Device and method for supporting improved communication speed in wireless power transmission system
The present invention relates to a device and method for supporting improved communication speed in a wireless power transmission system. The present specification provides a method comprising the steps of: generating wireless power at an operating frequency; configuring n, as the number of cycles per bit, which is used for transmitting one bit at the operating frequency; aligning each bit of the data with the n cycles; causing the operating frequency to transition between differential biphases according to the value of said each bit during the n cycles; and transmitting the wireless power to a wireless power receiving device on the basis of magnetic coupling at the transitioning operating frequency.
1. A method for transmitting data and wireless power by a wireless power transmitter, comprising:
generating the wireless power at an operating frequency;
setting the number n of cycles per bit used to transmit one bit at the operating frequency;
aligning each bit of the data to the n cycles;
transitioning the operating frequency between differential bi-phases depending on values of each bit for the n cycles; and
transmitting the wireless power to a wireless power receiver based on magnetic coupling at the transitioned operating frequency.
2. The method of claim 1 , wherein the number of cycles per unit bit is variably set based on a modulation level.
3. The method of claim 2 , wherein the number of cycles per unit bit decreases based on the increase in the modulation level.
4. The method of claim 1 , wherein the number of cycles per unit bit or the modulation level is set in a negotiation phase related to the transmission of the wireless power.
5. The method of claim 2 , wherein the information on the modulation level is included in a capability packet of the wireless power transmitter and transmitted to the wireless power receiver.
6. The method of claim 5 , wherein the capability packet of the wireless power transmitter is transmitted as a response to a request packet of the wireless power receiver.
7. The method of claim 6 , wherein the request packet of the wireless power receiver includes information on a modulation level selected by the wireless power receiver.
8. The method of claim 1 , wherein the modulation level or the number of cycles per unit bit is defined as a default.
9. A wireless power transmitter transmitting data and wireless power, comprising:
a power conversion unit that generates the wireless power at an operating frequency and transmits the generated wireless power to a wireless power receiver based on magnetic coupling; and
a communication/control unit that sets the number n of cycles per bit used to transmit one bit at the operating frequency, aligns each bit of the data to n cycles, and transitions the operating frequency between differential bi-phases depending on values of each bit for the n cycles.
10. The wireless power transmitter of claim 9 , wherein the number of cycles per unit bit is variably set based on a modulation level.
11. The wireless power transmitter of claim 10 , wherein the number of cycles per unit bit decreases based on the increase in the modulation level.
12. The wireless power transmitter of claim 10 , wherein the number of cycles per unit bit or the modulation level is set in a negotiation phase related to the transmission of the wireless power.
13. The wireless power transmitter of claim 10 , wherein the communication/control unit transmits information on the modulation level to the wireless power receiver by including the information on the modulation level in a capability packet of the wireless power transmitter.
14. The wireless power transmitter of claim 13 , wherein the communication/control unit transmits the capability packet of the wireless power transmitter as a response to a request packet of the wireless power receiver.
15. A wireless power receiver receiving data and wireless power, comprising:
a power pick-up unit that receives the wireless power from a wireless power transmitter at an operating frequency; and
a communication/control unit that detects n cycles aligning each bit at the operating frequency based on the number n of cycles per bit negotiated with the wireless power transmitter in advance, detects a transition phase of the operating frequency for the n cycles, and decodes data received from the wireless power transmitter based on the transition phase of the operating frequency.