KR101952595B1 - Wireless electromagnetic receiver and wireless power transfer system - Google Patents

Abstract

A system and apparatus for wirelessly transmitting power without a cable wherein the wireless power transmission system includes a source for generating a variable magnetic field and a wireless electromagnetic receiver for receiving energy from the source a wireless electromagnetic receiver). A wireless electromagnetic receiver may include a first device responsive to an electromagnetic field and a second device coupled to the first device for converting mechanical energy into electric power.

Description

≪ Desc / Clms Page number 1 > WIRELESS ELECTROMAGNETIC RECEIVER AND WIRELESS POWER TRANSFER SYSTEM < RTI ID =

The following embodiments relate to a system and apparatus for transmitting power without a wireless power transmission, i.e., a cable.

Electromagnetic wireless power transfer systems can be classified as radiative and non-radiative systems. Radiative 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 the resonance power transfer technique 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.

In the case of a resonator structure used in a resonant power transmission system, it can also be used in non-resonance systems. For example, it can also be used in radiative systems.

A disadvantage of the electromagnetic resonator structure is that the process of a small-sized sensitive electromagnetic resonator having a high quality factor (Q-factor, Q) is complicated. Another disadvantage is that the production of an electromagnetic resonator with a high Q-factor and a low resonance frequency is complicated. 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 includes a first device that is responsive to an electromagnetic field, and a second device that converts mechanical energy into electric power and is in contact with the first device. Wherein the first device is an integral solid-state mechanical resonator made of a magnetostrictive material and the second device is a mechanical resonator that generates mechanical energy based on oscillation of the mechanical resonator, Power converter.

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 selected shape in such a manner that a mechanical resonance 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 may be made of magnetic ceramics.

The transducer may be a precharged capacitor converter from a voltage source.

The capacitor converter may include a constant voltage source connected to the two conductive layers by two conductive layers and a protective choke.

At least one of the two electret condenser converters may operate as a metallized surface covering a portion of the mechanical resonator surface.

At least one of the two conductive layers may operate as a conductor mechanically connected to the surface of the mechanical resonator.

At least one of the two conductive layers may not be mechanically coupled to the mechanical resonator.

The two conductive layers may form a precharged capacitor.

The two conductive layers may be connected to a load via a capacitor.

In one aspect, a wireless power transmission system includes a source for generating a variable magnetic field and a wireless electromagnetic receiver for receiving energy from the source, A first device responsive to an electromagnetic field and a second device converting mechanical energy into electric power and being coupled to the first device, And the second device may be a transducer that converts the mechanical energy generated based on the oscillation of the mechanical resonator into the electrical power.

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 selected shape in such a manner that a mechanical resonance 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 may be made of magnetic ceramics.

The transducer may be a precharged capacitor converter from an external voltage source.

The capacitor converter may include a constant voltage source connected to the two conductive layers by two conductive layers and a protective choke.

At least one of the two conductive layers may operate as a metallized surface covering a portion of the mechanical resonator surface.

At least one of the two conductive layers may operate as a conductor mechanically coupled to the surface of the mechanical resonator.

At least one of the two conductive layers may not be mechanically coupled to the mechanical resonator.

The two conduction layers may be composed of precharged capacitors.

The two conductive layers may be connected to a load through a capacitor.

Wherein the source is located at a distance less than a wavelength length l at a frequency f and has a non-radiating resonant structure where lambda = c / f and c is the speed of light .

The source is located at a distance of less than the wave length? At frequency f and has a non-radiating non-resonant structure where? = C / f and c = It can be the speed of light.

The source is located at a distance greater than the wave length? At frequency f and has a radiating structure, where? = C / f and c can be the speed of light.

1 shows a wireless power transmission system according to one embodiment.
2 shows a wireless electromagnetic receiver according to one embodiment.
3 shows a wireless electromagnetic receiver according to another embodiment.
4 shows a wireless power transmission system according to another embodiment.

Hereinafter, embodiments according to one aspect will be described in detail with reference to the accompanying drawings.

1 shows a wireless power transmission system according to one embodiment.

Referring to FIG. 1, a wireless power transmission system according to one embodiment includes a source 110 and a target 120. The source 110 refers to a device that supplies 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 is a device that receives wireless power, and the device may include all electronic devices requiring power such as a terminal, a TV, an automobile, a washing machine, a radio, and a lamp.

The source 110 includes a Variable SMPS 111, a Power Amplifier 112, a matching network 113, a control unit 114 and a communication unit 115.

A variable SMPS (Switching Mode Power Supply) 111 generates a DC voltage by switching an AC voltage of several tens Hz outputted from a power supply. The variable SMPS 111 can 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 voltage of the variable SMPS 111 and transmits information on the detected current and voltage to the controller 114. Also, the power detector 116 may detect the input current and voltage of the power amplifier 112.

The power amplifier 112 can generate power by converting a DC voltage of a certain level into an AC voltage by a switching pulse signal of several MHz to several tens MHz. That is, the power amplifier 112 converts the DC voltage supplied to the power amplifier 112 into an AC voltage using the reference resonance frequency FRef to generate power for communication or charge for use in a plurality of target devices 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, a unit or an element includes, for example, a battery, a display, a sound output circuit, a main processor, and various sensors.

In the present specification, the term "reference resonance frequency" is used to mean a resonance frequency that the source 110 basically uses. The "tracking frequency" is used to mean a resonance frequency adjusted according to a preset method.

The control unit 114 detects the reflected wave for the "communication power" or the "charging power" and detects the 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 can compensate the impedance mismatch between the source resonator 131 and the target resonator 133 under optimum control by the control unit 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 control unit 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, It can be determined that the mismatching has been detected if it is greater than the set value.

If the voltage standing wave ratio is greater than the predetermined value, the controller 114 calculates the power transmission efficiency for each of the N tracking frequencies and determines the tracking frequency FBest having the highest power transmission efficiency among the N tracking frequencies , The FRef may be adjusted by 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 control unit 114 can generate a modulation signal for transmission to the target 120 by controlling the power amplifier 112. [ That is, the communication unit 115 can transmit the target 120 and various data 140 through the in-band communication. In addition, the control unit 114 can detect the reflected wave and demodulate the 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 communication unit 115 may transmit the target 120 and the data 140 through out-band communication.

The source resonator 131 transfers the electromagnetic energy 130 to the target resonator 133. That is, the source resonator 131 transmits the "communication power" or "charging power" to the target 120 through 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 via in-band communication.

The matching network 121 can match the input impedance seen toward the source 110 side and the output impedance seen toward the load side. The matching network 121 may be composed of a combination of a capacitor and an inductor.

The rectifying unit 122 rectifies the AC voltage to generate a DC 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 rectifying unit 122 to a capacity required for the load. For example, the DC / DC converter 123 can adjust the level of the DC voltage output from the rectifying unit 122 to 3 to 10 Volts.

The power detector 127 can detect the voltage of the input terminal 126 of the DC / DC converter 123 and the current and voltage of the output terminal. The voltage of the detected input 126 may be used to calculate the transmission efficiency of the power delivered at 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 through the communication unit 124 is transferred to the source 110, power to be transmitted to the source 110 can be calculated.

The communication unit 124 can 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 control unit 125 can demodulate the received message through the 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 or not the reflected wave is generated, the control unit 114 of the source 110 can detect the binary number "0" or "1 ".

The communication unit 124 stores the information on the type of the target, the type of product of the target, the manufacturer information of the target, the model name of the target, the battery type of the target, Quot ;, "information on the characteristics of the target resonator of the target "," information on the used frequency band of the target ", "amount of power consumed by the target "," To the communication unit 115 of the source 110, a response message including "version or standard information of the target product ".

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 can transmit and receive the data 110 and the data 140 through out-band communication.

The communication unit 124 receives a wake-up request message from the source 110. The power detector 127 detects the amount of power received by the target resonator 133. The communication unit 124 detects the amount of power received by the target resonator 133, Lt; RTI ID = 0.0 > 110 < / RTI > The information on the amount of power received by the target resonator 133 may be information on the input voltage value and the current value of the rectifying section 122 or the output voltage value and current value of the rectifying section 122 or the DC / Output voltage value and current value of the converter 123 ".

