JPS6020729A - Power source protecting circuit - Google Patents
Power source protecting circuitInfo
- Publication number
- JPS6020729A JPS6020729A JP58126984A JP12698483A JPS6020729A JP S6020729 A JPS6020729 A JP S6020729A JP 58126984 A JP58126984 A JP 58126984A JP 12698483 A JP12698483 A JP 12698483A JP S6020729 A JPS6020729 A JP S6020729A
- Authority
- JP
- Japan
- Prior art keywords
- limiting resistor
- current limiting
- power supply
- inrush current
- circuit
- 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
- 238000009499 grossing Methods 0.000 claims description 9
- 230000005856 abnormality Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
発明の属する技術分野
本発明は、電源装置保護回路に関し、特に突入電流制限
抵抗を備えて電源投入時の突入電流を制限し、定常運転
中は該突入電流制限抵抗をリレー接点で短絡しているよ
うな電源装置の前記リレー接点不良による前記突入電流
制限抵抗の焼損等を防止するための保護回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply protection circuit, and in particular to a power supply protection circuit that is provided with an inrush current limiting resistor to limit the inrush current when the power is turned on, and that the inrush current limiting resistor is limited during steady operation. The present invention relates to a protection circuit for preventing burnout of the inrush current limiting resistor due to a faulty relay contact of a power supply device in which a short circuit occurs at a relay contact.
従来技術
従来、突入電流制限抵抗によって突入電流を制限し、定
常運転蒔には前記突入電流制限抵抗をリレー接点によっ
て短絡しているような電源回路において、何等かの異常
によって前記リレー接点が開路された場合に、前記突入
電流制限抵抗が定格電力を大幅に超える電力消費によっ
て焼損することを防止するために、温度検出素子を前記
突入電流制限抵抗の表面に付加して、該温度検出素子が
一定以上の温度を検出したとき電源を切断するようにし
ている。しかし、このような温度検出素子にキる従来の
保護回路は、前記突入電流制限抵抗の表面温度を完全に
検出することが困難であシ、また応答の遅れがあるとい
う欠点がある。Prior Art Conventionally, in a power supply circuit in which inrush current is limited by an inrush current limiting resistor, and the inrush current limiting resistor is short-circuited by a relay contact during steady operation, the relay contact is opened due to some abnormality. In order to prevent the inrush current limiting resistor from burning out due to power consumption that greatly exceeds the rated power when the inrush current limiting resistor The power is cut off when a temperature above this level is detected. However, conventional protection circuits based on such temperature detection elements have drawbacks in that it is difficult to completely detect the surface temperature of the inrush current limiting resistor, and there is a delay in response.
発明の目的
本発明の目的は、上述の従来の欠点を解決し、突入電流
制限抵抗に定格電力を超える電圧が印加された異常時に
直ちに電源を切断できるようにした電源装置保護回路を
提供することにある。OBJECTS OF THE INVENTION It is an object of the present invention to provide a power supply protection circuit that solves the above-mentioned conventional drawbacks and is capable of immediately cutting off the power supply in the event of an abnormality in which a voltage exceeding the rated power is applied to the inrush current limiting resistor. It is in.
発明の構成
電源整流平滑回路と、該電源整流平滑回路に直列に挿入
された突入電流制限抵抗と、定常運転中は前記突入電流
制限抵抗を短絡するリレー接点とを備えた電源装置にお
いて、前記突入電流制限抵抗の両端の電圧を検出したと
き導通するスイッチング素子と、該スイッチング素子が
導通すると前記電源整流平滑回路の入力を遮断する制御
回路とを備え／こことを特徴とする。Structure of the Invention In a power supply device comprising a power supply rectifying and smoothing circuit, an inrush current limiting resistor inserted in series with the power supply rectifying and smoothing circuit, and a relay contact that short-circuits the inrush current limiting resistor during steady operation, the inrush The present invention is characterized by comprising a switching element that becomes conductive when a voltage across the current limiting resistor is detected, and a control circuit that cuts off input to the power rectifying and smoothing circuit when the switching element becomes conductive.
発明の実施例
次に、本発明について、図面を参照して詳細に説明する
。Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.
図は、本発明の一実施例を示す回路図である。The figure is a circuit diagram showing one embodiment of the present invention.
すなわち、交流電源１は、リレー接点５を閉成すると整
流素子２に印加される。整流素子２の出力する直流出力
は、チョークコイル３および大容量コンデン−ｙ′４か
らなる平滑回路を通して負荷に供給される。電流投入時
に、大容量コンデンサ４の充電電流等によって大きな突
入電流が流れることを防止するために、前記平滑回路に
直列に突入電流制限抵抗７が挿入されている。突入電流
制限抵抗７には、リレー接点６が並列に接続されていて
、リレー接点６は電流投入時にはオフされ、電源投入後
定常状態となった後にオンするように制御回路１２によ
って制御される。従って、定常運転中はリレー接点６に
よって突入電流制限抵抗７が短絡され、該抵抗による電
圧降下および電力消費はない○上述の突入電流制限手段
は公知の従来回路と同じである。しかし、本実施例にお
いては、トランジスタ９のエミッタを突入電流制限抵抗
７の一端に接続し、ベースは抵抗８を介して突入電流制
限抵抗７の他端に接続している。トランジスタ９は、突
入電流制限抵抗７の両端の電圧を検出したとき万ンする
スイッチング素子を構成している。That is, the AC power source 1 is applied to the rectifying element 2 when the relay contact 5 is closed. The DC output from the rectifying element 2 is supplied to the load through a smoothing circuit consisting of a choke coil 3 and a large-capacity capacitor y'4. An inrush current limiting resistor 7 is inserted in series with the smoothing circuit in order to prevent a large inrush current from flowing due to the charging current of the large capacitor 4 when current is applied. A relay contact 6 is connected in parallel to the inrush current limiting resistor 7, and the relay contact 6 is controlled by a control circuit 12 so as to be turned off when current is applied, and turned on after the power is turned on and a steady state is reached. Therefore, during steady operation, the inrush current limiting resistor 7 is short-circuited by the relay contact 6, and there is no voltage drop or power consumption due to the resistor. The above-mentioned inrush current limiting means is the same as the known conventional circuit. However, in this embodiment, the emitter of the transistor 9 is connected to one end of the inrush current limiting resistor 7, and the base is connected to the other end of the inrush current limiting resistor 7 via the resistor 8. The transistor 9 constitutes a switching element that turns on when the voltage across the rush current limiting resistor 7 is detected.
ソシて、トランジスタ９のコレクタは、抵抗１１とフォ
トカプラ１０を介して突入電流制限抵抗７の接続されて
いない方の出力端子に接続されている。トランジスタ９
が導通するとフォトカブ２１０が導通して、異常信号を
制御回路１２へ送出する。The collector of the transistor 9 is connected to the unconnected output terminal of the inrush current limiting resistor 7 via a resistor 11 and a photocoupler 10. transistor 9
When conductive, the photocube 210 becomes conductive and sends an abnormal signal to the control circuit 12.
制御回路１２は、該異常信号によシ、リレー接点５を開
路して電源を切断する。すなわち、本実施例は、定常運
転中に、何等かの異常によってリレー接点６が開いたと
きは、突入電流制限抵抗７の両端の電圧が上昇し、トラ
ンジスタ９が導通し、フォトカプラｌＯから異常信号が
制御回路１２に送られ、制御回路１２の制御によってリ
レー接点５を開いて電源入力を切断する。従って、突入
電流制限抵抗７の焼損を防止することができる。なお、
フォトカプラ１０は、制御回路１２と電源回路とを電気
的に分離するためのものであし、本発明の必須の構成要
素ではない。In response to the abnormality signal, the control circuit 12 opens the relay contact 5 to cut off the power supply. That is, in this embodiment, when the relay contact 6 opens due to some abnormality during steady operation, the voltage across the inrush current limiting resistor 7 increases, the transistor 9 becomes conductive, and the abnormality is detected from the photocoupler lO. A signal is sent to the control circuit 12, and under the control of the control circuit 12, the relay contact 5 is opened to cut off the power input. Therefore, burning out of the rush current limiting resistor 7 can be prevented. In addition,
The photocoupler 10 is for electrically separating the control circuit 12 and the power supply circuit, and is not an essential component of the present invention.
発明の効果
以上のように、本発明においては、突入電流制限抵抗の
両端の電圧を検出したとき電源入力を遮断するように構
成したから、突入電流制限抵抗の焼損を完全に防止する
ことができるという効果がある。Effects of the Invention As described above, in the present invention, since the power input is cut off when the voltage across the inrush current limiting resistor is detected, burnout of the inrush current limiting resistor can be completely prevented. There is an effect.
図は本発明の一実施例を示す回路図である。
図において、１・・・交流電源、２・・・整流素子、３
・・・チョークコイル、４・・・大容量コンデンサ、５
・・・リレー接点、６・・・リレー接点、７・・・突入
電流制限抵抗、８，１１・・・抵抗、９・・・トランジ
スタ、ｌＯ・・・フォトカプラ、１２・・・制御回路。
代理人 弁理士 住田俊宗The figure is a circuit diagram showing one embodiment of the present invention. In the figure, 1... AC power supply, 2... Rectifying element, 3
...Choke coil, 4...Large capacity capacitor, 5
...Relay contact, 6...Relay contact, 7...Inrush current limiting resistor, 8, 11...Resistor, 9...Transistor, lO...Photocoupler, 12...Control circuit. Agent Patent Attorney Toshimune Sumita
Claims (1)
に挿入された突入電流制限抵抗と、定常運転中は前記突
入電源制限抵抗を短絡するリレー接点とを備えた電源装
置において、前記突入電流制限抵抗の両端の電圧を検出
したとき導通するスイッチング素子と、該スイッチング
素子が導通すると前記電源整流平滑回路の入力を遮断す
る制御回路とを備えたことを特徴とする電源装置保護回
路。 （２、特許請求の範囲第１項記載の電源装置保護回路に
おいて、前記スイッチング素子は前記突入電流制限抵抗
の両端にエミッタおよびベースを接続したトランジスタ
で構成され、該トランジスタのコレクタと前記電源整流
平滑回路の前記突入電流制限抵抗が接続されていない方
の出力端子との間に接続された７オトカプラを備えて、
該フォトカブラの出力を前記制御回路に入力させるよう
に構成されたことを特徴とするもの。(1) In a power supply device comprising a power rectifying and smoothing circuit, an inrush current limiting resistor inserted in series with the power rectifying and smoothing circuit, and a relay contact that short-circuits the inrush power limiting resistor during steady operation, the inrush A power supply protection circuit comprising: a switching element that becomes conductive when a voltage across a current limiting resistor is detected; and a control circuit that cuts off input to the power supply rectifying and smoothing circuit when the switching element becomes conductive. (2. In the power supply protection circuit according to claim 1, the switching element is composed of a transistor whose emitter and base are connected to both ends of the inrush current limiting resistor, and the collector of the transistor and the power supply rectifying and smoothing 7 Oto coupler connected between the output terminal to which the inrush current limiting resistor of the circuit is not connected,
The device is characterized in that the output of the photocoupler is configured to be input to the control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58126984A JPS6020729A (en) | 1983-07-14 | 1983-07-14 | Power source protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58126984A JPS6020729A (en) | 1983-07-14 | 1983-07-14 | Power source protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6020729A true JPS6020729A (en) | 1985-02-02 |
Family
ID=14948767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58126984A Pending JPS6020729A (en) | 1983-07-14 | 1983-07-14 | Power source protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6020729A (en) |
-
1983
- 1983-07-14 JP JP58126984A patent/JPS6020729A/en active Pending
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