High efficiency wireless power system
First Claim
Patent Images
1. A transmitter for wireless transfer, comprising:
- a rectifier that receives an AC voltage and provides a DC voltage;
a first capacitor that receives and smooths the DC voltage;
a regulator that receives the DC voltage and outputs a regulated DC voltage; and
a wireless transmitter that receives the regulated DC voltage and transmits wireless power, the wireless transmitter comprising;
a transmitting coil with a center tap, a first side, and a second side;
an inductor coupling the input voltage to the center tap;
a second capacitor coupled between the first and second side;
a first switch, coupled between the first side and ground;
a second switch, coupled between the second side and ground; and
a controller that is configured to operate the first and second switches in an adaptive self-resonance mode when the wireless transmitter is coupled to and transmits power to a wireless receiver that operates in the adaptive self-resonance mode;
wherein in the adaptive self-resonance mode, in each period of time of a plurality of successive periods of time, one of the first and second switches is on and the other one of the first and second switches is off, and a voltage across the other one of the first and second switches becomes non-zero in the period of time but returns to zero by the end of the period of time;
wherein the voltages across both of the first and second switches are zero at the end of each said period of time; and
wherein the first and second switches are both switched by the controller at the end of each said period of time, when the voltages across both of the first and second switches are zero.
3 Assignments
0 Petitions
Accused Products
Abstract
In accordance with some embodiments, a transmitter for wireless transfer includes a rectifier that receives an AC voltage and provides a DC voltage; a capacitor that receives and smooths the DC voltage; a regulator that receives the DC voltage and outputs an input voltage; and a wireless transmitter that receives the input voltage and transmits wireless power.
19 Citations
20 Claims
-
1. A transmitter for wireless transfer, comprising:
-
a rectifier that receives an AC voltage and provides a DC voltage; a first capacitor that receives and smooths the DC voltage; a regulator that receives the DC voltage and outputs a regulated DC voltage; and a wireless transmitter that receives the regulated DC voltage and transmits wireless power, the wireless transmitter comprising; a transmitting coil with a center tap, a first side, and a second side; an inductor coupling the input voltage to the center tap; a second capacitor coupled between the first and second side; a first switch, coupled between the first side and ground; a second switch, coupled between the second side and ground; and a controller that is configured to operate the first and second switches in an adaptive self-resonance mode when the wireless transmitter is coupled to and transmits power to a wireless receiver that operates in the adaptive self-resonance mode; wherein in the adaptive self-resonance mode, in each period of time of a plurality of successive periods of time, one of the first and second switches is on and the other one of the first and second switches is off, and a voltage across the other one of the first and second switches becomes non-zero in the period of time but returns to zero by the end of the period of time; wherein the voltages across both of the first and second switches are zero at the end of each said period of time; and wherein the first and second switches are both switched by the controller at the end of each said period of time, when the voltages across both of the first and second switches are zero. - View Dependent Claims (2, 3, 4, 5, 6, 16, 17, 18)
-
-
7. A method of efficiently transmitting power wirelessly, comprising:
-
receiving AC power; rectifying and filtering the AC power to provide DC power; moderating the DC power to provide an input power; and wirelessly transmitting the input power using a wireless transmitter comprising; a transmitting coil with a center tap, a first side, and a second side; an inductor coupling the input power to the center tap; a capacitor coupled between the first and second side; a first switch, coupled between the first side and ground; a second switch, coupled between the second side and ground; and a controller that operates the first and second switches in an adaptive self-resonance mode when the wireless transmitter is coupled to and transmits power to a wireless receiver that operates in the adaptive self-resonance mode; wherein in the adaptive self-resonance mode, in each period of time of a plurality of successive periods of time, one of the first and second switches is on and the other one of the first and second switches is off, and a voltage across the other one of the first and second switches becomes non-zero in the period of time but returns to zero by the end of the period of time; wherein the voltages across both of the first and second switches are zero at the end of each said period of time; and wherein the first and second switches are both switched by the controller at the end of each said period of time, when the voltages across both of the first and second switches are zero. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 19, 20)
-
Specification