CA1260055A - Dc-ac converter for igniting and supplying a discharge lamp - Google Patents
Dc-ac converter for igniting and supplying a discharge lampInfo
- Publication number
- CA1260055A CA1260055A CA000521744A CA521744A CA1260055A CA 1260055 A CA1260055 A CA 1260055A CA 000521744 A CA000521744 A CA 000521744A CA 521744 A CA521744 A CA 521744A CA 1260055 A CA1260055 A CA 1260055A
- Authority
- CA
- Canada
- Prior art keywords
- converter
- capacitor
- discharge lamp
- control electrode
- 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.)
- Expired
Links
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
- H05B41/2806—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 electrodes in the vessel, e.g. surface discharge lamps, electrodeless discharge lamps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
ABSTRACT:
DC-AC converter for igniting and supplying a discharge lamp.
DC-AC converter for igniting and supplying a low-pressure discharge lamp such as an electrodeless low-pressure gas discharge lamp, which converter is provided with two input terminals (9, 10) intended to be connected to a d.c. voltage source which input terminals are connected together by means of a series arrangement of a semiconduc-tor switching element (12) provided with a control electrode, a first coil (14) and a parallel circuit with the discharge lamp 15 and incorporated in one of its branches, the control electrode and a main electrode of the controlled semiconductor switching element (12) being connected together by means of a secondary winding (21) of a transformer (17) whose primary winding (16) forms part of the parallel circuit. According to the invention the converter incorporates a starter circuit comprising a resistor (28) connected between a main electrode and the control electrode of the semiconductor switching element (12) and a capacitor (29) arranged between the control electrode and one end of the secondary winding (21) of the transformer (17).
DC-AC converter for igniting and supplying a discharge lamp.
DC-AC converter for igniting and supplying a low-pressure discharge lamp such as an electrodeless low-pressure gas discharge lamp, which converter is provided with two input terminals (9, 10) intended to be connected to a d.c. voltage source which input terminals are connected together by means of a series arrangement of a semiconduc-tor switching element (12) provided with a control electrode, a first coil (14) and a parallel circuit with the discharge lamp 15 and incorporated in one of its branches, the control electrode and a main electrode of the controlled semiconductor switching element (12) being connected together by means of a secondary winding (21) of a transformer (17) whose primary winding (16) forms part of the parallel circuit. According to the invention the converter incorporates a starter circuit comprising a resistor (28) connected between a main electrode and the control electrode of the semiconductor switching element (12) and a capacitor (29) arranged between the control electrode and one end of the secondary winding (21) of the transformer (17).
Description
~2~ 5~
P~IN l1.542 l 1.6,1986 DC-AC converter for igniting and supplying a discharge lamp.
The invention relates to a DC AC converter for igniting and supplying a low-pressure discharge lamp, which converter is provided with two input terminals intended to be connected to a d.c. voltage source, the input terminals being connected together by means of a series arrangement of a semiconductor switching element having a control electrode, a first coil and a parallel circuit with the discharge lamp being incorporated in one of its branches, the control electrode and a main electrode of the control-led semiconductor switching element being connectedtogether by means of a secondary winding of a transformer whose primary winding forms part of the parallel circuit, a starter circuit being incorporated in the converter.
A DC AC converter of this type is known from the published NL-~tent Application 8004175.
With this converter, for example, an electrodeless low-pressure discharge lamp having an operating frequency of at least 0.5 M~lz or a compact low-pressure mercury discharge lamp is supplied. It has been found that the converter has a high efficiency.
In order to start the converter a starter circuit is incorporated in the control circuit of a semiconductor switching element consisting inter alia of a series arrangement of a resistor and a capacitor connecting the input terminals of the converter together. Furthermore the starter circuit has a branch comprising a bidirectional breakdown element (diac) which is connected at one end to a junction between the said resistor and capacitor and at the other end to the control electrode of the semiconduc tor switch, It has been found that the use of the capacitor and the said breakdown element in the starter circuit ~6~
PHN 11.54 2 2 I . 6 . 1 9 8 6 often gives rise to an increasecl radio interference level.
