Source: http://www.google.com/patents/US7479740?dq=4052565
Timestamp: 2017-06-29 02:37:24
Document Index: 259223595

Matched Legal Cases: ['Application No. 2004', 'Application No. 2004', 'application No. 2004', 'Application No. 2004', 'application No. 2004', 'Application No. 2004', 'Application No. 2004']

Patent US7479740 - Module for parallel lighting and balancer coil for discharge lamp - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA small balancer coil for cold-cathode florescent lamps having sufficient shunt/balance effects, comprises a discharge lamp, a conductor located close to the discharge lamp, and two coils whose magnetic fluxes face each other. The magnetic fluxes generated in the coils face and cancel each other. Lamp...http://www.google.com/patents/US7479740?utm_source=gb-gplus-sharePatent US7479740 - Module for parallel lighting and balancer coil for discharge lampAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7479740 B2Publication typeGrantApplication numberUS 11/214,765Publication dateJan 20, 2009Filing dateAug 31, 2005Priority dateSep 1, 2004Fee statusLapsedAlso published asCN1767713A, CN1767713B, EP1638375A1, EP2285189A1, US7834726, US20060055338, US20090153069Publication number11214765, 214765, US 7479740 B2, US 7479740B2, US-B2-7479740, US7479740 B2, US7479740B2InventorsMasakazu UshijimaOriginal AssigneeHong-Fei ChenExport CitationBiBTeX, EndNote, RefManPatent Citations (22), Referenced by (1), Classifications (8), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetModule for parallel lighting and balancer coil for discharge lamp
US 7479740 B2Abstract
1. A balancer coil for discharge lamps comprising:
first and second coils wound around a common core in such a manner that currents flowing through the first and second coils generate respective magnetic fluxes in the core, at least one of the first and second coils being operably connected to an electrode of a respective one of the discharge lamps,
wherein, during operation of the balancer coil,
the respective magnetic fluxes are generated towards one another in the core such that the respective magnetic fluxes are substantially canceled out,
a sum of reactances of mutual inductance of the balancer coil are larger than a negative resistance of each of the discharge lamps thereby balancing currents of the discharge lamps, and
section winding or oblique winding or concentric winding is applied to each of the first and second coils of the balancer coil so as to make self-resonance frequency of each of the two coils higher than an operational frequency of the discharge lamps.
2. The shunt circuit module structured by using a plurality of the balancer coils according to claim 1, wherein the balancer coils are physically arranged in a tournament tree shape.
3. The balancer coil for discharge lamps according to claim 1, wherein windings of said balancer coil form a distributed constant type delay circuit, two ends of said windings being operably connected together, such that:
progressive waves generated, respectively, in the windings on opposing sides of the balancer coil travel in opposite directions away from each other, and
magnetic fluxes temporally delayed by the progressive waves are canceled as a result of the two ends of the windings initially affected by the progressive waves being connected together.
4. A shunt circuit module comprising a plurality of the balancer coils according to claim 1 or 3, wherein
each of the plurality of balancer coils is connected to a respective discharge lamp,
the plurality of balancer coils are mutually connected according to a cyclical formation such that, for each of the plurality of balancer coils,
a first end of the first coil is connected to an electrode of the respective discharge lamp, while a second end of the first coil is connected to a coil of another one of the plurality of balancer coils,
a first end of the second coil is connected to the second end of the first coil of another one of the plurality balancer coils, while the second end of the second coil is integrally connected to the second ends of the second coils of the remaining ones of the plurality of balancer coils.
5. The shunt circuit module according to claim 4, further comprising:
first and second wirings, the first wiring being longer and thinner than the second wiring, the lengths and thicknesses of the first and second wirings being determined such that the parasitic capacitances of the first and second wirings are substantially equal,
wherein one end of each of the first and second wirings is connected to first and second windings respectively, and the other end of each of the first and second wirings is connected to a respective discharge lamp.
6. The shunt circuit module of claim 4, wherein the shunt circuit module is configured such that
the lamp currents of the respective discharge lamps connected to the plurality of balancer coils are balanced,
a coupling coefficient of each of the plurality of balancer coils is deceased so as to increase leakage inductance and suppress a circulating current flowing between the plurality of balancer coils, and
a magnetic circuit is structured so that the magnetic fluxes generated in the cores of the plurality of the balancer coils cancel each other out.
7. The shunt circuit module according to claim 4, wherein said plurality of balancer coils are wound up around independent cores, respectively.
8. The shunt circuit module according to claim 7, wherein each of said independent cores are integrally formed into a multi-leg structure.
9. The shunt circuit module according to claim 8, further comprising connecting lines connecting the balancer coils of alternate cores in the multi-leg structure to minimize variations in the lengths of the connecting lines connecting the balancer coils are minimized, wherein the connecting lines are configured to decrease the influence of parasitic capacitance.
This application claims priority to Japanese Patent Application Nos. 2004-254129 filed on Sep. 1, 2004, 2004-348380 filed on Dec. 1, 2004 and 2005-117996 filed on Apr. 15, 2005.
The present invention is a dependent invention of the invention of Japanese Patent Application No. 2004-3740 (U.S. Patent Application 2004-155596) filed by the inventors of the present invention, and pertains to a module for parallel lighting and a balancer coil for discharge lamps for a liquid crystal display television and a surface light source.
FIG. 4 of the specification of Japanese Patent Application No. 2004-3740 (U.S. Patent application No. 2004-155596) corresponding to FIG. 20 discloses multiple balancer coils connected circulatingly. FIG. 6 of the specification of Japanese Patent Application No. 2004-3740 (U.S. Patent application No. 2004-155596) corresponding to FIG. 21 discloses the technique of making magnetic fluxes of three or more coils face one another.
Patent document 1: Japanese Laid-Open Patent Publication (Kokai) No. Hei 7-45393 Patent document 2: Japanese Laid-Open Patent Publication (Kokai) No. 2003-31383 (U.S. Pat. No. 6,717,372B2) Patent document 3: Japanese Patent Application No. 2004-3740 (U.S. Patent Application Publication No. 2004-155596) Patent document 4: Japanese Patent Application No. 2004-79571 (U.S. patent application Ser. No. 11/081,545) Patent document 5: Japanese Patent No. 3291852 Patent document 6: Chinese (TAIWAN) Patent No. 521947 Specification SUMMARY OF THE INVENTION
The present invention aims at providing a small-balancer coil having sufficient shunt/balance effects for the use of cold-cathode florescent lamps.
As apparent from the above, the shunt circuit module is effectively laid out so that the lengths of the wirings are almost equal so as to make these influences as small as possible. Specifically, the shunt circuit module requires a structure in a tournament tree shape also in a physical layout as shown in FIG. 9.
The structure shown in FIG. 2 prevents coupling coefficient from decreasing when multiple coils are connected, by taking coils adjacently facing each other as a set so as to mutually connect the set of coils circulatingly. In this case, the core of this structure does not necessarily have to be divided for each coil facing each other, and the entire core may be divided into two or more. In this connection method, when each coil is laid out on the circumference, the wiring between coils can be uniform. When arranging the coils in a line in a plane, the mutual distance is not necessarily equal. For example, W5, which is one of the wirings circulatingly connected and is particularly long, is strongly influenced by parasitic capacitance, so that the current balance is lost.
FIG. 6 of the publication of Japanese Laid-Open Patent Publication (Kokai) No. 2003-31383, which is described above, corresponding to FIG. 22, is actually impractical. FIG. 11 shows the method for achieving actual shunt/balance effects by further improving the example. Each of one ends of windings W1 to W4 is connected to a cold-cathode florescent lamp, and each of the other ends is bound up and integrally connected. Reference mark S1 to S5, which denote short-circuit windings, are wound up by mutually being connected so that the magnetic flux facing the magnetic flux generated in each coil of the windings W1 to W4 By such a connection, the shunt circuit module shown in FIG. 11 exhibits shunt/balance effects.
For example, when a self-inductance is 100 mH, if a coupling coefficient is 0.9, the mutual inductance is given by:
0.9×100mH=90mH
The negative resistance value of the cold-cathode florescent lamp is expressed as the inclination angle of the voltage-current characteristic as shown in FIG. 26A (at 60 kHz). Taking FIG. 26A as an example, the value is −20 kΩ (−20 V/mA).
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4572990Nov 23, 1983Feb 25, 1986International Energy Conservation SystemsElectronic transformer system for neon lampsUS6226196Mar 31, 2000May 1, 2001Murata Manufacturing Co., Ltd.Piezoelectric transformer inverterUS6310444Aug 10, 2000Oct 30, 2001Philips Electronics North America CorporationMultiple lamp LCD backlight driver with coupled magnetic componentsUS6459216Apr 16, 2001Oct 1, 2002Monolithic Power Systems, Inc.Multiple CCFL current balancing scheme for single controller topologiesUS6717372Feb 22, 2002Apr 6, 2004Ambit Microsystems Corp.Multi-lamp driving systemUS7282868 *Feb 9, 2004Oct 16, 2007Masakazu UshijimaInverter circuit for discharge lamps for multi-lamp lighting and surface light source systemUS20020125838Apr 16, 2001Sep 12, 2002Tsai Ying HsienMultiple CCFL current balancing scheme for single controller topologiesUS20020140538Dec 27, 2001Oct 3, 2002Lg. Philips Lcd Co., Ltd.Method of winding coil and transformer and inverter liquid crystal display having coil wound using the sameUS20030141829Jan 31, 2002Jul 31, 2003Shan-Ho YuCurrent equalizer assembly for LCD backlight panelUS20040155596Feb 9, 2004Aug 12, 2004Masakazu UshijimaInverter circuit for discharge lamps for multi-lamp lighting and surface light source systemUS20040183448Mar 12, 2004Sep 23, 2004Ching-Fu HsuehTransformer and voltage supply circuit thereof for lighting tubesUS20050218827Mar 17, 2005Oct 6, 2005Masakazu UshijimaParallel lighting system for surface light source discharge lampsUS20060279232 *May 9, 2006Dec 14, 2006Sony CorporationDischarge tube lighting apparatus, light source apparatus, and display apparatusCN521947A Title not availableEP1397028A1Jun 21, 2003Mar 10, 2004Minebea Co., Ltd.Ballast for a plurality of discharge lampsJP3291852B2 Title not availableJP2002164193A Title not availableJP2005317253A Title not availableJPH0745393A Title not availableTW153102B Title not availableTW521947U Title not availableTW594808B Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS20080030283 *Jul 30, 2007Feb 7, 2008Greatchip Technology Co., Ltd.Circuit, Manufacturing Method And Inverter circuit For Discharge Tube* Cited by examinerClassifications U.S. Classification315/282, 315/274, 315/276, 315/291International ClassificationH05B41/16Cooperative ClassificationH05B41/2822, Y02B20/185European ClassificationH05B41/282M2Legal EventsDateCodeEventDescriptionAug 31, 2005ASAssignmentOwner name: HONG-FEI, CHEN, TAIWANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:USHIJIMA, MASAKAZU;REEL/FRAME:016947/0075Effective date: 20050809Sep 3, 2010ASAssignmentOwner name: CHEN, HONG-FEI, TAIWANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:USHIJIMA, MASAKAZU;REEL/FRAME:024937/0738Effective date: 20050809Owner name: USHIJIMA, MASAKAZU, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:USHIJIMA, MASAKAZU;REEL/FRAME:024937/0738Effective date: 20050809Jul 5, 2012FPAYFee paymentYear of fee payment: 4Sep 2, 2016REMIMaintenance fee reminder mailedJan 20, 2017LAPSLapse for failure to pay maintenance feesMar 14, 2017FPExpired due to failure to pay maintenance feeEffective date: 20170120RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services