Patent ID: 8279638
Filing Date: 2012-10-02
Classification: H02M

Abstract:
1. A method for output regulation of a power converter, the power converter including a power switch, comprising the following steps: obtaining a first divided voltage divided from an input voltage from a primary winding of the power converter, during an on-time period of the power switch of the power converter; transforming the first divided voltage to a first current; mirroring the first current to a charging current signal; charging an energy storage device by the charging current signal; comparing a voltage limited signal of the energy storage device with a reference voltage; and resetting a switch signal when the voltage limited signal is greater than the reference voltage to control the power switch of the power converter without sensing resistors, which is adapted to directly sense a switch current of the power switch, and current sensing loss wherein a flip-flop resets the switch signal when the voltage limited signal is greater than the reference voltage to control the power switch directly of the power converter, and the flip-flop includes a D-input terminal, a clock-input terminal, a reset-input terminal and an output terminal, the clock-input terminal is connected to an oscillation circuit, the D-input terminal is connected to an auxiliary winding of the power converter, the reset-input terminal is connected to an output terminal of a comparator, which utilized to compare the voltage limited signal and the reference voltage, and the output terminal is connected to the power switch to reset the switch signal.