Electronic device and method for measuring electric current of external electronic devices using the electronic device

1. A portable electronic device connected with an external electronic device, for measuring electric current of the external electronic device, the portable electronic device comprising:

an earphone jack;

a detecting circuit, connected to the earphone jack and configured to detect whether the earphone jack is connected to the external electronic device, and receive electric current signals from the external electronic device;

a control circuit, connected to the detecting circuit, for generating a first control signal when the detecting circuit detects that the earphone jack is connected to a headset, and generating a second control signal when the detecting circuit detects that the earphone jack is connected to the external electronic device;

an audio processing circuit comprising an audio processing channel and a signal passing channel, wherein the audio processing channel processes the sound signals from or to the headset via the earphone jack, and the signal passing channel directly passes the electric current signals from the external electronic device;

a switch circuit, with one end connected to the control circuit, another end switchably connected to one of the audio processing channel and the signal passing channel, for switching to the audio processing channel when the control circuit generates the first control signal, and switching to the signal passing channel a when the control circuit generates the second control signal; and

an application module, connected to the signal passing channel, for implementing a software to measure the electric current signals from the external electronic device.

2. The portable electronic device according to claim 1 , wherein the detecting circuit detects whether the earphone jack is connected to the external electronic device and receive electric current signals from the external electronic device based on an input voltage of the earphone jack.

3. The portable electronic device according to claim 1 , wherein the switch circuit is a single-pole double-throw (SPDT) switch which comprises a first contact and two second contacts, one end of the first contact is connected to the control circuit, another end of the first contact is selectively connected to either of the two second contacts, and the two second contacts are connected to the audio processing channel and the sound signal passing channel.

4. The portable electronic device according to claim 3 , further comprising a second switch connected to the earphone jack and the control circuit, and a power supply circuit connected to the second switch, wherein the second switch is controlled to connect the power supply circuit to the earphone jack when the control circuit generates the second control signal.

5. The portable electronic device 1 according to claim 1 , wherein the control circuit is a baseband chip.

6. The portable electronic device according to claim 1 , wherein the application module implements the software to measure the electric current signals from the external electronic device by displaying timing diagram and carrying out frequency and time analyzing according to the electric current signals.

7. A method for measuring electric current of an external electronic device by a portable electronic device, comprising:

detecting whether an earphone jack is connected to the external electronic device and receiving electric current signals from the external electronic device;

generating a first control signal when the detecting circuit detects that the earphone jack is connected to the earphone, and generating a second control signal when the detecting circuit detects that the earphone jack is connected to the external electronic device;

switching to the audio processing channel when the control circuit generates the first control signal, and switching to the signal passing channel when the control circuit generates the second control signal, wherein the audio processing channel processes the sound signals from or to the headset via the earphone jack, and the signal passing channel directly passes the electric current signals from the external electronic device; and

implementing a software to measure the electric current signals from the external electronic device.

8. The method for measuring electric current of an external electronic device according to claim 7 , wherein the method of detecting whether the earphone jack is connected to the external electronic device is based on an input voltage of the earphone jack.

9. The method for measuring electric current of an external electronic device according to claim 7 , wherein the switch circuit is a single-pole double-throw (SPDT) switch which comprises a first contact and two second contacts, one end of the first contact is connected to the control circuit, another end of the first contact is selectively connected to either of the two second contact, and the two second contacts are connected to the audio processing channel and the sound signal passing channel.

10. The method for measuring electric current of an external electronic device according to claim 9 , further comprising conducting a second switch to connect a power supply circuit to the earphone jack when the second control signal is generated to supply power to the external electronic device.

11. The method for measuring electric current of an external electronic device according to claim 7 , wherein the method of implementing the software to measure the electric current signals from the external electronic device is by displaying timing diagram and carrying out frequency and time analyzing according to the electric current signals.