WIRELESS CHARGER SYSTEM THAT HAS VARIABLE POWER / ADAPTIVE LOAD MODULATION
First Claim
1. A wireless charging system that includes in-band communication, comprising:
- a source device, comprising;
at least one transmitter coil for providing a wireless charging power; and
at least the target device, oriented on and magnetically coupled to the source device, for receiving the charging power, the target device comprising;
a receiver coil, loosely coupled to the transmitter coil, for receiving the charging power; and
a variable resistor loading the receiver coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless charging system that includes in-band communication includes: a source device, including: at least a transmitter coil for providing a wireless charging power which is modulated according to a reflected impedance of at least a target device; and at least the target device, oriented on and magnetically coupled to the source device, for receiving the charging power. The target device includes: a receiver coil, loosely coupled to the transmitter coil, for receiving the charging power; a variable resistor loading the receiver coil; and a power detection and modulation circuit, for determining a size of the charging power, and providing a modulation control signal to the variable resistor according to the size of the charging power, for varying the resistance of the variable resistor in order to control an impedance of the target device which will be reflected at the source device.
-
Citations
26 Claims
-
1. A wireless charging system that includes in-band communication, comprising:
-
a source device, comprising; at least one transmitter coil for providing a wireless charging power; and at least the target device, oriented on and magnetically coupled to the source device, for receiving the charging power, the target device comprising; a receiver coil, loosely coupled to the transmitter coil, for receiving the charging power; and a variable resistor loading the receiver coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method that includes in-band communication in a wireless charging system, the method comprising:
-
orienting at least a target device to be in proximity to a source device; driving at least one transmitter coil in the source device to provide a wireless charging power which is modulated according to a reflected impedance of at least the target device; providing a receiver coil in the target device to receive the charging power; determining a size of the charging power; and generating a modulation control signal according to the size of the charging power. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
Specification