Heat tracing band control method and system and self-temperature-limiting heat tracing band

Abstract

The invention provides a heat tracing band control method and system and a self-temperature-limiting heat tracing band. The method comprises the following steps: acquiring a detection temperature corresponding to a self-temperature-limiting heat tracing band body; determining a target compensation resistance value corresponding to the detection temperature; and setting the resistance value of a variable resistance module as the target compensation resistance value, so that the current value of a branch where the self-temperature-limiting heat tracing band body is located is smaller than a preset current threshold value. The temperature detection module is arranged to detect the temperature of the self-temperature-limiting heat tracing band body, so that the resistance value condition of the self-temperature-limiting heat tracing band body is determined, and the total resistance value of a branch where the self-temperature-limiting heat tracing band body is located is adjusted by adjusting the resistance value of the variable resistance module connected with the self-temperature-limiting heat tracing band body in series. The current of the branch is limited, the situation that the current is too large due to the fact that the resistance value of the self-temperature-limiting heat tracing band body is too low in a low-temperature environment is avoided, and the safety of the self-temperature-limiting heat tracing band is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric heating, and in particular to a heating tape control method and system, and a self-limiting temperature heating tape. Background Art

[0002] The self-limiting temperature heating cable is composed of conductive plastic, two parallel busbars and an insulating layer. This heating cable is made of a high molecular conductive composite material. When the ambient temperature rises, the polymer micromolecules expand and the carbon particles gradually separate, causing the circuit to be interrupted, the resistance to increase, and the heating cable automatically reduces the power output; when the ambient temperature drops, the distance between the polymer particles shrinks and becomes smaller, and the carbon particles are connected accordingly to form a circuit, and the heating power of the heating cable automatically increases; when the ambient temperature is at a certain stable state, the system will achieve stable heat output, making it temperature self-limiting.

[0003] Self-limiting temperature heating cables are typically used in low-temperature conditions. For example, after the shell and tube are filled with water, the water freezes below 0°C, expands in volume, and can burst the shell and tube, causing damage to the unit. In this case, the self-limiting temperature heating cable is needed to provide heating to maintain the temperature of the shell and tube. However, when starting in a low-temperature environment, the resistance of the self-limiting temperature heating cable is very small, which will cause a large starting current and damage the circuit. Summary of the Invention

[0004] The main purpose of the present invention is to provide a heating tape control method, system and self-limiting temperature heating tape, aiming to solve the problem in the prior art that when starting in a low temperature environment, the resistance of the self-limiting temperature heating tape is very small, resulting in a large starting current.

[0005] To achieve the above object, the present invention provides a heating tape control method, the heating tape control method comprising:

[0006] Get the detection temperature corresponding to the self-limiting temperature heating tape body;

[0007] determining a target compensation resistance value corresponding to the detected temperature;

[0008] The resistance value of the variable resistor module is set to the target compensation resistance value so that the current value of the branch where the self-limiting temperature heating belt body is located is less than a preset current threshold.

[0009] Optionally, determining the target compensation resistance corresponding to the detected temperature includes:

[0010] Determining a body resistance value corresponding to the detected temperature, wherein the body resistance value is the resistance value of the self-limiting temperature heating belt corresponding to the detected temperature;

[0011] The target compensation resistance corresponding to the body resistance is determined, wherein a sum of the target compensation resistance and the body resistance is greater than or equal to a minimum resistance threshold.

[0012] Optionally, determining the target compensation resistance corresponding to the body resistance includes:

[0013] Obtaining the minimum resistance threshold;

[0014] The difference between the minimum resistance threshold and the body resistance is used as the target compensation resistance.

[0015] Optionally, determining a target compensation resistance corresponding to the detected temperature includes:

[0016] Determine whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance value corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold;

[0017] If the detected temperature is lower than the preset temperature threshold, a target compensation resistance value corresponding to the detected temperature is determined.

[0018] Optionally, the determining of the target compensation resistance corresponding to the detected temperature includes:

[0019] Determine whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance value corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold;

[0020] If the detected temperature is greater than or equal to a preset temperature threshold, the bypass module is controlled to bypass the variable resistance module.

[0021] To achieve the above-mentioned objectives, the present invention also provides a heating tape control system, which is applied to the heating tape control method described above, wherein the heating tape control system is connected to the self-limiting temperature heating tape body, and the heating tape control system includes a temperature detection module and a variable resistance module; the temperature detection end of the temperature detection module is correspondingly arranged to the self-limiting temperature heating tape body, the first output end of the temperature detection module is connected to the control end of the variable resistance module, and the variable resistance module is connected in series with the self-limiting temperature heating tape body.

[0022] Optionally, the variable resistor module includes a rheostat unit, and the rheostat unit includes a sliding rheostat and a drive motor; wherein:

[0023] The sliding rheostat is connected in series with the self-limiting temperature heating belt body; the sliding end of the sliding rheostat is connected to the driving motor, and the control end of the driving motor serves as the control end of the rheostat unit.

[0024] Optionally, the heating tape control system further comprises a bypass module; the bypass module comprises a relay; wherein:

[0025] The coil of the relay is connected to the output end of the temperature detection module; and a group of normally open contacts of the relay is connected in parallel with the variable resistance module.

[0026] Optionally, the temperature detection module includes a temperature sensor and a controller; wherein:

[0027] The temperature sensor is arranged in contact with the self-limiting temperature heating belt body, the output end of the temperature sensor is connected to the input end of the controller, and the output end of the controller serves as the output end of the temperature detection module.

[0028] To achieve the above object, the present invention further provides a self-limiting temperature heating belt, which includes a self-limiting temperature heating belt body and the heating belt control system as described above.

[0029] The present invention proposes a heating tape control method, system, and self-limiting temperature heating tape, which obtain a detected temperature corresponding to the self-limiting temperature heating tape body; determine a target compensation resistance corresponding to the detected temperature; and set the resistance of a variable resistor module to the target compensation resistance so that the current value of the branch where the self-limiting temperature heating tape body is located is less than a preset current threshold. By setting a temperature detection module to detect the temperature of the self-limiting temperature heating tape body, the resistance of the self-limiting temperature heating tape body is determined. Then, by adjusting the resistance of the variable resistor module connected in series with the self-limiting temperature heating tape body, the total resistance of the branch where the self-limiting temperature heating tape body is located is adjusted, thereby limiting the current in the branch, avoiding excessive current caused by the low resistance of the self-limiting temperature heating tape body in a low temperature environment, and improving the safety of the self-limiting temperature heating tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 Schematic diagram of the flow of the first embodiment of the heating tape control method of the present invention;

[0034] Figure 2 This is a module structure diagram of the heating tape control system of the present invention;

[0035] Figure 3 This is the overall structural diagram of the heating cable control system of the present invention;

[0036] Figure 4 Schematic diagram of the module structure of the temperature detection module of the present invention.

[0037] Description of Figure Numbers:

[0038]

[0039] DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0043] The present invention provides a heating tape control method, which is applied to a heating tape control system. Figure 1 , Figure 1 This is a flow chart of a first embodiment of a heating tape control method according to the present invention, wherein the method comprises the following steps:

[0044] Step S10, obtaining the detection temperature corresponding to the self-limiting temperature heating belt body;

[0045] The self-limiting temperature heating tape body is the part of the self-limiting temperature heating tape that realizes the self-limiting temperature heating tape function.

[0046] The detection temperature is the temperature of the self-limiting temperature heating belt body; the specific detection temperature can be obtained by collecting the temperature of the self-limiting temperature heating belt body through the temperature detection module.

[0047] Step S20, determining a target compensation resistance value corresponding to the detected temperature;

[0048] Step S30: setting the resistance of the variable resistor module to the target compensation resistance so that the current value of the branch where the self-limiting temperature heating belt body is located is less than a preset current threshold.

[0049] The target compensation resistance indicates the compensation for the resistance of the self-limiting temperature heating tape body; it can be understood that the self-limiting temperature heating tape body is made of temperature-sensitive material, therefore, the resistance of the self-limiting temperature heating tape body will change with its own temperature, and when the resistance of the self-limiting temperature heating tape body is too small, the current in the branch where the self-limiting temperature heating tape body is located will be too large, therefore, in order to ensure that the current of the branch where the self-limiting temperature heating tape body is located is within the allowable range, in this embodiment, the target compensation resistance corresponding to the detected temperature is determined, and the resistance of the variable resistor module is set to the target compensation resistance, it can be understood that the variable resistor module is connected in series with the self-limiting temperature heating tape body, therefore, when the resistance of the variable resistor module is set to the target compensation resistance, the total resistance of the branch where the self-limiting temperature heating tape body is located can be increased, thereby reducing the current in the branch where the self-limiting temperature heating tape body is located.

[0050] The preset current threshold is the maximum current allowed in the branch where the self-limiting temperature heating cable is located. When the current in the branch where the self-limiting temperature heating cable is located is less than the preset current threshold, the branch current will not damage the circuit or its components. When the current in the branch where the self-limiting temperature heating cable is located is greater than or equal to the preset current threshold, the branch current may damage the circuit and its components. In this embodiment, by setting the target compensation resistance value so that the current value in the branch where the self-limiting temperature heating cable is located is less than the preset current threshold, the problem of overcurrent caused by the self-limiting temperature heating cable's resistance being too low when the temperature is too low is avoided, thereby improving circuit safety.

[0051] The specific value of the preset current threshold can be set based on actual application scenarios, such as the current that the line can withstand, the current that the electrical appliance can withstand, etc.

[0052] It can be understood that in this embodiment, the resistance of the branch where the self-limiting temperature heating tape body is located is adjusted by setting a variable resistor module, thereby achieving a current limiting effect. Compared with the method of replacing the cable or device with a type that is more current-resistant, this embodiment does not need to increase the cost of the cable or device. At the same time, since the current of the self-limiting temperature heating tape body is very small in most cases, replacing the cable or device with a type that is more current-resistant causes a waste of resources; while this embodiment maintains the original settings of the self-limiting temperature heating tape body and related devices unchanged, by adding a temperature detection module and a variable resistor module to achieve the suppression of excessive driving current, the cost increase is relatively low, and at the same time, it does not cause waste of resources.

[0053] To facilitate subsequent description, the heating tape control system used in the heating tape control method of the present application is first described.

[0054] The heating tape control system is connected to the self-limiting temperature heating tape body 100, and the heating tape control system includes a temperature detection module 200 and a variable resistance module 300; the temperature detection end of the temperature detection module 200 is correspondingly arranged to the self-limiting temperature heating tape body 100, and the first output end of the temperature detection module 200 is connected to the control end of the variable resistance module 300, and the variable resistance module 300 is connected in series with the self-limiting temperature heating tape body 100.

[0055] The temperature detection module 200 detects the temperature of the self-limiting temperature heating belt body 100 to obtain the detected temperature, and after determining the target compensation resistance value based on the detected temperature, sends a control signal corresponding to the target compensation resistance value to the variable resistor module 300 to set the resistance value of the variable resistor module 300 to the target compensation resistance value.

[0056] Since the variable resistor module 300 is connected in series with the self-limiting temperature heating tape body 100, the resistance setting of the variable resistor module 300 can increase the total resistance of the branch where the self-limiting temperature heating tape body 100 is located, thereby reducing the current in the branch where the self-limiting temperature heating tape body 100 is located.

[0057] Furthermore, the variable resistance module 300 includes a variable resistor unit, wherein:

[0058] The control end of the variable resistor unit is connected to the first output end of the temperature detection module 200 , and the variable resistor unit is connected in series with the self-limiting temperature heating belt body 100 .

[0059] In this embodiment, a variable resistor unit is used as the variable resistor module 300. It can be understood that the variable resistor unit can adjust its own resistance, thereby realizing the resistance adjustment needs of the variable resistor module 300; the control end of the variable resistor unit is connected to the first output end of the temperature detection module 200. After determining the target compensation resistance, the temperature detection module 200 sends a corresponding control signal to the variable resistor unit, so that the resistance of the variable resistor unit can be adjusted to the target compensation resistance.

[0060] The specific type of the rheostat used in the rheostat unit can be set based on actual needs, such as a sliding rheostat 310, a potentiometer, a digital rheostat, etc.

[0061] Furthermore, the rheostat unit includes a sliding rheostat 310 and a driving motor; wherein:

[0062] The sliding rheostat 310 is connected in series with the self-limiting temperature heating belt body 100; the sliding end of the sliding rheostat 310 is connected to the driving motor, and the control end of the driving motor serves as the control end of the rheostat unit.

[0063] In this embodiment, a sliding rheostat 310 is used to construct a rheostat unit; it can be understood that the sliding rheostat 310 adjusts its own resistance by moving the sliding end, and the two connection ends of the sliding rheostat 310 that can achieve resistance change are connected in series to the branch where the self-limiting temperature heating belt body 100 is located, so that when the sliding end moves, the resistance of the sliding rheostat 310 in the branch can be adjusted.

[0064] In this embodiment, the sliding end of the sliding rheostat 310 is controlled by setting a drive motor; the drive motor is controlled by the control signal output by the temperature detection module 200 and moves; a transmission relationship can be established between the drive motor and the sliding end of the sliding rheostat 310. When the drive motor rotates, the sliding end of the sliding rheostat 310 can be controlled to move, and the temperature detection module 200 can specifically set the corresponding relationship between the drive motor position, the position of the sliding end of the sliding rheostat 310, and the resistance value of the sliding rheostat 310. After determining the target compensation resistance value, the corresponding drive motor position is obtained by matching the target compensation resistance value, and then the control signal corresponding to the drive motor position is determined, and the control signal is sent to the drive motor, so that the drive motor adjusts the sliding end position of the sliding rheostat 310 to the position corresponding to the target compensation resistance value.

[0065] Other types of varistors may have specific settings based on how they are adjusted.

[0066] Furthermore, the heating tape control system further includes a bypass module; a control end of the bypass module is connected to the second output end of the temperature detection module 200 , and the bypass module is connected in parallel with the variable resistance module 300 .

[0067] It can be understood that the variable resistor itself is an energy-consuming device that does not do useful work. Therefore, when the variable resistor is connected to the circuit, additional power consumption will be generated. The purpose of setting the variable resistor is to avoid the problem of excessive current caused by the self-limiting temperature heating belt having too low resistance. Therefore, when the self-limiting temperature heating belt body 100 does not have too low resistance, the variable resistor is not necessary to be used. Therefore, the variable resistor can be bypassed at this time to avoid power consumption generated by the variable resistor.

[0068] Specifically, in this embodiment, a bypass module is provided, and the bypass module is controlled by the temperature detection module 200;

[0069] When the temperature detection module 200 detects that the detected temperature is lower than the preset temperature threshold, it means that the resistance of the self-limiting temperature heating cable body 100 is relatively small, which will cause the current in the branch to be lower than the preset current threshold. In this case, the variable resistor is required to provide additional resistance to suppress the current. Therefore, the variable resistor module 300 is inserted into the branch where the self-limiting temperature heating cable body 100 is located, and the resistance of the variable resistor module 300 is adjusted by detecting the temperature to achieve current suppression.

[0070] When the temperature detection module 200 detects that the detection temperature is greater than or equal to the preset temperature threshold, it means that the resistance of the self-limiting temperature heating tape body 100 is relatively large, and the current of the branch will not be less than the preset current threshold. In this case, even if there is no variable resistor to provide additional resistance, the current will not be too large. Therefore, the variable resistor module 300 can be bypassed by the bypass module at this time, thereby avoiding power consumption of the variable resistor.

[0071] Furthermore, the bypass module includes a relay K1; wherein:

[0072] The coil of the relay K1 is connected to the output end of the temperature detection module 200 ; a group of normally open contacts of the relay K1 is connected in parallel with the variable resistance module 300 .

[0073] In this embodiment, the function of the bypass module is realized by the relay K1.

[0074] When the temperature detection module 200 detects that the detection temperature is lower than the preset temperature threshold, it does not output voltage to the coil of the relay K1. At this time, the coil of the relay K1 is de-energized, the normally open contact of the relay K1 is disconnected, and the variable resistor module 300 is connected to the branch where the self-limiting temperature heating cable body 100 is located;

[0075] When the temperature detection module 200 detects that the detection temperature is greater than or equal to the preset temperature threshold, it outputs voltage to the coil of relay K1. At this time, the coil of relay K1 is energized, the normally open contact of relay K1 is closed, and the self-limiting temperature heating belt body 100 is bypassed.

[0076] Furthermore, the bypass module includes a controllable switch; wherein:

[0077] The control end of the controllable switch serves as the control end of the bypass module and is connected to the second output end of the temperature detection module 200 . The controllable switch is connected in parallel with the variable resistance module 300 .

[0078] In this embodiment, the function of the bypass module is realized by a controllable switch.

[0079] When the temperature detection module 200 detects that the detected temperature is lower than the preset temperature threshold, it outputs a control signal indicating disconnection to the controllable switch. At this time, the controllable switch is disconnected, and the variable resistor module 300 is connected to the branch where the self-limiting temperature heating cable body 100 is located;

[0080] When the temperature detection module 200 detects that the detected temperature is greater than or equal to the preset temperature threshold, it outputs a control signal indicating closing to the controllable switch. At this time, the controllable switch is closed and the self-limiting temperature heating tape body 100 is bypassed.

[0081] The specific type and structure of the bypass module can also be set based on actual needs.

[0082] Furthermore, the temperature detection module 200 includes a temperature sensor 210 and a controller 220; wherein:

[0083] The temperature sensor 210 is arranged in contact with the self-limiting temperature heating belt body 100 , and the output end of the temperature sensor 210 is connected to the input end of the controller 220 , and the output end of the controller 220 serves as the output end of the temperature detection module 200 .

[0084] The temperature sensor 210 is used to detect the temperature of the self-limiting temperature heating belt body 100; the specific type of the temperature sensor 210 can be set based on actual needs; the temperature sensor 210 is set in contact with the self-limiting temperature heating belt body 100 to realize temperature detection of the self-limiting temperature heating belt body 100.

[0085] The temperature sensor 210 sends the detected temperature to the controller 220. The controller 220 determines the target compensation resistance of the variable resistor module 300 and the state of the bypass module based on the detected temperature, and sends the target compensation resistance to the variable resistor module 300 and a corresponding control signal to the bypass module.

[0086] The specific setting of the temperature sensor 210 can also be set based on the actual type used. For example, for a temperature detection device that does not require contact, such as an infrared thermometer, the temperature measurement area of ​​the temperature detection device can be set on the self-limiting temperature heating tape body 100.

[0087] Furthermore, the tropical control system further includes a voltage detection module, wherein:

[0088] The detection end of the voltage detection module is connected to the power supply of the self-limiting temperature heating belt body 100 , and the output end of the voltage detection module is connected to the voltage detection end of the temperature detection module 200 .

[0089] It can be understood that the current on the branch where the self-limiting temperature heating belt body 100 is located is determined by the voltage and resistance. Generally, the voltage on the branch where the self-limiting temperature heating belt body 100 is located is fixed, such as 220V. However, in special scenarios, undervoltage or voltage instability may occur. Therefore, in order to accurately determine the target compensation resistance, a voltage detection module is also provided in this embodiment to detect the actual voltage of the branch where the self-limiting temperature heating belt body 100 is located to obtain a detection voltage; after obtaining the detection voltage, the minimum resistance threshold is calculated based on the detection voltage and the preset current threshold, and the body resistance corresponding to the self-limiting temperature heating belt body 100 is determined by detecting the temperature, and the difference obtained by subtracting the body resistance from the minimum resistance threshold is used as the target compensation resistance.

[0090] The specific type of the voltage detection module can be set based on actual needs.

[0091] In this embodiment, a temperature detection module is provided to detect the temperature of the self-limiting temperature heating belt body, thereby determining the resistance of the self-limiting temperature heating belt body. Then, by adjusting the resistance of the variable resistor module connected in series with the self-limiting temperature heating belt body, the total resistance of the branch where the self-limiting temperature heating belt body is located is adjusted, thereby limiting the current in the branch, avoiding excessive current caused by the low resistance of the self-limiting temperature heating belt body in a low temperature environment, and improving the safety of the self-limiting temperature heating belt.

[0092] Furthermore, in a second embodiment of the heating tape control method of the present invention proposed based on the first embodiment of the present invention, step S20 includes the following steps:

[0093] Step S21, determining a body resistance value corresponding to the detected temperature, wherein the body resistance value is the resistance value of the self-limiting temperature heating belt corresponding to the detected temperature;

[0094] Step S22 , determining the target compensation resistance corresponding to the body resistance, wherein the sum of the target compensation resistance and the body resistance is greater than or equal to a minimum resistance threshold.

[0095] It can be understood that the self-limiting temperature heating tape is made of heat-sensitive materials. Therefore, the relationship between the temperature and resistance of the self-limiting temperature heating tape body is determined. Generally, the self-limiting temperature heating tape body is made of positive temperature coefficient material; the corresponding relationship between the temperature and resistance of the self-limiting temperature heating tape body is set in advance in the temperature detection module; after the detection temperature is determined, the body resistance can be matched.

[0096] The minimum resistance threshold is the total resistance of the branch when the current of the branch is a preset current threshold.

[0097] It can be understood that the purpose of setting up the variable resistance module is to avoid excessive current. Therefore, when the sum of the main body resistance and the target compensation resistance is greater than or equal to the minimum resistance threshold, the current in the branch can be made greater than the preset current threshold. Therefore, in this embodiment, the target compensation resistance is determined based on the minimum resistance threshold and the main body resistance.

[0098] Furthermore, the step S22 includes the steps of:

[0099] Step S221, obtaining the minimum resistance threshold;

[0100] Step S222 : subtracting the body resistance from the minimum resistance threshold value as the target compensation resistance.

[0101] It can be understood that the larger the target compensation resistance, the greater the power consumption generated by the variable resistor module; however, when the sum of the target compensation resistance and the body resistance is equal to the minimum resistance threshold, the branch current can be kept within the allowable range. Therefore, in order to reduce the power consumption of the variable resistor module as much as possible, in this embodiment, the sum of the target compensation resistance and the body resistance is set to the minimum resistance threshold, so that the target compensation resistance is the minimum value based on the ability to achieve the current limiting requirement, thereby reducing the power consumption of the variable resistor module while avoiding overcurrent.

[0102] Furthermore, in a third embodiment of the heating tape control method of the present invention proposed based on the first embodiment of the present invention, step S20 includes the following steps:

[0103] Step S23, determining whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold;

[0104] Step S24 : If the detected temperature is lower than the preset temperature threshold, determining a target compensation resistance value corresponding to the detected temperature.

[0105] When the temperature detection module detects that the detected temperature is lower than the preset temperature threshold, it means that the resistance of the self-limiting temperature heating tape body is small, which will make the current in the branch where it is located lower than the preset current threshold. In this case, the variable resistor is required to provide additional resistance to suppress the current. Therefore, the variable resistor module is inserted into the branch where the self-limiting temperature heating tape body is located, and the resistance of the variable resistor module is adjusted by detecting the temperature to achieve current suppression.

[0106] Furthermore, the step S24 includes the following steps:

[0107] Step S241, determining whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold;

[0108] Step S242: If the detected temperature is greater than or equal to the preset temperature threshold, control the bypass module to bypass the variable resistance module.

[0109] When the temperature detection module detects that the detection temperature is greater than or equal to the preset temperature threshold, it means that the resistance of the self-limiting temperature heating tape body is relatively large, and the current of the branch where it is located will not be less than the preset current threshold. In this case, even if there is no variable resistor to provide additional resistance, the current will not be too large. Therefore, the variable resistor module can be bypassed by the bypass module at this time, thereby avoiding power consumption of the variable resistor.

[0110] The following is an explanation of the overall implementation principle of this application:

[0111] The self-limiting temperature heating cable body is connected in series with the sliding rheostat, which is connected in parallel with the normally open contact of the relay. Assuming that the maximum current that the circuit can withstand for a long time, that is, the preset current threshold is I0, and the circuit voltage is constant at U0, the corresponding minimum resistance threshold R0 is:

[0112]

[0113] When the self-limiting temperature heating tape body is in a low temperature state, its body resistance R is very small, R<R0. At this time, R0 is the sum of the resistance values ​​of the sliding rheostat and the self-limiting temperature heating tape body.

[0114] When the temperature changes, the resistance of the self-limiting temperature heating tape body changes, and the resistance of the sliding rheostat changes synchronously through adjustment by the controller, so that the sum of the resistances of the two is always R0; when the resistance R of the self-limiting temperature heating tape body = R0, the temperature T0 of the self-limiting temperature heating tape body is the preset temperature threshold.

[0115] A temperature sensor is provided on the self-limiting temperature heating belt body, which can monitor the temperature T of the self-limiting temperature heating belt body in real time and feed the temperature signal back to the controller. The controller can compare T with the preset temperature T0 in real time.

[0116] When T≤T0, the controller controls the rheostat according to the above method to achieve constant current starting of the self-limiting temperature heating belt body;

[0117] When T>T0, the controller outputs an electrical signal to the coil of the relay. The coil of the relay is energized, the normally open contact is closed, and the two ends of the sliding rheostat are short-circuited to achieve bypass. At this time, only the self-limiting temperature heating tape body is working in the circuit.

[0118] This system enables the self-limiting temperature heating tape body to maintain a constant current state during startup. When the temperature is high and the resistance of the self-limiting temperature heating tape body is large enough that the current in the circuit is within the tolerable range, the sliding rheostat can be short-circuited without affecting the normal operation of the self-limiting temperature heating tape body.

[0119] It should be noted that for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0120] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0121] The present application also provides a heating tape control system for implementing the above-mentioned heating tape control method, wherein the heating tape control system is connected to a self-limiting temperature heating tape body, and the heating tape control system includes a temperature detection module and a variable resistor module; the temperature detection end of the temperature detection module is correspondingly arranged with the self-limiting temperature heating tape body, the first output end of the temperature detection module is connected to the control end of the variable resistor module, and the variable resistor module is connected in series with the self-limiting temperature heating tape body; the temperature detection module includes:

[0122] The first acquisition module is used to obtain the detection temperature corresponding to the self-limiting temperature heating belt body;

[0123] A first determining module is used to determine a target compensation resistance value corresponding to the detected temperature;

[0124] The first setting module is used to set the resistance value of the variable resistor module to the target compensation resistance value so that the current value of the branch where the self-limiting temperature heating belt body is located is less than a preset current threshold.

[0125] This heating tape control system detects the temperature of the self-limiting temperature heating tape body by setting a temperature detection module, thereby determining the resistance condition of the self-limiting temperature heating tape body, and then adjusting the resistance of the variable resistor module connected in series with the self-limiting temperature heating tape body to adjust the total resistance of the branch where the self-limiting temperature heating tape body is located, thereby limiting the current in the branch, avoiding excessive current caused by the low resistance of the self-limiting temperature heating tape body in a low temperature environment, and improving the safety of the self-limiting temperature heating tape.

[0126] It should be noted that the first acquisition module in this embodiment can be used to execute step S10 in the embodiment of the present application, the first determination module in this embodiment can be used to execute step S20 in the embodiment of the present application, and the first setting module in this embodiment can be used to execute step S30 in the embodiment of the present application.

[0127] Furthermore, the variable resistance module includes a variable resistor unit, wherein:

[0128] The control end of the variable resistor unit is connected to the first output end of the temperature detection module, and the variable resistor unit is connected in series with the self-limiting temperature heating belt body.

[0129] Furthermore, the heating tape control system further comprises a bypass module; the bypass module comprises a relay; wherein:

[0130] The coil of the relay is connected to the output end of the temperature detection module; and a group of normally open contacts of the relay is connected in parallel with the variable resistance module.

[0131] Furthermore, the temperature detection module includes a temperature sensor and a controller; wherein:

[0132] The temperature sensor is arranged in contact with the self-limiting temperature heating belt body, the output end of the temperature sensor is connected to the input end of the controller, and the output end of the controller serves as the output end of the temperature detection module.

[0133] Furthermore, the first determining module includes:

[0134] A first determining unit is configured to determine a body resistance value corresponding to the detected temperature, wherein the body resistance value is the resistance value of the self-limiting temperature heating belt corresponding to the detected temperature;

[0135] The second determining unit is configured to determine the target compensation resistance corresponding to the body resistance, wherein the sum of the target compensation resistance and the body resistance is greater than or equal to a minimum resistance threshold.

[0136] Furthermore, the second determining unit includes:

[0137] A first acquiring subunit, configured to acquire the minimum resistance threshold;

[0138] The first calculation subunit is configured to obtain a difference between the minimum resistance threshold and the body resistance as the target compensation resistance.

[0139] Furthermore, the first determining module includes:

[0140] A first judgment unit is used to judge whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance value corresponding to the self-limiting temperature heating belt body is a minimum resistance threshold;

[0141] The third determining unit is configured to determine a target compensation resistance value corresponding to the detected temperature if the detected temperature is less than the preset temperature threshold.

[0142] Furthermore, the third determining unit includes:

[0143] A first judgment subunit is configured to judge whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature at which the resistance corresponding to the self-limiting temperature heating belt body reaches a minimum resistance threshold;

[0144] The first control subunit is configured to control the bypass module to bypass the variable resistance module if the detected temperature is greater than or equal to a preset temperature threshold.

[0145] The present invention also provides a self-limiting temperature heating belt, which includes a self-limiting temperature heating belt body and the heating belt control system described above.

[0146] Reference Figure 4 In terms of hardware structure, the temperature detection module may include components such as a communication module 10, a memory 20, and a processor 30. In the temperature detection module, the processor 30 is connected to the memory 20 and the communication module 10, respectively. The memory 20 stores a computer program, which is simultaneously executed by the processor 30. When the computer program is executed, the steps of the above-mentioned method embodiment are implemented.

[0147] The communication module 10 can be connected to an external communication device via a network. The communication module 10 can receive requests from the external communication device and can also send requests, instructions and information to the external communication device. The external communication device can be another temperature detection module, a server or an IoT device, such as a TV.

[0148] Memory 20 can be used to store software programs and various data. Memory 20 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as obtaining the detected temperature corresponding to the self-limiting temperature heating cable body). The data storage area may include a database and may store data or information generated based on system usage. Memory 20 may also include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0149] The processor 30 is the control center of the temperature detection module. It connects the various components of the entire temperature detection module using various interfaces and circuits. By running or executing software programs and / or modules stored in the memory 20 and accessing data stored in the memory 20, it performs various functions of the temperature detection module and processes data, thereby providing overall monitoring of the temperature detection module. The processor 30 may include one or more processing units; optionally, the processor 30 may integrate an application processor and a modem processor. The application processor primarily handles the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into the processor 30.

[0150] although Figure 4 Although not shown, the temperature detection module may further include a circuit control module, which is used to connect to the power supply to ensure the normal operation of other components. Figure 4 The temperature detection module structure shown in the figure does not constitute a limitation on the temperature detection module, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0151] The present invention also provides a computer-readable storage medium on which a computer program is stored. The computer-readable storage medium may be Figure 4 The memory 20 in the temperature detection module may also be at least one of a ROM (Read-Only Memory) / RAM (Random Access Memory), a magnetic disk, and an optical disk. The computer-readable storage medium includes a number of instructions for enabling a terminal device with a processor (which may be a television, a car, a mobile phone, a computer, a server, a terminal, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0152] In the present invention, the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0153] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0154] Although the embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Persons skilled in the art may make changes, modifications, and substitutions to the above embodiments within the scope of the present invention, and such changes, modifications, and substitutions should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A heating tape control method, characterized in that: The heating tape control method comprises: Get the detection temperature corresponding to the self-limiting temperature heating tape body; determining a target compensation resistance value corresponding to the detected temperature; The resistance value of the variable resistor module is set to the target compensation resistance value so that the current value of the branch where the self-limiting temperature heating belt body is located is less than a preset current threshold.

2. The heating tape control method according to claim 1, wherein: Determining the target compensation resistance corresponding to the detected temperature includes: Determining a body resistance value corresponding to the detected temperature, wherein the body resistance value is the resistance value of the self-limiting temperature heating belt corresponding to the detected temperature; The target compensation resistance corresponding to the body resistance is determined, wherein a sum of the target compensation resistance and the body resistance is greater than or equal to a minimum resistance threshold.

3. The heating tape control method according to claim 2, wherein: Determining the target compensation resistance corresponding to the body resistance includes: Obtaining the minimum resistance threshold; The difference between the minimum resistance threshold and the body resistance is used as the target compensation resistance.

4. The heating tape control method according to claim 1, wherein: Determining the target compensation resistance corresponding to the detected temperature includes: Determine whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance value corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold; If the detected temperature is lower than the preset temperature threshold, a target compensation resistance value corresponding to the detected temperature is determined.

5. The heating tape control method according to claim 4, wherein: The step of determining the target compensation resistance corresponding to the detected temperature includes: Determine whether the detected temperature is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is the temperature when the resistance value corresponding to the self-limiting temperature heating belt body is the minimum resistance threshold; If the detected temperature is greater than or equal to a preset temperature threshold, the bypass module is controlled to bypass the variable resistance module.

6. A heating tape control system, characterized in that: Applied to the heating tape control method according to any one of claims 1 to 5, the heating tape control system is connected to the self-limiting temperature heating tape body, and the heating tape control system includes a temperature detection module and a variable resistance module; the temperature detection end of the temperature detection module is correspondingly arranged to the self-limiting temperature heating tape body, the first output end of the temperature detection module is connected to the control end of the variable resistance module, and the variable resistance module is connected in series with the self-limiting temperature heating tape body.

7. The heating tape control system according to claim 6, wherein: The variable resistor module includes a variable resistor unit, and the variable resistor unit includes a sliding variable resistor and a driving motor; wherein: The sliding rheostat is connected in series with the self-limiting temperature heating belt body; the sliding end of the sliding rheostat is connected to the driving motor, and the control end of the driving motor serves as the control end of the rheostat unit.

8. The heating tape control system according to claim 6, wherein: The heating cable control system further includes a bypass module; the bypass module includes a relay; wherein: The coil of the relay is connected to the output end of the temperature detection module; and a group of normally open contacts of the relay is connected in parallel with the variable resistance module.

9. The heating tape control system according to claim 6, wherein: The temperature detection module includes a temperature sensor and a controller; wherein: The temperature sensor is arranged in contact with the self-limiting temperature heating belt body, the output end of the temperature sensor is connected to the input end of the controller, and the output end of the controller serves as the output end of the temperature detection module.

10. A self-limiting temperature heating tape, characterized in that: The self-limiting temperature heating belt comprises a self-limiting temperature heating belt body and a heating belt control system according to any one of claims 6 to 9.

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