TWI501501B - A wireless power transfer system - Google Patents

Description

Wireless power transmission module

The present invention relates to a wireless power transmission module, and more particularly to a wireless power transmission module using a silicon-based magnetic conductive sheet. By further integrating the solar cell module, the wireless power transmission module can increase the transmission efficiency and stability of the overall wireless power transmission module, and greatly improve the convenience of life.

With the widespread use of electronic products, the sources, types, usage methods and needs of electric power are also changing day by day. The introduction of alternative energy sources and the convenience of power operation have become important targets for the development of research teams in various countries around the world. In the introduction of alternative energy sources, solar energy is clean energy everywhere. It does not need to be transported, it will not cause pollution, and it will not deplete natural resources or cause global greenhouse effect. Therefore, the development of solar energy applications (such as solar cells) is The first choice for alternative energy import strategies.

In terms of the convenience of power operation, the wireless transmission of wired power transmission mode as a safe and convenient power transmission model has been favored by the consumer market in the past, which not only greatly enhances the convenience of life, but also uses cable more than the traditional one. The plug-in method is much safer. For example, the use of radio equipment in a damp environment such as a kitchen or bathroom can eliminate leakage problems. However, in the early days, the transmission distance was too short, the transmission process may cause electromagnetic wave radiation release and transmission efficiency to be low, and the market penetration rate was low. Until 2006 11 From the beginning of the MIT research team in the United States to develop a research project codenamed WiTricity (Wireless Electricity), trying to develop a technology that can transmit power wirelessly between long-distance systems (a few meters), that is, non-radiative magnetic Coupling resonance technique. Recently, the team has completed the project and publicized its research results. It pointed out that it is now possible to achieve a 60-watt bulb that is two meters away by wireless transmission. The transmission efficiency is increased to 40%, and the wireless is re-opened. This door for power transmission.

However, there are still many bottlenecks still to be solved, including the following: 1. As of today, the module of wireless power transmission still needs a power cord to supply module power to enable the module to start normally, so it still cannot Eliminating the concept of fully wireless power generation and transmission, and the current source of power is still not an alternative energy source, so how to integrate with alternative energy is an important issue; 2. In the technology of wireless power transmission, the principle is to use AC electromagnetic field It is converted into electric current to transmit electric power, but when the alternating electromagnetic field hits the metal casing, an electronic eddy current is generated, and the skin effect is generated to generate thermal energy on the metal, which not only causes energy loss to lower the charging efficiency, but also causes the product. The case of overheating or even burning; 3. The resonant coupling mechanism mainly relies on adjusting the resonant frequency of the tag at the transmitting and receiving ends or moving the position of both (transmitting and receiving) to each other. In addition, its relatively low efficiency is due to the interaction of complex environments with objects, resulting in increased energy losses.

In the past, it was mentioned that the resonant frequency of the tag device is not easy to match, and there is a frequency drift even when integrated into a metal medium. Not long ago, Wang et al., Appl. Phys. Lett. 98, (2011) 254101. published and suggested the use of anisotropic metamaterials between the transmitting end and the receiving end, which can help the wireless charging system. Energy transfer, which in turn increases efficiency. Most researchers focus on the addition of metamaterials with different structural designs in a limited space. The coupling between the two resonant resonators is good, thereby effectively improving and enhancing the transmission efficiency from the transmitting end to the receiving end. However, in the case of small portable electronic products, especially limited space and environmental interference factors, the harsh structural design of metamaterials often limits the development of its applications.

On the other hand, Cortes et al. stated that the resonant response of wireless power transmission depends on the nature of metamaterials, but subsequent studies are rarely mentioned and emphasized. So far, few experimental studies have validated this simulation, so it is important to find the ideal material.

In view of the above problems, the present invention provides a wireless power transmission module that can simultaneously solve the above problems.

The main object of the present invention is to provide a wireless power transmission module, which can increase the transmission efficiency and stability of the overall wireless power transmission module by the arrangement of the iron-based magnetic conductive sheet. In addition, by integrating solar cell modules, the overall wireless power transmission module can increase transmission efficiency and stability, and can greatly improve the convenience of life.

In order to achieve the above-mentioned main purpose, the present invention provides a wireless power transmission module, which mainly comprises: a transmitting end substrate; a receiving end substrate containing a solar cell; and an iron-based magnetic conductive sheet. Wherein, the transmitting end substrate is provided with a coil receiver having a plurality of first power input ports for generating a magnetic resonance energy; and the receiving end substrate including the solar battery module is further Providing the coil receiver, wherein the magnetic resonance energy from the coil receiver is received by a coil to generate an electric energy, or directly input into the electric energy through a plurality of second input ports of the solar battery module, Further charging the electronic product; and the iron-based magnetic conductive sheet further increases the magnetic resonance energy from the coil receptacle, which has a spacing relative to the emitting end substrate; wherein the material of the iron-based sheet The composition is FexSiyNbz, and x=80, y=15~17, and z=3~5.

In summary, the wireless power transmission module of the present invention has the following effects: 1. Since the prepared iron-based magnetic conductive sheet has a crystal grain size of a suitable nanocrystal structure, when applied to a wireless power transmission system, It can increase the overall transmission efficiency and stability; 2. It can be widely used in electronic products containing batteries or daily electrical appliances that require external independent power supply, completely eliminating the problems of socket and wire winding, and greatly improving the convenience of life; In the future, the increase in the size of its modules can be extended to wireless electric vehicles or traffic vehicles, thereby increasing convenience and increasing the visibility of Taiwan's next-generation electric vehicle market in the world; 4. ensuring that electronic products are wet. In the environment, it avoids the leakage problem, and has the functions of green energy and environmental protection; and 5. It can be applied to general household electrical appliances to achieve the innovative life concept of intelligent, beautiful and green.

〔this invention〕

100‧‧‧Wireless Power Transmission Module

110‧‧‧transmitting substrate

115‧‧‧ receiving end substrate

120‧‧‧Iron-based magnetic conductive sheet

130‧‧‧Cable Receiver

140‧‧‧ coil

150‧‧‧Power output connection埠

155‧‧‧Second power input port埠

160‧‧‧First power input port埠

170‧‧‧Solar battery module

Flow chart of preparation method of 200‧‧‧ iron-based magnetic conductive sheet

300‧‧‧Wireless Power Transmission Module

Figure 1 shows a first embodiment of a wireless power transfer module of the present invention.

2 is a flow chart showing a method of preparing a ferro-based magnetic conductive sheet in the wireless power transmission module of the present invention.

Figure 3 shows a second embodiment of a wireless power transfer module.

Fig. 4 is a view showing an analysis of the output voltage of the wireless power transmission module of the first embodiment under different illumination levels.

While the invention may be embodied in various forms, the embodiments illustrated in the drawings It is not intended to limit the invention to the particular embodiments illustrated and/or described.

Referring now to Figure 1, a first embodiment of a wireless power transfer module 100 of the present invention is shown. The wireless power transmission module mainly comprises: a transmitting end substrate 110; and an iron-based magnetic conductive sheet 120. The transmitting end substrate 110 is provided with a coil receiver 130 having a plurality of first power input ports 160 for generating a magnetic resonance energy.

The magnetic resonance energy can be obtained by connecting from a general commercial power source, a secondary battery or a solar battery. The coil receiver 130 can be composed of a conventional copper enamel coil to obtain a certain amount of inductance. With a certain amount of capacitors, a specific range of resonance frequencies can be used. The coil receiver is used in a frequency range of between 100 kHz and 500 kHz. More preferably, the coil receiver is used in a frequency range between 100 kHz and 250 kHz.

Table 1 is a transmission efficiency table of the output voltage, output current, output power and wireless charging transmission module 100 of the wireless power transmission module 100 incorporating the polycrystalline germanium solar cell of the present invention. It can be seen from Table 1 that the transmission efficiency of the wireless power transmission module 100 of the present invention can be maintained at more than 30% between the transmission distances of 7 mm and 9.5 mm, and the high-performance charging capability is displayed.

