EP0034401A2 - Circuit pour lampes à décharge - Google Patents

Circuit pour lampes à décharge Download PDF

Info

Publication number
EP0034401A2
EP0034401A2 EP81300106A EP81300106A EP0034401A2 EP 0034401 A2 EP0034401 A2 EP 0034401A2 EP 81300106 A EP81300106 A EP 81300106A EP 81300106 A EP81300106 A EP 81300106A EP 0034401 A2 EP0034401 A2 EP 0034401A2
Authority
EP
European Patent Office
Prior art keywords
circuit
starter
discharge lamp
lamps
applied 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.)
Granted
Application number
EP81300106A
Other languages
German (de)
English (en)
Other versions
EP0034401B1 (fr
EP0034401A3 (en
Inventor
John Cyril Pegg
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.)
Thorn EMI PLC
Original Assignee
Thorn EMI PLC
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 Thorn EMI PLC filed Critical Thorn EMI PLC
Priority to AT81300106T priority Critical patent/ATE9530T1/de
Publication of EP0034401A2 publication Critical patent/EP0034401A2/fr
Publication of EP0034401A3 publication Critical patent/EP0034401A3/en
Application granted granted Critical
Publication of EP0034401B1 publication Critical patent/EP0034401B1/fr
Expired 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
    • H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices

Definitions

  • This invention relates to the starting of discharge lamps.
  • the glow-switch starter is still the most common commercially available starter.
  • various different types of electronic starter circuit have evolved, as is illustrated by British Patents 1,264,397; 1,278,839; 1,342,026; 1,397,265 and 1,411,575, and our German laid-open Patent application (Offenlegungsschrift) 28 16 415.
  • a discharge lamp circuit comprising two or more discharge lamps each in series with a choke ballast across supply input terminals, a starter circuit of a type which is operative with a cyclically-varying unidirectional supply voltage, and two or more rectifier elements, each element connecting a respective one of the lamps across the common starter circuit.
  • the invention enables a single starter circuit to be used to start two or more lamps, without adverse results if one of the lamps should fail.
  • the circuit illustrated in Figure 1 has two gas discharge lamps, (fluorescent tubes), 10 and 110, each connected through a respective choke 18, 118 across A.C. mains supply input terminals 16a, 16b.
  • the tubes are of the heated cathode type and have cathodes 12, 14, 112, 114 with terminals 12a, 12b, 14a, 14b, 112a, 112b, and 114a, 114b.
  • a conventional power factor capacitor 90 is preferably connected across the supply input terminals.
  • a single starter circuit 70 having starter input terminals 22 , 24 is -used to start both tubes 10, 110.
  • the starter circuit 80 is connected across each of the tubes 10, 110 through a respective diode 150, 152, the diodes having their cathodes connected together and to the terminal 22.
  • the terminal 24 is connected to the tubes 10, 110 through respective resistors 15, 156.
  • Two capacitors 38, 138 may be connected directly across the two tubes 10, 110 respectively.
  • the illustrated starter circuit 70 is of the type shown in Figure 6 of our aforementioned German Application 28 16 415, to which reference should be made for a detailed description of its construction and operation.
  • the starter circuit comprises a thyrister 26 connected across the starter input terminals 22, 24, and a control circuit 74 for triggering the thyristor 26 into conduction once during each cyle of the applied voltage.
  • the control circuit 74 comprises a series circuit of a diode 28, a Zener diode or other avalanche diode having a zener-like characteristic 30, a capacitor 32, and a resistor 34, with the gate 36 of the thyristor connected to the junction between the capacitor 32 and the resistor 34.
  • a resistor 64 is connected across the Zener diode 30, and a capacitor 62 and resistor 72 are both connected in parallel across the Zener diode 30, capacitor 32 and resistor 34.
  • the starter circuit has the following characteristics. First, it is capable of working with a unidirectional cyclically-varying input voltage, particularly with half-cycles of rectified A.C.
  • the starter circuit 70 operates as described in our aforementioned German Application, and the thyristor trigger point progresses until one tube, say tube 10, is ready to strike. There will then be a partial discharge in this tube which will continue until, on the next half cycle, the thyristor 26 conducts and shorts out the tube 10. The thyristor is however triggered on this half cycle because the tube 110 which-is-not ready to strike maintains a high-voltage across the starter. Trigger point progression continues further until the second tube 110 is ready to strike, when both tubes will strike together, and drop the voltage across the starter to a value below the voltage necessary to cause triggering.
  • the starter circuit 70 will continue to the end of its progression, and then the thyristor 26 will cease conducting, allowing the other tube 10 to strike. This delay does not produce any measurable damage to the cathodes.
  • the diodes 150, 152 provide isolation between the two tubes 1 0, 110.
  • the capacitors 38, 138, if used, provide pulse - enhancement on the negative half-cycle of the supply, as described in our aforementioned German Application.
  • the resistors 154, 156 are current sharing resistors incorporated to reduce the effects of differing resistances of cathodes 14 and 114. Differences in cathode resistance may result from manufacturing tolerance, cathode type and, importantly, from ionization between the cathode supports during the starting period. Since each current sharing resistance is in series with a cathode, the whole forming a parallel network, the higher the resistance of resistors 154/156, then the smaller is the effect of differing cathode resistance.
  • the resistors 154/156 are chosen to be large enough to reduce the effect of differing cathode resistance sufficiently without being so high that excessive power is dissipated in them during starting or the total cathode pre-heat current is unduly reduced. Where the circuit components are otherwise as described in our aforementioned German Application, a suitable value for : resistors 154 and 156 is 5 ohms.
  • the circuit of Figure 1 can be modified to pass starting current on negative rather than positive half cycles of the mains A.C. supply. Not only is the starter circuit 70 reversed in polarity, i.e. the terminals 22 and 24 are connected the other way around, but also the diodes 150 and 152 must be reversed. In order to minimise the D.C. current component taken from the mains supply during starting in a large lighting installation equal numbers of starters of positive and negative half cycle starting-current types are preferably used.
  • the illustrated starter circuit 70 is based on Figure 6 of our aforementioned German Application.
  • the circuits of other figures of that application could be used, particularly Figures 1 and 4. It would be possible to use other types of starter circuits which work with unidirectional current, even though these may trigger at a fixed rather than a progressively increasing value.
  • Figure 2 illustrates how Figure 1 can be adapted for more than two lamps.
  • two further lamps 210 and 310 are shown with associated diodes 250 and 252,and resistors 254 and _256.
  • the starter circuit 70 is unchanged except that the thyristor 26 has an appropriately increased current - carrying capacity.
  • the circuit of Figure 2 is shown without the pulse enhancement capacitors (38, 138 on Figure 1) connected across the lamps, although these could be added if desired.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP81300106A 1980-02-08 1981-01-12 Circuit pour lampes à décharge Expired EP0034401B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81300106T ATE9530T1 (de) 1980-02-08 1981-01-12 Schaltung fuer entladungslampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8004226A GB2069779A (en) 1980-02-08 1980-02-08 Discharge lamp circuit
GB8004226 1980-02-08

Publications (3)

Publication Number Publication Date
EP0034401A2 true EP0034401A2 (fr) 1981-08-26
EP0034401A3 EP0034401A3 (en) 1981-09-02
EP0034401B1 EP0034401B1 (fr) 1984-09-19

Family

ID=10511201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300106A Expired EP0034401B1 (fr) 1980-02-08 1981-01-12 Circuit pour lampes à décharge

Country Status (6)

Country Link
EP (1) EP0034401B1 (fr)
AT (1) ATE9530T1 (fr)
AU (1) AU6628381A (fr)
DE (1) DE3166098D1 (fr)
GB (1) GB2069779A (fr)
NZ (1) NZ196081A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629944A (en) * 1983-03-03 1986-12-16 Texas Instruments Incorporated Starter circuit for a fluorescent tube lamp
GB2415860B (en) * 2004-06-30 2007-04-18 Nokia Corp A method of providing a radio service at a remote terminal

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488092A (en) * 1981-07-21 1984-12-11 Toichi Chikuma Illumination mode selecting device for illumination lamp
GB2204728A (en) * 1987-05-15 1988-11-16 British Aerospace Gas discharge driver circuit
DE3938676C1 (fr) * 1989-11-22 1991-06-06 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg, De
DE3938677A1 (de) * 1989-11-22 1991-05-23 Trilux Lenze Gmbh & Co Kg Leuchtstofflampen-vorschaltgeraet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079292A (en) * 1975-01-09 1978-03-14 New Nippon Electric Company, Ltd. Arc discharge sustaining circuit system for a discharge lamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079292A (en) * 1975-01-09 1978-03-14 New Nippon Electric Company, Ltd. Arc discharge sustaining circuit system for a discharge lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629944A (en) * 1983-03-03 1986-12-16 Texas Instruments Incorporated Starter circuit for a fluorescent tube lamp
GB2415860B (en) * 2004-06-30 2007-04-18 Nokia Corp A method of providing a radio service at a remote terminal

Also Published As

Publication number Publication date
GB2069779A (en) 1981-08-26
EP0034401B1 (fr) 1984-09-19
AU6628381A (en) 1981-08-13
NZ196081A (en) 1983-11-30
DE3166098D1 (en) 1984-10-25
EP0034401A3 (en) 1981-09-02
ATE9530T1 (de) 1984-10-15

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