KR101920844B1 - Heater temperature multiple unit control apparatus for controlling multiple power regulators for heat treatment and method thereof - Google Patents

Abstract

The present invention relates to an apparatus for controlling the overall temperature of a heater for controlling a plurality of power converters for heat treatment and a method thereof. According to the present invention, there is provided a total heater temperature control method using a heater temperature total control apparatus for controlling first and second heater groups including a plurality of heaters, wherein the total heater temperature control method comprises: The reference temperature for each step and the operation time for each step are input to the first and second reference temperature tables, respectively, using the input reference temperature pattern step number, the reference temperature for each step, and the operation time for each step. The method comprising the steps of: generating a reference temperature pattern for a first heater group and a second heater group; detecting a reference temperature for each heater group at a current time point from a reference temperature pattern for the first and second heater groups; And the heater temperature measured at the current time point is used to calculate the temperature of the plurality of And a step of controlling the emitter. As described above, according to the present invention, various reference temperature patterns can be used, thereby improving process performance using a heater. In addition, since the failure state and operation state of the heater temperature detector are monitored in real time, the reliability of the heat treatment process is improved and the productivity is improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heater temperature total control apparatus for controlling a plurality of heat exchanger power converters,

The present invention relates to an apparatus for controlling the overall temperature of a heater for controlling a plurality of power converters for heat treatment and more particularly to a heater temperature total control apparatus and method for improving the performance of a heat treatment process and the control stability of a heat treatment system .

The heat treatment performed during the welding of the structure is divided into preheating before welding and after welding. The purpose of the heat treatment is to reduce the cooling rate to improve the stress concentration, the residual stress and the HAZ structure of the welded portion during welding, thereby preventing crack deformation or improving the mechanical properties due to the change of the metal structure. In the case of preheating, it is carried out at a temperature of 600 or more in the case of a subheating of 150 or less.

The system for preheating and post-heating to the desired temperature according to the welding object is composed of a ceramic heater composed of hot wire generating heat by current and a SCR power regulator for controlling the temperature of the heater. In order to improve the welding performance of the structure to be welded, the post-heating temperature of the structure should be adjusted in several steps with a plurality of SCR power converters and heaters in the post heat treatment.

Therefore, the temperature of each of 12 ceramic heaters is controlled by using 12 SCR power converters during post heat treatment at the heat treatment site. Specifically, 12 SCR power converters - ceramic heaters are divided into two groups of 6, and six SCR power converters for each group - the ceramic heater temperature is adjusted in several steps over time. Therefore, in order to control the temperature of 6 heaters in two groups according to the heater temperature pattern of different time step, 12 SCR power converters belonging to two groups - ceramic heater temperature total control device are required.

The technology of the background of the present invention is disclosed in Korean Patent No. 10-1467541 (published on Dec. 12, 2014).

An object of the present invention is to provide an apparatus for controlling the overall temperature of a heater and a method thereof for improving the performance of the heat treatment process and the control stability of the heat treatment system.

According to an aspect of the present invention, there is provided a method of controlling a total temperature of a heater using a heater temperature total control apparatus for controlling first and second heater groups including a plurality of heaters, A step of receiving a reference temperature pattern for each of the first and second heater groups, a reference temperature for each step and an operation time for each step, a step number of the inputted reference temperature pattern, a reference temperature for each step, Generating a reference temperature pattern for the first and second heater groups using a time, detecting a reference temperature for each heater group at a current time point from a reference temperature pattern for the first and second heater groups, And a controller for receiving a heater temperature measured at a current time point for each of the plurality of heaters, Using the measured heater temperature and a step of controlling the plurality of heaters.

And monitoring and outputting operation information of the heater included in each heater group and the heater temperature detector corresponding to each of the heaters.

Wherein the step of monitoring and outputting the operation information includes the steps of: determining whether the heater temperature detector corresponding to each of the plurality of heaters has failed, using the heater temperature measured at the current time point; , And outputting a result of the determination as to whether or not the temperature detector is faulty and the reference temperature for each heater group at the present time.

