JPH0195868U - - Google Patents
Info
- Publication number
- JPH0195868U JPH0195868U JP19216487U JP19216487U JPH0195868U JP H0195868 U JPH0195868 U JP H0195868U JP 19216487 U JP19216487 U JP 19216487U JP 19216487 U JP19216487 U JP 19216487U JP H0195868 U JPH0195868 U JP H0195868U
- Authority
- JP
- Japan
- Prior art keywords
- high voltage
- circuit
- horizontal
- resistor
- set value
- 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
- 238000004804 winding Methods 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Details Of Television Scanning (AREA)
Description
第１図は本考案の過電流保護回路の第１の実施
例を示す図、第２図は本考案の過電流保護回路の
第２の実施例を示す図、第３図は従来例の過電流
保護回路を示す図である。
１……水平発振回路、２……電源端子、３……
水平偏向出力回路、４……フライバツクトランス
、４ａ……１次巻線、４ｂ……２次巻線、４ｃ…
…３次巻線、５……高圧整流ブロツク、６……ブ
ラウン管、７……映像増幅回路、８……ＡＢＬ回
路、Ｃ１〜Ｃ３……コンデンサ、Ｄ１〜Ｄ４……
ダイオード、Ｄ５，Ｄ６……ツエナーダイオード
、Ｑ１〜Ｑ３……ＮＰＮトランジスタ、Ｒ１，Ｒ
２，Ｒ４，Ｒ５Ａ，Ｒ５Ｂ，Ｒ６……抵抗、Ｒ３
……可変抵抗、ＶＡ，ＶＢ……電圧源、ＶＣ……
基準電圧源、ｉＡ……アノード電流。
Fig. 1 shows a first embodiment of the overcurrent protection circuit of the present invention, Fig. 2 shows a second embodiment of the overcurrent protection circuit of the invention, and Fig. 3 shows a conventional overcurrent protection circuit. FIG. 3 is a diagram showing a current protection circuit. 1... Horizontal oscillation circuit, 2... Power supply terminal, 3...
Horizontal deflection output circuit, 4...Flyback transformer, 4a...Primary winding, 4b...Secondary winding, 4c...
...Tertiary winding, 5...High voltage rectifier block, 6...Cathode ray tube, 7...Video amplification circuit, 8...ABL circuit, C1 to C3 ...Capacitor, D1 to D4 ...
Diode, D 5 , D 6 ... Zener diode, Q 1 to Q 3 ... NPN transistor, R 1 , R
2 , R 4 , R 5 A, R 5 B, R 6 ...Resistance, R 3
...Variable resistance, VA, VB...Voltage source, VC...
Reference voltage source, iA...anode current.
Claims (1)
作を行う水平偏向出力回路と、 前記水平偏向出力回路で発生するパルス電圧が
その１次巻線に供給され、この２次巻線に昇圧さ
れたパルス電圧を得るフライバツクトランスと、 前記フライバツクトランスの２次巻線の高圧側
端子に接続され、前記昇圧されたパルス電圧を整
流して得た高圧をブラウン管のアノードに供給す
る高圧整流ブロツクと、 前記フライバツクトランスの２次側巻線の低圧
側端子と基準電圧源の間に直列に接続された第１
及び第２の抵抗と、 前記フライバツクトランスの２次巻線の低圧側
端子と前記第１の抵抗の接続点より高圧電流を検
出し、前記高圧電流が第１の設定値を超えた場合
映像信号をブラウン管へ供給する映像増幅回路の
出力映像信号レベルを制御することによりアノー
ド電流の増加を抑えるＡＢＬ回路と、 前記第１の抵抗と前記第２の抵抗の接続点より
高圧電流を検出し、前記高圧電流が第２の設定値
を超えた場合前記水平発振回路の動作を停止させ
る水平発振停止回路とを有して構成したことを特
徴とする高圧過電流保護回路。 (2) 第２の設定値を第１の設定値の略２乃至３
倍に設定した実用新案登録請求の範囲第１項記載
の高圧過電流保護回路。[Claims for Utility Model Registration] (1) A horizontal oscillation circuit that oscillates at a horizontal frequency, a horizontal deflection output circuit that performs a horizontal deflection operation based on an output signal of the horizontal oscillation circuit, and a pulse voltage generated by the horizontal deflection output circuit. is supplied to its primary winding and obtains a boosted pulse voltage to its secondary winding; a high voltage rectifier block that supplies high voltage obtained by rectifying the voltage to the anode of the cathode ray tube; and a first block connected in series between the low voltage side terminal of the secondary winding of the flyback transformer and the reference voltage source.
and a second resistor, a high voltage current is detected from a connection point between the low voltage side terminal of the secondary winding of the flyback transformer and the first resistor, and when the high voltage current exceeds the first set value, an image is generated. an ABL circuit that suppresses an increase in anode current by controlling the output video signal level of a video amplification circuit that supplies a signal to a cathode ray tube; and detecting a high voltage current from a connection point between the first resistor and the second resistor; A high voltage overcurrent protection circuit comprising: a horizontal oscillation stop circuit that stops the operation of the horizontal oscillation circuit when the high voltage current exceeds a second set value. (2) Set the second set value to approximately 2 to 3 times the first set value.
A high voltage overcurrent protection circuit as set forth in claim 1 of the utility model registration set to double.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19216487U JPH0195868U (en) | 1987-12-17 | 1987-12-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19216487U JPH0195868U (en) | 1987-12-17 | 1987-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0195868U true JPH0195868U (en) | 1989-06-26 |
Family
ID=31483037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19216487U Pending JPH0195868U (en) | 1987-12-17 | 1987-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0195868U (en) |
-
1987
- 1987-12-17 JP JP19216487U patent/JPH0195868U/ja active Pending
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