KR20130029004A - Wireless electromagnetic receiver and wireless power transfer system - Google Patents

Abstract

PURPOSE: A wireless electromagnetic field receiver and a wireless power transfer system are provided to supply power with low energy consumption without a wire. CONSTITUTION: A first device(310) reacts to an electromagnetic field. A second device converts mechanical energy into electric power. The first device is a solid-state mechanical resonator being made of a magnetostrictive material. The second device is a converter converting mechanical energy generated based on oscillation of the mechanical resonator into electrical power. The converter is not mechanically connected to the resonator.

Description

WIRELESS ELECTROMAGNETIC RECEIVER AND WIRELESS POWER TRANSFER SYSTEM}

The following embodiments relate to wireless technology, and in particular, to systems and apparatus for transmitting power without cables.

Electromagnetic wireless power transfer systems can be classified into radiative and non-radiative systems. Radial power transfer systems are based on narrow-beam transmitters and utilize electromagnetic radiation in the far-field. Non-radiative power transfer systems are based on electromagnetic induction and use non-radiative in the near-field.

Since resonance power transfer technology has been proposed, interest in non-radiative power transfer systems has increased. Most known resonator-based devices for transmitting wireless power are based on electromagnetic resonator structures.

Resonator structures used in resonant power transfer systems can also be used in non-resonance systems. For example, it can be used in radiative systems.

The drawback of the structure of the electromagnetic resonator is that the process of a small size sensitive electromagnetic resonator with a high quality factor (Q-factor, Q) is complicated. Another drawback is that the production of electromagnetic resonators with high Q-factors and low resonant frequencies is complex. In order to increase the efficiency of the power transfer process, it is desirable to make the Q factor as high as possible.

In one aspect, a wireless electromagnetic receiver converts a first device and mechanical energy into electrical power in response to an electromagnetic field, and contacts with the first device. And a second device, wherein the first device is an integral solid-state mechanical resonator made of magnetostrictive material, and the second device is configured to convert the mechanical energy generated based on the oscillation of the mechanical resonator. The transducer converts to power, and the inductive transducer may not be mechanically connected to the resonator.

The mechanical resonator may be operated by an external electromagnetic field at the resonant frequency of the resonator.

The transducer may maintain a quality factor of the mechanical resonator.

The mechanical resonator may be made of a magnetostriction material having a quality factor greater than 2000.

The mechanical resonator may be made of magnetostriction ferrite.

The mechanical resonator may have a shape selected in such a manner that the mechanical resonant mode is performed at a working frequency.

The mechanical resonator may be in the form of a cylinder.

The mechanical resonator may be in the form of a cross-section bar.

The mechanical resonator may be in the form of a plate.

The mechanical resonator may be biased and operated by a permanent magnet.

The permanent magnets can be made of magnetic ceramics.

The mechanical energy transducer may be a coil surrounding the resonator attention.

The coil end of the inductive transducer can be connected to a load.

In one aspect, a wireless electromagnetic receiver includes a source for generating a variable magnetic field and a wireless electromagnetic receiver for receiving energy from the source, wherein the wireless electromagnetic receiver Includes a first device responsive to an electromagnetic field and a second device that converts mechanical energy into electrical power and is coupled with the first device, the first device being made of a magnetostrictive material An solid solid-state mechanical resonator, the second device is a transducer for converting mechanical energy generated based on the oscillation of the mechanical resonator into the electrical power, and the inductive transducer is connected to the resonator. It may not be mechanically connected.

The mechanical resonator may be operated by an external electromagnetic field at the resonant frequency of the resonator.

The transducer may maintain a quality factor of the mechanical resonator.

The mechanical resonator may be made of a magnetostriction material having a quality factor greater than 2000.

The mechanical resonator may be made of magnetostriction ferrite.

The mechanical resonator may have a form selected in such a manner that the mechanical resonant mode is performed at a working frequency.

The mechanical resonator may be in the form of a cylinder.

