensation topology to load.
(2) when system load need must constant pressure source power time, make switching tube S
1and S
2turn off simultaneously, make systematic evaluation carry out constant voltage powered operation pattern to LCL-S compensation topology to load.
Not only (3) when system load can use constant current source power supply but also constant pressure source can be used to power, its power output and efficiency is paid the utmost attention to, detection system load R
l, there is limit value R
x, load resistance R
l≤ R
xtime, make switching tube S
1and S
2turn off simultaneously, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-S compensation topology higher; Load resistance R
l>R
xtime, make switching tube S
1and S
2simultaneously open-minded, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-P compensation topology higher, thus make system works under the mode of operation of high-power high-efficiency.
Beneficial effect
The present invention is owing to adopting technique scheme, it is as follows that it has advantage: can export requirement according to power supply characteristic needed for load supplying or power efficiency, the corresponding mode of operation of flexible switched system provides electric energy for it, its power of effective optimization and efficiency, make system works in high-power high-efficiency state, thus meet the power reguirements of all kinds load, effectively overcome the restriction of single resonance compensation topology, widen system application scenario.
(1) when system load requires necessary constant current source power supply, switching tube S is made
1and S
2simultaneously open-minded, make systematic evaluation carry out constant current-supplying mode of operation to LCL-P compensation topology to load.Such as: LED, constant-current charging of battery period etc.
(2) when system load need must constant pressure source power time, make switching tube S
1and S
2turn off simultaneously, make systematic evaluation carry out constant voltage powered operation pattern to LCL-S compensation topology to load.Such as: motor, electric light, battery constant voltage charge period etc.
Not only (3) when system load can use constant current source power supply but also constant pressure source can be used to power, its power output and efficiency is paid the utmost attention to, detection system load R
l, there is limit value R
x, load resistance R
l≤ R
xtime, make switching tube S
1and S
2turn off simultaneously, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-S compensation topology higher; Load resistance R
l>R
xtime, make switching tube S
1and S
2simultaneously open-minded, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-P compensation topology higher, thus make system works under the mode of operation of high-power high-efficiency.Such as: warmer, electric blanket etc.
Accompanying drawing explanation
Fig. 1 is present system main circuit structure figure
In figure, 1, DC power supply; 2, high-frequency inversion mechanism; 3, former limit compensation mechanism; 4, electromagnetic coupling mechanisms; 5, secondary switching mechanism; 6, rectifying and wave-filtering mechanism; 7, load; 8, former limit controlling organization; 9, secondary controlling organization
Fig. 2 is switch S
1, S
2when turning off, present system switches to the main circuit diagram of LCL-S compensation topology simultaneously
Fig. 3 is switch S
1, S
2when opening, present system switches to the main circuit diagram of LCL-P compensation topology simultaneously
Fig. 4 is that present system main circuit simplifies process analysis procedure analysis figure
Fig. 5 is the graph of a relation that present system is operated between output voltage under LCL-S topology and system load
Fig. 6 is the graph of a relation that present system is operated between output current under LCL-P topology and system load
Fig. 7 is present system power output and the graph of a relation between efficiency of transmission and system load
Fig. 8 is present system workflow diagram
Embodiment
In order to make object of the present invention, summary of the invention and beneficial effect clearly, below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1, Figure 1 shows that present system structural representation, present system comprises DC power supply 1, high-frequency inversion mechanism 2, former limit compensation mechanism 3, electromagnetic coupling mechanisms 4, secondary switching mechanism 5, rectifying and wave-filtering mechanism 6, load 7, former limit controlling organization 8 and secondary controlling organization 9.
Described DC power supply U
incan be obtained through rectifying and wave-filtering by civil power, also can directly use direct voltage to power.
Half-bridge, full-bridge or push-pull inverter can be selected by described high-frequency inversion mechanism, and the present invention uses four power switch pipe G
1-G
4composition H bridge high-frequency inverter.
