GB2252687A - Fluorescent lamp stabilizer circuit - Google Patents

Fluorescent lamp stabilizer circuit Download PDF

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Publication number
GB2252687A
GB2252687A GB9102861A GB9102861A GB2252687A GB 2252687 A GB2252687 A GB 2252687A GB 9102861 A GB9102861 A GB 9102861A GB 9102861 A GB9102861 A GB 9102861A GB 2252687 A GB2252687 A GB 2252687A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
fluorescent lamp
circuit
transistor
switched
voltage
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.)
Withdrawn
Application number
GB9102861A
Other versions
GB9102861D0 (en )
Inventor
Ho Teng-Tien
Tao Shih-Li
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.)
SHIH LI TAO
TENG TIEN HO
Original Assignee
SHIH LI TAO
TENG TIEN HO
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

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/16Circuit 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
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/16Circuit 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
    • H05B41/20Circuit 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
    • H05B41/23Circuit 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
    • H05B41/232Circuit 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

Abstract

A fluorescent lamp stabilizer circuit comprises two transistor switches (GB1, GB2) which are switched on alternately and each of which controls a respective one of two charging circuits to provide power for energizing a fluorescent lamp tube R. Each of the charging circuits is connected by way of power terminals 1, 2 to a source of ac power, and the voltage applied to the lamp R is double that of the power supply. A resonance circuit L, C2, R is provided to generate damped oscillation. Once the lamp has started, inductor L drops the applied voltage to the rated voltage of the lamp. The circuit eliminates flashing when the lamp is turned on, and may be used to operate a lamp that had burnt out filaments. <IMAGE>

Description

2 - '1-7 FLUORESCENT LAMP STABILIZER CIRCUIT DEVICE is

BACKGROUND OF THE INVENTION:

The present invention relates to fluorescent lamp stabilizer circuit devices, and more particularly relates to a fluorescent lamp stabilizer circuit device which permits an unserviceable fluorescent lamp tube to keep serving and can eliminate flashing problem while turning on a fluorescent lamp.

In a fluorescent lamp device, a stabilizer is used with a starter to heat the tungsten filaments at the two opposite ends of a fluorescent lamp tube permitting the mercury vapor in the tube to be acted by a stream of electrons from the cathode thereof so that the fluorescent substance coated on the inside of the tube gives light. In this structure, the starter may trip off easily after having been used for a certain period of time, to cause the tungsten filaments at the two opposite ends of a fluorescent lamp tube to be constantly in a heated or extinguished status to damage the fluorescent substance coating. Under this condition, the starter and the fluorescent lamp tube 1 must replaced. Further, flashing problem may happen frequently when turning on a fluorescent lamp.

is SUMMARY OF THE INVENTION:

The present invention has been accomplished under the circumstances in view. It is an object of the present invention to provide a fluorescent lamp stabilizer circuit device which can instantaneously turn on a fluorescent lamp tube without causing any flashing problem.

It is another object of the present invention to provide a fluorescent lamp stabilizer circuit device which eliminates the use of a starter and permits a fluorescent lamp tube to keep working when its tungsten filaments are burn out or damaged.

comprises To achieve the above objects, afluorescent lamp stabilizer circuit device of the present invention two transistor switches which are alternatively switched onloff so as to control two charging circuits to provide an impulse voltage double that of power supply voltage for charging a fluorescent lamp tube to give off light. A resonance circuit is provided to generate damped oscillation so as to drop 2 output voltage to the fluorescent lamp tube to a rated range immediately after the fluorescent lamp tube is turned on.

is BRIEF DESCRIPTION OF THE DRAWING:

The present invention will now be described by way of example with reference to the annexed drawing of Fig. 1, which is a circuit diagram of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT:

Referring to Fig. 1, a fluorescent lamp stabilizer circuit device of the present inventionis generally comprised of transistors GB1, GB2, capacitors Cl, C2, Resistors RB1, RB2, inducer L and fluorescent lamp tube R. The whole circuit comprises total five terminals, in which terminals 1 and 2 are for AC power input. The positive end of capacitor Cl is connected to terminal 1. Resistor RB1 is connected between terminal 1 and the base of transistor GB1. The emitter of transistor GB2, the positive end of capacitor C2, one end of inducer L and the positive end of resistor RB2 are respectively connected to terminal 2. The 3 opposite end of resistor RB2 is connected to the base of transistor GB2. The of transistor GB1, the negative end of capacitor C2 and the opposite end of fluorescent lamp tube R are respectively connected to terminal 4. The whole circuit structure of the fluorescent lamp stabilizer circuit device forms two charging circuits and a resonance circuit and the operation of which is outlined hereinafter. When AC power is connected between terminals 1 and 2 and if terminal 1 is positive and terminal 2 is negative, transistor GB1 is turned on immediately and transistor GB2 is cut off, i.e. transistors GB1 and GB2 compensate each other. Therefore, terminals 1, 3 and 2 form a charging circuit to charge capacitor Cl to the voltage range V12 at If terminal 2 is positive and terminal 1 is negative, transistor GB1 is cut off and transistor GB2 is turned on when AC power is connected thereto, and terminals 2, 4 and 3 form a circuit permitting the voltage at capacitor Cl and the voltage V12 from power source to be added together for charging capacitor C2. Therefore a transient voltage, the value of which is double over the voltage from power source, can be obtained at terminals 2 and 4, which transient voltage is an-impulse voltage discharged to inducer L terminals 1 and 2 4 and fluorescent lamp tube R so as to instantly turn on fluorescent lamp R. At the same time, a discharge current is sent through inducer L to cause inducer L to produce an impedance which restrains the current.

capacitor C2, inducer L and fluorescent lamp are connected in parallel to form a resonance circuit, capacitor C2 produces damped oscillation while discharging, and therefore flashing problem is eliminated when fluorescent lamp tube is charged to produce light. Because tungsten filament is eliminated from the present invention and a fluorescent lamp tube is started by transient impulse voltage before normal voltage is supplied, a waste fluorescent lamp tube can still be re-used even if the tungsten filament of which is burned out or damaged.

Because tube R

Claims (6)

1. A fluorescent lamp supply circuit comprising power supply terminals, and first and second charging circuits each connectible to said power supply terminals by way of respective first and second switch means, wherein said first and second switch means are arranged to be switched on and off alternatively, and wherein each of said first and second charging circuits is coupled to supply power to a fluorescent lamp.
2. A fluorescent lamp supply circuit as claimed in Claim 1, wherein each of said first and second charging circuits is coupled to the fluorescent lamp by way of a resonance circuit.
3. A fluorescent lamp supply circuit as claimed in Claim 1 or 2, wherein each of said first and second switch means comprises at least one transistor.
4. A fluorescent lamp supply circuit as claimed in any preceding claim, wherein each of said first and second charging circuits comprises at least one capacitor.
5. A fluorescent lamp stabilizer circuit device, comprised of two transistors, two capacitors, two resistors, an inducer and a fluorescent lamp tube, said transistors being alternatively switched on/off, characterised in that a first charging circuit is formed, when the first transistor is switched on and the second transistor is switched off, to charge the first capacitor to the voltagerange of power supply; a second charging circuit is formed, when the first transistor is switched off and the second transistor is switched on, to charge the second transistor to the range of power supply voltage plus the terminal voltage at the first capacitor so as to provide an impulse terminal voltage at the second capacitor double that of power supply voltage permitting said impulse terminal voltage to instantaneously turn on said fluorescent lamp tube via said inducer; said capacitors, inducer and fluorescent lamp tube form a resonance circuit to provide damped oscillation so as to eliminate flashing when said fluorescent lamp tube is turned on; and said inducer restrains the current through said fluorescent lamp tube so as to drop the voltage at said fluorescent lamp tube to a rated voltage range once said fluorescent lamp tube is turned on.
6. A fluorescent lamp supply circuit substantially as hereinbefore described with reference to the accompanying drawing.
GB9102861A 1991-02-11 1991-02-11 Fluorescent lamp stabilizer circuit Withdrawn GB2252687A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9102861A GB2252687A (en) 1991-02-11 1991-02-11 Fluorescent lamp stabilizer circuit

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9102861A GB2252687A (en) 1991-02-11 1991-02-11 Fluorescent lamp stabilizer circuit
CA 2036168 CA2036168A1 (en) 1991-02-11 1991-02-12 Fluorescent lamp stabilizer circuit device
CH67591A CH681587A5 (en) 1991-02-11 1991-03-05
NL9101970A NL9101970A (en) 1991-02-11 1991-11-25 Stabilization circuit for fluorescent tubes.

Publications (2)

Publication Number Publication Date
GB9102861D0 true GB9102861D0 (en) 1991-03-27
GB2252687A true true GB2252687A (en) 1992-08-12

Family

ID=10689845

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9102861A Withdrawn GB2252687A (en) 1991-02-11 1991-02-11 Fluorescent lamp stabilizer circuit

Country Status (3)

Country Link
CA (1) CA2036168A1 (en)
GB (1) GB2252687A (en)
NL (1) NL9101970A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279514A (en) * 1993-06-24 1995-01-04 Strand Lighting Ltd Power control converter circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676735A (en) * 1969-09-25 1972-07-11 Sylvania Electric Prod Resonator ballast for arc discharge lamps
GB1471104A (en) * 1974-09-18 1977-04-21 Philips Electronic Associated Discharge lamp arrangement
GB2104319A (en) * 1981-08-25 1983-03-02 Home Electric Company Limited Fluorescent lamp starter apparatus
US4687971A (en) * 1984-11-08 1987-08-18 Fuji Xerox Company, Limited Power supply for discharge lamp
EP0233605A2 (en) * 1986-02-18 1987-08-26 Kenneth Theodore Zeiler Frequency modulation ballast circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676735A (en) * 1969-09-25 1972-07-11 Sylvania Electric Prod Resonator ballast for arc discharge lamps
GB1471104A (en) * 1974-09-18 1977-04-21 Philips Electronic Associated Discharge lamp arrangement
GB2104319A (en) * 1981-08-25 1983-03-02 Home Electric Company Limited Fluorescent lamp starter apparatus
US4687971A (en) * 1984-11-08 1987-08-18 Fuji Xerox Company, Limited Power supply for discharge lamp
EP0233605A2 (en) * 1986-02-18 1987-08-26 Kenneth Theodore Zeiler Frequency modulation ballast circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279514A (en) * 1993-06-24 1995-01-04 Strand Lighting Ltd Power control converter circuit

Also Published As

Publication number Publication date Type
GB9102861D0 (en) 1991-03-27 application
NL9101970A (en) 1993-06-16 application
CA2036168A1 (en) 1992-08-13 application

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)