JPS5852709A - Overload protecting device for multioutput switching power source - Google Patents
Overload protecting device for multioutput switching power sourceInfo
- Publication number
- JPS5852709A JPS5852709A JP15158081A JP15158081A JPS5852709A JP S5852709 A JPS5852709 A JP S5852709A JP 15158081 A JP15158081 A JP 15158081A JP 15158081 A JP15158081 A JP 15158081A JP S5852709 A JPS5852709 A JP S5852709A
- Authority
- JP
- Japan
- Prior art keywords
- output
- switching
- overload
- collector current
- capacitor
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は多出力スイッチング電源の過負荷保護装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overload protection device for a multi-output switching power supply.
従来の多出力スイッチング電源の過負荷保護装置として
は第１図に示すように構成されていたＯＤＣ入力の一方
の端子１は変換トランス３の入力巻線Ｎ１の一端に、端
子２は過電流検出抵抗４を介してスイッチングトランジ
スタ５のエミ・ンタに接続され、このスイッチングトラ
ンジスタ６のコレクタは上記入力巻線Ｎ１の他出部に接
続さｈ５、ペースは駆動制御回路６に接続されていた０
さらに、上記エミッタも駆動制御回路６に接続されてい
る。まだ過電流検出抵抗４の両端も駆動制御回路６に接
続されていた。A conventional overload protection device for a multi-output switching power supply is configured as shown in Figure 1. One terminal 1 of the ODC input is connected to one end of the input winding N1 of the conversion transformer 3, and terminal 2 is connected to the overcurrent detection terminal. It is connected to the emitter and terminal of a switching transistor 5 through a resistor 4, the collector of this switching transistor 6 is connected to the other end of the input winding N1, and the pace is connected to the drive control circuit 6.
Further, the emitter is also connected to the drive control circuit 6. Both ends of the overcurrent detection resistor 4 were still connected to the drive control circuit 6.
上記変換トランス３のＮ２．Ｎ３は出力巻線でこの出力
巻線Ｎ２．Ｎ３には、それぞれ整流用ダイオード７．８
、−平滑用チョークコイル９、平滑用コンデンサ１ｏが
接続され、負荷１１．１２に接続されていた。N2 of the conversion transformer 3. N3 is an output winding, and this output winding N2. N3 has a rectifier diode 7.8
, - A smoothing choke coil 9 and a smoothing capacitor 1o were connected to the load 11.12.
上記一方の負荷１２の両端には出力電圧を取出し一度光
信号に変換し２、出力電圧に応じた信号を駆動制御回路
６に供給するフォトアイソレータ１３が接続されていた
。A photo-isolator 13 was connected to both ends of the one load 12, which takes out the output voltage, converts it once into an optical signal 2, and supplies a signal corresponding to the output voltage to the drive control circuit 6.
この構成ではスイ・ノチングトランジスタ５の駆σ山に
フォトアイソレータ１３としてトランスを几１いないた
め、スイッチングトランジスタ５の１駆動がより効率よ
く行なえ、コレクタ電流を検出しそのピーク値をほとん
ど時間遅れなく制限することが可能であり、この機能に
より電源投入時や異常時（電源出力の過渡的なオン・オ
フ）に対し１、スイッチングトランジスタ５のコレクタ
電流を十分制限できるので、比較的安全動作領域の狭い
トランジスタでも使用できるという利点があった。In this configuration, since there is no transformer as a photo-isolator 13 on the driving peak of the switching transistor 5, the switching transistor 5 can be driven more efficiently, and the collector current can be detected and its peak value can be detected with almost no time delay. This function makes it possible to sufficiently limit the collector current of the switching transistor 5 when the power is turned on or during an abnormality (transient on/off of the power supply output). It had the advantage that it could be used even with narrow transistors.
しかしながら、このコレクタ電流検出形の過電流保護装
置では、次のような欠点があった。However, this collector current detection type overcurrent protection device has the following drawbacks.