Described former limit compensation mechanism selects LCL compensation topology, and its composition comprises: former limit compensating inductance La and former limit building-out capacitor C
p, its limit, Central Plains building-out capacitor C
pwith former edge emitting coil inductance L
pconnecting with former limit compensating inductance La after parallel connection, forming LCL resonance compensation network.L
a, C
pand L
pmeet following relation:
（1）
Wherein ω is system resonance frequencies.
Described electromagnetic coupling mechanisms comprises: former edge emitting coil L
pwith secondary pick-up winding L
s, form loosely coupled transformer structure.
Described secondary switching mechanism comprises: secondary series compensation capacitance C
s1, diverter switch S in parallel
1, secondary Shunt compensation capacitor C
s2with series connection diverter switch S
2, wherein secondary series compensation capacitance C
s1a power switch tube S in parallel
1after with Shunt compensation capacitor C
s2to connect a power switch tube S
2common composition secondary switching mechanism.C
s1, C
s2with secondary pick-up winding inductance L
smeet following relation:
（2）
Described rectifying and wave-filtering mechanism comprises: four fast recovery diode D
1-D
4with filter capacitor C
1.
Described load is system load R
l.
Described former limit controlling organization is made up of former limit controller and drive circuit, and its limit, Central Plains controller can select DSP, 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 detection module, secondary controller and drive circuit secondary controlling organization, and wherein secondary controller can select DSP, FPGA, ARM single-chip microcomputer etc.; Drive circuit is made up of light-coupled isolation and power amplification two parts circuit.
See Fig. 2, Fig. 3, wherein Fig. 2 is present system secondary switching mechanism breaker in middle S
1, S
2main circuit diagram when simultaneously turning off, now the structure of present system is for being LCL-S compensation topology; Fig. 3 is present system secondary switching mechanism breaker in middle S
1, S
2main circuit diagram when simultaneously opening, now the structure of present system is for being LCL-P compensation topology.
See Fig. 4, Figure 4 shows that present system main circuit Simplified analysis figure, under former limit adopts LCL resonance compensation network condition, by process simplification analysis and calculation as shown in Figure 4, by the known former limit guide rail L of Norton equivalent law
pmiddle electric current is:
（3）
Wherein ω is system resonance frequencies, U
inbe direct current power source voltage, easily know former limit guide rail L by formula (3)
pmiddle current constant.
When ignoring secondary coil internal resistance, the impedance reflexing to former limit under LCL-S and LCL-P compensation topology is respectively:
（4）
Wherein M is the mutual inductance of former edge emitting coil and secondary pick-up winding.
By a series of circuit reduction process of Fig. 4, the output voltage U under LCL-S compensation topology can be obtained
outwith the output current I under LCL-P compensation topology
outbe respectively:
（5）
（6）
ω, L in system
a, M, L
sfor definite value, from formula (3), formula (5) and formula (6), when the load, as long as give fixed system input voltage U
in, other parameters are immutable after system is determined, not needing increases complicated control circuit, and just can realize: as shown in Figure 5, when the system load varies, the output voltage under LCL-S compensation topology is constant, can see constant pressure source as load; As shown in Figure 6, when the system load varies, the constant output current under LCL-P compensation topology, can see constant-current source as load.
Further analysis and calculation can obtain system output power and efficiency of transmission is respectively:
（7）
（8）
Through above theory analysis, and appropriate design parameter can obtain system output power Pout under LCL-S and LCL-P compensation topology and efficiency of transmission η and system load R
lbetween relation curve see Fig. 7.
Figure 7 shows that present system power output and the graph of a relation between efficiency of transmission and system load, with system load R
lfor variable, the system output power in simultaneous formula (7) under LCL-S and LCL-P compensation topology obtains: R
l=R
x1; In like manner with system load R
lfor variable, the system transfers efficiency in simultaneous formula (8) under LCL-S and LCL-P compensation topology obtains: R
l=R
x2.As shown in Figure 7, if load limit value R
x, be easy to get: R
x=R
x1=R
x2, be switching point when system requirements high-power high-efficiency exports, as load resistance R
l≤ R
xtime, the system output power under LCL-S compensation topology state and efficiency of transmission higher; As load resistance R
l>R
xtime, the system output power under LCL-P compensation topology state and efficiency of transmission higher.
See Fig. 8, Figure 8 shows that present system workflow diagram, further illustrate the workflow of present system below in conjunction with Fig. 8, power on initial, switching tube S
1, S
2turn off, system works is in LCL-S resonance topological state, and power supply characteristic needed for load, when system load requires necessary constant current source power supply, systematic evaluation, to pattern one, makes switching tube S simultaneously
1and S
2simultaneously open-minded, make systematic evaluation carry out constant current-supplying mode of operation to LCL-P compensation topology to load.When system load need must constant pressure source power time, systematic evaluation, to pattern two, makes switching tube S
1and S
2turn off simultaneously, make systematic evaluation carry out constant voltage powered operation pattern to LCL-S compensation topology to load.Not only when system load can use constant current source power supply but also constant pressure source can be used to power, systematic evaluation, to pattern three, pays the utmost attention to its power output and efficiency, first detection module detection system load R
l, there is limit value R
x, as load resistance R
l≤ R
xtime, make switching tube S
1and S
2turn off simultaneously, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-S compensation topology higher; As load resistance R
l>R
xtime, make switching tube S
1and S
2simultaneously open-minded, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-P compensation topology higher, thus make system works under the mode of operation of high-power high-efficiency.
Claims (3)
1. the switchable radio energy transmission system of resonance compensation topology, is characterized in that: this system comprises DC power supply 1, high-frequency inversion mechanism 2, former limit compensation mechanism 3, electromagnetic coupling mechanisms 4, secondary switching mechanism 5, rectifying and wave-filtering mechanism 6, load 7, former limit controlling organization 8 and secondary controlling organization 9.
2. the switchable radio energy transmission system of a kind of resonance compensation topology according to claim 1, is characterized in that: former limit compensation mechanism 3 is LCL(T type) structure, secondary switching mechanism 5 is by series compensation capacitance C
s1a bidirectional switch S in parallel
1after, then with Shunt compensation capacitor C
s2with a bidirectional switch S
2in series, wherein said bidirectional switch is two power switch pipe differential concatenations; Secondary controlling organization 9 is by control S
1, S
2turn on and off, radio energy transmission system is switched in two kinds of different resonance compensation topologys, and two kinds of resonance compensation topologys that can mutually switch are respectively: LCL-S compensation topology and LCL-P compensation topology.
3. according to claim 1, the control method of the switchable radio energy transmission system of a kind of resonance compensation topology described in 2, it is characterized in that: needed for load, power supply characteristic or power efficiency export the difference required, system is exported in three kinds of mode of operations at constant current output, constant voltage output and high-power high-efficiency switch, to meet the power reguirements of load: (1), when system load requires necessary constant current source power supply, makes switching tube S
1and S
2simultaneously open-minded, make systematic evaluation carry out constant current-supplying mode of operation to LCL-P compensation topology to load; (2) when system load need must constant pressure source power time, make switching tube S
1and S
2turn off simultaneously, make systematic evaluation carry out constant voltage powered operation pattern to LCL-S compensation topology to load; Not only (3) when system load can use constant current source power supply but also constant pressure source can be used to power, its power output and efficiency is paid the utmost attention to, detection system load R
l, there is limit value R
x, load resistance R
l≤ R
xtime, make switching tube S
1and S
2turn off simultaneously, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-S compensation topology higher; Load resistance R
l>R
xtime, make switching tube S
1and S
2simultaneously open-minded, make its power output and efficiency of transmission under systematic evaluation to the state of LCL-P compensation topology higher, thus make system works under the mode of operation of high-power high-efficiency.
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