CN208767856U - A kind of radio energy transmission system - Google Patents
A kind of radio energy transmission system Download PDFInfo
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- CN208767856U CN208767856U CN201820553054.4U CN201820553054U CN208767856U CN 208767856 U CN208767856 U CN 208767856U CN 201820553054 U CN201820553054 U CN 201820553054U CN 208767856 U CN208767856 U CN 208767856U
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Abstract
It further include with primary side winding N the utility model discloses a kind of radio energy transmission system, including start-up circuit, driving circuit, transmitting terminal impedance matching circuit and transmitting coilP1, the first vice-side winding NS1With the second vice-side winding NS2Pulse transformer T1；The driving circuit is from driving power half-bridge resonance circuit comprising the first circuit and second circuit of phase strict orthogonal；The start-up circuit accesses the primary side winding NP1, two vice-side windings are connected to the first circuit and second circuit；The capacitance terminal of the transmitting terminal impedance matching circuit is also attached to the pulse transformer T1Primary side winding NP1, powerful wireless power transmission occasion, increases the safety of electrical equipment it is suitable in, reduces the cost of product, greatly widens the application of wireless power transmission technology.
Description
Technical field
The utility model relates to wireless power transmission technical field more particularly to a kind of radio energy transmission systems.
Background technique
In recent years, all kinds of electronic electric equipments have obtained quickly universal and have developed, and the safety that user transmits electric energy
It is put forward new requirements with reliability.For the plug-in electric energy transmission technology of tradition in charging, there are the peaces such as spark and high pressure electric shock
Full hidden danger so that security of system, reliability and service life reduce, and is even difficult to reach some special industry occasions
Safety requirements.Wireless power transmission technology has been exactly to make up a kind of these electric energy that are insufficient and being inquired into and studied extensively and pass
Transferring technology.
Current wireless charging technology is radio wave technologies, electromagnetic induction technology and mr techniques by the way of.
Radio wave technologies are the radio wave energies returned by capturing wall rebound, but the charging modes efficiency is relatively low, application
The effect of anticipation is also much not achieved to the wireless charging device of existing market.And electromagnetic induction is used on wireless charging device
One-to-one electric energy transmission can be achieved in technology substantially, but which needs to be electrically charged equipment and is precisely directed at transmitting coil ability in fact
It now charges, and its transmission range is also relatively short, above various drawbacks cause wireless charging device to be in bottleneck period.With it is preceding
What two kinds of charging modes differences were is that mr techniques refer to that frequency between transmitting coil and receiving coil is consistent and can transmit electricity
Can, good improvement can be obtained apart from short disadvantage, but it controls its resonance frequency relative difficult.
Utility model content
The purpose of this utility model is to provide a kind of radio energy transmission systems, break through the limitation of above-mentioned mr techniques
Property, using distance mr techniques more excellent, more adaptable, overcome driving circuit design complexity under high frequency, use is positive and negative
Feedback, as novel main topology, makes the powerful wireless power transmission occasion it is suitable in from driving power half-bridge resonance circuit,
The safety for increasing electrical equipment reduces the cost of product, greatly widens the application of wireless power transmission technology.
For this purpose, the utility model uses following technical scheme:
A kind of radio energy transmission system, including start-up circuit, driving circuit, transmitting terminal impedance matching circuit and emission lines
Circle；
It further include with primary side winding NP1, the first vice-side winding NS1With the second vice-side winding NS2Pulse transformer T1,
The driving circuit is from driving power half-bridge resonance circuit comprising the first mutually orthogonal circuit of phase and the
Two circuits；
The start-up circuit accesses the primary side winding NP1, two vice-side windings are connected to the first circuit and
Two circuits；
The capacitance terminal of the transmitting terminal impedance matching circuit is also attached to the pulse transformer T1Primary side winding NP1, make
It obtains the driving circuit and maintains persistent oscillation process.
Optionally, the first vice-side winding NS1With the second vice-side winding NS2Both end voltage amplitude is equal, phase phase
Instead.
Optionally, the transmitting terminal impedance matching circuit is LCL resonance structure.
Optionally, first circuit includes the first metal-oxide-semiconductor Q1, the first vice-side winding NS1Both ends be connected to
The first metal-oxide-semiconductor Q1Grid and source electrode.
Optionally, first circuit further include for the first vice-side winding NS1Second capacitor C of resonance2, clipping it is steady
Second diode D of pressure2With third diode D3, the second capacitor C2It is parallel to the first vice-side winding NS1, described second
Diode D2With third diode D3The first vice-side winding N is parallel to after series connectionS1。
Optionally, the second circuit includes the second metal-oxide-semiconductor Q2, the second vice-side winding NS2Both ends be connected to
The second metal-oxide-semiconductor Q2Grid and source electrode.
Optionally, the second circuit further include for the second vice-side winding NS2The third capacitor C of resonance3, clipping it is steady
4th diode D of pressure4With the 5th diode D5, the third capacitor C3It is parallel to the second vice-side winding NS2, the described 4th
Diode D4With the 5th diode D5The second vice-side winding N is parallel to after series connectionS2。
Optionally, the transmitting terminal impedance matching circuit includes concatenated 5th capacitor C5With the 9th capacitor C9, the described 5th
Capacitor C5With the 9th capacitor C9It is parallel to transmitting coil, the 5th capacitor C5With the 9th capacitor C9Between connecting pin be also connected with
There is the tenth capacitor C10, the tenth capacitor C10Also it is in series with the 11st capacitor C11, the 11st capacitor C11Be also attached to the primary side around
Group NP1。
Optionally, the start-up circuit includes DC voltage source VDC, first resistor R1, second resistance R2, first capacitor C1、
6th diode D6With two-way trigger tube D1；
The DC voltage source VDCCathode ground connection, the DC voltage source VDCAnode be connected to first resistor R1?
One end, first resistor R1Second end be connected to second resistance R2First end, second resistance R2Second end be connected to first electricity
Hold C1First end, first capacitor C1Second end ground connection, two-way trigger tube D1First end be connected to first capacitor C1First
End, two-way trigger tube D1Second end be connected to primary side winding NP1First end, primary side winding NP1Second end ground connection；
First circuit includes and the first vice-side winding NS1Second capacitor C of resonance2, clipping pressure stabilizing the second diode
D2, third diode D3With the first metal-oxide-semiconductor Q1；
First vice-side winding NS1First end be connected to the second capacitor C2First end, the second diode D2First end and
First metal-oxide-semiconductor Q1Grid, the first vice-side winding NS1Second end be connected to the second capacitor C2Second end, third diode D3
Second end and the first metal-oxide-semiconductor Q1Source electrode, the second diode D2Second end and third diode D3First end polarity it is opposite
And it is connected；
The second circuit includes and the second vice-side winding NS2The third capacitor C of resonance3, clipping pressure stabilizing the 4th diode
D4, the 5th diode D5With the second metal-oxide-semiconductor Q2；
Second vice-side winding NS2First end be connected to third capacitor C3First end, the 4th diode D4First end and
Second metal-oxide-semiconductor Q2Grid, the second vice-side winding NS2Second end be connected to third capacitor C3Second end, the 5th diode D5
Second end and the second metal-oxide-semiconductor Q2Source electrode, the 4th diode D4Second end and the 5th diode D5First end polarity it is opposite
And it is connected；
6th diode D6First end be connected to first resistor R1Second end, the 6th diode D6Second end connection
In the first metal-oxide-semiconductor Q1Source electrode and the second metal-oxide-semiconductor Q2Drain electrode；
First metal-oxide-semiconductor Q1Drain electrode be connected to first resistor R1First end；
First vice-side winding NS1With the second vice-side winding NS2Both end voltage amplitude is equal, opposite in phase；
Transmitting terminal impedance matching circuit includes the first inductance L1, the 5th capacitor C5, the 6th capacitor C6, the 9th capacitor C9With
12 capacitor C12；
First metal-oxide-semiconductor Q1Source electrode be connected to the 12nd capacitor C12First end, the 12nd capacitor C12Second end connection
In the first inductance L1First end, the first inductance L1Second end be connected to the 5th capacitor C5First end and the 6th capacitor C6's
First end, the 5th capacitor C5Second end be connected to the 9th capacitor C9First end, the 9th capacitor C9Second end be connected to
Two metal-oxide-semiconductor Q2Source electrode, the 9th capacitor C9Second end be also grounded；
The both ends of transmitting coil are connected to the 6th capacitor C6Second end and the 9th capacitor C9Second end；
5th capacitor C5Second end and two-way trigger tube D1Second end between be also connected with the tenth capacitor being serially connected
C10With the 11st capacitor C11。
Optionally, which further includes receiving-end impedance match circuit, the receiving-end impedance matching
Circuit includes receiving coil and the 7th capacitor C7, the first end of the receiving coil is connected to the 7th capacitor C7First end, the 7th
Capacitor C7Second end be connected to the first end of load, the second end of load is connected to the second end of receiving coil, the of load
Two ends are also grounded.
The utility model embodiment has the advantages that
It is compared to existing technologies, new using being used as from driving power half-bridge resonance circuit in the utility model embodiment
The main topology of type, the capacitance terminal of transmitting terminal impedance matching circuit are also attached to the primary side winding N of pulse transformerP1, so that from driving
Power half-bridge resonance circuit maintains persistent oscillation process, makes the powerful wireless power transmission occasion it is suitable in, increases
The safety of electrical equipment reduces the cost of product, greatly widens the application of wireless power transmission technology.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of AB class wireless power transmission circuit structure diagram that the prior art provides.
