CN208955902U - A kind of circuit topological structure suitable for the transmission of two-way near field electric energy - Google Patents
A kind of circuit topological structure suitable for the transmission of two-way near field electric energy Download PDFInfo
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- CN208955902U CN208955902U CN201821373643.0U CN201821373643U CN208955902U CN 208955902 U CN208955902 U CN 208955902U CN 201821373643 U CN201821373643 U CN 201821373643U CN 208955902 U CN208955902 U CN 208955902U
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Abstract
The utility model discloses a kind of circuit topological structure suitable for the transmission of two-way near field electric energy, the circuit topological structure includes full-bridge inverting, primary side resonant dynamic compensation network, primary coil, secondary coil, secondary side resonant dynamic compensation network, full-bridge synchronous rectification and load.The two-way near field transmission of electric energy may be implemented in the utility model, and in the different coil coefficients of coup, under the conditions of different loads size and the system parameter variations due to caused by the factors such as temperature, device production foozle etc., the PWM duty cycle that switch can be switched by adjusting capacitor generates the equivalent capacity capacitance of consecutive variations to resonant network progress dynamic compensation, to realize the Sofe Switch of full-bridge inverting, the reactive power in system capacity transmission is minimized, and then maximizes system power efficiency of transmission.Further, since the symmetry of circuit structure, it can be achieved that near field electric energy transmitted in both directions, i.e., realization power grid and load between bi-directional energy flow, improve utilization rate of the system in smart grid.
Description
Technical field
The present invention relates to power electronics topological circuit technology more particularly to a kind of electricity suitable for the transmission of two-way near field electric energy
Road topological structure.
Background technique
Electric energy transmission near field is produced in secondary coil by converting alternating electromagnetic field by primary coil for high-frequency circuit
The rectified circuit of raw high frequency induction current is converted into direct current output.In recent years, which has been widely used in smart phone
Wireless charging product in, in addition this technology also has wide answer in domestic robot, industrial robot, electric car field
Use prospect.
In order to improve energy transmission distance and efficiency, resonance compensation net can be increased in primary coil and secondary coil respectively
Network, i.e. composition magnetic resonance.The resonance frequency of current existing resonance compensation network by inductance in compensation network or capacitor, coil from
Sense or mutual inductance determine that when relative position changes between coil, mutual inductance and the coefficient of coup can be sent out between self-induction of loop and coil
Raw corresponding change, in addition under different operating temperature environment, ferritic magnetic conductivity can also change in loop construction, in turn
Coil electric parameter is caused to change.Further, since inductance error caused by batch production and capacitance error not can avoid yet.
Therefore, in actual operation, a degree of variation can occur for resonance frequency, if switching frequency off-resonance frequency is excessive, meeting
Cause the hard switching and the serious problems such as excessive reactive power loss of high-frequency inverter；If switching frequency follows resonance frequency to become
Change, then system will occupy biggish frequency bandwidth resource under different operating conditions, and on the one hand domestic and international relevant criterion is right
Operating frequency range is defined, and on the other hand, wider operating frequency range will make system EMC Design more multiple
It is miscellaneous, and increase system cost.
Summary of the invention
The object of the present invention is to provide a kind of circuit topological structures suitable for the transmission of two-way near field electric energy.
Realize the technical solution of the object of the invention are as follows: a kind of circuit topological structure suitable for the transmission of two-way near field electric energy,
Including input DC power U1, full bridge inverter, primary side resonant dynamic compensation network, primary coil 3Li1, secondary coil 3Lo1、
Secondary side resonant dynamic compensation network, full-bridge synchronous rectification circuit and load battery U2, the full bridge inverter, primary side harmonic motion
State compensation network and secondary side resonant dynamic compensation network, full-bridge synchronous rectification circuit specific topological structure about primary coil
3Li1, secondary coil 3Lo1Symmetrically；
The input DC power U1, full bridge inverter, primary side resonant dynamic compensation network be sequentially connected, the primary side
Resonant dynamic compensation network output end respectively with primary coil 3Li1Both ends connection, the secondary coil 3Lo1Both ends difference
It is connect with the input terminal of secondary side resonant dynamic compensation network, the primary coil 3Li1, secondary coil 3Lo1Same Name of Ends is opposite, institute
The output end for stating secondary side resonant dynamic compensation network is connect with the input terminal of full-bridge synchronous rectification circuit, full-bridge synchronous rectification circuit
Output end and load battery U2Both ends connection.
Preferably, the full bridge inverter includes the first bus capacitor CBUS1, four switching tube Qi1-Qi4, described first
Bus capacitor CBUS1Anode with input DC power U1Anode connection, the first bus capacitor CBUS1Cathode and input
DC power supply U1Cathode connection, four switching tube Qi1-Qi4Connect into inversion H bridge, anode and the first bus of inversion H bridge
Capacitor CBUS1Anode connection, the cathode of inversion H bridge and the first bus capacitor CBUS1Cathode connection.
Preferably, the primary side resonant dynamic compensation network includes the first compensation inductance Lif, the first equivalent impedance module,
One series capacitance Ci1, the first shunt capacitance Cif, wherein the first compensation inductance LifOne end and full bridge inverter one
A output end connection, the first compensation inductance LifThe other end connect with one end of the first equivalent impedance module, described first
The other end of equivalent impedance module and the first series capacitance Ci1One end connection, the first shunt capacitance CifOne end and institute
State the other end connection of the first equivalent impedance module, the first shunt capacitance CifThe other end and full bridge inverter it is another
A output end connection, the first shunt capacitance CifThe other end and the first series capacitance Ci1The other end it is humorous as primary side
Two output ends of vibrational state compensation network.
Preferably, the secondary side resonant dynamic compensation network includes the second compensation inductance Lof, the second equivalent impedance module,
Two series capacitance Co1, the second shunt capacitance Cof, the second series capacitance Co1One end and secondary coil 3Lo1Same Name of Ends connect
It connects, the second series capacitance Co1The other end connect with one end of the second equivalent impedance module, the second equivalent impedance mould
The other end of block and the second compensation inductance LofOne end connection, the second shunt capacitance CofOne end and the second series capacitance
Co1The other end connection, the second shunt capacitance CofThe other end and secondary coil 3Lo1Non-same polarity connection, described the
Two compensation inductance LofThe other end and the second shunt capacitance CofThe other end respectively as secondary side resonant dynamic compensation network
Two output ends, the second equivalent impedance module specifically: the switching capacity and compensating switch being connected in parallel, or be connected on
Switching capacity and compensating switch together.
Preferably, full-bridge synchronous rectification circuit includes the second bus capacitor CBUS2And four switching tube Qo1-Qo4, four are opened
Close pipe Qo1-Qo4Connect into inversion H bridge, two input terminals of inversion H bridge respectively with secondary side resonant dynamic compensation network
Two output end connections, anode and the second bus capacitor C of the inversion H bridgeBUS2Anode connection, the inversion H bridge it is negative
Pole and the second bus capacitor CBUS2Cathode connection, the second bus capacitor CBUS2Anode, cathode simultaneously with load battery
U2Positive and negative anodes connection.
In forward energy flowing, primary coil is alternating electromagnetic field transmitting coil, and secondary coil is receiving coil.Inverse
When to energy flow, primary coil is converted to receiving coil, and secondary coil is alternating electromagnetic field transmitting coil, full bridge inverter
Middle inversion H bridge is converted to the operating mode of rectification H bridge, similarly, in full-bridge synchronous rectification circuit rectifies H bridge and is converted to inversion H bridge
Operating mode, due to the symmetry of the circuit system topology, the working principle of former pair side resonant dynamic compensation network is also sent out
Raw symmetrical conversion.
The control strategy of near field electric energy transmission system of the present invention are as follows: detect the output voltage of the full bridge inverter with it is defeated
Phase difference between electric current out detects the phase difference between the input voltage and input current of the full-bridge synchronous rectification, detection system
Described in full-bridge inverting input voltage and input current, the output voltage of institute's full-bridge synchronous rectification and output electricity in detection system
Stream, each input signal in summary detected calculates first compensating switch by control algolithm and the second compensation is opened
The duty ratio and timing of pass, the phase shift angle of the phase shifting control of the full-bridge inverting, the input DC power voltage, it is described
Control algolithm can be realized by single-chip microprocessor MCU or digital signal processor DSP.Controlling target is by adjusting above-mentioned control amount
Target output voltage, output electric current or output power are obtained, while realizing the output voltage and output electric current of the full-bridge inverting
Between phase difference reach setting value.
Compared with prior art, the present invention its remarkable result are as follows: 1) PWM that the present invention passes through the former secondary side compensating switch of change
Duty ratio realizes that continuous dynamic adjusts the equivalent impedance of former secondary side resonance compensation network, simultaneously with reactive power loss in reduction system
Realize Sofe Switch, therefore the present invention can realize that efficient energy is transmitted under different operating conditions；2) the former secondary side harmonic motion of the present invention
State compensation network can effectively offset the influence of device error bring, so that near field electric energy transmission system be made to have under complex working condition
High-performance and high reliability reduce Primary Component and manufacture and design difficulty and cost, and then have practical application value；3) of the invention
Can be realized can work under different complex working conditions in a certain constant frequency.4) circuit topology of the present invention has symmetry, no
Additional circuit structure need to be increased, the transmitted in both directions of energy can be realized, can scale access smart grid, more rationally effectively
Land productivity carries out charge and discharge with power grid.
The present invention will be further described for explanation with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is circuit topology figure of the present invention.
Fig. 2 is the way of realization schematic diagram of the first compensating switch and the second compensating switch of the invention.
Fig. 3 is the way of realization schematic diagram of first switch capacitor and second switch capacitor of the present invention.
Fig. 4 is half-bridge inversion circuit implementation schematic diagram of the invention.
Fig. 5 is the zero voltage switch waveform diagram of compensating switch of the present invention.
Fig. 6 is system application and the control strategy schematic diagram of circuit topology of the present invention.
Fig. 7 is circuit topology of the present invention in primary coil self-induction Li1The comparison of wave shape of variation and dynamic compensation front and back is shown
It is intended to.
Fig. 8 is circuit topology of the present invention in secondary coil self-induction Lo1The comparison of wave shape of variation and dynamic compensation front and back is shown
It is intended to.
Fig. 9 is the wave before and after circuit topology of the present invention coefficient of coup k between former secondary coil changes and dynamically compensates
Shape contrast schematic diagram.
Specific embodiment
In order to clearly describe thought of the invention, technical solution and advantage, specific embodiment passes through embodiment
Show with attached drawing.It is apparent that described embodiment is a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art under the premise of not making the creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
A kind of circuit topological structure suitable for the transmission of two-way near field electric energy, including input DC power U1, full-bridge inverting
Circuit 1, primary side resonant dynamic compensation network 2, primary coil 3Li1, secondary coil 3Lo1, it is secondary side resonant dynamic compensation network 4, complete
Bridge circuit of synchronous rectification 5 and load battery U2, the full bridge inverter 1, primary side resonant dynamic compensation network 2 and secondary side resonance
Dynamic compensation 4, full-bridge synchronous rectification circuit 5 specific topological structure about primary coil 3Li1, secondary coil 3Lo1It is right
Claim；
The input DC power U1, full bridge inverter 1, primary side resonant dynamic compensation network 2 be sequentially connected, the original
2 output end of side resonant dynamic compensation network respectively with primary coil 3Li1Both ends connection, the secondary coil 3Lo1Both ends point
It is not connect with the input terminal of secondary side resonant dynamic compensation network 4, the primary coil 3Li1, secondary coil 3Lo1Same Name of Ends is opposite,
The output end of pair side resonant dynamic compensation network 4 is connect with the input terminal of full-bridge synchronous rectification circuit 5, full-bridge synchronous rectification
The output end and load battery U of circuit 52Both ends connection.
In further embodiment, the full bridge inverter 1 includes the first bus capacitor CBUS1, four switching tube Qi1-
Qi4, the first bus capacitor CBUS1Anode with input DC power U1Anode connection, the first bus capacitor CBUS1's
Cathode and input DC power U1Cathode connection, four switching tube Qi1-Qi4Connect into inversion H bridge, the anode of inversion H bridge
With the first bus capacitor CBUS1Anode connection, the cathode of inversion H bridge and the first bus capacitor CBUS1Cathode connection.Certain
In embodiment, the semiconductor power devices such as switching tube IGBT, MOSFET.
In further embodiment, the primary side resonant dynamic compensation network 2 includes the first compensation inductance Lif, it is first equivalent
Impedance module, the first series capacitance Ci1, the first shunt capacitance Cif, wherein the first compensation inductance LifOne end and full-bridge it is inverse
One output end on power transformation road 1 connects, the first compensation inductance LifThe other end and the first equivalent impedance module one end connect
It connects, the other end of the first equivalent impedance module and the first series capacitance Ci1One end connection, the first shunt capacitance Cif
One end connect with the other end of the first equivalent impedance module, the first shunt capacitance CifThe other end and full-bridge inverting
The another output of circuit 1 connects, the first shunt capacitance CifThe other end and the first series capacitance Ci1The other end
As two output ends of primary side resonant dynamic compensation network 2, the first equivalent impedance module specifically: be connected in parallel
Switching capacity and compensating switch, or the switching capacity and compensating switch that are cascaded.
Preferably, the compensating switch be two-way switch, in certain embodiments, compensating switch by two or several
The semiconductor power devices such as IGBT, MOSFET are in series.
In further embodiment, pair side resonant dynamic compensation network 4 includes the second compensation inductance Lof, it is second equivalent
Impedance module, the second series capacitance Co1, the second shunt capacitance Cof, the second series capacitance Co1One end and secondary coil 3Lo1
Same Name of Ends connection, the second series capacitance Co1The other end connect with one end of the second equivalent impedance module, described second
The other end of equivalent impedance module and the second compensation inductance LofOne end connection, the second shunt capacitance CofOne end and the
Two series capacitance Co1The other end connection, the second shunt capacitance CofThe other end and secondary coil 3Lo1Non-same polarity connect
It connects, the second compensation inductance LofThe other end and the second shunt capacitance CofThe other end respectively as secondary side resonant dynamic
Two output ends of compensation network 4, as shown in figure 3, the second equivalent impedance module specifically: the switch electricity being connected in parallel
Hold and compensating switch, or the switching capacity and compensating switch that are cascaded, by adjusting compensating switch duty ratio with continuous
Change the equivalent impedance of switching capacity.The conducting of compensating switch and shutdown timing are determined according to compensation inductive current, to realize zero
Voltage turn-on and shutdown reduce switching loss.
Preferably, the compensating switch is two-way switch.As shown in Fig. 2, in certain embodiments, compensating switch is by two
Or the semiconductor power devices such as several IGBT, MOSFET are in series.
In further embodiment, full-bridge synchronous rectification circuit 5 includes the second bus capacitor CBUS2And four switching tubes
Qo1-Qo4, four switching tube Qo1-Qo4Connect into inversion H bridge, two input terminals of inversion H bridge respectively with secondary side harmonic motion
Two output ends of state compensation network 4 connect, anode and the second bus capacitor C of the inversion H bridgeBUS2Anode connection, institute
State the cathode and the second bus capacitor C of inversion H bridgeBUS2Cathode connection, the second bus capacitor CBUS2Anode, cathode
Simultaneously with load battery U2Positive and negative anodes connection.In certain embodiments, the semiconductor powers device such as switching tube IGBT, MOSFET
Part.
As shown in figure 4, in further embodiment, when the power of external near-field energy Transmission system is less than 500W, full-bridge
Inverter circuit 1 replaces with half-bridge inversion circuit.When power is less than 500W, since power grade is small, it is not necessary that implement energy
Reverse transmission, the circuit after change do not support bidirectional energy to transmit, and positive can only transmit.
In certain embodiments, the first compensation inductance and the second compensation inductance can be by including FERRITE CORE or iron
The coil windings of crystal are constituted, and can also be made of the coil windings for not including FERRITE CORE or iron crystal, can also be by printing
Circuit board trace winding processed is constituted, and the plane winding that can also be made of litz wire is constituted.
In certain embodiments, primary coil and the secondary coil are to be made of litz wire or printed circuit board traces etc.
Plane winding coil, ferrite and aluminium sheet are installed to shield export-oriented radiation field in the side of winding coil.
There are four types of operating modes by the present invention: dynamic-dynamic, dynamic-static, static state-dynamic, static-static.Dynamic is mended
It repays switch to be controlled by PWM with particular duty cycle, static state is that compensating switch is normally opened or normally off；Operating mode '-' left side is
Refer to primary side, that is, transmitting terminal, operating mode '-' the right refers to secondary side i.e. receiving end.Working frequency of the present invention is certain value, in particular,
The present invention may be implemented to be worked under complex working condition in a certain constant frequency.The switching frequency of working frequency and full bridge inverter
It is identical, it is also identical as the switching frequency of full-bridge synchronous rectification circuit.
The present invention is suitable for the control strategy of the circuit topological structure of two-way near field electric energy transmission are as follows: detection full-bridge inverting electricity
Phase difference between the output voltage and output electric current on road, detects the input voltage and input current of the full-bridge synchronous rectification circuit
Between phase difference, detect the input voltage and input current of the full bridge inverter, detection institute's full-bridge synchronous rectification circuit
Output voltage and output electric current, each input signal in summary detected calculate first compensation by control algolithm
The duty ratio and timing of switch and the second compensating switch, the phase shift angle of the phase shifting control of the full-bridge inverting, the input are straight
The voltage in galvanic electricity source, the control algolithm can be realized by single-chip microprocessor MCU or digital signal processor DSP.Controlling target is
Target output voltage, output electric current or output power are obtained by adjusting above-mentioned control amount, while realizing the full-bridge inverting
Phase difference between output voltage and output electric current reaches setting value.
Below with reference to embodiment, the present invention will be further described.
Embodiment 1
A kind of circuit topology suitable for two-way near field electric energy transmission system, as shown in Figure 1, including input DC power
U1, full bridge inverter 1, primary side resonant dynamic compensation network 2, primary coil 3Li1, secondary coil 3Lo1, secondary side resonant dynamic mends
Repay network 4, full-bridge synchronous rectification circuit 5 and load battery U2, the full bridge inverter 1, primary side resonant dynamic compensation network 2
With secondary side resonant dynamic compensation network 4, full-bridge synchronous rectification circuit 5 specific topological structure about primary coil 3Li1, secondary sideline
Enclose 3Lo1Symmetrically；
The full bridge inverter 1 includes the first bus capacitor CBUS1, four switching tube Qi1-Qi4, the first bus electricity
Hold CBUS1Anode with input DC power U1Anode connection, the first bus capacitor CBUS1Cathode and input dc power
Source U1Cathode connection, four switching tube Qi1-Qi4Connect into inversion H bridge, switching tube Qi1Source electrode and switching tube Qi3Drain electrode connects
It is connected in the first inverting output terminal A, switching tube Qi2Source electrode and switching tube Qi4Drain electrode is connected as the second inverting output terminal B, switching tube Qi1
Drain electrode and switching tube Qi2Drain electrode is connected as H bridge anode, switching tube Qi3Source electrode and switching tube Qi4Source electrode is connected as H bridge cathode.Inversion
Anode and the first bus capacitor C of H bridgeBUS1Anode connection, the cathode of inversion H bridge and the first bus capacitor CBUS1Cathode connect
It connects.
The primary side resonant dynamic compensation network 2 includes the first compensation inductance Lif, the first equivalent impedance module, first series connection
Capacitor Ci1, the first shunt capacitance Cif, wherein the first compensation inductance LifOne end and one of full bridge inverter 1 output
End connection, the first compensation inductance LifThe other end connect with one end of the first equivalent impedance module, the first equivalent resistance
The other end of anti-module and the first series capacitance Ci1One end connection, the first shunt capacitance CifOne end and described first
The other end of equivalent impedance module connects, the first shunt capacitance CifThe other end and full bridge inverter 1 another is defeated
Outlet connection, the first shunt capacitance CifThe other end and primary coil Li1Non-same polarity connection, first series electrical
Hold Ci1The other end and primary coil Li1Same Name of Ends connection；
The first equivalent impedance module specifically: the first switch capacitor C being connected in parallelisWith, the first compensating switch
S1.First compensating switch S1For two-way switch.
Pair side resonant dynamic compensation network 4 includes the second compensation inductance Lof, the second equivalent impedance module, second series connection
Capacitor Co1, the second shunt capacitance Cof, the second series capacitance Co1One end and secondary coil 3Lo1Same Name of Ends connection, it is described
Second series capacitance Co1The other end connect with one end of the second equivalent impedance module, the second equivalent impedance module it is another
End and the second compensation inductance LofOne end connection, the second shunt capacitance CofOne end and the second series capacitance Co1It is another
End connection, the second shunt capacitance CofThe other end and secondary coil 3Lo1Non-same polarity connection, it is described second compensation electricity
Feel LofThe other end and the second shunt capacitance CofThe other end it is defeated respectively as two of secondary side resonant dynamic compensation network 4
Outlet is connect with the input terminal of full-bridge synchronous rectification circuit 5；
The second equivalent impedance module specifically: the second switch capacitor C being connected in parallelos, the second compensating switch S2,
Second compensating switch S2For two-way switch.
The full-bridge synchronous rectification circuit 5 includes the second bus capacitor CBUS2And four switching tube Qo1-Qo4, four switches
Pipe Qo1-Qo4Connect into inversion H bridge, two input terminals of inversion H bridge respectively with secondary side resonant dynamic compensation network 4
Two output end connections, anode and the second bus capacitor C of the inversion H bridgeBUS2Anode connection, the inversion H bridge it is negative
Pole and the second bus capacitor CBUS2Cathode connection, the second bus capacitor CBUS2Anode, cathode simultaneously with load battery
U2Positive and negative anodes connection.
In the present invention switching frequency of the first compensating switch and the second compensating switch is identical, and opens with full bridge inverter
It is identical to close frequency.The PWM duty cycle of first compensating switch and the second compensating switch determines the first switch capacitor and described
Equivalent capacity capacitance of the second switch capacitor in compensation network.
Resonant capacitance in the present invention, i.e. first switch capacitor, second switch capacitor, the first shunt capacitance, the first series connection
Capacitor, the second shunt capacitance and the second series capacitance answer the capacity type that choice accuracy is high, internal resistance is small to reduce loss, such as
Ceramic electrical perhaps thin-film capacitor.
In the present invention, the conducting of the compensating switch of switching capacity and shutdown timing are true according to the corresponding compensation inductive current
It is fixed, to realize no-voltage conducting and shutdown, reduce switching loss.As shown in figure 5, the driving signal of the compensating switch is VGS1,
Drain signal is VDS1, as the VDS1When being zero, driving signal is got higher, i.e., the described compensating switch is in VDS1It is connected when no-voltage, is
No-voltage conducting；When driving signal is lower, the VDS1Start slowly to rise from zero, i.e., the described compensating switch is in VDS1When no-voltage
Shutdown is zero voltage turn-off.
There are multiple resonance frequencies, respectively ω in the present invention0、ω1、ω2、ω3, ideally ω0=ω1=ω2
=ω3, when inductance values certain under different operating conditions or capacitance change, by the adjustment of the control strategy, each resonance
Frequency is close to working frequency ω.
Wherein, Cis1For equivalent capacity capacitance of the first switch capacitor under first compensating switch effect, Cos1
For equivalent capacity capacitance of the second switch capacitor under second compensating switch effect.
When the relative position of primary coil and secondary coil changes in the present invention, mutual inductance will between self-induction of loop and coil
It changes, the coefficient of coup between coil is significantly reduced with the increase of offset distance in particular；When there is metal object in environment
When body is close to the primary coil or the secondary coil, self-induction of loop will also change；When variation of ambient temperature or described
When primary coil and the secondary coil own loss lead to temperature change, since ferritic magnetic conductivity is in different temperatures
Under the conditions of variation lead to the variation of mutual inductance between self-induction of loop and coil；Additionally due to electricity caused by the manufacture factors such as production technology
Sense and capacitance error not can avoid.In conclusion near field electric energy transmission system is under actual operating conditions, inductance inductance value and electricity
Design theory value can be deviateed to a certain extent by holding capacitance, be arranged if cannot implement effective dynamic compensation under different operating conditions
It applies, system resonance frequencies will shift, and will lead to system transmission characteristics variation.Such as the full-bridge inverting output voltage and institute
The phase difference increase stated between full-bridge inverting output electric current causes reactive power loss to increase, the full-bridge inverting output voltage and institute
The phase difference stated between full-bridge inverting output electric current leads to institute by just becoming negative (i.e. the advanced inverter output voltage of inverter output current)
State the hard switching of full-bridge inverting switching tube, system output power ability reduction etc. under non-ideal operating condition.Such complicated
Operating condition under, the present invention adjusts the original by dynamically controlling the PWM duty cycle that the shunt compensation of the switching capacity switchs
The equivalent impedance of secondary side resonant dynamic compensation network keeps system resonance frequencies defeated close to system operating frequency, the full-bridge inverting
Phase difference is kept between impedance guarantees zero voltage switch in weak perception, makes the output voltage of the full-bridge inverting and exports electric current out
In lesser value to minimize the reactive power of the primary side resonant dynamic compensation network, make the input of the full-bridge synchronous rectification
Phase difference is maintained at lesser value to minimize the idle function of the secondary side resonant dynamic compensation network between voltage and input current
The power output capacity of rate, lifting system under different operating conditions.
Input DC power is generally the direct current output of circuit of power factor correction.Circuit of power factor correction by single-phase or
Three-phase alternating current is converted to direct current output, while guaranteeing that AC input current mutually follows together with input voltage.In bidirectional energy stream
In dynamic system, circuit of power factor correction should support two-way changing, i.e., positive to exchange the circuit of power factor correction for turning direct current,
The reverse inverter circuit that stream and feedback grid are delivered for direct current.
Control strategy of the invention are as follows: as shown in fig. 6, measuring the full-bridge inverting respectively using voltage and current detection circuit
Input voltage and input current U1、I1, the full-bridge inverting output voltage electric current UAB、IAB, the full-bridge rectification input voltage and input current UCD、
ICD, the full-bridge rectification output voltage electric current U2、I2.Control unit COMPREHENSIVE CALCULATING UAB、IABBetween phase difference, UCD、ICDBetween
The information such as phase difference, input power, output power, obtain the phase shift angle, described defeated of the phase shifting control of the full-bridge inverting
Enter the voltage of DC power supply, described control unit includes primary-side-control unit and secondary side control unit, can pass through single-chip microprocessor MCU
Or digital signal processor DSP is realized, mode (such as WIFI) is handed over by wireless communication for primary-side-control unit and secondary side control unit
Change information.The primary-side-control unit exports 5 pwm signal Gi1、Gi2、Gi3、Gi4、GS1Switching tube is respectively driven through driving circuit
Qi1-Qi4、S1；The pair side control unit exports 5 PWM model Go1、Go2、Go3、Go4、GS2Q is respectively driven through driving circuito1-
Qo4、S2.The primary-side-control unit adjusts circuit of power factor correction output voltage by PFC control circuit.Controlling target is
Target output voltage, output electric current or output power are obtained by adjusting above-mentioned control amount, while realizing the full-bridge inverting
Phase difference between output voltage and output electric current reaches setting value.
Since under actual working conditions, corresponding change, the present embodiment can occur for self-induction of loop, mutual inductance and the coefficient of coup
When analyzing coefficient of coup variation between the variation of primary coil self-induction, the variation of secondary coil self-induction, former secondary coil respectively, pass through institute
State the voltage and current work wave before and after the adjustment of primary side resonant dynamic compensation network and secondary side resonant dynamic compensation network.
As shown in fig. 7, the full-bridge inverting output voltage U when primary coil inductance reduces by 10%ABElectric current IAB0By
Full-bridge inverting output electric current after the equivalent impedance of dynamic compensation reduction first switch capacitor is IAB1, full-bridge inverting output voltage
Phase difference with output electric current is by Ψ0It is reduced to Ψ1, while guaranteeing full-bridge inverting Sofe Switch, reduce primary side resonant dynamic
Reactive power in compensation network.
As shown in figure 8, the full-bridge inverting output voltage U when secondary coil inductance reduces by 10%ABElectric current IAB0By
Dynamic compensation increases the equivalent impedance of first switch capacitor and to reduce the full-bridge inverting after the equivalent impedance of second switch capacitor defeated
Electric current is I outAB1, the phase difference of full-bridge inverting output voltage and output electric current0Less than zero, i.e. the advanced inversion of inverter current is electric
Pressure, full-bridge inverting switching tube work in hard switching state；Phase difference is Ψ after dynamically adjusted1, i.e. inverter current slightly lags
Inverter voltage UAB, while guaranteeing full-bridge inverting Sofe Switch, reduce the reactive power in primary side resonant dynamic compensation network.
As shown in figure 9, the full-bridge inverting output voltage U when former secondary coil coefficient is reduced to 0.1 by 0.2ABElectric current
IAB0Full-bridge inverting output electric current after dynamic compensates the equivalent impedance for reducing first switch capacitor is IAB1, full-bridge inverting is defeated
The phase difference of voltage and output electric current is by Ψ out0It is reduced to Ψ1, while guaranteeing full-bridge inverting Sofe Switch, it is humorous to reduce primary side
Reactive power in vibrational state compensation network.
In conclusion it is equal that full-bridge inverting exports electric current when coupling condition changes between coil inductance variation or coil
Significant changes can occur, after former secondary side resonant dynamic compensation network adjustment of the present invention, full-bridge inverting exports work always
Make to maintain the Sofe Switch state of switching tube in weak perception, reduce the reactive power in primary side resonant dynamic compensation network, mention
High system power efficiency of transmission, enhances the reliability of system work.
Claims (8)
1. a kind of circuit topological structure suitable for the transmission of two-way near field electric energy, which is characterized in that including input DC power U1、
Full bridge inverter (1), primary side resonant dynamic compensation network (2), primary coil 3Li1, secondary coil 3Lo1, secondary side resonant dynamic
Compensation network (4), full-bridge synchronous rectification circuit (5) and load battery U2, the full bridge inverter (1), primary side resonant dynamic
Compensation network (2) and secondary side resonant dynamic compensation network (4), full-bridge synchronous rectification circuit (5) specific topological structure about original
3L is enclosed in sidelinei1, secondary coil 3Lo1Symmetrically；
The input DC power U1, full bridge inverter (1), primary side resonant dynamic compensation network (2) be sequentially connected, the original
Side resonant dynamic compensation network (2) output end respectively with primary coil 3Li1Both ends connection, the secondary coil 3Lo1Both ends
It is connect respectively with the input terminal of secondary side resonant dynamic compensation network (4), the primary coil 3Li1, secondary coil 3Lo1Same Name of Ends
Relatively, the output end of the secondary side resonant dynamic compensation network (4) is connect with the input terminal of full-bridge synchronous rectification circuit (5), entirely
The output end and load battery U of bridge circuit of synchronous rectification (5)2Both ends connection.
2. the circuit topological structure according to claim 1 suitable for the transmission of two-way near field electric energy, which is characterized in that described
Full bridge inverter (1) includes the first bus capacitor CBUS1, four switching tube Qi1-Qi4, the first bus capacitor CBUS1Just
Pole and input DC power U1Anode connection, the first bus capacitor CBUS1Cathode and input DC power U1Cathode
Connection, four switching tube Qi1-Qi4Connect into inversion H bridge, anode and the first bus capacitor C of inversion H bridgeBUS1Anode even
It connects, the cathode of inversion H bridge and the first bus capacitor CBUS1Cathode connection.
3. the circuit topological structure according to claim 1 suitable for the transmission of two-way near field electric energy, which is characterized in that described
Primary side resonant dynamic compensation network (2) includes the first compensation inductance Lif, the first equivalent impedance module, the first series capacitance Ci1,
One shunt capacitance Cif, wherein the first compensation inductance LifOne end connect with an output end of full bridge inverter (1),
The first compensation inductance LifThe other end connect with one end of the first equivalent impedance module, the first equivalent impedance module
The other end and the first series capacitance Ci1One end connection, the first shunt capacitance CifOne end and first equivalent impedance
The other end of module connects, the first shunt capacitance CifThe other end and full bridge inverter (1) another output connect
It connects, the first shunt capacitance CifThe other end and the first series capacitance Ci1The other end as primary side resonant dynamic compensate
Two output ends of network (2)；
The first equivalent impedance module specifically: the switching capacity and compensating switch being connected in parallel, or be cascaded
Switching capacity and compensating switch.
4. the circuit topological structure according to claim 3 suitable for the transmission of two-way near field electric energy, which is characterized in that described
Compensating switch is two-way switch.
5. the circuit topological structure according to claim 1 suitable for the transmission of two-way near field electric energy, which is characterized in that described
Secondary side resonant dynamic compensation network (4) includes the second compensation inductance Lof, the second equivalent impedance module, the second series capacitance Co1,
Two shunt capacitance Cof, the second series capacitance Co1One end and secondary coil 3Lo1Same Name of Ends connection, it is described second series connection
Capacitor Co1The other end connect with one end of the second equivalent impedance module, the other end and second of the second equivalent impedance module
Compensate inductance LofOne end connection, the second shunt capacitance CofOne end and the second series capacitance Co1The other end connection, institute
State the second shunt capacitance CofThe other end and secondary coil 3Lo1Non-same polarity connection, it is described second compensation inductance LofIt is another
End and the second shunt capacitance CofThe other end respectively as secondary side resonant dynamic compensation network (4) two output ends；
The second equivalent impedance module specifically: the switching capacity and compensating switch being connected in parallel, or be cascaded
Switching capacity and compensating switch.
6. the circuit topological structure according to claim 5 suitable for the transmission of two-way near field electric energy, which is characterized in that described
Compensating switch is two-way switch.
7. the circuit topological structure according to claim 1 suitable for the transmission of two-way near field electric energy, which is characterized in that full-bridge
Circuit of synchronous rectification (5) includes the second bus capacitor CBUS2And four switching tube Qo1-Qo4, four switching tube Qo1-Qo4It connects into
Inversion H bridge is connected into, two input terminals of inversion H bridge connect with two output ends of secondary side resonant dynamic compensation network (4) respectively
It connects, anode and the second bus capacitor C of the inversion H bridgeBUS2Anode connection, the cathode and the second bus of the inversion H bridge
Capacitor CBUS2Cathode connection, the second bus capacitor CBUS2Anode, cathode simultaneously with load battery U2Positive and negative anodes connect
It connects.
8. the circuit topological structure according to claim 1 suitable for the transmission of two-way near field electric energy, which is characterized in that when outer
The power grade of portion's near-field energy Transmission system is lower than 500 watt-hours, and full bridge inverter (1) replaces with half-bridge inversion circuit.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245536A (en) * | 2018-08-24 | 2019-01-18 | 李建科 | A kind of circuit topological structure suitable for the transmission of two-way near field electric energy |
| CN109245542A (en) * | 2018-10-09 | 2019-01-18 | 李建科 | A kind of symmetrical power converter circuit topological structure and its control method |
| CN109302070A (en) * | 2018-10-09 | 2019-02-01 | 李建科 | Power converter circuit topological structure and its control method |
| CN111917164A (en) * | 2020-07-09 | 2020-11-10 | 中国电力科学研究院有限公司 | Wireless charging system applied to transformer substation inspection robot |
| CN112865544A (en) * | 2021-02-20 | 2021-05-28 | 阳光电源股份有限公司 | Bidirectional DCDC power supply and charging pile |
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2018
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245536A (en) * | 2018-08-24 | 2019-01-18 | 李建科 | A kind of circuit topological structure suitable for the transmission of two-way near field electric energy |
| CN109245542A (en) * | 2018-10-09 | 2019-01-18 | 李建科 | A kind of symmetrical power converter circuit topological structure and its control method |
| CN109302070A (en) * | 2018-10-09 | 2019-02-01 | 李建科 | Power converter circuit topological structure and its control method |
| CN111917164A (en) * | 2020-07-09 | 2020-11-10 | 中国电力科学研究院有限公司 | Wireless charging system applied to transformer substation inspection robot |
| CN112865544A (en) * | 2021-02-20 | 2021-05-28 | 阳光电源股份有限公司 | Bidirectional DCDC power supply and charging pile |
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