JPH0326593B2 - - Google Patents
Info
- Publication number
- JPH0326593B2 JPH0326593B2 JP58073731A JP7373183A JPH0326593B2 JP H0326593 B2 JPH0326593 B2 JP H0326593B2 JP 58073731 A JP58073731 A JP 58073731A JP 7373183 A JP7373183 A JP 7373183A JP H0326593 B2 JPH0326593 B2 JP H0326593B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- horizontal deflection
- secondary winding
- flyback transformer
- 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 - Lifetime
Links
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
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
- H04N3/185—Maintaining DC voltage constant
-
- 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
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Description
本発明はテレビジヨン受像機における高圧安定
化回路に関する。
従来、水平偏向ヨークを駆動する第１の水平偏
向回路と高圧安定化のための補正パルスを発生す
る第２の水平偏向回路とを有する高圧安定化回路
がある。この高圧安定化回路は第１に示す如く、
トランジスタ３、ダンパーダイオード４、共振コ
ンデンサ５、水平偏向ヨーク６に直列接続した直
流阻止コンデンサ７からなり、フライバツク変圧
器１４の１次巻線に水平帰線パルスを供給する第
１の水平偏向回路１と、トランジスタ９、ダンパ
ーダイオード１０、共振コンデンサ１１、ダミー
ヨーク１２、ダミーヨーク１２に直列接続した直
流阻止コンデンサ１３からなり、フライバツク変
圧器１４の２次巻線の低圧側に接続した第２の水
平偏向回路２と、フライバツク変圧の２次巻線出
力電圧を検出するブリーダ抵抗２３と、１次巻線
１５に供給する直流供給電源１９の電圧をブリー
ダ抵抗２３の出力により制御して第２の水平偏向
回路２の電源電圧として供給する電源電圧制御回
路２０とからなつていた。
なお、１７はフライバツク変圧器１４の３次巻
線である。
上記の如く構成した従来の高圧安定化回路に水
平ドライブパルス１８を供給すると、第１の水平
偏向回路１は偏向ヨーク６を駆動すると同時に水
平帰線期間に共振コンデンサ５と偏向ヨーク６と
により共振したフライバツクパルス電圧vP1を１
次巻線１５を介して２次巻線１６に発生し、ブラ
ウン管のアノード電圧を生成せしめる。この場合
に第１の水平偏向回路１には直流供給電源１９か
ら一定の直流電圧が供給されているため、フライ
バツクパルス電圧vP1の変化はなく、２次巻線１
６の出力電圧の変化はない。
また第２の水平偏向回路２は水平ドライブパル
ス１８により駆動され、水平帰線期間に共振コン
デンサ１１とダミーヨーク１２により共振したフ
ライバツクパルス電圧vP2を発生し、このフライ
バツクパルス電圧vP2は２次巻線１６の低圧側に
供給される。のフライバツクパルス電圧vP2は
The present invention relates to high voltage stabilization circuits in television receivers. Conventionally, there is a high voltage stabilizing circuit that includes a first horizontal deflection circuit that drives a horizontal deflection yoke and a second horizontal deflection circuit that generates a correction pulse for stabilizing the high voltage. As shown in the first diagram, this high voltage stabilizing circuit is
A first horizontal deflection circuit 1 includes a transistor 3, a damper diode 4, a resonant capacitor 5, and a DC blocking capacitor 7 connected in series with a horizontal deflection yoke 6, and supplies a horizontal retrace pulse to the primary winding of a flyback transformer 14. , a transistor 9, a damper diode 10, a resonant capacitor 11, a dummy yoke 12, a DC blocking capacitor 13 connected in series with the dummy yoke 12, and a second horizontal transformer connected to the low voltage side of the secondary winding of the flyback transformer 14. The deflection circuit 2, the bleeder resistor 