CN112994264A - Wireless power transmission system - Google Patents
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- CN112994264A CN112994264A CN201911291909.6A CN201911291909A CN112994264A CN 112994264 A CN112994264 A CN 112994264A CN 201911291909 A CN201911291909 A CN 201911291909A CN 112994264 A CN112994264 A CN 112994264A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000010280 constant potential charging Methods 0.000 claims description 3
- 238000010277 constant-current charging Methods 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 238000007600 charging Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a wireless power transmission system, this wireless power transmission system includes: the system comprises a transmitting end and a receiving end arranged on an electric automobile; the transmitting end includes: the system comprises an inversion unit, a first compensation network and a transmitting coil; the inversion unit is connected with a direct current source and is connected with the first compensation network and the transmitting coil in series; the receiving end includes: the receiving coil, the second compensation network, the rectifying unit and the DC/DC conversion unit are sequentially connected in series. The electric energy transmission device is based on the electromagnetic induction principle and has the advantages of being safe, convenient and fast and high in efficiency.
Description
Technical Field
The present application relates to an electric vehicle charging technology, and more particularly, to a wireless power transmission system.
Background
As is well known, the driving range of an electric vehicle is mainly limited by the battery capacity, at present, the basic charging facility is far less popular than a gas station, and the electric vehicle needs to be charged for a long time, so that the popularization of the electric vehicle is limited to a certain extent.
Disclosure of Invention
To the problems in the prior art, the application provides a wireless power transmission system to realize the zero voltage switching-on of a full-bridge inverter switch tube in a wide load range, and improve the wireless power transmission efficiency.
In order to solve the technical problem, the application provides the following technical scheme:
in one aspect, the present application provides a wireless power transmission system, including: the system comprises a transmitting end and a receiving end arranged on an electric automobile; wherein,
the transmitting end includes: the system comprises an inversion unit, a first compensation network and a transmitting coil; the inversion unit is connected with a direct current source and is connected with the first compensation network and the transmitting coil in series;
the receiving end includes: the receiving coil, the second compensation network, the rectifying unit and the DC/DC conversion unit are sequentially connected in series.
Further, the inverter unit is a full-bridge inverter circuit.
Further, the rectifying unit is a full-bridge uncontrolled rectifying circuit.
Further, the first compensation network and the first compensation network form an LCC-S type compensation structure, the first compensation network is an LCC type structure, and the second compensation network is a serial S type structure.
Furthermore, the transmitting coil and the receiving coil are both litz wire-wound planar coils.
Further, the DC/DC conversion unit is a Buck chopper circuit.
Furthermore, the Buck chopper circuit is composed of two IGBT switching tubes, a filter inductor, a filter capacitor and a battery equivalent load and is used for constant voltage or constant current charging according to the state of the battery.
Further, the inverter unit is composed of 4 MOSFETs.
Further, the rectifying unit is composed of 4 rectifying diodes.
Further, the first compensation network is composed of a series compensation inductor, a parallel compensation capacitor and a first series compensation capacitor; the second compensation network is composed of a second series compensation capacitor.
Further, the magnitude of the first series compensation capacitance value may determine an input impedance characteristic of the wireless power transmission system.
The electric energy transmission device is based on the electromagnetic induction principle and has the advantages of being safe, convenient and fast and high in efficiency. By the aid of the method, the input impedance can be weakly induced by changing the series compensation capacitance value in the transmitting terminal compensation network, zero voltage switching-on of the full-bridge inverter switching tube is achieved within a wide load range, and wireless power transmission efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wireless power transmission system according to the present application;
FIG. 2 is a main circuit topology diagram of a wireless power transfer system;
FIG. 3 is a schematic diagram of a circuit mutual inductance model of an LCC-S type compensation structure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The application provides a wireless power transmission system, this wireless power transmission system includes: the transmitting terminal and the receiving terminal arranged on the electric automobile.
The transmitting end may be provided on the ground or on a platform, such as a platform for charging or a charging pile, etc. As shown in fig. 1, the transmitting end includes: an inversion unit 101, a compensation network 102 and a transmitting coil 103. The inverter unit 101 is connected to a dc source and is connected in series with the compensation network 102 and the transmitter coil 103.
As shown in fig. 1, the receiving end includes: a receiving coil 104, a compensation network 105, a rectifying unit 106 and a DC/DC converting unit 107 connected in series in this order.
As shown in fig. 1, a dc source (high voltage dc power supply) forms a positive and negative voltage square wave with a fixed frequency through an inverter unit 101, and flows into a primary side transmitting coil 103 through a primary side compensation network 102, and the amplitude of the ac current of the transmitting coil 103 is constant. According to the electromagnetic induction principle, the receiving coil 105 on the secondary side induces a stable alternating voltage, and the constant direct voltage is obtained through the compensation network 105 and the rectifying unit 106.
As a novel charging technology, the wireless power transmission has no physical contact with a load, avoids the problems of electric sparks, contact abrasion and the like, and has the characteristics of safety, reliability and convenience. High-power and high-efficiency wireless charging is the development trend of future electric vehicles. The wireless power transmission system is used for transmitting power based on the electromagnetic induction principle and has the advantages of being safe, convenient and fast and high in efficiency.
In an embodiment, the inverter unit 101 may be a full bridge inverter circuit. In specific implementation, the inverter unit may be composed of 4 MOSFETs.
In one embodiment, the rectifying unit 106 may be a full-bridge uncontrolled rectifying circuit. In specific implementation, the rectifying unit 106 is composed of 4 rectifying diodes.
In an embodiment, the transmitting coil 103 and the receiving coil 104 may be both litz wire-wound planar coils, and the application is not limited in this order.
In one embodiment, the DC/DC conversion unit is a Buck chopper circuit. During specific implementation, the Buck chopper circuit can be composed of two IGBT switching tubes, a filter inductor, a filter capacitor and a battery equivalent load and is used for constant-voltage or constant-current charging according to the state of a battery.
In one embodiment, the first compensation network and the first compensation network form an LCC-S type compensation structure, wherein the first compensation network is an LCC type structure, and the second compensation network is a serial S type structure. In specific implementation, the compensation network 102 may be composed of a series compensation inductor, a parallel compensation capacitor, and a first series compensation capacitor; the compensation network 105 may be comprised of a second series compensation capacitor. The magnitude of the first series compensation capacitance value may determine an input impedance characteristic of the wireless power transmission system. In this application, through adjusting first series compensation capacitance value, can make wireless power transmission system input impedance be the weak inductance nature, realize that the inverter zero voltage switches on.
FIG. 2 is a main circuit topology diagram of a wireless power transmission system, and as shown in FIG. 2, an inverter unit 101 is composed of 4 MOSFETs (S, respectively)1To S4) Composition is carried out; the compensation network 102 is composed of series compensation inductors Lf1Parallel compensation capacitor Cf1Series compensation capacitor C1The compensation network 105 is composed of series compensation capacitors C2Composition is carried out; the rectifying unit 106 is composed of four rectifying diodes (D respectively)1To D4) Composition is carried out; co1For the filter capacitor, the Buck wave-spreading circuit is composed of two IGBT switching tubes (Q)1And Q2) Filter inductor LoFilter capacitor Co2And a battery equivalent load R.
As shown in FIG. 2, the high voltage DC power supply forms a positive and negative voltage square wave with fixed frequency through a full bridge inverter circuit, and then flows into a primary side transmitting coil L through a primary side LCC compensation network1The amplitude of the alternating current of (a) is constant. Based on the principle of electromagnetic induction, the secondary receiving coil L2And inducing stable alternating voltage, and obtaining constant direct voltage through a secondary side compensation network and a full-bridge uncontrolled rectifying circuit.
In order to realize zero-voltage switching of an inverter unit, the requirement that the current phase lags behind the voltage is met, the current at the turn-off moment is accurately controlled, and the parasitic parallel capacitor (C) of a switch tube (MOSFET) is ensured to be connected by the resonant current before the switch tube is turned onS1、CS2、CS3、CS4) The charge of (2) is pumped away. Based on this, thisApplication is realized by changing series compensation capacitor C in transmission terminal compensation network1The value of the voltage value is used for realizing that the input impedance of the wireless power transmission system is weak, so that zero voltage switching-on of a full-bridge inverter switching tube is realized in a wide load range, and the wireless power transmission efficiency is improved.
In addition, a Buck direct current converter (a Buck wave-spreading circuit) is added behind the secondary rectifying circuit, closed-loop control can be performed on the battery load according to different requirements of the load, the duty ratio of a switching tube of the Buck wave-spreading circuit is changed, and constant-voltage or constant-current control over the battery load can be achieved.
FIG. 3 is a schematic diagram of a circuit mutual inductance model of an LCC-S type compensation structure. The wireless charging industry standard for automobiles, SAE-J2954TM, as set forth by SAE, the American society of automotive Engineers, states that: the working frequency of the wireless charging system of the electric automobile is 85 kHz. Since ω is 2 π f, at the frequency resonance point ω is0And (b) satisfies the following relation:
in the above formula, L1Is a transmitting coil, L2For the receiving coil, Lf1To compensate for inductance in series, Cf1To parallel compensate capacitance, C1And C2Is a series compensation capacitor.
When the compensation network parameters meet the resonance relation, the input impedance of the system is pure resistance, the current of the primary side transmitting coil is constant, the inductive voltage of the receiving end is constant, and the system is irrelevant to the load and the coupling coefficient.
In this application, to realize soft switching, the output current of the inverter unit should lag behind the output voltage, i.e. the input impedance of the load network is inductive. For high-frequency resonance, the capacitance is more convenient to adjust than the inductance value, the occupied volume is smaller, and for an LCC-S structure, the secondary side is detuned by adjusting the secondary side parameters, so the primary side circuit parameters should be adjusted. Due to the primary side Lf、CfA resonant relationship, so that the series capacitance C is adjusted1More suitably. The primary side series compensation capacitor C is reduced1To make the system input resistanceThe resistance is weak inductance, the parasitic junction capacitance of the MOS tube is completely discharged in dead time, zero voltage switching-on is realized, and the transmission efficiency of the whole wireless power transmission system is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the present application are explained by applying specific embodiments in the present application, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, 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 application.
Claims (11)
1. A wireless power transfer system, comprising: the system comprises a transmitting end and a receiving end arranged on an electric automobile; wherein,
the transmitting end includes: the system comprises an inversion unit, a first compensation network and a transmitting coil; the inversion unit is connected with a direct current source and is connected with the first compensation network and the transmitting coil in series;
the receiving end includes: the receiving coil, the second compensation network, the rectifying unit and the DC/DC conversion unit are sequentially connected in series.
2. The wireless power transmission system according to claim 1, wherein the inverter unit is a full-bridge inverter circuit.
3. The wireless power transmission system of claim 1, wherein the rectification unit is a full-bridge uncontrolled rectification circuit.
4. The wireless power transmission system of claim 1, wherein the first compensation network and the first compensation network form an LCC-S type compensation structure, the first compensation network is an LCC type structure, and the second compensation network is a serial S type structure.
5. The wireless power transfer system of claim 1 wherein the transmitter coil and the receiver coil are litz wire wound planar coils.
6. The wireless power transmission system according to claim 1, wherein the DC/DC conversion unit is a Buck chopper circuit.
7. The wireless power transmission system of claim 6, wherein the Buck chopper circuit is composed of two IGBT switching tubes, a filter inductor, a filter capacitor and a battery equivalent load, and is used for constant voltage or constant current charging according to the battery state.
8. The wireless power transmission system according to claim 1 or 2, wherein the inverter unit is composed of 4 MOSFETs.
9. The wireless power transmission system according to claim 1 or 3, wherein the rectifying unit is composed of 4 rectifying diodes.
10. The wireless power transmission system according to claim 1 or 4, wherein the first compensation network is composed of a series compensation inductance, a parallel compensation capacitance, and a first series compensation capacitance; the second compensation network is composed of a second series compensation capacitor.
11. The wireless power transfer system of claim 10 wherein the first series compensation capacitance value is sized to determine an input impedance characteristic of the wireless power transfer system.
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| CN201911291909.6A CN112994264A (en) | 2019-12-16 | 2019-12-16 | Wireless power transmission system |
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| CN201911291909.6A CN112994264A (en) | 2019-12-16 | 2019-12-16 | Wireless power transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300442A (en) * | 2021-06-28 | 2021-08-24 | 上海电机学院 | Bidirectional wireless power transmission system and method based on electric automobile |
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