WO2011070843A1 - Dispositif d'onduleur, dispositif d'éclairage d'appareil d'affichage le comportant et appareil d'affichage - Google Patents

Dispositif d'onduleur, dispositif d'éclairage d'appareil d'affichage le comportant et appareil d'affichage Download PDF

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Publication number
WO2011070843A1
WO2011070843A1 PCT/JP2010/067331 JP2010067331W WO2011070843A1 WO 2011070843 A1 WO2011070843 A1 WO 2011070843A1 JP 2010067331 W JP2010067331 W JP 2010067331W WO 2011070843 A1 WO2011070843 A1 WO 2011070843A1
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WO
WIPO (PCT)
Prior art keywords
inverter
inverter device
discharge tube
display device
frequency
Prior art date
Application number
PCT/JP2010/067331
Other languages
English (en)
Japanese (ja)
Inventor
慎司 松本
Original Assignee
シャープ株式会社
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
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to US13/512,639 priority Critical patent/US20120242244A1/en
Publication of WO2011070843A1 publication Critical patent/WO2011070843A1/fr

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    • 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

Definitions

  • the present invention relates to an inverter device for driving a plurality of discharge tube lamps, a lighting device for a display device including the inverter device, and a display device.
  • the inverter device used for the display device lighting device applies a high frequency high voltage to each of the plurality of discharge tube lamps to drive the plurality of discharge tube lamps.
  • the plurality of discharge tube lamps are turned on, and the display device illumination device functions as the illumination device.
  • FIG. 7 shows a configuration example of a conventional general inverter device that performs the in-phase driving operation.
  • the inverter device shown in FIG. 7 is an inverter device for driving six discharge tube lamps (for example, cold-cathode tube lamps) L1 to L6, and the DC input voltage Vin is a high-frequency (for example, several tens of kHz) AC voltage.
  • DC / AC converters 1-1 to 1-6 for converting to DC / AC, booster 2-k for boosting output voltage Vk of DC / AC converter 1-k and applying it to discharge tube lamp Lk, and DC / AC
  • a control unit 3 ′ for controlling the conversion units 1-1 to 1-6.
  • k is a natural number from 1 to 6.
  • the control unit 3 ′ controls the DC / AC conversion units 1-1 to 1-6 so that the output voltages V1 to V6 of the DC / AC conversion units 1-1 to 1-6 have the same frequency and the same phase. is doing. As a result, the output voltages (lamp applied voltages) VL1 to VL6 of the boosters 2-1 to 2-6 have the same frequency and the same phase as shown in FIG.
  • the output voltages (lamp applied voltages) VL1 to VL6 of the boosters 2-1 to 2-6 have the same frequency and the same phase, they are generated from the transformers of the boosters 2-1 to 2-6.
  • the frequency of electromagnetic waves (unwanted radiation) is also the same or an integral multiple, and as a result, the peak value of unwanted radiation increases at a predetermined frequency (driving frequency of each transformer of the boosters 2-1 to 2-6). there were.
  • Patent Document 1 this is equivalent to a period T / N in which the phase of each lamp application voltage is divided by the number N of discharge tube lamps with respect to one cycle T in the lamp application voltage without performing the in-phase driving operation.
  • an inverter device that prevents the occurrence of noise due to leakage current by sequentially shifting the phase differences.
  • the inverter device proposed in Patent Document 1 prevents the generation of noise due to leakage current, and does not prevent the peak value of unnecessary radiation from increasing at a predetermined frequency.
  • an object of the present invention is to provide an inverter device that can reduce the peak of unnecessary radiation, a lighting device for a display device including the inverter device, and a display device.
  • an inverter device includes a plurality of transformers, and uses the output voltages of the plurality of transformers as applied voltages applied to a plurality of discharge tube lamps, respectively.
  • the drive frequencies of the plurality of transformers may have different values.
  • an illumination device for a display device includes the inverter device having any one of the above-described configurations and a plurality of discharge tube lamps driven by the inverter device.
  • the display device according to the present invention is provided with the illumination device for a display device having the above configuration.
  • the display device may be a television receiver.
  • the peak point of unnecessary radiation is smoothed and the peak value of unnecessary radiation is reduced.
  • FIG. 1 It is a figure which shows the structure of the inverter apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of 1 structure of a DC / AC conversion part. It is a figure which shows the unnecessary radiation of the inverter apparatus shown in FIG. 1, and the unnecessary radiation of the inverter apparatus shown in FIG. It is a back side perspective view of the illuminating device for display apparatuses which concerns on one Embodiment of this invention. It is a front view of the illuminating device for display apparatuses which concerns on one Embodiment of this invention. It is a disassembled perspective view of the liquid crystal television receiver which is an example of the display apparatus which concerns on this invention. It is a figure which shows the structural example of the conventional general inverter apparatus which performs in-phase drive operation
  • FIG. 1 shows a configuration of an inverter device according to an embodiment of the present invention.
  • the same parts as those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the inverter device according to an embodiment of the present invention shown in FIG. 1 is configured by removing the control unit 3 ′ from the conventional general inverter device that performs the same phase driving operation shown in FIG. It is a configuration. Details of the control unit 3 will be described later.
  • FIG. 2 shows a configuration example of the DC / AC converter 1-1 included in the inverter device according to the embodiment of the present invention shown in FIG.
  • the DC / AC converter 1-1 is a push-pull DC / AC converter circuit, which includes switching elements Q1 and Q2, resistors R1 and R2, a capacitor C1, a transformer T1, And a low-pass filter circuit F1.
  • Each of the switching elements Q1 and Q2 is composed of an N-channel enhancement type MOS transistor and a feedback diode connected in antiparallel to the transistor.
  • a first PWM (Pulse Width Modulation) control signal CNT1 output from the control unit 3 (see FIG. 1) is supplied to the gate of the switching element Q1 via the resistor R1 and is output from the control unit 3
  • the bar CNT1 is supplied to the gate of the switching element Q2 via the resistor R2. Since the first inverted PWM control signal bar CNT1 is an inverted signal of the first PWM control signal CNT1, the switching elements Q1 and Q2 are switched between the ON state and the OFF state in a complementary manner.
  • the transformer T1 has a primary winding NP and a secondary winding NS, and a center tap CT is provided in the primary winding NP.
  • the drain of the switching element Q1 and one end of the capacitor C1 are connected to one end of the primary winding NP, the drain of the switching element Q2 and the other end of the capacitor C2 are connected to the other end of the primary winding NP, and the switching element Q1
  • the source and the source of the switching element Q2 are commonly connected.
  • a DC input voltage Vin is applied between the common connection point and the center tap CT.
  • a connection line between the drain of the switching element Q1 and one end of the primary winding NP, and a connection line between the source of the switching element Q1 and the source of the switching element Q2 The current flows alternately to each other, and the direction of the current flowing through the primary winding NP is switched.
  • a rectangular waveform voltage is generated between both ends of the secondary winding NS.
  • the rectangular waveform voltage generated between both ends of the secondary winding NS is adjusted to a sine wave voltage V1 by the low-pass filter circuit F1.
  • the leakage inductor of the transformer T1 may be used as an inductor that is one component of the low-pass filter circuit F1.
  • the sine wave voltage V1 output from the DC / AC converter 1-1 is boosted by the booster 2-1 (see FIG. 1) to become a sine wave high voltage VL1, and the sine wave high voltage VL1 is the discharge tube. Applied between both ends of the lamp L1 (see FIG. 1).
  • Each configuration example of the DC / AC conversion units 1-2 to 1-6 is the same as the configuration example of the DC / AC conversion unit 1-1 illustrated in FIG.
  • the control unit 3 generates a first PWM control signal CNT1 and a first inverted PWM control signal bar CNT1 and outputs the first PWM control signal CNT1 and the first inverted PWM control signal bar CNT2 to the DC / AC converter 1-1.
  • the third PWM control signal CNT3 and the third inverted PWM control signal bar CNT3 are generated and output to the DC / AC converter 1-3, and the fourth PWM control signal CNT4 is generated and output to the DC / AC converter 1-2.
  • the fourth inverted PWM control signal bar CNT4 is generated and output to the DC / AC converter 1-4, and the fifth PWM control signal CNT5 and the fifth inverted PWM control signal bar CNT5 are generated to generate the DC / AC converter 1-. 5, the sixth PWM control signal CNT6 and the sixth inverted PWM control signal bar CNT6 are generated and output to the DC / AC converter 1-6.
  • the frequency is shifted by 1 kHz
  • control signals CNT1 to CNT6 and the bars CNT1 to CNT6 are generated. This can be easily realized by setting the PWM periods of the k-th PWM control signal CNTk and the k-th inverted PWM control signal bar CNTk to be different for each k. Note that k is a natural number from 1 to 6.
  • the peak point of unnecessary radiation is smoothed and the peak value of unnecessary radiation is reduced as compared with the conventional general inverter device shown in FIG. 7.
  • the amount of deviation between the transformer drive frequencies f1 and f2, the amount of deviation between the transformer drive frequencies f2 and f3, the amount of deviation between the transformer drive frequencies f3 and f4, the amount of deviation between the transformer drive frequencies f4 and f5, and the drive frequency of the transformer The amount of deviation between f5 and f6 is not particularly limited.
  • Each shift amount may be the same as shown in Table 1 above, or each or a part thereof may be different.
  • FIG. 4 shows a rear perspective view of a lighting device for a display device according to an embodiment of the present invention
  • FIG. 5 shows a front view thereof.
  • reference numeral 1 indicates any of reference numerals 1-1 to 1-6 (see FIG. 1)
  • reference numeral 2 indicates reference numerals 2-1 to 2-6 (see FIG. 1). Any one of them is shown, and the symbol L indicates any one of the symbols L1 to L6 (see FIG. 1).
  • the display device lighting device includes an inverter device (hereinafter, abbreviated as “inverter device”) according to an embodiment of the present invention shown in FIG. 1 and an inverter.
  • inverter device hereinafter, abbreviated as “inverter device”
  • a substrate 4, a chassis 5, and six discharge tube lamps L are provided.
  • the inverter device is mounted on the inverter board 4.
  • each discharge tube lamp L is held by a first holder 6 provided on the front surface of the chassis 5, and the other end of each discharge tube lamp L is held by a second holder 7 provided on the front surface of the chassis 5. ing. Further, six connectors 8 are provided at positions corresponding to the first holder 6 on the rear surface of the chassis 5. Each one end side terminal of each discharge tube lamp L is electrically connected to the connector terminal of each connector 8 via each conductive first holder 6, and the other end side terminal of each discharge tube lamp L is conductive.
  • the second holder 7 is commonly connected to the ground potential.
  • an inverter-side connector (not shown) that is paired with the connector 8 is provided on the surface opposite to the mounting surface of the inverter device.
  • One output terminal of each booster 2 is electrically connected to the connector terminal of each inverter side connector, and the other output terminal of each booster 2 is connected to the ground potential.
  • each connector 8 of the chassis 5 and each inverter side connector (not shown) of the inverter board 4 are connected.
  • the plurality of discharge tube lamps L can be driven by the inverter device.
  • a display device includes the display device illumination device according to the embodiment of the present invention shown in FIGS. 4 and 5 and a display panel.
  • the display device illumination device according to the embodiment of the present invention shown in FIGS.
  • a transmissive liquid crystal display device provided with a display panel can be given.
  • FIG. 6 shows an example of an exploded perspective view when the display device according to the embodiment of the present invention is a liquid crystal television receiver.
  • a transmissive liquid crystal display unit 11, a tuner 12, and a power source 13 are stored between the front cabinet 9 and the back cabinet 10, and the back cabinet 10 is held by a stand 14.
  • the transmissive liquid crystal display unit 11 uses a display device illumination device according to an embodiment of the present invention shown in FIGS. 4 and 5 as a backlight unit, and is provided with a liquid crystal display panel on the front surface.
  • the power source 13 converts a commercial AC voltage into a DC voltage and supplies the DC voltage to each part such as the transmissive liquid crystal display unit 11 and the tuner 12.
  • a filter circuit or the like may be provided between each of the boosting units 2-1 to 2-6 and the discharge tube lamps L1 to L6 of the inverter device according to the embodiment of the present invention.
  • the inverter device of the present invention can be used to drive a plurality of discharge tube lamps.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention porte sur un dispositif d'onduleur, qui comporte une pluralité de transformateurs et qui est utilisé pour commander une pluralité de lampes à tube à décharge (L1-L6) par utilisation de chacune des tensions de sortie (VL1-VL6) de la pluralité de transformateurs comme tensions devant être appliquées à la pluralité de lampes à tube à décharge (L1-L6), respectivement, au moins l'une des fréquences de commande de la pluralité de transformateurs étant amenée à avoir une valeur différente des autres fréquences de commande.
PCT/JP2010/067331 2009-12-10 2010-10-04 Dispositif d'onduleur, dispositif d'éclairage d'appareil d'affichage le comportant et appareil d'affichage WO2011070843A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/512,639 US20120242244A1 (en) 2009-12-10 2010-10-04 Inverter device and illumination device for use in display device incorporating same and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009280802 2009-12-10
JP2009-280802 2009-12-10

Publications (1)

Publication Number Publication Date
WO2011070843A1 true WO2011070843A1 (fr) 2011-06-16

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PCT/JP2010/067331 WO2011070843A1 (fr) 2009-12-10 2010-10-04 Dispositif d'onduleur, dispositif d'éclairage d'appareil d'affichage le comportant et appareil d'affichage

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WO (1) WO2011070843A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10327656B2 (en) 2010-11-26 2019-06-25 Uneeg Medical A/S Analysis of EEG signals to detect hypoglycaemia

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107959993A (zh) * 2016-10-14 2018-04-24 台达电子工业股份有限公司 广告看板用照明电源系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08146198A (ja) * 1994-11-25 1996-06-07 Ushio Inc 誘電体バリア放電装置
JP2009277642A (ja) * 2008-05-16 2009-11-26 Ampower Technology Co Ltd ランプ制御システム

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002175891A (ja) * 2000-12-08 2002-06-21 Advanced Display Inc 多灯式バックライト用インバータ
US7589478B2 (en) * 2003-02-10 2009-09-15 Masakazu Ushijima Inverter circuit for discharge lamps for multi-lamp lighting and surface light source system
DE10333729A1 (de) * 2003-07-23 2005-03-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorschaltgerät für mindestens eine Hochdruckentladungslampe, Betriebsverfahren und Beleuchtungssytem für eine Hochdruckentladungslampe
US8054001B2 (en) * 2006-09-18 2011-11-08 O2Micro Inc Circuit structure for LCD backlight
US8232674B2 (en) * 2008-07-31 2012-07-31 Astec International Limited Multiple output isolated DC/DC power converters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08146198A (ja) * 1994-11-25 1996-06-07 Ushio Inc 誘電体バリア放電装置
JP2009277642A (ja) * 2008-05-16 2009-11-26 Ampower Technology Co Ltd ランプ制御システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10327656B2 (en) 2010-11-26 2019-06-25 Uneeg Medical A/S Analysis of EEG signals to detect hypoglycaemia

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