Source: http://www.google.ca/patents/US9812890
Timestamp: 2017-12-13 11:08:45
Document Index: 312583346

Matched Legal Cases: ['art 18', 'Application No. 14868901', 'Application No. 16189300', 'Application No. 16189974', 'Application No. 16189982', 'Application No. 16189988', 'Application No. 16193743', 'Application No. 16196205']

Patent US9812890 - Portable wireless charging pad - Google Patents
The present disclosure provides a method and apparatus for improved wireless charging pads for charging and/or powering electronic devices. Such pads may not require a power chord for connecting to a main power supply, for example a wall outlet. In contrast, power may be delivered wireless to the foregoing...http://www.google.ca/patents/US9812890?utm_source=gb-gplus-sharePatent US9812890 - Portable wireless charging pad
Publication number US9812890 B1
Application number US 14/585,341
Publication number 14585341, 585341, US 9812890 B1, US 9812890B1, US-B1-9812890, US9812890 B1, US9812890B1
Patent Citations (879), Non-Patent Citations (143), Classifications (11)
US 9812890 B1
receiving, by at least one receiver antenna of a near-field cordless charging pad, energy from a first pocket of energy formed from constructive interference of a first plurality of power waves emitted from a first plurality of transmitter antennas of a far-field wireless power transmitter that is distinct from the near-field cordless charging pad;
charging, using the energy received by the at least one receiver antenna from the first pocket of energy, a first battery of the near-field cordless charging pad; and
transmitting, by a second plurality of transmitter antennas of the near-field cordless charging pad that is powered by the first battery, a second plurality of power waves to constructively interfere to form a second pocket of energy at a receiver, wherein the receiver is configured to convert energy of the second pocket of energy to charge a second battery of an electronic device that is coupled with the receiver, wherein the near-field cordless charging pad is in proximity of the electronic device.
2. The method of claim 1, wherein an additional receiver coupled to the at least one receiver antenna of the near-field cordless charging pad and the far-field wireless power transmitter coupled to the first plurality of transmitter antennas communicate to control the charging of the first battery of the near-field cordless charging pad.
3. The method of claim 1, wherein the receiver communicates a power level of the second battery of the electronic device to the near-field cordless charging pad.
the electronic device is a first electronic device, and
the second plurality of transmitter antennas wirelessly charges a second electronic device by transmitting a third plurality of power waves that converge to form a third pocket of energy based on the second device being in proximity of the near-field cordless charging pad.
5. The method of claim 1, wherein the near-field cordless charging pad comprises a perimeter, a surface, and the at least one receiver antenna is included in an antenna array disposed about at least one of the perimeter and the surface.
6. The method of claim 1, wherein the near-field cordless charging pad authenticates the electronic device for wireless charging from the near-field cordless charging pad in response to a request for power from the electronic device via a communications channel according to a wireless communications protocol, wherein the wireless communications protocol is selected from the group consisting of: Bluetooth, infrared, Wi-Fi, and a frequency modulation (FM) radio signal.
7. A method for wireless charging comprising:
receiving, by at least one receiver antenna of a near-field cordless charging pad, energy from a first pocket of energy defined via constructive interference of a first plurality of wireless power transmission waves emitted by a first plurality of transmitter antennas of a far-field wireless power transmitter that is distinct from the near-field cordless charging pad, wherein the near-field cordless charging pad comprises a first battery coupled to the at least one receiver antenna;
charging, using energy received by the at least one receiver antenna from the first pocket of energy, the first battery of the near-field cordless charging pad;
transmitting, by a second transmitter of the near-field cordless charging pad that is powered by the first battery, a second plurality of power transmission waves to constructively interfere to form a second pocket of energy at an electronic device, wherein the electronic device is configured to convert energy of the second pocket of energy to charge a second battery of the electronic device when the electronic device is in proximity of the near-field cordless charging pad; and
communicating, by the near-field cordless charging pad, a power level of the first battery to the far-field wireless power transmitter so that the far-field wireless power transmitter can adjust the first pocket of energy based on the power level of the first battery.
8. The method of claim 7, wherein the electronic device comprises a receiver,
wherein the near-field cordless charging pad decodes a signal from the receiver, identifies at least one of a gain of the signal and a phase of the signal, and determines a proximity of the receiver to the near-field cordless charging pad based on at least one of the gain and the phase, and
wherein the near-field cordless charging pad controls transmission of the second plurality of power transmission waves by adjusting respective gains and phases of the second plurality of power transmission waves based on the proximity of the electronic device to the second transmitter.
9. The method of claim 8, wherein the second transmitter of the near-field cordless charging pad and the electronic device are at most about fifteen feet apart from each other when the second battery of the electronic device is charged via energy extracted from the second pocket of energy.
10. The method of claim 7, wherein the near-field cordless charging pad is shaped in a generally flat rectangular shape and sized about two inches by about four inches.
11. The method of claim 10, wherein the near-field cordless charging pad comprises a surface, and wherein a receiver coupled to the at least one receiver antenna of the near-field cordless charging pad comprises a plurality of antenna elements arranged in a generally flat configuration on the surface.
12. The method of claim 10, wherein the near-field cordless charging pad comprises a top surface, and wherein a receiver coupled to the at least one receiver antenna of the near-field cordless charging pad comprises a plurality of antenna elements arranged on the top surface so that the antenna elements are able to interface with the first pocket of energy within about a fifteen foot range from the first transmitter.
searching, by the near-field cordless charging pad, for a wireless charging request sent from the electronic device;
initiating, by the near-field cordless charging pad, wireless charging of the electronic device by transmitting the second plurality of power waves that constructively interfere to form the second pocket of energy; and
ceasing, by the near-field cordless charging pad, the wireless charging when at least one of a predetermined charge criterion is met and the electronic device is out of range from the near-field cordless charging pad.
14. The method of claim 13, wherein the near-field cordless charging pad is shaped as a generally flat rectangular box with the second plurality of transmitter antennas positioned around a perimeter of the box.
15. A device for wireless charging, the device comprising:
a near-field cordless charging pad;
a plurality of receiver antenna elements disposed on a surface of the near-field cordless charging pad, wherein the plurality of receiver antenna elements are configured to interface with a first pocket of energy formed by constructive interference of a first plurality power transmission waves, wherein the first plurality of power transmission waves are transmitted by a far-field wireless power transmitter that is distinct form the near-field cordless charging pad;
a first battery coupled to the near-field cordless charging pad;
a receiver coupled to the near-field cordless charging pad, to the first battery, and to the plurality of receiver antenna elements, wherein the receiver is configured to charge the first battery via the plurality of receiver antenna elements receiving energy from the first pocket of energy; and
a transmitter coupled to the pad and powered by the first battery, wherein the transmitter has a plurality of transmitter antenna elements configured to transmit a second plurality of power transmission waves to constructively interfere to form a second pocket of energy at an electronic device so that a second battery of the electronic device can be charged via energy from the second pocket of energy.
16. The device of claim 15, wherein the transmitter is configured to receive a charging request from the electronic device through at least one of a short RF wave and a pilot signal.
17. The device of claim 15, wherein the transmitter is configured to receive a charging request through a communications functionality selected from the group consisting: a Bluetooth functionality, a Wi-Fi functionality, a Zigbee functionality, and a FM radio signal functionality.
This application is a continuation-in-part of U.S. patent application Ser. No. 13/939,706, filed Jul. 11, 2013, which is herein fully incorporated by reference in its entirety.
The present disclosure is related to U.S. patent application Ser. No. 13/891,430, filed May 10, 2013; U.S. patent application Ser. No. 13/925,469, filed Jun. 24, 2013; U.S. Non-Provisional patent application Ser. No. 14/583,625, filed Dec. 27, 2014, entitled “Receivers for Wireless Power Transmission,” U.S. Non-Provisional patent application Ser. No. 14/583,630, filed Dec. 27, 2014, entitled “Methodology for Pocket-Forming,” U.S. Non-Provisional patent application Ser. No. 14/583,634, filed Dec. 27, 2014, entitled “Transmitters for Wireless Power Transmission,” U.S. Non-Provisional patent application Ser. No. 14/583,640, filed Dec. 27, 2014, entitled “Methodology for Multiple Pocket-Forming,” U.S. Non-Provisional patent application Ser. No. 14/583,641, filed Dec. 27, 2014, entitled “Wireless Power Transmission with Selective Range,” U.S. Non-Provisional patent application Ser. No. 14/583,643, filed Dec. 27, 2014, entitled “Method for 3 Dimensional Pocket-Forming,” all of which are fully incorporated herein by reference in their entirety for all purposes.
Electronic devices, such as laptop computers, smartphones, portable gaming devices, tablets and so forth may require power for performing their intended functions. This may require having to charge the electronic device at least once a day, or in high-demand electronic devices more than once a day. Such an activity may be tedious and may represent a burden to users. For example, a user may be required to carry chargers in case one of his or her electronic devices is lacking power. In addition, users have to find available power sources to connect to. Lastly, users must plugin to a wall or other power supply to be able to charge his or her electronic device. However, such an activity may render electronic devices inoperable during charging. Current solutions to this problem may include inductive charging pads which may employ magnetic induction or resonating coils. Nevertheless, such a solution may still require that electronic devices may have to be placed in a specific place for powering. Thus, the electronic devices during charging may not be portable. For the foregoing reasons, there is a need for charging pads with improved mobility and portability.
Embodiments of the present disclosure are described by way of example with reference to the accompanying figures, which are schematic and may to be drawn to scale. Unless indicated as representing, prior art, the figures represent aspects of the present disclosure.
FIG. 1 illustrates wireless power transmission using pocket-forming, according to the present disclosure.
FIG. 2 illustrates a component level illustration for a transmitter which may be utilized to provide wireless power transmission as described in FIG. 1, according to the present disclosure.
FIG. 3 illustrates a component level embodiment for a receiver which can be used for powering or charging an electronic device as described in FIG. 1, according to the present disclosure.
FIG. 4 illustrates a wireless power transmission where a pad, with improved portability, may provide wireless power to an electronic, according to the present disclosure.
FIG. 5 illustrates a wireless power transmission where an alternate pad, with improved portability, may provide wireless power to an electronic device, according to the present disclosure.
FIG. 6 illustrates a portable pad which may include a module for storing charge, according to the present disclosure.
FIG. 7 illustrates an example situation where pad from FIG. 6 can be used, according to the present disclosure.
FIG. 2 illustrates a component level embodiment for a transmitter 200 which may be utilized to provide wireless power transmission 100 as described in FIG. 1. Transmitter 200 may include a housing 202 where at least two or more antenna elements 204, at least one RF integrated circuit (RFIC) 206, at least one digital signal processor (DSP) or micro-controller 208, and one optional communications component 210 may be included. Housing 202 can be made of any suitable material which may allow for signal or wave transmission and/or reception, for example plastic or hard rubber. Antenna elements 204 may include suitable antenna types for operating in frequency bands such as 900 MHz, 2.5 GHz or 5.8 GHz as these frequency bands conform to Federal Communications Commission (FCC) regulations part 18 (Industrial, Scientific and Medical equipment). Antenna elements 204 may include vertical or horizontal polarization, right hand or left hand polarization, elliptical polarization, or other suitable polarizations as well as suitable polarization combinations. Suitable antenna types may include, for example, patch antennas with heights from about 1/24 inches to about 1 inch and widths from about 1/24 inches to about 1 inch. Other antenna elements 204 types can be used, for example meta-materials, dipole antennas among others. RFIC 206 may include a proprietary chip for adjusting phases and/or relative magnitudes of RF signals which may serve as inputs for antenna elements 204 for controlling pocket-forming. These RF signals may be produced using an external power supply 212 and a local oscillator chip (not shown) using a suitable piezoelectric material. Micro-controller 208 may then process information send by a receiver through its own antenna elements for determining optimum times and locations for pocket-forming. In some embodiments, the foregoing may be achieved through communications component 210. Communications component 210 may be based on standard wireless communication protocols which may include Bluetooth, Wi-Fi or ZigBee. In addition, communications component 210 may be used to transfer other information such as an identifier for the device or user, battery level, location or other such information. Other communications component 210 may be possible which may include radar, infrared cameras or sound devices for sonic triangulation for determining the device's position.
