EP0411618B1 - Elektronisches Vorschaltgerät für Gasentladungslampen - Google Patents

Elektronisches Vorschaltgerät für Gasentladungslampen Download PDF

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Publication number
EP0411618B1
EP0411618B1 EP90114792A EP90114792A EP0411618B1 EP 0411618 B1 EP0411618 B1 EP 0411618B1 EP 90114792 A EP90114792 A EP 90114792A EP 90114792 A EP90114792 A EP 90114792A EP 0411618 B1 EP0411618 B1 EP 0411618B1
Authority
EP
European Patent Office
Prior art keywords
signal
voltage
circuit part
electronic ballast
tripping
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
EP90114792A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0411618A2 (de
EP0411618A3 (en
Inventor
Wolfgang Dr. Pabst
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
Original Assignee
Zumtobel AG
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 Zumtobel AG filed Critical Zumtobel AG
Publication of EP0411618A2 publication Critical patent/EP0411618A2/de
Publication of EP0411618A3 publication Critical patent/EP0411618A3/de
Application granted granted Critical
Publication of EP0411618B1 publication Critical patent/EP0411618B1/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
    • H05B41/14—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
    • H05B41/295—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 and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • 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
    • H05B41/295—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 and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2983—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal power supply conditions

Definitions

  • the invention relates to an electronic ballast (EVG) for gas discharge lamps according to the preamble of claim 1.
  • EMG electronic ballast
  • Such a device is known, for example, from EP 0 146 683.
  • a converter is switched off by means of a bistable switching device if the gas discharge lamp used is permanently unwilling to start, that is to say repeated unsuccessful start attempts.
  • This is achieved by short-circuiting a secondary shutdown winding of a saturation transformer, the primary winding of which is connected to the lamp circuit.
  • this saturation transformer In the operating state of the electronic ballast, this saturation transformer generates base voltages with further secondary windings, by means of which two alternating switching transistors generate an alternating voltage signal.
  • the inverter is and will remain in the switched-off state until it is interrupted by switching off the electronic ballast or removing the gas discharge lamp that does not ignite.
  • the invention has for its object to design an electronic ballast of the type mentioned so that its operational safety is further increased.
  • the invention makes use of the idea of expanding the shutdown mechanism by at least one additional branch, which monitors the intermediate circuit voltage.
  • This measure according to the invention avoids excessive thermal loads on sensitive components, for example the rectifier or the output transistors, which may be a result of excessive DC link voltage.
  • EDG electronic ballast
  • a development of the solution specified in claim 1 or an alternative solution is the subject of claim 7. This is based on detecting the load current and triggering the shutdown of the oscillator circuit part when a predetermined maximum value is exceeded.
  • EVG electronic ballast 1
  • EVG electronic ballast 1
  • One or two gas discharge lamps 2 can be connected to this electronic ballast.
  • a directly heated gas discharge lamp 2 has four connections which are connected to the electronic ballast 1.
  • One connection each of two opposing heating coils 22, 23 is connected via a heating capacitor C H.
  • FIG. 2 shows a block diagram of an electronic ballast 1 according to FIG. 1.
  • the mains input voltage is supplied via a rectifier 10 with a possible step-up converter connected downstream (in particular in the case of battery operation). Its output signal is fed to a smoothing device 11 with a smoothing capacitor (DC link capacitor) C Z , which provides a DC link voltage U Z.
  • the intermediate circuit voltage U Z is fed to an inverter 4, which provides an alternating signal u W for at least one gas discharge lamp 2 at its output connections.
  • a shutdown-hold circuit arrangement 3 on the one hand one of the output alternating voltage u W of the inverter 4 is amplitude-proportional voltage u 1 and on the other hand a voltage u 2 proportional to the intermediate circuit direct voltage U Z is supplied.
  • the circuit arrangement 3 generates a switch-off or release signal u S , via which the inverter 4 switches on or off. can be switched off.
  • This shutdown signal u S is generated by an OR operation of the two measured signals u2 and u1, if necessary after rectification and smoothing.
  • Fig. 3 shows a detailed circuit diagram of the logical OR operation in connection with other modules essential to the function.
  • the intermediate circuit capacitor C Z has already been explained.
  • the load circuit arranged between the positive output connection + and the series circuit comprising two circuit breakers S1 and S2 has, in addition to the usual gas discharge lamp 2 with heating capacitor C H, the series circuit comprising an oscillating circuit inductance L O and an oscillating circuit capacitance C O. It is also a saturation transformer Ü with primary winding n1 and secondary windings n2, n2 'the load circuit can be connected in series. This serves (as an oscillator circuit arrangement 8) for generating the base voltage signals of the circuit breakers S1 and S2.
