EP0505947A2 - Transformateur pour lampes à décharge dans un gaz - Google Patents

Transformateur pour lampes à décharge dans un gaz Download PDF

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Publication number
EP0505947A2
EP0505947A2 EP92104916A EP92104916A EP0505947A2 EP 0505947 A2 EP0505947 A2 EP 0505947A2 EP 92104916 A EP92104916 A EP 92104916A EP 92104916 A EP92104916 A EP 92104916A EP 0505947 A2 EP0505947 A2 EP 0505947A2
Authority
EP
European Patent Office
Prior art keywords
voltage winding
voltage
winding
transformer
wound
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
Application number
EP92104916A
Other languages
German (de)
English (en)
Other versions
EP0505947A3 (en
EP0505947B1 (fr
Inventor
Shintetsu Amano
Isao Hori
Fumio Ichimiya
Toshihiro Matsui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Lecip Corp
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Seisakusho KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP06649291A external-priority patent/JP3401021B2/ja
Application filed by Sanyo Electric Co Ltd, Sanyo Denki Seisakusho KK filed Critical Sanyo Electric Co Ltd
Publication of EP0505947A2 publication Critical patent/EP0505947A2/fr
Publication of EP0505947A3 publication Critical patent/EP0505947A3/en
Application granted granted Critical
Publication of EP0505947B1 publication Critical patent/EP0505947B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • 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
    • H05B41/2821—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 single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822—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 single-switch converter or a parallel push-pull 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 present invention relates to a transformer used for discharging a neon gas tube or an argon gas tube by stepping up AC power to a high voltage.
  • Fig. 1 shows a simple composition of a transformer for gas tube sign, which will hereinafter be called a neon transformer.
  • a low-voltage winding (primary winding) 12 is wound on a main iron core 11 and, separately from the low-voltage winding 12, a high-voltage winding (secondary winding) 13 is wound on the main iron core 11.
  • a leakage iron core 14 is disposed between the low-voltage winding 12 and the high-voltage winding 13.
  • the main iron core 11 is structured so that a closed magnetic circuit is composed.
  • AC power for instance utility AC power is applied between both ends of the low-voltage winding 12 to generate a high voltage between both ends of the high-voltage winding 13.
  • the neon transformer is operated to discharge and light up a neon gas tube or an argon gas tube not illustrated in Fig. 1 by said high voltage.
  • FIG. 2 A conventional high-voltage winding 13 is shown in Fig. 2 where the main iron core 11 penetrates through a bobbin 15 on which an insulated copper wire 16 is wrapped in order while intercalating interlayer paper 17 between each layer.
  • the interlayer paper 17 is intended to have complete insulation between adjacent layers of the copper wire 16.
  • a period T A represents the duration of the transient vibration, in which discharging is so unstable as creating flickering. Discharging is stabilized in a following period T B . If the transient vibration period T A is long in excess, the system will not be suitable for a gas tube sign. With a shorter gas tube connected to a neon transformer, the transient vibration period T A becomes longer.
  • each inductance L for a turn of the copper wire 16 is connected in series to each other.
  • a line capacitance Cw between each inductance L and a parallel adjacent line is also derived.
  • Such a distributed constant circuit as described above exists for each winding layer.
  • a capacitance C L may also exist between each winding layer, according to the concept of equivalent circuit.
  • a gas tube 18 is connected between both terminals of said entire distributed constant circuit.
  • each capacitance is charged alternately with positive and negative charges every half cycle of AC power. Each of such charging is activated in a resonance state of the capacitance and the inductance, while creating transient vibration.
  • a transient vibration period T A is created as shown in Fig. 3.
  • Energy charged in all capacitances Cs, Cw and C L is expressed by CV2/2 (where C and V represent a total capacitance and a voltage across both ends of the high-voltage winding 13, respectively). Therefore, the larger the total capacitance C, the higher the voltage becomes while resulting in a larger amount of charges supplied to each capacitance. Also, time to supply the charges is made longer. In other words, the larger the capacitance component of the high-voltage winding 13, the longer the transient vibration period T A results. Furthermore, a higher voltage V brings about a longer transient vibration period T A .
  • An object of the present invention is to provide a neon transformer of which the lighting capability can be improved while making the length of a connectable gas tube (number of gas tubes) larger.
  • Another object of the present invention is to offer such a neon transformer as easily manufactured.
  • the high-voltage winding is wound in 4 or more split sections without intercalating any interlayer paper.
  • the high-voltage winding is wound on a coil bobbin comprising a cylindrical drum with a plurality of flanges disposed in an axial direction on the outer periphery thereof.
  • the high-voltage winding is split and wound on the drum.
  • compound impregnation accelerating portions that are shaped in an elevated or recessed form while extending from the outer fringes thereof up to the drum. Said compound impregnation accelerating portions are composed in extension on the peripheral surface of the drum.
  • FIG. 5 shows an example of the high-voltage winding, an essential portion of the embodiment according to the present invention.
  • a main iron core 11 is penetrated into a cylindrical drum 15a of a bobbin 15.
  • the bobbin 15 is composed in such a manner that, on the cylindrical drum 15a, there are flanges 21 at both ends and 4 flanges 22 provided integratedly on the outer periphery of the drum 15a while dividing a space between the flanges 21 at both ends into 5 equal sections in the axial direction.
  • An insulated copper wire (for example, a polyvinyl formal or other low-dielectric-constant material insulated copper wire) 16 is wrapped in order by a predetermined number of layers without intercalating any interlayer paper, in a terminal section as separated by the flanges on the outer periphery of the drum 15a.
  • the copper wire is wound for the adjacent section thereto, while winding the copper wire sequentially in following sections in the same way.
  • the high-voltage winding 13 is divided into 5 sections where the copper wire is wrapped in this embodiment.
  • An inductance L of a turn of the winding is the same as that of a conventional transformer.
  • a capacitance Cs to the casing and a capacitance Cw between lines are also the same as those in a conventional transformer.
  • an interlayer capacitance of the embodiment becomes a value peculiar to each section of divisional winding, namely a capacitance C L ' smaller than a conventional value.
  • the interlayer capacitance C L ' becomes one fifth of the conventional interlayer capacitance C L shown in Fig. 4, by ignoring the affect of the interlayer paper. Since five these sections are connected in series, the whole interlayer capacitance becomes 1/25 of the conventional interlayer capacitance C L . Because no interlayer paper is used actually according to the present invention, the value becomes larger than the above.
  • a capacitance C of the neon transformer, when looked from the load side, is determined mainly by C L ' and Cw. Therefore, according to the present invention, the capacitance C of the high-voltage winding 13 is made smaller than conventional values. Consequently, a transient vibration period T A of the embodiment becomes shorter than conventional values.
  • a lighting capability of a neon tube is improved to have a length of a connectable gas tube (or a number of gas tubes) made larger.
  • a neon transformer with 2-split winding is also used to reduce an interlayer voltage.
  • a lighting capability of an ordinary neon transformer is expressed in a maximum length of lighted tube when a rated voltage is applied, the length of all connected neon or argon gas tubes is actually limited at a maximum length about 0.8 - 0.9 times as large as said maximum length of lighted tube in considering performance variances in manufacturing the neon or argon gas tubes, regulations of power supply voltage and the fluctuation of the characteristics of the neon transformer and so on.
  • a necessary condition with neon gas tubes is a minimum number of split sections of 4 in the high-voltage winding with neon gas tubes in a minimum secondary voltage of 8 kV and a minimum secondary short-circuit current of 20 mA or those in a minimum secondary voltage of 6 kV and a minimum secondary short-circuit current of 30 mA.
  • a minimum necessary number of split sections for the high-voltage winding is 4 in a minimum secondary voltage of 5 kV and a minimum secondary short-circuit current of 20 mA or in a minimum secondary voltage of 4 kV and a minimum secondary short-circuit current of 30 mA.
  • Methods to connect the high-voltage winding 13 in operation are classified into three types; first, it is not connected to the ground; second, one end of the high-voltage winding 13 is connected to the transformer casing that is grounded; and a center point thereof is grounded because harmful electric shock may occur with a secondary short-circuit current of 25 mA or more, thirdly.
  • connection details are shown in Fig. 9 where a low-voltage winding 12 is wound on the main iron core 11.
  • split high-voltage windings 13a and 13b are wound on the main iron core 11, while leakage iron cores 15a and 15b being positioned in between the low-voltage winding 12 and the high-voltage windings 13a and 13b.
  • a connection point between the high-voltage windings 13a and 13b, namely a center point of the high-voltage winding 13 is connected to for instance the transformer casing and electrically grounded as shown in Fig. 10.
  • each of the high-voltage windings 13a and 13b is wound in two or more split sections because the high-voltage winding 13 is divided into the high-voltage windings 13a and 13b.
  • the neon transformer according to the present invention as described above is housed in a cylindrical casing 31 of which one end is opened and the other end is closed, as a transformer unit 32 as shown in Fig. 11.
  • a 3-leg iron core is made of silicon steel sheets.
  • the high-voltage winding 13 is wounded and supported thereby.
  • a space remaining in the casing 31, except for the transformer unit 32, is filled with an insulating compound 35.
  • Said insulating compound 35 comprises a low-viscosity resin (Epoxy, etc.) and a filler (insulation particles such as silicon sand, etc.) which are filled in the casing 31 and then hardened by heating.
  • a coil bobbin 15 comprises a drum 15a with a square-cylindrical section, on which a copper wire 16 is wound, and flanges 21 and 22 formed in plurality (in this case, 7 pieces) equipped on the outer periphery of said drum 15a.
  • Said flanges 21 and 22 are formed substantially in a square shape with equal intervals along an axial direction of the drum 15a.
  • Grooves 36 are provided as recesses to accelerate the impregnation of the insulating compound 35 from the outer fringes of each opposite surface of the flanges 21 and 22, up to the outer periphery of the drum 15a.
  • Each groove 36 is formed to have a semi-circular section.
  • each groove 36 is structured so that each groove 36 on both surfaces of a flange 22 is dislocated from each other. Also, each groove 36 is extended as a groove 37 on the outer periphery of the drum 15a in an axial direction thereof from a position on the drum 15a to another position thereon while arriving at another flange.
  • the diameter of the copper wire 16 is 50 ⁇ m to 100 ⁇ m, approximately and wound on the bobbin 15 by for instance several million turns.
  • a winding start portion 16a of the copper wire 16 is located near the drum 15a and a winding end portion 16b is positioned near an outer fringe of the flange 21.
  • a pair of lead wires 16c led out of the copper wire 16 is connected to a pair of output terminals 38 in the secondary side as shown in Fig. 11.
  • a low-voltage winding 12 is wound and supported in a lower part of the high-voltage winding 13, with a separating gap.
  • Lead wires (not illustrated) of said low-voltage winding 12 are connected to a power-factor improvement capacitor 39 and input lead wires, not illustrated.
  • a pair of insulation spacers 41 is inserted and disposed to insulate them.
  • a pair of leakage iron cores 14 is mounted and disposed between said insulation spacers 41 and the low-voltage winding 12.
  • an input unit 42 incorporating a fuse, etc. and a bushing 43 to insulate the output terminals 38.
  • the transformer unit 32, etc. When the transformer unit 32, etc. are housed into the casing 31 while charging the insulating compound 35 into the remaining space, the insulating compound 35 is impregnated between each turn of the wire of the high-voltage winding 13.
  • the insulating compound 35 is impregnated from the flanges 21 and 22 toward the drum 15a through the grooves 36 and 37. Consequently, the high-voltage winding 13 is completely and satisfactorily impregnated with the insulating compound 35 between each turn of the wires which are completely insulated eventually.
  • the winding must be insulated by impregnating a varnish under a reduced pressure. At that time, the winding should be treated through various processes including preparatory drying, impregnation of varnish and hardening by heating, requiring a minimum processing time as long as three days.
  • a varnish insulating process can be omitted and the transformer unit 32 can be housed directly into the casing 31 and then insulated. Thus, a work efficiency can be improved while reducing a manufacturing cost in the stage of products in process.
  • elevations 44 and 45 shown in Fig. 14 and 15 may also be provided in place of the grooves 36 and 37.
  • Said elevations 44 and 45 have semi-circular sections and are formed in three rows in each quadrant of the flanges 21 and 22 (4 quadrants in this embodiment).
  • the elevations 44 are projected in opposition to each other on both surfaces of a flange 22.
  • the copper wire 10 is wound on the drum 15a so that it engages with the peaks of the elevations 44 and 45.
  • the shapes of the grooves 36 and 37 and the elevations 44 and 45 may also be shaped otherwise, for instance in a triangular section. It is also possible to provide a plurality of sets of several grooves 36 and 37 in contact with each other. Furthermore, the grooves 37 and the elevations 45 can also be formed obliquely to an axial center. The grooves 36 and 37 may also be formed substantially on all flanges.
  • the high-voltage winding is wound in four or more split sections. Therefore, an interlayer capacitance can be reduced considerably. Thereby, a maximum length of lighted tube can be made larger than that of a conventional winding, by a length of a back border tube. Therefore, the number of neon gas tubes or argon gas tubes required for a gas tube sign board can be reduced resulting in more easy and simple construction work.
  • an automatic winding machine can be used because no interlayer paper is used, so manufacturing becomes easier.
  • the effect of the present invention is significant even at a lower voltage.
  • a varnish-impregnating process is no longer required according to the present invention, by constructing a recessed or elevated accelerating portion to accelerate impregnating an insulating compound.
  • the neon transformer can be manufactured at lower cost during shorter manufacturing time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP92104916A 1991-03-29 1992-03-20 Transformateur pour lampes à décharge dans un gaz Expired - Lifetime EP0505947B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP66492/91 1991-03-29
JP06649291A JP3401021B2 (ja) 1991-03-29 1991-03-29 ネオン変圧器
JP10083491 1991-12-06
JP100834/91U 1991-12-06

Publications (3)

Publication Number Publication Date
EP0505947A2 true EP0505947A2 (fr) 1992-09-30
EP0505947A3 EP0505947A3 (en) 1994-03-09
EP0505947B1 EP0505947B1 (fr) 1996-12-27

Family

ID=26407677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104916A Expired - Lifetime EP0505947B1 (fr) 1991-03-29 1992-03-20 Transformateur pour lampes à décharge dans un gaz

Country Status (4)

Country Link
EP (1) EP0505947B1 (fr)
KR (1) KR960001143B1 (fr)
DE (1) DE69216128T2 (fr)
ES (1) ES2095973T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698480A1 (fr) * 1992-11-25 1994-05-27 Meitaku Syst Kk Transformateur haute-tension et circuit d'éclairage utilisant ce transformateur haute-tension.
EP0647086A1 (fr) * 1993-08-30 1995-04-05 Ushijima, Masakazu Circuit onduleur utilisé avec un tube à décharge
WO1999055124A1 (fr) * 1998-04-18 1999-10-28 Manfred Diez Procede permettant de faire fonctionner des lampes a decharge en atmosphere gazeuse, et configuration destinee a l'application d'un tel procede
EP0702506B1 (fr) * 1994-09-14 1999-12-01 Giuseppe and ZANARDO Luciano trading under the trading style PHOTO ELECTRONICS S.n.c. di Zanardo Giuseppe & C. ZANARDO Dispositif pour l'amorçage et le réamorçage à chaud de lampes à décharge
EP1138637A1 (fr) * 1998-11-19 2001-10-04 Jem Co. Ltd. Dispositif emetteur d'electrons et electrode emettrice d'electrons
EP1441252A1 (fr) * 2001-11-30 2004-07-28 West Electric Co., Ltd. Appareil stroboscopique et procede de fabrication associe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547705A (en) * 1982-03-20 1985-10-15 Tdk Corporation Discharge lamp lightening device
US4639706A (en) * 1984-10-30 1987-01-27 Sanyo Electric Co., Ltd. Flyback transformer
US4667132A (en) * 1986-03-03 1987-05-19 Dianalog Systems, Inc. Electronic transformer system for neon lamps
EP0320018A1 (fr) * 1987-12-10 1989-06-14 VOGT electronic Aktiengesellschaft Bobine de réactance
DD292104A5 (de) * 1990-02-21 1991-07-18 Fahrzeugelektrik Chemnitz,De Zuendspule mit offenem eisenkreis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547705A (en) * 1982-03-20 1985-10-15 Tdk Corporation Discharge lamp lightening device
US4639706A (en) * 1984-10-30 1987-01-27 Sanyo Electric Co., Ltd. Flyback transformer
US4667132A (en) * 1986-03-03 1987-05-19 Dianalog Systems, Inc. Electronic transformer system for neon lamps
EP0320018A1 (fr) * 1987-12-10 1989-06-14 VOGT electronic Aktiengesellschaft Bobine de réactance
DD292104A5 (de) * 1990-02-21 1991-07-18 Fahrzeugelektrik Chemnitz,De Zuendspule mit offenem eisenkreis

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698480A1 (fr) * 1992-11-25 1994-05-27 Meitaku Syst Kk Transformateur haute-tension et circuit d'éclairage utilisant ce transformateur haute-tension.
GB2273001A (en) * 1992-11-25 1994-06-01 Meitaku Syst Kk High-voltage transformer and lighting circuit
EP0647086A1 (fr) * 1993-08-30 1995-04-05 Ushijima, Masakazu Circuit onduleur utilisé avec un tube à décharge
US5495405A (en) * 1993-08-30 1996-02-27 Masakazu Ushijima Inverter circuit for use with discharge tube
EP0702506B1 (fr) * 1994-09-14 1999-12-01 Giuseppe and ZANARDO Luciano trading under the trading style PHOTO ELECTRONICS S.n.c. di Zanardo Giuseppe & C. ZANARDO Dispositif pour l'amorçage et le réamorçage à chaud de lampes à décharge
WO1999055124A1 (fr) * 1998-04-18 1999-10-28 Manfred Diez Procede permettant de faire fonctionner des lampes a decharge en atmosphere gazeuse, et configuration destinee a l'application d'un tel procede
EP1138637A1 (fr) * 1998-11-19 2001-10-04 Jem Co. Ltd. Dispositif emetteur d'electrons et electrode emettrice d'electrons
EP1138637A4 (fr) * 1998-11-19 2005-09-28 Jem Co Ltd Dispositif emetteur d'electrons et electrode emettrice d'electrons
EP1441252A1 (fr) * 2001-11-30 2004-07-28 West Electric Co., Ltd. Appareil stroboscopique et procede de fabrication associe
EP1441252A4 (fr) * 2001-11-30 2007-07-11 Panasonic Photo & Lighting Co Appareil stroboscopique et procede de fabrication associe
US7652434B2 (en) 2001-11-30 2010-01-26 Panasonic Photo & Lighting Co., Ltd. Electronic flash unit and manufacturing method thereof
EP2388647A1 (fr) * 2001-11-30 2011-11-23 Panasonic Photo & Lighting Co., Ltd. Flash électronique et son procédé de fabrication
US8339051B2 (en) 2001-11-30 2012-12-25 Panasonic Corporation Electronic flash unit and manufacturing method thereof

Also Published As

Publication number Publication date
DE69216128D1 (de) 1997-02-06
EP0505947A3 (en) 1994-03-09
KR960001143B1 (ko) 1996-01-19
ES2095973T3 (es) 1997-03-01
DE69216128T2 (de) 1997-05-22
KR920018785A (ko) 1992-10-22
EP0505947B1 (fr) 1996-12-27

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