FIG. 3 illustrates a component level embodiment for a receiver 300 which can be used for powering or charging an electronic device as exemplified in wireless power transmission 100. Receiver 300 may include a housing 302 where at least one antenna element 304, one rectifier 306, one power converter 308 and an optional communications component 310 may be included. Housing 302 can be made of any suitable material which may allow for signal or wave transmission and/or reception, for example plastic or hard rubber. Housing 302 may be an external hardware that may be added to different electronic equipment, for example in the form of cases, or can be embedded within electronic equipment as well. Antenna element 304 may include suitable antenna types for operating in frequency bands similar to the bands described for transmitter 200 from FIG. 2. Antenna element 304 may include vertical or horizontal polarization, right hand or left hand polarization, elliptical polarization, or other suitable polarizations as well as suitable polarization combinations. Using multiple polarizations can be beneficial in devices where there may not be a preferred orientation during usage or whose orientation may vary continuously through time, for example a smartphone or portable gaming system. On the contrary, for devices with well-defined orientations, for example a two-handed video game controller, there might be a preferred polarization for antennas which may dictate a ratio for the number of antennas of a given polarization. Suitable antenna types may include patch antennas with heights from about 1/24 inches to about 1 inch and widths from about 1/24 inches to about 1 inch. Patch antennas may have the advantage that polarization may depend on connectivity, i.e. depending on which side the patch is fed, the polarization may change. This may further prove advantageous as a receiver, such as receiver 300, may dynamically modify its antenna polarization to optimize wireless power transmission. Rectifier 306 may include diodes or resistors, inductors or capacitors to rectify the alternating current (AC) voltage generated by antenna element 304 to direct current (DC) voltage. Rectifier 306 may be placed as close as is technically possible to antenna element 304 to minimize losses. After rectifying AC voltage, DC voltage may be regulated using power converter 308. Power converter 308 can be a DC-DC converter which may help provide a constant voltage output, regardless of input, to an electronic device, or as in this embodiment to a battery 312. Typical voltage outputs can be from about 5 volts to about 10 volts. Lastly, communications component 310, similar to that of transmitter 200 from FIG. 2, may be included in receiver 300 to communicate with a transmitter or to other electronic equipment.
FIG. 4 illustrates a wireless power transmission 400 where a pad 402, with improved portability, may provide wireless power to a smartphone 404. In the prior art, pad 402 may include a power chord which may connect to a wall outlet running on alternating current (AC) power. Such AC power may then be transmitted wirelessly to smartphone 404, through magnetic induction or electrodynamics induction, via a plurality of inductive elements 406. Inductive elements 406 may include, for example, coils or inductors. As is known in the prior art, smartphone 404 may also incorporate external hardware, such as cases, which may include a plurality of inductive elements 406 (not shown) for receiving the power sent by pad 402. The foregoing configuration may not really be wireless because a power chord may still be required. In addition, the location of pad 402, and therefore of smartphone 404 may negatively be affected by the location of an available power outlet, i.e. if the wall outlet is in hard-to-reach locations such as behind a sofa or TV screen, so will be pad 402 and smartphone 404. The foregoing situation can easily be solved by eliminating the power chord used in the prior art. In an embodiment, wireless power transmission 400 may be carried out using a transmitter 408 and embedding at least one receiver (not shown) within pad 402. Transmitter 408 may provide pockets of energy 410 to embedded receivers which may provide power to inductive elements 406 from pad 402 for powering smartphone 404 wirelessly. Antenna elements 412 (as described with reference to at least one of FIG. 2 and FIG. 3), from the foregoing embedded receivers, may be placed outside the edges of pad 402 for improved power reception independent of the location of transmitter 408. The foregoing configuration may be beneficial because pad 402 may no longer be constrained by the location of a suitable wall outlet. In addition, pad 402 can be put in easy-to-reach locations such as tables, counters and the like that are inside the range of transmitter 408. In some embodiments the range of transmitter 408 can be up to about 15 feet. The foregoing can be achieved by placing about 256 antennas in transmitter 408, and an embedded receiver with about 80 antennas. The power transmitted can be up to one watt.
FIG. 6 illustrates a pad 600 which in this embodiment may include a plurality of inductive elements 406, at least one embedded receiver (not shown) for powering smartphone 404. As described above, with reference to at least one of FIG. 4 and FIG. 5, pad 600 may receive power wireless through pocket-forming and may not require a power chord for connecting to a power supply such as a wall outlet. In some embodiments, pad 600 may also include at least one module 602 for storing charge, for example a lithium ion battery. Module 602 may store charge while charging or not smartphone 404. In some embodiments, pad 600 may utilize magnetic induction, electrodynamics induction of pocket-forming for powering smartphone 404 as described through FIG. 4 and FIG. 5. Once pad 600 is charged, it may be placed at any location, or even carried around for powering electronic devices as described in FIG. 7 below.
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Cooperative Classification H02J50/10, H02J50/80, H02J7/0042, H02J50/20, H02J7/04, H02J7/025, H02J17/00, H02J50/40, H02J50/90