KR101227440B1 - Power control circuit of lift magnet for transferring iron plate - Google Patents

Abstract

PURPOSE: A power control circuit of a lifting magnet for transporting steel sheets is provided to maximize the reliability and durability on the power circuit of the lifting magnet control device for transporting the steel sheets by using a contactless IGBT element. CONSTITUTION: A power control circuit of a lifting magnet for transporting steel sheets comprises a contactless switching circuit, a digital input circuit part(CIR_101), a MICOM(U201), and an IGBT driver circuit(CIR_410). The contactless switching circuit comprises multiple IGBT elements to drive lifting magnets for transporting steel sheets(LOAD_1-LOAD_5). The digital input circuit part insulates external control signals for controlling the lifting magnets for transporting steel sheets and comprises a buffer circuit for removing noise from insulation signals and stabilizing output signals. The MICOM responses the external control signals inputted from the digital input circuit to supply the control signals for driving the lifting magnets to the contactless switching circuit and controls supply voltage to the lifting magnets to absorb back the high pressure electromotive force surge voltage of the lifting magnets. The IGBT driver circuit drives the IGBT elements of the contactless switching circuit according to the control signals of the MICOM and detects the overload state of the IGBT elements to control the MICOM.

Description

POWER CONTROL CIRCUIT OF LIFT MAGNET FOR TRANSFERRING IRON PLATE}

The present invention relates to a lifting magnet power control, and more particularly, by operating the power control of the lifting magnet for iron plate transfer based on the digital signal, by performing a separate power supply control of the square magnet using a contactless element, The present invention relates to a power control circuit of a lifting magnet for transporting a steel plate, which can prevent a fall accident during the transportation of a steel plate.

Lifting magnet for iron plate transfer is a device for detaching the steel sheet on the magnet crane. More specifically, after transferring the steel sheet attached to the magnet disk to the transfer position, it is easy to remove the electromagnet and the steel sheet by using an auxiliary electromagnet when releasing the current applied to the electromagnet and hoisting the hoist. It is an apparatus for preventing a steel plate from falling down while a steel plate adheres and winds up by the residual magnetic force of an electromagnet.

In general, during the heavy plate manufacturing process, the magnet is lifted by the magnet overhead crane that transfers the steel plate, and then the hoist is hoisted. It is happening frequently.

Then, the structure of the lifting magnet as described in the accompanying patent document will be described with reference to FIG. 1.

As shown in the drawing, the lifting magnet 1 has a casing 10 made of steel, and a plurality of chambers 13 are formed by the iron plate 11, and the cores 20 are disposed at the centers of the chambers 13, respectively. The solenoids 40 fitted to the cores 20 are electrically connected in parallel.

The casing 10 has a lead box 15 for supplying power to an upper outer surface thereof, and a ring 17 for hanging a chain or the like on the left and right sides of the lead box 15 is disposed. The core 20 is fixed to the upper surface of the casing 10 by welding. The solenoid 40 has a coil 43 wound around a first cylindrical insulator 41 made of a fiber material, and then the coil 43 is covered by a second cylindrical insulator 45 made of fiber material, and an insulating tape ( 45 is taped throughout solenoid 40.

The first cylindrical insulator 41 has a stopper portion formed at an upper end and a lower end of the outer circumferential surface to define a range in which the coil 43 is wound. The first and second insulating plates 31 and 33 may be insulating panels, commonly referred to as "mica".

In the conventional lifting magnet 1 configured as described above, when power is applied to the solenoid 40, the core 20 has the polarity of the N pole and the casing 10 of the S pole, and thus, the magnet has a strong magnetic force as a whole. When the adsorbed material such as an iron plate is attached to the electromagnet, the impact is not transmitted directly to the coil 43, and the coil 43 is the cylindrical insulators 41 and 45 and the insulating plate 31 even when the temperature of the adsorbed material is high. , 33), the heat to be adsorbed by the insulating resin 50 is not transmitted to the coil 43.

However, as described above, the conventional lifting magnet transmits a work instruction in the ground cab, and in the PLC (Programmable Logic Controller) of the crane, after laying down the steel plate and releasing the electromagnet current, the program logic (regardless of the detachment state of the steel plate) As the hoist is hoisted by the program logic, a problem occurs that the steel plate falls down while the steel sheet is attached to the electromagnet by the residual magnetic force of the electromagnet, and the program logic can realistically recognize the detached state of the steel sheet. The problem is that it is not possible.

