JP2005143155A - Plasma display device - Google Patents

Plasma display device Download PDF

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Publication number
JP2005143155A
JP2005143155A JP2003374143A JP2003374143A JP2005143155A JP 2005143155 A JP2005143155 A JP 2005143155A JP 2003374143 A JP2003374143 A JP 2003374143A JP 2003374143 A JP2003374143 A JP 2003374143A JP 2005143155 A JP2005143155 A JP 2005143155A
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power supply
switching power
winding
switching
unit
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JP2003374143A
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Kazuhiko Koino
和彦 濃野
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply apparatus in which even if the partial circuit of a switching power supply is faulted, an expensive control circuit is not damaged. <P>SOLUTION: A plasma display device includes the switching power supply 1, a switching power supply 2 in which a power supply voltage is supplied to the power supply terminal of the control circuit 22 having the overvoltage protecting circuit of a control output unit 21 from this switching power source 1, and a switching transformer 24 provided in this switching power supply 2 and having a first winding 24a and a second winding 24b. A third winding 24c is provided at the primary side of the switching transformer 24, and the output of this third winding 24c is connected to the power supply terminal of the control circuit 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、主にプラズマディスプレイに使用される多出力のプラズマディスプレイ装置に関するものである。   The present invention relates to a multi-output plasma display apparatus mainly used for a plasma display.

近年、プラズマディスプレイパネル（ＰＤＰ）を用いたプラズマディスプレイは、視認性に優れた表示パネル（薄型表示デバイス）として注目されており、高精細化および大画面化が進められている。   In recent years, a plasma display using a plasma display panel (PDP) has attracted attention as a display panel (thin display device) having excellent visibility, and high definition and a large screen are being promoted.

プラズマディスプレイでは、表示駆動を行なうための駆動回路に大電流を供給する電源回路部と、プラズマディスプレイの動作制御を行なうマイクロコンピュータ（以下、マイコンという）に電源電圧を供給するための小電力しか供給しない電源回路部とを有する多出力のスイッチング電源装置が用いられる。   In a plasma display, only a small amount of power is supplied to supply a power supply voltage to a power supply circuit section that supplies a large current to a drive circuit for performing display drive and a microcomputer that controls the operation of the plasma display (hereinafter referred to as a microcomputer). A multi-output switching power supply device having a power supply circuit portion that is not used is used.

このプラズマディスプレイ用電源装置として具体的な先行技術文献情報はないが、現在製品に使用されている電源装置について、図２を用いて説明する。   Although there is no specific prior art document information as this plasma display power supply device, the power supply device currently used in the product will be described with reference to FIG.

従来の電源装置では、スイッチング電源部１とスイッチング電源部２があり、スイッチング電源部１は、スイッチング電源部２の制御出力部２１の制御回路部２２に電源を供給する。スイッチング電源部２の制御回路部２２の電源端子（以下Ｖｃｃという）２２ａは、過電圧保護回路（以下ＯＶＰという）を兼ねており、Ｖｃｃ電圧が上昇すると、制御出力部２１のトランジスタ２３をオフさせ、スイッチング電源部２の出力を止める機能を有している。   In the conventional power supply device, there are a switching power supply unit 1 and a switching power supply unit 2, and the switching power supply unit 1 supplies power to the control circuit unit 22 of the control output unit 21 of the switching power supply unit 2. The power supply terminal (hereinafter referred to as Vcc) 22a of the control circuit section 22 of the switching power supply section 2 also serves as an overvoltage protection circuit (hereinafter referred to as OVP). When the Vcc voltage rises, the transistor 23 of the control output section 21 is turned off. It has a function of stopping the output of the switching power supply unit 2.

２４は１次側に第１巻線２４ａを有し、２次側に第２巻線２４ｂを有するスイッチング電源部２のスイッチングトランス、２５はフォトカプラ、２６はエラーアンプ、２７はスイッチングトランス２４の２次側の第２巻線２４ｂに接続した整流・平滑部である。また、３はスイッチング電源部１、２と商用電源との間に接続される力率改善・整流・平滑回路である。   Reference numeral 24 denotes a switching transformer of the switching power supply unit 2 having a first winding 24 a on the primary side and a second winding 24 b on the secondary side, 25 a photocoupler, 26 an error amplifier, and 27 a switching transformer 24. A rectifying / smoothing unit connected to the second winding 24b on the secondary side. Reference numeral 3 denotes a power factor correction / rectification / smoothing circuit connected between the switching power supply units 1 and 2 and the commercial power supply.

ここで、上記構成の装置では、エラーアンプ２６やフォトカプラ２５が何らかの原因で故障した時、フィードバック信号がスイッチング電源部２の制御回路部２２に与えられなくなり、スイッチングトランス２４の１次側巻線電圧、２次側巻線電圧が上昇するが、スイッチング電源部２の制御回路部２２のＶｃｃ端子電圧は上昇しないので、スイッチング電源部２の制御出力部２１を破壊させ、スイッチング電源部２の出力は停止する。   Here, in the apparatus having the above configuration, when the error amplifier 26 or the photocoupler 25 fails for some reason, the feedback signal is not supplied to the control circuit unit 22 of the switching power supply unit 2, and the primary side winding of the switching transformer 24 is not provided. The voltage on the secondary side winding voltage rises, but the Vcc terminal voltage of the control circuit unit 22 of the switching power supply unit 2 does not rise. Therefore, the control output unit 21 of the switching power supply unit 2 is destroyed, and the output of the switching power supply unit 2 Stops.

このように従来のような構成では、フィードバック系の一部の回路が故障したとき、高価な制御回路部を破壊することになる。   As described above, in the conventional configuration, when a part of the circuit of the feedback system fails, the expensive control circuit unit is destroyed.

本発明はこのような課題を解決し、スイッチング電源部の一部の回路が故障しても高価な制御回路部を破壊することがない電源装置を提供することを目的とする。   An object of the present invention is to solve such problems and to provide a power supply device that does not destroy an expensive control circuit section even if a part of a circuit of the switching power supply section fails.

上記目的を達成するために本発明は、第１のスイッチング電源部と、この第１のスイッチング電源部から制御出力部のＯＶＰを有する制御回路部のＶｃｃに電源電圧が供給される第２のスイッチング電源部と、この第２のスイッチング電源部に設けられ第１巻線及び第２巻線を有するスイッチングトランスとを有し、前記スイッチングトランスの１次側に第３巻線を設け、その第３巻線の出力を前記制御回路部の電源端子に接続したものである。   To achieve the above object, the present invention provides a first switching power supply unit and a second switching device in which a power supply voltage is supplied from the first switching power supply unit to Vcc of a control circuit unit having an OVP of a control output unit. A power supply unit and a switching transformer provided in the second switching power supply unit and having a first winding and a second winding, and a third winding is provided on the primary side of the switching transformer, The output of the winding is connected to the power supply terminal of the control circuit section.

本発明によれば、スイッチング電源回路のフィードバック系の回路が故障して電気的にオープン状態になった時でも、制御回路部のＯＶＰを動作させることができ、他の部品が破壊することなく、安全にスイッチング電源の出力を停止させることができる。   According to the present invention, the OVP of the control circuit unit can be operated even when the feedback power supply circuit of the switching power supply circuit fails and is electrically opened, and other components are not destroyed. The output of the switching power supply can be safely stopped.

以下、本発明の一実施の形態によるプラズマディスプレイ用電源装置について、図１を用いて説明する。なお、図１において、図２に示す部分と同一部分については、同一番号を付している。   Hereinafter, a plasma display power supply device according to an embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same parts as those shown in FIG.

図１において、第１のスイッチング電源部１と第２のスイッチング電源部２があり、スイッチング電源部１は、スイッチング電源部２の制御出力部２１の制御回路部２２のＶｃｃに接続され、電源電圧を供給する。スイッチング電源部２の制御回路部２２のＶｃｃ２２ａは、過電圧保護のＯＶＰを兼ねており、Ｖｃｃ電圧が上昇すると、制御出力部２１のトランジスタ２３をオフさせ、スイッチング電源部２の出力を止める機能を有している。   In FIG. 1, there are a first switching power supply unit 1 and a second switching power supply unit 2, and the switching power supply unit 1 is connected to Vcc of the control circuit unit 22 of the control output unit 21 of the switching power supply unit 2. Supply. The Vcc 22a of the control circuit unit 22 of the switching power supply unit 2 also serves as an overvoltage protection OVP, and has a function of turning off the transistor 23 of the control output unit 21 and stopping the output of the switching power supply unit 2 when the Vcc voltage rises. doing.

スイッチング電源部２のスイッチングトランス２４の１次側には、第３巻線２４ｃを設け、整流・平滑部２８、ダイオード２９を介して、スイッチング電源部２の制御回路部２２のＶｃｃ２２ａに接続されている。   A third winding 24 c is provided on the primary side of the switching transformer 24 of the switching power supply unit 2, and is connected to the Vcc 22 a of the control circuit unit 22 of the switching power supply unit 2 via the rectifying / smoothing unit 28 and the diode 29. Yes.

また、２５はフォトカプラ、２６はエラーアンプ、２７はスイッチングトランス２４の２次側の第２巻線２４ｂに接続した整流・平滑部である。また、３はスイッチング電源部１、２と商用電源との間に接続される力率改善・整流・平滑回路である。   Reference numeral 25 denotes a photocoupler, 26 denotes an error amplifier, and 27 denotes a rectifying / smoothing unit connected to the second winding 24 b on the secondary side of the switching transformer 24. Reference numeral 3 denotes a power factor correction / rectification / smoothing circuit connected between the switching power supply units 1 and 2 and the commercial power supply.

ここで、上記構成の装置では、エラーアンプ２６やフォトカプラ２５が何らかの原因で故障した時、フィードバック信号がスイッチング電源部２の制御回路部２２に与えられなくなり、スイッチングトランス２４の第１巻線２４ａ、第２巻線２４ｂ、第３巻線２４ｃの電圧が上昇する。しかし、第３巻線２４ｃは、整流・平滑部２８、ダイオード２９を介してスイッチング電源部２の制御回路部２２のＶｃｃ２２ａに接続されており、その端子電圧も上昇するので、スイッチング電源部２の制御回路部２２のＯＶＰが働き、スイッチング電源部２の出力は、他の回路を破壊することなく停止する。   Here, in the apparatus having the above configuration, when the error amplifier 26 or the photocoupler 25 fails for some reason, the feedback signal is not given to the control circuit unit 22 of the switching power supply unit 2, and the first winding 24 a of the switching transformer 24. The voltages of the second winding 24b and the third winding 24c rise. However, the third winding 24c is connected to the Vcc 22a of the control circuit unit 22 of the switching power supply unit 2 via the rectifying / smoothing unit 28 and the diode 29, and the terminal voltage thereof also rises. The OVP of the control circuit unit 22 works, and the output of the switching power supply unit 2 stops without destroying other circuits.

このようにエラーアンプ２６やフォトカプラ２５が故障して回路が電気的にオープン状態になると、スイッチングトランス２４の第２巻線２４ｂの電圧が上昇するとともに第３巻線２４ｃの電圧も上昇し、整流・平滑部２８、ダイオード２９を介してスイッチング電源部２の制御回路部２２のＶｃｃ端子電圧も上昇するので、スイッチング電源部２の制御回路部２２のＯＶＰ機能が働き、スイッチング電源部２の出力は、安全に他の回路を破壊することなく停止させることができる。   Thus, when the error amplifier 26 and the photocoupler 25 break down and the circuit is electrically opened, the voltage of the second winding 24b of the switching transformer 24 increases and the voltage of the third winding 24c also increases. Since the Vcc terminal voltage of the control circuit unit 22 of the switching power supply unit 2 also rises via the rectifying / smoothing unit 28 and the diode 29, the OVP function of the control circuit unit 22 of the switching power supply unit 2 works and the output of the switching power supply unit 2 Can be safely stopped without destroying other circuits.

本発明によれば、他のスイッチング電源部からスイッチング電源部の制御電圧を供給しているプラズマディスプレイ用電源装置において、フィードバック系の回路がオープン状態になっても、他の回路を破壊することなく安全に出力を止めることができる。   According to the present invention, in the plasma display power supply apparatus that supplies the control voltage of the switching power supply unit from another switching power supply unit, even if the feedback system circuit is in an open state, the other circuit is not destroyed. The output can be safely stopped.

本発明の一実施の形態によるプラズマディスプレイ用電源装置の構成を示す回路図The circuit diagram which shows the structure of the power supply device for plasma displays by one embodiment of this invention 従来のプラズマディスプレイ用電源装置の構成を示す回路図Circuit diagram showing the configuration of a conventional plasma display power supply device

符号の説明Explanation of symbols

１、２ スイッチング電源部
２２ 制御回路部
２４ スイッチングトランス
２４ａ 第１巻線
２４ｂ 第２巻線
２４ｃ 第３巻線 1, 2 Switching power supply unit 22 Control circuit unit 24 Switching transformer 24a First winding 24b Second winding 24c Third winding

Claims (1)

第１のスイッチング電源部と、この第１のスイッチング電源部から制御出力部の過電圧保護回路を有する制御回路部の電源端子に電源電圧が供給される第２のスイッチング電源部と、この第２のスイッチング電源部に設けられ第１巻線及び第２巻線を有するスイッチングトランスとを有し、前記スイッチングトランスの１次側に第３巻線を設け、その第３巻線の出力を前記制御回路部の電源端子に接続したプラズマディスプレイ装置。 A first switching power supply section; a second switching power supply section for supplying a power supply voltage from the first switching power supply section to a power supply terminal of a control circuit section having an overvoltage protection circuit for a control output section; A switching transformer provided in the switching power supply section and having a first winding and a second winding, a third winding is provided on the primary side of the switching transformer, and an output of the third winding is supplied to the control circuit Display device connected to the power terminal of the unit.
JP2003374143A 2003-11-04 2003-11-04 Plasma display device Pending JP2005143155A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259416A (en) * 2007-04-06 2008-10-23 Power Integrations Inc Method and apparatus for sensing fault state of power converter
US8773871B2 (en) 2007-04-06 2014-07-08 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
CN110989442A (en) * 2019-12-09 2020-04-10 西安交通大学 Quick switching system and control method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259416A (en) * 2007-04-06 2008-10-23 Power Integrations Inc Method and apparatus for sensing fault state of power converter
US8755201B2 (en) 2007-04-06 2014-06-17 Power Integrations, Inc. Method and apparatus for power converter fault condition detection
US8773871B2 (en) 2007-04-06 2014-07-08 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
US9071153B2 (en) 2007-04-06 2015-06-30 Power Integrations, Inc. Method and apparatus for power converter fault condition detection
US9166479B2 (en) 2007-04-06 2015-10-20 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
US9543840B2 (en) 2007-04-06 2017-01-10 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
US9912242B2 (en) 2007-04-06 2018-03-06 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
US10177666B2 (en) 2007-04-06 2019-01-08 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
US10432095B2 (en) 2007-04-06 2019-10-01 Power Integrations, Inc. Method and apparatus for sensing multiple voltage values from a single terminal of a power converter controller
CN110989442A (en) * 2019-12-09 2020-04-10 西安交通大学 Quick switching system and control method
CN110989442B (en) * 2019-12-09 2021-04-13 西安交通大学 Control method of rapid switching system

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