KR100935008B1 - Device for selecting electricity power in the inverter welding machine - Google Patents

Abstract

PURPOSE: A power selection apparatus for an inverter welding machine is provided to control the serial or parallel connection of an inverter and the voltage supplied to a second circuit unit generating a PWN signal by a selection switch in one time according to the common electricity. CONSTITUTION: A power selection apparatus for an inverter welding machine is composed of a down transformer(40), a bridge diode(50), a selection switch(60), a first relay unit(70), a second circuit unit(80), and a second relay unit(90). The input voltage is transformed to the AC voltage by the down transformer. The AC voltage is transformed to the DC voltage through a bridge diode. The DC voltage is provided to one of three relays(Ry3) and is supplied to the second circuit unit by the relay turned on. The serial or parallel connection of a first high-frequency wave circuit(21) and a second high-frequency wave circuit(25) is decided by the second relay unit.

Description

Power selector for inverter welding machine {DEVICE FOR SELECTING ELECTRICITY POWER IN THE INVERTER WELDING MACHINE}

The present invention relates to a power selector for an inverter welding machine, and more particularly, when the selection switch is selected according to any one of 220 V, 380 V or 440 V power input to the rectifying part of the power supply, by the selection switch. A power supply selection device for an inverter welder controlled together with a first relay unit for selecting a voltage supplied to a secondary circuit unit for generating a PWM signal and a second relay unit for selecting a series or parallel connection of the inverter unit.

Republic of Korea Patent No. 10-0716267 (registered May 2, 2007) "inverter power converter for electric welding machine" is introduced.

The inverter welding power converter for the electric welder is connected to a rectifier circuit for rectifying the input power into a direct current, the first and second capacitors, and both ends of the first and second capacitors in parallel to generate a high frequency output voltage. First and second high frequency conversion circuits and a power switching device for switching input power, the first terminal of the power switching device, the second terminal of the rectifier circuit, the third terminal of the first capacitor portion, the fourth terminal of the In the inverter power switching device for an electric welder connected to each of the two capacitors and configured to switch power to the connector, the fifth and six terminals formed in parallel with the third and fourth terminals of the power switching device are connected to each other. When the input power is connected to 440V, the third terminal and the fifth terminal are connected by the connector, and the fourth terminal and the sixth terminal are connected by the connector.

However, the inverter power switching device for the electric welder is to be able to manually adjust only the power supplied to the inverter, the secondary circuit unit for transmitting a pulse width modulation signal (PWM) to the insulated-gate bipolar transistor (IGBT) of the inverter A separate switch device is required to adjust the power provided by the controller, and the power supplied to the inverter unit and the power supplied to the secondary circuit unit cannot be controlled at a time.

Republic of Korea Patent No. 10-0855543 (registered August 26, 2008) introduces the "power supply of the inverter welding machine using the SR."

The power supply of the inverter welding machine using the SRC includes three pairs of SCRs arranged to face different directions for converting 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 element for generating a high voltage square wave voltage according to an input voltage or a voltage fed back from the rear end of the SCR; And an IGBT element composed of a switching element driven by the control of the CPU and a high voltage transformer to convert the phase angle converted voltage by the SCR into a high voltage square wave output voltage.

However, the power supply of the inverter welding machine using the SCR has no mention of a switch device for adjusting the power supplied to the secondary circuit portion for generating a PWM signal, and when controlling the power supplied to the secondary circuit portion from the CPU However, there is a risk that an error may occur in the PWM signal output due to the voltage variation.

In addition, "Power conversion device of a power-saving inverter welding machine" and Korean Utility Model Registration No. 20-0358227 (July 28, 2004) introduced in Korean Patent Application No. 20-2008-0014308 (filed Oct. 28, 2008) In the "inverter power supply for electric welding machine" introduced in the work registration), a method of controlling the supply power of the secondary circuit portion for generating the PWM signal is not introduced.

Accordingly, an object of the present invention is to supply to the secondary circuit unit for generating a PWM signal by the selection switch when the selection switch is selected according to any one of the 220V, 380V or 440V power source input to the rectifier of the power supply is made commercial power By controlling the first relay unit for selecting the voltage to be applied and the second relay unit for selecting the series or parallel connection of the inverter unit, the voltage supplied to the series or parallel connection of the inverter and the secondary circuit unit can be selected by one selection switch operation. It is to provide a power selector for an inverter welding machine.

In order to achieve the above object, the power supply device for an inverter welding machine according to the present invention converts an input voltage into an AC voltage of 0V to 24V by a down transformer, and supplies the AC voltage to the bridge diode. AC voltage is converted into a DC voltage by the input, DC voltage is input to a selection switch operated by a user, and the DC switch is provided to any one of three relays constituting the first relay unit, When the relay provided with the DC voltage is turned on, the input voltage is supplied to the secondary circuit portion for generating the PWM signal through the turned-on relay, and the operation of the second relay portion is controlled by the selection switch, and by the second relay portion. Series or parallel of the first high frequency conversion circuit and the second high frequency conversion circuit constituting the inverter unit of the power supply Characterized in that the connection is determined.
When the commercial power supply is 440V, the selection switch inputs a DC voltage of 24V to 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 connected by the first movable terminal. The DC voltage of 24V is output from the first output terminal, the second input terminal and the fourth output terminal are electrically connected by the second movable terminal, and the voltage of 24V is output from the fourth output terminal.
When the commercial power supply is 380V, the selection switch inputs a DC voltage of 21V to the first input terminal and the second input terminal by the turning switch, and the first input terminal and the second output terminal are connected to each other by the first movable terminal. Electrically connected, a DC voltage of 21 V is output from the second output terminal, and a second input terminal and a fifth output terminal are electrically connected by the second movable terminal to connect a fourth output terminal electrically connected to the fifth output terminal. The output is 21V.
In addition, when the commercial power supply is 220V, the selection switch inputs a DC voltage of 12V to the first input terminal and the second input terminal by the turning switch, and the first input terminal and the third output terminal are connected to each other by the first movable terminal. Is electrically connected, and outputs a DC voltage of 12 V from the third output terminal, and 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. Characterized in that no output from the terminal to the outside.

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The first relay unit is composed of three relays, and the switch of the first relay is turned on so that a voltage of 12 V output from the third output terminal of the selector switch is supplied to the coil of the first relay so that an input voltage of 220 V is applied to the first relay unit. The output of the relay is switched to the secondary circuit through a switch of the relay, and a voltage of 21 V output from the second output terminal of the selector switch is supplied to the coil of the second relay so that the switch of the second relay is turned on so that an input voltage of 380 V is applied to the second circuit. It is output to the secondary circuit through the switch of the relay, the voltage of 24V output from the first output terminal of the selector switch must be supplied to the coil of the first relay, the switch of the first relay is turned on, the input voltage of 440V It is characterized in that the output through the relay switch to the secondary circuit portion.

The second relay unit is composed of two relays working together. When the operating voltage is not applied to the coil of the relay, the c 'terminal and the a' terminal of the fourth relay are electrically connected as well as the b 'of the fifth relay. When the terminal and the d 'terminal are electrically connected and the operating voltage is applied to the coil of the relay, the c' terminal, the a 'terminal, the b' terminal and the d 'terminal is short-circuited, the c' terminal and the fifth terminal of the fourth relay The b 'terminal of the relay is characterized in that it is electrically connected by the movable terminal.

Thereby, the power source selection device for inverter welding machine according to the present invention can select the voltage supplied to the series or parallel connection of the inverter and the secondary circuit part by one selection switch operation, so that the power source selection is convenient.

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

Referring to FIG. 1, in general, the power supply of the inverter welding machine includes a primary rectifier 10 for converting a commercial AC power of 60 Hz into a DC power, and a DC power converted into the primary rectifier 10 at a high frequency. An inverter unit 20 for converting to an AC power source, a high frequency transformer 30 for boosting a high frequency AC power converted by the inverter unit 20 to a predetermined welding voltage, and a stepped up unit by the high frequency transformer 30 And a secondary rectifier (not shown) for rectifying the AC power back to DC.

