Method for detecting change in load during wireless charging and wireless power transmitter thereof
First Claim
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1. A wireless power transmitter comprising:
- a power transmission unit configured to transmit power to a wireless power receiver;
a current detection unit configured to measure a voltage value corresponding to a current that is output to the power transmission unit while the power is transmitted from the power transmission unit by using a plurality of current detection resistors disposed in series in a differential current path; and
a controller configured to adjust the power transmitted by the power transmission unit based on the measured voltage value,wherein the current detection unit comprises at least one amplifier of which two outputs are connected to each of the plurality of current detection resistors.
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Abstract
A wireless power transmitter and a method for detecting a change in load during wireless charging in the wireless power transmitter is provided. The wireless power transmitter includes a power transmission unit configured to transmit power to a wireless power receiver, a current detection unit configured to measure a voltage value corresponding to a current that is output to the power transmission unit while the power is transmitted from the power transmission unit, and a controller configured to adjust the power transmitted by the power transmission unit based on the measured voltage value.
7 Citations
15 Claims
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1. A wireless power transmitter comprising:
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a power transmission unit configured to transmit power to a wireless power receiver; a current detection unit configured to measure a voltage value corresponding to a current that is output to the power transmission unit while the power is transmitted from the power transmission unit by using a plurality of current detection resistors disposed in series in a differential current path; and a controller configured to adjust the power transmitted by the power transmission unit based on the measured voltage value, wherein the current detection unit comprises at least one amplifier of which two outputs are connected to each of the plurality of current detection resistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting a change in load during wireless charging in a wireless power transmitter, the method comprising:
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transmitting power to a wireless power receiver through a power transmission unit; measuring, by a current detection unit, a voltage value corresponding to a current that is output to the power transmission unit while the power is transmitted from the power transmission unit by using a plurality of current detection resistors disposed in series in a differential current path; and adjusting the power that is transmitted from the power transmission unit, based on the measured voltage value, wherein the current detection unit comprises at least one amplifier of which two outputs are connected to each of the plurality of current detection resistors. - View Dependent Claims (13, 14, 15)
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Specification