JPH0473832B2 - - Google Patents
Info
- Publication number
- JPH0473832B2 JPH0473832B2 JP3969285A JP3969285A JPH0473832B2 JP H0473832 B2 JPH0473832 B2 JP H0473832B2 JP 3969285 A JP3969285 A JP 3969285A JP 3969285 A JP3969285 A JP 3969285A JP H0473832 B2 JPH0473832 B2 JP H0473832B2
- Authority
- JP
- Japan
- Prior art keywords
- horizontal
- circuit
- deflection
- coil
- additional
- 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
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000010355 oscillation Effects 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 5
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
- H04N3/27—Circuits special to multi-standard receivers
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〕
この発明は、水平発振周波数が切り換え可能な
水平偏向回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a horizontal deflection circuit whose horizontal oscillation frequency can be switched.
RGB入力端子付きのテレビジヨン受像機は、
RGB信号（原色映像信号）を供給するパーソナ
ルコンピユータからの水平同期信号の周波数が、
テレビジヨン信号と同じ15.75kHzであれば、問題
なくパーソナルコンピユータに接続することがで
きるが、パーソナルコンピユータの方は、機種に
よつては、モニタ出力に付随する水平同期信号の
周波数を、24.8kHzに設定したものがあり、高解
像度タイプのものほど、水平同期信号として周波
数が高いものが用いられる傾向がある。
Television receivers with RGB input terminals are
The frequency of the horizontal synchronization signal from the personal computer that supplies the RGB signal (primary color video signal) is
If it is 15.75kHz, which is the same as the television signal, it can be connected to a personal computer without any problem, but depending on the model of personal computer, the frequency of the horizontal synchronization signal accompanying the monitor output may be set to 24.8kHz. There are certain settings, and the higher the resolution type, the higher the frequency tends to be used as the horizontal synchronization signal.
第３図に示す従来の水平偏向回路１は、高解像
度のパーソナルコンピユータから送られてくる
24.8kHzの水平同期信号にも対応できるよう、水
平出力回路２内の共振コンデンサＣと水平偏向コ
イルＬにそれぞれ、スイツチSa，Sbにより閉路さ
れるコンデンサC1とコイルL1を並列接続し、ス
イツチSa，Sbの切り換えにより回路定数を変更
し、水平出力を変更するよう構成したものであ
る。すなわち、水平発振回路３に接続された水平
駆動回路４の出力である水平駆動パルスによりオ
ン・オフを繰り返す水平出力トランジスタＱのコ
レクタには、ダンパダイオードＤ、共振コンデン
サＣ、コンデンサC1、Ｓ字補正用のコンデンサ
Csと水平偏向コイルＬとコイルL1の並列接続回
路が接続してあり、フライバツクトランス５の１
次側コイルを介して電源Vccからの電流が供給さ
れる。 The conventional horizontal deflection circuit 1 shown in FIG. 3 is transmitted from a high-resolution personal computer.
In order to support the horizontal synchronization signal of 24.8kHz, a capacitor C1 and a coil L1 , which are closed by switches S a and S b , are connected in parallel to the resonant capacitor C and horizontal deflection coil L in the horizontal output circuit 2 , respectively. , the circuit constants are changed by switching switches S a and S b , and the horizontal output is changed. That is, a damper diode D, a resonant capacitor C, a capacitor C 1 , and an S-shaped transistor are connected to the collector of the horizontal output transistor Q, which is repeatedly turned on and off by the horizontal drive pulse that is the output of the horizontal drive circuit 4 connected to the horizontal oscillation circuit 3 . correction capacitor
A parallel connection circuit of C s , horizontal deflection coil L, and coil L 1 is connected, and flyback transformer 5 1
Current from the power supply Vcc is supplied via the next coil.
上記従来の水平偏向回路１は、スイツチSa，Sb
の切り換えにより水平発振周波数を変化させたと
きに、水平偏向コイルＬを流れる偏向電流波形に
ついて、水平走査期間と水平帰線期間の比が変ら
ないように回路定数を設定すると、偏向電力が十
分得られないことがあり、電源電圧の変動ととも
に水平偏向が乱れることがある等の問題点があつ
た。
The above conventional horizontal deflection circuit 1 has switches S a and S b
If the circuit constants are set so that the ratio of the horizontal scanning period to the horizontal retrace period does not change for the deflection current waveform flowing through the horizontal deflection coil L when the horizontal oscillation frequency is changed by switching, sufficient deflection power can be obtained. However, there were problems such as the horizontal deflection being disturbed due to fluctuations in the power supply voltage.
