CN113595261A - Circuit topology for LCL compensation of dynamic wireless power supply multiplexing transmitting guide rail - Google Patents
Circuit topology for LCL compensation of dynamic wireless power supply multiplexing transmitting guide rail Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention provides a circuit topology for LCL compensation of a dynamic wireless power supply multiplexing transmitting guide rail, which comprises a direct current bus voltage UDCSwitching tube S of inverter source1、S2、S3、S4And S12The LCL compensation circuit and the receiving end; the LCL compensation circuit comprises a self-inductance L of two adjacent transmitting guide rails1And L2The resonance compensation capacitor C12(ii) a The receiving end comprises a receiving end self-inductance LsAnd a compensation capacitor CsThe multiplexing transmitting guide rail compensates for the adjacent guide rail without additionally configuring compensation inductance for each section of guide rail; multiplexing an inversion source bridge arm, and driving two sections of guide rails by adopting one inversion source; and the resonant capacitor is multiplexed, and only one resonant capacitor needs to be configured for the two sections of guide rails. The system is highly multiplexed, the use of devices is reduced, the volume and the cost of the system are reduced, the loss is reduced, and the system efficiency is improved.
Description
Technical Field
The invention belongs to the field of wireless power transmission and dynamic wireless power supply, and particularly relates to a circuit topology for LCL compensation of a dynamic wireless power supply multiplexing transmitting guide rail.
Background
The dynamic wireless power supply technology can supplement electric energy in real time in the running process of the electric automobile, so that the endurance mileage can be increased, the proportion of a power battery is reduced, the defects caused by the traditional wired charging mode are overcome, and the dynamic wireless power supply technology has important research value. The development is continuously towards the direction of high power, long distance and long mileage. The research on the dynamic wireless power supply technology at home and abroad is mainly developed around a long guide rail type and multi-coil distributed magnetic coupling mechanism, and a series of achievements are obtained by researching the problems of the structure and the characteristics of the dynamic wireless power supply technology, the configuration mode of a magnetic core, the characteristics of coupling performance, the transverse offset capability, the resonance compensation topology, the dynamic switching method, the power fluctuation in the advancing process and the like. In addition, some dynamic wireless power supply projects have developed a complete set of systems, establish a plurality of dynamic wireless power supply test lines, and gradually put into practical operation, so that it is really possible that the dynamic wireless power supply technology changes the traditional wired charging mode.
The transmitting end in the dynamic wireless power supply system usually adopts an S compensation topology, the topology has few resonance elements, low cost, small loss and high efficiency, and a stable traveling wave magnetic field can be established in space by matching with the constant current control of the voltage type inversion source output, so that the receiving end can induce voltage with stable effective value to realize wireless power supply. However, when the receiving end does not enter the upper part of the guide rail, the transmitting end is in a no-load state, the reflection impedance is zero, the internal resistance of the resonant cavity is very small, and the resonant cavity is approximately in a short-circuit state, so that the output voltage of the power supply is required to be very small. When the receiving end enters the upper part of the transmitting guide rail to reach a complete coupling state and is close to full load output, the reflecting impedance is very large at the moment, and the output voltage of the power supply is required to be very high. Therefore, when the transmitting terminal adopts S topology, the requirement on the output voltage variation range of the power supply is wide. In addition, the time of the receiving end entering the guide rail is influenced by the vehicle speed, and the output voltage of the power supply is required to have a high adjusting speed so as to meet the power requirement caused by the change of the vehicle position and improve the design difficulty of the power supply.
The LCL compensation topology has the hardware constant current characteristic, is widely applied to the field of static wireless charging, and has certain advantages when being applied to dynamic wireless power supply. The topology is provided with a voltage type inversion source to generate a transmitting current which has constant amplitude and is irrelevant to the load, so that the automatic matching of the load power can be realized, the adjusting speed is high, and the stability is high. And the LCL topology has the function of impedance transformation, when the receiving end does not enter the upper part of the guide rail, although the reflection impedance is zero, the equivalent load of the inverted source after transformation is infinite, the output current is almost zero, and the no-load state is allowed to exist. However, since the LCL compensation topology has a closed resonant loop and the loop impedance is small, the energized transmitting rail induces a certain voltage in another set of adjacent transmitting rails, and a large current is generated in the closed resonant loop, which may cause a breakdown of the capacitor or the switching tube. And LCL compensation topology needs to match a compensation inductor with inductance and current endurance equal to those of a transmitting guide rail, the inductor has a large volume, more loss is introduced, the cost is improved, and the system efficiency is reduced.
In addition, the dynamic wireless power supply switching method mainly comprises four schemes of single-source segmented power supply, multi-source independent power supply, multi-source mixed alternate power supply and the like.
(1) The single-source segmented power supply means that all guide rails are connected in parallel on the same power supply, the power supply is always in an operating state, and the switching of the guide rails is realized through the switching of a series switch. The mode has the advantages of simple structure, low cost, more power supply lines and longer length, the switch is in a hard switching state and is easy to burn out devices, and the difficulty in opening the two guide rails is higher.
(2) The multi-source independent power supply scheme refers to that each section of power supply guide rail is provided with one transmitting power supply, and the mode omits a change-over switch, so that the structure is simple, the switching is easy, but the number of the power supplies is too much, and the cost is higher.
(3) The multi-source hybrid power supply scheme is an improvement on single-source segmented power supply, reduces the number of segments of each power supply driving guide rail so as to reduce the pressure of a single power supply, but the problems of hard switching and simultaneous power supply of two segments of guide rails are still not solved locally.
(4) The multi-source mixed alternative power supply scheme adopts two power supplies to be alternately connected with the transmitting guide rail, reduces the number of the power supplies, allows two adjacent sections of guide rails to work simultaneously, reduces the cost and improves the stability of the receiving power.
In summary, for the transmitting end of the dynamic wireless power supply system, a compensation topology which can work at the same time with no load, fast response, small volume, low cost and high efficiency, and a switching method which has less power supply, soft switching and multiple guide rails need to be further researched.
Disclosure of Invention
In order to solve the problems, the invention provides a circuit topology for LCL compensation of a dynamic wireless power supply multiplexing transmitting guide rail, wherein the multiplexing transmitting guide rail is used for compensating adjacent guide rails without additionally configuring compensation inductance for each section of guide rail; multiplexing an inversion source bridge arm, and driving two sections of guide rails by adopting one inversion source; and the resonant capacitor is multiplexed, and only one resonant capacitor needs to be configured for the two sections of guide rails. The system is highly multiplexed, the use of devices is reduced, the volume and the cost of the system are reduced, the loss is reduced, and the system efficiency is improved.
The invention is realized by the following scheme:
a circuit topology for dynamic wireless power supply multiplexing transmission guide rail LCL compensation:
the circuit topology comprises a DC bus voltage UDCSwitching tube S of inverter source1、S2、S3、S4And S12The LCL compensation circuit and the receiving end;
the LCL compensation circuit comprises a self-inductance L of two adjacent transmitting guide rails1And L2The resonance compensation capacitor C12；
The receiving end comprises a receiving end self-inductance LsAnd a compensation capacitor Cs；
Resonance compensation capacitor C12One end of each of the first and second inductors is connected to the inductor L1And L2Connected, capacitor C12The other end of the first and second transistors and an inversion source switch tube S12Connecting;
inductor L1The other end of the first and second switches is respectively connected with an inversion source switch tube S1、S2One end of the two ends are connected; inductor L2The other end of the first and second switches is respectively connected with an inversion source switch tube S3、S4One end of the two ends are connected;
inversion sourceSwitch tube S1And S3The other end of the DC bus voltage UDCThe positive electrodes of the two electrodes are connected;
inverter source switch tube S2、S12And S4The other end of the DC bus voltage UDCThe negative electrodes are connected;
the receiving end is in a moving state and can be in L1And L2Moves above.
Further, the inversion source switch tube S2And S12Are connected in reverse series when L2When operating as a launching rail, L1And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
Further, the inversion source switch tube S4And S12Are connected in reverse series when L1When operating as a launching rail, L2And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
Further, the resonance condition formula that the compensation topology of the circuit satisfies is as follows:
where ω is the angular frequency of the alternating current.
Further, there are two operating states of the circuit:
state 1: self-inductance L when receiving end is on guide rail1When the upper part is in the upper position, the inversion source switch tube S1Off, S2And S12Constant on, S3And S4Chopping using PWM, at this time L1Operating as a launching rail, L2Working as a compensation inductor;
state 2: self-inductance L when receiving end is on guide rail2When the upper part is in the upper position, the inversion source switch tube S3Off, S4And S12Constant on, S1And S2Chopping using PWM, at this time L2Operating as a launching rail, L1Operating as a compensating inductance.
Further, an inductor L is provided1And L2Is x0，x0Before position, L1Coupling stronger than L2The circuit operates in state 1; x is the number of0After position, L2Coupling stronger than L1The circuit operates in state 2.
Further, an inductor L is provided1And L2Has a coupling interval of x1～x2，x1～x2The size of the space is determined by the distance between the two launching guide rails;
at x1Before the position, only the guide rail L1Coupling with the receiving end, x2After positioning, only the guide rail L2There is a coupling to the receiving end.
The invention has the beneficial effects
(1) The invention reuses the transmitting guide rail as the compensation inductor, thereby reducing the use of two compensation inductors and one compensation capacitor; the inverter source bridge arm is multiplexed, and one power supply is adopted to drive two sections of transmitting guide rails, so that the use of three switching tubes is reduced, the cost and the volume are reduced, the system loss is reduced, and the efficiency is improved;
(2) the equivalent impedance of the transmitting end is transformed, so that the output impedance of the power supply is larger, and the load can obtain energy. Meanwhile, the transmitting end is allowed to work in an idle state, and when the receiving end does not enter a charging range, the output voltage of the power supply is zero, so that the design difficulty of the power supply is reduced, and the robustness is improved;
(3) the invention has the characteristic of hardware constant current, the emission current is irrelevant to the load condition, the self-adaption of the output power can be realized, the constant current control difficulty is reduced, and the response speed is improved;
(4) according to the invention, the reverse series switch tube is connected into the closed resonant cavity, so that the hidden danger of breakdown of a resonant device and the switch tube caused by current induction in the resonant cavity when the adjacent guide rail on the other side works can be avoided. Meanwhile, a thermal switching mode is adopted between the two sections of guide rails, so that breakdown caused by the fact that a switching tube generates an excessively high turn-off voltage when the current is large is avoided, and reliability is improved.
Drawings
Fig. 1 is a circuit topology diagram of a dynamic wireless power supply multiplexing transmission guide rail LCL compensation of the present invention;
FIG. 2 is a diagram of mode 1 of operation of the present invention;
FIG. 3 is the mode of operation 2 of the present invention;
fig. 4 is a curve of mutual inductance with position variation of two transmitting terminals and two receiving terminals of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A circuit topology for dynamic wireless power supply multiplexing transmission guide rail LCL compensation: as shown in fig. 1;
the circuit topology comprises a DC bus voltage UDCSwitching tube S of inverter source1、S2、S3、S4And S12The LCL compensation circuit and the receiving end;
the LCL compensation circuit comprises a self-inductance L of two adjacent transmitting guide rails1And L2The resonance compensation capacitor C12；
The receiving end comprises a receiving end self-inductance LsAnd a compensation capacitor Cs；
Resonance compensation capacitor C12One end of each of the first and second inductors is connected to the inductor L1And L2Connected, capacitor C12The other end of the first and second transistors and an inversion source switch tube S12Connecting;
inductor L1The other end of the first and second switches is respectively connected with an inversion source switch tube S1、S2One end of the two ends are connected; inductor L2The other end of the first and second switches is respectively connected with an inversion source switch tube S3、S4One end of the two ends are connected;
inverter source switch tube S1And S3The other end of the DC bus voltage UDCThe positive electrodes of the two electrodes are connected;
inverter source switch tube S2、S12And S4The other end of the DC bus voltage UDCThe negative electrodes are connected;
the receiving end is in a moving state and can be in L1And L2Moves above.
Further, the inversion source switch tube S2And S12Are connected in reverse series when L2When operating as a launching rail, L1And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
Further, the inversion source switch tube S4And S12Are connected in reverse series when L1When operating as a launching rail, L2And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
The resonance condition formula that the compensation topology of the circuit satisfies is as follows:
where ω is the angular frequency of the alternating current.
Two operating states of the circuit exist:
state 1: as shown in FIG. 2, the self-inductance L of the receiving end at the guide rail1When the upper part is in the upper position, the inversion source switch tube S1Off, S2And S12Constant on, S3And S4Chopping using PWM, at this time L1Operating as a launching rail, L2Working as a compensation inductor; as shown in fig. 2
State 2: as shown in FIG. 3, the self-inductance L of the receiving end at the guide rail2When the upper part is in the upper position, the inversion source switch tube S3Off, S4And S12Constant on, S1And S2Chopping using PWM, at this time L2Operating as a launching rail, L1Operating as a compensating inductance.
As shown in FIG. 4, an inductor L is provided1And L2Is x0，x0Before position, L1Coupling stronger than L2The circuit operates in state 1; x is the number of0After position, L2Coupling stronger than L1The circuit operates in state 2.
Provided with an inductor L1And L2Has a coupling interval of x1～x2，x1～x2The size of the space is determined by the distance between the two launching guide rails;
at x1Before the position, only the guide rail L1Coupling with the receiving end, x2After positioning, only the guide rail L2There is a coupling to the receiving end.
The invention can be applied to dynamic wireless power supply systems of movable electric equipment such as electric automobiles, rail transit, Automatic Guided Vehicles (AGV), mining transport vehicles, monorail cranes, inspection robots and the like. Two sections of power supply guide rails are connected in series, and matching resonant capacitors are connected to form an LCL topological form. By adopting the inverter power supply circuit topology and the control method, the functions of mutual compensation of the transmitting guide rails, soft switching of the transition region and quick self-adaption of output power can be realized, and meanwhile, the device is highly multiplexed, so that the use number of the device can be reduced, the cost is reduced, the loss is small, the efficiency is improved, the breakdown hidden danger of the device is avoided, and the reliability of the system is improved.
In addition, there is another alternative structure for the present compensation topology. Because the magnitude of the emission current is inversely proportional to the self-inductance value of the guide rail, if the self-inductance is large, the requirement of large current is difficult to meet, equal compensation capacitors can be respectively connected in series with the emission guide rails L1 and L2, so that the equivalent self-inductance is reduced, the current upper limit of the emission guide rails is improved, and the requirement of output power is met.
The circuit topology for dynamic wireless power supply multiplexing transmission guide rail LCL compensation proposed by the present invention is introduced in detail above, and the principle and the implementation of the present invention are explained, and the above description of the embodiment is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A circuit topology for dynamic wireless power supply multiplexing transmission guide rail LCL compensation is characterized in that:
the circuit topology comprises a DC bus voltage UDCSwitching tube S of inverter source1、S2、S3、S4And S12The LCL compensation circuit and the receiving end;
the LCL compensation circuit comprises a self-inductance L of two adjacent transmitting guide rails1And L2The resonance compensation capacitor C12；
The receiving end comprises a receiving end self-inductance LsAnd a compensation capacitor Cs；
Resonance compensation capacitor C12One end of each of the first and second inductors is connected to the inductor L1And L2Connected, capacitor C12The other end of the first and second transistors and an inversion source switch tube S12Connecting;
inductor L1The other end of the first and second switches is respectively connected with an inversion source switch tube S1、S2One end of the two ends are connected; inductor L2The other end of the first and second switches is respectively connected with an inversion source switch tube S3、S4One end of the two ends are connected;
inverter source switch tube S1And S3The other end of the DC bus voltage UDCThe positive electrodes of the two electrodes are connected;
inverter source switch tube S2、S12And S4The other end of the DC bus voltage UDCThe negative electrodes are connected;
the receiving end is in a moving state and can be in L1And L2Moves above.
2. The circuit topology of claim 1, wherein: inverter source switch tube S2And S12Are connected in reverse series when L2When operating as a launching rail, L1And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
3. The circuit topology of claim 1, wherein: inverter source switch tube S4And S12Are connected in reverse series when L1When operating as a launching rail, L2And C12The formed closed resonant circuit is disconnected, and no induction current is generated in the resonant circuit.
4. The circuit topology of claim 1, wherein: the resonance condition formula that the compensation topology of the circuit satisfies is as follows:
where ω is the angular frequency of the alternating current.
5. The circuit topology of claim 1, wherein: two operating states of the circuit exist:
state 1: self-inductance L when receiving end is on guide rail1When the upper part is in the upper position, the inversion source switch tube S1Off, S2And S12Constant on, S3And S4Chopping using PWM, at this time L1Operating as a launching rail, L2Working as a compensation inductor;
state 2: self-inductance L when receiving end is on guide rail2When the upper part is in the upper position, the inversion source switch tube S3Off, S4And S12Constant on, S1And S2Chopping using PWM, at this time L2Operating as a launching rail, L1Operating as a compensating inductance.
6. The circuit topology of claim 5, wherein: provided with an inductor L1And L2Is x0，x0Before position, L1Coupling stronger than L2The circuit operates in state 1; x is the number of0After position, L2Coupling stronger than L1The circuit operates in state 2.
7. The circuit topology of claim 5, wherein: provided with an inductor L1And L2Has a coupling interval of x1～x2，x1～x2The size of the space is determined by the distance between the two launching guide rails;
at x1Before the position, only the guide rail L1Coupling with the receiving end, x2After positioning, only the guide rail L2There is a coupling to the receiving end.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731139A (en) * | 2020-05-19 | 2020-10-02 | 华为技术有限公司 | Wireless charging receiving end, transmitting end, system, control method and electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731139A (en) * | 2020-05-19 | 2020-10-02 | 华为技术有限公司 | Wireless charging receiving end, transmitting end, system, control method and electric automobile |
Non-Patent Citations (2)
| Title |
|---|
| SHAOCONG ZHOU等: "A multiplexing LCL module using individual transmitters for dynamic wireless charging of electric vehicles", 《2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)》, pages 2728 - 2735 * |
| SHAOCONG ZHOU等: "Dynamic Wireless Power Transfer System for Electric Vehicles Employing Multiplexing LCC Modules With Individual Transmitters", 《IEEE ACCESS》, pages 62514 - 62527 * |
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