Patent ID: 8665612
Filing Date: 2014-03-04
Classification: H02M

Abstract:
1. A constant current controller for a constant current power module, comprising: a demagnetization sensing unit, used for detecting the voltage variation of a detection signal to generate a discharging time signal, wherein said detection signal is derived from an auxiliary coil, and said discharging time signal has an active period corresponding to a secondary side discharging time; a secondary side current sensing unit, used for detecting a peak value of a current sensing signal, and providing an output current according to said peak value of said current sensing signal under the control of said discharging time signal, wherein said current sensing signal is corresponding to a primary side current; and an error current generator, used for generating an error current according to the difference between said output current and a reference current, wherein said error current is converted to a threshold voltage by a first capacitor.