Patent ID: 6259213
Filing Date: 2001-07-10
Classification: H05B,Y10S

Abstract:
Circuit arrangement for operating at least one low-pressure discharge lamp, comprising:a mains voltage rectifier (GL),a capacitor (C2), connected in parallel with the DC voltage output (+,-) of the mains voltage rectifier (GL),an inverter (Q1, Q2) having a DC voltage input and a voltage output (M),a load circuit designed as a series resonant circuit, which is connected to the voltage output (M) of the inverter (Q1, Q2), the load circuit having at least one resonance capacitor (C6), a lamp inductor (L5) and terminals (j5, j6, j7, j8) for at least one low-pressure discharge lamp (LP1, LP2),a smoothing capacitor (C3) connected in parallel with the DC voltage input of the inverter (Q1, Q2),a harmonic filter having a sole diode (D1) and at least one capacitor (C7),a first terminal of the capacitor (C7) of the harmonic filter is connected to the resonance capacitor (C6), to a first electrode of the diode (D1) of the harmonic filter and to the DC voltage output (+,-) of the mains voltage rectifier (GL),the second terminal of the capacitor (C7) of the harmonic filter is connected to the voltage output (M) of the inverter (Q1, Q2),the second electrode of the diode (D1) of the harmonic filter is connected to the smoothing capacitor (C3).