EP2468078A1 - Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe - Google Patents
Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampeInfo
- Publication number
- EP2468078A1 EP2468078A1 EP10776646A EP10776646A EP2468078A1 EP 2468078 A1 EP2468078 A1 EP 2468078A1 EP 10776646 A EP10776646 A EP 10776646A EP 10776646 A EP10776646 A EP 10776646A EP 2468078 A1 EP2468078 A1 EP 2468078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge lamp
- coupled
- electronic ballast
- control device
- electronic
- 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
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 230000003213 activating effect Effects 0.000 claims abstract 2
- 238000004804 winding Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 101100495769 Caenorhabditis elegans che-1 gene Proteins 0.000 claims 1
- 238000013461 design Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 241001296096 Probles Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002565 electrocardiography Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
Definitions
- the present invention relates to an electronic ballast for operating at least a discharge lamp with an input having a first and a second input terminal for coupling to a supply ⁇ DC voltage, an output having a first and a second output terminal for coupling to the at least one discharge lamp, bridge circuit having any artwork least a first and a second electronic switch, a series circuit of the first and the second electronic switch to form a first bridge center point between the first and coupled to the two ⁇ th input terminal, a lamp ballast, the first between the bridge center point and coupled to at least one trapezoid ⁇ capacitor, which is coupled in parallel to one of the electronic switch, a resonant capacitor which is coupled in parallel to the first and second output terminal, a control device ung for driving at least the first and the second electronic switch with a drive signal, said drive signal of between the first and connected to the second output terminal of the discharge lamp comprises currency ⁇ end of a preheating phase, a first and a second coil at least ei ⁇ ne operating frequency, wherein
- Proble ⁇ matics results from the design of so-called multi- tilampen ECGs (electronic ballast), that is, electronic ballasts for the operation of different discharge lamps, in particular low pressure discharge lamps.
- ECGs electronic ballasts
- the power range of the discharge lamps that can be operated with it ranges from 14 W to 80 W.
- the filaments of the at least one discharge lamp connected to the electronic ballast are heated during a preheating phase. Shortly before the start of the ignition phase, the heating of the coils is switched off.
- the control device is realized in known generic electronic ballast, the control device as an ASIC (Applica- tion specific integrated circuit), whereby such integrated circuit operates as a so-called status machine. After that states can only be serially worked from ⁇ , here therefore first phase, the preheat, then the ignition phase.
- the DC supply voltage is independent of the respectively connected discharge lamp, the only possibility for adaptation to the respective closed discharge lamp is to vary the operating frequency of the drive signal for the first and second elekt ⁇ ronic switch.
- the spectrum of the operating frequencies in the mentioned example ranges from 90 kHz (for 14 W lamps) to 45 kHz (for 80 W lamps).
- the resonance capacitor is chosen to be small, for example 2.2 nF, in order to generate the least possible losses. Since in generic electronic ballasts with particularly high efficiency preferably active components, in particular the control device, from an AC voltage source in the load circuit, preferably the trapezoidal capacitor, are supplied with energy, this is to be dimensioned so that it at the lower limit frequency, ie in the example . provides 45 kHz, suffi ⁇ accordingly current. It should therefore be mög ⁇ lichst large dimensions; in the example about 1 nF.
- the ratio of the capacitance of the resonant capacitor to the capacitance of the trapezoidal capacitor determines the steep flank of the integral of the voltage U HBM on the first bridge means ⁇ point of the bridge circuit.
- curve 1) shows the trace for a large-called Ver ⁇ ratio
- curve 2) for a small-called behaves ⁇ nis.
- the period of time is reduced when curve 2) ts2 compared with the period t S i.
- the period t S2 when operating at high frequencies is the period t S2 when operating at high frequencies.
- the switches of the bridge circuit for the purpose of preheating and ignition must be operated at a significantly higher frequency than as for the above-mentioned normal operation.
- the frequency during the heating of the filaments of the discharge lamp must not be too low, otherwise there is a risk of pre-ignition when the OCV (Open Circuit Voltage) of the discharge lamp is exceeded.
- OCV Open Circuit Voltage
- the present invention is therefore based on the object of further developing a generic electronic ballast or a generic method such that a reliable switch-relieved operation can be ensured with the lowest possible losses, in particular also in the ignition phase of the discharge lamp.
- the present invention is based on the finding that a safe swing, corresponding to a reliable switch-unloaded operation, even with a small ratio of capacitance of the resonant capacitor to capacitance of the trapezoidal capacitor can be ensured if in the load circuit of the electronic ballast, that in particular by the lamp inductor , always one sufficiently large current flows, which provides the necessary reactive ⁇ energy for the swinging of the bridge circuit.
- a more detailed analysis of the procedure in the prior art leads to the realization that there due to the switching off of the consumer, ie fed from the load circuit helical heating, before the start of the ignition phase of the discharge lamp leads to a rapid drop in the load circuit existing reactive energy. This is the root cause of the problems of the state of the art.
- the heating of the filaments remains activated beyond the beginning of the ignition phase, there is no dip in the power consumption from the load circuit since the heating device is still supplied from it. Accordingly, there is enough reactive energy for a reliable switching of the bridge circuit available.
- the bridge circuit was still operated during the pre-heating circuit relieved, since energy was consumed by the heating of the coils in the prior art.
- the heating was - before the start of the ignition phase ⁇ - off. This was in the output circuit consumes kei ⁇ ne performance because the discharge lamp had not yet been ignited. Due to the lack of power ⁇ decrease the current through the lamp inductor was small and thus in the load circuit little reactive energy available. This prolonged the swinging of the current through the lamp choke. This could lead to such an extent that the clamping voltage ⁇ UHBM no longer was on the first bridge center point zero. The switches of the bridge circuit switched with this no longer relieved switching. In the bridge circuit Flös ⁇ sen cross currents with appropriate monitoring even could lead to the shutdown of the electronic ballast.
- Another advantage of an electronic ballast according to the invention is that it also allows Lam ⁇ penersatzwiderand without takeover problem can be operated, as by the invention load jumps after preheating in conjunction with high operating frequencies of Bridge circuit can be reliably prevented by the continued operation of the heater.
- the heating of the coils is maintained until the discharge lamp has ignited.
- a sufficiently large current in the output circuit which reduces the Umschwing practitioner and ge ⁇ ensures that the switches of the bridge circuit are operated switching relieved.
- the predetermined period of time from the beginning of the reduction of the operating frequency is at least 20 ms, preferably at least 50 ms, more preferably at least 100 ms.
- the duration of the predetermined period of time at the speed is correlated with the operating frequency is lowered Even a brief overlap of the heating and the ignition phase brings advantages in terms of a Improvement ⁇ tes reoscillation of the bridge circuit of the electronic ballast. This tends to be further improved by extending the period.
- the predetermined period of time is such that it extends until after the time of ignition of the discharge lamp.
- the operating frequency is between 100 and 150 kHz.
- the Radio frequency is between 50 and 100 kHz.
- the control device is preferably designed to Be ⁇ operating frequency after ignition of the discharge lamp to a Set nominal frequency. This can be between 40 and 95 kHz.
- the electronic ballast may further comprise an auxiliary voltage source, which is coupled to its supply, in particular using a charge pump, with a trapezoidal capacitor.
- auxiliary voltage source which is coupled to its supply, in particular using a charge pump, with a trapezoidal capacitor. This provides a possibility of realizing with particular low loss a voltage source whose amplitude is significantly lower than that of the DC supply voltage.
- the control device ⁇ is particularly preferred as mentioned, coupled to its supply to the auxiliary voltage source.
- control device may be designed to deactivate the heating device as soon as an ignition of the discharge lamp can be detected. Ignition of Entla pressure discharge lamp can be determined easily by monitoring the lamp voltage. Since after ignition of the lamp in the load circuit, a large current flows, so a consumer is present, the heater can be easily switched off without jeopardizing a safe swinging the bridge circuit.
- 1 is a schematic representation of the time course of the voltage U HBM at the first bridge center with different dimensions of the resonant capacitor according to the prior art.
- FIG. 2 is a schematic representation of the structure of a generic electronic ballast.
- Fig. 3 shows the time course of various electrical
- Figure 4 shows the time course of the operating frequency in presence control signal of the electronic switches of the bridge circuit of the circuit arrangement of Figure 2, in one embodiment a erfindungsge ⁇ zeßem interpretation..;
- Fig. 5 shows the time course of various electrical
- Fig. 2 shows a schematic representation of the structure of an electronic ballast. This structure is in and of itself known from the prior art, wherein the invention is reflected in a, in Fig. 2 initially not recognizable interpretation of yet to be introduced control device 12.
- the electronic ballast shown in FIG. 2 comprises an input with a first El and a second input terminal E2, between which a DC supply voltage, preferably the so-called intermediate circuit voltage U Zw , is applied.
- a storage capacitor Ci is connected in parallel with the input.
- the storage capacitor Ci supplies an inverter 10, which comprises a bridge scarf ⁇ processing which is presently re ⁇ alinstrument as a half-bridge arrangement. This in turn comprises the series switching ⁇ device of an electronic switch Sl and an electronic switch S2, between which a first half-bridge center HBM1 is formed, and two coupling ⁇ capacitors C KI and C K2 , between which a second half-bridge center HBM2 is formed.
- a lamp ⁇ choke LI is coupled between the first half-bridge center point HBM1 and a first output terminal AI of the electronic ballast.
- a second output terminal A2 is coupled to the second half-bridge center HBM2.
- a discharge lamp La is coupled, which comprises a first Wl and a second coil W2.
- a trapezoidal capacitor C T is coupled.
- a resonant capacitor C R is coupled between the first output terminal AI and the reference potential, which in the present case represents the second input terminal E2.
- the electronic ballast further comprises a control device 12, which via an output AL, the switch S2 and via an output AH controls the switch Sl with a drive signal having an operating frequency.
- the electronic ballast shown in Fig. 2 further comprises a heater.
- the series connection of the primary winding La of a transformer TR, a capacitor C2 and an electronic switch S3 is coupled between the first half-bridge center HBM1 and the reference potential.
- a first secondary winding Lbl is coupled to the first filament Wl of the discharge lamp La
- a second secondary winding Lb2 is coupled to the second filament W2 of the discharge lamp La.
- the switch S3 is also controlled by the control ⁇ device 12 and via an output AS3. Accordingly, if the switch S3 is turned on, a current flows through the primary winding La of the transformer Tr, whereby a current flow through the respective secondary winding Lbl, Lb2 is generated. This leads to egg ⁇ nem heating of the coils Wl, W2 of the discharge lamp La.
- auxiliary voltage source U H To realize an auxiliary voltage source U H , a half-wave rectifier comprising the diodes D 1 and D 2 is coupled to the trapezoidal capacitor C T. To integrate the voltage provided at the output of the rectifier D1, D2, a capacitor C3 is used, to which a Zener diode ZI is connected in parallel.
- the auxiliary voltage source U H is coupled to the terminal VCC of the control device 12 and supplies them with energy.
- the voltage drop across the output terminals AI, A2 is denoted by U La , the current flowing through the lamp inductor LI with I L i, which activates the switch S3. ernde current with I G and the s3 flows through the switch S2 ⁇ sequent stream I s2.
- FIG. 3 shows the time profile of the variables I G s3 / U La , I L I, I S 2 in a design of the electronic ballast according to FIG. 2 according to the prior art, FIG. 3b showing a section of FIG. 3a shortly after the time ti in a significantly enlarged resolution shows.
- the switch S3 is switched off at the time t 1, whereby the preheating of the coils W 1, W 2 is terminated.
- the operating frequency of the switches S 1, S 2 is reduced continuously, as a result of which one approaches the resonance frequency of the load circuit from above, ie from higher frequencies.
- This leads to an increase in the voltage U La which leads to the ignition of the discharge lamp La at the time t 2 .
- the increase of the voltage U La during the period between ti and t 2 is correlated with an increase of the current I s2 . After ignition of the discharge lamp La at time t 2 , the current I Li increases significantly.
- the current I.sub.s2 has current peaks which are an indication that the switches S1, S2 of the half-bridge arrangement are not switched softly, that is, they are not switched-relieved. If the current I s2 is measured, as usual, for example using a shunt resistor, and the voltage dropping across the shunt resistor is fed to the control device 12, the detection of such current peaks can lead to a shutdown of the electronic ballast.
- 4 shows the time profile of the operating frequency in the drive signals, which are provided at the outputs AH, AL of the control device 12 to the switches S 1, S 2 in a design according to the invention of the electronic ballast according to FIG. 2.
- the operating frequency f up to the time ti the value Fheat / the Fre acid sequence commonly used for preheating.
- the operating frequency f is gradually decreased, until time t 2, the ignition of the discharge lamp La he ⁇ follows. Then the operating frequency f is lowered to a nominal frequency f nom .
- the ignition phase extends in the present case over the period of time which lies between t 2 and t 1 and is denoted herein by T z .
- the switch S3 was turned off at the time ti, in this case extends the heating phase T he at beyond the time ti; it may, as indicated by the dotted line, even extend beyond the time t 2 out.
- FIG. 4 which is illustrated in FIG. 2
- the beginning of the ignition phase is again identified by ti, the time ⁇ point of ignition with t 2 .
- FIG. 5b shows, in an enlarged resolution, the area of FIG. 5a marked in particular, shortly before the ignition of the discharge lamp La in enlarged resolution.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009053617A DE102009053617A1 (de) | 2009-11-17 | 2009-11-17 | Elektronisches Vorschaltgerät und Verfahren zum Betreiben mindestens einer Entladungslampe |
| PCT/EP2010/066673 WO2011061053A1 (de) | 2009-11-17 | 2010-11-03 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2468078A1 true EP2468078A1 (de) | 2012-06-27 |
| EP2468078B1 EP2468078B1 (de) | 2016-08-17 |
Family
ID=43661955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10776646.1A Not-in-force EP2468078B1 (de) | 2009-11-17 | 2010-11-03 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2468078B1 (de) |
| KR (1) | KR20120005923U (de) |
| CN (1) | CN202857113U (de) |
| DE (1) | DE102009053617A1 (de) |
| WO (1) | WO2011061053A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5656891A (en) * | 1994-10-13 | 1997-08-12 | Tridonic Bauelemente Gmbh | Gas discharge lamp ballast with heating control circuit and method of operating same |
| DE19520999A1 (de) * | 1995-06-08 | 1996-12-12 | Siemens Ag | Schaltungsanordnung zur Wendelvorheizung von Leuchtstofflampen |
| DE29514817U1 (de) * | 1995-09-15 | 1995-11-16 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München | Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe |
| CN1589593A (zh) * | 2001-11-23 | 2005-03-02 | 皇家飞利浦电子股份有限公司 | 加热放电灯的电极的设备 |
| DE102005013564A1 (de) * | 2005-03-23 | 2006-09-28 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Lampe |
| DE102006010996A1 (de) * | 2006-03-09 | 2007-09-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektronisches Vorschaltgerät und Verfahren zum Betreiben einer elektrischen Lampe |
| EP2138017B1 (de) * | 2007-04-23 | 2011-06-15 | Osram Gesellschaft mit beschränkter Haftung | Schaltanordnung zum betreiben einer niederdruck-gasentladungslampe |
-
2009
- 2009-11-17 DE DE102009053617A patent/DE102009053617A1/de not_active Withdrawn
-
2010
- 2010-11-03 EP EP10776646.1A patent/EP2468078B1/de not_active Not-in-force
- 2010-11-03 KR KR2020127000035U patent/KR20120005923U/ko not_active Ceased
- 2010-11-03 CN CN2010900013079U patent/CN202857113U/zh not_active Expired - Fee Related
- 2010-11-03 WO PCT/EP2010/066673 patent/WO2011061053A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011061053A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2468078B1 (de) | 2016-08-17 |
| CN202857113U (zh) | 2013-04-03 |
| DE102009053617A1 (de) | 2011-05-19 |
| WO2011061053A1 (de) | 2011-05-26 |
| KR20120005923U (ko) | 2012-08-22 |
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