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

In addition, the controller 125 may set the resonance bandwidth of the target resonator 133. The Q-factor of the target resonator 133 can be determined in accordance with the setting of the resonance bandwidth of the target resonator 133. [ 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. The Q-factor QS of the source resonator 131 can be set to a value larger than 100 when a higher power is required from the target 120 than the reference value. In addition, when the target 120 requires a lower power than the reference value, the Q-factor QS of the source resonator 131 can be set to a value smaller than 100. [

In resonant wireless power transmission, resonant bandwidth is an important factor. Qt is a Q-factor that takes into consideration both a change in distance between the source resonator 131 and the target resonator 133, a change in resonant impedance, an impedance mismatching, a reflection signal, etc. Qt is expressed by Equation (1) 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,

Bandwidth,

BW _S is the resonant bandwidth of the source resonator 131, and BW _D is the resonant bandwidth of the target resonator 133. [

On the other hand, in the wireless power transmission, the efficiency U of the wireless power transmission can be defined as shown 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 at the source resonator 131,

The reflection coefficient of the target resonator 133,

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 resonance frequency of the source resonator 131) Q-factor, Q _D of the Q-factor, Q _K of the target cavity (133) is a Q-factor of the energy coupling between the source resonator 131 and the target resonator 133.

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

Therefore, the Q-factor is set to a high value in order to increase the efficiency of the wireless power transmission. At this time, when Q _S and Q _D are 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, The efficiency of the wireless power transmission may decrease due to matching or the like.

If the resonance bandwidth of each of the source resonator 131 and the target resonator 133 is set too narrow to increase the efficiency of the wireless power transmission, impedance mismatching and the like can easily occur even with a small external influence. Considering impedance mismatch, Equation (1) can be expressed as Equation (3).

&Quot; (3) "

In Figure 1, the source 110 wirelessly transmits wake-up power for wake-up of the target 120, broadcasts a configuration signal for configuring the wireless power transmission network, receives a search frame from the target 120 that includes a received sensitivity value of a configuration signal, permits the joining of the target 120, and identifies an identifier for identifying the target 120 in the wireless power transmission network To the target 120, to generate charging power through power control, and to transmit the charging power to the target 120 wirelessly.

In addition, the target 120 may receive wakeup power from at least one of the plurality of source devices, activate the communication function using the wake-up power, and transmit the wireless power transmission network of each of the plurality of source devices Select a source 110 based on the reception sensitivity of the configuration signal, and receive power from the selected source 110 wirelessly.

2 shows a wireless electromagnetic receiver according to one embodiment.

The wireless electromagnetic receiver 200 according to one embodiment includes a resonator 210 made of a plane-shaped magnetostrictive material and a precharged from an external power source 280. [ A capacitor-based energy converter.

200 - Wireless electromagnetic receiver

210 - Planar-shaped resonator of an integral solid-state made of magnetostrictive material.

220 - Permanent magnet

230 - Direction of the magnetic field

240 and 250 - thin conducting layers

260 - Capacitor

270 - Load

280 - an external power supply, for example a voltage source,

290 - Protective choke

The precharged capacitor may be formed when power is supplied from the external power supply 280 to the thin conductive layer 240 and the thin conductive layer 250. That is, the energy converter may be comprised of a thin conductive layer 240, a thin conductive layer 250, and an external power supply 280.

3 shows a wireless electromagnetic receiver according to another embodiment.

The wireless electromagnetic receiver 300 according to one embodiment includes a capacitor-based energy converter from a pre-charged external power source 380 and a solid-state power source, made of a magnetostrictive material, And a mechanical resonator 310 in the form of a cylinder.

300 - Wireless electromagnetic receiver

310 - Solid state cylindrical resonator made of magnetostrictive material

320 - Permanent magnet

330 - Excited magnetic field

340, 350 - Thin conducting layers

360 - Capacitor

370 - load

380 - an external power supply, for example a voltage source,

390 - Protective choke

The precharged capacitor may be formed when power is supplied from the external power supply 380 to the thin conductive layer 340 and the thin conductive layer 350. That is, the energy converter may be comprised of a thin conductive layer 340, a thin conductive layer 350, and an external power supply 380.

4 shows a wireless power transmission system according to another embodiment.

A wireless power transmission system according to one embodiment may include a source 410 and a wireless electromagnetic receiver 430. [

410 - a source that generates an alternating magnetic field

420 - a magnetic field generated by a source 410

430 - Wireless electromagnetic receiver

과 동일해야 한다. 여기서

는 음속(sound velocity)이다. 기계적 공진 모드(mechanical resonant mode)는 공진기(210)에 저장된 기계적 에너지(mechanical energy)가 최대인 경우에 에너지 변환을 위한 최적의 방법이다.The first functional portion of the wireless electromagnetic receiver 430 may be represented by a permanent magnet 220 of Figure 2 and a solid-state resonator 210 made of a magnetostrictive material . The resonator 210 may be made of a magnetostrictive material having a high quality factor (Q > 2000). For example, magnetostrictive ferrite may be used. The resonator 210 may be in the form of a plate, a cylindrical rod or a rectangular rod, or may have various other geometric shapes. The geometry of the resonator may be chosen such that a mechanical resonance mode is performed at the operating frequency f of the resonator 210. For example, in one dimension, for a longitudinal mechanical resonance mode, the size of the resonator may be at least approximately

. here

Is the sound velocity. The mechanical resonant mode is an optimal method for energy conversion when the mechanical energy stored in the resonator 210 is the maximum.

