JPH02307326A - Rush current preventing circuit for power unit - Google Patents
Rush current preventing circuit for power unitInfo
- Publication number
- JPH02307326A JPH02307326A JP1124132A JP12413289A JPH02307326A JP H02307326 A JPH02307326 A JP H02307326A JP 1124132 A JP1124132 A JP 1124132A JP 12413289 A JP12413289 A JP 12413289A JP H02307326 A JPH02307326 A JP H02307326A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- limiting resistor
- current limiting
- current
- relay
- 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 51
- 238000009499 grossing Methods 0.000 claims abstract description 30
- 230000002265 prevention Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241000237502 Ostreidae Species 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000020636 oyster Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
Description
【発明の詳細な説明】
(1)発明の目的
[産業上の利用分野]
本発明は電源装置、特に工作機械やロボット装置等に使
用されるサーボモータの制御装置に直流電流を供給する
電源装置に利用されるものである。Detailed Description of the Invention (1) Purpose of the Invention [Field of Industrial Application] The present invention relates to a power supply device, particularly a power supply device that supplies direct current to a control device for a servo motor used in machine tools, robot devices, etc. It is used for.
[従来の技術]
第2図は従来より実施されている電源装置の概念を示す
回路図で、3相220vの商用電源を主スィッチ1を介
して主整流器2に供給し、直流に変換して限流抵抗4を
介して平滑コンデンサ3によりリップルを減少させて十
一端子より制御装置に供給するように構成され、平滑コ
ンデンサ3の端子に抵抗6を介してリレーのコイル5−
1が接続され、リレーのa接点5−2が限流抵抗4の両
端に接続されており、ダイオード7はリレーのコイル5
−1の逆起電力を吸収する装置である。[Prior Art] Figure 2 is a circuit diagram showing the concept of a conventional power supply device, in which a three-phase 220V commercial power supply is supplied to a main rectifier 2 via a main switch 1, and converted to direct current. The ripple is reduced by a smoothing capacitor 3 via a current limiting resistor 4 and supplied to the control device from an eleventh terminal, and a relay coil 5- is connected to the terminal of the smoothing capacitor 3 via a resistor 6.
1 is connected, the a contact 5-2 of the relay is connected to both ends of the current limiting resistor 4, and the diode 7 is connected to the coil 5 of the relay.
This is a device that absorbs a back electromotive force of -1.
図において限流抵抗4は、主スィッチ1を投入すると主
整流器2の出力電圧で平滑コンデンサ3を充電するため
大きな突入電流が流れ、主整流器と平滑コンデンサを破
損することがあるので突入電流の大きさを制限し、前記
主要部品の破損を防止することを目的として設けである
。In the figure, when the main switch 1 is turned on, the current limiting resistor 4 charges the smoothing capacitor 3 with the output voltage of the main rectifier 2, so a large inrush current flows, which may damage the main rectifier and the smoothing capacitor. This is intended to limit the damage to the main parts and prevent damage to the main parts.
ところが限流抵抗4を挿入したままであると突入電流は
防止できるが限流抵抗4における電圧降下が大きく、損
失と電圧変動が大きくなるという欠点が生じる。そこで
限流抵抗4の両端にリレーのa接点5−2を設け、この
リレーのコイル5−1を平滑コンデンサ3の端子に抵抗
6を介して接続すると、主スィッチ1の投入直後はリレ
ーのa接点5−2が開放されているから限流抵抗4を介
して平滑コンデンサ3が充電されるので突入電流が防止
され、平滑コンデンサ3の端子電圧がある値に達すると
リレーのa接点5−2が閉じて限流抵抗4が短絡され、
電圧降下が小さくなり損失が減少し電圧変動も小さくで
きる効果がある。However, if the current-limiting resistor 4 is left inserted, inrush current can be prevented, but the voltage drop across the current-limiting resistor 4 is large, resulting in disadvantages such as increased loss and voltage fluctuation. Therefore, if a contact 5-2 of the relay is provided at both ends of the current-limiting resistor 4, and the coil 5-1 of this relay is connected to the terminal of the smoothing capacitor 3 via the resistor 6, immediately after the main switch 1 is turned on, the contact 5-2 of the relay is Since the contact 5-2 is open, the smoothing capacitor 3 is charged via the current limiting resistor 4, so inrush current is prevented, and when the terminal voltage of the smoothing capacitor 3 reaches a certain value, the a contact 5-2 of the relay is charged. is closed and the current limiting resistor 4 is short-circuited,
This has the effect of reducing voltage drop, reducing loss, and reducing voltage fluctuations.
主スィッチ1をOFFとして主整流器2を休止させ平滑
コンデンサ3が充分に放電して端子電圧がリレーの動作
電圧以下になるとリレーのa接点5−2が開放され、限
流抵抗4が回路に挿入されるので、再度主スィッチ1を
投入した場合は前記と同じ動作により突入電流を防止し
て安全に起動ができる。When the main switch 1 is turned OFF to stop the main rectifier 2 and the smoothing capacitor 3 is sufficiently discharged and the terminal voltage becomes below the relay operating voltage, the relay's a contact 5-2 is opened and the current limiting resistor 4 is inserted into the circuit. Therefore, when the main switch 1 is turned on again, the same operation as described above is performed to prevent inrush current and enable safe startup.
[発明が解決しようとする課題]
ところが主スィッチをOFFとした直後に再度投入する
と、リレーのa接点が閉接されて限流抵抗が短絡されて
いるので大きな突入電流が流れることがあり、リレーの
a接点を溶着させるという問題を生ずる。[Problems to be Solved by the Invention] However, when the main switch is turned off and then turned on again, the a contact of the relay is closed and the current limiting resistor is shorted, so a large inrush current may flow, causing the relay to This causes the problem of welding the a-contact.
この問題は主スィッチの開閉のみならず瞬時の停電によ
っても起る場合がある。This problem can occur not only when the main switch is opened or closed, but also when a momentary power outage occurs.
本発明は前記のような従来技術における問題を解決し、
主スィッチをOFFした直後に再投入しても突入電流が
流れない突入電流防止回路を得るにある。The present invention solves the problems in the prior art as described above,
To obtain an inrush current prevention circuit in which no inrush current flows even if a main switch is turned on again immediately after being turned off.
(2)発明の構成 [課題を解決するための手段] 本発明においては前記の問題を解決するため。(2) Structure of the invention [Means to solve the problem] In order to solve the above problem in the present invention.
平滑コンデンサの端子電圧を検出してコンデンサに充電
する第1の手段と、主整流器の交流側電圧を検出する第
2の手段と、第2の手段の出力で前記コンデンサの電荷
を制御する第3の手段及び、前記コンデンサの電荷で制
御される第4の手段とにより、限流抵抗を短絡するリレ
ーのコイルの通電を制御する構成で達成する。a first means for detecting the terminal voltage of the smoothing capacitor and charging the capacitor; a second means for detecting the AC side voltage of the main rectifier; and a third means for controlling the electric charge of the capacitor by the output of the second means. This is achieved by a configuration in which energization of a coil of a relay that short-circuits a current-limiting resistor is controlled by the above means and a fourth means controlled by the electric charge of the capacitor.
[作 用]
第1の手段により平滑コンデンサの端子電圧が所定のレ
ベルに達した後にコンデンサが充電を開始し、コンデン
サの電圧があるレベルに達したら第4の手段でリレーの
a接点を閉接して限流抵抗を短絡する構成と、第2の手
段で検出した主整流器の交流側電圧のある無しにより第
3の手段でコンデンサの電荷を制御し、交流側電圧が無
ければコンデンサの回路を短絡して第4の手段の動作を
阻止する構成とにより、主スィッチが再投入されてもコ
ンデンサの電圧があるレベルに達するまでは第4の手段
は動作できないから、電源の瞬時停電等の場合でも瞬時
にコンデンサが放電し、再起動するときにコンデンサが
充電するまでは限流抵抗が短絡されず突入電流を防止で
きる。[Function] After the terminal voltage of the smoothing capacitor reaches a predetermined level by the first means, the capacitor starts charging, and when the capacitor voltage reaches a certain level, the fourth means closes the a contact of the relay. The configuration is such that the current limiting resistor is short-circuited by the second means, and the charge of the capacitor is controlled by the third means depending on the presence or absence of the AC side voltage of the main rectifier detected by the second means, and if there is no AC side voltage, the capacitor circuit is short-circuited. Even if the main switch is turned on again, the fourth means cannot operate until the voltage of the capacitor reaches a certain level, so even in the case of a momentary power outage, etc. The capacitor is instantly discharged, and the current limiting resistor is not short-circuited until the capacitor is charged when restarting, preventing inrush current.
[実施例]
第1図は本発明を実施した突入電流防止回路を備えた電
源装置の回路図で、第2図に示した従来技術と同じ部分
は同じ符号を付けてその説明を省略する。[Embodiment] FIG. 1 is a circuit diagram of a power supply device equipped with an inrush current prevention circuit embodying the present invention, and the same parts as those in the prior art shown in FIG. 2 are given the same reference numerals and their explanation will be omitted.
図において第1のツェナーダイオド9と抵抗10とコン
デンサ11とを直列に接続して平滑コンデンサ3の端子
に接続し、平滑コンデンサ3の端子電圧が第1のツェナ
ーダイオード9のツェナー電圧を超えたら抵抗10を介
してコンデンサ11が充電を開始するように構成された
第1の手段と、主整流器2の交流側電圧をダイ−オド1
2で整流し平滑回路を介してトランジスタ13のベース
に接続し、他の電源15より抵抗14を介してトランジ
スタ13のコレクタに接続すると共にトランジスタ16
のベースに接続する第2の手段と、トランジスタ16の
コレクタは抵抗を介してコンデンサ11の端子に接続さ
れ、コンデンサ11の端子は第2のツェナーダイオード
17を介してトランジスタ18のベースに接続する第3
の手段と、トランジスタ18のコレクタがリレーのコイ
ル5−1と抵抗を介して平滑コンデンサ3の端子に接続
されている第4の手段とに依り構成されている。In the figure, a first Zener diode 9, a resistor 10, and a capacitor 11 are connected in series and connected to the terminal of a smoothing capacitor 3, and when the terminal voltage of the smoothing capacitor 3 exceeds the Zener voltage of the first Zener diode 9, The first means is configured to start charging the capacitor 11 via the resistor 10, and the AC side voltage of the main rectifier 2 is connected to the diode 1.
2 is connected to the base of the transistor 13 via a rectifying and smoothing circuit, and connected to the collector of the transistor 13 via a resistor 14 from another power source 15, and the transistor 16
and second means connected to the base of the transistor 18, the collector of the transistor 16 being connected via a resistor to the terminals of the capacitor 11, the terminals of the capacitor 11 being connected via a second Zener diode 17 to the base of the transistor 18. 3
and a fourth means in which the collector of the transistor 18 is connected to the terminal of the smoothing capacitor 3 via the relay coil 5-1 and a resistor.
図示の回路の動作を説明すると、主スィッチ1を投入す
ると主整流器2が動作し限流抵抗4を介して平滑コンデ
ンサ3が充電され端子電圧が上昇し、平滑コンデンサ3
の端子電圧が第1のツェナーダイオード9のツェナー電
圧を超えると抵抗10を介してコンデンサ11が充電を
開始する。To explain the operation of the illustrated circuit, when the main switch 1 is turned on, the main rectifier 2 operates, the smoothing capacitor 3 is charged via the current limiting resistor 4, the terminal voltage rises, and the smoothing capacitor 3
When the terminal voltage of the first Zener diode 9 exceeds the Zener voltage of the first Zener diode 9, the capacitor 11 starts charging via the resistor 10.
−カキ整流器2の交流側電圧はダイオード12で整流さ
れ平滑回路を介してトランジスタ13のベースに電流を
流し、トランジスタ13をON状態とするからトランジ
スタ16はOFFと成り。- The AC side voltage of the oyster rectifier 2 is rectified by the diode 12, and current flows through the smoothing circuit to the base of the transistor 13, turning the transistor 13 on, so the transistor 16 turns off.
コンデンサ11の電圧が第2のツェナーダイオード17
のツェナー電圧を超えると抵抗を介してトランジスタ1
8のベースに電流が流れ、トランジスタ18がON状態
と成りリレーのコイル5−1が励磁されてリレーのa接
点5−2が閉接され。The voltage of the capacitor 11 is connected to the second Zener diode 17
When the Zener voltage of transistor 1 is exceeded through the resistor,
A current flows through the base of the transistor 8, turning on the transistor 18, energizing the relay coil 5-1, and closing the relay's a contact 5-2.
限流抵抗4が短絡されて定常運転になる。The current limiting resistor 4 is short-circuited and the operation becomes steady.
主スィッチ1をOFFにすると主整流器2の交流側電圧
が零と成るからトランジスタ13がOFFとなり、トラ
ンジスタ16がONとなってコンデンサ11の電荷を瞬
時に放電し、トランジスタ18をOFFとするからリレ
ーのa接点5−2が開放され限流抵抗4が平滑コンデン
サ3の回路に直列に挿入され再起動に備える状態と成る
。When the main switch 1 is turned off, the AC side voltage of the main rectifier 2 becomes zero, so the transistor 13 is turned off, and the transistor 16 is turned on, instantly discharging the charge in the capacitor 11, and turning off the transistor 18, so the relay The a contact 5-2 is opened and the current limiting resistor 4 is inserted in series with the circuit of the smoothing capacitor 3 to prepare for restart.
第3図はある実施例の動作状態のオツシログラムを示し
たものである。同図には主整流器2の交流側電圧と、平
滑コンデンサ3の端子電圧と、限流抵抗4の電流及びリ
レーのコイル5−1の電流とが夫々記録され、タイミン
グ1で主スィッチ1が投入されると限流抵抗4の電流が
制曝値まで上昇したのち減少すると共に平滑コンデンサ
3の端子電圧が上昇し、約0.35秒後にリレーのコイ
ル5−1がONとなると共に限流抵抗4の電流が零とな
る。次にタイミング2で主スィッチ1をOFFにすると
リレーのコイル5−1の電流が零と成り平滑コンデンサ
3の端子電圧はゆっくり低下し。FIG. 3 shows an oscillogram of the operating state of an embodiment. In the figure, the AC side voltage of the main rectifier 2, the terminal voltage of the smoothing capacitor 3, the current of the current limiting resistor 4, and the current of the relay coil 5-1 are recorded, respectively, and the main switch 1 is turned on at timing 1. When this happens, the current in the current limiting resistor 4 rises to the limiting value and then decreases, and the terminal voltage of the smoothing capacitor 3 rises. After about 0.35 seconds, the coil 5-1 of the relay turns on and the current limiting resistor 4 decreases. 4 current becomes zero. Next, when the main switch 1 is turned off at timing 2, the current in the relay coil 5-1 becomes zero, and the terminal voltage of the smoothing capacitor 3 slowly decreases.
タイミング3で平滑コンデンサ3の端子電圧が充分低下
しない状態で再度主スィッチ1が投入されても限流抵抗
4の電流は制限値以内であり突入電流は確実に防止され
ている。Even if the main switch 1 is turned on again at timing 3 before the terminal voltage of the smoothing capacitor 3 has decreased sufficiently, the current in the current limiting resistor 4 is within the limit value, and inrush current is reliably prevented.
[発明の効果]
本発明による電源装置の突入電流防止回路は前記のよう
な構成であるから、主スィッチをOFFFF時短時間に
再投入しても限流抵抗を短絡する回路が確実に復帰して
おり突入電流を防止できる効果がある。[Effects of the Invention] Since the inrush current prevention circuit of the power supply device according to the present invention has the above-described configuration, the circuit that short-circuits the current limiting resistor can be reliably restored even if the main switch is turned on again in a short time after being turned off. This has the effect of preventing inrush current.
第1図は本発明になる電源装置の突入電流防止回路の構
成を示す回路図、第2図は従来より実施されている電源
装置の突入電流防止回路の回路図第3図は本発明になる
電源装置の突入電流防止回路の動作状態を示すオツシロ
グラムである。
符号の説明
1・・・主スィッチ、2・・・主整流器、3・・・平滑
コンデンサ、4・・・限流抵抗、5−1・・・リレーコ
イル、5−2・・・リレーのa接点、6,10.14・
・・抵抗。
7.12・・・ダイオード、9.17・・・ツェナーダ
イオード、11・・・コンデンサ、13,16.18・
・・トランジスタ、15・・・他の直流電源。Fig. 1 is a circuit diagram showing the configuration of an inrush current prevention circuit of a power supply device according to the present invention, and Fig. 2 is a circuit diagram of a conventional inrush current prevention circuit of a power supply device according to the present invention. It is an oscillogram showing the operating state of the inrush current prevention circuit of the power supply device. Explanation of symbols 1... Main switch, 2... Main rectifier, 3... Smoothing capacitor, 4... Current limiting resistor, 5-1... Relay coil, 5-2... Relay a Contact, 6,10.14・
··resistance. 7.12...Diode, 9.17...Zener diode, 11...Capacitor, 13,16.18.
...transistor, 15...other DC power supply.
Claims (1)
等の制御装置に供給する電源装置に応用するもので、主
整流器と平滑コンデンサの間に限流抵抗を介挿し、該限
流抵抗の両端にリレーのa接点を介在させ、該リレーの
コイルを平滑コンデンサの端子に接続し、平滑コンデン
サの端子電圧を検出して前記限流抵抗の通電を制御する
構成の突入電流防止回路において、平滑コンデンサの端
子電圧を検出してコンデンサに充電する第1の手段と、
主整流器の交流側電圧を検出する第2の手段と、第2の
手段の出力で第1の手段のコンデンサの電荷を制御する
第3の手段及び、前記コンデンサの電荷で制御される第
4の手段とにより前記リレーのコイルを通電制御する構
成を特徴とする電源装置の突入電流防止回路。This is applied to a power supply device that rectifies commercial power and supplies DC current to a control device such as a motor through a smoothing circuit.A current limiting resistor is inserted between the main rectifier and a smoothing capacitor, and the current limiting resistor is In an inrush current prevention circuit configured to have a contact A of a relay interposed at both ends, a coil of the relay connected to a terminal of a smoothing capacitor, and a terminal voltage of the smoothing capacitor detected to control energization of the current limiting resistor. a first means for detecting the terminal voltage of the capacitor and charging the capacitor;
a second means for detecting the AC side voltage of the main rectifier; a third means for controlling the electric charge of the capacitor of the first means by the output of the second means; and a fourth means for controlling the electric charge of the capacitor of the first means by the output of the second means. An inrush current prevention circuit for a power supply device, characterized in that the circuit controls energization of the coil of the relay by means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1124132A JPH02307326A (en) | 1989-05-19 | 1989-05-19 | Rush current preventing circuit for power unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1124132A JPH02307326A (en) | 1989-05-19 | 1989-05-19 | Rush current preventing circuit for power unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02307326A true JPH02307326A (en) | 1990-12-20 |
Family
ID=14877713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1124132A Pending JPH02307326A (en) | 1989-05-19 | 1989-05-19 | Rush current preventing circuit for power unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02307326A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0522853A (en) * | 1991-07-12 | 1993-01-29 | Fujitsu Denso Ltd | Rush current avoiding circuit |
JPH06217457A (en) * | 1993-01-13 | 1994-08-05 | Nec Corp | Power supply system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58144529A (en) * | 1982-02-19 | 1983-08-27 | 富士通株式会社 | Rush current suppressing circuit |
JPS59172930A (en) * | 1983-03-17 | 1984-09-29 | 富士通株式会社 | Rush current preventing circuit of power source |
-
1989
- 1989-05-19 JP JP1124132A patent/JPH02307326A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58144529A (en) * | 1982-02-19 | 1983-08-27 | 富士通株式会社 | Rush current suppressing circuit |
JPS59172930A (en) * | 1983-03-17 | 1984-09-29 | 富士通株式会社 | Rush current preventing circuit of power source |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0522853A (en) * | 1991-07-12 | 1993-01-29 | Fujitsu Denso Ltd | Rush current avoiding circuit |
JPH06217457A (en) * | 1993-01-13 | 1994-08-05 | Nec Corp | Power supply system |
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