Transformer temperature controller

Abstract

The utility model discloses a transformer temperature controller, which is arranged in a box-type transformer and comprises a CPU (central processing unit), a key module, an LED (light-emitting diode) indicating lamp module, a 5G communication module, a switching value input module, a relay output module, a direct current acquisition module, an AC-DC (alternating current-direct current) power supply module and a 12864 liquid crystal display module, wherein the CPU processing unit is connected with the key module, the LED indicating lamp module, the 5G communication module, the switching value input module, the relay output module, the direct current acquisition module, the AC-DC power supply module and the 12864 liquid crystal display module, and the LED indicating lamp module, the switching value input module, the relay output module and the direct current acquisition module are further connected with the AC-DC power supply module.

Description

Technical Field

[0001] The utility model relates to the field of temperature controllers, in particular to a transformer temperature controller. Background Art

[0002] By 2021, onshore wind power will be fully connected to the grid at parity, and wind power will enter the era of parity. Due to the advantages of grid-connected electricity prices, the refined management of existing wind farms becomes even more important. The box transformer is an important equipment for the stable operation of wind farms. However, due to the characteristics of the functions and effects of the old box transformers, the monitoring, maintenance and optimization of the internal environment of the box transformer can only be done through periodic inspections, maintenance and optimization by a large number of manpower, and it is impossible to understand the operating environment parameters of the box transformer in real time. During the operation of the box transformer, different degrees of condensation will occur inside. The water droplets produced by the condensation will drip on the components, terminals, busbars, circuit boards, etc. in the cabinet, causing short circuits, discharges, insulation defects, rust or electrical performance defects, endangering equipment and personal safety, and have not received enough attention.

[0003] Due to the characteristics of the functions and roles of the current old box-type transformers, the monitoring, maintenance and optimization of box-type transformers have not received sufficient attention. The internal operating environment parameters of the box-type transformer equipment often cannot be directly entered into the SCADA system configured in the wind farm. To monitor the internal environmental status of the box-type transformer, complex access modifications are often required, which have high direct and indirect costs. Utility Model Content

[0004] The utility model provides a transformer temperature controller, which is used to solve the technical problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the utility model provides a transformer temperature controller, which is arranged in a box-type transformer, and includes: a CPU processing unit, a button module, an LED indicator module, a 5G communication module, a switch input module, a relay output module, a DC quantity acquisition module, an AC-DC power supply module and a 12864 liquid crystal display module, wherein:

[0006] The CPU processing unit is connected with the button module, LED indicator module, 5G communication module, switch input module, relay output module, DC acquisition module, AC-DC power supply module and 12864 LCD display module.

[0007] The LED indicator module, switch input module, relay output module, and DC quantity acquisition module are further connected to the AC-DC power supply module.

[0008] The AC-DC power supply module is used to convert 220V AC power into DC power. The AC-DC power supply module includes a filter module, an AC-DC power supply module and a DCDC power supply module. The AC-DC power supply module is connected between the filter module and the DCDC power supply module. The filter module is connected to the 220V AC power supply. The AC-DC power supply module outputs 5V DC power and 24V DC power. Among them, the 5V DC power supplies the 5G communication module, and the 24V DC power supplies the relay output module. The 5V DC power is further converted by the DCDC power supply module to obtain 3.3V DC power. The 3.3V DC power supplies the CPU processing unit, the button module, the LED indicator module, the switch input module, the relay output module, the DC acquisition module and the 12864 LCD display module;

[0009] The LED indicator module is connected to the relay output module and the AC-DC power supply module. The LED indicator module includes an eight-bit shift register 74HC595, three red LEDs, a green LED, a current limiting resistor R5, a current limiting resistor R7, a current limiting resistor R8, a current limiting resistor R9, a filter capacitor EC5, a capacitor C10 and a capacitor C40. The three red LEDs and the green LED are used to indicate the following four working states: communication, abnormality, alarm, and tripping. The first end of the filter capacitor EC5 is connected to a 3.3V direct current and is connected to the three red LEDs and the green LED. The second end of the filter capacitor EC5 is grounded. The current limiting resistors R5, R7, R8 and R9 are respectively connected to the Q3-Q6 ends of the eight-bit shift register 74HC595. The VCC end of the eight-bit shift register 74HC595 is connected to the 3.3V direct current, the first end of the capacitor C10 and the first end of the capacitor C40. The second end of the capacitor C10 and the second end of the capacitor C40 are grounded.

[0010] The key module is connected to the DC quantity acquisition module and the AC-DC power supply module. The key module is connected to 3.3V DC. The key module includes 8 mechanical keys, which are directly connected to the microcontroller pins. The input level of the 8 mechanical key pins IO is detected to determine whether the key is pressed. The 8 mechanical keys are used by the user to perform the following operations: up, down, left, right, add, subtract, confirm, and return.

[0011] The 5G communication module includes a 5G communication submodule, a 485 chip and a single-phase inverter. The single-phase inverter is connected between the 5G communication submodule and the 485 chip. The 5G communication module is connected to a 3.3V direct current. The 485 chip has a first communication terminal and a second communication terminal. The first communication terminal communicates with the temperature and humidity sensor and the box-type transformer, and the second communication terminal communicates with the 5G communication submodule.

[0012] The switch quantity input module includes four sub-circuits, each of which collects one switch quantity signal. The sub-circuit includes a 24V DC positive electrode, a first current limiting resistor, a second current limiting resistor, a diode, a voltage divider resistor, an isolation optocoupler, a pull-up resistor and a 24V DC negative electrode. The isolation optocoupler includes an input diode and a phototransistor. The voltage divider resistor protects the input diode of the isolation optocoupler within a safe operating voltage range. The diode limits the reverse voltage of the input diode of the isolation optocoupler within a safe range. The pull-up resistor and the phototransistor of the isolation optocoupler form a voltage divider circuit.

[0013] The relay output module includes two eight-bit shift registers and eight-way relays. The eight-bit shift register has an eight-bit parallel buffer inside. The relay output module automatically controls the eight-way relays.

[0014] The DC flow acquisition module includes three three-wire temperature acquisition circuits and three DC flow acquisition circuits, wherein the temperature sensor in the three-wire temperature acquisition circuit is a PT100 platinum resistor, and the DC flow acquisition circuit is used to collect 4-20mA DC flow signals, and the signals collected by the DC flow acquisition module are input into the CPU processing unit;

[0015] The 12864 LCD display module is connected to the relay output module and the AC-DC power supply module, and adopts the ST7565R drive scanning method.

[0016] In one embodiment of the present invention, the CPU processing unit adopts a high-performance 32-bit CPU, using ARMCortex TM -M0F core, main frequency is 48MHz.

[0017] The transformer temperature controller provided by the utility model measures the temperature of the three-wire winding of the transformer in real time, and controls the fan according to the set start-up control value, and has high-temperature alarm and ultra-high temperature tripping output control of the three-wire winding; the dehumidifier is controlled by the real-time collection of ambient temperature and humidity; the utility model also has four-way binary input, and can be externally connected to a smoke sensor for fire warning, and output a smoke alarm dry contact signal; at the same time, the device adopts an external 5G communication module to upload the internal environmental parameters of the box transformer operation to the remote control console in real time, and the remote control console can realize remote adjustment of important data of the device and remote control of the export; on the basis of box transformer monitoring, predictive maintenance of the box transformer is realized, the operation and maintenance level of the box transformer is improved, the failure rate of the box transformer is reduced, and the power generation performance of the wind farm is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a transformer temperature controller provided by the utility model;

[0020] Figure 2 A circuit diagram of an AC-DC power supply module according to an embodiment of the present invention;

[0021] Figure 3 A circuit diagram of an LED indicator light module according to an embodiment of the present invention;

[0022] Figure 4 A circuit diagram of a key module according to an embodiment of the present invention;

[0023] Figure 5 This is a circuit diagram of a 5G communication module according to an embodiment of the present invention;

[0024] Figure 6 A circuit diagram of a switch input module according to an embodiment of the present invention;

[0025] Figure 7 A circuit diagram of a relay output module according to an embodiment of the present invention;

[0026] Figure 8 A circuit diagram of a DC quantity acquisition module according to an embodiment of the present invention;

[0027] Fig. 9 FIG. 1 is a circuit diagram of a 12864 liquid crystal display module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The Internet of Things technology has made great progress in recent years, and the ways and methods of data collection, data transmission, data storage, data analysis and data application have undergone profound changes. Previously, the internal environmental data of the box-type transformer had to be monitored through the SCADA network of the wind farm. Under the conditions of Internet of Things technology, the internal environmental data of the box-type transformer can be transmitted from the device to the Internet of Things cloud through the Internet of Things gateway, as well as data analysis and data application based on cloud computing.

[0030] The utility model provides a transformer temperature controller. Figure 1 This is a schematic diagram of the structure of the transformer temperature controller provided by the utility model. The transformer temperature controller is arranged in a box-type transformer, which includes: a CPU processing unit, a button module, an LED indicator module, a 5G communication module, a switch input module, a relay output module, a DC quantity acquisition module, an AC-DC power supply module and a 12864 liquid crystal display module, wherein:

[0031] The CPU processing unit is connected with the button module, LED indicator module, 5G communication module, switch input module, relay output module, DC acquisition module, AC-DC power supply module and 12864 LCD display module.

[0032] The LED indicator module, switch input module, relay output module, and DC quantity acquisition module are further connected to the AC-DC power supply module.

[0033] The AC-DC power supply module is used to convert 220V AC power into DC power. The AC-DC power supply module includes a filter module, an AC-DC power supply module and a DCDC power supply module. The AC-DC power supply module is connected between the filter module and the DCDC power supply module. The filter module is connected to the 220V AC power supply. The AC-DC power supply module outputs 5V DC power and 24V DC power. Among them, the 5V DC power supplies the 5G communication module, and the 24V DC power supplies the relay output module. The 5V DC power is further converted by the DCDC power supply module to obtain 3.3V DC power. The 3.3V DC power supplies the CPU processing unit, the button module, the LED indicator module, the switch input module, the relay output module, the DC acquisition module and the 12864 LCD display module;

[0034] Figure 2 FIG. 1 is a circuit diagram of an AC-DC power supply module according to an embodiment of the present invention. Figure 2As shown, the AC-DC power supply module uses an AC 220V power input, P1 is a filter module, P2 is an AC to DC power supply module, U4 is a DCDC power supply module, and the AC-DC power supply module outputs one 5V DC and one 24V DC. The circuit includes a filter element, an overvoltage protection element, and an overcurrent protection element; the fuse F1 plays an overload protection role, and the high-voltage ceramic capacitors C1, C2 and the varistor R1 further stabilize the input voltage of the power supply. The AC 220V input power is converted into input and output voltages through the AC to DC power supply module P2 to obtain two power supplies. 5V DC power is used to power the 5G communication module, and filter capacitor C3 and electrolytic capacitor C4 stabilize the power supply output voltage; 24V DC power is used to power the relay output module, and filter capacitor C5 and electrolytic capacitor C6 stabilize the power supply output voltage; 5V DC power is converted into input and output voltage through DCDC power module U4 to obtain 3.3V voltage to supply power to the CPU processing unit, button module, LED indicator module, switch input module, relay output module, DC quantity acquisition module, and 12864 LCD display module, and filter capacitor C9 and voltage stabilizing capacitor EC2 stabilize the output voltage of the power supply.

[0035] The LED indicator module is connected to the relay output module and the AC-DC power supply module. The LED indicator module includes an eight-bit shift register 74HC595, three red LEDs, a green LED, a current limiting resistor R5, a current limiting resistor R7, a current limiting resistor R8, a current limiting resistor R9, a filter capacitor EC5, a capacitor C10 and a capacitor C40. The three red LEDs and the green LED are used to indicate the following four working states: communication, abnormality, alarm, and tripping. The first end of the filter capacitor EC5 is connected to a 3.3V direct current and is connected to the three red LEDs and the green LED. The second end of the filter capacitor EC5 is grounded. The current limiting resistors R5, R7, R8 and R9 are respectively connected to the Q3-Q6 ends of the eight-bit shift register 74HC595. The VCC end of the eight-bit shift register 74HC595 is connected to the 3.3V direct current, the first end of the capacitor C10 and the first end of the capacitor C40. The second end of the capacitor C10 and the second end of the capacitor C40 are grounded.

[0036] Figure 3 FIG. 1 is a circuit diagram of an LED indicator light module according to an embodiment of the present invention. Figure 3As shown, the LED indicator light module consists of current limiting resistors R5, R7, R8, R9 and filter capacitors EC5, C10, C40, and adopts 74HC595 eight-bit shift register. The single-chip microcomputer uses three IOs to control the four status lights of the device: communication, abnormality, alarm, and tripping. In the figure, "3.3V" means the voltage value is +3.3V, which comes from the 3.3V DC converted from 5V DC by the DCDC power module U4.

[0037] The key module is connected to the DC quantity acquisition module and the AC-DC power supply module. The key module is connected to 3.3V DC. The key module includes 8 mechanical keys, which are directly connected to the microcontroller pins. The input level of the 8 mechanical key pins IO is detected to determine whether the key is pressed. The 8 mechanical keys are used by the user to perform the following operations: up, down, left, right, add, subtract, confirm, and return.

[0038] Figure 4 FIG. 1 is a circuit diagram of a key module according to an embodiment of the present invention. Figure 4 As shown in the figure, the key module circuit is composed of specific resistors, capacitors, and eight mechanical keys, which improves the anti-interference performance of data communication and reduces the false touch rate; and adopts the MCU pin IO direct connection method, eliminating the key driver IC and reducing the cost. Figure 4 KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7, and KEY8 are key signal inputs, which are directly connected to the microcontroller pins. By detecting the input level of the KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7, and KEY8 pin IOs, it is determined whether the key is pressed, thereby realizing the device with 8 keys to control up, down, left, right, plus, minus, confirm, and return, so that users can switch menu interfaces, function options, and data queries, etc. In the figure, "3.3V" means that the voltage value is +3.3V, which comes from the 3.3V DC converted by the DCDC power module U4 from 5V DC.

[0039] The 5G communication module includes a 5G communication submodule, a 485 chip and a single-phase inverter. The single-phase inverter is connected between the 5G communication submodule and the 485 chip. The 5G communication module is connected to a 3.3V direct current. The 485 chip has a first communication terminal and a second communication terminal. The first communication terminal communicates with the temperature and humidity sensor and the box-type transformer, and the second communication terminal communicates with the 5G communication submodule.

[0040] Figure 5 FIG. 5 is a circuit diagram of a 5G communication module according to an embodiment of the present invention. Figure 5As shown, the 5G communication module consists of specific resistors, capacitors and single-phase inverter U3, 485 chip U2 and 5G communication sub-module U1; "3.3V" in the figure indicates that the voltage value is +3.3V, which comes from the 3.3V DC converted by the DCDC power module U4 from 5V DC. All "3.3V" in the figure are the same connection point. The first communication end acts on the temperature and humidity sensor to communicate with the box transformer, and the second communication end acts on the 5G communication sub-module; the transformer temperature controller sends the collected temperature and humidity data to the 5G module through the 485 chip U2, and the 5G module transmits the data to the cloud console in real time for visualization and remote control.

[0041] The switch quantity input module includes four sub-circuits, each of which collects one switch quantity signal. The sub-circuit includes a 24V DC positive electrode, a first current limiting resistor, a second current limiting resistor, a diode, a voltage divider resistor, an isolation optocoupler, a pull-up resistor and a 24V DC negative electrode. The isolation optocoupler includes an input diode and a phototransistor. The voltage divider resistor protects the input diode of the isolation optocoupler within a safe operating voltage range. The diode limits the reverse voltage of the input diode of the isolation optocoupler within a safe range. The pull-up resistor and the phototransistor of the isolation optocoupler form a voltage divider circuit.

[0042] Figure 6 FIG. 1 is a circuit diagram of a switch input module according to an embodiment of the present invention. Figure 6 As shown, the binary input circuit can collect 4 switch quantity signals at the same time. Take DI2 as an example: the circuit of DI2 includes 24V DC positive pole, R24, R28 current limiting resistors, R26 voltage divider resistor, U14 isolation optocoupler, and 24V DC negative pole; the role of voltage divider resistor R26 is to protect the input diode of isolation optocoupler U14 in a safe working voltage range, and diode D12 limits the reverse voltage of the input diode of isolation optocoupler U14 to a safe range. The pull-up resistor R22 and the phototransistor of isolation optocoupler U14 form a voltage divider circuit. The pull-up resistor R22 makes a stable high-level signal when there is no input of the switch quantity. The other three channels are the same in form. The label "DI2" sends the collected remote signal status to the CPU processing unit. The "3.3V" in all the figures is the same connection point; the main function of the circuit is to receive and detect DC 24V switch quantity signals.

[0043] The relay output module includes two eight-bit shift registers and eight-way relays. The eight-bit shift register has an eight-bit parallel buffer inside. The relay output module automatically controls the eight-way relays.

[0044] Figure 7 FIG. 1 is a circuit diagram of a relay output module according to an embodiment of the present invention. Figure 7As shown, the relay output module includes two eight-bit shift registers U5 and U6 as well as specific resistors, capacitors, optocouplers and 24V relays, which significantly improves the anti-interference ability of data communication. At the rising edge of the clock line SCK, the serial data is input to the eight-bit shift register through RCK. Whenever the rising edge of the SI signal arrives, the data of the eight-bit shift register Q0-Q7 will be stored in the eight-bit parallel buffer. When the control signal of the serial data input terminal OE is enabled at a low level, the output value of the parallel output terminal will be consistent with the value stored in the parallel output buffer, thereby achieving precise control of the eight-way relay of the device. The "3.3V" marked in the figure indicates that the voltage value is +3.3V, which comes from the 3.3V DC converted from 5V DC by the DCDC power module U4, ensuring that all related circuit points share the same stable voltage. At the same time, "24V" represents the +24V voltage, which is obtained by converting 220V AC through the AC to DC power module P2 to provide sufficient working voltage for the relay.

[0045] The DC flow acquisition module includes three three-wire temperature acquisition circuits and three DC flow acquisition circuits, wherein the temperature sensor in the three-wire temperature acquisition circuit is a PT100 platinum resistor, and the DC flow acquisition circuit is used to collect 4-20mA DC flow signals, and the signals collected by the DC flow acquisition module are input into the CPU processing unit;

[0046] Figure 8 FIG. 1 is a circuit diagram of a DC quantity acquisition module according to an embodiment of the present invention. Figure 8 As shown, the DC quantity acquisition module includes specific resistors, capacitors, magnetic beads, Schottky diodes, operational amplifiers U19, U20, and two multi-channel analog switches U17, U18, which are designed to enhance the flexibility and anti-interference ability of circuit sampling. The module can simultaneously acquire three three-wire Pt100 platinum resistors and three 4-20mA DC quantity signals. Taking the first temperature acquisition circuit as an example, it is connected to the DC1+, DC1', and DC1 interfaces. The Schottky diode D8 ensures that the "DC1+" and "DC1'" voltage signals are within a safe range, and the magnetic beads L3 and L4 effectively filter out the interference signals at the interface. The signal then passes through the analog switch U18, and after being processed by a specific operational amplifier circuit, it forms the "AD_IN4" DC voltage signal and is transmitted to the CPU processor unit. The structure of the other three acquisition circuits is the same.

[0047] In the DC current acquisition circuit, taking the second acquisition circuit as an example, the external output current signal is directly connected to DC5+, the Schottky diode D3 protects the "DC5+" voltage within a safe range, and the magnetic bead L9 filters out interface interference. The sampling resistor R17 converts the 4-20mA current signal into a voltage signal, and further processes it through a low-pass filter circuit composed of low-pass resistors R18, R13 and filter capacitor C17. Finally, "DC5+" is sent to the CPU processor unit as a DC voltage signal after the 4-20mA signal is converted by the acquisition circuit. The design principles of the other three acquisition circuits are the same.

[0048] The 12864 LCD display module is connected to the relay output module and the AC-DC power supply module, and adopts the ST7565R drive scanning method.

[0049] Fig. 9 FIG. 1 is a circuit diagram of a 12864 liquid crystal display module according to an embodiment of the present invention. Fig. 9 As shown in the figure, the 12864 LCD display module contains specific resistors, capacitors and a 12864 LCD screen, with high-speed transmission and excellent stability. Its core driving method is ST7565R drive scanning, and efficient driving can be achieved through only five IO ports: LCD_RES, LCD_SDA, LCD_SCLK, LCD_RS, and LCD_CS. The module uses SPI transmission technology. When the PS signal is pulled low, it enters the "serial transmission mode". In this mode, LCD_CS is a low-level effective enable signal, LCD_RS is used to distinguish between commands and data (1 represents data, 0 represents commands), LCD_SCLK is responsible for serial clock synchronization, and LCD_SDA is used as a serial input signal. When LCD_CS is in a low-level effective state, the rising edge of LCD_SCLK triggers the serial data to be input from LCD_SDA to the internal shift buffer. When the control signal of LCD_CS is high-enabled, the output value of the serial output terminal will be consistent with the value stored in the serial output buffer. In addition, the "3.3V" marked in the figure indicates that the operating voltage is +3.3V, which comes from the 3.3V DC power converted by the DCDC power module U4 from the 5V DC power.