The iron-based magnetic conductive sheet 120 may also have a spacing with respect to the substrate 110. The coil-shaped magnetic conductive sheet 120 is provided with a coil 140, and the coil 140 can receive the magnetic wave from the coil receiver 130. The resonance energy is used to generate an electric energy, or the electric energy is directly input by the plurality of second electric power input ports 155 of the solar cell module, thereby charging the electronic product. The coil 140 is composed of a conventional copper enamel coil winding, and a certain amount of inductance has been obtained. Wherein the spacing is between 0.1 cm and 5 cm, preferably the spacing is between 0.5 cm and 1 cm.

The iron-based magnetic conductive sheet 120 is used to improve the magnetic coupling transmission efficiency of the wireless power transmission module. The material composition of the stellite-based sheet 120 is FexSiyNbz, and x=80, y=15-17, and z=3~5. In addition, the soft iron-based sheet 120 can be used to enhance the inductance and magnetic coupling characteristics of the coil 140, thereby enabling the present invention to improve the stability of the induced current.

Referring to FIG. 2, it is a flow chart 200 of a method for preparing a ferro-based magnetic conductive sheet according to the present invention, the steps of which mainly include: Step 210: providing an iron-based sheet, wherein the material composition of the iron-based sheet is Is FexSiyNbz, and x=80, y=15~17, z=3~5; Step 220: cutting the iron-based base sheet to make the iron-based base sheet a specific topography; Step 230: cleaning with an organic solvent The iron-based sheet after cutting has been processed. In one embodiment, the cleaning treatment is performed by ultrasonic vibration washing with absolute ethanol for about 10 minutes; step 240: drying the cleaned iron-based sheet at 60-80 ° C; step 250: vacuum annealing treatment has been baked The iron-based sheet is dried to form a magnetically permeable material having a nanocrystalline structure (the magnetically permeable material referred to herein is the iron-based magnetic conductive sheet 120 of the present invention).

In step 210, the iron-based sheet can be produced by impact chilling, melt spinning, chilling melt spinning, high pressure casting, etc., preferably by single-roller melt spinning. Prepared by the Single roller melt spinning method. Wherein, the step 210 of the iron-based sheet further comprises the following steps: A: the raw material (the material composition is FexSiyNbz, and x=80, y=15~17, z=3~5) is first performed in the induction furnace. Melting; B: converting the molten material (FexSiyNbz, and x=80, y=15~17, z=3~5) to the feeding zone; C: using a casting head as the process control; D: melting the thinned sheet The material (the material composition is FexSiyNbz, and x=80, y=15~17, z=3~5) is quickly sprayed onto the cooling wheel; E: the spray material is cooled at a rate of 10 ⁶ ° C per second to form the iron raft base. Sheet, it should be noted that the iron-based sheet is amorphous at this time; F: measuring the width and thickness of the sheet-based sheet and feeding back to the process control of step C; G: guiding to the feed unit; : 8 steps such as receiving materials.

In step 220, the particular topography is one of a cube, a cuboid, and a polygon, and the thickness is between 10 μm and 50 μm. Preferably, the thickness of the particular topography is between 20 μm and 40 μm. In a specific embodiment, the specific topography of the iron-based sheet has a length and width of 4 cm and a thickness of 25 μm. It should be noted that, in step 250, in order to develop a nanostructure in the iron-based magnetic conductive sheet 120 of the present invention, the present invention refers to a nano quantum dot self-aggregation technique, mainly by placing the iron-based sheet sample. The high temperature furnace is subjected to annealing heat treatment in a vacuum environment. Wherein, the vacuum annealing heat treatment has a vacuum degree of less than 1×10 ⁻² Torr, the vacuum annealing heat treatment temperature is between 400° C. and 800° C., and the temperature holding time is between 20 minutes and 120 minutes. In the vacuum annealing heat treatment, a higher vacuum degree can prevent oxidation of the metal alloy material. Therefore, preferably, the vacuum annealing heat treatment has a vacuum degree of less than 5×10 ⁻³ Torr; the vacuum annealing heat treatment temperature is between 450° C. and 600° C., and the temperature holding time is between 20 minutes and 60 minutes. Between minutes. In a preferred embodiment, the high temperature furnace has a vacuum of 1×10 ⁻³ Torr, an annealing temperature of 500° C., a heating rate of 8.33° C./min, a holding time of 30 minutes, and a segregation through a vacuum reduction concept. The iron-based magnetic conductive sheet 120 of a supersaturated nanocrystalline structure. Wherein the nanocrystalline Fe ₃ Si crystal grains, and the crystal surface of the nanocrystalline structure is a (220) plane, a crystal grain size is between 5 nm and 20 nm, and the nanocrystalline structure is in the iron crucible The volume density of the base magnetic conductive sheet 120 is between 8.0 × 10 ¹⁵ cm ^-3 and 9.9 × 10 ¹⁷ cm ^-3 .

