Circuit arrangement for operating electrical incandescent bulbs

Details Circuit arrangement for operating electrical incandescent bulbs Circuit arrangement for operating electrical incandescent bulbs

H - Electricity

05

B

H05B 39/00 (2006.01) H02H 7/122 (2006.01) H05B 39/04 (2006.01) H02M 7/5383 (2006.01)

Patent

CA 2213426

A circuit arrangement for operating electrical incandescent bulbs, particularly 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).

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