The resonator 210 is biased by a permanent magnet 220 located at a short distance to ensure the linearization of the resonator 210 and the necessary magnetostrictive characteristics of the resonator 210. [ ). The permanent magnets 220 may be made of a ceramic material. The permanent magnet 220 can be placed near the resonator 210 without considering the influence in terms of system efficiency.

The resonator 210 may be operated by an external variable magnet field 230. The external variable magnetic field 230 may cause mechanical oscillations in the resonator 210 due to a magnetostriction phenomenon. The amplitude of the oscillation at the resonance frequency f depends on the quality factor Q of the material constituting the resonator 210. [ The larger the quality factor, the larger the amplitude of oscillations. Therefore, it is required to guarantee the highest quality factor. In addition, the amplitude of oscillations depends on the magnetostrictive property of the material constituting the resonator 210. Therefore, a special magnetostrictive material may be used for the wireless electromagnetic receiver 200.

The second functional portion of the wireless electromagnetic receiver 430 may be represented by a power converter. 2, the use of a capacitor-based transformer that includes two thin conductive layers 240 and 250 and that is precharged from an external power supply 280 A constant voltage source 280 is provided that includes a conduction layer 240 and a conduction layer 240 through a protective choke that protects an external constant voltage source 280 from an alternating voltage, (Not shown). The conductive layer 240 can be used as a metallized surface covering a portion of the surface of the resonator 210 or as a conductor mechanically coupled to the surface of the resonator 210 . The conductive layer 250 may be located near the resonator 210 and the structure of the conductive layer 240 and the conductive layer 250 may form a precharged capacitor. This combined structure of the transducer can ensure that the quality factor of the resonator 210 does not decrease. The mechanical oscillations that occur at the surface of the resonator 210 coupled with the conductive layers 240 and the conductive layer 250 can cause voltage oscillations in the capacitor. The conductive layer 240 and the conductive layer 250 may be connected to the load 270 through a capacitor 260 that protects the direct current from flowing to the circuit.

A wireless electromagnetic receiver 430 may be used as a component of a system for wireless power transfer purposes.

4, a wireless power transfer system includes a source 410 for generating variable magnet fields, a wireless electromagnetic receiver 410 for receiving power from a source 410, and a wireless electromagnetic receiver 430. The frequency of the variable magnetic field 420 may be generated by the source 410 and may correspond to the resonant frequency of the wireless electromagnetic receiver 430. Therefore, various kinds of variable magnetic fields 420 can be generated according to various kinds of sources 410. [

The source 410 of the non-radiative resonant structure of frequency f is located at a distance less than the wavelength length? From the wireless electromagnetic receiver 430 where? = C / f And c represents the speed of light. In this case, the source 410 and the wireless electromagnetic receiver 430 may form a wireless power transmission system.

A source 410 of a non-radiative non-resonance structure may also be used. For example, a coil can be implemented by being connected to an oscillator and located at a distance closer to the wavelength length?, Where? = C / f.

A source 410 of a Radiative structure having a frequency f , which is located at a distance greater than the wavelength length? From the wireless electromagnetic receiver 430, may be used. Here,? = C / f.

A wireless power transmission system according to one embodiment may be applied to a wireless power transmission system that allows power supply for a low-power compact device without cables or wires. A wireless power transmission system according to one embodiment may be suitable for areas that prefer to use low frequencies, such as, for example, biological systems.

A wireless electromagnetic receiver according to one embodiment includes a mechanical resonator and can operate by a magnetic field due to magnetostriction phenomenon. The mechanical resonator may have a high Q factor, regardless of size and frequency. At this time, the Q factor may be about 10 ³ to 10 ⁴ . Thus, the mechanical resonator may be suitable for use in applications that are compact and use low-frequency.

