EP1943886B1 - Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method - Google Patents
Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method Download PDFInfo
- Publication number
- EP1943886B1 EP1943886B1 EP06807557A EP06807557A EP1943886B1 EP 1943886 B1 EP1943886 B1 EP 1943886B1 EP 06807557 A EP06807557 A EP 06807557A EP 06807557 A EP06807557 A EP 06807557A EP 1943886 B1 EP1943886 B1 EP 1943886B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inverter
- frequency
- voltage
- heating transformer
- electronic ballast
- 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.)
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- 238000010438 heat treatment Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
Definitions
- the present invention relates to a drive circuit for a switchable heating transformer of an electronic ballast having a circuit input terminal for receiving an oscillating inverter voltage (DC / AC converter) having a variable inverter frequency, and a switching device, at the output terminal of the heating transformer is clamped. Moreover, the present invention relates to a corresponding method for switching a heating transformer.
- DC / AC converter oscillating inverter voltage
- ballasts for gas discharge lamps This includes, for example, preheating via the resonant capacitor of the load circuit, via an auxiliary winding on the lamp inductor, via a resonant heating transformer and via a switchable heating transformer.
- a switchable heating transformer such as the one in EP 0 769 889 is shown.
- a corresponding drive signal and a driver or level converter is required, which are usually provided by an ASIC.
- This ASIC usually also implements the entire process control. It is, however also lower cost ASICs on the market that do not provide a drive signal for a heating transformer.
- the object of the present invention is thus to provide a simple drive circuit for a switchable heating transformer, wherein a synchronization with a externally controlled flow control should be possible. Likewise, a corresponding method should be provided.
- a drive circuit for a switchable heating transformer of an electronic ballast having a circuit input terminal for receiving an oscillating inverter voltage having a variable inverter frequency, and a switching device, at the output terminal of the heating transformer can be clamped, and a Frequenzausagonist worn downstream of the circuit input terminal is and with which the inverter frequency is convertible into a drive signal for the switching device.
- the invention provides a method for switching a heating transformer of an electronic ballast by recording an oscillating inverter voltage having a variable inverter frequency, converting the inverter frequency into a drive signal and switching the heating transformer in response to the drive signal.
- the invention is based on the idea that before the ignition of the gas discharge lamp, the frequency in the load circuit is higher than in the nominal mode in which the lamp burns, and therefore the frequency difference can be used to control the heating transformer before the ignition of the lamp.
- the oscillating inverter voltage generated by the mid-point potential of a half-bridge or full-bridge is used to generate a drive signal for the heating transformer, then synchronization with a ballast's externally controlled sequencer is possible.
- the frequency evaluation device preferably has a charge pump. It allows, with simple means, a conversion of the frequency into a drive signal.
- the charge pump may be followed by a voltage divider.
- this switching device consists of a MOSFET transistor. This device is characterized as a reliable switching unit.
- the drive circuit according to the invention is installed in an electronic ballast, for example, a half-bridge generates the oscillating inverter voltage.
- a drive circuit for a heating transformer HT is shown.
- a rectangular oscillating inverter voltage which originates from a half-bridge center, not shown.
- the input E feeds a charge pump.
- This consists of the two capacitors C1 and C2 and the two diodes Dlund D2.
- the capacitor C1 is connected to a terminal at the input E and the other terminal at the cathode of the diode D1.
- the anode of diode D1 is connected to ground.
- the cathode of the diode D1 is further connected to the anode of the diode D2.
- the capacitor C2 is connected on the one hand to the cathode of the diode D2 and on the other hand to ground.
- the capacitors C1 and C2 charge via the diode D2.
- the size of C1 determines the amount of charge carried in C2.
- the diode D2 blocks and the capacitor C1 is discharged via the diode D1. This process is repeated at each period of an oscillating inverter input voltage.
- the average current transferred by the charge pump is directly proportional to the frequency of the inverter, not shown, because with increasing frequency, the charging process takes place in the capacitor C2 more often, so that its voltage increases.
- the resistive load can be implemented as a single resistor R2 or as a voltage divider R1, R2 for more precise adjustment of the voltage.
- the voltage divider R1, R2 is for this purpose between the cathode of the diode D2 and ground and thus parallel to the capacitor C2.
- the center tap between the two resistors R1 and R2, d. H. the output of the voltage part, is used to control a MOSFET transistor S1, which is why its gate is connected to the center tap.
- the gate is also connected to ground with a capacitor C3.
- the source of the MOSFET transistor is also connected to ground, while the drain is connected to the heating transformer HT.
- the voltage applied to the output of the voltage part is directly proportional to the frequency of the rectangular input voltage, provided that its amplitude is constant. Since the MOSFET transistor has a defined switching threshold has, the transistor is turned on and off in response to the frequency of the input voltage. This means that the heating transformer HT is switched on via the switching element MOSFET transistor S1 at a high inverter frequency (preheat phase) and is switched off at a low inverter frequency (lamp operating phase).
- the drive signal thus follows exactly the frequency of the inverter and thus a predetermined sequence control, which is realized for example by an ASIC.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Description
Die vorliegende Erfindung betrifft eine Ansteuerschaltung für einen schaltbaren Heiztransformator eines elektronischen Vorschaltgeräts mit einer Schaltungseingangsklemme zur Aufnahme einer oszillierenden Inverterspannung (DC/AC-Wandler), die eine veränderbare Inverterfrequenz aufweist, und einer Schalteinrichtung, an deren Ausgangsklemme der Heiztransformator anklemmbar ist. Darüber hinaus betrifft die vorliegende Erfindung ein entsprechendes Verfahren zum Schalten eines Heiztransformators.The present invention relates to a drive circuit for a switchable heating transformer of an electronic ballast having a circuit input terminal for receiving an oscillating inverter voltage (DC / AC converter) having a variable inverter frequency, and a switching device, at the output terminal of the heating transformer is clamped. Moreover, the present invention relates to a corresponding method for switching a heating transformer.
Je nach Anwendungsgebiet sind verschiedene Vorheizkonzepte für Vorschaltgeräte für Gasentladungslampen gebräuchlich. Hierzu zählt beispielsweise eine Vorheizung über den Resonanz-Kondensator des Lastkreises, über eine Hilfswicklung auf der Lampendrossel, über einen resonanten Heiztransformator und über einen schaltbaren Heiztransformator. Die kostspieligste aber auch effizienteste Lösung für das Vorheizen besteht in einem schaltbaren Heiztransformator, wie sie in
Zur Ansteuerung eines schaltbaren Heiztransformators ist ein entsprechendes Ansteuersignal und ein Treiber bzw. Pegelwandler erforderlich, die in der Regel von einem ASIC bereitgestellt werden. Dieses ASIC realisiert überlicherweise auch die gesamte Ablaufsteuerung. Es sind jedoch auch kostengünstigere ASICs auf dem Markt, die ein Ansteuersignal für einen Heiztransformator nicht bereitstellen.For driving a switchable heating transformer, a corresponding drive signal and a driver or level converter is required, which are usually provided by an ASIC. This ASIC usually also implements the entire process control. It is, however also lower cost ASICs on the market that do not provide a drive signal for a heating transformer.
Grundsätzlich bestünde die Möglichkeit, den schaltbaren Heiztransformator anstatt durch den ASIC durch ein Verzögerungselement anzusteuern. Mit diesem Verzögerungselement, z. B. Kaltleiter (PTC), kann ein Signal erzeugt werden, das nur kurze Zeit unmittelbar nach dem Einschalten des Geräts aktiv ist. Dieses Verfahren des Ansteuerns mit einem Verzögerungselement erlaubt jedoch keine Synchronisation mit einer fremdgesteuerten Ablaufsteuerung.In principle, it would be possible to control the switchable heating transformer by a delay element instead of through the ASIC. With this delay element, z. B. PTC thermistor, a signal can be generated, which is active only a short time immediately after switching on the device. However, this method of driving with a delay element does not allow synchronization with an externally controlled sequencer.
Die Aufgabe der vorliegenden Erfindung besteht somit darin, eine einfache Ansteuerschaltung für einen schaltbaren Heiztransformator bereitzustellen, wobei eine Synchronisation mit einer fremdgesteuerten Ablaufsteuerung möglich sein soll. Ebenso soll ein entsprechendes Verfahren zur Verfügung gestellt werden.The object of the present invention is thus to provide a simple drive circuit for a switchable heating transformer, wherein a synchronization with a externally controlled flow control should be possible. Likewise, a corresponding method should be provided.
Erfindungsgemäß wird diese Aufgabe gelöst durch eine Ansteuerschaltung für einen schaltbaren Heiztransformator eines elektronischen Vorschaltgeräts mit einer Schaltungseingangsklemme zur Aufnahme einer oszillierenden Inverterspannung, die eine veränderbare Inverterfrequenz aufweist, und einer Schalteinrichtung, an deren Ausgangsklemme der Heiztransformator anklemmbar ist, sowie einer Frequenzauswerteeinrichtung, die der Schaltungseingangsklemme nachgeschaltet ist und mit der die Inverterfrequenz in ein Ansteuersignal für die Schalteinrichtung wandelbar ist.According to the invention this object is achieved by a drive circuit for a switchable heating transformer of an electronic ballast having a circuit input terminal for receiving an oscillating inverter voltage having a variable inverter frequency, and a switching device, at the output terminal of the heating transformer can be clamped, and a Frequenzauswerteeinrichtung downstream of the circuit input terminal is and with which the inverter frequency is convertible into a drive signal for the switching device.
Des Weiteren wird erfindungsgemäß bereitgestellt ein Verfahren zum Schalten eines Heiztransformators eines elektronischen Vorschaltgeräts durch Aufnehmen einer oszillierenden Inverterspannung, die eine veränderbare Inverterfrequenz aufweist, Wandeln der Inverterfrequenz in ein Ansteuersignal und Schalten des Heiztransformators in Abhängigkeit des Ansteuersignals.Furthermore, the invention provides a method for switching a heating transformer of an electronic ballast by recording an oscillating inverter voltage having a variable inverter frequency, converting the inverter frequency into a drive signal and switching the heating transformer in response to the drive signal.
Der Erfindung liegt der Gedanke zu Grunde, dass vor dem Zünden der Gasentladungslampe die Frequenz im Lastkreis höher ist als im Nominalbetrieb, in dem die Lampe brennt, und daher der Frequenzunterschied zu einer Ansteuerung des Heiztransformators vor dem Zünden der Lampe herangezogen werden kann. Wenn also die oszillierende Inverterspannung, die durch das Mittelpunktpotential einer Halbbrücke oder Vollbrücke erzeugt wird, für das Erzeugen eines Ansteuersignals für den Heiztransformator verwendet wird, so ist eine Synchronisation mit einer fremdgesteuerten Ablaufsteuerung des Vorschaltgeräts möglich.The invention is based on the idea that before the ignition of the gas discharge lamp, the frequency in the load circuit is higher than in the nominal mode in which the lamp burns, and therefore the frequency difference can be used to control the heating transformer before the ignition of the lamp. Thus, if the oscillating inverter voltage generated by the mid-point potential of a half-bridge or full-bridge is used to generate a drive signal for the heating transformer, then synchronization with a ballast's externally controlled sequencer is possible.
Vorzugsweise besitzt die Frequenzauswerteeinrichtung eine Ladungspumpe. Sie erlaubt, mit einfachen mitteln eine Umsetzung der Frequenz in ein Ansteuersignal.The frequency evaluation device preferably has a charge pump. It allows, with simple means, a conversion of the frequency into a drive signal.
Der Ladungspumpe kann ein Spannungsteiler nachgeschaltet sein. Dadurch lässt sich der von einer Ladungspumpe erzeugte Strom in eine gewünschte Spannung wandeln. Günstigerweise besteht diese Schalteinrichtung aus einem MOSFET-Transistor. Dieses Bauelement zeichnet sich als zuverlässige Schalteinheit aus.The charge pump may be followed by a voltage divider. As a result, the current generated by a charge pump can be converted into a desired voltage. Conveniently, this switching device consists of a MOSFET transistor. This device is characterized as a reliable switching unit.
Wird die erfindungsgemäße Ansteuerschaltung in ein elektronisches Vorschaltgerät eingebaut, so erzeugt beispielsweise eine Halbbrücke die oszillierende Inverterspannung.If the drive circuit according to the invention is installed in an electronic ballast, for example, a half-bridge generates the oscillating inverter voltage.
Dabei ist es von Vorteil, wenn die Amplitude der oszillierenden Inverterspannung unveränderlich gehalten wird, da dann das Ausgangssignal der Ladungspumpe direkt proportional zur Frequenz der oszillierenden Inverterspannung ist.It is advantageous if the amplitude of the oscillating inverter voltage is kept invariable, since then the output signal of the charge pump is directly proportional to the frequency of the oscillating inverter voltage.
Die vorliegende Erfindung wird nun anhand der beigefügten Zeichnung näher erläutert, die einen Schaltplan einer erfindungsgemäßen Ansteuerschaltung wiedergibt.The present invention will now be explained in more detail with reference to the accompanying drawing, which shows a circuit diagram of a drive circuit according to the invention.
Das nachfolgend näher geschilderte Ausführungsbeispiel stellt eine bevorzugte Ausführungsform der vorliegenden Erfindung dar.The embodiment described in more detail below represents a preferred embodiment of the present invention.
In der Figur ist eine Ansteuerschaltung für einen Heiztransformator HT dargestellt. Am Eingang E der Schaltung liegt eine rechteckförmige oszillierende Inverterspannung an, die von einem nicht dargestellten Halbbrückenmittelpunkt stammt. Über den Eingang E wird eine Ladungspumpe gespeist. Diese besteht aus den beiden Kondensatoren C1 und C2 sowie den beiden Dioden Dlund D2. Der Kondensator C1 liegt mit einer Klemme an dem Eingang E und mit der anderen Klemme an der Kathode der Diode D1. Die Anode der Diode D1 ist mit Masse verbunden. Die Kathode der Diode D1 ist ferner mit der Anode der Diode D2 verbunden. Schließlich ist der Kondensator C2 einerseits mit der Kathode der Diode D2 und andererseits mit Masse verbunden.In the figure, a drive circuit for a heating transformer HT is shown. At the input E of the circuit is a rectangular oscillating inverter voltage, which originates from a half-bridge center, not shown. The input E feeds a charge pump. This consists of the two capacitors C1 and C2 and the two diodes Dlund D2. The capacitor C1 is connected to a terminal at the input E and the other terminal at the cathode of the diode D1. The anode of diode D1 is connected to ground. The cathode of the diode D1 is further connected to the anode of the diode D2. Finally, the capacitor C2 is connected on the one hand to the cathode of the diode D2 and on the other hand to ground.
Im Falle einer positiven Eingangsspannung laden sich die Kondensatoren C1 und C2 über die Diode D2 auf. Dabei bestimmt die Größe von C1 die in C2 beförderte Ladungsmenge. Bei Eingangsspannung Null sperrt die Diode D2 und der Kondensators C1 wird über die Diode D1 entladen. Dieser Vorgang wiederholt sich bei jeder Periode einer oszillierenden Inverter- bzw. Eingangsspannung. Der durch die Ladungspumpe transferierte gemittelte Strom ist direkt proportional zur Frequenz des nicht dargestellten Inverters, denn mit steigender Frequenz erfolgt der Ladevorgang in den Kondensator C2 immer öfter, so dass dessen Spannung zunimmt.In the case of a positive input voltage, the capacitors C1 and C2 charge via the diode D2. The size of C1 determines the amount of charge carried in C2. When input voltage zero, the diode D2 blocks and the capacitor C1 is discharged via the diode D1. This process is repeated at each period of an oscillating inverter input voltage. The average current transferred by the charge pump is directly proportional to the frequency of the inverter, not shown, because with increasing frequency, the charging process takes place in the capacitor C2 more often, so that its voltage increases.
Über eine ohmsche Last wird die am Kondensator C2 anliegende Spannung in geeigneter Weise eingestellt. Die ohmsche Last kann als Einzelwiderstand R2 ausgeführt werden oder als Spannungsteiler R1, R2 zur genaueren Einstellung der Spannung. Der Spannungsteiler R1, R2 liegt hierzu zwischen der Kathode der Diode D2 und Masse und somit parallel zum Kondensator C2. Der Mittenabgriff zwischen den beiden Widerständen R1 und R2, d. h. der Ausgang des Spannungsteils, dient zur Steuerung eines MOSFET-Transistors S1, weshalb dessen Gate mit dem Mittenabgriff verbunden ist. Zur Verbesserung des Schaltverhaltens ist außerdem das Gate mit einem Kondensator C3 an Masse angeschlossen. Die Source des MOSFET-Transistors ist ebenfalls mit Masse verbunden, während der Drain an den Heiztransformator HT angeschlossen ist.About a resistive load applied to the capacitor C2 voltage is adjusted in a suitable manner. The resistive load can be implemented as a single resistor R2 or as a voltage divider R1, R2 for more precise adjustment of the voltage. The voltage divider R1, R2 is for this purpose between the cathode of the diode D2 and ground and thus parallel to the capacitor C2. The center tap between the two resistors R1 and R2, d. H. the output of the voltage part, is used to control a MOSFET transistor S1, which is why its gate is connected to the center tap. To improve the switching behavior, the gate is also connected to ground with a capacitor C3. The source of the MOSFET transistor is also connected to ground, while the drain is connected to the heating transformer HT.
Die am Ausgang des Spannungsteils anliegende Spannung ist direkt proportional zur Frequenz der rechteckförmigen Eingangsspannung, vorausgesetzt, deren Amplitude ist konstant. Da der MOSFET-Transistor eine definierte Schaltschwelle besitzt, wird der Transistor in Abhängigkeit von der Frequenz der Eingangsspannung an- und abgeschaltet. Dies bedeutet, dass der Heiztransformator HT über den als Schaltelement dienenden MOSFET-Transistor S1 bei einer hohen Inverterfrequenz (Vorheizphase) zugeschaltet ist und bei einer niederen Inverterfrequenz (Lampenbetriebsphase) abgeschaltet wird. Das Ansteuersignal folgt damit exakt der Frequenz des Inverters und damit einer vorgegebenen Ablaufsteuerung, die beispielsweise durch ein ASIC realisiert ist.The voltage applied to the output of the voltage part is directly proportional to the frequency of the rectangular input voltage, provided that its amplitude is constant. Since the MOSFET transistor has a defined switching threshold has, the transistor is turned on and off in response to the frequency of the input voltage. This means that the heating transformer HT is switched on via the switching element MOSFET transistor S1 at a high inverter frequency (preheat phase) and is switched off at a low inverter frequency (lamp operating phase). The drive signal thus follows exactly the frequency of the inverter and thus a predetermined sequence control, which is realized for example by an ASIC.
Claims (8)
- Drive circuit for a switchable heating transformer (HT) of an electronic ballast with- an electronic ballast inverter bridge, which produces an oscillating inverter voltage in its center,- a circuit input terminal (E) for picking up an oscillating inverter voltage, which has a variable inverter frequency, and- a switching device (S1), to whose output terminal the heating transformer (HT) can be connected,characterized by- a frequency evaluation device, which is connected downstream of the circuit input terminal (E) and with which the inverter frequency can be converted into a drive signal for the switching device (S1).
- Drive circuit according to Claim 1, the frequency evaluation device having a charge pump (C1, C2, D1, D2).
- Drive circuit according to Claim 2, a voltage divider (R1, R2) being connected downstream of the charge pump (C1, C2, D1, D2).
- Drive circuit according to one of the preceding claims, the switching device (S1) comprising a MOSFET transistor.
- Electronic ballast for a gas discharge lamp with a half-bridge, a load circuit, whose oscillating inverter voltage is produced at the half-bridge, and a drive circuit according to one of the preceding claims.
- Electronic ballast according to Claim 5, the amplitude of the oscillating inverter voltage being kept invariable.
