JPH0370594B2 - - Google Patents
Info
- Publication number
- JPH0370594B2 JPH0370594B2 JP5490485A JP5490485A JPH0370594B2 JP H0370594 B2 JPH0370594 B2 JP H0370594B2 JP 5490485 A JP5490485 A JP 5490485A JP 5490485 A JP5490485 A JP 5490485A JP H0370594 B2 JPH0370594 B2 JP H0370594B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- capacitor
- signal
- charging voltage
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000003466 welding Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010304 firing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Generation Of Surge Voltage And Current (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、コンデンサ式抵抗溶接機に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a capacitor type resistance welding machine.
従来の技術
第５図は、従来のコンデンサ式抵抗溶接機にお
けるコンデンサ充電電圧制御装置の一例を示した
ものである。図において、１は充電用トランス、
２ａ，２ｂはダイオード、３ａ，３ｂはサイリス
タ、４はコンデンサ、７は溶接機、５は抵抗器、
６は放電用スイツチ、１８はサイリスタ３ａ，３
ｂの制御装置で充電電圧増幅回路８、電圧設定回
路９、比較回路１０、位相制御回路１１、点弧パ
ルス設定回路１２から成る。以下、第５図に示す
構成の動作を説明する。Prior Art FIG. 5 shows an example of a capacitor charging voltage control device in a conventional capacitor type resistance welding machine. In the figure, 1 is a charging transformer;
2a and 2b are diodes, 3a and 3b are thyristors, 4 is a capacitor, 7 is a welding machine, 5 is a resistor,
6 is a discharge switch, 18 is a thyristor 3a, 3
The control device b includes a charging voltage amplification circuit 8, a voltage setting circuit 9, a comparison circuit 10, a phase control circuit 11, and an ignition pulse setting circuit 12. The operation of the configuration shown in FIG. 5 will be explained below.
まず制御装置１８に充電開始信号が与えられる
と、コンデンサ４の充電電圧を増幅回路８で増幅
された充電電圧信号Vaと、電圧設定回路９の設
定電圧信号Vbとを比較回路１０で比較する。こ
の比較信号により位相制御回路１１で点弧位相が
決定され、点弧パルス設定回路１２で点弧パルス
信号が作られ、サイリスタ３ａ，３ｂに与えられ
る。 First, when a charge start signal is given to the control device 18, the comparison circuit 10 compares the charging voltage of the capacitor 4 with the charging voltage signal V a amplified by the amplifier circuit 8 and the set voltage signal V b of the voltage setting circuit 9. do. Based on this comparison signal, the phase control circuit 11 determines the firing phase, and the firing pulse setting circuit 12 generates a firing pulse signal, which is applied to the thyristors 3a and 3b.
そして前記充電電圧信号Vaと設定電圧Vbが同
じになると、点弧パルス信号が停止して充電が完
了する。 When the charging voltage signal V a and the set voltage V b become the same, the ignition pulse signal stops and charging is completed.
発明が解決しようとする問題点
しかし、コンデンサの充電電圧が設定電圧値に
充電されていて、充電電圧を上昇させたい場合は
設定電圧信号Vbを上昇するだけで、再度充電が
行なわれるが、充電電圧を低い値にしたい場合
は、一度放電用スイツチ６を投入して抵抗器５で
設定値より低い値に充電電圧を低下させておき再
度充電を行なうか、または溶接機を動作させ、コ
ンデンサの電荷を溶接電流として完全に放電し
て、再度低い設定電圧に充電する必要があつた。Problems to be Solved by the Invention However, if the charging voltage of the capacitor is already charged to the set voltage value and you want to increase the charging voltage, simply increase the set voltage signal V b and the capacitor will be charged again. If you want to lower the charging voltage, you can turn on the discharge switch 6 and reduce the charging voltage to a value lower than the set value with the resistor 5, and then charge again, or operate the welding machine and remove the capacitor. It was necessary to completely discharge the electric charge as a welding current and charge it again to a lower set voltage.
問題点を解決するための手段
本発明のコンデンサ式抵抗溶接機はコンデンサ
の充電電圧を検出し、充電電圧が一定となるよう
にフイードバツクをかけて制御するコンデンサ式
抵抗溶接機において、コンデンサ電圧と充電電圧
設定用の基準電圧とを比較して設定電圧以上にな
ると過電圧信号を出力する比較回路と、前記過電
圧信号が一定時限継続して出力された時に放電信
号を出力し、かつ前記過電圧信号が切れたのち一
定時限後に復帰する時限回路と、前記放電信号に
よりコンデンサの電荷を放電するように動作する
スイツチ手段とを具備したものである。Means for Solving the Problems The capacitor type resistance welding machine of the present invention detects the charging voltage of the capacitor and controls the capacitor voltage and charging voltage by applying feedback so that the charging voltage is constant. A comparator circuit that compares a reference voltage for voltage setting and outputs an overvoltage signal when the voltage exceeds the set voltage, and outputs a discharge signal when the overvoltage signal is continuously output for a certain period of time, and the overvoltage signal is turned off. The device is equipped with a timer circuit that returns after a certain period of time, and a switch means that operates to discharge the charge in the capacitor in response to the discharge signal.
