CN1052759A - 带调谐输出变压器的放大器 - Google Patents
带调谐输出变压器的放大器 Download PDFInfo
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- CN1052759A CN1052759A CN90110149A CN90110149A CN1052759A CN 1052759 A CN1052759 A CN 1052759A CN 90110149 A CN90110149 A CN 90110149A CN 90110149 A CN90110149 A CN 90110149A CN 1052759 A CN1052759 A CN 1052759A
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- Prior art keywords
- amplifier
- error
- transformer
- gull wing
- damping
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- 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
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Details Of Television Scanning (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Saccharide Compounds (AREA)
- Processing Of Color Television Signals (AREA)
- Television Receiver Circuits (AREA)
- Carbon And Carbon Compounds (AREA)
- Earth Drilling (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Transmitters (AREA)
Abstract
带调谐输出变压器的放大器用以校正彩色电视
中的鸥翅误差。校正电流在每条线的周期里由两个
余弦振荡组成。校正鸥翅误差以后存留一个静正误
差,称为弯曲误差。它表现为线条的端部向图象中心
弯曲。放大器的负反馈在线条周期的开始和终端处
比在线条周期的中心处减小,因此,用以消除鸥翅误
差的校正电流幅值在中心处减小。这一设计特别适
用于有超平面显象管的彩色电视。
Description
本发明为一个带调谐输出变压器的放大器。
在显象管上,特别是在大尺寸显象管上的扫描区域内会出现一些几何图形失真。例如在大尺寸直角显象管上出现一个南一北方向上的几何图形失真,它对水平中线呈抛物线形,使线条下垂。这一误差在图形的上缘和下缘为最大,向图形中心连续降低。
另一种几何图形误差为水平线条的弯曲,在一条线周期内出现二个余弦振荡,因此称为“鸥翅误差”。特别是在显象管的上半部和下半部出现同样的误差。这一误差可以用一个由调制电路产生的二倍线条频率校正电流予以校正。校正后存留一个误差,称为弯曲误差。这种误差造成图象左缘和右缘线条朝图象中心弯曲,在图象的上半部线条朝上弯曲,在图象的下半部朝下弯曲。这种弯曲误差与鸥翅误差出现在同一区域内。在以前的申请(P38,14,563.4)中叙述了用以校正弯曲误差的一种电路,其中也加进一些整机电路的改进。
本发明的目的在于用更为简单的方法消除弯曲误差。
以下将用图示为例来说明本发明。
图1示出放大器对大尺寸显象管上典型的几何图形误差所起的作用;
图2示出本发明的线路图;
图3示出图2中所标点上的信号波形。
图1表示出本发明所述的方法如何在校正几何图形误差上起作用。图1a为鸥翅误差被校正以后出现的弯曲误差,在A区和C区可以看到写出线条尾部向上弯曲部分。如果用放大鸥翅校正来校正这个误差,在B区内会出现过补偿(图1b)。采取措施减弱B区内的过补偿,阻尼鸥翅校正电流,在B区内的写出线条可重新变成线性(图1C)。因而,本发明的目的在于采用适当方法避免在B区内的过补偿。在南-北方向校正电路中采用了调谐变压器以节省功率,并且平衡在左侧和在右侧的几何校正。当幅值出现非常快的变化并且必须传输时,调谐输出电路会产生问题,而这正是要消除弯曲误差时的情况。在一条线周期64μs内,鸥翅校正电流必须在由A区到B区时迅速地转换为一个较小的值,此后,在C区内必须达到起始值。这是用鸥翅校正电路输入信号的相应调制是不可能达到的。这是由于振荡电路的Q因数,由于储能的原因振荡幅值衰减得相对地慢。
下面将用图2并结合图3,用一个改进的鸥翅校正电路的例子来说明本发明。
图2的电路中,首先是一个已知的消除鸥翅误差的校正电路。对于反馈放大器电路的输入E1,通过耦合电容C1,把校正信号加在输入三极管T1上。输入三极管通过由电阻R1和R2组成的分压器,在工作电压源-UB1和地之间改换偏置电压以调节放大器的工作点。输入三极管T1的射极联到反馈电路R6和R3中的基本电阻R3上,R3与地电位相连。T1的集电极由工作电阻R4与工作电压-UB1连接。信号通过电阻R5到达功率三极管T2的输入,T2的射极接在工作电压源-UB1上,而集电极则通过谐振变压器TR的初级线圈与地相连。从TR的次级线圈上可以得到输出的校正信号。功率三极管T2的集电极通过反馈电路R6和R3中的电阻R6连至输入三极管的射极。这是一个已知的反馈电路。谐振变压器TR借助于电容C2调谐,例如调至二倍线条频率2fz=f。这一电路将由本发明提出的下列元件来补充。一个开关三极管T3,其射极与地电位相连,它在正确的时间切换通过耦合电容C3与基本电阻R3并联的电阻R7。耦合电容C3对于交流电流的信号是短路的,其作用只是阻隔工作电压-UB2。电压-UB2通过电阻R8供电给开关三极管的集电极。现在,通过开关三极管T3的时间适当控制,切换与前述放大器的反馈耦合,使校正电流在B区(图1)内减小。增大反馈耦合意味着放大器的内电阻减小,因此,由变压器TR的线圈与电容C2组成的振荡回路变为较大的阻尼。为此,附加电路的输入E2通过耦合电容C4提供一个线条频率的脉冲H(图3a),该脉冲又通过电阻R9和电容C5转换为锯齿形的信号(图3b)。电阻R10和二极管D2组成箝位电路与积分元件R9/C5连接并影响控制脉冲的宽度(图3C)。该脉冲通过电阻R11与开关三极管T3连接。二极管D1通过对基极-射极电压的限幅作用保护三极管T3。开关三极管T3的控制必须能通过切换同一不导电使反馈耦合在B区内增加。由于功率三极管T2的感性负载,开关三极管T3的控制电压必须相对于校正电流移相90°,在反馈耦合增加的时间内有效的校正电流减弱。在给出的例子中,反馈耦合是由切除电阻R7得到的。反馈耦合也可由切换射极电阻R3的串联电阻而得到增加。
在图3d中示出此电路对校正电流的影响。
为解决本发明目的的电路参数按下表给出:
R1:470KΩ C1:10nF D1:1N4148
R2:22KΩ C2:0.1μF D2:1N4148
R3:680Ω C3:1μF
R4:2.2KΩ C4:10nF T1:BC557
R5:1KΩ C5:1nF T2:BD137
R6:6.8KΩ T3:BC557
R7:330Ω
R8:15KΩ
R9:47KΩ
R10:47KΩ UB1:-25V
R11.47KΩ UB2:-15V
Claims (6)
1、用以传输在一个周期内至少有二次振荡的信号带调谐变压器的放大器,其特征在于提供了一个阻尼装置,它在时间段(B)中输出信号的幅值相对该周期内其它时间段(A,C)降低。
2、根据权利要求1的放大器其特征在于通过增大阻尼来降低幅值,通过降低阻尼来增大幅值。
3、根据权利要求1或2的放大器其特征在于用一个电子开关(T3)来切除阻尼。
4、根据权利要求1,2或3的放大器其特征在于阻尼受到切除放大器反馈的影响。
5、根据权利要求3或4的放大器其特征在于电子开关(T3)切除放大器反馈耦合电路(R6,R3)中的基本电阻(R3)。
6、根据权利要求5的放大器其特征在于电子开关(T3)切除放大器反馈耦合电路(R6,R3)中的输入电阻(R6)。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3942908.3 | 1989-12-23 | ||
DEP3942908.3 | 1989-12-23 | ||
DE3942908A DE3942908A1 (de) | 1989-12-23 | 1989-12-23 | Verstaerker mit einem abgestimmten ausgangsuebertrager |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1052759A true CN1052759A (zh) | 1991-07-03 |
CN1021689C CN1021689C (zh) | 1993-07-21 |
Family
ID=6396404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN90110149A Expired - Fee Related CN1021689C (zh) | 1989-12-23 | 1990-12-22 | 带调谐输出变压器的放大器 |
Country Status (14)
Country | Link |
---|---|
US (1) | US5299009A (zh) |
EP (1) | EP0506724B1 (zh) |
JP (1) | JP3272352B2 (zh) |
CN (1) | CN1021689C (zh) |
AT (1) | ATE137901T1 (zh) |
AU (1) | AU6917191A (zh) |
DE (2) | DE3942908A1 (zh) |
ES (1) | ES2088481T3 (zh) |
FI (1) | FI107105B (zh) |
HK (1) | HK72997A (zh) |
HU (1) | HUT63526A (zh) |
TR (1) | TR24857A (zh) |
WO (1) | WO1991010319A1 (zh) |
ZA (1) | ZA9010345B (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1044203C (zh) * | 1991-11-14 | 1999-07-21 | 侯锦朝 | 卧式条状物涂装机 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES8608735A1 (es) * | 1984-06-12 | 1986-06-16 | Rca Corp | Perfeccionamientos introducidos en un aparato de visualiza- cion de un tubo de imagen |
US4682085A (en) * | 1984-06-12 | 1987-07-21 | Rca Corporation | Gullwing distortion corrected deflection circuitry for a square-planar picture tube |
US4642530A (en) * | 1985-05-10 | 1987-02-10 | Rca Corporation | Raster distortion correction circuit |
US4625154A (en) * | 1985-07-30 | 1986-11-25 | Rca Corporation | Deflection circuit with a switched mode modulator circuit |
FI86127C (fi) * | 1987-03-23 | 1992-07-10 | Rca Licensing Corp | Korrigeringskrets foer maosvingedistorsion. |
DE3814563A1 (de) * | 1988-04-29 | 1989-11-09 | Thomson Brandt Gmbh | Verfahren zur korrektur von geometrieverzerrungen auf dem bildschirm einer kathodenstrahlroehre |
JPH043663A (ja) * | 1990-04-20 | 1992-01-08 | Fujitsu General Ltd | 偏向ひずみ補正回路 |
-
1989
- 1989-12-23 DE DE3942908A patent/DE3942908A1/de not_active Withdrawn
-
1990
- 1990-12-11 JP JP50122891A patent/JP3272352B2/ja not_active Expired - Fee Related
- 1990-12-11 AU AU69171/91A patent/AU6917191A/en not_active Abandoned
- 1990-12-11 EP EP91900803A patent/EP0506724B1/de not_active Expired - Lifetime
- 1990-12-11 WO PCT/EP1990/002144 patent/WO1991010319A1/de active IP Right Grant
- 1990-12-11 HU HU922042A patent/HUT63526A/hu unknown
- 1990-12-11 AT AT91900803T patent/ATE137901T1/de not_active IP Right Cessation
- 1990-12-11 ES ES91900803T patent/ES2088481T3/es not_active Expired - Lifetime
- 1990-12-11 DE DE59010321T patent/DE59010321D1/de not_active Expired - Fee Related
- 1990-12-21 ZA ZA9010345A patent/ZA9010345B/xx unknown
- 1990-12-21 TR TR90/1212A patent/TR24857A/xx unknown
- 1990-12-22 CN CN90110149A patent/CN1021689C/zh not_active Expired - Fee Related
-
1992
- 1992-06-22 FI FI922901A patent/FI107105B/fi not_active IP Right Cessation
- 1992-07-17 US US07/914,726 patent/US5299009A/en not_active Expired - Lifetime
-
1997
- 1997-05-29 HK HK72997A patent/HK72997A/xx not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1044203C (zh) * | 1991-11-14 | 1999-07-21 | 侯锦朝 | 卧式条状物涂装机 |
Also Published As
Publication number | Publication date |
---|---|
ATE137901T1 (de) | 1996-05-15 |
JP3272352B2 (ja) | 2002-04-08 |
HUT63526A (en) | 1993-08-30 |
DE59010321D1 (de) | 1996-06-13 |
HK72997A (en) | 1997-06-06 |
TR24857A (tr) | 1992-07-01 |
ES2088481T3 (es) | 1996-08-16 |
HU9202042D0 (en) | 1992-10-28 |
US5299009A (en) | 1994-03-29 |
FI922901A0 (fi) | 1992-06-22 |
FI107105B (fi) | 2001-05-31 |
CN1021689C (zh) | 1993-07-21 |
JPH05502985A (ja) | 1993-05-20 |
FI922901A (fi) | 1992-06-22 |
EP0506724B1 (de) | 1996-05-08 |
ZA9010345B (en) | 1991-10-30 |
AU6917191A (en) | 1991-07-24 |
EP0506724A1 (de) | 1992-10-07 |
WO1991010319A1 (de) | 1991-07-11 |
DE3942908A1 (de) | 1991-06-27 |
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