EP0314178A1 - Circuit d'amorçage pour lampes à haute pression et à vapeur métallique - Google Patents

Circuit d'amorçage pour lampes à haute pression et à vapeur métallique Download PDF

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Publication number
EP0314178A1
EP0314178A1 EP88118033A EP88118033A EP0314178A1 EP 0314178 A1 EP0314178 A1 EP 0314178A1 EP 88118033 A EP88118033 A EP 88118033A EP 88118033 A EP88118033 A EP 88118033A EP 0314178 A1 EP0314178 A1 EP 0314178A1
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EP
European Patent Office
Prior art keywords
winding
ignition
choke
capacitor
choke winding
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
EP88118033A
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German (de)
English (en)
Other versions
EP0314178B1 (fr
Inventor
Rudolf Mühling
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.)
Zumtobel AG
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Zumtobel AG
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Publication date
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Publication of EP0314178A1 publication Critical patent/EP0314178A1/fr
Application granted granted Critical
Publication of EP0314178B1 publication Critical patent/EP0314178B1/fr
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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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices

Definitions

  • the invention relates to an ignition circuit for a high-pressure metal vapor discharge lamp according to the preamble of claim 1.
  • Such an ignition circuit is the subject of DE-OS 31 08 547. It is also shown in FIG.
  • the series inductance is formed by a choke with only one winding.
  • the series inductance and the series circuit comprising the surge capacitor and the auxiliary ignition capacitor represent a filter element. It is assumed that a positive half-wave begins after the ignition circuit is switched on to the AC network. In this case, the voltage across the surge capacitor increases with the positive half-wave. The voltage rise at the surge capacitor depends on the series inductance. The larger this is, the less the voltage increase. When the voltage across the surge capacitor reaches a certain voltage threshold, the switching element switches through, with the result that the surge capacitor discharges through the now conductive switching element and a surge occurs at the connection point between the surge capacitor and the series inductance. This surge can be several kV and leads to ionization of the lamp.
  • the series resonance circuit consisting of the series inductance and the auxiliary ignition capacitor is excited to an oscillation, which is however decaying because it is damped by the ionized tube, among other things. If the tube does not ignite, the ionization will decrease again.
  • the resonance frequency of the series resonance circuit mentioned is so chosen so that at least the half-wave of the decaying vibration following the surge voltage occurs at a time when the tube is still ionized. When the vibration subsides below the voltage threshold mentioned, the switch element becomes non-conductive again. If the lamp has not yet ignited, the process described is repeated.
  • the lamp manufacturers stipulate that at least three ignition pulses should be generated for a safe ignition per half-wave, the time interval between which is not more than 0.3 ms.
  • the series inductance formed by the choke winding limits the lamp current. From the above description it follows that the dimensioning of the ballast inductance is the function of the ignition circuit of essential importance. This is because the series inductance determines the distance between the ignition pulses, the frequency of the decaying oscillation and the current flowing through the lamp after ignition.
  • the invention has for its object to modify an ignition circuit of the type described in the preamble of claim 1 in such a way that it can also be used for high-pressure metal vapor discharge lamps of lower power than previously, the prescribed time interval between the ignition pulses and the resonance frequency of the ballast inductance and the auxiliary ignition capacitor formed series resonance circuit should remain essentially unchanged.
  • the first-mentioned choke winding determines the time interval between the ignition pulses and the frequency of the decaying oscillation, while the total of both choke windings determines the current flowing through the lamp.
  • the ignition circuit according to the invention is particularly simple and inexpensive to manufacture if both choke windings have a common choke core.
  • claims 5 to 7 relate to measures which prevent a high-frequency voltage dropping at the further choke winding from exceeding a certain voltage value. As described at the beginning, the high-frequency voltage should drop across the lamp in order to contribute to its ignition.
  • the ignition circuit shown in FIG. 1 is provided with two connections 1, 2 for the AC network and is used to ignite a high-pressure metal vapor discharge lamp 5.
  • One electrode of lamp 5 is connected to network connection 2.
  • the other electrode of lamp 5 is equipped with a superimposed ignition voltage device 4 connected.
  • a series inductance 3, which is formed by a choke with a single winding, is connected upstream of the superimposed ignition voltage device 4.
  • the series inductance 3 is on the one hand at the AC mains connection 1 and on the other hand is connected to a connection of the surge capacitor 6.
  • the other terminal of a surge capacitor 6 is connected to a terminal of an auxiliary ignition capacitor 7.
  • the other connection of the auxiliary ignition capacitor 7 is connected to the AC mains connection 2.
  • a resistor 8 is connected in parallel to the auxiliary ignition capacitor 7, which ensures compliance with the desired operating voltage range and the given limits for the phase position of the ignition pulses.
  • the connection point between the surge capacitor 6 and the auxiliary ignition capacitor 7 is connected via a high-frequency coil 14 to a connection of a switch element 9.
  • this switch element is normally non-conductive. It becomes conductive when the voltage applied to it exceeds a certain threshold voltage value. This applies in both polarity directions.
  • the switch element 9 can also be a four-layer diode, for example.
  • the other connection of the switch element 9 is connected to a connection 15 of a pulse transformer 10 connected as an autotransformer.
  • the other terminal 16 of the pulse transformer 10 is connected to the lamp 5.
  • the pulse transformer 10 is provided with a tap 13, which is connected to the connection point between the ballast inductor 3 and the surge capacitor 6.
  • the primary winding lies between the one connection 15 and the tap 13.
  • the secondary winding lies between the tap 13 and the other connection 16.
  • a transformer with separate primary and secondary windings can also be used.
  • the ignition circuit described above can be used for high-pressure metal vapor discharge lamps, which consume about 150W of power.
  • the known circuit works as follows: If the AC network is connected to the connections 1 and 2 and, for example, a positive half-wave begins, the surge capacitor 6 and the auxiliary ignition capacitor 7 are charged via the series inductance 3 during the rising phase of the half-wave. If the voltage across the surge capacitor 6 exceeds the voltage threshold value specified by the switch element 9, the switch element 9 switches through, ie there is a sudden change from the non-conductive state to the conductive state. As a result, the surge capacitor 6 is discharged via the switch element 9. This has the consequence that a voltage surge occurs at the tap 13 of the pulse capacitor 12, which is superimposed on the mains voltage at the circuit point 16 and can be several kV. This voltage surge leads to the ionization of the lamp 5.
  • the series resonance circuit formed from the series inductance 3 and the auxiliary ignition capacitor 7 is triggered, with the result that a damped oscillation occurs.
  • This is applied to the primary winding 11 of the pulse transformer 10 and is stepped up, so that after the voltage surge at the lamp 5, a decaying high-frequency oscillation of high voltage is present.
  • the resonance frequency of the series resonance circuit formed from the series inductance 3 and the auxiliary capacitor 7 is selected so that at least the first half-wave of the decaying oscillation following the voltage surge strikes the still ionized lamp 5 if the lamp 5 has not already ignited the voltage surge.
  • the high-frequency oscillation subsides below the voltage threshold value of the switch element 9 this again non-conductive.
  • This process is then repeated, at least three times per network half-wave. This is prescribed by the lamp manufacturers for reliable ignition of the lamp 5, the time interval between the ignition pulses not being greater than 0.3 ms.
  • the series inductance 3 limits the lamp current to the current corresponding to the nominal power of approximately 150W.
  • the series inductance 3 accordingly determines the time interval between the ignition pulses and the frequency of the decaying oscillation and also serves to limit the current flowing through the lamp 5 after ignition.
  • the circuits shown in FIGS. 2 to 4 serve to ignite lamps 105, 205 which have a lower output than lamp 5 in FIG. 1. Lamps with a power of 35 or 70W are typical. Such lamps have to be limited to a correspondingly lower current because of their lower power consumption.
  • the ignition circuit according to FIG. 2 has a series inductance 103 which, as before, is formed by a single choke, which, however, has a further choke winding 108 in addition to a first choke winding 104. Both choke windings 104, 108 sit on the same core.
  • the first choke winding 104 is connected like the single choke winding forming the series inductance 3 shown in the known ignition circuit according to FIG. 1.
  • the second choke winding 108 is connected between the lamp 105 and the terminal 2 of the AC source. It is also bridged by a short-circuit capacitor 106. In this way, only the first choke winding 104 forms a series circuit with the surge capacitor 6 and the auxiliary ignition capacitor 7, with the result that the time interval between the ignition pulses and the resonance frequency of the first choke winding 104 and the auxiliary ignition condenser Series 7 resonant circuit formed remain largely unchanged from the corresponding values of the circuit of Figure 1. If, however, the lamp 105 has ignited, the second choke winding 108 is in the circuit of the lamp in addition to the first choke winding 104, with the result that the lamp current is limited to a correspondingly reduced value.
  • FIG. 5 shows the time course of the ignition voltage generated at point 16 of the ignition circuit according to FIG. 2. It can be seen that three ignition pulses occur per network half-wave.
  • FIG. 6 was created while stretching the time of FIG. 5 and shows three firing pulses in succession during a mains half-wave, whereby it can be seen that the first voltage surge is followed by a decaying oscillation.
  • the two choke windings 204, 208 are galvanically connected to one another by the tap 209.
  • the first winding 204 is connected on the one hand to the mains connection 1 and on the other hand via the tap 209 to the surge capacitor 6.
  • the second winding 208 is on the one hand via the tap 209 to the surge capacitor 6 and on the other hand to the tap 13 of the pulse transformer 10 connected.
  • connection of the second winding 208 connected to the tap 13 of the pulse transformer 10 is also connected via a return capacitor 206 connected to the other network connection 2.
  • this ignition circuit with the auxiliary ignition capacitor 7 and the surge capacitor 6, in turn only the first winding 204 of the series inductor 203 is in series, as a result of which, as described in connection with the ignition circuit according to FIG. 2, the time interval between the ignition pulses and the resonance frequency compared to the known one Ignition circuit according to Figure 1 remain largely unchanged.
  • both windings 204, 208 are in series in the circuit of the lamp, with the result that the lamp current is limited to a correspondingly reduced value.
  • the ignition circuit according to FIG. 4 differs from the ignition circuit according to FIG. 3 only in that the second winding 208 of the series inductance 203 is bridged here directly by a return capacitor 210.
  • VDR voltage-dependent resistor

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP88118033A 1987-10-28 1988-10-28 Circuit d'amorçage pour lampes à haute pression et à vapeur métallique Expired - Lifetime EP0314178B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873736542 DE3736542A1 (de) 1987-10-28 1987-10-28 Zuendschaltung fuer eine hochdruckmetalldampfentladungslampe
DE3736542 1987-10-28

Publications (2)

Publication Number Publication Date
EP0314178A1 true EP0314178A1 (fr) 1989-05-03
EP0314178B1 EP0314178B1 (fr) 1994-10-19

Family

ID=6339283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118033A Expired - Lifetime EP0314178B1 (fr) 1987-10-28 1988-10-28 Circuit d'amorçage pour lampes à haute pression et à vapeur métallique

Country Status (3)

Country Link
EP (1) EP0314178B1 (fr)
AT (1) ATE113157T1 (fr)
DE (2) DE3736542A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595333A1 (fr) * 1992-10-28 1994-05-04 Tridonic Bauelemente GmbH Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique
DE19544842A1 (de) * 1995-12-01 1997-06-05 Bosch Gmbh Robert Eingangsbeschaltung für eine Zündvorrichtung einer Hochdruck-Gasentladungslampe
DE19531623B4 (de) * 1995-08-28 2010-09-23 Tridonicatco Gmbh & Co. Kg Verfahren und Schaltungsanordnung zum Zünden einer Hochdruck-Gasentladungslampe
DE19531622B4 (de) * 1995-08-28 2011-01-13 Tridonicatco Gmbh & Co. Kg Zündschaltung für eine Hochdruck-Gasentladungslampe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB824906A (en) * 1957-10-15 1959-12-09 Engelhard Ind Inc Improvements in or relating to an operating circuit for electrical discharge lamps
US4187449A (en) * 1978-05-08 1980-02-05 General Electric Company Discharge lamp operating circuit
US4538094A (en) * 1983-08-12 1985-08-27 Iota Engineering Co. Lamp ballast with near unity power factor and low harmonic content

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB824906A (en) * 1957-10-15 1959-12-09 Engelhard Ind Inc Improvements in or relating to an operating circuit for electrical discharge lamps
US4187449A (en) * 1978-05-08 1980-02-05 General Electric Company Discharge lamp operating circuit
US4538094A (en) * 1983-08-12 1985-08-27 Iota Engineering Co. Lamp ballast with near unity power factor and low harmonic content

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595333A1 (fr) * 1992-10-28 1994-05-04 Tridonic Bauelemente GmbH Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique
DE19531623B4 (de) * 1995-08-28 2010-09-23 Tridonicatco Gmbh & Co. Kg Verfahren und Schaltungsanordnung zum Zünden einer Hochdruck-Gasentladungslampe
DE19531622B4 (de) * 1995-08-28 2011-01-13 Tridonicatco Gmbh & Co. Kg Zündschaltung für eine Hochdruck-Gasentladungslampe
DE19544842A1 (de) * 1995-12-01 1997-06-05 Bosch Gmbh Robert Eingangsbeschaltung für eine Zündvorrichtung einer Hochdruck-Gasentladungslampe

Also Published As

Publication number Publication date
DE3851868D1 (de) 1994-11-24
DE3736542A1 (de) 1989-05-11
ATE113157T1 (de) 1994-11-15
EP0314178B1 (fr) 1994-10-19

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