Patent ID: 8212403
Filing Date: 2012-07-03
Classification: H02J,Y02B,Y04S

Abstract:
1. A circuit for controlling the operation of a backup power supply comprising: a switch unit having an input terminal and an output terminal; a control unit having, respectively, first input terminal, second input terminal, third output terminal, fourth output terminals, fifth input terminal, and sixth input terminal; and a processing unit having an input terminal and one or more output terminals; wherein the input terminal of the switch unit is configured to be operably coupled to an output terminal of an external power supply; the first input terminal of the control unit is configured to be operably coupled to an output terminal of a backup power supply; the second input terminal of the control unit is configured to be operably coupled to the output terminal of the switch unit; the third and forth output terminals of the control unit are, respectively, configured to be operably coupled to the input terminal of the processing unit; the fifth and sixth input terminals of the control unit are, respectively, configured to be operably coupled to a respective output terminal of the processing unit; and the control unit is configured to turn on and off the backup power supply, wherein the control unit further comprises a first PMOS transistor, a second PMOS transistor, a first resistor, a second resistor, an optical coupler and a third MOS transistor; wherein