A self-adaptive temperature control power re-distribution snow-melting front-end control module

Abstract

The application relates to a self-adaptive temperature control power redistribution snow melting front end control module for a turnout snow melting system, which is characterized by comprising a CPU processing module, a control module, a voltage acquisition module, a current acquisition module, a protection module, a power supply processing module, a heating strip temperature acquisition module, a pre-warning processing module and corresponding interfaces; the CPU processing module is connected with the control module, which is used for controlling on-off to open or close power supply connected to each heating strip; the voltage acquisition module connected with the CPU processing module is used for acquiring the voltage of a transformer primary coil interface and a secondary coil interface; the current acquisition module connected with the CPU processing module is used for acquiring the working current of each heating strip; through real-time monitoring and intelligent algorithms, the application automatically selects the optimal heating strategy, safely drives the over-configured heating load under the premise of not increasing the capacity of an isolation transformer, maximally utilizes the existing equipment and reduces the system upgrading cost.

Description

Technical Field

[0001] This invention relates to the field of snow melting technology for railway turnouts, and in particular to a snow melting front-end control module with adaptive temperature control and power redistribution for a turnout snow melting system. Background Technology

[0002] The turnout snow melting system is a key piece of equipment for ensuring railway transportation safety, especially winter traffic safety. For example... Figure 1 As shown, the existing minimum snow melting system for turnouts typically consists of an isolation transformer and multiple heating bars. AC 380V mains power is connected to the primary winding of the isolation transformer, and the secondary winding outputs AC 220V to directly power each heating bar.

[0003] In this system, the rated power of the isolation transformer is fixed. The system functions normally when the sum of the power of all heating elements is less than or equal to the power of the isolation transformer. However, with increasing demands for snow melting efficiency, higher-power heating elements or an increased number of heating elements are required. Once the total power of the heating elements exceeds the rated power of the isolation transformer, the system will malfunction, for example, it will be unable to activate all heating elements simultaneously. Existing solutions typically involve replacing the isolation transformer with a larger capacity one or adding additional power modules, but both solutions suffer from high costs, extensive retrofitting, increased system complexity, and increased risk of failure.

[0004] Therefore, how to safely and efficiently drive a heating load with a higher total power using the existing isolation transformer without significantly increasing costs and the difficulty of modification is a technical challenge currently facing the turnout snow melting system. Summary of the Invention

[0005] The present invention aims to solve the technical problem that the existing turnout snow melting system cannot meet the demand for higher power snow melting due to the limited power of the isolation transformer.

[0006] To achieve the above objectives, the present invention provides a snow melting front-end control module with adaptive temperature control and power redistribution, comprising: a CPU processing module; a control module connected to the CPU processing module for controlling the on / off state to turn on or off the power supply connected to each heating strip; a voltage acquisition module connected to the CPU processing module for acquiring the voltage of the primary coil interface and the secondary coil interface of the transformer; a current acquisition module connected to the CPU processing module for acquiring the operating current of each heating strip; and a heating strip temperature acquisition module connected to the CPU processing module for acquiring the temperature of each heating strip; the CPU processing module is configured to: The power of each heating bar is calculated based on the voltage and current collected by the voltage acquisition module and the current acquisition module. Based on the comparison results of the total power of all heating bars and the rated power of the isolation transformer, as well as the comparison results of the power of a single heating bar and the rated power of the isolation transformer, the system adaptively selects the heating mode of all heating, time-sharing heating, or special heating, and controls the control module to execute the selected heating mode. When the temperature difference between the heating bars exceeds the preset threshold based on the temperature collected by the heating bar temperature acquisition module, the system automatically performs power redistribution to extend the power supply time of the heating bar or heating bar group with the lowest temperature.

[0007] Furthermore, the CPU processing module is configured to: when the sum of the power of all heating bars is less than the rated power of the isolation transformer, select the all heating mode and control all heating bars to turn on and off simultaneously.

