EP1326484A2 - Betriebsgerät für Gasentladungslampen - Google Patents
Betriebsgerät für Gasentladungslampen Download PDFInfo
- Publication number
- EP1326484A2 EP1326484A2 EP02027137A EP02027137A EP1326484A2 EP 1326484 A2 EP1326484 A2 EP 1326484A2 EP 02027137 A EP02027137 A EP 02027137A EP 02027137 A EP02027137 A EP 02027137A EP 1326484 A2 EP1326484 A2 EP 1326484A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- diode
- operating device
- bridge
- current
- 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
- H05B41/282—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
- H05B41/2825—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 by means of a bridge converter in the final stage
-
- 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
-
- 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 operating device for gas discharge lamps according to the preamble of claim 1. It is in particular an improvement of the half-bridge inverter contained in the control gear and its Control. Furthermore, the invention deals with the simplification of a shutdown device of the control gear and an inexpensive power factor correction of the electricity consumed by the grid.
- This control gear contains one self-oscillating half-bridge inverter, which consists of a DC voltage high frequency AC voltage is generated by an upper and a lower in series switched half-bridge transistors can be switched on and off alternately.
- the DC voltage is mostly with the help of a bridge rectifier consisting of four Rectifier diodes, generated from the mains voltage.
- Self-swinging means in this connection that the control of the half-bridge transistors from one Load circuit is gained and no independently oscillating oscillator circuit is provided to generate said control. The is preferred said control obtained with the help of a current transformer.
- a Primary winding of the current transformer is arranged in the load circuit and is from flowed through a load current, which are essentially equated to the current Flowed through the load current, which can essentially be equated to the current, which the half-bridge inverter delivers.
- One secondary winding each of the current transformer is arranged in two control circuits, each with a signal generate, which is supplied to the control electrodes of the half-bridge transistors.
- the Load circuit is connected at the junction of the half-bridge transistors.
- the main component of the load circuit is a lamp choke, to which via terminal connections Gas discharge lamps can be connected in series. It is also possible to connect several load circuits in parallel; the primary winding should then be arranged that the sum of all load circuits flows through it.
- a feedback signal is generated which corresponds to the Load current is substantially proportional.
- the secondary windings ideally short-circuited, in practice low-impedance. Otherwise, either appear in the current transformer, or the primary winding has an undesirably large influence on the load circuit.
- bipolar transistors are used for the half-bridge transistors used, which get their control from the secondary windings.
- the base connection of the bipolar transistors, which is used as the control electrode is of course low-impedance enough to Avoid effects.
- the voltage drop at the secondary windings represents under the above conditions is a measure of the load current and forms feedback signals in the prior art. These are each fed to a timer, which in the simplest case comes from the series connection a time capacitor and a time resistor. Is the respective one Time capacitor charged to an integration value that is sufficient to one To control the turn-off transistor, the respective half-bridge transistor is turned off.
- the amplitude of the load current is limited in the prior art. This happens via a first voltage threshold switch, which is parallel to the respective time resistor is switched. If the load current rises above a predetermined one Dimension, the respective feedback signal reaches a value that corresponds to the respective can break through the first voltage threshold switch and thus to the immediate Turning off the respective half-bridge transistor leads.
- MOSFET MOS field effect transistors
- the problem underlying this problem essentially includes the provision of a control signal for the semiconductor switches, that is proportional to the load current.
- bipolar transistors are increasingly being controlled by voltage Semiconductor switches such as MOSFET and IGBT replaced.
- the control circuits each have a second voltage threshold switch equipped, which has a second voltage threshold and in a parallel connection to the secondary winding comes to rest.
- the second voltage threshold switch consists of the series connection of a Zener diode and a current measuring resistor, the zener diode having a zener voltage has, which corresponds to the second voltage threshold. The tension increases on the secondary winding starting at zero, so is the second voltage threshold switch initially ineffective.
- the zener diode When the second voltage threshold is reached the zener diode begins to conduct and closes the secondary winding as required from low resistance.
- the value of the second voltage threshold must be lower be as a threshold voltage which is the voltage controlled semiconductor switch required at least as control.
- the current measuring resistor When dimensioning the current measuring resistor there are two conditions to be met. On the one hand, the value of the Current measurement resistance to be small enough for a low-resistance termination of the Secondary winding is guaranteed. On the other hand, the value of the current measuring resistor be large enough so that the voltage on the secondary winding continues up can rise to the first voltage threshold.
- the voltage across the current measuring resistor is natural a measure of the load current.