In one embodiment, in the near field distance (Distance, cm) (x=0) measurement, Fe ₈₀ Si ₁₇ Nb _{3 is} used as the material of the iron-based magnetic conductive sheet 120, and the wireless power transmission module 100 shows that the transmission efficiency of 59% is much larger than that of Fe ₈₀ Si ₁₆ Nb ₄ and Fe ₈₀ Si ₁₅ Nb ₅ as the material of the iron-based magnetic conductive sheet 120, the transmission efficiency of the wireless power transmission module 100.

Transmission efficiency is defined as the ratio of the wattage of the electrical energy generated by the receiving coil to the wattage energy of the magnetic resonance input by the transmitting coil receiver.

This result indicates that the high saturation magnetic flux density derived from the low erbium doping amount and the low coercive force contribute to the improvement of the transmission distance and efficiency of the wireless power transmission module 100. In addition, Table 2 shows that when the iron-based magnetic conductive sheet 120 is not added, the transmission efficiency of the wireless power transmission module 100 is 34% at the near-field distance, and the maximum distance of the conductive power is 4.8 mm, which is obvious. It can be seen that after the conductive iron-based magnetic conductive sheet 120 is added as the carrier substrate of the coil, the wireless power transmission module 100 can effectively improve the efficiency and the distance.

In one embodiment, the present invention actually applies the wireless power transmission module 100 described above to a 3G mobile phone, and when the power terminal of the 3G mobile phone is introduced into the developed charging module and placed in a power (6.7V and 150 mA) transmission. When the function is on the mouse pad, the 3G mobile phone displays the charging mode, which completely eliminates the process of power supply alignment when the current 3G mobile phone is charged, and improves the convenience.

Referring now to FIG. 3, it is a second embodiment of the wireless power transmission module 300 of the present invention. The power output port 150, the second power input port 155, the receiving end substrate 115, the iron-based magnetic conductive sheet 120, and the coil 140 of the upper portion of FIG. 3 and FIG. 1 are not greatly different. The main difference is that the second power input port 155 of the wireless power transmission module further includes a solar battery module 170, and the coil receiver directly supplies the coil receiver load power. The solar cell module 170 can be equipped with a flexible solar cell, which is designed to make the wireless power transmission receiving end application more flexible while reducing space loss or waste. In addition, the solar cell module 170 may further comprise a chargeable and dischargeable battery, and may be one of a germanium, a block of a tri-five compound or a film type thereof.

Referring now to FIG. 4, it is an analysis diagram of the output voltage of the wireless power transmission module 300 of the first embodiment under different illumination levels. It should be noted that, in this embodiment, the solar cell module 170 is a polycrystalline silicon solar cell. It can be seen from the analysis that the output voltage of the wireless power transmission module 300 will also increase as the illumination increases.

