KR20120069496A - Apparatus and method for trasmitting energy - Google Patents

Abstract

에 따라 전원을 공급하는 전원부; 상기 공급된 전원을 전달받아 자기장 에너지를 발생시켜 에너지 소비 장치에 전달하는 송신부; 상기 송신부의 전압-전류간 위상

를 측정하는 측정부;를 포함하고, 상기

는 상기 측정된 위상

에 따라 조절되도록 한다. 따라서, 환경 변화등으로 공진 주파수가 변경되더라도 전원부의 주파수만을 조절하여 에너지 전달 효율을 높일 수 있다.The present invention relates to an apparatus and a method for delivering wireless electromagnetic energy, the predetermined frequency

A power supply for supplying power according to the; A transmitter configured to receive the supplied power to generate magnetic field energy and transmit the generated field energy to an energy consuming device; Phase between the voltage and current of the transmitter

It includes; Measuring unit, including;

Is the measured phase

To be adjusted accordingly. Therefore, even if the resonance frequency is changed due to environmental changes, the energy transfer efficiency can be improved by adjusting only the frequency of the power supply unit.

Description

Apparatus and method for energy delivery {APPARATUS AND METHOD FOR TRASMITTING ENERGY}

The present invention relates to an energy delivery device and a method, and more particularly, to an energy delivery device and a method for increasing energy transfer efficiency by re-adjusting a resonance frequency by using a phase difference measured at a transmitter even when a resonance frequency is changed.

Almost all home appliances, portable and office and industrial devices used in everyday life use electrical energy supplied by wires from power plants. Until now, power supply by wire has not been felt uncomfortable, but recent development and widespread use of various mobile devices has shown that wired power supply is not a suitable power supply source for mobile devices. For example, as mentioned above, when the battery is powered by a battery, a function of the mobile device for a battery having a constant charging capacity may increase the recharging cycle, and to increase the capacity of the mobile device to compensate for it. The weight increases, which reduces the portability. In addition, mobile phones, which are now a necessity for everyday life, also have a problem that it is difficult to charge anywhere easily when the battery is exhausted. In addition, as the use of laptop computers increases, the problem of power supply is becoming more prominent.

Wireless power transmission or wireless energy transfer, which wirelessly transfers electrical energy from a power source to a desired device, began to use electric motors or transformers using electromagnetic induction principles in the 1800s, and then radio A method of transmitting electrical energy by radiating electromagnetic waves such as waves and lasers has also been attempted. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction. There are the following types of energy transfer methods by the wireless method.

First, there is an electromagnetic induction method by magnetic induction method. Magnetic induction, which induces current through a magnetic field from one coil to another, has limited conditions where the relative position, distance, and load power of both coils must be accurate. Recently, however, several companies have begun to introduce new wireless charging products that can charge mobile phones, PDAs, MP3 players, and even notebook computers using electromagnetic induction.

Second, there is a non-radioactive radio transmission technology using the near field effect. The technique is based on evanescent wave coupling, where electromagnetic waves travel from one medium to another through a near electromagnetic field when two media resonate at the same frequency. When a charging station connected to a power source forms this field and approaches a portable device with a receiver designed with the same resonant frequency in the MHz band within this field, a form of energy tunnel is created between the two mediums, allowing a portable device that is several meters away. Can be charged. In particular, since this energy is "non-radiative" and based on a magnetic field, it is transferred directly to the device only when there is a device with a resonant frequency, and the unused portion is reabsorbed by the electromagnetic field instead of spreading into the air. Unlike other electromagnetic waves, it does not affect other machines or bodies around.

Third, there is a long-distance transmission technology using short-wavelength radio frequency in the electromagnetic range. This method is an electromagnetic radiation method using a microwave in the 2.45 or 5.8 GHz band has a fatal disadvantage.

The wireless power technology proposed by the present invention is the second method, and generally has the configuration of FIG. 1 as a wireless power transmission apparatus using a magnetic field resonator. The electric power generated by the AC signal generator 10 generates a magnetic field in a manner in which a magnetic field is generated by the transmitting coil 21 and energy is transmitted to the transmitting resonant coil 22 to cause resonance in the transmitting resonant coil 22. Amplify. The amplified magnetic field can transfer energy farther than conventional magnetic field induction power transmission. Similarly, the receiving resonant coil 31 serves to amplify the transmitted magnetic field and to efficiently receive energy. As a result, energy can be transmitted efficiently over long distances.

