KR102774580B1 - Method and Device for Overheating Prevention and Heat Temperature Control of Heater Using Temperature Characteristic of Electric Heating Wire - Google Patents

Abstract

The present invention provides a method for preventing overheating of a heater and controlling the heating temperature by utilizing the temperature characteristics of a heating wire, which is more safe and reliable than the prior art and is effective in preventing fire by preventing overheating of the heater and controlling the heating temperature by utilizing the unique temperature coefficient of the heating wire.
The method for preventing overheating of a heater and controlling the heating temperature by using the temperature characteristics of a heating wire of the present invention includes: a resistance input step for setting a unique resistance value according to the heating temperature of the heating wire, which changes as the temperature of the heating wire rises and falls when power is applied, for each temperature section and inputting the same to a main control unit; a current measurement step for measuring the current value of the heating wire and inputting the same to the main control unit; a resistance judgment step for determining, in the main control unit, whether the resistance value converted by the measured current value is within or outside a certain percentage (%) range of the set unique resistance value for each temperature section; and a heater control step for outputting a control signal to the heater control unit so that if the resistance value is maintained within a certain percentage (%) range in the resistance judgment step, the main control unit determines that it is in a normal state and continues to supply power, and if it is outside a certain percentage (%) range, the main control unit determines that it is in an abnormal state and cuts off the power supply to the heating wire. The heater control unit then controls the power applied to the heating wire.

Description

Method and device for overheating prevention and heat temperature control of heater using temperature characteristic of electric heating wire {Method and device for overheating prevention and heat temperature control of heater using temperature characteristic of electric heating wire}

The present invention relates to a method and device for preventing overheating and controlling the heating temperature of a heater by utilizing the temperature characteristics of a heating wire, and more specifically, to a method and device for preventing overheating and controlling the heating temperature of a heater by utilizing the temperature characteristics of a heating wire, which can stably control the heating temperature of a heater by utilizing the unique temperature coefficient of the heating wire.

A heater is a device that generates heat by supplying electricity, and is mainly used to heat fluids or heat conductors such as water or air with which it comes into direct or indirect contact.

In general, submersible heaters are widely used in fish tanks, aquariums, fish tanks, seed germinators, microbial fermenters, liquid fertilizer manufacturers, etc. to maintain a constant temperature of water or liquid.

Technologies for underwater heaters are disclosed in Korean Patent Publication No. 10-2011-0027622, Patent Registration No. 10-0938598, and Utility Model Registration No. 20-0438539.

When electricity (voltage) is applied (supplied) to the heater, current flows through the heater and heat is generated. If this is not safely controlled, the heater may overheat and cause a thermal runaway phenomenon. This may result in an electrical safety accident and fire, and there is a risk of damage to related components. Therefore, it is necessary to prevent the heater from overheating and control it to a set temperature.

Technologies for preventing overheating of a heater and controlling the temperature are disclosed in Korean Patent Publication Nos. 10-1909519, 10-0579439, and Publication No. 10-1998-0058314, etc.

In the conventional case, in order to prevent overheating of the heater and control the heating temperature, a temperature sensor (bimetallic sensor) is installed externally, and the output is configured to simply turn on/off. In this case, if the temperature sensor deviates from the set position or malfunctions (errors), a problem occurs in the temperature control of the heater, overheating occurs, and a thermal runaway phenomenon of the heater occurs, and the heat of the overheated heater is conducted to the surrounding flammable materials, causing a fire, and a large amount of material loss and casualties may occur.

The present invention has been made in consideration of the above points, and provides a method and device for preventing overheating of a heater and controlling the heating temperature by utilizing the temperature characteristics of a heating wire, which are more safe and reliable than the prior art and effective in preventing fire by preventing overheating of the heater and controlling the heating temperature by utilizing the unique temperature coefficient of the heating wire.

A method for preventing overheating of a heater and controlling the heating temperature by using the temperature characteristics of a heating wire according to an embodiment of the present invention comprises: a resistance input step for setting a unique resistance value according to the heating temperature of a heating wire that changes as the temperature of the heating wire rises and falls when power is applied, and inputting the set resistance value to a main control unit for each temperature section; a current measuring step for measuring a current value of the heating wire and inputting the set resistance value to the main control unit; a resistance judgment step for determining, in the main control unit, whether a resistance value converted by the measured current value is within or outside a predetermined percentage (%) range of the set resistance value for each temperature section; and a heater control step for outputting a control signal to the heater control unit so that if the resistance value is maintained within a predetermined percentage (%) range in the resistance judgment step, the main control unit determines that it is in a normal state and continues to supply power, and if it is outside a predetermined percentage (%) range, the main control unit determines that it is in an abnormal state and cuts off the power supply to the heating wire. The heater control unit controls the power applied to the heating wire.

