EP2208401A1 - Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer ersten und einer zweiten entladungslampe - Google Patents
Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer ersten und einer zweiten entladungslampeInfo
- Publication number
- EP2208401A1 EP2208401A1 EP07822414A EP07822414A EP2208401A1 EP 2208401 A1 EP2208401 A1 EP 2208401A1 EP 07822414 A EP07822414 A EP 07822414A EP 07822414 A EP07822414 A EP 07822414A EP 2208401 A1 EP2208401 A1 EP 2208401A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- threshold value
- discharge lamp
- lai
- ignition
- drive 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
- 238000000034 method Methods 0.000 title claims description 13
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 230000002596 correlated effect Effects 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001960 triggered effect 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
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/382—Controlling the intensity of light during the transitional start-up phase
Definitions
- the present invention relates to an electronic ballast for operating at least a first and a second discharge lamp with a bridge circuit comprising at least a first and a second electronic switch, wherein the input of the bridge circuit is coupled to a DC supply voltage, wherein the output of the bridge circuit with a first terminal for a first discharge lamp and a second terminal for a second discharge lamp, wherein the first and second terminals are connected in parallel with respect to the output of the bridge circuit, at least one first and one second ignitors, one in series with the other Discharge lamp arranged inductance and arranged parallel to the respective discharge lamp capacitance comprises, a current measuring device which is designed to provide at its output a signal with the actual value of the total current through the least ns first and second inductance is correlated, and a drive circuit.
- the latter has at least a first and a second output for driving at least the first and the second electronic switch, a first input, which is coupled to the output of the current measuring device, a threshold value setting device for specifying at least a first threshold value for the set value of the total current at least the first and the second inductance, the drive circuit having is set to control at least the first and the second electronic switch taking into account the first SChwell- value as a setpoint. It also relates to a method for operating at least a first and a second discharge lamp on such an electronic ballast.
- the present invention relates in particular to the problem that high and low pressure discharge lamps for ignition require high voltages. These voltages are generated by electronic ballasts using a series resonant circuit. In the case of two- or multi-lamp electronic ballasts, two or more parallel load circuits are often used. In the case of two-lamp electronic ballasts, by means of which the following invention is described by way of example, therefore, the bridge circuit must be designed for twice the current as in the operation of a single discharge lamp. Usually, both load circuits do not have exactly the same resonant frequency. This can cause one discharge lamp to fire earlier than the other. If this happens, the current in the load circuit with the ignited discharge lamp becomes significantly smaller.
- the present invention is therefore based on the object of developing an aforementioned electronic ballast or an initially mentioned method such that a dimensioning of the components involved for lower voltages is possible. This object is achieved by an electronic ballast with the features of claim 1 and by a method having the features of claim 8.
- the present invention is based on the finding that this object can be achieved if the electronic ballast further comprises an ignition detection device for detecting whether one of the discharge lamps has ignited.
- the drive circuit comprises a second input which is coupled to the ignition detection device, wherein the threshold value setting device is further designed to specify a second threshold value for the setpoint value of the total current through at least the first and the second inductance, wherein the second threshold value is smaller than the first threshold.
- the drive circuit is designed to actuate at least the first and the second switch, taking into account the first threshold value as the setpoint, after detecting the ignition of a discharge lamp by the ignition detection device, taking into account the second threshold value, before the ignition of a discharge lamp is detected by the ignition detection device.
- a preferred embodiment is characterized in that the drive circuit further comprises a comparator, which is designed to compare the actual value of the total current through at least the first and the second inductance with the respective desired value of this current.
- a comparator for example, the microcontroller AT90PWM2 the company Atmel can be used. By using a comparator, compliance with the setpoint can be monitored very closely. This makes it possible to realize a precise, cost-effective dimensioning of the components involved.
- the ignition detection device comprises a power measurement device configured to determine a magnitude correlated with the power output at the at least first and second ports.
- the measurement of the power provides a more reliable statement as to whether one of the involved lamps has ignited or not.
- the drive circuit is designed to control the actual value of the total current by varying the frequency of the signal with which at least the first and the second electronic switches are controlled.
- the drive circuit is furthermore preferably designed to control the frequency of the signal with which at least the first and the second electronic switches are actuated be further lowered after detecting the ignition of a discharge lamp.
- the drive circuit of an electronic ballast according to the invention is in particular designed so that a changeover from the first to the second threshold value in a period of time which is a maximum of 1 ms, preferably a maximum of 200 ⁇ s, can be made.
- the wording "taking into account the first or second threshold” takes into account the fact that in practice a slight exceeding of the respective threshold value may occur, since only the current through the lower electronic switch when the bridge circuit is implemented by a half bridge is evaluated for the current measurement
- the second threshold value is at most 80%, preferably at most 75% of the first threshold value.
- Fig. 1 shows a schematic representation of the structure of an electronic ballast according to the invention for operating a first LaI and a second discharge lamp La2.
- the ballast comprises a first El and a second terminal E2 for connection to connect to a mains voltage U N.
- a block 10 which includes a rectifier and components for EMC protection.
- a boost converter 12 which comprises an inductance L 1, a switch S 1, a diode D 1 and a capacitor C 1.
- the so-called intermediate circuit voltage U zw is provided on the one hand to a voltage divider Rl, R2, on the other hand to the two switches S2, S3 of a half-bridge.
- the signal picked up at the resistor R2 is fed to a unit 14 of a microcontroller 16, the unit 14 serving for the PFC (Power Factor Correction).
- the switch S 1 of the boost converter 12 is actuated in a manner known to the person skilled in the art with regard to the amplitude height of the voltage U zw sensed by the resistor R 2.
- the switches S2, S3 of the half-bridge are controlled via a drive generator 18 of the microcontroller 16.
- the half-bridge center HB is coupled via a coupling capacitor C2 to a first and a second load circuit.
- the first load circuit comprises the aforementioned lamp LaI and a series resonant circuit comprising an inductance L2 and a capacitor C3.
- the second load circuit comprises the lamp La2 and a series resonant circuit comprising an inductance L3 and a capacitor C4.
- a shunt resistor R3 is used to measure the current through the lower switch S3 of the half-bridge. For this purpose, the voltage drop across the resistor R3 is transmitted via an ohmic resistor R4 and a capacitor C4, which serve for averaging, to a device 20 for power measurement. It is used to determine the performance in addition to the current, the known intermediate circuit voltage U zw taken into account.
- the device 20 for power measurement is coupled on the output side to a control circuit 22 which fulfills two functions. It comprises a Schwellwertvorgabe- device, which specifies a threshold value for the setpoint value of the total current through the first L2 and the second inductance L3. This threshold value varies with respect to whether neither of the two lamps LaI, La2 has ignited or whether one of the two lamps LaI, La2 has already ignited. In the event that one of the lamps LaI, La2 has already ignited, the threshold value predefined by the control circuit 22 is significantly smaller than in the case in which neither of the two lamps LaI, La2 has yet fired.
- the respective setpoint value specified threshold value is compared with the current actual value in a comparator 24 of the microcontroller 22.
- the control circuit 22 also serves to specify the drive generator 18 a frequency with which the switches S2, S3 of the bridge circuit are to be controlled.
- the control circuit 22 is designed to further lower the frequency of the signal with which the switches S2, S3 are actuated after detection of the ignition of one of the discharge lamps LaI, La2.
- the drive generator 18 controls the switches S2, S3 starting with a start frequency.
- the latter is gradually lowered, the comparator 24 continuously comparing the current measured via the shunt resistor R3 with a first threshold value becomes. If this threshold value is reached, the ignition process is aborted and started again at the starting frequency. If, however, the lowering of the frequency leads to the ignition of one of the two discharge lamps LaI, La2, this is detected via the device 20 for power measurement, whereupon the control circuit 22 provides the comparator 24 with an absolute smaller threshold value. If a further lowering of the frequency with which the drive generator 18 applies the switches S2, S3 to ignite the second discharge lamp, the ignition process is ended. If, however, the lowering of the frequency does not lead to the ignition of the second discharge lamp, the frequency is lowered until the comparator 24 determines that the second, smaller magnitude threshold has been reached.
- the electronic ballast switches off.
- a network reset can be used to start a new ignition attempt.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2007/062117 WO2009059643A1 (de) | 2007-11-09 | 2007-11-09 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer ersten und einer zweiten entladungslampe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2208401A1 true EP2208401A1 (de) | 2010-07-21 |
| EP2208401B1 EP2208401B1 (de) | 2011-03-16 |
Family
ID=39708315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07822414A Not-in-force EP2208401B1 (de) | 2007-11-09 | 2007-11-09 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer ersten und einer zweiten entladungslampe |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8441200B2 (de) |
| EP (1) | EP2208401B1 (de) |
| JP (1) | JP4988931B2 (de) |
| KR (1) | KR101339031B1 (de) |
| CN (1) | CN101855944B (de) |
| AT (1) | ATE502511T1 (de) |
| DE (1) | DE502007006751D1 (de) |
| WO (1) | WO2009059643A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8487555B2 (en) * | 2011-05-11 | 2013-07-16 | Osram Sylvania Inc. | Bi-level lamp ballast |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8102364A (nl) * | 1981-05-14 | 1982-12-01 | Philips Nv | Elektrische inrichting voor het ontsteken en voeden van een van twee voorverhitbare elektroden voorziene gas- en/of dampontladingslamp. |
| US5309062A (en) * | 1992-05-20 | 1994-05-03 | Progressive Technology In Lighting, Inc. | Three-way compact fluorescent lamp system utilizing an electronic ballast having a variable frequency oscillator |
| JPH06151083A (ja) * | 1992-11-13 | 1994-05-31 | S I Electron:Kk | 蛍光灯点灯装置 |
| JPH0992478A (ja) * | 1995-09-27 | 1997-04-04 | Tec Corp | 放電灯点灯装置 |
| JP3713129B2 (ja) * | 1997-06-13 | 2005-11-02 | 松下電工株式会社 | 放電灯点灯装置 |
| JPH11102796A (ja) * | 1997-09-25 | 1999-04-13 | Matsushita Electric Works Ltd | 放電灯点灯装置 |
| JP3832053B2 (ja) * | 1997-10-28 | 2006-10-11 | 松下電工株式会社 | 放電灯点灯装置 |
| US5945788A (en) | 1998-03-30 | 1999-08-31 | Motorola Inc. | Electronic ballast with inverter control circuit |
| US6104146A (en) | 1999-02-12 | 2000-08-15 | Micro International Limited | Balanced power supply circuit for multiple cold-cathode fluorescent lamps |
| DE10205896A1 (de) * | 2002-02-13 | 2003-09-04 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Betriebsschaltung für Entladungslampe mit frequenzvariabler Zündung |
| JP2004228049A (ja) * | 2003-01-27 | 2004-08-12 | Matsushita Electric Works Ltd | 放電灯点灯装置および照明器具 |
| CN1802783A (zh) * | 2003-03-18 | 2006-07-12 | 国际整流器公司 | 高强度放电灯的镇流器电路 |
| CA2488764A1 (en) * | 2003-12-03 | 2005-06-03 | Universal Lighting Technologies, Inc. | High efficiency 4-lamp instant start ballast |
| US7098605B2 (en) * | 2004-01-15 | 2006-08-29 | Fairchild Semiconductor Corporation | Full digital dimming ballast for a fluorescent lamp |
| US7372215B2 (en) * | 2004-02-19 | 2008-05-13 | International Rectifier Corporation | Lamp ballast for circuit driving multiple parallel lamps |
| DE102004037389C5 (de) * | 2004-08-02 | 2014-04-10 | Infineon Technologies Ag | Verfahren zur Ansteuerung einer eine Leuchtstofflampe aufweisenden Last zur Optimierung des Zündvorganges |
| US8760081B2 (en) | 2005-08-02 | 2014-06-24 | Texas Instruments Incorporated | Systems and methods for backlight driving |
| JP4810994B2 (ja) * | 2005-11-25 | 2011-11-09 | パナソニック電工株式会社 | 放電灯点灯装置及び照明器具 |
| JP2007157602A (ja) * | 2005-12-08 | 2007-06-21 | Toshiba Lighting & Technology Corp | 高圧放電ランプ点灯装置および照明装置。 |
| DE502006004743D1 (de) | 2006-06-21 | 2009-10-15 | Osram Gmbh | Verfahren und EVG zum Zünden einer Entladungslampe |
| EP2067385A1 (de) | 2006-09-25 | 2009-06-10 | Osram Gesellschaft mit beschränkter Haftung | Schaltungsanordnung und verfahren zum zünden einer entladungslampe |
| US7528558B2 (en) * | 2007-05-11 | 2009-05-05 | Osram Sylvania, Inc. | Ballast with ignition voltage control |
-
2007
- 2007-11-09 AT AT07822414T patent/ATE502511T1/de active
- 2007-11-09 US US12/741,833 patent/US8441200B2/en not_active Expired - Fee Related
- 2007-11-09 WO PCT/EP2007/062117 patent/WO2009059643A1/de not_active Ceased
- 2007-11-09 JP JP2010532445A patent/JP4988931B2/ja not_active Expired - Fee Related
- 2007-11-09 EP EP07822414A patent/EP2208401B1/de not_active Not-in-force
- 2007-11-09 KR KR1020107012705A patent/KR101339031B1/ko not_active Expired - Fee Related
- 2007-11-09 CN CN2007801014724A patent/CN101855944B/zh not_active Expired - Fee Related
- 2007-11-09 DE DE502007006751T patent/DE502007006751D1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009059643A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101855944B (zh) | 2013-05-22 |
| CN101855944A (zh) | 2010-10-06 |
| US8441200B2 (en) | 2013-05-14 |
| WO2009059643A1 (de) | 2009-05-14 |
| JP2011503791A (ja) | 2011-01-27 |
| JP4988931B2 (ja) | 2012-08-01 |
| KR101339031B1 (ko) | 2013-12-09 |
| KR20100098625A (ko) | 2010-09-08 |
| DE502007006751D1 (de) | 2011-04-28 |
| EP2208401B1 (de) | 2011-03-16 |
| ATE502511T1 (de) | 2011-04-15 |
| US20100237791A1 (en) | 2010-09-23 |
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