- the voltage at the current measuring resistor can thereby be used according to the invention for the detection of an error.
- she is supplied to a shutdown device.
- the time average of the voltage across the current measuring resistor educated. If this exceeds a given limit value, the shutdown device stops another oscillation of the half-bridge inverter. this happens in particular by suppressing the control signal of one of the two Half-bridge transistors.
- the operating devices in question generally have two mains voltage terminals, which can be connected to a mains voltage, whereby a mains current flows can.
- Relevant standards e.g. IEC 1000-3-2
- PFC circuits Power Factor Correction
- An inexpensive Realization of these PFC circuits are so-called pump circuits, as they e.g. B. in EP 253 224 (cultivation bar) or EP 1 028 606 (Rudolph) are.
- Dependent said operating frequency is within the current value of the mains voltage a frequency band that has a bandwidth of over 10 kHz.
- the energy is a disturbed Device hits, advantageously low.
- the effort for interference suppression of an operating device according to the invention can be kept low.
- a start capacitor is usually used to start the half-bridge inverter to charge and a part when reaching a trigger voltage at the charging capacitor the charge stored in the charging capacitor via a trigger element on the control electrode to discharge a half-bridge capacitor. Doing the problem occur that the charge pulse generated in this way to the control electrode in question is short and too low and there is no sustained oscillation of the half-bridge inverter is triggered. According to the invention, part of the stored charge of the Charging capacitor via a diode to the current measuring resistor according to the invention fed. This enables the half-bridge inverter to start up safely to reach.
- resistors are represented by the letter R, transistors by the Letter T, diodes through letter D, capacitors through letter C and terminals by the letter J each followed by a number designated.
- FIG. 1 the basic circuit of an operating device according to the invention is shown.
- the control gear can be connected to a mains voltage via the connection terminals J1, J2 be connected.
- the mains voltage is fed to a block FR.
- It contains well-known filter and rectifier devices.
- the Filter devices have the task of suppressing interference.
- the rectifier device usually consists of a bridge rectifier consisting of four diodes. With the help of the rectifier device becomes a half-bridge inverter HB supplied a DC voltage.
- the half-bridge inverter contains essentially the series connection of an upper semiconductor switch T1 and a lower semiconductor switch T2, which are voltage-controlled according to the invention.
- the exemplary embodiment in FIG. 1 is realized with an N-channel MOSFET.
- IGBT IGBT or P-channel MOSFET can also be used.
- N-channel MOSFET used in Figure 1, it is necessary that the positive Output of the rectifier device via a node 3 to the upper transistor T1 is supplied while the negative output of the rectifier device is connected to the ground potential M.
- the same polarity applies to standard ones IGBT. The polarity must be reversed when using P-channel MOSFET.
- a storage capacitor C1 is located between node 3 and ground potential M. switched, which stores energy from the mains voltage before it is connected to a Lamp Lp is released.
- the half-bridge inverter contains to control the half-bridge transistors T1, T2 HB a drive circuit 1, 2 for each half-bridge transistor T1, T2.
- the control circuits 1, 2 are each connected via a connection A to the respective one Gate connection and via a connection B to the respective source connection of the relevant half-bridge transistor connected.
- the control circuit 2 for the lower half-bridge transistor T2 has a third terminal S, on which a shutdown device can be connected.
- the junction of the half-bridge transistors T1, T2 forms a node 4 to which a load circuit is connected.
- a second connection of the load circuit is in Figure 1 connected to the ground potential M.
- the second connection can have the same effect of the load circuit can alternatively be connected to node 3.
- the load circuit consists essentially of the series connection of a primary winding L2 one Current transformer, a lamp inductor L1, a resonance capacitor C2 and a coupling capacitor C3. Parallel to the resonance capacitor C2 are over the Lamp terminals J3, J4 one or more lamps Lp connected in series can be connected. In the exemplary embodiment, the lamp filaments are not preheated intended.
- FIG. 2 shows a preferred exemplary embodiment of a control circuit according to the invention shown.
- a secondary winding L3 of the current transformer is between a node 20 and the connection B known from FIG. 1.
- a Diode D1 lies with its anode at node 20 and with its cathode at a node 21. Via a resistor R3, the node 21 is connected to that known from FIG Port A connected.
- An integrator is parallel to the secondary winding L3 switched that as a series connection of a timing resistor R1 and a timing capacitor C4 is executed and has an integration constant that the product from the values of R1 and C4.
- the junction of R1 and C4 forms a node 22.