Wherein the step of determining whether or not the heater temperature detector has a failure includes calculating an average value of the heater temperatures measured for the first and second heater groups and calculating an average value of heater temperatures of the heater groups including the respective heaters, Comparing the difference value between the average value and the measured heater temperature with a preset temperature threshold value; counting the number of errors for the heater once if the difference value is greater than a predetermined temperature threshold value; Determining that the heater temperature detector corresponding to the heater has failed if the number of times exceeds a predetermined error threshold value and if the difference value is less than or equal to the predetermined temperature threshold value, And determining that the heater temperature detector corresponding to the heater is normal.

The heater temperature detector includes an insulation amplification part connected to the temperature measurement sensor and separating the ground of the temperature detector connected to the temperature measurement sensor to maintain the temperature sensor in an insulated state, To a second differential signal according to a ground power source different from the ground power source of the temperature measuring sensor, a low pass filter unit for removing noise and ripple components of the second differential signal, And a signal amplifying unit for converting the magnitude of the second differential signal from which the noise and ripple components have been removed.

The controlling of the plurality of heaters may include comparing the reference temperature pattern and the heater temperature measured at the current time, and comparing the heater temperature measured at the current time with the heater temperature measured at the current time, and controlling the ON / OFF of the relay circuit connected to the power converter corresponding to the plurality of heaters So that the SCR gating signal can be applied to or cut off from the power converter.

The apparatus for controlling the overall temperature of the heater according to another embodiment of the present invention includes an input unit for receiving a reference temperature pattern for a first heater group and a second heater group including a plurality of heaters, A pattern generator for generating a reference temperature pattern for the first heater group and the second heater group using the input reference temperature pattern step number, the reference temperature for each step, and the operation time for each step, A reference temperature for each heater group at a current time point is detected from a reference temperature pattern for a plurality of heaters, a heater temperature measured at a current time point for each of the plurality of heaters is received, And a controller for controlling the plurality of heaters using the measured heater temperature.

As described above, according to the present invention, since two heater groups including a plurality of heaters can be controlled by using one general control device, convenience and cost can be reduced.

In addition, various standard temperature patterns can be used, thereby improving the structure welding performance using the heater. In addition, since the failure state and operation state of the heater temperature detector are monitored in real time, the reliability of the heat treatment process is improved and the productivity is improved.

In addition, by greatly reducing the weight of the overall control device for controlling the heater temperature, it is possible to easily move the structure according to the position of the structure to be subjected to the heat treatment.

FIG. 1 is a configuration diagram of a heater temperature total control system according to an embodiment of the present invention.
2 is a configuration diagram of a heater temperature detector according to an embodiment of the present invention.
3 is a configuration diagram of a heater temperature total control apparatus according to an embodiment of the present invention.
4 is a flowchart of a method of controlling the overall temperature of the heater according to the embodiment of the present invention.
5 is a detailed flowchart showing the step S460 of FIG.
6 is a view for explaining a reference temperature pattern according to an embodiment of the present invention.
7 is a diagram for explaining communication data of the heater temperature total control apparatus of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

First, a total temperature control system for a heater using a heater temperature total control apparatus according to an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a configuration diagram of a heater temperature total control system according to an embodiment of the present invention.

1, the heater temperature overall control system according to the embodiment of the present invention includes a first heater group 10 and a second heater group 20 including a plurality of heaters, a plurality of temperature measurement sensors 100 And a heater temperature detector 200, a heater temperature overall control apparatus 300 according to an embodiment of the present invention, a plurality of relay circuits 400 and an SCR power converter 500.

First, the first heater group 10 and the second heater group 20 each include a plurality of heaters. For example, six heaters are included in the first heater group 10, and another six heaters are included in the second heater group 20.

On the other hand, the plurality of heaters included in the first heater group 10 and the second heater group 20 can be controlled according to the same temperature for each group.

Next, a plurality of temperature measurement sensors 100 are formed corresponding to the plurality of heaters included in the first heater group 10 and the second heater group 20. Then, the plurality of temperature measurement sensors 100 measure the corresponding heater temperature in real time, as shown in Fig. At this time, the temperature measuring sensor 100 may use a K-type thermocouple.

Then, the plurality of heater temperature detectors 200 receive the sensing signals from the corresponding plurality of temperature measurement sensors 100, and then use the sensing signals to detect the heater temperature for each heater. The specific configuration of the heater temperature detector 200 according to the embodiment of the present invention will be described in detail below.

Next, the heater temperature total control apparatus 300 according to the embodiment of the present invention calculates the number of steps of the reference temperature pattern for each of the first heater group 10 and the second heater group 20 inputted from the user, The reference temperature pattern for the first heater group 10 and the second heater group 20 is generated using the step control information. The heater temperature total control device 300 detects the reference temperature at the current time point for the first heater group 10 and the second heater group 20 from the reference temperature pattern and measures the detected reference temperature at the present time point Thereby controlling the plurality of heaters.

The heater temperature total control device 300 also includes operation information on the plurality of heaters included in the first heater group 10 and the second heater group 20 and information on the operation of the heater temperature detector 200 corresponding to the plurality of heaters, Can be monitored and output.

In this case, the controller 300 for controlling the overall temperature of the heater according to the embodiment of the present invention receives the step number and the step control information of the reference temperature pattern using the input / output device such as a touch screen, And the operation information of the heater temperature detector 200 can be output.

In addition, the heater temperature total control apparatus 300 according to the embodiment of the present invention processes the heater temperature, the step number, and the step control information measured using a DSP (Digital Signal Processor) It is possible to generate a signal for controlling the temperature.

When the touch screen and the DSP are used as described above, there is an advantage that the volume of the heater temperature total control device 300 can be reduced.

Next, the relay circuit 400 receives a signal for controlling the heater temperature from the heater temperature overall control device 300 to control the relay on and off. Specifically, when the relay is turned on, a SCR gating signal is applied to the corresponding SCR power converter 500 to supply power to the corresponding heater, so that the heater temperature is raised. Conversely, when the relay is turned off, the SCR gating signal is interrupted to the corresponding SCR power converter 500, so that the heater temperature is lowered because power is not supplied to the corresponding heater.

2 is a configuration diagram of a heater temperature detector according to an embodiment of the present invention.

2, the heater temperature detector 200 according to the exemplary embodiment of the present invention includes an isolation amplifier 210, a differential amplifier 220, a low-pass filter 230, and a signal amplifier 240 .

The insulation amplification unit 210 is connected to the temperature measurement sensor 100 and separates the ground of the heater temperature detector 200 connected to the temperature measurement sensor 100 to maintain the temperature measurement sensor 100 in an insulated state .

Specifically, the insulation amplification unit 210 separates a portion connected to the temperature measurement sensor 100 and a portion connected to the differential amplification unit 220, as shown in FIG. 2, 100) in an insulated state. Accordingly, the isolation amplifying unit 210 can minimize the interference signal generated between the different temperature measurement sensors 100.

Next, the differential amplifier 220 converts the first differential signal received from the isolation amplifier 210 into a second differential signal corresponding to a ground power source different from the ground power source of the temperature measurement sensor 100.

The low pass filter 230 removes noise and ripple components of the second differential signal. At this time, the low pass filter 230 may use a low pass filter, thereby minimizing the influence of noise and ripple included in the second differential signal.

Next, the signal amplifying unit 240 converts the magnitude of the second differential signal from which noise and ripple components have been removed, with the predetermined voltage value being the maximum voltage magnitude. For example, if the analog-to-digital converter of the heater temperature total control apparatus 300 according to the embodiment of the present invention can receive an analog signal of up to 3 V, And the magnitude of the second differential signal is converted so that the voltage value becomes 3V.

Next, a configuration of a heater temperature total control apparatus according to an embodiment of the present invention will be described with reference to FIG.

3 is a configuration diagram of a heater temperature total control apparatus according to an embodiment of the present invention.

3, the apparatus 300 for controlling the overall temperature of the heater according to the embodiment of the present invention includes an input unit 310, a pattern generating unit 320, and a control unit 330, .

First, the input unit 310 receives the number of steps of the reference temperature pattern for the first and second heater groups, the reference temperature for each step, and the operation time for each step.

Next, the pattern generating unit 320 generates a reference temperature pattern for the first and second heater groups using the input reference temperature pattern step number, reference temperature for each step, and operation time for each step.

Next, the control unit 330 detects the reference temperature for each heater group at the present time point from the reference temperature pattern for the first and second heater groups.

The controller 330 receives the heater temperatures measured at the current point in time for the plurality of heaters included in the first and second heater groups 20 from the corresponding heater temperature detector 200.

Then, the controller 330 controls the plurality of heaters using the detected reference temperature for each heater group and the heater temperature measured at the current time.

Specifically, the control unit 330 compares the reference temperature pattern and the heater temperature measured at the current time, and controls the ON / OFF of the relay circuit connected to the power converter corresponding to the plurality of heaters according to the comparison result, The gating signal is applied or cut off.

Next, the monitoring unit 340 monitors and outputs operation information of the heater included in each heater group and the heater temperature detector corresponding to each heater.

First, the monitoring unit 340 determines whether or not the heater temperature detector corresponding to each of the plurality of heaters has failed using the heater temperature measured at the present time.

Specifically, in order to determine whether the heater temperature detector 200 is malfunctioning, the monitoring unit 340 calculates an average value of the heater temperatures measured for the first and second heater groups 10 and 20.

The controller 330 compares, for each heater, the difference between the average value of the heater temperatures of the heater groups including the respective heaters and the measured heater temperature with a predetermined temperature threshold value.

At this time, if the difference value is larger than the predetermined temperature threshold value, the controller 330 counts the number of errors for the heater once, and if the accumulated error number exceeds the predetermined error threshold value, It is determined that the temperature detector 200 is malfunctioning.

On the other hand, if the difference is less than or equal to the predetermined temperature threshold, the controller 330 initializes the accumulated number of errors for the heater and determines that the heater temperature detector 200 corresponding to the heater is normal.

The monitoring unit 340 outputs a result of the determination as to whether or not the heater temperature measured at the present time, the reference temperature for each heater group at the present time, and the temperature detector are faulty.

Hereinafter, a method of controlling the overall temperature of the heater according to the embodiment of the present invention will be described with reference to FIG. 4 through FIG.

4 is a flowchart of a method of controlling the overall temperature of the heater according to the embodiment of the present invention.

4, the input unit 310 inputs the number of steps of the reference temperature pattern for the first heater group 10 and the second heater group 20, the reference temperature for each step, and the operation time for each step (S410).

Then, the pattern generating unit 320 generates a reference temperature pattern for the first and second heater groups using the input reference temperature pattern step number, reference temperature for each step, and operation time for each step (S420).

Next, the control unit 330 detects the reference temperature for each heater group at the present time from the reference temperature pattern for the first and second heater groups (S430). That is, from the reference temperature pattern for each of the first heater group 10 and the second heater group 20, the control unit 330 determines whether the first heater group 10 and the second heater group 20 Is detected.

Then, the control unit 330 receives the measured heater temperature at the current time point for each of the plurality of heaters (S440).

Then, the controller 330 controls the plurality of heaters using the detected reference temperature for each heater group and the heater temperature measured at the present time (S450).

Specifically, the control unit 330 compares the reference temperature at the current time point detected from the reference temperature pattern with the heater temperature measured at the current point in time. The control unit 330 controls the on / off states of the relay circuits connected to the power converters corresponding to the plurality of heaters according to the comparison result to apply or cut off the SCR gating signal to the power converter.

For example, if the reference temperature of the first heater group is 1000 degrees at the present time and the heater temperature of the heater A included in the first heater group at the present time is 950 degrees, the heater temperature at the present time does not reach the reference temperature The controller 330 turns on the relay circuit connected to the power converter corresponding to the heater A and applies the SCR gating signal to the power converter.

On the other hand, when the reference temperature of the second heater group is 500 degrees at the present time and the heater temperature of the heater B included in the second heater group at the present time is 550 degrees, the heater temperature at the present time exceeds the reference temperature, The control unit 330 turns off the relay circuit connected to the power converter corresponding to the heater B and cuts off the SCR gating signal to the power converter.

5 is a detailed flowchart showing the step S460 of FIG.

As shown in FIG. 5, the monitoring unit 340 determines whether the heater temperature detector 200 corresponding to each of the plurality of heaters has failed, using the heater temperature measured at the current time.

Specifically, the monitoring unit 340 calculates an average value of the heater temperatures measured for the first heater group 10 and the second heater group 20 (S461).

In operation S462, the control unit 330 compares the average value of the heater temperatures of the heater groups including the respective heaters with the measured heater temperature for each heater, with a preset temperature threshold value.

At this time, if the difference value is larger than the predetermined temperature threshold value, the monitoring unit 340 counts the number of errors for the heater once (S463). If the accumulated error number exceeds the predetermined error threshold value, It is determined that the heater temperature detector 200 corresponding to the heater temperature has failed (S464 and S465). At this time, if the cumulative number of errors does not exceed the predetermined error threshold value, the monitoring unit 340 proceeds to step S461 at the next time point.

On the other hand, if the difference is less than or equal to the predetermined temperature threshold, the monitoring unit 340 initializes the accumulated number of errors for the heater (S466), and the heater temperature detector 200 corresponding to the heater is normal (S467).

For example, assume that the error threshold is 20, and the number of accumulated accumulated faults for the fourth heater in the first heater group 10 is 20 times.

At this time, if the difference value for the fourth heater of the first heater group 10 is larger than the predetermined temperature threshold value, the monitoring unit 340 sets the error number for the fourth heater of the first heater group 10 to 1 And the accumulated number of errors is 21 times.

The monitoring unit 340 determines that the heater temperature detector 200 corresponding to the fourth heater of the first heater group 10 has failed because the accumulated number of errors is greater than the error threshold value.

On the contrary, when the difference value for the fourth heater of the first heater group 10 is larger than the predetermined temperature threshold value, the monitoring unit 340 monitors the accumulated accumulated error of the fourth heater of the first heater group 10 After resetting the number of times of 20 times (that is, resetting the error number 0 circuit), it is determined that the heater temperature detector 200 corresponding to the heater is normal.

Then, the monitoring unit 340 outputs a result of the determination as to whether the heater temperature measured at the current point of time, the reference temperature of the heater group at the current point in time, and the temperature detector are faulty (S468). On the other hand, if the cumulative error count does not exceed the error threshold in step S464, the monitoring unit 340 may not output the determination result of the failure.

Hereinafter, a reference temperature pattern according to an embodiment of the present invention will be described in detail with reference to FIG.

6 is a view for explaining a reference temperature pattern according to an embodiment of the present invention, and Table 1 is a table showing information on the reference temperature for each step and the operation time for each step.

step Operating time Reference temperature One P1 HT1 * 2 P2 HT1 * 3 P3 HT2 * 4 P4 HT2 * 5 P5 0

For example, it is assumed that the number of steps of the temperature control pattern of the second heater group 20 inputted in step S410 is five.

Then, as shown in Table 1, the pattern generating unit 320 generates the reference temperature pattern shown in FIG. 6 using the operation time and the reference temperature for each of the steps 1 to 5.

6, first, the pattern generator 320 operates for P1 time until the time Tc1, and the temperature is linearly changed from 0 degree to the reference temperature HT1 * of the step 1 Thereby generating a rising temperature rising pattern.

Next, the pattern generating unit 320 generates a temperature maintaining pattern for maintaining the temperature from HT1 * to HT1 *, which is the reference temperature of Step 2, for the time period from the time Tc1 to the time Tc2 for the step 2 with respect to the step 2.

Next, the pattern generator 320 generates a temperature increase pattern in which the temperature linearly increases from HT1 * to HT2 *, which is the reference temperature of step 3, for the time period from the time Tc2 to the time Tc3 with respect to the step 3 .

Next, the pattern generating unit 320 generates a temperature maintaining pattern for maintaining the temperature from HT2 * to HT4 *, which is the reference temperature of step 4, for a period of time P4 from time Tc3 to time Tc4 with respect to step 4.

Next, the pattern generator 320 generates a cooling pattern in which the temperature is linearly lowered from HT2 * to 0, which is the reference temperature of step 3, for the time period P5 from time Tc4 to time Tc5 with respect to step 5 .

Then, the pattern generating unit 320 generates a reference temperature pattern as shown in FIG. 6, including the temperature control patterns for steps 1 to 5.

7 is a diagram for explaining communication data of the heater temperature total control apparatus of the present invention.

It is assumed that the heater temperature total control apparatus according to the embodiment of the present invention performs an operation necessary for inputting and outputting and controlling information by using a DSP and a touch screen and performs RS232C serial communication using a DSP as a master and a touch screen as a slave do. Then, four kinds of communication data can be transmitted / received between the DSP and the touch screen.

First, the first communication data requests the step number of the reference temperature pattern of the first heater group 10 and the second heater group 20 from the DSP to the touch screen, and the step number of the reference temperature pattern Means data to be transmitted.

Next, the second communication data includes the heater temperature measured at the current time point for the plurality of heaters included in the first heater group 10 from the DSP to the touch screen, the reference temperature for each heater group at the present time, And transmits a response message indicating that the data has been normally received from the touch screen to the DSP.

Next, the third communication data includes the heater temperature measured at the current time point for the plurality of heaters included in the second heater group 20 from the DSP to the touch screen, the reference temperature for each heater group at the present time, And transmits a response message indicating that the data has been normally received from the touch screen to the DSP.

Next, the fourth communication data is transmitted from the touch screen to the DSP by a step-by-step operation when the DSP requests the reference temperature for each step and the operation time for each step for the first heater group 10 and the second heater group 20 Reference temperature and operation time per step.

According to the embodiment of the present invention, since two heater groups including a plurality of heaters can be controlled by using one general control device, convenience and cost can be reduced.

In addition, various standard temperature patterns can be used, thereby improving the structure welding performance using the heater. And, by real-time monitoring of the failure state and the operating state of the heater temperature detector, the reliability of the heat treatment process is improved and the productivity is improved.

In addition, by greatly reducing the weight of the overall control device for controlling the heater temperature, it is possible to easily move the structure according to the position of the structure to be subjected to the heat treatment.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: first heater group 20: second heater group
100: Temperature sensor 200: Heater temperature detector
210: Isolation amplifier 220: Differential amplifier
230: low pass filter unit 240: signal amplifying unit
300: heater temperature total control device 310: input part
320: pattern generator 330:
340: monitoring section 400: relay circuit
500: SCR power converter

Claims (12)

A method for controlling a total temperature of a heater using a heater temperature total control device for controlling first and second heater groups including a plurality of heaters,
Receiving a reference temperature pattern temperature for each of the first and second heater groups, a reference temperature for each step, and an operation time for each step,
Generating a reference temperature pattern for the first and second heater groups using the input reference temperature pattern step number, the reference temperature for each step, and the operation time for each step,
Detecting a reference temperature for each heater group at a current time point from a reference temperature pattern for the first and second heater groups,
Receiving the heater temperature measured at the current time point for each of the plurality of heaters and controlling the plurality of heaters using the detected reference temperature for each heater group and the heater temperature measured at the current time point,
Monitoring and outputting operation information of the heater temperature detector corresponding to each heater and each heater included in each of the heater groups,
The step of monitoring and outputting the operation information includes:
Determining whether the heater temperature detector corresponding to each of the plurality of heaters has failed using the heater temperature measured at the current time point, and
And outputting a result of the determination as to whether the heater temperature measured at the current point of time, the reference temperature of the heater group at the current point of time, and the temperature detector is faulty,
Wherein the step of determining whether the heater temperature detector is malfunctioning comprises:
Calculating an average value of heater temperatures measured for each of the first and second heater groups,
Comparing the average value of heater temperatures of the heater groups including the respective heaters with the measured heater temperature for each heater with a preset temperature threshold value,
If the difference value is greater than a predetermined temperature threshold value, counting the number of errors for the heater once, and if the accumulated number of times of the error exceeds the predetermined error threshold value, the heater temperature detector corresponding to the heater is failed , And
And if the difference is less than or equal to a preset temperature threshold, initializing a cumulative number of errors for the heater, and determining that the heater temperature detector corresponding to the heater is normal. delete delete delete The method according to claim 1,
The heater temperature detector includes:
An insulation amplification part connected to the temperature measurement sensor and separating the ground of the temperature detector connected to the temperature measurement sensor to maintain the temperature measurement sensor in an insulated state,
A differential amplification unit for converting the first differential signal received from the insulation amplification unit into a second differential signal corresponding to a ground power source different from the ground power source of the temperature measurement sensor,
A low pass filter for removing noise and ripple components of the second differential signal,
And a signal amplifier for converting a magnitude of the second differential signal from which the noise and ripple components have been removed, using a predetermined voltage value as a maximum voltage magnitude. The method according to claim 1,
Wherein controlling the plurality of heaters comprises:
Comparing the reference temperature pattern and the measured heater temperature at the current time point, and
And controlling the ON / OFF of the relay circuit connected to the power converter corresponding to the plurality of heaters according to the comparison result to apply or cut off the SCR gating signal to the power converter. An input unit for inputting the number of steps of the reference temperature pattern for the first and second heater groups including the plurality of heaters, the reference temperature for each step, and the operation time for each step,
A pattern generator for generating a reference temperature pattern for the first and second heater groups using the input reference temperature pattern step number, reference temperature for each step, and operation time for each step,
A reference temperature for each heater group at a current time point is detected from a reference temperature pattern for the first and second heater groups, a heater temperature measured at a current time point for each of the plurality of heaters is received, A controller for controlling the plurality of heaters using a star standard temperature and a heater temperature measured at the current time point, and
And a monitoring unit for monitoring and outputting operating information of a heater included in each of the heater groups and a heater temperature detector corresponding to each of the heaters,
The monitoring unit,
Determining whether or not the heater temperature detector corresponding to each of the plurality of heaters is faulty by using the heater temperature measured at the current point of time and determining whether the heater temperature measured at the current time point, Outputs a result of determination as to whether or not the detector is faulty,
The monitoring unit,
Calculating an average value of the heater temperatures measured for each of the first and second heater groups and setting a difference value between the average value of the heater groups of the heater groups including the respective heaters and the measured heater temperature And if the difference is greater than a preset threshold value, counting the number of errors for the heater once, and if the accumulated number of errors exceeds the predetermined error threshold value, If the difference value is less than or equal to the predetermined temperature threshold value, the accumulated number of errors for the heater is initialized, and if it is determined that the heater temperature detector corresponding to the heater is normal Heater temperature control unit. delete delete delete 8. The method of claim 7,
The heater temperature detector includes:
An insulation amplification part connected to the temperature measurement sensor and separating the ground of the temperature detector connected to the temperature measurement sensor to maintain the temperature measurement sensor in an insulated state,
A differential amplification unit for converting the first differential signal received from the insulation amplification unit into a second differential signal corresponding to a ground power source different from the ground power source of the temperature measurement sensor,
A low pass filter for removing noise and ripple components of the second differential signal,
And a signal amplifying unit for converting a magnitude of the second differential signal from which the noise and ripple components have been removed, using a predetermined voltage value as a maximum voltage magnitude. 8. The method of claim 7,
Wherein,
The control unit compares the reference temperature pattern and the heater temperature measured at the current time point and controls the on / off state of the relay circuit connected to the power converter corresponding to the plurality of heaters according to the comparison result to apply the SCR gating signal to the power converter The heater temperature total control device for shutting off.

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