JPH0239678A - Cathode ray tube driving device - Google Patents
Cathode ray tube driving deviceInfo
- Publication number
- JPH0239678A JPH0239678A JP18839788A JP18839788A JPH0239678A JP H0239678 A JPH0239678 A JP H0239678A JP 18839788 A JP18839788 A JP 18839788A JP 18839788 A JP18839788 A JP 18839788A JP H0239678 A JPH0239678 A JP H0239678A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- discharge
- surge
- high voltage
- 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、陰極線管の管内放電による回路部品の破壊
を防止する機能を有する陰極線管駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cathode ray tube drive device having a function of preventing destruction of circuit components due to internal discharge of a cathode ray tube.
（従来の技術）
第２図は従来の陰極線管駆動装置を示すブロック接続図
であり、図において、１は合成映像信号から水平の同期
信号を取り出す同期分離回路、２はこの同期分離回路１
からの同期信号でトリガされて発振する水平発振回路で
、これには発振周期を安定化するための自動周波数制御
回路（図示しない）が設けられる。３は水平発振回路２
の出力にもとづいてのこぎり波を作り、これを偏向コイ
ルに流すための水平出力回路、４は水平出力回路３のパ
ルス電圧を昇圧、整流して、陰極線管６（以下、ＣＲＴ
という）のアノードに供給する高圧整流回路、５はＣＲ
Ｔ６のアノード、７はこのアノード５と高圧整流回路４
とを結ぶ高圧ケーブル、８はＣＲＴ６のコーティングア
ース９とＣＲＴソケット１０とを結ぶリード線、１１は
電子銃、１２はシャーシグランド回路である。(Prior Art) Fig. 2 is a block connection diagram showing a conventional cathode ray tube drive device.
A horizontal oscillation circuit that oscillates when triggered by a synchronization signal from the oscillator, and is equipped with an automatic frequency control circuit (not shown) to stabilize the oscillation cycle. 3 is horizontal oscillation circuit 2
A horizontal output circuit 4 generates a sawtooth wave based on the output of the horizontal output circuit 3 and sends it to the deflection coil.
5 is a high-voltage rectifier circuit that supplies the anode of
The anode of T6, 7 is this anode 5 and the high voltage rectifier circuit 4
8 is a lead wire that connects the coating ground 9 of the CRT 6 and the CRT socket 10, 11 is an electron gun, and 12 is a chassis ground circuit.
次に動作について説明する。Next, the operation will be explained.
同期分離回路１で合成映像信号から取り出された同期信
号は、水平発振回路２をトリガして、水平発振パルスを
この水平発振回路２から出力させ、この平行発振パルス
にもとづいて、水平出力回路３が例えば１５．７５にＨ
ｚのこぎり波電流を発生する。また、こののこぎり波電
流にもとづいて、高圧整流回路４は例えば２０〜３ＱＫ
Ｖの直流高電圧を作り、これを高圧ケーブル７を介して
アノード５に供給する。The synchronization signal extracted from the composite video signal by the synchronization separation circuit 1 triggers the horizontal oscillation circuit 2 to output a horizontal oscillation pulse from the horizontal oscillation circuit 2. Based on this parallel oscillation pulse, the horizontal output circuit 3 outputs a horizontal oscillation pulse. For example, H to 15.75
Generates a z-sawtooth current. Also, based on this sawtooth wave current, the high voltage rectifier circuit 4 has a voltage of 20 to 3 QK, for example.
A DC high voltage of V is generated and supplied to the anode 5 via the high voltage cable 7.
ところで、上記ＣＲＴ６には、これのコーテイング面お
よびガラスを誘電体として、図示のような分布窓］ｔＣ
を生じ、この分布容量Ｃによる電流が、電子銃１１．Ｃ
ＲＴソケット１０、リード線８およびコーティングアー
ス９を通って放電する。また、この放電電流の一部はシ
ャーシに流れ込む。いま、上記リード線８が持つインダ
クタンスをＬとすると、放電電流ｉによりリード線８に
生じる電圧は、■＝−Ｌ−ｄｉ／ｄｔとなる。そして、
この電圧はサージの原因となり、内部に使用されている
各回路の半導体部品を破壊する原因となっている。By the way, the above-mentioned CRT 6 has a distribution window]tC as shown in the figure, using the coating surface and the glass as a dielectric.
The current due to this distributed capacitance C flows through the electron gun 11. C
Discharge through RT socket 10, lead wire 8 and coating ground 9. Also, a part of this discharge current flows into the chassis. Now, assuming that the inductance of the lead wire 8 is L, the voltage generated in the lead wire 8 due to the discharge current i is 2=-L-di/dt. and,
This voltage causes surges and destroys the semiconductor components of each circuit used inside.
一方、かかる管内放電に対しては、今日では上記放電電
流を抑制したり、半導体部品のサージ耐、量を上げる方
法が広く実用されている。On the other hand, to deal with such intra-tube discharge, methods are now widely used to suppress the discharge current and increase the surge resistance and capacity of semiconductor components.
（発明が解決しようとする［Ｊり
従来の陰極線管駆動装置は以上のように構成されている
ので、上記放電電流の抑制や半導体部品のサージ耐量の
上限設定にも拘わらず、瞬時に不規則に生じる過大電力
を受けることによりて、その半導体部品のサージ破壊が
しばしば発生するなどの問題点があった。(The problem that the invention seeks to solve) Since the conventional cathode ray tube drive device is configured as described above, despite the above-mentioned suppression of the discharge current and the upper limit setting of the surge resistance of semiconductor components, There has been a problem in that semiconductor components often suffer from surge damage due to excessive power generated by the semiconductor devices.
この発明は上記のような問題点を解消するためになされ
たもので、ＣＲＴの管内放電を検出して、直流高圧を瞬
時制御することにより、回路の半導体部品を過大電力か
ら守ることができる陰極線管駆動装置を得ることを目的
とする。This invention was made to solve the above-mentioned problems, and it is a cathode ray that can protect the semiconductor components of the circuit from excessive power by detecting the discharge inside the CRT tube and instantaneously controlling the DC high voltage. The purpose is to obtain a tube drive device.
（課題を解決するための手段）
この発明に係る陰極線管駆動装置は、高圧整流回路とア
ノードとを結ぶ高圧ケーブルに放電検出器を設け、この
放電検出器の出力にもとづいて、高圧整流回路の出力を
制御するような構成としたものである。(Means for Solving the Problems) A cathode ray tube drive device according to the present invention is provided with a discharge detector in a high voltage cable connecting a high voltage rectifier circuit and an anode, and based on the output of this discharge detector, the cathode ray tube drive device according to the present invention The configuration is such that the output is controlled.
（作用）
この発明における手伝検出器は、ＣＲＴの管内放電を高
圧ケーブル上において検出し、この検出出力にもとづい
て高圧整流回路の出力電圧を瞬時に低下させることによ
り、上記管内放電およびこれによって生じるサージ電流
を消滅させ、上記管内放電にもとづく、各回路上の半導
体部品への過大な電力負担を軽減し、これを保護するよ
うに作用する。(Function) The help detector of the present invention detects the intra-tube discharge of the CRT on the high-voltage cable, and instantaneously lowers the output voltage of the high-voltage rectifier circuit based on this detection output. The generated surge current is extinguished, and the excessive power load on the semiconductor components on each circuit due to the above-mentioned intraluminal discharge is reduced and acts to protect them.
（発明の実施例）
以下に、この発明の一実施例を図について説明する。第
１図において、２１は高圧ケーブル７上に設けたサージ
検出器としての放電検出器であり、これが鉄心２２と、
これに巻装したコイル２３とからなる。また、この放電
検出器２１は水平発振回路２の制御入力端子に接続され
、水平発振回路２の動作を制御して、結果的に高圧整流
回路４の出力電圧のレベルを瞬時に低下させるように制
御する。なお、このほかの第２図に示したものと同一の
構成部分には同一符号を付して、その重複する説明を省
略する。(Embodiment of the Invention) An embodiment of the invention will be described below with reference to the drawings. In FIG. 1, 21 is a discharge detector as a surge detector provided on the high voltage cable 7, and this is connected to the iron core 22,
It consists of a coil 23 wound around this. Further, this discharge detector 21 is connected to the control input terminal of the horizontal oscillation circuit 2, and controls the operation of the horizontal oscillation circuit 2, so that the level of the output voltage of the high voltage rectifier circuit 4 is instantaneously reduced. Control. Note that other components that are the same as those shown in FIG. 2 are designated by the same reference numerals, and redundant explanation thereof will be omitted.
次に動作について説明する。Next, the operation will be explained.
いま、ＣＲＴ６の駆動中において、このＣＲＴのコーテ
イング面とガラスを′ｆＪＪ電体として生じる分布容量
の一部が上記のように管内放電した後リード線８に流れ
、これによってこのリード線８に誘起されたサージ電圧
は各回路内に侵入し、上記高圧整流回路４の出力電圧に
重畳されて、アノードに出力される。このとき、放電検
出器２１はその重畳されたサージ電圧を、話導結合にて
電圧検出し、これを水平発振回路２の制御入力端子に入
力する。このため、水平発振回路２はこの入力した電圧
の大きさに応じて発振パルスのレベルを低下させ、ある
いは瞬時停止させたりする。この結果、のこぎり波から
直流高圧を作り出す高圧整流回路４の出力もまた一時的
に低下して、上記の管内放電が消滅せしめられる。かく
して、この管内放電にもとづくサージ電圧による半導体
部品の破壊を、これのサージ耐量を上げることな（、確
実に防止でざることになる。Now, while the CRT 6 is being driven, a part of the distributed capacitance generated on the coated surface of the CRT and the glass as a 'fJJ electric body discharges in the tube as described above and flows into the lead wire 8, thereby causing an induced voltage in the lead wire 8. The generated surge voltage enters each circuit, is superimposed on the output voltage of the high voltage rectifier circuit 4, and is output to the anode. At this time, the discharge detector 21 detects the superimposed surge voltage using conductive coupling, and inputs this to the control input terminal of the horizontal oscillation circuit 2. Therefore, the horizontal oscillation circuit 2 lowers the level of the oscillation pulse or instantaneously stops the oscillation pulse depending on the magnitude of the input voltage. As a result, the output of the high-voltage rectifier circuit 4, which generates DC high voltage from the sawtooth wave, also temporarily decreases, causing the above-mentioned intratubular discharge to disappear. In this way, destruction of semiconductor components due to surge voltages caused by this intratube discharge can be prevented without increasing the surge resistance of the semiconductor components.
（発明の効果〕
以上のように、この発明によれば高圧整流回路とＣＲＴ
のアノードとを結ぶ高圧ケーブルにサージ検出器として
の放電検出器を設け、この放電検出器の出力にもとづい
て、上記高圧整流回路の出力をコントロールするように
構成したので、ＣＲＴの管内放電にもとづくサージ電流
によって、各回路の半導体部品が破壊するのを確実に防
止でき、しかもかかる利点を簡単かつ安価な構成にて実
現できるものが得られる効果がある。(Effects of the Invention) As described above, according to the present invention, a high voltage rectifier circuit and a CRT
A discharge detector as a surge detector is installed on the high voltage cable connecting the anode of the CRT, and the output of the high voltage rectifier circuit is controlled based on the output of this discharge detector. It is possible to reliably prevent the semiconductor components of each circuit from being destroyed by surge current, and there is an effect that such advantages can be realized with a simple and inexpensive configuration.
第１図はこの発明の一実施例による陰極線管駆動装置を
示すブロック接続図、第２図は従来の陰極線管駆動装置
を示すブロック接続図である。
２は水平発振回路、４は高圧整流回路、５はアノード、
６は陰極線管（ＣＲＴ）、７は高圧ケーブル、２１は放
電検出器。
なお、図中、同一符号は同一、又は相当部分を示す。FIG. 1 is a block connection diagram showing a cathode ray tube drive device according to an embodiment of the present invention, and FIG. 2 is a block connection diagram showing a conventional cathode ray tube drive device. 2 is a horizontal oscillation circuit, 4 is a high voltage rectifier circuit, 5 is an anode,
6 is a cathode ray tube (CRT), 7 is a high voltage cable, and 21 is a discharge detector. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
回路と、この水平発振回路の駆動パルスにもとづいて直
流高電圧を作る高圧整流回路と、この高圧整流回路から
の直流高電圧を陰極線管のアノードに供給する高圧ケー
ブルとを備えた陰極線管駆動装置において、上記ケーブ
ルに、管内放電にもとづく放電電流を検出して、上記高
圧整流回路の出力を制御する放電検出器を設けたことを
特徴とする陰極線管駆動装置。A horizontal oscillation circuit that outputs a drive pulse synchronized with a horizontal synchronization signal, a high-voltage rectifier circuit that generates a high DC voltage based on the drive pulse of this horizontal oscillation circuit, and a high-voltage rectifier circuit that supplies the high DC voltage from the high-voltage rectifier circuit to the anode of the cathode ray tube. A cathode ray tube drive device comprising a high-voltage cable for supplying a high-voltage cable to the tube, characterized in that the cable is provided with a discharge detector that detects a discharge current based on discharge within the tube and controls the output of the high-voltage rectifier circuit. Cathode ray tube drive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18839788A JPH0239678A (en) | 1988-07-29 | 1988-07-29 | Cathode ray tube driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18839788A JPH0239678A (en) | 1988-07-29 | 1988-07-29 | Cathode ray tube driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0239678A true JPH0239678A (en) | 1990-02-08 |
Family
ID=16222927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18839788A Pending JPH0239678A (en) | 1988-07-29 | 1988-07-29 | Cathode ray tube driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0239678A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6707437B1 (en) | 1998-05-01 | 2004-03-16 | Canon Kabushiki Kaisha | Image display apparatus and control method thereof |
-
1988
- 1988-07-29 JP JP18839788A patent/JPH0239678A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6707437B1 (en) | 1998-05-01 | 2004-03-16 | Canon Kabushiki Kaisha | Image display apparatus and control method thereof |
| US7180514B2 (en) | 1998-05-01 | 2007-02-20 | Canon Kabushiki Kaisha | Image display apparatus and control method thereof |
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