[0008] Furthermore, the CPU processing module is configured to: when the power of any single heating bar is less than the rated power of the isolation transformer, and the sum of the power of any two heating bars is greater than the rated power of the isolation transformer, select the time-sharing heating mode, control that only one heating bar is powered at a time, and make the power supply duration of each heating bar equal, and repeat in a loop.

[0009] Furthermore, the CPU processing module is configured to: when the power of all single heating bars is less than the rated power of the isolation transformer, but the conditions for full heating and time-sharing heating are not met, select the special heating mode, divide the heating bars into at least two groups, one of which contains at least two heating bars, ensure that the total power of each group is less than the rated power of the isolation transformer, then perform time-sharing heating on each group, and make the power supply duration of each group equal, and repeat the cycle.

[0010] Furthermore, the power redistribution specifically includes: when the difference between the highest and lowest temperatures in the heating bars reaches or exceeds 10 degrees Celsius, doubling the power supply time of the heating bar or heating bar group with the lowest current temperature, and continuing to operate in the extended power supply mode for at least 30 minutes.

[0011] The technical solution of this invention has the following beneficial effects: Through real-time monitoring and intelligent algorithms, this invention automatically selects the optimal heating strategy (all, time-sharing, special), safely driving the over-supplied heating load without increasing the capacity of the isolation transformer, maximizing the utilization of existing equipment and significantly reducing system upgrade costs. By monitoring the temperature of each heating strip and dynamically adjusting the power supply time in low-temperature areas, it achieves balanced heat distribution, avoiding localized overheating or incomplete snow melting, thus improving snow melting efficiency and system energy efficiency. The integrated voltage and current monitoring and early warning processing module can promptly detect and warn of abnormal conditions such as short circuits, open circuits, overloads, and insufficient transformer capacity. Combined with the protection module, this significantly improves the reliability and safety of the system. The module can be easily installed in existing isolation transformers, suitable for both new lines and the upgrading of existing lines, and is convenient for installation and maintenance. Compared to replacing transformers or adding power modules, this invention provides a cost-effective solution with enormous market application potential.

[0012] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a block diagram of the minimum system for snow melting of existing railway turnouts.

[0014] Figure 2 This is a block diagram of the improved turnout snow melting minimum system, which includes the snow melting front-end control module of this invention.

[0015] Figure 3 This is a block diagram of the snow melting front-end control module of the present invention.

[0016] Figure 4 This is a flowchart of the power allocation process for the snow melting front-end control module of the present invention.

[0017] Figure 5 This is a timing diagram of all heating modes of the present invention.

[0018] Figure 6 This is a timing diagram of the time-sharing heating mode of the present invention.

[0019] Figure 7 This is a timing diagram of the special heating mode of the present invention.

[0020] Figure 8 This is a flowchart of the temperature redistribution process of the snow melting front-end control module of the present invention.

[0021] Figure 9 This is a timing diagram of temperature redistribution under the special heating mode of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. Example 1

[0023] like Figure 2 , Figure 3 As shown, this invention relates to a snow melting front-end control module with adaptive temperature control and power redistribution. This module is installed inside an isolation transformer and includes: a CPU processing module, a control module, a voltage acquisition module, a current acquisition module, a protection module, a power supply processing module, a heating strip temperature acquisition module, an early warning processing module, and corresponding interfaces (transformer primary / secondary coil interface, heating strip output, and temperature acquisition interface). The CPU processing module is the core of the entire module, responsible for executing the power distribution and temperature redistribution algorithms, and interacting with the control module, voltage acquisition module, current acquisition module, protection module, power supply processing module, and heating strip temperature acquisition module. The system includes a temperature acquisition module, an early warning processing module, and corresponding interface interactions. The control module is controlled by the DC 3.3V signal from the CPU processing module, acting as a switch to connect or disconnect the AC 220V power supply to each heating strip, enabling precise control of the heating time. The voltage acquisition module and current acquisition module collect the output voltage U of the transformer secondary coil and the operating current I of each heating strip in real time, and transmit the data to the CPU. The CPU calculates the actual power P=U*I of each heating strip based on this data. The heating strip temperature acquisition module collects the temperature of each heating strip in real time through a temperature sensor (such as a thermocouple) and transmits it to the CPU.

[0024] The control module connected to the CPU processing module controls the power supply to each heating bar to be turned on or off. The CPU processing module is connected to a voltage acquisition module for acquiring the voltage of the primary coil interface and the secondary coil interface of the transformer; the CPU processing module is connected to a current acquisition module for acquiring the operating current of each heating strip; the CPU processing module is connected to a heating strip temperature acquisition module for acquiring the temperature of each heating strip; the CPU processing module is configured to calculate the power of each heating strip based on the voltage and current acquired by the voltage acquisition module and the current acquisition module. Based on the comparison results of the total power of all heating bars and the rated power of the isolation transformer, as well as the comparison results of the power of a single heating bar and the rated power of the isolation transformer, the system adaptively selects the full heating, time-sharing heating, or special heating mode, and controls the control module to execute the selected heating mode. When the temperature difference between heating bars exceeds a preset threshold based on the temperature collected by the heating bar temperature acquisition module, power redistribution is automatically performed to extend the power supply time of the heating bar or heating bar group with the lowest temperature.

[0025] like Figure 4 As shown: Assume there are three sets of heating bars A, B, and C, with power ratings P_A, P_B, and P_C respectively, and the isolation transformer has a rated power of P_H. The CPU makes adaptive decisions based on the following logic: All heating modes are selected if P_A + P_B + P_C ≤ P_H. The CPU controls the control modules corresponding to all heating bars to simultaneously turn on and off. The timing diagram is as follows: Figure 5 As shown.

[0026] If condition 1 is not met in the time-sharing heating mode, but P_A < P_H, P_B < P_H, P_C < P_H, and the sum of the power of any two > P_H (e.g., P_A + P_B > P_H), then this mode is selected. The CPU controls only one heating bar to be activated at a time, cycling in the order A->B->C->A..., with each bar having the same heating time (e.g., the program is set to 5 cycles, totaling 100ms). Its timing diagram is as follows... Figure 6 As shown.

[0027] In special heating modes, if conditions 1 and 2 are not met, but P_A < P_H, P_B < P_H, and P_C < P_H, the system will group the heating bars. For example, heating bar A is grouped into one group, and heating bars B and C are grouped into another group, ensuring that P_A < P_H and P_B + P_C < P_H. The CPU controls these two groups to perform time-sharing heating, with each group having the same heating time, repeating cyclically. The timing diagram is as follows. Figure 7 As shown.

[0028] If the power of any single heating bar, P_x, is greater than or equal to P_H, the CPU determines that the transformer capacity is insufficient and issues an alarm through the early warning processing module.

[0029] like Figure 8 As shown, during the execution of any heating mode, the CPU continuously monitors the temperature of each heating bar. If the difference between the highest temperature T_max and the lowest temperature T_min is detected to be ΔT = T_max - T_min ≥ 10℃, power redistribution is triggered. Specifically, the power supply time of the heating bar with the lowest current temperature (or the group containing that heating bar) is doubled. For example, in a special heating mode, if the temperature of bar B in group B and C is found to be lower, then the following is executed: Figure 9 The timing shown extends the heating time of groups B and C from the original duration T to 2T. This adjusted mode will run for at least 30 minutes, after which the CPU will reassess the temperature difference and decide whether to restore or continue the adjustment, which ensures the uniformity of temperature in the snow melting area.

[0030] The voltage acquisition module continuously monitors the input voltage to ensure normal system operation. The current acquisition module monitors sudden current changes. If a short circuit or open circuit occurs, the early warning processing module issues an alarm. The protection module (such as a varistor) is connected in parallel across the thyristor of the control module to absorb surge and lightning energy. Example 2