〔問題点を解決するための手段〕
この発明は、上記問題点を解決したものであ
り、水平発振周波数でオン・オフ駆動される水平
出力トランジスタに、ダンパダイオード、共振コ
ンデンサ、水平偏向コイルが並列的に接続された
水平出力回路を有する水平偏向回路であつて、前
記共振コンデンサに直列接続した付加コンデンサ
と、前記水平偏向コイルに直列接続した付加コイ
ルと、この付加コイルと前記付加コンデンサのい
ずれか一方を選択的に短絡し、水平出力を可変す
る制御回路とを設けて構成したことを要旨とする
ものである。[Means for Solving the Problems] This invention solves the above problems, and includes a damper diode, a resonant capacitor, and a horizontal deflection coil in parallel with a horizontal output transistor that is turned on and off at a horizontal oscillation frequency. a horizontal deflection circuit having a horizontal output circuit connected to the resonant capacitor, an additional capacitor connected in series to the resonant capacitor, an additional coil connected in series to the horizontal deflection coil, and either the additional coil or the additional capacitor. The gist of the present invention is to provide a control circuit that selectively short-circuits one side and varies the horizontal output.
この発明は、水平出力回路内の共振コンデンサ
と水平偏向コイルにそれぞれ直列接続した付加コ
ンデンサと付加コイルのうち、一方を選択的に短
絡することにより、水平発振周波数の変化に対応
しつつ、偏向電力不変でかつ水平走査期間と水平
帰線期間の比が不変である偏向電流波形を得る。
This invention is capable of responding to changes in the horizontal oscillation frequency by selectively shorting one of the additional capacitors and additional coils connected in series to the resonant capacitor and horizontal deflection coil in the horizontal output circuit. A deflection current waveform is obtained in which the ratio of the horizontal scanning period to the horizontal retrace period remains unchanged.
以下、この発明の実施例について、図面を参照
して説明する。第１，２図は、それぞれこの発明
の水平偏向回路の一実施例を示す回路構成図及び
回路各部の信号波形図である。
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a circuit configuration diagram and a signal waveform diagram of each part of the circuit, respectively, showing an embodiment of the horizontal deflection circuit of the present invention.
第１図中、水平偏向回路１１は、水平発振周波
数がf1（＝15.75kHz）とf2（＝24.8kHz）の２種類の
周波数に切り換えることができる水平発振回路１
３と、水平発振回路１３の出力を増幅する水平駆
動回路１４、水平偏向コイルＬに偏向電流を供給
する水平出力回路１２及び水平発振回路１３と水
平出力回路１２に接続され、これらを制御する制
御回路１５とから構成される。 In FIG. 1, the horizontal deflection circuit 11 is a horizontal oscillation circuit 1 whose horizontal oscillation frequency can be switched between two frequencies: f 1 (=15.75kHz) and f 2 (=24.8kHz).
3, a horizontal drive circuit 14 that amplifies the output of the horizontal oscillation circuit 13, a horizontal output circuit 12 that supplies a deflection current to the horizontal deflection coil L, and a control that is connected to the horizontal oscillation circuit 13 and the horizontal output circuit 12 and controls them. It is composed of a circuit 15.
水平出力回路１２は、共振コンデンサＣに直列
接続した付加コンデンサC11と水平偏向コイルＬ
に直列接続した付加コイルL11を有しており、こ
れらの付加コンデンサC11と付加コイルL11は、そ
れぞれ並列接続したスイツチＳ，を閉成するこ
とにより、短絡することができる。制御回路１５
は、水平発振回路１３の水平発振周波数をf1又は
f2に切り換えるとともに、上記２個のスイツチＳ
は又はのうちの一方を選択的に閉成する。従つ
て、スイツチＳとは、互いに逆動作で開閉成す
るようになつており、制御回路１５とスイツチ
の間には、制御回路１５の出力を極性反転する反
転回路１６が設けてある。 The horizontal output circuit 12 includes an additional capacitor C 11 connected in series with a resonant capacitor C and a horizontal deflection coil L.
The additional capacitor C 11 and the additional coil L 11 can be short-circuited by closing the switches S, which are connected in parallel. Control circuit 15
is the horizontal oscillation frequency of the horizontal oscillation circuit 13 f 1 or
At the same time as switching to f 2 , the above two switches S
selectively closes one of the or. Therefore, the switch S is designed to open and close in reverse operation to each other, and an inversion circuit 16 for inverting the polarity of the output of the control circuit 15 is provided between the control circuit 15 and the switch.
この実施例では、制御回路１５が水平発振周波
数をf1に設定した場合、スイツチＳが閉成し、ス
イツチが開成する。また、制御回路１５が水平
発振周波数をf2に設定した場合、スイツチＳが開
成し、スイツチが閉成する。 In this embodiment, when the control circuit 15 sets the horizontal oscillation frequency to f1 , the switch S is closed and the switch is opened. Further, when the control circuit 15 sets the horizontal oscillation frequency to f2 , the switch S is opened and the switch S is closed.
ここで、共振コンデンサＣと付加コンデンサ
C11の容量をCa，Cb、水平偏向コイルＬと付加コ
イルL11のインダクタンスをLa，Lbとし、さらに
水平発振周波数がf1，f2での動作を区別するた
め、水平走査期間Ts、水平帰線期間Tr、偏向電
流Ipに、それぞれf1，f2に対応して、添字１、２
を付して表わすと、
Ts1＝２（La＋Lb）／VccIp1、
Tr1＝π√（a＋b）a
なる関係式が成立する。 Here, the resonant capacitor C and the additional capacitor
The capacitance of C 11 is C a , C b , the inductance of horizontal deflection coil L and additional coil L 11 is L a , L b , and in order to distinguish between operations at horizontal oscillation frequencies f 1 and f 2 , horizontal scanning Subscripts 1 and 2 are given to the period T s , the horizontal retrace period T r , and the deflection current I p , corresponding to f 1 and f 2 , respectively.
T s1 = 2 (L a + L b )/V cc I p1 , T r1 = π√ ( a + b ) a The following relational expression holds true.
そして、水平走査期間Tsと、水平帰線期間Tr
の比を変えず、しかも水平偏向コイルＬで消費さ
れる水平偏向電力も不変であるという条件。 Then, the horizontal scanning period T s and the horizontal retrace period T r
The condition is that the ratio of 1 and 2 does not change, and that the horizontal deflection power consumed by the horizontal deflection coil L also remains unchanged.
Ts1／Ts2＝Tr1／Tr2＝f2／f1＝
ｋ、１／２LaIp1 2＝１／２LaIp2 2
が成立するための関係式を求めると、Ip1＝Ip2で
あるから、
Cb＝１／ｋ−１Ca、Lb＝（ｋ−１）La
が得られる。T s1 /T s2 =T r1 /T r2 =f 2 /f 1 = k, 1/2L a I p1 2 = 1/2L a I p2 If we find the relational expression for 2 to hold, I p1 = I Since p2 , C b =1/k-1C a and L b =(k-1)L a are obtained.
このように、付加コンデンサC11の容量Cb及び
付加コイルL11のインダクタンスLbは、それぞれ
CaとLa及び水平発振周波数f1とf2の比ｋにのみ依
存し、従つて比ｋがあらかじめ判つていれば、簡
単に回路定数の設定が可能であり、しかも偏向電
力不変で、かつ水平走査期間と水平帰線期間の比
が不変の偏向電流波形を得ることができる。 In this way, the capacitance C b of the additional capacitor C 11 and the inductance L b of the additional coil L 11 are respectively
It depends only on the ratio k between C a and L a and horizontal oscillation frequencies f 1 and f 2. Therefore, if the ratio k is known in advance, it is possible to easily set the circuit constants, and the deflection power remains unchanged. , and a deflection current waveform in which the ratio of the horizontal scanning period to the horizontal retrace period remains unchanged can be obtained.
このように、上記水平偏向回路１１は、水平出
力回路１２内の共振コンデンサＣと水平偏向コイ
ルＬに対し、それぞれ付加コンデンサC11と付加
コイルL11を直列接続により付加し、これらの付
加コンデンサC11及び付加コイルL11の一方を選択
的に短絡することにより、水平発振周波数の変化
に対応させて、水平出力を可変する構成としたか
ら水平走査期間Tsと、水平帰線期間Trの比を一
定に保つたまま、偏向電流波形の周波数を可変す
ることができ、しかも水平偏向コイルＬで消費さ
れる偏向電力を一定に保つこともできるから、水
平発振周波数によらず十分な偏向電力を得ること
ができ、電源電圧の変動により水平偏向が乱れる
等の不都合を防止することができる。 In this way, the horizontal deflection circuit 11 has an additional capacitor C 11 and an additional coil L 11 connected in series to the resonant capacitor C and the horizontal deflection coil L in the horizontal output circuit 12, respectively. 11 and one of the additional coils L11 is selectively short-circuited to vary the horizontal output in response to changes in the horizontal oscillation frequency . The frequency of the deflection current waveform can be varied while keeping the ratio constant, and the deflection power consumed by the horizontal deflection coil L can also be kept constant, so sufficient deflection power can be obtained regardless of the horizontal oscillation frequency. This makes it possible to prevent inconveniences such as disturbances in horizontal deflection due to fluctuations in power supply voltage.
以上説明したように、この発明によれば、水平
出力回路内の共振コンデンサと水平偏向コイルに
対し、それぞれ付加コンデンサと付加コイルを直
列接続により付加し、これらの付加コンデンサ及
び付加コイルの一方を選択的に短絡することによ
り、水平発振周波数の変化を対応させて、水平出
力を可変する構成としたから、水平走査期間と水
平帰線期間の比を一定に保つたまま、偏向電流波
形の周波数を可変することができ、しかも水平偏
向コイルで消費される偏向電力を一定に保つこと
もできるから、水平発振周波数によらず十分な偏
向電力を得ることができ、電源電圧の変動により
水平偏向が乱れる等の不都合を防止することがで
きる等の優れた効果を奏する。
As explained above, according to the present invention, additional capacitors and additional coils are added in series to the resonant capacitor and horizontal deflection coil in the horizontal output circuit, respectively, and one of these additional capacitors and additional coils is selected. By short-circuiting the Since it is possible to vary the deflection power and also to keep the deflection power consumed by the horizontal deflection coil constant, it is possible to obtain sufficient deflection power regardless of the horizontal oscillation frequency, and the horizontal deflection is not disturbed by fluctuations in the power supply voltage. This has excellent effects such as being able to prevent such inconveniences.
第１，２図は、それぞれこの発明の水平偏向回
路の一実施例を示す回路構成図及び回路各部の信
号波形図、第３図は、従来の水平偏向回路の一例
を示す回路構成図である。
１１…水平偏向回路、１２…水平出力回路、１
３…水平発振回路、１４…水平駆動回路、１５…
制御回路、Ｑ…水平出力トランジスタ、Ｃ…共振
コンデンサ、Ｌ…水平偏向コイル、C11…付加コ
ンデンサ、L11…付加コイル、Ｓ，…スイツチ。
1 and 2 are a circuit configuration diagram and a signal waveform diagram of each part of the circuit, respectively, showing an embodiment of the horizontal deflection circuit of the present invention, and FIG. 3 is a circuit configuration diagram showing an example of a conventional horizontal deflection circuit. . 11...Horizontal deflection circuit, 12...Horizontal output circuit, 1
3...Horizontal oscillation circuit, 14...Horizontal drive circuit, 15...
Control circuit, Q...horizontal output transistor, C...resonant capacitor, L...horizontal deflection coil, C11 ...additional capacitor, L11 ...additional coil, S,...switch.
Claims (1)
出力トランジスタに、ダンパダイオード、共振コ
ンデンサ、水平偏向コイルが並列的に接続された
水平出力回路を有する水平偏向回路であつて、前
記共振コンデンサに直列接続した付加コンデンサ
と、前記水平偏向コイルに直列接続した付加コイ
ルと、この付加コイルと前記付加コンデンサのい
ずれか一方を選択的に短絡し、水平出力を可変す
る制御回路とを設けてなる水平偏向回路。1 A horizontal deflection circuit having a horizontal output circuit in which a damper diode, a resonant capacitor, and a horizontal deflection coil are connected in parallel to a horizontal output transistor that is driven on and off at a horizontal oscillation frequency, and the horizontal output circuit is connected in series to the resonant capacitor. an additional capacitor connected in series to the horizontal deflection coil; and a control circuit that selectively shorts either the additional coil or the additional capacitor to vary the horizontal output. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3969285A JPS61199381A (en) | 1985-02-28 | 1985-02-28 | Horizontal deflecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3969285A JPS61199381A (en) | 1985-02-28 | 1985-02-28 | Horizontal deflecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61199381A JPS61199381A (en) | 1986-09-03 |
| JPH0473832B2 true JPH0473832B2 (en) | 1992-11-24 |
Family
ID=12560090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3969285A Granted JPS61199381A (en) | 1985-02-28 | 1985-02-28 | Horizontal deflecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61199381A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294971A (en) * | 1985-06-19 | 1986-12-25 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Line output circuit |
| JPS6356865U (en) * | 1986-09-30 | 1988-04-15 | ||
| JPS63164762A (en) * | 1986-12-26 | 1988-07-08 | Mitsubishi Electric Corp | Circuit for switching resonance capacitor |
| GB2214016A (en) * | 1987-12-18 | 1989-08-23 | Philips Electronic Associated | Variable flyback period |
-
1985
- 1985-02-28 JP JP3969285A patent/JPS61199381A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61199381A (en) | 1986-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |