CN210724332U

CN210724332U - Multi-load wireless charging device

Info

Publication number: CN210724332U
Application number: CN201922101858.8U
Authority: CN
Inventors: 陈素莹; 吴月宝; 赵进国; 孙丽兵; 李肖艳
Original assignee: Smart Power Shanghai Power Technology Co Ltd
Current assignee: Smart Power Shanghai Power Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-09
Anticipated expiration: 2029-11-29

Abstract

The utility model relates to a wireless charging device of many loads, DC power supply provides alternating voltage for the transmitting unit through high frequency contravariant unit, transmitting coil in the transmitting unit transmits the electric energy for 1# relay unit through the magnetic resonance coupling principle, 1# relay unit has receiving coil and transmitting coil simultaneously, 1# receiving coil establishes ties with 1# load, through compensating network and 1# transmitting coil "parallelly connected", 1# transmitting coil transmits the electric energy for 2# receiving coil through the ferrite board again, so reciprocating. And when the receiving unit is an N # receiving unit, the receiving coil, the load and the compensation capacitor are connected in series. Long-distance charging of n loads is realized, and wireless charging of a plurality of loads is realized by utilizing a multi-stage coupling mode; cross coupling between receiving coils is avoided, and transmission efficiency is improved; the relay coil not only transfers power to the subsequent coil, but also to a load connected thereto; when one or more loads are changed, other loads are not affected.

Description

Multi-load wireless charging device

Technical Field

The utility model relates to a charging technology, in particular to wireless charging device of many loads.

Background

Although the traditional multi-load wireless charging device can wirelessly charge a plurality of loads, the influence of cross coupling between receiving coils is ignored, the transmission power and the transmission efficiency of the system are reduced, and the working performance of the system is influenced. Meanwhile, the system performance is sensitive to the distance, the transmission distance is only a few meters at most, and when the resistance of one load changes, the power of other loads changes, which means that the load powers influence each other. Therefore, a new multi-load wireless charging device is needed to solve these problems.

Disclosure of Invention

The utility model discloses a to the problem that cross coupling influences the wireless charging efficiency of many loads between receiving coil, provided a wireless charging device of many loads, avoided the cross coupling between the receiving coil, promoted transmission efficiency.

The technical scheme of the utility model is that: a multi-load wireless charging device sequentially comprises a direct-current power supply, a high-frequency inversion unit, a transmitting unit, N-1 relay units and an N # receiving unit, wherein each relay unit comprises a receiving coil, a load, a compensation network and a transmitting coil;

the direct current power supply outputs direct current voltage, the direct current voltage is converted into high-frequency alternating current through the high-frequency inversion unit, the high-frequency alternating current is sent to the transmitting unit, the transmitting unit transmits electric energy to be coupled into a receiving coil of the 1# relay unit, the transmitting coil of the 1# relay unit transmits the electric energy to be coupled into a receiving coil of the 2# relay unit, and the electric energy is sequentially transmitted to loads of the N # receiving unit.

The compensation network is composed of two capacitors and an inductor to form a T-shaped compensation network.

The coil structure in the device is the same in shape, the litz wire is wound into a plane double-D shape, the litz wire is wound in a rectangle from outside to inside, after the litz wire is wound to the innermost layer to form a first D, the litz wire is drawn out towards the initial direction to the outermost ring and then goes downwards, a second D winding is carried out in a rectangle from inside to outside below the first D, a second D is formed after the litz wire is wound to the outermost layer, the two Ds are aligned up and down and are arranged side by side, the sizes of the two Ds are equal to the number of the coils, and the head and the tail wire heads of the litz wire winding are input into two ports of the transmitting coil.

The beneficial effects of the utility model reside in that: the utility model discloses multi-load wireless charging device utilizes the mode of multistage coupling to realize the wireless charging to a plurality of loads; cross coupling between receiving coils is avoided, and transmission efficiency is improved; the relay coil not only transfers power to the subsequent coil, but also to a load connected thereto; when one or more loads are changed, other loads are not affected.

Drawings

Fig. 1 is a block diagram of the structure of the multi-load wireless charging device of the present invention;

fig. 2 is a schematic diagram of the multi-load wireless charging device of the present invention;

fig. 3 is a schematic view of the double-D coil of the present invention.

