KR101076216B1 - Precision machining control apparatus using an igbt circuit, and the control method thereof - Google Patents

Abstract

The present invention relates to a precision machining control device using an IGBT circuit and a control method thereof, comprising: a work table on which a metal to be processed is placed, and cutting means for cutting a metal on the work table using a plasma torch, the cutting means Conveying means for moving the tool in the X-axis direction (horizontal direction of the work table), the Y-axis direction (vertical direction of the work table) or the Z-axis direction (the height direction of the work table) according to the metal working path, which is supplied to the plasma torch In the precision processing control apparatus using the IGBT circuit having a control means for adjusting the pressure of the gas in accordance with the base material or the thickness of the iron plate, the control means for adjusting the pressure of the gas introduced into the torch in accordance with the intensity of the supply current The idle regulator and the current supplied to the idle regulator according to the base material or thickness of the steel sheet to be cut A controller providing a corresponding pulse width modulation (PWM) control signal, a first output driver receiving a PWM control signal from the controller and converting the signal into a gate driving pulse signal of an insulated gate bipolar transistor (IGBT), and the first output driver A second output driver that receives a PWM control signal that is out of phase with the supplied PWM control signal and converts it into a gate drive pulse signal of the IGBT, and is composed of two or more IGBTs to output from the first output driver and the second output driver. And a first IGBT switching unit for synthesizing the gate driving pulse signal, and switching the current supplied to the idle regulator with the synthesized driving pulse signal to adjust the amount of current supplied to the idle regulator to adjust the pressure of the gas introduced into the torch. Can be. The precision machining control device and the control method using the IGBT circuit according to the present invention having such a structure is that when the controller inputs a specific code corresponding to the base material and the thickness of the steel sheet to be processed, the controller is connected to a specific code current Invoke a value from storage. Next, the controller provides a PWM control signal corresponding to the current value to the first output driver and the second output driver. At this time, the phase of the PWM control signal supplied to the first output driver and the second output driver is preferably different from each other. In addition, the first output driver and the second output driver converts the PWM control signal into a control signal that can be recognized by the gate of the IGBT, and then transfers the PWM control signal to the gate terminal of the IGBT respectively connected to the first output driver and the second output driver. do. On the other hand, the two IGBTs can be opened and closed according to the driving pulse signal input to each gate terminal, thereby adjusting the amount of current supplied to the idle regulator. In addition, the controller may convert the current value supplied to the idle regulator by modulating the pulse width of the PWM control signal when the base material of the iron plate or the thickness of the iron plate is to be converted to the amount of current supplied to the idle regulator.

Description

PRECISION MACHINING CONTROL APPARATUS USING AN IGBT CIRCUIT, AND THE CONTROL METHOD THEREOF}

The present invention relates to a precision processing control device using the IGBT circuit and a control method thereof, and more particularly, to adjust the current supplied to the plasma torch in accordance with the input digital value to simplify the plate material according to the material or thickness of the plate material. SUMMARY OF THE INVENTION An object of the present invention is to provide a precision machining control apparatus using an IGBT circuit that can be cut and a control method thereof.

In general, a plasma torch is a device that generates and maintains a plasma arc spark between an electrode and a plate, and provides reactant gas and heat of reaction in a process to which the reactant is applied, resulting in ionization and dissociation of a reactant. To promote this.

Most plasma torches have a structure in which a plasma arc flame is generated between the electrodes, and is maintained by the flow rate and the flow rate of the gas injected between the electrodes. The gas used is compressed air, oxygen, nitrogen, methane, and the like. It is used in various ways depending on the application.

Such a plasma torch has the advantage that the temperature and speed of the plasma can be controlled according to the adjustment of the operating current, the gas flow rate and the flow rate, and the pressure of the supplied gas can be used variously from low pressure to high pressure.

When the plasma torch is electrically divided, it can be classified into a transfered type and a non-transferred type. The transfer plasma torch mainly has a negative charge at a cathode, and a material to be treated is It serves as an anode, and the material must be electrically conductive.

