KR800001870Y1 - 3 phase type direct current welding machine - Google Patents

Abstract

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Description

Three phase dc welding machine

1 is a circuit diagram of the present invention.

2 is a circuit diagram of a three-phase direct current welder for photocells.

The present invention relates to a three-phase DC welding machine characterized in that by using a control transformer in the three-phase DC welding machine, only the required amount of power is directly transferred to the secondary to the welding power.

In the conventional three-phase DC welding machine, even the unnecessary power is supplied from the primary to the secondary of the three-phase main transformer, and then a separate power supply is drawn from the primary to control the secondary large power to the required amount of power. Make separate control power by using transformer, single-phase transformer, rectifier, etc., and then apply control DC power to 3 sets of large single-phase control transformers to generate magnetic force and control the welding power by adjusting the saturation of magnetic force. In order to obtain welding power through the silicon rectifier, there are many control parts such as three large single-phase control transformers, single-phase variable transformers, single-phase transformers for control power supply, and rectifiers. Power loss is huge because DC power is controlled by DC current, and there are many transformers. The loss of power was enormous.

In the present invention, in order to compensate for the above-mentioned defects, by connecting one separate three-phase variable control transformer of the three-phase main transformer input lane, the tap is grounded as a triple switch and the number of turns of the coil is adjusted to adjust the amount of power required. By controlling from the first to the second to prevent the loss of power and to simplify the parts to easily and simply mass production as described in detail by the accompanying circuit diagram as follows. That is, a three-phase main transformer (1) in a known three-phase DC welding machine which supplies appropriate welding power by controlling the secondary large power of the three-phase main transformer 1 by using a single phase variable transformer, a single phase transformer for control power, a rectifier, and a large single phase transformer. Lead coils (a ') (b') and (c ') are drawn from the primary coils (a), (b) and (c), respectively, and coils of the separate three-phase variable control transformer (a) (3) by connecting the grounding tap (ga ') (b) (da) at the same time as the triple switch (4) to control the welding power required in the primary to supply to the three phase transformer (1) secondary. It is a feature.

When the input and output voltages are configured as E ₁ and E ₂ transformers, the total number of primary and secondary windings is N ₁ and N ₂ . By the principle of (E ₁ , E ₂ ) is constant. If N ₁ is changed (i.e., the auxiliary transformer is performed by changing the taps of b and c).

Since E ₂ changes, power control on the secondary side becomes possible, and thus the required power can be obtained.

On the other hand, if only the required amount of power is transferred to the secondary coil, the rectifier circuit 2 rectifies the pure DC current to weld.

As such, the present invention uses only one three-phase variable control transformer (3) to control the three-phase main transformer and the second large power by controlling the current in the required amount of current in the primary coil of the three-phase main transformer (1). It is possible to reduce the waste of power under no load or load to the minimum, and to reduce the volume of the welding machine itself by not using a lot of transformers, and the manufacturing cost is also reduced to about one half of the conventional one, compared to the method of controlling by using a rectifier and a rectifier circuit. It is possible to supply large quantities to consumers at low prices.

Claims (1)

As shown in the figure, in the known three-phase DC welding machine, the lead wires a ', b', and c 'of the three-phase main transformer 1 are drawn out, respectively. Connect the coil (a) (b) (c) of the 3-phase variable control transformer (3) and adjust the ground tap (ga) (b) (b) (3) with the triple switch (4). Three-phase direct current welder, characterized in that passed to the secondary coil.