US3781597A - Lighting device for a discharge lamp - Google Patents

Lighting device for a discharge lamp Download PDF

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Publication number
US3781597A
US3781597A US00310131A US3781597DA US3781597A US 3781597 A US3781597 A US 3781597A US 00310131 A US00310131 A US 00310131A US 3781597D A US3781597D A US 3781597DA US 3781597 A US3781597 A US 3781597A
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United States
Prior art keywords
discharge lamp
voltage
ballast
power source
ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00310131A
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English (en)
Inventor
O Nomura
K Yajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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Publication of US3781597A publication Critical patent/US3781597A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps

Definitions

  • FIG. 2 1 Claim, 5 Drawing Figures PATENTED DEEZS I975 FIG. 2
  • FIG. 1 A first figure.
  • FIG. 4A is a diagrammatic representation of FIG. 4A
  • the present invention relates to a lighting device for a discharge lamp and particularly to a lighting device in which a ballast has the optimum requirement for being light in weight and compact.
  • a lighting device for a discharge lamp must have the functions of easily starting a discharge lamp, stably maintaining the lighting of the discharge lamp and holding down the output variation of the discharge lamp even if a power source voltage is varied. For this reason a ballast'is so constructed that in order to light a discharge lamp the ratio V,/V of the unloaded voltage V of a power source to the nominal lamp voltage V, is a relatively small value of 0.450.5.
  • the object of the present invention is to provide a lighting device for a discharge lamp including a ballast capable of being maintained at optimum condition without involving any flickering or fading out and having the optimum requirement of being lit in weight and compact.
  • the lighting device including a discharge lamp is operated by an AC power source and a ballast is inserted between the AC power source and the discharge lamp.
  • the ratio Z /Z of the capacitive impedance 2,; to the inductive impedance 2, of the ballast is in the range of 1.9-2.8;
  • the ratio V /V of the nominal lamp voltage V of the discharge lamp and the unloaded voltage V of the power source is in the range of 0.7-1.1; and when the ratio is in the range of 1.0-1.1, Z Z, V and V are defined to satisfy the following equation:
  • FIG. 1 is a schematic diagram showing one embodiment according to the present invention.
  • FIG. 2 is a schematicdiagram showing another embodiment according to the present invention.
  • FIG. 3 is an explanatory diagram of the characteristics of the device according to the present invention.
  • a discharge lamp 2 is connected, through a ballast 3, between the terminals of an AC voltage source I.
  • the ballast consists of an inductive impedance element, for example, a choke coil 4 and a capacitive impedance element, for example, a condenser 15.
  • the inductive impedance and capacitive impedance are denoted as 2, and Z respectively, and the unloaded voltage of the power source 1 and the nominal lamp voltage of the discharge lamp are denoted as V and V respectively.
  • a pulse generating circuit 6 driven by the voltage of the power source. An output pulse from the pulse generating circuit is fed to a tap 7 of the choke coil 4.
  • an output pulse from the pulse generating circuit 6 is applied to the tap 7.
  • the voltage of the output pulse is boosted by the choke coil 4 and a hightension pulse is generated across the choke coil.
  • the high-tension pulse is applied, in a manner to be overlapped by an AC voltage from the power source, between the electrodes of a discharge lamp 2 to light the discharge lamp.
  • the inductive impedance Z and capacitive impedance Z of the ballast become greater. In this case, a ballast will be largesized and it is therefore undesirable. To explain in more detail, in those areas the inductive impedance Z of the ballast becomes greater than that of a phase lagging type ballast having inductive impedance only and, in addition, a lamp voltage varied with a power source presents no difference from the case in which a phaselagging type ballast is used.
  • the ratio of the nominal voltage V, to the unloaded voltage of the power source is expressed below.
  • this lighting device falls on a point 0 within the area as defined in FIG. 3 and exhibits an excellent lighting state.
  • a lighting device capable of maintaining an excellent lighting state and having a small-sized, light weight ballast is obtained by restricting the relation of Z /Z to V /V specifically to the area as defined by lines a, b, c and d.
  • FIG. 2 there is shown another embodiment according to the present invention in which a leakage transformer 8 is used as an inductive impedance element of a ballast 3.
  • the above-mentioned voltage V means a voltage applied between the electrodes of a discharge lamp before the starting of the discharge lamp.
  • the operational function is substantially the same as the embodiment of FIG. 1 and any further explanation is therefore omitted.
  • a lighting device for a discharge lamp including a discharge lamp fed from an AC power source and a ballast arranged between the discharge lamp and the AC power source and including a capacitive impedance Z and an inductive impedance Z,,, in which a ratio Z /Z of the capacitive impedance Z to the inductive impedance is in the range of 1.9-2.8; a ratio V /V of a nominal lamp voltage V of the discharge lamp to an unloaded voltage V of the power source is in the range of 0.7-1.1; and when the ratio V /V is in the range of 1.0-1.1 it satisfies the equation:

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  • Circuit Arrangements For Discharge Lamps (AREA)
US00310131A 1972-08-25 1972-11-28 Lighting device for a discharge lamp Expired - Lifetime US3781597A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8503072A JPS555674B2 (ja) 1972-08-25 1972-08-25

Publications (1)

Publication Number Publication Date
US3781597A true US3781597A (en) 1973-12-25

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ID=13847298

Family Applications (1)

Application Number Title Priority Date Filing Date
US00310131A Expired - Lifetime US3781597A (en) 1972-08-25 1972-11-28 Lighting device for a discharge lamp

Country Status (2)

Country Link
US (1) US3781597A (ja)
JP (1) JPS555674B2 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2262898A1 (ja) * 1974-03-01 1975-09-26 Philips Nv
US3983449A (en) * 1974-12-11 1976-09-28 Thorn Electrical Industries Limited Discharge lamp ballast circuits
US4642526A (en) * 1984-09-14 1987-02-10 Angstrom Robotics & Technologies, Inc. Fluorescent object recognition system having self-modulated light source

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57143298A (en) * 1981-03-02 1982-09-04 Mitsubishi Electric Corp Device for firing discharge lamp
JPS58117684A (ja) * 1981-12-29 1983-07-13 松下電工株式会社 放電灯点灯回路

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2262898A1 (ja) * 1974-03-01 1975-09-26 Philips Nv
US3983449A (en) * 1974-12-11 1976-09-28 Thorn Electrical Industries Limited Discharge lamp ballast circuits
US4642526A (en) * 1984-09-14 1987-02-10 Angstrom Robotics & Technologies, Inc. Fluorescent object recognition system having self-modulated light source

Also Published As

Publication number Publication date
JPS4939980A (ja) 1974-04-15
JPS555674B2 (ja) 1980-02-08

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