Input power appraisal based wireless power system
First Claim
1. A wireless power transmitter comprising:
- a power inverter configured to wirelessly transmit power to a wireless power receiver, and a power appraiser circuit configured to ascertain maximum input power available to said power inverter from one or more of a plurality of said input power sources, said wireless power transmitter configured to select the input power source that best satisfies a power requirement of said wireless power receiver;
wherein, by ascertaining said maximum input power available from said one or more of said plurality of input power sources and selecting the input power source that best satisfies said power requirement of said wireless power receiver, said wireless power transmitter is able to transmit power to said wireless power receiver in a stable manner.
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Abstract
A wireless power system (WPS) has a wireless power transmitter (WPT) that appraises an input power available to a power inverter from one or more input power sources. The WPT comprises the power inverter that wirelessly transmits power to a wireless power receiver (WPR) of the WPS, and a power appraiser circuit (PAC). The PAC ascertains maximum input power available to the power inverter from the input power sources. The PAC includes a variable load connected to a path carrying the input power to the power inverter or one or more input pins that receive power ratings of the input power sources that indicate available maximum input power from the input power sources. The ascertaining of maximum input power available to the power inverter from the input power sources appraises the input power available to the power inverter. The WPR receives information representing maximum power deliverable by the WPT.
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Citations
16 Claims
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1. A wireless power transmitter comprising:
- a power inverter configured to wirelessly transmit power to a wireless power receiver, and a power appraiser circuit configured to ascertain maximum input power available to said power inverter from one or more of a plurality of said input power sources, said wireless power transmitter configured to select the input power source that best satisfies a power requirement of said wireless power receiver;
wherein, by ascertaining said maximum input power available from said one or more of said plurality of input power sources and selecting the input power source that best satisfies said power requirement of said wireless power receiver, said wireless power transmitter is able to transmit power to said wireless power receiver in a stable manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a power inverter configured to wirelessly transmit power to a wireless power receiver, and a power appraiser circuit configured to ascertain maximum input power available to said power inverter from one or more of a plurality of said input power sources, said wireless power transmitter configured to select the input power source that best satisfies a power requirement of said wireless power receiver;
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11. A wireless power receiver configured to receive an information message representing one of maximum power that said wireless power receiver can deliver to a load and maximum power that a wireless power transmitter can deliver to said wireless power receiver, said wireless power receiver comprising:
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a power output circuitry configurable by said wireless power receiver to deliver power to said load not exceeding a certain maximum limit, wherein said wireless power receiver determines the maximum amount of power that it can deliver to said load based on said received information message, configures said power output circuitry to deliver power to said load not exceeding said determined maximum amount of power, and delivers power received from said wireless power transmitter to said load in a stable manner. - View Dependent Claims (12, 13)
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14. A method for establishing a stable power transfer from a wireless power transmitter to a wireless power receiver, said method comprising:
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providing said wireless power transmitter comprising; a power inverter configured to wirelessly transmit power to said wireless power receiver; and a power appraiser circuit configured to ascertain maximum input power available to said power inverter from a plurality of input power sources; appraising maximum power capability of each of said input power sources by said power appraiser circuit of said wireless power transmitter; detecting said wireless power receiver proximal to said wireless power transmitter; transmitting a minimum power to said wireless power receiver on said detection of said wireless power receiver by said wireless power transmitter, for powering said wireless power receiver and initiating communication with said wireless power transmitter, wherein said wireless power receiver communicates configuration information of said wireless power receiver to said wireless power transmitter via a communication link established between said wireless power transmitter and said wireless power receiver; identifying one of said input power sources providing sufficient power to match an optimal operation requirement of said wireless power receiver obtained from said configuration information of said wireless power receiver by said wireless power transmitter; communicating with said wireless power receiver by said wireless power transmitter based on said identification, comprising one of; transmitting, on a successful said identification of said one of said input power sources, an information message indicating said match to said wireless power receiver; and transmitting, on an unsuccessful said identification of said one of said input power sources, an update message containing a sub-optimal but operationally stable limit, based on a closest match to said optimal operation requirement of said wireless power receiver, by said wireless power transmitter to said wireless power receiver, wherein said wireless power receiver reconfigures said maximum output power limit based on said operationally stable limit contained in said update message from the said wireless power transmitter and transmits an acknowledgement message to the said wireless power transmitter; and transmitting an indication to draw power within said reconfigured maximum output power limit of said wireless power receiver to said wireless power receiver by said wireless power transmitter to establish said stable power transfer. - View Dependent Claims (15, 16)
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Specification