US20240047133A1 - Charging pad and a method for charging one or more receiver devices - Google Patents
Charging pad and a method for charging one or more receiver devices Download PDFInfo
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- US20240047133A1 US20240047133A1 US18/492,358 US202318492358A US2024047133A1 US 20240047133 A1 US20240047133 A1 US 20240047133A1 US 202318492358 A US202318492358 A US 202318492358A US 2024047133 A1 US2024047133 A1 US 2024047133A1
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- 238000000034 method Methods 0.000 title claims description 16
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000012546 transfer Methods 0.000 description 27
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 239000011295 pitch Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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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
- 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
Definitions
- Embodiments of the present invention relate generally to wireless power transfer systems and more particularly to a system and a method for charging at least one receiver device using a single power exchange coil.
- Power transfer system are widely used to transfer power from a power source to one or more receiver devices, such as for example, mobile devices, biomedical devices, and portable consumer devices.
- the power transfer systems may be contact based power transfer systems or wireless power transfer systems.
- wireless power transfer systems are desirable.
- a charging device In wireless power transfer systems, a charging device is used to convert an input power to a transferrable power which is transmitted to charge one or more loads such as batteries in one or more receiver devices.
- the one or more receiver devices are compatible with one or more of the wireless frequency standards.
- the WPC standard Qi
- the PMA standard may be defined in a frequency range of 200 kHz to 400 kHz.
- the A4WP standard may be defined at a frequency of about 7 MHz.
- a conventional charging device transmits the input power at only one frequency standard irrespective of the type of the receiver device.
- a charging pad in accordance with one embodiment of the present invention, includes a power drive unit configured to generate a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Further, the charging pad includes a transmitting unit including a single power exchange coil coupled to the power drive unit.
- the single power exchange coil includes a first coil segment configured to excite at the first frequency to transmit the first AC voltage signal having the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit.
- the single power exchange coil includes a second coil segment configured to excite at the second frequency to transmit the second AC voltage signal having the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit.
- a wireless charging device in accordance with another embodiment of the present invention, includes a charging pad including a power drive unit configured to generate a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Also, the charging pad includes a transmitting unit including a single power exchange coil coupled to the power drive unit. The single power exchange coil includes a first coil segment configured to excite at the first frequency to transmit the first AC voltage signal having the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit. Further, the single power exchange coil includes a second coil segment configured to excite at the second frequency to transmit the second AC voltage signal having the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit. In addition, the wireless charging device includes a control unit operatively coupled to the power drive unit and configured to control a voltage gain of the power drive unit.
- a method for charging at least one receiver device includes generating, by a power drive unit, a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Also, the method includes exciting a first coil segment of a single power exchange coil, at the first frequency, when the first AC voltage signal having the first frequency is received from the power drive unit, to transmit the first AC voltage signal having the first frequency to charge a first receiver device. Further, the method includes exciting a second coil segment of the single power exchange coil, at the second frequency, when the second AC voltage signal having the second frequency is received from the power drive unit, to transmit the second AC voltage signal having the second frequency to charge a second receiver device.
- FIG. 1 is a block diagram representation of a wireless power transfer system in accordance with an embodiment of the present invention
- FIG. 2 is a schematic representation of a wireless power transfer system in accordance with one embodiment of the present invention.
- FIG. 3 is a schematic representation of a wireless power transfer system in accordance with another embodiment of the present invention.
- FIG. 4 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention.
- FIG. 5 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention.
- FIG. 6 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention.
- FIG. 7 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention.
- FIG. 8 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention.
- FIG. 9 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention.
- FIG. 10 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention.
- FIG. 11 is a schematic representation of a wireless power transfer system in accordance with another embodiment of the present invention.
- FIG. 12 is a flow chart illustrating a method for charging one or more receiver devices using a single power exchange coil in accordance with an embodiment of the present invention.
- embodiments of a system and method for charging one or more wireless receiver devices are disclosed.
- embodiments of the system and method disclosed herein employ a single power exchange coil capable of transmitting voltage signals having different frequencies, thereby enabling charging of the one or more wireless receiver devices operating at different frequency standards.
- circuit and “circuitry” and “control unit” may include either a single component or a plurality of components, which are either active and/or passive and are connected or otherwise coupled together to provide the described function.
- operationally coupled includes wired coupling, wireless coupling, electrical coupling, magnetic coupling, radio communication, software based communication, or combinations thereof.
- FIG. 1 is a diagrammatical representation of a wireless power transfer system 100 in accordance with an embodiment of the present invention.
- the wireless power transfer system 100 includes a power source 102 , a wireless charging device 104 , a first receiver device 106 , and a second receiver device 108 .
- the first and second receiver devices 106 , 108 may include mobile devices, biomedical devices, portable consumer devices, or the like.
- receiver devices 106 , 108 may include cell phones, laptops, heating ventilation and air-conditioning (HVAC) units, or the like.
- the wireless charging device 104 is wirelessly coupled to the first receiver device 106 and the second receiver device 108 .
- the wireless charging device 104 is used to transmit electric power from the power source 102 to the first and second receiver devices 106 , 108 .
- the wireless power transfer system 100 may be referred to as a contactless power transfer system.
- the first and second receiver devices 106 , 108 are compatible with one of the wireless frequency standards.
- one of the receiver devices 106 , 108 may be compatible with Alliance for Wireless Power (A4WP) standard defined at a frequency of about 7 MHz.
- another receiver device may be compatible with Wireless Power Consortium (WPC) standard (Qi) defined in a frequency range of 100 kHz to 200 kHz.
- WPC Wireless Power Consortium
- Qi Wireless Power Consortium
- one of the receiver devices 106 , 108 may be compatible with Power Matters Alliance (PMA) standard that is defined in a frequency range of 200 kHz to 400 kHz.
- the other receiver device may be compatible with Air Fuel Alliance standard defined at a frequency of about 6.7 MHz.
- the first receiver device 106 is considered to be compatible with a first frequency standard such as Air Fuel Alliance standard defined at a frequency of about 6.7 MHz.
- the first frequency standard is referred to as a high frequency standard.
- the second receiver device 108 is considered to be compatible with a second frequency standard such as WPC standard defined in a frequency range of 100 kHz to 200 kHz.
- the second frequency standard is referred to as a low frequency standard.
- the receiver devices 106 , 108 may be compatible with any frequency standard and are not limited to the frequency standards mentioned herein. Further, the use of any number of receiver devices that are compatible with any number of frequency standards may be envisioned.
- a charging device may not supply power to each of the receiver devices at the corresponding frequency standard.
- separate charging devices having separate converters and separate power exchange coils for each frequency standard, are employed to supply power to the corresponding receiver device. The use of such separate charging devices for each frequency standard may substantially increase cost of the conventional power transfer systems.
- the exemplary power transfer system 100 includes the wireless charging device 104 that is configured to charge the first and second receiver devices 106 , 108 operable at different corresponding frequency standards.
- the wireless charging device 104 includes a charging pad 130 and a control unit 112 .
- the charging pad 130 is referred to as an electrical enclosure upon which the one or more receiver devices may be placed for charging the one or more receiver devices.
- the control unit 112 may be positioned within the charging pad 130 . In another embodiment, the control unit 112 may be positioned external to the charging pad 130 .
- the control unit 112 is used to drive the charging pad 130 to generate voltage signals having different frequencies.
- the charging pad 130 includes a power drive unit 110 and a transmitting unit 114 .
- the power drive unit 110 is electrically coupled to the power source 102 and the control unit 112 .
- the power source 102 is configured to supply input power having a direct current (DC) voltage signal 115 to the power drive unit 110 .
- the input power may be in a range from about 0.1 W to 200 W.
- the power source 102 may be a part of the wireless charging device 104 .
- the power source 102 may be positioned external to the wireless charging device 104 .
- the control unit 112 is used to control a voltage gain of the power drive unit 110 .
- the power drive unit 110 is configured to generate a first (alternating current) AC voltage signal 116 having the first frequency and a second AC voltage signal 118 having the second frequency.
- the first frequency may be referred to as a frequency in a first frequency band in a range from about 2 MHz to about 9 MHz.
- the second frequency may be referred to as a frequency in the second frequency band in a range from about 10 kHz to about 1 MHz.
- first frequency and “frequency in a first frequency band” may be used interchangeably in the specification.
- second frequency and “frequency in a second frequency band” may be used interchangeably in the specification.
- the power drive unit 110 is further configured to transmit the input power having the first AC voltage signal 116 and the second AC voltage signal 118 to the transmitting unit 114 .
- the transmitting unit 114 includes a single power exchange coil 120 electrically coupled to the power drive unit 110 and inductively coupled to the first and second receiver devices 106 , 108 .
- the single power exchange coil 120 include a plurality of coil segments (shown in FIG. 2 ) disposed one above the other. In another embodiment, the coil segments may be positioned side-by-side.
- the single power exchange coil 120 is used to wirelessly transmit the input power having the first AC voltage signal 116 and the second AC voltage signal 118 to the first and second receiver devices 106 , 108 .
- the first AC voltage signal 116 having the first frequency and the second AC voltage signal 118 having the second frequency is used for charging electric loads 126 , 128 , for example, batteries of the first and second receiver devices 106 , 108 respectively.
- the first receiver device 106 is compatible with the first frequency standard such as Air Fuel Alliance standard
- the first receiver device 106 is configured to receive the first AC voltage signal 116 having the first frequency from one coil segment of the single power exchange coil 120 .
- the second receiver device 108 is compatible with a second frequency standard such as WPC standard
- the second receiver device 108 is configured to receive the second AC voltage signal 118 having the second frequency from another coil segment of the single power exchange coil 120 .
- the first and second receiver devices 106 , 108 may be placed on or proximate to the charging pad 130 for charging the electric loads, 126 , 128 of the first and second receiver devices 106 , 108 respectively.
- the power drive unit 110 includes an oscillating unit 202 and a converting unit 204 .
- the oscillating unit 202 may include one or more oscillators that are pre-tuned or designed to oscillate at a predefined frequency.
- one oscillator is tuned to the first frequency and configured to receive a bias voltage from the power source 102 and oscillate at the first frequency to convert the received bias voltage to the first AC voltage signal 116 having the first frequency.
- another oscillator is tuned to the second frequency and configured to receive a bias voltage from the power source 102 and oscillate at the second frequency to convert the received bias voltage to the second AC voltage signal 118 having the second frequency.
- the oscillators may be piezo-electric oscillators or integrated circuit (IC)-based electronics oscillators.
- the oscillating unit 202 may include other components such as amplifiers and adders (not shown) to combine the first and second AC voltage signals 116 , 118 and send a combined signal to the transmitting unit 114 .
- the control unit 112 is configured to send a control signal 206 to the oscillating unit 202 to control a voltage gain of the oscillating unit 202 .
- the converting unit 204 is configured to generate the first AC voltage signal 116 having the first frequency and the second AC voltage signal 118 having the second frequency.
- the converting unit 204 includes a hybrid (H)-bridge converter (not shown) electrically coupled to the control unit 112 and the power source 102 . If a first frequency control signal 208 is received from the control unit 112 , the H-bridge converter is configured to convert the DC voltage signal 115 of the input power to the first AC voltage signal 116 having the first frequency. If a second frequency control signal 210 is received from the control unit 112 , the H-bridge converter is configured to convert the DC voltage signal 115 of the input power to the second AC voltage signal 118 having the second frequency.
- H hybrid
- the converting unit 204 is configured to transmit the first AC voltage signal 116 having the first frequency and the second AC voltage signal 118 having the second frequency to the transmitting unit 114 .
- the oscillating unit 202 and the converting unit 204 may be combined to form a unit configured to generate the first and second AC voltage signals 116 , 118 .
- the single power exchange coil 120 of the transmitting unit 114 includes a first coil segment 212 and a second coil segment 214 that are inductively coupled to the first and second receiver devices 106 , 108 respectively.
- the single power exchange coil 120 may be tapped at a predetermined location to form the first coil segment 212 and the second coil segment 214 .
- the first coil segment 212 and the second coil segment 214 may include a spiral structure, a helical structure, a conical structure, a log periodic structure, a swiss-roll structure, or a combination thereof.
- a first resonator 218 includes the first coil segment 212 and a first capacitor 216 parallelly coupled to the first coil segment 212 . If the first AC voltage signal 116 is received, the first resonator 218 is configured to resonate at the first frequency to transmit the first AC voltage signal 116 having the first frequency.
- the first capacitor 216 has a capacitance value C 1 and the first coil segment 212 has an inductance value L 1 such that a resonant path 221 is formed to enhance the transmission of the first AC voltage signal 116 to the first receiver device 106 .
- the transmitting unit 114 receives the second AC voltage signal 118 having the second frequency
- the second coil segment 214 of the single power exchange coil 120 is configured to be excited to transmit the second AC voltage signal 118 having the second frequency to the second receiver device 108 .
