Patent ID: 6185117
Filing Date: 2001-02-06
Classification: H02M,Y02B

Abstract:
System adapted to be connected to an AC line voltage including a bridge converter whose active arm includes switching means and whose passive arm includes capacitors, said converter delivering to an output load a high-frequency alternating current of substantially constant amplitude, whereas the AC line current remains substantially sinusoidal and in phase with the voltage thanks to the recovery in energy transfer mode of a portion of the high-frequency energy developed between the midpoint of said passive arm and polarized common terminals by virtue of the reactance of said passive arm, which enables, after rectification of said energy portion by a full-wave rectifier bridge including diodes, a low-frequency envelope to be obtained between the terminals of a decoupling capacitor which, when added to the rectified AC line current signal present between a polarized output terminal of an AC line voltage rectifier bridge and one of the polarized common terminals, compensates the effect of the low impedance of a decoupling capacitor, reflected in low residual ripple between the polarized common terminals and virtually perfect compensation of the power factor and the harmonic distortion of the AC line current, wherein a substantially constant amplitude buffer DC voltage source forms with the output load a series circuit which is connected between the midpoint of the active arm and a non-polarized input terminal of the full-wave rectifier bridge, said voltage source having negligible impedance to the flow of said high-frequency alternating current.