WO1992004808A1 - Improvements in electronic ballasts - Google Patents
Improvements in electronic ballasts Download PDFInfo
- Publication number
- WO1992004808A1 WO1992004808A1 PCT/AU1991/000402 AU9100402W WO9204808A1 WO 1992004808 A1 WO1992004808 A1 WO 1992004808A1 AU 9100402 W AU9100402 W AU 9100402W WO 9204808 A1 WO9204808 A1 WO 9204808A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluorescent lamp
- circuit
- ballast circuit
- smoothing capacitor
- supply voltage
- Prior art date
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
-
- 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
Definitions
- This invention relates to electrical apparatus and more particularly although not exclusively to compact ballast circuits for fluorescent lamps of the type used as replacements for incandescent bulbs.
- SUBSTITUTE SHEET that the lamp draws current from the rectifier bridge over substantially the whole of the supply voltage waveform including periods when this voltage is less than that across smoothing capacitor C4.
- Figure 3 shows a schematic diagram of a circuit according to this concept
- Figure 4 shows the current waveform produced by the circuit of figure 3.
- ballast circuit which at least in terms of power factor and size has substantial advantages over that of figure 1 and is suitable for use with compact fluorescent lamps of 9 to 18 watts such as those sold under serial numbers YDN13-2H, YDN13- 2U, PLC13/82, DULUX D13W and LYNX D13W.
- Typical non limi t ing values for the various components shown may be as follows:
- a diode D2 (preferably of a high speed switching type such as FR104) is inserted into the circuit just after the full wave rectifier bridge DI and before the smoothing capacitors C5 and C6. Further, the single smoothing capacitor in figure 1 has been replaced by two capacitors C5 and C6 to reduce the physical size of the unit. The lamp drive capacitor C4 however remains directly connected to the rectifier bridge output.
- this diode is to ensure that the current used by the fluorescent lamp is not entirely supplied by capacitors C5 and C6 during portions of the half cycle when the supply voltage 3 is lower than the DC Voltage on C5-, C6.
- D2 blocks the supply from C5, C6 and allows the lamp to draw current directly from the rectifier bridge.
- the current waveform 4 becomes more even as shown in figure 4.
- this curve is still not sinusoidal, it does improve the power factor to better than 0.9, and reduce the current harmonic distortion to within the limits set for even large electronic ballasts (as set out for example in IEC555/2 and AS3168).
- mylar capacitor C3 has to be modified to match the diode. With this particular embodiment when designed for use with a 13 watt fluorescent lamp it may be 0.047 Y 400 volts.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
A ballast circuit for a compact fluorescent lamp in which the power factor is increased by the insertion of a high speed switching diode (D2) after the bridge rectifier (D1) but before the smoothing capacitors (C5, C6). The switching diode operates to prevent the current used by the fluorescent lamp being entirely supplied by the smoothing capacitor(s) during those portions of the half cycle when the supply voltage is lower than the DC voltage on the smoothing capacitor(s).
Description
IMPROVEMENTS IN ELECTRONIC BALLASTS
This invention relates to electrical apparatus and more particularly although not exclusively to compact ballast circuits for fluorescent lamps of the type used as replacements for incandescent bulbs.
Because of their small size and cost constraints it is not feasible (as with larger fluorescent lamp circuits) to install a low-pass filter at the input of these circuits. As a result the compact ballast circuits presently available have a very high current harmonic distortion and a very low power factor of between 0.45 and 0.6. A typical circuit together with voltage 1 and current 2 wave¬ forms for such existing ballasts is shown in figures 1 and 2. Because of these unfavourable characteristics power authorities in many countries such as Australia will not approve these circuits for sale as separate items. Consequently the regulations can only be complied with if the ballast circuit and fluorescent lamp are sold as a complete one piece unit. This however greatly adds to their cost and reduces consumer acceptance of the product.
It is therefore an object of this invention to ameliorate the aforementioned disadvantages and accordingly an improved circuit is disclosed in which additional diode means is provided to ensure
SUBSTITUTE SHEET
that the lamp draws current from the rectifier bridge over substantially the whole of the supply voltage waveform including periods when this voltage is less than that across smoothing capacitor C4.
One preferred form of this invention will now be described with reference to the attached illustrations in which:
Figure 3 shows a schematic diagram of a circuit according to this concept, and
Figure 4 shows the current waveform produced by the circuit of figure 3.
Referring first to figure 3 there is shown a ballast circuit which at least in terms of power factor and size has substantial advantages over that of figure 1 and is suitable for use with compact fluorescent lamps of 9 to 18 watts such as those sold under serial numbers YDN13-2H, YDN13- 2U, PLC13/82, DULUX D13W and LYNX D13W. Typical non limiting values for the various components shown may be as follows:
DI = Bridge Rectifier LI = Filter Coil
DI, D3, D5 & D6 = Diodes L3 = Choke Coil
D4 = Diac L5, L2 & L4 = Core Coil
In this case it will be noted that a diode D2 (preferably of a high speed switching type such as FR104) is inserted into the circuit just after the full wave rectifier bridge DI and before the smoothing capacitors C5 and C6. Further, the single smoothing capacitor in figure 1 has been replaced by two capacitors C5 and C6 to reduce the physical size of the unit. The lamp drive capacitor C4 however remains directly connected to the rectifier bridge output.
