EP0893943A1 - Inverter for a gas discharge lamp and stepwise variable frequencies - Google Patents
Inverter for a gas discharge lamp and stepwise variable frequencies Download PDFInfo
- Publication number
- EP0893943A1 EP0893943A1 EP97202310A EP97202310A EP0893943A1 EP 0893943 A1 EP0893943 A1 EP 0893943A1 EP 97202310 A EP97202310 A EP 97202310A EP 97202310 A EP97202310 A EP 97202310A EP 0893943 A1 EP0893943 A1 EP 0893943A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- inverter
- bridge circuit
- generated
- frequencies
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
Definitions
- the invention relates to an inverter for feeding a gas discharge lamp, comprising:
- the above mentioned literature reference therefore teaches choosing the power supply frequency of the gas discharge lamp such that at the chosen frequency acoustic resonance is prevented. Once a frequency has been chosen the inverter will continue to operate at the said frequency.
- a selection procedure is run during start-up of the lamp. Use is made herein of a parameter of the lamp to be monitored outside the lamp, such as light output and the like, which is used as indicator for the occurrence of acoustic resonance. If this parameter gives an indication for the occurrence of acoustic resonance a following frequency is chosen. After a time this procedure is completed and the feed of the lamp is retained with the chosen frequency wherein no resonance occurs.
- the circuit known from the first literature reference has the drawback that in the course of time, for instance due to thermal phenomena, the properties of the lamp change so that, at a determined power supply frequency wherein initially no acoustic resonance occurred, acoustic resonance can begin to occur after a period of time. This could result in the above stated drawbacks.
- the object of the present invention is therefore to provide such a circuit wherein the above stated drawbacks are obviated.
- an inverter 1 which is fed by a direct voltage source 2.
- a direct voltage source 2 is formed for instance by a rectifier, for instance a controllable rectifier which rectifies alternating voltage coming from an alternating voltage mains supply. It is otherwise also possible to make use of a direct voltage mains supply.
- the actual inverter 1 comprises four switch elements 3,4,5,6 which are connected in the form of a bridge.
- the switch elements are each formed by bipolar transistors. It will be apparent that it is possible to apply other switch elements such as FETs or other elements designed from semiconductor configurations.
- a freewheel diode 12 is connected in parallel to each of these elements.
- the lamp circuit is connected to the output terminals 7,8.
- the lamp circuit is formed by a ballast 9 and by a gas discharge lamp 10.
- a control circuit 11 is arranged for controlling switch elements 3,4,5,6.
- the control circuit is formed essentially by for instance a microprocessor which is provided with a suitable drive circuit for driving the control electrodes of the switch elements. Use is preferably made of a micro-controller provided with a sequence counter.
- the control herein is such that the frequency of the signal generated at the output terminals 7,8 is independent of the impedance connected thereto.
- the ballast coil 9 does not therefore form an implicit part of the oscillator circuit.
- control circuit 11 can fully determine the frequency of the output signal.
- the frequency is herein determined such that it varies stepwise at discrete time intervals.
- Such a configuration is shown for instance in figure 2.
- the frequency of the oscillator circuit is chosen at F 1 , from point in time t 1 to t 2 at F 4 , from t 2 to t 3 at F 2 and so on.
- the starting point is six separate frequencies which are stored for instance in the memory of control circuit 11.
- a frequency following a first frequency is always chosen which is separated by at least one other frequency.
- the successive frequencies are thus located relatively far away from each other. Achieved herewith is that if acoustic resonance were to occur at a random frequency the following frequency is located so far away therefrom that it is certain no acoustic resonance will occur at the following frequency.
- time durations i.e. the time durations between the points in time t 0 , t 1 , t 2 and so on are always the same.
- the time durations for which a frequency is generated are proportional to the frequency.
- the frequency between two successive points in time is modulated to a very slight extent.
- the danger of acoustic resonance is herein reduced still further.
- the adjustable voltage source is supplied by an alternating voltage source 25 and comprises a mains filter 26, a rectifier 27 and a controllable control element, for instance a FET 12, a smoothing choke 13, a diode 14 and a current measuring resistor 15.
- a control circuit 16 is arranged for control. This can be combined with the control circuit 4 of the foregoing embodiments.
- control circuits are per se known, for instance as the commercially available circuit MSC 60028.
- Control circuit 16 is connected to both sides of the current measuring resistor 15. Control circuit 16 is further connected by means of a controllable feedback network 18 to the output terminals.
- Feedback network 18 comprises a resistance divider comprising two resistors 19,20 and a controllable attenuation network which is connected in parallel to the second resistor 20 and which is formed in the present embodiment by a parallel circuit of four series connections of a resistor 21 and an electronic switch 22.
- resistors 19,20,21 are of course chosen so that the output voltage of the circuit can be varied in the vicinity of the nominal voltage, for instance between 350 V and 450 V.
Abstract
The invention relates to an inverter for feeding a
gas discharge lamp, comprising: a direct voltage source;
at least two switch elements incorporated in a bridge
circuit; a control circuit for controlling the switch
elements so that the bridge circuit continuously generates
an alternating voltage; at least one ballast inductance
connected to one of the output terminals of the
bridge circuit; and at least one gas discharge lamp
connected between the ballast inductance and the other
output terminal of the bridge circuit, wherein the control
circuit is adapted to apply at its output terminals
a control signal to the switch elements of the bridge
circuit so that the alternating voltage generated by the
bridge circuit changes frequency stepwise in time between
at least three frequencies.
According to a preferred embodiment the time duration
for which a signal of a determined frequency is
generated depends on the value of the frequency.
Description
The invention relates to an inverter for feeding a
gas discharge lamp, comprising:
- a direct voltage source;
- at least two switch elements incorporated in a bridge circuit;
- a control circuit for controlling the switch elements so that the bridge circuit continuously generates an alternating voltage;
- at least one ballast inductance connected to one of the output terminals of the bridge circuit; and
- at least one gas discharge lamp connected between the ballast inductance and the other output terminal of the bridge circuit.
Such an inverter is known from US-A-5 569 984.
In high-frequency feed of gas discharge lamps, which
is per se attractive in respect of the attractive dimensioning
of the frequency-dependent components which goes
together with high frequencies, it is generally known
that acoustic resonances can occur in gas discharge
lamps. If they persist for long enough, such acoustic
resonances can result in destruction of the lamp or in
considerable shortening of the lifespan of the lamp.
The above mentioned literature reference therefore
teaches choosing the power supply frequency of the gas
discharge lamp such that at the chosen frequency acoustic
resonance is prevented. Once a frequency has been chosen
the inverter will continue to operate at the said frequency.
In order to choose the correct frequency a selection
procedure is run during start-up of the lamp. Use is made
herein of a parameter of the lamp to be monitored outside
the lamp, such as light output and the like, which is
used as indicator for the occurrence of acoustic resonance.
If this parameter gives an indication for the
occurrence of acoustic resonance a following frequency is
chosen. After a time this procedure is completed and the
feed of the lamp is retained with the chosen frequency
wherein no resonance occurs.
From US-A 5 365 151 is known a similar circuit,
wherein the gas discharge lamp is also fed with different
frequencies and wherein the frequency of the lamp is
changed for instance to vary the light output or the
colour of the light generated by the lamp. This relates
however to two separate frequencies or a frequency which
varies continuously within a frequency range.
The circuit known from the first literature reference
has the drawback that in the course of time, for
instance due to thermal phenomena, the properties of the
lamp change so that, at a determined power supply frequency
wherein initially no acoustic resonance occurred,
acoustic resonance can begin to occur after a period of
time. This could result in the above stated drawbacks.
The object of the present invention is therefore to
provide such a circuit wherein the above stated drawbacks
are obviated.
Finally, the journal article "White-Noise Modulation
of High-Frequency High-Intensity Discharge Lamp Ballasts"
by Laskai et al. describes a circuit wherein the power is
modulated continuously in a random distribution in order
to prevent inter alia acoustic resonance; stepwise varying
of the frequency is not discussed here either.
The present invention will be elucidated hereinbelow
with reference to the annexed drawings, in which:
Shown in figure 1 is an inverter 1 which is fed by a
direct voltage source 2. This latter is formed for instance
by a rectifier, for instance a controllable rectifier
which rectifies alternating voltage coming from an
alternating voltage mains supply. It is otherwise also
possible to make use of a direct voltage mains supply.
The actual inverter 1 comprises four switch elements
3,4,5,6 which are connected in the form of a bridge. In
the present embodiment the switch elements are each
formed by bipolar transistors. It will be apparent that
it is possible to apply other switch elements such as
FETs or other elements designed from semiconductor configurations.
A freewheel diode 12 is connected in parallel
to each of these elements.
The lamp circuit is connected to the output terminals
7,8. The lamp circuit is formed by a ballast 9 and
by a gas discharge lamp 10. A control circuit 11 is
arranged for controlling switch elements 3,4,5,6. The
control circuit is formed essentially by for instance a
microprocessor which is provided with a suitable drive
circuit for driving the control electrodes of the switch
elements. Use is preferably made of a micro-controller
provided with a sequence counter.
The control herein is such that the frequency of the
signal generated at the output terminals 7,8 is independent
of the impedance connected thereto. In this case the
ballast coil 9 does not therefore form an implicit part
of the oscillator circuit.
It is thus apparent that the control circuit 11 can
fully determine the frequency of the output signal.
The frequency is herein determined such that it
varies stepwise at discrete time intervals.
Such a configuration is shown for instance in figure
2. Herein during the first time duration from the point
in time t0 to the point in time t1 the frequency of the
oscillator circuit is chosen at F1, from point in time t1
to t2 at F4, from t2 to t3 at F2 and so on.
In this embodiment the starting point is six separate
frequencies which are stored for instance in the
memory of control circuit 11. Thus is avoided that the
lamp is operated for such a long period at a particular
frequency that acoustic resonance possibly occurring at
said frequency results in destruction phenomena; the
frequency has already been changed again to another
frequency before this is the case.
It is however possible to make a choice from a
larger number of frequencies.
It is equally unnecessary to cause the frequencies
to repeatedly run through a cycle but instead to choose
the frequencies in a random sequence.
In this embodiment a frequency following a first
frequency is always chosen which is separated by at least
one other frequency. The successive frequencies are thus
located relatively far away from each other. Achieved
herewith is that if acoustic resonance were to occur at a
random frequency the following frequency is located so
far away therefrom that it is certain no acoustic resonance
will occur at the following frequency.
In the above stated embodiment the time durations,
i.e. the time durations between the points in time t0, t1,
t2 and so on are always the same.
According to another embodiment which is shown in
figure 3, the time durations for which a frequency is
generated are proportional to the frequency. An attempt
is made here to distribute the power frequency spectrum
as much as possible; the power fed to the lamp is in any
case inversely proportional to the frequency as a result
of the presence of the inductance 9.
According to yet another embodiment the frequency
between two successive points in time is modulated to a
very slight extent. The danger of acoustic resonance is
herein reduced still further.
In the choice of the frequencies and the time durations
a strategy can further be applied which aims at
power regulation of the lamp. At nominal voltage gas
discharge lamps have a power which gradually varies as a
result of ageing processes. By adapting frequency and
time duration this phenomenon can be compensated. The
frequency and time duration regulation can of course also
be used to vary the light output in order to obtain a
dimmer operation.
It is further possible during start-up of the lamp
to chose the collection of frequencies and the associated
time durations such that start-up takes place as optimally
as possible. The properties of a gas discharge lamp
anyway change during start-up as a consequence of the
increase in the temperature and the like.
Finally, it is also possible when a power supply
source with a variable voltage is used, as shown in
figure 2, to vary the voltage originating therefrom,
whereby the power supplied to the lamp can be varied.
This power regulation can be combined with variation of
the collection of frequencies and variation in the length
of the different time durations.
The adjustable voltage source is supplied by an
alternating voltage source 25 and comprises a mains
filter 26, a rectifier 27 and a controllable control
element, for instance a FET 12, a smoothing choke 13, a
diode 14 and a current measuring resistor 15. A control
circuit 16 is arranged for control. This can be combined
with the control circuit 4 of the foregoing embodiments.
Such control circuits are per se known, for instance
as the commercially available circuit MSC 60028.
By controlling each of the four switches 22 the
attenuation and thus the output voltage can therefore be
set to 16 different values, this being controllable by
control circuit 16. This results in an extensive adjustment
option with simple means.
The values of resistors 19,20,21 are of course
chosen so that the output voltage of the circuit can be
varied in the vicinity of the nominal voltage, for instance
between 350 V and 450 V.
Claims (11)
- Inverter for feeding a gas discharge lamp, comprising:a direct voltage source;at least two switch elements incorporated in a bridge circuit;a control circuit for controlling the switch elements so that the bridge circuit continuously generates an alternating voltage;at least one ballast inductance connected to one of the output terminals of the bridge circuit; andat least one gas discharge lamp connected between the ballast inductance and the other output terminal of the bridge circuit,
characterized in that the control circuit is adapted to apply at its output terminals a control signal to the switch elements of the bridge circuit so that the alternating voltage generated by the bridge circuit changes frequency stepwise in time between at least three frequencies. - Inverter as claimed in claim 1, characterized in that the time duration for which a signal of a determined frequency is generated depends on the value of the frequency.
- Inverter as claimed in claim 2, characterized in that the time duration for which a high frequency is generated is longer than the time duration wherein a low frequency is generated.
- Inverter as claimed in any of the foregoing claims, characterized in that the frequency of the generated alternating voltage is modulated to a slight extent within a time duration with substantially constant frequency, wherein the frequency change is smaller than the difference between frequencies generated during different time durations.
- Inverter as claimed in any of the foregoing claims, characterized in that the generated frequencies are chosen from a collection of discrete frequencies and that frequencies following one another in time are separated by at least one intermediate frequency.
- Inverter as claimed in any of the foregoing claims, characterized in that the voltage generated by the direct voltage source is adjustable.
- Inverter as claimed in claim 6, characterized in that the direct voltage source comprises a regulating circuit to which the output voltage of the circuit is fed via a controllable feedback network.
- Inverter as claimed in claim 6 or 7, characterized in that the voltage generated by the voltage source is controlled for adjustment of the power supplied to the lamp.
- Inverter as claimed in any of the foregoing claims, characterized in that the control circuit is remotely controllable.
- Inverter as claimed in any of the foregoing claims, characterized in that the control circuit is adapted to control the frequency and the time duration of the frequency of the bridge circuit in order to adjust herewith the power supplied to the lamp.
