EP0472265A2 - Methode und Einrichtung zur Beleuchtungsregelung von Gasentladungslampen, insbesondere Leuchtstofflampen - Google Patents

Methode und Einrichtung zur Beleuchtungsregelung von Gasentladungslampen, insbesondere Leuchtstofflampen Download PDF

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Publication number
EP0472265A2
EP0472265A2 EP91304850A EP91304850A EP0472265A2 EP 0472265 A2 EP0472265 A2 EP 0472265A2 EP 91304850 A EP91304850 A EP 91304850A EP 91304850 A EP91304850 A EP 91304850A EP 0472265 A2 EP0472265 A2 EP 0472265A2
Authority
EP
European Patent Office
Prior art keywords
alternating
voltage
gas
lamp
discharge lamp
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Withdrawn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
EP91304850A
Other languages
English (en)
French (fr)
Other versions
EP0472265A3 (en
Inventor
Ismo PYÖRRE
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.)
Teknoware Oy
Original Assignee
Teknoware Oy
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 Teknoware Oy filed Critical Teknoware Oy
Publication of EP0472265A2 publication Critical patent/EP0472265A2/de
Publication of EP0472265A3 publication Critical patent/EP0472265A3/en
Withdrawn legal-status Critical Current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
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

Definitions

  • the invention relates to a method of and a device for regulating the luminosity of a gas-discharge lamp, especially a fluorescent lamp.
  • the gas-discharge lamp is supplied with alternating voltage to be obtained from an alternating-voltage source
  • the device according to the invention comprises an alternating-voltage source for supplying the gas-discharge lamp with alternating voltage.
  • Electronic regulating circuits for the regulation of the luminosity of a fluorescent lamp are known per se. Three groups can be separated from the regulating devices on the market: regulators utilizing conventional control engineering, electronic coupling devices to be regulated by means of a phase angle regulator and electronic coupling devices to be regulated by means of low voltage control.
  • a drawback of the known regulating circuits is in the first place that the lamp cannot be dimmed to a very low luminosity.
  • the regulation can be carried out to a brightness level of typically about 5 %, but when regulated in the other direction the lamp cannot be made to light up until on a brightness level of about 20 to 30 %.
  • the range of regulation and ignition of a fluorescent lamp has been made wider by using high voltage peaks (of typically about 1,5 kV) on low light levels and by glowing electrodes with constant voltage. In this manner, the lighting current of the fluorescent lamp can be regulated from 100 % to nearly 0 %, but drawbacks of the solution are the high voltage causing safety problems and strong disturbances caused by the voltage peaks. Additionally, high rates of change of the current wear the electrodes of the lamp.
  • the object of the present invention is thus to get rid of the drawbacks described above and to provide a method and a device, by means of which the luminosity of the gas-discharge lamp can be regulated in both directions within very large limits without safety risks caused by high voltages or without disturbances caused by high rates of change of the current or without the electrodes wearing.
  • both electrodes of the gas-discharge lamp are supplied from respective alternating-voltage source in such a way that the voltage level of both ends of the lamp is sufficient to cause a glow discharge at the end of the lamp, and that alternating-current signals to be supplied are synchronized with each other and the synchronization between them is regulated for the regulation of the current flowing through the gas-discharge lamp.
  • the device of the invention is characterized in what is set forth in the characterizing portion of claim 4.
  • the basic idea according to the invention is to connect to both ends of a gas-discharge lamp an alternating voltage, the voltage level of which is sufficient to cause a glow discharge at the ends of the lamp, and to synchronize these signals with each other in such a way that an offset voltage effective over the lamp and thus also the current flowing through the lamp can be regulated for the regulation of the luminosity of the lamp.
  • a device with a simple construction by means of which the luminosity of the gas-discharge lamp can be regulated from a very low level of typically about 1 %, up to full luminosity.
  • the voltage of the ends of the gas-discharge lamp is even at its maximum 400 to 500 V, i.e. considerably lower than that of the devices described above based on the use of ignition peaks. Because no made-up ignition peaks are needed in the method of the invention, disturbances caused by the device remain slight also.
  • a regulating device shown in Figure 1 and functioning on a principle according to the invention is connected to an alternating-voltage source 1, which can be e.g. a conventional network of 110 or 220 V and 60 or 50 Hz.
  • the device comprises in a manner known per se a full impulse wave bridge rectifier consisting of diodes D1 to D4 and a filter capacitor C, by means of which the alternating voltage of the voltage source 1 is rectified and filtered to achieve a direct voltage at a terminal P connected to switching elements S1 and S2 similar to each other.
  • the switching element S1 comprises two push-pull connected transistors T1 and T2 and the switching element S2 two push-pull connected transistors T3 and T4, respectively.
  • the output of the switching element S1 is connected in a manner known per se to an electrode 2a of a fluorescent lamp 2 through an oscillating circuit formed by a choke L1 and a capacitor C1.
  • the object of the LC oscillator is to work a rectangular wave coming from the switch S1 to a sinoidal one, and thus, it is of no significance to the actual inventive idea.
  • the output of the switching element S2 is connected to an opposite electrode 2b of the fluorescent lamp through an oscillating circuit formed by a choke L2 and a capacitor C2.
  • the electrodes 2a and 2b collect glow voltage from taps T of the chokes L1 and L2 in a manner known per se.
  • the switching elements S1 and S2 are controlled by a phase regulating circuit 3 with two outputs indicated by reference numerals Q1 and Q2.
  • the output Q1 is connected to the bases of the transistors T1 and T2 of the switching element S1 and the output Q2 to the bases of the transistors T3 and T4 of the switching element S2, respectively.
  • the switches S1 and S2 are controlled by the output signals of the phase regulating circuit 3, and then the direct voltage at the collectors (point P) of the transistors T1 and T3, rectified and filtered from the supply voltage, is connected at a rate defined by them to the chokes L1 and L2.
  • the signals to be supplied to the electrodes 2a and 2b are indicated by reference numerals U1 and U2.
  • phase regulating circuit 3 output signals of the phase regulating circuit 3 are shown in such a way that signals V1 and V2 at the outputs Q1 and Q2 in Figures 2a and 2b are cophasal with each other, while they in Figures 2a and 2c are reversed-phasal with respect to each other.
  • the phase difference between the signals V1 and V2 can be regulated steplessly between 0° and 180°.
  • FIG 3 shows one way of realizing the phase regulation in the circuit according to Figure 1.
  • the essential point of the phase regulating circuit is a pulse width modulator 10, which can e.g. be of the commercial type SG 3524.
  • the pulse width modulator 10 gives pulses with adjustable width from two separate outputs Q3 and Q4 alternately, which pulses are distributed by means of dividers 11 connected to the outputs of the pulse width modulator, thus providing symmetric square waves at the outputs of the dividers, the phase between these waves being adjustable by controlling the pulse width modulator.
  • the outputs of the dividers 11 are connected to the switches S1 and S2 through switches S3 and S4 corresponding to the switches S1 and S2 and through capacitors C3 and C4 as well as through transformer couplings M.
  • the switches S3 and S4 connect the logic voltage level UC at the collectors of transistors T5 and T7 at a rate defined by the output signals of the dividers 11 to the switches S1 and S2 through the transformer couplings M.
  • a galvanic separation by means of the transformer couplings has been arranged in order to protect the electronic parts from the voltage of the collectors (point P, Figure 1) of the transistors T1 and T3.
  • the tube ends can collect glow current in a known manner by means of an additional coil from the chokes L1 and L2 or from the resonance current, in which way it is possible to make the regulator function at a lower operating voltage.
  • this arrangement it is possible to effect a preglowing of about 500 to 1000 ms at the ignition phase of the fluorescent tube, before the fluorescent tube is allowed to light up. Because the current flowing through the fluorescent lamp is directly proportional to the phase angle, it is easy to connect separate regulators to each other for instance by means of an optical cable or another similar method, if a phase transfer is carried out by a divider or another accurate manner. Then it is for one thing possible to accomplish individual lighting for each working point in office e.g.
  • a data receiver 20 is connected to the phase regulating circuit 3 of each regulator according to Figure 1, which receiver receives the control data coming from a bus 21.
  • Data can also be transferred in the distribution network or by infrared remote control, for example.
  • phase regulating circuit for example, can also vary in many ways according to solutions known per se in the field.

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP19910304850 1990-08-20 1991-05-29 A method of and a device for regulating the luminosity of a gas-discharge lamp, especially a fluorescent lamp Withdrawn EP0472265A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI904110A FI85320C (fi) 1990-08-20 1990-08-20 Foerfarande och anordning foer justering av ljuseffekten hos en gasurladdningslampa, speciellt en gloedlampa.
FI904110 1990-08-20

Publications (2)

Publication Number Publication Date
EP0472265A2 true EP0472265A2 (de) 1992-02-26
EP0472265A3 EP0472265A3 (en) 1992-05-27

Family

ID=8530951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910304850 Withdrawn EP0472265A3 (en) 1990-08-20 1991-05-29 A method of and a device for regulating the luminosity of a gas-discharge lamp, especially a fluorescent lamp

Country Status (2)

Country Link
EP (1) EP0472265A3 (de)
FI (1) FI85320C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332059A1 (de) * 1992-09-22 1994-03-24 Matsushita Electric Works Ltd Lichtsteuervorrichtung für eine Entladungslampe
GB2325099A (en) * 1997-05-07 1998-11-11 David John Aarons Gas discharge lamp drive circuit; dimming
WO2001099477A1 (en) * 2000-06-20 2001-12-27 Koninklijke Philips Electronics N.V. Circuit device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388563A (en) * 1981-05-26 1983-06-14 Commodore Electronics, Ltd. Solid-state fluorescent lamp ballast
US4412156A (en) * 1980-09-03 1983-10-25 Elmo Company, Limited Power supply for an ac discharge lamp
GB2162664A (en) * 1984-07-30 1986-02-05 Westinghouse Brake & Signal Power control circuit
US4719558A (en) * 1986-10-24 1988-01-12 Kyoei Densoku Co., Ltd High-frequency power supply output control device
US4884186A (en) * 1987-12-10 1989-11-28 Boschert Incorporated Power supply with reduced switching losses
US4904903A (en) * 1988-04-05 1990-02-27 Innovative Controls, Inc. Ballast for high intensity discharge lamps
US4920299A (en) * 1988-04-27 1990-04-24 General Electric Company Push-pull fluorescent dimming circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412156A (en) * 1980-09-03 1983-10-25 Elmo Company, Limited Power supply for an ac discharge lamp
US4388563A (en) * 1981-05-26 1983-06-14 Commodore Electronics, Ltd. Solid-state fluorescent lamp ballast
GB2162664A (en) * 1984-07-30 1986-02-05 Westinghouse Brake & Signal Power control circuit
US4719558A (en) * 1986-10-24 1988-01-12 Kyoei Densoku Co., Ltd High-frequency power supply output control device
US4884186A (en) * 1987-12-10 1989-11-28 Boschert Incorporated Power supply with reduced switching losses
US4904903A (en) * 1988-04-05 1990-02-27 Innovative Controls, Inc. Ballast for high intensity discharge lamps
US4920299A (en) * 1988-04-27 1990-04-24 General Electric Company Push-pull fluorescent dimming circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332059A1 (de) * 1992-09-22 1994-03-24 Matsushita Electric Works Ltd Lichtsteuervorrichtung für eine Entladungslampe
DE4332059B4 (de) * 1992-09-22 2004-08-05 Matsushita Electric Works, Ltd., Kadoma Vorschaltgerät zur Helligkeitssteuerung von Entladungslampen
GB2325099A (en) * 1997-05-07 1998-11-11 David John Aarons Gas discharge lamp drive circuit; dimming
US6815906B1 (en) 1997-05-07 2004-11-09 David John Aarons Gas discharge lamp drive circuitry
WO2001099477A1 (en) * 2000-06-20 2001-12-27 Koninklijke Philips Electronics N.V. Circuit device

Also Published As

Publication number Publication date
FI904110A0 (fi) 1990-08-20
FI85320B (fi) 1991-12-13
FI904110A (fi) 1991-12-13
EP0472265A3 (en) 1992-05-27
FI85320C (fi) 1992-03-25

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