Systems and methods for inductively coupled power transfer and bidirectional communication
First Claim
1. A method of wireless power transfer, comprising:
- providing a primary rail voltage to a primary coil via a primary transistor network;
driving the primary transistor network with a primary pulse-width modulation (PWM) signal;
inducing a secondary current on a secondary coil;
providing a secondary rail voltage to a load via a secondary transistor network;
generating a voltage signal from the secondary current via a current sense amplifier;
phase-locking the voltage signal to the secondary current;
adjusting a phase shift and amplitude of the voltage signal based on the impedance of the load, thereby generating a driving voltage;
converting the driving voltage to a secondary PWM signal; and
driving the secondary transistor network with the PWM signal, wherein a barrier is disposed between the primary coil and the secondary coil, and wherein the primary coil generates a primary flux in the barrier and the secondary coil is driven by the secondary rail voltage to generate a secondary flux in the barrier that cancels out at least a portion of the primary flux.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of wireless power transfer includes providing a primary rail voltage to a primary coil via a primary transistor network, driving the primary transistor network with a primary PWM signal, inducing a secondary current on a secondary coil, providing a secondary rail voltage to a load via a secondary transistor network, generating a voltage signal from the secondary current via a current sense amplifier, phase-locking the voltage signal to the secondary current, adjusting a phase shift and amplitude of the voltage signal based on the impedance of the load, thereby generating a driving voltage, converting the driving voltage to a secondary PWM signal, and driving the secondary transistor network with the PWM signal.
27 Citations
20 Claims
-
1. A method of wireless power transfer, comprising:
-
providing a primary rail voltage to a primary coil via a primary transistor network; driving the primary transistor network with a primary pulse-width modulation (PWM) signal; inducing a secondary current on a secondary coil; providing a secondary rail voltage to a load via a secondary transistor network; generating a voltage signal from the secondary current via a current sense amplifier; phase-locking the voltage signal to the secondary current; adjusting a phase shift and amplitude of the voltage signal based on the impedance of the load, thereby generating a driving voltage; converting the driving voltage to a secondary PWM signal; and driving the secondary transistor network with the PWM signal, wherein a barrier is disposed between the primary coil and the secondary coil, and wherein the primary coil generates a primary flux in the barrier and the secondary coil is driven by the secondary rail voltage to generate a secondary flux in the barrier that cancels out at least a portion of the primary flux. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A wireless power transfer system, comprising:
-
a primary side, comprising; a primary coil configured to receive a primary rail voltage from a power supply via a primary transistor network and generate a magnetic field from a primary current; and a primary driver configured to drive the primary transistor network with a primary pulse-width modulation (PWM) signal; and a secondary side, comprising; a secondary coil configured to generate a secondary current from the magnetic field; a load configured to receive a secondary rail voltage from the secondary coil via a secondary transistor network; a current sense amplifier configured to generate a voltage signal from the secondary current; a phase locked loop circuit configured to phase-lock the voltage signal to the secondary current, generating a driving voltage; and a secondary driver configured to convert the driving voltage to a secondary PWM signal and drive the secondary transistor network with the secondary PWM signal, wherein the primary coil generates a primary flux in a barrier disposed between the primary coil and the secondary coil, and the secondary coil is driven to generate a secondary flux in the barrier, and wherein the secondary flux cancels out at least a portion of the primary flux. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. A wireless power transfer system with bidirectional communication, comprising:
-
a power supply; a primary side comprising; a primary driver; a primary transistor network drivable by the primary driver with a primary pulse-width modulation (PWM) signal; a primary coil electrically coupled to the power supply via the primary transistor network, the primary coil configured to generate a magnetic field when a primary current is induced therein; and a primary data encoder configured to encode a primary data onto the primary PWM signal; and a secondary side comprising; a secondary coil in which a secondary current is induced from the magnetic field; a secondary transistor network electrically coupled to the secondary coil; a load to which a secondary rail voltage from the secondary coil is delivered via the secondary transistor network; a current sense amplifier electrically coupled to the secondary coil so as to receive the secondary current and generate a voltage signal; a phase locked loop circuit electrically coupled to the current sense amplifier so as to be configured to phase-lock the voltage signal to the secondary current and generate a driving voltage; a secondary driver configured to convert the driving voltage to a secondary PWM signal and drive the secondary transistor network with the secondary PWM signal; and a secondary data decoder coupled to the current sense amplifier so as to be configured to extract the primary data from the primary PWM signal transmitted from the primary side, wherein the primary coil generates a primary flux in the barrier and the secondary coil is driven to generate a secondary flux in the barrier, and wherein the secondary flux cancels out at least a portion of the primary flux. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification