EP1280388B1 - Elektronisches Vorschaltgerät mit Vorheizbetrieb - Google Patents
Elektronisches Vorschaltgerät mit Vorheizbetrieb Download PDFInfo
- Publication number
- EP1280388B1 EP1280388B1 EP02012639A EP02012639A EP1280388B1 EP 1280388 B1 EP1280388 B1 EP 1280388B1 EP 02012639 A EP02012639 A EP 02012639A EP 02012639 A EP02012639 A EP 02012639A EP 1280388 B1 EP1280388 B1 EP 1280388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control circuit
- circuit
- failure
- supply voltage
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
- H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2983—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal power supply conditions
-
- 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 an electronic ballast for operation at least one gas discharge lamp according to the preamble of claim 1.
- the ignition of a gas discharge lamp provides for their coils a relatively high load. To keep this load nevertheless as low as possible the lamp filaments usually preheated before the ignition of the lamp, since the Ignition process for the coils is gentler, if they already have a certain temperature exhibit. In this case, a heating current is applied to the coils for a short period of time created. Only when this has reached a suitable temperature, is the Lamp applied the ignition voltage required for ignition. Modern ballasts are usually designed to automatically perform such a preheat cycle before each ignition of the lamp.
- the lamp was turned off only for a very short time, for example in case of a temporary failure of the power supply for the ballast, so you want the lamp as soon as possible after the power is restored start anew. Often the lamp filaments still have one at this time sufficiently high temperature that would allow an immediate reignition, so that by preheating unnecessary time would be consumed. It also puts in In this case, preheating the lamp filaments besides a loss of time also unnecessary energy consumption, with this problem both in the Return of the normal supply voltage after a short-term failure as well as when switching on an emergency power supply results.
- WO 99/34648 A1 discloses an electronic ballast which has a Control circuit, which in the event of a power failure, the duration of the power failure determined. Exceeds the duration of the power failure a predetermined maximum time, the lamp filaments after one Return the power preheated before the lamp re-ignited However, the duration of the power failure is shorter than the maximum time, so Prevents the lamp filaments from preheating and ignites the lamp immediately.
- the determination of the duration of the power failure takes place in the above WO 99/34648 A1 characterized in that an RC circuit connected to the control circuit according to an ignition of the lamp to a certain supply voltage potential is charged. If the power supply fails at a later time, then the capacitor with a predetermined by the elements of the RC element and thus discharged known dynamics. Upon return of the power supply determines the Control circuit compares the voltage still applied to the capacitor and this with a reference value, the predetermined maximum duration, up to the no Preheat is to be performed, corresponds. Is that due to the capacitor of the RC element voltage applied above the reference voltage, so is the Gas discharge lamp ignited instantly, however, the voltage is below of the reference value, a regular lamp start is performed with preheat operation.
- the control circuit receives as well as the other Components of the electronic ballast for the duration of the power failure none Energy and is thus completely deactivated. Accordingly, to determine the duration of the power failure an external element - such as the RC element - used, but for this purpose, however, relatively is expensive. Rather, there is a need to such an external element Avoid and determine the duration of the power failure in the To integrate control circuit itself.
- the present invention is therefore based on the object, an electronic To make ballast for operating a gas discharge lamp such that a Control circuit for controlling the operation of the gas discharge lamp without the Using an external element is capable of the duration of a temporary power failure.
- the ballast according to the invention comprises a rectifier circuit connected to a Supply voltage can be connected, one to the output of the rectifier circuit connected smoothing circuit for generating a DC link voltage, a Energy storage element, which is fed with the intermediate circuit voltage, a Inverter connected to the energy storage element, at the output of a Connection for the lamp-containing load circuit is connected, as well as a Control circuit for controlling the operation of the gas discharge lamp.
- the control circuit starts the gas discharge lamp after a temporary failure of the Supply voltage depending on the duration of this failure with either one Pre-heating operation for preheating the lamp filaments or without preheating operation. For this It monitors the state of the supply voltage and sets when detecting a Failure of the supply voltage silences the inverter for the duration of the failure.
- control circuit preferably applies after a failure of the supply voltage even the smoothing circuit still, to the power consumption of the entire electronic Ballast to minimize.
- the smoothing circuit is preferably a switching regulator, in particular a boost converter, the Energy storage element is preferably formed by a storage capacitor.
- a particularly advantageous embodiment of the ballast according to the invention is that the control circuit at least in terms of monitoring the time duration of a power failure works digitally.
- the control circuit has an analog / digital converter on the input side, which the the Smoothing circuit supplied rectified supply voltage in a Digital value. Within the control circuit this becomes digital Operating parameters compared to a reference value, wherein the control circuit the Inverter immediately shuts off when the internal reference value falls below becomes.
- a digitally configured timer circuit is provided which measures the duration of the power failure.
- the ballast is connected on the input side via a high-frequency filter 1 to the mains supply voltage U 0 .
- a rectifier circuit 2 in the form of a full-bridge rectifier, which converts the mains supply voltage U 0 in a rectified input voltage U i for the smoothing circuit 3.
- the smoothing circuit 3 in turn serves for harmonic filtering and smoothing of the input voltage U i and for this purpose comprises a smoothing capacitor C1 and an inductor L1, a controllable switch in the form of a MOS field effect transistor S1 and a diode D1 having boost converter.
- boost converter shown here, other switching regulators can be used.
- an intermediate circuit voltage U Z applied across the storage capacitor C2 adjoining the smoothing circuit 3 is generated, which is supplied to the inverter 4.
- the inverter 4 is formed by two arranged in a half-bridge arrangement MOS field effect transistors S2 and S3, wherein an alternating voltage is generated by a high frequency driving these two field effect transistors S2, S3 at the center tap, which is supplied to the load circuit 5 with the gas discharge lamp LA connected thereto. This is done in a known manner and should therefore not be further explained below.
- the driving of the three MOS field effect transistors S1 to S3 of the smoothing circuit 3 and the inverter 4 is performed by a control circuit 6, which corresponding Switching information generated and connected to a to the control circuit 6 Driver circuit 7 transmitted.
- the driver circuit 7 sets the switching information in corresponding control signals and controls over the lines 14 to 16, the gates of three MOS field effect transistors S1 to S3 on.
- the load circuit 5 contains in particular two heating circuits H1 and H2, in each of which a the two coils W1, W2 of the gas discharge lamp LA is arranged. To the pre-heating both coils W1, W2 before igniting the gas discharge lamp LA, a corresponding heating current is applied to the two heating circuits H1, H2.
- the two coils W1 and W2 the ohmic resistors heated up until they reach a temperature at which the lamp LA ignited with the lowest possible load for the two coils W1, W2 can be.
- the control circuit 6 is supplied via the line 12 with the supply voltage rectified by the rectifier 2, which represents the input voltage U i for the smoothing circuit 3.
- the analog input signal is converted by a located in the control circuit 6 analog / digital converter ADC into a digital signal, a the analog / digital converter ADC downstream voltage detection block 8 compares the digital value with a predetermined reference value.
- the voltage detection block 8 and the other components of the Control circuit 6 operate completely digital, whereby a greatest possible integration of the various functions is achieved.
- a central clock 9 is provided which generates a clock signal and transmitted to all components of the control circuit 6.
- the control circuit 6 Based on the performed by the voltage detection block 8 comparison between the input voltage U i for the smoothing circuit 3 corresponding digital value and the reference value, it is determined whether a proper power supply is present at the input of the electronic ballast. If the detected voltage U i falls below the reference value, this is interpreted as a failure of the power supply. The control circuit 6 then immediately transmits a corresponding signal to the driver circuit 7 in order to shut down the two MOS field-effect transistors S2, S3 of the inverter 4. As a result, further consumption of the energy stored in the storage capacitor C2 is immediately prevented by the inverter 4. In addition, the switch S1 of the boost converter is shut down.
- a possible immediate shutdown of the inverter 4 is important because the stored energy in the storage capacitor C2 during the failure of the power supply to the control circuit 6 is used.
- the storage capacitor C2 ensures the energy supply of the control circuit 6 as an energy storage element for the duration of the power failure. This is achieved in that the voltage applied to the storage capacitor C2 DC link voltage U Z via a supply line 13, in which a resistor R1 is, the control circuit 6 is supplied.
- the control circuit 6 is supplied.
- the functionality of the control circuit 6 is ensured at least for the period in which, after a return of the mains supply, no preheating operation is carried out for the lamp filaments W1 and W2 but the lamp LA is to be ignited instantaneously.
- timer circuit 10 determines which, for example, in Form of a digital counter can be formed after a failure of the Power supply voltage begins to count backwards. Alternatively, one would also be another embodiment of the timer circuit 10 possible.
- the signals of the current detection block 8 and the timer circuit 10 are fed to a control block 11, which performs a corresponding operation of the electronic ballast depending on the signals.
- the control block after a power failure for the instantaneous shutdown of the inverter 4 and the smoothing circuit 3. If later detected by the current detection block 8, the restoration of the power supply, the control block 11 provides for the duration of the power supply failure corresponding restart of the lamp LA , In particular, this means that a preheating of the lamp filaments W1, W2, is dispensed with when the supply voltage U 0 before the completion of the counting cycle of the timer circuit 10 returns. If, on the other hand, the end of the counting cycle has already been reached, a normal preheating operation is carried out before the lamp LA is ignited.
- FIG Block diagram summarized in Fig. 2 shows the different phases of Lamp operation represent.
- the first step 20 consists in switching on the Power supply voltage. Subsequently, in the subsequent blocks 21 and 22 an initialization of the entire ballast and a preheat the Lamp filaments performed. After completion of the preheat cycle takes place in step 23 the ignition of the lamp, which then in the normal operating state 24th located.
- This wait state 25 is characterized in that the smoothing circuit 3 and in particular the Inverter 4 of the ballast be shut down and the power supply of Control circuit 6 is performed by the storage capacitor C2.
- the control circuit 6 continuously checks whether the normal mains supply has been restored. If this is the case, the lamp is ignited immediately, avoiding the pre-heating cycle, but only if the mains supply returns within a specified period of time. In the waiting state 25, therefore, the elapsed time t since the power supply failure is determined. Corresponds to the elapsed time t a predetermined maximum value T max and thus was exceeded the allowable time for a restart without preheating, the control circuit goes into a second wait state 26 on.
- control circuit can also be such be formed so that they are the state of the lamp, immediately before the failure the power supply, "notes" and the lamp after restoration of the Power supply continues in exactly the same state.
- control circuit Due to the advantageous digital design of the control circuit, this can also be very compact and based on the use of an external element for measuring the Duration of power failure can be waived.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Description
- Fig. 1
- ein Schaltbild eines erfindungsgemäßen Vorschaltgeräts;
- Fig.2
- ein Blockdiagramm zur Erläuterung der Funktionsweise des in Fig 1 dargestellten elektronischen Vorschaltgeräts.
Claims (9)
- Elektronisches Vorschaltgerät zum Betreiben mindestens einer Gasentladungslampe (LA), mit
einer an eine Versorgungsspannung (U0) anschließbaren Gleichrichterschaltung (2),
einer an den Ausgang der Gleichrichterschaltung (2) angeschlossenen Glättungsschaltung (3) zum Erzeugen einer Zwischenkreisspannung (UZ),
einem mit der Zwischenkreisspannung (UZ) gespeisten Energiespeicherelement (C2),
einem mit dem Energiespeicherelement (C2) verbundenen Wechselrichter (4), an dessen Ausgang ein Anschlüsse für die Lampe (LA) enthaltender Lastkreis (5) angeschlossen ist,
sowie einer Steuerschaltung (6) zum Steuern des Betriebs der Gasentladungslampe (LA), die nach einem vorübergehenden Ausfall der Versorgungsspannung (U0) die Gasentladungslampe (LA) abhängig von der Dauer des Ausfalls entweder mit einem Vorheizbetrieb zum Vorheizen der Lampenwendeln der Gasentladungslampe (LA) oder ohne Vorheizbetrieb startet,
dadurch gekennzeichnet, daß die Steuerschaltung (6) den Zustand der Versorgungsspannung (U0) überwacht, wobei sie für die Dauer des Ausfalls der Versorgungsspannung (U0) den Wechselrichter (4) stillegt und gleichzeitig von dem Energiespeicherelement (C2) gespeist wird. - Elektronisches Vorschaltgerät nach Anspruch 1,
dadurch gekennzeichnet, daß die Steuerschaltung (6) nach einem Ausfall der Versorgungsspannung (U0) auch die Glättungsschaltung (3) stillegt. - Elektronisches Vorschaltgerät nach Anspruch 2,
dadurch gekennzeichnet, daß die Glättungsschaltung (3) durch einen Schaltregler gebildet wird, wobei die Steuerschaltung (6) nach dem Ausfall der Versorgungsspannung (U0) ein weiteres Schalten eines steuerbaren Schalters (S1) des Schaltreglers verhindert. - Elektronisches Vorschaltgerät nach Anspruch 3,
dadurch gekennzeichnet, daß der Schaltregler ein Hochsetzsteller ist. - Elektronisches Vorschaltgerät nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß das Energiespeicherelement ein Speicherkondensator (C2) ist. - Elektronisches Vorschaltgerät nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß die Steuerschaltung (6) die Gasentladungslampe (LA) mit einem Vorheizbetrieb startet, wenn die Dauer des Ausfalls der Versorgungsspannung (U0) eine vorgegebene Maximaldauer (Tmax) überschreitet. - Elektronisches Vorschaltgerät nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß die Steuerschaltung (6) zum Überwachen des Zustands der Versorgungsspannung (U0) die von dem Gleichrichter (2) abgegebene Eingangsspannung (Ui) für die Glättungsschaltung (3) erfaßt und mit einem Referenzwert vergleicht. - Elektronisches Vorschaltgerät nach Anspruch 7,
dadurch gekennzeichnet, daß die Steuerschaltung (6) einen Analog/Digital-Wandler (ADC) zum Umsetzen der erfaßten Eingangsspannung (Ui) in einen Digitalwert sowie einen Spannungserfassungsblock (8) aufweist, der den von dem Analog/Digital-Wandler (ADC) erzeugten Digitalwert mit einem digitalen Referenzwert vergleicht. - Elektronisches Vorschaltgerät nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß die Steuerschaltung zum Bestimmen der zeitlichen Dauer des Ausfalls der Versorgungsspannung (U0) eine digitale Timerschaltung (10) aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10134566A DE10134566A1 (de) | 2001-07-16 | 2001-07-16 | Elektronisches Vorschaltgerät mit Vorheizbetrieb |
DE10134566 | 2001-07-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1280388A1 EP1280388A1 (de) | 2003-01-29 |
EP1280388B1 true EP1280388B1 (de) | 2004-09-08 |
Family
ID=7691978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02012639A Expired - Lifetime EP1280388B1 (de) | 2001-07-16 | 2002-06-06 | Elektronisches Vorschaltgerät mit Vorheizbetrieb |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1280388B1 (de) |
AT (1) | ATE275811T1 (de) |
DE (2) | DE10134566A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005058574A1 (de) * | 2005-12-08 | 2007-06-14 | Hella Kgaa Hueck & Co. | Vorrichtung zum Steuern der Zusatzleistung einer Gasentladungslampe |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202005013754U1 (de) * | 2005-08-31 | 2005-11-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Vorschaltgerät für eine Entladungslampe mit adaptiver Vorheizung |
DE102005042527B4 (de) * | 2005-09-07 | 2015-10-29 | Osram Gmbh | Schaltungsanordnung und Verfahren zum Betreiben einer Entladungslampe |
US7834552B2 (en) | 2007-07-17 | 2010-11-16 | Infineon Technologies Austria Ag | Controlling a lamp ballast |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4018865A1 (de) * | 1990-01-20 | 1991-12-19 | Semperlux Gmbh | Elektronisches vorschaltgeraet zum betrieb von entladungslampen |
NL9301694A (nl) * | 1993-10-01 | 1995-05-01 | Cm Personnel Participation Bv | Electronische voorschakelinrichting voor gasontladingsbuizen. |
US5739645A (en) * | 1996-05-10 | 1998-04-14 | Philips Electronics North America Corporation | Electronic ballast with lamp flash protection circuit |
US6020689A (en) * | 1997-04-10 | 2000-02-01 | Philips Electronics North America Corporation | Anti-flicker scheme for a fluorescent lamp ballast driver |
AU1962499A (en) * | 1997-12-23 | 1999-07-19 | Tridonic Bauelemente Gmbh | Electronic lamp ballast |
-
2001
- 2001-07-16 DE DE10134566A patent/DE10134566A1/de not_active Withdrawn
-
2002
- 2002-06-06 EP EP02012639A patent/EP1280388B1/de not_active Expired - Lifetime
- 2002-06-06 AT AT02012639T patent/ATE275811T1/de active
- 2002-06-06 DE DE50200946T patent/DE50200946D1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005058574A1 (de) * | 2005-12-08 | 2007-06-14 | Hella Kgaa Hueck & Co. | Vorrichtung zum Steuern der Zusatzleistung einer Gasentladungslampe |
DE102005058574B4 (de) * | 2005-12-08 | 2016-03-24 | Hella Kgaa Hueck & Co. | Vorrichtung zum Steuern der Zusatzleistung einer Gasentladungslampe mit einem Oszillator, dessen Frequenz zum Ersetzen eines RC-Zeitgliedes geändert wird |
Also Published As
Publication number | Publication date |
---|---|
DE10134566A1 (de) | 2003-02-06 |
ATE275811T1 (de) | 2004-09-15 |
DE50200946D1 (de) | 2004-10-14 |
EP1280388A1 (de) | 2003-01-29 |
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