JPS63305720A - Ripple removing circuit - Google Patents
Ripple removing circuitInfo
- Publication number
- JPS63305720A JPS63305720A JP62140755A JP14075587A JPS63305720A JP S63305720 A JPS63305720 A JP S63305720A JP 62140755 A JP62140755 A JP 62140755A JP 14075587 A JP14075587 A JP 14075587A JP S63305720 A JPS63305720 A JP S63305720A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- capacitor
- diode
- circuit
- ripple
- 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 description 7
- 230000007257 malfunction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はリップル除去回路に関し、例えば所定の負荷が
接続されたＡＣ回路に挿入されたヒユーズが切断したこ
とをＤＣレベルによって検知するヒユーズ切断警報回路
などに用いられるリップル除去回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ripple removal circuit, and for example, a fuse disconnection alarm that detects by DC level that a fuse inserted in an AC circuit to which a predetermined load is connected has disconnected. This invention relates to ripple removal circuits used in circuits and the like.
第２図は従来技術におけるリップル除去回路を例示する
もので、Ｆは、交流電源Ｓと負荷りとからなる所定の交
流回路に挿入されたヒユーズを示すｅＤｊは該ヒユーズ
Ｆと並列に接続されたダイオードを示すもので、正常動
作時には該ダイオードＤ！の両端には何等電圧を生じな
いが、該ヒユーズＦの切断時には、該ダイオードＤ！の
両端に、該交流電源電圧を半波整流（場合によっては該
ダイオードＤ！と逆並列に接続されたダイオードを更に
設けて全波整流してもよい）した信号電圧（所謂リップ
ル分を含んだ信号電圧）が現れる。FIG. 2 shows an example of a ripple removal circuit in the prior art, in which F represents a fuse inserted into a predetermined AC circuit consisting of an AC power supply S and a load; This indicates a diode.During normal operation, the diode D! No voltage is generated across the diode D!, but when the fuse F is cut, the diode D! A signal voltage (including the so-called ripple component) obtained by half-wave rectification of the AC power supply voltage (in some cases, a diode connected in anti-parallel with the diode D! may be further provided for full-wave rectification) is placed across the AC power supply voltage. signal voltage) appears.
このようにしてヒユーズ切断時に所定の信号電圧を生ず
ると、該信号電圧によって該ダイオードＤ！とフォトカ
ブラを構成するトランジスタＴ！および次段のトランジ
スタＴ、が順次オンとなり、該トランジスタＴい抵抗Ｒ
、／およびコンデンサＣ３を通る回路によって所定の時
定数Ｃ＋、Ｒｔ’によって該コンデンサＣＩがＶｃｃレ
ベルに充電される。一方、該信号電圧がリップル分を含
むことにより、該充電直後において該コンデンサＣ１に
充電された電荷が抵抗Ｒ、Ｉおよび抵抗Ｒ１’を通して
放電されることになる。In this way, when a predetermined signal voltage is generated when the fuse is cut, the signal voltage causes the diode D! and the transistor T that makes up the photocoupler! and the next stage transistor T are turned on in sequence, and the transistor T and the resistance R
,/and capacitor C3, the capacitor CI is charged to the Vcc level by a predetermined time constant C+, Rt'. On the other hand, since the signal voltage includes a ripple component, the electric charge charged in the capacitor C1 immediately after the charging is discharged through the resistors R, I and the resistor R1'.
この場合、該抵抗Ｒ１’の抵抗値を該抵抗Ｒ、１の抵抗
値より大きくすることにより該コンデンサＣＩを充電す
る時間を、該コンデンサＣ３が放電される時間より充分
短かくすることによって、ヒユーズ切断時に現れる該信
号電圧のリップル分を除去してこれを直流レベルとし、
その出力側に接続された検知回路（例えば所定の論理回
路）によって該ヒユーズの切断を所定のタイミングで検
知するようにされる。なお第２図中、Ｒ１、Ｒ１１は抵
抗、Ｉｔ はインバータを示している。In this case, by making the resistance value of the resistor R1' larger than the resistance value of the resistor R,1, the time for charging the capacitor CI is made sufficiently shorter than the time for discharging the capacitor C3, thereby eliminating the fuse. Remove the ripple component of the signal voltage that appears at the time of disconnection and make it a DC level,
A detection circuit (for example, a predetermined logic circuit) connected to the output side detects disconnection of the fuse at a predetermined timing. In FIG. 2, R1 and R11 represent resistors, and It represents an inverter.
上述したようにヒユーズ切断時に現れる信号電圧のリッ
プル分を除去するには、該コンデンサの充電時における
時定数（Ｒ２′によって決る）を、該コンデンサの放電
時における時定数（Ｒ，″とＲ、ｌとの和によって決る
）より充分小さくする必要があり、そのためには抵抗Ｒ
１’の抵抗値を抵抗Ｒ２′の抵抗値より充分大きくとる
（すなわち上記各時定数のアンバランスを充分大きくす
る）必要が生ずる。As mentioned above, in order to remove the ripple component of the signal voltage that appears when the fuse is blown, the time constant when charging the capacitor (determined by R2') is changed from the time constant when discharging the capacitor (R,'' and R, It is necessary to make the resistance sufficiently smaller than that determined by the sum of
It becomes necessary to make the resistance value of resistor R2' sufficiently larger than the resistance value of resistor R2' (that is, to make the unbalance of each of the above-mentioned time constants sufficiently large).
しかしながら、該トランジスタＴ１のドライブ能力の制
約上、該抵抗Ｒ，ｌの抵抗値をあまり小さくすることは
できず、一方、該抵抗Ｒ８′の抵抗値をあまり大きくす
ると、該トランジスタＴ、のリーク電流によって上記ヒ
ユーズＦが切断されていない（入力信号電圧が無い）に
も拘らず、該抵抗ＲＩ′の両端に所定の電圧を生ずるこ
とになり、これによって該ヒユーズが切断されたものと
誤って切断されるおそれを生じ、したがって該抵抗Ｒ１
’の抵抗値を大きくすることにも限界を生ずることにな
る。However, due to constraints on the drive ability of the transistor T1, the resistance values of the resistors R and l cannot be made very small.On the other hand, if the resistance value of the resistor R8' is made too large, a leakage current of the transistor T As a result, even though the fuse F is not blown (there is no input signal voltage), a predetermined voltage is generated across the resistor RI', which causes the fuse to be mistakenly thought to be blown. Therefore, the resistance R1
There is also a limit to increasing the resistance value of '.
このように上記従来回路においては、上記充電時および
放電時の各時定数のアンバランスを極端に大きくするこ
とができず、そのため充分なリップル除去を行うことが
できないという問題点があった。As described above, the conventional circuit has a problem in that the imbalance between the time constants during charging and discharging cannot be made extremely large, and therefore ripples cannot be removed sufficiently.
（問題点を解決するための手段〕
本発明は、かかる問題点を解決するためになされたもの
で、リップル分を含んだ信号電圧がトランジスタを介し
て入力され、該信号電圧を直流レベルとして出力するリ
ップル除去回路であって、第１の抵抗Ｒ１、第２の抵抗
Ｒ１、第３の抵抗Ｒ１、ダイオードＤＩおよびコンデン
サＣ１をそなえ、該ダイオードＤＩ ％該第３の抵抗Ｒ
１および該コンデンサＣ１よりなる直列回路によって該
入力信号電圧の該コンデンサＣＩに対する充電回路が形
成され、更に該ダイオードＤＩと該第３の抵抗Ｒ１との
直列回路と並列に接続された該第２の抵抗Ｒ２および該
第２の抵抗と直列接続された該第１の抵抗Ｒ，によって
該コンデンサＣ１に対する放電回路が形成されるように
したリップル除去回路が提供される。(Means for Solving the Problems) The present invention has been made to solve these problems, in which a signal voltage including a ripple component is input through a transistor, and the signal voltage is output as a DC level. The ripple removal circuit includes a first resistor R1, a second resistor R1, a third resistor R1, a diode DI, and a capacitor C1, and the third resistor R
A charging circuit for the capacitor CI of the input signal voltage is formed by a series circuit consisting of the diode DI and the third resistor R1. A ripple removal circuit is provided in which a discharge circuit for the capacitor C1 is formed by a resistor R2 and the first resistor R connected in series with the second resistor.