In addition, the steel plate having a smaller weight is attached to the electromagnet, which is attached to the electromagnet to be lifted up or rolled up, so that a large amount of the steel plate is damaged, and in the case of a manual magnet crane, the steel plate attached to the electromagnet by residual magnetic force is lumbered, etc. Problems such as deterioration of work efficiency due to dangerous operations such as desorption by hitting will occur.

1. Republic of Korea Patent Registration 10-0624740, registered date September 08, 2006, application number 10-2006-0041959, application date May 10, 2006, the name of the invention 'lifting magnet'.

The present invention was created to solve such a problem, and an object of the present invention is to construct a high-performance digital control circuit using a microprocessor and a peripheral IC, so as to replace a contactless type IGBT element for lifting for transporting a sheet. An object of the present invention is to provide a power control circuit of a lifting magnet for transferring a steel plate, which can maximize reliability and durability of a power circuit of a magnet controller.

Another object of the present invention is to precisely control and operate a plurality of magnets based on digital control, to thoroughly prevent industrial accidents such as falling accidents during iron plate transfer, and to prevent downtime of factory automation in advance. An object of the present invention is to provide a power control circuit of a lifting magnet for transporting sheet steel, which may contribute to productivity improvement.

Another object of the present invention, by means of a digital circuit instead of a PLC control device as a means for controlling the magnet, by controlling the power supplied to the magnet in an optimal state to minimize the life span of the installation and maintenance costs In addition, the present invention provides a power control circuit of a lifting magnet for transporting sheet steel that can reduce manufacturing costs as much as possible.

In order to achieve the above object, a power control circuit of a lifting magnet for transporting a sheet steel according to an aspect of the present invention is a digital circuit for performing power control of lifting magnets LOAD_1 to LOAD_5 for transporting a sheet metal, and lifting for transporting a sheet metal. A solid state switching circuit composed of a plurality of IGBT elements for driving the magnets LOAD_1-LOAD_5; A digital input circuit unit configured to perform isolation of an external control signal for controlling the lifting magnets for loading the iron plate (LOAD_1 to LOAD_5), and to remove noise from the insulation signal and stabilize the output signal; In response to an external control signal input from the digital input circuit, a control signal for driving the lifting magnets LOAD_1-LOAD_5 is supplied to the solid state switching circuit, and a high voltage state with respect to the lifting magnets LOAD_1-LOAD_5. A microcomputer U201 for controlling a supply voltage to the lifting magnets LOAD_1 to LOAD_5 to absorb a back EMF surge voltage; And an IGBT driver circuit for driving the IGBT elements of the contactless switching circuit according to the control signal of the microcomputer U201, and detecting an overload state of the plurality of IGBT elements and notifying the microcomputer U201. It is done.

According to a preferred embodiment of the present invention, a plurality of IGBT devices are connected in parallel with the lifting magnets LOAD_1 to LOAD_5 to absorb surge voltage of counter electromotive force generated when the DC power in a forward direction is turned off. (IGBT2B, IGBT4B, IGBT6B, IGBT8B, IGBT10B); And a plurality of IGBT elements (IGBT1B, IGBT3B, IGBT5B, IGBT7B, and IGBT9B) for absorbing surge voltage of the counter electromotive force generated when the DC power in the reverse direction is turned off.

The power control circuit of the lifting magnet for iron plate transfer proposed in the present invention provides an effect that can maximize the reliability and durability of the power circuit of the lifting magnet control apparatus for iron plate transfer replaced by a contactless type IGBT element. In addition, in the present invention, by precisely controlling and operating a plurality of magnets based on digital control, it is possible to thoroughly prevent safety accidents at the industrial site, such as falling accidents during steel plate transfer, and to prevent the occurrence of downtime of factory automation in advance. There is an effect that can contribute to improvement.

1 is a view for explaining a conventional lifting magnet.
2 is a view showing a contactless switching circuit according to the present invention.
3 is a view showing an input signal isolation circuit according to the present invention.
4 and 5 are views showing a microcomputer circuit according to the present invention.
6 illustrates an IGBT driver circuit according to the present invention.

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

2 is a view showing a contactless switching circuit for driving a lifting magnet for transferring a sheet steel applied in the present invention. As shown, the forward DC power input terminal (MP) to which the DC power is supplied; A plurality of IGBT elements (IGBT1A, IGBT3A, IGBT5A, IGBT7A, and IGBT9A) connected in series to the input terminal (MP) and configured to switch on / off of a direct current DC power source; Connected in series with the elements IGBT1A, IGBT3A, IGBT5A, IGBT7A, and IGBT9A, and have square magnets LOAD_1, LOAD_2, LOAD_3, LOAD_4 and LOAD_5; A plurality of IGBT elements (IGBT2A, IGBT4A, IGBT6A, IGBT8A, IGBT10A) connected in series with the loads LOAD_1, LOAD_2, LOAD_3, LOAD_4, and LOAD_5 to turn on and off reverse DC power. And a reverse DC power input terminal MN.

In this case, a plurality of IGBT elements are connected in parallel with the magnets LOAD_1, LOAD_2, LOAD_3, LOAD_4, and LOAD_5 to absorb surge voltage of counter electromotive force generated when the DC power in a forward direction is turned off. (IGBT2B, IGBT4B, IGBT6B, IGBT8B, IGBT10B) and magnets (LOAD_1-LOAD_5) are connected in parallel, and many to absorb the surge voltage of the counter electromotive force generated when the DC power in the reverse direction is OFF. IGBT elements (IGBT1B, IGBT3B, IGBT5B, IGBT7B, and IGBT9B) are further included.

Accordingly, the switching circuit using the IGBT element receives a switching control signal for individually driving the magnets LOAD_1, LOAD_2, LOAD_3, LOAD_4 and LOAD_5. The input of the switching control signal is provided through a gate terminal of the IGBT element, and the IGBT element is turned on or off according to the switching signal of the microcomputer to be described below.

3 is a diagram illustrating an input signal insulation circuit unit interoperating with the microcomputer circuit provided in the present invention. As shown, this is to digitally control the power circuit with high performance, and can individually turn on and off the power supplied to the plurality of magnets LOAD_1, LOAD_2, LOAD_3, LOAD_4 and LOAD_5. And a connector CN_102 connected to an external ON / OFF switch, and to insulate a plurality of input signals IN_CH01, IN_CH02, IN_CH03, IN_CH04, IN_CH05 and minimize noise. The digital input circuit CIR_101 and the buffer IC element U101 for stabilizing the output signal of the digital input circuit CIR_101 are comprised.

Therefore, a plurality of input signals input to the digital input circuit CIR_101 are supplied to the buffer IC element U101 in an insulated state. At this time, a pull-up resistor AR101 is connected between the digital input circuit CIR_101 and the buffer IC element U101 to provide stability of the signal.

The U102 device, which is not described, is a connector (CN_101) for connecting external DC power (DC12V, DC12V_GND) and an input / output isolated DC power converter (DC-DC) for converting the external DC power (DC12V, DC12V_GND) to an internal DC power (DC5V). Conveter) (U102) circuit. The DC power converter U102 converts and outputs an input power source to a rated power source of 5V, and the rated power source includes a digital input circuit CIR_101 and a buffer IC element U101 and is used as a power source for the following digital circuit operations. .

4 and 5 are diagrams illustrating a microcomputer circuit according to the present invention. The microcomputer circuit controls the contactless switching circuit for driving the magnet shown in FIG. 2. The microcomputer circuit operates for the magnet operation through the IGBT driver circuit to be described later. The rated power supply is programmed to control the supply.

The microcomputer U201 stores and manages a program for controlling magnets in an internal memory, and the program controls switching operations of the magnets LOAD_1 to LOAD_5 and consumes power remaining in the magnet in the switching switching process. Control algorithm. That is, after the turn-on control is performed to operate the magnet and the turn-off control is performed to stop the magnet operation, after the magnet turn-on, the supply current of the magnet is temporarily reversed in the turn-off process to remain in the magnet itself. It is to exhaust the current and eliminate the surge voltage caused by back EMF.

Therefore, as the electromagnetic force of the magnet is maintained from the current remaining in the magnet, it is to prevent the lifting error in the sheet conveyance exaggeration in advance. That is, when the current supply in the magnet is cut off, a reverse voltage is instantaneously added to induce stable operation of the magnet. This effectively absorbs the high-voltage surge voltage.

The microcomputer U201 is interfaced with a plurality of output signals DI_CH01, DI_CH02, DI_CH03, DI_CH04, and DI_CH05 of the buffer IC device U101 shown in FIG. 3, and a plurality of the microcomputer U201. IC devices U202, U203, U301, and U302 for buffering the output signals DO_CH01, DO_CH02, DO_CH03, DO_CH04, DO_CH05, DO_OV01, DO_OV02, DO_OV03, DO_OV04, and DO_OV05. And a plurality of buffer IC elements U303 and U304 for inverting and stabilizing output signals DO_CH01, DO_CH02, DO_CH03, DO_CH04, and DO_CH05, and the plurality of buffer IC elements U301 and U302. The output signal of the resistors (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10) and multiple LEDs (LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9 And connected in series with the LED 10 to display the output signal states of the plurality of buffer IC elements U301 and U302.

