METHOD FOR CONTROL IN WIRELESS POWER TRANSFER SYSTEMS
First Claim
1. A transmitting device of a wireless power transfer system for transmitting a power to a spatially separated receiving device, the transmitting device comprising:
- a transmitting inductor;
a inverter is configured to drive a current to the transmitting inductor, the current is an AC output inverted from an DC input by using a plurality of switches; and
a controller is configured to control the plurality of switches to be switched complementarily;
wherein the controller controls the plurality of switches to be switched in a constant frequency, and regulates an amplitude of the current by varying a difference of duty cycles between the switches being complementarily switched.
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Accused Products
Abstract
Claimed is a method for control in wireless power transfer systems and a wireless power transfer system implementing such method. The system comprises a transmitting inductor; a receiving inductor spaced apart from the transmitting inductor; a half bridge inverting circuit or a full bridge inverting circuit with constant switching frequency for driving the current in the transmitting inductor, wherein said half bridge inverting circuit comprises at least two switches, or said full bridge inverting circuit comprises at least two diagonal pairs of switches. The switches or diagonal pairs of switches are configured to be turned on complementarily, and the current amplitude in the transmitting inductor is controlled by varying the difference between the on-times of said switches. The claimed method and system provide efficient power transfer in conditions of variable load and/or variable input voltage and/or variable coupling between Tx and Rx parts.
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Citations
14 Claims
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1. A transmitting device of a wireless power transfer system for transmitting a power to a spatially separated receiving device, the transmitting device comprising:
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a transmitting inductor; a inverter is configured to drive a current to the transmitting inductor, the current is an AC output inverted from an DC input by using a plurality of switches; and a controller is configured to control the plurality of switches to be switched complementarily; wherein the controller controls the plurality of switches to be switched in a constant frequency, and regulates an amplitude of the current by varying a difference of duty cycles between the switches being complementarily switched. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a transmitting device of a wireless power transfer system for transmitting a power to a spatially separated receiving device, the method comprising:
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inputting a direct current (DC); inverting the inputted DC to an alternating current (AC) as an output by complementary switching a plurality of switches in a constant frequency; driving the AC output to a transmitting inductor of the transmitting device; and varying a difference of duty cycles between the switches being complementarily switched for regulating an amplitude of the current. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification