EP1233657A2 - Schutzschaltung für eine Leuchtstofflampe - Google Patents
Schutzschaltung für eine Leuchtstofflampe Download PDFInfo
- Publication number
- EP1233657A2 EP1233657A2 EP02001285A EP02001285A EP1233657A2 EP 1233657 A2 EP1233657 A2 EP 1233657A2 EP 02001285 A EP02001285 A EP 02001285A EP 02001285 A EP02001285 A EP 02001285A EP 1233657 A2 EP1233657 A2 EP 1233657A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistor
- point
- partial
- voltage
- protection circuit
- 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
Links
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 protective circuit for a fluorescent lamp with a first and a second lamp filament, comprising a DC voltage source with a plus and a minus pole, a half-bridge arrangement with a first and a second switch, the Half-bridge arrangement is fed by the DC voltage source and the first and the second switch to form a first reference point are connected to each other, the first reference point via a first Resistor is connected to the negative pole, a coupling-out capacitor, that in a serial connection between the half-bridge arrangement and the first or the second coil is arranged, the spiral connection of the decoupling capacitor a second reference point forms the via a second resistor with the negative pole is connected to a comparator which has a first and a second input and has an output, the first input with the first Reference point and the second input connected to the second reference point is, the output via a detection capacitor with the Minus pole is connected, and an evaluation circuit with which on the detection capacitor falling voltage can be evaluated in order to be exceeded a predetermined voltage level deactivation of
- Such a protective circuit is known and is used, for example, by Applicant of the present invention in ballasts for fluorescent lamps built-in.
- the protection circuit is at the end of life the fluorescent lamp, i.e. if the lamp is not yet defective, a criterion evaluate this in good time before overheating in the spiral area (Risk of melting of the socket) to switch off the half-bridge arrangement leads (also known as end-of-life shutdown).
- a criterion evaluate this in good time before overheating in the spiral area (Risk of melting of the socket) to switch off the half-bridge arrangement leads also known as end-of-life shutdown.
- the filaments of a fluorescent lamp with an emitter are covered to reduce the work function of the electrons.
- the emitter is missing on one of the two lamp filaments the fluorescent lamp noticeable in that the work function slowly increases again and thus the output coupling capacitor falling voltage changes.
- normal operation i.e.
- the two reference points are on average at a potential equal to half the voltage from the DC voltage source is made available. At the end of life the second of the two reference points at a different potential and thus the reference points at different potential.
- the potential difference is used to charge a detection capacitor, the Evaluation circuit is advantageously implemented so that a voltage level is adjustable, if it is exceeded, a deactivation of the half-bridge arrangement is effected.
- ballasts in which one End-of-life detection and relamping are realized and there is one second category of ballasts where only the end-of-life detection is realized.
- the Replacing a fluorescent lamp in a factory hall all lamps be turned off to reset the end-of-life detection to effect.
- a new lamp can only be switched off after all the lamps have been switched off can be used instead of the decrepit lamp. Subsequently all lamps can be switched on again. Especially in large ones Such interruptions are undesirable in factories.
- the object of the present invention is therefore an economical Realization of the end-of-life detection and the relamping function to make available.
- the generic Protection circuit also has a third resistor, the Coupling capacitor bridges and a fourth resistor, the connects the first reference point to the positive pole of the DC voltage source, the first, second, third and fourth resistors chosen in this way are that the first and the second reference point without inserted Fluorescent lamp are at the same potential.
- the invention is based on the idea of the end-of-life detection circuit to be interpreted or to implement the relamping function in such a way that as possible many components are shared. With a mass product like the present protective circuit, this allows almost no additional effort an inexpensive implementation of the additional relamping function realize what is in a very desirable price reduction results.
- the idea here is to give the comparator an asymmetry detected, with the fluorescent lamp removed at its two entrances to supply identical potentials that reset the shutdown of the Effect half-bridge arrangement.
- the two reference points are on average half the potential available from the DC voltage source set DC voltage. This is usually the so-called intermediate circuit voltage and is usually connected to an intermediate circuit capacitor provided.
- the ratio of first resistance to fourth resistance is the same as large as the ratio of second resistance to third resistance.
- the first resistance includes a first and a second partial resistor connected in series with one another and the second resistor a third and a fourth to each other Partial resistor connected in series, the first reference point with the Connection point of the first partial resistor and the fourth resistor and the second reference point with the connection point of the third resistor and the third partial resistor is connected and the first input of the comparator with the connection point between the first and second partial resistor is connected and the second input of the comparator with the connection point between the third and fourth Partial resistance is connected.
- the ratio of the sum of the first and second partial resistances is preferred to the fourth resistance equal to the ratio of the sum of the third and fourth partial resistors chosen as the third resistor. In the event that the ratios are chosen to be one again, the both reference points when the fluorescent lamp is removed a potential half of that available from the DC voltage source set DC voltage corresponds.
- the comparator comprises a first and a second switching element, each comprise a working, a control and a reference electrode, the fourth partial resistor a fifth and a sixth to each other in series switched partial resistance, the connection point between the first and the second partial resistance with the reference electrode of the first and connected to the control electrode of the second switching element is the connection point between the third partial resistor and the fifth partial resistor with the control electrode of the first switching element - is connected, the connection point between the fifth and the sixth Resistor connected to the reference electrode of the second switching element is, the working electrode of the first switching element and the working electrode of the second switching element with each other and via a series connection with a fifth resistor and the detection capacitor Mass are connected.
- the ratio of the partial resistances three, five and six the potential difference required to start charging of the detection capacitor leads can be set. In this embodiment is the comparator in very simple and inexpensive Form realized.
- the ratio of the fourth resistance to the sum is preferred the first and the second partial resistance equal to the ratio of the third resistance to the sum of the third, fifth and sixth partial resistance. Especially if the ratio is 1 the reference points again on a fluorescent lamp Potential that half provided by the DC voltage source DC voltage corresponds.
- the evaluation circuit can comprise a holding element with a tripping potential and be designed such that as soon as the trigger potential point assumes predetermined potential, especially through a one-off Pulse, the holding element can be activated to the half-bridge circuit deactivate until a reset process by removing the fluorescent lamp is triggered. This measure ensures safe deactivation the half-bridge arrangement and thus for particularly high reliability the protection circuit according to the invention.
- a first threshold value component in particular a zener diode, can be arranged with which the threshold can be set when it is exceeded deactivation of the half-bridge circuit is triggered. This measure enables activation of the holding member in the case of a predefinable one Detection capacitor voltage.
- the ignition voltage limiting circuit can be a measuring element Have a measurement proportional to the ignition current, so that the Value of this size can be used to activate the holding member.
- This Embodiment takes advantage of the fact that the ignition current is approximately proportional to the ignition voltage and is therefore used as a measure of the ignition voltage can be. Since the ignition current is easier to measure than the ignition voltage, This results in a simple construction of the circuit arrangement.
- a second threshold component in particular a Zener diode arranged with which the threshold can be set is a deactivation of the half-bridge circuit when exceeded is triggered.
- the measuring element can in particular be a resistor which is connected in series to one the half-bridge switch is arranged.
- This embodiment is the Based on the knowledge that the ignition current also through the half-bridge arrangement is made available and therefore the half-bridge arrangement flowing current is proportional to the ignition current.
- a resistor arranged in series with one of the half-bridge switches is particularly easy to proportional to the ignition current Determine size.
- the embodiments according to the invention preferably further comprise suitable sieve circuits to at the reference and potential points Provide DC voltages for evaluation.
- suitable sieve circuits to at the reference and potential points Provide DC voltages for evaluation.
- the half-bridge arrangement makes that of the DC voltage source provided DC voltage into an AC voltage converted, which is reflected in the subsequent protection circuit.
- suitable sieve circuits for example, using capacitors will be provided for further processing.
- a capacitor C1 provides a voltage Uz which is used to supply the following circuit arrangement.
- a half-bridge arrangement comprises a first switch S1 and a second switch S2. The controls of switches S1 and S2 are well known to the person skilled in the art and are therefore not shown in FIG. 1 for reasons of clarity.
- the half-bridge arrangement feeds a fluorescent lamp L A with a first filament W1 and a second filament W2 via a coupling-out capacitor C2.
- the fluorescent lamp L A is connected to an ignition circuit Zs, which is designed to cause the lamp L A to ignite
- the center point of the half-bridge arrangement forms a first reference point A, which is connected to the lamp L A via a lamp inductor L D.
- the helical connection of the coupling capacitor C2 forms a second reference point B.
- the potentials of both reference points A, B are fed to a comparator V G , the output of which is connected to a detection capacitor C3.
- the across the capacitor C3 C3 voltage U is fed to an evaluation circuit AS, which causes a deactivation of the half-bridge arrangement upon exceeding a predetermined voltage level.
- the potentials of the reference points A and B shift due to the lack of emitter on one of the two spiral electrodes W1, W2 and the consequent increase in the work function of one of the two spiral electrodes W1, W2, even if the increase in the work function only is minimal.
- the potential difference between the two reference points leads to the charging of the capacitor C3 and thus to the build-up of the voltage U C3 . If this exceeds a certain value, the half-bridge arrangement is switched off by the evaluation circuit As and thus prevents overheating in the spiral area.