In the above current measurement step, after applying voltage through the current monitoring unit, the current amount compared to the voltage is measured for the first 2 seconds to check the power consumption of the heating wire, and thereafter, the current increase is measured twice (twice at 5-second intervals) every 5 seconds to estimate the current increase curve, and based on this increase curve, a reference slope table is set, the current amount compared to the temperature is calculated, and based on this, the main control unit can determine the normal operation and overheating operation of the heating wire.

In addition, the current measurement step can be configured to graph the current trend line according to the temperature coefficient (characteristics) of the heating wire versus the voltage using data measured through the current monitoring unit, and to distinguish the type of the heating wire based on analysis of the collected data, and the resistance judgment step and the heater control step can be configured to estimate the temperature of the heating wire by a change in the amount of current when the type of the heating wire is specified, compare and judge it, and control the heating wire.

It is also possible to further include a voltage measurement step for measuring the voltage applied to the heating wire above and inputting it to the main control unit, and a voltage judgment step for determining whether the measured voltage value is within or outside a certain percentage (%) of the set voltage range in the main control unit.

In addition, it is also possible to configure the heater control step to generate an alarm and cut off the power supply if the voltage value measured in the voltage judgment step is judged to be low or high by a certain percentage (e.g., 10 to 20%) of the set voltage.

In addition, it is also possible to further include a temperature measurement step for transmitting the measurement value of a temperature sensor measuring the temperature near where the heating wire is installed to the main control unit, and a temperature judgment step for determining whether the temperature value measured by the main control unit is within or outside the set temperature range.

It is also possible to configure the above heater control step to block power supply if the temperature measured in the above temperature judgment step is determined to be outside the set temperature range.

And, the device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to an embodiment of the present invention comprises: a current monitoring unit for measuring the current of a heating wire; a main control unit for determining whether the resistance value converted by the current value measured by the current monitoring unit is within or out of a predetermined percentage (%) of the inherent resistance value of the heating wire for each set temperature section, and outputting a control signal to continuously supply power to the heating wire if the resistance value is maintained within a predetermined percentage (%) range and to determine that it is an abnormal state if it is out of a predetermined percentage (%) range; and a heater control unit for controlling the power applied to the heating wire according to the control signal of the main control unit.

The device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to an embodiment of the present invention may further include a voltage monitoring unit that is connected to the main control unit and measures and transmits the voltage of the heating wire.

It is also possible to configure the above current monitoring unit and voltage monitoring unit in multiple configurations.

It is also possible to configure the above current monitoring unit and voltage monitoring unit together so that the main control unit compares and analyzes the measured values of the current monitoring unit and the measured values of the voltage monitoring unit and outputs a control signal.

In addition, the device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to an embodiment of the present invention may further include a temperature sensor for measuring the temperature near where the heating wire is installed, and a temperature monitoring unit for transmitting the temperature value measured by the temperature sensor to the main control unit.

It is also possible to configure the above current monitoring unit and temperature monitoring unit together so that the main control unit compares and analyzes the measured values of the current monitoring unit and the measured values of the temperature monitoring unit and outputs a control signal.

According to a method and device for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to an embodiment of the present invention, it is possible to accurately determine the temperature of a heating wire that changes as voltage is applied to the heating wire using the rate of change of a current value and a resistance value, and it is possible to prevent overheating of the heating wire and prevent the occurrence of fire or damage to components.

In addition, according to the method and device for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to an embodiment of the present invention, it is possible to detect the input voltage and input current, the output voltage and output current together by configuring the current monitoring unit and the voltage monitoring unit in multiple numbers, so that it is possible to increase the stability of measurement and control.

And, according to the method and device for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to an embodiment of the present invention, the current monitoring unit and the voltage monitoring unit are configured together to compare and analyze data on the change in current of the heating wire due to the voltage applied from the main control unit and the change in current due to overheating of the heating wire, thereby making it possible to more accurately identify the state of the heating wire and prevent unnecessary overheating of the heating wire.

According to a method and device for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to an embodiment of the present invention, it is possible to distinguish and specify the type of the heating wire based on analysis of collected data, and to automatically control the heating wire according to the type of the heating wire.

FIG. 1 is a block diagram showing a method for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to one embodiment of the present invention.
FIG. 2 is a block diagram showing another example of a method for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to one embodiment of the present invention.
Figure 3 is a graph showing the specific resistance characteristics of four types of commonly used heating wires according to temperature.
FIG. 4 is a block diagram schematically showing a device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to another embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, process, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, processes, operations, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

The term “MODULE” as used herein means a single unit that processes a specific function or operation, and may mean hardware, software, or a combination of hardware and software.

