JPH0748807B2 - Horizontal deflection circuit - Google Patents
Horizontal deflection circuitInfo
- Publication number
- JPH0748807B2 JPH0748807B2 JP2132839A JP13283990A JPH0748807B2 JP H0748807 B2 JPH0748807 B2 JP H0748807B2 JP 2132839 A JP2132839 A JP 2132839A JP 13283990 A JP13283990 A JP 13283990A JP H0748807 B2 JPH0748807 B2 JP H0748807B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- horizontal
- voltage
- output
- frequency
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は水平周波数が変った場合でもその周波数を検
出して自動的に水平出力回路の電源電圧をコントロール
し水平振幅補正を行うようにした水平偏向回路に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is designed to detect a horizontal frequency even when the horizontal frequency changes and automatically control the power supply voltage of the horizontal output circuit to perform horizontal amplitude correction. The present invention relates to a horizontal deflection circuit.
第５図は例えば実開昭60−9374号公報に示された従来の
水平偏向回路を示す構成図であり、図において、１は水
平同期信号H.SYNCでトリガされ水平周波数を電圧に変換
する周波数−電圧変換回路、２は周波数−電圧変換回路
１の出力電圧を基準電圧とした誤差増幅器、３は誤差増
幅器２の出力が加えられる電圧安定化回路、3a,3bは電
圧安定化回路３の出力を誤差増幅器２に負帰還させる抵
抗、４は水平出力回路であり、水平偏向コイル６、Ｓ字
補正コンデンサ７、共振用コンデンサ８、ダンパダイオ
ード９及び水平出力トランジスタ10等により公知のよう
に構成されている。５は電圧安定化回路３と水平出力回
路４との間に接続されたチョークコイルである。FIG. 5 is a block diagram showing a conventional horizontal deflection circuit disclosed in, for example, Japanese Utility Model Laid-Open No. 60-9374, in which 1 is triggered by a horizontal synchronizing signal H.SYNC to convert the horizontal frequency into a voltage. A frequency-voltage conversion circuit, 2 is an error amplifier using the output voltage of the frequency-voltage conversion circuit 1 as a reference voltage, 3 is a voltage stabilization circuit to which the output of the error amplifier 2 is added, and 3a and 3b are voltage stabilization circuits 3. A resistor 4 for negatively feeding back the output to the error amplifier 2 is a horizontal output circuit, which is configured in a known manner by a horizontal deflection coil 6, an S-shaped correction capacitor 7, a resonance capacitor 8, a damper diode 9 and a horizontal output transistor 10. Has been done. Reference numeral 5 is a choke coil connected between the voltage stabilizing circuit 3 and the horizontal output circuit 4.
次に動作について説明する。Next, the operation will be described.
水平周波数を周波数−電圧変換回路１により変換した電
圧を基準電圧として誤差増幅器２を動作させ、その誤差
出力を電圧安定化回路３へ負帰還するようにする。ここ
で周波数−電圧変換回路１の特性は第６図のように水平
周波数に直線的に比例した出力を持つものである。これ
により電圧安定化回路３の出力電圧は入力水平周波数に
比例したものとなる。The error amplifier 2 is operated using the voltage obtained by converting the horizontal frequency by the frequency-voltage conversion circuit 1 as a reference voltage, and the error output is negatively fed back to the voltage stabilization circuit 3. Here, the characteristic of the frequency-voltage conversion circuit 1 is that it has an output linearly proportional to the horizontal frequency as shown in FIG. As a result, the output voltage of the voltage stabilizing circuit 3 becomes proportional to the input horizontal frequency.
従来の水平偏向回路は以上のように構成されているの
で、水平偏向コイル６とチョークコイル５とのインダク
タンス及びコンデンサ８の容量は一定である。このた
め、水平帰線時間が一定となり、第５図のように周波数
−電圧変換回路１からの基準電圧が水平周波数に比例す
る場合は、水平周波数が高くなれば、帰線時間の割合が
表示期間に対し大きくなり相対的にラスタの水平幅が狭
くなるという課題があった。Since the conventional horizontal deflection circuit is configured as described above, the inductance of the horizontal deflection coil 6 and the choke coil 5 and the capacitance of the capacitor 8 are constant. Therefore, when the horizontal blanking time becomes constant and the reference voltage from the frequency-voltage conversion circuit 1 is proportional to the horizontal frequency as shown in FIG. 5, the ratio of the blanking time is displayed if the horizontal frequency becomes high. There is a problem in that the horizontal width of the raster becomes relatively narrow due to the increase in the period.
この発明は上記のような課題を解消するためになされた
もので、水平周波数によらず一定のラスタ幅を得ること
ができる水平偏向回路を得ることを目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain a horizontal deflection circuit capable of obtaining a constant raster width regardless of the horizontal frequency.
この発明に係る水平偏向回路は、入力水平周波数を周波
数−電圧変換回路により電圧に変換すると共に、入力水
平同期信号をトリガとし入力電圧により出力パルス幅が
変化するPWM回路に上記周波数−電圧変換回路の出力電
圧を加え、このPWM回路の出力パルスによりチョッパ形
電源回路を動作させ、その出力電圧を水平出力回路の電
源電圧としたものである。A horizontal deflection circuit according to the present invention converts an input horizontal frequency into a voltage by a frequency-voltage conversion circuit, and a PWM circuit in which an output pulse width is changed by an input voltage by using an input horizontal synchronization signal as a trigger. The output voltage of the chopper type power supply circuit is operated by the output pulse of this PWM circuit, and the output voltage is used as the power supply voltage of the horizontal output circuit.
この発明における水平偏向回路は、水平周波数に応じて
チョッパ形電源回路をドライブするパルス幅TDをTD＝Ａ
＋BfHの形に補正し、このパルスにより水平周波数でチ
ョッパ形電源回路を動作させたため、水平偏向電源とし
て第３図のようなCfH＋DfH 2の特性を持たせることがで
き、この結果、水平周波数によらず水平ラスタ幅を一定
にすることが可能となった。In the horizontal deflection circuit according to the present invention, the pulse width T D for driving the chopper type power supply circuit according to the horizontal frequency is T D = A
+ Corrects the shape of the Bf H, because of operating a chopper type power supply circuit in the horizontal frequency by the pulse, it is possible to have the characteristics of Cf H + Df H 2 as in the third diagram as a horizontal deflection power, as a result, It became possible to make the horizontal raster width constant regardless of the horizontal frequency.
以下、この発明の一実施例を図について説明する。第１
図においては、第４図と対応する部分には同一符号を付
して説明を省略する。An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, parts corresponding to those in FIG.
11は水平同期信号H.SYNCをトリガとし周波数−電圧変換
回路１の出力電圧によりパルス幅変調を行うパルス幅変
調回路（以下、PWM回路と言う）、12はPWM回路11の出力
パルスによりスイッチングを行うチョッパ回路、13はチ
ョッパ回路12の出力を平滑する平滑回路で、その出力電
圧Vaを水平出力回路４の電源電圧としてチョークコイル
５を介して供給する。Reference numeral 11 is a pulse width modulation circuit (hereinafter referred to as PWM circuit) that performs pulse width modulation by the output voltage of the frequency-voltage conversion circuit 1 using the horizontal synchronization signal H.SYNC as a trigger, and 12 is switched by the output pulse of the PWM circuit 11. A chopper circuit 13 for performing smoothing is a smoothing circuit for smoothing the output of the chopper circuit 12. The output voltage V a is supplied as a power supply voltage of the horizontal output circuit 4 through the choke coil 5.
なおチョッパ回路12及び平滑回路13によりチョッパ形電
源回路が構成されている。The chopper circuit 12 and the smoothing circuit 13 form a chopper type power supply circuit.
次に動作について説明する。Next, the operation will be described.
まず、水平帰線期間を一定とした場合に、水平出力回路
４の電源電圧がどのような特性を持てば良いかを求め
る。第２図において、Ｔは水平周期＝1/水平周波数fH、
Ｉは水平偏向電流のピーク値、Trは水平帰線期間とし、
水平偏向コイル６の特性から、水平出力回路４の電源電
圧Vaは 但し、LH＝水平偏向コイル６のインダクタンス ここでTrf≪１と考えられるので、近似として Va≒LHIfH（１＋TrfH） ≒LHIfH＋LHITrfH 2 ……（１） 上記（１）式において、LH,I,Trとも一定であるので、
水平電源電圧Vaとしては、fHに比例する第１項に加えて
fH 2に比例する第２項が必要であることが判る。第３図
は上記（１）式の特性図である。First, what characteristics the power supply voltage of the horizontal output circuit 4 should have when the horizontal blanking period is fixed is determined. In FIG. 2, T is horizontal period = 1 / horizontal frequency f H ,
I is the peak value of the horizontal deflection current, T r is the horizontal blanking period,
From the characteristics of the horizontal deflection coil 6, the power supply voltage V a of the horizontal output circuit 4 is However, L H = Since the inductance of the horizontal deflection coil 6 where considered T r f«1, V a ≒ L H If H (1 + T r f H) ≒ L H If H + L H IT r f H 2 as an approximation (1) In the above formula (1), L H , I, and T r are constant, so
In addition to the first term proportional to f H , the horizontal power supply voltage V a
It can be seen that the second term, which is proportional to f H 2 , is needed. FIG. 3 is a characteristic diagram of the above formula (1).
この実施例では、上記（１）式を満たすために、周波数
−電圧変換回路１の出力電圧（第６図）をPWM回路11に
加えることにより、その出力パルス幅に補正をかけ、こ
の出力パルスにより水平周波数でチョッパ動作を行ない
これを平滑するようにしている。PWM回路11の出力パル
ス幅TDを式で示すと、 TD＝Ａ＋BfH ……（２） となる。第４図は上記（２）式によるPWM回路11の出力
パルスを示す。第４図及び（２）式において、Ａは水平
周波数fHに無関係な項で基本パルス幅を表わし、BfHは
周波数−電圧変換回路１の出力電圧により補正された項
である。これより水平電源電圧Vaは 但し、VI:チョッパ入力電圧 T:水平周期 Va:水平電源電圧 fH:水平周波数 上記（３）式を上記式（１）と比較すると同じような形
である。よって第１図の回路によれば、水平周波数が変
化しても水平ラスタ幅が変化しない水平偏向回路が得ら
れる。In this embodiment, in order to satisfy the above formula (1), the output voltage of the frequency-voltage conversion circuit 1 (FIG. 6) is applied to the PWM circuit 11 to correct its output pulse width, and this output pulse is corrected. In order to smooth this, a chopper operation is performed at a horizontal frequency. When the output pulse width T D of the PWM circuit 11 is expressed by an equation, T D = A + Bf H (2) FIG. 4 shows the output pulse of the PWM circuit 11 according to the above equation (2). In FIG. 4 and the equation (2), A represents a basic pulse width with a term unrelated to the horizontal frequency f H , and Bf H is a term corrected by the output voltage of the frequency-voltage conversion circuit 1. Therefore, the horizontal power supply voltage Va is However, V I : Chopper input voltage T: Horizontal period V a : Horizontal power supply voltage f H : Horizontal frequency The above equation (3) is compared with the above equation (1), and it has the same form. Therefore, according to the circuit of FIG. 1, a horizontal deflection circuit in which the horizontal raster width does not change even when the horizontal frequency changes can be obtained.
以上のように、この発明によれば、水平周波数を周波数
−電圧変換回路により電圧に変換すると共に、その出力
電圧をパルス幅変調回路により水平同期信号をトリガと
してパルス幅変調し、さらに、その出力パルスによりス
イッチングレギュレータにより形成されたチョッパ形電
源回路を駆動し、その出力電圧を水平出力回路に電源電
圧として供給するように構成したので、パルス幅変調回
路の出力パルス幅TDをTD＝Ａ＋BfHの形に補正すること
ができ、さらに、この出力パルスでチョッパ形電源回路
を駆動するので、水平出力回路の電源電圧としてCfH＋D
fH 2の特性を持たせることができ、水平周波数によらず
自動的に水平ラスタ幅を一定にすることができる。ま
た、チョッパ形電源回路は、スイッチングレギュレータ
により形成されているので、消費電力を小さく抑えるこ
とができる。As described above, according to the present invention, the horizontal frequency is converted into a voltage by the frequency-voltage conversion circuit, the output voltage is pulse-width modulated by the pulse width modulation circuit using the horizontal synchronization signal as a trigger, and the output is further output. Since the chopper type power supply circuit formed by the switching regulator is driven by the pulse and its output voltage is supplied to the horizontal output circuit as the power supply voltage, the output pulse width T D of the pulse width modulation circuit is T D = A + Bf It can be corrected to H shape, and this output pulse drives the chopper type power supply circuit, so Cf H + D is used as the power supply voltage for the horizontal output circuit.
The characteristic of f H 2 can be provided, and the horizontal raster width can be automatically made constant regardless of the horizontal frequency. Moreover, since the chopper type power supply circuit is formed by the switching regulator, the power consumption can be suppressed to be small.
第１図はこの発明の一実施例による水平偏向回路を示す
構成図、第２図は水平偏向電流の波形図、第３図は水平
周波数と水平出力回路の電源電圧との関係を示す特性
図、第４図はPWM回路の出力パルスの波形図、第５図は
従来の水平偏向回路を示す構成図、第６図は同回路にお
ける周波数−電圧変換回路の特性を示す特性図である。 １は周波数−電圧変換回路、４は水平出力回路、６は水
平偏向コイル、11はパルス幅変調回路、12はチョッパ回
路、13は平滑回路。 なお、図中、同一符号は同一、又は相当部分を示す。1 is a configuration diagram showing a horizontal deflection circuit according to an embodiment of the present invention, FIG. 2 is a waveform diagram of a horizontal deflection current, and FIG. 3 is a characteristic diagram showing a relationship between a horizontal frequency and a power supply voltage of a horizontal output circuit. FIG. 4 is a waveform diagram of the output pulse of the PWM circuit, FIG. 5 is a configuration diagram showing a conventional horizontal deflection circuit, and FIG. 6 is a characteristic diagram showing characteristics of a frequency-voltage conversion circuit in the circuit. 1 is a frequency-voltage conversion circuit, 4 is a horizontal output circuit, 6 is a horizontal deflection coil, 11 is a pulse width modulation circuit, 12 is a chopper circuit, and 13 is a smoothing circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
出力回路と、水平周波数を電圧に変換する周波数−電圧
変換回路と、水平同期信号により駆動され上記周波数−
電圧変換回路の出力電圧をパルス幅変調するパルス幅変
調回路と、スイッチングレギュレータにより形成される
と共に、上記パルス幅変調回路の出力パルスにより駆動
され、その出力電圧を上記水平出力回路に電源電圧とし
て供給するチョッパ形電源回路とを備えた水平偏向回
路。1. A horizontal output circuit for flowing a horizontal deflection current through a horizontal deflection coil, a frequency-voltage conversion circuit for converting a horizontal frequency into a voltage, and a frequency-voltage conversion circuit driven by a horizontal synchronization signal.
It is formed by a pulse width modulation circuit for pulse width modulating the output voltage of the voltage conversion circuit and a switching regulator, and is driven by the output pulse of the pulse width modulation circuit, and supplies the output voltage to the horizontal output circuit as a power supply voltage. Horizontal deflection circuit having a chopper type power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2132839A JPH0748807B2 (en) | 1990-05-23 | 1990-05-23 | Horizontal deflection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2132839A JPH0748807B2 (en) | 1990-05-23 | 1990-05-23 | Horizontal deflection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0429471A JPH0429471A (en) | 1992-01-31 |
| JPH0748807B2 true JPH0748807B2 (en) | 1995-05-24 |
Family
ID=15090727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2132839A Expired - Fee Related JPH0748807B2 (en) | 1990-05-23 | 1990-05-23 | Horizontal deflection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0748807B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000307887A (en) | 1999-04-16 | 2000-11-02 | Matsushita Electric Ind Co Ltd | Deflection device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63310276A (en) * | 1987-06-12 | 1988-12-19 | Victor Co Of Japan Ltd | Power source circuit for horizontal deflection output circuit |
| JPH07114455B2 (en) * | 1987-07-13 | 1995-12-06 | 株式会社日立製作所 | Horizontal size adjustment circuit |
-
1990
- 1990-05-23 JP JP2132839A patent/JPH0748807B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0429471A (en) | 1992-01-31 |
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