Mobile device, electronic device and electronic system for power line communication
An electronic device that includes a first mobile device, and a second mobile device directly connected with the first mobile device through a power line, the second mobile device being configured to perform power line communication with the first mobile device through the power line for a first time period, and perform wireless communication with an external device for a second time period, the second time period not overlapping the first time period.
1. An electronic system comprising:
an ear bud including a first battery;
a cradle directly connected with the ear bud through a power line, the cradle including a second battery; and
a charging pad adjacent to the cradle,
wherein the cradle is configured to,
provide an amplitude shift keying (ASK) signal to the charging pad for a first time period, the ASK signal being generated using a voltage of the second battery, and
provide a pogo voltage to the ear bud through the power line for a second time period, the pogo voltage including a data signal generated using the voltage of the second battery, and the first time period not overlapping the second time period.
2. The electronic system of claim 1 , wherein the charging pad is in contact with the cradle.
3. The electronic system of claim 1 , wherein the first battery and the second battery are charged at the same time.
4. The electronic system of claim 1 , wherein the ear bud is configured to:
generate a pogo current including a signal responding to the data signal; and
provide the pogo current to the power line.
5. The electronic system of claim 1 , wherein the cradle is configured to charge the second battery based on a wireless signal received from the charging pad.
6. The electronic system of claim 5 , wherein the cradle is further configured to perform charge the second battery based on a wired signal received from the charging pad.
7. The electronic system of claim 1 , wherein the cradle is configured to receive a frequency shift keying (FSK) signal from the charging pad for a third time period that is not overlapped with the first time period or the second time period.
8. The electronic system of claim 1 , wherein the cradle is configured to simultaneously perform power line communication with the ear bud and wire communication with the charging pad.
9. The electronic system of claim 1 , wherein the ear bud further includes a first power management integrated circuit configured to manage the first battery, and the cradle further includes a second power management integrated circuit configured to manage the second battery.
10. The electronic system of claim 1 , further comprising:
a main device configured to perform a wireless communication with the ear bud.
11. An operating method of an electronic system including a first mobile device and a second mobile device, the method comprising:
charging, by the second mobile device, a first battery of the first mobile device by transmitting a first signal to the first mobile device through a wired line for a first time period; and
charging, by an external device, a second battery of the second mobile device by transmitting a second signal to the second mobile device using a wireless communication,
wherein the second mobile device is configured to transmit a response signal for the second signal to the external device for a second time period, and
the first time period is not overlapping the second time period.
12. The method of claim 11 , further comprising:
contacting, by the second mobile device, the external device.
13. The method of claim 11 , wherein the second signal includes a frequency shift keying (FSK) signal, and the response signal includes an amplitude shift keying (ASK) signal.
14. The method of claim 13 , wherein the FSK signal is transmitted from the external device to the second mobile device for a third time period that is not overlapped with the first time period or the second time period.
15. The method of claim 11 , wherein the first signal includes a pogo voltage.
16. The method of claim 15 , further comprising:
generating, by the first mobile device, a pogo current in response to the pogo voltage.
17. The method of claim 11 , wherein charging the first battery and charging the second battery are simultaneously performed.
18. The method of claim 11 , wherein
the first mobile device is an ear bud; and
the second mobile device is a cradle that accommodates the ear bud.
19. The method of claim 11 , wherein the first time period is shorter than the second time period.
20. The method of claim 11 , further comprising:
charging, by the external device, the second battery of the second mobile device by transmitting a third signal to the second mobile device through a wired power line.