Output Regulation Circuit of a Power Converter without Current Sensing Loss and Method Thereof

摘要

An output regulation circuit of a power converter without current sensing loss includes a transforming circuit to receive a proportional voltage from the primary winding of the power converter. The first proportional voltage is transformed to a charging current signal. When the power switch during on-time period, the charging current signal charges an energy storage device. Thus, the circuit controls the power switch according to a voltage limited signal of the energy storage device.