JPS6312264B2 - - Google Patents
Info
- Publication number
- JPS6312264B2 JPS6312264B2 JP54110015A JP11001579A JPS6312264B2 JP S6312264 B2 JPS6312264 B2 JP S6312264B2 JP 54110015 A JP54110015 A JP 54110015A JP 11001579 A JP11001579 A JP 11001579A JP S6312264 B2 JPS6312264 B2 JP S6312264B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- power supply
- resistor
- overcurrent detection
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
【発明の詳細な説明】
本発明は、回路の短絡事故等に基づいた過電流
を検出する新規方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for detecting overcurrents based on short circuit accidents and the like.
第１図は周知電源回路の原理構成図を示すもの
で、入力端子１に供給されるAC電源はまず整流
回路２で整流されて半導体スイツチング素子から
成るインバータ３に供給され、該インバータ３を
制御回路４で駆動してこの直流電圧をパルス状の
交流電圧に変換すると共に、該交流電圧をトラン
ス５の２次側に伝達し、再び直流回路６で直流電
圧に変換して出力端子７に出力する。一方、この
出力電圧は制御回路４内において基準電圧と比較
され、誤差発生時に該制御回路４がインバータ３
を誤差電圧が所定の値以下となるように駆動す
る。このような電源回路ではトランス５の２次側
に過電流検出回路が装備されるのが一般的であ
り、そのため従来では第３図のようにトランス５
の２次側ライン中に抵抗８を挿入し、この抵抗８
の両端電圧をトランジスタ９に印加するように構
成し、短絡事故発生によつて上記抵抗８に過電流
が流れる場合に該抵抗８の両端電圧上昇に伴つて
トランジスタ９をオンし、制御回路４又はインバ
ータ３に過電流検出信号を入力し、インバータ３
のスイツチング動作を停止するようにしている。
しかし、かかる過電流検出回路ではトランジスタ
９の駆動用としてトランス２次側に抵抗８を挿入
して構成しているから、この抵抗８を例えば0.1
Ωとしても流れる電流が6Aあれば3.6Wという極
めて高い電力損失が常時発生し、この電源回路の
電力効率が悪いものになる。又抵抗８は上記電力
消費にたえるだけの容量の大きいものを使用しな
ければならずコスト的に高いものになる、等の欠
点を有することになつていた。 FIG. 1 shows the basic configuration diagram of a well-known power supply circuit. AC power supplied to an input terminal 1 is first rectified by a rectifier circuit 2 and supplied to an inverter 3 made of semiconductor switching elements, which controls the inverter 3. It is driven by a circuit 4 to convert this DC voltage into a pulsed AC voltage, transmits the AC voltage to the secondary side of a transformer 5, converts it back to DC voltage by a DC circuit 6, and outputs it to an output terminal 7. do. On the other hand, this output voltage is compared with a reference voltage in the control circuit 4, and when an error occurs, the control circuit 4
is driven such that the error voltage is below a predetermined value. In such a power supply circuit, an overcurrent detection circuit is generally installed on the secondary side of the transformer 5. Therefore, conventionally, the transformer 5 is equipped with an overcurrent detection circuit as shown in FIG.
A resistor 8 is inserted into the secondary line of the
is configured to apply a voltage across the transistor 9 to the transistor 9, and when an overcurrent flows through the resistor 8 due to a short-circuit accident, the transistor 9 is turned on as the voltage across the resistor 8 increases, and the control circuit 4 or Input the overcurrent detection signal to inverter 3,
The switching operation is stopped.
However, since such an overcurrent detection circuit is constructed by inserting a resistor 8 on the secondary side of the transformer for driving the transistor 9, this resistor 8 is, for example, 0.1
Even if the current flows through 6A, an extremely high power loss of 3.6W will occur constantly, making this power supply circuit inefficient. Further, the resistor 8 has to have a large capacity enough to withstand the above-mentioned power consumption, resulting in high cost.
本発明はかかる点に鑑みて成されたもので、そ
の一実施例を第２図に基づき説明すると、第１図
に示す電源回路をプリント基板に配線して構成す
るにあたり、該回路のトランス２次側において電
源回路のプリントライン１０を利用し、このプリ
ントライン１０の所要範囲２点ａ，ｂから該範囲
ａ，ｂ間のライン抵抗によつて生じる微小電圧を
取出すようにし、この微小電圧を差動増幅器１１
に入力して電圧増幅させ、しかして第１図回路が
正常に動作して上記ａ，ｂ間の取出し電圧が微小
電圧範囲にとどまる時は差動増幅器１１が出力せ
ず、第１図回路に短絡事故等が生じて上記ａ，ｂ
間の取出し電圧が所要値以上になる時に差動増幅
器１１が出力して、この出力が制御回路４もしく
はインバータ３に過電流検出信号として入力され
るようにする。 The present invention has been made in view of these points, and one embodiment thereof will be explained based on FIG. 2. When configuring the power supply circuit shown in FIG. On the next side, the printed line 10 of the power supply circuit is used to extract the minute voltage generated by the line resistance between the ranges a and b from two points a and b in the required range of the printed line 10, and this minute voltage is Differential amplifier 11
When the circuit in FIG. 1 operates normally and the output voltage between a and b remains within the micro voltage range, the differential amplifier 11 does not output, and the circuit in FIG. If a short circuit accident occurs, the above a and b
The differential amplifier 11 outputs an output when the voltage taken out between them exceeds a required value, and this output is inputted to the control circuit 4 or the inverter 3 as an overcurrent detection signal.
このように本発明は電源回路のプリントライン
１０を利用し、該プリントライン１０のライン抵
抗によつて生じる微小電圧を取出し且つ増幅して
過電流の有無を判定するようにしたものであるか
ら、従来のような電圧取出し用の抵抗をトランス
２次側に介在させる必要がなくなり、それだけ回
路構成が簡略化されると共に、低コストに上記電
源回路が構成される。又、従来のように抵抗を利
用して電圧を取出すものではなく、プリントライ
ンのライン抵抗によつて生じる微小電圧を取出す
ものであるから、過電流検出回路部分における大
きな電力損失がなく、故に電源回路の電力効率向
上に益する。 As described above, the present invention utilizes the printed line 10 of the power supply circuit, extracts and amplifies the minute voltage generated by the line resistance of the printed line 10, and determines whether there is an overcurrent. There is no need to interpose a resistor for voltage extraction on the secondary side of the transformer as in the conventional case, and the circuit configuration is simplified accordingly, and the power supply circuit is configured at low cost. In addition, since the voltage is not extracted using a resistor as in the past, but the minute voltage generated by the line resistance of the printed line is extracted, there is no large power loss in the overcurrent detection circuit, and therefore the power supply It helps improve the power efficiency of the circuit.
第１図は電源回路の基本構成を示すブロツク
図、第２図は本発明の一実施例を示す図、第３図
は従来の過電流検出方法を示す図である。
１０……プリントライン、１１……増幅器。
FIG. 1 is a block diagram showing the basic configuration of a power supply circuit, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional overcurrent detection method. 10...print line, 11...amplifier.
Claims (1)
するものにおいて、プリントラインの所要範囲２
点から該範囲間のライン抵抗によつて生じる微小
電圧を取出し、且つこれを電圧増幅して過電流の
有無を判定することを特徴とする過電流検出方
法。1 In the case where the required electric circuit is wired to a printed circuit board, the required range of the printed line 2
An overcurrent detection method characterized by extracting a minute voltage generated by a line resistance between a point and the range, and amplifying the voltage to determine the presence or absence of an overcurrent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11001579A JPS5633558A (en) | 1979-08-28 | 1979-08-28 | Detecting method for overcurrent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11001579A JPS5633558A (en) | 1979-08-28 | 1979-08-28 | Detecting method for overcurrent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5633558A JPS5633558A (en) | 1981-04-04 |
| JPS6312264B2 true JPS6312264B2 (en) | 1988-03-18 |
Family
ID=14524953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11001579A Granted JPS5633558A (en) | 1979-08-28 | 1979-08-28 | Detecting method for overcurrent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5633558A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH033078U (en) * | 1989-05-26 | 1991-01-14 | ||
| JPH0321188U (en) * | 1989-07-05 | 1991-03-01 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713607A (en) * | 1985-12-23 | 1987-12-15 | Tektronix, Inc. | Current sensing circuit |
-
1979
- 1979-08-28 JP JP11001579A patent/JPS5633558A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH033078U (en) * | 1989-05-26 | 1991-01-14 | ||
| JPH0321188U (en) * | 1989-07-05 | 1991-03-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5633558A (en) | 1981-04-04 |
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