That is, a random port of the microcomputer U201 is allocated to receive a switching signal provided from the digital input circuit CIR_101, and another port of the microcomputer U201 is assigned to output a control signal for magnet control. The circuit arrangement is made to enable LED display of the output signal.

For example, the output signal of the buffer IC element U101 is input to the P1 port P1 of the microcomputer U201. The magnet driving algorithm mounted in the internal memory of the microcomputer U201 is activated in response to the output signal of the buffer IC element U101. As described above, the magnet driving algorithm is activated by a reverse voltage supply including switching on / off of the magnet. Operate to remove the magnet residual current. This effectively absorbs the high voltage counter electromotive surge voltage.

The control algorithm of the microcomputer U201 controls a plurality of IGBT circuits to be operated through the P0 port. In addition, the PO port of the microcomputer U201 is connected in parallel with the LED driving circuit for monitoring the microcomputer operating state, that is, the control state, so that a plurality of LEDs are operated through the buffer IC elements U301 and U302.

On the other hand, the P2 port of the microcomputer (U201) is used as an input port for receiving the overload state of the system, the microcomputer (U201) detects this when an excessive load occurs in the magnet driving process, thereby inducing stable driving of the system To do this. The buffer IC element U204 connected to the P2 port of the microcomputer U201 receives a signal corresponding to an overload condition from an IGBT driver circuit to be described below.

The input and output ports of the microcomputer U201 described above may vary depending on the program design or the type of the microcomputer, and thus the port setting will not change the technical gist of the present invention.

6 illustrates an IGBT driver circuit for driving the plurality of IGBT elements according to a control signal of the microcomputer U201. The IGBT driver circuit CIR_401 drives and controls a plurality of IGBT elements for operation control of the magnet in response to the control signal of the microcomputer U201, and notifies the microcomputer U201 of the overload state of the plurality of IGBT elements. .

To this end, the IGBT driver circuit CIR_401 is provided with logic for performing IGBT control according to the control signal of the microcomputer U201. The IGBT driver circuit CIR_401 measures a change in the amount of current supplied through each logic in an overload condition when a reference value is exceeded. Contains logic to generate the signal.

Accordingly, the IGBT driver circuit CIR_401 has output signals of the plurality of buffer IC elements U202, U203, U303, and U304 that are input signals IG1A, IG1B, IG2A, IG2B, IG3A, and IG3B of the IGBT driver circuit CIR_401. IG4A, IG4B, IG5A, IG5B, IG6A, IG6B, IG7A, IG7B, IG8A, IG8B, IG9A, IG9B, IG10A, IG10B, and output signals from the IGBT driver circuit (CIR_401) , IG1B_E2, IG2A_C1, IG2A_G1, IG2A_E1, IG2B_G2, IG2B_E2, IG3A_C1, IG3A_G1, IG3A_E1, IG3B_G2, IG3B_E2, IG4A_C1, IG4A_G1, IG4A_E1, IG4B_G2, IG4B_E2, IG5A_C1, IG5A_G1, IG5A_E1, IG5B_G2, IG5B_E2, IG6A_C1, IG6A_G1, IG6A_E1, IG6B_G2 , IG6B_E2, IG7A_C1, IG7A_G1, IG7A_E1, IG7B_G2, IG7B_E2, IG8A_C1, IG8A_G1, IG8A_E1, IG8B_G2, IG8B_E2, IG9A_C1, IG9A_G1, IG9A_E1, IG9B_G2, IG9B_E2, IG10A_C1, IG10A_G1, IG10A_E1, IG10B_G2, IG10B_E2) includes a plurality of external IGBT element Connected with.

In addition, a circuit is connected to a plurality of connectors CN_1, CN_2, CN_3, CN_4, CN_5, CN_6, CN_7, CN_8, CN_9, CN_10 for connection between the IGBT driver circuit CIR_401 and the IGBT element.

At this time, a plurality of fault signals DI_F01, DI_F02, DI_F03, DI_F04, and DI_F05 of the plurality of IGBT element driving circuits CIR_401 are input to a buffer IC element U204, and the IC elements U204 The output signal is finally interfaced to the microcomputer U201.

