KR20180089612A - Power selector for inverter welding machine - Google Patents

Abstract

The present invention relates to a power selection device for an inverter welding machine, to simultaneously control a first relay unit to select voltage supplied to a secondary circuit unit for generating a pulse wave modulation (PWM) signal and a second relay unit to select a serial or parallel connection with an inverter unit by a selection switch. According to the present invention, an input voltage (Vo) is transformed into an AC voltage of 0 to 24 V by a down-transformer (40), and the AC voltage is supplied to a bridge diode (50) to be converted into a DC voltage. The DC voltage is inputted to the selection switch (60) operated by a user, and is provided to any one of three relays (Ry1, Ry2, Ry3) forming a first relay unit (70) by the selection switch (60), such that the relay receiving the DC voltage is turned on. Thus, the input voltage (Vo) is supplied to the secondary circuit unit (80) for generating the PWM signal through the turned-on relay, operation of the second relay unit (90) is controlled by the selection switch (60), and the serial or parallel connection between the first and second high frequency conversion circuits (21, 25) forming the inverter unit (20) of the power supply unit is determined by the second relay unit (90).

Description

[0001] The present invention relates to a power selector for an inverter welding machine,

The present invention relates to a power source selecting device for an inverter welding machine, and more particularly, to a power source selecting device for selecting a power source for a power source, such as a 220V, 380V, or 440V power source, The present invention relates to a power source selection device for an inverter welding machine, which controls a first relay part for selecting a voltage supplied to a secondary circuit part for generating a PWM signal and a second relay part for selecting a series or parallel connection of the inverter part.

Korean Patent No. 10-0716267 (registered on May 2, 2007) introduces an "inverter power inverter for electric welding machine ".

The rectifier circuit for rectifying the input power and converting the rectified input power into direct current, a first and a second condenser unit, and a second and a third condenser unit connected in parallel at both ends of the first and second condenser units to generate a high- Frequency conversion circuit and a power supply switching device for switching the input power supply, wherein the first terminal and the second terminal of the power switching device are a rectifying circuit, the third terminal is a first condenser section, and the fourth terminal is a And the second and fourth terminals of the power switching device are connected to the first and second capacitors, respectively, so that power is switched between the first and second capacitors, The third terminal and the fifth terminal are connected to the connection port when the input power is connected at 440 V, and the fourth terminal and the sixth terminal are connected to the connection port.

However, since the inverter power source switching device for the electric welding machine can manually adjust only the power supplied to the inverter, it transmits the PWM signal (pulse width modulation signal) to the inverter IGBT (insulated-gate bipolar transistor) There is a disadvantage in that a separate switching device for adjusting the power supplied to the secondary circuit part is required and the power supplied to the inverter part and the power supplied to the secondary circuit part can not be controlled at a time.

Korean Patent No. 10-0855543 (registered on Aug. 26, 2008) introduces "power supply device of inverter welder using ESCAR".

The power supply of the inverter welder using the S-SE is composed of three pairs of SCRs arranged in different directions to convert the phase angle of the input voltage of 110V, 380V or 440V; A CPU for generating a gate signal for selectively driving the three pairs of SCRs and a driving signal of a switching device for generating a square-wave voltage of a high voltage according to an input voltage or a voltage fed back from the rear end of the SCR; And an IGBT element which is composed of a switching element driven by the control of the CPU and a high-voltage transformer and converts the phase-angle-converted voltage by the SCR into a square-wave output voltage of high voltage.

However, the power supply device of the inverter welder using the SCR does not refer to a switch device for adjusting the power supplied to the secondary circuit part that generates the PWM signal. When controlling the power supplied from the CPU to the secondary circuit part , There is a risk that an error may occur in the PWM signal output due to the voltage fluctuation.

In addition, a power converter of a power-saving inverter welder, which is disclosed in Korean Patent Application No. 20-2008-0014308 (filed on October 28, 2008) and Korean Utility Model Registration No. 20-0358227 28-day registration) does not disclose a method for controlling the power supply of the secondary circuit for generating the PWM signal in the "inverter power supply device for electric welding machine".

Accordingly, it is an object of the present invention to provide a secondary circuit unit that generates a PWM signal by a selection switch when a selection switch is selected according to any one of 220V, 380V, or 440V power sources input to a rectifying unit of a power supply unit And a second relay unit for selecting a series connection or a parallel connection of the inverter unit are controlled together so that the voltage supplied to the serial or parallel connection of the inverter and the secondary circuit unit is controlled by one selection switch operation And a power selection device for the inverter welding machine.

According to an aspect of the present invention, there is provided a power source selection device for an inverter welding machine, wherein an input voltage is converted to an AC voltage of 0V to 24V by a down-transformer, the AC voltage is supplied to a bridge diode, The alternating voltage is converted into a direct current voltage by the diode, the direct voltage is inputted to the selection switch operated by the user, and the direct current voltage is supplied to one of the three relays constituting the first relay portion And the relay provided with the DC voltage is turned on so that the input voltage is supplied to the secondary circuit portion which generates the PWM signal via the turned on relay and the operation of the second relay portion is controlled by the selection switch, Frequency conversion circuit and the second high-frequency conversion circuit constituting the inverter section of the power supply device by the first and second high- And the column connection is determined.

When the commercial power source is 440 V, the selection switch receives DC voltage of 24 V from the first input terminal and the second input terminal by the turning switch, and the first input terminal and the first output terminal are electrically A DC voltage of 24 V is output from the first output terminal, a second input terminal and the fourth output terminal are electrically connected by the second movable terminal, and a voltage of 24 V is output from the fourth output terminal.

When the commercial power source is 380 V, the selection switch receives a DC voltage of 21 V from the first input terminal and the second input terminal by the turning switch, and the first input terminal and the second output terminal And a fourth output terminal electrically connected to the fifth output terminal is electrically connected to the second input terminal and the fifth output terminal by a second movable terminal to output a DC voltage of 21 V from the second output terminal A voltage of 21 V is output.

In addition, when the commercial power source is 220 V, the selection switch has a turning switch for inputting a DC voltage of 12 V to the first input terminal and the second input terminal, and the first input terminal and the third output terminal The second input terminal and the sixth output terminal are connected by the second movable terminal, but the sixth output terminal is not connected to the sixth output terminal, so that the sixth output And no terminal is output to the outside.

The first relay part is composed of three relays. When a voltage of 12V outputted from the third output terminal of the selection switch is supplied to the coil of the first relay, the switch of the first relay is turned on, A voltage of 21 V output from the second output terminal of the selection switch is supplied to the coil of the second relay so that the switch of the second relay is turned on so that the input voltage of 380 V is supplied to the second- The voltage of 24 V output from the first output terminal of the selection switch is supplied to the coil of the first relay so that the switch of the first relay is turned on so that the input voltage of 440 V is supplied to the secondary circuit through the switch of the second relay, 3 relay switch to the secondary circuit unit.

When the operating voltage is not applied to the coil of the relay, not only the terminal c 'and the terminal a' of the fourth relay are electrically connected but also the terminal b 'of the fifth relay is electrically connected, Terminal and d 'terminal are electrically connected and the operating voltage is applied to the coil of the relay, the terminals c' and a 'and the terminals b' and d 'are short-circuited, and the terminal c' And the b 'terminal of the relay is electrically connected by the movable terminal.

The power source selection device for the inverter welding machine according to the present invention can select the voltage to be supplied to the inverter circuit in series or parallel connection and the secondary circuit part by a single selection switch operation.

1 is a configuration diagram showing a power supply device of an inverter welder and a power supply selection device according to the present invention.
2 is a circuit diagram showing a power selection device according to the present invention.
Fig. 3 shows the wiring state of the selection switch. Fig. 3 (a) shows a state in which the selection switch is connected when the power source for tkd is 440 V, Fig. 3 (b) shows a state in which the selection switch is connected when the commercial power source is 380 V, (C) shows that the selection switch is connected when the commercial power is 220V.
4 to 6 illustrate an example in which the first relay unit and the second relay unit are operated by selecting a selection switch corresponding to a commercial power source input from the power source selection apparatus according to the present invention to a power source.

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

Referring to FIG. 1, generally, a power supply apparatus for an inverter welding machine includes a first rectifying unit 10 for converting a commercial AC power source of 60 Hz to a DC power source, and a second rectifying unit 10 for converting a DC power source converted into the first rectifying unit 10 into a high- A high frequency transformer (30) for boosting an alternating current power of a high frequency converted by the inverter section (20) to a predetermined welding voltage, and a high frequency transformer And a secondary rectifying part (not shown) for rectifying the boosted AC power again to DC.

Since the power source of the inverter welder configured as described above is supplied with either the commercial AC power of 220 V, 380 V, or 440 V, the IGBTs Q 1 and Q 2 of the inverter unit 20, G2, G3 and G4 of the insulated-gate bipolar transistors Q1, Q2, Q3 and Q4 to be supplied to the secondary circuit unit 90 so as to supply the PWM signal to the gates G1, G2, G3 and G4 of the insulated- It is necessary to select the series connection or the parallel connection of the first high-frequency conversion circuit 21 and the second high-frequency conversion circuit 25 constituting the inverter section 20 so that the voltage is applied to the inverter section 20 correspondingly.

Therefore, in the power source selecting device for an inverter welding machine according to the present invention, the voltage supplied to the secondary circuit portion 80 is selected by the selection switch 60 operated by the user manually, and at the same time, Frequency conversion circuit 21 and the second high-frequency conversion circuit 25 can be selected in series or in parallel.

1 and 2, an apparatus for selecting a power source for an inverter welding machine according to the present invention is characterized in that an input voltage Vo is converted to an AC voltage of 0V to 24V by a down-transformer 40, and the AC voltage is applied to a bridge diode 50, the AC voltage is converted into a DC voltage by the bridge diode 50, the DC voltage is inputted to a selection switch 60 operated by the user, and the selection switch 60 is connected to the DC A voltage is supplied to any one of the three relays Ry1, Ry2 and Ry3 constituting the first relay part 70 so that the relay provided with the DC voltage is turned on so that the relay in which the input voltage Vo is turned on The operation of the second relay unit 90 is controlled by the selection switch 60 and the output of the second relay unit 90 is controlled by the second relay unit 90, Frequency conversion circuit 21 and the second high-frequency conversion circuit 25 in series Or a parallel connection is determined.

3 shows a connection state of the selection switch 60. In FIG. 3, (A) shows a state where the selection switch is connected when the commercial power is 440 V, (B) shows a state when the commercial power is 380 V The switch is in the connected state. (C) The selection switch is connected when the commercial power is 220V.

That is, as shown in (A), when the commercial power source is at 440V, the selection switch 60 is turned by the turning switch 61 to the first input terminal 64a and the second input terminal 64b The first input terminal 64a and the first output terminal 65a are electrically connected to each other by the first movable terminal 62 so that the DC voltage of 24V from the first output terminal 65a The second input terminal 64b and the fourth output terminal 66a are electrically connected by the second movable terminal 63 and a voltage of 24V is outputted from the fourth output terminal 66a. As shown in (b), when the commercial power source is at 380 V, a DC voltage of 21 V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, The first input terminal 64a and the second output terminal 65b are electrically connected by the first movable terminal 62 so that a DC voltage of 21 V is output from the second output terminal 65b and the second movable terminal The second input terminal 64b and the fifth output terminal 66b are electrically connected to each other through the fourth output terminal 66b electrically connected to the fifth output terminal 66b by the second output terminal 66b, do. As shown in (c), when the commercial power source is 220 V, a DC voltage of 12 V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, The first input terminal 64a and the third output terminal 65c are electrically connected by the first movable terminal 62 and the DC voltage of 12V is outputted from the third output terminal 65c and the second movable terminal 63 are connected to the second input terminal 64b and the sixth output terminal 66c but are not connected to the sixth output terminal 66c so that they are outputted to the outside from the sixth output terminal 66c There is nothing.

2, the first relay unit 70 includes three relays Ry1, Ry2, and Ry3, and a voltage of 12V output from the third output terminal 65c of the selection switch 60 The switch of the first relay Ry1 must be turned on to supply the coil of the first relay Ry1 so that the input voltage Vo of 220 V is output to the secondary circuit unit 80 through the switch of the first relay Ry1 And the voltage of 21 V output from the second output terminal 65b of the selection switch 60 is supplied to the coil of the second relay Ry2 so that the switch of the second relay Ry2 is turned on so that the input voltage of 380 V The voltage Vo is output to the secondary circuit unit 80 through the switch of the second relay Ry2 and the voltage of 24V output from the first output terminal 65a of the selection switch 60 is output to the first relay Ry1 The switch of the first relay Ry2 is turned on and the input voltage Vo of 440 V is outputted to the secondary circuit unit 80 through the switch of the third relay Ry2.

1, the secondary circuit unit 80 includes a down transformer 81 for reducing the voltage output from the first relay unit 70 and a down transformer 81 for outputting a signal corresponding to the signal output from the down transformer 81 And a PWM circuit unit 82 for generating a PWM signal.

For example, when the 220V (or 380V, 440) is inputted to the down transformer 81 from the first relay unit 70, the secondary circuit unit 80 outputs 12V (or 19V, 24V Q2, Q3, and Q4 of the inverter unit 20, and outputs the PWM signals to the IGBTs Q1, Q2, Q3, and Q4 of the inverter unit 20. The PWM circuit unit 82 generates PWM signals corresponding to 12V (or 19V, 24V) G2, G3, and G4 of the high-frequency transformer 30 to the gates G1, G2, G3, and G4 of the high-frequency transformer 30.

Referring to FIG. 2 again, the second relay unit 90 is composed of two relays Ry4 and Ry5 that operate together. When no operating voltage is applied to the coils of the relays Ry4 and Ry5, The b 'terminal and the d' terminal of the fifth relay Ry5 are electrically connected as well as the terminal c 'and the terminal a' of the relay Ry4 are electrically connected to each other, and the operation of the coils of the relays Ry4 and Ry5 The terminal c 'of the fourth relay Ry4 and the terminal b' of the fifth relay Ry5 are short-circuited to the movable terminal 91 As shown in Fig.

The terminal 'c' of the fourth relay Ry4 is connected to the terminal c of the power supply shown in FIG. 1, the terminal a 'is connected to the terminal a of the power supply, and the terminal b' Is connected to the b-terminal of the power supply shown in Fig. 1, and the terminal d 'is connected to the d-terminal of the power supply.

The operation of the power source selecting apparatus for an inverter welding machine according to the present invention will be described with reference to FIGS. 4 to 6. FIG.

When the commercial power source is 220V, as shown in Fig. 4, the user manipulates the selection switch 60 to correspond to 200V. That is, the first input terminal 64a and the third output terminal 65c are electrically connected, a DC voltage of 12V is output from the third output terminal 65c, and the second input terminal 64b and the sixth output The terminal 66c is connected, but no lead is connected to the sixth output terminal 66c, so that there is no output to the outside from the sixth output terminal 66c. As a result, the input voltage Vo is supplied to the secondary circuit unit 80 via the first relay Ry1 turned on, while the voltage is not supplied to the second relay unit 90, the first high-frequency conversion circuit 21 and the second high-frequency conversion circuit 25 of the inverter unit 20 are connected in parallel to each other to electrically connect the b 'terminal and the d' terminal, And a voltage of 220 V is applied to the capacitor 20.

When the commercial power is 380 V, the user operates the selector switch 60 to correspond to 380 V as shown in Fig. That is, the first input terminal 64a and the second output terminal 65b are electrically connected, a DC voltage of 21V is output from the second output terminal 65b, and the second movable terminal 63 The input terminal 64b and the fifth output terminal 66b are electrically connected to each other and a voltage of 21V is output through the fourth output terminal 66a electrically connected to the fifth output terminal 66b. Thereby, the input voltage Vo is supplied to the secondary circuit unit 80 through the second relay Ry2 turned on, while the operating voltage of 21 V is supplied to the coil of the second relay unit 90 The first high frequency conversion circuit 21 and the second high frequency conversion circuit 25 of the inverter unit 20 are connected in series by connecting the terminals c 'and b' And a voltage of 380 V is applied to the inverter unit 20. [

When the commercial power source is 440 V, the user manipulates the selection switch 60 to correspond to 440 V, as shown in FIG. That is, the first input terminal 64a and the first output terminal 65a are electrically connected, a DC voltage of 24V is output from the first output terminal 65a, and the second movable terminal 63 The input terminal 64b and the fourth output terminal 66a are electrically connected and a voltage of 24V is output from the fourth output terminal 66a. As a result, the input voltage Vo is supplied to the secondary circuit unit 80 through the third relay Ry2 turned on, while the operating voltage of 24 V is supplied to the coil of the second relay unit 90 Frequency conversion circuit 21 and the second high-frequency conversion circuit 25 of the inverter unit 20 are connected in series with each other by electrically connecting the terminal c 'and the terminal b' And a voltage of 440 V is applied to the inverter unit 20.

As described above, the power source selecting device for the inverter welding machine according to the present invention operates the selection switch once by the user in accordance with the commercial power source, so that the voltage supplied to the secondary circuit part for generating the PWM signal, The column connection can be adjusted.

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Claims (4)

The input voltage Vo is converted to an AC voltage of 0 V to 24 V by the down transformer 40 and the AC voltage is supplied to the bridge diode 50. The AC voltage is converted by the bridge diode 50 into a DC voltage And the DC voltage is input to the selection switch 60 operated by the user and the DC voltage is applied to the three relays Ry1 and Ry2 constituting the first relay unit 70 by the selection switch 60 And Ry3 and the relay provided with the DC voltage is turned on so that the input voltage Vo is supplied to the secondary circuit unit 80 that generates the PWM signal through the relay that is turned on, The operation of the second relay part 90 is controlled by the position 60 and the first high frequency conversion circuit 21 and the second high frequency conversion circuit 21 constituting the inverter part 20 of the power supply device are controlled by the second relay part 90, It is to be noted that the serial or parallel connection of the two high-frequency conversion circuits 25 is determined Power selection device for an inverter welding machine as ranging.
The method according to claim 1,
The selection switch (60)
A DC voltage of 24 V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61 when the commercial power is 440 V and the DC voltage of 24 V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, The terminal 64a and the first output terminal 65a are electrically connected to each other so that a DC voltage of 24 V is output from the first output terminal 65a and the second input terminal 64b is excited by the second movable terminal 63, And the fourth output terminal 66a are electrically connected to each other, a voltage of 24V is output from the fourth output terminal 66a,
A DC voltage of 21 V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61 when the commercial power is 380 V and the DC voltage of 21 V is inputted to the first input terminal 64a and the second input terminal 64b by the turning switch 61, The terminal 64a and the second output terminal 65b are electrically connected to each other so that a DC voltage of 21 V is output from the second output terminal 65b and the second input terminal 64b is excited by the second movable terminal 63, And the fifth output terminal 66b are electrically connected to each other and a voltage of 21V is outputted through the fourth output terminal 66a electrically connected to the fifth output terminal 66b,
A DC voltage of 12V is inputted to the first input terminal 64a and the second input terminal 64b by the turning switch 61 when the commercial power is 220V and the DC voltage of 12V is inputted to the first input terminal 64a and the second input terminal 64b by the turning switch 61, The terminal 64a and the third output terminal 65c are electrically connected to each other so that a DC voltage of 12V is output from the third output terminal 65c and the second input terminal 64b is connected to the second movable terminal 63, And the sixth output terminal 66c is connected to the sixth output terminal 66c and the sixth output terminal 66c is not connected to the sixth output terminal 66c. Device.
The method according to claim 1,
The first relay unit 70 is composed of three relays Ry1, Ry2 and Ry3 and the voltage of 12V outputted from the third output terminal 65c of the selection switch 60 is connected to the first relay Ry1 The switch of the first relay Ry1 is turned on so that the input voltage Vo of 220 V is outputted to the secondary circuit unit 80 through the switch of the first relay Ry1 and the The voltage of 21V output from the second output terminal 65b is supplied to the coil of the second relay Ry2 so that the switch of the second relay Ry2 is turned on and the input voltage Vo of 380V is supplied to the second relay Ry2 And a voltage of 24 V output from the first output terminal 65a of the selection switch 60 is supplied to the coil of the first relay Ry1 so as to be supplied to the first relay The input voltage Vo of 440 V is output to the secondary circuit unit 80 through the switch of the third relay Ry2, Power folding selected equipment.
The method according to claim 1,
The second relay unit 90 is composed of two relays Ry4 and Ry5 that operate together. When the operating voltage is not applied to the coils of the relays Ry4 and Ry5, the c ' Terminal and the a 'terminal are electrically connected to each other, as well as the b' terminal and the d 'terminal of the fifth relay Ry5 are electrically connected. When the operating voltage is applied to the coils of the relays Ry4 and Ry5, And the terminal a 'and the terminal b' and the terminal d 'are short-circuited and the terminal c' of the fourth relay Ry4 and the terminal b 'of the fifth relay Ry5 are electrically connected by the movable terminal 91 Features a power selection device for inverter welder.

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