JPH01151987U

JPH01151987U -

Info

Publication number: JPH01151987U
Application number: JP4432888U
Authority: JP
Priority date: 1988-03-31
Filing date: 1988-03-31
Publication date: 1989-10-19

Description

[Brief explanation of the drawing]

第１図は本考案の第１の実施例の要部回路図、
第２図はその動作を説明するタイミングチヤート
、第３図は本考案の第２の実施例の要部回路図、
第４図は第２の実施例のタイミングチヤート、第
５図、第６図は本考案の第１の実施例に於けるほ
かの動作を示したタイミングチヤート、第６図は
第３の実施例の要部回路図、第７図、第９図は従
来のコンデンサ蓄勢式スポツト溶接機の要部回路
図、第８図、第１０図は第７図、第９図に示した
各々の回路に於ける放電電流の波形図説明図であ
る。［符号の説明］、Ｃ……コンデンサ、１……整
流回路、２……充電回路、３……スイツチング回
路、３ａ，３ｂ，３ｃ，３ｄ……サイリスタ、４
……溶接トランス、５……リセツト回路、５ａ…
…リセツトスイツチ、５ｂ……リレー接点（スイ
ツチング手段）。 FIG. 1 is a circuit diagram of the main part of the first embodiment of the present invention,
FIG. 2 is a timing chart explaining its operation, and FIG. 3 is a main circuit diagram of the second embodiment of the present invention.
Fig. 4 is a timing chart of the second embodiment, Figs. 5 and 6 are timing charts showing other operations in the first embodiment of the present invention, and Fig. 6 is a timing chart of the third embodiment. Figures 7 and 9 are circuit diagrams of the main parts of a conventional capacitor storage type spot welding machine, and Figures 8 and 10 are circuit diagrams of the respective circuits shown in Figures 7 and 9. FIG. 2 is an explanatory diagram of a waveform diagram of a discharge current in the discharge current. [Explanation of symbols], C... Capacitor, 1... Rectifier circuit, 2... Charging circuit, 3... Switching circuit, 3a, 3b, 3c, 3d... Thyristor, 4
...Welding transformer, 5...Reset circuit, 5a...
...Reset switch, 5b...Relay contact (switching means).

Claims

[Claims for Utility Model Registration] (1) The welding transformer is manufactured by driving a switching circuit composed of switching elements such as thyristors to instantly discharge the electric charge stored in the capacitor into the primary winding of the welding transformer. In a capacitor storage type spot welding machine which obtains welding current from the secondary side of the welding transformer, a switching means is provided between the anode and cathode of the switching element of the switching circuit provided in the primary winding of the welding transformer, and a reset switch is provided. 1. A capacitor storage type spot welding machine, characterized in that the spot welding machine is equipped with a reset circuit which operates the reset switch to actuate the switching means to forcibly turn off the switching element. (2) Claim 1 characterized in that a switching element constituting the switching circuit is arranged in series with the primary winding of the welding transformer, and a relay contact is connected in parallel to the switching element. The capacitor storage type spot welding machine described. (3) The capacitor energy storage device according to claim 1 or 2, wherein the switching circuit comprises two sets of switching elements connected to the primary winding of the welding transformer in a bridge-like manner and operating alternately. Type spot welding machine.