A wireless electromagnetic receiver according to one embodiment uses an integral solid-state resonator made of a magnitostriction material as a basic configuration. At this time, the resonator may be composed of a pure solid material rather than a compound. The piezo-electric layer can be replaced by an energy transducer, which can be located close to the perimeter of the resonator and in contact with the resonator. The energy converter has a Q factor of the resonator The arrangement and use of such an energy converter can significantly increase the Q factor of the wireless electromagnetic receiver.

In addition, the use of permanent magnets permits linearity of magnetostriction characteristics and can increase the sensitivity of the response of the receiver to a variable magnetic field.

A resonant based receiver for wireless power transmission according to an embodiment may have a high Q factor (Q> 2000) and a small size (~ 1 cm) and may be applied to applications with low frequencies (f <1 MHz) . For example, a high Q factor may be the case where Q is greater than 2000, a small size may be less than 1 centimeter, and a lower frequency may be less than 1 megahertz.

The effect of the above technique can be achieved thanks to the advancement of the advanced design of a wireless electromagnetic receiver comprising:

- a first device sensitive to electromagnetic fields

A second device positioned in contact with the first device and converting mechanical energy into electric power;

The first device may be an integral solid-state mechanical resonator made of a magnetostriction material, and the second device may be a transducer converting the mechanical energy of the oscillation generated in the mechanical resonator into electrical energy. have.

In an activated mode of a wireless electromagnetic receiver according to an embodiment, the solid state mechanical resonator may be drived by an external electromagnetic field at a frequency that is matched to the resonant frequency of the mechanical resonator.

The design of transducers to ensure a high quality factor of mechanical resonators is essential for the efficient functioning of wireless electromagnetic receivers.

Wireless electromagnetic receivers can have a high quality factor compared to other known techniques based on mechanical resonance.

A wireless power transmission system according to one embodiment may include a source and a wireless electromagnetic receiver. The source may generate a variable magnetic field, and the wireless electromagnetic receiver may receive power from the source. A wireless electromagnetic receiver may include a first device that is sensitive to electromagnetic fields and a second device that is located in contact with the first device and that converts mechanical energy into electric power.

The first device may be an integral solid-state mechanical resonator made of a magnetostriction material, and the second device may be a transducer converting the mechanical energy of the oscillation generated in the mechanical resonator into electrical energy. have.

A wireless electromagnetic receiver is composed of a part of a system for wireless power transfer which may have the aforementioned characteristics.

According to the proposed invention, a capacitor converter representing a precharged capacitor from an external power supply can be used. In the capacitor, one conductor surface may be a metallized surface covering at least a portion of the mechanical resonator surface, or at least a conductor mechanically connected to a portion of the mechanical resonator surface. Mechanical oscillations of the mechanical resonator surface can generate AC voltages on the capacitor plates.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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 machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI &gt; or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (39)

A first device responsive to an electromagnetic field; And
A second device for converting mechanical energy into electric power and contacting the first device,
The first device is an integral solid-state mechanical resonator made of a magnetostrictive material,
Wherein the second device is a transducer that converts mechanical energy generated on the basis of oscillation of the mechanical resonator into the electrical power, and wherein at least one of the plurality of conduction layers is connected to the first device, / RTI &gt;
Wherein the oscillation generates a voltage oscillation in the plurality of conductive layers,
Wireless electromagnetic receivers. The method according to claim 1,
The mechanical resonator
Which is operated by an external electromagnetic field at the resonant frequency of the resonator
Wireless electromagnetic receivers. The method according to claim 1,
The converter
Maintaining a quality factor of the mechanical resonator
Wireless electromagnetic receivers. The method according to claim 1,
The mechanical resonator
Made of a magnetostrictive material having a quality factor greater than &lt; RTI ID = 0.0 &gt; 2000 &lt; / RTI &
Wireless electromagnetic receivers. The method according to claim 1,
The mechanical resonator
Made of magnetostriction ferrite
Wireless electromagnetic receivers. The method according to claim 1,
The mechanical resonator
Having a shape selected in such a way that a mechanical resonance mode is performed at a working frequency
Wireless electromagnetic receivers. The method according to claim 6,
The mechanical resonator
In the form of a cylinder
Wireless electromagnetic receivers. The method according to claim 6,
The mechanical resonator
In the case of a bar-shaped cross-section,
Wireless electromagnetic receivers. The method according to claim 6,
The mechanical resonator
In the form of a plate
Wireless electromagnetic receivers. The method according to claim 1,
The mechanical resonator
Biased by a permanent magnet,
Wireless electromagnetic receivers. 11. The method of claim 10,
The permanent magnet
Made of magnetic ceramics
Wireless electromagnetic receivers. The method according to claim 1,
The converter
Which is a capacitor converter precharged from an external voltage source
Wireless electromagnetic receivers. 13. The method of claim 12,
The capacitor converter
A constant voltage source connected to the conductive layers by a protective choke,
Gt; The method according to claim 1,
Wherein at least one of the conductive layers
And which acts as a metallized surface covering a portion of the surface of the mechanical resonator.
Wireless electromagnetic receivers. The method according to claim 1,
Wherein at least one of the conductive layers
Which acts as a conductor mechanically connected to the surface of the mechanical resonator
Wireless electromagnetic receivers. The method according to claim 1,
Wherein at least one of the conductive layers
And a second resonator that is not mechanically connected to the mechanical resonator
Wireless electromagnetic receivers. 17. The method according to any one of claims 13 to 16,
The conductive layers
Constituting a precharged capacitor
Wireless electromagnetic receivers. The method according to claim 1,
The conductive layers
Connected to a load through a capacitor
Wireless electromagnetic receivers. A source for generating a variable magnetic field; And
And a wireless electromagnetic receiver for receiving energy from the source,
The wireless electromagnetic receiver comprising: a first device responsive to an electromagnetic field; And
A second device for converting mechanical energy into electric power and being connected to the first device,
The first device is an integral solid-state mechanical resonator made of a magnetostriction material,
Wherein the second device is a transducer that converts mechanical energy generated on the basis of oscillation of the mechanical resonator into the electrical power, and wherein at least one of the plurality of conduction layers is connected to the first device, / RTI &gt;
Wherein the oscillation generates a voltage oscillation in the plurality of conductive layers,
Wireless power transmission system. 20. The method of claim 19,
The mechanical resonator
Which is operated by an external electromagnetic field at the resonant frequency of the resonator
Wireless power transmission system. 20. The method of claim 19,
Wherein the transducer maintains a quality factor of the mechanical resonator
Wireless power transmission system. 20. The method of claim 19,
The mechanical resonator is made of a magnetostriction material having a quality factor greater than 2000
Wireless power transmission system. 23. The method of claim 22,
The mechanical resonator
Made of magnetostriction ferrite
Wireless power transmission system. 20. The method of claim 19,
The mechanical resonator
Having a shape selected in such a way that a mechanical resonance mode is performed at a working frequency
Wireless power transmission system. 25. The method of claim 24,
The mechanical resonator
In the form of a cylinder
Wireless power transmission system. 25. The method of claim 24,
The mechanical resonator
In the case of a bar-shaped cross-section,
Wireless power transmission system. 25. The method of claim 24,
The mechanical resonator
In the form of a plate
Wireless power transmission system. 20. The method of claim 19,
The mechanical resonator
Biased by a permanent magnet,
Wireless power transmission system. 29. The method of claim 28,
The permanent magnet
Made of magnetic ceramics
Wireless power transmission system. 20. The method of claim 19,
The converter
Which is a capacitor converter precharged from an external voltage source
Wireless power transmission system. 31. The method of claim 30,
The capacitor converter
A constant voltage source connected to the conductive layers by a protective choke,
And a wireless power transmission system. 20. The method of claim 19,
Wherein at least one of the conductive layers
And which acts as a metallized surface covering a portion of the surface of the mechanical resonator.
Wireless power transmission system. 20. The method of claim 19,
Wherein at least one of the conductive layers
Which acts as a conductor mechanically connected to the surface of the mechanical resonator
Wireless power transmission system. 20. The method of claim 19,
Wherein at least one of the conductive layers
And a second resonator that is not mechanically connected to the mechanical resonator
Wireless power transmission system. 35. The method according to any one of claims 31 to 34,
The conductive layers
Constituting a precharged capacitor
Wireless power transmission system. 20. The method of claim 19,
The conductive layers
Connected to a load through a capacitor
Wireless power transmission system. 20. The method of claim 19,
The source
At a frequency f, located at a distance less than the wave length λ and having a non-radiating resonant structure, where λ = c / f and c is the speed of light
Wireless power transmission system. 20. The method of claim 19,
The source
At a frequency f, near the wavelength length lambda and has a non-radiating non-resonant structure, where lambda = c / f and c is the speed of light sign
Wireless power transmission system. 20. The method of claim 19,
The source
Is located at a distance greater than the wave length? At frequency f and has a radiating structure, where? = C / f and c is the speed of light
Wireless power transmission system.

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