EP1081988A2 - Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe - Google Patents
Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe Download PDFInfo
- Publication number
- EP1081988A2 EP1081988A2 EP00116153A EP00116153A EP1081988A2 EP 1081988 A2 EP1081988 A2 EP 1081988A2 EP 00116153 A EP00116153 A EP 00116153A EP 00116153 A EP00116153 A EP 00116153A EP 1081988 A2 EP1081988 A2 EP 1081988A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- threshold switch
- circuit arrangement
- voltage
- bridge
- 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
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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
- Y10S315/02—High frequency starting operation for fluorescent lamp
-
- 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
- Y10S315/05—Starting and operating circuit for fluorescent lamp
Definitions
- the invention relates to a circuit arrangement for operating at least one discharge lamp according to the preamble of claim 1.
- Such a circuit arrangement is for example in the German patent application DE 196 19 580 discloses.
- This document describes a safety shutdown device for a half-bridge inverter, which the occurrence of a Rectification effect detected in the discharge lamp and the half-bridge inverter switches off in this case.
- the safety shutdown device is designed such that it was caused by a DC component of the lamp current DC voltage on the half-bridge capacitor responds.
- the appearance of a pronounced rectification effect in the discharge lamp marks the end of the service life of the discharge lamp and caused on the half-bridge capacitor one that deviates from the setpoint - that is, from half the DC link voltage Voltage drop.
- This comparatively complex safety shutdown device comprises a threshold switch and a bistable multivibrator, by means of which withdraws the control signal from a half-bridge inverter transistor can be.
- the invention has Circuit arrangement a first and a second RC element, the are interconnected by a threshold switch, and means for detection the switching state of the threshold switch.
- the first RC link is to the Center tap of the half-bridge inverter and the second RC element is connected to the Half-bridge capacitor connected.
- This forms the capacitor on the first RC element from a DC voltage that is half the DC link voltage, that means half of the supply voltage of the half-bridge inverter, while a DC voltage is present on the capacitor of the second RC element trains, which corresponds to the voltage drop across the half-bridge capacitor.
- the High-frequency voltage components are generated by the second RC element from the half-bridge capacitor voltage filtered out.
- the switching state of the Threshold switch or the current flow between the capacitors of the two RC elements are from the control device of the half-bridge inverter detected by suitable means to the half-bridge inverter in the event of a fault to be able to switch off.
- the circuit arrangement according to the invention advantageously has a parallel connection to the threshold switch arranged ohmic resistance, which with the resistors of the first and second RC elements forms a voltage divider. With help this additional resistance can be achieved by suitable dimensioning of the aforementioned Resistors the switching threshold of the monitoring circuit according to the invention to any voltage value above the threshold voltage of the Threshold switch can be set.
- the invention Circuit arrangement advantageously a parallel to the threshold switch arranged capacitor on the threshold switch after switching on lasts long enough in the conductive state to balance the charges to ensure the capacitors of the first and second RC elements.
- a diac is advantageously used as the threshold switch, since it switches to positive as well as reacting to negative tensions.
- the switching status of the threshold switch the monitoring circuit according to the invention advantageously has to detect another ohmic resistance, of which the different Balancing charges of the capacitors of the two RC elements Current flows through.
- This resistor is advantageously a rectifier upstream, so that the aforementioned equalizing current between the capacitors the RC elements on the resistor generate unipolar voltage pulses, their polarity is independent of the current direction of the compensating current.
- This unipolar Voltage pulses can come from the monitor input of an integrated circuit can be used to switch off the half-bridge inverter.
- the monitoring circuit according to the invention can advantageously be for externally controlled Half-bridge inverters can be used. It is also characterized by this from the fact that it is not susceptible to interference because, except for that of the equalizing current flowed through resistance all components of the invention Monitoring circuit arranged in the high voltage part of the circuit arrangement and the signal line from the rectifier to that of the compensating current flowed through resistance is completed by this low resistance.
- the invention based on a preferred embodiment explained in more detail.
- the figure shows a schematic representation of the circuit arrangement according to the preferred embodiment.
- the circuit arrangement is an externally controlled half-bridge inverter for high-frequency Operation of a fluorescent lamp LP.
