KR20090041201A - Controller for heating pad and method thereof - Google Patents

Abstract

A heating pad controller and a control method thereof are provided to express the pad failure state by using the reference resistance and the computation resistance value of the look up table. A heating pad controller performs the temperature control by using the temperature sensor in the triple attaching process. A power input portion(100) generates the circuit operation power after receives the drive power from outside. A main control unit(110) processes and indicates the computation resistance value for the fault division of the heating pad. A voltage inspector(151) is installed at the location for measuring the voltage of the drive power. A voltage measurement part(150) is connected to the voltage inspector, and measures the voltage of the drive power of the heating pad. A current measurement area(160) measures the current of the drive power of the heating pad.

Description

Heating pad controller and control method {CONTROLLER FOR HEATING PAD AND METHOD THEREOF}

The present invention relates to a heating pad controller and a control method.

In general, a triplex is formed on the cargo hold of an LENG vessel to form a secondary barrier, and an attachment operation is performed by some automation equipment or by hand, and a heat pad or a heating pad is used.

The temperature controller 10 of the thermal pad for thermal insulation barrier connection of the LENG vessel according to the prior art is connected to the heating wire of the thermal pad to supply power to the thermal pad 11; A temperature sensor 12 connected to the heat pad to sense a temperature of the heat pad; A pressure sensor 18 connected to a pressure pad that applies pressure to the heat pad to sense a current pressure; A setting input unit 13 for inputting setting information including a target temperature of the thermal pad and a working time to the target temperature; The on / off switching speed of the power supply unit 11 is controlled by calculating the power on / off cycle by receiving the sensing temperature of the temperature sensor and the setting information of the setting input unit 13, and detecting temperature information per hour of the thermal pad. A temperature control unit 14 for outputting and receiving and transmitting a current pressure of the pressure sensor 18; A display unit 15 for receiving the hourly detected temperature information output from the temperature controller 14 and displaying it on a screen, and displaying the current pressure transmitted from the temperature controller 14 in numerical values; A data storage unit 16 for storing the detected temperature information per hour output from the temperature control unit 14; And a connection port 17 for transmitting the information stored in the data storage unit 16 to an external device, wherein the setting input unit 13 stores information on the detected temperature information per hour stored in the data storage unit 16. The cycle is further input, and the temperature controller 14 further outputs the detected temperature information per hour according to the storage cycle.

In addition, the power supply unit 11 in the temperature controller 10 of the thermal pad for thermal insulation barrier connection of the LENG vessel according to the prior art by using the presence or absence of current flow of the heating wire of the thermal pad detected the disconnection information of the heating wire Is transmitted to the temperature control unit 14.

The temperature control unit 14 receives the disconnection information transmitted and cuts off the power supply of the power supply unit 11 to quickly cope with an accident caused by the disconnection.

The thermal pad used in the related art has a series power supply type in which one power supply line of the power supply unit 11 is connected to one end of the heating wire, and the other power supply line of the power supply unit 11 is connected to the other end of the heating wire. This leads to the use of a planar heating element.

Here, when the thermal pad of the conventional series power supply type is formed to a length of about 3 meters, it is difficult to expect a uniform heat generation performance based on the pad area on the basis of resistance characteristics.

In the heat pad having a heating wire of such a series power supply type, if the wire is disconnected due to an accident or for some reason during use, the power supply unit 11 can grasp the presence or absence of current flow in the heating wire because no current flows in the heating wire. I understand.

Nevertheless, according to many years of research and development of heating pads or triplex attachment devices by the applicant and related inventors, heat pads having a series-heated heating wire are difficult to be used for forming a thermal barrier due to uneven heat generation characteristics. .

Unlike the conventional technology, the thermal pad used for the insulation barrier construction of most L vessels is manufactured by a parallel power supply method having a relatively uniform area-based heat generation measurement.

In other words, the thermal pad for thermal insulation barrier construction of the parallel power supply system forms a heating wire in a cell having a predesigned unit area, and the cells are arranged in a plurality of cells in the parallel power line and arranged along the pad travel direction. Both ends of the cell's heating wires are connected in parallel, such as by energizing one side and the other side of the parallel power line.

Such a thermal pad for thermal insulation construction is very difficult to identify the local disconnection simply by the presence or absence of current flow.

That is, since the thermal pad for general thermal insulation barrier construction is not recognized as a state of current flow or no state when local heating of a part of the heating wire is performed, the heating wire actually uses the power supply 11 or the temperature controller 14 of the temperature controller of the prior art. It has the obvious disadvantage of not detecting some disconnection or overheating due to the disconnection.

As an example, in the applicant's workplace, a disconnection occurred locally in a heating wire of one cell, and power was supplied from a heating wire of another cell. However, this situation is caused by visual identification, odor identification, and transient by temperature sensor 12. As a result of being left intact due to a temperature increase and the like, there is a case of a fire occurring during a long time of work.

That is, the temperature controller 10 of the prior art is a situation in which it is not possible to grasp a local disconnection of a heating wire composed of a plurality of cells only by disconnection according to the presence or absence of current flow of the heating wire, and prevent fire.

In addition, most heat pads or heating pads have a length of about 3 meters and have various shapes and planar areas, such as a straight line, an acute angle like a V letter, a right angle, an obtuse angle, and the like. It is difficult to determine whether the thermal pads are disconnected due to the overheating symptom of 12).

In addition, the power supply status of the shipyard in which the temperature controller 10 of the prior art is used is very poor, since the voltage of the driving power supplied to the thermal pad is variable and is not always uniform from 180V to 240V, only a simple current change is performed. It is very difficult to measure the failure state of the thermal pad in real time while working.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to output the calculated resistance value calculated the resistance of the heating pad, and to record and store information about the heating pad It is a technical object of the present invention to provide a heating pad controller and a control method capable of displaying a pad failure state by using a reference resistance value of a look-up table and the calculated resistance value.

Technical problem of the present invention as described above, as described in detail below, in the heating pad controller for performing a temperature control using a temperature sensor in the process of attaching a triplex, heating while performing the temperature control of the heating pad A main control unit for processing or displaying a calculated resistance value for distinguishing a failure of a pad; A voltage measuring unit measuring a voltage of a driving power source of the heating pad; A current measuring unit measuring a current of a driving power source of the heating pad; And a resistance calculator configured to calculate the calculated resistance value by using the voltage measured by the voltage measuring unit and the current measured by the current measuring unit.

In addition, the technical problem or object of the present invention is a heating pad control method for performing a temperature control using a temperature sensor in the process of attaching a triplex, the input step of driving power; A voltage measuring step of measuring a voltage of a driving power source; A supplying step of supplying driving power to a heating pad; A current measuring step of measuring a current of the driving power source; A resistance calculation step of calculating a calculated resistance value using the voltage measured by the voltage measuring unit and the current measured by the current measuring unit; And an output step of outputting the calculated calculated resistance value through the display unit.

The heating pad controller according to the present invention measures the voltage and current of the driving power source used in the shipyard by the voltage measuring unit and the current measuring unit, respectively, and then calculates and outputs the resistance value in the resistance calculation unit using the measured values. Even in a variable voltage environment, the resistance value of the heating pad can be calculated accurately.

In addition, the heating pad control method of the present invention compares the calculated resistance value with the reference resistance value of the look-up table of the storage device, and determines that the heating pad is defective based on the case where the calculated resistance value is larger than the reference resistance value. There is an advantage to judge.

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

2 is a block diagram of a heating pad controller according to an embodiment of the present invention, Figure 3 is a flow chart of the heating pad control method performed by FIG.

First, as shown in Figure 2, the heating pad controller according to the present invention has a power input unit 100 for generating a circuit operating power after receiving the driving power from the outside.

In addition, the heating pad controller has a main controller 110 coupled to receive the circuit operation power of the power input unit 100.

The main controller 110 includes a temperature control circuit using high speed or low speed PID (Proportional Integrate Derivative) control; An output circuit for displaying the set temperature, measured temperature, voltage, current, and calculated resistance of the heating pad on the display unit; An input circuit which receives an external input value, a command, a set value, a temperature signal, or data through a graphic user interface (GUI), a keypad, a communication port, or the like; A comparison circuit for comparing and checking a reference resistance value input to a look-up table 181 with a calculated resistance value to determine a failure of the heating pad 200; A power management circuit for generating a power supply or shutdown signal according to a result of a comparison check between the calculated resistance value and the reference resistance value; A sensor signal processing circuit connected to the temperature sensor; A data management circuit for retrieving, reading out, and outputting data corresponding to data input or external input of the storage device 180 having the library-type lookup table 181; It has a field programmable gate array (FPGA) based operating circuit that performs the overall operation of the circuits.

The main control unit 110 refers to an embedded system including a CPU board and the above-mentioned peripheral boards for various circuits. The main controller 110 is responsible for input / output of various signals or result values related to the calculated resistance value along with temperature control of the heating pad.

The power supply control unit 120 is coupled to the main control unit 110 to receive the driving power of the power input unit 100.

The input terminal of the power supply control unit 120 is connected to the power management circuit of the main control unit 110 to supply driving power toward the heating pad 200 in response to the power supply or shutdown signal input from the power management circuit. Power cut off control technology to cut off.

In particular, the blocking signal is generated in the power management circuit and input to the power supply control unit 120 when the heating pad is displayed in a bad state.

Subsequently, the power supply control unit 120 performs a supply or shutdown control in accordance with a routine to be set according to a bad situation such as temporarily shutting off the driving power supplied to the heating pad 200 in accordance with the blocking signal.

The output terminal of the power supply control unit 120 is connected to the heating pad 200 through a connection cable.

The heating pad 200 includes a connecting cable having an attachable connector, a parallel power line 201 connected to the connecting cable and extending by a predetermined length in the longitudinal direction of the substrate from both sides of the substrate, and a cell for each divided heating wire. And a heat generating unit 210 forming 211, 212, and 219.

The temperature sensor 131 is installed at the seating position of the substrate inside the heat generating unit 210.

The temperature sensor 131 is connected to the main controller 110 through the sensor interface 130 and the sensor line, and inputs a temperature signal to the input circuit of the main controller 110.

The input / output unit 140 connected to the output circuit of the main controller 110 is configured to display the temperature, voltage, current, and calculated resistance of the heating pad on the display unit.

In particular, the heating pad controller of the present invention is a voltage meter 151 installed at a position capable of measuring the voltage of the driving power input to the power input unit 100, and the voltage measuring unit 150 connected to the voltage meter 151 Has

The voltage measuring unit 150 has a measuring area that can cover the voltage of the driving power source disclosed in the present invention, and is a small chip type isolation transformer or a board coil bridge circuit for voltage measurement. desirable.

The voltage measuring unit 150 is preferably composed of a circuit for measuring by converting to a voltage of 1 ~ 5V.

In another aspect, the heating pad controller according to the present invention includes a current meter 161 installed at a position capable of measuring a current of a driving power output from a power supply controller, and a current meter 160 connected to the current meter 161. Has

The current measuring unit 160 has a measurement area that can cover the driving current disclosed in the present invention. The current measuring unit 160 measures hall voltage values at a constant ratio by using a hall effect. It has the form of, and has a peak-detection circuit that reads the peak value of a sine wave and measures it as a current value.

At this time, by setting the current / voltage ratio to 1: 1, a current value of 1 ~ 5A can be measured, and if necessary, the range of the measured current is varied by adjusting the winding ratio of the current meter 161.

The voltage measuring unit 150 and the current measuring unit 160 are respectively connected to the resistance calculator 170 to input respective measurement values (voltage, current).

The resistance calculator 170 is configured with a circuit that calculates a calculated resistance value using a formula relating to a known resistance.

The resistance calculator 170 inputs the calculated resistance value to the main controller 110.

The main controller 110 displays the input calculated resistance value on the display unit, and informs the user of the resistance value of the heating pad 200 in operation.

For example, the heating pad 200 has a resistance value that is similar or equal to a reference resistance value previously known by a user within a preset allowable range in normal operation.

However, when the disconnection part 220 is generated due to the external force f or the like on the heating pad 200, the measurement current of the current measuring unit 160 is increased based on the time point at which the voltage measuring unit 150 measures the voltage. Instead of being smaller, the calculated resistance value is generated much larger than the reference resistance value.

Through this, the user can determine the failure of the heating pad 200 such as a local disconnection situation.

This process is automated by a check circuit of the main controller 110, a lookup table 181 of a library type that records and stores a reference resistance value as data, a data management circuit, and an operating circuit based on an FPGA (Field Programmable Gate Array). In addition, the pad failure state may be displayed or warned on the display unit.

That is, referring to the heating pad control method shown in FIG. 3, the input step S10 of driving power, the voltage measuring step S11 of measuring the voltage of the driving power, and the supply of supplying driving power to the heating pad Step S12, current measurement step S13 for measuring the current of the driving power supply, and resistance calculation step S14 for calculating the calculated resistance value using the voltage measured by the voltage measuring unit and the current measured by the current measuring unit (S14). And an output step S15 of outputting the calculated calculated resistance value through the display unit.

In addition, the heating pad control method compares the calculated resistance value with the reference resistance value of the look-up table, and displays the case where the calculated resistance value is larger than the reference resistance value as the defective state of the heating pad, the display unit, the graphic user interface, or the normal warning means (not shown). , For example, a lamp, a buzzer, etc.).

The warning means may be further coupled to the input / output unit 140 (see FIG. 2) in accordance with known circuit configurations.

On the other hand, the heating pad control method may further include a failure processing step (S17) to intermittently shut off the driving power supplied to the heating pad in conjunction with the display step (S16).

1 is a block diagram showing a temperature controller of a thermal pad for thermal insulation barrier connection of the LENG vessel according to the prior art.

2 is a block diagram of a heating pad controller according to an embodiment of the present invention.

3 is a flowchart illustrating a heating pad control method performed by FIG. 2.

               Description of the main parts of the drawing

100: power input unit 110: main control unit

120: power supply control unit 131: temperature sensor

130: sensor interface 140: input and output unit

150: voltage measuring unit 160: current measuring unit

170: resistance calculator 180: memory device

181: look-up table 200: heating pad

Claims (6)

In the heating pad controller to perform a temperature control using a temperature sensor in the process of attaching triplex, A main controller configured to process or display a calculated resistance value for distinguishing a defective heating pad while performing temperature control of the heating pad; A voltage measuring unit measuring a voltage of a driving power source of the heating pad; A current measuring unit measuring a current of a driving power source of the heating pad; A resistance calculator for calculating the calculated resistance value by using the voltage measured by the voltage measuring unit and the current measured by the current measuring unit; Heating pad controller comprising a. The method of claim 1, The main control unit Temperature control circuit using high speed or low speed PID (Proportional Integrate Derivative) control; An output circuit for displaying a set temperature, a measured temperature, a voltage, a current, and a calculated resistance of the heating pad on a display unit; An input circuit which receives an external input value, a command, a set value, a temperature signal or data through a graphic user interface (GUI), a keypad, a communication port, or the like; A comparison circuit for comparing and checking a reference resistance value input to a look-up table with a calculated resistance value to determine a failure of the heating pad; A power management circuit for generating a signal for power supply or cut-off according to a comparison check result of the calculated resistance value and the reference resistance value; A sensor signal processing circuit connected to the temperature sensor; A data management circuit for retrieving, reading out and outputting data corresponding to data input or external input of a storage device having the lookup table in a library format; Field Programmable Gate Array (FPGA) -based operating circuits that perform general operations of the circuits; Heating pad controller comprising a. The method of claim 1, And the voltage measuring unit is a chip-type isolation transformer or a bridge coil circuit for measuring voltage. The method of claim 1, The current measuring unit And a peak-detection circuit for reading a peak value of a sine wave related to a hall voltage value obtained by using a hall effect and measuring it as a current value. In the heating pad control method of performing a temperature control using a temperature sensor in the process of attaching triplex, Inputting driving power; A voltage measuring step of measuring a voltage of a driving power source; A supply step of supplying driving power to a heating pad; A current measuring step of measuring a current of the driving power source; A resistance calculation step of calculating a calculated resistance value using the voltage measured by the voltage measuring unit and the current measured by the current measuring unit; An output step of outputting the calculated calculated resistance value through a display; Heating pad control method comprising a. The method of claim 5, After the output step A display step of comparing the calculated resistance value with a reference resistance value of the lookup table and displaying a case where the calculated resistance value is larger than the reference resistance value as a defective state of the heating pad; A failure processing step of temporarily shutting off the driving power supplied to the heating pad by the power supply control unit in conjunction with the display step; Heating pad control method characterized in that it further comprises.

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