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US 11,056,931 B2Granted
Wireless power transfer method and device therefor
AssigneeLG Innotek Co., Ltd.
InventorsJay Park, Jong Heon Lee
Life of this patent
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Abstract
The present invention relates to wireless power transmission technology, and more particularly, to a wireless power transfer method and a device therefor. The wireless power transfer method may include operating with a first driving voltage, determining whether a ping phase is entered, determining whether the wireless power transmitter is in a first state when the ping phase is entered; and operating with a second driving voltage when the first state is determined.
Claims19
A wireless power transfer method for a wireless power transmitter which wirelessly transmits power to a wireless power receiver, the method comprising:
- operating with a first driving voltage;
- determining whether the wireless power transmitter has entered a ping phase;
- when the ping phase is determined to be entered, determining whether the wireless power transmitter is in a first state;
- and
- when the wireless power transmitter is determined to be in the first state, operating with a second driving voltage,
- wherein the determining of whether the wireless power transmitter is in the first state includes:
- transmitting a first detection signal to the wireless power receiver;
- measuring an internal current of the wireless power transmitter;
- determining whether the measured internal current is greater than or equal to a first reference current;
- and
- determining that the wireless power transmitter is in the first state when the measured internal current is determined to be greater than or equal to the first reference current, wherein the determining of whether the wireless power transmitter is in the first state includes determining whether the first state is maintained at the wireless power transmitter for a first reference time,
- further comprising:
- when operating with the second driving voltage, transmitting a second detection signal to the wireless power receiver;
- after transmitting the second detection signal, measuring an internal current of the wireless power transmitter;
- determining whether the measured internal current is less than a second reference current after the second detection signal is transmitted;
- determining that the wireless power transmitter is in a second state when the measured internal current is determined to be less than a second reference current after the second detection signal is transmitted;
- determining whether the second state is maintained at the wireless power transmitter for a second reference time;
- and
- operating with the first driving voltage when the second state is determined to be maintained at the wireless power transmitter for the second reference time.
16 more elements
A wireless power transfer method for a wireless power transmitter which wirelessly transmits power to a wireless power receiver, the method comprising:
- operating with a first driving voltage;
- determining whether the wireless power transmitter has entered a ping phase;
- when the ping phase is determined to be entered, determining whether the wireless power transmitter is in a first state;
- and
- when the wireless power transmitter is determined to be in the first state, operating with a second driving voltage,
- wherein the determining of whether the wireless power transmitter is in the first state includes:
- initializing a first detection signal counter to have a total count at zero;
- transmitting a first detection signal to the wireless power receiver;
- determining whether the wireless power transmitter receives, from the wireless power receiver, a response signal to the first detection signal;
- when the response signal is determined to not be received at the wireless power transmitter, increasing the total count of the first detection signal counter by one and determining whether the total count of the first detection signal counter exceeds a predetermined threshold;
- determining that the wireless power transmitter is in the first state when the total count of the first detection signal counter is determined to exceed the predetermined threshold;
- and
- operating with the second driving voltage when the wireless power transmitter is determined to be in the first state.
10 more elements
A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:
- a power converter configured to provide a first driving voltage and to provide a second driving voltage;
- a power transmitter configured to transmit a first detection signal based on the first driving voltage and to transmit a second detection signal based on the second driving voltage;
- and
- a controller configured to control the power converter to provide the second driving voltage when the wireless power transmitter is in a first state,
- wherein the controller is configured to:
- initialize a first detection signal counter to have a total count of zero when the wireless power transmitter has entered a ping phase,
- increase the total count of the first detection signal counter by one when the wireless power transmitter has not received a response signal to the first detection signal, and
- determine that the wireless power transmitter is in the first state when the total value of the first detection signal counter exceeds a predetermined threshold.
5 more elements
A method to control wireless power at a wireless power transmitter, comprising:
- generating, at the wireless power transmitter, a plurality of ping signals;
- separately sensing a current corresponding to each of the ping signals;
- and
- adjusting a driving voltage of at least one of the ping signals based on the sensed current,
- wherein a first one of the plurality of ping signals is provided based on a first driving voltage,
- wherein adjusting the voltage of at least one of the ping signals includes determining a number of times that the sensed current is greater than a first reference current, and adjusting the voltage of the ping signals based on the first driving voltage to a second driving voltage when the determined number of times the sensed current is greater than the reference current exceeds a predetermined first value without response from a wireless power receiver.
3 more elements
Dependencies are inferred from the claim text.