The terms or words used in this specification and claims should not be interpreted as limited to their common or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best way. In addition, if there is no other definition for the technical and scientific terms used, they have the meanings commonly understood by those of ordinary skill in the technical field to which this invention belongs, and the description of well-known functions and configurations that may unnecessarily obscure the gist of the present invention in the following description and the attached drawings are omitted. The drawings introduced below are provided as examples so that those skilled in the art can sufficiently convey the idea of the present invention. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms. In addition, the same reference numerals represent the same components throughout the specification. It should be noted that the same components in the drawings are represented by the same symbols wherever possible.

Next, a preferred embodiment of a device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to the present invention will be described in detail with reference to the drawings.

The present invention can be implemented in various forms and is not limited to the embodiments described below.

In the following, in order to clearly explain the present invention, detailed descriptions of parts that are not closely related to the present invention are omitted, and the same reference numerals are given to identical or similar components throughout the description of the invention, and repetitive descriptions are omitted.

First, a method for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to an embodiment of the present invention comprises a unique resistance input step (S10), a current measurement step (S20), a resistance judgment step (S30), and a heater control step (S80), as shown in FIGS. 1 and 2.

And, according to another embodiment of the present invention, a device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire, as shown in FIG. 4, comprises a current monitoring unit (20) for measuring the current of a heating wire (10), a main control unit (80) for outputting a control signal for controlling the power supply of the heating wire (10) using a resistance value converted by the current value measured by the current monitoring unit (20), and a heater control unit (90) for controlling the power applied to the heating wire (10) according to the control signal of the main control unit (80).

In addition, the device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to another embodiment of the present invention may further include a voltage monitoring unit (40) that is connected to the main control unit (80) and measures and transmits the voltage of the heating wire (10).

The above current monitoring unit (20) and voltage monitoring unit (40) can be implemented by applying various configurations such as a current transformer, a voltage potential transformer, a shunt, and a Hall sensor.

If the current monitoring unit (20) and voltage monitoring unit (40) above are configured in multiples, it is possible to detect input voltage and input current, output voltage and output current, and thereby increase the stability of measurement and control.

According to another embodiment of the present invention, a device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire may further include a temperature sensor (65) that measures the temperature near where the heating wire (10) is installed, and a temperature monitoring unit (60) that transmits the temperature value measured by the temperature sensor (65) to the main control unit (80).

In the above-mentioned specific resistance input step (S10), as the temperature of the heating wire (10) rises and falls when power is applied, the specific resistance value according to the heating temperature of the heating wire (10) that changes is set for each temperature section and input to the main control unit (80).

For example, in the case of nickel-chromium heating wire type 1, nickel-chromium heating wire type 2, iron-chromium heating wire type 1, and iron-chromium heating wire type 2, which are mainly used in heating appliances, it is known that they have specific resistance characteristics according to temperature, as shown in Table 1 and Fig. 3 below.

Temperature of the heating wire
(℃) Rate of change in resistance value by type of heating wire Nickel chromium class 1 Nickel chrome class 2 Ferrochromium class 1 Iron chromium type 2 20 1.000 1.000 1.000 1.000 100 1.010 1.017 1.005 1.015 200 1.025 1.037 1.013 1.035 300 1.040 1.060 1.019 1.052 400 1.065 1.080 1.022 1.071 500 1.080 1.090 1.024 1.097 600 1.062 1.100 1.030 1.125 700 1.067 1.104 1.046 1.143 800 1.072 1.106 1.050 1.155 900 1.078 1.120 1.052 1.165 1000 1.083 1.133 1.053 1.171 1100 1.090 1.143 1.055 1.175 1200 1.105 1.153 1.056 1.179

In the above Table 1, the resistance value at 20°C is taken as the standard (1.000), and the resistance value of the heating wire (10) that changes as the temperature changes is expressed as a ratio compared to the resistance value at 20°C.

In the above-mentioned specific resistance input step (S10), it is possible to measure the specific resistance value according to the heating temperature for each temperature section as shown in Table 1 above according to the type of heating wire (10), and input it to the main control unit (80) by setting it as the specific resistance value.

For example, when voltage is applied to a heating wire (10) made of a type 1 iron-chromium insulated wire of a water heater, a resistive load is applied to the heating wire (10), heat is generated in the heating wire (10), and as the heat is generated, the current of the heating wire (10) decreases, and after about 40 seconds, the temperature of the heating wire (10) increases to approximately 300°C and the current decreases by approximately 1.5%. That is, when the temperature of the heating wire (10) increases, the current of the heating wire (10) decreases, and when the temperature of the heating wire (10) decreases, the current of the heating wire (10) increases.

When the voltage applied to the heating wire (10) is constant, if the temperature of the heating wire (10) rises, the voltage measured (detected) by the current monitoring unit (20) consisting of a meter-type current transformer decreases as shown in Table 2 below, and when the load of the heating wire (10) is constant, if the voltage decreases, the current also decreases. If the voltage increases or decreases by 10%, the current increases or decreases by 1.5%.

And, when the temperature of the heating wire (10) rises, the current decreases, the resistance value increases, and the voltage of the instrument type current transformer decreases, and when the temperature of the heating wire (10) decreases, the current increases, the resistance value decreases, and the voltage of the instrument type current transformer increases.

Instrument transformer voltage (V) 188.8 187.2 186.0 185.0 Heating wire temperature (℃) 5 100 200 300

In the above Table 2, the used heating wire (10) is composed of a type 1 iron-chromium heating wire and a submersible heater with a capacity of 1.9 KW, and the instrument-type current transformer is composed of a turns ratio of 5:6000.

In the above current measurement step (S20), the current value of the heating wire (10) is measured through the current monitoring unit (20) and transmitted to the main control unit (80).

The current value measured and transmitted as described above is configured to be converted into a resistance value using Ohm's law in the main control unit (80) and used.

And, in the current measurement step (S20), after applying voltage through the current monitoring unit (20), the current amount compared to the voltage is measured for the first 2 seconds to check the power consumption of the heating wire (10), and thereafter, the current increase is measured twice (twice at 5-second intervals) every 5 seconds to estimate the current increase curve, and based on this increase curve, a reference slope table is set, the current amount compared to the temperature is calculated, and based on this, the main control unit (80) can determine the normal operation and overheating operation of the heating wire (10).

Even for underwater heaters generally used in aquariums, a minimum of 100℃ or higher is required for heating, and it takes at least 15 to 20 seconds to heat up to 100℃, so it is possible to estimate a slope curve that rises at a sufficiently constant rate.

Furthermore, in the case of a heating wire (10) used in a heater or a heater, the temperature that requires minimum heat generation is 200℃ or higher, so it is possible to estimate a slope curve that increases at a sufficiently constant rate.

Accordingly, since there is a minimum reference value whether used in water or in air, it is possible to control the heating wire (10) by distinguishing the rapid increase in current versus time according to the purpose of use in the rapidly increasing temperature value (current).

And, if the control of the heating wire (10) is performed by configuring as described above, it is possible to graph the trend line of the current according to the temperature coefficient (characteristic) of the heating wire (10) versus the voltage, and to distinguish the type of the heating wire (10) based on the analysis of the collected data, and when the type of the heating wire (10) is specified, it is possible to estimate the temperature of the heating wire (10) by the change in the amount of current, make a comparative judgment, and control the heating wire (10).

For example, in the case of nickel-chromium heating wire and iron-chromium heating wire, the current of type 1 increases relatively gradually, and that of type 2 increases relatively rapidly. Therefore, by graphing the current trend line, it is possible to determine whether the type of heating wire is type 1 or type 2.

Accordingly, it is possible to configure it so that it is possible to distinguish whether it is an appropriate temperature (appropriate current) range of the heating wire (10) according to the intended use (for an aquarium, for a heater, for a heater, etc.) of a specific type of heating wire (10) or an overheating temperature according to an abnormal situation.

And, in the resistance judgment step (S30), it is configured to judge whether the resistance value converted by the current value measured by the main control unit (80) is within or outside a certain percentage (%) range of the unique resistance value for each set temperature section.

All heating wires have a temperature coefficient, and when the temperature of the heating wire rises or falls, the current and resistance values change according to the temperature. If the change rate (%) per 100℃ is -5.0% to +5.0%, it can be applied to almost all types of heating wires.

For example, depending on the type of heating wire (10), it is possible to set the rate of change (certain rate) of resistance value according to a temperature change of 100℃ to 0.5 to 1.8%, and by appropriately applying the rate of change in resistance (rate of change in current) to the selection mode of the heating wire (10), it is possible to appropriately block the overheating temperature of the heater according to the type of product.

In addition, in the case of the first type of iron-chromium heating wire mainly used as a heating wire for heaters, referring to the rate of change in resistance value confirmed in Table 1 above, it is desirable to apply a constant rate (%) of approximately 0.5 to 0.6% as the rate of change in resistance per 100℃ temperature change (by temperature section), and when the temperature section is set to 200℃, it is desirable to apply a constant rate (%) of 1.0 to 1.2%.

And, when using the second type of iron-chromium heating wire as the heating wire, referring to the rate of change in resistance value confirmed in Table 1 above, it is desirable to apply a certain ratio (%) of approximately 1.7 to 1.8% as the rate of change in resistance per 100℃ temperature change (by temperature section).

As confirmed in Table 1 above, the resistance value of most heating wires generally changes at a constant rate (%) up to 400℃.

In particular, in the case of aquariums, since the operating environment temperature of the submersible heater is mostly below 20℃, the temperature of the heating wire starts below 20℃ and is detected at a maximum below 200℃. Accordingly, since overheating is determined below 200℃ and the voltage application is cut off, in the case of submersible heaters, the range of temperature change is not large, so it is possible to set a more accurate resistance value change rate to a certain percentage (%).

In the above heater control step (S80), if the resistance judgment step (S30) maintains a certain percentage (%) range, the main control unit (80) determines that it is a normal state and continues to supply power, and if it exceeds a certain percentage (%) range, it determines that it is an abnormal state and outputs a control signal to the heater control unit to cut off the power supply to the heating wire (10), and the heater control unit (90) is configured to control the power applied to the heating wire (10).

By configuring as above, it is possible to prevent overheating of the heating wire (10) (outside of water or similar cases, etc.) by automatically monitoring the change in current due to overheating of the heating wire (10) by setting it to a certain ratio (%) in the main control unit (80).

And, when voltage is applied under the condition that the heating wire (10) operates normally, if there is no current measured (detected) by the current monitoring unit (20) or the current value is measured unstably, it is possible to determine that there is no heating wire (10) or the connection of the heating wire (10) is poor, generate an alarm, and block the power supply.

In addition, by setting the upper current limit of the heating wire (10) and configuring it to generate an alarm and cut off the power supply when the current value measured by the current monitoring unit (20) exceeds the set upper limit, it is possible to prevent the heating wire (10) from being used in an environment with an excessive load compared to the design capacity suitable for the environment in which the heating wire (10) is used. Furthermore, by additionally configuring a mode (1KW, 2KW, 3KW, etc.) for selecting the output capacity (load) of the heating wire (10), it is possible for the user to appropriately set the heating range of the heating wire (10) according to the usage environment.

And, if the current value (output load) measured by the current monitoring unit (20) is excessively higher than the rated load, the voltage change is severe, so it is possible to configure the main control unit (80) to implement a function of generating an alarm and cutting off the power (load) when a problem such as a short circuit occurs in the load or the amount of current is zero or lower than a set range while being output due to a wire break, etc., since the rated load cut-off function is implemented.

In addition, it is also possible to set a minimum and maximum value for the current value measured by the current monitoring unit (20) to set the allowable range of current and determine whether to apply power.

For example, when power is supplied to the heating wire (10), it is also possible to configure it so that an alarm is generated when a condition for power cutoff occurs even if the current characteristics are not constant.

That is, a control signal is transmitted to apply power to the heating wire (10), but if no current is detected in the heating wire (10), the application of power is configured to be blocked.

In addition, a control signal is transmitted to apply power to the heating wire (10), but when the flow of current is not constant (intermittent current generation, spark short-circuit generation, local overheating of a constant temperature wire heater and a carbon carbon (film heater), etc.), and when the arc current waveform and the spark current waveform are detected (measured) in a state where the arc current generation condition is not present in the current monitoring unit (20) (basically, the heater rarely generates arc current and spark current in the output heating wire except when the relay is operated), an alarm is generated and the power supply is blocked.

And, if the rated current flows compared to the temperature of the heating wire (10) and then suddenly increases, a short circuit (short circuit due to tipping over and damage of the heating device, short circuit due to bending and breaking of the input power line due to long-term use, etc.) occurs in the heating wire (10), or the temperature of the heating wire (10) is not controlled by the temperature sensor (65), and the temperature sensor (65) of the submersible heater is exposed to the outside of the water, causing the heating wire (10) to overheat in an uncontrolled state, or if an overcurrent occurs due to instability of the power supply voltage and damage to the device, or if local heating occurs due to an internal problem (insulation breakdown, etc.) of the heating wire (10), an alarm is generated and the power supply is cut off.

Next, we will explain the case where it is applied to a water heater.

In the case of an underwater heater, power is supplied to the heating wire for a specific period of time in water, and the current value data is collected by utilizing a current monitoring unit (20) formed of a current transformer or the like to measure the flow of current for a specific period of time, and a temperature sensor (65) is used in parallel at a specific time to collect the change in temperature, and the collected data is converted into data in the main control unit (80) to record the change in temperature and the current change rate (load rate according to temperature change) of the heating wire (10) on a time chart, and the heat amount of the heating wire (10) is determined using this, and it is possible to determine the state of the heating wire (10), such as whether the heating wire (10) is currently operating normally and whether the heating wire (10) is operating in water or out of water.

In the case of an underwater heater, after the heating wire (10) operates for a certain period of time underwater (a state in which a constant current is maintained for more than 1 minute) and the heating wire (10) overheats outside the water and the current decreases rapidly, the main control unit (80) detects this and configures the operating conditions to cut off the power. Here, it is assumed that the voltage does not rise or fall rapidly, resulting in a rapid change in current.

And, as shown in Fig. 1, the method for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to one embodiment of the present invention may further include a voltage measurement step (S40) in which the voltage applied to the heating wire (10) is measured by a voltage monitoring unit (40) and input to the main control unit (80).

The above main control unit (80) is configured to perform a voltage judgment step (S50) to determine whether the voltage value measured by the voltage monitoring unit (40) is within or outside a certain percentage (%) of the set voltage.

In addition, if the voltage value measured in the voltage judgment step (S50) is judged to be low or high by a certain percentage (e.g., 10 to 20%) of the set voltage, it is also possible to configure the heater control step (S80) to generate an alarm and block the power supply.

By configuring as above, it is possible to prevent overheating of the heating wire (10) due to overvoltage by setting the amount of change in current according to voltage to a certain ratio (%).

When the capacity of the heating wire (10) is constant, if the voltage increases, the current increases, which increases the power consumption of the heating wire (10), the heating wire (10) overheats compared to the design value, and the lifespan of the heating wire (10) is shortened or damage occurs, and it may overheat and operate abnormally.

When the voltage monitoring unit (40) measures (detects) that a voltage higher or lower than the input voltage designed above is applied, the main control unit (80) generates an alarm and transmits a control signal to block power supply.

For example, if the connection state of the input terminal connection part of the heating wire (10) is poor and the connection is loose, or if contact heat is generated in the connected part for a long time as a result, causing a deterioration phenomenon, contact resistance occurs and the voltage applied to the heating wire (10) becomes unstable, which prevents normal heating and causes abnormal operation.

That is, in the above heater control step (S80), if an abnormal voltage phenomenon (irregular voltage fluctuation) occurs, power supply is blocked and an alarm is generated.

If the connection part (wiring, outlet, etc.) of the input terminal above is defective, the power voltage fluctuation rate occurs greatly during operation.

And, when the voltage increases while the capacity (load) of the heating wire (10) is constant, the current increases and the power consumption of the heating wire (10) increases, and the heating wire (10) is overheated more than the design value, so that the life of the heating wire (10) is shortened or damage occurs, and it overheats and operates abnormally.

When the above current monitoring unit (20) and voltage monitoring unit (40) are configured together, the main control unit (80) can compare and analyze data on the change in current of the heating wire (10) due to the applied voltage and the change in current due to overheating of the heating wire (10), thereby more accurately identifying the state of the heating wire (10) and preventing unnecessary overheating of the heating wire (10).

For example, it is possible to prevent overheating due to voltage and changes in the surrounding environment of the heating wire (10) (such as abnormal conditions other than being in a liquid), and to prevent overheating and abnormal operation under mixed conditions of voltage and current.

And, if the current monitoring unit (20) and the voltage monitoring unit (40) are configured together, it is possible to calculate the power consumption of the product (purpose) using the voltage and current measured from the current monitoring unit (20) and the voltage monitoring unit (40) during a certain period of time (seconds) after power is supplied, and this power consumption becomes the capacity (KW) of the heating wire (10), and it is possible to estimate the maximum value of the heat generation temperature (use temperature) according to the purpose (for aquarium, for heater, for heater, etc.) with respect to the temperature of the heating wire (10) according to the capacity of the heating wire (10).

For example, in the case of an aquarium, when the maximum operating temperature is 100°C, the heating temperature of the heating wire (10) is approximately 150 to 200°C, in the case of a heater, when the discharge temperature is approximately 100 to 200°C, the temperature of the heating wire (10) is approximately 200 to 300°C, and in the case of an electric heater, when the maximum heating temperature is approximately 300 to 400°C, the temperature of the overheated heating wire (10) is approximately 500 to 600°C.

Accordingly, since the value of overheating can be known depending on the intended use, by checking the current amount compared to the voltage supplied within the first few seconds, it is possible to estimate the KW capacity of the heating wire (10) currently in use, and by analyzing the continuous data thereafter, it is possible to estimate the temperature of the heating wire (10) based on the current amount compared to the voltage according to the temperature coefficient of the heating wire (10).

