Control circuit for identifying power adaptor and method for use thereof

A method of identifying an adaptor used with an electronic device, comprising the following steps:

• converting an alternating current voltage inputted to the adaptor into a direct current voltage and outputting the direct current voltage, via one of a pair of positive and negative output terminals of the adaptor, to a switching circuit that is incorporated in the electronic device, the switching circuit comprising a metal-oxide-semiconductor field effect transistor (MOSFET) which has a source and a drain respectively connected to the one of the pair of positive and negative output terminals of the adaptor and the electronic device, wherein the other one of the positive and negative output terminals is connected to the electronic device;
• dividing the direct current voltage to form a controlling voltage having a value lower than the direct current voltage;
• and
• inputting the controlling voltage to the switching circuit via a control terminal to switch on the MOSFET of the switching circuit in order to electrically connect the adaptor with the electronic device and power the electronic device using the direct current voltage.

A control circuit being configured to identify an adaptor used with an electronic device, the control circuit comprising:

• a system-side circuit that is configured to be incorporated in the electronic device, wherein the system-side circuit includes a switching circuit;
• and
• an adaptor-side circuit that is configured to be incorporated in the adaptor, wherein the adaptor-side circuit is used to convert an alternating current voltage to a direct current voltage and output the direct current voltage by positive and negative output terminals thereof, one of the positive and negative output terminals is coupled to the switching circuit, the other one of the positive and negative output terminals is configured to be coupled to the electronic device, the adaptor-side circuit includes a dividing circuit connected to the one of the positive and negative output terminals that is coupled to the switching circuit, and the dividing circuit has a voltage output control terminal that is connected to the switching circuit and used to switch on the switching circuit so that the electronic device is powered;
• the switching circuit comprising two metal-oxide-semiconductor field effect transistors (MOSFETs) and two resistors, the two MOSFETs comprising a P-channel enhancement mode MOSFET whose source is connected to the positive output terminal and an N-channel enhancement mode MOSFET whose gate is connected to the control terminal, a source of the N-channel enhancement mode MOSFET being connected to ground (GND), a drain of the N-channel enhancement mode MOSFET being connected to a gate of the P-channel enhancement mode MOSFET via one of the two resistors, the other one of the two resistors being connected between the positive output terminal and the gate of the P-channel enhancement mode MOSFET, and a drain of the P-channel enhancement mode MOSFET being configured to be coupled to the electronic device.

A control circuit being configured to identify an adaptor used with an electronic device, the control circuit comprising:

• a system-side circuit that is configured to be incorporated in the electronic device, wherein the system-side circuit includes a switching circuit;
• and
• an adaptor-side circuit that is configured to be incorporated in the adaptor, wherein the adaptor-side circuit is used to convert an alternating current voltage to a direct current voltage and output the direct current voltage by positive and negative output terminals thereof, one of the positive and negative output terminals is coupled to the switching circuit, the other one of the positive and negative output terminals is configured to be coupled to the electronic device, the adaptor-side circuit includes a dividing circuit connected to the one of the positive and negative output terminals that is coupled to the switching circuit, and the dividing circuit has a voltage output control terminal that is connected to the switching circuit and used to switch on the switching circuit so that the electronic device is powered;
• the switching circuit comprising a P-channel enhancement mode metal-oxide-semiconductor field effect transistor (MOSFET), a source of the P-channel enhancement mode MOSFET being connected to the positive output terminal, a gate of the P-channel enhancement mode MOSFET being connected to the control terminal, and a drain of the P-channel enhancement mode MOSFET being configured to be coupled to the electronic device.