In fact, the said capacitor is charged over ancl over again via the resistor up -to the breakdown level of the diac whereafter a start pulse in -the operating converter is supplied. Furthermore it has been found that the breakdown current of the diac at higher temperatures increases in the course of the operating time. For reliable star-ting a circuit is to be designed for a fairly high breakdown current which also f':Lows through the said resistor. In that case extra thermal losses occur. This is a drawback, particularly if the converter and the lamp are integrated to form a compact unit.
It is an object of the invention to provide a DC-AC converter having such a starter circuit that inter-ference signals are reduced as much as possible and whichobviates the use of a breakdown element.
To this end a DC-AC converter of the type described in the opening paragraph according to the invention is characterized in that the starter circuit includes a 20 resistor which i5 connected between the main electrode and the control electrode of the semi-conductor switching element, and a capacitor which is arranged between the control electrode and one end of the secondary winding of the transformer.
The starter circuit of the converbr according to the invention obviates the use of a bidirection~l break-down element. During operation of the conver$er no inter-ference signals are generated on the supply mains. The energy dissipation in the starter circuit is also greatly 30 reduced during operation. The number of components required is further reduced as compared with the known circuit. Because of these properties the entire circuit of the converter can easily be integrated in a ?amp base of a compact lamp such as in the base of a fluorescent electro~
35 deless low-pressure mercury discharge lamp.
The invention is based on the recognition that upon switching on the converter the capaci-tor arranged OOS~
PHN 1l.542 3 1~6.1986 between the control electrode and a rnain electrode of the switching element is first charged until the voltage on the control electrode is sufficiently high to render the switching element conducting. As a result a much higher current suddenly flows through the resonant circuit which is incorporated in the series arrangement. This resonant circuit is the parallel arrangement of -the primary transformer winding and a capacitor on the one hand and th~e first coil. This parallel arrangement also incorpo-rates the winding of an electrodeless discharge lamp. Theresonant circuit starts oscillating because of the flow of the suddenly much higher current. The primary winding incorporated in this circuit then takes over the drive of the semiconductor switching element. Any further starting pulses are then no longer applied to the switching element.
The capacitance of the capacitor in the starter circui-t is chosen to be such that its impedance at the operating frequency of the converter is low. Preferably a value at which the thermal losses during operation are 20 negligible is chosen for the starting resistor.
The said semiconductor switching element is pre-ferably a MOS-FET.
The invention will be further described by way of example with reference to the accompanying drawing.
The drawing shows an embodiment of a DC-AC conver-ter according to the invention with an electrodeless low-pressure mercury vapour discharge lamp connected thereto~
The input terminals intended to be connected to an a.c. voltage source (220 V, 50 Hz) are denoted by 1 3D and 2. These terminals are connected via a current-limiting resistor 3 and a fuse 4 to a full-wave rectifier 5. The output voltage of this rectifier is smoothed by means of the capacitor 6. Together with -the highfrequency capacitor 7 and coil 8 capacitor 6 constitutes a mains interference suppression filter. The outp-ut terminals ~ and 10 of the rectifier are also -the input terminals for the DC-AC
converter, capacitor 11 of which constitut0s the RF-d.c.
voltage source.
~IL26(~ j5 PHN 11.5L12 4 1.6.1986 The input terminals 9 and 10 are connected toge-ther by means of a f:irst series arrangement of a semi-conductor switching element (power MOS_FET) 12, a capacitor 13, a coil 14 and a parallel arrangement of a coil 15 at one end and a series connection of a primary winding 16 of a current transformer 17 and a capacitor 18 a-t the other end. Coil 15 is coupled to the discharge path in an electrodeless discharge lamp, diagrammatically denoted by 19. Furthermore the circuit incorporates a second semiconductor switching element (power MOS-FET) 20, which is arranged in series with 12 and is connected to terminal 10. The primary winding 16 is bridged by a resistor 30 for ~timizing the phase of the feedback signal.
The transformer 17 has two secondary windings 21 and 22. Winding 21 forms part of the control circuit of the switching element 12 and connects the control electrode of 12 to a main electrode thereof. The ends of winding 21 are connected by a voltage-limiting circuit consisting of` a series arrangement of two oppositely arranged Zener diodes 23 and 24. Winding 22 forms part of the control circuit of switch 20 and is bridged via capacitor 25 by the series arrangement of the oppositely arranged Zener diodes 26 and 27.
The starter circuit f`or the converter forms part of the control circuit of the P01~ER-MOS-semiconductor swit-ching element 12. The sta~er circuit includes a resistor 28 which is connected between a main electrode and the control electrode of the element 12, as well as a capacitor 29 which is arranged between the said control electrode and the end of the secondary winding 21.
The circuit described operates as follows. If the terminals 1 and 2 are connected to an a.c. voltage source, the capacitors 6, 7 and 11 are quickly charged via the rectifier 5 up to the peak value of` the a.c. voltage originating from the a.c. voltage source. The d.c. voltage is present across the series arrangement 28, 29, 21, 13, 1L~
and l5. The capacitors 29 and 13 are charged vla resistor PHN11~542 5 1.6.1986 28 until the voltage across capacitor 29 reaches a threshold at which the semiconductor switching element 12 becomes conducting. Then a rnuch higher current flows through the elements 12, 13 and 14 as well as in the parallel circuit 15, 16 and 18. An oscillation is then produced in this circuit whereafter the transformer 17 renders the semiconductor element 12 non-conducting and renders 20 conducting. This produces a current through capacitor 11 whereafter 20 becornes non-conducting again and 12 becomes lD conducting again and so forth~
In a practical embodiment the above-mentioned circuit elements approximately have the ~Lues as shown in the Table below:
TABLE
15 1 . ... _.. _.
capacitor 615/uF
capacitor 710 nF
capacitor 11'00 nF
capacitor 18560 pF
capacitor 2510 nF
capacitor 2910 nF
.....
coil 8 100 /uH
coil 14 27 /uH
coil 15 8 /uH
resistor 28 20 MOhm resis-tor 30 2,7 Ohm resistor 3 4~7 Ohm 30 Zener voltages of each of the Zener diodes 23, 24, 26, 27 6.8 Volts trans:E`ormer -primary winding 16 1 turn -secondary winding 21 10 turns -secondary winding 22 10 turn5 _. .
~2 Eii0~55 - 6 - 2010~-8152 The electrodeless lamp (19) which is coupled to a circuit including the elements shown in the table above has a power of 18 W. The coil 15 is formed as a winding around a ferro-magnetic core which is arranged centrally in a spherical discharge vessel.
The RC time constant of the series resistor (3~ of the rec-tifier 5 and the smoothing capacitor 6 is shorter than the RC
time constant of the starter circuit 2~ and 29. The starter circuit does not operate until a-fter the d.c. voltage source has reached the peak value of the mains voltage. Generally favourable results were achieved with the above~mentioned circuit if the first-mentioned RC time constant was a factor of 500 to 1500 shorter than the second. At the values shown in the Table the first RC time constant was approximately a factor of 1300 shorter.
In an alternative embodiment the parallel circuit in-corporates a low-pressure mercury vapour discharge lamp having a hook-shaped bent discharge tube instead of the electrodeless lamp 19. Coil 15 is then replaced by a series arrangement of the -two electrodes present on the ends of the tube whilst a resistor hav-ing a positive temperature coefficient is arranged between the juxtaposed supply wires of the two electrodes.
P~IN l1.542 l 1.6,1986 DC-AC converter for igniting and supplying a discharge lamp.
The invention relates to a DC AC converter for igniting and supplying a low-pressure discharge lamp, which converter is provided with two input terminals intended to be connected to a d.c. voltage source, the input terminals being connected together by means of a series arrangement of a semiconductor switching element having a control electrode, a first coil and a parallel circuit with the discharge lamp being incorporated in one of its branches, the control electrode and a main electrode of the control-led semiconductor switching element being connectedtogether by means of a secondary winding of a transformer whose primary winding forms part of the parallel circuit, a starter circuit being incorporated in the converter.
A DC AC converter of this type is known from the published NL-~tent Application 8004175.
With this converter, for example, an electrodeless low-pressure discharge lamp having an operating frequency of at least 0.5 M~lz or a compact low-pressure mercury discharge lamp is supplied. It has been found that the converter has a high efficiency.
In order to start the converter a starter circuit is incorporated in the control circuit of a semiconductor switching element consisting inter alia of a series arrangement of a resistor and a capacitor connecting the input terminals of the converter together. Furthermore the starter circuit has a branch comprising a bidirectional breakdown element (diac) which is connected at one end to a junction between the said resistor and capacitor and at the other end to the control electrode of the semiconduc tor switch, It has been found that the use of the capacitor and the said breakdown element in the starter circuit ~6~
PHN 11.54 2 2 I . 6 . 1 9 8 6 often gives rise to an increasecl radio interference level.
In fact, the said capacitor is charged over ancl over again via the resistor up -to the breakdown level of the diac whereafter a start pulse in -the operating converter is supplied. Furthermore it has been found that the breakdown current of the diac at higher temperatures increases in the course of the operating time. For reliable star-ting a circuit is to be designed for a fairly high breakdown current which also f':Lows through the said resistor. In that case extra thermal losses occur. This is a drawback, particularly if the converter and the lamp are integrated to form a compact unit.
It is an object of the invention to provide a DC-AC converter having such a starter circuit that inter-ference signals are reduced as much as possible and whichobviates the use of a breakdown element.
To this end a DC-AC converter of the type described in the opening paragraph according to the invention is characterized in that the starter circuit includes a 20 resistor which i5 connected between the main electrode and the control electrode of the semi-conductor switching element, and a capacitor which is arranged between the control electrode and one end of the secondary winding of the transformer.
The starter circuit of the converbr according to the invention obviates the use of a bidirection~l break-down element. During operation of the conver$er no inter-ference signals are generated on the supply mains. The energy dissipation in the starter circuit is also greatly 30 reduced during operation. The number of components required is further reduced as compared with the known circuit. Because of these properties the entire circuit of the converter can easily be integrated in a ?amp base of a compact lamp such as in the base of a fluorescent electro~
35 deless low-pressure mercury discharge lamp.
The invention is based on the recognition that upon switching on the converter the capaci-tor arranged OOS~
PHN 1l.542 3 1~6.1986 between the control electrode and a rnain electrode of the switching element is first charged until the voltage on the control electrode is sufficiently high to render the switching element conducting. As a result a much higher current suddenly flows through the resonant circuit which is incorporated in the series arrangement. This resonant circuit is the parallel arrangement of -the primary transformer winding and a capacitor on the one hand and th~e first coil. This parallel arrangement also incorpo-rates the winding of an electrodeless discharge lamp. Theresonant circuit starts oscillating because of the flow of the suddenly much higher current. The primary winding incorporated in this circuit then takes over the drive of the semiconductor switching element. Any further starting pulses are then no longer applied to the switching element.
The capacitance of the capacitor in the starter circui-t is chosen to be such that its impedance at the operating frequency of the converter is low. Preferably a value at which the thermal losses during operation are 20 negligible is chosen for the starting resistor.
The said semiconductor switching element is pre-ferably a MOS-FET.
The invention will be further described by way of example with reference to the accompanying drawing.
The drawing shows an embodiment of a DC-AC conver-ter according to the invention with an electrodeless low-pressure mercury vapour discharge lamp connected thereto~
The input terminals intended to be connected to an a.c. voltage source (220 V, 50 Hz) are denoted by 1 3D and 2. These terminals are connected via a current-limiting resistor 3 and a fuse 4 to a full-wave rectifier 5. The output voltage of this rectifier is smoothed by means of the capacitor 6. Together with -the highfrequency capacitor 7 and coil 8 capacitor 6 constitutes a mains interference suppression filter. The outp-ut terminals ~ and 10 of the rectifier are also -the input terminals for the DC-AC
converter, capacitor 11 of which constitut0s the RF-d.c.
voltage source.
~IL26(~ j5 PHN 11.5L12 4 1.6.1986 The input terminals 9 and 10 are connected toge-ther by means of a f:irst series arrangement of a semi-conductor switching element (power MOS_FET) 12, a capacitor 13, a coil 14 and a parallel arrangement of a coil 15 at one end and a series connection of a primary winding 16 of a current transformer 17 and a capacitor 18 a-t the other end. Coil 15 is coupled to the discharge path in an electrodeless discharge lamp, diagrammatically denoted by 19. Furthermore the circuit incorporates a second semiconductor switching element (power MOS-FET) 20, which is arranged in series with 12 and is connected to terminal 10. The primary winding 16 is bridged by a resistor 30 for ~timizing the phase of the feedback signal.
