KR20230102683A - Apparatus for wireless power and two-way data transmission using single coil - Google Patents

Abstract

The present invention is a wireless power transmission device using a single coil, including a downlink modulation module for modulating a wireless power signal, a power amplification module for amplifying power of the modulated wireless power signal, and a transmission coil module, the wireless power transmission A first matching module that transmits the amplified wireless power signal by matching the resonant frequency and impedance of the device and the wireless power receiver, and receives a signal from the wireless power receiver, and data received from the wireless power receiver and an uplink demodulation module that demodulates, and the first matching module may transmit the wireless power signal and receive the signal from the wireless power receiver at the same time.

Description

Wireless power and two-way data transmission and reception device using a single coil {APPARATUS FOR WIRELESS POWER AND TWO-WAY DATA TRANSMISSION USING SINGLE COIL}

The present invention relates to a wireless power and two-way data transmission device, and more particularly, to a wireless power and two-way data transmission and reception device that can be miniaturized using a single coil and can perform wireless power transmission and data transmission and reception simultaneously.

Wireless power transmission is a technology that can transmit power without wires. Wireless power transmission is expanding its application due to its advantage of overcoming situations where wired connection is dangerous or impossible and supplying power. In particular, recent wireless power transmission technology has been widely used in the field of implantable medical devices (IMD). In the field of implantable medical devices (IMD), wireless power transmission technology is inevitably low in efficiency due to limitations in size and environment due to the characteristics of devices implanted in the human body. Therefore, it is necessary to minimize the power use of the wireless power transmission device, and reducing the power used for data transmission is the most efficient way to minimize the power use.

Currently, in the case of implantable medical devices (IMD), a low-power, short-distance data transmission method using a wireless power coil is used, but the existing method uses a single coil for uplink or downlink unidirectional communication. only is possible In order to implement two-way communication through the existing method, there is a problem in that a coil or an antenna for a communication channel must be additionally provided in addition to a coil for wireless power, so there is difficulty in miniaturization. In addition, when bidirectional communication is implemented using a half-duplex (HD) method in which uplink and downlink are used through time division while using a coil for wireless power, a separate protocol for time division data transmission is used. There is a problem that needs this.

An object of the present invention to solve the above problems is to provide a wireless power transmitter capable of transmitting and receiving two-way data while simultaneously transmitting radio power using a single wireless power coil without an additional coil or antenna.

An object of the present invention to solve the above problems is to provide a wireless power receiver capable of transmitting and receiving two-way data while simultaneously receiving radio power using a single wireless power coil without an additional coil or antenna.

An object of the present invention to solve the above problems is to provide a wireless power and two-way data transmission and reception device capable of transmitting and receiving two-way data while simultaneously transmitting radio power using a single wireless power coil without an additional coil or antenna.

A wireless power transmitter according to an embodiment of the present invention for achieving the above object is a wireless power transmitter using a single coil, a downlink modulation module for modulating a wireless power signal, and amplifying the power of the modulated wireless power signal. A power amplification module and a transmission coil module to transmit the amplified wireless power signal by matching the resonance frequency and impedance of the wireless power transmitter and the wireless power receiver, and to receive a signal from the wireless power receiver A first matching module and an uplink demodulation module for demodulating data received from the wireless power receiver, wherein the first matching module performs transmission of the wireless power signal and reception of a signal from the wireless power receiver. characterized in that they are performed simultaneously.

The downlink modulation module may perform modulation using frequency shift keying (FSK).

The downlink modulation module may perform dual band frequency shift keying (FSK).

) 및 제2 공진 주파수(

)를 이용하여 변조하며, 제1 공진 주파수는 수학식 1과 같고, 제2 공진 주파수는 수학식 2와 같을 수 있다.The frequency shift keying (FSK) is a first resonant frequency (

) and the second resonant frequency (

), the first resonant frequency may be the same as Equation 1, and the second resonant frequency may be the same as Equation 2.

(Equation 1)

(Equation 2)

The uplink demodulation module may demodulate using an envelope detector or a low pass filter (LPF) and threshold detection.

The downlink modulation module may modulate a frequency by including a switch.

A wireless power receiver according to another embodiment of the present invention for achieving the above object is a wireless power receiver using a single coil, a downlink demodulation module for demodulating a wireless power signal received from a wireless power transmitter, the wireless power A rectifier module for converting wireless power received from a transmission device into direct current, an uplink modulation module for modulating a signal transmitted to the wireless power transmitter, and a receiving coil module, wherein the wireless power transmitter and the wireless power receiver A second matching module for receiving the wireless power signal by matching the resonance frequency and impedance of the device and transmitting the signal modulated by the uplink modulation module to the wireless power transmitter, the second matching module comprising: , It is characterized in that the reception of the wireless power signal and the transmission of the signal to the wireless power transmission device are performed simultaneously.

The uplink modulation module may modulate data using a load shift keying (LSK) method.

The second matching module may further include a lumped inductor (L) and a capacitor (C) capable of transmitting and receiving a frequency shift modulated signal of the wireless power transmitter.

A wireless power transmitter and a wireless power receiver according to another embodiment of the present invention for achieving the above object are included, and the wireless power transmitter transmits/receives wireless power and data and the wireless power receiver simultaneously transmits and receives data. A wireless power and bidirectional data transmission and reception device using a single coil for transmitting and receiving wireless power, the wireless power transmission device comprising: a downlink modulation module for modulating a wireless power signal, a power amplification module for amplifying power of the modulated wireless power signal, and a transmission coil module A first matching module for transmitting the amplified wireless power signal by matching resonance frequencies and impedances of the wireless power transmitter and the wireless power receiver, and receiving a signal from the wireless power receiver, and the wireless An uplink demodulation module demodulating data received from a power receiver, wherein the wireless power receiver is a wireless power receiver using a single coil, and demodulates a wireless power signal received from a wireless power transmitter. A link demodulation module, a rectification module for converting wireless power received from the wireless power transmitter into direct current, an uplink modulation module for modulating a signal sent to the wireless power transmitter, and a receiving coil module, wherein the wireless power A second matching module for receiving the wireless power signal by matching the resonance frequency and impedance of the transmitting device and the wireless power receiving device, and transmitting the signal modulated by the uplink modulation module to the wireless power transmitting device. do.

The downlink modulation module may perform modulation using frequency shift keying (FSK).

The downlink modulation module may perform dual band frequency shift keying (FSK).

) 및 제2 공진 주파수(

)를 이용하여 변조하며, 제1 공진 주파수는 수학식 1과 같고, 제2 공진 주파수는 수학식 2와 같을 수 있다. The downlink modulation module has a first resonant frequency (for frequency shift keying (FSK))

) and the second resonant frequency (

), the first resonant frequency may be the same as Equation 1, and the second resonant frequency may be the same as Equation 2.

The uplink demodulation module may demodulate using an envelope detector or a low pass filter (LPF) and threshold detection.

The downlink modulation module may modulate a frequency using a switch.

The uplink modulation module may modulate data using a load shift keying (LSK) method.

The second matching module may further include a lumped inductor (L) and a capacitor (C) capable of transmitting and receiving a frequency shift modulated signal of the wireless power transmitter.

The present invention enables wireless power transmission and bi-directional data transmission and reception to be simultaneously performed, so that compared to the case of transmitting and receiving data through the existing time-division method, there is an advantage in that data can be transmitted and received without the need for a separate protocol for time-division data transmission and reception. .

In addition, the present invention enables wireless power transmission and bi-directional data transmission and reception to be simultaneously performed, compared to the case of data communication through the existing time-division method, there is no need to provide an additional memory for temporarily storing data, and thus wireless power transmission and bi-directional data communication are not required. There is an advantage in that the data transmission/reception device can be miniaturized.

In addition, the present invention has the advantage of miniaturizing the device by simultaneously performing wireless power and bi-directional data transmission and reception using a single coil without using an additional coil or antenna.

In addition, according to the present invention, by performing frequency shift modulation using two resonance points, it is possible to maintain high efficiency of radio power transmission even during data transmission and reception.

1 is a block diagram of an apparatus for transmitting and receiving wireless power and bi-directional data using a single coil according to an embodiment of the present invention.
2A is a block diagram illustrating wireless power and bi-directional data transmission according to an embodiment of the present invention.
2B is a diagram showing wireless power and downlink data transmission according to an embodiment of the present invention.
2C is a diagram showing uplink data transmission according to an embodiment of the present invention.
3 is a diagram showing main waveforms of wireless power and full-duplex data transmission according to an embodiment of the present invention.
4 is a diagram showing a device fabricated for a performance test according to an embodiment of the present invention.
5 is a diagram showing test results according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term “and/or” includes any combination of a plurality of related listed items or any of a plurality of related listed items.

In embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”. Also, in the embodiments of the present application, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B”.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate overall understanding in the description of the present invention, the same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

1 is a block diagram of a wireless power transmitter 100 and a wireless power receiver 200 according to an embodiment of the present invention.

Referring to FIG. 1 , the wireless power transmitter 100 may be a device that simultaneously transmits required power and data wirelessly to the wireless power receiver 200 .

The wireless power receiver 200 may be a device capable of receiving power wirelessly from the wireless power transmitter 100 and operating. In view of the characteristics of the present invention, the wireless power receiver 200 is applied to a device requiring a miniaturized wireless power receiver 200, such as a device inserted into the body or a device used for Near Field Communication (NFC). However, it is not limited thereto, and may be applied to various devices such as mobile communication terminals or multimedia devices.

Meanwhile, the wireless power transmitter 100 may wirelessly transfer power to the wireless power receiver 200 without mutual contact by using an inductive coupling method based on a magnetic induction phenomenon.

The wireless power transmission by the inductive coupling method is a technology for wirelessly transmitting power using a primary coil and a secondary coil, and a current is induced toward the other coil through a magnetic field that changes in one coil by a magnetic induction phenomenon, thereby generating power that is conveyed

Referring to FIG. 1, the wireless power transmitter 100 includes a control module 101, a downlink modulation module 103, a power amplification module 105, a first matching module 107, and an uplink demodulation module ( 109) are included.

The control module 101 includes components of the wireless power transmitter 100, such as a downlink modulation module 103, a power amplification module 105, a first matching module 107, and an uplink demodulation module 109. Control. In addition, the control module 101 may be implemented to be integrated with another control module (not shown) that controls the wireless power transmitter 100 . The control module 101 may receive a power control message from the wireless power receiver 200 . The control module 101 may determine one or more characteristics of frequency, voltage, and current based on the received power control message.

The downlink modulation module 103 may modulate a signal under the control of the control module 101 . The downlink modulation module 103 may perform frequency shift keying modulation (FSK) modulation. The downlink modulation module 103 may be composed of a resistive element whose resistance changes with respect to direct current, and may be composed of a capacitive element whose reactance changes with respect to alternating current.

The power amplification module 105 may amplify the modulated signal to a preset level.

The first matching module 107 may transmit the amplified signal received from the power amplification module 105 through the transmission coil module by matching the resonant frequency and impedance. The first matching module 107 may further include a transmitting coil module. The transmit coil module may transmit the modulated signal and wireless power to the wireless power receiver 200 .

The uplink demodulation module 109 may receive and demodulate a signal modulated and transmitted by the wireless power receiver 200 through the uplink modulation module 209. The uplink demodulation module 109 may be composed of a resistive element whose resistance changes with respect to DC current, and may be composed of a capacitive element whose reactance changes with respect to AC current.

Referring back to FIG. 1, the wireless power receiver 200 includes a second matching module 203, a downlink demodulation module 201, a rectification module 205, an uplink modulation module 209, and a load module 207. ) may be included.

The second matching module 203 may transmit the modulated signal received from the uplink modulation module 209 to the wireless power transmitter 100 through the receiving coil module by matching the resonant frequency and impedance. The second matching module 203 may further include a receiving coil module. The receiving coil module may receive a modulated signal and wireless power transmitted through the transmitting coil module of the wireless power transmitter 100 .

The downlink demodulation module 201 may demodulate the modulated signal received from the wireless power transmitter 100. The downlink demodulation module 201 may be composed of a resistive element whose resistance changes with respect to direct current, and may be composed of a capacitive element whose reactance changes with respect to alternating current.

The rectification module 205 may rectify the wireless power received from the wireless power transmitter 100, convert it into direct current, and deliver it to the load module 207. The rectification module 205 may further include a regulator that converts the rectified current into a more stable direct current.

The load module 207 transmits the power received from the rectification module 205 to the second matching module 203 through the uplink modulation module 209 to transmit the signal of the wireless power receiver 200. can do. The load module 207 may transfer remaining power to a power storage (not shown) connected to the wireless power receiver 200 .

The uplink modulation module 209 may receive the signal transmitted from the load module 207, perform modulation, and transmit the modulated signal to the second matching module 203. The uplink modulation module 209 may be composed of a resistive element whose resistance changes with respect to direct current, and may be composed of a capacitive element whose reactance changes with respect to alternating current.

2A is a block diagram showing transmission and reception of wireless power and bi-directional data according to an embodiment of the present invention, FIG. 2B is a diagram showing transmission and reception of wireless power and downlink data according to an embodiment of the present invention, and FIG. It is a diagram showing uplink data transmission and reception according to an embodiment of the present invention.

The wireless power transmitter 100 may transmit data together with wireless power. The wireless power transmitter 100 may use dual band frequency shift keying (FSK) for data transmission.

Compared to the existing single band frequency shift keying (FSK) method, when using the dual band frequency shift keying (FSK) method, wireless power transmission and data with a higher quality factor (Q) transmission can be performed.

Here, the quality factor represents the sharpness of the resonance curve, that is, the frequency response, and is a value determined by the relative size of the maximum energy that can be accumulated in the resonance circuit and the energy dissipated within a period. do.

및

를 포함할 수 있다. 상기 무선 전력 수신 장치(200)는 럼프드(lumped)

및

를 사용하여, 이중 대역(Dual Band) 통신이 가능하게 할 수 있으며, 이를 통하여 주파수 편이 변조(FSK) 데이터 전송시에도 높은 효율의 무선 전력 전송 채널을 유지할 수 있다. 이중 대역(Dual Band) 코일의 최적화를 위한 인덕턴스와 캐패시턴스는 수학식 1 내지 수학식 3과 같을 수 있다.Referring to FIGS. 2A to 2C , the power amplification module 105 may include a resonant capacitor and a switch. The wireless power transmitter 100 may generate a first frequency and a second frequency using the resonant capacitor and the switch. Here, the wireless power receiver 200 with space limitations, such as an implantable medical device (IMD), is lumped

and

can include The wireless power receiver 200 is lumped

and

By using, dual band communication can be enabled, and through this, a wireless power transmission channel with high efficiency can be maintained even during frequency shift keying (FSK) data transmission. Inductance and capacitance for optimization of the dual band coil may be as shown in Equations 1 to 3.

Here, frequency shift keying (FSK) is a frequency modulation method used when transmitting a digital signal through an analog transmission line. In frequency shift keying (FSK), binary numbers 1 and 0 may correspond to two frequencies, a high frequency and a low frequency with a center frequency inserted therein.

)와 스위치를 사용하여 제1 주파수(

) 및 제2 주파수(

)의 두 개의 주파수를 생성 할 수 있다. 한편, 상기 무선 전력 수신 장치(200)와 달리 상기 무선 전력 전송 장치(100)는 일반적으로 공간적인 제약이 크지 않은 경우가 대다수이므로, 무선 전력 전송 장치(100)는 이에 국한되지 않고, 두개의 공진 주파수를 생성하여 주파수 편이 변조(FSK)를 구현할 수 있는 다양한 방식이 적용될 수 있다.According to one embodiment of the present invention, the wireless power transmitter 100 includes an additional resonance capacitor (

) and the switch to use the first frequency (

) and the second frequency (

) can generate two frequencies. On the other hand, unlike the wireless power receiver 200, since the wireless power transmitter 100 generally does not have a large spatial restriction, the wireless power transmitter 100 is not limited to this, and the two resonance Various schemes capable of implementing frequency shift keying (FSK) by generating frequencies may be applied.

2A and 2C, the wireless power receiver 200 applies load shift keying (LSK) to an uplink that transmits data to the wireless power transmitter 100. can

In the field of implantable medical devices (IMD), utilization of load shift keying (LSK) can be very high due to relatively low power consumption and simple circuit implementation. In particular, the power supply method by inductive coupling has always been controversial about harmfulness to the human body due to exposure to electromagnetic waves, so implantable medical devices (IMD) use load shift modulation (LSK) as a method of transmitting power only during stimulation time. It is advantageous to use the method In addition, the load shift keying (LSK) method transmits data from the wireless power receiver 200 to the wireless power transmitter 100 by changing only a load state without a separate transmission circuit in the wireless power receiver 200. There are possible advantages to this.

) 및 제2 주파수(

), 두 개의 독립적인 주파수를 사용하게 됨으로써, 반사 저항을 이용하는 부하 편이 변조(LSK)를 활용하여 노이즈가 적은 상향 링크를 구현할 수 있다. 이를 통하여, 기존의 좁은 데이터 전송 영역과 낮은 Quality Factor(Q)로 인하여 동일 대역(Single Band)의 주파수 편이 변조(FSK)를 사용하는 하향 링크(downlink) 시스템에서, 양방향 통신을 위해 상향 링크(Uplink)로 부하 편이 변조(LSK)를 사용하는 경우에 발생하였던 노이즈에 매우 취약한 문제점을 해결할 수 있다.Referring to FIG. 2C, the wireless power transmitter 100 according to the present invention has a first frequency (dual band) due to a coil module.

) and the second frequency (

), by using two independent frequencies, it is possible to implement an uplink with less noise by utilizing load shift keying (LSK) using reflection resistance. Through this, in a downlink system using frequency shift keying (FSK) of the same band (Single Band) due to the existing narrow data transmission area and low quality factor (Q), uplink (Uplink) for two-way communication ), it is possible to solve the problem of being very vulnerable to noise that occurred when load shift keying (LSK) was used.

Meanwhile, in the case of data transmission through uplink using conventional load shift keying (LSK), self-interference generated during load shift keying (LSK) operates as a time-varying channel for the wireless power receiver 200, There is a problem in that a frequency response of a received downlink frequency shift keying (FSK) signal may be distorted.

However, the present invention solves the above problem by minimizing the distortion of the frequency response by using dual band frequency shift keying (FSK) that is robust against self-interference when transmitting data in a full duplex (FD) method. .

3 conceptually illustrates the main waveforms of the proposed wireless power and full-duplex (FD) method data transmission.

은 상기 무선 전력 전송 장치(100)에서 상기 무선 전력 수신 장치(200)로 송신하는 데이터이고,

은 상기 무선 전력 전송 장치(100)로부터 송신되어 상기 무선 전력 수신 장치(200)에서 수신된 데이터를 의미한다. 또한,

은 상기 무선 전력 수신 장치(200)에서 상기 무선 전력 전송 장치(100)로 송신된 데이터를 의미하고,

는 상기 전력 수신 장치로부터 송신되어 상기 무선 전력 전송 장치(100)가 수신한 데이터를 의미할 수 있다.In Figure 3,

is data transmitted from the wireless power transmitter 100 to the wireless power receiver 200,

denotes data transmitted from the wireless power transmitter 100 and received by the wireless power receiver 200. also,

denotes data transmitted from the wireless power receiver 200 to the wireless power transmitter 100,

may mean data transmitted from the power receiver and received by the wireless power transmitter 100.

은 상기 무선 전력 전송 장치(100)의 상기 하향 링크 변조 모듈(103)에 의해 변조되고, 상기 전력 증폭 모듈(105)을 통해 전력이 증폭된 후, 제1 매칭 모듈(107)을 통해 상기 무선 전력 수신 장치(200)로 수신될 수 있다. 상기 수신된

은 상기 하향 링크 복조 모듈(201)을 통해 복조되어, 상기 무선 전력 수신 장치(200)에

로 수신 될 수 있다. remind

is modulated by the downlink modulation module 103 of the wireless power transmitter 100, and after power is amplified through the power amplification module 105, the wireless power through the first matching module 107 It may be received by the receiving device 200. the received

is demodulated through the downlink demodulation module 201 and sent to the wireless power receiver 200.

can be received as

은 상기 무선 전력 수신 장치(200)의 상기 상향 링크 변조 모듈(209)을 통해 변조되어 제2 매칭 모듈(203)을 통해 상기 무선 전력 전송 장치(100)로 전송될 수 있고, 상기 전달된

은 상기 상향 링크 복조 모듈(109)을 통해 복조되어,

으로 상시 무선 전력 전송 장치(100)에 정보를 전달 할 수 있다. 여기서, 상기 무선 전력의 진폭은

에 따라서 변화하는 상기 무선 전력 수신 장치(200)의 반사 저항에 따라 동시에 변조될 수 있다. 또한, 상기 무선 전력 전송 장치(100)는 로우 패스 필터(LOW PASS FILTER, LPF)와 임계값 감지(Threshold detection)에 의해서 진폭 변조된 부하 편이 변조(LSK) 데이터를 복조 할 수 있다. 뿐만 아니라, 상기 무선 전력 전송 장치는 포락선 검파기(Envelope Detector)를 사용하여 진폭 변조된 부하 편이 변조(LSK) 데이터를 복조 할 수 도 있다. 여기서, 상기 포락선 검파기는 정류 특성을 갖는 다이오드 및 로우 패스 필터(LPF)를 결합된 다이오드 검파기로써, 매우 저렴하게 구현 가능한 장점이 있다. 상기 무선 전력 수신 장치(200)는 캐리어 주파수의 주파수를 측정하여 주파수 편이 변조(FSK) 데이터를 복조 할 수 있다.Also, the above

may be modulated through the uplink modulation module 209 of the wireless power receiver 200 and transmitted to the wireless power transmitter 100 through the second matching module 203, and

Is demodulated through the uplink demodulation module 109,

Information can be delivered to the wireless power transmitter 100 at all times. Here, the amplitude of the wireless power is

It can be simultaneously modulated according to the reflection resistance of the wireless power receiver 200, which changes according to . In addition, the wireless power transmitter 100 may demodulate load shift keying (LSK) data amplitude modulated by a low pass filter (LPF) and threshold detection. In addition, the wireless power transmitter may demodulate amplitude-modulated load shift keying (LSK) data using an envelope detector. Here, the envelope detector is a diode detector in which a diode having rectification characteristics and a low pass filter (LPF) are combined, and has the advantage of being implemented very inexpensively. The wireless power receiver 200 may demodulate frequency shift keying (FSK) data by measuring a frequency of a carrier frequency.

Referring to Figure 3, the frequency and amplitude of the modulated signal is changing. In the case of a frequency component, it changes according to frequency shift keying (FSK), and 1 corresponds to a large frequency, and 0 can correspond to a small frequency. In addition, in the case of the amplitude component, it changes according to the load shift keying (LSK), and corresponds to 0 if it is less than the threshold value by the low pass filter (LPF) and threshold detection It shows that it corresponds to 1 if it is above the threshold.

4 is a view showing a device manufactured for a performance test according to an embodiment of the present invention, and FIG. 5 is a view showing a test result according to an embodiment of the present invention.

)으로 설계되었다. 또한, 상기 무선 전력 전송 장치(100) 및 무선 전력 수신 장치(200)의 송, 수신 코일이 모두 무선 전력 주파수인 2 MHz 및 4 MHz에서 공진할 수 있도록, 상기 무선 전력 전송 장치(100)는 스위치 형태의 최적화된 전력 증폭 모듈(105)(Power Amplifier)를 포함하고 있다. 4 shows a prototype manufactured for performance testing. In the case of the prototype, the transmitting coil of the wireless power transmitter is a 2-layer Printed Circuit Board (PCB) coil of Q = 87 and 14 turns having a diameter of 3.5 cm, and the receiving coil of the wireless power receiver 200 is a 2-layer PCB coil of Q = 60 and 12-turn with a diameter of 2.0 cm. Here, the distance between the two coils is 1 cm and the load resistance of the wireless power receiver 200 is 170 ohms (

) was designed. In addition, the wireless power transmitter 100 has a switch so that both the transmitting and receiving coils of the wireless power transmitter 100 and the wireless power receiver 200 can resonate at 2 MHz and 4 MHz, which are wireless power frequencies. It includes an optimized power amplification module 105 (Power Amplifier) of the form.

및

를 사용하여 2 MHz 와 4 MHz 두 개의 공진점을 갖도록 제작되었다. 또한, 상기 무선 전력 수신 장치(200)의 정류기는 두 개의 다이오드를 이용하여 배전압 정류 회로(voltage doubler) 형태로 제작되었다.In addition, referring to the graph included in FIG. 4, the receiving coil of the wireless power receiver 200 is lumped for dual band communication.

and

It was manufactured to have two resonance points of 2 MHz and 4 MHz using . In addition, the rectifier of the wireless power receiver 200 is manufactured in the form of a voltage doubler using two diodes.

Referring to FIG. 5, the measured waveform of the prototype manufactured as shown in FIG. 4 is shown. It can be confirmed that the wireless power receiver can receive wireless power of 140 mW at a distance of 1 cm and successfully perform two-way communication between transceivers. The wireless power transmission efficiency was measured at 14% DC-to-DC, and the downlink data transmission rate was measured at 800 kbps and the uplink data transmission rate was measured at 14 kbps, respectively.

The present invention can simultaneously perform wireless power and two-way data communication using a single coil, so there is no need to provide a communication protocol required for a half-duplex method such as time division and a memory capable of temporarily storing data, and thus an implantable medical device. Utilization may be high in miniaturized devices such as (IMD) or Near Field Communication (NFC) chips.

In particular, the present invention uses load shift keying (LSK) for uplink, when applied to an implantable medical device (IMD), which is subject to controversy about harmfulness to the human body due to exposure to electromagnetic waves, There is an advantage that can be applied to a method of transmitting power only during the stimulation time. In addition, the present invention solves the problem of magnetic interference when load shift keying (LSK) is used using a conventional single coil by performing frequency shift keying (FSK) using two resonance points, and wireless power transmission It has the advantage of being able to maintain data transfer efficiency even during operation.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

100 wireless power transfer device
101 control module
103 downlink modulation module
105 power amplification module
107 first matching module
109 uplink demodulation module
200 wireless power receiving device
201 downlink demodulation module
203 second matching module
205 rectification module
207 load module
209 uplink modulation module

Claims (9)

A wireless power transmission device using a single coil,
a downlink modulation module for modulating a wireless power signal;
a power amplification module that amplifies power of the modulated wireless power signal;
A first matching that includes a transmission coil module, transmits the amplified wireless power signal by matching resonance frequencies and impedances of the wireless power transmitter and wireless power receiver, and receives the signal transmitted from the wireless power receiver. module; and
An uplink demodulation module for demodulating data received from the wireless power receiver,
The first matching module,
Characterized in that transmission of wireless power to the wireless power receiver and bi-directional data transmission and reception with the wireless power receiver are performed simultaneously.
Wireless power transfer device. The method of claim 1,
Characterized in that the downlink modulation module modulates using frequency shift keying (FSK),
Wireless power transfer device. The method of claim 2,
Characterized in that the downlink modulation module performs dual band frequency shift keying (FSK),
Wireless power transfer device. The method of claim 3,
The frequency shift keying (FSK) is a first resonant frequency (

) and the second resonant frequency (

) is used to modulate,
Characterized in that the first resonant frequency is equal to Equation 1 and the second resonant frequency is equal to Equation 2,
Wireless power and two-way data transfer device.
(Equation 1)

(Equation 2)

The method of claim 2,
Characterized in that the uplink demodulation module demodulates using an envelope detector or a low pass filter (LPF) and threshold detection,
Wireless power transfer device. The method of claim 3,
Characterized in that the downlink modulation module modulates the frequency by including a switch,
Wireless power transfer device. A wireless power receiving device using a single coil,
a downlink demodulation module for demodulating the wireless power transmission signal modulated and received from the wireless power transmission device;
a rectifier module for converting the wireless power received from the wireless power transmitter into direct current;
an uplink modulation module for modulating a signal transmitted to the wireless power transmitter; and
A receiving coil module is included to receive the wireless power transmission signal by matching resonance frequencies and impedances of the wireless power transmitter and the wireless power receiver, and transmit the signal modulated by the uplink modulation module to the wireless power transmission A second matching module for transmitting to the device; includes,
The second matching module,
Characterized in that simultaneous reception of wireless power transmitted from the wireless power transmitter and bi-directional data transmission and reception with the wireless power transmitter,
A wireless power receiving device. The method of claim 7,
Characterized in that the uplink modulation module modulates data using a load shift keying (LSK) method.
A wireless power receiving device. The method of claim 8,
The second matching module further includes a lumped inductor (L) and a capacitor (C) capable of transmitting and receiving a frequency shift modulated signal of the wireless power transmitter,
A wireless power receiving device.

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