KR101183525B1 - Radio Frequency Energy Harvesting System and Method for Charging Battery of Mobile Devices - Google Patents

Radio Frequency Energy Harvesting System and Method for Charging Battery of Mobile Devices Download PDF

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KR101183525B1
KR101183525B1 KR1020100055263A KR20100055263A KR101183525B1 KR 101183525 B1 KR101183525 B1 KR 101183525B1 KR 1020100055263 A KR1020100055263 A KR 1020100055263A KR 20100055263 A KR20100055263 A KR 20100055263A KR 101183525 B1 KR101183525 B1 KR 101183525B1
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circuit
energy harvesting
stage
output
connected
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KR1020100055263A
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KR20110135507A (en
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정태경
하미드 자바르
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명지대학교 산학협력단
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Abstract

The present invention relates to an RF energy harvesting system and method for charging a battery using a mobile communication RF signals present around the mobile terminal.
According to an aspect of the present invention, an RF energy harvesting system includes an impedance matching circuit for receiving an RF signal of an ambient received through an antenna, and a multistage amplification and rectifying circuit coupled to an output of the impedance matching circuit, wherein the multistage amplification is performed. And a rectifier circuit comprising a clamp circuit having a first capacitor and a reverse diode connected between two input terminals and a peak rectifier having a forward diode and a second capacitor connected between both terminals of the reverse diode. do.

Description

RF energy harvesting system and method for wirelessly charging the battery of a mobile terminal {Radio Frequency Energy Harvesting System and Method for Charging Battery of Mobile Devices}

The present invention relates to an RF energy harvesting system and method, and more particularly, to an RF energy harvesting system and method for charging a battery using a source of communication RF signals that exist around the system such as a mobile terminal.

Many wireless communication devices are able to use various mobile communication services by using electromagnetic waves of various frequency bands radiated in the air. For example, not only portable terminals such as cellular phones, but also mobile communication / wireless internet / radio / TV broadcasting base stations and repeaters, portable Internet base stations and repeaters, satellites, and the like, may include GSM, (W) CDMA, wireless Internet, radio broadcasting, and TV. The RF signal of a predetermined band is used for a service channel such as broadcasting, WIBRO (mobile Internet), DMB, and GPS.

However, although the battery mounted in the portable terminal such as a cellular phone varies depending on the service usage time, the amount of charge or energy charged within a predetermined time, for example, one or two days, is consumed, and thus, the battery should be recharged and used. The user may recharge the battery by placing the terminal on the charging cradle or by connecting a power converter connected to the power outlet to the terminal by wire.

However, in order to eliminate the need for a user to recharge a large-capacity energy storage device such as a terminal battery or another car battery through a charging cradle or a power outlet, the battery is recharged using various RF radio signals for wireless communication. Therefore, there is a demand for an RF energy harvesting device for smoothly utilizing a wireless communication service.

Accordingly, the present invention is to solve the above-described problems, an object of the present invention, by using a radio signal emitted around the charge of a large-capacity energy storage device such as a battery of a mobile terminal, a car battery, or can supply power to the system. To provide an RF energy harvesting system and method.

In addition, the present invention provides a high-performance RF energy harvesting system and method capable of amplifying a weak radio signal using multi-stage amplification and rectification and rectifying it with DC to charge a battery or a large energy storage device or to power a system.

First, to summarize the features of the present invention, the RF energy harvesting system according to an aspect of the present invention for achieving the above object of the present invention, an impedance matching circuit for receiving the RF signal received through the antenna; And a multistage amplification and rectification circuit coupled to an output of the impedance matching circuit, wherein the multistage amplification and rectification circuit comprises: a clamp circuit in which a first capacitor and a reverse diode are connected between two input terminals, and both terminals of the reverse diode. A stage circuit based circuit comprising a peak rectifier with a forward diode and a second capacitor connected therebetween.

The multi-stage amplification and rectification circuit includes: a second stage circuit including a second clamp circuit connected between both terminals of the forward diode, and a second peak rectifier connected between both terminals of the second clamp circuit; And a third stage circuit including a third clamp circuit connected between both terminals of the second stage circuit, and a third peak rectifier connected between both terminals of the third clamp circuit.

The reverse diode includes an NMOS transistor connecting a source terminal and a gate terminal, and the forward diode includes an NMOS transistor connecting a drain terminal and a gate terminal.

In addition, the RF energy harvesting system according to another aspect of the present invention, the impedance matching circuit for receiving the surrounding RF signal received through the antenna; And a multistage amplification and rectification circuit coupled to an output of the impedance matching circuit, wherein the multistage amplification and rectification circuit comprises: a clamp circuit having a first capacitor and an NMOS transistor coupled between two input terminals, and a source of the NMOS transistor; A circuit based on a stage circuit comprising a peak rectifier connected between a drain terminal and a PMOS transistor and a second capacitor, wherein the gate terminal of the NMOS transistor and the gate terminal of the PMOS transistor are connected to one contact point, and the contact point and the stage circuit are provided. A first resistor connected between one output terminal of the second resistor, a second resistor and a third capacitor connected in parallel between the contact point and the other output terminal of the stage circuit.

In addition, the RF energy harvesting system according to another aspect of the present invention, a plurality of RF energy harvesting device and a controller for selecting and operating any one of the plurality of RF energy harvesting device, the plurality of RF energy harvesting device Each of the impedance matching circuit for receiving the RF signal of the surroundings received through the antenna; A multistage amplification and rectification circuit coupled to the output of the impedance matching circuit; An RF power detector for detecting power of the RF signal; And a peak detector for detecting the output of the multi-stage amplification and rectification circuit, wherein the controller operates by selecting any one of the plurality of RF energy harvesting devices based on the output of the RF power detector and the output of the peak detector. The multi-stage amplification and rectification circuit included in the selected RF energy harvesting device may include a clamp circuit in which a first capacitor and a reverse diode are connected between two input terminals, and a forward diode and a second terminal between both terminals of the reverse diode. The voltage is output based on a stage circuit comprising a peak rectifier to which the capacitor is connected.

The RF energy harvesting system may be embedded in a mobile terminal, and may charge a battery of the mobile terminal or supply power for operation of the mobile terminal based on an output voltage of the multi-stage amplification and rectification circuit.

In addition, the RF energy harvesting method according to another aspect of the present invention, by receiving the surrounding RF signal through the antenna and outputs to the impedance matching circuit, by using a multi-stage amplification and rectification circuit coupled to the output of the impedance matching circuit The multi-stage amplifying and rectifying circuit supplies a voltage, and stores a reverse voltage by using a clamp circuit connected to a first capacitor and a reverse diode between two input terminals, and converts a forward diode and a positive voltage between both terminals of the reverse diode. A forward voltage raised by the reverse voltage is output using a peak rectifier connected with a second capacitor.

The battery of the mobile terminal is charged using the voltage output from the multi-stage amplification and rectification circuit or the power for the operation of the mobile terminal is supplied.

According to the high-performance RF energy harvesting system and method according to the present invention, by using a multi-stage amplification and rectification method to amplify the radio signal radiated to the surroundings slightly and rectified to DC to harvest the energy, to charge the battery of the mobile terminal with high performance Or power the mobile terminal.

1 is a view for explaining the concept of the RF energy harvesting method according to an embodiment of the present invention.
2 is a detailed block diagram of an RF energy harvesting system according to an embodiment of the present invention.
3 is a diagram illustrating a matching circuit and an amplifying and rectifying circuit according to an embodiment of the present invention.
4 is a graph of output characteristics for the circuit of FIG. 3.
5 is a diagram illustrating a matching circuit and a multi-stage amplification and rectifying circuit according to an embodiment of the present invention.
6 is a characteristic graph of the multi-stage amplification and rectification circuit according to the frequency of the RF source.
7 is a characteristic graph of the multi-stage amplification and rectification circuit according to the power of the RF source.
8 is a characteristic graph of the multi-stage amplification and rectification circuit according to the distance from the RF source.
9 is an embodiment of a matching circuit and an amplification and rectifying circuit according to an embodiment of the present invention.
10 is another embodiment of a matching circuit and an amplifying and rectifying circuit according to an embodiment of the present invention.
FIG. 11 is a graph comparing output voltages according to powers of RF sources in the matching circuits of FIGS. 9 and 10, and the amplification and rectification circuits.
12 is a result table summarizing the results of FIG. 11.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. Like reference symbols in the drawings denote like elements.

1 is a view for explaining the concept of the RF energy harvesting method according to an embodiment of the present invention.

According to an embodiment of the present invention, a radio frequency (RF) source that may be used to wirelessly charge a battery of a mobile terminal or to supply power for operation of the mobile terminal may be various RF signals radiated around for wireless communication. Can be. The RF signal may be a signal of any frequency band radiated with a constant power, such as a microwatt low power electromagnetic wave signal or a tens of watts high power electromagnetic wave signal. For example, an RF signal radiated from an antenna of a base station for mobile communication such as GSM, (W) CDMA may be used. In addition, an RF signal radiated from an antenna of a base station for wireless Internet, WIBRO, etc., RF signal from a satellite antenna for GPS, RF signal from an antenna of a relay station for radio broadcasting, TV broadcasting, DMB, or the like, or a user source generator for generating an RF signal of an arbitrary band by receiving electrical energy from a power outlet. Various electromagnetic signals may be used, such as from RF signals.

Here, the mobile terminal (mobile communication terminal), in addition to the cellular phone (PCS phone: Personal Communications Services phone), synchronous / asynchronous IMT-2000 (International Mobile Telecommunication-2000), or Palm PC (Palm Personal) All wireless communication services such as computers, personal digital assistants (PDAs), smart phones, WAP phones (Wireless application protocol phones), and mobile play-stations Means the terminal.

The RF energy harvesting system 100 according to the present invention may be embedded in such a mobile terminal, and the RF energy harvesting system 100 may be able to charge a battery of the mobile terminal or supply power for the operation of the mobile terminal.

Here, the RF energy harvesting system 100 for charging or supplying a battery of the mobile terminal will be described, but the RF energy harvesting system 100 according to an embodiment of the present invention is embedded in a system using a battery such as an automobile. It can be applied to charge a large capacity energy storage device such as a battery of the system or to power the system such as a car.

The RF energy harvesting system 100 according to the present invention includes an antenna 110 for receiving a surrounding RF signal, an impedance coupled to the antenna 110 (for example, 50 ohms), a matching circuit 120, and a matching circuit ( Harvest energy using ambient RF signals based on rectifier 130 coupled to 120, voltage amplifier 140 coupled to rectifier 130, and controller 150 controlling the output of voltage amplifier 140. do. The controller 150 may select whether to charge the battery of the mobile terminal with the output of the voltage amplifier 140 or whether to supply power for the operation of the mobile terminal.

2 is a detailed block diagram of the RF energy harvesting system 200 according to an embodiment of the present invention.

Referring to FIG. 2, the RF energy harvesting system 200 according to an embodiment of the present invention includes a controller 210, a first RF energy harvesting device 220, a second RF energy harvesting device 230, and a switch. 240.

Here, the first RF energy harvesting device 220 and the second RF energy harvesting device 230 are an antenna 221/231, a matching circuit 222/232, a multi-stage amplification and rectification circuit 223/233, and an output. Capacitors 224/234, RF power detectors 225/235, and peak detectors 226/236. Here, the first RF energy harvesting device 220 and the second RF energy harvesting device 230 harvest energy from ambient RF signals having different frequencies (for example, 400 MHz and 2.4 GHz, respectively). Here, the RF energy harvesting device is described as an example of two (220, 230), in some cases, RF energy harvesting device having the same configuration may be further included.

The controller 210 may select and operate any one of the first RF energy harvesting device 220 and the second RF energy harvesting device 230. The RF power detector 225/235 detects the power of the RF signal received through the antenna 221/231, and the peak detector 226/236 outputs the multi-stage amplification and rectification circuit 223/233, i.e. The multi-stage amplification and rectification circuits 223/233 detect the corresponding voltage when charging the output capacitors 224/234. The controller 210 is based on the amount of power detected by the RF power detector 225/235 and the magnitude of the voltage detected by the peak detector 226/236. Any one of 230 may be selected and operated. For example, if the output of the RF power detector 225 is greater than the output of the RF power detector 235, and the output of the peak detector 226 is greater than the output of the peak detector 236, then the controller 210 may generate a first RF. The energy harvesting device 220 is operated, and at this time, the switch 240 is controlled to output a voltage (eg, DC) output through the matching circuit 222, the multi-stage amplification and rectifying circuit 223, and the output capacitor 224. Voltage) may be supplied to supply a power for charging the battery of the mobile terminal or the operation of the mobile terminal. At this time, the operation of the second RF energy harvesting device 230 is stopped. For this purpose, the controller 210 may control the RF signal received through the antenna 231 by using a predetermined switch so that the RF signal is not input to the matching circuit 232. Can be.

In the above, the method in which the controller 210 selects and operates the first RF energy harvesting device 220 has been described. Similarly, when the power of the RF signal received through the antenna 231 is large, the second RF energy harvesting device ( 230 may be selected and operated in a manner similar to the above.

The matching circuit 222/232 and the multi-stage amplifying and rectifying circuits 223/233 of the RF energy harvesting devices 220/230 are based on the matching circuit 310 and the amplifying and rectifying circuit 320 shown in FIG. 3, respectively. Energy can be harvested.

Referring to FIG. 3, the matching circuit 310 is a circuit for matching impedance of the antenna (for example, 50 ohms) and impedance, and includes a capacitor (Ctune) coupled to both ends of the antenna. It may further include an inductor, a resistor, and the like. The amplification and rectification circuit 320 includes a clamp circuit 312 and a peak rectifier 322. For the multi-stage amplification and rectification circuits 223/233, a plurality of stage circuits consisting of the amplification and rectification circuits 320 may be combined and used.

The clamp circuit 312 is a circuit in which a capacitor Cclamp and a reverse diode D1 are connected in series between two input terminals. The peak rectifier 322 is a circuit in which a forward diode D2 and a capacitor are connected in series between both terminals of the reverse diode D1. Here, the forward direction is a direction in which current flows from the + terminal of the antenna to the-terminal of the antenna, and conducts when the voltage of the + terminal of both terminals is greater than the voltage of the-terminal, otherwise it is turned off.

In FIG. 3, the antenna receives an RF signal in the form of an AC voltage. When a negative voltage comes from the antenna, the reverse diode D1 is turned on, and the reverse voltage is stored in the capacitor Clamp. When the positive voltage comes from the antenna at the next instant, the reverse diode D1 is turned off and the forward diode D2 is turned on, at which point the incoming positive voltage and the reverse voltage stored in the capacitor are summed. The summed voltage, that is, the forward voltage raised by the reverse voltage may be output to the capacitor through the forward diode D2. When a plurality of amplification and rectification circuits 320 are combined, the amplification and output of the voltage input through the antenna as desired in the above manner can be output.

4 is a graph of output characteristics for the circuit of FIG. 3. 4 is a simulation result using a predetermined simulator, it can be seen that the amplification and rectification circuit 320 amplifies the input voltage approximately twice. The multi-stage amplification and rectification circuits 223/233, in which n (natural number) stage circuits are combined using the amplification and rectification circuit 320 as stage circuits, are almost 2n times the input voltage Vin as shown in [Equation 1]. It is possible to generate the output voltage (Vout) of.

[Equation 1]

Vout ≒ 0.95 * 2n * Vin

5 is a diagram illustrating a matching circuit 222/232 and a multi-stage amplification and rectifying circuit 223/233 according to an embodiment of the present invention.

In FIG. 5, the matching circuit 222/232 is similar to the matching circuit 310 of FIG. 3, and the clamp circuit C11 of the first stage circuit Stage-1 of the multi-stage amplification and rectification circuits 223/233. D11) and the peak rectifiers D12 and C12 are similar to the clamp circuits Cclamp and D1 of FIG. 3 and the peak rectifiers D2 and Crectifier of the amplification and rectification circuit 320 of FIG. 3. In addition, the multi-stage amplification and rectifying circuits 223 and 233 further include a second stage circuit Stage-2 and a third stage circuit Stage-3 coupled to the first stage circuit Stage-1.

Clamp circuits C21 and D21 and peak rectifiers D22 and C22 of the second stage circuit Stage-2 and clamp circuits C31 and D31 and peak rectifiers D32 and C32 of the third stage circuit Stage-3. ) Is coupled similarly to the way in which the clamp circuits C11 and D11 of the first stage circuit Stage-1 and the peak rectifiers D12 and C12 are coupled. However, the clamp circuits C21 and D21 of the second stage circuit Stage-2 are connected between two terminals of the forward diode D2 of the first stage circuit Stage-1, and the second stage circuit Stage- The peak rectifiers D32 and C32 of 2) are connected between the two terminals of the clamp circuits C21 and D21 in the same manner as in FIG. 3. In addition, the clamp circuits C31 and D31 of the third stage circuit Stage-3 are connected between the two terminals of the first stage circuit Stage-1, and the peak rectifier of the third stage circuit Stage-3 ( D32 and C32 are connected between two terminals of the clamp circuits C31 and D31 in the same manner as in FIG. 3.

6 is a characteristic graph of the multi-stage amplification and rectifying circuit 223/233 according to the frequency of the RF source. Here is an example of when the RF source radiates power at 13 dBm from the antenna (315/400 MHz antenna). In addition, the capacitance of the matching circuit 310 is adjusted to give the maximum output for each frequency. As the frequency of the RF source is changed as shown in FIG. 6, the power received by the energy harvesting device through the antenna may vary slightly, and an optimal frequency may be selected to receive optimal power.

7 is a characteristic graph of the multi-stage amplification and rectification circuits 223/233 according to the power of the RF source. Here, an example of receiving 400 MHz or 2.4 GHz from an antenna when changing the power of an RF source is shown. As the power of the RF source changes as shown in FIG. 7, the power received by the energy harvesting device through the antenna is proportional, and the energy harvesting device may receive an optimal power with respect to the power of any RF source.

8 is a characteristic graph of the multi-stage amplification and rectifying circuit 223/233 according to the distance from the RF source. Here, an example of receiving 400 MHz or 2.4 GHz from the antenna when changing the distance from the RF source is shown. As shown in FIG. 8, the power received by the energy harvesting device through the antenna is proportional to the distance from the RF source. However, for 2.4 GHz, the reception power decreases when the distance is increased due to a surrounding effect such as a building. Larger output capacitor 224 may take longer to charge, but may increase receive power.

9 is an embodiment of the matching circuit 310 and the amplification and rectifying circuit 320 according to an embodiment of the present invention. In FIG. 9, the matching circuit 310 of FIG. 3 may include a circuit 910 including an inductor Lm. Here, the circuit 910 may further include a capacitor Cm. The amplification and rectification circuit 320 may include a circuit 920 including a capacitor Cm, field effect transistors N1 and N2, and a capacitor C A. Capacitor Cm also contributes to impedance matching but also to the storage of reverse voltage. Here, among the NMOS transistors, a source terminal and a gate terminal of the first NMOS transistor N1 for the reverse diode are connected. In addition, a drain terminal and a gate terminal are connected to the second NMOS transistor N2 for the forward diode. Similar to the operation of FIG. 3, the forward voltage amplified by the capacitor C A is output.

10 is another embodiment of the matching circuit 310 and the amplifying and rectifying circuit 320 according to an embodiment of the present invention. In FIG. 10, the matching circuit 310 of FIG. 3 may be formed of a circuit 1010 including an inductor Lm. Here, the circuit 1010 may further include a capacitor (Cm). The amplification and rectifying circuit 320 includes a capacitor Cm, an NMOS transistor N3, a PMOS transistor P1, a first resistor R1, a second resistor R2, a capacitor C 1 , and a capacitor C B. It may be made of a circuit 1020 including a. Capacitor Cm also contributes to impedance matching but also to the storage of reverse voltage.

Here, the gate terminal of the NMOS transistor N1 and the gate terminal of the PMOS transistor P1 are connected to one contact point, and the first resistor R1 is connected between the contact point and one output terminal of the stage circuit 1020. The second resistor R2 and the capacitor C 1 are connected in parallel between the contact point and the other output terminal of the stage circuit 1020. Similar to the operation of FIG. 3, the forward voltage amplified by the capacitor C B is output.

FIG. 11 is a graph comparing output voltages according to powers of RF sources in the matching circuits of FIGS. 9 and 10, and the amplification and rectification circuits. 12 is a result table summarizing the results of FIG. 11. When the amplification and rectification circuit 320 is implemented as shown in FIG. 10, it can be seen that as shown in FIGS. 11 and 12, an output of higher power is generated in the entire section of the input power of the RF source than in the circuit of FIG. 9. have. In particular, when the input power is 1000 microwatts, the circuit of FIG. 10 produces the highest power output, and above or below it, the increase in power appears slightly smaller.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

210: controller
220: first RF energy harvesting device
230: second RF energy harvesting device
240: switch
221, 231: antenna
222, 232: matching circuit
223, 233: multi-stage amplification and rectification circuit
224, 234: output capacitor
225, 235: RF power detector
226, 236: peak detector

Claims (8)

  1. An impedance matching circuit which receives the surrounding RF signal received through the antenna; And
    A multi-stage amplification and rectification circuit coupled to the output of the impedance matching circuit,
    The multi-stage amplification and rectification circuit,
    A first stage circuit comprising a first clamp circuit having a first capacitor and a reverse diode connected between two input terminals, and a first peak rectifier having a forward diode and a second capacitor connected between both terminals of the reverse diode; A second stage circuit comprising a second clamp circuit connected between both terminals of the forward diode, and a second peak rectifier connected between both terminals of the second clamp circuit; And a third clamp circuit connected between both terminals of the second stage circuit, and a third peak rectifier connected between both terminals of the third clamp circuit.
    RF energy harvesting system comprising a.
  2. delete
  3. The method of claim 1,
    And the reverse diode comprises an NMOS transistor connecting a source terminal and a gate terminal, and the forward diode comprises an NMOS transistor connecting a drain terminal and a gate terminal.
  4. An impedance matching circuit which receives the surrounding RF signal received through the antenna; And
    A multi-stage amplification and rectification circuit coupled to the output of the impedance matching circuit,
    The multi-stage amplification and rectifying circuit includes a clamp circuit having a first capacitor and an NMOS transistor coupled between two input terminals, and a peak rectifier having a PMOS transistor and a second capacitor connected between the source and drain terminals of the NMOS transistor. Is a circuit based on
    A gate terminal of the NMOS transistor and a gate terminal of the PMOS transistor are connected to one contact, and a first resistor connected between the contact and one output terminal of the stage circuit, and in parallel between the contact and the other output terminal of the stage circuit. And a second resistor and a third capacitor connected to the RF energy harvesting system.
  5. A controller for selecting and operating any one of a plurality of RF energy harvesting devices and the plurality of RF energy harvesting devices,
    Each of the plurality of RF energy harvesting device,
    An impedance matching circuit which receives the surrounding RF signal received through the antenna;
    A multistage amplification and rectification circuit coupled to the output of the impedance matching circuit;
    An RF power detector for detecting power of the RF signal; And
    A peak detector for detecting the output of the multi-stage amplification and rectification circuit,
    When the controller selects and operates any one of the plurality of RF energy harvesting devices based on the output of the RF power detector and the output of the peak detector, the corresponding multi-stage amplification and rectification circuit included in the selected corresponding RF energy harvesting device. Outputs a voltage based on a stage circuit comprising a clamp circuit having a first capacitor and a reverse diode connected between two input terminals, and a peak rectifier having a forward diode and a second capacitor connected between both terminals of the reverse diode. RF energy harvesting system characterized by.
  6. The method of claim 5,
    The RF energy harvesting system is a RF energy harvesting system, characterized in that for charging the battery embedded in a predetermined system or supplying power for the operation of the predetermined system based on the output voltage of the multi-stage amplification and rectification circuit.
  7. Receives the surrounding RF signal through the antenna and outputs it to the impedance matching circuit,
    Supplying a constant voltage using a multi-stage amplification and rectification circuit coupled to the output of the impedance matching circuit,
    Here, the multi-stage amplification and rectification circuit stores a reverse voltage by using a clamp circuit in which a first capacitor and a reverse diode are connected between two input terminals, and a forward diode and a second capacitor are connected between both terminals of the reverse diode. RF harvesting method characterized in that for outputting the forward voltage raised by the reverse voltage using a peak rectifier.
  8. The method of claim 7, wherein
    RF energy harvesting method characterized in that for charging the battery of a predetermined system or supplying power for the operation of the predetermined system using the voltage output from the multi-stage amplification and rectification circuit.
KR1020100055263A 2010-06-11 2010-06-11 Radio Frequency Energy Harvesting System and Method for Charging Battery of Mobile Devices KR101183525B1 (en)

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CN108390160A (en) 2012-11-09 2018-08-10 加州理工学院 Smart RF lensing: efficient, dynamic and mobile wireless power transfer
EP3072213A4 (en) 2013-11-22 2017-08-16 California Institute Of Technology Active cmos recovery units for wireless power transmission
KR20170044120A (en) 2014-08-19 2017-04-24 캘리포니아 인스티튜트 오브 테크놀로지 Wirelss power transfer
KR20170119325A (en) * 2014-10-14 2017-10-26 오하이오 스테이트 이노베이션 파운데이션 Systems capable of self-harvesting energy from wireless devices and methods of using the same

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