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US3869631A - Diode-containing incandescent lamp having improved efficiency - Google Patents

Diode-containing incandescent lamp having improved efficiency Download PDF

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Publication number
US3869631A
US3869631A US474991A US47499174A US3869631A US 3869631 A US3869631 A US 3869631A US 474991 A US474991 A US 474991A US 47499174 A US47499174 A US 47499174A US 3869631 A US3869631 A US 3869631A
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lamp
diode
filament
lead
wires
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Expired - Lifetime
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US474991A
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Warren A Anderson
Edmund M Passmore
Wilfrid G Matheson
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GTE Sylvania Inc
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GTE Sylvania Inc
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Priority to US474991A priority Critical patent/US3869631A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp

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  • 26 taining a gas fill and a tungsten filament has a diode in series with the filament and positioned between the 1973 abandoned.
  • This invention relates to incandescent lamps such as are commonly used for home lighting, and relates especially to A line gas filled incandescent lamps, that is, those having an A bulb and a wattage between about 40 and 150 watts.
  • the design of such lamps has become sufficiently standardized over the years so that the parameters of lamp construction for any particular type are almost identical between lamp manufacturers.
  • the 60 watt, A19 bulb, 120 volt, 1,000 hour life lamp of all manufacturers uses a filament made of tungsten wire having a weight of about 6.6 mg per 200 mm of wire.
  • the efficiency of the lamp is about 14 lumens per watt.
  • the wire weight for the filament of a 75 watt, 120 volt 750 hour lamp is about 9.1 mg per 200 mm and that for a similar 100 watt lamp is about 12.3 mg per 200 mm.
  • This invention is concerned with an improvement in A line incandescent lamps that results in increased efficiency, that is to say, greater lumens per watt, without reducing the life of the lamp.
  • Such an improvement has become especially desirable in recent years because of the growing energy shortage and the desirability of more efficiently utilizing the electric power produced in this country.
  • the improvement is obtained by inserting a diode between the screw base of the lamp and the stern press of the lamp, the diode being in series with the lamp filament.
  • a diode does not increase the size of the lamp or the base and permits the lamps to be made on presently used high speed lamp making machines.
  • Such a construction also does not expose the diode to the high temperatures that it would be subjected to if it were located within the glass bulb.
  • the tungsten filaments be made of wire having a weight about 50 percent greater than is normally used for the particular lamp under consideration. The reason for this is that the diode rectifies the normal AC line voltage and subject the tungsten filament to a pulsed DC voltage of lower value than that of the AC voltage.
  • the single figure in the drawing is an elevational view, partly in section, of an incandescent lamp in accordance with this invention.
  • the lamp comprises a glass bulb I having a gaseous filling, usually a mixture of argon and nitrogen for the A line lamps with which this invention is concerned.
  • the bottom of bulb l is sealed to flare 2 of the usual stem press glass mount 10.
  • Lead-in wires 3 extend through and are supported by stem press 4 of glass mount 10.
  • a coiled tungsten filament 5 is supported between the upper ends of lead-in wires 3.
  • Lead-in wires 3 extend downward between tipped off exhaust tube 6 and flare 2.
  • One of the lead-in wires is connected to center contact 7 of the usual screw base 8 which is fastened to the bottom of bulb 1.
  • diode 9 which in turn is connected to the rim of base 8, thus placing diode 9 in series with filament 5.
  • Diode 9 may be positioned within the space between exhaust tube 6 and flare 2 or it may be positioned between mount 10 and base 8.
  • Filament 5 is made of tungsten wire having a wire weight about 50 percent greater than is normally used for the lamp as determined by its rating.
  • Lamp in accordance with this invention would use 9.9, 13.7 and 18.4 mg per 200 mm wire, respectively.
  • the prior art discloses the use of diodes in incandescent lamps for the purpose of providing different levels of illumination.
  • the diode is not in the filament circuit when normal lamp brightness is desired; it is in the circuit only when reduced illumination is desired.
  • diode 9 is always in the circuit with filament 5.
  • lamp efficiency can be increased by the use of a diode in series with the lamp filament.
  • lamp efficiency is decreased about 50 percent when the diode is in the circuit. In one example of such a 60 watt lamp, the lamp efficiency was 13.5 lumens per watt with the diode out of the circuit, and only 6.3 lumens per watt with the diode in.
  • the filament temperature of prior art diodecontaining lamps is about 2,200 to 2,500Kelvin when the diode is in series with the filament during lamp operation.
  • the relationship of diode 9 to filament 5 is such that the filament temperature during normal lamp operation is at least about 2,600K.
  • This filament temperature is dependent on, inter alia, lamp wattage and rated life; it varies from about 2,650K for a 60 watt, 2,500 hour lamp to about 2,875K for a watt, 750 hour lamp.
  • An incandescent lamp comprising: a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount; a screw base having a center contact attached to the lower end of said envelope; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a diode electrically connected between one of said lead-in wires and said base; and a coiled tungsten wire filament disposed within said envelope and connected between said two lead-in wires, the relationship between the diode and the filament being such that the filament temperature during normal lamp operation is at least 2,600 Kelvin.

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Abstract

An incandescent lamp, having a glass envelope containing a gas fill and a tungsten filament, has a diode in series with the filament and positioned between the screw base of the lamp and the stem press of the lamp. The filament is made of tungsten wire having a wire weight about 50% greater than is normal for the lamp rating.

Description

Mar. 4, 1975 DIODE-CONTAINING INCANDESCENT [561 References Cited UNITED STATES PATENTS LAMP HAVING IMPROVED EFFICIENCY Inventors: Warren A. Anderson, Danvers;
Edmund PaS5mre- Wilmingtom 2 896 125 7/1959 Morton....................... both of Mass; Wilfrid G. Matheson, 31387g7 6/1964 p h San Di g Calif- 3,148,305 9/1964 Pearson [73] Assignee: GTE Sylvania Incorporated,
Danvers, Mass Primary Eruminer-Siegfried H. Grimm Attorney, Agent, or Firm lames Theodosopoulos 22 Filed: May 3!, 1974 [21] Appl. No; 474,991
57 ABSTRACT An incandescent lamp, having a glass envelope con- Related US. Application Data (ontinuation-in-part of Scrl No. 335,922. Feb.
26 taining a gas fill and a tungsten filament, has a diode in series with the filament and positioned between the 1973 abandoned.
m m n nlawm 6 m hoo .mr v warm 1 S m e e r rm u mm g .l mn F S g B t g m m w U1; r dt D m 0t 1 0. mdfl hm a c l. e 7 hS C tins l f 0mm 8 O a aw w flt. w h g .w. .m u m STWWI .L QRW 30U30 0 0 UOM 13H 9/ O 1 .2 :4 B7 2 3/ 1 WU U m 3 u. 1 n m m .c H Hr. n a .e m l C l H 5 min U IF w 8 5 55 i ii DIODE-CONTAINING INCANDESCENT LAMP HAVING IMPROVED EFFICIENCY This application is a continuation-in-part of Ser. No. 335,922, filed Feb. 26, 1973 and now abandoned.
This invention relates to incandescent lamps such as are commonly used for home lighting, and relates especially to A line gas filled incandescent lamps, that is, those having an A bulb and a wattage between about 40 and 150 watts.
The design of such lamps has become sufficiently standardized over the years so that the parameters of lamp construction for any particular type are almost identical between lamp manufacturers. For example, the 60 watt, A19 bulb, 120 volt, 1,000 hour life lamp of all manufacturers uses a filament made of tungsten wire having a weight of about 6.6 mg per 200 mm of wire. The efficiency of the lamp is about 14 lumens per watt.
The wire weight for the filament of a 75 watt, 120 volt 750 hour lamp is about 9.1 mg per 200 mm and that for a similar 100 watt lamp is about 12.3 mg per 200 mm.
This invention is concerned with an improvement in A line incandescent lamps that results in increased efficiency, that is to say, greater lumens per watt, without reducing the life of the lamp. Such an improvement has become especially desirable in recent years because of the growing energy shortage and the desirability of more efficiently utilizing the electric power produced in this country.
The improvement is obtained by inserting a diode between the screw base of the lamp and the stern press of the lamp, the diode being in series with the lamp filament. Such a construction does not increase the size of the lamp or the base and permits the lamps to be made on presently used high speed lamp making machines. Such a construction also does not expose the diode to the high temperatures that it would be subjected to if it were located within the glass bulb. In order to obtain the desired increased efficiency, it is necessary that the tungsten filaments be made of wire having a weight about 50 percent greater than is normally used for the particular lamp under consideration. The reason for this is that the diode rectifies the normal AC line voltage and subject the tungsten filament to a pulsed DC voltage of lower value than that of the AC voltage.