- Inverter as claimed in claim 7, 8 or 9, characterized in that the control circuit is adapted to choose the frequencies during the start-up phase of the lamp such that the lamp is started up optimally.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE69735257T DE69735257T2 (en) | 1997-07-24 | 1997-07-24 | Inverter for supplying a discharge lamp with a suddenly variable frequency |
| AT97202310T ATE318068T1 (en) | 1997-07-24 | 1997-07-24 | INVERTER FOR SUPPLYING A DISCHARGE LAMP WITH A SURPRISELY VARIABLE FREQUENCY |
| EP97202310A EP0893943B1 (en) | 1997-07-24 | 1997-07-24 | Inverter for a gas discharge lamp with stepwise variable frequencies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97202310A EP0893943B1 (en) | 1997-07-24 | 1997-07-24 | Inverter for a gas discharge lamp with stepwise variable frequencies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0893943A1 true EP0893943A1 (en) | 1999-01-27 |
| EP0893943B1 EP0893943B1 (en) | 2006-02-15 |
Family
ID=8228587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97202310A Expired - Lifetime EP0893943B1 (en) | 1997-07-24 | 1997-07-24 | Inverter for a gas discharge lamp with stepwise variable frequencies |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0893943B1 (en) |
| AT (1) | ATE318068T1 (en) |
| DE (1) | DE69735257T2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2153314A1 (en) * | 1999-02-17 | 2001-02-16 | Univ Cantabria | Electronic soft start up and optimisation system of energy transfer for discharge lamps |
| WO2002009480A1 (en) * | 2000-07-20 | 2002-01-31 | Koninklijke Philips Electronics N.V. | A system and method for determining the frequency of longitudinal mode required for color mixing in a discharge lamp |
| ES2169662A1 (en) * | 2000-05-08 | 2002-07-01 | Sunshower Espana S L | Simplified wiring based electromagnetic radiation multi charge ballast has multiple converters and a harmonics filter for e.g. UV lamp type charges |
| WO2003009652A1 (en) * | 2001-07-13 | 2003-01-30 | Sunshower España, S.L. | Multiload ballast for electromagnetic radiation with simplified wiring |
| WO2003039206A1 (en) * | 2001-10-31 | 2003-05-08 | Koninklijke Philips Electronics N.V. | Ballasting circuit |
| WO2003049508A1 (en) * | 2001-12-05 | 2003-06-12 | Koninklijke Philips Electronics N.V. | Color mixing in hid lamp at vhf frequencies |
| WO2007068604A1 (en) * | 2005-12-14 | 2007-06-21 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement and method for the operation of a high-pressure gas discharge lamp |
| CN100464616C (en) * | 2004-06-30 | 2009-02-25 | 哈尔滨工业大学 | Digital electronic ballast of high pressure gas discharge lamp and digital control method therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291907A (en) * | 2011-05-19 | 2011-12-21 | 安徽卓越电气有限公司 | Digital electronic ballast of electrodeless lamp and control method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0066927A1 (en) * | 1981-06-04 | 1982-12-15 | Philips Patentverwaltung GmbH | Method and circuit for operating a high pressure metal vapour discharge lamp |
| US4523128A (en) * | 1982-12-10 | 1985-06-11 | Honeywell Inc. | Remote control of dimmable electronic gas discharge lamp ballasts |
| EP0291223A1 (en) * | 1987-05-12 | 1988-11-17 | THORN EMI plc | Power supply |
| EP0397334A1 (en) * | 1989-04-26 | 1990-11-14 | TLG plc | A method of operating an arc discharge lamp |
| US5365151A (en) * | 1991-07-12 | 1994-11-15 | Tridonic Bauelemente Gmbh | Gas discharge lamp ballast circuit with frequency modulated pulse control |
| EP0633711A1 (en) * | 1992-03-25 | 1995-01-11 | Toto Ltd. | Power regulator of discharge lamp and variable color illumination apparatus using the regulator |
| US5394064A (en) * | 1993-10-15 | 1995-02-28 | Micro-Technology Inc.-Wisconsin | Electronic ballast circuit for fluorescent lamps |
| US5481163A (en) * | 1993-08-03 | 1996-01-02 | Mitsubishi Denki Kabushiki Kaisha | Discharge lamp current controlling circuit |
| EP0744883A1 (en) * | 1995-05-23 | 1996-11-27 | PRÄZISA Industrieelektronik GmbH | Device and process for operating a high pressure discharge lamp |
| EP0746186A1 (en) * | 1995-06-02 | 1996-12-04 | Nippondenso Co., Ltd. | Control apparatus for a lighting system of a discharge lamp used in various types of vehicles |
-
1997
- 1997-07-24 AT AT97202310T patent/ATE318068T1/en not_active IP Right Cessation
- 1997-07-24 EP EP97202310A patent/EP0893943B1/en not_active Expired - Lifetime
- 1997-07-24 DE DE69735257T patent/DE69735257T2/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0066927A1 (en) * | 1981-06-04 | 1982-12-15 | Philips Patentverwaltung GmbH | Method and circuit for operating a high pressure metal vapour discharge lamp |
| US4523128A (en) * | 1982-12-10 | 1985-06-11 | Honeywell Inc. | Remote control of dimmable electronic gas discharge lamp ballasts |
| EP0291223A1 (en) * | 1987-05-12 | 1988-11-17 | THORN EMI plc | Power supply |
| EP0397334A1 (en) * | 1989-04-26 | 1990-11-14 | TLG plc | A method of operating an arc discharge lamp |
| US5365151A (en) * | 1991-07-12 | 1994-11-15 | Tridonic Bauelemente Gmbh | Gas discharge lamp ballast circuit with frequency modulated pulse control |
| EP0633711A1 (en) * | 1992-03-25 | 1995-01-11 | Toto Ltd. | Power regulator of discharge lamp and variable color illumination apparatus using the regulator |
| US5481163A (en) * | 1993-08-03 | 1996-01-02 | Mitsubishi Denki Kabushiki Kaisha | Discharge lamp current controlling circuit |
| US5394064A (en) * | 1993-10-15 | 1995-02-28 | Micro-Technology Inc.-Wisconsin | Electronic ballast circuit for fluorescent lamps |
| EP0744883A1 (en) * | 1995-05-23 | 1996-11-27 | PRÄZISA Industrieelektronik GmbH | Device and process for operating a high pressure discharge lamp |
| EP0746186A1 (en) * | 1995-06-02 | 1996-12-04 | Nippondenso Co., Ltd. | Control apparatus for a lighting system of a discharge lamp used in various types of vehicles |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2153314A1 (en) * | 1999-02-17 | 2001-02-16 | Univ Cantabria | Electronic soft start up and optimisation system of energy transfer for discharge lamps |
| ES2169662A1 (en) * | 2000-05-08 | 2002-07-01 | Sunshower Espana S L | Simplified wiring based electromagnetic radiation multi charge ballast has multiple converters and a harmonics filter for e.g. UV lamp type charges |
| WO2002009480A1 (en) * | 2000-07-20 | 2002-01-31 | Koninklijke Philips Electronics N.V. | A system and method for determining the frequency of longitudinal mode required for color mixing in a discharge lamp |
| WO2003009652A1 (en) * | 2001-07-13 | 2003-01-30 | Sunshower España, S.L. | Multiload ballast for electromagnetic radiation with simplified wiring |
| WO2003039206A1 (en) * | 2001-10-31 | 2003-05-08 | Koninklijke Philips Electronics N.V. | Ballasting circuit |
| US6965204B2 (en) | 2001-10-31 | 2005-11-15 | Koninklijke Philips Electronics N.V. | Ballasting circuit for optimizing the current in the take-over/warm-up phase |
| WO2003049508A1 (en) * | 2001-12-05 | 2003-06-12 | Koninklijke Philips Electronics N.V. | Color mixing in hid lamp at vhf frequencies |
| CN100464616C (en) * | 2004-06-30 | 2009-02-25 | 哈尔滨工业大学 | Digital electronic ballast of high pressure gas discharge lamp and digital control method therefor |
| WO2007068604A1 (en) * | 2005-12-14 | 2007-06-21 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement and method for the operation of a high-pressure gas discharge lamp |
| US7898186B2 (en) | 2005-12-14 | 2011-03-01 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement and method for the operation of a high-pressure gas discharge lamp |
| CN101331806B (en) * | 2005-12-14 | 2012-05-30 | 欧司朗股份有限公司 | Circuit arrangement and method for the operation of a high-pressure gas discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69735257D1 (en) | 2006-04-20 |
| EP0893943B1 (en) | 2006-02-15 |
| ATE318068T1 (en) | 2006-03-15 |
| DE69735257T2 (en) | 2006-11-16 |
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