[0031] This embodiment provides a turnout snow melting system, including an isolation transformer, multiple heating bars, and a snow melting front-end control module as described in Embodiment 1. The control module is installed inside the isolation transformer housing. Its input terminal (transformer secondary coil interface) is connected to the secondary winding of the isolation transformer, and its output terminal (heating bar output) is connected to each heating bar. This system can stably drive a group of heating bars with a total power exceeding the rated power of the isolation transformer and achieve efficient and balanced snow melting operations.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various improvements and modifications without departing from the overall concept of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A snow melting front-end control module with adaptive temperature control and power redistribution, characterized in that, include: The system includes a CPU processing module, a control module, a voltage acquisition module, a current acquisition module, a protection module, a power supply processing module, a heating bar temperature acquisition module, an early warning processing module, and corresponding interfaces. The CPU processing module is connected to a control module, which is used to control the on / off state to turn on or off the power supply connected to each heating bar. A voltage acquisition module connected to the CPU processing module is used to acquire the voltage of the primary coil interface and the secondary coil interface of the transformer; a current acquisition module connected to the CPU processing module is used to acquire the operating current of each heating strip; a heating strip temperature acquisition module connected to the CPU processing module is used to acquire the temperature of each heating strip; the CPU processing module is configured to calculate the power of each heating strip based on the voltage and current acquired by the voltage acquisition module and the current acquisition module. Based on the comparison results of the total power of all heating bars and the rated power of the isolation transformer, as well as the comparison results of the power of a single heating bar and the rated power of the isolation transformer, the system adaptively selects the full heating, time-sharing heating, or special heating mode, and controls the control module to execute the selected heating mode. When the temperature difference between heating bars exceeds a preset threshold based on the temperature collected by the heating bar temperature acquisition module, power redistribution is automatically performed to extend the power supply time of the heating bar or heating bar group with the lowest temperature.

2. The snow melting front-end control module with adaptive temperature control and power redistribution as described in claim 1, characterized in that, The CPU processing module is further configured as follows: When the sum of the power of all heating bars is less than the rated power of the isolation transformer, select the all heating mode to control all heating bars to turn on and off simultaneously.

3. The snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, The CPU processing module is further configured as follows: When the power of any single heating bar is less than the rated power of the isolation transformer, and the sum of the power of any two heating bars is greater than the rated power of the isolation transformer, the time-sharing heating mode is selected to control the power supply to only one heating bar at a time, and to make the power supply duration of each heating bar equal, and repeats in a cycle.

4. A snow melting front-end control module with adaptive temperature control and power redistribution as described in claim 1, characterized in that, The CPU processing module is further configured as follows: When the power of all single heating bars is less than the rated power of the isolation transformer, but the conditions for full heating and time-sharing heating are not met, the special heating mode is selected, the heating bars are divided into at least two groups, one of which contains at least two heating bars, ensuring that the total power of each group is less than the rated power of the isolation transformer, and then each group is heated in time-sharing mode, and the power supply duration of each group is equal, and the cycle is repeated.

5. A snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, The CPU processing module is further configured as follows: When the power of any single heating bar is detected to be greater than the rated power of the isolation transformer, a warning signal of insufficient transformer capacity is issued.

6. A snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, The power redistribution specifically includes: When the difference between the highest and lowest temperatures in the heating bars reaches or exceeds 10 degrees Celsius, the power supply time of the heating bar or heating bar group with the lowest current temperature is doubled, and the power supply mode after the extended time is used to continue operating for at least 30 minutes.

7. A snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, Also includes: A protection module, connected to the control module, is used to prevent lightning strikes and protect the thyristor in the control module. The early warning processing module is connected to the CPU processing module and is used to issue an early warning when the heating strip experiences a short circuit, open circuit, or abnormal current.

8. A snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, The control module uses a low DC 3.3V voltage provided by the CPU processing module to control the switching on and off of a high AC 220V voltage.

9. A snow melting front-end control module with adaptive temperature control and power redistribution according to claim 1, characterized in that, The voltage acquisition module is also used to acquire the voltage frequency of the primary coil interface and the secondary coil interface of the transformer.

10. A turnout snow melting system, characterized in that, It includes an isolation transformer, at least one heating strip, and a snow melting front-end control module as described in claim 1; the snow melting front-end control module is installed inside the isolation transformer, its input end is connected to the secondary coil of the isolation transformer, and its output end is connected to each heating strip.

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