- the reference points A and B are on average at half the voltage U Z.
- the decoupling capacitor C2 could also be arranged at another location, for example between the lamp inductor L D and the filament electrode W2.
- the voltage on the coil electrode W1 would increase, which would lead to an increase in the voltage drop across the capacitor C2. This would increase the potential B compared to the potential A. If the emitter on the helix electrode W2 were consumed before the emitter on the helix electrode W1 was consumed, the potential at reference point A would drop compared to the potential at reference point B.
- a relamping function is implemented by resetting the voltage on capacitor C3 by applying identical potential to the two inputs of the comparator.
- the first reference point A is connected via a resistor R1, the second reference point B via a resistor R2 to the negative pole of the voltage U Z.
- the positive pole of the voltage U Z is connected on the one hand to the reference point B via a resistor R3, which bridges the capacitor C2, and on the other hand via a resistor R4 to the reference point A.
- Suitable dimensioning of the two voltage dividers R4, R1 and R3, R2 can achieve this that the potentials at the reference points A, B are identical when the lamp L A is removed and thus lead to a reset of the end-of-life detection.
- the ratio of the resistor R1 to the resistor R4 and from the resistor R2 to the resistor R3 equal to 1, half the voltage of U Z is established at the two reference points A, B.
- the resistors R1 and R2 are divided into two partial resistors R11, R12 and R21, R22. Appropriate dimensioning of the partial resistors can ensure that the majority of the voltages present at reference points A, B drop across the partial resistors R11 and R21. Accordingly, the comparator V G is only subjected to low voltages and can therefore be implemented with less voltage-resistant components.
- FIGS. 3a / b an overall circuit for operating a fluorescent lamp is shown, which can be connected to a power supply via the terminals K1 and K2.
- a fuse SI is arranged after the terminal K1, followed by a filter circuit comprising a capacitor C4 and an inductor L3 before the line signal is rectified in a line rectifier N GR .
- the rectified output signal of the line rectifier N GR is buffered in the capacitor C1 and is used to supply the following circuit arrangement.
- the resistor R22 of FIG. 2 is divided into two partial resistors R221 and R222.
- a resistor R5 is connected in parallel with the capacitor C3, which enables the capacitor C3 to be discharged.
- a capacitor C5 is connected in parallel with the resistor R12, while a capacitor C6 is connected in parallel with the series circuit comprising the resistors R221 and R222. These measures ensure that DC signals are present at the bases of two switching elements T1, T2 contained in the comparator.
- the control electrode of the switching element T1 is connected to the connection point D between the resistor R21 and the resistor R221.
- the reference electrode of the switching element T1 and the control electrode of the switching element T2 are connected to the connection point C of the resistors R11 and R12.
- the reference electrode of the switching element T2 is connected to the connection point E between the resistors R221 and R222.
- the working electrodes of both switching elements T1, T2 are connected via a resistor R6 to the connection point F, to which the capacitor C3 is connected. Since the voltage at reference point A is constant, a suitable choice of resistors R11 and R12 can be used to set a voltage of 15 V at connection point C, for example. By suitable dimensioning of the resistors R21, R221 and R222, during normal operation, ie the potential at point A is equal to the potential at point B, a voltage can be set which is 18 V at point D and 12 V at point E. In this state, the two switching elements T1, T2 are blocked.
- the switching element T1 begins to conduct when the voltage at point D becomes less than the voltage at point C. As long as the voltage at point E is less than the voltage at point C. the switching element T2 locked. By conducting the switching element T1, the capacitor C3 is in turn charged via the resistor R6. With the magnitude of the voltage difference between the potential points C and D or C and E, the switching threshold and thus the degree of asymmetry at which the switch-off takes place can also be set.
- the voltage at point F which corresponds to the state of charge of capacitor C3, is transmitted via a diode D1 and a Zener diode Z1 to a triggering potential point G in a holding element HG.
- the holding element HG is supplied via the charge stored in a capacitor C7 of a starting circuit ST.
- the switching element T4 switches through.
- the switching element T3 switches through and thus supplies the holding current for a holding element that is self-holding in this way.
- the resistor R8 in combination with the capacitor C8 and the resistor R9 in combination with the capacitor C9 ensure that faults are eliminated, thereby preventing the holding element from being activated accidentally. Because the switching element T4 conducts, the potential at point I drops to 0 V.
- the two switches S1 and S2 of the half-bridge circuit have respective control circuits A S1 , A S2 .