The single figure in the drawing is an elevational view, partly in section, of an incandescent lamp in accordance with this invention. The lamp comprises a glass bulb I having a gaseous filling, usually a mixture of argon and nitrogen for the A line lamps with which this invention is concerned. The bottom of bulb l is sealed to flare 2 of the usual stem press glass mount 10. Lead-in wires 3 extend through and are supported by stem press 4 of glass mount 10. A coiled tungsten filament 5 is supported between the upper ends of lead-in wires 3. Lead-in wires 3 extend downward between tipped off exhaust tube 6 and flare 2. One of the lead-in wires is connected to center contact 7 of the usual screw base 8 which is fastened to the bottom of bulb 1. The other lead-in wire is connected to diode 9 which in turn is connected to the rim of base 8, thus placing diode 9 in series with filament 5. Diode 9 may be positioned within the space between exhaust tube 6 and flare 2 or it may be positioned between mount 10 and base 8.
Filament 5 is made of tungsten wire having a wire weight about 50 percent greater than is normally used for the lamp as determined by its rating. Thus for the 60, and watt lamps previously mentioned, which normally use wire having a weight of'6.6, 9.1 and 12.3 mg per 200 mm, respectively, lamps in accordance with this invention would use 9.9, 13.7 and 18.4 mg per 200 mm wire, respectively.
In one example, 30 A19, 60 watt, volts, 1,000 hour, medium screw base, inside frost incandescent lamps were made in accordance with this invention. Filament 5 was made of 9.95 mg per 200 mm tungsten wire and had a total filament length of 383 mm. A IN5061 diode was connected between a lead-in wire 3 and the rim of base 8 for each lamp. The lamps were operated and measured at their rated voltage, 120volts. The average efficiency of the 30 lamps at their design life of 1,000 hours was 14.77 lumens per watt. In contrast, the efficiency of 30 A19, 60 watt, 120 volts, 1,000 hour, medium screw base, inside frost incandescent lamps used as a control and made in accordance with the prior art, that is to say, with a filament made of 6.6 mg per 200 mm wire, was 13.72 lumens per watt. The improvement in efficiency for lamps in accordance with this invention was 7.7 percent.
The prior art discloses the use of diodes in incandescent lamps for the purpose of providing different levels of illumination. In such lamps, the diode is not in the filament circuit when normal lamp brightness is desired; it is in the circuit only when reduced illumination is desired. In the instant invention, however, diode 9 is always in the circuit with filament 5. Moreover, the prior art does not suggest that lamp efficiency can be increased by the use of a diode in series with the lamp filament. In diode-containing prior art lamps, lamp efficiency is decreased about 50 percent when the diode is in the circuit. In one example of such a 60 watt lamp, the lamp efficiency was 13.5 lumens per watt with the diode out of the circuit, and only 6.3 lumens per watt with the diode in.
The filament temperature of prior art diodecontaining lamps is about 2,200 to 2,500Kelvin when the diode is in series with the filament during lamp operation. In the instant invention, however, the relationship of diode 9 to filament 5 is such that the filament temperature during normal lamp operation is at least about 2,600K. This filament temperature is dependent on, inter alia, lamp wattage and rated life; it varies from about 2,650K for a 60 watt, 2,500 hour lamp to about 2,875K for a watt, 750 hour lamp.
We claim:
1. An incandescent lamp comprising: a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount; a screw base having a center contact attached to the lower end of said envelope; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a diode electrically connected between one of said lead-in wires and said base; and a coiled tungsten wire filament disposed within said envelope and connected between said two lead-in wires, the relationship between the diode and the filament being such that the filament temperature during normal lamp operation is at least 2,600 Kelvin.

Claims (1)

1. An incandescent lamp comprising: a gas filled glass envelope sealed at its lower end to the flare of a stem press glass mount; a screw base having a center contact attached to the lower end of said envelope; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a diode electrically connected between one of said lead-in wires and said base; and a coiled tungsten wire filament disposed within said envelope and connected between said two lead-in wires, the relationship between the diode and the filament being such that the filament temperature during normal lamp operation is at least 2,600* Kelvin.
US474991A 1973-02-26 1974-05-31 Diode-containing incandescent lamp having improved efficiency Expired - Lifetime US3869631A (en)

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US474991A US3869631A (en) 1973-02-26 1974-05-31 Diode-containing incandescent lamp having improved efficiency

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Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984000080A1 (en) * 1982-06-14 1984-01-05 Diolight Techn Inc Extended life incandescent lamp with self-contained diode and reflector
US4461973A (en) * 1982-03-19 1984-07-24 Duro-Test Corporation Energy-efficient incandescent lamp with improved filament characteristics
DE3441065A1 (en) * 1984-11-09 1986-05-15 Matthias Dipl.-Ing. 8069 Wolnzach Boeck Small signalling incandescent lamp for operation on an AC voltage of 220 V
US4591752A (en) * 1983-10-14 1986-05-27 Duro-Test Corporation Incandescent lamp with high pressure rare gas filled tungsten-halogen element and transparent thick walled safety envelope
US4629943A (en) * 1984-06-01 1986-12-16 Ponce Jr Emiliano Long life traffic control lamp and socket insert
WO1988004516A1 (en) * 1984-06-01 1988-06-16 Ponce Emiliano Jr Long life traffic control lamp and socket insert
US4893063A (en) * 1987-10-06 1990-01-09 Joseph Pernyeszi Apparatus for improving the efficiency of a lighting element
US4897578A (en) * 1988-05-09 1990-01-30 Goad Sr Christopher F High efficiency incandescent lamp with diode rectifier
US4922155A (en) * 1988-06-22 1990-05-01 Gte Products Corporation Protective circuit for reduced voltage lamps
US5889369A (en) * 1995-08-08 1999-03-30 Roy; Gilles Incandescent lamp having a lifetime extended by two rectifying diodes and a resistor
US20050110438A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Fixed forward phase switching power supply with time-based triggering
US20050110435A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Phase-control power controller with digital RMS load voltage regulation
US20050110439A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Method of operating a lamp containing a fixed forward phase switching power supply
US20050110432A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Fixed reverse phase switching power supply with time-based phase pulse triggering control
US20050110430A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Method of reducing RMS load voltage in a lamp using pulse width modulation
US20050110436A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Lamp having fixed forward phase switching power supply with time-based triggering
US20050110434A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Phase-control power controller with analog RMS load voltage regulation
US20050110433A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control
US20050110437A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Lamp containing phase-control power controller with analog RMS load voltage regulation
US20050122055A1 (en) * 2005-02-04 2005-06-09 Osram Sylvania Inc. Lamp having fixed phase power controller with analog trigger
US20050122086A1 (en) * 2005-02-04 2005-06-09 Osram Sylvania Inc. Fixed phase power controller with analog trigger
US20050146293A1 (en) * 2005-02-04 2005-07-07 Osram Sylvania Inc. Phase-control power controller for converting a line voltage to an RMS load voltage
US20050146292A1 (en) * 2005-02-04 2005-07-07 Osram Sylvania Inc. Lamp including phase-control power controller with digital RMS load voltage regulation
US20050151487A1 (en) * 2005-04-01 2005-07-14 Osram Sylvania Inc. Method of soft-starting a switching power supply containing phase-control clipping circuit
US20050151488A1 (en) * 2005-04-01 2005-07-14 Osram Sylvania Inc. Method of soft-starting a switching power supply including pulse width modulation circuit
US20050151485A1 (en) * 2005-04-01 2005-07-14 Osram Sylvania Inc. Method of soft-starting a switching power supply having time-based pulse triggering control
US20050151486A1 (en) * 2005-04-01 2005-07-14 Osram Sylvania Inc. Lamp containing soft-start power supply
US20050162102A1 (en) * 2005-04-01 2005-07-28 Osram Sylvania Inc. Lamp containing voltage conversion circuit including forward/reverse hybrid phase-control clipping circuit
US20050162094A1 (en) * 2005-04-01 2005-07-28 Osram Sylvania Inc. Forward/reverse hybrid switching power supply with time-based pulse triggering control
US20050162095A1 (en) * 2005-04-01 2005-07-28 Osram Sylvania Inc. Method of converting a line voltage to an RMS load voltage independently of variations in line voltage magnitude
US20050184683A1 (en) * 2005-02-04 2005-08-25 Osram Sylvania Inc. Method of converting line voltage to an RMS load voltage in a lamp using a phase-control clipping circuit
US20060082320A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit containing a voltage controlled resistor
US20060082328A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with fuse-resistor network for reducing RMS load voltage
US20060082326A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit for reducing RMS load voltage
US20060082327A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with hysteresis control for reducing RMS load voltage
US7049750B1 (en) 2005-06-15 2006-05-23 Osram Sylvania Inc. Lamp having integral voltage controller
US20060175980A1 (en) * 2005-02-04 2006-08-10 Osram Sylvania Inc. Lamp with built-in voltage converter including a bidirectional thyristor diode (SIDAC)
US20060175978A1 (en) * 2005-02-04 2006-08-10 Osram Sylvania Inc. Lamp with integral pulse width modulated voltage control circuit
US20060175979A1 (en) * 2005-02-04 2006-08-10 Osram Sylvania Inc. Method of operating a lamp containing a fixed phase power controller
US20060181190A1 (en) * 2005-02-14 2006-08-17 Chao-Lin Wu Energy-saving lamp
US20060284493A1 (en) * 2005-06-15 2006-12-21 Osram Sylvania Inc. Lamp containing pulse width modulated voltage conversion circuit
US20060284492A1 (en) * 2005-06-15 2006-12-21 Osram Sylvania Inc. Lamp that sets desired rms load voltage with variable pulse width modulation
US20060284494A1 (en) * 2005-06-15 2006-12-21 Osram Sylvania Inc. Method of setting desired rms load voltage in a lamp
US7301291B1 (en) 2006-10-02 2007-11-27 Osram Sylvania Inc. Power controller having current limited RMS regulated output
WO2008039292A2 (en) 2006-09-25 2008-04-03 Osram Sylvania Inc. Method of operating a lamp having a power supply with rms voltage regulated output
US7358689B1 (en) 2006-09-25 2008-04-15 Osram Sylvania Inc. Phase-control power controller for converting a line voltage to a RMS load voltage
US20080088246A1 (en) * 2006-10-02 2008-04-17 Osram Sylvania Inc. Lamp containing power controller having current limited RMS regulated output
US20080106213A1 (en) * 2006-10-02 2008-05-08 Osram Sylvania Inc. Method of operating a lamp with a power controller having current limited RMS regulated output
US20080122378A1 (en) * 2006-09-25 2008-05-29 Osram Sylvania Inc. Lamp having a power supply with RMS voltage regulated output

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US2896125A (en) * 1957-05-27 1959-07-21 California Comp Products Inc Electric lamp switching mechanism
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US3138737A (en) * 1961-01-30 1964-06-23 Gerald H French Switching means for a load circuit with an auxiliary time delay cutout circuit

Cited By (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461973A (en) * 1982-03-19 1984-07-24 Duro-Test Corporation Energy-efficient incandescent lamp with improved filament characteristics
WO1985004546A1 (en) * 1982-03-19 1985-10-10 Duro-Test Corporation Energy efficient incandescent lamp with improved filament characteristics
WO1984000080A1 (en) * 1982-06-14 1984-01-05 Diolight Techn Inc Extended life incandescent lamp with self-contained diode and reflector
US4480212A (en) * 1982-06-14 1984-10-30 Diolight Technology, Inc. Extended life incandescent lamp with self contained diode and reflector
US4591752A (en) * 1983-10-14 1986-05-27 Duro-Test Corporation Incandescent lamp with high pressure rare gas filled tungsten-halogen element and transparent thick walled safety envelope
US4629943A (en) * 1984-06-01 1986-12-16 Ponce Jr Emiliano Long life traffic control lamp and socket insert
WO1988004516A1 (en) * 1984-06-01 1988-06-16 Ponce Emiliano Jr Long life traffic control lamp and socket insert
DE3441065A1 (en) * 1984-11-09 1986-05-15 Matthias Dipl.-Ing. 8069 Wolnzach Boeck Small signalling incandescent lamp for operation on an AC voltage of 220 V
US4893063A (en) * 1987-10-06 1990-01-09 Joseph Pernyeszi Apparatus for improving the efficiency of a lighting element
US4897578A (en) * 1988-05-09 1990-01-30 Goad Sr Christopher F High efficiency incandescent lamp with diode rectifier
US4922155A (en) * 1988-06-22 1990-05-01 Gte Products Corporation Protective circuit for reduced voltage lamps
US5889369A (en) * 1995-08-08 1999-03-30 Roy; Gilles Incandescent lamp having a lifetime extended by two rectifying diodes and a resistor
US7839095B2 (en) 2004-10-16 2010-11-23 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit containing a voltage controlled resistor
US7612504B2 (en) 2004-10-16 2009-11-03 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit for reducing RMS load voltage
US7262554B2 (en) 2004-10-16 2007-08-28 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with hysteresis control for reducing RMS load voltage
US20060082320A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit containing a voltage controlled resistor
US7126287B2 (en) 2004-10-16 2006-10-24 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with fuse-resistor network for reducing RMS load voltage
US20060082327A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with hysteresis control for reducing RMS load voltage
US20060082326A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit for reducing RMS load voltage
US20060082328A1 (en) * 2004-10-16 2006-04-20 Osram Sylvania Inc. Lamp with integral voltage converter having phase-controlled dimming circuit with fuse-resistor network for reducing RMS load voltage
US7224151B2 (en) 2005-02-04 2007-05-29 Osram Sylvania Inc. Fixed phase power controller with analog trigger
US7274148B2 (en) 2005-02-04 2007-09-25 Osram Sylvania Inc. Lamp having fixed forward phase switching power supply with time-based triggering
US20050122086A1 (en) * 2005-02-04 2005-06-09 Osram Sylvania Inc. Fixed phase power controller with analog trigger
US20050146293A1 (en) * 2005-02-04 2005-07-07 Osram Sylvania Inc. Phase-control power controller for converting a line voltage to an RMS load voltage
US20050146292A1 (en) * 2005-02-04 2005-07-07 Osram Sylvania Inc. Lamp including phase-control power controller with digital RMS load voltage regulation
US20050110438A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Fixed forward phase switching power supply with time-based triggering
US20050110435A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Phase-control power controller with digital RMS load voltage regulation
US7352134B2 (en) 2005-02-04 2008-04-01 Osram Sylvania Inc. Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control
US7291984B2 (en) 2005-02-04 2007-11-06 Osram Sylvania Inc. Method of reducing RMS load voltage in a lamp using pulse width modulation
US20050122055A1 (en) * 2005-02-04 2005-06-09 Osram Sylvania Inc. Lamp having fixed phase power controller with analog trigger
US7274149B2 (en) 2005-02-04 2007-09-25 Osram Sylvania Inc. Lamp with integral pulse width modulated voltage control circuit
US20050110439A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Method of operating a lamp containing a fixed forward phase switching power supply
US20050184683A1 (en) * 2005-02-04 2005-08-25 Osram Sylvania Inc. Method of converting line voltage to an RMS load voltage in a lamp using a phase-control clipping circuit
US7030567B2 (en) 2005-02-04 2006-04-18 Osram Sylvania Inc. Phase-control power controller with digital RMS load voltage regulation
US20050110437A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Lamp containing phase-control power controller with analog RMS load voltage regulation
US20050110433A1 (en) * 2005-02-04 2005-05-26 Osram Sylvania Inc. Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control
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