Wireless inductive power transfer with temperature control of the receiver
First Claim
1. A wireless power transfer system including a power transmitter and a power receiver, the power transmitter being arranged to generate a wireless inductive power transfer signal for powering the power receiver, the wireless power transfer system comprising:
- a receiver for receiving a first temperature for a first part of a powered device, the powered device comprising a heating part arranged to be heated by power from the power transfer signal and the first part being a contact surface of the powered device for contacting the power transmitter;
a comparator for comparing the first temperature to a first reference temperature, the first reference temperature being indicative of a maximum allowable contact temperature for a surface of the power transmitter for receiving the power receiver; and
a controller for at least one of restricting the power of the power transfer signal and generating a user alert in response to the first temperature exceeding the first reference temperature; and
whereinthe power receiver comprisesa first temperature sensor for determining a second temperature for a heating part of the powered device,a transmitter for transmitting power control loop feedback messages for requesting power level changes of the power transfer signal to the power transmitter during power transfer, anda power controller for generating power change requests for the power control loop feedback messages in response to the second temperature.
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Accused Products
Abstract
A wireless power transfer system comprises a power transmitter (101) arranged to generate a wireless inductive power transfer signal for powering a power receiver (105). The system comprises a temperature controlled power loop setting an operating temperature for a heating part of a powered device. The system further comprises a receiver (207) for receiving a first temperature for a part of a powered device where the powered device is powered by the power receiver (105). A comparator (209) compares the measured temperature to a first reference temperature associated with the power transmitter (101). In response to the first temperature exceeding the reference temperature, a controller (213) proceeds to restrict the power of the power transfer signal and/or to generate a user alert. The first temperature may specifically relate to a contact surface of the powered device and the reference temperature may be a maximum allowable temperature of a contact surface for receiving the powered device during power transfer.
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Citations
17 Claims
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1. A wireless power transfer system including a power transmitter and a power receiver, the power transmitter being arranged to generate a wireless inductive power transfer signal for powering the power receiver, the wireless power transfer system comprising:
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a receiver for receiving a first temperature for a first part of a powered device, the powered device comprising a heating part arranged to be heated by power from the power transfer signal and the first part being a contact surface of the powered device for contacting the power transmitter; a comparator for comparing the first temperature to a first reference temperature, the first reference temperature being indicative of a maximum allowable contact temperature for a surface of the power transmitter for receiving the power receiver; and a controller for at least one of restricting the power of the power transfer signal and generating a user alert in response to the first temperature exceeding the first reference temperature; and
whereinthe power receiver comprises a first temperature sensor for determining a second temperature for a heating part of the powered device, a transmitter for transmitting power control loop feedback messages for requesting power level changes of the power transfer signal to the power transmitter during power transfer, and a power controller for generating power change requests for the power control loop feedback messages in response to the second temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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12. A power receiver for a wireless power transfer system including a power transmitter arranged to generate a wireless inductive power transfer signal for powering the power receiver, the power receiver comprising:
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a receiver for receiving a first temperature for a first part of a powered device, the powered device comprising a heating part arranged to be heated by power from the power transfer signal and the first part being a contact surface of the powered device for contacting the power transmitter; a comparator for comparing the first temperature to a first reference temperature, the first reference temperature being indicative of a maximum allowable contact temperature for a surface of the power transmitter for receiving the power receiver; a controller for at least one of restricting the power of the power transfer signal and generating a user alert in response to the first temperature exceeding the first reference temperature; a first temperature sensor for determining a second temperature for a heating part of the powered device; a transmitter for transmitting power control loop feedback messages for requesting power level changes of the power transfer signal to the power transmitter during power transfer; and a power controller for generating power change requests for the power control loop feedback messages in response to the second temperature. - View Dependent Claims (13, 14, 15)
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17. A method of operation for a wireless power transfer system including a power transmitter and a power receiver, the power transmitter being arranged to generate a wireless inductive power transfer signal for powering the power receiver, the method comprising:
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receiving a first temperature for a first part of a powered device, the powered device comprising a heating part being heated by power from the power transfer signal; comparing the measured temperature to a first reference temperature, the first reference temperature being indicative of a maximum allowable contact temperature for a surface of the power transmitter for receiving the power receiver; and at least one of restricting the power of the power transfer signal and generating a user alert in response to the first temperature exceeding the first reference temperature; a temperature sensor of the power receiver determining a second temperature for a heating part of the powered device, the power receiver transmitting power control loop feedback messages for requesting power level changes of the power transfer signal to the power transmitter during power transfer, and the power receiver generating power change requests for the power control loop feedback messages in response to the second temperature.
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Specification