On the other hand, in the magnetic field resonance method, when the object 50 is present in the environment or in the energy transfer path, the resonance frequencies of the transmission and reception resonant coils 12 and 20 may be changed. In this case, the energy amplification rate is reduced to affect the energy transfer efficiency at a predetermined distance.

The present invention proposes a method of adjusting the frequency of the AC signal generator to maintain the transmission efficiency of energy by detecting a change in the resonance frequency in order to solve the above problems.

The present invention proposes a method for detecting a change in the resonant frequency of the resonant coil.

에 따라 전원을 공급하는 전원부; 상기 공급된 전원을 전달받아 자기장 에너지를 발생시켜 에너지 소비 장치에 전달하는 송신부; 상기 송신부의 전압-전류간 위상

를 측정하는 측정부;를 포함하고, 상기

는 상기 측정된 위상

에 따라 조절되도록 한다.Apparatus for transmitting electromagnetic energy according to the present invention, a predetermined frequency

A power supply for supplying power according to the; A transmitter configured to receive the supplied power to generate magnetic field energy and transmit the generated field energy to an energy consuming device; Phase between the voltage and current of the transmitter

It includes; Measuring unit, including;

Is the measured phase

To be adjusted accordingly.

에 따라 전원을 공급하는 단계; 송신부가 상기 공급된 전원을 전달받아 자기장 에너지를 발생시켜 에너지 소비 장치에 전달하는 송신 단계; 상기 송신부의 전압-전류간 위상

를 측정하는 측정 단계; 및 상기

를 상기 측정된 위상

에 따라 조절하는 단계를 포함한다.Method for delivering electromagnetic energy according to the present invention, a predetermined frequency

Supplying power according to; A transmitting step of receiving, by a transmitter, the supplied power to generate magnetic field energy and transmitting the generated field energy to an energy consuming device; Phase between the voltage and current of the transmitter

Measuring step of measuring; And

The measured phase

And adjusting according to the.

According to the present invention it is possible to compensate for the influence of the resonance frequency in accordance with the change of the external environment to ensure a stable energy transfer.

1 shows a schematic diagram of a configuration for the present conventional wireless energy transfer scheme.
Figure 2 shows a block diagram of the configuration of a wireless energy transfer device according to an embodiment of the present invention.
Figure 3 shows a block diagram of the configuration of a wireless energy transfer device according to an embodiment of the present invention.
4 is a block diagram of a simplified configuration of a wireless energy transfer device according to an embodiment of the present invention.
5 is a flow chart of a wireless energy transfer method according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

The suffix "module" and " part "for components used in the following description are given merely for ease of description, and the" module "and" part "

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention, but these may vary depending on the intention or custom of a person skilled in the art or the emergence of new technologies. In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in the corresponding description of the invention. Therefore, it is intended that the terminology used herein should be interpreted based on the meaning of the term rather than on the name of the term, and on the entire contents of the specification.

1 is a block diagram of a configuration of a wireless energy transfer apparatus according to an embodiment of the present invention.

에 따른 교류 전원을 발생할 수 있다. 소정 주파수

는 디폴트 주파수

를 가질 수 있다. 디폴트 주파수

는 어떠한 간섭 대상(50)도 없는 상태에서의 공진 주파수일 수 있다. 또는, 디폴트 주파수

는 타겟 대상의 에너지 소비 장치(40)를 도 1에서와 같이 장착하였을 때의 이상적(ideal) 공진 주파수일 수 있다. 소정 주파수

는 주기적으로, 또는 외부 요인에 의해 변경될 수 있고 또는 임의적으로 조절될 수 있다.Referring to FIG. 1, the wireless energy transfer apparatus 100 according to an embodiment of the present invention may include a power supply unit 10. The power supply unit 10 has a predetermined frequency

Can generate AC power. Predetermined frequency

Is the default frequency

It can have Default frequency

May be the resonant frequency in the absence of any interference object 50. Or default frequency

May be an ideal resonance frequency when the energy consumption device 40 of the target object is mounted as shown in FIG. 1. Predetermined frequency

Can be changed periodically or by external factors or can be arbitrarily adjusted.

Wireless energy delivery apparatus 100 according to an embodiment of the present invention may include a transmitter 20. The transmitting unit 20 may include a transmitting coil 21 and a transmitting resonant coil 22. When a magnetic field is generated in the transmitting coil 21, energy is transmitted to the transmitting resonant coil 22. The magnetic field can be amplified in such a way as to cause resonance in the transmitting resonant coil 22. The amplified magnetic field may be transmitted to the receiver 30 through the space.

Wireless energy delivery apparatus 100 according to an embodiment of the present invention may include a receiver 30. The receiver 30 receives the amplified magnetic field from the receiving resonant coil 31 and amplifies the magnetic field in the same manner as that of the transmitter 20, and transmits the magnetic field to the energy consuming device 40 via the receiving coil 32. You can.

에 따른 전원이 발생되면, 디폴트 주파수

의 전원에 따라 공진이 발생되고, 이후 증폭되어 에너지 소비 장치(40)에 전달될 수 있다. 그러나, 주위 환경 변화나 송신부(20) 또는 수신부(30)에서의 에너지 전달 경로 상에 변화가 생기면 공진 주파수는 디폴트 주파수

와 달라질 수 있다. 이때, 공진 주파수의 변화를 감지하여 전원부(10)의 주파수를 조절할 수 있다.On the other hand, in the state that the magnetic field is not affected by the interference target 50, the power supply unit 10 default frequency

Default power frequency

The resonance may be generated according to the power of the power amplifier, and then amplified and transferred to the energy consuming device 40. However, if there is a change in the surrounding environment or a change in the energy transmission path in the transmitter 20 or the receiver 30, the resonance frequency is the default frequency.

And may vary. In this case, the frequency of the power supply unit 10 may be adjusted by detecting a change in the resonance frequency.

The wireless energy delivery device 100 according to the present invention may further include a measurement unit (not shown) for detecting a change in the resonance frequency.

2 is a configuration circuit diagram of a wireless energy transfer device according to an embodiment of the present invention. Referring to FIG. 3, the transmitting coil 21 may include a coil having a self inductance L1. The transmission coil 21 may receive power from the power supply unit 10 to generate a magnetic field and transmit the magnetic field to the transmission resonant coil 22 having mutual inductance M1. The magnetic field amplified by the resonant coil 22 for transmission may be transmitted in space. Thereafter, the magnetic field may be transmitted to the receiver 30 having the mutual inductance M2 and then to the energy consuming device 40 having the resistance R.

In addition, the energy delivery device 100 according to the present invention may measure the phase difference between the voltage and the current of the transmitter. In order to measure the phase difference between the voltage and current input to the transmitting coil 21, a measuring unit may be mounted between the a-a` terminals of the transmitting coil 21 to measure the phase difference.

The measurement unit may measure an input voltage and an external voltage to measure a phase difference.

Figure 3 shows a block diagram of the configuration of a wireless energy transfer device according to another embodiment of the present invention. In FIG. 1 and FIG. 2, an energy delivery device including one transmitter and a receiver is illustrated. Referring to FIG. 3, two or more receiving units may be sequentially delivered to thereby transfer energy. In detail, the magnetic field energy generated and amplified by the transmitter 25 may be transmitted to the energy consuming device 40 via the receiver 1 35 and the receiver 2 45. Even in this case, the measurement unit may obtain the phase difference between the voltage and the current from the input terminal of the transmitter 25. That is, the measured resonant frequency can be measured simply by measuring the phase difference at the input of the transmitter irrespective of the number, shape of the receiver, or the configuration or the number of the energy consuming devices.

4 is a circuit diagram of a simplified configuration of a wireless energy transfer device according to an embodiment of the present invention. 4 is a circuit equivalent to the circuit illustrated in FIG. 2. That is, on the overall system, the power supply, transmitter, receiver and energy consuming device of FIGS. 1 and 2 may be equivalent as the parallel circuit of FIG. On the equivalent circuit illustrated in FIG. 4, the aa ′ stage is the same as the input end of the transmitting coil 20, the total input resistance of the system measured at the input of the transmitting coil is Ra, and the total input inductance is La, The total input capacitance has Ca.

When resonance occurs in the entire system illustrated in FIG. 4, since the total impedance value of the system remains only a real component, the phase difference between voltage and current measured at a-a` is 0. However, as described with reference to FIG. 1, the overall inductance of the system may be changed due to the influence of the external environment, etc. In this case, the total impedance value of the circuit of FIG. 4 may be changed. The measured phase-to-current phase difference results in imaginary components as well as real. In other words, the total impedance includes both resistor and reactance.

The overall admittance Y (1 / Z) of the system is

Becomes a complex expression

This can be The phase of the admittance Y is the inversion value of the phase difference between the voltage and the current viewed from the transmitter, and when the phase difference θ _{a is} obtained,

를 구해보면, frequency

If you get,

That is, if the frequency of the power supply unit 10 is readjusted as the frequency obtained from Equation 5, the entire system may resonate again.

Although FIG. 4 illustrates an equivalent circuit of the entire system as a parallel circuit, the present invention is not limited thereto and may be equivalent to a series circuit. The power supply unit 10 may re-adjust the frequency every predetermined period or when the resonance frequency is changed due to an external environment change or the like, or by a user input.

5 is a flow chart of a wireless energy transfer method according to an embodiment of the present invention.

In step S11, the power supply unit generates AC power at a predetermined frequency ω ₀ .

In step S12, the energy delivery device according to an embodiment of the present invention generates a magnetic field by using the generated AC power and delivers it to the energy consuming device. Delivery to the energy consuming device can be via a transmitter, a receiver, and the like.

In step S13, the transmitter measures the phase difference between the voltage and the current. The phase difference may be measured at the input of the transmitter.

In step S14, it is determined whether the resonance frequency is changed based on the measured phase difference. It is determined whether the measured phase has a phase greater than zero, that is, if the overall impedance of the system is changed so that the impedance includes reactance values.

As another example, it may be determined whether the resonance frequency is changed by determining whether the measured phase is greater than a predetermined phase difference threshold. When the predetermined phase difference threshold value is within, for example, -0.1 radian to +0.1 radian, it may be determined that the resonance frequency is not changed. If the resonant frequency is not changed, the power supply unit maintains the predetermined frequency ω ₀ without readjusting or changing the frequency.

를 소정 주파수 ω₀ 로부터 재조절할 수 있다. If it is determined in step S15 that the resonant frequency has changed, the resonant frequency is based on the measured phase difference.

Can be readjusted from the predetermined frequency ω ₀ .

The energy transmission device and method according to the present invention is not limited to the configuration and method of the embodiments described as described above, but the embodiments are all or part of each of the embodiments is optional so that various modifications can be made. It may be configured in combination.

On the other hand, the energy delivery device and method of the present invention can be implemented as a processor-readable code on a processor-readable recording medium provided in a TV, a computer, a mobile phone, a smartphone, a tablet computer, and the like. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet. . The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

10: power supply
20: transmitter
30: receiver
40: energy consumption device
50: interference target
100: energy delivery device

Claims (12)

In a device for transmitting electromagnetic energy,
Predetermined frequency

A power supply for supplying power according to the;
A transmitter configured to receive the supplied power to generate magnetic field energy and deliver the generated energy to an energy consuming device;
Phase between the voltage and current of the transmitter

It includes; measuring unit for measuring,
remind

Is the measured phase

Energy transfer device to be adjusted according to. The method of claim 1,
And a receiver configured to receive magnetic field energy from the transmitter and transmit the magnetic field energy to the energy consuming device. The method of claim 2,
And a plurality of receiving units. The method of claim 1,
The transmitting unit includes a transmitting coil for generating a magnetic field,
And the measuring unit measures a phase difference between voltage and current input to the transmitting coil. The method of claim 1,
An overall system comprising an energy delivery device and said energy consuming device, said input resistance R, input reactance L, input conductance C measured at an input of said energy delivery device,
Above frequency

Regulated energy delivery device. The method of claim 1,
The energy transfer device is a non-radiactive energy delivery device. In the method of transmitting electromagnetic energy,
Predetermined frequency

Supplying power according to;
A transmitting step of receiving, by a transmitter, the supplied power to generate magnetic field energy and transmitting the generated field energy to an energy consuming device;
Phase between the voltage and current of the transmitter

Measuring step of measuring; And
remind

The measured phase

Energy delivery method comprising the step of adjusting according to. The method of claim 7, wherein
And a receiver receiving magnetic field energy from the transmitter and transmitting the magnetic field energy to the energy consuming device. The method of claim 8,
And a plurality of receiving units. The method of claim 7, wherein
The transmitting unit includes a transmitting coil for generating a magnetic field,
The measuring step is an energy transfer method for measuring the phase difference between the voltage-current input to the transmitting coil. The method of claim 7, wherein
An overall system comprising an energy delivery device and the energy consuming device, the input resistance R, the input reactance L, the input conductance C measured at the input of the energy delivery device,
The frequency

Energy transfer method further comprising the step of adjusting to. The method of claim 7, wherein
The energy transfer method is a non-radiactive energy delivery method.

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