作 用
上記構成において、充電電圧を検出して、その
充電電圧と設定電圧値とを比較して設定電圧以上
になると過電圧信号を出力する。その信号が一定
時限継続すると放電信号を出力して、コンデンサ
の電荷を放電する。また過電圧信号が切れても一
定時限放電を継続することにより充電電圧を設定
値より低い値まで低下させておき、再度充電を行
なう。Operation In the above configuration, the charging voltage is detected, the charging voltage is compared with a set voltage value, and when the voltage exceeds the set voltage, an overvoltage signal is output. When the signal continues for a certain period of time, a discharge signal is output, and the charge in the capacitor is discharged. Further, even if the overvoltage signal is cut off, the charging voltage is lowered to a value lower than the set value by continuing discharging for a certain period of time, and then charging is performed again.
従つてコンデンサの充電電圧が設定電圧値に充
電されていても、設定電圧を変更するだけで自動
的に充電電圧を任意の値に調整できる。 Therefore, even if the charging voltage of the capacitor is charged to the set voltage value, the charging voltage can be automatically adjusted to an arbitrary value simply by changing the set voltage.
実施例
第１図、第２図は本発明の一実施例を示し、図
において第５図と同じものは同一符号を付し説明
を省略する。さらに、２０は電圧調整装置で比較
回路１３、時限回路１４、スイツチ回路１５から
成る。また第２図は電圧調整装置２０の詳細回路
である。以下第２図に基づき動作を説明する。Embodiment FIGS. 1 and 2 show an embodiment of the present invention. In the figures, the same parts as in FIG. 5 are denoted by the same reference numerals, and their explanation will be omitted. Further, reference numeral 20 denotes a voltage regulating device comprising a comparator circuit 13, a time limit circuit 14, and a switch circuit 15. Further, FIG. 2 shows a detailed circuit of the voltage regulator 20. The operation will be explained below based on FIG.
いま、コンデンサの充電電圧は設定電圧値に充
電されていて、充電電圧信号Vaと設定電圧信号
Vbは同じ値になつているとする。そこで設定電
圧値を低い値に設定すると設定電圧信号Vbは低
下して、抵抗器２１，２２，２３，２４および演
算増幅器２５で構成している比較回路の出力には
過電圧信号Vcが出力される。前記信号Vcにより
抵抗器２８とコンデンサ２９を時定数として電圧
Vdが上昇して、抵抗器３０，３１，３２による
電圧Veに到達すると、演算増幅器３３の出力に
は放電信号Vfが出力される。前記信号Vfはイン
バータ３４により反転され、抵抗器３５，３６お
よびトランジスタ３７で増幅され、電磁接触器３
９のコイル３８を動作させ、接点１９を働らかせ
コンデンサの電荷を放電する。そして充電電圧信
号Vaが低下すると前記比較回転の過電圧信号Vc
は切れて、時限回路のコンデンサ８の充電電荷は
抵抗器２７，２８、ダイオード２６で放電され、
一定時限後に電磁接触器の接点１９が切れて放電
を停止する。その時の信号波形を第４図に示す。 Now, the charging voltage of the capacitor is charged to the set voltage value, and the charging voltage signal V a and the set voltage signal
Assume that V b has the same value. Therefore, when the set voltage value is set to a low value, the set voltage signal V b decreases, and an overvoltage signal V c is output from the comparator circuit made up of resistors 21, 22, 23, and 24 and the operational amplifier 25. be done. The voltage is increased by using the resistor 28 and capacitor 29 as a time constant using the signal Vc .
When V d increases and reaches the voltage V e generated by the resistors 30 , 31 , 32 , the operational amplifier 33 outputs a discharge signal V f . The signal V f is inverted by an inverter 34, amplified by resistors 35, 36 and a transistor 37, and then sent to the electromagnetic contactor 3.
The coil 38 of No. 9 is operated and the contact 19 is operated to discharge the charge in the capacitor. Then, when the charging voltage signal V a decreases, the overvoltage signal V c of the comparison rotation
is cut off, the charge in the capacitor 8 of the time limit circuit is discharged by the resistors 27 and 28 and the diode 26,
After a certain period of time, the contact 19 of the electromagnetic contactor is disconnected and the discharge is stopped. The signal waveform at that time is shown in FIG.
第３図は電圧設定回路の一実施例を示したもの
である。デジタルスイツチ５０と抵抗器５１，５
２および演算増幅器５５により一桁の電圧を作
り、抵抗器５３，５４および演算増幅器５６とで
各桁の電圧値を加算して設定電圧値Vbを出力す
る。このようにデジタルスイツチで設定電圧回路
を構成するとスイツチ操作のために可変抵抗器な
どのように連続的に電圧値が変化しない欠点があ
り短時間、第４図のように設定電圧信号Vbが低
下する場合があるが電圧調整装置に時限回路を付
けることにより前記欠点による誤動作はなくな
る。 FIG. 3 shows an embodiment of the voltage setting circuit. Digital switch 50 and resistors 51, 5
2 and an operational amplifier 55 to generate a single-digit voltage, and resistors 53 and 54 and an operational amplifier 56 add the voltage values of each digit to output a set voltage value V b . If the setting voltage circuit is configured with a digital switch in this way, the voltage value will not change continuously due to switch operation, unlike with a variable resistor . Although the voltage may drop, malfunctions due to the above-mentioned drawbacks can be eliminated by providing a timer circuit to the voltage regulator.
発明の効果
以上の説明から明らかなように本発明によれ
ば、充電電圧の設定値の変更に放電スイツチなど
の操作が不要となり、設定値を変えるだけで自動
的に電圧調整ができ、操作性の向上および高精度
の充電が出来る。Effects of the Invention As is clear from the above explanation, according to the present invention, there is no need to operate a discharge switch or the like to change the set value of the charging voltage, and the voltage can be adjusted automatically just by changing the set value, making it easy to operate. It is possible to improve the performance and perform high-precision charging.
第１図は本発明の一実施例を示すコンデンサ式
抵抗溶接器のコンデンサ充電電圧制御装置のブロ
ツク図、第２図は同充電電圧制御装置の電圧調整
装置の回路図、第３図は同充電電圧制御装置の電
圧設定回路の回路図、第４図は第２図における各
部の信号波形図、第５図は従来のコンデンサ充電
電圧制御装置のブロツク図である。
１３……比較回路、１４……時限回路、１５…
…スイツチ回路、２５，３３，５５，５６……演
算増幅器、３４……インバータ、３７……トラン
ジスタ、３９……電磁接触器。
Fig. 1 is a block diagram of a capacitor charging voltage control device for a capacitor-type resistance welding machine showing an embodiment of the present invention, Fig. 2 is a circuit diagram of a voltage regulator of the same charging voltage control device, and Fig. 3 is a circuit diagram of the same charging voltage control device. FIG. 4 is a circuit diagram of a voltage setting circuit of a voltage control device, FIG. 4 is a signal waveform diagram of each part in FIG. 2, and FIG. 5 is a block diagram of a conventional capacitor charging voltage control device. 13... Comparison circuit, 14... Time limit circuit, 15...
...Switch circuit, 25, 33, 55, 56... Operational amplifier, 34... Inverter, 37... Transistor, 39... Magnetic contactor.
Claims (1)
一定となるようにフイードバツクをかけて制御す
るコンデンサ式抵抗溶接機において、コンデンサ
電圧と充電電圧設定用の基準電圧とを比較してコ
ンデンサ電圧が設定電圧より高くなると過電圧信
号を出力する比較回路と、前記過電圧信号が一定
時限継続して出力された時に放電信号を出力し、
かつ前記過電圧信号が切れたのち一定時限後に放
電信号を復帰させる抵抗器とコンデンサおよび演
算増器からなる時限回路と、前記放電信号により
コンデンサの電荷を放電するように動作する電磁
接触器等のスイツチ手段とを具備したコンデンサ
式抵抗溶接機。1 In a capacitor-type resistance welding machine that detects the charging voltage of a capacitor and controls it by applying feedback to keep the charging voltage constant, the capacitor voltage is compared with the reference voltage for setting the charging voltage and the capacitor voltage is determined to be the set voltage. a comparator circuit that outputs an overvoltage signal when the overvoltage signal becomes higher; and a comparator circuit that outputs a discharge signal when the overvoltage signal is continuously output for a certain period of time;
and a time circuit consisting of a resistor, a capacitor, and an operational amplifier that restores the discharge signal after a certain period of time after the overvoltage signal is cut off, and a switch such as an electromagnetic contactor that operates to discharge the charge in the capacitor in response to the discharge signal. A capacitor-type resistance welding machine equipped with means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60054904A JPS61212486A (en) | 1985-03-19 | 1985-03-19 | Capacitor type resistance welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60054904A JPS61212486A (en) | 1985-03-19 | 1985-03-19 | Capacitor type resistance welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212486A JPS61212486A (en) | 1986-09-20 |
| JPH0370594B2 true JPH0370594B2 (en) | 1991-11-08 |
Family
ID=12983591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60054904A Granted JPS61212486A (en) | 1985-03-19 | 1985-03-19 | Capacitor type resistance welding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212486A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03174984A (en) * | 1989-12-04 | 1991-07-30 | Nippon Avionics Co Ltd | Electrostatic stored energy type welding power unit |
| JP4464531B2 (en) * | 2000-05-26 | 2010-05-19 | ミヤチテクノス株式会社 | Resistance welding power supply |
-
1985
- 1985-03-19 JP JP60054904A patent/JPS61212486A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61212486A (en) | 1986-09-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |