JPS5871030A - Power supply for electric discharge machining - Google Patents
Power supply for electric discharge machiningInfo
- Publication number
- JPS5871030A JPS5871030A JP16815381A JP16815381A JPS5871030A JP S5871030 A JPS5871030 A JP S5871030A JP 16815381 A JP16815381 A JP 16815381A JP 16815381 A JP16815381 A JP 16815381A JP S5871030 A JPS5871030 A JP S5871030A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- discharge machining
- fuse
- switching elements
- semiconductor switching
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/026—Power supply protection, e.g. detection of power switch breakdown
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、放電加工用電源装置のスイッチング面路に
使用される半導体スイッチング素子の保護および故障検
出に関するものである入 □従来この種の装
置として第１図に示すものかあった。（１）は直流定電
圧電源、（２）は半導体を保護するために高速で動作す
るヒユーズ、（３）はトランジスタなどの半導体スイッ
チング素子、（４）ｒｊ：被加工物と電極とで形成され
る放電加工間隙、（５）は線路のインダクタンス、 （
６）は（３）のオン・オフを制御する制御回路である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the protection and failure detection of semiconductor switching elements used in switching surfaces of power supplies for electrical discharge machining. There was. (1) is a DC constant voltage power supply, (2) is a fuse that operates at high speed to protect the semiconductor, (3) is a semiconductor switching element such as a transistor, and (4) rj: formed by a workpiece and an electrode. (5) is the line inductance, (
6) is a control circuit that controls on/off of (3).
＠２図は電流波形である。@2 Figure is the current waveform.
次に動作について説明する。直流定電圧電源（１）の直
流電圧Ｅは速動ヒユーズ（２）、複数個の並列接続され
た半導体スイッチング素子（３）を通して放電加工間隙
（４）に印加される。直流定電圧電源（１）、速動ヒユ
ーズ（２）、半導体スイッチング素子（３）で形成され
るスイッチング回路には電流制限抵抗器がなく線路の浮
遊インダクタンスＬ（５）が存在するだけである。半導
体スイッチング素子（３）は制御回路（６）によってオ
ン・オフを高速で繰り返し且つオン時間巾τｐ、オフ時
間巾τｒが制御されている。したがって放電加工間！１
（４）で絶縁が破れて放電電流が一但流れ出すと放電電
流は半導体スイッチング素子（３）のオン時間巾τやが
一定であれば、放電間［（ｎ放電維持電圧がほぼ一定値
となるため直流電圧Ｅ、線路のインダクタンスＬＫよっ
て決まる一定のピーク電流値をもった電流パルスとなる
。最大オン時間および速動ヒユーズの溶断電流も各スイ
ッチングトランジスタの最大定格電流を鑑みて設定され
る。したがって何らかの原因で過大な電流パルスが流れ
ると、まず連動ヒユーズが溶断しスイッチング回路を高
速にしゃ断するため半導体スイッチング素子の破壊を最
小限でくいとめることができる。Next, the operation will be explained. A DC voltage E from a DC constant voltage power source (1) is applied to the electrical discharge machining gap (4) through a fast acting fuse (2) and a plurality of semiconductor switching elements (3) connected in parallel. A switching circuit formed by a DC constant voltage power supply (1), a fast acting fuse (2), and a semiconductor switching element (3) has no current limiting resistor, and only the stray inductance L (5) of the line exists. The semiconductor switching element (3) is repeatedly turned on and off at high speed by a control circuit (6), and the on time width τp and the off time width τr are controlled. Therefore, during electrical discharge machining! 1
In (4), when the insulation is broken and a discharge current begins to flow, the discharge current becomes constant. Therefore, it becomes a current pulse with a constant peak current value determined by the DC voltage E and the line inductance LK.The maximum on time and the blowing current of the fast acting fuse are also set in consideration of the maximum rated current of each switching transistor. If an excessive current pulse flows for some reason, the interlocking fuse first blows out and shuts off the switching circuit at high speed, thereby minimizing damage to the semiconductor switching element.
従来の放電加工用電源装置は以上のように構成されてｂ
るので、速動ヒユーズが溶断して半導体スイッチング素
子に故障が発生し九ことがわかっても複数個の半導体ス
イッチング素子のうち故障を生じたものをみつけ出す作
業が必要で１部品の歌換えが能率的に行えないという欠
点があった。The conventional electrical discharge machining power supply device is configured as described above.
Therefore, even if it is determined that a fast-acting fuse has blown and a semiconductor switching element has failed, it is necessary to find out which of the multiple semiconductor switching elements has failed, and it is necessary to replace one component. The drawback was that it could not be done efficiently.
この発明は上記のような従来のものの欠点を除去するた
めになされたもので、複数個の半導゛体スイッチング素
子のうち故障を生じたものを外部に表示し良品への取換
えを能率的に行えるようにし、且つスイッチング回路を
高速にしゃ断し、半導体スイッチング素子の破壊を最小
限に抑えることのできる放電加工用電源装置を提供する
ことｔ＠的としている。This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and it is possible to display externally which one of the plurality of semiconductor switching elements has failed and to efficiently replace it with a good one. It is an object of the present invention to provide a power supply device for electrical discharge machining that can perform electrical discharge machining, cut off a switching circuit at high speed, and minimize damage to semiconductor switching elements.
以下この発明の一実施例を図について説明する。An embodiment of the present invention will be described below with reference to the drawings.
第８図において（７）は各半導体スイッチング素子に直
列に接続され且つ絶縁された警報出力をもつ速動ヒユー
ズで、（８）は各連動ヒユーズの溶接の有無を表示する
発光ダイオードなどから成る表示器、（９）は各速動ヒ
ユーズの警報出力の論理積出力により直流定電圧電源の
出力をしゃ断するしゃ断器である。第４図は本発明の絶
縁された警報出力をもつ速動ヒ４−スｙ）一実施例ｒ、
ｔｌＯａ）（ｆｏｂ）（１０ｃ）・・・（１０ｎ）は
ヒユーズの溶断の有無を電気的に検出する丸めの直流電
源％（ｌｌａ）（ｌｌｂ）（１１０）−（ｌｌｎ）は１
１’ＪＣ１ｌＪＫ絶縁された光結合素子、（１２ａ）
（１２１））（１２０）−（１２ｎ） Ｋ表示器（８）
を構成する発光タイオード、（１８ａ）（ｌｌｂ）（１
８０）−（１８ｎ） Ｖｉ各発光ダイオード用の直流電
源、 ｔ１４ａ）ｔ１４’ｂ）（１４ｃ）−ｌｌｎｎ
）は上記発光ダイオードの電流制限用抵抗器、（ハ）は
論理和回路である。In Fig. 8, (7) is a fast-acting fuse that is connected in series to each semiconductor switching element and has an isolated alarm output, and (8) is an indicator consisting of a light emitting diode, etc. that indicates whether each interlocking fuse is welded. The circuit breaker (9) is a circuit breaker which cuts off the output of the DC constant voltage power supply by the AND output of the alarm outputs of each fast-acting fuse. FIG. 4 shows an embodiment of the fast-acting system with isolated alarm output according to the present invention;
tlOa) (fob) (10c) ... (10n) is a rounded DC power supply that electrically detects whether or not the fuse is blown % (lla) (llb) (110) - (lln) is 1
1'JC1lJK isolated optocoupler, (12a)
(121)) (120)-(12n) K display (8)
Light emitting diodes, (18a) (llb) (1
80) - (18n) Vi DC power supply for each light emitting diode, t14a) t14'b) (14c) -llnn
) is a current limiting resistor for the light emitting diode, and (c) is an OR circuit.
スイッチング回路を構成する多数の半導体スイッチング
素子のうちいずれか１個の半導体スイッチング素子に故
障が発生し集中して電流がｆＩｔ′！′Ｌると対応した
運動ヒユーズがまず溶断し、該半導体スイッチング素子
にそれ以上電流が流れることを阻止し半導体スイッチン
グ素子ｔｆｉｋ護するとともに光結合素子によって対応
する発光ダイオードが消え、外部に咳連動ヒユーズが溶
断し故障が発生したことを表示する。光結合素子の出力
は同時に論理和回路に＃続されでいるため通常全ての運
動ヒユーズが溶断していない状態では該論理和回路の出
力は正論理でｒｌＪであるが、いずれか１つで４溶断す
ると該論理和回路の出力は正論理で、「０」となシこの
論理和回路の出力「０」によって直流安定化電源（１）
のしゃ断器（９）をしゃ断するように構成されているの
で半導体スイッチング素子の破壊を最小限に抑えるよう
に動作する。A failure occurs in one of the many semiconductor switching elements that make up the switching circuit, and the current flows fIt'! 'L, the corresponding motion fuse first melts, preventing any further current from flowing through the semiconductor switching element, protecting the semiconductor switching element tfik, and turning off the corresponding light emitting diode by the photocoupler, causing a cough-linked fuse to be externally connected. is fused, indicating that a failure has occurred. Since the output of the optical coupling element is simultaneously connected to the OR circuit, normally when all the motion fuses are not blown, the output of the OR circuit is positive logic and rlJ, but if any one of them When the fuse is blown, the output of the OR circuit is positive logic, and the output of the OR circuit is "0".
Since the circuit breaker (9) is configured to cut off the circuit breaker (9), it operates to minimize damage to the semiconductor switching element.
なお、上記寮施例では絶縁された警報出力管もつ速動ヒ
ユーズ（７）として光結合累子會利用したもの含水した
が、光結合素子の代わりに［―を設けてもよい、また、
ヒユーズの溶断を、正論理の「０」とせずにｒｌＪとし
てもよくこの場合にも論理回路の組合わせで同様の効果
を奏する。In the dormitory example above, an optical coupling element was used as a fast-acting fuse (7) with an insulated alarm output tube, but it is also possible to provide [- instead of an optical coupling element.
The fuse may be blown by rlJ instead of the positive logic "0", and in this case as well, the same effect can be achieved by combining logic circuits.
・以上のように１本発明によれば多数個の半導体スイッ
チング素子ごとに速動ヒユーズを設は且つ各連動ヒユー
ズの溶断の有無を電気的に検出し電源装置外部に表示器
によって表示するとともに。- As described above, according to the present invention, fast-acting fuses are provided for each of a large number of semiconductor switching elements, and whether or not each interlocking fuse is blown is electrically detected and indicated by a display outside the power supply device.
直流安定化電源を高速でしゃ断するように構成したので
多数個ある半導体スイッチング素子から故障の発生した
もの管−目で識別でき良品への皐換えｔ能率的に行え、
また半導体スイッチング素子や電源装置の他の部品に影
響管及ぼすことなく故障を最小限で抑えることができる
という効果がある。Since the DC stabilized power supply is configured to shut off at high speed, it is possible to visually identify faults in the large number of semiconductor switching elements, and to efficiently replace them with good ones.
Further, there is an effect that failures can be minimized without affecting the semiconductor switching elements or other parts of the power supply device.
力をもつ速動ヒユーズの一実施例を示す回路図である。
図中、（１）は直流定電圧電源、（３）は半導体スイッ
チング素子、（４）は放電加工間隙、（７）は絶縁され
た警報出力をもつ連動ヒエーズ％（８）は表示装置、（
９）はしゃ断器である。
なお、図中同一符号は同一、又は相当部分管示す。
代理人 葛 野 信 −
第１図
第２図
第３図
第４図FIG. 2 is a circuit diagram showing an embodiment of a fast acting fuse with power. In the figure, (1) is a DC constant voltage power supply, (3) is a semiconductor switching element, (4) is an electric discharge machining gap, (7) is an interlocking Hiase % with an insulated alarm output, (8) is a display device, (
9) It is a circuit breaker. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
導体スイッチング素子と、被加工物と電極とで形成され
る放電加工間隙とから成り、電流制限用抵抗器を含まな
い放電加工用スイッチング回路において、各半導体スイ
ッチング素子と直列に接続され且つ絶縁された警報出力
をもつ速動ヒユーズと、各半導体スイッチング素子に対
応した該各速動ヒユーズの警報出力、によって該直流定
電圧電源をしゃ断するしゃ断器と該警報出力によって該
番卒導体スイッチング素子の異常を表示する表示装置と
を備えた放電加工用電源装置。A switching circuit for electrical discharge machining that is composed of a DC constant voltage power supply, a plurality of semiconductor switching elements connected in parallel, and an electrical discharge machining gap formed between a workpiece and an electrode, and does not include a current limiting resistor. , a fast-acting fuse having an insulated alarm output connected in series with each semiconductor switching element, and an alarm output of each fast-acting fuse corresponding to each semiconductor switching element to cut off the DC constant voltage power supply. A power supply device for electrical discharge machining, comprising: a power supply device for electric discharge machining; and a display device that displays an abnormality in the conductor switching element by the alarm output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16815381A JPS5871030A (en) | 1981-10-21 | 1981-10-21 | Power supply for electric discharge machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16815381A JPS5871030A (en) | 1981-10-21 | 1981-10-21 | Power supply for electric discharge machining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5871030A true JPS5871030A (en) | 1983-04-27 |
Family
ID=15862794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16815381A Pending JPS5871030A (en) | 1981-10-21 | 1981-10-21 | Power supply for electric discharge machining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5871030A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111821A (en) * | 1984-11-06 | 1986-05-29 | Hitachi Seiko Ltd | Power-source apparatus for spark erosion machining |
-
1981
- 1981-10-21 JP JP16815381A patent/JPS5871030A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111821A (en) * | 1984-11-06 | 1986-05-29 | Hitachi Seiko Ltd | Power-source apparatus for spark erosion machining |
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