Patent ID: 8582323
Filing Date: 2013-11-12
Classification: H02M

Abstract:
1. A controller for a primary-side regulated control power supply unit, comprising: a control output that can be connected to the control input of a primary-side switch of the control power supply unit; a voltage measurement input for sensing of an auxiliary voltage that is induced as a function of the secondary-side output voltage, wherein the auxiliary voltage is sensed from a primary-side auxiliary winding of a transformer; an error amplifier for a comparison of the sensed auxiliary voltage with a reference value and for the amplification of the deviation between the sensed auxiliary voltage and the reference value; and a return branch that couples the error amplifier with the voltage measurement input such that the output signal of the error amplifier is returned to the voltage measurement input, wherein the return branch comprises a return switch that conducts when the signal at the control output indicates that the primary-side switch is switched on.