Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1992-03-23
1998-01-20
Yoo, Do Hyun
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315200R, 315307, 315DIG4, 315DIG5, 315DIG7, H05B 4136
Patent
active
057104883
ABSTRACT:
A bridge rectifier is connected with a 277Volt/60 Hz power line and provides full-wave-rectified unfiltered DC voltage to a series-combination of: i) an inductor, ii) a full bridge inverter switched in synchronism with the 60 Hz power line voltage, and iii) an electronic switching device. A fluorescent lamp is connected with the inverter's output and receives 60 Hz current of exceptionally low crest-factor, thereby operating at an exceptionally high efficacy. The electronic switching device is normally in a fully conductive state. However, it is controlled--by a photo sensor responsive to the light output of the fluorescent lamp--in such a manner that whenever the instantaneous light output exceeds a certain adjustably predetermined upper level, it switches into a non-conductive state where it remains until the instantaneous light output level diminishes to a certain adjustably predetermined lower level. Whenever the electronic switching device is switched off while current flows through the inductor, a flywheel diode shunts the current away from the switching device and into an energy-storing capacitor, the DC voltage on which is used for filling-in the valleys between the individual 120 Hz DC pulses on the unfiltered power supply.
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