Wireless power transmitter
First Claim
1. A wireless power transmitter that supplies power to a load, comprising:
- an inverter that converts a direct current (DC) signal at an input port of the inverter to an alternating current (AC) signal at an output port of the inverter;
a first phase detector that detects a first phase of an output voltage at the output port of the inverter;
a second phase detector that detects a second phase of an output current at the output port of the inverter;
a phase difference counter that counts a phase difference between the first phase of the output voltage and the second phase of the output current;
a controller that receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter; and
an impedance tuning circuit that receives the control signal from the controller and tunes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless power transmitter that supplies power to a load. The wireless power transmitter includes an inverter, a voltage phase detector, a current phase detector, a phase difference counter, a controller and an impedance tuning circuit. The phase difference counter counts a phase difference between the voltage phase and the current phase at the output port of the inverter. The controller receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter wirelessly. The impedance tuning circuit receives the control signal from the controller and tunes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load.
-
Citations
20 Claims
-
1. A wireless power transmitter that supplies power to a load, comprising:
-
an inverter that converts a direct current (DC) signal at an input port of the inverter to an alternating current (AC) signal at an output port of the inverter; a first phase detector that detects a first phase of an output voltage at the output port of the inverter; a second phase detector that detects a second phase of an output current at the output port of the inverter; a phase difference counter that counts a phase difference between the first phase of the output voltage and the second phase of the output current; a controller that receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter; and an impedance tuning circuit that receives the control signal from the controller and tunes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method executed by a wireless power transmitter that supplies power to a load, the method comprising:
-
converting, by an inverter of the wireless power transmitter, a direct current (DC) signal at an input port of the inverter to an alternating current (AC) signal at an output port of the inverter; detecting, by a first phase detector of the wireless power transmitter, a first phase of an output voltage at the output port of the inverter; detecting, by a second phase detector of the wireless power transmitter, a second phase of an output current at the output port of the inverter; counting, by a phase difference counter of the wireless power transmitter, a phase difference between the first phase of the output voltage and the second phase of the output current; receiving, by a controller of the wireless power transmitter, the phase difference from the phase difference counter; generating, by the controller of the wireless power transmitter, a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter; receiving, by an impedance tuning circuit of the wireless power transmitter, the control signal from the controller; and adjusting, by the impedance tuning circuit of the wireless power transmitter, an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. An impedance matching system that connects to an amplifier of an inverter and a load, comprising:
-
a first phase detector that detects a first phase of an output voltage at the output port of the inverter; a second phase detector that detects a second phase of an output current at the output port of the inverter; a phase difference detector that detects a phase difference between the first phase of the output voltage and the second phase of the output current; a controller that receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to detecting that changes occur to the load that is coupled with the impedance matching system; and an impedance tuning circuit that receives the control signal from the controller and changes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the inverter to the load. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification