KR200270992Y1 - a inverter welding machine for a generator - Google Patents

Abstract

The present invention relates to an inverter welding machine for a generator, and more particularly, a rectifier 20 for full-wave rectifying and converting an input AC power into a DC power, and the DC power connected in parallel with the rectifier 20 and converted into the DC power. A high frequency converter for outputting a high frequency voltage by alternately operating a smoothing capacitor Vs for removing the ripple component and an operating voltage applied from both ends of the smoothing capacitor Vs according to the application of a control signal. 30), a transformer 40 for converting the input voltage applied from the high frequency converter 30 into a predetermined transformer ratio and outputting it to the secondary side, and a reactor for obtaining a stable current by an electromagnetic phenomenon. It consists of (50), it is required in the welding machine to receive full-wave AC power (AC) applied from a small capacity portable generator from the transformer and reactor to full-wave rectification Which it was to be converted to a stabilized direct current power source (DC).

In addition, by reinforcing the transformer and the reactor, it is possible to suppress the amount of harmonic currents, so that the welding work can be performed at a stable voltage, thereby increasing the reliability of the work.

Description

Inverter welding machine for generators {a inverter welding machine for a generator}

The present invention relates to an inverter welding machine for a generator, and more particularly, it converts an alternating voltage applied from a mobile generator into a direct current voltage and at the same time converts a low voltage of the generator so that the generator can be used even in an area where power supply is impossible. The present invention relates to an inverter welding machine for a generator that enables electric welding work.

In general, an electric welding machine is a welding machine made to efficiently perform electric welding, and is classified into resistance welding and arc welding, which use a heat to melt a metal according to a welding method.

Therefore, the electric resistance welding is a welding method in which a mechanical pressure is applied when a contact is heated to a high temperature by contacting two metals to be joined by welding, and electric arc welding is performed by contacting an electrode connected to a power source through a series resistance once. Next, arc discharge generated by isolation is used.

There are many kinds of such electric welding machine, and one of them is an inverter welding machine.

The inverter welding machine converts a commercial AC into a DC in a converter, makes an AC of high frequency in the inverter, and then converts it into a DC.

In other words, the inverter welding machine does not control welding current by the phase control of AC, and converts three-phase AC power into DC and then switches to high frequency using a switching element to make AC and then rectifies it. The welding current is controlled by supplying direct current to the base metal.

Inverter welding machine has higher welding quality, better thermal efficiency, and higher waveforms because it has superior current stability due to miniaturization of welding transformer (about 1/10 of AC type), reduction of power equipment capacity, and voltage fluctuation of welding power source, compared to general AC type. It can be controlled to have the best performance on the market.

However, when the conventional inverter welder is connected to the generator and used, the voltage of the welder is unstable due to the harmonic current generation amount, which causes a problem in welding.

The present invention was devised to solve the problems of the prior art, a stable DC power supply (DC) required by the welding machine by receiving a full-wave AC power (AC) applied from a transformer and a reactor applied from a small capacity mobile generator To be converted.

It is also an object of the present invention to provide an inverter welder for a generator that enables the welding operation at a stable voltage by suppressing harmonic current generation by reinforcement of a transformer and a reactor.

1 is a circuit diagram of an inverter welding machine for a generator according to the present invention

2a, 2b, 2c, 2d is a high power inverter inverter welding machine according to the present invention

Circuit diagram showing the operating state of the frequency converter

Explanation of symbols on the main parts of the drawings

20: rectifier 30: high frequency converter

40; Transformer 50: Reactor

Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the accompanying drawings, Figure 1 shows a circuit diagram of the inverter welding machine for generators according to the present invention, Figures 2a, 2b, 2c, 2d shows the operating state of the high frequency conversion unit of the inverter welding machine for generators according to the present invention It is a schematic showing.

As shown in the accompanying drawings, the inverter inverter welding machine according to the present invention is a rectifier 20 for converting the AC power input to the DC power, and the DC power connected in parallel with the rectifier 20 converted in parallel A high frequency converter for outputting a high frequency voltage by alternately operating a smoothing capacitor Vs for removing the embedded ripple component and an operating voltage applied from both ends of the smoothing capacitor Vs according to the application of a control signal. 30, a transformer 40 for converting the input voltage applied from the high frequency converter 30 into a predetermined transformer ratio and outputting it to the secondary side, and a stable current is obtained by the accumulation of electromagnetic energy. Characterized in that it comprises a reactor 50 for the bet.

The rectifier 20 rectifies the applied three-phase AC power source AC into a DC power source, and the plurality of diodes D1-D6 are connected in series and in parallel.

The diodes D1, D4, D2, D5, and D3, D6 of the rectifier 20 are connected to the corresponding phases of the AC power source to convert the (+) and (-) half waves into DC power (DC), respectively. It is full-wave rectification and conversion.

The smoothing capacitor Vs is connected to the rectifier 20 in parallel to remove the ripple component contained in the converted DC power DC.

The high frequency conversion unit 30 alternately operates an operating voltage applied from both ends of the smoothing capacitor Vs to output a high frequency voltage by connecting a control signal, and is connected to the smoothing capacitor Vs. And alternately switches S1, S2, S3, and S4 for outputting a high frequency voltage.

The transformer T1 converts the input voltage applied from the high frequency converter 20 into a predetermined transformer ratio and outputs the voltage to the secondary side. The transformer T1 has a winding ratio that varies depending on the size of the power to be output. In this design, the winding ratio is 5 Ts on the primary side, 19 Ts on the secondary side, and 5 Ts on the tertiary side, in order to generate the most stable output voltage. The output capacity was 230 A.

The reactor 50 has a winding ratio of 35Ts and an output capacity of 160A to obtain a stable current.

Inverter welding machine for a generator of the present invention having such a configuration, when AC power is applied from the generator, AC power is rectified through a plurality of diodes (D1-D6) through the rectifier 20 to convert to DC power In the converted DC power supply, the surge voltage of the ripple component is removed from the smoothing capacitor C1.

The smoothed DC power is applied to the switches S1, S2, S3, and S4 after passing through the high frequency converter 20.

As shown in FIGS. 3A, 3B, 3C, and 3D by the selection of the switches S1, S2, S3, and S4, the switch may be modified into four types and output.

Therefore, according to the present invention, since the generation of harmonic current is suppressed through the transformer T1, the voltage input from the generator can supply a stable voltage, thereby increasing the reliability of the welding operation.

As described above, the inverter inverter welding machine according to the present invention receives a low-voltage AC power (AC) applied from a small capacity mobile generator from the transformer and the reactor to full-wave rectification to the stable DC power (DC) required by the welder It is possible to convert, and the reinforcement of transformer and reactor can suppress the harmonic current generation, and it is possible to increase the reliability of the work by allowing welding work with stable voltage.

Claims (3)

A rectifying unit 20 for full-wave rectifying the input AC power and converting it into a DC power source, a smoothing capacitor Vs for removing ripple components embedded in the converted DC power in parallel with the rectifying unit 20, An operating voltage applied from both ends of the smoothing capacitor (Vs) alternately operates according to the application of a control signal to output a high frequency voltage, and an input applied from the high frequency conversion unit (30). A transformer (40) for converting a voltage to a predetermined transformer ratio and outputting the secondary side, and a reactor (50) for a generator, characterized in that it comprises a reactor (50) for obtaining a stable current by an electromagnetic phenomenon. The inverter welder of claim 1, wherein the transformer has a winding ratio of 19 Ts in the primary side, 5 Ts and 5 Ts in the secondary side, and an output capacity of 230 A. The inverter welding machine for generator according to claim 1, wherein the reactor (50) is manufactured with a winding ratio of 35Ts and an output capacity of 160A class.