LONG V NGUYEN
Nail Technician in Pt Of Pines, MA
License number
Massachusetts 3034402
Issued Date
Jan 12, 2005
Expiration Date
Oct 13, 2014
Type
Manicurist Type 3
Address
Address
Pt Of Pines, MA 02151
Professional information
Starting And Operating Circuit For Arc Discharge Lamp
US Patent:
5138235, Aug 11, 1992
Filed:
Mar 4, 1991
Appl. No.:
7/664161
Inventors:
Yiyoung Sun - Danvers MA
Long T. Nguyen - Revere MA
Long T. Nguyen - Revere MA
Assignee:
GTE Products Corporation - Danvers MA
International Classification:
H05B 4136
US Classification:
315209R
Abstract:
A circuit for starting and operating a discharge lamp, such as a compact fluorescent lamp, at high frequency from an 60 Hz AC supply. The circuit includes a power supply for generating a DC voltage coupled to a pair of AC input terminals. A DC/AC converter includes an oscillator having a pair of semiconductor switches coupled in parallel with the DC power supply. an oscillator starting circuit is coupled to one of the semiconductor switches and includes a series circuit comprising a resistor, capacitor and threshold element. The input of the oscillator starting circuit is coupled to one of the AC input terminals so as to prevent a momentary flicker in the lamp after the AC supply is removed and the lamp has extinguished. In accordance with another aspect of the invention, the oscillator includes fusible circuit elements which render the oscillator inoperable upon failure of the lamp due to depletion of emissive material on at least one of the lamp electrodes.