The purpose of this diode is to ensure that the current used by the fluorescent lamp is not entirely supplied by capacitors C5 and C6 during portions of the half cycle when the supply voltage 3 is lower than the DC Voltage on C5-, C6. During this period D2 blocks the supply from C5, C6 and allows the lamp to draw current directly from the rectifier bridge. Hence, the current waveform 4 becomes more even as shown in figure 4. Although this curve is still not sinusoidal, it does improve the power factor to better than 0.9, and reduce the current harmonic distortion to within the limits set for even large electronic ballasts (as set out for example in IEC555/2 and AS3168).
The value of mylar capacitor C3 has to be modified to match the diode. With this particular embodiment when designed for use with a 13 watt fluorescent lamp it may be 0.047 Y 400 volts.
It will thus be appreciated that this invention at least in the form of the example disclosed provides a novel and useful improvement m ballasr circuits for compact fluorescent lamps. Clearly nowever embodiment described is only the currently preferred form of this -invention and a wide variety of modifications may be made which would be apparent to a person skilled in the art. For example the
values of the various components may be changed to adapt the circuit for use with larger fluorescent lamps up to 125 watts and for other types of discharge lamps.
Claims
1. A ballast circuit for a fluorescent lamp or the like, said circuit comprising additional diode means whereby said lamp draws current over substantially the whole of the supply voltage waveform and including periods when said supply voltage is less then that across the smoothing capacitor.
2. The ballast circuit as claimed in claim 1 wherein said diode means is located between the rectifier bridge and said smoothing capacitor.
3. The ballast circuit as claimed in claim 2 wherein said diode means is a high speed switching type.
4. A ballast circuit as claimed in claim 3 wherein the power factor thereof is greater than 0.9.
5. A ballast circuit for a fluorescent lamp or the like, said circuit being substantially as described herein with reference to figures 3 and 4.
6. A ballast circuit as claimed in any one of claims 1 to 5 in combination with a fluorescent lamp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9209421A GB2256099B (en) | 1990-08-31 | 1992-04-30 | Improvements in electronic ballasts |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPK2084 | 1990-08-31 | ||
AUPK208490 | 1990-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992004808A1 true WO1992004808A1 (en) | 1992-03-19 |
Family
ID=3774930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1991/000402 WO1992004808A1 (en) | 1990-08-31 | 1991-08-29 | Improvements in electronic ballasts |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2256099B (en) |
WO (1) | WO1992004808A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0599405A1 (en) * | 1992-11-26 | 1994-06-01 | Koninklijke Philips Electronics N.V. | Low harmonic power supply for a discharge lamp |
EP0606665A1 (en) * | 1993-01-12 | 1994-07-20 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
EP0606664A1 (en) * | 1993-01-12 | 1994-07-20 | Koninklijke Philips Electronics N.V. | Ballast circuit |
EP0621743A1 (en) * | 1993-04-23 | 1994-10-26 | Koninklijke Philips Electronics N.V. | Power factor correcting circuit |
US5404082A (en) * | 1993-04-23 | 1995-04-04 | North American Philips Corporation | High frequency inverter with power-line-controlled frequency modulation |
US5410221A (en) * | 1993-04-23 | 1995-04-25 | Philips Electronics North America Corporation | Lamp ballast with frequency modulated lamp frequency |
EP0679046A1 (en) * | 1994-03-25 | 1995-10-25 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit for operating low-pressure discharge lamps |
WO1996008124A1 (en) * | 1994-09-02 | 1996-03-14 | Valmont Industries, Inc. | Circuit for driving a gas discharge lamp load |
CN1050493C (en) * | 1993-01-16 | 2000-03-15 | 浙江照明电器总公司 | High power factor electronic lamp with protector for abnormal condition |
EP2104402A1 (en) * | 2008-03-17 | 2009-09-23 | Chuan Shih Industrial Co., Ldt. | Electronic ballast for fluorescent lamps |
WO2018137240A1 (en) | 2017-01-26 | 2018-08-02 | Redisem Ltd. | Power converter circuit |
US10103631B2 (en) | 2014-03-24 | 2018-10-16 | Redisem Ltd. | Power converter circuit and method thereof |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2390068A1 (en) * | 1977-05-04 | 1978-12-01 | Gte Sylvania Inc | |
AU1522383A (en) * | 1982-06-01 | 1983-12-08 | Merlin Gerin S.A. (Proprietary) Limited | Reduction of harmonics in gas discharge lamp ballasts |
DE3308407A1 (en) * | 1982-09-14 | 1984-03-22 | Matsushita Electric Works Ltd | POWER ADAPTER |
AU2708684A (en) * | 1983-05-05 | 1984-11-08 | Dubank Electronics Pty. Ltd. | Electronic ballast and starter |
EP0205287A2 (en) * | 1985-06-04 | 1986-12-17 | Thorn Emi Lighting (Nz) Limited | Improvements in or relating to switched mode power supplies |
JPH01252175A (en) * | 1988-03-31 | 1989-10-06 | Toshiba Lighting & Technol Corp | Inverter device |
AU5076790A (en) * | 1989-03-07 | 1990-09-20 | Thorn Emi Plc | Switched-mode regulator circuit |
WO1991002400A1 (en) * | 1989-08-04 | 1991-02-21 | Courier De Mere Henri Edouard | Feeding device for converters, free of harmonic distortion |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3841227A1 (en) * | 1988-12-07 | 1990-06-13 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-PRESSURE DISCHARGE LAMP |
DE58907116D1 (en) * | 1989-05-02 | 1994-04-07 | Siemens Ag | Electronic ballast. |
-
1991
- 1991-08-29 WO PCT/AU1991/000402 patent/WO1992004808A1/en unknown
-
1992
- 1992-04-30 GB GB9209421A patent/GB2256099B/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2390068A1 (en) * | 1977-05-04 | 1978-12-01 | Gte Sylvania Inc | |
AU1522383A (en) * | 1982-06-01 | 1983-12-08 | Merlin Gerin S.A. (Proprietary) Limited | Reduction of harmonics in gas discharge lamp ballasts |
DE3308407A1 (en) * | 1982-09-14 | 1984-03-22 | Matsushita Electric Works Ltd | POWER ADAPTER |
AU2708684A (en) * | 1983-05-05 | 1984-11-08 | Dubank Electronics Pty. Ltd. | Electronic ballast and starter |
EP0205287A2 (en) * | 1985-06-04 | 1986-12-17 | Thorn Emi Lighting (Nz) Limited | Improvements in or relating to switched mode power supplies |
JPH01252175A (en) * | 1988-03-31 | 1989-10-06 | Toshiba Lighting & Technol Corp | Inverter device |
AU5076790A (en) * | 1989-03-07 | 1990-09-20 | Thorn Emi Plc | Switched-mode regulator circuit |
WO1991002400A1 (en) * | 1989-08-04 | 1991-02-21 | Courier De Mere Henri Edouard | Feeding device for converters, free of harmonic distortion |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, E-869, page 59; & JP,A,01 252 175, (TOSHIBA ELECTRIC EQUIPMENT CORP) 6 October 1989. * |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0599405A1 (en) * | 1992-11-26 | 1994-06-01 | Koninklijke Philips Electronics N.V. | Low harmonic power supply for a discharge lamp |
EP0606665A1 (en) * | 1993-01-12 | 1994-07-20 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
EP0606664A1 (en) * | 1993-01-12 | 1994-07-20 | Koninklijke Philips Electronics N.V. | Ballast circuit |
CN1050493C (en) * | 1993-01-16 | 2000-03-15 | 浙江照明电器总公司 | High power factor electronic lamp with protector for abnormal condition |
EP0621743A1 (en) * | 1993-04-23 | 1994-10-26 | Koninklijke Philips Electronics N.V. | Power factor correcting circuit |
US5404082A (en) * | 1993-04-23 | 1995-04-04 | North American Philips Corporation | High frequency inverter with power-line-controlled frequency modulation |
US5410221A (en) * | 1993-04-23 | 1995-04-25 | Philips Electronics North America Corporation | Lamp ballast with frequency modulated lamp frequency |
EP0679046A1 (en) * | 1994-03-25 | 1995-10-25 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit for operating low-pressure discharge lamps |
US5521467A (en) * | 1994-03-25 | 1996-05-28 | Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh | High power factor, high-frequency operating circuit for a low-pressure discharge lamp |
US5608295A (en) * | 1994-09-02 | 1997-03-04 | Valmont Industries, Inc. | Cost effective high performance circuit for driving a gas discharge lamp load |
WO1996008124A1 (en) * | 1994-09-02 | 1996-03-14 | Valmont Industries, Inc. | Circuit for driving a gas discharge lamp load |
EP2104402A1 (en) * | 2008-03-17 | 2009-09-23 | Chuan Shih Industrial Co., Ldt. | Electronic ballast for fluorescent lamps |
US10103631B2 (en) | 2014-03-24 | 2018-10-16 | Redisem Ltd. | Power converter circuit and method thereof |
WO2018137240A1 (en) | 2017-01-26 | 2018-08-02 | Redisem Ltd. | Power converter circuit |
US11309790B2 (en) | 2017-01-26 | 2022-04-19 | Redisem Ltd. | Power converter circuit |
Also Published As
Publication number | Publication date |
---|---|
GB2256099A (en) | 1992-11-25 |
GB2256099B (en) | 1994-10-19 |
GB9209421D0 (en) | 1992-06-24 |
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