Fig. 2 is equivalent structure figure inside switch mosfet pipe.
Fig. 3 is the functional block diagram of radio energy transmission system provided by the embodiment of the utility model.
The procedure chart of energizing of Fig. 4 radio energy transmission system provided by the embodiment of the utility model.
Fig. 5 is the circuit diagram of radio energy transmission system provided by the embodiment of the utility model.
Fig. 6 is the work bandwidth figure of radio energy transmission system provided by the embodiment of the utility model.
Specific embodiment
It, below will knot to enable the purpose of utility model, feature, advantage of the utility model more obvious and understandable
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only the utility model a part of the embodiment, and not all embodiment.Based on this reality
It is obtained by those of ordinary skill in the art without making creative efforts all other with the embodiment in novel
Embodiment is fallen within the protection scope of the utility model.
Referring to Fig. 1, Fig. 1 is a kind of AB class wireless power transmission circuit structure diagram that the prior art provides.
Wherein, 74HC240 is 8 tunnel tri-state reverse buffers.
However after the analysis prior art, finding it, there are following three points disadvantages:
One, adaptability is not strong, and transmitting coil will be strictly aligned with receiving coil, can be only achieved best electric energy transmission effect
Fruit；
Two, the magnetic resonance structure is suitable only for small-power occasion, and transmitting terminal is increased using multistage LC resonance structure
The complexity of system design and the difficulty of debugging；
Three, the bandwidth of metal-oxide-semiconductor work is very narrow, very sensitive to resonance point, and due to using crystal oscillator and inverter buffer
The driving method combined, driving voltage is not high, only 5V or so, therefore metal-oxide-semiconductor work causes in the unit time in amplification region
Relatively large by the electric current of metal-oxide-semiconductor, generated power consumption is consequently increased, and in longer time, metal-oxide-semiconductor can obviously be sent out
It scalds, or even can have the case where burning MOS pipe.
Therefore, the utility model can make in radio energy transmission system using from driving power half-bridge resonance circuit
Radio energy transmission system is applied to middle large-power occasions.For driving from the metal-oxide-semiconductor in driving power half-bridge resonance circuit
There are two types of modes for control: first is that the separate excitation drive control mode of additional crystal oscillator or IC, second is that self-excited driving control mode.
The design process of separately driven circuit is more complicated, increases design difficulty and cost.And it from driving control mode, is needing electricity
The driving signal of needs can be obtained by certain transformation into driving circuit for some signal feedback in road.And drive certainly
Oscillatory process is affected by the parasitic parameter inside metal-oxide-semiconductor, if the drain-source electrode capacitance inside metal-oxide-semiconductor and miller capacitance are relatively
When big, power half-bridge resonance circuit is larger from driving self-oscillating difficulty at this time.
The utility model influences switching process by dissecting metal-oxide-semiconductor internal structure in detail, studying its endophyte parameter
Faint positive feedback signal is introduced into pulse transformer, in turn by working mechanism from the capacitance terminal of transmitting terminal impedance matching circuit
The persistent oscillation process from driving power half-bridge resonance circuit is maintained, effective control of power half-bridge resonance circuit is better achieved
System.In order to which the frequency range for keeping power device applicable is wider, for the first time by a special positive feedback high frequency from driving power half-bridge
Resonance circuit is applied to wireless power transmission field, and a kind of parasitic parameter using inside metal-oxide-semiconductor and outside proposed is faint
The circuit that positive feedback signal is produced from driving oscillation control mode is simple, stable and reliable.
It please refers to shown in Fig. 2, Fig. 2 is equivalent structure figure inside switch mosfet pipe.
Its endophyte parameter differences is bigger between different metal-oxide-semiconductors, when parasitic capacitance parameter is relatively large, from driving
The driving oscillation circuit of power half-bridge resonance circuit is not easy starting of oscillation, it is difficult to realize driving certainly for power half-bridge.In order to solve this
Problem, the power half-bridge resonance combined using metal-oxide-semiconductor inner parameter with faint external positive feedback in the utility model
Circuit not only simplifies circuit, improves power half-bridge resonance circuit adaptability, but also reduce design cost.
In addition, metal-oxide-semiconductor endophyte parameter value is comparatively small, it is easy to structure and sets the resonance structure of high frequency to improve intrinsic
Frequency makes switching frequency reach MHz or more.Since the phase of down tube input circuit on power half-bridge resonance circuit is strict orthogonal
Relationship, therefore, the mutual conduction of down tube just completes the process of primary " drawing " and " filling " on power half-bridge, forms the defeated of power
Out, so that the input terminal for impedance matching provides a high frequency square wave, the frequency of square wave depends on internal feed self-oscillation parameter
Design.
