Patent ID: 8704590
Filing Date: 2014-04-22
Classification: G05B,H02M

Abstract:
1. A control circuit of a power converter, comprising: a shared pin, for coupling with an output end of a power converter through a resistor; a driving circuit, for coupling with a switch of the power converter to configure a conduction status of the switch; a current source circuit, coupled with the shared pin, for providing a current to the resistor through the shared pin in a first period; a sampling circuit, coupled with the shared pin, for sampling a signal on the shared pin in a first interval and a second interval of the first period to respectively generate a first sampling value and a second sampling value; and a signal processing circuit, coupled with the shared pin of the sampling circuit, for comparing the first sampling value with a first reference value, comparing the second sampling value with a second reference value, calculating a first difference between the first sampling value and the first reference value, and calculating a second difference between the second sampling value and the second reference value; wherein in response to a detection by the signal processing circuit that a difference between the first difference and the second difference is less than a predetermined value, the signal processing circuit receives an output signal on the output end through the shared pin, and configures at least one of a conduction time and a conduction frequency of the switch through the driving circuit according to at least one of the output signal and a computation value calculated according to the output signal.