On the other hand, the non-conductive plasma torch has a cathode and an anode embedded in the torch body, the electrical flow is terminated inside the torch, has an electrically neutral arc column, and the plasma temperature decreases rapidly away from the nozzle end. Its efficiency is lower than that of the formula, but it has the advantage of being able to process reactants of insulators.

In addition, the conventional plasma torch is made of a method of controlling the voltage and current of the analog form according to the base material or thickness of the iron plate has a problem that the cutting operation can not be carried out by accurate control.

In addition, although the method of controlling the voltage and current in the analog form as described above is effective in repeatedly cutting the iron plate having the same thickness and the same base material, when the base material or thickness of the iron plate is variously changed, The current value could not be determined and there was a problem in that the operation manual had to be referred to every operation.

Accordingly, the present invention is to solve the problems presented above, if only the unique code input to the work window according to the base material or thickness of the iron plate, the iron plate processing by automatically adjusting the current supplied to the plasma torch according to the base material and thickness of the iron plate to be processed SUMMARY OF THE INVENTION An object of the present invention is to provide a precise machining control apparatus using the IGBT circuit and a control method thereof to minimize the time consumed and the effort required for iron plate processing.

Precision processing control apparatus using the IGBT circuit according to the present invention for achieving the above object is a work table on which the metal to be processed is placed, cutting means for cutting the metal on the work table using a plasma torch, Transport means for moving the cutting means in the X-axis direction (horizontal direction of the work table), Y-axis direction (vertical direction of the work table) or Z-axis direction (height direction of the work table) according to the metal working path, the plasma torch In the precision processing control device using the IGBT circuit having a control means for adjusting the pressure of the gas supplied to the base material or the thickness of the steel sheet, the control means is the pressure of the gas introduced into the torch in accordance with the intensity of the supply current Static regulator to adjust the pressure and supply to the static regulator according to the base material or thickness of the steel plate to be cut Is a controller providing a pulse width modulation (PWM) control signal corresponding to a current, a first output driver receiving a PWM control signal from the controller and converting the PWM control signal into a gate driving pulse signal of an insulated gate bipolar transistor (IGBT), and the first A second output driver that receives a PWM control signal out of phase with the PWM control signal supplied to the output driver and converts the signal into a gate drive pulse signal of the IGBT, and two or more IGBTs. A first IGBT for synthesizing the gate drive pulse signal output from the driver and controlling the pressure of the gas introduced into the torch by controlling the amount of current supplied to the idle regulator by switching the current supplied to the idle regulator with the synthesized drive pulse signal; It may be made of a switching unit.

In addition, the present invention may be equipped with a torch height adjustment unit for adjusting the height interval between the torch electrode and the plate by the voltage adjustment using the negative feedback circuit according to the base material or thickness of the plate to be processed.

The precision machining control device and the control method using the IGBT circuit according to the present invention having such a structure is that when the controller inputs a specific code corresponding to the base material and the thickness of the steel sheet to be processed, the controller is connected to a specific code current Invoke a value from storage.

Next, the controller provides a PWM control signal corresponding to the current value to the first output driver and the second output driver.

At this time, the phase of the PWM control signal supplied to the first output driver and the second output driver is preferably different from each other.

In addition, the first output driver and the second output driver converts the PWM control signal into a control signal that can be recognized by the gate of the IGBT, and then transfers the PWM control signal to the gate terminal of the IGBT respectively connected to the first output driver and the second output driver. do.

On the other hand, the two IGBTs can be opened and closed according to the driving pulse signal input to each gate terminal, thereby adjusting the amount of current supplied to the idle regulator.

In addition, the controller may convert the current value supplied to the idle regulator by modulating the pulse width of the PWM control signal when the base material of the iron plate or the thickness of the iron plate is to be converted to the amount of current supplied to the idle regulator.

Therefore, the precision processing control device and the control method using the IGBT circuit according to the present invention, if a specific code suitable for the iron plate base material and the thickness through the numeric keypad to the controller, the controller is automatically supplied to the idle regulator, With the ability to automatically adjust the amount of current, the operator only has to pay attention to the progress of the cutting of the steel plate and the completeness of the final result.

Therefore, there is an advantage that the worker can effectively handle many tasks.

