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WO2015035860A1 - Appareil de transmission de puissance de type à pénétration basse fréquence - Google Patents

Appareil de transmission de puissance de type à pénétration basse fréquence Download PDF

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Publication number
WO2015035860A1
WO2015035860A1 PCT/CN2014/085493 CN2014085493W WO2015035860A1 WO 2015035860 A1 WO2015035860 A1 WO 2015035860A1 CN 2014085493 W CN2014085493 W CN 2014085493W WO 2015035860 A1 WO2015035860 A1 WO 2015035860A1
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WIPO (PCT)
Prior art keywords
power transmission
magnetic
metal
core
receiver
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Ceased
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PCT/CN2014/085493
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English (en)
Chinese (zh)
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曾超宁
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Individual
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Individual
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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
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

Definitions

  • the present invention relates to wireless power transmission, and more particularly to a low frequency transmissive power transmission device capable of wirelessly transmitting power through a metal medium.
  • Wireless inductive transmission of electricity is one of the popular application technologies today, such as wireless inductive charging of mobile phones.
  • the working principle is: the power transmitting coil disposed in the inductive charging base is aligned with the power receiving coil in the back cover of the mobile phone, and the power receiving coil obtains the alternating magnetic field energy transmitted by the power transmitting coil through electromagnetic induction, and the received alternating current is received.
  • the power is converted to DC power to wirelessly charge the battery of the mobile phone or other electronic device.
  • the charging process is very safe, there are no many drawbacks caused by electrical contact, and it is easy to operate. It can be charged by placing the mobile phone on the charging stand. These advantages make the user happy to use.
  • the size and shape of the power transmitting coil and the power receiving coil are specified, and a relatively large area of the flat-shaped coil is used.
  • the area of the A1 type coil for transmitting electric power is 1500 mm 2
  • the frequency of the alternating magnetic field for transmitting electric power is also set to be between 110 kHz and 205 kHz.
  • the insulating material between the power transmitting coil and the power receiving coil such as the inductive charging stand panel and the back cover of the mobile phone, cannot use a conductive metal or metal alloy material.
  • a type of transmission eddy current detection sensor uses a lower frequency alternating magnetic field to penetrate a metal material.
  • the material is used to detect sheet metal thickness and surface defects on the production line. According to the specifications of the relevant product manufacturers, some of the metals tested can reach a thickness of 100mm.
  • the working principle is that the excitation coil and the signal receiving coil are respectively disposed on two sides of the detected metal plate; when the low frequency (audio) voltage is applied to both ends of the excitation coil, the excitation coil generates an alternating magnetic field and is in the metal plate.
  • An eddy current is generated which depletes part of the magnetic field energy such that the magnetic lines of force passing through the signal receiving coil are reduced, thereby reducing the induced potential generated by the signal receiving coil.
  • the greater the thickness of the metal sheet the larger the magnetic field energy of the eddy current loss, and the smaller the induced potential.
  • the magnitude of the induced potential of the signal receiving coil indirectly reflects the thickness of the metal sheet (Note: the magnitude of the eddy current generated in the metal sheet is also related to the resistivity of the metal sheet).
  • the penetration depth of the eddy current in the metal plate is represented by the following functional formula:
  • the functional formula shows that in the case of the selected metal material (ie, the resistivity ⁇ and the relative magnetic permeability ⁇ r are fixed parameter values), the eddy current penetration depth h will significantly change as the alternating magnetic field frequency f increases. small.
  • the transmissive eddy current detecting sensor can transmit the alternating magnetic field signal through the metal plate, it is designed to collect weak detection signals, and the structural configuration of the excitation coil and the signal receiving coil (such as the size and shape of the coil and the placement method).
  • the circuit configuration (such as only for amplifying and processing the detection signal) is not suitable for transmitting drive power that has the function of charging the mobile phone battery and driving the predetermined electronic device.
  • the present invention aims to provide a power transmission device capable of wirelessly inductively transmitting the driving power through a predetermined metal medium layer, so as to solve the problem that the wireless inductive charging product of the Qi standard cannot charge the metal back case mobile phone.
  • the problem is to overcome the shortcomings of the existing low-frequency transmission eddy current detection technology that cannot be used for power transmission.
  • a suitable excitation alternating magnetic field frequency to increase the ability of the alternating magnetic field energy to pass through the metallic material. For example, selecting an alternating magnetic field frequency with a preselected sheet metal that penetrates a thickness of 50 mm or more (eg 2000 Hz), when the alternating magnetic field energy penetrates the metal back shell of a mobile phone, which is usually only 0.5 mm thick, most of the magnetic field energy can be transmitted to the power receiving coil.
  • the power transmitting coil and the power receiving coil are in close contact with the penetrated metal medium layer, which can reduce the air reluctance formed by the air gap, and can effectively reduce the eddy current of the power transmitting coil projected on the metal medium layer. area.
  • the power is transmitted in a resonant manner, and the power receiving coil and the energy storage capacitor form a resonant circuit, and resonate with the alternating magnetic field frequency output by the power transmitting coil to improve the transmission efficiency of the alternating magnetic field energy.
  • a first aspect of the present invention provides a low frequency transmissive power transmission apparatus including: a transmitter configured to convert DC power into AC magnetic energy of a predetermined frequency and output to the outside via a predetermined transmission port; An isolator consisting of a preselected metal or metal alloy material and shaped into a predetermined shape; a receiver configured to be isolated from the isolator by a predetermined receiving port in use The transmitting port is docked, and the alternating magnetic energy is received in a magnetic field coupling and electromagnetic resonance mode, and then the alternating magnetic energy is converted into direct current electrical energy.
  • the power transmission device of the present invention can realize wireless power transmission by setting a suitable AC magnetic field frequency and selecting a metal or metal alloy material which is advantageous for reducing eddy current loss, and further improving power transmission efficiency in combination with electromagnetic resonance.
  • a second aspect of the invention is the power transmission device of the above aspect, further comprising a communicator configured to perform data communication between the transmitter and the receiver.
  • the power transmission device of the present invention can simultaneously implement data communication to meet the intelligent control needs in the power transmission process.
  • a third aspect of the invention is the power transmission device according to the first aspect, wherein the predetermined frequency is any one of 20 kHz or less.
  • the power transmission device of the present invention can select a suitable one according to the properties of the penetrated metal medium (such as the resistivity of the metal material, the relative magnetic permeability and the material thickness), and the power transmission power.
  • AC magnetic field frequency such as the resistivity of the metal material, the relative magnetic permeability and the material thickness
  • a fourth aspect of the invention is the power transmission device according to the first aspect and the second aspect, wherein the transmitting port includes at least one magnetic energy transmitting magnetic core, wherein the magnetic energy transmits both ends of the magnetic core The end of the magnetic circuit is embedded in the transmitting port.
  • the transmitter in the power transmission device of the present invention can output the AC magnetic energy to the outside with a high magnetic flux density, and thus reduce the eddy current forming area on the metal isolator.
  • a fifth aspect of the invention is the power transmission device of the first aspect, wherein the receiving port comprises at least one magnetic energy receiving core, wherein the magnetic energy receives both ends of the magnetic core The end of the magnetic circuit is embedded in the receiving port.
  • the receiver in the power transmission device of the present invention can receive the AC magnetic energy transmitted by the transmitter in a high magnetic flux density, and thus reduce the eddy current forming area on the metal isolator.
  • a sixth aspect of the invention is the power transmission device according to the fourth aspect or the fifth aspect, wherein the isolator is spaced apart from a wall thickness of the transmitting port and the receiving port portion, less than The distance between the magnetic energy transmitting core and the end of the magnetic circuit at both ends of the magnetic energy receiving core.
  • the power transmission device of the present invention can ensure that more AC magnetic energy is smoothly transmitted through the metal isolator and reduce the self-coupling leakage loss between the magnetic circuit ends of the magnetic energy transmitting core.
  • a seventh aspect of the invention is the power transmission device according to the first aspect and the second aspect, wherein the isolator is physically combined with the transmitter or/and the receiver as Integrated and constituting at least one of the conveyor or/and the integral housing or part of the housing of the receiver.
  • the power transmission device of the present invention can perform various combinations of the isolator and the transmitter or/and the receiver according to the needs of the application.
  • wireless inductive charging can be realized for various high-end mobile phones using a metal material as a back cover of a mobile phone.
  • FIG. 1 is a schematic diagram showing the operation principle of implementing wireless inductive charging through a metal medium as an embodiment of the present invention.
  • the low frequency transmission type power transmission device 100 of the embodiment shown in FIG. 1 is composed of a transmitter 10, a receiver 20 and an isolator 30, respectively; wherein the transmitter 10 includes a first magnetic core 11 as shown in the figure a coil 12, a first capacitor 13, a converter 14, a first communicator 15, and a DC power source 16; wherein the receiver 20 includes a second core 21, a second coil 22, a second capacitor 23, and a rectifier as shown 24.
  • the outer casing component of the device 20 is constructed of austenitic 304 stainless steel and is designed in the form of a thin wall structure which may be either a housing component of the conveyor 10 or a receiving unit.
  • the inverter 14 converts the DC power source 16 (i.e., DC power supplied from an internal battery (not shown) or an external power adapter) into AC power having a frequency lower than a predetermined frequency (e.g., 3 kHz) within 20 kHz, and It is coupled to the first coil 12 via a first capacitor 13, wherein the first coil 12 and the first capacitor 13 form a series resonant circuit that co-resonates at a frequency of 3 KHz.
  • a predetermined frequency e.g., 3 kHz
  • an alternating magnetic field of 3 KHz frequency is generated in the first magnetic core 11, wherein the first magnetic core 11 is composed of a magnetic core of high magnetic induction strength and high magnetic permeability (such as a silicon steel core, a glassy magnetic A magnetic core having a high magnetic permeability characteristic of any one of a core, an amorphous magnetic core, an ultrafine crystal core, and a ferrite core, and a core structure having a small cross-sectional area.
  • a magnetic core of high magnetic induction strength and high magnetic permeability such as a silicon steel core, a glassy magnetic
  • the first port 11a and the second port 11b in the first core 11 can output AC magnetic energy of a high magnetic flux density outward, and have a deep metal penetration capability due to an AC magnetic field frequency of 3 KHz, and the isolator 30 Consisting of 304 stainless steel having a higher electrical resistivity and a low magnetic permeability, the reverse magnetic flux generated by the eddy current on the isolator 30 will be much smaller than the magnetic flux output from the first magnetic core 11.
  • the first port 11a and the second port 11b in the conveyor 10 are in close contact with the isolator 30 to reduce the air reluctance caused by the air gap, while the second core 21 in the receiver 20
  • the third port 21a and the fourth port 21b are also in close contact with the other side of the isolator 30, and respectively constitute a magnetically coupled docking state with the first port 11a and the second port 11b in the conveyor 10, that is, by the first magnetic core 11 Together with the second core 21, a closed magnetic circuit is formed which is spaced apart from the isolation 30.
  • the distance between the third port 21a and the fourth port 21b is much larger than the interval between the isolator 30 and the first port 11a.
  • the wall thickness d2 between the third port 21a and the low magnetic permeability characteristic of the isolator 30, the self-coupling leakage between the first port 11a and the second port 11b is small, so that most of the magnetic flux can be smoothly Coupled into the second core 21 .
  • the rectifier 24 is capable of receiving more AC power and converting it to DC power to charge the battery 27.
  • the present embodiment exemplifies charging the DC power output from the receiver 20 to the battery 27 as an example.
  • the DC power output from the receiver 20 can also be used to provide power support to other electronic circuits or electronic devices not shown.
  • the data signal output by the first communicator 15 can modulate the AC power generated by the converter 14 and transmit the modulated AC magnetic energy coupling to the receiver 20 via the first core 11 , and then Data demodulation is performed by the second communicator 25 in the receiver 20.
  • the receiver 20 is also capable of transmitting the communication data in the reverse direction to the transmitter 10, that is, the second communicator 25 controls the addition/unloading of the communication resistor 26 under the support of the power output from the transmitter 10 in advance.