In summary, a significant feature of the present invention is that the wireless power transmission module of the present invention can activate the solar battery module 170 under illumination of light, further eliminating any external power. The source of the wireless power transmission module of the present invention supplies power to other electronic products. The wireless power transmission module can still connect to the transmitting end, that is, the coil receiver 130, through the commercial power or the secondary battery to perform wireless power transmission under the condition that there is no light irradiation or insufficient illumination. Moreover, the receiving end, that is, the coil 140, in addition to receiving power from the transmitting end (the coil receiver 130 end), can also be directly charged by the solar battery module 170 on the receiving end. Therefore, the wireless power transmission module of the present invention can vertically integrate the wireless power transmission technology of the solar battery and the non-radiation magnetic coupling resonance, completely eliminating the need for wires and sockets that must be used in future smart electronic products, and enabling the solar battery to be used. The generated electricity is directly transmitted to the wireless power. This non-radiative magnetic coupling resonance technology transmits the amount of solar energy to a specific spatial position, and has a safe space, aesthetics and convenience of non-radiative energy transfer.

In summary, the wireless power transmission module of the present invention has the following effects: 1. Since the prepared iron-based magnetic conductive sheet has a crystal grain size of a suitable nanocrystal structure, when applied to a wireless power transmission system, It can increase the overall transmission efficiency and stability; 2. It can be widely used in electronic products containing batteries or daily electrical appliances that require external independent power supply, completely eliminating the problems of socket and wire winding, and greatly improving the convenience of life; In the future, the increase in the size of its modules can be extended to wireless electric vehicles or traffic vehicles, thereby increasing convenience and increasing the visibility of Taiwan's next-generation electric vehicle market in the world; 4. ensuring that electronic products are wet. In the environment, it avoids the leakage problem, and has the functions of green energy and environmental protection; and 5. It can be applied to general household appliances to achieve the wisdom, beauty and environmental protection. New city life concept.

While the present invention has been described in its preferred embodiments, it is not intended to limit the scope of the invention, and various modifications and changes can be made without departing from the spirit and scope of the invention. As explained above, various modifications and variations can be made without departing from the spirit of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

300‧‧‧Wireless Power Transmission Module

115‧‧‧ receiving end substrate

120‧‧‧Iron-based magnetic conductive sheet

140‧‧‧ coil

150‧‧‧Power output connection埠

155‧‧‧Second power input port埠

170‧‧‧Solar battery module

Claims (8)

A wireless power transmission module mainly includes: a transmitting end substrate on which a coil receiver is disposed, the coil receiver having a plurality of first power input ports for generating a magnetic resonance energy; The receiving end substrate of the battery module is further provided with the coil receiver, wherein the magnetic resonance energy from the coil receiver is received by a coil to generate an electric energy, or by the solar battery module a plurality of second input connections directly inputting the electrical energy to charge the electronic product; and an iron-based magnetic conductive sheet that further enhances the magnetic resonance energy from the coil receptacle relative to the transmitting end The substrate has a spacing arrangement; wherein the material composition of the iron-based magnetic conductive sheet is FexSiyNbz, and x=80, y=15~17, and z=3~5. The wireless power transmission module of claim 1, wherein the solar battery module is one of a block of twin, a tri-five compound or a film type thereof. The wireless power transmission module of claim 1, wherein the coil receiver is used in a frequency range of between 100 kHz and 500 kHz. The wireless power transmission module of claim 1, wherein the iron-based magnetic conductive sheet is flexible. The wireless power transmission module according to claim 1, wherein the material composition of the iron-based magnetic conductive sheet is a magnetic conductive material having a (220) plane Fe ₃ Si nanocrystal structure. The wireless power transmission module of claim 5, wherein the magnetic material of the (220) plane Fe ₃ Si nanocrystal structure has a grain size of between 5 nm and 20 nm. The wireless power transmission module according to claim 5, wherein the Fe ₃ Si nanocrystal structure of the magnetic conductive material having a (220) plane Fe ₃ Si nanocrystal structure is in the magnetic conductive material The bulk density is between 8.0 x 10 ¹⁵ cm ^-3 and 9.9 x 10 ¹⁷ cm ^-3 . The wireless power transmission module of claim 1, wherein the spacing is between 0.1 cm and 2 cm.