23 that detects the secondary winding output voltage of the flyback transformer, and the voltage of the DC power supply 19 supplied to the primary winding 15 are controlled by the output of the bleeder resistor 23, and the second horizontal It consisted of a power supply voltage control circuit 20 that supplies the power supply voltage to the deflection circuit 2. Note that 17 is the tertiary winding of the flyback transformer 14. When the horizontal drive pulse 18 is supplied to the conventional high voltage stabilizing circuit configured as described above, the first horizontal deflection circuit 1 drives the deflection yoke 6 and at the same time resonates with the resonance capacitor 5 and the deflection yoke 6 during the horizontal retrace period. The flyback pulse voltage v P1 is 1
The voltage is generated in the secondary winding 16 via the primary winding 15 and generates the anode voltage of the cathode ray tube. In this case, since a constant DC voltage is supplied to the first horizontal deflection circuit 1 from the DC supply power source 19, there is no change in the flyback pulse voltage v P1 , and the secondary winding 1
There is no change in the output voltage of No. 6. Further, the second horizontal deflection circuit 2 is driven by the horizontal drive pulse 18, and generates a flyback pulse voltage v P2 that resonates with the resonant capacitor 11 and the dummy yoke 12 during the horizontal retrace period, and this flyback pulse voltage v P2 is It is supplied to the low voltage side of the secondary winding 16. The flyback pulse voltage v P2 is
【式】で表わさ
れる。Vccは制御回路２０を介して供給される電
圧を、LDはダミーヨーク１２のインダクタンス
を、Cr2は共振コンデンサ１１の容量を、tHは水
平偏向期間（63.5μs）を示している。したがつて
Vccを変化することによりフライバツクパルス電
圧VP2を変化できる。
いまブラウン管（図示せず）の輝度が上昇し、
２次巻線１６の負荷電流が増加すると２次巻線１
６の出力電圧２１は低下する。２次巻線１６の出
力電圧２１の低下はブリーダ抵抗２３により検出
され、制御回路２０は第２水平偏向回路２へ供給
する直流電圧を増加せしめる。したがつて２次巻
線１６に供給されるフライバツクパルスVP2の電
圧は２次巻線１６の出力電圧２１の低下分だけ増
加して、２次巻線１６の出力電圧２１の低下分は
補償される。また逆に、２次巻線１６の出力電圧
２１が増加するとこの増加はブリーダ抵抗２３に
よつて検出され、制御回路２０は第２水平偏向回
路２へ供給する直流電圧を低下せしめる。したが
つて２次巻線１６に供給されるフライバツクパル
ス電圧VP2の電圧は２次巻線１６の出力電圧２１
の増加分は補償されて、２次巻線１６の出力電圧
２１は一定に保たれて、高圧電圧が安定化され
る。
しかるに上記した如き従来の高圧安定化回路に
よるときは、このままの状態ではフライバツク変
圧器の２次側から数μA〜数ｍＡの自動輝度リミ
ツタ（以下ABLと記す）用の電流信号を検出す
ることができない欠点があつた。
本発明は上記にかんがみなされたもので、上記
の欠点を解消して自動輝度リミツタ用の電流信号
を検出することができる高圧安定化回路を提供す
ることを目的とする。
以下、本発明を実施例により説明する。
第２図は本発明の一実施例回路図である。本発
明の一実施例において第１図に示した従来の回路
と同一構成要素には同一の符号を付して示してあ
る。
本発明の一実施例においては、第１図に示した
従来の高圧安定化回路に、さらにフライバツク変
圧器１４の２次巻線低圧側に逆流阻止用ダイオー
ドを介して接続した積分コンデンサ２７と、直流
電圧源１９の出力端と積分コンデンサ２７との間
に接続したABL用電流検出抵抗２８とからなる
ABL用電流検出回路２６を接続してある。
一方、第２水平偏向回路２からの出力は結合コ
ンデンサ２４を介して２次巻線１６の低圧側に供
給してある。
以上の如く構成した本実施例において、前記の
第１図に示したと同様に、第２の水平偏向回路２
からフライバツクパルス電圧vP2が出力され、こ
のフライバツクパルス電圧vP2は結合コンデンサ
２４を介して２次巻線１６の低圧側に印加され、
２次巻線１６の出力電圧２１を一定に維持する。
これは第１図に示した従来の高圧安定化回路の場
合と同様である。しかるに結合コンデンサ２４を
介してフライバツクパルス電圧vP2の印加による
フライバツク変圧器１４の他の巻線に影響を与え
ることなしに、２次巻線１６の出力電圧２１を安
定化することができる。また２次巻線１６の出力
電圧２１が安定化されることによりブラウン管の
アノード電圧が安定化されることは勿論である。
一方、フライバツク変圧器１６のアノード電流
の変化はフライバツク変圧器１４の１次電流の変
化として現われ、この１次電流の変化は抵抗２８
により検出される。また抵抗２８には逆流阻止用
のダイオード２５が接続されているため、フライ
バツクパルス電圧vP2によつて影響を受けること
がなくABL用の電流変化が検出される。すなわ
ち、アノード電流が増加すると抵抗２８の電圧降
下は増加し、ABL用電流検出端子２９の電圧は
低下し、アノード電流が減少すると抵抗２８のビ
デオ信号回路のコントラスト調整回路、フライト
ネス調整回路の制御回路に接続され、ABL動作
が行なわる。
なお、以上説明した実施例において積分コンデ
ンサ２７を接続し、ABLの動作を平均値ABLと
した場合を例示したが積分コンデンサ２７を削除
し、ピークABLとしてもよい。
また上記実施例においてABL用電流検出のた
めの抵抗２８を直流供給電源１９に接続した場合
を例示したが、第３図の如く別に電源を用いても
よい。また、第２の水平偏向回路２に第１の水平
偏向回路１に供給する水平ドライブパルス１８を
供給した場合を例示たが水平ドライブパルス１８
に同期したパルスを第２の水平偏向回路２に供給
するようにしてもよい。また、ブリーダ抵抗２３
に代つてABL用電流を検出して制御回路２０を
駆動し、制御回路２０の出力で第２の偏向回路２
へ供給する直流電圧を制御してもよく、また直流
電圧の制御に代つて共振コンデンサ１１またはダ
ミーヨーク１２に直列に、例えば可飽和リアクタ
を挿入してこれを制御してもよく、またさらに第
２の水平偏向回路２へ供給する水平ドライブパル
スのデユーテイ比を制御するようにしてもよい。
本発明は上記したように、フライバツク変圧器
の２次巻線低圧側にダイオードを介して自動輝度
リミツタ用電流を検出するための抵抗を接続した
ことにより、第１、第２水平偏向回路を有するも
のにおいても自動輝度リミツタ用の微小電流を検
出することができ、また、フライバツク変圧器の
２次巻線低圧側に結合コンデンサを介して高圧安
定化用補正パルスを供給しているので、フライバ
ツク変圧器の他の巻線に影響を与えずに高圧を安
定化（ブラウン管に供給するアノード電圧を安定
化）することができる等の効果を有するものであ
る。It is represented by [Formula]. Vcc is the voltage supplied via the control circuit 20, L D is the inductance of the dummy yoke 12, Cr 2 is the capacitance of the resonant capacitor 11, and t H is the horizontal deflection period (63.5 μs). Therefore
By changing Vcc, the flyback pulse voltage V P2 can be changed. Now the brightness of the cathode ray tube (not shown) has increased,
When the load current of the secondary winding 16 increases, the secondary winding 1
6's output voltage 21 decreases. A decrease in the output voltage 21 of the secondary winding 16 is detected by the bleeder resistor 23, and the control circuit 20 increases the DC voltage supplied to the second horizontal deflection circuit 2. Therefore, the voltage of the flyback pulse V P2 supplied to the secondary winding 16 increases by the amount of the decrease in the output voltage 21 of the secondary winding 16, and the decrease in the output voltage 21 of the secondary winding 16 becomes be compensated. Conversely, when the output voltage 21 of the secondary winding 16 increases, this increase is detected by the bleeder resistor 23, and the control circuit 20 reduces the DC voltage supplied to the second horizontal deflection circuit 2. Therefore, the voltage of the flyback pulse voltage V P2 supplied to the secondary winding 16 is equal to the output voltage 21 of the secondary winding 16.
is compensated for, the output voltage 21 of the secondary winding 16 is kept constant, and the high voltage is stabilized. However, when using the conventional high-voltage stabilizing circuit as described above, it is not possible to detect a current signal of several μA to several mA for the automatic brightness limiter (hereinafter referred to as ABL) from the secondary side of the flyback transformer. There was a drawback that I couldn't do it. The present invention has been made in view of the above, and it is an object of the present invention to provide a high-voltage stabilizing circuit capable of eliminating the above-mentioned drawbacks and detecting a current signal for an automatic brightness limiter. The present invention will be explained below using examples. FIG. 2 is a circuit diagram of one embodiment of the present invention. In one embodiment of the present invention, the same components as those in the conventional circuit shown in FIG. 1 are designated by the same reference numerals. In one embodiment of the present invention, in addition to the conventional high voltage stabilizing circuit shown in FIG. Consists of an ABL current detection resistor 28 connected between the output end of the DC voltage source 19 and an integrating capacitor 27
A current detection circuit 26 for ABL is connected. On the other hand, the output from the second horizontal deflection circuit 2 is supplied to the low voltage side of the secondary winding 16 via a coupling capacitor 24. In this embodiment configured as described above, the second horizontal deflection circuit 2
A flyback pulse voltage v P2 is output from , and this flyback pulse voltage v P2 is applied to the low voltage side of the secondary winding 16 via the coupling capacitor 24.
The output voltage 21 of the secondary winding 16 is maintained constant.
This is similar to the case of the conventional high voltage stabilizing circuit shown in FIG. However, by applying the flyback pulse voltage v P2 via the coupling capacitor 24, the output voltage 21 of the secondary winding 16 can be stabilized without affecting other windings of the flyback transformer 14. Furthermore, by stabilizing the output voltage 21 of the secondary winding 16, it goes without saying that the anode voltage of the cathode ray tube is stabilized. On the other hand, a change in the anode current of the flyback transformer 16 appears as a change in the primary current of the flyback transformer 14, and this change in primary current is caused by a change in the anode current of the flyback transformer 14.
Detected by Further, since the diode 25 for blocking reverse current is connected to the resistor 28, the change in the ABL current can be detected without being affected by the flyback pulse voltage v P2 . That is, when the anode current increases, the voltage drop across the resistor 28 increases, the voltage at the ABL current detection terminal 29 decreases, and when the anode current decreases, the contrast adjustment circuit and flightness adjustment circuit of the video signal circuit of the resistor 28 are controlled. Connected to the circuit and performs ABL operation. In the embodiment described above, the case where the integrating capacitor 27 is connected and the ABL operation is set to the average value ABL is exemplified, but the integrating capacitor 27 may be omitted and the peak ABL may be set. Further, in the above embodiment, the resistor 28 for ABL current detection is connected to the DC power supply 19, but a separate power supply may be used as shown in FIG. In addition, although the horizontal drive pulse 18 supplied to the first horizontal deflection circuit 1 is supplied to the second horizontal deflection circuit 2 as an example, the horizontal drive pulse 18
It is also possible to supply pulses synchronized with the second horizontal deflection circuit 2 to the second horizontal deflection circuit 2. In addition, the bleeder resistor 23
Instead, the ABL current is detected to drive the control circuit 20, and the output of the control circuit 20 is used to drive the second deflection circuit 2.
Alternatively, instead of controlling the DC voltage, for example, a saturable reactor may be inserted in series with the resonant capacitor 11 or the dummy yoke 12 to control this. The duty ratio of the horizontal drive pulses supplied to the second horizontal deflection circuit 2 may be controlled. As described above, the present invention has first and second horizontal deflection circuits by connecting a resistor for detecting the automatic brightness limiter current to the low voltage side of the secondary winding of the flyback transformer via a diode. It is possible to detect minute currents for automatic brightness limiters even in the case of automatic brightness limiters, and since a correction pulse for high voltage stabilization is supplied to the low voltage side of the secondary winding of the flyback transformer via a coupling capacitor, the flyback transformer This has the effect of stabilizing the high voltage (stabilizing the anode voltage supplied to the cathode ray tube) without affecting other windings of the device.
第１図は従来の高圧安定化回路の回路図、第２
図は本発明の一実施例の回路図、第３図は他の実
施例の説明図である。
１および２……第１のおよび第２の水平偏向回
路、４および１０……ダンパダイオード、５およ
び１１……共振用のコンデンサ、６……水平偏向
ヨーク、１２……ダミーヨーク、１４……フライ
バツク変圧器、２０……制御回路、２３……ブリ
ーダ抵抗、２５……ダイオード、２６……ABL
用電流検出回路。
Figure 1 is a circuit diagram of a conventional high voltage stabilization circuit, Figure 2 is a circuit diagram of a conventional high voltage stabilization circuit.
The figure is a circuit diagram of one embodiment of the present invention, and FIG. 3 is an explanatory diagram of another embodiment. 1 and 2...first and second horizontal deflection circuits, 4 and 10...damper diodes, 5 and 11...capacitors for resonance, 6...horizontal deflection yoke, 12...dummy yoke, 14... Flyback transformer, 20...control circuit, 23...bleeder resistor, 25...diode, 26...ABL
Current detection circuit for use.
Claims (1)
ークを駆動する水平帰線パルスを供給する第１の
水平偏向回路と、フライバツク変圧器の２次巻線
の低圧側端子に結合コンデンサを介して高圧安定
化のための補正パルスを供給する第２の水平偏向
回路と、フライバツク変圧器の２次巻線の出力電
圧に対応した値に第２の水平偏向回路の直流電源
電圧を制御する制御手段と、フライバツク変圧器
の２次巻線の低圧側端子にダイオードを介して接
続されフライバツク変圧器の２次側電流の変化を
検出する自動輝度リミツタ用電流検出回路とを具
備したことを特徴とする高圧安定化回路。1 A first horizontal deflection circuit that supplies a horizontal retrace pulse that drives the horizontal deflection yoke to the primary winding of the flyback transformer, and a high voltage a second horizontal deflection circuit that supplies a correction pulse for stabilization; and a control means that controls the DC power supply voltage of the second horizontal deflection circuit to a value corresponding to the output voltage of the secondary winding of the flyback transformer. , a high voltage device comprising: a current detection circuit for an automatic brightness limiter connected to a low voltage side terminal of a secondary winding of a flyback transformer via a diode to detect a change in the secondary side current of the flyback transformer; Stabilization circuit.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58073731A JPS59200582A (en) | 1983-04-28 | 1983-04-28 | High voltage stabilizing circuit |
| KR1019840000852A KR870000552B1 (en) | 1983-04-28 | 1984-02-22 | High pressure stabilization circuit |
| GB08410307A GB2141883B (en) | 1983-04-22 | 1984-04-19 | A high voltage generating circuit |
| US06/602,643 US4728868A (en) | 1983-04-22 | 1984-04-20 | High voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58073731A JPS59200582A (en) | 1983-04-28 | 1983-04-28 | High voltage stabilizing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59200582A JPS59200582A (en) | 1984-11-13 |
| JPH0326593B2 true JPH0326593B2 (en) | 1991-04-11 |
Family
ID=13526668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58073731A Granted JPS59200582A (en) | 1983-04-22 | 1983-04-28 | High voltage stabilizing circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59200582A (en) |
| KR (1) | KR870000552B1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464417A (en) * | 1977-10-31 | 1979-05-24 | Sony Corp | Generation circuit for high voltage |
| JPS5753769U (en) * | 1980-09-16 | 1982-03-29 | ||
| JPS57113579U (en) * | 1980-12-29 | 1982-07-14 | ||
| JPS5850559U (en) * | 1981-09-30 | 1983-04-05 | 株式会社日立製作所 | Television receiver overload prevention circuit |
-
1983
- 1983-04-28 JP JP58073731A patent/JPS59200582A/en active Granted
-
1984
- 1984-02-22 KR KR1019840000852A patent/KR870000552B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| KR840008559A (en) | 1984-12-15 |
| KR870000552B1 (en) | 1987-03-18 |
| JPS59200582A (en) | 1984-11-13 |
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