H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/298 (2006.01) H05B 41/29 (1995.01)
Patent
CA 2160309
To prevent operation of an inverter starting and oscillation control circuit for one or more fluorescent lamps (LP1; LP4; LP5; LP6; LP20, LP21; LP30, LP31) if electrode filaments (E10, E11; E20, E21, E22, E23; E30, E31, E32, E33; E40, E41; E50, E51; E60, E61) of any one of the lamps should be broken, a high-resistance d-c path is provided which connects the energy supply source with the control circuit (ST1; ST2; ST3; RK4b, C43; RK5b, RK5c; C54; L6c, C67) for the inverter circuit, so that, if one of the electrodes (E10, E11; E20, E21, E22, E23; E30, E31, E32, E33; E40, E41; E50, E51; E60, E61) should be broken, oscillation of the inverter, typically a half-bridge transistor or MOSFET circuit, is prevented. The circuit is particularly suitable to operate compact fluorescent lamps in which the operating voltage is in excess of the input voltage supplied to the inverter, and which requires resonant voltage enhancement during operation, and after ignition.
Reiser Ludwig
Roll Ulrich
Fetherstonhaugh & Co.
Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh
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