Then, the operation of the present invention will be described based on the accompanying drawings.

First, the microcomputer U201 receives an external switching signal and individually supplies power to a plurality of magnets LOAD_1, LOAD_2, LOAD_3, LOAD_4, and LOAD_5, which are square magnets (electromagnets) that are applied as lifting magnets for iron plate transfer. Enables ON and OFF control.

That is, for example, when the external switch (or button) connected to the connector CN_102 is turned on to turn on the power supplied to the magnet LOAD_1, the digital input circuit CIR_101 is turned on. The input signal IN_CH01 is turned on, and the input signal IN_CH01 outputs a low signal stabilized by a strong signal to noise by the buffer IC element U101, Interface to the microcomputer U201.

In this case, the microcomputer U201 outputs the output signal DO_CH01 to 0V by using a software program, that is, outputs a low signal to output the plurality of buffer IC elements U202 and U203. Input to the U303, U304, the output signal (IG1A, IG2A) of the IC (U202, U203) is a low signal that is a stabilizing non-inverting (Non Inverting) signal is output as it is.

On the other hand, the output signals IG1B and IG2B of the IC devices U303 and U304 are outputted to the plurality of IGBT driving circuits U401 by outputting a 5V, that is, a HIGH signal, which is a stabilizing inverting signal. Finally, the external IGBT elements IGBT1A, IGBT1B, IGBT2A, and IGBT2B are controlled. That is, the external IGBT elements IGBT1A and IGBT2A are turned on, and the external IGBT elements IGBT1B and IGBT2B are turned off to turn on the power supplied to the magnet LOAD_1. ON).

In addition, in order to turn off the power supplied to the magnet LOAD_1, the external switch (or button) connected to the connector CN_102 is turned off to turn off the input signal of the digital input circuit CIR_101. The IN_CH01 is turned off, and the input signal IN_CH01 outputs a high signal stabilized by a strong signal to noise by the buffer IC element U101, and thus the microcomputer U201. It is interfaced to.

In this case, the microcomputer U201 outputs the output signal DO_CH01 at 5V by a software program, that is, outputs a high signal to output the plurality of buffer IC elements U202 and U203. Input to the U303, U304, the output signal (IG1A, IG2A) of the IC (U202, U203) is a high signal, which is a non-inverting signal (Non Inverting) is output as it is.

On the other hand, the output signals IG1B and IG2B of the IC devices U303 and U304 output 0V, that is, a low signal, which is a stabilizing inverting signal, and are input to the plurality of IGBT driving circuits U401. Finally, the external IGBT elements IGBT1A, IGBT1B, IGBT2A, and IGBT2B are controlled. That is, the external IGBT elements IGBT1A and IGBT2A are turned off, and the external IGBT elements IGBT1B and IGBT2B are turned ON to cut off the power supplied to the magnet LOAD_1. , It turns off.

Here, the external IGBT elements IGBT1A and IGBT2A are turned off, and the external IGBT elements IGBT1B and IGBT2B are turned on to turn on the power supplied to the magnet LOAD_1. Maximizes the reliability and durability of the system by effectively absorbing the surge voltage of the high-voltage counter electromotive force generated when it is turned off, and reliably prevents damage to the system (such as damage to the external IGBT element and damage to the control circuit). Let's go. In addition, the principle for individually turning on and off the power supplied to the magnets LOAD_2, LOAD_3, LOAD_4 and LOAD_5 is also the same as described above.

On the other hand, when the power to the magnet (LOAD_1, LOAD_2, LOAD_3, LOAD_4, LOAD_5) is individually turned on (ON), if the overload occurs during normal operation, that is, the output abnormality may occur due to aging or damage of the load.

For example, when an abnormality occurs in the magnet LOAD_1, the fault signal DI_F01 outputs a 0V signal, ie, a low signal, in the plurality of IGBT driving circuits U401, and thus the buffer IC device. A low signal input to U204 and stabilized by a strong signal against noise by the IC element U204 is output, and is interfaced to the microcomputer U201.

At this time, the microcomputer U201 quickly outputs the output signal DO_CH01 at 5V by using a software program, that is, outputs a high signal and supplies the same to the magnet LOAD_1 described above. By turning off the external IGBT elements IGBT1A and IGBT2A in the same manner as the principle for turning off the power, the external IGBT elements IGBT1B and IGBT2B are turned on, By effectively absorbing the surge voltage of the high-voltage counter electromotive force generated when the power supplied to the magnet LOAD_1 is turned off, the reliability and durability of the system are improved.

CN_101, CN_102: Connector CIR_101: Digital Input Circuit
U102: DC-DC Conveter
U101, U202, U203, U204, U301, U302, U303, U304: IC element for buffer
U201: Microcomputer R1-R10: Resistance
LED1-LED10: LED CIR_401: IGBT driver circuit
CN_1-CN_10: Connector for connecting IGBT element

Claims (6)

In the digital circuit for performing the power control of the lifting magnets (LOAD_1-LOAD_5) for iron plate transfer,
A solid state switching circuit composed of a plurality of IGBT elements for driving the lifting magnets LOAD_1 to LOAD_5 for transferring the steel sheet;
A digital input circuit unit configured to perform isolation of an external control signal for controlling the lifting magnets for loading the iron plate (LOAD_1 to LOAD_5), and to remove noise from the insulation signal and stabilize the output signal;
In response to an external control signal input from the digital input circuit, a control signal for driving the lifting magnets LOAD_1-LOAD_5 is supplied to the solid state switching circuit, and a high voltage state with respect to the lifting magnets LOAD_1-LOAD_5. A microcomputer U201 for controlling a supply voltage to the lifting magnets LOAD_1 to LOAD_5 to absorb a back EMF surge voltage; And
And an IGBT driver circuit for driving IGBT elements of the contactless switching circuit according to the control signal of the microcomputer U201, and detecting an overload state of the plurality of IGBT elements and notifying the microcomputer U201. Power control circuit of lifting magnet for iron plate transfer. The method of claim 1,
The solid-state switching circuit may include a direct current (DC) power input terminal (MP) supplied with direct current power;
A plurality of IGBT elements (IGBT1A, IGBT3A, IGBT5A, IGBT7A, and IGBT9A) connected in series with the input terminal (MP) and configured to switch on / off a direct current DC power;
Lifting magnets LOAD_1 to LOAD_5 connected in series with the IGBT elements IGBT1A, IGBT3A, IGBT5A, IGBT7A, and IGBT9A;
A plurality of IGBT elements (IGBT2A, IGBT4A, IGBT6A, IGBT8A, and IGBT10A) connected in series to the lifting magnets LOAD_1 to LOAD_5 to turn on and off reverse DC power; And
A power control circuit of a lifting magnet for transferring a steel plate, characterized by comprising a reverse DC power input terminal (MN). The method of claim 2,
A plurality of IGBT elements (IGBT2B, IGBT4B, IGBT6B, IGBT8B) connected in parallel with the lifting magnets LOAD_1 to LOAD_5 to absorb surge voltage of counter electromotive force generated when the DC power in the forward direction is turned off. , IGBT10B); And
A plurality of IGBT devices (IGBT1B, IGBT3B, IGBT5B, and IGBT7B) connected in parallel with the lifting magnets LOAD_1 to LOAD_5 to absorb surge voltage of counter electromotive force generated when the DC power in the reverse direction is turned off. And IGBT9B). The power control circuit of the lifting magnet for transporting the sheet steel. The method of claim 1,
The digital input circuit unit may include a connector connected to an external ON and OFF switch capable of individually turning on and off the power supplied to the lifting magnets LOAD_1 to LOAD_5. CN_102);
A digital input circuit CIR_101 for isolating a plurality of input signals IN_CH01-IN_CH05 and minimizing noise; And
And a buffer IC element (U101) for stabilizing the output signal of the digital input circuit (CIR_101). 5. The method of claim 4,
And a pull-up resistor (AR101) is connected between the digital input circuit (CIR_101) and the buffer IC element (U101). 5. The method of claim 4,
The microcomputer U201 is interfaced with the output signals DI_CH01 to DI_CH05 of the buffer IC element U101;
Buffer IC devices U202, U203, U301, and U302 which induce stabilization of the output signals DO_CH01-DO_CH05, DO_OV01-DO_OV05 of the microcomputer U201; And
A plurality of buffer IC elements U303 and U304 for inverting and stabilizing the output signals DO_CH01 to DO_CH05 of the microcomputer U201;
Output signals of the plurality of buffer IC elements U301 and U302 are connected in series with a plurality of resistors R1 through R10 and a plurality of LEDs LED1 through LED10, thereby providing the plurality of buffer IC elements U301 and U302. Power control circuit of the lifting magnet for iron plate conveyance, characterized by displaying the output signal state.

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