- the half-bridge inverter has two alternating switching field effect transistors T1, T2 and a control device A for these transistors T1, T2.
- the control device A is partially as Integrated circuit IC, in particular designed as a high-voltage IC.
- the DC voltage supply of the half-bridge inverter is carried out in the usual way Rectification obtained from the AC mains voltage.
- Between the center tap M of the half-bridge inverter and the tap V1 on the half-bridge capacitor CK is arranged as a series resonant circuit load circuit essentially formed by the lamp inductor LD and the ignition capacitor CR becomes.
- the load circuit has two pairs of electrical connections j1, j2 for the electrode filaments E1, E2 of a fluorescent lamp LP.
- the fluorescent lamp LP is connected in parallel to the ignition capacitor CR.
- the circuit arrangement can the circuit arrangement a heater (not shown) for preheating the Have electrode filaments E1, E2 of the fluorescent lamp LP.
- the circuit arrangement is also equipped with a monitoring circuit, which is a first RC element R1, C1 and a second RC element R2, C2 and a diac DC.
- the first RC element R1, C1 is at the center tap M of the half-bridge inverter connected, while the second RC element R2, C2 to the tap V2 of the half-bridge capacitor CK is connected.
- the capacitors C1, C2 of both RC elements R1, C1, R2, C2 are connected to each other by the diac DC.
- Parallel an ohmic resistor R3 is connected to the diac DC, which is connected to the resistors R1, R2 of the RC elements forms a voltage divider.
- the monitoring circuit parallel to the diac DC and parallel to the resistor R3 a capacitor C3 on, the diac DC longer in the conductive after its switching Condition holds.
- the ground connections of the capacitors C1, C2 are with a rectifier consisting of four diodes D1, D2, D3, D4.
- the DC voltage output of the rectifier D1, D2, D3, D4 is via a low impedance Resistor R4 connected to ground.
- the voltage drop across the resistor R4 is through a connecting line between the resistor R4 and a Monitor input of the integrated circuit IC from the control device A of the half-bridge inverter is monitored.
- the half-bridge capacitor CK charged so that the tap V1 is at an electrical potential, that corresponds to half the supply voltage of the half-bridge inverter. Due to the alternating switching transistors T1, T2 of the half-bridge inverter the load circuit with a high-frequency alternating voltage between approx. 30-50 KHz applied.
- the capacitors C1 and C2 of the two RC elements R1, C1 and R2, C2 are charged so that a DC voltage is applied to them equal to half the intermediate circuit voltage, that is to say equal to half the supply voltage of the half-bridge inverter.
- the high-frequency AC components are filtered out by the capacitors C1, C2.
- the electrode coils E1, E2 Fluorescent lamp can be preheated.
- the ignition capacitor CR is used to ignite a gas discharge in the Fluorescent lamp LP required ignition voltage provided.
- the ignition capacitor CR is bridged by the discharge gap.
- a high-frequency alternating current flows through the fluorescent lamp LP is regulated to a constant level by the half-bridge inverter.
- the lamp current is symmetrical with respect to both half-periods of the high-frequency AC voltage, so that the potential at tap V1 remains unchanged corresponds to half the supply voltage of the half-bridge inverter.
- resistance R3 is therefore normally no voltage drop or at least no significant drop in voltage measurable, the state of charge of the capacitors C1, C2 is approximately the same and the diac DC is locked.
- the diac DC is switched to the conductive state again and finds it again a charge equalization between the capacitors C1, C2 instead.
- This process repeats itself periodically.
- the time interval between the charge balancing described above of the capacitors and thus also the time interval between The current pulses through the diac DC depend on the strength of the rectifying effect from. The greater this potential difference, the shorter the time interval between the current impulses. In other words, the more the voltage across the half-bridge capacitor CK deviates from half the DC link voltage, all the more The current pulses occur at shorter intervals.
- the low resistance R4 and the bridge rectifier D1, D2, D3, D4 convert the charge equalization current impulses between the capacitors C1, C2 into unipolar Voltage pulses of positive polarity. These generated at resistor R4 Voltage pulses are a monitor input of the integrated circuit IC supplied to the control device A of the half-bridge inverter.
- the control device A is programmed to be the half-bridge inverter switches off after detection of an input voltage at the aforementioned monitor input.
- Table I gives a dimensioning of the components of the monitoring device of the circuit arrangement according to the invention, which are necessary for the operation of one or more fluorescent lamps connected in series and for a lamp current of 170 mA is suitable.
- the monitoring device according to the invention can also be used in circuit arrangements which are used to operate a plurality of discharge lamps connected in series or in parallel.
- the circuit arrangement according to the invention is not only suitable for operating fluorescent lamps, but can generally be used for operating low-pressure discharge lamps.
- the monitoring device according to the invention can be used not only with externally controlled half-bridge inverters, but also with freely oscillating half-bridge inverters.
- the control device A of the half-bridge inverter can also be designed so that it responds in a suitable manner to the voltage pulses across the resistor R4.
- control device A can be designed such that it only switches off the half-bridge inverter from a certain, predetermined pulse frequency of the voltage pulses detected at the resistor R4.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Dimensionierung der Bauteile der erfindungsgemäßen Überwachungsvorrichtung für eine Schaltungsanordnung, die den Lampenstrom auf einen Wert von 170 mA regelt | |
R1, R2 | 100 kΩ, 10%, 500 V |
R3 | 390 kΩ, 5% |
R4 | 150 Ω |
C1, C2 | 10 nF, 250 V, RM 7,5 |
C3 | 47 nF, 50 V |
D1, D2, D3, D4 | Diode-SMD, 75 V-150mA SOD80 |
DC | Diac, 32 V |
Claims (7)
- Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe, wobei die Schaltungsanordnung folgende Merkmale aufweist,einen Halbbrückenwechselrichter (T1, T2, A) mit einer Ansteuerungsvorrichtung (A) und mit einem nachgeschalteten Lastkreis (LD, CR, j1, j2),mindestens einen Halbbrückenkondensator (CK), der mit dem Lastkreis und mit dem Halbbrückenwechselrichter verbunden ist,der Lastkreis (LD, CR, j1, j2) elektrische Anschlüsse (j1, j2) für mindestens eine Entladungslampe (LP) aufweist,Mittel zur Überwachung des Spannungsabfalls an dem mindestens einen Halbbrückenkondensator (CK),
dadurch gekennzeichnet, daß die Mittel zur Überwachung des Spannungsabfalls am Halbbrückenkondensator (CK)ein erstes (R1, C1) und ein zweites RC-Glied (R2, C2) aufweisen, die durch einen Schwellwertschalter (DC) miteinander verbunden sind,das erste RC-Glied (R1, C1) an den Mittenabgriff (M) des Halbbrückenwechselrichters (T1, T2, A) angeschlossen ist,das zweite RC-Glied (R2, C2) an den Halbbrückenkondensator (CK) angeschlossen ist undMittel zur Detektion des Schaltzustandes des Schwellwertschalters (DC) aufweisen. - Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zur Detektion des Schaltzustandes des Schwellwertschalters (DC) einen ohmschen Widerstand (R4) aufweisen, der den Stromfluß durch den Schwellwertschalter (DC) detektiert.
- Schaltungsanordnung nach Anspruch 2, dadurch gekennzeichnet, daß dem ohmschen Widerstand (R4) ein Gleichrichter (D1-D4) vorgeschaltet ist.
- Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß parallel zum Schwellwertschalter (DC) ein ohmscher Widerstand (R3) geschaltet ist, der mit den Widerständen (R1, R2) des ersten (R1, C1) und zweiten RC-Gliedes (R2, C2) einen Spannungsteiler bildet.
- Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß parallel zum Schwellwertschalter (DC) ein Kondensator (C3) geschaltet ist.
- Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Schwellwertschalter (DC) ein Diac ist.
- Schaltungsanordnung nach Anspruch 3, dadurch gekennzeichnet, daß die Ansteuerungsvorrichtung (A) des Halbbrückenwechselrichters (T1, T2, A) einen Integrierten Schaltkreis (IC) mit einem Monitoreingang aufweist, wobei der Monitoreingang mit dem den Stromfluß durch den Schwellwertschalter (DC) detektierenden ohmschen Widerstand (R4) verbunden ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19941437A DE19941437A1 (de) | 1999-08-30 | 1999-08-30 | Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe |
DE19941437 | 1999-08-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1081988A2 true EP1081988A2 (de) | 2001-03-07 |
EP1081988A3 EP1081988A3 (de) | 2002-09-11 |
EP1081988B1 EP1081988B1 (de) | 2004-10-27 |
Family
ID=7920277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000116153 Expired - Lifetime EP1081988B1 (de) | 1999-08-30 | 2000-08-01 | Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe |
Country Status (6)
Country | Link |
---|---|
US (1) | US6291947B1 (de) |
EP (1) | EP1081988B1 (de) |
JP (1) | JP2001102192A (de) |
AT (1) | ATE281057T1 (de) |
CA (1) | CA2317310A1 (de) |
DE (2) | DE19941437A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202005013754U1 (de) * | 2005-08-31 | 2005-11-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Vorschaltgerät für eine Entladungslampe mit adaptiver Vorheizung |
EP2742574B1 (de) * | 2011-08-12 | 2018-12-19 | Koninklijke Philips N.V. | Universeller spannungswandler und induktive energiekupplung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997043879A1 (en) * | 1996-05-10 | 1997-11-20 | Philips Electronics N.V. | Power supply for feeding and igniting a gas discharge lamp |
EP0886460A1 (de) * | 1997-06-18 | 1998-12-23 | Oy Helvar | Elektronisches Vorschaltgerät mit Detektionsschaltkreis für die Lampenstrom-Gleichrichtung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4406083A1 (de) * | 1994-02-24 | 1995-08-31 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe |
US5677602A (en) * | 1995-05-26 | 1997-10-14 | Paul; Jon D. | High efficiency electronic ballast for high intensity discharge lamps |
DE19619580A1 (de) | 1996-05-15 | 1997-11-20 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Sicherheitsabschaltung bei asymmetrischer Lampenleistung |
US5994847A (en) * | 1997-01-31 | 1999-11-30 | Motorola Inc. | Electronic ballast with lamp current valley-fill power factor correction |
US6177768B1 (en) * | 1997-04-17 | 2001-01-23 | Toshiba Lighting & Technology Corp. | Discharge lamp lighting device and illumination device |
US5770925A (en) * | 1997-05-30 | 1998-06-23 | Motorola Inc. | Electronic ballast with inverter protection and relamping circuits |
US5869937A (en) * | 1997-12-17 | 1999-02-09 | Motorola Inc. | High efficiency electronic ballast |
-
1999
- 1999-08-30 DE DE19941437A patent/DE19941437A1/de not_active Withdrawn
-
2000
- 2000-08-01 AT AT00116153T patent/ATE281057T1/de not_active IP Right Cessation
- 2000-08-01 EP EP20000116153 patent/EP1081988B1/de not_active Expired - Lifetime
- 2000-08-01 DE DE50008397T patent/DE50008397D1/de not_active Expired - Lifetime
- 2000-08-23 US US09/644,041 patent/US6291947B1/en not_active Expired - Lifetime
- 2000-08-28 JP JP2000256615A patent/JP2001102192A/ja active Pending
- 2000-08-29 CA CA002317310A patent/CA2317310A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997043879A1 (en) * | 1996-05-10 | 1997-11-20 | Philips Electronics N.V. | Power supply for feeding and igniting a gas discharge lamp |
EP0886460A1 (de) * | 1997-06-18 | 1998-12-23 | Oy Helvar | Elektronisches Vorschaltgerät mit Detektionsschaltkreis für die Lampenstrom-Gleichrichtung |
Also Published As
Publication number | Publication date |
---|---|
JP2001102192A (ja) | 2001-04-13 |
EP1081988B1 (de) | 2004-10-27 |
CA2317310A1 (en) | 2001-02-28 |
DE19941437A1 (de) | 2001-03-01 |
US6291947B1 (en) | 2001-09-18 |
DE50008397D1 (de) | 2004-12-02 |
EP1081988A3 (de) | 2002-09-11 |
ATE281057T1 (de) | 2004-11-15 |
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