WO1999012402A1 - Circuit arrangement - Google Patents
Circuit arrangement Download PDFInfo
- Publication number
- WO1999012402A1 WO1999012402A1 PCT/IB1998/001302 IB9801302W WO9912402A1 WO 1999012402 A1 WO1999012402 A1 WO 1999012402A1 IB 9801302 W IB9801302 W IB 9801302W WO 9912402 A1 WO9912402 A1 WO 9912402A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- winding
- circuit arrangement
- magnetic loop
- closed magnetic
- lamp
- Prior art date
Links
- 238000004804 winding Methods 0.000 claims abstract description 52
- 230000004907 flux Effects 0.000 claims description 17
- 230000001939 inductive effect Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 7
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 102100040837 Galactoside alpha-(1,2)-fucosyltransferase 2 Human genes 0.000 abstract description 7
- 101000893710 Homo sapiens Galactoside alpha-(1,2)-fucosyltransferase 2 Proteins 0.000 abstract description 7
- 101000882406 Staphylococcus aureus Enterotoxin type C-1 Proteins 0.000 abstract description 7
- 101000882403 Staphylococcus aureus Enterotoxin type C-2 Proteins 0.000 abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 abstract description 6
- 238000009877 rendering Methods 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 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
- H05B41/2825—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 by means of a bridge converter in the final stage
- H05B41/2827—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 by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
Definitions
- the invention relates to a circuit arrangement for supplying a load by means of a high-frequency current, provided with a DC-AC converter comprising a first input terminal and a second input terminal for connection to a supply voltage source, - a series arrangement of a first and a second switching element, a first end of said series arrangement being coupled to the first input terminal and a second end being coupled to the second input terminal, a load branch which shunts one of the switching elements and which is provided with: - connection terminals for holding the lamp, a control transformer which comprises a first closed magnetic loop of magnetizable material around which a primary winding, a first secondary winding coupled to the first switching element, and a second secondary winding coupled to the second switching element are provided, - inductive means provided with a magnetizable core having two ends and with at least a winding Lb which is provided around the magnetizable core between the two ends in series with the primary winding of the control transformer.
- the invention also relates to an inductive component and to a compact lamp.
- a circuit arrangement as mentioned in the first paragraph is known from US 5,434,480.
- the known circuit arrangement is widely used for supplying low-pressure mercury discharge lamps. These are often so-called compact fluorescent lamps with the supply circuit integrated in the lamp. Such compact fluorescent lamps have a high luminous efficacy and are very widely used in locations where traditionally incandescent lamps were used.
- a disadvantage of the known circuit arrangement is that it consists of a comparatively large number of components. Owing to this large number of components of the circuit arrangement, it is comparatively complicated to assemble the circuit arrangement and to integrate it in the compact fluorescent lamp.
- the invention has for its object to provide a circuit arrangement which consists of a comparatively small number of components.
- a circuit arrangement as mentioned in the opening paragraph is for this purpose characterized in that the ends of the magnetizable core are connected to the first closed magnetic loop by means of a magnetizable material such that the two secondary windings are provided around a part of the first closed magnetic loop in which the fluxes generated by the winding Lb and the primary winding reinforce one another during operation of the circuit arrangement.
- the control transformer and the inductive means have been integrated into one inductive component in a circuit arrangement according to the invention.
- the process of assembling a circuit arrangement according to the invention and its integration in a compact lamp are comparatively simple as a result of this.
- the inductive means may comprise a ballast coil.
- inductive means which comprise a transformer.
- the winding Lb forms a primary winding of this transformer.
- the connection terminals for holding a lamp are coupled to a secondary winding of the transformer.
- the magnetizable core may be provided with an air gap. It is achieved thereby that the magnetic flux in the magnetizable core is comparatively small even for a comparatively strong current through the winding Lb, so that the magnetizable core cannot reach the saturated state and the inductive means operate in the desired manner.
- a comparatively simple, and thus comparatively inexpensive manner of jointly forming the first closed magnetic loop and the magnetizable core is by means of two E-cores.
- a circuit arrangement according to the invention is highly suitable for use in the electronic ballast of a compact lamp, more in particular a compact low-pressure mercury lamp comprising - a light source provided with a lamp vessel which is closed in a gastight manner and which transmits visible light, a housing which is fastened to the light source and is provided with a lamp cap, an electronic ballast which is electrically connected to the light source so as to supply this light source and which is accommodated in a space surrounded by the housing.
- Fig. 1 shows an embodiment of an inductive component according to the invention
- Fig. 2 shows an embodiment of a circuit arrangement according to the invention which comprises an inductive component as shown in Fig. 1 with a lamp connected to it;
- Fig. 3 shows an embodiment of a compact lamp according to the invention.
- M is a structure of magnetizable material formed by means of two E-cores.
- the structure consists of two parallel legs PI and P2 which are interconnected by transverse legs Zl, Z2 and Z3.
- Lprim, SEC1 and SEC2 are a primary winding and a first and a second secondary winding of a control transformer, respectively. These windings are provided around the transverse leg Zl.
- the transverse leg Zl forms a first closed magnetic loop together with leg PI, leg P2, and transverse leg Z3.
- the first closed magnetic loop together with the windings Lprim, SEC1 and SEC2 forms a control transformer.
- the transverse leg Z2 forms a magnetizable core.
- Lb is a winding which in this embodiment forms a ballast coil together with the transverse leg Z2.
- Ls is an air gap in the transverse leg Z2.
- the first E-core comprises the leg PI and half of each of the transverse legs Zl , Z2 and Z3.
- the second E-core comprises the leg P2 and half of each of the transverse legs Zl , Z2 and Z3.
- RV1 is a plane which intersects the transverse leg Z3 perpendicularly and in which the first and the second E-core touch one another.
- RV2 is a plane which intersects the transverse leg Zl perpendicularly and in which the first and the second E-core touch one another.
- Kl and K2 are a first and a second input terminal, respectively, for connection to a supply voltage source.
- Kl is connected to K2 by means of a series arrangement of a first switching element SI and a second switching element S2.
- the switching elements in this embodiment are formed by bipolar transistors.
- the switching element SI is shunted by a diode Dl
- the switching element S2 is shunted by a diode D2.
- the switching element S2 is shunted by a load branch which is formed in this embodiment by a series arrangement of the primary winding Lprim, the winding Lb, the connection terminals K3 and K4 for holding a lamp, and a capacitor Cl .
- a low-pressure mercury discharge lamp La is connected to the connection terminals K3 and K4 and is shunted by a capacitor C2. Respective ends of the secondary winding SEC1 are connected to the base and to the emitter of the switching element SI . Respective ends of the secondary winding SEC2 are connected to the base and to the emitter of the switching element S2.
- the operation of the magnetic component shown in Fig. 1 and of the circuit arrangement shown in Fig. 2 is as follows.
- This first flux is present both in the second closed magnetic loop, formed by the transverse leg Zl together with the transverse leg Z2 and those portions of the legs PI and P2 which are situated between the transverse legs Zl and Z2, and in a third closed magnetic loop formed by the transverse leg Z3 together with the transverse leg Z2 and the portions of the legs PI and P2 which are present between the transverse legs Z2 and Z3.
- the first flux is comparatively small owing to the presence of the air gap Ls in the second and in the third closed magnetic loop.
- the high-frequency AC current flowing in the load branch also causes a second flux, which is present in the first closed magnetic loop and in the second closed magnetic loop, via the primary winding Lprim of the control transformer.
- the portion of the second flux which is present in the second closed magnetic loop is comparatively small on account of the presence of the air gap Ls.
- the total second flux is comparatively great because the first closed magnetic loop does not have an air gap.
- the first and the second flux reinforce one another in transverse leg Zl and transverse leg Z2, and cancel one another out partly in transverse leg Z3. Since the total flux, which is equal to the sum of the first flux and the second flux, reaches its highest value in the transverse leg Zl, the latter can enter the saturated state whereas the transverse leg Z2 and the transverse leg Z3 do not become saturated.
- the voltages which are present between ends of the secondary windings SEC1 and SEC2 drop comparatively quickly as a result of the saturation of the transverse leg Zl.
- reference numeral 8 denotes a portion of a lamp vessel which is sealed in a gastight manner and which transmits visible light.
- a wall 6 of a housing is connected to the lamp vessel 8 and is provided with a lamp cap 3, while a circuit arrangement B according to the invention is present in a space 7 enclosed by the housing.
- the circuit arrangement is diagrammatically indicated as consisting of components P and Cl to C4.
- Connection wires 9 extend between the circuit arrangement and electrodes (not shown) in the lamp vessel.
- E denotes connection wires between the circuit arrangement and the electrical contacts 1 and 2 arranged on the lamp cap.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98937713A EP0981933A1 (en) | 1997-09-01 | 1998-08-21 | Circuit arrangement |
JP51649899A JP2001504984A (en) | 1997-09-01 | 1998-08-21 | Circuit device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97202684 | 1997-09-01 | ||
EP97202684.3 | 1997-09-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999012402A1 true WO1999012402A1 (en) | 1999-03-11 |
Family
ID=8228691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB1998/001302 WO1999012402A1 (en) | 1997-09-01 | 1998-08-21 | Circuit arrangement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0981933A1 (en) |
JP (1) | JP2001504984A (en) |
CN (1) | CN1237321A (en) |
WO (1) | WO1999012402A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107123517B (en) * | 2013-01-08 | 2019-02-15 | 美的集团股份有限公司 | Inductive component |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4484108A (en) * | 1982-08-02 | 1984-11-20 | North American Philips Corporation | High frequency ballast-ignition system for discharge lamps |
US4559478A (en) * | 1983-06-28 | 1985-12-17 | U-Lite, Inc. | Fluorescent lamp circuit |
US5434480A (en) * | 1993-10-12 | 1995-07-18 | Bobel; Andrzej A. | Electronic device for powering a gas discharge road from a low frequency source |
-
1998
- 1998-08-21 WO PCT/IB1998/001302 patent/WO1999012402A1/en not_active Application Discontinuation
- 1998-08-21 CN CN 98801272 patent/CN1237321A/en active Pending
- 1998-08-21 EP EP98937713A patent/EP0981933A1/en not_active Withdrawn
- 1998-08-21 JP JP51649899A patent/JP2001504984A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4484108A (en) * | 1982-08-02 | 1984-11-20 | North American Philips Corporation | High frequency ballast-ignition system for discharge lamps |
US4559478A (en) * | 1983-06-28 | 1985-12-17 | U-Lite, Inc. | Fluorescent lamp circuit |
US5434480A (en) * | 1993-10-12 | 1995-07-18 | Bobel; Andrzej A. | Electronic device for powering a gas discharge road from a low frequency source |
Also Published As
Publication number | Publication date |
---|---|
CN1237321A (en) | 1999-12-01 |
EP0981933A1 (en) | 2000-03-01 |
JP2001504984A (en) | 2001-04-10 |
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