- a second resonator 222 includes the second coil segment 214 and a second capacitor 220 parallelly coupled to the second coil segment 214 . If second AC voltage signal 118 is received, the second resonator 222 is configured to resonate at the second frequency to transmit the second AC voltage signal 118 having the second frequency.
- the second capacitor 220 has a capacitance value C 2 and the second coil segment 214 has an inductance value L 2 such that a resonant path 224 is formed to enhance the transmission of the second AC voltage signal 118 to the second receiver device 108 .
- the first and second receiver devices 106 , 108 are configured to use the first AC voltage signal 116 having the first frequency and the second AC voltage signal 118 having the second frequency for charging the electric loads 126 , 128 of the first and second receiver devices 106 , 108 respectively.
- the first and second receiver devices 106 , 108 are inductively coupled to the first coil segment 212 and the second coil segment 214 respectively based on the frequency standards for which the first and second receiver devices 106 , 108 are designed. For example, if the first receiver device 106 is configured to be compatible with the first frequency standard such as Air Fuel Alliance standard, a first receiver coil 226 of the first receiver device 106 is configured to receive the first AC voltage signal 116 having the first frequency from the first coil segment 212 .
- a second receiver coil 228 of the second receiver device 108 is configured to receive the second AC voltage signal 118 having the second frequency from the second coil segment 214 .
- the single power exchange coil 120 includes an internal inductance and an internal capacitance that aid in resonating the single power exchange coil 120 at the first frequency to transmit the first AC voltage signal 116 having the first frequency to the first receiver device 106 .
- the internal capacitance may be a parasitic capacitance, a distributed capacitance, or a lumped capacitance.
- the internal inductance and the internal capacitance of the single power exchange coil 120 is referred to as a first resonator.
- the first resonator is configured to resonate at the first frequency to transmit the first AC voltage signal 116 having the first frequency to the first receiver device 106 .
- the single power exchange coil 120 includes an internal capacitance value C 1 and the internal inductance value L 1 such that a resonant path 302 is formed to enhance the transmission of the first AC voltage signal 116 to the first receiver device 106 .
- a coil segment 304 of the single power exchange coil 120 is excited to transmit the second AC voltage signal 118 having the second frequency to the second receiver device 108 .
- the single power exchange coil 120 includes a second resonator 308 having a capacitor 306 parallelly coupled to the coil segment 304 . If the second AC voltage signal 118 is received, the second resonator 308 is configured to resonate at the second frequency to transmit the second AC voltage signal 118 having the second frequency.
- the capacitor 306 has a capacitance value C 2 and the coil segment 304 has an inductance value L 2 such that a resonant path 310 is formed to enhance the transmission of the second AC voltage signal 118 to the second receiver device 108 .
- a schematic representation of a transmitting unit 400 in accordance with another embodiment of the present invention is depicted.
- the transmitting unit 400 is similar to the transmitting unit 114 of FIG. 2 except that the capacitors 216 , 220 are coupled in series with the single power exchange coil 120 .
- a first resonator includes the first coil segment 212 and the first capacitor 216 coupled in series with the first coil segment 212 .
- a second resonator includes the second coil segment 214 and the second capacitor 220 coupled in series with the second coil segment 214 .
- the first resonator resonates at the first frequency to transmit the first AC voltage signal having the first frequency to the first receiver device.
- the second resonator resonates at the second frequency to transmit the second AC voltage signal having the second frequency to the second receiver device.
- FIG. 5 a schematic representation of a transmitting unit 500 in accordance with another embodiment of the present invention is depicted.
- the transmitting unit 500 is similar to the transmitting unit 400 except that the first coil segment 212 and the second coil segment 214 are coupled to each other using an internal capacitance 502 .
- the internal capacitance 502 may be a distributed capacitance or a parasitic capacitance of the single power exchange coil 120 .
- FIG. 6 is a schematic representation of a transmitting unit 600 in accordance with another embodiment of the present invention.
- the transmitting unit 600 includes a single capacitor 602 coupled to the first coil segment 212 and the second coil segment 214 .
- a first resonator includes the first coil segment 212 and the single capacitor 602 coupled to the first coil segment 212 and configured to transmit the first AC voltage signal having the first frequency.
- a second resonator includes the second coil segment 214 and the single capacitor 602 coupled to the second coil segment 214 and configured to transmit the second AC voltage signal having the second frequency.
- the single power exchange coil 700 includes a first coil segment 712 and a second coil segment 714 interwound spirally to form a swiss roll structure. Further, the first coil segment 712 and the second coil segment 714 are coupled to each other using a distributed capacitance 702 .
- the single power exchange coil 800 includes a first coil segment 812 having one end connected to one end of a second coil segment 814 using a capacitor 802 .
- the single power exchange coil 900 includes a first coil segment 912 and a second coil segment 914 that are arranged in the form of logs interwound spirally to form a swiss roll structure.
- the coils segments 912 , 914 are connected to each other using a capacitor 902 .
- the single power exchange coil 1000 includes a first coil segment 1012 and a second coil segment 1014 having different pitches 1002 , 1004 .
- a pitch is defined as a space between the coils segments when the coils segments are interwound spirally to form a swiss roll structure.
- the first and second coil segments 1012 , 1014 have a first pitch P 1 1002 at one end and a second pitch P 2 1004 at another end.
- the first pitch P 1 1002 is less than the second pitch P 2 1004 .
- FIG. 11 a schematic representation of a wireless power transfer system 1100 in accordance with another embodiment of the present invention is depicted.
- the wireless power transfer system 1100 is similar to the wireless power transfer system 100 of FIG. 2 except that the power drive unit 110 includes a drive coil 1102 that is magnetically or electromagnetically coupled to the single power exchange coil 120 of the transmitting unit 114 . More specifically, the drive coil 1102 is coupled to at least one of the oscillating unit 202 and the converting unit 204 of the power drive unit 110 . If the drive coil 1102 transmits the first AC voltage signal having the first frequency, the first coil segment 212 is configured to resonate at the first frequency to transmit the first AC voltage signal to the receiver coil 226 of the first receiver device 106 . If the drive coil 1102 transmits the second voltage signal having the second frequency, the second coil segment 214 is configured to resonate at the second frequency to transmit this second AC voltage signal to the receiver coil 228 of the second receiver device 108 .
- a power drive unit generates a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency.
- the first frequency may be in a range from about 2 MHz to about 9 MHz.
- the second frequency may be in a range from about 10 kHz to about 1 MHz.
- the power drive unit transmits the first AC voltage signal having the first frequency and the second AC voltage signal having the second frequency to a transmitting unit.
- a first coil segment of a single power exchange coil of a transmitting unit is excited at the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit.
- a first resonator includes the first coil segment and a first capacitor coupled parallelly to the first coil segment. Further, if the first AC voltage signal is received, the first resonator resonates at the first frequency to transmit the first AC voltage signal having the first frequency to a first receiver device.
- a second coil segment of the single power exchange coil is excited at the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit.
- a second resonator includes the segment coil segment and a second capacitor coupled parallelly to the second coil segment. If the second AC voltage signal is received, the second resonator resonates at the second frequency to transmit the second AC voltage signal having the second frequency to a second receiver device.
- the exemplary system and method facilitate to charge one or more receiver devices of different frequency standards, using a single power exchange coil of a charging pad. As a result, set-up cost and maintenance cost of the exemplary power transfer system is substantially reduced.
Abstract
A charging pad (130) for charging one or more receiver devices (106, 108) is disclosed. The charging pad (130) includes a power drive unit (110) configured to generate a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Further, the charging pad (130) includes a transmitting unit (114) including a single power exchange coil (120) coupled to the power drive unit (110), wherein the single power exchange coil (120) includes a first coil segment (212) configured to transmit the first AC voltage signal having the first frequency when the first AC voltage signal is received from the power drive unit (110). Also, the single power exchange coil (120) includes a second coil segment (214) configured to transmit the second AC voltage signal having the second frequency when the second AC voltage signal is received from the power drive unit (110).
Description
- This Patent Application is a continuation of U.S. application Ser. No. 17/541,891, filed Dec. 3, 2021, which is a continuation of U.S. application Ser. No. 16/469,538, filed Jun. 13, 2019, which is a national stage of International Application No. PCT/US2017/058641, filed Oct. 27, 2017, and claims the priority benefit of India Patent Application No. 201641042699, filed Dec. 15, 2016. The disclosures of the prior Applications are considered part of and incorporated by reference in this Patent Application.
- Embodiments of the present invention relate generally to wireless power transfer systems and more particularly to a system and a method for charging at least one receiver device using a single power exchange coil.
- Power transfer system are widely used to transfer power from a power source to one or more receiver devices, such as for example, mobile devices, biomedical devices, and portable consumer devices. Typically, the power transfer systems may be contact based power transfer systems or wireless power transfer systems. In certain applications, where instantaneous or continuous power transfer is required but interconnecting wires are inconvenient, wireless power transfer systems are desirable.
- In wireless power transfer systems, a charging device is used to convert an input power to a transferrable power which is transmitted to charge one or more loads such as batteries in one or more receiver devices. The one or more receiver devices are compatible with one or more of the wireless frequency standards. For example, there are currently three competing frequency standards: the Alliance for Wireless Power (A4WP) standard, the Wireless Power Consortium (WPC) standard, and the Power Matters Alliance (PMA) standard. The WPC standard (Qi) may be defined in a frequency range of 100 kHz to 200 kHz. The PMA standard may be defined in a frequency range of 200 kHz to 400 kHz. Further, the A4WP standard may be defined at a frequency of about 7 MHz. A conventional charging device transmits the input power at only one frequency standard irrespective of the type of the receiver device.
- Accordingly, there is a need for an improved system and method for charging one or more receiver devices operating at different frequency standards.
- In accordance with one embodiment of the present invention, a charging pad is disclosed. The charging pad includes a power drive unit configured to generate a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Further, the charging pad includes a transmitting unit including a single power exchange coil coupled to the power drive unit. The single power exchange coil includes a first coil segment configured to excite at the first frequency to transmit the first AC voltage signal having the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit. Also, the single power exchange coil includes a second coil segment configured to excite at the second frequency to transmit the second AC voltage signal having the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit.
- In accordance with another embodiment of the present invention, a wireless charging device is disclosed. The wireless charging device includes a charging pad including a power drive unit configured to generate a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Also, the charging pad includes a transmitting unit including a single power exchange coil coupled to the power drive unit. The single power exchange coil includes a first coil segment configured to excite at the first frequency to transmit the first AC voltage signal having the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit. Further, the single power exchange coil includes a second coil segment configured to excite at the second frequency to transmit the second AC voltage signal having the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit. In addition, the wireless charging device includes a control unit operatively coupled to the power drive unit and configured to control a voltage gain of the power drive unit.
- In accordance with another embodiment of the present invention, a method for charging at least one receiver device is disclosed. The method includes generating, by a power drive unit, a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. Also, the method includes exciting a first coil segment of a single power exchange coil, at the first frequency, when the first AC voltage signal having the first frequency is received from the power drive unit, to transmit the first AC voltage signal having the first frequency to charge a first receiver device. Further, the method includes exciting a second coil segment of the single power exchange coil, at the second frequency, when the second AC voltage signal having the second frequency is received from the power drive unit, to transmit the second AC voltage signal having the second frequency to charge a second receiver device.
- These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
-
FIG. 1 is a block diagram representation of a wireless power transfer system in accordance with an embodiment of the present invention; -
FIG. 2 is a schematic representation of a wireless power transfer system in accordance with one embodiment of the present invention; -
FIG. 3 is a schematic representation of a wireless power transfer system in accordance with another embodiment of the present invention; -
FIG. 4 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention; -
FIG. 5 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention; -
FIG. 6 is a schematic representation of a transmitting unit in accordance with another embodiment of the present invention; -
FIG. 7 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention; -
FIG. 8 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention; -
FIG. 9 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention; -
FIG. 10 is a diagrammatical representation of a single power exchange coil in accordance with another embodiment of the present invention; -
FIG. 11 is a schematic representation of a wireless power transfer system in accordance with another embodiment of the present invention; and -
FIG. 12 is a flow chart illustrating a method for charging one or more receiver devices using a single power exchange coil in accordance with an embodiment of the present invention. - As will be described in detail hereinafter, various embodiments of a system and method for charging one or more wireless receiver devices are disclosed. In particular, embodiments of the system and method disclosed herein employ a single power exchange coil capable of transmitting voltage signals having different frequencies, thereby enabling charging of the one or more wireless receiver devices operating at different frequency standards.