上記構成によれば、該コンデンサＣ１の充電時の時定数
は該抵抗Ｒ１の抵抗値によって決り、一方、放電時の時
定数は該抵抗Ｒ１とＲ２との抵抗値の和によって決るた
め、該抵抗Ｒ１の抵抗値をそれ程太き（しなくても、該
充電時と放電時の各時定数のアンバランスを容易に太き
（することができ、入力信号電圧が無いときのトランジ
スタのリーク電流などにもとづく誤動作のおそれなく、
充分なリップル除去を行うことができる。According to the above configuration, the time constant when charging the capacitor C1 is determined by the resistance value of the resistor R1, and the time constant when discharging the capacitor C1 is determined by the sum of the resistance values of the resistors R1 and R2. Even if the resistance value of R1 is not made that large, it is possible to easily increase the unbalance of each time constant during charging and discharging, and the leakage current of the transistor when there is no input signal voltage etc. without the risk of malfunction based on
Sufficient ripple removal can be performed.
第１図は本発明の１実施例としてのリップル除去回路を
示すもので、Ｒ３乃至Ｒ３はそれぞれ第１乃至第３の抵
抗、Ｄ、はダイオードを示している。FIG. 1 shows a ripple removal circuit as an embodiment of the present invention, where R3 to R3 are first to third resistors, respectively, and D is a diode.
該第１図の回路においてヒユーズＦの切断時には上述し
たようにトランジスタＴ２およびＴ、が順次オンとなり
、該トランジスタＴ、・ダイオードＤ１および第３の抵
抗Ｒ１を通してコンデンサＣ１がＶｃｃレベルに充電さ
れる。なお抵抗Ｒ３は電流制限用の抵抗である。一方、
該コンデンサＣ１の放電回路は該充電回路用のダイオー
ドＤ１および抵抗Ｒ５と並列に接続された第２の抵抗Ｒ
２および該第１の抵抗Ｒ１によって形成される。In the circuit of FIG. 1, when fuse F is disconnected, transistors T2 and T are turned on in sequence as described above, and capacitor C1 is charged to the Vcc level through transistor T, diode D1, and third resistor R1. Note that the resistor R3 is a current limiting resistor. on the other hand,
The discharging circuit of the capacitor C1 includes a second resistor R connected in parallel with the diode D1 and the resistor R5 for the charging circuit.
2 and the first resistor R1.
したがって充電回路の時定数（抵抗Ｒ５によって決る）
を、放電回路の時定数（抵抗Ｒ１とＲ２との和によって
決る）より十分小さくするためには、抵抗Ｒ１の抵抗値
に比して抵抗Ｒ１の抵抗値と抵抗Ｒ８の抵抗値との和を
十分に大きくとればよく、したがって抵抗Ｒ２の抵抗値
を所定の高抵抗値とすることによって、抵抗Ｒ１の抵抗
値をそれ程大きな値とする必要がなくなる。すなわち、
抵抗Ｒ３の抵抗値を特に大きくしなくても、抵抗Ｒ８の
抵抗値を所定の高抵抗値とすることによって上記充電回
路の時定数と放電回路の時定数とのアンバランスを大き
くし、入力信号電圧の無いときのトランジスタのリーク
電流などにもとづく誤動作のおそれなく、充分なリップ
ル除去を行うことができる。Therefore the time constant of the charging circuit (determined by resistor R5)
In order to make it sufficiently smaller than the time constant of the discharge circuit (determined by the sum of resistors R1 and R2), the sum of the resistance values of resistor R1 and resistor R8 should be made smaller than the resistance value of resistor R1. It is sufficient to set the resistance value to be sufficiently large. Therefore, by setting the resistance value of the resistor R2 to a predetermined high resistance value, it is not necessary to set the resistance value of the resistor R1 to such a large value. That is,
Even if the resistance value of the resistor R3 is not particularly increased, by setting the resistance value of the resistor R8 to a predetermined high resistance value, the unbalance between the time constant of the charging circuit and the time constant of the discharging circuit is increased, and the input signal It is possible to sufficiently remove ripples without fear of malfunction due to leakage current of the transistor when there is no voltage.
本発明によれば、入力信号電圧の無いときにトランジス
タのリーク電流などにもとづく誤動作を起すおそれがな
く、入力信号電圧に含まれるリップル除去を充分に行う
ことができ、ヒユーズ切断の有無などを正確に検知する
ことができる。According to the present invention, there is no risk of malfunction due to transistor leakage current when there is no input signal voltage, and ripples included in the input signal voltage can be sufficiently removed, and it is possible to accurately determine whether or not a fuse is blown. can be detected.
第１図は、本発明の１実施例としてのリップル除去回路
を示す図、
第２図は、従来技術におけるリップル除去回路を例示す
る図である。
（符号の説明）
Ｔ＋、Ｔｇ：）ランジスタ
Ｄ＋ 、Ｄｔ ：ダイオード
Ｒｒ 、 Ｒｓ ：抵抗
ＣＩ ＝コンデンサ
Ｆ ：ヒューズFIG. 1 is a diagram showing a ripple removal circuit as an embodiment of the present invention, and FIG. 2 is a diagram illustrating a ripple removal circuit in the prior art. (Explanation of symbols) T+, Tg:) Transistor D+, Dt: Diode Rr, Rs: Resistor CI = Capacitor F: Fuse
Claims (1)
を介して入力され、該信号電圧を直流レベルとして出力
するリップル除去回路であって、第１の抵抗Ｒ＿１、第
２の抵抗Ｒ＿２、第３の抵抗Ｒ＿３、ダイオードＤ＿１
およびコンデンサＣ＿１をそなえ、該ダイオードＤ＿１
、該第３の抵抗Ｒ＿３および該コンデンサＣ＿１よりな
る直列回路によって該入力信号電圧の該コンデンサＣ＿
１に対する充電回路が形成され、更に該ダイオードＤ＿
１と該第３の抵抗Ｒ＿３との直列回路と並列に接続され
た該第２の抵抗Ｒ＿２および該第２の抵抗と直列接続さ
れた該第１の抵抗Ｒ＿１によって該コンデンサＣ＿１に
対する放電回路が形成されることを特徴とするリップル
除去回路。1. The signal voltage including the ripple is applied to the transistor T_1.
A ripple removal circuit that outputs the signal voltage as a DC level, which includes a first resistor R_1, a second resistor R_2, a third resistor R_3, and a diode D_1.
and a capacitor C_1, and the diode D_1
, the input signal voltage is connected to the capacitor C_ by a series circuit consisting of the third resistor R_3 and the capacitor C_1.
A charging circuit for the diode D_
A discharge circuit for the capacitor C_1 is formed by the second resistor R_2 connected in parallel with the series circuit of 1 and the third resistor R_3 and the first resistor R_1 connected in series with the second resistor. A ripple removal circuit characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62140755A JPS63305720A (en) | 1987-06-06 | 1987-06-06 | Ripple removing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62140755A JPS63305720A (en) | 1987-06-06 | 1987-06-06 | Ripple removing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63305720A true JPS63305720A (en) | 1988-12-13 |
Family
ID=15275983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62140755A Pending JPS63305720A (en) | 1987-06-06 | 1987-06-06 | Ripple removing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63305720A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993021495A1 (en) * | 1992-04-16 | 1993-10-28 | Kabushiki Kaisha Ace Denken | Metal detector for locating metallic body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515123A (en) * | 1978-07-18 | 1980-02-02 | Toshiba Corp | Light signal receiver |
| JPS602347B2 (en) * | 1982-04-15 | 1985-01-21 | 大阪瓦斯株式会社 | Coke cooling equipment |
-
1987
- 1987-06-06 JP JP62140755A patent/JPS63305720A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515123A (en) * | 1978-07-18 | 1980-02-02 | Toshiba Corp | Light signal receiver |
| JPS602347B2 (en) * | 1982-04-15 | 1985-01-21 | 大阪瓦斯株式会社 | Coke cooling equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993021495A1 (en) * | 1992-04-16 | 1993-10-28 | Kabushiki Kaisha Ace Denken | Metal detector for locating metallic body |
| US5611534A (en) * | 1992-04-16 | 1997-03-18 | Kabushiki Kaisha Ace Denken | Metal substance detection system for detecting the presence position of a metal substance |
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