Circuit for operating incandescent bulbs with an overload detect

Details Circuit for operating incandescent bulbs with an overload detect Circuit for operating incandescent bulbs with an overload detect

1997-08-15

1999-01-26

Pascal, Robert

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Supply circuit current and/or potential actuated switch

315225, H05B 3904

Patent

active

058642110

ABSTRACT:
A circuit arrangement for operating electrical incandescent bulbs, particrly low-volt halogen incandescent bulbs, comprises an inverter in the half-bridge circuit and an overload detector circuit, which comprises a current-voltage transformer, e.g., a resistance (R4), which is serially connected between first half-bridge capacitor (C3) and ground potential. The current-voltage transformer controls a signal-conditioning and cutoff circuit (R5-R7, C4, C5, D4, T3), which disconnects the inverter at least temporarily in the case of overload or short circuit. Preferably, current-voltage transformer (R4) of the overload detector circuit is a component of a frequency adaptation circuit (L1, R4), which opposes a decrease in the frequency of the inverter in the upper power connection range. This variant is particularly cost-favorable, since in this case, no additional component is required for detector circuit (R4).

REFERENCES:
patent: 5740021 (1998-04-01), Lecheler et al.

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