- Method for switching a heating transformer (HT) of an electronic ballast,
characterized by- production of an oscillating inverter voltage at the center point of a ballast inverter bridge,- pickup of the oscillating inverter voltage, which has a variable inverter frequency,- conversion of the inverter frequency into a drive signal, and- switching of the heating transformer (HT) as a function of the drive signal. - Method according to Claim 7, the conversion of the inverter frequency into a drive signal taking place by means of a charge pump (C1, C2, D1, D2) and in the process the amplitude of the oscillating inverter voltage being kept constant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005052525A DE102005052525A1 (en) | 2005-11-03 | 2005-11-03 | Control circuit for a switchable heating transformer of an electronic ballast and corresponding method |
| PCT/EP2006/067786 WO2007051751A1 (en) | 2005-11-03 | 2006-10-26 | Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1943886A1 EP1943886A1 (en) | 2008-07-16 |
| EP1943886B1 true EP1943886B1 (en) | 2009-10-07 |
Family
ID=37607099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06807557A Ceased EP1943886B1 (en) | 2005-11-03 | 2006-10-26 | Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7723920B2 (en) |
| EP (1) | EP1943886B1 (en) |
| KR (1) | KR101339033B1 (en) |
| CN (1) | CN101300906B (en) |
| AU (1) | AU2006310628B2 (en) |
| CA (1) | CA2628465A1 (en) |
| DE (2) | DE102005052525A1 (en) |
| TW (1) | TW200723652A (en) |
| WO (1) | WO2007051751A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2350514A1 (en) * | 1973-10-09 | 1975-04-30 | Endress Hauser Gmbh Co | Circuitry to indicate frequency changes in alternating voltage - has rectifier circuit for voltage and threshold discriminator |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8702383A (en) * | 1987-10-07 | 1989-05-01 | Philips Nv | ELECTRICAL DEVICE FOR IGNITION AND POWERING A GAS DISCHARGE LAMP. |
| US4998046A (en) * | 1989-06-05 | 1991-03-05 | Gte Products Corporation | Synchronized lamp ballast with dimming |
| DE4140557A1 (en) | 1991-12-09 | 1993-06-17 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING ONE OR MORE LOW-PRESSURE DISCHARGE LAMPS |
| DE19520999A1 (en) * | 1995-06-08 | 1996-12-12 | Siemens Ag | Circuit arrangement for filament preheating of fluorescent lamps |
| BE1009717A3 (en) * | 1995-10-20 | 1997-07-01 | Philips Electronics Nv | Shifting. |
| DE19923945A1 (en) * | 1999-05-25 | 2000-12-28 | Tridonic Bauelemente | Electronic ballast for at least one low-pressure discharge lamp |
| US6664742B2 (en) | 2002-01-11 | 2003-12-16 | Koninklijke Philips Electronics N.V. | Filament cut-back circuit |
| DE10345610A1 (en) * | 2003-09-29 | 2005-05-12 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Method for operating at least one low-pressure discharge lamp |
| US7187132B2 (en) * | 2004-12-27 | 2007-03-06 | Osram Sylvania, Inc. | Ballast with filament heating control circuit |
-
2005
- 2005-11-03 DE DE102005052525A patent/DE102005052525A1/en not_active Withdrawn
-
2006
- 2006-10-26 WO PCT/EP2006/067786 patent/WO2007051751A1/en active Application Filing
- 2006-10-26 AU AU2006310628A patent/AU2006310628B2/en not_active Ceased
- 2006-10-26 KR KR1020087013310A patent/KR101339033B1/en not_active IP Right Cessation
- 2006-10-26 CN CN2006800405904A patent/CN101300906B/en not_active Expired - Fee Related
- 2006-10-26 CA CA002628465A patent/CA2628465A1/en not_active Abandoned
- 2006-10-26 EP EP06807557A patent/EP1943886B1/en not_active Ceased
- 2006-10-26 DE DE502006005054T patent/DE502006005054D1/en active Active
- 2006-10-26 US US12/084,465 patent/US7723920B2/en not_active Expired - Fee Related
- 2006-10-31 TW TW095140175A patent/TW200723652A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2350514A1 (en) * | 1973-10-09 | 1975-04-30 | Endress Hauser Gmbh Co | Circuitry to indicate frequency changes in alternating voltage - has rectifier circuit for voltage and threshold discriminator |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2006310628A1 (en) | 2007-05-10 |
| AU2006310628B2 (en) | 2012-07-19 |
| WO2007051751A1 (en) | 2007-05-10 |
| CN101300906B (en) | 2013-12-04 |
| DE102005052525A1 (en) | 2007-05-10 |
| EP1943886A1 (en) | 2008-07-16 |
| KR101339033B1 (en) | 2013-12-09 |
| CA2628465A1 (en) | 2007-05-10 |
| US7723920B2 (en) | 2010-05-25 |
| DE502006005054D1 (en) | 2009-11-19 |
| KR20080067370A (en) | 2008-07-18 |
| TW200723652A (en) | 2007-06-16 |
| CN101300906A (en) | 2008-11-05 |
| US20090160356A1 (en) | 2009-06-25 |
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