Patent ID: 7804257
Filing Date: 2010-09-28
Classification: H02J

Abstract:
1. 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 said 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 said switching circuit, and the dividing circuit has a voltage output control terminal that is connected to said switching circuit and used to switch on said switching circuit so that the electronic device is powered; said switching circuit comprising two metal-oxide-semiconductor field effect transistors (MOSFETs) and a resistor, 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), and a drain of the N-channel enhancement mode MOSFET being connected to a gate of the P-channel enhancement mode MOSFET, the resistor 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.