In the power supply device of the inverter welding machine configured as described above, since the commercial AC power is input at any one of 220V, 380V, or 440V, the IGBT (Q1,) of the inverter unit 20 corresponds to the voltage of the commercial AC power input. Q2, Q3, Q4 selects the voltage input to the secondary circuit unit 90 to provide a PWM signal to the gates (G1, G2, G3, G4) of the insulated-gate bipolar transistor (Q2), and responds to a commercial AC power supply In order to apply a voltage to the inverter unit 20, a series or parallel connection between the first high frequency conversion circuit 21 and the second high frequency conversion circuit 25 constituting the inverter unit 20 should be selected.

Therefore, the power source selection device for an inverter welder according to the present invention is configured to configure the inverter unit 20 at the same time that the voltage supplied to the secondary circuit unit 80 is selected by the selection switch 60 operated manually by the user. A series or parallel connection of the first high frequency conversion circuit 21 and the second high frequency conversion circuit 25 can be selected.

1 and 2, in the power supply selection device for an inverter welder according to the present invention, the input voltage Vo is converted into an AC voltage of 0V to 24V by the down transformer 40, and the AC voltage is converted into a bridge diode ( 50), the AC voltage is converted into a DC voltage by the bridge diode 50, and the DC voltage is input to a selection switch 60 operated by a user, and the DC switch is selected by the selection switch 60. Since the voltage is provided to any one of the three relays Ry1, Ry2, Ry3 constituting the first relay unit 70, and the relay provided with the DC voltage is turned on, the relay having the input voltage Vo turned on. The second circuit unit 80 is supplied to the secondary circuit unit 80, the operation of the second relay unit 90 is controlled by the selection switch 60, and the second relay unit 90 configures the inverter unit 20. The series of one high frequency conversion circuit 21 and the second high frequency conversion circuit 25 It is determined in the parallel connection.

Referring to FIG. 3, the connection state of the selection switch 60 is illustrated. (A) is a selection switch connected when the commercial power is 440V, and (B) is a selection switch when the commercial power is 380V. Is in the connected state, and (C) is the selection switch is connected when the commercial power is 220V.

That is, the selection switch 60, as shown in (a), when the commercial power supply is 440V, 24V to the first input terminal 64a and the second input terminal 64b by the turning switch 61. DC voltage is inputted, and 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 is applied at the first output terminal 65a. The second input terminal 64b and the fourth output terminal 66a are electrically connected to each other by the second movable terminal 63, and a voltage of 24 V is output from the fourth output terminal 66a. And, as shown in (b), when the commercial power source is 380V, a DC voltage of 21V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, and The first input terminal 64a and the second output terminal 65b are electrically connected to each other by the first movable terminal 62 so as to output a DC voltage of 21 V 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 by 63, so that a voltage of 21 V is output through the fourth output terminal 66a electrically connected to the fifth output terminal 66b. do. In addition, as shown in (c), when the commercial power source is 220V, a DC voltage of 12V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, and The first input terminal 64a and the third output terminal 65c are electrically connected by the first movable terminal 62 so as to output a DC voltage of 12V from the third output terminal 65c, and the second movable terminal ( The second input terminal 64b and the sixth output terminal 66c are connected to each other by 63. However, since the conductor is not connected to the sixth output terminal 66c, the sixth output terminal 66c is outputted to the outside. none.

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Referring to FIG. 2 again, the first relay unit 70 includes three relays Ry1, Ry2, and Ry3, and the voltage of 12V output from the third output terminal 65c of the selector switch 60 is increased. The switch of the first relay Ry1 is turned on only when supplied to the coil of the first relay Ry1, and an input voltage Vo of 220V is output to the secondary circuit unit 80 through the switch of the first relay Ry1. When the voltage of 21V output from the second output terminal 65b of the selector switch 60 is supplied to the coil of the second relay Ry2, the switch of the second relay Ry2 is turned on, so that the input voltage Vo of 380V is applied. ) Is output to the secondary circuit unit 80 through the switch of the second relay Ry2, the voltage of 24V output from the first output terminal 65a of the selector switch 60 is the coil of the first relay Ry1. The switch of the first relay Ry2 is turned on only when the switch is turned on, and the input voltage Vo of 440V is output to the secondary circuit unit 80 through the switch of the third relay Ry2.

Referring back to FIG. 1, the secondary circuit unit 80 includes a down transformer 81 for stepping down the voltage output from the first relay unit 70, and a PWM corresponding to the signal output from the down transformer 81. PWM circuit section 82 for generating a signal.

For example, when the secondary circuit unit 80 receives 220V (or 380V, 440) from the first relay unit 70 to the down transformer 81, 12V (or 19V, 24V) is input from the down transformer 81. ) Is stepped down and input to the PWM circuit unit 82, and generates a PWM signal corresponding to 12V (or 19V, 24V) in the PWM circuit unit 82, IGBT (Q1, Q2, Q3, By outputting to the gates G1, G2, G3, and G4 of Q4), the output voltage of the high frequency transformer 30 is determined.

Referring to FIG. 2 again, the second relay unit 90 is composed of two relays Ry4 and Ry5 operating together, and when the operating voltage is not applied to the coils of the relays Ry4 and Ry5, The c 'terminal and the a' terminal of the relay Ry4 are electrically connected as well as the b 'terminal and the d' terminal of the fifth relay Ry5 are electrically connected to each other, and the operating voltage is applied to the coils of the relays Ry4 and Ry5. If approved, the c 'terminal, the a' terminal, the b 'terminal and the d' terminal are short-circuited, and the c 'terminal of the fourth relay Ry4 and the b' terminal of the fifth relay Ry5 are connected to the movable terminal 91. By electrical connection.

The c 'terminal of the fourth relay Ry4 is connected to the c terminal of the power supply shown in FIG. 1, the a' terminal is connected to the a terminal of the power supply, and the b 'terminal of the fifth relay Ry5 is connected. It is connected to the b stage of the power supply shown in Figure 1, the d 'terminal is connected to the d stage of the power supply.

The operation of the power selector for the inverter welding machine according to the present invention configured as described above will be described with reference to FIGS. 4 to 6.

When the commercial power source is 220V, as shown in FIG. 4, the user operates the selection switch 60 to correspond to 200V. That is, the first input terminal 64a and the third output terminal 65c are electrically connected, so that a DC voltage of 12V is output from the third output terminal 65c, and the second input terminal 64b and the sixth output. Although the terminal 66c is connected, since no conducting wire is connected to the sixth output terminal 66c, nothing is output from the sixth output terminal 66c to the outside. As a result, the input voltage Vo is provided to the secondary circuit portion 80 through the turned-on first relay Ry1, while no voltage is supplied to the second relay portion 90, so that the c 'terminal and a The terminal 'b' and the terminal d 'are electrically connected to each other, and 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. 20) is applied a voltage of 220V.

When the commercial power source is 380V, as shown in FIG. 5, the user operates the selector switch 60 to correspond to 380V. That is, the first input 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 movable terminal 63 causes the second to be output. 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, by this, the input voltage Vo is provided to the secondary circuit portion 80 through the turned-on second relay Ry2, while the operating voltage of 21 V is supplied to the coil of the second relay portion 90. And the c 'terminal and the b' terminal are electrically connected by the movable terminal 91 so that the first high frequency conversion circuit 21 and the second high frequency conversion circuit 25 of the inverter unit 20 are connected in series. As a result, a voltage of 380 V is applied to the inverter unit 20.

When the commercial power source is 440V, as shown in FIG. 6, the user manipulates the selection switch 60 to correspond to 440V. That is, the first input terminal 64a and the first output terminal 65a are electrically connected to each other, the DC voltage of 24 V is output from the first output terminal 65a, and the second movable terminal 63 causes the second voltage to be output. 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. Thereby, by this, the input voltage Vo is provided to the secondary circuit portion 80 through the turned-on third relay Ry2, while the operating voltage of 24 V is supplied to the coil of the second relay portion 90. Supplied, and the c 'terminal and the b' terminal are electrically connected by the movable terminal 91, so that the first high frequency conversion circuit 21 and the second high frequency conversion circuit 25 of the inverter unit 20 are connected in series. As a result, a voltage of 440 V is applied to the inverter unit 20.

As described above, the power selector for the inverter welding machine according to the present invention by operating the selection switch once in accordance with the commercial power source, the voltage supplied to the secondary circuit unit for generating a PWM signal and the series connection or parallel to the inverter unit You can adjust the connection.

