Method and apparatus of load detection for a planar wireless power system
First Claim
1. A method of determining information regarding a load for a planar wireless power transfer system, comprising:
- driving a transmitter coil of a planar wireless power transfer system with a drive amplifier;
measuring a transmitter coil voltage provided by the drive amplifier to the transmitter coil, wherein the transmitter coil voltage is measured from a circuit physically and directly connected in parallel with the transmitter coil, the circuit comprising a diode and a capacitor; and
determining information regarding a load positioned proximate to the transmitter coil based at least in part upon the measured transmitter coil.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments of the subject invention relate to a method and apparatus for determining information regarding a load in a planar wireless power transfer system by extracting system operating parameters from one or more test points in the transmitter circuit. As shown in FIG. 1, a specific embodiment showing three test points in the transmitter circuit from which operating parameters can be extracted. The transmitter circuit is designed to produce a magnetic field, by driving the transmitter coil, which inductively couples to a receiver coil such that power is provided to a receiver. By extracting operating parameters from the transmitter circuit, the receiver does not need to incorporate sophisticated signal processing and can be manufactured with low cost.
6 Citations
44 Claims
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1. A method of determining information regarding a load for a planar wireless power transfer system, comprising:
- driving a transmitter coil of a planar wireless power transfer system with a drive amplifier;
measuring a transmitter coil voltage provided by the drive amplifier to the transmitter coil, wherein the transmitter coil voltage is measured from a circuit physically and directly connected in parallel with the transmitter coil, the circuit comprising a diode and a capacitor; and
determining information regarding a load positioned proximate to the transmitter coil based at least in part upon the measured transmitter coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- driving a transmitter coil of a planar wireless power transfer system with a drive amplifier;
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24. A method of determining information regarding a load for planar wireless power transfer system, comprising:
- driving a transmitter coil of a planar wireless power transfer system with a drive amplifier;
measuring a transmitter coil current passing through the transmitter coil, wherein the transmitter coil current is measured from a circuit connected across a resistor that is physically and directly connected in series with the transmitter coil, the circuit comprising a differential amplifier, a diode, and a capacitor; and
determining information regarding a load positioned proximate to the transmitter coil based at least in part upon the measured transmitter coil current. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
- driving a transmitter coil of a planar wireless power transfer system with a drive amplifier;
Specification