From the above, it is possible to estimate whether the temperature of the heating wire (10) is a normal temperature according to the purpose or overheating due to a malfunction (environmental change, short circuit, damage, etc.).

In addition, the main control unit (80) can be configured to first determine the rated voltage and rated current after power is supplied, check whether the voltage and current are rated, and confirm whether it is a normal operating load (in the case of an integrated load, whether it is particularly high or low compared to the set current), and generate an alarm and cut off the power supply if it is not the rated voltage or rated current.

And, as shown in FIG. 2, the method for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire according to one embodiment of the present invention may further include a temperature measurement step (S60) of transmitting a measurement value of a temperature sensor (65) measuring the temperature near where a heating wire (10) is installed to a main control unit (80) through a temperature detection unit (60), and a temperature judgment step (S70) of the main control unit (80) of determining whether the measured temperature value is within or outside a set temperature range.

The above heater control step (S80) can also be configured to block power supply if the temperature measured in the above temperature judgment step (S70) is determined to be outside the set temperature range.

In the above, it is also possible to install a temperature sensor (65) together with a temperature detection sensor for measuring and detecting temperature and a water detection sensor for detecting whether there is water (liquid) (whether the temperature sensor (65) is in or out of water).

The temperature detection unit (60) transmits the measurement value transmitted from the temperature sensor (65) to the main control unit (80), and the main control unit (80) analyzes the measurement value of the temperature detection unit (60) in the temperature judgment step (S70) to determine whether the temperature of the water is within the set temperature range or an abnormal range, or whether there is water (liquid) around the temperature sensor (65) installed or not.

As described above, if the temperature sensor (65) and the temperature detection unit (60) are configured together with the current monitoring unit (20) and/or the voltage monitoring unit (40), in the case of the heating wire (10) used in the underwater heater, there are cases where the water detection sensor of the temperature sensor (65) malfunctions depending on the sensitivity of the sensor depending on the environment of the place of use (such as in water containing a lot of contaminants or foreign substances). Therefore, it is possible to configure the overheating prevention function using the current monitoring unit (20) to operate complementarily with the water detection function, so that it is possible to prevent overheating of the heating wire (10) more reliably.

Furthermore, since it is possible to determine whether the heating wire (10) is overheated by checking the temperature change and current change of the heating wire (10) together, it is possible to control the temperature and overheating of the heating wire (10) more effectively and accurately.

In addition, although not shown in the drawing, when a product including a heating wire (10) is used and the condition of the heating wire (10) is to be known or when a part of the product is replaced and the condition of the heating wire (10) is to be checked and identified, it is also possible to configure the product so that the stability and safety can be checked by installing a specific mode (auto-scanning mode) switch.

In the above, the auto-scanning mode can be implemented as a function that allows the user to select and set initial values or check the status when necessary.

The above auto-scanning mode can also be configured to automatically set at regular time intervals to check whether it is operating normally.

It is also possible to configure the values detected in the above auto-scanning mode to be applied as default values in subsequent operations and used as default values for monitoring overheating of the heating wire (10) and voltage and current that occur during temperature control.

In the above auto-scanning mode, it is possible to check the stability and value of the input voltage and output voltage, the capacity and current value and stability of the output load of the heating wire (10), etc.

In the above auto-scanning mode, if an element exceeding the initially designed (set) capacity or being unstable is detected, an error alarm is generated, and if it is within the normal range, the voltage and current values are displayed to indicate the current status.

It is also possible to configure the above auto-scanning mode to automatically run at regular intervals to enable automatic checking.

Although the above has described preferred embodiments of the method and device for preventing overheating and controlling the heating temperature of a heater using the temperature characteristics of a heating wire according to the present invention, the present invention is not limited thereto, and various modifications may be made within the scope of the claims, the description of the invention, and the attached drawings, and this also falls within the scope of the present invention.

10 - Heating wire, 20 - Current monitoring unit, 40 - Voltage monitoring unit, 60 - Temperature sensing unit
65 - Temperature sensor, 80 - Main control unit, 90 - Heater control unit

Claims (12)

As the temperature of the heating wire rises and falls as power is applied, a unique resistance input step for setting the unique resistance value according to the heating temperature of the heating wire for each temperature section and inputting it to the main control unit, a current measurement step for measuring the current value of the heating wire and inputting it to the main control unit, a resistance judgment step for determining whether the resistance value converted by the measured current value is within or outside a certain percentage (%) range of the unique resistance value for each set temperature section in the main control unit, and a heater control step for outputting a control signal to the heater control unit so that if the resistance value is maintained within a certain percentage (%) range in the resistance judgment step, it is determined to be a normal state and power is continuously supplied, and if it is outside a certain percentage (%) range, it is determined to be an abnormal state and power supply to the heating wire is cut off, and the heater control unit controls the power applied to the heating wire.
A method for preventing overheating of a heater and controlling the heating temperature using the temperature characteristics of a heating wire, wherein the current measurement step is configured to graph a current trend line according to the temperature coefficient (characteristics) of the heating wire versus the voltage using data measured through a current monitoring unit, and to distinguish the type of the heating wire based on analysis of the collected data, and the resistance judgment step and heater control step are configured to estimate the temperature of the heating wire by a change in the amount of current when the type of the heating wire is specified, compare and judge it, and control the heating wire. In claim 1,
A method for preventing overheating of a heater and controlling the heating temperature by using the temperature characteristics of a heating wire, wherein, after applying voltage through a current monitoring unit in the above current measurement step, the current amount compared to the voltage is measured for the first 2 seconds to check the power consumption of the heating wire, and thereafter, the current increase is measured twice (twice at 5-second intervals) every 5 seconds to estimate the current increase curve, and a reference slope table is set based on this increase curve, the current amount compared to the temperature is calculated, and the main control unit determines the normal operation and overheating operation of the heating wire based on this. delete In claim 1 or claim 2,
It further includes a voltage measurement step for measuring the voltage applied to the heating wire and inputting it to the main control unit, and a voltage judgment step for determining whether the voltage value measured by the main control unit is within or outside a certain percentage (%) of the set voltage range.
A method for preventing overheating of a heater and controlling the heating temperature by using the temperature characteristics of a heating wire, wherein the heater control step is configured to generate an alarm and cut off the power supply if the voltage value measured in the voltage judgment step is judged to be low or high beyond a certain percentage range of the set voltage. In claim 1 or claim 2,
The temperature measurement step for transmitting the measured value of the temperature sensor measuring the temperature near the installed heating wire to the main control unit, and the main control unit further includes a temperature judgment step for determining whether the measured temperature is out of the set temperature range.
The above heater control step is a method for preventing overheating of a heater and controlling the heating temperature by using the temperature characteristics of a heating wire, which is configured to block the application of power if the temperature measured in the above temperature judgment step is determined to be outside the set temperature range. The present invention relates to a heating element comprising: a current monitoring unit for measuring the current of a heating wire; a main control unit for determining whether the resistance value converted by the current value measured by the current monitoring unit is within or outside a certain percentage (%) of the inherent resistance value of the heating wire for each set temperature section; and outputting a control signal to continuously supply power if the resistance value is within a certain percentage (%) range and to cut off the power supply to the heating wire if the resistance value is outside the certain percentage (%) range and to determine that the current is in a normal state; a heater control unit for controlling the power applied to the heating wire according to the control signal of the main control unit; a voltage monitoring unit connected to the main control unit for measuring and transmitting the voltage of the heating wire; a temperature sensor for measuring the temperature in the vicinity of where the heating wire is installed; and a temperature monitoring unit for transmitting the temperature value measured by the temperature sensor to the main control unit.
A device for preventing overheating and controlling the heating temperature of a heater by utilizing the temperature characteristics of a heating wire, wherein the current monitoring unit and the temperature monitoring unit are configured together so that the main control unit compares and analyzes the measured values of the current monitoring unit and the measured values of the temperature monitoring unit and outputs a control signal. delete In claim 6,
A device for preventing overheating and controlling the heating temperature of a heater by utilizing the temperature characteristics of a heating wire comprising a plurality of the above current monitoring units and voltage monitoring units. In claim 6 or claim 8,
A device for preventing overheating and controlling the heating temperature of a heater by utilizing the temperature characteristics of a heating wire, wherein the current monitoring unit and the voltage monitoring unit are configured together so that the main control unit compares and analyzes the measured values of the current monitoring unit and the measured values of the voltage monitoring unit and outputs a control signal. delete delete In claim 6,
The above main control unit is configured to further perform an auto-scanning mode, which is a function that allows the user to select and set initial values when necessary or to automatically set and check the status at regular time intervals.
The auto-scanning mode is configured to check the stability and value of the input voltage and output voltage, the capacity and current value of the heating wire output load, and the stability.
A device for controlling the overheating of a heater and the heating temperature by using the temperature characteristics of a heating wire, wherein the value detected in the above auto-scanning mode is applied as a default value in subsequent operations and is used as a default value for monitoring overheating of a heating wire and voltage and current that occurs during temperature control.