The transformer 17 has two secondary windings 21 and 22. Winding 21 forms part of the control circuit of the switching element 12 and connects the control electrode of 12 to a main electrode thereof. The ends of winding 21 are connected by a voltage-limiting circuit consisting of` a series arrangement of two oppositely arranged Zener diodes 23 and 24. Winding 22 forms part of the control circuit of switch 20 and is bridged via capacitor 25 by the series arrangement of the oppositely arranged Zener diodes 26 and 27.
The starter circuit f`or the converter forms part of the control circuit of the P01~ER-MOS-semiconductor swit-ching element 12. The sta~er circuit includes a resistor 28 which is connected between a main electrode and the control electrode of the element 12, as well as a capacitor 29 which is arranged between the said control electrode and the end of the secondary winding 21.
The circuit described operates as follows. If the terminals 1 and 2 are connected to an a.c. voltage source, the capacitors 6, 7 and 11 are quickly charged via the rectifier 5 up to the peak value of` the a.c. voltage originating from the a.c. voltage source. The d.c. voltage is present across the series arrangement 28, 29, 21, 13, 1L~
and l5. The capacitors 29 and 13 are charged vla resistor PHN11~542 5 1.6.1986 28 until the voltage across capacitor 29 reaches a threshold at which the semiconductor switching element 12 becomes conducting. Then a rnuch higher current flows through the elements 12, 13 and 14 as well as in the parallel circuit 15, 16 and 18. An oscillation is then produced in this circuit whereafter the transformer 17 renders the semiconductor element 12 non-conducting and renders 20 conducting. This produces a current through capacitor 11 whereafter 20 becornes non-conducting again and 12 becomes lD conducting again and so forth~
In a practical embodiment the above-mentioned circuit elements approximately have the ~Lues as shown in the Table below:
TABLE
15 1 . ... _.. _.
capacitor 615/uF
capacitor 710 nF
capacitor 11'00 nF
capacitor 18560 pF
capacitor 2510 nF
capacitor 2910 nF
.....
coil 8 100 /uH
coil 14 27 /uH
coil 15 8 /uH
resistor 28 20 MOhm resis-tor 30 2,7 Ohm resistor 3 4~7 Ohm 30 Zener voltages of each of the Zener diodes 23, 24, 26, 27 6.8 Volts trans:E`ormer -primary winding 16 1 turn -secondary winding 21 10 turns -secondary winding 22 10 turn5 _. .
~2 Eii0~55 - 6 - 2010~-8152 The electrodeless lamp (19) which is coupled to a circuit including the elements shown in the table above has a power of 18 W. The coil 15 is formed as a winding around a ferro-magnetic core which is arranged centrally in a spherical discharge vessel.
The RC time constant of the series resistor (3~ of the rec-tifier 5 and the smoothing capacitor 6 is shorter than the RC
time constant of the starter circuit 2~ and 29. The starter circuit does not operate until a-fter the d.c. voltage source has reached the peak value of the mains voltage. Generally favourable results were achieved with the above~mentioned circuit if the first-mentioned RC time constant was a factor of 500 to 1500 shorter than the second. At the values shown in the Table the first RC time constant was approximately a factor of 1300 shorter.
In an alternative embodiment the parallel circuit in-corporates a low-pressure mercury vapour discharge lamp having a hook-shaped bent discharge tube instead of the electrodeless lamp 19. Coil 15 is then replaced by a series arrangement of the -two electrodes present on the ends of the tube whilst a resistor hav-ing a positive temperature coefficient is arranged between the juxtaposed supply wires of the two electrodes.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A DC-AC converter for igniting and supplying a low-pressure discharge lamp, which converter is provided with two input terminals intended to be connected to a d.c. voltage source, said input terminals being connected together by means of a series arrangement of a semiconductor switching element having a control electrode, a first coil and a parallel circuit with the discharge lamp being incorporated in one of its branches, the control elec-trode and a main electrode of the controlled semiconductor switch-ing element being connected together by means of a secondary wind-ing of a transformer whose primary winding forms part of the parallel circuit, a starter circuit being incorporated in the converter, characterized in that the starter circuit includes a resistor which is connected between the other main electrode and the control electrode of the semiconductor switching element, and a capacitor which is arranged between the control electrode and one end of the secondary winding of the transformer.