1 is a perspective view of a CNC plasma model cutting machine equipped with the present invention,
2 is a control circuit diagram of the present invention;
3 is a diagram illustrating a PWM control signal output from TP1 and TP2 and a current output from TP3, TP4 and TP5 shown in FIG.
4 is a view for explaining the function of the first diode and the second diode,
5 is a view for explaining a negative feedback device for automatically adjusting the torch height.

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

As shown in FIG. 1 and FIG. 2, the precision machining control apparatus using the IGBT circuit according to the present invention includes a work table 2 on which a metal to be processed is placed and a metal on the work table 2 with a plasma torch. Cutting means (4) for cutting using the cutting means (4), the cutting means (4) in the X-axis direction (horizontal direction of the work table 2) or Y-axis direction (vertical direction of the work table 2) according to the metal working path Or an IGBT circuit having a conveying means 6 for moving in the Z-axis direction (height direction of the work table 2) and a control means for adjusting the pressure of the gas supplied to the plasma torch according to the base metal or the thickness of the iron plate. In the precision machining control device used, the control means is provided with an idle regulator (1) for adjusting the pressure of the gas introduced into the torch according to the intensity of the supply current, and according to the base material or thickness of the iron sheet to be cut A controller (3) providing a pulse width modulation (PWM) control signal corresponding to the current supplied to the regulator (1), and a gate driving pulse of an insulated gate bipolar transistor (IGBT) received by receiving a PWM control signal from the controller (3). A first output driver 5 converting the signal into a signal and a PWM control signal having a different phase from a PWM control signal supplied to the first output driver 5 are received from the controller 3 and converted into a gate driving pulse signal of the IGBT. Comprising a second output driver 7 and two or more IGBTs to synthesize the gate drive pulse signal output from the first output driver 5 and the second output driver 7 and the idle regulator into a synthesized drive pulse signal ( The first IGBT switching unit 9 for controlling the pressure of the gas introduced into the torch by switching the current supplied to 1) to adjust the amount of current supplied to the idle regulator 1. It may be made of.

In addition, the first IGBT switching unit 9 has an emitter terminal or a gate terminal connected to the first output driver 5 and the emitter terminal is grounded, according to a pulse signal input from the first output driver 5 to the gate terminal. A first IGBT 27 (Insulated Gate Bipolar Transistor) in which the collector stage is opened and closed, and a first coil 29 having an output terminal connected to the collector stage of the first IGBT 27 and an input terminal connected to the idle regulator 1. The second IGBT 31 in which the gate end is connected to the second output driver 7 and the emitter end is grounded so that the emitter end or the collector end is opened and closed according to a pulse signal input from the second output driver 7 to the gate end. (Insulated Gate Bipolar Transistor), and a second drive 33 having an output terminal connected to the collector terminal of the second IGBT 31 and an input terminal connected to the input terminal of the first coil 29, thus combining two driving To the idle regulator (1) according to the pulse signal The current level can be adjusted to be.

At this time, the first coil 29 and the second coil 33 can minimize the ripple of the current supplied to the idle regulator (1).

In addition, when the input terminal and the output terminal of the first diode 35 are connected to the output terminal of the first coil 29 and the output terminal of the rectifier 12, respectively, the emitter terminal and the collector terminal of the first IGBT 27 are opened. The first IGBT 27 is protected, and an input terminal and an output terminal of the second diode 37 are connected to an output terminal of the second coil 33 and an output terminal of the rectifying unit 12, respectively, so that the EMI of the second IGBT 31 is connected. The switch element second IGBT 31 can be protected when the terminal and collector ends are opened.

In addition, the present invention, as shown in Figure 2, the pilot (Pilot) arc generator 11 for generating a plasma arc in accordance with the intensity of the supply current, and the PWM control signal for generating a pilot arc from the controller (3) A third output driver 13 configured to receive the signal and convert it into a gate driving pulse signal of the IGBT, and supplied to the pilot arc generator 11 according to the gate driving pulse signal output from the third output driver 13. It further includes a second IGBT switching unit 15 for switching the current to adjust the amount of current supplied to the pilot arc generator (11).

In addition, the second IGBT switching unit 15 has an emitter end according to a driving pulse signal inputted from the third output driver 13 to the gate end thereof with the gate end connected to the third output driver 13 and the emitter end grounded. Alternatively, a first resistor (3) Insulated Gate Bipolar Transistor (ICVT 17) in which the collector stage is opened and closed, and a first resistor having an output terminal connected to the emitter terminal of the third IGBT 17 and an input terminal connected to the pilot arc generator 11 ( 19), the amount of current input to the pilot arc generator 11 may be adjusted by the pulse width of the driving pulse input from the third output driver 13 to the gate terminal of the third IGBT 17.

In addition, the present invention, as shown in Figure 1, the voltage sensing unit 21 for detecting the voltage supplied to the idle regulator 1 in real time and the current supplied to the idle regulator 1 in real time detection And a monitor 25 for displaying in real time the results detected by the voltage sensing unit 21 and the current sensing unit 23.

Referring to FIGS. 1 to 4, a process of operating the precision processing control apparatus using the IGBT circuit according to the present invention having the above structure will be described below.

First, when a worker inputs a specific code into the controller 3 according to the base material and thickness of the steel plate to be processed, the controller 3 searches for a current value corresponding to the specific code as shown in FIG. The PWM control signals TP1 and TP2 corresponding to the values are provided to the first output driver 5 and the second output driver 7.

The PWM control signals provided to the first output driver 5 and the second output driver 7 preferably have different phase differences at the same frequency.

At this time, when the amount of current supplied to the idle regulator 1 becomes large, the pulse width of the PWM control signal provided from the controller 3 is widened, while if the amount of current supplied to the idle regulator 1 is small, the controller The pulse width of the PWM control signal provided from (3) becomes narrow.

Meanwhile, the first output driver 5 and the second output driver 7 can recognize the PWM control signal transmitted from the controller 3 by the first IGBT 27 and the second IGBT 31. After conversion to the first IGBT 27 and the gate terminal of the second IGBT (31).

In addition, the first IGBT 27 and the second IGBT 31 are opened or closed in accordance with the driving pulse signals supplied from the first output driver 5 and the second output driver 7, and are connected to the idle regulator 1. The amount of current supplied is controlled.

In this case, since the first IGBT 27 and the second IGBT 31 are connected in parallel with the idle regulator 1, the driving pulse signal and the second IGBT 31 input to the gate terminal of the first IGBT 27 are provided. The amount of current supplied to the idle regulator 1 can be adjusted according to the drive pulse signal TP5 obtained by synthesizing the drive pulse signal input to the gate terminal of the gate.

Further, the first coil and the second coil connected to the collector end of the first IGBT 27 and the collector end of the second IGBT 31 have a fall time at the falling edge of the current, as shown in TP3 and TP4 shown in FIG. 3. Delay can reduce current ripple.

In addition, since the first IGBT 27 and the second IGBT 31 are connected in parallel, the first IGBT 27 and the second IGBT 31 are divided by two equal parts by dividing the current flowing through the idle regulator 1. ) Can be prevented from being damaged.

In addition, as shown in FIG. 4, the first diode 35 and the second diode 37 connected to the collector end of the first IGBT 27 and the collector end of the second IGBT 31 are the first IGBT 27. ) And when the second IGBT 31 is opened, the reverse current may be exhausted in the order of ABCD to protect the first IGBT 27 and the second IGBT 31.

In addition, the current sensing unit 23 and the voltage sensing unit 21 may check and display the current and voltage provided to the idle regulator 1 on the monitor 25.

On the other hand, the pilot arc generator 11 generates a pilot arc while adjusting the supply current by the third IGBT 17 switched according to the PWM control signal provided from the controller (3).

On the other hand, the present invention, as shown in Figure 5, the torch height adjustment unit 39 for adjusting the height interval between the torch electrode and the base material by voltage adjustment using a negative feedback circuit according to the thickness of the base material or the base material to be processed is added The torch height adjustment unit 39 may be mounted, and the input unit 41 receives a voltage value matched with a height interval between the torch electrode and the base material transmitted from the controller 3 according to the thickness of the base material and the base material to be processed. And a setting unit 45 that adjusts the height interval between the torch electrode and the base material by using the result value derived by adding or subtracting the voltage value input from the subtractor 51 from the voltage value transmitted from the input unit 41. After detecting the height gap between the current torch electrode and the base material, and then the sensing unit 47 expressing the detected result as a voltage value, the voltage value derived from the sensing unit 47 and from the input unit 41 Adjusting unit 49 for comparing the input voltage value and transferring the comparison result value to the subtraction and subtraction unit 51, and adding or subtracting the comparison result value derived by the adjustment unit 49, and then setting the derived comparison result value It may be made of an addition and subtraction unit 51 to deliver to the unit (45).

