WO2004077550A1 - Wireless battery charging system using rectenna - Google Patents
Wireless battery charging system using rectenna Download PDFInfo
- Publication number
- WO2004077550A1 WO2004077550A1 PCT/KR2003/000746 KR0300746W WO2004077550A1 WO 2004077550 A1 WO2004077550 A1 WO 2004077550A1 KR 0300746 W KR0300746 W KR 0300746W WO 2004077550 A1 WO2004077550 A1 WO 2004077550A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rectenna
- high frequency
- voltage
- frequency power
- charging system
- Prior art date
Links
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 17
- 238000009499 grossing Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
- H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- H04B5/79—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/20—The network being internal to a load
- H02J2310/22—The load being a portable electronic device
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0044—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction specially adapted for holding portable devices containing batteries
Definitions
- the present invention relates to a wireless battery charging system using a rectenna for wirelessly charging a battery.
- appliances such as a mobile wireless telephone, a personal digital assistant, a portable camcorder or the like, utilize electric energy charged in a battery as a power source.
- the battery used in these appliances is adapted to be recharged. Accordingly, the battery of the appliance is charged through a separate charging unit.
- a battery charging system widely supplied up to now drops a common voltage (110-220 volts AC) to a desired level of voltage to implement full- wave rectification, and supplies the full-wave rectified power to the battery.
- This system is constructed in such a manner that an output terminal of the full- wave rectified DC is directly contacted with terminals of the battery, thereby charging the battery from the charging unit. The construction of this charging system will nowbe described with reference to Figs. 1 and 2.
- reference numeral 12 denotes a power code for inputting the common electric power
- reference numeral 14 denotes a charger for dropping AC power inputted from the power code 12 to a desired level of voltage and rectifying the dropped AC power to generate DC voltage.
- the charger 14 includes electrode connectors 16 for contacting anode and cathode of the battery of the mobile terminal.
- Reference numeral 18 denotes the mobile terminal operated by the electricity supplied from the rechargeable battery. If the electrodes of the battery assembled to a rear of the mobile terminal are contacted with the electrode connectors 16 of the charger 14, the DC voltage is supplied to the battery from the charger 14, so as to charge the battery.
- the conventional battery charging system can be used when the power code 12 of the charger 14 is connected to an electrical receptacle. Therefore, the system has a decisive problem in that it cannot charge the battery during a user moves. In addition, when the battery of the mobile terminal is charged through the charger 14, there is a contact inferior between the electrode connectors 16 of the charger and the electrodes. This reason may cause the charger to be out of order.
- a magnetic-induction coupling method for charging the battery in state that the voltage terminals of the charging system are not contacted with the electrodes of the battery and a non-contact charging system using non-radiative dielectric (NRD) waveguide technology.
- NRD non-radiative dielectric
- the battery of the mobile terminal is wirelessly charged by means of the charger 14 according to the magnetic-induction coupling method or the NRD waveguide technology.
- the charging system employing the magnetic-induction coupling method is to charge the battery with the current through magnetic-induction coupling of transformers.
- problems such as a limitation of induced coupling distance between a transmitter and a receiver, a bulky size, and high power dissipation.
- the wireless charging system employing the NRD waveguide technology which electric property is changed in a high frequency band utilizes a high frequency of above 30 GHz.
- a financial burden is increased, and the power dissipation is resulted from a medium (rain, fog, steam, etc.) variation of a space.
- the system is limited to several conditions.
- an object of the present invention is to solve the problems involved in the prior art, and to provide a wireless battery charging system capable of minimizing power transmitting interference according to a medium (rain, fog, steam, etc.) variation when electric power is transmitted via a space and receiving a radio wave radiated from a distance.
- Another object of the present invention is to provide a wireless charging circuit capable of receiving a radio wave radiated from a distance using a rectenna to charge a battery.
- a wireless battery charging system using a rectenna comprising a transmitting section for outputting a radio wave of a given power through an array of an antenna, a DC power converting section for receiving the radio wave through the rectenna and converting the radio wave to a DC voltage of a given level, and a voltage stabilizing circuit for stabilizing the DC voltage to maintain a constant voltage
- Figs. 1 and 2 are perspective views of one conventional battery charging system.
- Fig. 3 is a perspective view of another conventional battery charging system.
- Fig. 4 is a block diagram illustrating one preferred embodiment of the present invention.
- Fig. 5 is a block diagram illustrating a DC power converting section using an array rectenna in Fig. 4.
- a conventional transmitting system used in a sky wave relay may be employed as a transmitter for transmitting high frequency power, so that additional units are not required.
- a transmitting antenna is constructed in type of an array antenna so as to improve efficiency of high frequency power to be transmitted.
- a DC power converting section corresponding to a receiving section includes a receiving array rectenna for receiving a high frequency power emitted from the array antenna of the transmitter, an RF rectifier for regulating the high frequency power received from the array rectenna, an RF blocking filter for suppressing ripple generated from a smoothing circuit and a load and interference of inductive electromagnetic wave, the smoothing circuit for converting the half-wave or full-wave rectified high frequency power by RF rectifier to DC voltage, and a voltage stabilizing circuit for converting the DC voltage to battery charging voltage
- the high frequency power transmitter may utilize the power of information and broadcasting signal for the sky wave relay.
- the array rectenna receives the high frequency emitted from the array antenna of the transmitter, and the high frequency is rectified and filtered to maintain a constant voltage to be supplied to connectors of battery electrodes, Therefore, the system is not limited to a length of power code, and the problems due to the wireless charging mode according to the magnetic-induction coupling method or the NRD waveguide technology are solved.
- Fig. 4 is a schematic view illustrating a construction of a wireless battery charging system using a rectenna according to a preferred embodiment of the present invention.
- a high frequency power transmitting section 20 modulates digital information or analog information and emits the high frequency amplified from the modulated information to a space via the array antenna 22 connected to an output node. At that time, it is noted that the information outputted from the high frequency power transmitting section 20 may be unmodulated information.
- the high frequency power transmitting section 20 may utilize a sky wave relay, for example, a relay of code division multiple access (CDMA) of cellular mobile radio system. Accordingly, the antenna is preferably assembled as the array artna, as shown in Fig. 5, so as to increase the efficiency of the high frequency power emitted to the space.
- a sky wave relay for example, a relay of code division multiple access (CDMA) of cellular mobile radio system.
- CDMA code division multiple access
- the high frequency power emitted from the array antenna 22 of the high frequency power transmitting section 20 is received by a rectenna 24 connected to the receiver built in a mobile terminal distantly positioned in the space.
- the array rectenna 24 rectifies the received high frequency power to convert it to DC voltage, and filters the converted DC voltage to remove a high frequency component andan unwanted wave component from the DC voltage and supply the filtered DC voltage to a voltage stabilizing circuit 26.
- the voltage stabilizing circuit 26 stabilizes the rectified and smoothed DC voltage to maintain a constant voltage and supplies the DC vdtage to the electrodes of a chargeable battery 28 connected to an output node.
- the high frequency power transmitting section 20 composed of the sky wave relay emits the high frequency power to the space via the array antenna 22
- the array antenna 24 built in the mobile terminal receives the high frequency power.
- the array rectenna 24 rectifies and filters the high frequency to convert the high frequency to the DC voltage and supply it to the voltage stabilizing circuit 26, thereby charging the battery 28.
- Fig. 4 does not depict a construction of preventing overcharge of the chargeable battery 28.
- the wireless charging system of the present invention may be provided with an overcharge preventing circuit which detects a voltage level of the chargeable battery and switches on/off an output of the voltage stabilizing circuit 26 to prevent the overcharge of the battery.
- the above operation will be more clearly understood with reference to Fig. 5 depicting the connecting construction of the array rectenna 24, the voltage stabilizing circuit 26 and the chargeable battery 28 which are built in the receiver, i.e., the mobile terminal.
- Fig. 5 illustrates the construction of the DC power converting section using the array rectenna 24 of Fig. 4. Referring to Fig.
- the array rectenna 24 consists of at least one rectenna arrayed and connected in a matrix type.
- the rectenna 24 includes a Schottky diode 30 with an anode and a cathode connected to antenna 231 and 33 spaced apart from each other, an RF blocking filter 32 for suppressing ripple and conductive electromagnetic wave interference, and a smoothing circuit 34 for converting the high frequency power half- or full-wave rectified by the Schottky diode.
- the RF blocking filter and the smoothing circuit are connected to the anode and cathode of the Schottky diode.
- a plurality of rectennas are arranged in one or more than column and row directions to form the matrix array, the Schottky diodes arranged in the respective columns are connected in parallel.
- anodes of a plurality of Schottky diodes of the rectenna positioned in the first column are connected to cathode electrodes of the voltage stabilizing circuit 26, while cathodes of a plurality of Schottky diodes of the rectenna positioned in the last column are connected to anode electrodes of the voltage stabilizing circuit.
- Anodes and cathodes of a plurality of Schottky diodes of the rectenna positioned in the remaining columns between the first and last columns are connected to anodes and cathodes of the Schottky diodes positioned theadjacent columns.
- the array rectenna 24 consists of a plurality of rectennas connected to each other in the matrix array, so that wanted wattage of DC voltage may be obtained.
- connected position of the Schottky diode connected between the antennas 31 and 33 may be adjusted to obtain impedance matching between the antennas 31 and 33 and the Schottky diode.
- the array rectenna constructed as shown in Fig. 5 is formed in a microstrip line structure by properly designing a conductive board formed on a dielectric substrate. If the high frequency power outputted from the high frequency power transmitting section constructed as shown in Fig. 4 is transmitted by the array antenna 22 and is received by the array rectenna 24 constructed as shown in Fig. 5, the antennas 31 and 33 of the array rectenna 24 receive the high frequency power. At that time, parasitic capacity between the Schottky diodes connected between the antennas 31 and 33 is minimized and the Schottky diodes rectify the high frequency to the DC voltage. In other words, the Schottky diodes rectify the high frequency power received through the antmnas 31 and 33.
- the RF blocking filters and the smoothing circuits connected to the anodes and cathodes of the Schottky diodes suppress and remove the ripple component and the conductive electromagnetic wave interfering signal contained in the rectified voltage to supply the DC voltage dependant the level of the high frequency power to the voltage stabilizing circuit 26.
- the voltage stabilizing circuit 26 stabilizes a level of DC voltage outputted from the array rectenna 24 to supply the constant voltage clamped to a given level to the anode and cathode of the battery 28 connected to the mobile terminal, thereby charging the battery cell.
- the array rectenna receives the high frequency power emitted from the high frequency power transmitting section such as a sky wave relay, converts the received high frequency power to a given level of DC voltage, and removes the unwanted wave to supply the DC voltage to the battery as a charging voltage, thereby freely charging the battery of the mobile terminal.
- the high frequency power transmitting section such as a sky wave relay
- the wireless charging system using the rectenna may solve the problems of the using limitation (usage of power code) and the power dissipation due to the contact inferior of connoting points in a conventional wire charging system, and also solve the problems caused by the non-contact charging system employing the magnetic-induction coupling method and the NRD waveguide technology, thereby wirelessly charging the battery of the motile terminal.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003225376A AU2003225376A1 (en) | 2003-02-28 | 2003-04-14 | Wireless battery charging system using rectenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-0012701 | 2003-02-28 | ||
KR1020030012701A KR20040077228A (en) | 2003-02-28 | 2003-02-28 | Wireless charging system using rectenna |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004077550A1 true WO2004077550A1 (en) | 2004-09-10 |
Family
ID=32923765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2003/000746 WO2004077550A1 (en) | 2003-02-28 | 2003-04-14 | Wireless battery charging system using rectenna |
Country Status (3)
Country | Link |
---|---|
KR (1) | KR20040077228A (en) |
AU (1) | AU2003225376A1 (en) |
WO (1) | WO2004077550A1 (en) |
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FR2883428A1 (en) * | 2005-03-18 | 2006-09-22 | Michel Burri | Cell or battery recharging method for e.g. portable telephone, involves generating periodic signal by control block of charger via amplifier to excite LC series circuit to emit magnetic field, where circuit includes antenna and capacitance |
DE102006033956A1 (en) * | 2006-07-22 | 2008-01-31 | Deutsche Telekom Ag | Communication device emergency power supply method, involves providing emergency energy storage, particularly in addition to power supply, in communication device for normal communication |
US8373514B2 (en) | 2007-10-11 | 2013-02-12 | Qualcomm Incorporated | Wireless power transfer using magneto mechanical systems |
US8378522B2 (en) | 2007-03-02 | 2013-02-19 | Qualcomm, Incorporated | Maximizing power yield from wireless power magnetic resonators |
US8378523B2 (en) | 2007-03-02 | 2013-02-19 | Qualcomm Incorporated | Transmitters and receivers for wireless energy transfer |
US8447234B2 (en) | 2006-01-18 | 2013-05-21 | Qualcomm Incorporated | Method and system for powering an electronic device via a wireless link |
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