- an integration value is tapped and the Control electrode of a semiconductor switch T3 supplied.
- the switching path of the semiconductor switch T3 lies between the connections A and B. This can be done in parallel, like In the exemplary embodiment, a resistor R4 is connected to increase the switching reliability become.
- the semiconductor switch T3 is preferred as a small-signal bipolar transistor executed.
- first voltage threshold switch switched a first voltage threshold. It is designed as a Zener diode D3. exceeds the voltage fed into the drive circuit by L3 has a value, which leads to the Zener voltage of D3 being exceeded, so becomes the time capacitor C4 not only loaded via the time resistor R1, but also via D3, whereby the integration constant of the integration element is reduced.
- the node 21 and the connection B there is a second one between the node 21 and the connection B.
- Voltage threshold switch switched with a second voltage threshold. He is preferred as a series connection of a Zener diode D2 and a current measuring resistor R2 executed.
- the over Port A controlled the assigned half-bridge transistor.
- the voltage across R2 rises to become the Zener voltage of D2 exceeded. This results in a current flow through the current measuring resistor R2, which is essentially proportional to the load current in the load circuit. So that will Prevents saturation of the current transformer and load current proportional Charge of the integrator reached. Is the current in the load circuit so great that the Zener voltage of D3 is exceeded, so there is a quick shutdown of the associated half-bridge transistor.
- connection B a load current can be connected to it proportional voltage can be taken. This can be done as shown below Shutdown device are supplied. Because the voltages in the shutdown device generally refer to the ground potential M, has only that drive circuit assigned to the lower half-bridge transistor has a connection S.
- module value D2 5.6V D3 22V R1 1,8k ⁇ R2 27 ⁇ R3 220 ⁇ R4 2,2k ⁇ C4 10nF
- the half-bridge inverter HB according to the invention, as shown in the Figures 1 and 2 is described, realized in an operating device with a pump circuit.
- the positive output of the rectifier device in block FR not directly connected to node 3, but via two in parallel switched series connections of two diodes each.
- a first diode series circuit with a first diode connection point form the diodes D5 and D6.
- Different nodes of the load circuit known from FIG. 1 are connected to the diode connection points via reactance bipoles.
- the lamp clamp J3 is connected to the first diode connection point via a pump capacitor C6 connected.
- the lamp clamp J3 stands out from the Lamp clamp J4 characterized by the value of the amplitude of its AC component is greater than the ground potential.
- the resonance capacitor C2 from Figure 1 is omitted. Its function is taken over by the pump capacitor C6.
- connection point of the primary winding L2 and the lamp inductor L1 is over the series connection of a pump inductor L4 and a capacitor C7 with the second Diode connection point connected.
- Pump choke L4 can also be used directly at the node 4 known from FIG. 1, which is the connection point of the half-break transistors T1 and T2 are connected.
- the capacitor C7 essentially serves to block a direct current component in the current through the pump throttle L4.
- the node 4 known from FIG. 1 is connected via a second pump capacitor C5 connected to the first diode connection point.
- FIG. 3 shows a pump circuit structure with 3 so-called pump branches: a Pump branch is represented by the pump capacitor C6, another by the second pump capacitor C5 and a third through the inductor L4.
- a Pump branch is represented by the pump capacitor C6, another by the second pump capacitor C5 and a third through the inductor L4.
- everyone Pump branch by itself already has an effect as a PFC circuit, so that is not mandatory all three pump branches must always be present. Rather, any one is Combination of pump branches possible.
- diodes D5 and D7 Another variation possibility concerns the diodes D5 and D7. These diodes can also perform functions that the rectifier device in the block FR assigned. Corresponding diodes in the rectifier device can then omitted.
- FIG. 4 shows how the current measuring resistor R2 according to the invention and thus Connected connection S from Figure 2 advantageous for a shutdown and a starting device of the control gear can be used.
- the shutdown device contains a well-known thyristomach formation from the resistors R42, R43, R44 and R45 and the transistors T41 and T42.
- the thyristor simulation is via a resistor R41 with node 3 connected from Figure 1.
- the other end of the thyristor simulation is at ground potential M.
- connection S is a voltage divider consisting of the resistors R46 and R47 are fed a voltage that is proportional to the load current.
- the Voltage divider divides the voltage fed in to a value that is normally the control gear is not switched off.
- a capacitor C40 the is fed by the voltage divider, the time average of the load current is formed and provided in the form of a voltage related to the ground potential.
- This Voltage is supplied to the control electrode of a semiconductor switch, which acts as a bipolar transistor T43 is executed.
- a connection G2 is connected via a diode D42 is connected to the control electrode of the lower half-bridge transistor, with the Ground potential M connected. This will result in further oscillation of the half-bridge inverter prevented.
- the oscillation of the half-bridge inverter is started with the help of a generally known starting capacitor C41, which is made via the resistor R41 Mains voltage is charged.
- a trigger diode D40 (DIAC) is connected to C41. If the voltage at C41 reaches the trigger voltage of the trigger diode D40, the Control electrode of the lower half-bridge transistor via a diode D41 and A start pulse is applied to connection G2. In practice it happens that this start pulse is too short and the oscillation of the Half-bridge inverter takes place.
- Port S is therefore advantageously used: According to the invention, the connection S is connected to the trigger diode via a diode D43 D40 connected.
- the start pulse not only runs via diode D41, but also according to the invention also via the diode D43 and further via the diode D2 and the Resistor R3 from FIG. 2.
- the starting pulse is lengthened and enlarged which leads to a safe start of the oscillation of the half-bridge inverter.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Abstract
Description
- Figur 1
- die Grundschaltung des erfindungsgemäßen Betriebsgeräts
- Figur 2
- ein Ausführungsbeispiel einer erfindungsgemäßen Ansteuerschaltung
- Figur 3
- ein Ausführungsbeispiel eines erfindungsgemäßen Betriebsgeräts mit Pumpschaltung
- Figur 4
- ein Ausführungsbeispiel für eine erfindungsgemäße Abschalteinrichtung
Bauelement | Wert |
D2 | 5,6V |
D3 | 22V |
R1 | 1,8kΩ |
R2 | 27Ω |
R3 | 220Ω |
R4 | 2,2kΩ |
C4 | 10nF |
Claims (8)
- Betriebsgerät zum Betrieb von Gasentladungslampen mit folgenden Merkmalen:Selbstschwingender Halbbrückenwechselrichter (HB), der die Serienschaltung von zwei Halbbrückentransistoren (T1, T2) enthält,Lastkreis, der an der Verbindungsstelle der Halbbrückentransistoren (4) angeschlossen ist und der eine Primärwicklung (L2) eines Stromtransformators enthält, durch die ein Laststrom fließt, der dem Halbbrückenwechselrichter (HB) entnommen wird,jeweils eine Ansteuerschaltung (1, 2) für jeden Halbbrückentransistor (T1, T2), die jeweils folgende Bestandteile enthält:eine Sekundärwicklung (L3) des Stromtransformators,ein Integrationsglied (R1, C4), das im wesentlichen die Spannung an der Sekundärwicklung (L3) des Stromtransformators integriert und bei Erreichen eines vorgegebenen Integrationswerts den betreffenden Halbbrückentransistor abschaltet,einen ersten Spannungsschwellwertschalter (D3), der bei Erreichen einer gegebenen ersten Spannungsschwelle die Integrationskonstante des Integrationsglieds reduziert,die Halbbrückentransistoren (Tl, T2) im wesentlichen spannungsgesteuerte Transistoren sind undmindestens eine Ansteuerschaltung (1,2) einen zweiten Spannungsschwellwertschalter (D2, R2) mit einer zweiten Spannungsschwelle besitzt, die niedriger liegt, als die erste Spannungsschwelle, wobei der zweite Spannungsschwellwertschalter (D2, R2) in einer Parallelschaltung zur Sekundärwicklung (L3) zu liegen kommt.
- Betriebsgerät gemäß Anspruch 1, dadurch gekennzeichnet, dass der zweite Spannungsschwellwertschalter die Serienschaltung aus einer Zenerdiode (D2) und einem Strommesswiderstand (R2) enthält.
- Betriebsgerät gemäß Anspruch 2, dadurch gekennzeichnet, dass die Spannung am Strommesswiderstand (R2) einer Abschalteinrichtung zugeführt wird, die das zeitliche Mittel oder den Momentanwert dieser Spannung auswertet und bei Überschreitung eines gegebenen Grenzwerts eine weitere Oszillation des Halbbrückenwechselrichters (HB) unterbindet.
- Betriebsgerät gemäß Anspruch 1, dadurch gekennzeichnet, dass das Betriebsgerät zwei Netzspannungsklemmen (J1, J2) besitzt, die mit einer Netzspannung verbunden werden können und eine Leistungsfaktorkorrektur eines über die Netzspannungsklemmen (J1, J2) fließenden Netzstroms durch eine Pumpschaltung erreicht wird.