On the other hand, the precision machining control method using the IGBT circuit according to the present invention, as shown in Figure 1, the work table 2 is placed on the metal to be processed, and the metal placed on the work table 2 plasma torch Cutting means 4 to cut using the cutting means 4, the cutting means 4 in the X-axis direction (horizontal direction of the work table 2) or Y-axis direction (vertical direction of the work table 2) according to the metal working path or An IGBT circuit having a conveying means 6 for moving in the Z-axis direction (height direction of the work table 2) and a control means for adjusting the pressure of the gas supplied to the plasma torch according to the base metal or the thickness of the iron plate; In the precision machining control method used, the idle regulation 1 provided in the control means adjusts the pressure of the gas introduced into the torch according to the intensity of the supply current, and the controller 3 According to the base material or the thickness of the steel plate to provide a PWM control signal corresponding to the current supplied to the idle regulator, the first output driver 5 receives the PWM control signal from the controller 3 receives the gate drive pulse signal of the IGBT The process of converting to.

In addition, in the precision machining control method using the IGBT circuit, the second output driver 7 receives a PWM control signal that is out of phase with the PWM control signal supplied to the first output driver 5 from the controller 3 so as to provide a gate of the IGBT. The first IGBT switching unit 9 composed of two or more IGBTs synthesizes a gate driving pulse signal output from the first output driver 5 and the second output driver 7 and synthesizes the driving pulse signal. And controlling the pressure of the gas introduced into the torch by controlling the amount of current supplied to the idle regulator 1 by switching the current supplied to the idle regulator 1 with a driving pulse signal.

The precision machining control device and the control method using the IGBT circuit according to the present invention having such a structure is that when the controller 3 inputs a specific code corresponding to the base material and the thickness of the steel sheet to be processed, the controller 3 is The current value linked to the specific code is called from the storage.

Next, the controller 3 provides a PWM control signal corresponding to the current value to the first output driver 5 and the second output driver 7.

At this time, it is preferable that the phases of the PWM control signals supplied to the first output driver 5 and the second output driver 7 are different from each other.

In addition, the first output driver 5 and the second output driver 7 converts the PWM control signal into a control signal that can be recognized by the gate of the IGBT, and then the first output driver 5 and the second output driver. It is transferred to the gate end of the IGBT respectively connected to (7).

On the other hand, the two IGBTs can be opened and closed according to the driving pulse signal input to each gate terminal, thereby adjusting the amount of current supplied to the idle regulator 1.

In addition, the controller 3 is supplied to the idle regulator 1 by modulating the pulse width of the drive pulse control signal when the base material of the iron plate or the thickness of the iron plate is to be converted and the amount of current supplied to the idle regulator 1 should be converted. Current value can be converted.

Therefore, the precision machining control device using the IGBT circuit and the control method thereof according to the present invention simply inputs a specific code suitable for the iron plate base material and thickness to the controller 3 through the numeric keypad, and the controller 3 automatically turns idle. Since the amount of voltage and current supplied to the regulator 1 can be automatically adjusted, the operator only has to pay attention to the progress of the cutting of the steel plate and the completeness of the final result.

Therefore, there is an advantage that the worker can effectively handle many tasks.

1. Static regulator 2. Working table
3. Controller 4. Cutting Means
5. 1st output driver 6. Vehicle
7. Second output driver 9. First IGBT switching unit
11. Pilot Arc Generator 13. Third Output Driver
15. Second IGBT Switching Unit 17. Third IGBT
19. First resistor 21. Voltage sensing unit
23. Current sensing unit 25. Monitor
27. First IGBT 29. First Coil
31. 2nd IGBT 33. 2nd Coil
35. First Diode 37. Second Diode
39. Torch height adjustment part 41. Input part
43. Addition and subtraction part 45. Setting part
47. Sensor 49. Controller
51. Addition and subtraction department

Claims (9)

A work table 2 on which a metal to be processed is placed;
Cutting means (4) for cutting the metal on the work table (2) using a plasma torch;
The cutting means 4 is moved in the X-axis direction (horizontal direction of the work table 2), Y-axis direction (vertical direction of the work table 2) or Z-axis direction (work table 2) according to the metal working path. Conveying means 6 for moving in the height direction);
In the precision processing control device using the IGBT circuit having a control means for adjusting the pressure of the gas supplied to the plasma torch in accordance with the base material or thickness of the iron plate,
The control means includes an idle regulator (1) for adjusting the pressure of the gas introduced into the torch according to the intensity of the supply current,
A controller (3) for providing a pulse width modulation (PWM) control signal corresponding to the current supplied to the idle regulator 1 according to the base material or thickness of the iron plate to be cut;
A first output driver (5) receiving a PWM control signal from the controller (3) and converting it into a gate driving pulse signal of an Insulated Gate Bipolar Transistor (IGBT);
A second output driver (7) for receiving a PWM control signal that is out of phase with the PWM control signal supplied to the first output driver (5) from the controller (3) and converting it into a gate drive pulse signal of the IGBT;
And two or more IGBTs for synthesizing the gate driving pulse signals output from the first output driver 5 and the second output driver 7 and switching the current supplied to the idle regulator 1 with the synthesized driving pulse signals. And a first IGBT switching unit (9) for adjusting the pressure of the gas introduced into the torch by adjusting the amount of current supplied to the idle regulator (1).
The method of claim 1,
Further comprising a pilot arc generator 11 for generating a plasma arc in accordance with the strength of the supply current,
A third output driver (13) for receiving a PWM control signal for generating a pilot arc from the controller (3) and converting it into a gate driving pulse signal of an IGBT;
And a second configured to adjust the amount of current supplied to the pilot arc generator 11 by switching the current supplied to the pilot arc generator 11 according to the gate driving pulse signal output from the third output driver 13. Precision processing control device using the IGBT circuit, characterized in that consisting of the IGBT switching unit (15).
The method of claim 2,
The second IGBT switching unit 15 has an emitter terminal or a collector in accordance with a driving pulse signal inputted from the third output driver 13 to the gate terminal of which the gate terminal is connected to the third output driver 13 and the emitter terminal is grounded. A third IGBT 17 (Insulated Gate Bipolar Transistor) in which the stage is opened and closed;
An output stage is composed of a first resistor (19) connected to the emitter stage of the third IGBT (17) and the input stage is connected to a pilot arc generator (11),
Precision machining using the IGBT circuit, characterized in that the amount of current input to the pilot arc generator 11 is adjusted by the pulse width of the drive pulse input from the third output driver 13 to the gate terminal of the third IGBT 17. controller.
The method of claim 1,
A voltage sensing unit 21 for detecting a voltage supplied to the idle regulator 1 in real time;
A current sensing unit 23 for detecting in real time the current supplied to the idle regulator 1;
And a monitor (25) for displaying in real time the results detected by the voltage sensing unit (21) and the current sensing unit (23). The method of claim 1,
The first IGBT switching unit 9 has an emitter end or a collector end according to a pulse signal inputted from the first output driver 5 to the gate end with a gate terminal connected to the first output driver 5 and the emitter terminal grounded. The first IGBT 27 (Insulated Gate Bipolar Transistor) to be opened and closed;
A first coil 29 having an output terminal connected to the collector terminal of the first IGBT 27 and an input terminal connected to the idle regulator 1;
A second IGBT 31 having a gate end connected to the second output driver 7 and an emitter end grounded so that the emitter end or collector end is opened and closed in response to a pulse signal input from the second output driver 7 to the gate end ( Insulated Gate Bipolar Transistor);
And a second coil 33 having an output terminal connected to the collector terminal of the second IGBT 31 and an input terminal connected to the input terminal of the first coil 29.
Precision processing control device using the IGBT circuit, characterized in that the amount of current supplied to the idle regulator (1) is adjusted in accordance with the synthesized two drive pulse signals.
6. The method of claim 5,
When the input terminal and the output terminal of the first diode 35 are connected to the output terminal of the first coil 29 and the output terminal of the rectifier 12, respectively, the emitter terminal and the collector terminal of the first IGBT 27 are opened. 1 protects the IGBT 27,
When the input terminal and the output terminal of the second diode 37 are connected to the output terminal of the second coil 33 and the output terminal of the rectifier 12, respectively, the emitter terminal and the collector terminal of the second IGBT 31 are opened. 2 Precision processing control device using the IGBT circuit, characterized in that to protect the IGBT (31).
The method of claim 1,
Torch height adjustment unit 39 is mounted to adjust the height interval between the torch electrode and the base material by voltage adjustment using a negative feedback circuit according to the thickness of the base material or the base material to be processed,
The torch height adjusting unit 39 includes an input unit 41 which receives a voltage value matched with a height interval between the torch electrode and the base material transmitted from the controller 3 according to the thickness of the base material and the base material to be processed;
A setting unit 45 for adjusting a height interval between the torch electrode and the base material by using the result value obtained by adding or subtracting the voltage value input from the subtracting unit 43 from the voltage value transmitted from the input unit 41;
A sensing unit 47 for sensing a height gap between the current torch electrode and the base material and then expressing the detected result as a voltage value;
An adjusting unit (49) for comparing the voltage value derived from the sensing unit (47) with the voltage value input from the input unit (41) and transferring the comparison result value to the addition / subtraction unit (43);
And an addition / subtraction unit 51 which adds or subtracts the comparison result value derived by the adjusting unit 49 and then transfers the derived comparison result value to the setting unit 45. Process control device.
A work table 2 on which a metal to be processed is placed;
Cutting means (4) for cutting the metal on the work table (2) using a plasma torch;
The cutting means 4 is moved in the X-axis direction (horizontal direction of the work table 2), Y-axis direction (vertical direction of the work table 2) or Z-axis direction (work table 2) according to the metal working path. Conveying means 6 for moving in the height direction);
And a control means for controlling the pressure of the gas supplied to the plasma torch according to the base metal and the thickness of the iron plate, the precision machining control method using the IGBT circuit,
The idle regulator 1 provided in the control means adjusts the pressure of the gas introduced into the torch according to the intensity of the supply current,
The controller 3 is to provide a PWM control signal corresponding to the current supplied to the idle regulator according to the base material or thickness of the iron plate to be cut,
The first output driver 5 receives the PWM control signal from the controller 3 and converts it into a gate driving pulse signal of the IGBT.
The second output driver 7 receives a PWM control signal out of phase with the PWM control signal supplied to the first output driver 5 from the controller 3 and converts it into a gate driving pulse signal of the IGBT.
The first IGBT switching unit 9 composed of two or more IGBTs synthesizes the gate driving pulse signals output from the first output driver 5 and the second output driver 7 and regenerates the idle regulator 1 with the synthesized driving pulse signals. By controlling the current supplied to the idle regulator (1) by switching the current supplied to the precision machining control method using an IGBT circuit.
The method of claim 8,
The first IGBT switching unit 9 has an emitter end or a collector end according to a pulse signal inputted from the first output driver 5 to the gate end with the gate end connected to the first output driver 5 and the emitter end grounded. The first IGBT 27 (Insulated Gate Bipolar Transistor) to be opened and closed;
A first coil 29 having an output terminal connected to the collector terminal of the first IGBT 27 and an input terminal connected to the idle regulator 1;
A second IGBT 31 having a gate end connected to the second output driver 7 and an emitter end grounded so that the emitter end or collector end is opened and closed in response to a pulse signal input from the second output driver 7 to the gate end ( Insulated Gate Bipolar Transistor);
And a second coil 33 having an output terminal connected to the collector terminal of the second IGBT 31 and an input terminal connected to the input terminal of the first coil 29.
A method for precise machining control using an IGBT circuit, characterized in that the amount of current supplied to the idle regulator (1) is adjusted according to the synthesized two driving pulse signals.

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