Patent ID: 6160385
Filing Date: 2000-12-12
Classification: H02M,Y02B,Y02P

Abstract:
A circuit configuration for providing a substantially load-independent output voltage, comprising:a current control assembly for controlling a mains current consumption, said current control assembly having an AC voltage terminal for receiving a mains voltage and having two output terminals;a rectifier assembly connected to said output terminals of said current control assembly, said rectifier assembly having output terminals carrying an output voltage;a voltage measurement arrangement connected to said output terminals of said rectifier assembly, said voltage measurement arrangement having an output terminal outputting a voltage signal; anda feedback branch having a voltage control arrangement connected between said output terminal of said voltage measurement arrangement and said current control assembly for feeding the voltage signal to said current control assembly, said voltage control arrangement including a sample and hold circuit evaluating said voltage signal during sampling intervals and forming an evaluation therefrom;said sample and hold circuit comprises an amplifier for sampling the voltage signal;said amplifier having a first input terminal connected to the output terminal of said voltage measurement arrangement, a control input for controlling an amplification of said amplifier, and an output terminal outputting an output signal; said output signal representing said evaluation during the sampling intervals and controlling said current control assembly;said voltage control arrangement controlling the amplification of said amplifier and having a first input terminal receiving said AC main voltage and an output terminal connected to said control input of said amplifier;said voltage control arrangement and said amplifier setting a duration of said sampling intervals depending on said AC mains voltage upon said rectified AC mains voltage.