Wireless power transmitting device, wireless power receiving device, and method of operating the same
An example wireless power transmitter may include a transmission coil, a converter configured to output a driving voltage, an inverter configured to output AC power to the transmission coil using the driving voltage, and a controller. The controller may be configured to identify a first voltage at one point within the wireless power transmitter while power is wirelessly transmitted through the transmission coil. The controller may be configured to perform at least one operation for providing a first packet for reduction in modulation depth of a wireless power receiver to the wireless power receiver based on a peak-to-peak value identified to be larger than a first reference value according to the first voltage.
1. A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:
a transmission coil;
a converter configured to output a driving voltage;
an inverter configured to output AC power to the transmission coil using the driving voltage; and
a controller,
wherein the controller is configured to:
measure a first voltage at one point within the wireless power transmitter while the power is wirelessly transmitted through the transmission coil,
identify a peak-to-peak value based on a difference between a maximum value and a minimum value of the first voltage, and
in accordance with the peak-to-peak value being greater than a first reference value, perform at least one operation for providing a first packet for reduction in modulation depth of the wireless power receiver to the wireless power receiver.
2. The wireless power transmitter of claim 1 , wherein the first voltage is the driving voltage, and
the controller is configured to perform at least one operation for providing the first packet, based on the peak-to-peak value identified based on the difference between the maximum value and the minimum value of the driving voltage being greater than the first reference value.
3. The wireless power transmitter of claim 1 , further comprising a capacitor having one end connected to an input terminal of the inverter and an output terminal of the converter,
wherein the first voltage is a voltage at another end of the capacitor, and
the controller is configured to perform at least one operation for providing the first packet, based on the peak-to-peak value identified based on the difference between the maximum value and the minimum value of the voltage at the other end of the capacitor being greater than the first reference value.
4. The wireless power transmitter of claim 3 , wherein the controller further comprises an analog-to-digital converter (ADC) electrically connected to the other end of the capacitor, and
the controller is configured to:
identify the peak-to-peak value, based on the difference between the maximum value and the minimum value of the first voltage converted using the ADC, and
perform at least one operation for providing the first packet, based on the identified peak-to-peak value being greater than the first reference value.
5. The wireless power transmitter of claim 1 , wherein the controller is configured to perform at least one operation for providing a second packet for an increase in modulation depth to the wireless power receiver, based on the peak-to-peak value being smaller than a second reference value, which is smaller than the first reference value.
6. The wireless power transmitter of claim 5 , wherein the controller is configured to refrain from performing an operation for providing a packet related to control of the modulation depth, based on the peak-to-peak value being equal to or smaller than the first reference value and greater than or equal to the second reference value.
7. The wireless power transmitter of claim 1 , wherein the controller is configured to modulate a frequency of the AC power applied to the transmission coil as the at least one operation for providing the first packet.
8. The wireless power transmitter of claim 1 , wherein the first packet is configured to cause reduction in a number of switches used for amplitude modulation of the wireless power receiver.
9. A method of operating a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the method comprising:
providing a driving voltage to an inverter of the wireless power transmitter by a converter of the wireless power transmitter;
applying AC power to a transmission coil of the wireless power transmitter by the inverter using the driving voltage;
measuring a first voltage at one point within the wireless power transmitter while the power is wirelessly transmitted through the transmission coil;
identifying a peak-to-peak value based on a difference between a maximum value and a minimum value of the first voltage; and
in accordance with the peak-to-peak value being greater than a first reference value, performing at least one operation for providing a first packet for reduction in modulation depth of the wireless power receiver to the wireless power receiver.
10. The method of claim 9 , wherein the first voltage is the driving voltage, and
the performing of the at least one operation for providing the first packet comprises performing at least one operation for providing the first packet, based on the peak-to-peak value identified based on the difference between the maximum value and the minimum value of the driving voltage being greater than the first reference value.
11. The method of claim 9 , wherein the wireless power transmitter further comprises a capacitor having one end connected to an input terminal of the inverter and an output terminal of the converter,
the first voltage is a voltage at another end of the capacitor, and
the performing of the at least one operation for providing the first packet comprises performing at least one operation for providing the first packet, based on the peak-to-peak value identified based on the difference between the maximum value and the minimum value of the voltage at the other end of the capacitor being greater than the first reference value.
12. The method of claim 11 , wherein the wireless power transmitter further comprises an analog-to-digital converter (ADC) electrically connected to the other end of the capacitor,
the identifying of the peak-to-peak value comprises identifying the peak-to-peak value, based on the difference between the maximum value and the minimum value of the first voltage converted using the ADC, and
the performing of the at least one operation for providing the first packet comprises performing the at least one operation for providing the first packet, based on the identified peak-to-peak value being greater than the first reference value.
13. The method of claim 9 , further comprising performing at least one operation for providing a second packet for an increase in modulation depth to the wireless power receiver, based on the peak-to-peak value being smaller than a second reference value, which is smaller than the first reference value.
14. The method of claim 13 , further comprising refraining from performing an operation for providing a packet related to control of the modulation depth, based on the peak-to-peak value being equal to or smaller than the first reference value and greater than or equal to the second reference value.
15. The method of claim 9 , wherein the at least one operation for providing the first packet comprises modulating a frequency of the AC power applied to the transmission coil.
16. The method of claim 9 , wherein the first packet is configured to cause reduction in a number of switches used for amplitude modulation of the wireless power receiver.