2. A DC-AC converter as claimed in Claim 1, in which the input terminals are connected to a rectifier including a smoothing capacitor, characterized in that the RC time constant formed in the series arrangement of said capacitor and a resistor of the rectifier is shorter than the RC time constant of the resistor and the capacitor of the starter circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8503008A NL8503008A (en) | 1985-11-04 | 1985-11-04 | DC AC CONVERTER FOR IGNITION AND POWER OF A DISCHARGE LAMP. |
| NL8503008 | 1985-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260055A true CA1260055A (en) | 1989-09-26 |
Family
ID=19846799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000521744A Expired CA1260055A (en) | 1985-11-04 | 1986-10-29 | Dc-ac converter for igniting and supplying a discharge lamp |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4748383A (en) |
| EP (1) | EP0222441B1 (en) |
| JP (1) | JP2613874B2 (en) |
| CA (1) | CA1260055A (en) |
| DE (1) | DE3679634D1 (en) |
| NL (1) | NL8503008A (en) |
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| DE69225834T2 (en) * | 1991-04-04 | 1998-12-24 | Philips Electronics Nv | Circuit arrangement |
| US5200672A (en) * | 1991-11-14 | 1993-04-06 | Gte Products Corporation | Circuit containing symetrically-driven coil for energizing electrodeless lamp |
| GB2264596B (en) * | 1992-02-18 | 1995-06-14 | Standards Inst Singapore | A DC-AC converter for igniting and supplying a gas discharge lamp |
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| US5446350A (en) * | 1994-04-18 | 1995-08-29 | General Electric Company | Impedance matching circuit for an electrodeless fluorescent lamp ballast |
| JPH09505269A (en) * | 1994-09-14 | 1997-05-27 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Sintered molded product made of Li (Ni) Zn ferrite material, transformer core and inductor core, and applications thereof |
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| SG68587A1 (en) * | 1996-07-27 | 1999-11-16 | Singapore Productivity And Sta | An electronic ballast circuit |
| EP0855132B1 (en) * | 1996-08-14 | 2002-06-19 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
| WO1998051133A2 (en) * | 1997-05-07 | 1998-11-12 | Koninklijke Philips Electronics N.V. | Circuit arrangement for operating a discharge lamp |
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| US4463286A (en) * | 1981-02-04 | 1984-07-31 | North American Philips Lighting Corporation | Lightweight electronic ballast for fluorescent lamps |
| DE3142613A1 (en) * | 1981-10-28 | 1983-05-05 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement for starting and operating a low-pressure mercury-vapour discharge lamp |
| IT1161493B (en) * | 1983-07-11 | 1987-03-18 | Olivetti & Co Spa | DIRECT CURRENT CONVERTER FOR STABILIZED SWITCHING POWER SUPPLIES |
| JPS60180479A (en) * | 1984-02-24 | 1985-09-14 | Hitachi Ltd | Self-excited oscillator |
| NL8400923A (en) * | 1984-03-23 | 1985-10-16 | Philips Nv | ELECTRICAL DEVICE FOR IGNITION AND POWERING A GAS AND / OR VAPOR DISCHARGE TUBE. |
-
1985
- 1985-11-04 NL NL8503008A patent/NL8503008A/en not_active Application Discontinuation
-
1986
- 1986-10-27 US US06/923,259 patent/US4748383A/en not_active Expired - Fee Related
- 1986-10-29 CA CA000521744A patent/CA1260055A/en not_active Expired
- 1986-10-31 EP EP86201896A patent/EP0222441B1/en not_active Expired - Lifetime
- 1986-10-31 DE DE8686201896T patent/DE3679634D1/en not_active Expired - Lifetime
- 1986-11-04 JP JP61260830A patent/JP2613874B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0222441B1 (en) | 1991-06-05 |
| JPS62107684A (en) | 1987-05-19 |
| DE3679634D1 (en) | 1991-07-11 |
| EP0222441A1 (en) | 1987-05-20 |
| NL8503008A (en) | 1987-06-01 |
| US4748383A (en) | 1988-05-31 |
| JP2613874B2 (en) | 1997-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |