CIRCUIT ARRANGEMENT FOR OPERATING A VACUUM GAS DISCHARGE LAMP

• US 20100102738A1
• Filed: 04/23/2007
• Published: 04/29/2010
• Est. Priority Date: 04/23/2007
• Status: Abandoned Application

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Reiter, Bernhard, Busse, Olaf
• Application Number:
  US12/532,158
• Publication Number:
  US 20100102738A1
• Time in Patent Office: Days
• US Class Current: 315/219
• CPC Class Codes: H05B 41/295 with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps

Abstract

A circuit arrangement for operating a low-pressure gas discharge lamp with a first and a second filament, between which a gas discharge can be formed, is provided. The circuit arrangement may include a device for generating an electrical potential which varies over time at a node, which is connected to the first filament via a first inductive element, and a half-circuit, which includes a switch, the first filament being electrically connected to the second filament when the switch of the half-circuit is closed, wherein a second inductive element is provided in the half-circuit.

Claims

1. A circuit arrangement for operating a low-pressure gas discharge lamp with a first and a second filament between which a gas discharge can be formed, the circuit arrangement comprising:

a device for generating an electrical potential which varies over time at a node, which is connected to the first filament via a first inductive element, and a half-circuit, which comprises a switch, the first filament being electrically connected to the second filament when the switch of the half-circuit is closed,

wherein a second inductive element is provided in the half-circuit.

2. The circuit arrangement as claimed in claim 1,

wherein the second inductive element is magnetically coupled to the first inductive element.

3. The circuit arrangement as claimed in claim 2,

wherein the first and the second inductive element are provided by in each case at least one winding on a common coil former.

4. The circuit arrangement as claimed in claim 2,

wherein the second inductive element is coupled to the first inductive element in such a way that, when the switch is open, part of the voltage drop between the first and the second filaments drops across the second inductive element.