- Each drive circuit A S1 , A S2 comprises an inductance L1, L2, which is coupled to the lamp inductor L D. As soon as the potential at point I drops to 0 V, the diode D2 begins to conduct and thus grounds the signal fed into the control circuit A S2 via the inductance L2, so that the switch S2 is no longer activated. This also leads to the switch S1 being switched off.
- An ignition voltage limiting circuit Z SB is also connected to the point G of the holding element H G. It comprises a measuring resistor R10, which is arranged in series with the switch S2. The potential at point J, ie the voltage drop across resistor R10, is proportional to the ignition current and thus proportional to the ignition voltage.
- the ignition voltage limiting voltage Z SB has the task of preventing the ignition circuit Z S from being destroyed, for example in the case of air pullers.
- the ignition circuit Z S comprises two capacitors C10 and C11 and a PTC thermistor PTC1.
- the resistor R14 serves to cause a time delay in the response behavior of the ignition voltage limiting circuit.
- the level can be set via the diodes D3 and Z2 at which an ignition voltage limitation is carried out by acting on the point G of the holding element H G and thus switching off the half-bridge arrangement.
- the voltage across resistor R10 is screened by resistor R9 and capacitor C9.
- the level of the critical ignition voltage can also be influenced by the value of the resistor R10.
- the diode D3 also protects the holding element H G from negative voltage peaks.
- the components of the ignition circuit Z S and the lamp inductor L D can be made smaller by the ignition voltage limiting circuit Z SB .
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
- Fig. 1
- eine erste Ausführungsform einer erfindungsgemäßen Schutzschaltung;
- Fig. 2
- eine zweite Ausführungsform einer erfindungsgemäßen Schutzschaltung; und
- Fig. 3a/b
- eine dritte Ausführungsform einer erfindungsgemäßen Schutzschaltung. Diese dritte Ausführungsform ist aus Platzgründen auf die Fig. 3a und Fig. 3b aufgeteilt. Die Schaltungsteile der Fig. 3a und 3b sind an den korrespondierenden Anschlussstellen J1-J5 als verbunden zu verstehen. Ein Bezug auf diese Figuren erfolgt mit der Bezeichnung Fig. 3a/b.
Claims (13)
- Schutzschaltung für eine Leuchtstofflampe (LA) mit einer ersten und einer zweiten Lampenwendel (W1, W2), umfassend:dadurch gekennzeichnet, daß sie weiterhin einen dritten Widerstand (R3), der den Auskoppelkondensator (C2) überbrückt, und einen vierten Widerstand (R4), der den ersten Referenzpunkt (A) mit dem Pluspol der Gleichspannungsquelle (UZ) verbindet, umfaßt, wobei der erste, der zweite, der dritte und der vierte Widerstand (R1, R2, R3, R4) so gewählt sind, daß der erste und der zweite Referenzpunkt (A, B) ohne eingesetzte Leuchtstofflampe (LA) auf demselben Potential liegen.eine Gleichspannungsquelle (UZ) mit einem Plus- und einem Minuspol;eine Halbbrückenanordnung mit einem ersten und einem zweiten Schalter (S1, S2), wobei die Halbbrückenanordnung von der Gleichspannungsquelle (UZ) gespeist wird und der erste und der zweite Schalter (S1, S2) unter Bildung eines ersten Referenzpunktes (A) miteinander verbunden sind, wobei der erste Referenzpunkt (A) über einen ersten Widerstand (R1) mit dem Minuspol verbunden ist;einem Auskoppelkondensator (C2), der in einer seriellen Verbindung zwischen der Halbbrückenanordnung und der ersten oder der zweiten Lampenwendel (W1; W2) angeordnet ist, wobei der wendelseitige Anschluß des Auskoppelkondensators (C2) einen zweiten Referenzpunkt (B) bildet, der über einen zweiten Widerstand (R2) mit dem Minuspol verbunden ist;einen Vergleicher (VG), der einen ersten und einen zweiten Eingang und einen Ausgang aufweist, wobei der erste Eingang mit dem ersten Referenzpunkt (A) und der zweite Eingang mit dem zweiten Referenzpunkt (B) verbunden ist, wobei der Ausgang über einen Detektionskondensator (C3) mit dem Minuspol verbunden ist;eine Auswerteschaltung (AS), mit der die am Detektionskondensator (C3) abfallende Spannung (UC3) auswertbar ist, um bei Überschreiten eines vorbestimmten Spannungspegels eine Deaktivierung der Halbbrückenanordnung zu bewirken;
- Schutzschaltung nach Anspruch 1,
dadurch gekennzeichnet, daß das Verhältnis aus erstem Widerstand (R1) zum viertem Widerstand (R4) gleich groß ist wie das Verhältnis aus zweitem Widerstand (R2) zum drittem Widerstand (R3), insbesondere gleich 1 ist. - Schutzschaltung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der erste Widerstand (R1) einen ersten und einen zweiten zueinander in Serie geschalteten Teilwiderstand (R11, R12) und der zweite Widerstand einen dritten und einen vierten zueinander in Serie geschalteten Teilwiderstand (R21, R22) umfaßt, wobei der erste Referenzpunkt (A) mit dem Verbindungspunkt des ersten Teilwiderstands (R11) und des vierten Widerstands (R4) und der zweite Referenzpunkt (B) mit dem Verbindungspunkt des dritten Widerstands (R3) und des dritten Teilwiderstands (R21) verbunden ist, und
der erste Eingang des Vergleichers (VG) mit dem Verbindungspunkt zwischen dem ersten und zweiten Teilwiderstand (R11, R12) verbunden ist, und der zweite Eingang des Vergleichers (VG) mit dem Verbindungspunkt zwischen dem dritten und dem vierten Teilwiderstand (R21, R22) verbunden ist. - Schutzschaltung nach Anspruch 3,
dadurch gekennzeichnet, daß das Verhältnis aus der Summe des ersten und zweiten Teilwiderstands (R11, R12) zum vierten Widerstand (R4) gleich ist dem Verhältnis aus der Summe des dritten und vierten Teilwiderstands (R21, R22) zum dritten Widerstand (R3), insbesondere gleich 1 ist. - Schutzschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der Vergleicher (VG) ein erstes und ein zweites Schaltelement (T1, T2) umfaßt, die jeweils eine Arbeits-, eine Steuer-, und eine Bezugselektrode umfassen,
wobei der vierte Teilwiderstand (R22) einen fünften und einen sechsten zueinander in Serie geschalteten Teilwiderstand (R221, R222) umfaßt,
wobei der Verbindungspunkt zwischen dem ersten und dem zweiten Teilwiderstand (R11, R12) mit der Bezugselektrode des ersten (T1) und mit der Steuerelektrode des zweiten Schaltelements (T2) verbunden ist, der Verbindungspunkt zwischen dem dritten Teilwiderstand (R21) und dem fünften Teilwiderstand (R221) mit der Steuerelektrode des ersten Schaltelements (T1) verbunden ist, der Verbindungspunkt zwischen dem fünften und dem sechsten Widerstand (R221, R222) mit der Bezugselektrode des zweiten Schaltelements (T2) verbunden ist, die Arbeitselektrode des ersten Schaltelements (T1) und die Arbeitselektrode des zweiten Schaltelements (T2) miteinander und über eine Serienschaltung aus einem fünften Widerstand (R6) und dem Detektionskondensator (C3) mit Masse verbunden sind. - Schutzschaltung nach Anspruch 5,
dadurch gekennzeichnet, daß das Verhältnis aus dem vierten Widerstand (R4) zu der Summe aus dem ersten und dem zweiten Teilwiderstand (R11, R12) gleich ist dem Verhältnis aus dem dritten Widerstand (R3) zur Summe aus dem dritten, fünften und sechsten Teilwiderstand (R21, R221, R222), insbesondere gleich 1 ist. - Schutzschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß die Auswerteschaltung (AS) ein Halteglied (HG) mit einem Auslösepotentialpunkt (G) umfaßt und derart ausgelegt ist, daß, sobald der Auslösepotentialpunkt (G) ein vorbestimmtes Potential annimmt, insbesondere bereits durch einen einmaligen Impuls, das Halteglied (HG) aktivierbar ist, um die Halbbrückenschaltung solange zu deaktivieren, bis durch Entfernen der Leuchtstofflampe (LA) ein Rücksetzvorgang ausgelöst wird. - Schutzschaltung nach Anspruch 7,
dadurch gekennzeichnet, daß zwischen dem Vergleicher (VG) und dem Auslösepotentialpunkt (G) des Halteglieds (HG) ein erstes Schwellwertbauelement (Z1), insbesondere eine Zenerdiode angeordnet ist, mit dem die Schwelle einstellbar ist, bei deren Überschreiten eine Deaktivierung der Halbbrückenschaltung ausgelöst wird. - Schutzschaltung nach einem der Ansprüche 7 oder 8,
dadurch gekennzeichnet, daß mit dem Auslösepotentialpunkt (G) eine Zündspannungsbegrenzungsschaltung (ZSB) derart verbunden ist, daß bei Detektion einer Überschreitung einer vorbestimmten Zündspannung das Halteglied (HG) aktivierbar ist. - Schutzschaltung nach Anspruch 9,
dadurch gekennzeichnet, daß die Zündspannungsbegrenzungsschaltung (ZSB) ein Meßglied (R10) zur Messung einer zum Zündstrom proportionalen Größe aufweist, so daß der Wert dieser Größe zum Aktivieren des Halteglieds (HG) verwendbar ist. - Schutzschaltung nach Anspruch 10,
dadurch gekennzeichnet, daß zwischen einem Potentialpunkt (J) der Zündspannungsbegrenzungsschaltung (ZSB), dessen Potential zum Zündstrom proportional ist, und dem Auslösepotentialpunkt des Halteglieds (HG) ein zweites Schwellwertbauelement (Z2), insbesondere eine Zenerdiode angeordnet ist, mit der die Schwelle einstellbar ist, bei deren Überschreiten eine Deaktivierung der Halbbrückenschaltung ausgelöst wird. - Schutzschaltung nach einem der Ansprüche 10 oder 11,
dadurch gekennzeichnet, daß das Meßglied (R10) ein Widerstand ist, der seriell zu einem der Halbbrückenschalter (S1; S2) angeordnet ist. - Schutzschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß sie weiterhin geeignete Siebschaltungen (C6, C5, C8, R8, C9, R9, R14) umfaßt, um an den Referenz- und Potentialpunkten (A, B, G, J) Gleichspannungen zur Auswertung bereitzustellen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10108138A DE10108138A1 (de) | 2001-02-20 | 2001-02-20 | Schutzschaltung für eine Leuchstofflampe |
| DE10108138 | 2001-02-20 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1233657A2 true EP1233657A2 (de) | 2002-08-21 |
| EP1233657A3 EP1233657A3 (de) | 2006-05-24 |
| EP1233657B1 EP1233657B1 (de) | 2007-07-25 |
Family
ID=7674857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02001285A Expired - Lifetime EP1233657B1 (de) | 2001-02-20 | 2002-01-17 | Schutzschaltung für eine Leuchtstofflampe |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6650514B2 (de) |
| EP (1) | EP1233657B1 (de) |
| CN (1) | CN100477880C (de) |
| AT (1) | ATE368367T1 (de) |
| CA (1) | CA2373571A1 (de) |
| DE (2) | DE10108138A1 (de) |
| TW (1) | TW540255B (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008119376A1 (de) * | 2007-03-29 | 2008-10-09 | Osram Gesellschaft mit beschränkter Haftung | Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe |
| WO2008128565A1 (de) * | 2007-04-19 | 2008-10-30 | Osram Gesellschaft mit beschränkter Haftung | Schaltung zur ansteuerung einer leuchtstofflampe, verfahren zum betreiben der schaltung sowie system umfassend die schaltung |
| EP1343360A3 (de) * | 2002-03-05 | 2011-03-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Betriebsschaltung für Entladungslampe mit EOL-Früherkennung |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6979959B2 (en) | 2002-12-13 | 2005-12-27 | Microsemi Corporation | Apparatus and method for striking a fluorescent lamp |
| US7405522B2 (en) * | 2003-08-26 | 2008-07-29 | Q Technology, Inc. | Multiple failure detection shutdown protection circuit for an electronic ballast |
| US7598677B2 (en) * | 2003-08-26 | 2009-10-06 | Q Technology, Inc. | Multiple failure detection shutdown protection circuit for an electronic ballast |
| US7187139B2 (en) | 2003-09-09 | 2007-03-06 | Microsemi Corporation | Split phase inverters for CCFL backlight system |
| US7183727B2 (en) | 2003-09-23 | 2007-02-27 | Microsemi Corporation | Optical and temperature feedbacks to control display brightness |
| US7468722B2 (en) | 2004-02-09 | 2008-12-23 | Microsemi Corporation | Method and apparatus to control display brightness with ambient light correction |
| US7112929B2 (en) | 2004-04-01 | 2006-09-26 | Microsemi Corporation | Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system |
| US7755595B2 (en) | 2004-06-07 | 2010-07-13 | Microsemi Corporation | Dual-slope brightness control for transflective displays |
| DE102005013898A1 (de) * | 2005-03-24 | 2006-09-28 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung zum Betrieb mindestens einer ersten und einer zweiten darin einsetzbaren Lampe |
| DE102005028419A1 (de) * | 2005-06-20 | 2006-12-28 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Abschaltschaltung |
| US7414371B1 (en) | 2005-11-21 | 2008-08-19 | Microsemi Corporation | Voltage regulation loop with variable gain control for inverter circuit |
| US7569998B2 (en) | 2006-07-06 | 2009-08-04 | Microsemi Corporation | Striking and open lamp regulation for CCFL controller |
| DE102006036293A1 (de) * | 2006-08-03 | 2008-02-14 | Cooper Crouse-Hinds Gmbh | Überwachungsvorrichtung |
| US8093839B2 (en) | 2008-11-20 | 2012-01-10 | Microsemi Corporation | Method and apparatus for driving CCFL at low burst duty cycle rates |
| US8487541B2 (en) * | 2010-10-11 | 2013-07-16 | General Electric Company | Method to ensure ballast starting regardless of half cycle input |
| US8810146B1 (en) | 2011-11-04 | 2014-08-19 | Universal Lighting Technologies, Inc. | Lighting device with circuit and method for detecting power converter activity |
| DE102012207002A1 (de) * | 2011-12-23 | 2013-06-27 | Tridonic Gmbh & Co. Kg | Verfahren, Betriebsgerät und Beleuchtungssystem |
| CN103369770B (zh) * | 2012-03-31 | 2016-09-07 | 海洋王照明科技股份有限公司 | 灯具过温保护电路及装置 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4425859A1 (de) * | 1994-07-21 | 1996-01-25 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen |
| US5783911A (en) * | 1995-07-12 | 1998-07-21 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating electric lamps, and operating method for electric lamps |
| JPH0935512A (ja) | 1995-07-25 | 1997-02-07 | Matsushita Electric Works Ltd | 無電極放電灯点灯装置 |
| DE19548506A1 (de) * | 1995-12-22 | 1997-06-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb einer Lampe |
| DE19612170A1 (de) * | 1996-03-27 | 1997-10-02 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb von elektrischen Lampen und Betriebsverfahren für elektrische Lampen |
| US5808422A (en) * | 1996-05-10 | 1998-09-15 | Philips Electronics North America | Lamp ballast with lamp rectification detection circuitry |
| US5770925A (en) * | 1997-05-30 | 1998-06-23 | Motorola Inc. | Electronic ballast with inverter protection and relamping circuits |
| FI102347B1 (fi) * | 1997-06-18 | 1998-11-13 | Helvar Oy | Lampun tasasuuntauksen tunnistuspiirillä varustettu elektroninen liitäntälaite |
| DE19830368A1 (de) * | 1998-07-07 | 2000-02-03 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Elektronisches Vorschaltgerät mit Einschaltstrombegrenzung |
| DE19837728A1 (de) * | 1998-08-20 | 2000-02-24 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe |
-
2001
- 2001-02-20 DE DE10108138A patent/DE10108138A1/de not_active Withdrawn
-
2002
- 2002-01-17 AT AT02001285T patent/ATE368367T1/de not_active IP Right Cessation
- 2002-01-17 EP EP02001285A patent/EP1233657B1/de not_active Expired - Lifetime
- 2002-01-17 DE DE50210534T patent/DE50210534D1/de not_active Expired - Lifetime
- 2002-02-07 TW TW091102178A patent/TW540255B/zh not_active IP Right Cessation
- 2002-02-11 US US10/068,894 patent/US6650514B2/en not_active Expired - Fee Related
- 2002-02-19 CA CA002373571A patent/CA2373571A1/en not_active Abandoned
- 2002-02-20 CN CNB021046891A patent/CN100477880C/zh not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1343360A3 (de) * | 2002-03-05 | 2011-03-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Betriebsschaltung für Entladungslampe mit EOL-Früherkennung |
| WO2008119376A1 (de) * | 2007-03-29 | 2008-10-09 | Osram Gesellschaft mit beschränkter Haftung | Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe |
| WO2008128565A1 (de) * | 2007-04-19 | 2008-10-30 | Osram Gesellschaft mit beschränkter Haftung | Schaltung zur ansteuerung einer leuchtstofflampe, verfahren zum betreiben der schaltung sowie system umfassend die schaltung |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2373571A1 (en) | 2002-08-20 |
| TW540255B (en) | 2003-07-01 |
| EP1233657A3 (de) | 2006-05-24 |
| CN100477880C (zh) | 2009-04-08 |
| DE50210534D1 (de) | 2007-09-06 |
| US20020114114A1 (en) | 2002-08-22 |
| DE10108138A1 (de) | 2002-08-29 |
| US6650514B2 (en) | 2003-11-18 |
| ATE368367T1 (de) | 2007-08-15 |
| EP1233657B1 (de) | 2007-07-25 |
| CN1374824A (zh) | 2002-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1233657B1 (de) | Schutzschaltung für eine Leuchtstofflampe | |
| DE10196562B4 (de) | Vorschaltgerät für den Betrieb einer Entladungslampe | |
| DE69119152T2 (de) | Schaltungsanordnung | |
| EP0240883A2 (de) | Verfahren zur Erzielung eines Tiefentladeschutzes für eine wiederaufladbare Batterie und Schaltungsanordnung zur Durchführung des Verfahrens | |
| EP0800335A2 (de) | Schaltungsanordnung zum Betrieb elektrischer Lampen | |
| EP0054301B1 (de) | Zündvorrichtung für eine Niederdruckentladungslampe | |
| DE3883042T2 (de) | Einrichtung zum Ermöglichen der Wiederherstellung des Stroms einer Leitung im Falle des Durchschlagens eines oder mehrerer Elemente einer Serienschaltung. | |
| EP2138015B1 (de) | Schaltungsanordnung zum erzeugen einer hilfsspannung und zum betreiben mindestens einer entladungslampe | |
| EP0732869A2 (de) | Verfahren und Schaltungsanordnung zum Betrieb einer Entladungslampe | |
| DE69616451T2 (de) | Umschaltanordnung | |
| DE3022773C2 (de) | ||
| DE3622984C2 (de) | ||
| EP0212740A2 (de) | Schaltungsanordnung zum Starten und Betrieb von Gasentladungslampen | |
| EP0534280A1 (de) | Vorschaltgerät zum Starten und Betreiben von Hochdruck-Gasentladungslampen | |
| DE2425720A1 (de) | Vorschaltgeraet fuer entladungslampen | |
| EP0881864B1 (de) | Schaltungsanordnung zum Betreiben elektrischer Glühlampen | |
| DE19532677B4 (de) | Überwachungsschaltung für wenigstens eine Versorgungsspannung | |
| DE69315640T2 (de) | Verzögerungsmittel in einer Anlaufschaltung eines Vorschaltgerätes | |
| DE10252836A1 (de) | Vorrichtung zum Betreiben von Entlaudungslampen | |
| EP1858304B1 (de) | Elektronisches Vorschaltgerät und Verfahren zur Inbetriebsnahme eines elektronisches Vorschaltsgeräts | |
| DE102004042771B4 (de) | Schaltungsanordnung und Verfahren zum Dimmen von mindestens einer Lampe | |
| DE2526183C2 (de) | Schaltungsanordnung zum Schnelladen eines Akkumulators mit einem pulsierenden Strom | |
| EP2140735B1 (de) | Schaltungsanordnung zum zünden und betreiben mindestens einer entladungslampe | |
| DE3786501T2 (de) | Schaltung zur Begrenzung von Überspannungen in gleichstrombetriebenen Lampen. | |
| DE4101963C1 (en) | Protective circuit counteracting mains interference pulses - has compensating capacitor with voltage rising at most to half max. interference voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| 17P | Request for examination filed |
Effective date: 20060710 |
|
| AKX | Designation fees paid |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: CH Ref legal event code: NV Representative=s name: SIEMENS SCHWEIZ AG |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20070810 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
| REF | Corresponds to: |
Ref document number: 50210534 Country of ref document: DE Date of ref document: 20070906 Kind code of ref document: P |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
| ET | Fr: translation filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070725 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071226 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071105 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070725 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071026 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070725 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20080428 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080131 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PCAR Free format text: SIEMENS SCHWEIZ AG;INTELLECTUAL PROPERTY FREILAGERSTRASSE 40;8047 ZUERICH (CH) |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080117 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070725 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080117 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070725 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20110107 Year of fee payment: 10 Ref country code: NL Payment date: 20110125 Year of fee payment: 10 Ref country code: IT Payment date: 20110126 Year of fee payment: 10 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 50210534 Country of ref document: DE Owner name: OSRAM GMBH, DE Free format text: FORMER OWNER: OSRAM GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG, 81543 MUENCHEN, DE Effective date: 20111128 |
|
| REG | Reference to a national code |
Ref country code: NL Ref legal event code: V1 Effective date: 20120801 |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120118 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120117 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120801 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 50210534 Country of ref document: DE Owner name: OSRAM GMBH, DE Free format text: FORMER OWNER: OSRAM AG, 81543 MUENCHEN, DE Effective date: 20130205 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 50210534 Country of ref document: DE Owner name: OSRAM GMBH, DE Free format text: FORMER OWNER: OSRAM GMBH, 81543 MUENCHEN, DE Effective date: 20130822 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20140121 Year of fee payment: 13 Ref country code: BE Payment date: 20140121 Year of fee payment: 13 Ref country code: DE Payment date: 20140122 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20140123 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20140121 Year of fee payment: 13 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150131 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50210534 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20150117 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150131 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150801 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150131 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150117 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150930 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150202 |