白丝美女被狂躁免费视频网站,500av导航大全精品,yw.193.cnc爆乳尤物未满,97se亚洲综合色区,аⅴ天堂中文在线网官网

Charging device having small loop transmission coils for wireless charging a target device

專利號(hào)
US10097031B2
公開(kāi)日期
2018-10-09
申請(qǐng)人
Hong Kong Applied Science and Technology Research Institute Company Limited（HK Shatin）
發(fā)明人
Yan Liu; Jun Chen
IPC分類
H02J7/00; H02J7/02
技術(shù)領(lǐng)域
coil,coils,antenna,loop,charging,small,primary,in,wireless,pair
地域： Hong Kong

摘要

A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.

說(shuō)明書(shū)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
BACKGROUND OF THE INVENTION

1. Field of the Invention

Aspects of the present invention relate to a charging device having small loop transmission coils to wirelessly charge target devices such as mobile telephones and tablets. More particularly, aspects of the present invention relate to a wireless charging device using small loop transmission coils having different sizes and connected in parallel.

2. Description of the Related Art

Recent years have seen tremendous growth in wireless charging applications, and this trend is expected to continue at least into the near future. Wireless charging is a technology where electromagnetic induction is used to transmit power through air, without the use of power cords or conductors. A wireless charging system includes: i) a charger, i.e., a power transmitter unit (PTU) with a primary coil, and ii) a target device to be charged (charged device), i.e., a power receiver unit (PRU) with a secondary coil. Power in the charger is transferred to the target device to be charged through the electromagnetically coupled primary and secondary coils, and the induced current may be further processed and used to charge the battery of the target device. Energy is transmitted through inductive coupling from the charger to the target device, which may use that energy to charge batteries or as direct operational power for the target device.

權(quán)利要求

1
What is claimed is:1. A charging device to wirelessly charge a target device, comprising:a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field;a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; andwherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna, andwherein inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency f, the inductance Lloop and capacitance Ctotal are determined by formula (1) below: f = 1 2 ? ? π ? L loop ? C total . ( 1 ) 2. The charging device of claim 1, wherein the size of each of the metallic small loop transmission coils is predesigned to enable the corresponding small loop transmission coil to be resonant with the coil antenna in response to a distance between the target device and the coil antenna being a corresponding predefined target distance.3. The charging device of claim 1, wherein each of the first and second metallic small loop transmission coils of the pairs of metallic small loop transmission coils is one of a rectangle, circle, polygon, square, triangle or any combination thereof, and each first metallic transmission loop coil has a different shape from the corresponding second metallic transmission loop coil.4. The charging device of claim 1, further comprising capacitors respectively connected to each small loop transmission coil in series.5. The charging device according to claim 4, wherein the capacitors are gaps.6. The charging device according to claim 4, wherein the capacitors are ceramic capacitors.7. The charging device of claim 1, wherein the first one of each pair of metallic small loop transmission coils is located within the second one of the pair.8. The charging device according to claim 1, wherein the first one of each pair of metallic small loop transmission coils is smaller than the second one of the pair, and located to a side of the second one of the pair.9. The charging device according to claim 1, wherein the first ones of each pair of small loop transmission coils have the same size and shape, and the second ones of each pair of small loop transmission coils have the same size and shape, and the ones of the same small loop pair have a different size and different shape.10. The charging device of claim 1, wherein the metallic small loop transmission coils are designed in accordance with:determining a first set of D1, D2, W and S for the first one of each pair of metallic small loop transmission coils based upon a size of the coil antenna and a quantity of the pairs of metallic small loop transmission coils and calculating a first loop inductance;calculating a first series capacitor value for the first capacitor of the first metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the first capacitor;determining a second set of D1, D2, W and S for the second one of each pair of metallic small loop transmission coils based upon a size of the first one of the pair of metallic small loop transmission coils and calculating a second loop inductance;calculating a second series capacitor value for the second capacitor of the second metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the second capacitor based upon predetermined distances set for between the coil antenna and the target device; andcombining the first and second metallic small loop transmission coils in parallel, and fine tune the first and second capacitors.11. The charging device according to claim 1, wherein each pair of metallic small loop transmission coils comprises at least 2 metallic small loop transmission coils connected in parallel to each other.12. The charging device according to claim 1, wherein each pair of metallic small loop transmission coils comprises at least 3 metallic small loop transmission coils connected in parallel to each other.13. A method of wirelessly charging a target device, comprising:generating a first magnetic field from a second surface of a coil antenna, the coil antenna having a first surface facing a first direction at which the target device is placed for charging and the second surface facing an opposite direction from the first direction; andgenerating a second magnetic field using a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna in response to the first magnetic field, the first and second magnetic fields being directed in the first direction;wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antennawherein capacitors are respectively connected to each small loop transmission coil in series, andwherein inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency f, the inductance Lloop and capacitance Ctotal are determined by formula (1) below: f = 1 2 ? ? π ? L loop ? C total . ( 1 ) 14. The method of claim 13, wherein the size and/or shape of each of the metallic small loop transmission coils are predesigned to enable the corresponding small loop transmission coil to be resonant with the coil antenna in response to a distance between the target device and the coil antenna being a corresponding predefined target distance.15. The method of claim 13, wherein each of the first and second metallic small loop transmission coils of the pairs of metallic small loop transmission coils is one of a rectangle, circle, polygon, square, triangle or any combination thereof, and each first metallic transmission loop coil has a different shape from the corresponding second metallic transmission loop coil.16. The method of claim 13, wherein the metallic small loop transmission coils are designed in accordance with:determining a first set of D1, D2, W and S for the first one of each pair of metallic small loop transmission coils based upon a size of the coil antenna and a quantity of the pairs of metallic small loop transmission coils and calculating a first loop inductance;calculating a first series capacitor value for the first capacitor of the first metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the first capacitor;determining a second set of D1, D2, W and S for the second one of each pair of metallic small loop transmission coils based upon a size of the first one of the pair of metallic small loop transmission coils and calculating a second loop inductance;calculating a second series capacitor value for the second capacitor of the second metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the second capacitor based upon predetermined distances set for between the coil antenna and the target device; andcombining the first and second metallic small loop transmission coils in parallel, and fine tune the first and second capacitors.17. The method according to claim 13, wherein the first ones of each pair of small loop transmission coils have the same size and shape, and the second ones of each pair of small loop transmission coils have the same size and shape, and the ones of the same small loop pair have a different size and different shape.18. A method of designing a charging device to wirelessly charge a target device, comprising:a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field;a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; andwherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna, the method comprising:determining inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency tf, the inductance Lloop and capacitance Ctotal by formulae (1) and (2) below: f = 1 2 ? ? π ? L loop ? C total ( 1 ) L = ( N 2 × A 2 ) / ( 30 ? ? A - 11 ? ? D ? ? 1 ) ? ? A = ( D ? ? 1 + N ? ( W + S ) ) / 2 ( 2 ) according to the following:determining a first set of D1, D2, W and S for the first one of each pair of metallic small loop transmission coils based upon a size of the coil antenna and a quantity of the pairs of metallic small loop transmission coils and calculate a first loop inductance based upon formula (2);calculating a first series capacitor value for the first capacitor of the first metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the first capacitor;determining a second set of D1, D2, W and S for the second one of each pair of metallic small loop transmission coils based upon a size of the first one of the pair of metallic small loop transmission coils and calculate a second loop inductance based upon formula (2);calculating a second series capacitor value for the second capacitor of the second metallic small loop transmission coil according to formula (1);building a simulation model to fine tune the second capacitor based upon predetermined distances set for between the coil antenna and the target device; andcombining the first and second metallic small loop transmission coils in parallel, and fine tune the first and second capacitors.
微信群二維碼
意見(jiàn)反饋