US3851209A - Discharge lamp starting apparatus - Google Patents

Discharge lamp starting apparatus Download PDF

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Publication number
US3851209A
US3851209A US00330098A US33009873A US3851209A US 3851209 A US3851209 A US 3851209A US 00330098 A US00330098 A US 00330098A US 33009873 A US33009873 A US 33009873A US 3851209 A US3851209 A US 3851209A
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US
United States
Prior art keywords
capacitor
thyristor
discharge lamp
lamp
resistor
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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
US00330098A
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English (en)
Inventor
T Murakami
Y Niguchi
K Nishimura
Y Shimizu
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.)
Shindengen Electric Manufacturing Co Ltd
Panasonic Electric Works Co Ltd
Original Assignee
Shindengen Electric Manufacturing Co Ltd
Matsushita Electric Works 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.)
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Application filed by Shindengen Electric Manufacturing Co Ltd, Matsushita Electric Works Ltd filed Critical Shindengen Electric Manufacturing Co Ltd
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H05B41/044—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/02—High frequency starting operation for fluorescent lamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • a discharge lamp starting apparatus comprising a hot cathode start fluorescent discharge lamp having a cathode at each end thereof, a pulse generating circuit consisting of a pulse transformer connected to one of t the cathodes of the discharge lamp and having a primary winding and a secondary winding, a first capacitor, a first bi-directional diode thyristor and a resistor, a circuit portion for increasing preheating current to the cathodes including a diode and a second capacitor which are connected in parallel with a circuit of the first bi-directional diode thyristor and the resistor, and a second bi-directional diode thyristor adapted to be turned off upon operation of the discharge tube and connected between the diode, the resistor and the second capacitor, on one hand, and the other cathode of 4 Claims, 10 Drawing Figures I DISCHARGE LAMP STARTING APPARATUS Primary Examiner-Herman Karl Saalbach ⁇ 75 Inventors: Tbyoharu Mur
  • the present invention relates to a starting apparatus for starting a hot cathode start fluorescent discharge lamp.
  • the discharge lamp starting apparatus of this invention makes rapid starting of a discharge lamp possible by means of a starting circuit whose principal components consist of semiconductor switching elements.
  • the discharge lamp starting apparatus of this invention comprises a pulse transformer, a first semiconductor switching element, a pulse generating capacitor, a capacitor charging resistor, a diode for increasing preheating current to a fluorescent discharge lamp when starting the discharge lamp, a second capacitor, and'a second semiconductor switching element for interrupting the supply of current to a starting circuit subsequent to the operation of the fluorescent discharge lamp.
  • FIG. 1 is a basic electrical circuit diagram of an embodiment of a discharge lamp starting apparatus according to the present invention
  • FIG. 2 is an electrical circuit diagram of another embodiment of the apparatus according to the present invention.
  • FIG. 3 is an electrical circuit diagram of a further embodiment of the invention.
  • FIG. 4 is an electrical characteristic diagram of the semiconductor switching element employed in the present invention.
  • FIG. 5 is a diagram showing the electrical characteristic of another semiconductor switching element employed in the present invention.
  • FIG. 6. is a diagram showing the voltage waveform applied during starting across the cathodes of the fluorescent discharge lamp shown in the circuit diagram of FIG. 1;
  • FIG. 7 is a diagram showing the waveform of current which flows through the point C in the circuit diagram of FIG. 1;
  • FIG. 8 is a diagram showing the voltage waveform ap plied during lamp operation across the cathodes of the fluorescent discharge lamp in the circuit diagram of FIG. 1;
  • FIG. 9 is a conventional fluorescent discharge lamp starting circuit diagram
  • FIG. 10 is a diagram showing the lamp voltage wavefonn during operation of the discharge lamp shown in FIG. 9.
  • FIG. 9 of the drawings there is illustrated one form of the previously mentioned prior art devices which has been designed giveing the greatest consideration to the starting characteristic and life of the fluorescent discharge lamp.
  • the illustrated circuit is broadly divided into a fluorescent discharge lamp 1, a power supply section I and a starting circuit section II, and cathodes 2 and 2' provided at the ends of the discharge lamp I have their one ends connected to an AC source 3 and a ballast 4 and the other ends connected to the starting circuit section II consisting of a pulse transformer 5, a bi-directional diode thyristor 6, a diode 7, capacitors 8 and 9, and a resistor 10.
  • this circuit is disadvantageous in that since the preheating of the cathodes of the fluorescent discharge lamp and the application of high pulse voltage across the cathodes of the lamp are effected by the same single switching element 6, the switching element 6 is subjected to an increased electrical stress and moreover since the preheating of the cathodes of the lamp and the application of high pulse voltage are effected simultaneously in the same phase, the cathode preheating current is limited so that the cathodes act as so-called cold starting with resultant rapid consumption of the oxide coated on the cathodes and hence a reduced life of the fluorescent discharge lamp.
  • the preheating of the cathodes and the application of high pulse voltage are effected simultaneously and in the same phase, if the external impedance (i.e., mainly the impedance of the ballast differs with different discharge lamps used, the value and phase of the high pulse voltage vary considerably under the influence of the preheating current and therefore it is difficult to ensure satisfactory starting for various fluorescent discharge lamps of different types under the same specification.
  • the external impedance i.e., mainly the impedance of the ballast differs with different discharge lamps used
  • numeral 1 designates a hot cathode start fluorescent discharge lamp having cathodes 2 and 2 at the ends thereof
  • block I designates a power supply section consisting of a commercial AC source 3 and a ballast 4.
  • Block II designates a starting circuit section according to the present invention, in which numeral 5 designates a pulse transformer having a primary winding n and a secondary winding n with the turns ratio of the winding n to the winding n being about 1:20.
  • Numeral 6 designates a first semiconductor switching element consisting of a bi-directional diode thyristor which constitutes a pulse voltage generating circuit with a first capacitor 7, the pulse transformer 5 and a resistor 8.
  • Numeral 9 designates a diode whose purpose is to permit, during starting, the flow of a preheating current subjected to half-wave rectification through the circuit so as to magnetically saturate the magnetic circuit of the ballast 4 and to thereby supply a sufficient preheating current to the cathodes 2 and 2 of the fluorescent discharge lamp 1 (hereinafter referred to as a lamp).
  • Numeral l designates a second capacitor which serves to asist the pulse voltage generating circuit composed of the components through 8 to more efficiently generate high voltage and which also serves with the diode 9 to increase the preheating current to the cathodes 2 and 2 of the lamp 1 during starting thereof.
  • the second capacitor has a larger capacity than that of the first capacitor 7.
  • Numeral ll designates a second semiconductor switching element consisting of a bi-directional diode thyristor having characteristics so that it is rendered conductive during starting of the lamp 1, while it is rendered non-conductive during operation of the lamp 1. As shown in FIG.
  • the electrical static characteristic of the bi-directional diode thyristor constituting each of the first and second switching elements is such that when the applied voltage reaches the breakover voltage V of the element, the state of the element is rapidly changed into conductive, whereas when the current through the element decreases below its holding current I the state of the element transfers to the nonconductive state.
  • the breakover voltage V of the first thyristor must be selected lower than the peak value of the power supply voltage and the breakover voltage.
  • V of the second thyristor must be selected lower than the maximum value of the power supply voltage, but higher than the peak value of the lamp voltage of the lamp 1 in operation.
  • the thyristor having the characteristic as shown in FIG. 4 is generally known as a triggering thyristor
  • the second thyristor of the two thyristors consists of one which is generally known as a power thyristor shown, for example, in FIG. 5, its operation will be the same.
  • the charging current for the pulse voltage generating first capacitor 7 during starting depends on the value, e.g., 3 to 5 K9, of the resistor 8 whose impedance is much higher than that of the ballast 4. Therefore, even if the impedance of a ballast varies in accordance with different types of lamps, the switching characteristics of the thyristors will not be affected and thus the starting apparatus according to this invention is compatible with different kinds of lamps.
  • the pulse generating circuit generates a pulse voltage of a high frequency (on the order 5 k hertz) during starting, the amount of current flow through the first thyristor 6 constituting part of the pulse generating circuit is very small due to the provision of the resistor 8. Therefore, the first thyristor 6 is subject to only a small electric stress and hence its operating reliability is increased.
  • each of the thyristors has a quiescent period corresponding to one-half cycle of the power supply voltage, so that the thyristors are subject to only a small electric stress and the thyristors can easily recover form the effect of this stress with resultant improvement in their operating reliability.
  • the preheating current amplifier circuit consisting of the parallel connection of the diode 9 and the second capacitor 10 is connected, through the primary winding n of the pulse transformer 5, in parallel with the pulse generating circuit consisting of the pulse transformer 5, the first thyristor 6 and so on, the magnetic circuit of the ballast 4 is fully saturated during starting supplying a sufficient preheating current to the cathodes 2 and 2 of the lamp 1 and thus the occurrence of so-called cold starting phenomenon is prevented, thereby ensuring a longer life of the lamp 1.
  • the capacitors are both connected to the lamp 1 through the second thyristor l1 and thus the capacitors will not be charged owing to the turning off of the thyristor 11 during the operation of the lamp 1. Consequently, there is no occurrence of a phenomenon in which, as was the case with the previously explained prior art apparatus shown in FIG. 9, the charging and discharging currents are supplied to the capacitors even during the operation of the lamp 1 thereby increasing the peak value of the lamp voltage and imposing a restriction on the lower limit to the breakover voltage V of thyristors employed.
  • the apparatus according to the present invention can be applied to various lamps having different lamp voltages.
  • the breakover voltage V of the second thyristor 11 is preselected lower than the maximum value of the power supply voltage as previously mentioned, the second thyristor II is rapidly rendered conductive at the phase of the applied waveform appearing at a time t in FIG. 6, thereby supplying a charging current to the second capacitor lltl.
  • the amount of charging current flowing through the second thyristor I1 gradually decreases and eventually at a time when the charging current becomes less than the holding current I the second thyristor I1 is changed from the conductive state to the nonconductive state.
  • the second thyristor II is negatively biased by the charging potential for the second capacitor 10 and it is thus maintained nonconductive.
  • the first capacitor 7 having a capacity smaller than that of the second capacitor 10 receives its charging current from the second capacitor 10 through the resistor 8 so that the whole potential on the second capacitor 10 is ultimately applied to the first capacitor 7 and thus the voltage applied to the first capacitor 7 is also applied to the first thyristor 6 through the primary winding n of the pulse transformer 5. Since the breakover voltage V of the first thyristor 6 is preset lower than the charging potential for the second capacitor 10, the state of the first thyristor 6 becomes rapidly conductive and thus the charge on the first capacitor 7 is discharged through the primary winding n, of the pulse transformer 5.
  • the instantaneous value of the power supply voltage has not attained the breakover voltage V of the second thyristor 11.
  • this residual charge is superimposed on the instantaneous value of the power sup ply voltage and applied to the second thyristor 11. Consequently, the second thyristor 11 is changed into conduction at the time t, where the phase of the power supply voltage is still much short of the phase of time at which the instantaneous value of the power supply voltage attains the breakover voltage V of the second thyristor III.
  • the residual charge on the second capacitor 10 is supplied as a discharge current until the phase of time t, t thereby supplying a preheating current.
  • a closed circuit consisting of the second thyristor 11, the diode 9, the secondary winding n of the pulse transformer 5, ballast 4 and the power supply 3 is established through the cathodes 2 and 2 at the ends of the lamp 1. Consequently, the cathodes 2 and 2' of the lamp 1 are preheated by the magnetic saturation of the ballast 4 due to the rectifying action of the diode 9 and the: current flow in this closed circuit continues until the current flow through the second thyristor 11 decreases below its holding current I at a phase of time it The waveform of this current is shown in FIG.
  • the circuit of FIG. 2 differs from the circuit of FIG. 1 in that a resistor 12 is connected in parallel with the second capacitor 10.
  • the resistor 12 serves as a discharging resistor. If the lamp 1 is operated without the complete discharging of the charge stored in the second capacitor 10, the voltage applied to the second thyristor Ill during the lamp operation consists of the lamp voltage of the operated lamp 1 on which has been superposed the residual charge on the second capacitor 10. Consequently, the absolute value of this applied voltage tends to become so great that it may sometimes become higher than the breakover voltage V of the second thyristor 11. In such an instance, a so-called re-ignition phenomenon" is repeated in which the once operated lamp 1 is again prelheated and then put into operation. The provision of the resistor 12 permits the complete discharging of the remaining charge on the second capacitor 10.
  • the third embodiment shown in. FIG. 3 differs from the embodiment of FIG. 1 in that the second capacitor 10 is connected to the center terminal of the pulse transformer 5. This change in the location of the second capacitor 10 gives rises to no inconvenience and thus the same operating principle and the effect as those of the embodiment shown in FIG. 1 can be expected.
  • the first capacitor 7 and the first thyristor 6 may change places without provoking any hindrance, and also the diode 9 can be connected inversely.
  • FIGS. 1 to 3 There are some differences in circuit construction among the embodiments so far described and illustrated in FIGS. 1 to 3, however, all of the embodiments operate such that a high voltage pulse is applied across the cathodes of a lamp, thereby supplying a sufficient preheating current to the respective cathodes to eventually bring the lamp into operation.
  • the lamp voltage waveform of the lamp 1 which is applied to the starting circuit after the lamp has been operated is shown in FIG. 8 at e and practically whole of this voltage is applied to the second thyristor l 1.
  • 2 represents the power supply voltage waveform.
  • the second thyristor is connected in series with the first and second capacitors with the result that the charging and discharging voltages of the capacitors have no effect on the lamp voltage waveform during the lamp operation. Consequently, the maximum value of the lamp voltage waveform is made sufficiently lower than it has been in the previously known apparatus and the lower limits of the breakover voltage of the second thyristor can be settled to be sufficient low and also it can be chosen from a wide range of voltage.
  • the lower limit to the breakover voltage of the first thyristor needs not be set higher than the lamp voltage during lamp operation as was the case in the previously known apparatus and it is possible to use a thyristor whose breakover voltage is on the order of several volts.
  • the selection of the characteristics of the thyristors to be employed can be made very easily and those thyristors which ensure satisfactorily wide applications and desired effect of mass production may be employed.
  • a starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising:
  • a pulse generating circuit including a pulse transformer having a primary winding and a secondary winding coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor and a first bi-directional diode thyristor connected in series across the ends of the primary winding of said pulse transformer, and a resistor having one end thereof connected to the junction of said first capacitor and said first thyristor;
  • a second bi-directional diode thyristor connected between the other ends of said resistor, diode and second capacitor and the other cathode of said fluorescent discharge lamp.
  • a discharge lamp starting apparatus according to claim 1 wherein said second capacitor is connected in parallel with a series circuit of said first capacitor and said resistor in said pulse generating circuit.
  • a discharge lamp starting apparatus wherein a second resistor is connected in parallel with said second capacitor connected in parallel with the series circuit of said first capacitor and resistor in said pulse generating circuit.
  • a starting apparatus for a hot cathode start fluorescent discharge lamp having a cathode at each end, said starting apparatus being connected in series with said cathodes and comprising:
  • a pulse generating circuit including a pulse transformer having a winding including primary and secondary portions coupled to one of the cathodes of said fluorescent discharge lamp, a first capacitor having one end thereof connected to the junction between the primary and secondary portions of the winding of said pulse transformer, a first bidirectional diode thyristor having one end thereof connected to the other end of said primary winding, and a resistor having one end thereof connected to the other ends of said first capacitor and first bi-directional diode thyristor;
  • a second bi-directional diode thyristor connected between the other ends of said resistor and parallel combination of said diode and said capacitor and the other cathode of said fluorescent discharge lamp.

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  • Circuit Arrangements For Discharge Lamps (AREA)
US00330098A 1972-02-07 1973-02-06 Discharge lamp starting apparatus Expired - Lifetime US3851209A (en)

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Application Number Priority Date Filing Date Title
JP1972015967U JPS518779Y2 (ko) 1972-02-07 1972-02-07

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US00330098A Expired - Lifetime US3851209A (en) 1972-02-07 1973-02-06 Discharge lamp starting apparatus

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US (1) US3851209A (ko)
JP (1) JPS518779Y2 (ko)
CA (1) CA1006570A (ko)
CH (1) CH563099A5 (ko)
DE (1) DE2305926C3 (ko)
FR (1) FR2171167B1 (ko)
GB (1) GB1411482A (ko)
IT (1) IT980410B (ko)
NL (1) NL7301629A (ko)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017761A (en) * 1974-12-05 1977-04-12 U.S. Philips Corporation Electric device for starting and supplying a gas-and/or vapor discharge lamp
US4081718A (en) * 1975-05-20 1978-03-28 Nec Sylvania Corporation Discharge lamp lighting device using a backswing booster
EP0042583A1 (de) * 1980-06-19 1981-12-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Zünd- und Betriebsschaltung für eine Niederdruckentladungslampe
US4329622A (en) * 1980-05-19 1982-05-11 Xerox Corporation Low pressure gas discharge lamp with increased end illumination
US4339690A (en) * 1980-08-01 1982-07-13 Gte Laboratories Incorporated Energy saving fluorescent lighting system
US4572988A (en) * 1983-08-22 1986-02-25 Industrial Design Associates, (Ida) High frequency ballast circuit
GB2173055A (en) * 1985-03-29 1986-10-01 Philips Electronic Associated Circuit arrangement for starting discharge lamps
US4866347A (en) * 1987-09-28 1989-09-12 Hubbell Incorporated Compact fluorescent lamp circuit
US5063328A (en) * 1986-12-17 1991-11-05 Walton John F Energy saving circuit for discharge tubes
US5479075A (en) * 1995-02-03 1995-12-26 Chen; Shih-Ta Fluorescent lamp starter circuit
US5504398A (en) * 1994-06-10 1996-04-02 Beacon Light Products, Inc. Dimming controller for a fluorescent lamp
US5537010A (en) * 1994-06-10 1996-07-16 Beacon Light Products, Inc. Voltage-comparator, solid-state, current-switch starter for fluorescent lamp
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
US5736817A (en) * 1995-09-19 1998-04-07 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
US5757145A (en) * 1994-06-10 1998-05-26 Beacon Light Products, Inc. Dimming control system and method for a fluorescent lamp
US5861720A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching power control circuit and method
US5861721A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching module
US5955847A (en) * 1994-06-10 1999-09-21 Beacon Light Products, Inc. Method for dimming a fluorescent lamp
CN102098858A (zh) * 2011-01-18 2011-06-15 武汉和隆电子有限公司 气体放电灯启动器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2602604C2 (de) * 1976-01-24 1982-04-22 New Nippon Electric Co., Ltd., Osaka Schaltungsanordnung zum Zünden und zum Betrieb einer Gasentladungslampe
NO801819L (no) * 1979-07-24 1981-01-26 Gen Electric Co Ltd Elektrisk utladningslampe-krets.
BE879019A (fr) * 1979-09-26 1980-03-26 Acec Demarreur pour lampes telles que lampes fluorescentes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644780A (en) * 1968-12-27 1972-02-22 Matsushita Electric Ind Co Ltd Starting device for discharge lamp including semiconductors preheating and starting circuits

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665243A (en) * 1969-02-27 1972-05-23 New Nippon Electric Co Discharge-lamp operating device using thyristor oscillating circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644780A (en) * 1968-12-27 1972-02-22 Matsushita Electric Ind Co Ltd Starting device for discharge lamp including semiconductors preheating and starting circuits

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017761A (en) * 1974-12-05 1977-04-12 U.S. Philips Corporation Electric device for starting and supplying a gas-and/or vapor discharge lamp
US4081718A (en) * 1975-05-20 1978-03-28 Nec Sylvania Corporation Discharge lamp lighting device using a backswing booster
US4329622A (en) * 1980-05-19 1982-05-11 Xerox Corporation Low pressure gas discharge lamp with increased end illumination
EP0042583A1 (de) * 1980-06-19 1981-12-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Zünd- und Betriebsschaltung für eine Niederdruckentladungslampe
US4339690A (en) * 1980-08-01 1982-07-13 Gte Laboratories Incorporated Energy saving fluorescent lighting system
US4572988A (en) * 1983-08-22 1986-02-25 Industrial Design Associates, (Ida) High frequency ballast circuit
GB2173055A (en) * 1985-03-29 1986-10-01 Philips Electronic Associated Circuit arrangement for starting discharge lamps
US5063328A (en) * 1986-12-17 1991-11-05 Walton John F Energy saving circuit for discharge tubes
US4866347A (en) * 1987-09-28 1989-09-12 Hubbell Incorporated Compact fluorescent lamp circuit
US5504398A (en) * 1994-06-10 1996-04-02 Beacon Light Products, Inc. Dimming controller for a fluorescent lamp
US5537010A (en) * 1994-06-10 1996-07-16 Beacon Light Products, Inc. Voltage-comparator, solid-state, current-switch starter for fluorescent lamp
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
US5757145A (en) * 1994-06-10 1998-05-26 Beacon Light Products, Inc. Dimming control system and method for a fluorescent lamp
US5955847A (en) * 1994-06-10 1999-09-21 Beacon Light Products, Inc. Method for dimming a fluorescent lamp
US5479075A (en) * 1995-02-03 1995-12-26 Chen; Shih-Ta Fluorescent lamp starter circuit
US5736817A (en) * 1995-09-19 1998-04-07 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
US5861720A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching power control circuit and method
US5861721A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching module
CN102098858A (zh) * 2011-01-18 2011-06-15 武汉和隆电子有限公司 气体放电灯启动器
CN102098858B (zh) * 2011-01-18 2013-04-24 武汉和隆电子有限公司 气体放电灯启动器

Also Published As

Publication number Publication date
IT980410B (it) 1974-09-30
DE2305926A1 (de) 1973-08-16
CH563099A5 (ko) 1975-06-13
NL7301629A (ko) 1973-08-09
DE2305926C3 (de) 1976-10-14
FR2171167A1 (ko) 1973-09-21
JPS4893680U (ko) 1973-11-09
GB1411482A (en) 1975-10-29
CA1006570A (en) 1977-03-08
JPS518779Y2 (ko) 1976-03-09
DE2305926B2 (de) 1976-01-22
FR2171167B1 (ko) 1977-04-22

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