JPH0221973U - - Google Patents
Info
- Publication number
- JPH0221973U JPH0221973U JP9843488U JP9843488U JPH0221973U JP H0221973 U JPH0221973 U JP H0221973U JP 9843488 U JP9843488 U JP 9843488U JP 9843488 U JP9843488 U JP 9843488U JP H0221973 U JPH0221973 U JP H0221973U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- picture tube
- video
- signal
- 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
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Details Of Television Scanning (AREA)
Description
第１図は本考案に係るプロジエクシヨン受像機
の過電流防止回路の一実施例を示す回路図である
。
１……入力端子、２……映像増幅回路、３……
Ｒ受像管ドライブ回路、４……Ｇ受像管ドライブ
回路、５……Ｂ受像管ドライブ回路、６……Ｒ受
像管、７……Ｇ受像管、８……Ｂ受像管、９……
フライバツクトランス、１０……電源端子、１１
……水平出力回路、１２……ＡＣＬ回路、１３…
…ＡＢＬ回路、１４……コントラスト調整回路、
１５……輝度調整回路、１６……スイツチ回路、
１７……高圧低下検出回路、Ｒ３〜Ｒ５……分割
抵抗。
FIG. 1 is a circuit diagram showing an embodiment of an overcurrent prevention circuit for a projection receiver according to the present invention. 1...Input terminal, 2...Video amplification circuit, 3...
R picture tube drive circuit, 4...G picture tube drive circuit, 5...B picture tube drive circuit, 6...R picture tube, 7...G picture tube, 8...B picture tube, 9...
Flyback transformer, 10...Power terminal, 11
...Horizontal output circuit, 12...ACL circuit, 13...
...ABL circuit, 14...Contrast adjustment circuit,
15...Brightness adjustment circuit, 16...Switch circuit,
17...High voltage drop detection circuit, R3-R5...Division resistor.
Claims (1)
しＹ―Ｃ分離して色差信号及び輝度信号を出力す
る映像増幅回路と、 この映像増幅回路からの色差信号及び輝度信号
を導入し、Ｒ受像管、Ｇ受像管及びＢ受像管を夫
々ドライブして映像信号を映出させるドライブ回
路と、 前記Ｒ受像管、Ｇ受像管及びＢ受像管のアノー
ドに高圧を供給する高圧発生回路と、 前記高圧を分圧する分割抵抗と、 この分割抵抗により分圧した電圧を基準電圧と
比較して比較結果に基づく制御信号を出力する高
圧低下検出回路と、 前記高圧発生回路の高圧が基準電圧よりも低下
したことが前記制御信号により示された場合には
前記増幅回路に供給する直流電圧を設定値に固定
して映像信号の振幅レベル及び直流レベルを制限
する映像信号制御回路とを具備したことを特徴と
するプロジエクシヨン受像機の過電流防止回路。[Claims for Utility Model Registration] A video amplification circuit that amplifies a video signal detected by video detection using an amplification circuit, separates Y and C and outputs a color difference signal and a luminance signal, and a color difference signal and a brightness signal from the video amplification circuit. A drive circuit that drives the R picture tube, G picture tube, and B picture tube to display video signals; and a high voltage that supplies high voltage to the anodes of the R picture tube, G picture tube, and B picture tube. a generation circuit; a dividing resistor that divides the high voltage; a high voltage drop detection circuit that compares the voltage divided by the dividing resistor with a reference voltage and outputs a control signal based on the comparison result; a video signal control circuit that limits the amplitude level and the DC level of the video signal by fixing the DC voltage supplied to the amplifier circuit to a set value when the control signal indicates that the voltage has decreased below a reference voltage; An overcurrent prevention circuit for a projection receiver, characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9843488U JPH0221973U (en) | 1988-07-27 | 1988-07-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9843488U JPH0221973U (en) | 1988-07-27 | 1988-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0221973U true JPH0221973U (en) | 1990-02-14 |
Family
ID=31324694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9843488U Pending JPH0221973U (en) | 1988-07-27 | 1988-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0221973U (en) |
-
1988
- 1988-07-27 JP JP9843488U patent/JPH0221973U/ja active Pending
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