Power supply redundancy switching device for coal mill proportional overflow valve

Abstract

The utility model relates to thermal power generation technical field, it is a kind of coal mill proportion overflow valve power supply redundancy switching device, it includes two-way power input module, intelligent switching control module and output protection module;Two-way power input module's input end connects two-way direct current power supply, and the output end of two-way power input module is connected with the input end of intelligent switching control module, and the output end of intelligent switching control module is connected with the input end of output protection module, and the output end of output protection module is connected with the load of proportion overflow valve.This utility model has realized the seamless switching of coal mill proportion overflow valve dual power supply redundancy, improves power supply reliability, reduces shutdown risk.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology and is a power redundancy switching device for the proportional overflow valve of a coal mill. Background Technology

[0002] In industrial sectors such as thermal power generation, coal mills are crucial material grinding equipment, and their operational stability directly impacts production efficiency and safety. Currently, in the high-pressure oil station control cabinet of coal mills, the proportional relief valve, a key component controlling the loading oil pressure, is powered by a single 24VDC power supply. With prolonged operation, the electronic components of the power module are prone to aging. In the event of undervoltage or power failure, the loading oil pressure of the coal mill will rapidly drop to zero, leading to a tripping of the mill. This not only causes abnormal oil pressure but also results in the grinding rollers dropping instantaneously, severely impacting the internal structure of the coal mill and posing a significant threat to its operational safety.

[0003] Currently, existing technologies for powering proportional relief valves lack a power redundancy scheme capable of seamless switching. When the main power supply fails, it cannot quickly and stably switch to the backup power supply, causing the proportional relief valve to lose power and the coal mill to shut down. This power supply method suffers from insufficient system reliability; frequent downtime not only increases equipment maintenance costs but also seriously affects the continuity and stability of production, hindering the efficient operation of related industrial processes.

[0004] Therefore, there is an urgent need to develop a highly reliable power redundancy switching device for the proportional overflow valve of the coal mill to ensure the safe and stable operation of the coal mill. Utility Model Content

[0005] This invention provides a power redundancy switching device for the proportional overflow valve of a coal mill, which overcomes the shortcomings of the prior art and can effectively solve the problem of poor reliability of single power supply for the proportional overflow valve of a coal mill.

[0006] The technical solution of this utility model is achieved through the following measures: a power redundancy switching device for a proportional overflow valve of a coal mill, characterized in that it includes a dual-power input module, an intelligent switching control module, and an output protection module; the input end of the dual-power input module is connected to two DC power supplies, the output end of the dual-power input module is connected to the input end of the intelligent switching control module, the output end of the intelligent switching control module is connected to the input end of the output protection module, and the output end of the output protection module is connected to the proportional overflow valve load.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The aforementioned dual-power input module may be equipped with a first power input interface and a second power input interface, which are respectively connected to two DC power supplies.

[0009] The aforementioned intelligent switching control module may include a voltage comparator main control chip, a diode isolation circuit, and a MOSFET switching circuit; the voltage comparator is connected to the output terminal of the dual power input module, the input terminal of the diode isolation circuit is connected to the output terminal of the dual power input module, the input terminal of the MOSFET switching circuit is connected to the output terminal of the diode isolation circuit, and the output terminal of the MOSFET switching circuit is connected to the input terminal of the output protection module.

[0010] The aforementioned output protection module may include an overvoltage protection TVS diode, with one end of the overvoltage protection TVS diode connected to the power output terminal and the other end grounded.

[0011] The aforementioned intelligent switching control module may also be equipped with an alarm output, which is connected to the voltage comparator main control chip.

[0012] The aforementioned intelligent switching control module may also be equipped with a power normal indicator component, which is connected to the voltage comparator main control chip.

[0013] This invention achieves high reliability, stability, and safety in power supply to the proportional overflow valve of a coal mill through dual-power redundant switching and multi-level protection design. The dual-power input module and intelligent switching control module work together to achieve millisecond-level power switching, preventing the proportional overflow valve from malfunctioning due to power interruption and reducing the risk of unplanned coal mill downtime. The dual-power physical isolation design, wide voltage input range, and interface protection structure enable the device to adapt to the harsh working environment of the coal mill, characterized by high temperature, high dust, and strong vibration, reducing failures caused by environmental factors. The three-level protection architecture—diode isolation, low-loss MOSFET switching, and TVS overvoltage protection—effectively suppresses surges, voltage fluctuations, and other interference, extending the service life of the proportional overflow valve coil. Compared to traditional relay switching schemes, the MOSFET switching circuit reduces power consumption by more than 90%, significantly reducing energy loss and meeting industrial energy-saving design requirements. The modular design supports seamless integration with existing coal mill control systems, upgrading power supply reliability without major modifications and reducing enterprise technical transformation costs. Through systematic redundancy design and intelligent protection, the operational stability of power generation equipment is significantly improved, creating significant economic benefits and safety production value. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the circuit principle of an embodiment of the present utility model.

[0015] Appendix Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] The codes in the attached diagram are as follows: Vin1 is the first DC power input interface of the dual power input module, Vin2 is the second DC power input interface of the dual power input module, Alarm1 is the alarm output related to the first power supply in the intelligent switching control module, Alarm2 is the alarm output related to the second power supply in the intelligent switching control module, DC OK is the power normal indicator component in the intelligent switching control module, FG is the functional ground in the output protection module, P1 is the first power supply in the dual power input module, P2 is the second power supply in the dual power input module, Vout is the power output terminal of the output protection module, and Load is the proportional relief valve load. Detailed Implementation

[0017] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0018] The present invention will be further described below with reference to embodiments:

[0019] Example 1: As shown in the attached document Figure 1 , 2 As shown, the power redundancy switching device for the proportional overflow valve of the coal mill includes a dual-power input module, an intelligent switching control module, and an output protection module. The input terminals of the dual-power input module are connected to two DC power supplies. The output terminal of the dual-power input module is connected to the input terminal of the intelligent switching control module, and the output terminal of the intelligent switching control module is connected to the input terminal of the output protection module. The output terminal of the output protection module is connected to the proportional overflow valve load. The dual-power input module uses a physical isolation design to simultaneously connect to two independent DC power supplies, ensuring that even if one power supply fails, the other can still provide independent power. The intelligent switching control module continuously monitors key parameters such as voltage and current of the two power supplies. When an anomaly is detected in the main power supply (such as a voltage drop or interruption), it quickly activates the switching mechanism to switch the load power supply to the backup power supply. The output protection module stabilizes and filters the final output power supply, eliminating voltage fluctuations and surges that may occur during power switching, providing stable and clean power to the proportional overflow valve. Through the dual-power redundancy design, the risk of power loss in the proportional overflow valve due to a single power supply failure is completely eliminated, greatly improving the continuity and stability of the coal mill operation. The voltage regulation and filtering function of the output protection module can effectively extend the service life of equipment such as proportional relief valves, reduce equipment failures caused by power supply problems, and reduce maintenance costs and unplanned downtime.

[0020] In this invention, the dual-power input module has a first power input interface and a second power input interface, which are respectively connected to two DC power supplies. The two independent power input interfaces employ a special reverse polarity protection structure with integrated protection circuitry to prevent damage to the device when the power supply polarity is reversed. Electrical isolation is achieved between the interfaces through independent circuit board wiring and isolation measures, preventing interference or mutual influence between the two power supplies. Each interface has a wide voltage range adaptability, compatible with different types of DC power inputs. The reverse polarity protection and electrical isolation design significantly improves the adaptability and safety of the device in complex power supply environments, effectively preventing equipment damage caused by human wiring errors or power supply abnormalities. The wide voltage adaptability ensures that the device can adapt to various power supply configurations, enhancing the flexibility and versatility of applications.

[0021] In this invention, the intelligent switching control module includes a voltage comparator main control chip, a diode isolation circuit, and a MOSFET switching circuit. The voltage comparator is connected to the output of the dual-power input module, the input of the diode isolation circuit is connected to the output of the dual-power input module, the input of the MOSFET switching circuit is connected to the output of the diode isolation circuit, and the output of the MOSFET switching circuit is connected to the input of the output protection module. The voltage comparator continuously compares and analyzes the real-time parameters of the two power supplies. Once it detects that the parameter of one power supply deviates from the normal range, it immediately outputs a trigger signal. The diode isolation circuit utilizes the unidirectional conduction characteristic of diodes to prevent current backflow during the switching process, ensuring the safety and stability of power switching. After receiving the trigger signal, the MOSFET switching circuit acts quickly to achieve contactless power switching. Compared with traditional mechanical switches, the switching speed is faster and there is no mechanical wear. The high-precision voltage comparator enables accurate monitoring of the power supply status and can react instantly to power abnormalities. The diode isolation and MOSFET contactless switching technologies not only improve the speed and reliability of power switching but also reduce energy loss and mechanical failure risks during the switching process, making the entire switching process more stable and efficient.

[0022] In this invention, the output protection module includes an overvoltage protection TVS diode, one end of which is connected to the power output terminal, and the other end is grounded. The overvoltage protection TVS diode is connected in parallel with the power output terminal and is normally in a high-impedance state, not affecting the power output. When the output voltage suddenly rises above a set threshold due to surges, power switching impacts, or other reasons, the TVS diode quickly changes from a high-impedance state to a low-impedance state, rapidly discharging the large current generated by the overvoltage to ground, thus clamping the output voltage within a safe range. Simultaneously, the output protection module may also include other filtering and voltage-regulating components to further optimize the output power quality. The TVS diode's fast response and overvoltage clamping function can effectively resist various abnormal voltage conditions, providing reliable overvoltage protection for sensitive loads such as proportional relief valves. Combined with other filtering and voltage-regulating components, it can significantly reduce output voltage ripple and fluctuations, ensuring the stability of the output power supply and improving the safety and reliability of equipment operation.

[0023] exist Figure 1 The circuit features dual DC power input interfaces, Vin1 and Vin2, allowing connection of two independent DC power supplies for redundant dual-power input. It includes a voltage comparator, diode isolation circuit, and MOSFET switching circuit to monitor the status of both power supplies in real time. When an abnormality (such as undervoltage or power failure) is detected in either Vin1 or Vin2, the MOSFET switching circuit is quickly activated to switch the load power supply to the normal power source. Alarm1 and Alarm2 correspond to the alarm outputs of the two power supplies, issuing an alarm when the corresponding power supply malfunctions. DC OK is a power supply status indicator, displaying whether the power supply is operating normally. FG (functional ground) provides a signal reference, anti-interference, and safety protection functions, ensuring output stability and safety. Figure 2 In this circuit, two power supplies input electrical energy to provide redundant power protection for the load. The power supplies connected to Vin1 and Vin2 are monitored and controlled. Through internal circuit mechanisms, the circuit ensures a rapid switch to the other power supply in the event of a failure in one power supply, maintaining a stable output at Vout. The switched and processed electrical energy is then output from Vout to power the Load (proportional relief valve load), ensuring its normal operation.

[0024] This invention adds a dual-channel 24V redundant power supply module to the control cabinet, employing diode isolation and MOSFET switching circuitry to achieve millisecond-level fault switching, and integrating power status indicator lights and fault alarm output contacts. This invention enables automatic switching within 0ms-50ms in the event of a power failure, avoiding voltage fluctuations and delayed power loss caused by traditional relay switching. Its modular design allows for direct integration into existing control cabinets, reducing the rate of non-stop accidents in the coal mill caused by abnormal oil pressure.

[0025] Example 2: As shown in the attached document Figure 1 , 2 As shown, the intelligent switching control module of the coal mill proportional overflow valve power redundancy switching device also has an alarm output, which is connected to the voltage comparator main control chip. When the voltage comparator detects an abnormality in the power supply (such as voltage abnormality, power interruption, etc.), in addition to triggering the power switching action, it will also send a signal to the alarm output circuit. After receiving the signal, the alarm output circuit transmits the alarm signal to external devices, such as audible and visual alarms, monitoring systems, etc., through relay contact output or digital signal output, and issues an alarm to the operator in different forms (sound, flashing lights, system alarm prompts, etc.). The real-time alarm function enables the operator to obtain power abnormality information at the first time, take timely measures to troubleshoot and handle the fault, shorten the fault response time, avoid equipment damage or the escalation of production accidents caused by the failure to detect faults in time, and improve the safety and operation and maintenance efficiency of the entire system.

[0026] Example 3: As shown in the attached document Figure 1 , 2 As shown, the intelligent switching control module of the coal mill proportional overflow valve power redundancy switching device also includes a power normal indicator component, which is connected to the voltage comparator main control chip. The power normal indicator component consists of indicator lights or a display screen, and is connected to the voltage comparator main control chip. The voltage comparator continuously monitors the status of the two power supplies. When both power supplies are detected to be within the normal operating range, it sends a signal to the power normal indicator component, causing it to display in a specific manner (e.g., a solid green light, a normal indicator on the display screen). If either power supply malfunctions, the display status changes (e.g., the light changes color, flashes, or an abnormality message appears on the display screen). This intuitive power status display function allows operators to quickly understand the power supply operation without the need for specialized equipment, greatly facilitating daily inspections and equipment maintenance. Timely abnormal status display helps operators quickly locate faults, improves troubleshooting efficiency, and ensures the stable operation of the coal mill system.

[0027] The above technical features constitute the embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A power redundancy switching device for a proportional overflow valve in a coal mill, characterized in that... It includes a dual-power input module, an intelligent switching control module, and an output protection module; the input terminal of the dual-power input module is connected to two DC power supplies, the output terminal of the dual-power input module is connected to the input terminal of the intelligent switching control module, the output terminal of the intelligent switching control module is connected to the input terminal of the output protection module, and the output terminal of the output protection module is connected to a proportional relief valve load.

2. A proportioning overflow valve power supply redundancy switching device for a coal mill as claimed in claim 1, characterised in that The dual power input module is equipped with a first power input interface and a second power input interface, which are respectively connected to two DC power supplies.

3. A proportioning overflow valve power supply redundancy switching device for a coal mill as claimed in claim 1 or 2, characterised in that The intelligent switching control module includes a voltage comparator main control chip, a diode isolation circuit, and a MOSFET switching circuit. The voltage comparator is connected to the output of the dual power input module, the input of the diode isolation circuit is connected to the output of the dual power input module, the input of the MOSFET switching circuit is connected to the output of the diode isolation circuit, and the output of the MOSFET switching circuit is connected to the input of the output protection module.

4. A proportioning overflow valve power supply redundancy switching device for a coal mill as claimed in claim 1 or 2, characterised in that The output protection module includes an overvoltage protection TVS diode, with one end of the overvoltage protection TVS diode connected to the power output terminal and the other end grounded.

5. The coal mill proportioner overflow valve power supply redundant switching device according to claim 3, characterized in that The output protection module includes an overvoltage protection TVS diode, with one end of the overvoltage protection TVS diode connected to the power output terminal and the other end grounded.

6. A proportioning overflow valve power supply redundant switching device for a coal pulverizer as recited in claim 1 or 2 or 5 wherein The intelligent switching control module also has an alarm output, which is connected to the voltage comparator main control chip.

7. The coal mill proportioner overflow valve power supply redundant switching device according to claim 3, characterized in that The intelligent switching control module also has an alarm output, which is connected to the voltage comparator main control chip.

8. The coal mill proportional overflow valve power redundancy switching device according to claim 4, characterized in that... The intelligent switching control module also has an alarm output, which is connected to the voltage comparator main control chip.

9. A proportioning overflow valve power supply redundant switching device for a coal pulverizer as defined in claim 1 or 2 or 5 or 7 or 8, characterized in that The intelligent switching control module also includes a power normal indicator, which is connected to the voltage comparator main control chip.

10. The coal mill proportioner overflow valve power supply redundant switching device according to claim 3, characterized in that The intelligent switching control module also includes a power normal indicator, which is connected to the voltage comparator main control chip.

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