KR100850261B1 - Apparatus for changing switch of electrical welding machine - Google Patents

Abstract

A power switching device in an electric welding machine is provided to prevent an electric shock to a user by forming a switch part for controlling the series and parallel connection of a relay part according to the position of switching. A power switching device(100) in an electric welding machine comprises first and second capacitors, first and second high frequency switching parts, a relay part(120), and a switch part(110). The first and second capacitors convert input power into a direct current and smoothes a ripple voltage of the converted direct current. The first and second high frequency switching parts connected to two ends of the first and second capacitors generates a high frequency output voltage. The relay part couples the first capacitor and the first high frequency switching part, with the second capacitor and the second high frequency switching part in series and parallel. The switch part installed at the front surface of the electric welding machine controls the series and parallel connection of the relay part according to the position of switching.

Description

Power converter of electric welding machine {APPARATUS FOR CHANGING SWITCH OF ELECTRICAL WELDING MACHINE}

The present invention relates to a power conversion device of an electric welder, and more particularly, to a power conversion device of an electric welder that can easily change the input voltage, and can prevent the risk of electric shock of the user when the input voltage changes.

There are many types of electric welding machines, and one of them is a welding machine using an inverter that converts a commercial alternating current from a converter to a direct current, an inverter generates a high frequency alternating current, and then converts it back to a direct current.

The input power of the electric welding machine using the inverter mainly uses 220V, 380V, 440V, and is configured to convert the power through the power converter of the inverter according to the input power of the site.

1 to 3 are diagrams illustrating power conversion circuits and voltage settings of a conventional electric welding machine.

A conventional inverter power supply for an electric welding machine includes a full-wave rectifier circuit (2) for converting a three-phase AC power source (1) into a direct current, and a first smoothing capacitor for smoothing the ripple voltage included in the direct current ( 6a) and the second smoothing capacitor 6b and the first and second smoothing capacitors 6a and 6b respectively receive operating voltages and are operated alternately in response to the application of the control signal to generate high frequency output voltages. A first terminal drawn from a connection point between the first high frequency conversion circuit 3 and the second high frequency conversion circuit 4 to be applied to the transformer, and the output of the full wave rectifying circuit 2 and the input of the first smoothing capacitor 6a; Second terminal 25 drawn from the connection point between the other output of the full-wave rectifying circuit 2 and the input of the second smoothing capacitor 6b, and the first and second smoothing capacitors 6a and 6b. The third and fourth terminals 23 and 26 drawn out from the type force of the adjacent Extending to one point, the first smoothing capacitor 6a and the first high frequency conversion circuit 3 and the second smoothing capacitor 6b and the second high frequency conversion circuit 4 correspond to the input power supply. It consists of a power conversion terminal box (7) interconnected in series or in parallel between the outputs.

The wiring of the power conversion terminal box 7 is connected to the first terminal 22 and the third terminal 23 as shown in FIG. 2 when 220V is input as the input power source 1, and the second terminal. By connecting the busbars 30 so that the 25 and the fourth terminals 26 are connected, the first and second smoothing capacitors 6a and 6b are connected in parallel, and the first and second high frequency conversion circuits ( 3 and 4) are also connected in parallel.

On the other hand, when, for example, 440V is input to the input power, as shown in Figure 3 by connecting the third terminal 23 and the fourth terminal 26 to each other by the bus bar 30, the first and second smoothing The capacitors 6a and 6b are connected in series, and the first and second high frequency conversion circuits 3 and 4 are also connected in series, so that the DC voltage divided by the smoothing capacitors 6a and 6b is divided into the first and second. It is applied to the high frequency conversion circuits 3 and 4, respectively.

 However, the power conversion terminal box 7 of the conventional electric welding machine has to disconnect the copper busbar 30 fixed through the bolt or the like from each terminal when the input voltage is changed, and newly connect and fix it according to the input power. There is a problem.

In addition, when a power is input between the user connecting the busbars 30 according to the input power, there is a problem that a dangerous accident occurs in which the user is electrocuted.

In addition, the power conversion terminal box 7 is configured to be exposed to the outside of the main body of the electric welder to change the input power, there is a problem that a short circuit accident of the exposed terminal occurs.

In addition, the terminals exposed to the outside of the electric welder has a problem that may cause an electric shock accident of the worker passing by.

In order to solve the above problems, an object of the present invention is to provide a power conversion device of an electric welder that is easy to change the input voltage, and can prevent the risk of electric shock of the user when the input voltage is changed.

In order to achieve the above object, the present invention rectifies and converts an input power source into direct current, and connects the first and second capacitors to smooth the ripple voltage of the converted direct current, and is connected to both ends of the first and second capacitors, respectively. In the electric welding machine having a first and a second high frequency conversion unit for generating a high frequency output voltage, the relay for connecting the first capacitor and the first high frequency conversion unit, the second capacitor and the second high frequency conversion unit in series or parallel part; And a switch unit installed at the front of the electric welder to control the relay unit to be connected in series or in parallel according to a switching position.

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The relay unit may further include: a first relay unit for allowing the first capacitor and the first high frequency converter to be connected in series with the second capacitor and the second high frequency converter; And

And a second relay unit for allowing the first capacitor and the first high frequency converter to be connected in parallel with the second capacitor and the second high frequency converter.

In addition, the first relay unit is characterized in that at least one relay is installed.

The second relay unit may include at least two relays, and more preferably, the second relay unit may be installed in multiples of two.

In addition, when the switching position of the switch unit is set to switch on the first relay, the second relay is switched off, and when the switching position of the switch unit is set to switch on the second relay, the first relay It is characterized in that the switching off.

As described above, the power converter of the electric welding machine according to the present invention has an advantage of easily changing the input voltage.

In addition, the power conversion device of the electric welding machine according to the present invention has the advantage of preventing the risk of electric shock of the user when the input voltage changes.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, repetitive description of the same configuration as in the prior art is omitted, and the same reference numerals are used for the same configuration.

Figure 4 is a block diagram schematically showing the configuration of the power converter of the electric welding machine according to the present invention, Figure 5 is a perspective view showing a welding machine to which the converter of the electric welder according to the present invention is applied, Figures 6 and 7 the present invention It is an electric circuit diagram showing a power conversion circuit of the electric welder according to, Figures 8 and 9 are exemplary diagrams showing the voltage setting of the electric welder.

4 to 9, the electric welder 200 according to the present invention rectifies the input power and converts it into direct current, and first and second capacitors 6a and 6b for smoothing the converted ripple voltage of the direct current. And first and second high frequency converters 3 and 4 and voltage converters 100 connected to both ends of the first and second capacitors 6a and 6b, respectively, to generate a high frequency output voltage.

The voltage converter 100 may include a relay unit 120 that connects the first capacitor 6a and the first high frequency converter 3 to the second capacitor 6b and the second high frequency converter 4 in series or in parallel. And a switch unit 110 that controls the relay unit 120 to maintain a series connection or a parallel connection according to the switching position.

The switch unit 110 is configured to set a path so that the first capacitor 6a and the first high frequency converter 3 and the second capacitor 6b and the second high frequency converter 4 are connected in series or in parallel. to be.

The switch unit 110 connects the first capacitor 6a and the first high frequency converter 3 to the second capacitor 6b and the second high frequency converter 4 in series. The relay unit 120 is controlled to maintain the connection state, and the first capacitor 6a and the first high frequency converter 3 are connected in parallel with the second capacitor 6b and the second high frequency converter 4. In this case, the relay unit 120 controls the relay unit 120 to maintain a parallel connection state.

That is, when the switch unit 110 is switched on to maintain the series connection state (ON), the parallel connection is blocked, and when the switch unit 110 is switched on to maintain the parallel connection state, the series connection is blocked.

In addition, the switch unit 110 is installed on the front panel of the electric welder 200 so that the user can easily perform a switching operation, preferably made of a dip switch.

The relay unit 120 may include a first relay unit 130 that connects the first capacitor 6a and the first high frequency converter 3, the second capacitor 6b, and the second high frequency converter 4 in series. And a second relay unit 140 connecting the first capacitor 6a and the first high frequency converter 3 and the second capacitor 6b and the second high frequency converter 4 in parallel.

The first relay unit 130 includes at least one relay L6 and L7. The number of relays installed in the first relay unit 130 may be additionally installed according to the allowable current.

The second relay unit 140 includes at least two relays L1, L2, L3, and L4, and the number of relays installed in the second relay unit 140 may be additionally installed according to the allowable current. If possible, it is installed in multiples of 2.

The following describes the operation of the power conversion device of the electric welding machine according to the present invention.

Before the user uses the electric welder 200, check the input power 1 supplied to the use site, and then operate the switch unit 110 installed on the front panel so that the input power supplied to the electric welder 200 is set. .

When the input power source 1 is, for example, 380V, the switch unit 110 switches the first relay unit 130 on, and the second relay unit 140 switches off the first capacitor 6a. ) And the first high frequency converter 3, the second capacitor 6b and the second high frequency converter 4 are connected in series.

That is, the relay contact 130a of the first relay unit 130 is switched on to maintain the connection connection state, and the relay contact 140a of the second relay unit 140 is switched off to maintain the connection disconnection state.

In addition, when the input power source 1 is, for example, 220V, the switch unit 110 causes the first relay unit 130 to be switched off and the second relay unit 140 to be switched on so that the first capacitor 6a is switched on. ) And the first high frequency converter 3, the second capacitor 6b and the second high frequency converter 4 are connected in parallel.

That is, the relay contact 130a of the first relay unit 130 is switched off to maintain the connection disconnection state, and the relay contact 140a of the second relay unit 140 is switched on to maintain the connection connection state.

Accordingly, when the input voltage is changed, the copper busbars fixed through bolts or the like are separated from the respective terminals, and the input voltage can be easily changed without connecting and fixing the busbars according to the input power.

In addition, even if the power is input while the user changes the setting of the power converter according to the input power, it is possible to prevent a dangerous accident that the user is electric shock.

In addition, it is possible to prevent the exposure of the terminals for changing the input power supply to prevent a short circuit between the terminals.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many as possible without departing from the spirit of the present invention as set forth in the claims below. Changes may be made.

1 is an electrical circuit diagram schematically showing a power conversion circuit of a general electric welding machine.

Figure 2 is an exemplary view showing the voltage setting of the power converter in the conventional electric welding machine.

3 is an exemplary view showing another voltage setting of the power converter in the conventional electric welding machine.

Figure 4 is a block diagram schematically showing the configuration of a power conversion device of the electric welding machine according to the present invention.

5 is a perspective view showing a welder to which the conversion device of the electric welder according to the present invention is applied.

FIG. 6 is an electrical circuit diagram specifically showing the configuration of the power converter of FIG. 4.

7 is an electric circuit diagram showing a power conversion circuit of the electric welding machine according to the present invention.

8 is an exemplary view showing the voltage setting of the electric welder according to the present invention.

9 is an exemplary view showing another voltage setting of the electric welder according to the present invention.

(Symbols for the main parts of the drawing)

100: voltage converter 110: switch unit

120: relay unit 130: first relay unit

130a: contact 140: second relay portion

140a: Contact 200: Welding Machine

Claims (6)

First and second capacitors for rectifying and converting an input power source into direct current, and smoothing the ripple voltage of the converted direct current; and first and second ends connected to both ends of the first and second capacitors, respectively, to generate a high frequency output voltage. In the electric welding machine having a second high frequency conversion unit, A relay unit connecting the first capacitor and the first high frequency converter and the second capacitor and the second high frequency converter in series or in parallel; And And a switch unit installed at the front of the electric welder and controlling the relay unit to be connected in series or parallel according to a switching position. The method of claim 1, The relay unit may include: a first relay unit configured to connect the first capacitor and the first high frequency converter with the second capacitor and the second high frequency converter in series; And And a second relay unit for allowing the first capacitor and the first high frequency converter to be connected in parallel with the second capacitor and the second high frequency converter. delete delete delete The method of claim 2, The second relay is switched off when the switching position of the switch unit is set to switch on the first relay, and the first relay is switched off when the switching position of the switch unit is set to switch on the second relay. Power converter of the electric welder, characterized in that the.

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