EP0470453B1 - Elektronisches Vorschaltgerät mit Repetitionsschaltung - Google Patents

Elektronisches Vorschaltgerät mit Repetitionsschaltung Download PDF

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Publication number
EP0470453B1
EP0470453B1 EP91112565A EP91112565A EP0470453B1 EP 0470453 B1 EP0470453 B1 EP 0470453B1 EP 91112565 A EP91112565 A EP 91112565A EP 91112565 A EP91112565 A EP 91112565A EP 0470453 B1 EP0470453 B1 EP 0470453B1
Authority
EP
European Patent Office
Prior art keywords
lamp
voltage
circuit
capacitor
starting device
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.)
Expired - Lifetime
Application number
EP91112565A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0470453A1 (de
Inventor
Peter Horn
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.)
Knobel AG Lichttechnische Komponenten
Original Assignee
Knobel AG Lichttechnische Komponenten
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 Knobel AG Lichttechnische Komponenten filed Critical Knobel AG Lichttechnische Komponenten
Publication of EP0470453A1 publication Critical patent/EP0470453A1/de
Application granted granted Critical
Publication of EP0470453B1 publication Critical patent/EP0470453B1/de
Anticipated expiration legal-status Critical
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
    • H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices

Definitions

  • the invention relates to an electronic starter according to the preamble of patent claim 1.
  • a starter together with a ballast such as e.g. in EP-A-118 309 describes the possibility to re-ignite a lamp if a first ignition process is unsuccessful.
  • EP-A-078 790 describes a starter of the type mentioned at the outset, but its circuitry is quite complex. It includes digital logic with an integrated counter, which is relatively expensive and requires its own power supply.
  • a circuit is also preferably provided which deactivates the repetition circuit when a predetermined temperature is reached, which is determined by means of a temperature sensor. This prevents possible damage to the ballast due to the repetition of the starting process.
  • the temperature sensor is arranged on a common substrate together with the semiconductor switches and / or diodes and / or high-voltage resistors carrying the preheating current.
  • FIG. 1 shows a lamp circuit with a fluorescent lamp connected to AC voltage (as a rule mains voltage).
  • the connection is made in a known manner via an inductor L and possibly with a capacitor C.
  • an electronic ballast with a fluorine actuator 3 is shown, as is known in principle from European Patent Application EP-A-118 309. Its function can be explained on the basis of the voltage profiles according to FIGS. 2a to 2d.
  • the Fluoractor 3 is controlled via its control input and goes into the conductive state.
  • the preheating current I L flows through the hot cathodes of lamp 1.
  • the capacitor C1 is charged; the corresponding voltage U2 is ramped with a superimposed ripple.
  • FIG. 1 An embodiment of the repetition circuit according to the invention is shown in Figure 1 with the transistors T1, T2 and T3.
  • the circuit speaks to the Voltage U4 across the lamp, which is much lower when the lamp is on than when the lamp is not on (not successfully ignited).
  • the operating voltage is, for example, approx. 120 volts, whereas the voltage for a non-burning lamp is 230 volts.
  • the repeater circuit responds to this difference in order to initiate a repetition when the lamp is not lit.
  • the criterion used here is the voltage U5 across a capacitor C2 which is connected to the lamp voltage U4 via a resistor.
  • the ramp-shaped voltage U5 (FIG. 3b) reaches the value of the Zener voltage U Z of the Zener diode Z1. This leads to the switching of the transistors T1 to T3.
  • capacitor C2 is discharged.
  • the transistor T3 is connected to the time-determining capacitor C1 of the starter circuit. This capacitor C1 is discharged by the transistor T3, or the voltage U2 is set to a low value. This means that the thyristor 4 blocks again at the next zero point of the voltage U4.
  • the transistor T3 also goes into the off state due to the discharge of C2 or the drop in U5.
  • Thyristor 4 blocks and the high potential of U3 allows the fluorine actuator to conduct.
  • the voltage U2 across the capacitor C1 rises in a ramp until the thyristor 4 switches through.
  • the holding current is reached by the fluorine actuator 3, it blocks and a renewed ignition pulse is generated.
  • the voltage U4 drops to the lower operating voltage, for example to 120 volts, which means that the voltage U5 does not reach the value U Z.
  • the repeater circuit remains inactive. If the lamp does not ignite again, the repetition process begins again.
  • the high voltage U4 causes the voltage U5 to rise to the value U Z , the transistors T1 to T3 switch through briefly, T3 discharges C1 and the Fluoractor 3 returns to the control state for preheating.
  • a temperature sensor which interrupts the repetition at the higher temperatures in the ballast that arise due to repeated repetition.
  • an NTC resistor 6 is connected in parallel with the capacitor C2 as a temperature sensor.
  • the resistance value of the parallel circuit NTC 6 and R9 drops to a value that prevents the capacitor C2 from charging up to the level U Z ; the repetition circuit is thus deactivated as long as the temperature at the temperature sensor is higher than the predetermined value, for example 90 degrees Celsius.
  • FIG. 5 shows the different course of the switching thresholds for T1, Z1 and NTC 6, thyristor 7. At temperatures of, for example, below 90 degrees Celsius, U5 first reaches the switching threshold U Z of the repetition circuit, which is thus activated. At temperatures above 90 degrees Celsius, the temperature-dependent threshold voltage U s is first reached, at which the thyristor 7 switches on. The repeater circuit is not active.
  • the temperature sensor 6 is preferably in heat flow connection with at least one element carrying the preheating current, for example with the fluorine actuator, the rectifier diodes and the high-voltage resistors.
  • at least one element carrying the preheating current for example with the fluorine actuator, the rectifier diodes and the high-voltage resistors.
  • several of these elements and the Temperature sensor arranged on a common, thermally conductive substrate, such as an Al2O3 substrate.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Interface Circuits In Exchanges (AREA)
EP91112565A 1990-08-10 1991-07-26 Elektronisches Vorschaltgerät mit Repetitionsschaltung Expired - Lifetime EP0470453B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2607/90 1990-08-10
CH2607/90A CH680968A5 (enrdf_load_stackoverflow) 1990-08-10 1990-08-10

Publications (2)

Publication Number Publication Date
EP0470453A1 EP0470453A1 (de) 1992-02-12
EP0470453B1 true EP0470453B1 (de) 1995-09-20

Family

ID=4237570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112565A Expired - Lifetime EP0470453B1 (de) 1990-08-10 1991-07-26 Elektronisches Vorschaltgerät mit Repetitionsschaltung

Country Status (4)

Country Link
EP (1) EP0470453B1 (enrdf_load_stackoverflow)
AT (1) ATE128315T1 (enrdf_load_stackoverflow)
CH (1) CH680968A5 (enrdf_load_stackoverflow)
DE (1) DE59106515D1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082193A (en) * 1958-03-06 1963-03-19 Yardney International Corp Metal-polyvinylpyrrolidone compound and process for preparing same
WO1996022007A1 (en) * 1995-01-13 1996-07-18 Yeong Choon Chung Electronic starter for fluorescent lamp
WO2009101552A1 (en) 2008-02-14 2009-08-20 Koninklijke Philips Electronics N.V. Device for controlling a discharge lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1026817A (en) * 1972-05-09 1978-02-21 Michel Remery Electrical circuit for igniting and supplying a discharge lamp
EP0078790A3 (de) * 1981-11-02 1983-09-21 Franz Wittmann Schaltungsanordnung zur elektronischen Zündung von Gasentladungslampen
GB8703284D0 (en) * 1987-02-12 1987-03-18 Martin D J Electronic starter for fluorescent lamps

Also Published As

Publication number Publication date
CH680968A5 (enrdf_load_stackoverflow) 1992-12-15
DE59106515D1 (de) 1995-10-26
EP0470453A1 (de) 1992-02-12
ATE128315T1 (de) 1995-10-15

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