WIRELESS INDUCTIVE POWER TRANSFER
First Claim
1. A power transmitter for transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising:
- an inductor for providing the wireless inductive power signal in response to a drive signal fed to the inductor;
a power source for providing a power source signal;
a power signal generator for generating the drive signal from the power source signal, the power signal generator comprising;
a frequency converter arranged to generate a frequency of the drive signal to be higher than a frequency of the power source signal,a limiter for restricting a power of the drive signal fed to the inductor to be below a threshold in repeating time intervals;
a synchronizer for synchronizing the repeating time intervals to the power source signal; and
a communication unit for exchanging data with the power receiver during the repeating time intervals.
1 Assignment
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Accused Products
Abstract
A power transmitter (501) transfers power to a power receiver (505) using a wireless inductive power signal between inductors of the devices. In the power transmitter (501) a power source (601) provides a power source signal which may have level variations. A power signal generator (603) generates a drive signal from the power source signal by means of a frequency converter (605) which increases the frequency of the drive signal relative to the power source signal. A limiter (607) for restricts the power of the drive signal fed to the inductor (503) to be below a threshold in repeating time intervals. A synchronizer (611) synchronizes the repeating time intervals to the power source signal. In the power receiver(505) a load coupler (1001) decouples the power load (1003) from the inductor (507) during the repeating time intervals and a synchronizer (1005) synchronizes the repeating time intervals of the receiver to the power signal. Communication units (609, 1007) exchange data during the repeating time intervals.
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Citations
30 Claims
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1. A power transmitter for transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising:
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an inductor for providing the wireless inductive power signal in response to a drive signal fed to the inductor; a power source for providing a power source signal; a power signal generator for generating the drive signal from the power source signal, the power signal generator comprising; a frequency converter arranged to generate a frequency of the drive signal to be higher than a frequency of the power source signal, a limiter for restricting a power of the drive signal fed to the inductor to be below a threshold in repeating time intervals; a synchronizer for synchronizing the repeating time intervals to the power source signal; and a communication unit for exchanging data with the power receiver during the repeating time intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A power receiver for receiving power from a power transmitter using a wireless inductive power signal, the power receiver comprising:
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an inductor for receiving the power signal; a load coupler for coupling the power signal to a load, the load coupler being arranged to decouple the load from the inductor during repeating time intervals; a synchronizer for synchronizing the repeating time intervals to amplitude variations of the power signal; and a communication unit for exchanging data with the power transmitter during the repeating time intervals. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of operation for a power transmitter transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising an inductor for providing the wireless inductive power signal in response to a drive signal fed to the inductor;
- and the method comprising;
providing a power source signal; generating the drive signal from the power source signal, the generating comprising; generating a frequency of the drive signal to be higher than a frequency of the power source signal, and restricting a power of the drive signal fed to the inductor to be below a threshold in repeating time intervals; synchronizing the repeating time intervals to the power source signal; and exchanging data with the power receiver during the repeating time intervals.
- and the method comprising;
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30. A method of operation for a power receiver receiving power from a power transmitter using a wireless inductive power signal, the power receiver comprising an inductor for receiving the power signal and a load coupler for coupling the power signal to a load;
- and the method comprising;
the load coupler decoupling the load from the inductor during repeating time intervals; synchronizing the repeating time intervals to amplitude variations of the power signal; and exchanging data with the power transmitter during the repeating time intervals.
- and the method comprising;
Specification