In addition, the impedance matching of the radio energy transmission system of the utility model is divided into two parts: transmitting terminal impedance matching
Circuit and receiving-end impedance match circuit.In the entire system, impedance matching circuit is played to hold in electric energy transmission process and be opened
Under effect, for transmitting terminal impedance matching circuit, its main function is that the electric energy that is inputted power supply is series-parallel by LC
Resonance is converted into the high frequency voltage and current signal of target, is loaded into transmitting coil and then efficiently launches.Pass through conjunction
The working frequency of system, can slightly be staggered, to widen wireless energy by the design transmitting terminal two-stage impedance matching resonance frequency point of reason
The work bandwidth of system improves its reliability and adaptability.
On the other hand, for receiving-end impedance match circuit, by rationally designing the inductance value and size of receiving coil, and
Matched capacitance parameter is reasonably selected, receiving end can be made to obtain more preferably high frequency voltage in the resonance range of target
With current signal, and then sufficient power output is provided to load.
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
It please refers to shown in Fig. 3, Fig. 3 is the functional block diagram of radio energy transmission system provided by the embodiment of the utility model.
The radio energy transmission system includes alternating current 10, active power factor correction circuit 20, start-up circuit 30, self-powered
Dynamic power half-bridge resonance circuit 40, transmitting terminal impedance matching circuit 50, transmitting coil 60, receiving coil 70, receiving-end impedance
With circuit 80, load 90 and faint positive-feedback circuit 100.
Specifically, please referring to shown in Fig. 4 and Fig. 5.
In order to preferably describe circuit structure, the left end of element or upper end are defined as first end, the right end of element or
Person lower end is defined as second end.
The radio energy transmission system further includes with primary side winding NP1, the first vice-side winding NS1With the second vice-side winding
NS2Pulse transformer T1, include the first circuit and second circuit of quadrature in phase from driving power half-bridge resonance circuit 40.
Start-up circuit 30 accesses primary side winding NP1, two vice-side windings are connected to the first circuit and second circuit.
Further, the capacitance terminal of transmitting terminal impedance matching circuit 50 is also attached to pulse transformer T1Primary side winding
NP1, so that maintaining persistent oscillation process from driving power half-bridge resonance circuit 40.First vice-side winding NS1With the second vice-side winding
NS2Both end voltage amplitude is equal, opposite in phase.
Further, transmitting terminal impedance matching circuit 50 is LCL resonance structure.
Further, start-up circuit 30 includes DC voltage source VDC, first resistor R1, second resistance R2, first capacitor C1、
6th diode D6With two-way trigger tube D1。
DC voltage source VDCCathode ground connection, DC voltage source VDCAnode be connected to first resistor R1First end,
One resistance R1Second end be connected to second resistance R2First end, second resistance R2Second end be connected to first capacitor C1's
First end, first capacitor C1Second end ground connection, two-way trigger tube D1First end be connected to first capacitor C1First end, it is double
To triggering pipe D1Second end be connected to primary side winding NP1First end, primary side winding NP1Second end ground connection.
First circuit includes the first metal-oxide-semiconductor Q1And the first vice-side winding NS1Second capacitor C of resonance2, clipping pressure stabilizing
Two diode D2With third diode D3。
First vice-side winding NS1First end be connected to the second capacitor C2First end, the second diode D2First end and
First metal-oxide-semiconductor Q1Grid, the first vice-side winding NS1Second end be connected to the second capacitor C2Second end, third diode D3
Second end and the first metal-oxide-semiconductor Q1Source electrode, the second diode D2Second end and third diode D3First end polarity it is opposite
And it is connected.
Second circuit includes the second metal-oxide-semiconductor Q2And the second vice-side winding NS2The third capacitor C of resonance3, clipping pressure stabilizing
Four diode D4With the 5th diode D5。
Second vice-side winding NS2First end be connected to third capacitor C3First end, the 4th diode D4First end and
Second metal-oxide-semiconductor Q2Grid, the second vice-side winding NS2Second end be connected to third capacitor C3Second end, the 5th diode D5
Second end and the second metal-oxide-semiconductor Q2Source electrode, the 4th diode D4Second end and the 5th diode D5First end polarity it is opposite
And it is connected.
6th diode D6First end be connected to first resistor R1Second end, the 6th diode D6Second end connection
In the first metal-oxide-semiconductor Q1Source electrode and the second metal-oxide-semiconductor Q2Drain electrode.
First metal-oxide-semiconductor Q1Drain electrode be connected to first resistor R1First end.
First vice-side winding NS1With the second vice-side winding NS2Both end voltage amplitude is equal, opposite in phase.
Transmitting terminal impedance matching circuit 50 includes the first inductance L1, the 5th capacitor C5, the 6th capacitor C6, the 9th capacitor C9With
12nd capacitor C12。
First metal-oxide-semiconductor Q1Source electrode be connected to the 12nd capacitor C12First end, the 12nd capacitor C12Second end connection
In the first inductance L1First end, the first inductance L1Second end be connected to the 5th capacitor C5First end and the 6th capacitor C6's
First end, the 5th capacitor C5Second end be connected to the 9th capacitor C9First end, the 9th capacitor C9Second end be connected to
Two metal-oxide-semiconductor Q2Source electrode, the 9th capacitor C9Second end be also grounded.
The both ends of transmitting coil 60 are connected to the 6th capacitor C6Second end and the 9th capacitor C9Second end.
5th capacitor C5Second end and two-way trigger tube D1Second end between be also connected with the tenth capacitor being serially connected
C10With the 11st capacitor C11, so that maintaining persistent oscillation process from driving power half-bridge resonance circuit 40.
The radio energy transmission system further includes receiving-end impedance match circuit 80, and receiving-end impedance match circuit 80 includes
Receiving coil and the 7th capacitor C7, the first end of receiving coil is connected to the 7th capacitor C7First end, the 7th capacitor C7Second
End is connected to the first end of load, and the second end of load is connected to the second end of receiving coil, and the second end of load is also grounded.
Further, the work for analyzing radio energy transmission system provided by the embodiment of the utility model in detail below is former
Reason.
The working principle of start-up circuit 30 are as follows:
DC voltage source VDCPass through first resistor R1With second resistance R2To first capacitor C1It charges, first capacitor C1
The voltage at both ends is begun to ramp up, as first capacitor C1The voltage V at both endsC1Higher than two-way trigger tube D1Forward breakover voltage VBO
When, original single pulse signal excitation pulse transformer T can be generated1Primary side.Therefore primary side winding NP1Quickly generate one on just under
Negative induced electromotive force, then in the first vice-side winding NS1With the second vice-side winding NS2Also two amplitude size phases can be induced
Together, the antipodal sine voltage of phase, and pass through the second diode D2, third diode D3, the 4th diode D4 and
Five diode D5It realizes voltage-limiting protection, makes and primary side winding NP1First metal-oxide-semiconductor Q of same-phase1Conducting, and with primary side winding NP1It is complete
Second metal-oxide-semiconductor Q of full opposite phase2Cut-off.
From the working principle of driving power half-bridge resonance circuit 40 are as follows:
When with primary side winding NP1First metal-oxide-semiconductor Q of same-phase1After the excitation conducting of original pulse trigger signal, the
One metal-oxide-semiconductor Q1Drain electrode and source electrode between voltage increment dv/dt decline rapidly, at the same time, current increment di/dt is rapid
It is incremented by, the relationship of rapid change electric current and capacitance voltage gradient are as follows: i=C* (dv/dt), di/dt are the snow between metal-oxide-semiconductor leakage, source electrode
Collapse the increment of Current versus time.As the first metal-oxide-semiconductor Q1When being connected by single original pulse impulse, the second metal-oxide-semiconductor Q at this time2
It is off state, at this time DC voltage source VDCIt can be loaded on transmitting terminal impedance matching circuit by the midpoint of power half-bridge
50, the first metal-oxide-semiconductor Q1Drain-source current can continue to increase, specifically energize process as shown in Fig. 4.
In Fig. 4, arrow A indicates current direction, it is seen that the access energized has two:
First, the first metal-oxide-semiconductor Q1A part of drain-source current can pass through the second metal-oxide-semiconductor Q2Internal parasitic miller capacitance
Crss2To grid angle capacitor Cgs2Carry out charging of energizing；
Second, the first metal-oxide-semiconductor Q1The drain-source current of another part can flow through the capacitance terminal of transmitting terminal impedance matching circuit,
That is the 5th capacitor C5With the 9th capacitor C9, and then pass through the tenth capacitor C10With the 11st capacitor C11For pulse transformer T1It energizes.
Therefore, the first metal-oxide-semiconductor Q1Drain-source electrode current passes through grid source electrode angle capacitor Cgs2It is from driving with external faint positive feedback
Power half-bridge resonance circuit 40 is energized, to maintain magnetizing coil secondary loop and grid source electrode angle capacitor Cgs2Eigenfrequency
Oscillation, and make the first metal-oxide-semiconductor Q1Hourglass source electrode be further connected.Since two vice-side windings are in driving oscillatory process certainly,
Actually as a whole, it is only necessary to energize to any one metal-oxide-semiconductor, that is, tax is realized to whole self-oscillation
Can, therefore the first MOS pipe Q1 is connected, really to the second metal-oxide-semiconductor Q2Realization is energized, similarly it is found that the second metal-oxide-semiconductor Q2Conducting, it is real
Border is to the first metal-oxide-semiconductor Q1Realization is energized, and combines external faint positive-feedback circuit, can stablize the vibration for maintaining the driving circuit
Swing process.And the first metal-oxide-semiconductor Q1Resulting rapid change electric current flows through the first inductance L after conducting1, the 5th capacitor C5With the 9th capacitor C9
To ground, primary " drawing " movement is completed.Since drive waveforms are sine, therefore after half period, the first metal-oxide-semiconductor Q1Phase become
It is negative, the first metal-oxide-semiconductor Q1Into off state, and the second metal-oxide-semiconductor Q2Phase become just, i.e. the 2nd MOS pipe Q2In the lower half period
It begins to turn on, equally can also generate a rapid change electric current, which flows through the first inductance L1, the 5th capacitor C5With the 9th electricity
Hold C9, pass through the second metal-oxide-semiconductor Q of conducting2It discharges rapidly earth-return, completes primary " filling " movement.
Therefore, as the first metal-oxide-semiconductor Q1When conducting, the second metal-oxide-semiconductor Q2It is off；As the 2nd MOS pipe Q2When conducting, first
Metal-oxide-semiconductor Q1It is off.The above-mentioned period is repeated, the two alternates conducting, it can be achieved that from electric from driving power half-bridge resonance
The midpoint on road, i.e. the first metal-oxide-semiconductor Q1Source electrode export square wave voltage signal, amplitude VDC-I*RON, wherein VDCFor power supply electricity
Pressure, I are rapid change electric current, RONFor the conducting resistance of metal-oxide-semiconductor, which passes through the first inductance L1, the 5th capacitor C5With
9th capacitor C9It realizes level-one frequency-selective circuit, forms required sine voltage signal.For wireless power transmission coil,
That is transmitting coil T-coil and receiving coil R-coil, they can be equivalent to an inductance, therefore from the 5th capacitor C5With
Nine capacitor C9Obtained sine voltage signal will continue to by the 6th capacitor C6With transmitting coil T-coil, frequency-selective circuit is realized,
And then the magnetic field energy that electric flux is changed into alternation is launched.By the frequency-selective network of two-stage, expand the work frequency of the circuit
Width can adapt to operate normally under wider working frequency.
Due to the first metal-oxide-semiconductor Q1With the second metal-oxide-semiconductor Q2Process is energized and external faint positive feedback is conduct self-oscillatory
One entirety carries out realizing interaction.First metal-oxide-semiconductor Q1Conducting is to the second metal-oxide-semiconductor Q2Energize, and the second metal-oxide-semiconductor Q2
Conducting be to the first metal-oxide-semiconductor Q1Energize, and on circuit, the inductance parameters of two vice-side windings are L=LNS1=LNS2, micro-
Adjust capacitor C=C2=C3, it is equal, and C with the parasitic parameter inside the metal-oxide-semiconductor of modeliss=Crss+Cgs, therefore should be from driving
The working frequency f of power half-bridge resonance circuit can approximate calculation are as follows:
The working principle of transmitting terminal impedance matching circuit 50 and receiving-end impedance match circuit 80 are as follows:
The impedance matching circuit of the present embodiment has two parts, and a portion is transmitting terminal impedance matching circuit 50, another
Part is receiving-end impedance match circuit 80.Due to being all therefore the base of its resonance frequency using LC serial or parallel connection resonance structure
This calculation formula are as follows:
In actual circuit, transmitting coil 60 and receiving coil 70 are actually to exist in the form of an inductance.Cause
This, for transmitting terminal impedance matching circuit, the structure of resonance circuit is LCL structure, it is made of series resonance and parallel resonance,
The impedance matching filter circuit of prime is by the first inductance L1, the 5th capacitor C5With the 9th capacitor C9Series resonance is constituted, resonance frequency
Rate f1Calculating may be expressed as:
And the impedance matching filter circuit of rear class includes two-part resonance frequency, one is 60 inductance of transmitting coil
LT-coil, the 6th capacitor C6Series connection connection resonance composition, resonance frequency f2Calculating may be expressed as:
Secondly being 60 inductance L of transmitting coilT-coil, the 5th capacitor C5, the 9th capacitor C9With the 6th capacitor C6Parallel resonance group
At resonance frequency f3Calculating may be expressed as:
Therefore, the relationship between above three resonance frequency point are as follows:
f1<f2<f3
It please refers to shown in Fig. 6, therefore the parameter of reasonable selection transmitting terminal impedance matching circuit: the first inductance inductance can be passed through
L1, transmitting coil inductance LT-coil, the 5th capacitor C5With the 6th capacitor C6, can be by resonance frequency f1With resonance frequency f3Slightly it is staggered,
Make the front self-oscillatory eigenfrequency f of fixed power half-bridgeoIt falls in [f1, f3] range, to can get wider
Work bandwidth improves the reliability and adaptability of circuit.
In addition, transmitting terminal impedance matching circuit 50 should be rationally designed according to the characteristic of wireless transmission, first structure sets low reactance-resistance ratio
Voltage resonance, so that circuit stability is worked, the broadening of the frequency bandwidth of work, Q is quality factor.It is subsequent humorous with high q-factor voltage again
Vibration and high-frequency current resonance, to keep the range of transmitting farther, while can form the current resonance of wider bandwidth, make circuit work
Make transmission stable and that radio energy is effectively performed.The calculation expression of quality factor q is as follows:
For receiving-end impedance match circuit 80, the resonance structure of use is LC, therefore its resonance frequency f4Calculation formula are as follows:
Radio energy transmission system provided in this embodiment is used as novel master using from driving power half-bridge resonance circuit 40
Topology can simplify the design cost of driving circuit with this and improve the reliability in high frequency design process.In addition, the nothing
Efficiency of transmission and power and transmitting terminal impedance matching circuit 50, the ginseng of receiving-end impedance match circuit 80 of line electric energy transmission system
Number selection is closely related.
Therefore, radio energy transmission system provided by the embodiment of the utility model converts in circuit, institute only with second order
With photoelectric transformation efficiency height, the temperature rise of metal-oxide-semiconductor is low, is suitable for middle high-power applications occasion.
It is suitable for requiring higher field to power switch tube from driving power half-bridge resonance circuit 40 with faint positive feedback
It closes, and driving circuit design cost can be simplified, the drive waveforms of sine wave can slow down driving signal to rear class from driving power half
The impact of bridge resonance circuit 40, it can be achieved that power switch tube soft start and zero voltage switch, to improve radio energy biography
The whole work efficiency of defeated system, and high frequency design in enhance system functional reliability.
Transmitting terminal impedance matching circuit 50 can widen the work bandwidth of the system using LCL resonance structure, make it have compared with
Wide work bandwidth, and then improve the labor aptitude of system.
Compared to existing technologies, novel main topology is used as from driving power half-bridge resonance circuit 40 using positive feedback, made
Powerful wireless power transmission occasion, increases the safety of electrical equipment it is suitable in, reduces the cost of product, greatly
Widen the application of wireless power transmission technology in ground.
The above, above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. a kind of radio energy transmission system, including start-up circuit, driving circuit, transmitting terminal impedance matching circuit and emission lines
Circle, it is characterised in that:
It further include with primary side winding NP1, the first vice-side winding NS1With the second vice-side winding NS2Pulse transformer T1；
The driving circuit is from driving power half-bridge resonance circuit comprising the first mutually orthogonal circuit of phase and the second electricity
Road；
The start-up circuit is connected to the primary side winding NP1, two vice-side windings are connected to the first circuit and second
Circuit；
The capacitance terminal of the transmitting terminal impedance matching circuit is also attached to the primary side winding N of the pulse transformerP1, so that described
Driving circuit maintains persistent oscillation process.
2. radio energy transmission system according to claim 1, which is characterized in that the first vice-side winding NS1With second
Vice-side winding NS2Both end voltage amplitude is equal, opposite in phase.
3. radio energy transmission system according to claim 1, which is characterized in that the transmitting terminal impedance matching circuit is
LCL resonance structure.
4. radio energy transmission system according to claim 1, which is characterized in that first circuit includes the first MOS
Pipe Q1, the first vice-side winding NS1Both ends be connected to the first metal-oxide-semiconductor Q1Grid and source electrode.
5. radio energy transmission system according to claim 1, which is characterized in that first circuit further include for
First vice-side winding NS1Second capacitor C of resonance2, clipping pressure stabilizing the second diode D2With third diode D3, second electricity
Hold C2It is parallel to the first vice-side winding NS1, the second diode D2With third diode D3Described is parallel to after series connection
One vice-side winding NS1。
6. radio energy transmission system according to claim 1, which is characterized in that the second circuit includes the 2nd MOS
Pipe Q2, the second vice-side winding NS2Both ends be connected to the second metal-oxide-semiconductor Q2Grid and source electrode.
7. radio energy transmission system according to claim 1, which is characterized in that the second circuit further include for
Second vice-side winding NS2The third capacitor C of resonance3, clipping pressure stabilizing the 4th diode D4With the 5th diode D5, the third electricity
Hold C3It is parallel to the second vice-side winding NS2, the 4th diode D4With the 5th diode D5Described is parallel to after series connection
Two vice-side winding NS2。
8. radio energy transmission system according to claim 1, which is characterized in that the transmitting terminal impedance matching circuit packet
Include concatenated 5th capacitor C5With the 9th capacitor C9, the 5th capacitor C5With the 9th capacitor C9It is parallel to transmitting coil, described
Five capacitor C5With the 9th capacitor C9Between connecting pin be also connected with the tenth capacitor C10, the tenth capacitor C10Also it is in series with the 11st electricity
Hold C11, the 11st capacitor C11It is also attached to the primary side winding NP1。
9. radio energy transmission system according to claim 1, which is characterized in that the start-up circuit includes DC voltage
Source VDC, first resistor R1, second resistance R2, first capacitor C1, the 6th diode D6With two-way trigger tube D1；
The DC voltage source VDCCathode ground connection, the DC voltage source VDCAnode be connected to first resistor R1First
End, first resistor R1Second end be connected to second resistance R2First end, second resistance R2Second end be connected to first capacitor
C1First end, first capacitor C1Second end ground connection, two-way trigger tube D1First end be connected to first capacitor C1First
End, two-way trigger tube D1Second end be connected to primary side winding NP1First end, primary side winding NP1Second end ground connection；
First circuit includes and the first vice-side winding NS1Second capacitor C of resonance2, clipping pressure stabilizing the second diode D2,
Three diode D3With the first metal-oxide-semiconductor Q1；
First vice-side winding NS1First end be connected to the second capacitor C2First end, the second diode D2First end and first
Metal-oxide-semiconductor Q1Grid, the first vice-side winding NS1Second end be connected to the second capacitor C2Second end, third diode D3?
Two ends and the first metal-oxide-semiconductor Q1Source electrode, the second diode D2Second end and third diode D3First end polarity is opposite and phase
Connection；
The second circuit includes and the second vice-side winding NS2The third capacitor C of resonance3, clipping pressure stabilizing the 4th diode D4,
Five diode D5With the second metal-oxide-semiconductor Q2；
Second vice-side winding NS2First end be connected to third capacitor C3First end, the 4th diode D4First end and second
Metal-oxide-semiconductor Q2Grid, the second vice-side winding NS2Second end be connected to third capacitor C3Second end, the 5th diode D5?
Two ends and the second metal-oxide-semiconductor Q2Source electrode, the 4th diode D4Second end and the 5th diode D5First end polarity is opposite and phase
Connection；
6th diode D6First end be connected to first resistor R1Second end, the 6th diode D6Second end be connected to
One metal-oxide-semiconductor Q1Source electrode and the second metal-oxide-semiconductor Q2Drain electrode；
First metal-oxide-semiconductor Q1Drain electrode be connected to first resistor R1First end；
First vice-side winding NS1With the second vice-side winding NS2Both end voltage amplitude is equal, opposite in phase；
Transmitting terminal impedance matching circuit includes the first inductance L1, the 5th capacitor C5, the 6th capacitor C6, the 9th capacitor C9With the 12nd electricity
Hold C12；
First metal-oxide-semiconductor Q1Source electrode be connected to the 12nd capacitor C12First end, the 12nd capacitor C12Second end be connected to
One inductance L1First end, the first inductance L1Second end be connected to the 5th capacitor C5First end and the 6th capacitor C6First
End, the 5th capacitor C5Second end be connected to the 9th capacitor C9First end, the 9th capacitor C9Second end be connected to the 2nd MOS
Pipe Q2Source electrode, the 9th capacitor C9Second end be also grounded；
The both ends of transmitting coil are connected to the 6th capacitor C6Second end and the 9th capacitor C9Second end；
5th capacitor C5Second end and two-way trigger tube D1Second end between be also connected with the tenth capacitor C being serially connected10With
11st capacitor C11。
10. radio energy transmission system according to claim 1, which is characterized in that further include receiving-end impedance matching electricity
Road, the receiving-end impedance match circuit include receiving coil and the 7th capacitor C7, the first end of the receiving coil is connected to
7th capacitor C7First end, the 7th capacitor C7Second end be connected to the first end of load, the second end of load is connected to reception
The second end of the second end of coil, load is also grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820553054.4U CN208767856U (en) | 2018-04-18 | 2018-04-18 | A kind of radio energy transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820553054.4U CN208767856U (en) | 2018-04-18 | 2018-04-18 | A kind of radio energy transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258814A (en) * | 2018-04-18 | 2018-07-06 | 广东工业大学 | A kind of radio energy transmission system |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258814A (en) * | 2018-04-18 | 2018-07-06 | 广东工业大学 | A kind of radio energy transmission system |
| CN108258814B (en) * | 2018-04-18 | 2023-07-25 | 广东工业大学 | Wireless power transmission system |
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