Method and apparatus for controlling wireless induction power supply
First Claim
1. An circuit for a wireless induction power supply, comprising:
- a transmitter circuit for generating a plurality of switching signals for switching a transmitter winding of the wireless power supply for generating a power for delivery to a load of a receiver side of the wireless power supply;
a first input of the transmitter circuit for receiving a signal that is representative of an input voltage to the wireless power supply;
a second input of the transmitter circuit for receiving a signal that is representative of a level of a transmitter signal from the transmitter winding wherein the transmitter signal is representative of an impedance of the transmitter winding;
the transmitter circuit configured to detect a foreign object wherein the foreign object is detected and the switching signals are disabled in response to detecting the level being less than a threshold while the load is decoupled from receiving the power and while the switching signals are enabled, and the transmitter circuit configured to detect a no-load condition and disable the switching signals in response to detecting the level being higher than the threshold over a first period while the power is coupled to the load and the switching signals are enabled.
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Accused Products
Abstract
The present invention provides a method and an apparatus for controlling the wireless induction power supply. The apparatus comprises a transmitter control circuit and a receiver control circuit. The method comprises generating a plurality of switching signals for switching a transmitter winding and generating a power; detecting a level of a transmitter signal from the transmitter winding; and controlling a switch to deliver the power from a receiver winding to a load. The receiver winding is coupled to receive the power from the transmitter winding. The switching signals will be disabled if the level of the transmitter signal is not higher than a threshold over a first period or the level of the transmitter signal is higher than a high-threshold over a second period. Accordingly, the method and the apparatus according to the present invention have the foreign object detection (FOD) function for the safety.
5 Citations
20 Claims
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1. An circuit for a wireless induction power supply, comprising:
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a transmitter circuit for generating a plurality of switching signals for switching a transmitter winding of the wireless power supply for generating a power for delivery to a load of a receiver side of the wireless power supply; a first input of the transmitter circuit for receiving a signal that is representative of an input voltage to the wireless power supply; a second input of the transmitter circuit for receiving a signal that is representative of a level of a transmitter signal from the transmitter winding wherein the transmitter signal is representative of an impedance of the transmitter winding; the transmitter circuit configured to detect a foreign object wherein the foreign object is detected and the switching signals are disabled in response to detecting the level being less than a threshold while the load is decoupled from receiving the power and while the switching signals are enabled, and the transmitter circuit configured to detect a no-load condition and disable the switching signals in response to detecting the level being higher than the threshold over a first period while the power is coupled to the load and the switching signals are enabled. - View Dependent Claims (2, 3, 4)
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5. A method for a transmitter circuit of a wireless induction power supply, comprising:
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configuring a transmitter control circuit to form one or more switching signals for switching a transmitter winding of the wireless induction power supply for generating a power for delivery to a load by a receiver circuit of the wireless induction power supply; configuring an input of the transmitter control circuit to receive a transmitter signal formed by the transmitter winding in response to switching of the one or more switching signals wherein the transmitter signal is representative of an impedance of the transmitter winding; and configuring the transmitter control circuit to detect a foreign object and disable the one or more switching signals in response to detecting the transmitter signal having a first level that is representative of the impedance being less than a threshold value while the one or more switching signals are enabled and the load is decoupled from receiving the power, configuring the transmitter control circuit to continue enabling the one or more switching signals in response to detecting the transmitter signal having a second level that is representative of the impedance being greater than the threshold while the load is decoupled from receiving the power and the one or more switching signals are enabled, and configuring the transmitter control circuit to detect a no-load condition and disable the one or more switching signals in response to detecting the transmitter signal having a third level representative of the impedance being greater than the threshold over a first period of time while the load is coupled for receiving the power and the one or more switching signals are enabled. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for a wireless induction power supply, comprising:
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configuring a transmitter circuit to generate a plurality of switching signals for switching a transmitter winding for generating a power for delivery to a load; and configuring the transmitter circuit to detect a foreign object and disable the plurality of switching signals in response to detecting an impedance of the transmitter winding being less than a threshold while power is not delivered to a load and while the plurality of switching signal are enabled; and configuring the transmitter circuit to detect a no-load condition and disable the plurality of switching signals in response to the detecting the impedance greater than the threshold over a period of time while the plurality of switching signal are enabled and while power is coupled to deliver to the load. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification