EP0808084B1 - Sicherheitsabschaltung bei asymmetrischer Lampenleistung - Google Patents
Sicherheitsabschaltung bei asymmetrischer Lampenleistung Download PDFInfo
- Publication number
- EP0808084B1 EP0808084B1 EP97107206A EP97107206A EP0808084B1 EP 0808084 B1 EP0808084 B1 EP 0808084B1 EP 97107206 A EP97107206 A EP 97107206A EP 97107206 A EP97107206 A EP 97107206A EP 0808084 B1 EP0808084 B1 EP 0808084B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- voltage
- lamp
- coupling capacitor
- threshold value
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 25
- 238000010168 coupling process Methods 0.000 claims description 25
- 238000005859 coupling reaction Methods 0.000 claims description 25
- 230000001960 triggered effect Effects 0.000 claims description 9
- 239000000470 constituent Substances 0.000 claims 1
- 230000006378 damage Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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
Definitions
- the present invention relates to a circuit for safety shutdown an AC operating circuit for discharge lamps, in particular low-pressure discharge lamps according to the preamble of Claim 1.
- operating circuits for several lamps are also meant, that is operating circuits for at least one lamp.
- Discharge lamps come with AC power operated, usually with a high frequency power.
- For DC decoupling one is connected in series with the lamp Coupling capacitor used.
- C. H. Sturm and E. Klein Ole. Klein "Operating Devices and Circuits for Electric Lamps", 6. Edition 1992, Siemens AG.
- Circuits with safety shutdown devices that are based on the Address lamp voltage, that is to say on the discharge path of the lamp falling voltage.
- the invention accordingly starts from one Circuit for AC operation of a discharge lamp via a Coupling capacitor connected in series with the lamp for DC isolation with a safety shutdown device as used in ballasts OSRAM QTEC are known.
- EP-A-696 157 describes a circuit for AC operation of a discharge lamp described with a safety shutdown on a DC voltage at the coupling capacitor through a through the lamp flowing DC component responds.
- the electronic ballast includes AC operation of a discharge lamp, a safety shutdown, the am by a direct current component flowing through the lamp Coupling capacitor is triggered.
- the object of the invention is to improve the circuit in such a way that that the threshold switching of the safety shutdown in addition to the DC voltage at the coupling capacitor also to an excessive DC link voltage the operating circuit responds.
- the same threshold switching the lamp voltage is also monitored, i.e. the threshold switching is also triggered by an excessive lamp voltage.
- This can be done by connecting a fraction of the lamp voltage to one Part of the voltage divider circuit is applied by a circuit that is designed so that the lamp voltage fraction of the applied Fraction of the intermediate circuit voltage superimposed.
- a connection point of the voltage divider circuit via a Trigger diode connected to a suitable point of the threshold circuit be so that the threshold switching on both Polarities of the DC voltage responds.
- An embodiment of the circuit according to the invention provides before, the connection point of the trigger diode or a potential adjacent connection point via a lamp filament to connect to the voltage divider circuit and between this connection point of the trigger diode or a potential adjacent connection point and one of the poles of the DC link voltage as the base potential of the safety shutdown device or another suitable base potential to switch a resistor.
- This resistance is so dimensioned so that when the lamp is removed from its socket or if the lamp filament breaks, the potential of the named Connection point to the potential or so far in the direction pulls to the potential of the pole so that the threshold circuit is triggered via the trigger diode.
- the threshold circuit is a bistable multivibrator, such as a thyristor equivalent circuit with two transistors.
- a discharge lamp is powered by a push-pull frequency generator operated with two transistors. Then can the safety shutdown device be constructed so that after their response via a shutdown transistor Control of one of the two transistors suppressed, for example the base of a bipolar transistor with low resistance to ground connects.
- Fig. 1 there is an upper one in the double-lined frame Part RE1, RE2 of a voltage divider circuit RE1, RE2, R1 shown, the resistor RE1, a coupling capacitor C3 with a falling DC voltage UC3 in the event of a fault is connected in parallel.
- RE1 is clear greater than the AC resistance of C3 at the operating frequency the lamp.
- the voltage Umeß falling across the resistor R1 is when a threshold voltage UZ of a Zener diode is exceeded DZ1 a connection point of a bistable multivibrator in the form of a thyristor equivalent circuit of two Bipolar transistors supplied.
- This toggle switch has one stable state in which both transistors are conducting, and another stable state in which both transistors do not lead.
- the output signal line is drawn the base of an NPN turn-off transistor, not shown controlled so that it becomes conductive and the Base of a transistor, also not shown, the Lamp operating push-pull frequency generator with low resistance shorts to ground.
- the flip-flop on the emitter side of the top Transistors supplied with voltage in a suitable manner, so that a separate power supply is unnecessary.
- the circuit shown in Fig. 2 corresponds to that just described except for the double-framed additional Trigger diode D3 between the base of the upper transistor the flip-flop and a connection point between the resistor RE2 and the coupling capacitor C3 or here the Lamp filament.
- the reason for the trigger diode is that the voltage divider circuit only one opposite the intermediate circuit voltage E. Charging or voltage UC3 on the coupling capacitor C3 into a trigger signal through the Zener diode DZ1 implemented because only then the measuring voltage Umeß increases becomes. With opposite charging of the coupling capacitor C3 the potential at the upper connection point drops the trigger diode D3, so that this then the potential at the Pull down the base of the upper flip-flop transistor and thus trigger the flip-flop in the conductive state can.
- FIG. 3 shows the same circuit as FIG. 2, but additionally with a resistor R3 connected between the upper connection point of the trigger diode D3 and the lower pole of the intermediate circuit voltage E, here a "pulldown resistor".
- R3 connected between the upper connection point of the trigger diode D3 and the lower pole of the intermediate circuit voltage E, here a "pulldown resistor”.
- This is dimensioned such that it pulls the potential of its upper connection point in the direction of the potential of the lower pole of the intermediate circuit voltage E in the absence of a lamp, filament breakage or the like, ie it is significantly lower-impedance than RE2.
- the flip-flop is triggered via the trigger diode D3 even if the filament breaks or the lamp is removed.
- the last-described function of the circuit from FIG. 3 is particularly practical when a lamp, for example in a larger lighting system with many lamps, removed shall be. Then there is no need to switch off the whole lighting system, so that faster and with normal lighting can be worked.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
- Fig. 1
- das erste Ausführungsbeispiel,
- Fig. 2
- das zweite Ausführungsbeispiel und
- Fig. 3
- das dritte Ausführungsbeispiel der Erfindung.
Claims (8)
- Schaltung zur Sicherheitsabschaltung einer Wechselspannungsbetriebsschaltung für Entladungslampen, wobei die Schaltungdadurch gekennzeichnet, daßeinen Kopplungskondensator (C3), der Bestandteil des Lampenkreises der Wechselspannungsbetriebsschaltung ist und dort gleichzeitig zur Gleichstromtrennung dient, undeine Sicherheitsabschalteinrichtung mit einer Schwellenwertschaltung, die durch eine bestimmte Gleichspannung (UC3) am Kopplungskondensator (C3) getriggert wird, aufweist,die Schwellenwertschaltung zusätzlich durch eine überhöhte Zwischenkreisspannung (E) getriggert wird,ein über eine Spannungsteilerschaltung (RE1, RE2, R1) erhaltener Bruchteil der Zwischenkreisspannung (E) an der Schwellenwertschaltung anliegt,der Kopplungskondensator (C3) einem Teil (RE1) der Spannungsteilerschaltung (RE1, RE2, R1) parallelgeschaltet istzwischen den Teil (RE1) der Spannungsteilerschaltung (RE1, RE2, R1), dem der Kopplungskondensator (C3) parallelgeschaltet ist, und den Rest der Spannungsteilerschaltung (RE2, R1) eine Elektrode der Lampe geschaltet ist, undder Widerstand des Teils (RE1) der Spannungsteilerschaltung (RE1, RE2, R1), dem der Kopplungskondensator (C3) parallel geschaltet ist, deutlich größer ist als der Wechselstromwiderstand des Kopplungskondensator (C3) bei der Betriebsfrequenz der Wechselspannungsbetriebsschaltung für die Lampe.
- Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Schwellenwertschaltung auch durch eine überhöhte Lampenspannung (UL) getriggert wird.
- Schaltung nach Anspruch 2, dadurch gekennzeichnet, daß ein Bruchteil der Lampenspannung (UL) an einen Teil der Spannungsteilerschaltung (RE1, RE2, R1) derart angelegt wird, daß er sich dem angelegten Bruchteil der Zwischenkreisspannung (E) überlagert.
- Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß ein Anschlußpunkt der Spannungsteilerschaltung (RE1, RE2, R1) derart über eine Triggerdiode (D3) mit der Schwellenwertschaltung verbunden ist, daß die Schwellenwertschaltung durch Gleichspannungen (UC3) beider Polaritäten am Kopplungskondensator (C3) getriggert wird.
- Schaltung nach Anspruch 4, dadurch gekennzeichnet, daß der Anschlußpunkt der Triggerdiode (D3) oder ein potentialmäßig benachbarter Anschlußpunkt über eine Lampenwendel mit der Spannungsteilerschaltung verbunden ist und zwischen den Anschlußpunkt der Triggerdiode (D3) oder einen potentialmäßig benachbarten Anschlußpunkt und einen der Pole der Zwischenkreisspannung (E) oder ein anderes geeignetes Basispotential ein Widerstand (R3) geschaltet ist, der dazu ausgelegt ist, bei Entnahme der Lampe oder Lampenwendelbruch das Potential des Anschlußpunktes in Richtung auf das Potential des Pols oder auf das Basispotential zu ziehen, um über die Triggerdiode (D3) die Schwellenwertschaltung zu triggem.
- Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Schwellenwertschaltung eine bistabile Kippschaltung ist.
- Schaltung nach Anspruch 6, dadurch gekennzeichnet, daß die bistabile Kippschaltung eine Thyristorersatzschaltung mit zwei Transistoren ist.
- Schaltung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Lampe über einen Gegentaktfrequenzgenerator mit zwei Transistoren betrieben wird und die Sicherheitsabschalteinrichtung nach ihrem Ansprechen über einen Abschalttransistor die Ansteuerung eines der beiden Transistoren unterdrückt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19619580 | 1996-05-15 | ||
| DE19619580A DE19619580A1 (de) | 1996-05-15 | 1996-05-15 | Sicherheitsabschaltung bei asymmetrischer Lampenleistung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0808084A2 EP0808084A2 (de) | 1997-11-19 |
| EP0808084A3 EP0808084A3 (de) | 1998-04-22 |
| EP0808084B1 true EP0808084B1 (de) | 2001-06-27 |
Family
ID=7794387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97107206A Expired - Lifetime EP0808084B1 (de) | 1996-05-15 | 1997-04-30 | Sicherheitsabschaltung bei asymmetrischer Lampenleistung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5939832A (de) |
| EP (1) | EP0808084B1 (de) |
| CA (1) | CA2205323C (de) |
| DE (2) | DE19619580A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19941437A1 (de) | 1999-08-30 | 2001-03-01 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe |
| DE10046443A1 (de) * | 2000-09-18 | 2002-03-28 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Elektronische Schaltung zur Detektion des Wandelbruchs bei Gasentladungslampen |
| WO2003041457A1 (en) * | 2001-11-07 | 2003-05-15 | Koninklijke Philips Electronics N.V. | Ballast circuit arrangement for operating a discharge lamp with end of lamp life detection |
| DE10163033A1 (de) * | 2001-12-20 | 2003-07-03 | Tridonicatco Gmbh & Co Kg | Elektronisches Vorschaltgerät mit Überwachungsschaltung zum Erkennen des in einer Gasentladungslampe auftretenden Gleichrichteffekts |
| DE102005028419A1 (de) * | 2005-06-20 | 2006-12-28 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Abschaltschaltung |
| CN101060737A (zh) * | 2006-04-19 | 2007-10-24 | 皇家飞利浦电子股份有限公司 | 一种探测灯的功能状态的电路和镇流器 |
| US8482213B1 (en) | 2009-06-29 | 2013-07-09 | Panasonic Corporation | Electronic ballast with pulse detection circuit for lamp end of life and output short protection |
| US8947020B1 (en) | 2011-11-17 | 2015-02-03 | Universal Lighting Technologies, Inc. | End of life control for parallel lamp ballast |
| CN202455166U (zh) * | 2011-12-31 | 2012-09-26 | 东莞市洁德电子科技有限公司 | 感应装置、感应充电器和感应应急灯 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57110084A (en) * | 1980-12-26 | 1982-07-08 | Toshiba Electric Equip Corp | Transistor inverter |
| US5023516A (en) * | 1988-05-10 | 1991-06-11 | Matsushita Electric Industrial Co., Ltd. | Discharge lamp operation apparatus |
| DE3925899A1 (de) * | 1989-08-04 | 1991-02-07 | Zumtobel Ag | Elektronisches vorschaltgeraet fuer gasentladungslampen |
| DE4100349C2 (de) * | 1990-01-31 | 1994-04-28 | Siemens Ag | Elektronisches Vorschaltgerät |
| US5387846A (en) * | 1991-11-27 | 1995-02-07 | Selwyn Yuen | Combination ballast for driving a fluorescent lamp or tube and ballast protection circuit |
| US5475284A (en) * | 1994-05-03 | 1995-12-12 | Osram Sylvania Inc. | Ballast containing circuit for measuring increase in DC voltage component |
| US5528147A (en) * | 1994-06-30 | 1996-06-18 | Motorola Lighting, Inc. | Apparatus for detecting gas discharge lamp faults |
| US5574335A (en) * | 1994-08-02 | 1996-11-12 | Osram Sylvania Inc. | Ballast containing protection circuit for detecting rectification of arc discharge lamp |
-
1996
- 1996-05-15 DE DE19619580A patent/DE19619580A1/de not_active Withdrawn
-
1997
- 1997-04-30 DE DE59703889T patent/DE59703889D1/de not_active Expired - Lifetime
- 1997-04-30 EP EP97107206A patent/EP0808084B1/de not_active Expired - Lifetime
- 1997-05-09 US US08/853,996 patent/US5939832A/en not_active Expired - Lifetime
- 1997-05-14 CA CA002205323A patent/CA2205323C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2205323A1 (en) | 1997-11-15 |
| EP0808084A2 (de) | 1997-11-19 |
| DE59703889D1 (de) | 2001-08-02 |
| US5939832A (en) | 1999-08-17 |
| CA2205323C (en) | 2005-03-22 |
| EP0808084A3 (de) | 1998-04-22 |
| DE19619580A1 (de) | 1997-11-20 |
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