JPH0445295Y2 - - Google Patents
Info
- Publication number
- JPH0445295Y2 JPH0445295Y2 JP9976185U JP9976185U JPH0445295Y2 JP H0445295 Y2 JPH0445295 Y2 JP H0445295Y2 JP 9976185 U JP9976185 U JP 9976185U JP 9976185 U JP9976185 U JP 9976185U JP H0445295 Y2 JPH0445295 Y2 JP H0445295Y2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- current
- voltage
- sawtooth wave
- charging
- 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 37
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Details Of Television Scanning (AREA)
- Direct Current Feeding And Distribution (AREA)
- Dc-Dc Converters (AREA)
- Control Of Voltage And Current In General (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、鋸歯状波発生回路に関する。[Detailed explanation of the idea] [Industrial application field] The present invention relates to a sawtooth wave generation circuit.
従来、テレビジヨン受像機の垂直偏向等に使用
される鋸歯状波発生回路は、第3図に示すものが
知られている。まず、図においてコンデンサC1
は定電流源I0によつて定電流充電され、オン・オ
フ入力信号によつて制御されるスイツチSW1によ
つて周期的に放電されることで電圧E0に鋸歯状
波を得る。この鋸歯状波電圧E0は、高入力イン
ピーダンスのバツフアアンプAmpによつて低出
力インピーダンスで取出され、直流カツト用コン
デンサC2を通して負荷抵抗R2の電圧出力OUTと
して取出される。この電圧出力OUTの波形を第
4図に示す。
2. Description of the Related Art Conventionally, a sawtooth wave generating circuit used for vertical deflection of television receivers, etc. is shown in FIG. 3. First, in the diagram capacitor C 1
is charged at a constant current by a constant current source I 0 and periodically discharged by a switch SW 1 controlled by an on/off input signal to obtain a sawtooth waveform in the voltage E 0 . This sawtooth wave voltage E 0 is taken out at a low output impedance by a buffer amplifier Amp with a high input impedance, and is taken out as a voltage output OUT of a load resistor R 2 through a DC cut capacitor C 2 . The waveform of this voltage output OUT is shown in FIG.
従来の回路において、コンデンサC1の充電電
圧E0にはほぼ完全な鋸歯状波形が得られるが、
その後段における伝送系でコンデンサC2を通し
た電圧出力OUTに同程度の特性を持つ鋸歯状波
を得るには、コンデンサC2と抵抗R2の時定数が
電圧出力OUTの周期に比べて十分に大きいもの
を必要とする。このめ、低い周波数の鋸歯状波を
得るには、負荷抵抗R2が小さくなるに応じて非
常に大きな容量のコンデンサC2を必要とし、電
源投入時回路が安定するのが遅れる問題があつ
た。
In the conventional circuit, the charging voltage E 0 of the capacitor C 1 has an almost perfect sawtooth waveform,
In order to obtain a sawtooth wave with similar characteristics to the voltage output OUT passed through the capacitor C 2 in the subsequent transmission system, the time constant of the capacitor C 2 and resistor R 2 must be sufficient compared to the period of the voltage output OUT. need something big. Therefore, in order to obtain a sawtooth waveform with a low frequency, a capacitor C 2 with a very large capacity is required as the load resistance R 2 becomes smaller, which causes a delay in the circuit stabilizing when the power is turned on. .
本考案は、上記問題点に鑑みてなされたもの
で、コンデンサには定電流源のほかに該コンデン
サの充電電圧に比較した電流出力になる電流発生
回路からの充電電流を供給し、コンデンサの充電
電圧をアンプ及び直流カツト用コンデンサを介し
て負荷抵抗に鋸歯状波出力を得るように構成され
ている。
The present invention was developed in view of the above problems, and in addition to a constant current source, the capacitor is supplied with a charging current from a current generating circuit that outputs a current compared to the charging voltage of the capacitor, thereby charging the capacitor. It is configured to provide a sawtooth wave output to a load resistor through a voltage amplifier and a DC cut capacitor.
上記の構成を有する本考案は、コンデンサには
該コンデンサの充電電圧に比例した電流を定電流
の充電電流に加算することで充電電圧に対して二
乗曲線で上昇する波形を得、この電圧を時定数を
設定した直流カツト用コンデンサと抵抗の回路を
通すことで直線的に上昇する鋸歯状波出力を得
る。
The present invention having the above configuration adds a current proportional to the charging voltage of the capacitor to a constant charging current to obtain a waveform that rises in a square curve with respect to the charging voltage, and this voltage is changed over time. A linearly rising sawtooth wave output is obtained by passing it through a DC cut capacitor and resistor circuit with a set constant.
以下、本考案の一実施例を第1図および第2図
を参照して説明する。まず、第1図においてコン
デンサC1の充電電圧端には、エミツタ抵抗R1を
持つエミツタホロワ接続のトランジスタQ1が接
続さえる。このトランジスタQ1のコレクタには、
トランジスタQ2,Q3のカレントミラー回路の一
方のトランジスタQ2が負荷抵抗として接続され、
他方のトランジスタQ3が、トランジスタQ2と同
じベース電位でコンデンサC1の充電電圧端に接
続される。こうしたトランジスタQ1〜Q3と抵抗
R1で構成される回路によつて、コンデンサC1の
充電電圧E0に比例した電流出力をトランジスタ
Q3に得て、該コンデンサC1に充電電流を供給す
る。
Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, in FIG. 1 , an emitter follower connected transistor Q1 having an emitter resistor R1 is connected to the charging voltage terminal of the capacitor C1. The collector of this transistor Q1 has
One transistor Q 2 of the current mirror circuit of transistors Q 2 and Q 3 is connected as a load resistor,
The other transistor Q 3 is connected to the charging voltage end of the capacitor C 1 with the same base potential as the transistor Q 2 . These transistors Q 1 to Q 3 and resistors
The circuit consisting of R 1 allows the transistor to output a current proportional to the charging voltage E 0 of capacitor C 1 .
Q 3 and supplies charging current to the capacitor C 1 .
コンデンサC1には、直列にダイオードD1が接
続され、トランジスタQ1のベース・エミツタ間
電圧が補償される。 A diode D 1 is connected in series to the capacitor C 1 to compensate for the base-emitter voltage of the transistor Q 1 .
コンデンサC1の充電電圧E0は、バツフアアン
プAmpの出力OUT1として、さらにコンデンサ
C3を通して負荷抵抗R2の電圧出力OUT2として取
出される。 The charging voltage E 0 of the capacitor C 1 is further connected to the capacitor as the output OUT 1 of the buffer amplifier Amp.
It is taken out as the voltage output OUT 2 of the load resistor R 2 through C 3 .
こうした構成において、コンデンサC1にはそ
れを充電する定電流源I0の電流のほかに、カレン
トミラー回路によつてコンデンサC1の充電電圧
E0により抵抗R1に流れる電流と同量の補正用電
流Icが、トランジスタQ3から供給加算される。
このとき、コンデンサC1の電圧E0と補正用電流Ic
は時間tの関数として以下の式のような関係にな
る。 In this configuration, capacitor C 1 receives not only the current of constant current source I 0 that charges it, but also the charging voltage of capacitor C 1 by the current mirror circuit.
A correction current Ic equal to the current flowing through the resistor R1 due to E0 is added and supplied from the transistor Q3 .
At this time, the voltage E 0 of capacitor C 1 and the correction current Ic
has the following relationship as a function of time t.
E0={(I0+Ic)/C1}t ……(1)
Ic=E0/R1 ……(2)
この(1),(2)式から
E0=(I0+E0/R1)t/C1
=I0t/C1+E0t/(R1,C1)
E0につてまとめると、
E0{1−t/(R1,C1)}=I0t/C
これより、
E0=I0t/C1/{1−t/(R1,C1)}
=I0、R1t/(R1,C1−t) ……(3)
となり、第2図にバツフアアンプAmpの出力
OUT1として示すように、二次関数的に上昇する
波形となる。 E 0 = {(I 0 + Ic) / C 1 }t ... (1) Ic = E 0 / R 1 ... (2) From equations (1) and (2), E 0 = (I 0 + E 0 / R 1 ) t/C 1 = I 0 t/C 1 + E 0 t/(R 1 , C 1 ) To summarize E 0 , E 0 {1-t/(R 1 , C 1 )}=I 0 t/C From this, E 0 = I 0 t/C 1 / {1-t/(R 1 , C 1 )} = I 0 , R 1 t/(R 1 , C 1 - t) ...(3 ), and Figure 2 shows the output of the buffer amplifier Amp.
As shown as OUT1, the waveform rises quadratically.
さて、第1図のコンデンサC3と抵抗R2からな
る回路における応答は入出力電圧をそれぞれ
OUT1,OUT2とすると、一般的に、
OUT2=OUT1×exp(−t/(R2,C3))で表
され、ここでt≪R2,C3の条件において、
OUT2≒OUT1{1−t/(R2,C3)} ……(4)
と近似される。 Now, the response in the circuit consisting of capacitor C 3 and resistor R 2 in Figure 1 is as follows:
Assuming OUT1 and OUT2, it is generally expressed as OUT2=OUT1×exp(-t/(R 2 , C 3 )), where, under the condition of t<<R 2 , C 3 , OUT2≒OUT 1 {1 -t/(R 2 , C 3 )} ...(4) It is approximated as follows.
ここで、前述のとおり、OUT1=E0であるか
ら、(3),(4)式より、
OUT2≒{I0,R1t/(R1,C1−t)}
{1−t/(R2,C3)}
={I0,R1t(R2C3−t)}
/{(R1,C1−t)R2,C3}
今、R2,C3=R1,C1の条件であれば、
OUT2≒I0,R1t/(R2,C3)
=I0,R1t/(R1,C1)
=(I0/C1)t ……(5)
となり、電圧出力OUT2は時間tに比例して上昇
する鋸歯状波になる。 Here, as mentioned above, since OUT 1 = E 0 , from equations (3) and (4), OUT2≒{I 0 , R 1 t/(R 1 , C 1 - t)} {1-t /(R 2 , C 3 )} = {I 0 , R 1 t (R 2 C 3 − t)} / {(R 1 , C 1 − t) R 2 , C 3 } Now, R 2 , C 3 = R 1 , C 1 conditions, OUT2≒I 0 , R 1 t/(R 2 , C 3 ) = I 0 , R 1 t/(R 1 , C 1 ) = (I 0 /C 1 )t...(5), and the voltage output OUT2 becomes a sawtooth wave that rises in proportion to time t.
したがつて、コンデンサC3をC3,R2=C1,R1
の条件を満す容量に設定することで、鋸歯状波出
力OUT2を歪みなく得ることができる。このと
き、コンデンサC3の容量は小さくでき、電源投
入時に安定するまでの時間を短縮することができ
る。 Therefore, the capacitor C 3 is C 3 , R 2 = C 1 , R 1
By setting the capacitance to meet the following conditions, the sawtooth wave output OUT2 can be obtained without distortion. At this time, the capacitance of capacitor C3 can be reduced, and the time required for stabilization when the power is turned on can be shortened.
なお、上記実施例においてカレントミラー回路
の構成は適宜変更できるもので、コンデンサC1
の充電電圧E0に比例した補正用電流Icを供給でき
るものであれば良い。 In the above embodiment, the configuration of the current mirror circuit can be changed as appropriate, and the capacitor C 1
Any device that can supply a correction current Ic proportional to the charging voltage E 0 is sufficient.
以上のとおり、本考案によれば、コンデンサを
充電して鋸歯状波を得るのに、コンデンサの充電
電圧に比例した電流を加算した充電電流としたの
で、コンデンサの電圧波形を直流カツト用コンデ
ンサを通して出力する際に、該直流カツト用コン
デンサの容量を小さくしてリニアリテイの良好な
鋸歯状波出力を得ることができ、低周波用に適用
してコストダウンを実現すると共に、電源投入時
に安定するまでの時間を短縮できる効果がある。
As described above, according to the present invention, in order to charge the capacitor and obtain a sawtooth wave, the charging current is obtained by adding a current proportional to the charging voltage of the capacitor, so the voltage waveform of the capacitor is passed through the DC cutting capacitor. When outputting, it is possible to obtain a sawtooth wave output with good linearity by reducing the capacitance of the DC cut capacitor, and it is possible to reduce costs by applying it to low frequencies, and to stabilize it when the power is turned on. This has the effect of shortening the time required.
第1図は本考案の一実施例を示す回路図、第2
図は第1図における電圧出力波形図、第3図は従
来の回路図、第4図は第3図の出力波形図であ
る。
C1,C3……コンデンサ、I0……定電流源、SW1
……スイツチ、Q1〜Q3……トランジスタ、R1,
R2……抵抗、Amp……バツフアアンプ。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figures are a voltage output waveform diagram in FIG. 1, FIG. 3 is a conventional circuit diagram, and FIG. 4 is an output waveform diagram in FIG. 3. C 1 , C 3 ... Capacitor, I 0 ... Constant current source, SW 1
...Switch, Q 1 ~ Q 3 ... Transistor, R 1 ,
R 2 ...Resistor, Amp...Buffer amplifier.
Claims (1)
ンデンサに充電電流を供給する電流発生回路と、 前記コンデンサの充電電圧を取出すアンプと、 このアンプ出力を直流カツト用コンデンサを通
して負荷抵抗に鋸歯状波出力を得る伝送系とを備
えたことを特徴とする鋸歯状波発生回路。[Scope of Claim for Utility Model Registration] A constant current source that charges a capacitor with a constant current, a current generating circuit that supplies a charging current to the capacitor with a current proportional to the charging voltage of the capacitor, and an amplifier that extracts the charging voltage of the capacitor. 1. A sawtooth wave generation circuit comprising: and a transmission system for transmitting the amplifier output through a DC cut capacitor to obtain a sawtooth wave output to a load resistor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9976185U JPH0445295Y2 (en) | 1985-06-28 | 1985-06-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9976185U JPH0445295Y2 (en) | 1985-06-28 | 1985-06-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS628728U JPS628728U (en) | 1987-01-20 |
JPH0445295Y2 true JPH0445295Y2 (en) | 1992-10-26 |
Family
ID=30968941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9976185U Expired JPH0445295Y2 (en) | 1985-06-28 | 1985-06-28 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0445295Y2 (en) |
-
1985
- 1985-06-28 JP JP9976185U patent/JPH0445295Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS628728U (en) | 1987-01-20 |
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