Safety starter device
AssigneeKoninklijke Philips Electronics N.V.
InventorThanh Tam Nguyen
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Abstract
A safety starter circuit for a gas discharge lamp is described, comprising a series arrangement of: a glow switch starter (5); at least one resistive element (9); a thermally controlled switching element (8). The thermally controlled switching element (8) is in a heat transfer relationship with the resistive element (9) so that the thermally controlled switching element (8) is effectively heated by heat generated in the resistive element (9). The thermally controlled switching element (8) is designed to make a transition from a conductive state to a non-conductive state when its temperature exceeds a predetermined cut-off temperature. According to the invention, the thermally controlled switching element (8) is arranged in a gas-tight casing (7a).
Claims4
Safety starter device (10) for a gas discharge lamp (1), comprising a series arrangement of:
- a glow switch starter (5);
- at least one resistive element (9);
- a thermally controlled switching element (8);
- wherein the thermally controlled switching element (8) is in a heat transfer relationship with the resistive element (9) so that the thermally controlled switching element (8) is effectively heated by heat generated in the resistive element (9);
- and wherein the thermally controlled switching element (8) is designed to make a transition from a conductive state to a non-conductive state when its temperature exceeds a predetermined cut-off temperature;
- characterized in that at least the thermally controlled switching element (8) is arranged in a gas-tight casing (7a).
Dependencies are inferred from the claim text.