Detailed Description

As shown in the block diagram and the schematic diagram of the structure of the multi-load wireless charging device shown in fig. 1 and 2, the device sequentially comprises a direct current power supply 1, a high-frequency inverter unit 2, a transmitting unit 3, a plurality of relay units 4 and an N # receiving unit 5. The direct current power supply 1 provides 30V direct current voltage for the device, and the high frequency contravariant unit 2 comprises the high frequency full-bridge inverter circuit that four carborundum MOSFET constitute, carries out the high frequency contravariant to direct current power supply, provides 200kHz alternating current power for transmitting coil 3. And the transmitting side compensation circuit of the transmitting unit consists of a compensation capacitor, a ferrite plate and a transmitting coil. The compensation capacitor is used for compensating reactive power and reducing loss caused by reactive power. The compensation capacitor and the transmitting coil are connected in series to be connected with the output end of the high-frequency inversion unit, and the ferrite plate and the transmitting coil are tightly arranged. The transmitting coil is made of 660-stranded litz wires in a planar double-D shape, as shown in fig. 3, the litz wires are wound from outside to inside in a rectangular shape, after the litz wires are wound to the innermost layer to form a first D, the litz wires are drawn out to the initial direction to the outermost ring and then run downwards, a second D winding is carried out below the first D in the rectangular shape from inside to outside, a second D is formed after the litz wires are wound to the outermost layer, and the head and tail wire ends of the litz wire winding are two input ports of the transmitting coil. The use of litz wire winding is beneficial for reducing the skin effect of the wire. The planar double-D shaped winding can improve the emitting area.

Each relay unit includes a receive coil, a compensation network, a transmit coil, a ferrite plate, and a load. The receiving coil of the 1# relay unit is just opposite to the transmitting coil of the transmitting unit 3 through the ferrite plate of the transmitting unit 3, the receiving coil is connected with the 1# load and the compensation network in series, the transmitting coil of the relay unit is connected with two ends of the compensation network in parallel, and the ferrite plate is placed between the transmitting coil of the 1# relay unit and the receiving coil of the 2# relay unit so as to increase the coupling effect between adjacent units. The compensation network is composed of two capacitors and an inductor to form a T-shaped compensation network, and the parameters of the inductors and the capacitors ensure that the circuit works in a resonance state, and the resonance frequency is the same as the power frequency. The distance between the transmitting coil of the transmitting unit 3 and the receiving coil of the 1# relay unit and the distance between the transmitting coil and the receiving coil of the two relay units are both 60mm, and the total number of the relay units is N-1. The N # receiving unit is composed of a receiving coil, a compensation capacitor and a load which are connected in series, and the receiving coil of the N # receiving unit is opposite to the transmitting coil of the N-1# relay unit through a ferrite plate of the N-1# relay unit. The size of each coil in the device is 160mm multiplied by 160mm, the shape is shown in figure 3, and the number of turns is 12; each ferrite plate had a size of 120mm × 120mm and a thickness of 4 mm.

The utility model discloses a theory of operation is: the direct current power supply provides alternating voltage for the transmitting unit through the high frequency contravariant unit, transmitting coil in the transmitting unit transmits the electric energy to 1# relay unit through the magnetic resonance coupling principle, 1# relay unit has receiving coil and transmitting coil simultaneously, 1# receiving coil and 1# load are established ties, through compensating network and 1# transmitting coil "parallelly connected", 1# transmitting coil transmits the electric energy to 2# receiving coil again through the ferrite board, so go on. And when the receiving unit is an N # receiving unit, the receiving coil, the load and the compensation capacitor are connected in series. Therefore, long-distance charging of n loads is achieved, and meanwhile, the transmission efficiency of the system is guaranteed due to various structural designs.

Claims

1. A multi-load wireless charging device is characterized by sequentially comprising a direct-current power supply, a high-frequency inversion unit, a transmitting unit, N-1 relay units and an N # receiving unit, wherein each relay unit comprises a receiving coil, a load, a compensation network and a transmitting coil;

2. The multi-load wireless charging device according to claim 1, wherein the compensation network is composed of two capacitors and an inductor, and forms a "T-shaped" compensation network.

3. The multi-load wireless charging device according to claim 1 or 2, wherein the coil structures in the device are identical in shape, the litz wire is wound into a planar "double-D" shape, the litz wire is wound into a rectangle from outside to inside, after the litz wire is wound to the innermost layer to form a first D, the litz wire is drawn out towards the initial direction to the outermost layer and then goes downwards, a second D winding is performed under the first D from inside to outside to form a second D after the litz wire is wound to the outermost layer, the two Ds are aligned side by side up and down, the sizes of the two Ds and the number of the coils are equal, and the head and tail ends of the litz wire winding are two input ports of the transmitting coil.