- Unless defined otherwise, technical and scientific terms used herein have the same meaning as is commonly understood by one of ordinary skill in the art to which this specification belongs. The terms “first”, “second”, and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The use of terms “including,” “comprising” or “having” and variations thereof herein are meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms “connected” and “coupled” are not restricted to physical or mechanical connections or couplings, and can include electrical connections or couplings, whether direct or indirect. Furthermore, terms “circuit” and “circuitry” and “control unit” may include either a single component or a plurality of components, which are either active and/or passive and are connected or otherwise coupled together to provide the described function. In addition, the term operationally coupled as used herein includes wired coupling, wireless coupling, electrical coupling, magnetic coupling, radio communication, software based communication, or combinations thereof.
-
FIG. 1 is a diagrammatical representation of a wirelesspower transfer system 100 in accordance with an embodiment of the present invention. The wirelesspower transfer system 100 includes apower source 102, awireless charging device 104, afirst receiver device 106, and asecond receiver device 108. The first andsecond receiver devices receiver devices wireless charging device 104 is wirelessly coupled to thefirst receiver device 106 and thesecond receiver device 108. Thewireless charging device 104 is used to transmit electric power from thepower source 102 to the first andsecond receiver devices power transfer system 100 may be referred to as a contactless power transfer system. - The first and
second receiver devices receiver devices receiver devices first receiver device 106 is considered to be compatible with a first frequency standard such as Air Fuel Alliance standard defined at a frequency of about 6.7 MHz. The first frequency standard is referred to as a high frequency standard. Similarly, thesecond receiver device 108 is considered to be compatible with a second frequency standard such as WPC standard defined in a frequency range of 100 kHz to 200 kHz. The second frequency standard is referred to as a low frequency standard. It should be noted herein that thereceiver devices - In conventional power transfer systems that are compatible with different frequency standards, a charging device may not supply power to each of the receiver devices at the corresponding frequency standard. In one of the conventional power transfer systems, separate charging devices having separate converters and separate power exchange coils for each frequency standard, are employed to supply power to the corresponding receiver device. The use of such separate charging devices for each frequency standard may substantially increase cost of the conventional power transfer systems.
- To overcome the problems/drawbacks associated with the conventional systems, the exemplary
power transfer system 100 includes thewireless charging device 104 that is configured to charge the first andsecond receiver devices wireless charging device 104 includes acharging pad 130 and acontrol unit 112. Thecharging pad 130 is referred to as an electrical enclosure upon which the one or more receiver devices may be placed for charging the one or more receiver devices. In one embodiment, thecontrol unit 112 may be positioned within thecharging pad 130. In another embodiment, thecontrol unit 112 may be positioned external to thecharging pad 130. Thecontrol unit 112 is used to drive thecharging pad 130 to generate voltage signals having different frequencies. - Further, the
charging pad 130 includes apower drive unit 110 and a transmittingunit 114. Thepower drive unit 110 is electrically coupled to thepower source 102 and thecontrol unit 112. Thepower source 102 is configured to supply input power having a direct current (DC)voltage signal 115 to thepower drive unit 110. In some embodiments, the input power may be in a range from about 0.1 W to 200 W. In one embodiment, thepower source 102 may be a part of thewireless charging device 104. In another embodiment, thepower source 102 may be positioned external to thewireless charging device 104. Further, thecontrol unit 112 is used to control a voltage gain of thepower drive unit 110. - The
power drive unit 110 is configured to generate a first (alternating current)AC voltage signal 116 having the first frequency and a secondAC voltage signal 118 having the second frequency. It may be noted that the first frequency may be referred to as a frequency in a first frequency band in a range from about 2 MHz to about 9 MHz. The second frequency may be referred to as a frequency in the second frequency band in a range from about 10 kHz to about 1 MHz. Also, it may be noted that the terms “first frequency” and “frequency in a first frequency band” may be used interchangeably in the specification. Similarly, the terms “second frequency” and “frequency in a second frequency band” may be used interchangeably in the specification. - The
power drive unit 110 is further configured to transmit the input power having the firstAC voltage signal 116 and the secondAC voltage signal 118 to the transmittingunit 114. In the exemplary embodiment, the transmittingunit 114 includes a singlepower exchange coil 120 electrically coupled to thepower drive unit 110 and inductively coupled to the first andsecond receiver devices power exchange coil 120 include a plurality of coil segments (shown inFIG. 2 ) disposed one above the other. In another embodiment, the coil segments may be positioned side-by-side. The singlepower exchange coil 120 is used to wirelessly transmit the input power having the firstAC voltage signal 116 and the secondAC voltage signal 118 to the first andsecond receiver devices - Further, the first
AC voltage signal 116 having the first frequency and the secondAC voltage signal 118 having the second frequency is used for chargingelectric loads second receiver devices first receiver device 106 is compatible with the first frequency standard such as Air Fuel Alliance standard, thefirst receiver device 106 is configured to receive the firstAC voltage signal 116 having the first frequency from one coil segment of the singlepower exchange coil 120. Similarly, if thesecond receiver device 108 is compatible with a second frequency standard such as WPC standard, thesecond receiver device 108 is configured to receive the secondAC voltage signal 118 having the second frequency from another coil segment of the singlepower exchange coil 120. The first andsecond receiver devices charging pad 130 for charging the electric loads, 126, 128 of the first andsecond receiver devices - Referring to
FIG. 2 , a detailed schematic representation of the wirelesspower transfer system 100 in accordance with an embodiment of the present invention is depicted. Thepower drive unit 110 includes anoscillating unit 202 and a convertingunit 204. In one embodiment, theoscillating unit 202 may include one or more oscillators that are pre-tuned or designed to oscillate at a predefined frequency. For example, one oscillator is tuned to the first frequency and configured to receive a bias voltage from thepower source 102 and oscillate at the first frequency to convert the received bias voltage to the firstAC voltage signal 116 having the first frequency. Similarly, another oscillator is tuned to the second frequency and configured to receive a bias voltage from thepower source 102 and oscillate at the second frequency to convert the received bias voltage to the secondAC voltage signal 118 having the second frequency. In certain embodiments, the oscillators may be piezo-electric oscillators or integrated circuit (IC)-based electronics oscillators. In some embodiments, theoscillating unit 202 may include other components such as amplifiers and adders (not shown) to combine the first and second AC voltage signals 116, 118 and send a combined signal to the transmittingunit 114. Further, thecontrol unit 112 is configured to send acontrol signal 206 to theoscillating unit 202 to control a voltage gain of theoscillating unit 202. - In another embodiment, the converting
unit 204 is configured to generate the firstAC voltage signal 116 having the first frequency and the secondAC voltage signal 118 having the second frequency. In one embodiment, the convertingunit 204 includes a hybrid (H)-bridge converter (not shown) electrically coupled to thecontrol unit 112 and thepower source 102. If a firstfrequency control signal 208 is received from thecontrol unit 112, the H-bridge converter is configured to convert theDC voltage signal 115 of the input power to the firstAC voltage signal 116 having the first frequency. If a secondfrequency control signal 210 is received from thecontrol unit 112, the H-bridge converter is configured to convert theDC voltage signal 115 of the input power to the secondAC voltage signal 118 having the second frequency. Further, the convertingunit 204 is configured to transmit the firstAC voltage signal 116 having the first frequency and the secondAC voltage signal 118 having the second frequency to the transmittingunit 114. In some embodiments, theoscillating unit 202 and the convertingunit 204 may be combined to form a unit configured to generate the first and second AC voltage signals 116, 118. - In the illustrated embodiment, the single
power exchange coil 120 of the transmittingunit 114 includes afirst coil segment 212 and asecond coil segment 214 that are inductively coupled to the first andsecond receiver devices power exchange coil 120 may be tapped at a predetermined location to form thefirst coil segment 212 and thesecond coil segment 214. In another embodiment, thefirst coil segment 212 and thesecond coil segment 214 may include a spiral structure, a helical structure, a conical structure, a log periodic structure, a swiss-roll structure, or a combination thereof. - If the transmitting
unit 114 receives the firstAC voltage signal 116 having the first frequency, thefirst coil segment 212 of the singlepower exchange coil 120 is configured to be excited to transmit the firstAC voltage signal 116 having the first frequency to thefirst receiver device 106. In the illustrated embodiment, afirst resonator 218 includes thefirst coil segment 212 and afirst capacitor 216 parallelly coupled to thefirst coil segment 212. If the firstAC voltage signal 116 is received, thefirst resonator 218 is configured to resonate at the first frequency to transmit the firstAC voltage signal 116 having the first frequency. In one embodiment, thefirst capacitor 216 has a capacitance value C1 and thefirst coil segment 212 has an inductance value L1 such that aresonant path 221 is formed to enhance the transmission of the firstAC voltage signal 116 to thefirst receiver device 106. - If the transmitting
unit 114 receives the secondAC voltage signal 118 having the second frequency, thesecond coil segment 214 of the singlepower exchange coil 120 is configured to be excited to transmit the secondAC voltage signal 118 having the second frequency to thesecond receiver device 108. In the illustrated embodiment, asecond resonator 222 includes thesecond coil segment 214 and asecond capacitor 220 parallelly coupled to thesecond coil segment 214. If secondAC voltage signal 118 is received, thesecond resonator 222 is configured to resonate at the second frequency to transmit the secondAC voltage signal 118 having the second frequency. In one embodiment, thesecond capacitor 220 has a capacitance value C2 and thesecond coil segment 214 has an inductance value L2 such that a resonant path 224 is formed to enhance the transmission of the secondAC voltage signal 118 to thesecond receiver device 108. - The first and
second receiver devices AC voltage signal 116 having the first frequency and the secondAC voltage signal 118 having the second frequency for charging theelectric loads second receiver devices second receiver devices first coil segment 212 and thesecond coil segment 214 respectively based on the frequency standards for which the first andsecond receiver devices first receiver device 106 is configured to be compatible with the first frequency standard such as Air Fuel Alliance standard, afirst receiver coil 226 of thefirst receiver device 106 is configured to receive the firstAC voltage signal 116 having the first frequency from thefirst coil segment 212. Similarly, if thesecond receiver device 108 is configured to be compatible with the second frequency standard such as WPC standard, asecond receiver coil 228 of thesecond receiver device 108 is configured to receive the secondAC voltage signal 118 having the second frequency from thesecond coil segment 214. - Referring to
FIG. 3 , a schematic representation of a wirelesspower transfer system 300 in accordance with another embodiment of the present invention, is depicted. Particularly, the singlepower exchange coil 120 includes an internal inductance and an internal capacitance that aid in resonating the singlepower exchange coil 120 at the first frequency to transmit the firstAC voltage signal 116 having the first frequency to thefirst receiver device 106. The internal capacitance may be a parasitic capacitance, a distributed capacitance, or a lumped capacitance. In the illustrated embodiment, the internal inductance and the internal capacitance of the singlepower exchange coil 120 is referred to as a first resonator. If the transmittingunit 114 receives the firstAC voltage signal 116 having the first frequency, the first resonator is configured to resonate at the first frequency to transmit the firstAC voltage signal 116 having the first frequency to thefirst receiver device 106. The singlepower exchange coil 120 includes an internal capacitance value C1 and the internal inductance value L1 such that aresonant path 302 is formed to enhance the transmission of the firstAC voltage signal 116 to thefirst receiver device 106. - In the illustrated embodiment, a
coil segment 304 of the singlepower exchange coil 120 is excited to transmit the secondAC voltage signal 118 having the second frequency to thesecond receiver device 108. The singlepower exchange coil 120 includes asecond resonator 308 having acapacitor 306 parallelly coupled to thecoil segment 304. If the secondAC voltage signal 118 is received, thesecond resonator 308 is configured to resonate at the second frequency to transmit the secondAC voltage signal 118 having the second frequency. Thecapacitor 306 has a capacitance value C2 and thecoil segment 304 has an inductance value L2 such that a resonant path 310 is formed to enhance the transmission of the secondAC voltage signal 118 to thesecond receiver device 108. - Referring to
FIG. 4 , a schematic representation of a transmittingunit 400 in accordance with another embodiment of the present invention is depicted. The transmittingunit 400 is similar to the transmittingunit 114 ofFIG. 2 except that thecapacitors power exchange coil 120. In particular, a first resonator includes thefirst coil segment 212 and thefirst capacitor 216 coupled in series with thefirst coil segment 212. Similarly, a second resonator includes thesecond coil segment 214 and thesecond capacitor 220 coupled in series with thesecond coil segment 214. The first resonator resonates at the first frequency to transmit the first AC voltage signal having the first frequency to the first receiver device. Similarly, the second resonator resonates at the second frequency to transmit the second AC voltage signal having the second frequency to the second receiver device. - Referring to
FIG. 5 , a schematic representation of a transmittingunit 500 in accordance with another embodiment of the present invention is depicted. The transmittingunit 500 is similar to the transmittingunit 400 except that thefirst coil segment 212 and thesecond coil segment 214 are coupled to each other using aninternal capacitance 502. Theinternal capacitance 502 may be a distributed capacitance or a parasitic capacitance of the singlepower exchange coil 120. -
