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Lighting Ballast

a fluorescent lamp electronic ballast is prov

Fluorescent lamps with
electronic ballast
is used in the aircraft industry because of the efficiency of fluorescent lighting technology. Conventional aircraft generators produce an AC voltage of nearly constant frequency. The conventionalfluorescent lamp electronic ballast accommodates the nearly constant frequency AC voltage and drives one or more lamps with reasonable performance.

Recently, aircraft manufacturers have begun to employ wild frequency generators. Wild frequency AC generators are not able to control the output frequency of the generated waveform. The output frequency of the generator varies with the enginespeed of the aircraft, typically producing a waveform with frequencies between 300 Hz and 800 Hz. Due to the reduction in generator complexity, wild frequency generators are more reliable, lighter, and result in lower maintenance costs when compared toconventional aircraft generators. However, conventional fluorescent lamp electronic ballasts are not able to accommodate the varying-frequency input.

Conventional ballasts that use a hold-up capacitor or passive power factor correction (PFC) L-C filters on the input are not able to operate with a varying frequency. At higher frequencies, these conventional ballasts draw excessive current,exhibit poor power factor, and exhibit poor total harmonic distortion (THD). PFC boost converters have been used in ballasts, but the boost converter topology creates inrush current at turn on. An existing inverter ballast circuit is shown in U.S. Pat. No. 5,466,992.

A recent development used in certain specific 50/60 Hz applications is the PFC flyback topology, which is intended to operate over a frequency range of 45 Hz to 66 Hz. The topology is centered on the L6561 integrated circuit from STMicroelectronics. Some background information may be found in ST Microelectronics application notes AN1059 "Design Equations Of High-Power-Factor Flyback Converters Based On The L6561," AN1060 "Flyback Converters With The L6561 PFC Controller," andAN1089 "Control Loop Modeling Of L6561-Based TM PFC." However, these recent developments have only been discussed for certain specific 50/60 Hz applications and fail to discuss problems that arise with a wild frequency generator power source.

In carrying out the above object, a fluorescent lamp electronic ballast is provided. The ballast comprises a power factor correction flyback circuit and an inverter ballast circuit. The power factor correction flyback circuit is composed of arectifier connected to a DC to DC flyback converter. The flyback converter includes a flyback transformer connected to a diode/capacitor combination. The flyback converter includes a switch used to switch the flyback transformer during operation toproduce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor. The inverter ballast circuit receives the DC output and inverts the DC output to an AC signal for operating the fluorescent lamp. The flybackconverter may provide input to output isolation. The input voltage may be stepped up or stepped down.

At a more detailed level, the present invention comprehends a PFC flyback topology capable of operation over a wide range of frequencies and having low in-rush current at turn on. The preferred PFC flyback circuit implementation has severalaspects that make wide frequency range operation and low in-rush current at turn on possible. In the most preferred implementation, the PFC flyback circuit provides high power factor and low total harmonic distortion (THD) over a wide range offrequencies ranging from 60 Hz to 800 Hz. One aspect that serves to broaden the range of accommodated AC input frequencies received at the rectifier is that the rectifier has a sufficiently low input capacitance (preferably less than 0.5 microfarads)such that the rectifier output substantially takes the form of a rectified AC wave.

An additional aspect of the preferred PFC flyback circuit is the ability to produce multiple DC output supplies. In a preferred implementation, the inverter ballast includes a self-oscillating resonant circuit including a pair of powertransistors. The flyback converter is further used to create a DC bias for use by the power transistors. This technique reduces dissipated power in the bias supply when compared to traditional biasing techniques. Further, a similar approach may beutilized to supply power to arc detect and dim control circuitry when provided. It is appreciated that the flyback converter has a number of advantages in a lamp electronic ballast including the ability to regulate over a very wide variation in inputvoltage. Thus, for low line or high line conditions, the ballast light output remains unchanged. In addition, the preferred flyback circuit provides short circuit protection from gross output short circuit conditions.

Find Lighting Ballast On eBay Below:

2 TXF131A317MVWPLN850 2x2 Lay in LIGHT FIXTURE 120 277 BALLAST
2 TXF131A317MVWPLN850 2x2 Lay in LIGHT FIXTURE 120 277 BALLAST
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Philips Advance ICN 3P32 N F32T8 3 Lamp Ballast T8 lights
Philips Advance ICN 3P32 N F32T8 3 Lamp Ballast T8 lights
$8.00
GE FILTRGARD LUMINAIRE BALLAST H2115L NEW IN BOX 150W 120V LIGHT FIXTURE
GE FILTRGARD LUMINAIRE BALLAST H2115L NEW IN BOX 150W 120V LIGHT FIXTURE
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36W Fluorescent Lamps Electronic Ballast for H Tube Dome light Crystal lamp
36W Fluorescent Lamps Electronic Ballast for H Tube Dome light Crystal lamp
$5.63
ALP Lighting EFP SL32GS Low Profile Fluorescent Emergency Ballast 120V 277VAC F6
ALP Lighting EFP SL32GS Low Profile Fluorescent Emergency Ballast 120V 277VAC F6
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C240PUNVHP B Universal Lighting Ballast for 2 PL L Lamps
C240PUNVHP B Universal Lighting Ballast for 2 PL L Lamps
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NEW Cooper Lighting OCV Ballast 220C173 220C173G20
NEW Cooper Lighting OCV Ballast 220C173 220C173G20
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5 Sage Lighting NLU224T5RS ROHS 120V To 277V Electronic Ballast Class P T5HO
5 Sage Lighting NLU224T5RS ROHS 120V To 277V Electronic Ballast Class P T5HO
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GE Lighting 62044 GE432MVPSN V03W T8 Ballast 4N
GE Lighting 62044 GE432MVPSN V03W T8 Ballast 4N
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Venture Lighting 775w PSMH ballast 480v
Venture Lighting 775w PSMH ballast 480v
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G E Lighting 71730 Electronic Fluorescent Light Ballast For 3 4 T8 T12 Bulbs
G E Lighting 71730 Electronic Fluorescent Light Ballast For 3 4 T8 T12 Bulbs
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NEW SYLVANIA QT3X32 120 QUICKTRONIC 120V AC BALLAST LIGHTING D555094
NEW SYLVANIA QT3X32 120 QUICKTRONIC 120V AC BALLAST LIGHTING D555094
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NEW VALMONT 8G1074W VAL MISER 120V AC BALLAST LIGHTING D555099
NEW VALMONT 8G1074W VAL MISER 120V AC BALLAST LIGHTING D555099
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GE Lighting 23672 GE 232 277 N Electronic Ballast
GE Lighting 23672 GE 232 277 N Electronic Ballast
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Venture Lighting Pulse Start Metal Halide Ballast Kit 875W M166 V90Y8612T
Venture Lighting Pulse Start Metal Halide Ballast Kit 875W M166 V90Y8612T
$40.00
Advance Transformer Ballast R 2SP30 TP in Lithonia Lighting Fluorescent Fixture
Advance Transformer Ballast R 2SP30 TP in Lithonia Lighting Fluorescent Fixture
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GE Magnetic BallastNo 68187 G E Lighting 3PK
GE Magnetic BallastNo 68187 G E Lighting 3PK
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Universal Lighting M400ML5AC4M 500K Metal Halide Ballast
Universal Lighting M400ML5AC4M 500K Metal Halide Ballast
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Lithonia Lighting GT8 232 A12 General Purpose Grid Troffer T8 Ballast 4x1
Lithonia Lighting GT8 232 A12 General Purpose Grid Troffer T8 Ballast 4x1
$44.99
Venture Lighting 1000w 480V Pulse Start Metal Halide Ballast Kit V90Y7811T
Venture Lighting 1000w 480V Pulse Start Metal Halide Ballast Kit V90Y7811T
$40.00
LOT OF 4 SuperDim Ballast B214PUNVSV3 D120 277V DIMMABLE UNIVERSAL LIGHTING
LOT OF 4 SuperDim Ballast B214PUNVSV3 D120 277V DIMMABLE UNIVERSAL LIGHTING
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Advance RM 2SP30 TP Rapid Start Ballast for 2 lights bulbs f30
Advance RM 2SP30 TP Rapid Start Ballast for 2 lights bulbs f30
$24.95
Universal Lighting Metal Halide Ballast For250 Watt H 37 Bulb M250MLTACA4H 500K
Universal Lighting Metal Halide Ballast For250 Watt H 37 Bulb M250MLTACA4H 500K
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Atlas Lighting MH250 0145MOG Metal Halide HID Ballast Lamp Replacement Kit
Atlas Lighting MH250 0145MOG Metal Halide HID Ballast Lamp Replacement Kit
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USED POWER LIGHTING 140CL 120 8G1085G11 BALLAST FREE SHIPPING
USED POWER LIGHTING 140CL 120 8G1085G11 BALLAST FREE SHIPPING
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New in Box Lumark HPSS 1000 MT Lighting Ballast
New in Box Lumark HPSS 1000 MT Lighting Ballast
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Replacement Electronic Flourescent light ballast RF 1P32RN A1
Replacement Electronic Flourescent light ballast RF 1P32RN A1
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SOLA ISB 277V 090A LIGHTING LIGHT RAPID START BALLAST E420 T 2110 SW E420T2110
SOLA ISB 277V 090A LIGHTING LIGHT RAPID START BALLAST E420 T 2110 SW E420T2110
$12.00
POWER LIGHTING 8G1201W Rapid Start 2 Lamp Fluorescent Light Ballast
POWER LIGHTING 8G1201W Rapid Start 2 Lamp Fluorescent Light Ballast
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5 CFL Ballast Ge Lighting GEC 242 MVPS 3W
5 CFL Ballast Ge Lighting GEC 242 MVPS 3W
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Universal Lighting High Pressure Sodium Ballast Kit 100W S54 120V 277V 71A8091
Universal Lighting High Pressure Sodium Ballast Kit 100W S54 120V 277V 71A8091
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Universal Lighting Tech Watt Reducer 446 L SLH TC P Rapid Start Ballast 120V
Universal Lighting Tech Watt Reducer 446 L SLH TC P Rapid Start Ballast 120V
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ELLIPTIPAR LIGHTING RAPID START BALLAST CFM42W GX24Q LAMP 277V 11A HEXO H142 A
ELLIPTIPAR LIGHTING RAPID START BALLAST CFM42W GX24Q LAMP 277V 11A HEXO H142 A
$25.00
Robertson HP21327P 277v 60hz 16A Lighting Electronic Ballast
Robertson HP21327P 277v 60hz 16A Lighting Electronic Ballast
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GE Lighting 120 277 Volt UltraMax High Efficiency Electronic Ballasts 72262
GE Lighting 120 277 Volt UltraMax High Efficiency Electronic Ballasts 72262
$7.00
9 1 2 CFL Ballast Ge Lighting GEC340MAX A
9 1 2 CFL Ballast Ge Lighting GEC340MAX A
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GE Lighting 23 Watts 1 Lamps HID Ballast GEMH20 MC 120
GE Lighting 23 Watts 1 Lamps HID Ballast GEMH20 MC 120
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BALLAST ELECTRONIC ACCUSTART UNIVERSAL LIGHTING B228PUNV C T5 120 277 VOLT NEW
BALLAST ELECTRONIC ACCUSTART UNIVERSAL LIGHTING B228PUNV C T5 120 277 VOLT NEW
$24.99
advance lighting ballast
advance lighting ballast
$8.00
QTY MAGNETEK AND ADVANCED UNUSED LIGHTING BALLASTS
QTY MAGNETEK AND ADVANCED UNUSED LIGHTING BALLASTS
$149.99


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