Mobile devices, mobile systems and operating methods thereof
A first mobile device including a connection terminal configured to electrically connect to a second mobile device, a variable impedance device connected to the connection terminal, the variable impedance device configured to vary an impedance, processing circuitry configured to determine a power line communication (PLC) mode between the first mobile device and the second mobile device to be one of a low-speed PLC mode or a high-speed PLC mode, and control the impedance of the variable impedance device according to the determined PLC mode, and a PLC modem configured to receive power from the second mobile device or communicate data with the second mobile device based on the determined PLC mode.
1. A first mobile device comprising:
a connection terminal configured to electrically connect to a second mobile device;
a variable impedance device connected to the connection terminal, the variable impedance device configured to vary an impedance;
processing circuitry configured to
change a power line communication (PLC) mode between the first mobile device and the second mobile device from a low-speed PLC mode to a high-speed PLC mode in response to receiving a message from the second mobile device, and
control the impedance of the variable impedance device according to the PLC mode; and
a PLC modem configured to receive power from the second mobile device or communicate data with the second mobile device based on the PLC mode,
wherein
the message is a host request, and
the processing circuitry is further configured to
send a client response to the second mobile device in response to receiving the host request from the second mobile device, and
change the PLC mode between the first mobile device and the second mobile device from the low-speed PLC mode to the high-speed PLC mode in response to sending the client response.
2. The first mobile device of claim 1 , wherein the PLC modem is configured to receive the power from the second mobile device in the low-speed PLC mode; and
the impedance of the variable impedance device corresponds to a first impedance in the low-speed PLC mode.
3. The first mobile device of claim 2 , wherein
the PLC modem is configured to communicate the data with the second mobile device in the high-speed PLC mode; and
the impedance of the variable impedance device corresponds to a second impedance in the high-speed PLC mode, the second impedance being higher than the first impedance.
4. The first mobile device of claim 1 , wherein
the processing circuitry is configured to change the PLC mode from the high-speed PLC mode to the low-speed PLC mode based on completion of a data reception from the second mobile device.
5. The first mobile device of claim 1 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to
generate a current modulation signal according to the control signal,
generate a current pulse according to the current modulation signal,
provide the current pulse to the connection terminal, and
generate a voltage demodulation signal according to a voltage of the connection terminal.
6. The first mobile device of claim 1 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to operate in the high-speed PLC mode including
generating a voltage modulation signal according to the control signal,
providing the voltage modulation signal to the connection terminal, and
generating a voltage demodulation signal according to a voltage of the connection terminal.
7. The first mobile device of claim 1 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to operate in the low-speed PLC mode including
generating a current modulation signal according to the control signal,
generating a current pulse according to the current modulation signal,
providing the current pulse to the connection terminal, and
generating a voltage demodulation signal according to a voltage of the connection terminal.
8. The first mobile device of claim 1 , wherein the processing circuitry is configured to receive the data from a main device through wireless communication, and
wherein the processing circuitry is configured to:
determine the PLC mode to be the high-speed PLC mode;
provide the data to the second mobile device in the high-speed PLC mode; and
change the PLC mode from the high-speed PLC mode to the low-speed PLC mode based on completion of transmission of the data to the second mobile device.
9. The first mobile device of claim 1 , further comprising:
a battery; and
a power management integrated circuit (PMIC) configured to manage power of the battery,
wherein the processing circuitry is configured to charge the battery with the power received from the second mobile device.
10. The first mobile device of claim 1 , wherein
the first mobile device includes a wireless earbud; and
the second mobile device includes a wireless charger.
11. A second mobile device comprising:
a connection terminal configured to electrically connect to a first mobile device;
a variable impedance device connected to the connection terminal, the variable impedance device configured to vary an impedance;
processing circuitry configured to
change a power line communication (PLC) mode from a low-speed PLC mode to a high-speed PLC mode in response to receiving a message from the first mobile device,
control the impedance of the variable impedance device according to the PLC mode,
receive an input voltage from an external source, and
generate a converted voltage from the input voltage; and
a PLC modem configured to transmit power to the first mobile device or communicate data with the first mobile device based on the PLC mode, the power being based on the converted voltage,
wherein
the message is a client response, and
the processing circuitry is further configured to
receive the message from the first mobile device in response to sending a host request to the first mobile device, and
change the PLC mode between the first mobile device and the second mobile device from the low-speed PLC mode to the high-speed PLC mode in response to receiving the message.
12. The second mobile device of claim 11 , wherein
the PLC modem is configured to transmit the power to the first mobile device in the low-speed PLC mode; and
the impedance of the variable impedance device corresponds to a first impedance in the low-speed PLC mode.
13. The second mobile device of claim 12 , wherein
the PLC modem is configured to communicate the data with the first mobile device in the high-speed PLC mode; and
the impedance of the variable impedance device corresponds to a second impedance in the high-speed PLC mode, the second impedance being higher than the first impedance.
14. The second mobile device of claim 11 , wherein
the processing circuitry is configured to change the PLC mode from the high-speed PLC mode to the low-speed PLC mode based on completion of a data reception from the first mobile device.
15. The second mobile device of claim 11 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to operate in the high-speed PLC mode including
generating a current modulation signal according to the control signal,
generating a current pulse according to the current modulation signal,
providing the current pulse to the connection terminal, and
generating a voltage demodulation signal according to a voltage of the connection terminal.
16. The second mobile device of claim 12 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to operate in the high-speed PLC mode including
generating a voltage modulation signal according to the control signal,
providing the voltage modulation signal to the connection terminal, and
generating a voltage demodulation signal according to a voltage of the connection terminal.
17. The second mobile device of claim 11 , wherein
the processing circuitry is configured to generate a control signal for controlling the PLC modem according to the PLC mode; and
the PLC modem is configured to operate in the low-speed PLC mode including
generating a voltage modulation signal according to the control signal,
providing the voltage modulation signal to the connection terminal, and
generating a current demodulation signal according to a current received from the connection terminal.
18. The second mobile device of claim 11 , further comprising:
a battery; and
a power management integrated circuit (PMIC) configured to manage power of the battery,
wherein the processing circuitry is configured to charge the battery based on the input voltage.
19. The second mobile device of claim 11 , wherein the processing circuitry is further configured to:
determine the PLC mode to be the high-speed PLC mode;
receive the data from the first mobile device in the high-speed PLC mode; and
change the PLC mode from the high-speed PLC mode to the low-speed PLC mode based on completion of reception of the data from the first mobile device.
20. The second mobile device of claim 11 , wherein the first mobile device includes a wireless earbud; and
the second mobile device includes a wireless charger.