FIG. 6 is a schematic representation of a transmittingunit 600 in accordance with another embodiment of the present invention. The transmittingunit 600 includes asingle capacitor 602 coupled to thefirst coil segment 212 and thesecond coil segment 214. In the illustrated embodiment, a first resonator includes thefirst coil segment 212 and thesingle capacitor 602 coupled to thefirst coil segment 212 and configured to transmit the first AC voltage signal having the first frequency. A second resonator includes thesecond coil segment 214 and thesingle capacitor 602 coupled to thesecond coil segment 214 and configured to transmit the second AC voltage signal having the second frequency. - Referring to
FIG. 7 , a diagrammatical representation of a singlepower exchange coil 700 in accordance with another embodiment of the present invention is depicted. The singlepower exchange coil 700 includes afirst coil segment 712 and asecond coil segment 714 interwound spirally to form a swiss roll structure. Further, thefirst coil segment 712 and thesecond coil segment 714 are coupled to each other using a distributedcapacitance 702. - Referring to
FIG. 8 , a diagrammatical representation of a singlepower exchange coil 120 in accordance with another embodiment of the present invention is depicted. The singlepower exchange coil 800 includes afirst coil segment 812 having one end connected to one end of asecond coil segment 814 using acapacitor 802. - Referring to
FIG. 9 , a diagrammatical representation of a singlepower exchange coil 900 in accordance with another embodiment of the present invention is depicted. The singlepower exchange coil 900 includes afirst coil segment 912 and asecond coil segment 914 that are arranged in the form of logs interwound spirally to form a swiss roll structure. Thecoils segments capacitor 902. - Referring to
FIG. 10 , a diagrammatical representation of a singlepower exchange coil 1000 in accordance with another embodiment of the present invention is depicted. The singlepower exchange coil 1000 includes afirst coil segment 1012 and asecond coil segment 1014 havingdifferent pitches second coil segments first pitch P 1 1002 at one end and asecond pitch P 2 1004 at another end. Thefirst pitch P 1 1002 is less than thesecond pitch P 2 1004. - Referring to
FIG. 11 , a schematic representation of a wirelesspower transfer system 1100 in accordance with another embodiment of the present invention is depicted. The wirelesspower transfer system 1100 is similar to the wirelesspower transfer system 100 ofFIG. 2 except that thepower drive unit 110 includes adrive coil 1102 that is magnetically or electromagnetically coupled to the singlepower exchange coil 120 of the transmittingunit 114. More specifically, thedrive coil 1102 is coupled to at least one of theoscillating unit 202 and the convertingunit 204 of thepower drive unit 110. If thedrive coil 1102 transmits the first AC voltage signal having the first frequency, thefirst coil segment 212 is configured to resonate at the first frequency to transmit the first AC voltage signal to thereceiver coil 226 of thefirst receiver device 106. If thedrive coil 1102 transmits the second voltage signal having the second frequency, thesecond coil segment 214 is configured to resonate at the second frequency to transmit this second AC voltage signal to thereceiver coil 228 of thesecond receiver device 108. - Referring to
FIG. 12 , a flow chart illustrating amethod 1200 for charging one or more receiver devices, using a single power exchange coil in accordance with an embodiment of the present invention is depicted. Atstep 1202, a power drive unit generates a first AC voltage signal having a first frequency and a second AC voltage signal having a second frequency. In one embodiment, the first frequency may be in a range from about 2 MHz to about 9 MHz. The second frequency may be in a range from about 10 kHz to about 1 MHz. Further, the power drive unit transmits the first AC voltage signal having the first frequency and the second AC voltage signal having the second frequency to a transmitting unit. - Further, at
step 1204, a first coil segment of a single power exchange coil of a transmitting unit is excited at the first frequency when the first AC voltage signal having the first frequency is received from the power drive unit. Particularly, a first resonator includes the first coil segment and a first capacitor coupled parallelly to the first coil segment. Further, if the first AC voltage signal is received, the first resonator resonates at the first frequency to transmit the first AC voltage signal having the first frequency to a first receiver device. - At
step 1206, a second coil segment of the single power exchange coil is excited at the second frequency when the second AC voltage signal having the second frequency is received from the power drive unit. Particularly, a second resonator includes the segment coil segment and a second capacitor coupled parallelly to the second coil segment. If the second AC voltage signal is received, the second resonator resonates at the second frequency to transmit the second AC voltage signal having the second frequency to a second receiver device. - In accordance with the exemplary embodiments discussed herein, the exemplary system and method facilitate to charge one or more receiver devices of different frequency standards, using a single power exchange coil of a charging pad. As a result, set-up cost and maintenance cost of the exemplary power transfer system is substantially reduced.
- While only certain features of the present disclosure have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the present disclosure.
Claims (18)
1. A wireless charging device comprising:
a power drive unit capable of generating
a first AC voltage signal having a first frequency according to a high frequency standard or
a second AC voltage signal having a second frequency according to a low frequency standard; and a transmitting unit comprising a power exchange coil coupled to the power drive unit, the power exchange coil configured to:
resonate at the first frequency to transmit the first AC voltage signal according to the high frequency standard when the transmitting unit receives the first AC voltage signal; and
resonate at the second frequency to transmit the second AC voltage signal according to the low frequency standard when the transmitting unit receives the second AC voltage signal.
2. The wireless charging device of claim 1 , wherein the transmitting unit further comprises
a first resonator comprising a first coil segment and a first capacitor coupled to the first coil segment, wherein the first resonator is configured to resonate at the first frequency; and
a second resonator comprising a second coil segment and a second capacitor coupled to the second coil segment, wherein the second resonator is configured to resonate at the second frequency.
3. The wireless charging device of claim 1 , wherein the power exchange coil includes a first coil segment that is configured to inductively transmit the first AC voltage signal having the first frequency to a first receiver device according to the high frequency standard.
4. The wireless charging device of claim 3 , wherein the power exchange coil includes a second coil segment that is configured to inductively transmit the second AC voltage signal having the second frequency to a second receiver device according to the low frequency standard.
5. The wireless charging device of claim 1 , wherein the power exchange coil includes:
a first coil segment that has a first internal capacitance and a first internal inductance such that the first coil segment is configured to resonate at the first frequency; and
a second coil segment that has a second internal capacitance and a second internal inductance such that the second coil segment is configured to resonate at the second frequency.
6. The wireless charging device of claim 1 , wherein the power exchange coil includes at least a first coil segment and a second coil segment, and wherein the first coil segment and the second coil segment are interwound spirally to form a swiss roll structure.
7. The wireless charging device of claim 11 , further comprising:
a control unit operatively coupled to the power drive unit and configured to control the power drive unit according to the high frequency standard or the low frequency standard.
8. The wireless charging device of claim 7 , wherein the control unit is further configured to send at least one of a first frequency control signal and a second frequency control signal to the power drive unit.
9. The wireless charging device f claim 8 , wherein the power drive unit comprises a converting unit configured to:
convert a DC voltage signal of an input power to the first AC voltage signal having the first frequency if the first frequency control signal is received from the control unit; and
convert the DC voltage signal of the input power to the second AC voltage signal having the second frequency if the second frequency control signal is received from the control unit.
10. The wireless charging device of claim 1 , wherein the power drive unit comprises an oscillating unit configured to generate the first AC voltage signal having the first frequency or the second AC voltage signal having the second frequency.
11. The wireless charging device of claim 10 , wherein the oscillating unit includes:
a first oscillator tuned to the first frequency; and
a second oscillator tuned to the second frequency.
12. The wireless charging device of claim 1 , wherein the power drive unit and the transmitting unit are constructed in a common charging pad, the charging pad capable of transmitting power according to both the high frequency standard and the low frequency standard depending on which frequency standard is compatible with a particular receiver device.
13. The wireless charging device of claim 1 ,
wherein the high frequency standard defines a frequency range over 200 kHz; and
wherein the low frequency standard defines a frequency range below 200 kHz.
14. The wireless charging device of claim 1 , wherein the power drive unit comprises a drive coil magnetically coupled to the power exchange coil of the transmitting unit.
15. A method of a wireless charging device, comprising:
generating, by a power drive unit (110), either or both of a first AC voltage signal having a first frequency according to a high frequency standard or a second AC voltage signal having a second frequency according to a low frequency standard; and
transmitting, via a power exchange coil coupled to the power drive unit, either or both of the first AC voltage signal or the second AC voltage signal, wherein transmitting includes the power exchange coil:
resonating at the first frequency to transmit the first AC voltage signal according to the high frequency standard when the transmitting unit receives the first AC voltage signal, and
resonating at the second frequency to transmit the second AC voltage signal according to the low frequency standard when the transmitting unit receives the second AC voltage signal.
16. The method of claim 15 , wherein the power exchange coil includes a first coil segment that is configured to inductively transmit the first AC voltage signal having the first frequency to a first receiver device according to the high frequency standard, and
a second coil segment that is configured to inductively transmit the second AC voltage signal having the second frequency to a second receiver device according to the low frequency standard.
17. The method of claim 15 , further comprising:
controlling, via a control unit, the power drive unit according to the high frequency standard or the low frequency standard.
18. The method of claim 17 , wherein controlling the power drive unit includes
sending at least one of a first frequency control signal and a second frequency control signal from the control unit to the power drive unit.
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US18/492,358 US20240047133A1 (en) | 2016-12-15 | 2023-10-23 | Charging pad and a method for charging one or more receiver devices |
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US201916469538A | 2019-06-13 | 2019-06-13 | |
US17/541,891 US11798737B2 (en) | 2016-12-15 | 2021-12-03 | Charging pad and a method for charging one or more receiver devices |
US18/492,358 US20240047133A1 (en) | 2016-12-15 | 2023-10-23 | Charging pad and a method for charging one or more receiver devices |
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WO2018111416A1 (en) | 2016-12-15 | 2018-06-21 | General Electric Company | A charging pad and a method for charging one or more receiver devices |
US20200274390A1 (en) * | 2017-04-14 | 2020-08-27 | General Electric Company | A wireless power transceiver device and an associates method thereof |
US11431196B2 (en) * | 2017-12-01 | 2022-08-30 | Auckland Uniservices Limited | Misalignment tolerant hybrid wireless power transfer system |
KR102574119B1 (en) * | 2018-07-03 | 2023-09-05 | 삼성전자주식회사 | Electronic device and method for controlling multi wireless transmitting power based on states of a plurality of external electronic devices |
CN110095049B (en) * | 2019-06-13 | 2021-09-03 | 美芯晟科技(北京)有限公司 | Charging alignment detection circuit, electronic device and charging alignment detection method |
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JP3363341B2 (en) * | 1997-03-26 | 2003-01-08 | 松下電工株式会社 | Non-contact power transmission device |
FR2790328B1 (en) * | 1999-02-26 | 2001-04-20 | Memscap | INDUCTIVE COMPONENT, INTEGRATED TRANSFORMER, IN PARTICULAR INTENDED TO BE INCORPORATED IN A RADIOFREQUENCY CIRCUIT, AND INTEGRATED CIRCUIT ASSOCIATED WITH SUCH AN INDUCTIVE COMPONENT OR INTEGRATED TRANSFORMER |
EP2416470B1 (en) * | 2009-03-30 | 2019-11-13 | Fujitsu Limited | Wireless power supply system, wireless power transmission device, and wireless power receiving device |
JP5554937B2 (en) * | 2009-04-22 | 2014-07-23 | パナソニック株式会社 | Contactless power supply system |
US8842410B2 (en) * | 2009-08-31 | 2014-09-23 | Qualcomm Incorporated | Switchable inductor network |
KR101951358B1 (en) | 2011-12-15 | 2019-02-22 | 삼성전자주식회사 | Wireless power transmitter, wireless power receiver and method for controlling each thereof |
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US10044234B2 (en) | 2013-05-31 | 2018-08-07 | Nokia Technologies Oy | Multi-coil wireless power apparatus |
FR3010252B1 (en) | 2013-08-30 | 2015-08-21 | Continental Automotive France | BI-MODE MAGNETIC COUPLING CHARGE DEVICE AND METHOD FOR MOTOR VEHICLE |
US10170933B2 (en) * | 2013-11-20 | 2019-01-01 | Samsung Electro-Mechanics Co., Ltd. | Non-contact type power supplying apparatus and non-contact type power supplying method |
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US20160164332A1 (en) * | 2014-12-04 | 2016-06-09 | Intel Corporation | Tiled wireless charging coil solution for extended active area |
KR20160129674A (en) * | 2015-04-30 | 2016-11-09 | 제이터치 코포레이션 | Flexible and retractable wireless charging device |
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WO2018111416A1 (en) | 2016-12-15 | 2018-06-21 | General Electric Company | A charging pad and a method for charging one or more receiver devices |
US11081900B2 (en) * | 2016-12-15 | 2021-08-03 | General Electric Company | Charging pads and methods for charging receiver devices having different frequency standards |
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US11798737B2 (en) | 2023-10-24 |
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