  • the principle is that the second communicator 25 controls the addition/unloading variation of the communication resistor 26 exhibiting a large load characteristic according to a predetermined communication protocol, so that the output power of the transmitter 10 fluctuates synchronously. In this way, the first communicator 15 can generate corresponding demodulated data according to the fluctuation of the output power of the transmitter 10, and implement reverse communication of data in a load feedback manner.
  • modulation communication and the load feedback communication of the alternating current power are exemplified in the present embodiment.
  • other data communication modes can be selected according to the needs of the application.
  • a Hall sensor (not shown) is placed at a predetermined position in the receiver 20, and a communication coil (not shown) is placed at a predetermined position in the conveyor 10, and data communication information is applied to a communication coil (not shown).
  • the voltage signal, a Hall sensor (not shown) can inductively receive an electromagnetic signal transmitted from a communication coil (not shown) through the isolator 30 to realize electromagnetic induction communication.
  • other data communication modes such as infrared communication, radio frequency communication, and near field communication may be selected according to the needs of the application.
  • the present embodiment exemplifies the manner in which the first coil 12 and the first capacitor 13 in the transmitter 10 resonate in series.
  • a resonant circuit connection method in which the first coil 12 and the first capacitor 13 are connected in parallel may be selected.
  • the second coil 22 and the second capacitor 23 in the receiver 20 are exemplified in parallel resonance, and in addition, the second coil 22 and the second capacitor 23 may be used.
  • a storage capacitor (not shown) is connected in series to form a series-parallel resonance.
  • first magnetic core 11 and the second magnetic core 21 having a U-shaped structure are coupled to each other as an example in the present embodiment. In addition to this, it is also possible to adopt a manner in which magnetic cores of any other structural shape are coupled to each other. Further, although the present embodiment exemplifies that the single first core 11 and the single second core 21 are mutually Coupling is an example. In addition, a plurality of magnetic cores (ie, magnetic core arrays) may be coupled to each other.
  • the separator 30 in this embodiment is exemplified by an austenitic 304 stainless steel alloy material.
  • other low magnetic permeability metals such as copper, aluminum
  • low magnetic permeability metal alloys such as titanium alloys containing no iron or nickel
  • the isolator 30 can also be made of a material having a higher magnetic permeability (such as iron, nickel, and alloys thereof), and its use condition must satisfy that the magnetic flux output to the first core 11 is less.
  • the wall thickness of the isolator 30 separated from the portion between the first core 11 and the second core 21 can be made thinner, thereby reducing the magnetic path short-circuit loss of the magnetic flux outputted to the first core 11 .
  • the isolator 30 can be integrated with the transmitter 10 or/and the receiver 20, that is, the isolator 30 can be transmitted.
  • the outer casing component or part of the outer casing component of the device 10 can also serve as a housing component or a partial outer casing component of the receiver 20.
  • the present embodiment exemplifies a tightly coupled power transmission mode in which the first magnetic core 11 and the second magnetic core 21 are in close contact with the isolator 30, in addition to this, the first magnetic core 11 or / may be made as needed. And a power transmission mode in which the second core 21 and the isolator 30 retain a small amount of air gap. This will facilitate the application of the transmitter 10 and the receiver 20 in the process of transmitting power, in which there is a relative motion relationship between the two.
  • the low frequency transmission type power transmission device of the invention can not only solve the wireless charging problem of the high-grade metal back shell mobile phone.
  • the present invention can be widely applied to various applications that require wireless transmission of required driving power and data through a metal device or a metal member.
  • the receiver 20 is placed in a metal sealed container (not shown), and an electronic device including various industrial sensors is provided in the metal sealed container, and the transmitter 10 can provide wireless power support to an electronic device (not shown). And reading the detection data of the relevant sensor (such as the internal pressure of the metal container, the temperature, and the pH value in the liquid, etc.); for example, the receiver 20 is placed in a passive electronic lock composed of a metal casing (not shown).
  • the transmitter 10 can wirelessly transmit the required power and unlock the password through the all-metal lock body to realize the unlock control. Therefore, the outer structure of the transmitter 10 can be either a fixed structure (such as a mobile phone wireless charging adapter) or a handheld structure (such as a portable unlocking device).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention porte sur un appareil de transmission de puissance de type à pénétration basse fréquence qui est apte à pénétrer à travers un support métallique pour transmettre de manière sans fil une puissance électrique. L'appareil comprend un émetteur (10), un séparateur (30) et un récepteur (20). L'émetteur (10) est configuré pour convertir une énergie électrique à courant continu en une énergie magnétique à courant alternatif à l'aide d'une fréquence préréglée, et délivrer cette dernière à l'extérieur à travers un port préréglé. Le séparateur (30) est en métal ou en alliage de métal préréglé, et est réglé en une forme préréglée. Le récepteur (20) est configuré pour être séparé dans le séparateur (30) par un port de réception préréglé et est connecté au port de réception lorsque le récepteur (20) est dans un état d'utilisation, recevoir l'énergie magnétique à courant alternatif d'une manière à couplage de champ magnétique ou à résonance électromagnétique, et ensuite convertir l'énergie magnétique à courant alternatif en énergie électrique à courant continu. L'appareil de transmission de puissance de type à pénétration basse fréquence peut satisfaire des exigences pour une charge sans fil d'un téléphone mobile avec un boîtier arrière métallique, et peut également être largement utilisé dans d'autres projets d'application dans lesquels la puissance électrique de pilotage a besoin d'être transmise d'une manière de détection sans fil par pénétration à travers un appareil métallique ou une partie métallique.
PCT/CN2014/085493 2013-09-11 2014-08-29 Appareil de transmission de puissance de type à pénétration basse fréquence Ceased WO2015035860A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310410941.8 2013-09-11
CN2013104109418A CN103427503A (zh) 2013-09-11 2013-09-11 低频透射式电力传输装置

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WO2015035860A1 true WO2015035860A1 (fr) 2015-03-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020088954A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique
WO2020089012A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique
WO2020088953A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103427503A (zh) * 2013-09-11 2013-12-04 曾超宁 低频透射式电力传输装置
CN113490589A (zh) * 2019-02-28 2021-10-08 富士胶片株式会社 供电部件、线圈配置用磁性片及线圈配置用磁性片的制造方法
CN111541309A (zh) * 2019-08-26 2020-08-14 上海交通大学 用于胃肠道微型机器人的无线能量发射装置
CN113517766B (zh) * 2021-05-19 2024-05-14 广东工业大学 一种动态调整的无线充电装置及其控制方法

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CN102691445A (zh) * 2012-06-14 2012-09-26 曾超宁 由钥匙向锁体接触耦合供电的电子锁具
EP2541564A1 (fr) * 2011-06-29 2013-01-02 Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO Transfert d'énergie sans fil
CN102998711A (zh) * 2011-09-09 2013-03-27 索尼公司 检出装置、电力接收装置和电力发送装置
CN103109591A (zh) * 2010-09-26 2013-05-15 捷通国际有限公司 选择性可控电磁屏蔽
CN103346623A (zh) * 2013-07-15 2013-10-09 曾超宁 低频透射式电力传输装置
CN103427503A (zh) * 2013-09-11 2013-12-04 曾超宁 低频透射式电力传输装置

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US20080200119A1 (en) * 2007-02-16 2008-08-21 Seiko Epson Corporation Power reception control device, power transmission control device, non-contact power transmission system, power reception device, power transmission device, and electronic instrument
CN103109591A (zh) * 2010-09-26 2013-05-15 捷通国际有限公司 选择性可控电磁屏蔽
EP2541564A1 (fr) * 2011-06-29 2013-01-02 Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO Transfert d'énergie sans fil
CN102998711A (zh) * 2011-09-09 2013-03-27 索尼公司 检出装置、电力接收装置和电力发送装置
CN102691445A (zh) * 2012-06-14 2012-09-26 曾超宁 由钥匙向锁体接触耦合供电的电子锁具
CN103346623A (zh) * 2013-07-15 2013-10-09 曾超宁 低频透射式电力传输装置
CN103427503A (zh) * 2013-09-11 2013-12-04 曾超宁 低频透射式电力传输装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020088954A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique
WO2020089012A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique
WO2020088953A1 (fr) * 2018-10-31 2020-05-07 Hilti Aktiengesellschaft Circuit résonnant pour la transmission d'énergie électrique

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