1 is a block diagram showing a power supply device according to the present invention schematically shown with a power supply device of the inverter welding machine.

2 is a circuit diagram showing a power selection device according to the present invention.

Figure 3 shows the connection state of the selection switch, (a) is the selection switch is connected when the power for tkd is 440V, (b) is the selection switch is connected when the commercial power is 380V, (C) shows the selection switch 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 the commercial power input to the power supply device in the power selection device according to the present invention.

Claims (4)

The input voltage Vo is converted into an AC voltage of 0V to 24V by the down transformer 40, the AC voltage is supplied to the bridge diode 50, and the AC voltage is converted into a DC voltage by the bridge diode 50. Three relays Ry1, Ry2, which are converted, and the DC voltage is input to the selection switch 60 operated by the user, and the DC voltage constitutes the first relay unit 70 by the selection switch 60; Ry3) is provided to any one of the relay, the relay is provided with a DC voltage is turned on, the input voltage (Vo) is supplied to the secondary circuit portion 80 for generating a PWM signal through the turned-on relay, the selection switch ( The operation of the second relay unit 90 is controlled by 60, and the first high frequency conversion circuit 21 and the second high frequency which constitute the inverter unit 20 of the power supply device are controlled by the second relay unit 90. The serial or parallel connection of the conversion circuit 25 is determined Power selection device for an inverter welding machine in which. The method of claim 1, The selection switch 60 is When the commercial power source is 440V, a 24V DC voltage is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, and the first input by the first movable terminal 62. The terminal 64a and the first output terminal 65a are electrically connected to each other, a 24V DC voltage is output from the first output terminal 65a, and the second input terminal 64b is driven by the second movable terminal 63. And the fourth output terminal 66a are electrically connected, and a voltage of 24 V is output from the fourth output terminal 66a. When the commercial power source is 380V, a DC voltage of 21V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, and the first input by the first movable terminal 62. 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 driven by the second movable terminal 63. And the fifth output terminal 66b are electrically connected to each other, and a voltage of 21 V is output through the fourth output terminal 66a electrically connected to the fifth output terminal 66b. When the commercial power source is 220V, a DC voltage of 12V is input to the first input terminal 64a and the second input terminal 64b by the turning switch 61, and the first input by the first movable terminal 62. The terminal 64a and the third output terminal 65c are electrically connected to each other, the DC voltage of 12 V is output from the third output terminal 65c, and the second input terminal 64b is driven by the second movable terminal 63. And the sixth output terminal 66c are connected, but since no wire is connected to the sixth output terminal 66c, no power is output from the sixth output terminal 66c to the outside. . The method of claim 1, 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 selector switch 60 is applied to the first relay Ry1. The switch of the first relay Ry1 is turned on only when supplied to the coil, so that an input voltage Vo of 220V is output to the secondary circuit unit 80 through the switch of the first relay Ry1, and the selection switch 60 When the voltage of 21V output from the second output terminal 65b is supplied to the coil of the second relay Ry2, the switch of the second relay Ry2 is turned on so that the input voltage Vo of 380V is supplied to the second relay Ry2. ) Is output to the secondary circuit unit 80 through the switch of the switch, and a voltage of 24 V output from the first output terminal 65a of the selector switch 60 must be supplied to the coil of the first relay Ry1 so that the first relay ( The switch of Ry2) is turned on, and the input voltage Vo of 440V is output to the secondary circuit unit 80 through the switch of the third relay Ry2. Appointed power selection device. The method of claim 1, The second relay unit 90 is composed of two relays Ry4 and Ry5 operating together. When the operating voltage is not applied to the coils of the relays Ry4 and Ry5, c 'of the fourth relay Ry4 is applied. When not only the terminal and the a 'terminal are electrically connected, but also the b' terminal and the d 'terminal of the fifth relay Ry5 are electrically connected and the operating voltage is applied to the coils of the relay Ry4 and Ry5, the c' terminal The a 'terminal, the b' terminal and the d 'terminal are short-circuited, and the c' terminal of the fourth relay Ry4 and the b 'terminal of the fifth relay Ry5 are electrically connected by the movable terminal 91. Power selector for inverter welding machine.

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