すなわち、単出力電源の場合は二次側の過負荷保護動作
の開始点を一次側に設けた過電流保護装置にて設定可能
であるが、複数出力の場合は全出力が全負荷の状態で各
出力の過負荷保護の開始点の設定をしなければならない
。この場合、ある出力の過負荷保護動作点が他の出力の
負荷の状態により変化する。゛これは一次側の入力電流
（スイッチングトランジスタ５のコレクタ電流のピーク
値と等価とみてよい）を検出しているため必然的に起こ
り、したがって負荷短絡の対策として他の全回路が無負
荷時のある回路の短絡電流（通常とれは定格の出力電流
値よりもかなり大きくなる）に兄合った出力回路素子、
すなわち、チョークコイノビ９、整流ダイオ−上゛７，
８を使用しなければならず、きわめて不経済なものであ
った。In other words, in the case of a single output power supply, the starting point of overload protection operation on the secondary side can be set using the overcurrent protection device installed on the primary side, but in the case of a multiple output power supply, the starting point of the overload protection operation on the secondary side can be set with the overcurrent protection device installed on the primary side, but in the case of a multiple output power supply, The starting point of overload protection for each output must be set. In this case, the overload protection operating point of a certain output changes depending on the load condition of the other output.゛This naturally occurs because the input current on the primary side (which can be considered equivalent to the peak value of the collector current of switching transistor 5) is detected, and therefore, as a countermeasure against load short circuits, all other circuits are Output circuit elements that match the short circuit current of a certain circuit (usually the current is much larger than the rated output current value),
That is, choke Koinobi 9, rectifier diode 7,
8 had to be used, which was extremely uneconomical.
本発明は以上のような従来の欠点を除去するものであり
、動作が確実で信頼性に富んだ多出力スイッチング電源
の過負荷保護装置を提供することを目的とするものであ
る。The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide an overload protection device for a multi-output switching power supply that operates reliably and is highly reliable.
すなわち、上記目的を達成するために本発明はスイッチ
ングトランジスタのコレクタ電流がある限界値を超メだ
とき、さらに過負荷を示すパルス信号を出し、これをコ
ンデンサと抵抗で構成される積分回路で受け、この積分
回路の出力が一定電圧に達すると、スイッチング動作を
停止させ、さらに一定時間後スイツチング動作を再び開
始するように構成したことを特徴とするものである。That is, in order to achieve the above object, the present invention further outputs a pulse signal indicating overload when the collector current of the switching transistor exceeds a certain limit value, and receives this pulse signal by an integrating circuit composed of a capacitor and a resistor. , when the output of the integrating circuit reaches a certain voltage, the switching operation is stopped, and the switching operation is restarted after a certain period of time.
以下、本発明の実施例を図面第２図により説明する。Embodiments of the present invention will be described below with reference to FIG. 2.
１４．１５はＤＣ入力端子で、一方のＤＣ入力端子１４
は変換トランス１６の入力巻線Ｎ１の一端に接続され、
他方のＤＣ入力端子１５は過電流検出抵抗１７を介し、
てスイッチングトランジスタ１８のエミッタに接続され
ている。このスイッチングトランジスタ１８のコレクタ
は上記入力巻線Ｎ１の他端に接続され、このスイッチン
グトランジスタ１８のベースは駆動制御回路１９に接続
されている。また、上記エミッタも、さらに過電流検出
抵抗１７の両端駆動制御回路１９に接続されている。14.15 are DC input terminals; one DC input terminal 14
is connected to one end of the input winding N1 of the conversion transformer 16,
The other DC input terminal 15 is connected via an overcurrent detection resistor 17,
and is connected to the emitter of the switching transistor 18. The collector of this switching transistor 18 is connected to the other end of the input winding N1, and the base of this switching transistor 18 is connected to a drive control circuit 19. Further, the emitter is also connected to the both-end drive control circuit 19 of the overcurrent detection resistor 17.
マタ、変換トランス１６の二次側には出力巻線Ｎ２．Ｎ
３が設けられ、この出力巻線Ｎ２ 、 Ｎ３には整流用
ダイオード２０．１１平滑用チヨークコイル２２、平滑
用コンデンサ２３の回路を介して負荷２４．２５が接続
されている。The secondary side of the conversion transformer 16 has an output winding N2. N
A load 24.25 is connected to the output windings N2 and N3 through a circuit including a rectifying diode 20.11, a smoothing coil 22, and a smoothing capacitor 23.
