JPS5840663Y2 - Variable time constant circuit - Google Patents
Variable time constant circuitInfo
- Publication number
- JPS5840663Y2 JPS5840663Y2 JP1978112055U JP11205578U JPS5840663Y2 JP S5840663 Y2 JPS5840663 Y2 JP S5840663Y2 JP 1978112055 U JP1978112055 U JP 1978112055U JP 11205578 U JP11205578 U JP 11205578U JP S5840663 Y2 JPS5840663 Y2 JP S5840663Y2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- circuit
- time constant
- variable
- resistor
- 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
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- Pulse Circuits (AREA)
- Electronic Switches (AREA)
Description
【考案の詳細な説明】
本考案は例えば時定数回路の充放電作用を利用して外部
回路の動作を制御する時定数可変回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable time constant circuit that controls the operation of an external circuit by utilizing, for example, the charging and discharging action of the time constant circuit.
一般に例えば、時定数回路の充放電動作がら得られる信
号によって外部回路の動作を制御するような回路を第１
図に示す。Generally, for example, a circuit that controls the operation of an external circuit by a signal obtained from the charging/discharging operation of a time constant circuit is used as the first circuit.
As shown in the figure.
図において１は電源回路、２はコンデンサ、３は可変抵
抗器、４はトリガ回路、５はトリガ回路４がらのトリガ
信号によって駆動される外部回路である。In the figure, 1 is a power supply circuit, 2 is a capacitor, 3 is a variable resistor, 4 is a trigger circuit, and 5 is an external circuit driven by a trigger signal from the trigger circuit 4.
この回路は、電源回路１から電圧が一定期間印加されて
コンテ゛ンサ２に充電すると共にトリガ回路４を駆動し
て外部回路５を動作させ、しがる後コンデンサ２と可変
抵抗器３とで構成される放電回路を利用してコンデンサ
２に充電されていた充電電圧を放電し、Ｋ点の電圧降下
によりトリガ回路４をスレッシュホールドレベルでオフ
させることにより外部回路５の動作を停止させている。This circuit consists of a capacitor 2 and a variable resistor 3 after a voltage is applied from a power supply circuit 1 for a certain period of time to charge a capacitor 2 and drive a trigger circuit 4 to operate an external circuit 5. The charging voltage stored in the capacitor 2 is discharged using a discharge circuit, and the trigger circuit 4 is turned off at a threshold level due to the voltage drop at the K point, thereby stopping the operation of the external circuit 5.
このような回路では、コンデンサ２の放電開始からトリ
ガ回路４のスレシュホールドレベルに達するまでの時間
ｔは第２図に示すように放電回路の時定数で決まり、こ
の時定数の変化はコンデンサ２と可変抵抗器３で決定さ
れている。In such a circuit, the time t from the start of discharge of capacitor 2 until reaching the threshold level of trigger circuit 4 is determined by the time constant of the discharge circuit as shown in Figure 2, and the change in this time constant is It is determined by variable resistor 3.
更に一定のスレシュホールドレベルに対して取り得るｔ
の値の変化範囲は、可変抵抗器で実際に使える抵抗値の
範囲、可変抵抗の特性等で制限される。Moreover, t can be taken for a certain threshold level.
The range of change in the value of is limited by the range of resistance values that can actually be used with the variable resistor, the characteristics of the variable resistor, etc.
しかも、コンデンサ２の充電容量は電源１からの電流供
給量に対して有限であると共に可変抵抗器３はその両端
において抵抗値変化を連続的に操作できない事（すなわ
ち可変抵抗器には使用不可能な両端の微小抵抗範囲があ
る事）がある為時定数の変化量を大きくとれない。Moreover, the charging capacity of the capacitor 2 is limited with respect to the amount of current supplied from the power source 1, and the variable resistor 3 cannot be used to continuously change the resistance value at both ends (in other words, it cannot be used as a variable resistor). (There is a small resistance range at both ends), so it is not possible to make a large amount of change in the time constant.
