Title:
RARE GAS DISCHARGE LAMP LIGHTING DEVICE
Document Type and Number:
Japanese Patent JP3880247
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To simplify a driving circuit by installing an inverting circuit for on/off converting a first switching element series to a primary coil of an output transformer in a high frequency generating circuit; a driving circuit for selectively giving a self exciting driving signal of an exciting coil generating voltage; and an initial driving circuit.
SOLUTION: A rare gas discharge lamp DL has a high frequency generating circuit HC comprising a first switching element S1 connected in series to a primary coil Lp of an output transformer TR connected to a secondary coil Ls; a current detecting circuit R1 series to the first switching element S1; a reversing circuit OS; a driving circuit PDA; an initial driving circuit R2; and a capacitor CA. The driving circuit PDA is composed of a single directional element D1 connected to the winding start end of an exciting coil Le and a resistance R4 series to the element D1. A specified polarity component of different polarity voltage induced at suitable timing in the exciting coil Le during operation is applied to the first switching element S1 as a driving signal to turn on by self excitation.
Inventors:
Isao Shikata
Application Number:
JP18264199A
Publication Date:
February 14, 2007
Filing Date:
June 29, 1999
Export Citation:
Assignee:
NEC Lighting, Ltd.
Ushio, Inc.
Ushio, Inc.
International Classes:
H05B41/24; H02M7/48; H02M7/537; (IPC1-7): H05B41/24; H02M7/48; H02M7/537
Domestic Patent References:
| JP11162690A | ||||
| JP57187896A | ||||
| JP8340675A | ||||
| JP2000243591A | ||||
| JP2000200690A | ||||
| JP11204280A |
Attorney, Agent or Firm:
Akio Miyazaki
Ishibashi Masayuki
Masaaki Ogata
Ishibashi Masayuki
Masaaki Ogata
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