この一方の負荷２６の両端には、出力電圧を取出し、一
度光信号に変換し、再び出力電圧に応じた信号を駆動制
御回路１９に供給するフォトアイソレータ２６が接続さ
ｈている。A photo-isolator 26 is connected to both ends of this one load 26, which takes out the output voltage, converts it once into an optical signal, and again supplies a signal corresponding to the output voltage to the drive control circuit 19.
上記駆動制御回路１９の００Ｍ端子には出力トランジス
タ２７のエミッタが接続され、この出力トランジスタ２
７のコレクタは駆動制御回路１９のＳＤ端子に接続され
、ベースはベース抵抗２８を介して夕・［マーＩＣによ
るマルチバイブレータ２９に接続されている。この１駆
動制御回路１９のＯＣＬ端子には抵抗３０、コンデンサ
３１の積分回路が接続され、このコンデンサ３１には並
列に放電抵抗３２が接続され、上記抵抗３ｏとコンデン
サ３１の接続点にはリセット解除用トランジスタ３３（
７）−＜−スが接続され、とのりセソ）解除用トランジ
スタ３３のエミッタにはリセット解除用抵抗３４が接続
されるとともにマルチバイブレータ２９に接続されてお
り、コレクタは駆動制御回路１９のＶＣＣ端子に接続さ
れ、この■ｃｃ端子にはタイマ一定数回路としての抵抗
３５．３６、コンデンサ３了が接続され、抵抗３５．３
６の接続点、抵抗３６とコンデンサ３７の接続点はマル
チバイブレータ２９に接続され、コンデンサ３７はＣｏ
Ｍ端子に接続されている。さらにＣｏＭ端子とマルチバ
イブレータ２９間にはノイズ防止用コンデンサ３８が接
続され、出力トランジスタ２７のベース、エミッタ間に
６寸抵抗３９か接続さノ）、でいる。The emitter of an output transistor 27 is connected to the 00M terminal of the drive control circuit 19.
The collector of 7 is connected to the SD terminal of the drive control circuit 19, and the base is connected via a base resistor 28 to a multivibrator 29 formed by an IC. An integrating circuit consisting of a resistor 30 and a capacitor 31 is connected to the OCL terminal of this 1 drive control circuit 19, a discharge resistor 32 is connected in parallel to this capacitor 31, and the connection point between the resistor 3o and the capacitor 31 is used to release reset. transistor 33 (
7) - A resistor 35.36 and a capacitor 3 as a timer constant number circuit are connected to this CC terminal.
The connection point of 6 and the connection point of resistor 36 and capacitor 37 are connected to multivibrator 29, and capacitor 37 is connected to Co
Connected to the M terminal. Further, a noise prevention capacitor 38 is connected between the CoM terminal and the multivibrator 29, and a 6-inch resistor 39 is connected between the base and emitter of the output transistor 27.
上記構成で過電流検出抵抗１７によりスイッチングトラ
ンジスタ１８のコレクタ電流をスイッチングのサイクル
毎に検出し、制限レベルを超えるとスイッチングトラン
ジスタ１８を遮断し、コレクタ電流を制限する。同時に
駆動制御回路１９から開始信号を出しく○ＣＬ端子の出
力がハイレベルとなる）、抵抗３０、コンデンサ３１で
決定さｆｒ、る時間後リセット解除用トランジスタ３３
がＯＮし マルチバイブレータ２９のｔ）七ノドが解除
され無安定動作を開始する。これにより出力トランジス
タ２７が０Ｎ１ＯＦＦし、駆動用制御回路１９もＯＮ、
ＯＦＦする。過負荷状態が取除かれるとマルチバイブレ
ータ２９はリセットされ電源出力は正常に戻る。With the above configuration, the overcurrent detection resistor 17 detects the collector current of the switching transistor 18 every switching cycle, and when it exceeds a limit level, the switching transistor 18 is cut off and the collector current is limited. At the same time, a start signal is output from the drive control circuit 19 (the output of the CL terminal becomes high level), and after a period of time determined by the resistor 30 and capacitor 31, the reset release transistor 33
is turned ON, the t) seventh node of the multivibrator 29 is released, and unstable operation starts. As a result, the output transistor 27 is turned off, and the drive control circuit 19 is also turned on.