即ちコンデンサ２の容量をＣ１可変抵抗器３の全抵抗値
をＲとし、可変抵抗器３の使用不可能な両端部抵抗の比
率をａ％とすると、時定数の変化量はａ−ｃ・Ｒ／１０
０から（１００−ａ ） Ｃ−Ｒ／１００まマノ間にあ
り、その比は
と小さくしかもこの時定数によって外部回路５を駆動す
る時間が決定されるという不都合がある。That is, if the capacitance of the capacitor 2 is C1, the total resistance value of the variable resistor 3 is R, and the ratio of unusable resistance at both ends of the variable resistor 3 is a%, then the amount of change in the time constant is a-c・R. /10
The ratio is between 0 and (100-a)C-R/100, and the ratio is very small, and the time constant for driving the external circuit 5 is determined by this time constant, which is disadvantageous.
本考案は上記の点に鑑みてなされたもので、コンテ゛ン
サと可変抵抗器によって時定数を変化させる回路に対し
て１個のコンデンサの追加のみで時定数の変化量を大幅
に改善できるようにした時定数可変回路を提供すること
を目的とする。The present invention was developed in view of the above points, and it is possible to significantly improve the amount of change in the time constant by adding only one capacitor to a circuit that changes the time constant using a capacitor and a variable resistor. The purpose of this invention is to provide a variable time constant circuit.
以下図面を参照して本考案の実施例を説明する。Embodiments of the present invention will be described below with reference to the drawings.
第２図に示す回路において、１１は電源回路で、１２は
所定のスレッシュホールドレベルを有するトリガ回路、
１３はこのトリガ回路によって駆動あるいは停止する外
部回路、１４は電源回路１１とアース間に接続された第
１のコンテ゛ンサ、１５は一端がアース接地され、他端
が前記第１のコンテ゛ンサ１４と電源回路１１との接続
点に接続された第２のコンテ゛ンサである。In the circuit shown in FIG. 2, 11 is a power supply circuit, 12 is a trigger circuit having a predetermined threshold level,
13 is an external circuit that is driven or stopped by this trigger circuit; 14 is a first capacitor connected between the power supply circuit 11 and the ground; and 15, one end is grounded and the other end is connected between the first capacitor 14 and the power supply circuit. 11 is a second capacitor connected to the connection point with 11.
１６はこの第２のコンデンサの一端とアース間に抵抗体
１７が接続され、摺動端１８が前記第１のコンデンサの
一端に接続された可変抵抗器である。A variable resistor 16 has a resistor 17 connected between one end of the second capacitor and the ground, and a sliding end 18 connected to one end of the first capacitor.
上記の様に構成された回路において、今、電源回路１１
から電圧が各部に供給されると、電流は電源回路１１か
ら第１のコンデンサ１４と可変抵抗器１６を通じて第２
のコンテ゛ンサに流れ、これら第１及び第２のコンデン
サ１４．１５を充電する。In the circuit configured as described above, the power supply circuit 11
When voltage is supplied to each part from
and charges the first and second capacitors 14 and 15.
一方に点の電位は電源電圧まで上昇するので、トリガ回
路１２はオン動作し、これによって外部回路１３を駆動
する。On the other hand, since the potential at the point rises to the power supply voltage, the trigger circuit 12 turns on, thereby driving the external circuit 13.
電源回路１１からの電流が一定期間後に停止すると、第
１のコンテ゛ンサ１４に蓄積されていた電荷は摺動端１
８及び抵抗体１７の一部分（ＡＢ間の抵抗）を通じて放
電すると共に第２のコンデンサ１５に蓄積されていた電
荷はＡＣ間の抵抗体１７を通じて放電する。When the current from the power supply circuit 11 stops after a certain period of time, the charge accumulated in the first capacitor 14 is transferred to the sliding end 1.
8 and a part of the resistor 17 (the resistance between AB), and the charge accumulated in the second capacitor 15 is discharged through the resistor 17 between AC.
このような放電時における第３図の放電回路の等価回路
を第４図に示す。FIG. 4 shows an equivalent circuit of the discharge circuit of FIG. 3 during such discharge.
図において抵抗Ｒ１は可変抵抗器の抵抗体１７のＡＢ間
の抵抗であり、抵抗Ｒ２はＢＣ間の抵抗である。In the figure, resistance R1 is the resistance between AB and BC of the resistor 17 of the variable resistor, and resistance R2 is the resistance between BC.
放電を開始するとＢ点の電圧は下降し、それによってに
点の電圧も下降する。When discharge starts, the voltage at point B drops, and as a result, the voltage at point B also drops.
Ｋ点の電圧が下がり、トリガ回路１２のスレシュホール
ドレベル迄達するとトリガ回路１２はオフし、これに接
続されている外部回路１３はその動作を停止する。When the voltage at point K decreases and reaches the threshold level of the trigger circuit 12, the trigger circuit 12 is turned off and the external circuit 13 connected thereto stops its operation.
上記等価回路における抵抗Ｒ１，Ｒ２の関係がＲ１りＲ
２で゛あれは゛第１及び゛第２のコンデ゛ンサ１４，１
５の容量を夫々Ｃ１，Ｃ２とすると、放電時定数はＣ１
゜Ｒ１であり、Ｒ１〉Ｒ２であれば、放電時定数は（Ｃ
１十Ｃ，）Ｒ，となり、可変抵抗器１６の摺動に対し時
定数の変化量を従来と比べて大きくすることができる。The relationship between resistors R1 and R2 in the above equivalent circuit is R1 and R
2, that is the first and second capacitors 14, 1
If the capacitances of 5 are C1 and C2, respectively, the discharge time constant is C1
°R1, and if R1>R2, the discharge time constant is (C
10C, )R, and the amount of change in the time constant due to the sliding of the variable resistor 16 can be made larger than in the conventional case.
従って摺動端１８を移動し、可変抵抗器１６の抵抗値を
変えると放電時定数が変わるので、トリガ回路１２がオ
ン動作してからオフするまでの時間を可変でき、この時
間に応じて外部回路１３の動作を制御することができる
。Therefore, by moving the sliding end 18 and changing the resistance value of the variable resistor 16, the discharge time constant changes, so the time from when the trigger circuit 12 turns on to when it turns off can be varied. The operation of the circuit 13 can be controlled.
今、可変抵抗器１６の抵抗体１７の使用不可能な面抵抗
体の比率をａ％とすると、Ｃ１〈Ｃ２の場合には最小時
定数は約Ｃ１Ｒａとなり、最大時定数は約（Ｃ，＋Ｃ２
）Ｒ（１００−ａ）トなル。Now, if the ratio of the unusable sheet resistor of the resistor 17 of the variable resistor 16 is a%, in the case of C1<C2, the minimum time constant is approximately C1Ra, and the maximum time constant is approximately (C, +C2
) R (100-a) Tor.
従ッテ本回路ニおいて時定数はＣ１Ｒａから（Ｃ，＋Ｃ
２）Ｒ（１００−ｂ）まで変化出来、最大時定数に対す
る最小時定数の割合は
となる。In this circuit, the time constant is from C1Ra to (C, +C
2) It can be varied up to R(100-b), and the ratio of the minimum time constant to the maximum time constant is.
これは従来の回路の割合と比べると倍数定数可変範囲が
大きくなることを意味する。This means that the variable range of the multiple constant becomes larger compared to the ratio of conventional circuits.
この割合から理解できるように第１のコンデンサ１４の
容量Ｃ１を第２のコンデンサ１５の容量Ｃ２に比べて小
さくすればより時定数の可変範囲を大きくとれることが
わかるであろう。As can be understood from this ratio, if the capacitance C1 of the first capacitor 14 is made smaller than the capacitance C2 of the second capacitor 15, the variable range of the time constant can be made wider.
上述した回路によれば、従来のコンテ゛ンサと可変抵抗
器によって時定数を変化させた回路に比べ、コンテ゛ン
サを１個追加するのみで、従来より更に幅広く時定数の
変化量をとることができると共に可変抵抗器の両端の抵
抗変化が不連続なるが由に時定数の変化量が狭く制限さ
れていた従来の問題を解決する事ができる。According to the circuit described above, compared to a conventional circuit in which the time constant is changed using a capacitor and a variable resistor, by adding only one capacitor, it is possible to take a wider range of changes in the time constant than before, and it is also variable. It is possible to solve the conventional problem in which the amount of change in the time constant is narrowly limited because the resistance change at both ends of the resistor is discontinuous.
次に本考案の他の実施例を第５図を参照して説明する。Next, another embodiment of the present invention will be described with reference to FIG.
第５図の回路は前述した第３図の回路にダイオード１９
を追加したものである。The circuit of FIG. 5 has a diode 19 added to the circuit of FIG.
is added.
このダイオード１９は可変抵抗器１６と第２のコンデン
サ１５との接続点と電源回路１１との間に接続されてい
る。This diode 19 is connected between the connection point between the variable resistor 16 and the second capacitor 15 and the power supply circuit 11.
これは前述した第３図の回路では第１のコンテ゛ンサ１
４に対しては電源電圧を直接印加し、第２のコンデンサ
１５に対しては可変抵抗器１６のＢＣ間の抵抗を介して
初期電荷を与えていたのに対し、第５図の回路では、電
荷電圧がそのまま第１及び第２のコンデンサ１４．１５
の両端に印加されることを意味する。This is because the first capacitor 1 in the circuit shown in FIG.
4, the power supply voltage was directly applied, and an initial charge was given to the second capacitor 15 through the resistance between BC of the variable resistor 16. However, in the circuit shown in FIG. The charge voltage remains unchanged in the first and second capacitors 14.15
This means that it is applied to both ends of .
このことは電源回路１１がらの充電電流力寸分の時間を
おいてコンデンサ１４．１５に供給される場合にはダイ
オード１９は無くてもよいが何らかの理由により十分な
期間充電電流が供給されない時には第２のコンデンサ１
５には電荷が十分に蓄積されず、そのため放電時に点電
位がトリガ回路１２のスレッシュホールドレベルに達す
る時間が早くなり外部回路１３動作上不都合を生ずる。This means that if the charging current from the power supply circuit 11 is supplied to the capacitors 14 and 15 after a time interval, the diode 19 may be omitted, but if for some reason the charging current is not supplied for a sufficient period of time, the second capacitor 1
5 does not accumulate sufficient charge, and therefore, during discharge, the time for the point potential to reach the threshold level of the trigger circuit 12 is shortened, causing problems in the operation of the external circuit 13.
この不都合を解決するためにダイオード１９を設けて、
第２のコンデンサ１５に十分電荷が蓄積されるようにし
て、放電時におけるに点の電位がスレッシュホールドレ
ベルに達する時間を長くするにしている。In order to solve this inconvenience, a diode 19 is provided,
Sufficient charge is stored in the second capacitor 15, so that the time required for the potential at the point to reach the threshold level during discharge is lengthened.
この回路も前述した回路と同様の動作をし、同様の効果
を有すると共に更に、コンテ゛ンサと可変抵抗器の放電
による電圧変化を利用して電子回路を制御する時の制御
レンジもダイオードを追加することにより広くなる。This circuit operates in the same way as the circuit described above, and has the same effect.Additionally, the control range when controlling electronic circuits using the voltage changes caused by the discharge of the capacitor and variable resistor can be increased by adding a diode. wider.
以上説明したように本考案によれば、コンデンサと可変
抵抗器とによって時定数を変化させる回路に対し、１個
のコンデンサを追加するのみで時定数の変化量を大幅に
改善できる時定数変化回路を提供することができる。As explained above, the present invention provides a time constant changing circuit that can significantly improve the amount of time constant change by simply adding one capacitor to a circuit that changes the time constant using a capacitor and a variable resistor. can be provided.
第１図は従来の時定数回路を利用して外部回路の動作を
制御する回路図、第２図は第１図の回路を説明するため
の電圧波形図、第３図は本考案の一実施例に係る時定数
可変回路図、第４図は第３図の回路における放電時の等
他回路図、第５図は本考案の他の実施例に係る時定数可
変回路図である。
１１・・・・・・電源回路、１４・・・・・・第１のコ
ンデンサ、１５・・・・・・第２のコンデ゛ンサ、１６
・・曲可変抵抗器、１７・・・・・・抵抗体、１８・・
・・・・摺動端、１９・・曲ダイオード。Figure 1 is a circuit diagram that uses a conventional time constant circuit to control the operation of an external circuit, Figure 2 is a voltage waveform diagram to explain the circuit in Figure 1, and Figure 3 is an implementation of the present invention. FIG. 4 is a diagram of a variable time constant circuit according to an example, FIG. 4 is a circuit diagram of the circuit shown in FIG. 3 during discharging, etc., and FIG. 5 is a diagram of a variable time constant circuit according to another embodiment of the present invention. 11...Power supply circuit, 14...First capacitor, 15...Second capacitor, 16
... Curved variable resistor, 17... Resistor, 18...
...Sliding end, 19...Curved diode.
Claims (3)
続された第１のコンデンサと、上記基準電位に一端が接
続された第２のコンデンサと、この第２のコンデンサの
他端と前記基準電位との間に抵抗体が接続され、摺動端
が前記第１のコンデンサと電源とに接続された可変抵抗
を少なくとも有する時定数可変手段とを具備する時定数
可変回路。(1) A first capacitor having one end connected to a power supply and the other end connected to a reference potential, a second capacitor having one end connected to the reference potential, and the other end of this second capacitor. A variable time constant circuit comprising: a variable time constant means having at least a variable resistor having a resistor connected between the reference potential and a sliding end connected to the first capacitor and a power source.
端と基準電源との間に抵抗体が接続され、摺動端が前記
第１のコンテ゛ンサの一方端に接続された可変抵抗と、
前記第１のコンデ゛ンサの一方端と前記第２のコンデン
サの一方端との間に介在接続され、前記第１及び第２の
コンデンサに供給する初期電圧を等しくする一方向素子
とからなることを特徴とする前記実用新案登録請求の範
囲第１項に記載の時定数可変回路。(2) The time constant variable means includes a variable resistor in which a resistor is connected between one end of the second capacitor and a reference power source, and a sliding end is connected to one end of the first capacitor;
a unidirectional element connected between one end of the first capacitor and one end of the second capacitor to equalize the initial voltages supplied to the first and second capacitors; The variable time constant circuit according to claim 1 of the utility model registration claim.
容量に対して大きくしたことを特徴とする前記実用新案
登録請求の範囲第１項乃至第２項のいずれかに記載の時
定数可変回路。(3) The variable time constant circuit according to any one of claims 1 to 2 of the utility model registration claim, characterized in that the capacitance of the second capacitor is larger than the capacitance of the first capacitor. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978112055U JPS5840663Y2 (en) | 1978-08-16 | 1978-08-16 | Variable time constant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978112055U JPS5840663Y2 (en) | 1978-08-16 | 1978-08-16 | Variable time constant circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5529842U JPS5529842U (en) | 1980-02-26 |
| JPS5840663Y2 true JPS5840663Y2 (en) | 1983-09-13 |
Family
ID=29060499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978112055U Expired JPS5840663Y2 (en) | 1978-08-16 | 1978-08-16 | Variable time constant circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5840663Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615409A (en) * | 1984-05-30 | 1986-01-11 | Fujitsu Ltd | Manufacture of magnetic head |
| JPS61145316U (en) * | 1985-02-28 | 1986-09-08 | ||
| JPH04212705A (en) * | 1990-05-28 | 1992-08-04 | Kobe Steel Ltd | Abrasion resistant magnetic head and production thereof |
| JP2730440B2 (en) * | 1993-02-12 | 1998-03-25 | キヤノン電子 株式会社 | Magnetic head |
-
1978
- 1978-08-16 JP JP1978112055U patent/JPS5840663Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5529842U (en) | 1980-02-26 |
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