  • the series connection of the power semiconductors S1 and S2 connects the positive output connection + to the negative output connection -, these two connections correspond to the positive and negative connection of the smoothing capacitor C Z of the smoothing device 11.
  • the intermediate circuit capacitor C Z is bridged with the series connection of a third resistor R4 and a fourth resistor R5.
  • This voltage divider provides a second signal u2 proportional to the intermediate circuit direct voltage U Z in parallel with the fourth resistor R5.
  • the anode of another diode D4 is connected at the connection point between the resistors R4 and R5, its cathode is connected to the resistor R6 like the cathode of the diode D2.
  • At R6 is therefore always the greater voltage of the voltages u1 and u2.
  • the diodes D2 and D4 each have a resistor R18, R13 can be connected in series.
  • Fig. 4 shows, as an alternative to the disjunctive link described in Fig. 3 in diode transistor logic, an OR gate, the three signals u1, u2 and u3 can be supplied.
  • the first signal u2 and second signal u2 correspond to the derived from the load voltage and rectified signal u1 shown in FIG. 3 and the derived from the intermediate circuit voltage by a division ratio second signal u2. Both are coupled to resistor R6.
  • the third signal u 3 shown here can alternatively be coupled either via the OR gate 6 or directly into the shutdown-hold circuit arrangement. It is a switch-off signal dependent on the load current.
  • the low pass consists of either Series connection of a resistor R10 and C11 or from a parallel connection of a capacitor C11 and a resistor R11.
  • the connected to the capacitor C11 trigger diode 7 controls the gate terminal of a thyristor 5. It specifies a threshold voltage with which the response threshold of the shutdown-hold circuit arrangement 3 is adjustable.
  • This response threshold is predetermined in terms of amplitude, but can be delayed in time by the low-pass circuit, so that on the one hand any amplitude can be set and on the other hand any response speed can be specified.
  • the amplitude is set via the divider ratio R4 / R5 or via the divider ratio R10 / R11.
  • the time delay can be set either by the capacitor C6 or the capacitor C11.
  • the different shutdown signals u1, u2 or u3 different response speeds and response amplitudes can be assigned. For example, the coupling of the current-dependent signal u3 via the series circuit of a diode D12 and a resistor R12 directly to the gate terminal of the (forming a bistable shutdown element) thyristor 5 is shown. Different response amplitudes are achieved through the different threshold voltages.
  • the anode circuit of the thyristor 5 also has a holding current generating resistor R14, which is connected with its one connection via the first heating coil 22 of the gas discharge lamp 2 to the positive connection of the intermediate circuit capacitor C Z and the second connection of which is connected to the anode of the thyristor 5.
  • This connection point between the holding current generating resistor R14 and the anode of the thyristor 5 is the oscillator 8 to switch off its oscillation or to prevent base voltages for the Semiconductor switches S1 and / or S2 supplied.
  • Fig. 5 shows a detailed circuit diagram of one of the power semiconductors S1 and S2, as they are driven either by the oscillator 8 directly or via a saturation transformer Ü with a primary winding n1 and a plurality of secondary windings n2, n2 '.
  • the power semiconductor S2 has the series circuit comprising a power transistor and an emitter resistor R E. Its base potential is generated depending on the load current via one of the several secondary windings n2 of the saturation transformer Ü via the series connection of a small choke and a diode.
  • a voltage proportional to the load current u3 with respect to the negative terminal - of the intermediate circuit capacitor C Z is now measurable.
  • FIG. 6 shows a partial circuit diagram of an electronic ballast 1 according to FIG. 1 with a single gas discharge lamp 2 as a load.
  • the rectifier 10 the intermediate circuit capacitor C Z , the circuit breaker S1, S2, the oscillator 8 and the holding circuit via resistor R14.
  • a rectifier 10 is connected upstream of the rectifier 10 with the capacitor C X.
  • the capacitor C Z is connected in parallel from the resistor R4 and the resistor R5. At the center tap between these two Resistors with respect to the negative connection - the intermediate circuit capacitor C Z, an intermediate circuit voltage-dependent signal u2, as described, is coupled via the series circuit of diode D4 and an additional resistor R13 to the capacitor C6.
  • an AC voltage component coupled out of the load circuit via the capacitor C1 is coupled via the second disjunctive linking branch, the series circuit comprising diode D2 and additional resistor R18, onto the same capacitor C6.
  • the voltage across the capacitor C6 u s ' controls via the series connection of the resistors R15, R16, R17 to the negative supply connection - and the resistor R15 connected in parallel trigger diode 7 the resistor R17 connected in parallel gate circuit of the turn-off thyristor 5th
  • Fig. 6 also shows a further variant in which the load current-dependent signal u3 over a in the negative supply line between the switch S1 and the negative supply connection - of the electronic ballast to gain measuring resistor R Sh . It is fed directly to the gate circuit of the thyristor with the series circuit of diode D3 and resistor R19. To set the threshold voltage, several diodes are to be connected in series instead of one diode D3.
  • this overvoltage shutdown measure is set according to the following table. In the present case, it is effective at mains voltages of greater than 280V eff .

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Pipeline Systems (AREA)
  • Discharge Lamp (AREA)
  • Inverter Devices (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Air Bags (AREA)
  • Connecting Device With Holders (AREA)
  • Electron Sources, Ion Sources (AREA)
EP90114792A 1989-08-04 1990-08-01 Elektronisches Vorschaltgerät für Gasentladungslampen Expired - Lifetime EP0411618B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3925899A DE3925899A1 (de) 1989-08-04 1989-08-04 Elektronisches vorschaltgeraet fuer gasentladungslampen
DE3925899 1989-08-04

Publications (3)

Publication Number Publication Date
EP0411618A2 EP0411618A2 (de) 1991-02-06
EP0411618A3 EP0411618A3 (en) 1992-07-22
EP0411618B1 true EP0411618B1 (de) 1994-03-02

Family

ID=6386555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114792A Expired - Lifetime EP0411618B1 (de) 1989-08-04 1990-08-01 Elektronisches Vorschaltgerät für Gasentladungslampen

Country Status (7)

Country Link
EP (1) EP0411618B1 (no)
AT (1) ATE102429T1 (no)
DE (2) DE3925899A1 (no)
DK (1) DK0411618T3 (no)
ES (1) ES2050897T3 (no)
FI (1) FI96657C (no)
NO (1) NO177210C (no)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4120649A1 (de) * 1991-06-22 1992-12-24 Vossloh Schwabe Gmbh Ueberspannungsgeschuetztes vorschaltgeraet
DE19619580A1 (de) * 1996-05-15 1997-11-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Sicherheitsabschaltung bei asymmetrischer Lampenleistung
DE10163034B4 (de) * 2001-12-20 2014-08-28 Tridonic Gmbh & Co Kg Elektronisches Vorschaltgerät mit Überspannungsüberwachung
DE102004002027B4 (de) 2004-01-14 2020-03-26 Tridonic Gmbh & Co Kg Zentraler PFC mit DC-Ausgangskreisregelung
DE102005028419A1 (de) * 2005-06-20 2006-12-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Abschaltschaltung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117192B (en) * 1982-02-26 1986-01-02 Transtar Limited Lamp control circuit
US4538095A (en) * 1983-06-03 1985-08-27 Nilssen Ole K Series-resonant electronic ballast circuit
AT390156B (de) * 1985-05-14 1990-03-26 Zumtobel Ag Schutzschaltung fuer eine wechselrichterschaltung
FR2625642A1 (fr) * 1987-12-31 1989-07-07 Courier De Mere Henri Ballast electronique a haut facteur de puissance
US5068570A (en) * 1989-01-26 1991-11-26 Koito Manufacturing Co., Ltd. Lamp lighting circuit with an overload protection capability

Also Published As

Publication number Publication date
NO177210B (no) 1995-04-24
DE3925899A1 (de) 1991-02-07
FI903809A0 (fi) 1990-07-31
DE59004747D1 (de) 1994-04-07
FI96657C (fi) 1996-07-25
NO177210C (no) 1995-08-02
EP0411618A2 (de) 1991-02-06
NO903421L (no) 1991-02-05
ATE102429T1 (de) 1994-03-15
FI96657B (fi) 1996-04-15
EP0411618A3 (en) 1992-07-22
DK0411618T3 (da) 1994-03-28
NO903421D0 (no) 1990-08-03
ES2050897T3 (es) 1994-06-01

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