EP0871347A1 - Ballast à réamorçage automatique - Google Patents

Ballast à réamorçage automatique Download PDF

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Publication number
EP0871347A1
EP0871347A1 EP98106202A EP98106202A EP0871347A1 EP 0871347 A1 EP0871347 A1 EP 0871347A1 EP 98106202 A EP98106202 A EP 98106202A EP 98106202 A EP98106202 A EP 98106202A EP 0871347 A1 EP0871347 A1 EP 0871347A1
Authority
EP
European Patent Office
Prior art keywords
switch
voltage
supply voltage
gas discharge
ballast according
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
EP98106202A
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German (de)
English (en)
Other versions
EP0871347B1 (fr
Inventor
Gert Knobloch
Peter Haaf
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.)
Vossloh Schwabe Elektronik GmbH
Original Assignee
Vossloh Schwabe GmbH
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 Vossloh Schwabe GmbH filed Critical Vossloh Schwabe GmbH
Publication of EP0871347A1 publication Critical patent/EP0871347A1/fr
Application granted granted Critical
Publication of EP0871347B1 publication Critical patent/EP0871347B1/fr
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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to an electronic ballast with the features of the preamble of the claim 1.
  • the invention relates to an externally controlled Ballast, its inverter frequency is set by a controlled oscillator.
  • E.g. is an electronic from DE 44 10 492 A1 Ballast with a free-swinging inverter became known who when a maximum lamp voltage is stopped. This is on the connection of the discharge lamp to which AC voltage is applied a voltage divider connected its Output via a four-layer diode to the gate of a thyristor is laid.
  • the thyristor is on a base connection the inverter half bridge connected and locks the inverter when it is ignited. Exceeds the voltage present at the gas discharge lamp a threshold value, the thyristor thus switches the Inverter.
  • the thyristor is connected through a resistor supplied with current from the DC link voltage and thus keeps in the conductive state.
  • For restarting of the electronic ballast is after changing the lamp an at least brief separation of the ballast required by the network. However, often an automatic restart is required, i.e. after changing the lamp should the electronic ballast without further measures to be ready for operation again and the low pressure gas discharge lamp supply with current or voltage.
  • the circuit is, for example, from EP 0 239 793 B1 of a free-swinging electronic ballast became known in the case of the faulty, too high lamp voltages leading behavior of a gas discharge lamp about the increased voltage drop across a resonance inductor is captured with the lamp in series lies.
  • the resonance inductance couples with a secondary winding, via a trigger circuit to the control electrode a thyristor is connected. This grounds the base of an inverter transistor in the event of a fault, to make the inverter circuit inactive switch.
  • the thyristor is connected via a resistor combination from the DC link voltage with a holding current provided.
  • ballast In order to set the Lamp implemented power or the applied voltage and to be able to make the flowing currents and around Effects of properties of the gas discharge lamp to avoid the operation of the ballast the trend towards externally controlled ballasts with work at a predetermined frequency.
  • a ballast is known, for example, from EP 0 727 921 A2.
  • the electronic Ballast contains a generator circuit to generate an AC lamp voltage, the generator circuit Can be stopped via a control input is.
  • a voltage monitor is connected to this, which turns off the generator circuit when a maximum voltage on the lamp is exceeded. More specifically is a corresponding generator circuit from the application notes for the L 6569 from SGS Thomson Microelektronics known.
  • the generator described there has control connections for controlling an inverter half bridge on, and works at an operating voltage of, for example, 15 volts. If this operating voltage is below lowered a predetermined threshold UVLO, the Circuit the connected inverter half bridge. The operating voltage can be reduced via a thyristor take place, then from the DC link voltage continues to be supplied with a holding current.
  • the electronic ballast has one of one Control circuit controlled half-bridge on the Output of one or more low pressure gas discharge lamps are connected. If there are several gas discharge lamps these connected in series.
  • the control circuit sets the Frequency at which the inverter half bridge works firmly, so that interference due to tolerances of Lamp parameters on the operating frequency largely excluded or reduced.
  • the control circuit comes with a supply voltage powered by a controlled switch be reduced to a value with self-holding characteristics which has a UVLO (Undervoltagelockout) threshold falls below.
  • the controlled switch is from a monitoring circuit for the lamp voltage controlled. If the lamp voltage exceeds a permissible one Dimension, this is seen as a sign that the Lamp is defective and the controlled switch lowers the Operating voltage of the control circuit under UVLO.
  • the second controlled switch which is also connected to the Supply voltage of the control circuit connected can, if it is activated, lower it even further.
  • the first is controlled Switch a fixed potential offset generating circuit connected in series. This circuit can be, for example, a Z diode, so that when the first switch the supply voltage approximately to the Z voltage collapses.
  • the second controlled switch now lowers the supply voltage when activated below this Z voltage, causing the self-latching switch is de-energized and therefore blocked.
  • the second controlled Switch is activated by a monitoring circuit, which has a sensor circuit that at least leads a lamp filament. Is the spiral broken or the lamp is pulled (i.e. from the electronic ballast disconnected), the second switch is activated the electronic ballast still is stopped.
  • the first self-holding switch the has overvoltage shutdown, however locked again. If now an intact lamp with the ballast is connected via the heating coil leading current path the second switch locked, and the control circuit receives its full supply voltage again. It now controls the inverter half bridge so that the lamp used is ignited and burns.
  • the corresponding monitoring circuit can therefore be designed to have a relatively high impedance, which reduces the effects on the low-pressure gas discharge lamp and the required power loss. If the first controlled switch is formed by a circuit formed by two transistors of different conductivity types, as mentioned in claim 2, very low holding currents are made possible, which minimizes the power loss in a supply resistance leading to the intermediate circuit voltage. There is also an inexpensive solution. If necessary, however, an appropriately selected thyristor can also be used.
  • the one essentially fixed potential offset generating circuit can be by a zener diode or a other component are formed, which is a comparable Has characteristic. It is sufficient if the generated potential offset is approximately constant, like it is the case, for example, if the dynamic resistance of the Component is not zero but is relatively low.
  • the second controlled switch is preferably a pnp transistor connected as an emitter follower whose base is connected to ground with high resistance. Besides, is the base is connected to a sensing circuit with high impedance Series resistors over at least one coil of Gas discharge lamp leads. If this sensing circuit is interrupted, the small one above the basic series resistor of the Current flowing to transistor to ground this out to convert its locked state into a state in which he conducts and takes over the holding current of the thyristor. The transistor does not need to be fully switched on or even get saturated. That makes one very low power circuit.
  • FIG. 1 An electronic ballast 1 is shown in FIG shown in the block diagram that the operation of a Low pressure gas discharge lamp 2 is used.
  • the electronic Ballast 1 has a line rectifier and converter circuit 3, which has an intermediate circuit voltage of outputs about 400 volts to ground 4.
  • the swap body half bridge 6 is between the intermediate circuit voltage and ground 4 switched.
  • the inverter half bridge 6 a preferably an integrated circuit, such as
  • the integrated Circuit of the control circuit 11 is with a provided external circuit, not shown, the sets a certain working frequency. This means, that control signals at the output connections 12, 13 in push-pull for the MOSFETs 7, 8 with a given Frequency so that the MOSFETs 7, 8 alternately, however, do not open overlapping or become conductive.
  • the control circuit 11 has a supply voltage connection V CC , via which it is provided with supply voltage and at the same time with information as to whether it should control or block the MOSFETs 7, 8: If the supply voltage V CC controls a defined threshold value UVLI (undervoltage lockin) the control circuit 11 alternately opens and closes the MOSFETs 7, 8 at a frequency which is predetermined by the external circuitry. If the supply voltage V CC falls below the threshold value UVLO, both MOSFETs 7, 8 are blocked.
  • V CC controls a defined threshold value UVLI (undervoltage lockin) the control circuit 11 alternately opens and closes the MOSFETs 7, 8 at a frequency which is predetermined by the external circuitry. If the supply voltage V CC falls below the threshold value UVLO, both MOSFETs 7, 8 are blocked.
  • UVLI undervoltage lockin
  • the supply voltage is generated when the electronic ballast 1 is running, i.e. the low pressure gas discharge lamp 2 lights up from the of the Inverter half bridge 6 generated square wave voltage.
  • Two capacitors C1 and C2 are used, both with one connection each with a connection point 16 connected to the output of the inverter half bridge 6 forms.
  • the connection point 16 is through the Connection of source and drain formed by the MOSFETs 7, 8.
  • Over with capacitors C1 and C2 in series switched diodes D1, D2 are at the inverter frequency from about 30 kHz charge packets to one against Ground 4 switched smoothing or buffer capacitor C3 pumped from which the supply voltage to the corresponding supply voltage connection of the control circuit 11 is performed.
  • a voltage surge will prevented by a Zener diode DZ1 which is connected to the anode of D1 connected and connected to ground with its own anode is.
  • a resistor R1 is provided, which has one end with the DC link voltage and with its other end is connected to the capacitor C3. About the resistance R1, capacitor C3 is charged with a low current, until the voltage on the capacitor C3 the Threshold voltage exceeds UVLI and the control circuit 11 starts.
  • the one to be operated by the electronic ballast 1 Gas discharge lamp 2 is indirect via a Resonance choke L1 and a coupling capacitor C4 to the Connection point 16 connected to the output of the Inverter half bridge 6 forms and with that of the control circuit 11 predetermined frequency between the DC link voltage and ground switched back and forth becomes.
  • the series connection of the resonance choke L1 and the Coupling capacitor C4 is via a not shown Lamp holder with a connection 21 of the gas discharge lamp 2 connected.
  • the connection leads via a filament 22 lying in the gas discharge lamp 2 into one Connection 23 to the outside, via a resonance capacitor C5 at a further connection 24 of the gas discharge lamp 2 is connected to a coil 25 and via this to a connection 26 which is connected to the DC link voltage is connected.
  • a voltage monitoring circuit 27 which has a high-resistance resistor R2 with the lamp-side end of the resonance choke L1 is connected.
  • the voltage monitoring circuit 27 contains on the input side another input resistor R3, which with the Resistor R2 forms a voltage divider, and the against Ground 4 is switched.
  • the input resistance is R3 followed by a voltage doubler circuit 28 which that outputs a DC voltage signal at its output 29 corresponds to the lamp voltage.
  • the output 29 is with a control input 31 of a first controllable switch 32 connected, connected at one end to ground 4 is. Its other end is via a voltage offset circuit 33 with the supply voltage of the control circuit 11 connected.
  • the switch 32 is replaced by a npn transistor T1 and a pnp transistor T2 formed.
  • the T1 emitter is connected to ground 4 and its collector is connected to the base of T2.
  • the collector of T2 is connected to the base of T1, which is also via a resistor R4 and a capacitor C5 to ground 4 is switched.
  • the base of T2 is through a resistor R5 and a capacitor C6 connected to its emitter.
  • the transistors T1 and T2 form a bistable Circuit that is either a non-conductive state occupies the distance from the emitter of the Transistor T2 blocked to the emitter of transistor T1 is (locked state) or conducts (leading state).
  • the voltage signal at the control input 31 becomes the switch 32 via a Zener diode DZ3 from its blocking state to its Lead state transferred that maintained for so long until an adjustable by the resistors R4, R5 below the holding current. In leading condition the emitter of transistor T2 is almost at ground 4.
  • the voltage offset circuit 33 which in the simplest case is formed by a Zener diode DZ2, has a voltage drop that is less than the threshold voltage UVLO.
  • the control circuit 11 is thus deactivated when the switch 32 conducts. If the voltage monitoring circuit 27 detects an excessively high voltage on the gas discharge lamp 2, it switches the switch 32 to its conductive state, as a result of which the latter blocks the control circuit 11 by lowering the supply voltage V CC under UVLO.
  • the supply voltage V CC is additionally connected via an optional resistor R7 to a controllable switch 34 which is connected to ground 4.
  • the switch 34 is not a switch in the binary sense, but has a non-conductive state in which the current path from the resistor R7 to ground 4 is blocked, and a further state in which a certain current flow is permitted, the internal resistance of the switch 34 here can still have a relatively large value.
  • the switch 34 is formed by a circuit, the main part of which is a pnp transistor T3. Its emitter is connected to resistor R7 and its collector is connected to ground 4. Its base is connected to ground via a resistor R8 and a capacitor C7. Resistor R8 forms a base series resistor that sets a base current that is dimensioned such that the resulting emitter current is greater than the current supplied by resistor R1 and received by switch 32.
  • the base of transistor T3 is connected via a protective diode D3 to a current sensing path 35, which contains a resistor R9 and leads to terminal 24. From this the current sensing path goes via the helix 25 to the intermediate circuit voltage.
  • the transistor T3 receives base current via the resistor R8.
  • the transistor T3 becomes conductive to such an extent that it can take over the current supplied by R1 via the resistor R7. If, however, a gas discharge lamp 2 is inserted into the socket, the potential at the base of the transistor T3 increases to such an extent that the latter supplies a voltage at its emitter that is greater than the supply voltage V CC , with which the switch 34 does not conduct, ie is open .
  • the supply voltage V CC for the control circuit 11 is at a voltage which exceeds the threshold value UVLO.
  • the inverter half bridge 6 provides an AC voltage with which the low-pressure gas discharge lamp 2 is ignited and operated.
  • the voltage monitoring circuit 27 detects a voltage that is lower than a predetermined maximum value. Consequently, the voltage present at the control input 31 of the switch 32 does not exceed an ignition voltage which is required to switch the switch 32 with a low resistance.
  • the low-pressure gas discharge lamp 2 shows a fault which causes the operating voltage to rise inadmissibly, this is detected by the voltage monitoring circuit 27 and the switch 32 is ignited by a signal at its control input 31.
  • Ballast 1 is only that instead of the low pressure gas discharge lamp 2, two in Series of gas discharge lamps 2a, 2b provided are. Their interconnected coils 22a, 25b via a transformer or transformer M, heated, which is connected in series with the resonance capacitor C5 is. In addition, the current sensing path 35 leads over the winding of the transformer M with the resonance capacitor C5 is connected in series. Around the high-resistance current sensing path to close, the capacitor C5 is a resistor R10 connected in parallel, like all resistors, the higher Voltage differences are exposed in practice formed by a series connection of individual resistors is.
  • a control circuit 11 which requires its own supply voltage, is provided to control an inverter half bridge 6.
  • the control circuit 11 is designed such that it blocks the inverter half bridge 6 when the supply voltage V CC falls below a threshold value UVLO.
  • a voltage monitoring circuit 27 pulls the supply voltage V CC below the threshold value UVLO via a self-holding controllable electronic switch 32 and a Zener diode DZ2 if an excessively high lamp voltage is detected. The ballast is therefore inactive.
  • a current sensing path 35 which leads over at least one filament of the low-pressure gas discharge lamp 2, is used to detect a lamp change.
  • the current sensing path controls a further electronic switch 34, which is also connected to the supply voltage V CC of the control circuit 11 and, if it conducts, can draw further to ground than the first switch 32.
  • the second electronic switch 34 connected to the current sensing path 35 thus enables the ballast 1 to restart automatically after changing the lamp, by initially lowering the supply voltage V CC below the value specified by the first switch 32 to bring it back into a non-conductive state.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)
EP98106202A 1997-04-12 1998-04-04 Ballast à réamorçage automatique Expired - Lifetime EP0871347B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19715341 1997-04-12
DE19715341A DE19715341C1 (de) 1997-04-12 1997-04-12 Elektronisches Vorschaltgerät mit automatischem Wiederanlauf

Publications (2)

Publication Number Publication Date
EP0871347A1 true EP0871347A1 (fr) 1998-10-14
EP0871347B1 EP0871347B1 (fr) 2000-06-21

Family

ID=7826352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98106202A Expired - Lifetime EP0871347B1 (fr) 1997-04-12 1998-04-04 Ballast à réamorçage automatique

Country Status (8)

Country Link
US (1) US6043612A (fr)
EP (1) EP0871347B1 (fr)
AT (1) ATE194051T1 (fr)
DE (2) DE19715341C1 (fr)
DK (1) DK0871347T3 (fr)
ES (1) ES2147036T3 (fr)
GR (1) GR3033943T3 (fr)
PT (1) PT871347E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069986A1 (fr) * 2000-03-17 2001-09-20 Trilux-Lenze Gmbh + Co. Kg. Procede et montage permettant de produire une tension d'allumage pour des lampes fluorescentes

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850441A1 (de) * 1998-10-27 2000-05-11 Trilux Lenze Gmbh & Co Kg Verfahren und Vorschaltgerät zum Betrieb einer mit einer Leuchtstofflampe versehenen Leuchte
US6362575B1 (en) * 2000-11-16 2002-03-26 Philips Electronics North America Corporation Voltage regulated electronic ballast for multiple discharge lamps
DE10255737A1 (de) * 2002-11-28 2004-06-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zum Betrieb mindestens einer Niederdruckentladungslampe und Betriebsgerät für mindestens eine Niederdruckentladungslampe
DE102004037390B4 (de) * 2004-08-02 2008-10-23 Infineon Technologies Ag Ansteuerschaltung für eine Leuchtstofflampe mit einer Diagnoseschaltung und Verfahren zur Diagnose einer Leuchtstofflampe
US7768755B1 (en) 2007-12-04 2010-08-03 Universal Lighting Technologies, Inc. Over-voltage protection and automatic re-strike circuit for an electronic ballast
US8008873B2 (en) * 2009-05-28 2011-08-30 Osram Sylvania Inc. Restart circuit for multiple lamp electronic ballast
GB201101517D0 (en) * 2011-01-28 2011-03-16 Proximagen Ltd Receptor antagonists

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0285049A1 (fr) * 1987-03-28 1988-10-05 ABB CEAG Licht- und Stromversorgungstechnik GmbH Dispositif pour l'ignition et le fonctionnement d'une lampe fluorescente
DE4243955A1 (de) * 1992-12-23 1994-06-30 Tridonic Bauelemente Ges Mbh D Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar
US5422548A (en) * 1992-09-16 1995-06-06 Koito Manufacturing Co., Ltd. Cut-off vehicular discharge lamp circuit having wait and monitor modes
EP0687135A2 (fr) * 1994-06-09 1995-12-13 ARS S.p.A. Appareil pour réguler la tension d'alimentation destinée à des lampes à décharge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608615A1 (de) * 1986-03-14 1987-09-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb von niederdruckentladungslampen
US5315214A (en) * 1992-06-10 1994-05-24 Metcal, Inc. Dimmable high power factor high-efficiency electronic ballast controller integrated circuit with automatic ambient over-temperature shutdown
DE4410492A1 (de) * 1994-03-25 1995-09-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen
TW266383B (en) * 1994-07-19 1995-12-21 Siemens Ag Method of starting at least one fluorescent lamp by an electronic ballast and the electronic ballast used therefor
DE19505460A1 (de) * 1995-02-17 1996-08-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer Entladungslampe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0285049A1 (fr) * 1987-03-28 1988-10-05 ABB CEAG Licht- und Stromversorgungstechnik GmbH Dispositif pour l'ignition et le fonctionnement d'une lampe fluorescente
US5422548A (en) * 1992-09-16 1995-06-06 Koito Manufacturing Co., Ltd. Cut-off vehicular discharge lamp circuit having wait and monitor modes
DE4243955A1 (de) * 1992-12-23 1994-06-30 Tridonic Bauelemente Ges Mbh D Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar
EP0687135A2 (fr) * 1994-06-09 1995-12-13 ARS S.p.A. Appareil pour réguler la tension d'alimentation destinée à des lampes à décharge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069986A1 (fr) * 2000-03-17 2001-09-20 Trilux-Lenze Gmbh + Co. Kg. Procede et montage permettant de produire une tension d'allumage pour des lampes fluorescentes

Also Published As

Publication number Publication date
ES2147036T3 (es) 2000-08-16
DE59800177D1 (de) 2000-07-27
EP0871347B1 (fr) 2000-06-21
US6043612A (en) 2000-03-28
DE19715341C1 (de) 1998-10-15
GR3033943T3 (en) 2000-11-30
PT871347E (pt) 2000-12-29
ATE194051T1 (de) 2000-07-15
DK0871347T3 (da) 2000-10-02

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