Turn off. When the overload condition is removed, the multivibrator 29 is reset and the power output returns to normal.
以上のように本発明の多出力スイッチング電源の過負荷
保護装置は、ある出力が過負荷になり「次側の駆動制御
回路が動作しスイッチングトランジスタのコレクタ電流
が制限されると同時にタイマーを起動させ一定時間後ス
イツチングを停止しさらにタイマーにより一定時間後ス
イッチング動作を復帰させるようにしたため、過負荷時
には過負荷の状態が取除かれるまで出力がＯＮ、ＯＦＦ
を繰返す。このＯＮ 、 Ｏ’Ｆ Ｆの比を適切な値、
たとえば昂に設定すれば出力巻線の平滑用チョークコイ
ルや整流用ダイオードが定格に見合った小さなものでも
短絡、過負荷時に破壊することはない。As described above, the overload protection device for a multi-output switching power supply of the present invention is capable of starting a timer at the same time that when a certain output becomes overloaded, the next drive control circuit operates and the collector current of the switching transistor is limited. Switching is stopped after a certain period of time, and a timer is used to restart the switching operation after a certain period of time, so in the event of an overload, the output is turned ON and OFF until the overload condition is removed.
Repeat. Set the ratio of ON and O'FF to an appropriate value,
For example, if the setting is set to "high", even if the output winding's smoothing choke coil and rectifier diode are small enough to meet their ratings, they will not be destroyed in the event of a short circuit or overload.
１だある出力の過負荷保護動作点が他の出力の負荷の状
態により変化することは妨げず、実用上では過負荷状態
は短絡や急激な過負荷がほとんどであるため十分な過負
荷保護の目的が達成できる。1. It does not prevent the overload protection operating point of one output from changing depending on the load condition of other outputs, and in practice, overload conditions are almost always caused by short circuits or sudden overloads, so it is necessary to provide sufficient overload protection. The purpose can be achieved.
さらに過負荷を検出してから遮断にいたるまで時定数を
もだせているため、パルス状の負荷電流やノイズにより
誤動作を起すこともない。Furthermore, since there is a time constant from when an overload is detected to when the circuit is shut off, malfunctions do not occur due to pulsed load current or noise.
また、この構成はサーボモータ用電源の過負荷保護とし
て有効である。Furthermore, this configuration is effective as overload protection for the servo motor power supply.
第１図は従来の多出力スイッチング電源の過負荷保護装
置の電気的回路図、第２図は本発明の多出力スイッチン
グ電源の過負荷保護装置の一実施例を示す電気的回路図
である。
１４．１５・・・・・・ＤＣ入力端子、１６・・・・・
・変換トランス、１７・・・・・・過電流検出抵抗、１
８・−・・・・スイッチングトランジスタ、１９・・・
・・・駆動制御回路、２０．２１ ・・・・・・整流用
ダイオード、２２・・・・・・平滑用チョークコイル、
２３・・・・・・牢−滑川コンデンサ、２４．２６・・
・・・・負荷、２６°。
・・・・フォトアインレータ、２７・・・・・・出力ト
ランジスタ、２８・・・・・・ベース抵抗、２９・・・
・・・タイマーＩＣのマルチバイブレータ、３ｏ・・・
・・・抵抗、３１・・・・・・コンデンサ、３２・・・
・・・放電抵抗、３３・・・・・リセット解除用トラン
ジスタ、３４．・・０．。
リセット解除用抵抗、３５．３６・・・・・・抵抗、３
７０
・・・・・・コンデンサ、３８・・・・・・ノイズ防止
用コンデンサ、３９・・・・・・抵抗。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is an electrical circuit diagram of a conventional overload protection device for a multi-output switching power supply, and FIG. 2 is an electrical circuit diagram showing an embodiment of the overload protection device for a multi-output switching power supply according to the present invention. 14.15...DC input terminal, 16...
・Conversion transformer, 17... Overcurrent detection resistor, 1
8...Switching transistor, 19...
... Drive control circuit, 20.21 ... Rectifier diode, 22 ... Smoothing choke coil,
23... Prison - Namekawa Condenser, 24.26...
...Load, 26°. ... Photoinlator, 27 ... Output transistor, 28 ... Base resistor, 29 ...
...Timer IC multivibrator, 3o...
...Resistor, 31...Capacitor, 32...
. . . Discharge resistor, 33 . . . Reset release transistor, 34.・・0. . Resistor for reset release, 35.36... Resistor, 3
70... Capacitor, 38... Noise prevention capacitor, 39... Resistor. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2
Claims (1)
ンジスタのコレクタ電流を上記スイッチングトランジス
タのエミッタに接続した過電流検出抵抗によりスイッチ
ングのサイクル毎に検出［、複数の出力巻線に整流用ダ
イオード、平滑用のチョークコイルとコンデンサを接続
し、この一つの出力回路の出力端の出力電圧をアイソレ
ータを介して駆動制御回路に印加し、上記スイッチング
トランジスタのコレクタ電流がある限界値を超えたとき
過負荷を示すパルス信号を出し、このパルス信号を抵抗
とコンデンサの積分回路で受け、この精分回路の出力が
一定電圧に達することによりスイッチング動作を停止さ
せ、さらに一定時間後スイツチング動作を開始するタイ
マー回路からなるマルチバイブレータを備えた構成とす
る多出力スイッチング電源の過負荷保護装置。The collector current of the switching transistor connected to the output winding of the conversion transformer is detected every switching cycle by the overcurrent detection resistor connected to the emitter of the switching transistor. A choke coil and a capacitor are connected, and the output voltage at the output end of this one output circuit is applied to the drive control circuit via an isolator, and when the collector current of the switching transistor exceeds a certain limit value, an overload is indicated. Consists of a timer circuit that emits a pulse signal, receives this pulse signal through an integrating circuit of a resistor and a capacitor, stops the switching operation when the output of this dividing circuit reaches a certain voltage, and then starts the switching operation after a certain period of time. An overload protection device for a multi-output switching power supply configured with a multi-vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15158081A JPS5852709A (en) | 1981-09-24 | 1981-09-24 | Overload protecting device for multioutput switching power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15158081A JPS5852709A (en) | 1981-09-24 | 1981-09-24 | Overload protecting device for multioutput switching power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5852709A true JPS5852709A (en) | 1983-03-29 |
Family
ID=15521618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15158081A Pending JPS5852709A (en) | 1981-09-24 | 1981-09-24 | Overload protecting device for multioutput switching power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5852709A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152155A (en) * | 1984-08-21 | 1986-03-14 | Seikosha Co Ltd | Switching regulator |
| JPS63150487A (en) * | 1986-12-12 | 1988-06-23 | テクムゼ・プロダクツ・カンパニー | Compressor with improved-machine outside exposed thrust plate and assembling method |
| JPH02174556A (en) * | 1988-12-23 | 1990-07-05 | Origin Electric Co Ltd | Converter having drooping output characteristic |
| JPH04101289U (en) * | 1991-02-14 | 1992-09-01 | 新電元工業株式会社 | DC-DC converter |
-
1981
- 1981-09-24 JP JP15158081A patent/JPS5852709A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152155A (en) * | 1984-08-21 | 1986-03-14 | Seikosha Co Ltd | Switching regulator |
| JPS63150487A (en) * | 1986-12-12 | 1988-06-23 | テクムゼ・プロダクツ・カンパニー | Compressor with improved-machine outside exposed thrust plate and assembling method |
| JPH02174556A (en) * | 1988-12-23 | 1990-07-05 | Origin Electric Co Ltd | Converter having drooping output characteristic |
| JPH04101289U (en) * | 1991-02-14 | 1992-09-01 | 新電元工業株式会社 | DC-DC converter |
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