The mechanical resonator may be in the form of a cross-section bar.

The mechanical resonator may be in the form of a plate.

The mechanical resonator may be biased and operated by a permanent magnet.

The permanent magnets can be made of magnetic ceramics.

The transducer may be performed by a coil surrounding the resonator.

Coils surrounding the inducer may be connected to a load.

The source is located at a distance closer to the wavelength length λ at a frequency f and has a non-radiating resonant structure, where λ = c / f and c may be the speed of light. .

The source is located at a distance closer to the wavelength length λ at frequency f and has a non-radiating non-resonant structure, where λ = c / f, and c is It can be the speed of light.

The source is located at a distance farther than the wavelength length λ at a frequency f and has a radiating structure, where λ = c / f and c may be the speed of light.

The main problem solved by the proposed invention is the development of a resonant based receiver with low frequency application, suitable for small size and high Q-factor in the proposed wireless power transmission system.

In order to solve the above problem, an improved design of a wireless electromagnetic receiver has been proposed, and the receiver is composed of a device that is sensitive to electromagnetic fields. And another apparatus can be performed by converting mechanical energy into electrical power; The receiver, characterized by the device being sensitive to electromagnetic fields, is characterized by an integral solid-state mechanical resonator made of magnetostrictive material. The second device is characterized by an inducible transducer (transformer) transformer which converts the mechanical energy of the resonator oscillation into electrical energy, wherein the transducer is not mechanically connected to the resonator.

Therefore, the proposed receiver can fulfill the functions of the main elements of the wireless power transfer system and can supply power with low energy consumption without any wires. The proposed design is characterized by the use of a piece (integral) of a high Q-factor mechanical solid-state resonator, which is characterized by the magnetostriction phenomenon. Can receive electromagnetic power in a manner.

According to the proposed invention, the solid-state mechanical resonator is driven by an external electromagnetic field at a frequency matching (corresponding) to the resonance frequency of the resonator ( Excited).

The design of the transformer (transfducer), which can ensure the high quality factor of the resonator, is essential for the efficient functioning of a wireless electromagnetic receiver.

According to the proposed invention, the solid-state mechanical resonator is made of magnetostrictive material having a high quality factor of preferably 2000 or more.

According to the proposed invention, the solid-state mechanical resonator is preferably made of magnetostrictive ferrite.

According to the proposed invention, the solid-state mechanical resonator has a form selected in such a way that the mechanical resonance mode operates at an operating frequency.

According to one of the embodiments the solid-state mechanical resonator is in the form of a cylinder.

According to yet another embodiment, the solid-state mechanical resonator has a bar shape in which a square is crossed.

According to another embodiment, the solid-state mechanical resonator is in the form of a dish.

For the efficient functioning of the wireless electromagnetic receiver, the solid-state mechanical resonator is meant to be biased by a permanent magnet.

According to one of the embodiments, the permanent magnets are made of magnetic ceramics.

According to the proposed invention, the induction transformer represents a coil surrounding the resonator.

According to the proposed invention, a coil surrounding the transformer is connected to a load.

Wireless electromagnetic receivers have evolved within a proposed solution scheme with a high quality factor compared to all known analog based mechanical resonances.

In addition, the problem is also solved by the development of a system for wireless power transfer. The system is configured as follows.

A source of an alternating magnetic field, and a wireless electromagnetic receiver, can receive power from a source of an alternating magnet field. The receiver is configured as follows.

A first device sensitive to electromagnetic fields and mechanical energy are converted into electrical power, where the receiver is an integral solid-state made of a magnetostrictive material. A mechanical resonator, and the second device is characterized by a transformer (transducer) that converts the mechanical energy of the resonator oscillation into an electrical powe.

The wireless electromagnetic receiver consists of part of a system for wireless power transfer, which may have the aforementioned characteristics.

According to one of the embodiments, the source of a variable (alternating) magnetic field is located at a frequency closer to the wavelength length λ than the non-radiating resonance at frequency f. Having a structure, where λ = c / f and c is the speed of light.

According to another embodiment, the source of a variable (alternating) magnetic field is located at a frequency f closer to the wavelength length λ, and has a non-radiating ratio. Has a non-resonant structure, where λ = c / f, where c is the speed of light

According to a third embodiment of the proposed invention, the source of the variable magnetic field is located farther from the wavelength length λ at frequency f and has a radiating structure, where λ = c / f and c is the speed of light.

1 illustrates a wireless power transfer system according to an embodiment.
FIG. 2 shows a receiver with an inductive energy transducer (transformer) and an integral solid-state mechanical resonator made of cylinder-shaped magnetostrictive material.
FIG. 3 shows an integral solid-state made of an inductive energy transducer (transformer) and a magnet in the form of a bar cross-section cross-section. The receiver is composed of a solid-state magnetostrictive resonator.
4 shows a wireless power transmission system including a proposed wireless electromagnetic receiver.

The details are described below with reference to the corresponding drawings for a better understanding of the proposed invention.

1 illustrates a wireless power transfer system according to an embodiment.

Referring to FIG. 1, a wireless power transmission system according to an embodiment includes a source 110 and a target 120. The source 110 refers to a device for supplying wireless power, and the device may include all electronic devices capable of supplying power such as a pad, a terminal, and a TV. The target 120 refers to a device that receives wireless power, and the device may include all electronic devices that require power such as a terminal, a TV, a car, a washing machine, a radio, a lamp, and the like.

The source 110 includes a Variable SMPS 111, a Power Amplifier 112, a matching network 113, a controller 114, and a communicator 115.

Variable Switching Mode Power Supply (SMPS) 111 generates a DC voltage by switching the AC voltage of the tens of Hz band output from the power supply. The variable SMPS 111 may output a DC voltage of a constant level or adjust the output level of the DC voltage according to the control of the Tx Control Logic 114.

The power detector 116 detects the output current and the voltage of the variable SMPS 111 and transmits information on the detected current and the voltage to the controller 114. In addition, the power detector 116 may detect the input current and voltage of the power amplifier 112.

The power amplifier 112 may generate power by converting a DC voltage of a constant level into an AC voltage by a switching pulse signal of several MHz to several tens of MHz bands. That is, the power amplifier 112 may generate the communication power or the charging power used in the plurality of target devices by converting the DC voltage supplied to the power amplifier 112 into an AC voltage using the reference resonance frequency FRef. have.

Here, the communication power means a small power of 0.1 to 1 mWatt, and the charging power means a large power of 1 mWatt to 200 Watt consumed in the device load of the target device. As used herein, the term "charging" may be used to mean powering a unit or element charging power. The term "charging" may also be used to mean powering a unit or element that consumes power. Here, the unit or element includes, for example, a battery, a display, a voice output circuit, a main processor, and various sensors.

In the present specification, the "reference resonance frequency" is used as the meaning of the resonance frequency that the source 110 basically uses. In addition, "tracking frequency" is used to mean a resonant frequency adjusted according to a preset scheme.

The control unit 114 detects a reflected wave for “communication power” or “charge power” and detects mismatching between the target resonator 133 and the source resonator 131 based on the detected reflected wave. The control unit 114 can detect the mismatching by detecting the envelope of the reflected wave and detecting the mismatching or detecting the amount of power of the reflected wave.

The matching network 113 may compensate the impedance mismatching between the source resonator 131 and the target resonator 133 with an optimal matching under the control of the controller 114. The matching network 113 may be connected via a switch under the control of the controller 114 to a combination of capacitors or inductors.

The controller 114 calculates a voltage standing wave ratio (VSWR) based on the level of the output voltage of the source resonator 131 or the power amplifier 112 and the voltage level of the reflected wave. If less than the set value, it may be determined that the mismatch is detected.

In addition, when the voltage standing wave ratio is smaller than a preset value, the controller 114 calculates power transmission efficiency for each of the N tracking frequencies, and determines a tracking frequency FBest having the best power transmission efficiency among the N tracking frequencies. And the FRef can be adjusted to the FBest.

Also, the control unit 114 can adjust the frequency of the switching pulse signal. The frequency of the switching pulse signal can be determined by the control of the controller 114. [ The controller 114 may generate a modulated signal for transmission to the target 120 by controlling the power amplifier 112. That is, the communication unit 115 may transmit various data 140 with the target 120 through in-band communication. In addition, the controller 114 may detect the reflected wave and demodulate a signal received from the target 120 through the envelope of the reflected wave.

The control unit 114 may generate a modulated signal for performing in-band communication through various methods. The control unit 114 can generate a modulation signal by turning on / off the switching pulse signal. In addition, the control unit 114 may perform delta-sigma modulation to generate a modulated signal. The controller 114 may generate a pulse width modulated signal having a constant envelope.

Meanwhile, the communication unit 115 may perform out-band communication using a communication channel. The communication unit 115 may include a communication module such as Zigbee or Bluetooth. The communicator 115 may transmit the target 120 and the data 140 through out-band communication.

The source resonator 131 transfers electromagnetic energy 130 to the target resonator 133. That is, the source resonator 131 transfers "communication power" or "charge power" to the target 120 through the magnetic coupling with the target resonator 133.

The target 120 includes a matching network 121, a rectifying section 122, a DC / DC converter 123, a communication section 124 and a control section 125.

The target resonator 133 receives electromagnetic energy from the source resonator 131. That is, the target resonator 133 receives "communication power" or "charging power" from the source 110 through magnetic coupling with the source resonator 131. In addition, the target resonator 133 may receive various data 140 from the source 110 through in-band communication.

The matching network 121 may match the input impedance shown to the source 110 and the output impedance shown to the load. The matching network 121 may be composed of a combination of a capacitor and an inductor.

The rectifier 122 generates a DC voltage by rectifying the AC voltage. That is, the rectifying section 122 rectifies the received AC voltage to the target resonator 133.

The DC / DC converter 123 adjusts the level of the DC voltage output from the rectifier 122 according to the capacity required by the load. For example, the DC / DC converter 123 may adjust the level of the DC voltage output from the rectifier 122 to 3 to 10 Volt.

The power detector 127 may detect the voltage of the input terminal 126 of the DC / DC converter 123 and the current and voltage of the output terminal. The detected voltage at the input 126 can be used to calculate the transmission efficiency of the power delivered from the source. The detected current and voltage at the output terminal can be used to calculate the power to which the control unit (Rx Control Logic) 125 transfers the load. The controller 114 of the source 110 may determine the power to be transmitted from the source 110 in consideration of the power required for the load and the power transmitted to the load.

When the power of the output terminal calculated by the communication unit 124 is transferred to the source 110, the power to be transmitted to the source 110 may be calculated.

The communication unit 124 may perform in-band communication for transmitting and receiving data using the resonance frequency. The control unit 125 may detect a signal between the target resonator 133 and the rectifying unit 122 to demodulate the received signal or detect the output signal of the rectifying unit 122 to demodulate the received signal. That is, the controller 125 may demodulate a message received through in-band communication. The control unit 125 can modulate the signal to be transmitted to the source 110 by adjusting the impedance of the target resonator 133 through the matching network 121. [ As a simple example, the control unit 125 may increase the impedance of the target resonator 133 so that the reflected wave is detected at the control unit 114 of the source 110. [ Depending on whether the reflected wave is generated, the controller 114 of the source 110 may detect a binary number "0" or "1".

The communication unit 124 is "type of the product of the target", "manufacturer information of the target", "model name of the target", "battery type of the target", "charging method of the target", "load of the target Impedance value "," information on the target resonator's characteristic of the target "," information on the frequency band used by the target "," power consumption of the target "," unique identifier of the target "and" The response message including the "version or specification information of the product of the target" may be transmitted to the communication unit 115 of the source 110.

Meanwhile, the communication unit 124 may perform out-band communication using a communication channel. The communication unit 124 may include a communication module such as Zigbee or Bluetooth. The communication unit 124 may transmit and receive the source 110 and the data 140 through out-band communication.

The communicator 124 receives the wake-up request message from the source 110, the power detector 127 detects the amount of power received by the target resonator 133, and the communicator 124 transmits the target resonator 133. Information about the amount of power received at may be transmitted to the source 110. At this time, the information on the amount of power received by the target resonator 133, "input voltage value and current value of the rectifier 122", "output voltage value and current value of the rectifier 122" or "DC / DC Output voltage value and current value of converter 123 ".

In FIG. 1, the controller 114 may set a resonance bandwidth of the source resonator 131. According to the setting of the resonance bandwidth of the source resonator 131, the Q-factor QS of the source resonator 131 may be determined.

In addition, the controller 125 may set a resonance bandwidth of the target resonator 133. According to the setting of the resonance bandwidth of the target resonator 133, the Q-factor of the target resonator 133 may be determined. At this time, the resonant bandwidth of the source resonator 131 can be set to be wider or narrower than the resonant bandwidth of the target resonator 133.

Through communication, the source 110 and the target 120 can share information about the resonant bandwidth of the source resonator 131 and the target resonator 133, respectively. When a higher power than the reference value is required from the target 120, the cue-factor QS of the source resonator 131 may be set to a value greater than 100. Also, when a lower power than the reference value is required from the target 120, the cue-factor QS of the source resonator 131 may be set to a value smaller than 100.

In resonant wireless power transmission, the resonance bandwidth is an important factor. When Qt is a Q-factor that takes into account the change in distance between the source resonator 131 and the target resonator 133, the change in the resonance impedance, the impedance mismatch, the reflected signal, and the like, Qt is equal to the resonance bandwidth as shown in Equation 1 below. Have an inverse relationship.

[Equation 1]

는 대역폭,

는 공진기 사이의 반사 손실, BW_S는 소스 공진기(131)의 공진 대역폭, BW_D는 타겟 공진기(133)의 공진 대역폭을 나타낸다. In Equation 1, f ₀ is the center frequency,

Is the bandwidth,

Is a reflection loss between the resonators, BW _S is the resonance bandwidth of the source resonator 131, BW _D is the resonance bandwidth of the target resonator 133.

Meanwhile, in the wireless power transmission, the efficiency U of the wireless power transmission may be defined as in Equation 2.

&Quot; (2) "

는 소스 공진기(131)에서의 반사계수,

는 타겟 공진기(133)에서의 반사계수,

는 공진 주파수, M은 소스 공진기(131)와 타겟 공진기(133) 사이의 상호 인덕턴스, R_S는 소스 공진기(131)의 임피던스, R_D는 타겟 공진기(133)의 임피던스, Q_S는 소스 공진기(131)의 Q-factor, Q_D는 타겟 공진기(133)의 Q-factor, Q_K는 소스 공진기(131)와 타겟 공진기(133) 사이의 에너지 커플링에 대한 Q-factor이다. Where K is the coupling coefficient for the energy coupling between the source resonator 131 and the target resonator 133,

Is the reflection coefficient in the source resonator 131,

Is the reflection coefficient at the target resonator 133,

Is the resonant frequency, M is the mutual inductance between the source resonator 131 and the target resonator 133, R _S is the impedance of the source resonator 131, R _D is the impedance of the target resonator 133, Q _S is the source resonator ( Q-factor, Q _D of 131, Q-factor of target resonator 133, Q _K is Q-factor for energy coupling between source resonator 131 and target resonator 133.

Referring to Equation 2, Q-factor is highly related to the efficiency of wireless power transmission.

Therefore, in order to increase the efficiency of wireless power transmission, the Q-factor is set to a high value. In this case, when Q _S and Q _D are each set to an excessively high value, a change in coupling coefficient K for energy coupling, a change in distance between the source resonator 131 and the target resonator 133, a change in resonance impedance, and an impedance miss A phenomenon in which the efficiency of the wireless power transmission may decrease due to matching or the like may occur.

In addition, if the resonance bandwidth of each of the source resonator 131 and the target resonator 133 is set too narrow in order to increase the efficiency of wireless power transmission, impedance mismatching or the like may easily occur even with a small external influence. Considering the impedance mismatch, Equation 1 may be expressed as Equation 3.

&Quot; (3) "

In FIG. 1, source 110 wirelessly transmits wake-up power for wake-up of target 120, broadcasts a configuration signal for configuring a wireless power transfer network, and configures the configuration signal. an identifier for receiving from the target 120 a search frame including a reception sensitivity value of a configuration signal, allowing joining of the target 120, and identifying the target 120 in a wireless power transmission network. The charging power may be transmitted to the target 120, the charging power may be generated through power control, and the charging power may be wirelessly transmitted to the target 120.

In addition, the target 120 receives wake-up power from at least one of the plurality of source devices, activates a communication function using the wake-up power, and establishes a wireless power transfer network of each of the plurality of source devices. Receive a configuration signal to configure, select the source 110 based on the reception sensitivity of the configuration signal, and can receive power wirelessly from the selected source (110).

FIG. 2 shows a receiver with an inductive energy transducer (transformer) and an integral solid-state mechanical resonator made of cylinder-shaped magnetostrictive material.

210—integral solid-state resonator made of cylinder-shaped magnetostrictive material

220-Permanent magnet.

230-Exciting magnetic field.

240-Load. Thin conducting layers.

250-coil.

FIG. 3 shows an integral solid-state made of an inductive energy transducer (transformer) and a magnet in the form of a bar cross-section cross-section. ) Represents a receiver made of a mechanical resonator.

310-magnetostrictive resonator in the form of a solid-state bar.

320-permanent magnet

330-Exciting magnetic field

340-load.

350-coil.

4 shows a wireless power transmission system including a proposed wireless electromagnetic receiver.

410-Source of alternating magnetic field.

420-Exciting magnetic field generated by source 410.

430-Wireless electromagnetic receiver.

이어야한다. 여기서

는 음속(sound velocity)이다. 상기 기계적 공진 모드(mechanical resonant mode)는 기계적 공진 모드가 수행될때 공진기에 저장된 기계적 에너지(mechanical energy)가 최대인 경우에 에너지 변환을 위해 적한한 방법이다. 상기 공진기(210)(도 2)는 공진기(210)의 선형(linearize) 동작과 공진기 물질의 필요한 자기변형(magnetostrictive) 특성을 보장하기위해 공진기로부터 짧은 거리에 위치한 영구적(permanent) 자석(220)에 의해 바이어스(biased) 된다. 영구적 자석(220)은 가급적 세라믹(ceramic) 물질로 만들어진다. 상기 자석은 시스템 효율면에서의 영향을 고려하지 않고 공진기 가까이에 놓일 수 있다. 상기 공진기(210)는 외부 가변 자기장(external variable magnet field)(230)에의해 동작된다. 상기 교류(alternating)(가변(variable)) 자기장 (230)은 자기변형 현상(magnetostriction phenomenon) 때문에 공진기(210)에서 기계적 발진(mechanical oscillations)을 발생시킨다. 공진 주파수(resonance frequency) f 에서 상기 발진의 크기는 공진기(210) 물질(material)의 퀄리티 팩터(quality factor) Q에 의존한다. Q-팩터(Q-factor)가 높을수록 더 큰 발진 크기(amplitude of oscillations)를 갖는다. 그러므로, 가장 높은 퀄리티 팩터(quality factor)의 보장이 요구된다. 또한, 발진의 크기(amplitude of oscillations)는 공진기(210) 물질(material)의 자기변형 성질에 의존한다. 그러므로 제안된 수신기를 위해 가급적 높은 효율의 자기변형 물질을 사용한다.The first functional portion of the proposed receiver 430 represents an integral solid-state mechanical resonator 210 or 310 made of magnetostrictive material made of permanent magnet 220 (FIGS. 2 and 3). . The solid-state resonator 210 or 310 is made of magnetostrictive material with a high quality factor (Q> 2000). For example, magnetostrictive ferrite may be used. The resonator should preferably be in the form of a plate, cylindrical or rectangular rod (bar), or may have other geometric shapes. The geometry of the resonator is selected so that a mechanical resonance mode is performed at the operating frequency f of the resonator. For example, for a longitudinal mechanical resonance mode the size of the resonator in one dimension is at least approximately

Should be here

Is the sound velocity. The mechanical resonant mode is a suitable method for energy conversion when the mechanical energy stored in the resonator is maximum when the mechanical resonant mode is performed. The resonator 210 (FIG. 2) is connected to a permanent magnet 220 located at a short distance from the resonator to ensure the linearize operation of the resonator 210 and the necessary magnetostrictive properties of the resonator material. Biased. The permanent magnet 220 is preferably made of ceramic material. The magnet can be placed near the resonator without considering the effect on system efficiency. The resonator 210 is operated by an external variable magnet field 230. The alternating (variable) magnetic field 230 generates mechanical oscillations in the resonator 210 because of the magnetostriction phenomenon. The magnitude of the oscillation at resonance frequency f depends on the quality factor Q of the material of resonator 210. The higher the Q-factor, the larger the amplitude of oscillations. Therefore, a guarantee of the highest quality factor is required. Also, the amplitude of oscillations depends on the magnetostriction of the material of resonator 210. Therefore, we use high efficiency magnetostrictive materials for the proposed receiver.

The second functional portion of the wireless electromagnetic receiver 430 represents a power (energy) converter. Use of an inductive transformer (FIGS. 2 and 3) showing a coil 250 surrounding the periphery of an integral solid-state mechanical resonator made of magnetostrictive material in the proposed invention. This has been proposed. The structure of the transformer ensures that the quality factor of the resonator does not decrease. Mechanical oscillation of the resonator surface generates a variable mechanical tension, which in turn generates a variable element of resonator magnetization. (Transverse magnetostriction effect). Variable magnetization induces voltage oscillation at the end of the coil 250. An end of the coil 250 is connected to a load 240.

The proposed wireless electromagnetic receiver 430 may be used as an element of a system for the purpose of wireless power transfer.

The system of wireless power transfer (FIG. 4) is constructed as follows: a source 410 of variable magnet fields; The proposed wireless electromagnetic receiver 430 receives power from a source 410. The frequency of the alternating (variable) magnetic field corresponding to the resonant frequency of the receiver 430 is generated by the source 410. Therefore, the use of various sources of variable magnetic fields is possible.

At a frequency f, located at a distance closer to the wavelength length λ, and having a non-radiating resonant structure, where λ = c / f, c is the speed of light and source Is provided by In this case, the source and receiver contribute to the power transmission resonance system.

Non-radiative non-resonance structures can also be provided from a source. For example, this can be done by placing the coil connected to the oscillator at a distance closer to the wavelength length λ. Where λ = c / f and c is the speed of light.

The source is located at a distance greater than the wavelength length λ at a frequency f and has a radiating structure, where λ = c / f and c is the speed of light.

The proposed invention can be carried out in a wireless power transfer system that allows the power supply required for low-power compact devices, especially without any cables or wires. The proposed solution is suitable for those who prefer to use in particularly low frequencies, such as biological systems.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (29)

A first device responsive to an electromagnetic field; And
A second device that converts mechanical energy into electrical power and contacts with the first device,
The first device is an integral solid-state mechanical resonator made of magnetostrictive material, the second device is a transducer for converting mechanical energy generated based on the oscillation of the mechanical resonator to the electrical power,
The inductive transducer is not mechanically connected to the resonator.
Wireless power transfer system. The method of claim 1,
The mechanical resonator
Operated by an external electromagnetic field at the resonant frequency of the resonator
Wireless electromagnetic receiver.
The method of claim 1,
The converter
Maintaining a quality factor of the mechanical resonator
Wireless electromagnetic receiver. The method of claim 1,
The mechanical resonator
Made of magnetostriction material with quality factor greater than 2000
Wireless electromagnetic receiver. The method of claim 1,
The mechanical resonator
Made of magnetostriction ferrite
Wireless electromagnetic receiver. The method of claim 1,
The mechanical resonator
Having a shape selected in such a way that the mechanical resonance mode is carried out at the working frequency.
Wireless electromagnetic receiver. The method according to claim 6,
The mechanical resonator
In the form of a cylinder
Wireless electromagnetic receiver. The method according to claim 6,
The mechanical resonator
Square is a cross-section of the bar
Wireless electromagnetic receiver. The method according to claim 6,
The mechanical resonator
In the form of a plate
Wireless electromagnetic receiver. The method of claim 1,
The mechanical resonator
Operated biased by a permanent magnet
Wireless electromagnetic receiver. The method of claim 10,
The permanent magnet is
Made of magnetic ceramics
Wireless electromagnetic receiver. The method of claim 1,
The mechanical energy transducer is a coil surrounding the resonator caution.
Wireless electromagnetic receiver. The method of claim 12,
The coil end of the inductive transducer is connected to the load
Wireless electromagnetic receiver. A source generating a variable magnetic field; And
A wireless electromagnetic receiver for receiving energy from the source,
The wireless electromagnetic receiver includes a first device responsive to an electromagnetic field; And
Converting mechanical energy into electrical power and including a second device connected with the first device,
The first device is an integral solid-state mechanical resonator made of magnetostrictive material, the second device is a transducer for converting mechanical energy generated based on the oscillation of the mechanical resonator to the electrical power,
The inductive transducer is not mechanically connected to the resonator.

Wireless power transfer system. 15. The method of claim 14,
The mechanical resonator
Operated by an external electromagnetic field at the resonant frequency of the resonator
Wireless power transfer system. 20. The method of claim 19,
The transducer maintains a quality factor of the mechanical resonator.
Wireless power transfer system. 15. The method of claim 14,
The mechanical resonator is made of a magnetostriction material having a quality factor greater than 2000.
Wireless power transfer system. 18. The method of claim 17,
The mechanical resonator
Made of magnetostriction ferrite
Wireless power transfer system. 15. The method of claim 14,
The mechanical resonator
Having a shape selected in such a way that the mechanical resonance mode is carried out at the working frequency.
Wireless power transfer system. 20. The method of claim 19,
The mechanical resonator
In the form of a cylinder
Wireless power transfer system. 20. The method of claim 19,
The mechanical resonator
Square is a cross-section of the bar
Wireless power transfer system. 20. The method of claim 19,
The mechanical resonator
In the form of a plate
Wireless power transfer system. 15. The method of claim 14,
The mechanical resonator
Operated biased by a permanent magnet
Wireless power transfer system. 24. The method of claim 23,
The permanent magnet is
Made of magnetic ceramics
Wireless power transfer system. 15. The method of claim 14,
The transducer is performed by a coil surrounding the resonator
Wireless power transfer system. 26. The method of claim 25,
The coil surrounding the inducer is connected to a load
Wireless power transfer system. 15. The method of claim 14,
The source
At frequency f, located at a distance closer than the wavelength length λ, and having a non-radiating resonant structure, where λ = c / f, where c is the speed of light
Wireless power transfer system. 15. The method of claim 14,
The source
At frequency f, located at a distance closer than the wavelength length λ, and having a non-radiating non-resonant structure, where λ = c / f, c is the speed of light sign
Wireless power transfer system. 20. The method of claim 19,
The source
At a frequency f, located farther than the wavelength length λ, it has a radiating structure, where λ = c / f, where c is the speed of light
Wireless power transfer system.

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