- Betriebsgerät gemäß Anspruch 4, dadurch gekennzeichnet, dass die Pumpschaltung folgende Merkmale aufweist:ein Teil des Netzstroms fließt über eine erste Pumpdiode (D5), die mit einer zweiten Pumpdiode (D6) eine erste Diodenserienschaltung mit einem ersten Diodenverbindungspunkt bildet, wobei die Dioden so gepolt sind, dass sie einen Stromfluss von den Netzklemmen zum Halbbrückenwechselrichter (HB) zulassen,das Betriebsgerät besitzt mindestens zwei Lampenklemmen (J3, J4), die mit Lampenanschlüssen verbindbar sind, wobei eine Lampenklemme (J3) über einen Pumpkondensator (C6) mit dem ersten Diodenverbindungspunkt verbunden ist.
- Betriebsgerät gemäß Anspruch 5, dadurch gekennzeichnet, dass der Pumpkondensator (C6) mit derjenigen Lampenklemme (J3) verbunden ist, die gegenüber einem Bezugspotenzial (M) eine Spannung aufweist, die im Vergleich zur Spannung an den anderen Lampenklemmen (J4) den größten Wert für die Wechselspannungskomponente aufweist.
- Betriebsgerät gemäß Anspruch 5, gekennzeichnet durch folgende Merkmaleparallel zur ersten Diodenserienschaltung ist eine zweite Diodenserienserienschaltung von zwei Dioden (D4, D7) geschaltet wodurch ein zweiter Diodenverbindungspunkt entsteht, wobei die Dioden (D4, D7) so gepolt sind, dass sie einen Stromfluss vom Netz zum Halbbrückenwechselrichter (HB) zulassen,der zweite Diodenverbindungspunkt ist mindestens über eine Pumpdrossel (L4), mit dem Verbindungspunkt (4) der Halbbrückentransistoren (T1, T2) verbunden.
- Betriebsgerät gemäß Anspruch 2, dadurch gekennzeichnet, dass das Betriebsgerät einen Startkondensator (C41) enthält, der über die Serienschaltung einer Triggerdiode (D40) und einer Diode (D43) mit dem Strommesswiderstand (R2) verbunden ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10200049 | 2002-01-02 | ||
DE10200049A DE10200049A1 (de) | 2002-01-02 | 2002-01-02 | Betriebsgerät für Gasentladungslampen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1326484A2 true EP1326484A2 (de) | 2003-07-09 |
EP1326484A3 EP1326484A3 (de) | 2005-01-05 |
EP1326484B1 EP1326484B1 (de) | 2006-08-09 |
Family
ID=7711453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02027137A Expired - Lifetime EP1326484B1 (de) | 2002-01-02 | 2002-12-04 | Betriebsgerät für Gasentladungslampen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6677716B2 (de) |
EP (1) | EP1326484B1 (de) |
CN (1) | CN100438715C (de) |
AT (1) | ATE336156T1 (de) |
CA (1) | CA2415510A1 (de) |
DE (2) | DE10200049A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1530407A3 (de) * | 2003-11-05 | 2007-01-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektronisches Vorschaltgerät mit bei Lampenausfall weiterzubetreibendem Wandler |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10241327A1 (de) * | 2002-09-04 | 2004-03-18 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung zum Betrieb von Entladungslampen |
DE102004001618A1 (de) * | 2004-01-09 | 2005-08-11 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung zum Betrieb von Lichtquellen |
ATE424711T1 (de) * | 2004-06-21 | 2009-03-15 | Koninkl Philips Electronics Nv | Ansteuerverfahren für eine gasentladungslampe |
EP2030487A1 (de) * | 2006-05-31 | 2009-03-04 | Koninklijke Philips Electronics N.V. | Verfahren und system zum betrieb einer gasentladungslampe |
EP2145380B1 (de) * | 2007-04-27 | 2016-01-06 | Koninklijke Philips N.V. | Selbstschwingender schalterstromkreis für einen dc-dc-schaltwandler |
JP4816634B2 (ja) * | 2007-12-28 | 2011-11-16 | ウシオ電機株式会社 | 基板加熱装置及び基板加熱方法 |
US20090200953A1 (en) * | 2008-02-08 | 2009-08-13 | Ray James King | Methods and apparatus for a high power factor ballast having high efficiency during normal operation and during dimming |
US8258712B1 (en) * | 2008-07-25 | 2012-09-04 | Universal Lighting Technologies, Inc. | Ballast circuit for reducing lamp striations |
Citations (6)
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US4525648A (en) * | 1982-04-20 | 1985-06-25 | U.S. Philips Corporation | DC/AC Converter with voltage dependent timing circuit for discharge lamps |
EP0757512A1 (de) * | 1995-07-31 | 1997-02-05 | STMicroelectronics S.r.l. | Steuerungsschaltung, MOS Transistor mit solch einer Schaltung |
EP0781077A2 (de) * | 1995-12-22 | 1997-06-25 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung zum Betrieb einer Lampe |
US5982108A (en) * | 1996-08-14 | 1999-11-09 | U.S. Philips Corporation | DC/AC converter for a discharge lamp having a DC offset at the switching element to reduce power loss |
EP1001662A2 (de) * | 1998-11-16 | 2000-05-17 | General Electric Company | Elektronisches Vorschaltgerät für Entladungslampen mit Ausgangsspannungsbegrenzung |
US6346779B1 (en) * | 1999-05-21 | 2002-02-12 | Stmicroelectronics S.R.L. | Variable frequency self-oscillating half-bridge drive architecture particularly for electric loads |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5173643A (en) * | 1990-06-25 | 1992-12-22 | Lutron Electronics Co., Inc. | Circuit for dimming compact fluorescent lamps |
US5545955A (en) * | 1994-03-04 | 1996-08-13 | International Rectifier Corporation | MOS gate driver for ballast circuits |
JP3484863B2 (ja) * | 1995-03-29 | 2004-01-06 | 東芝ライテック株式会社 | 電源装置、放電灯点灯装置および照明装置 |
US5619106A (en) * | 1996-06-24 | 1997-04-08 | General Electric Company | Diodeless start circiut for gas discharge lamp having a voltage divider connected across the switching element of the inverter |
US6541925B1 (en) * | 1998-11-18 | 2003-04-01 | Koninklijke Philips Electronics N.V. | Resonant converter circuit with suppression of transients during changes in operating condition |
-
2002
- 2002-01-02 DE DE10200049A patent/DE10200049A1/de not_active Withdrawn
- 2002-12-04 AT AT02027137T patent/ATE336156T1/de active
- 2002-12-04 EP EP02027137A patent/EP1326484B1/de not_active Expired - Lifetime
- 2002-12-04 DE DE50207779T patent/DE50207779D1/de not_active Expired - Lifetime
- 2002-12-20 US US10/323,748 patent/US6677716B2/en not_active Expired - Fee Related
- 2002-12-30 CA CA002415510A patent/CA2415510A1/en not_active Abandoned
-
2003
- 2003-01-02 CN CNB031009034A patent/CN100438715C/zh not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525648A (en) * | 1982-04-20 | 1985-06-25 | U.S. Philips Corporation | DC/AC Converter with voltage dependent timing circuit for discharge lamps |
EP0757512A1 (de) * | 1995-07-31 | 1997-02-05 | STMicroelectronics S.r.l. | Steuerungsschaltung, MOS Transistor mit solch einer Schaltung |
EP0781077A2 (de) * | 1995-12-22 | 1997-06-25 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung zum Betrieb einer Lampe |
US5982108A (en) * | 1996-08-14 | 1999-11-09 | U.S. Philips Corporation | DC/AC converter for a discharge lamp having a DC offset at the switching element to reduce power loss |
EP1001662A2 (de) * | 1998-11-16 | 2000-05-17 | General Electric Company | Elektronisches Vorschaltgerät für Entladungslampen mit Ausgangsspannungsbegrenzung |
US6346779B1 (en) * | 1999-05-21 | 2002-02-12 | Stmicroelectronics S.R.L. | Variable frequency self-oscillating half-bridge drive architecture particularly for electric loads |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1530407A3 (de) * | 2003-11-05 | 2007-01-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektronisches Vorschaltgerät mit bei Lampenausfall weiterzubetreibendem Wandler |
Also Published As
Publication number | Publication date |
---|---|
CN1430460A (zh) | 2003-07-16 |
CN100438715C (zh) | 2008-11-26 |
CA2415510A1 (en) | 2003-07-02 |
US20030122504A1 (en) | 2003-07-03 |
DE50207779D1 (de) | 2006-09-21 |
US6677716B2 (en) | 2004-01-13 |
DE10200049A1 (de) | 2003-07-17 |
EP1326484A3 (de) | 2005-01-05 |
ATE336156T1 (de) | 2006-09-15 |
EP1326484B1 (de) | 2006-08-09 |
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