JPS6322756B2 - - Google Patents
Info
- Publication number
- JPS6322756B2 JPS6322756B2 JP14390882A JP14390882A JPS6322756B2 JP S6322756 B2 JPS6322756 B2 JP S6322756B2 JP 14390882 A JP14390882 A JP 14390882A JP 14390882 A JP14390882 A JP 14390882A JP S6322756 B2 JPS6322756 B2 JP S6322756B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- flyback transformer
- voltage
- transistor
- secondary winding
- 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.)
- Expired
Links
- 238000004804 winding Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はフライバツクトランスに過電流が流れ
た場合に回路を保護することができるテレビジヨ
ン受像機の保護装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a protection device for a television receiver that can protect a circuit when an overcurrent flows through a flyback transformer.
従来例の構成とその問題点
第１図に従来例における保護装置の回路図を示
す。商用電源１の交流をダイオードD1，D2，D3，
D4で整流し、安定化回路２で定電圧にしている。
この定電圧を過電流検出抵抗R1およびフライバ
ツクトランスT1の低リンギング安定動作用コイ
ルL1と抵抗R4との並列回路を介してフライバツ
クトランスT1の一次巻線の一端に加える。水平
発振回路３の出力は過電圧保護回路４を通り水平
一次ドライブ回路５を通り、トランジスタQ3の
ベースに供給され、増幅される。トランジスタ
Q3の出力は、トランスT2でインピーダンス変換
の後トランジスタQ2のベースに加えられトラン
ジスタQ2のコレクタはフライバツクトランスT1
に加えられる。フライバツクトランスT1の２次
巻線から非充電回路用電源出力をとり出してい
る。Configuration of conventional example and its problems FIG. 1 shows a circuit diagram of a conventional protection device. The AC of the commercial power supply 1 is connected to the diodes D 1 , D 2 , D 3 ,
It is rectified by D4 and made constant voltage by stabilizing circuit 2.
This constant voltage is applied to one end of the primary winding of the flyback transformer T1 via an overcurrent detection resistor R1 , a parallel circuit of the low ringing stable operation coil L1 of the flyback transformer T1 , and a resistor R4 . The output of the horizontal oscillation circuit 3 passes through an overvoltage protection circuit 4, a horizontal primary drive circuit 5, and is supplied to the base of a transistor Q3 , where it is amplified. transistor
The output of Q 3 is applied to the base of transistor Q 2 after impedance conversion by transformer T 2 , and the collector of transistor Q 2 is connected to flyback transformer T 1.
added to. The power output for the non-charging circuit is taken out from the secondary winding of the flyback transformer T1 .
過電流検出抵抗R1の電源側端子にトランジス
タQ1のエミツタが他端子に抵抗を介してトラン
ジスタQ1のベースが接続されている。トランジ
スタQ1のコレクタは抵抗R2とR3との直列回路を
介して接地されている。抵抗R2とR3の交点は過
電圧保護回路の制御端子に接続されている。 The emitter of a transistor Q1 is connected to the power supply side terminal of the overcurrent detection resistor R1 , and the base of the transistor Q1 is connected to the other terminal via a resistor. The collector of transistor Q 1 is grounded through a series circuit of resistors R 2 and R 3 . The intersection of resistors R 2 and R 3 is connected to the control terminal of the overvoltage protection circuit.
回路が正常に動作している時は抵抗R1の両端
に現われる電圧V1ではトランジスタQ1を導通さ
せるだけの電圧が発生せず従つて抵抗R2とR3の
交点はアース電位にあり過電流保護回路４は動作
しない。 When the circuit is operating normally, the voltage V 1 appearing across resistor R 1 does not generate enough voltage to make transistor Q 1 conductive, so the intersection of resistors R 2 and R 3 is at ground potential, causing an overvoltage. Current protection circuit 4 does not operate.
いま何らかの原因でフライバツクトランスT1
に異常電流が流れると抵抗R1の両端電圧V1がト
ランジスタQ1のベース・エミツタ間の動作電圧
を越える。するとトランジスタQ1が導通し、抵
抗R2，R3の交点の電圧が上がり過電圧保護回路
４を動作させ、水平一次ドライブ出力をストツプ
させフライバツクトランスT1の絶縁が破壊され
ることを防止する。 For some reason, the flyback transformer T1
When an abnormal current flows through the transistor, the voltage V1 across the resistor R1 exceeds the operating voltage between the base and emitter of the transistor Q1 . Then, the transistor Q 1 becomes conductive, and the voltage at the intersection of the resistors R 2 and R 3 increases, operating the overvoltage protection circuit 4, stopping the horizontal primary drive output, and preventing the insulation of the flyback transformer T 1 from being destroyed. .
この回路では水平発振回路３、過電圧保護回路
４、水平一次ドライブ回路５も充電回路となつて
いるが、これらの回路を非充電回路内に入れたい
場合がある。 In this circuit, the horizontal oscillation circuit 3, overvoltage protection circuit 4, and horizontal primary drive circuit 5 are also charging circuits, but there are cases where it is desired to include these circuits in a non-charging circuit.
発明の目的
本発明は水平発振回路、過電圧保護回路、水平
ドライブ回路を非充電回路側に入れた場合にでも
採用することができる保護装置を提供しようとす
るものである。OBJECTS OF THE INVENTION The present invention provides a protection device that can be used even when a horizontal oscillation circuit, an overvoltage protection circuit, and a horizontal drive circuit are placed on the non-charging circuit side.
発明の構成
本発明は交流電源電圧を整流平滑して得た直流
電圧を低リンギング安定動作用コイルを介してフ
ライバツクトランスに加え、このコイルに２次巻
線を設け、この２次巻線の出力によつてフライバ
ツクトランスの異常電流を検出し、検出信号によ
つて保護回路を制御するようにしたものである。Structure of the Invention The present invention applies a DC voltage obtained by rectifying and smoothing an AC power supply voltage to a flyback transformer via a low ringing stable operation coil, and a secondary winding is provided to this coil. Abnormal current in the flyback transformer is detected by the output, and the protection circuit is controlled by the detection signal.
実施例の説明
以下本発明の一実施例について図面を参照して
説明する。第２図はその一実施例であり、第１図
と同一部分は同一番号を付して説明を省略する。
第２図の回路の特徴は、第１図における抵抗R1、
トランジスタQ1、抵抗R2，R3による回路を除去
し、代りにコイルL1の２次巻線の出力をダイオ
ードD5で整流し、コンデンサC1で平滑し、得ら
れた直流電圧をツエナーダイオードD6を介して
過電圧保護回路４の制御端子に加えるようにした
点にある。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows one embodiment of the present invention, and the same parts as those in FIG. 1 are given the same numbers and the explanation will be omitted.
The characteristics of the circuit in FIG. 2 are that the resistance R 1 in FIG.
The circuit consisting of transistor Q 1 and resistors R 2 and R 3 is removed, and instead the output of the secondary winding of coil L 1 is rectified by diode D 5 and smoothed by capacitor C 1 , and the resulting DC voltage is converted to Zener. The point is that it is applied to the control terminal of the overvoltage protection circuit 4 via the diode D6 .
通常の正常な動作状態ではコイルL1の２次巻
線にはフライバツクパルスが出るが、その出力電
圧はツエナーダイオードD6を導通させるに充分
な電圧は出て来ない。従つて過電圧保護回路４は
動作しない。次に何らかの事故でフライバツクト
ランスT1に異常電流が流れるとコイルL1の両端
電圧も高くなり当然２次巻線に現われるパルス電
圧も高くなる。このパルス電圧を整流して得られ
た電圧がツエナーダイオードD6の動作電圧を越
えると過電圧保護回路４を動作させ、水平一次ド
ライブ回路５の出力をストツプさせフライバツク
トランスT1の絶縁が破壊されることを防ぐ。 Under normal operating conditions, a flyback pulse is generated in the secondary winding of coil L1 , but its output voltage is not sufficient to cause Zener diode D6 to conduct. Therefore, overvoltage protection circuit 4 does not operate. Next, if an abnormal current flows through the flyback transformer T1 due to some kind of accident, the voltage across the coil L1 will also increase, and naturally the pulse voltage appearing in the secondary winding will also increase. When the voltage obtained by rectifying this pulse voltage exceeds the operating voltage of the Zener diode D6 , the overvoltage protection circuit 4 is activated, the output of the horizontal primary drive circuit 5 is stopped, and the insulation of the flyback transformer T1 is destroyed. prevent
発明の効果
以上のように本発明によれば直流電源回路とフ
ライバツクトランスとの間に設けたコイルに２次
巻線を設け、この２次巻線の出力を検出用の信号
にしているので、水平発振回路、過電圧保護回路
等が非充電回路であつても、保護回路を構成する
ことができるものである。Effects of the Invention As described above, according to the present invention, a secondary winding is provided in the coil provided between the DC power supply circuit and the flyback transformer, and the output of this secondary winding is used as a detection signal. , horizontal oscillation circuit, overvoltage protection circuit, etc., can constitute a protection circuit even if they are non-charging circuits.
第１図は従来例における保護装置の回路図、第
２図は本発明の一実施例における保護装置の回路
図である。
１……商用電源、D1〜D4……ダイオード、２
……安定化回路、３……水平発振回路、４……過
電圧保護回路、５……水平一次ドライブ回路、
T1……フライバツクトランス、L1……コイル、
D5……ダイオード、C1……コンデンサ、D6……
ツエナーダイオード。
FIG. 1 is a circuit diagram of a protection device in a conventional example, and FIG. 2 is a circuit diagram of a protection device in an embodiment of the present invention. 1...Commercial power supply, D1 to D4 ...Diode, 2
... Stabilization circuit, 3 ... Horizontal oscillation circuit, 4 ... Overvoltage protection circuit, 5 ... Horizontal primary drive circuit,
T1 ...Flyback transformer, L1 ...Coil,
D 5 ... Diode, C 1 ... Capacitor, D 6 ...
Zener diode.
Claims (1)
低リンギング安定動作用コイルを介してフライバ
ツクトランスに加え、上記コイルに２次巻線を設
け、この２次巻線の出力によつてフライバツクト
ランスの異常電流を検出し、検出信号によつて保
護回路を制御することを特徴とする保護装置。1 The DC voltage obtained by rectifying and smoothing the AC power supply voltage is applied to the flyback transformer via a low ringing stable operation coil, a secondary winding is provided to the coil, and the output of this secondary winding causes the flyback transformer to A protection device that detects abnormal current in a back transformer and controls a protection circuit using a detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14390882A JPS5933975A (en) | 1982-08-18 | 1982-08-18 | Protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14390882A JPS5933975A (en) | 1982-08-18 | 1982-08-18 | Protecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5933975A JPS5933975A (en) | 1984-02-24 |
| JPS6322756B2 true JPS6322756B2 (en) | 1988-05-13 |
Family
ID=15349873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14390882A Granted JPS5933975A (en) | 1982-08-18 | 1982-08-18 | Protecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5933975A (en) |
-
1982
- 1982-08-18 JP JP14390882A patent/JPS5933975A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5933975A (en) | 1984-02-24 |
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