CN108539820B

CN108539820B - Charging system based on wireless charging

Info

Publication number: CN108539820B
Application number: CN201810384798.2A
Authority: CN
Inventors: 刘志伟; 杭天; 张月园; 王晓丽; 结顺利; 丁志清; 胡承
Original assignee: East China Jiaotong University
Current assignee: Dragon Totem Technology Hefei Co ltd; Shenzhen Jinxiang Technology Co ltd
Priority date: 2018-04-26
Filing date: 2018-04-26
Publication date: 2021-01-26
Anticipated expiration: 2038-04-26
Also published as: CN108539820A

Abstract

The invention discloses a charging system based on wireless charging, which comprises a transmitting circuit, an N-stage coupling circuit and a receiving circuit, wherein the current and voltage stress on a power device can be reduced by adopting a multi-stage resonance coupling circuit, the service life of the device is prolonged, and the idle work in the system can be reduced, so that the efficiency of the whole system is improved, the moving range of a receiving end is enlarged, the energy loss rate is reduced by 25-30% by using the multi-stage resonance coupling circuit, and good effects on improving the vehicle-mounted energy consumption and prolonging the service life of a battery are achieved.

Description

Charging system based on wireless charging

Technical Field

The invention relates to the technical field of circuits, in particular to a charging system based on wireless charging.

Background

The wireless charging technology is one of the more mainstream new technologies in recent years, is a brand new charging mode, breaks through the traditional wired charging mode, and can enable charging to be more flexible, convenient and safe. The new charging mode has wide development and application prospects, and is highly concerned by relevant research institutions and enterprises at present. Compare in traditional on-vehicle charging, on-vehicle wireless charging is more superior in the convenience, has saved the step of plug end of getting on the bus, combines the cell phone stand function for it is more convenient that the driver charges for the cell-phone, looks over the cell-phone midway etc.. However, the wireless charger is energy-consuming, that is, the input voltage and current of the wireless charger are larger, and the output voltage and current are lower than the input voltage and current. In addition, the disadvantages of serious heat generation and slow charging of the wireless charger also reduce the use desire of the user.

Disclosure of Invention

The embodiment of the invention provides a charging system based on wireless charging, which is used for solving the problems of high energy loss, low conversion rate, slow charging and heating during charging of the conventional wireless charger.

The embodiment of the invention provides a charging system based on wireless charging, which comprises a transmitting circuit, an N-stage coupling circuit and a receiving circuit, wherein the transmitting circuit is connected with the N-stage coupling circuit;

the transmitting circuit and the N-level coupling circuit establish wireless communication connection within a certain distance, and the N-level coupling circuit and the receiving circuit establish wireless communication connection within a certain distance;

the N-stage coupling circuit transmits the energy of the transmitting circuit to the receiving circuit, wherein N is a positive integer greater than or equal to 1.

Further, as an executable scheme, the transmitting circuit comprises a power supply U, a capacitor C1 and an inductor L1, wherein the power supply U, the capacitor C1 and the inductor L1 are connected in series.

Further, as an executable scheme, when N is 2, the N-stage coupling circuit includes a first-stage coupling circuit and a second-stage coupling circuit, and the first-stage coupling circuit and the second-stage coupling circuit establish a wireless communication connection within a certain distance.

Further, as an executable scheme, the first-stage coupling circuit includes an inductor L2, an inductor L3, an inductor L4, and a capacitor C2, where the inductor L2, the inductor L3, the inductor L4, and the capacitor C2 are all connected in series, and the inductor L2 is coupled with the inductor L1;

the second-stage coupling circuit comprises an inductor L5, an inductor L6, an inductor L7 and a capacitor C3, wherein the inductor L5, the inductor L6, the inductor L7 and the capacitor C3 are connected in series, and the inductor L5 and the inductor L6 are coupled with the inductor L3 and the inductor L4 respectively.

Further, as an executable scheme, the receiving circuit includes an inductor L8, a capacitor C4 and a load battery, the inductor L8, the capacitor C4 and the load battery are all connected in series, and the inductor L8 is coupled with the inductor L7.

Further, as an executable scheme, the transmitting power of the circuit ranges from 112KHZ to 205 KHZ.

The invention has the following beneficial effects:

the embodiment of the invention provides a charging system based on wireless charging, which comprises a transmitting circuit, an N-stage coupling circuit and a receiving circuit, wherein the multistage resonance coupling circuit is adopted, so that the current and voltage stress on a power device can be reduced, the service life of the device is prolonged, the idle work in the system can be reduced, the efficiency of the whole system is improved, the moving range of a receiving end is enlarged, the multiple resonance coupling circuits are used, the energy loss rate is reduced by 25-30%, and the charging system has good effects on improving the vehicle-mounted energy consumption and prolonging the service life of a battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a charging system based on wireless charging according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.

An embodiment of the present invention provides a charging system based on wireless charging, as shown in fig. 1, which is a schematic structural diagram of the charging system based on wireless charging according to the embodiment of the present invention, where the system includes a transmitting circuit 11, an N-stage coupling circuit 12, and a receiving circuit 13;

the transmitting circuit 11 and the N-stage coupling circuit 12 establish wireless communication connection within a certain distance, and the N-stage coupling circuit 12 and the receiving circuit 13 establish wireless communication connection within a certain distance;

the N-stage coupling circuit 12 transfers the energy of the transmitting circuit 11 to the receiving circuit 13, where N is a positive integer greater than or equal to 1.

When the distance between the transmitting end and the receiving end is increased, the magnetic circuit leakage inductance between the two coils is increased, the coupling coefficient is lowered, and the transmission efficiency of the wireless charging system is lowered. The adopted multistage resonant coupling circuit can reduce the current and voltage stress on a power device, thereby prolonging the service life of the power device, reducing the idle work in the system, improving the efficiency of the whole system and enlarging the moving range of a receiving end. Multiple couplings are also advantageous over single couplings.

Specifically, in one example, the transmitting circuit includes a power source U, a capacitor C1, and an inductor L1, the power source U, the capacitor C1, and the inductor L1 being connected in series.

Further, in one example, when N is 2, the N-stage coupling circuit includes a first stage coupling circuit and a second stage coupling circuit that establish a wireless communication connection within a distance.

Specifically, the first-stage coupling circuit comprises an inductor L2, an inductor L3, an inductor L4 and a capacitor C2, wherein the inductor L2, the inductor L3, the inductor L4 and the capacitor C2 are connected in series, and the inductor L2 is coupled with an inductor L1;

It should be noted that, as shown in fig. 1, in the embodiment of the present invention, N is 2 as an example for explanation, and certainly, a single-stage coupling circuit can also achieve the technical problem to be solved by the present invention, and the circuit structure is similar, and details of the embodiment of the present invention are not described herein.

Further, the receiving circuit comprises an inductor L8, a capacitor C4 and a load battery, wherein the inductor L8, the capacitor C4 and the load battery are connected in series, and the inductor L8 is coupled with the inductor L7.

The working principle of the circuit of the embodiment of the invention is as follows:

after a power supply U is connected in series with a capacitor C1 and an inductor L1, an inductor L1 is coupled with an inductor L2, energy stored in the power supply U is output to an inductor L2 through the C2, the inductor L3 and the inductor L4 are further coupled with the inductor L5 and the inductor L6 which are connected in series, the energy stored in the power supply U is output to an inductor L7 through the C3, and the energy is transmitted to a load battery at an output end through the capacitor C4 after multiple coupling. The resonant frequency of the system is 100KHz, and the working efficiency of the system can reach 112 KHz-205 KHz in the charging process.

In an example, the circuit configuration when N is 2 is used to illustrate the setting of each parameter in the charging system according to the present invention, which can be specifically as follows:

impedance Z of U is 30 Ohm;

C1＝0.8pF；

L1＝1nH；

C2＝18pF；

L2＝1nH；

L3＝1nH；

L4＝0.1nH；

L5＝1nH；

L6＝0.1nH；

C3＝18pF；

L7＝1nH；

L8＝1nH；

C4＝0.8pF；

load cell impedance Z is 20 Ohm;

coupling coefficients between L1 and L2, between L3 and L5, between L4 and L6 and between L7 and L8 are all K-0.4, and mutual inductance coefficients are all M-0.0935.

The circuit of the invention is tested from 1MHZ to 10MHZ of power supply frequency, and the working efficiency is generally between 112KHz and 205KHz in the charging process, thereby greatly improving the utilization rate of energy.

The embodiment of the invention provides a charging system based on wireless charging, which comprises a transmitting circuit, an N-stage coupling circuit and a receiving circuit, wherein the resonant circuit is adopted, so that the current and voltage stress on a power device can be reduced, the service life of the device is prolonged, the idle work in the system can be reduced, the efficiency of the whole system is improved, the moving range of a receiving end is enlarged, the multiple resonant coupling circuit is used, the energy loss rate is reduced by 25-30%, and the charging system has good effects on improving the vehicle-mounted energy consumption and prolonging the service life of a battery.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A charging system based on wireless charging is characterized by comprising a transmitting circuit, an N-stage coupling circuit and a receiving circuit;

the N-stage coupling circuit transmits the energy of the transmitting circuit to the receiving circuit;

the transmitting circuit comprises a power supply U, a capacitor C1 and an inductor L1, wherein the power supply U, the capacitor C1 and the inductor L1 are connected in series;

when N is 2, the N-stage coupling circuit comprises a first-stage coupling circuit and a second-stage coupling circuit, and the first-stage coupling circuit and the second-stage coupling circuit establish wireless communication connection within a certain distance;

the first-stage coupling circuit comprises an inductor L2, an inductor L3, an inductor L4 and a capacitor C2, wherein the inductor L2, the inductor L3, the inductor L4 and the capacitor C2 are connected in series, and the inductor L2 is coupled with an inductor L1;

the second-stage coupling circuit comprises an inductor L5, an inductor L6, an inductor L7 and a capacitor C3, wherein the inductor L5, the inductor L6, the inductor L7 and the capacitor C3 are connected in series, and the inductor L5 and the inductor L6 are respectively coupled with the inductor L3 and the inductor L4; the receiving circuit comprises an inductor L8, a capacitor C4 and a load battery, wherein the inductor L8, the capacitor C4 and the load battery are connected in series, and the inductor L8 is coupled with an inductor L7; the emission frequency range of the circuit is 112 KHZ-205 KHZ;