[0050] In one embodiment of the present invention, the CPU processing unit adopts a high-performance 32-bit CPU, using ARMCortex TM -M0F core, main frequency is 48MHz.

[0051] In this utility model, 5G transparent transmission is used for real-time data monitoring and display and remote control, and the transformer temperature controller adopts hierarchical menu for centralized management. It has the functions of query, setting and control interaction, which improves the maintenance and management level; the transformer temperature controller display adopts Chinese menu mode, friendly human-machine interface, which can realize the arbitrary switching of interfaces, meet the needs of Chinese people, and is suitable for a wide range of people and enterprises; timely reminders of device abnormalities, alarms and tripping can be used to grasp the maintenance operations and other operating conditions of the equipment at each end of the system in real time; ensure the safety of the equipment of the box transformer, and in case of emergencies, the telemetry and telesignaling data can be sent to the remote background through 5G transparent transmission to realize real-time online monitoring, and problems can be found in time and solved in a targeted manner; save the operating costs of the power department and effectively improve work efficiency.

[0052] The transformer temperature controller provided by the utility model measures the temperature of the three-wire winding of the transformer in real time, and controls the fan according to the set start-up control value, and has high-temperature alarm and ultra-high temperature tripping output control of the three-wire winding; the dehumidifier is controlled by the real-time collection of ambient temperature and humidity; the utility model also has four-way binary input, and can be externally connected to a smoke sensor for fire warning, and output a smoke alarm dry contact signal; at the same time, the device adopts an external 5G communication module to upload the internal environmental parameters of the box transformer operation to the remote control console in real time, and the remote control console can realize remote adjustment of important data of the device and remote control of the export; on the basis of box transformer monitoring, predictive maintenance of the box transformer is realized, the operation and maintenance level of the box transformer is improved, the failure rate of the box transformer is reduced, and the power generation performance of the wind farm is improved.

[0053] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present utility model.

[0054] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transformer temperature controller, the transformer temperature controller is arranged in a box-type transformer, characterized in that: include: CPU processing unit, button module, LED indicator module, 5G communication module, switch input module, relay output module, DC acquisition module, AC-DC power supply module and 12864 LCD display module, including: The CPU processing unit is connected with the button module, LED indicator module, 5G communication module, switch input module, relay output module, DC acquisition module, AC-DC power supply module and 12864 LCD display module. The LED indicator module, switch input module, relay output module, and DC quantity acquisition module are further connected to the AC-DC power supply module. The AC-DC power supply module is used to convert 220V AC power into DC power. The AC-DC power supply module includes a filter module, an AC-DC power supply module and a DCDC power supply module. The AC-DC power supply module is connected between the filter module and the DCDC power supply module. The filter module is connected to the 220V AC power supply. The AC-DC power supply module outputs 5V DC power and 24V DC power. Among them, the 5V DC power supplies the 5G communication module, and the 24V DC power supplies the relay output module. The 5V DC power is further converted by the DCDC power supply module to obtain 3.3V DC power. The 3.3V DC power supplies the CPU processing unit, the button module, the LED indicator module, the switch input module, the relay output module, the DC acquisition module and the 12864 LCD display module; The LED indicator module is connected to the relay output module and the AC-DC power supply module. The LED indicator module includes an eight-bit shift register 74HC595, three red LEDs, a green LED, a current limiting resistor R5, a current limiting resistor R7, a current limiting resistor R8, a current limiting resistor R9, a filter capacitor EC5, a capacitor C10 and a capacitor C40. The three red LEDs and the green LED are used to indicate the following four working states: communication, abnormality, alarm, and tripping. The first end of the filter capacitor EC5 is connected to a 3.3V direct current and is connected to the three red LEDs and the green LED. The second end of the filter capacitor EC5 is grounded. The current limiting resistors R5, R7, R8 and R9 are respectively connected to the Q3-Q6 ends of the eight-bit shift register 74HC595. The VCC end of the eight-bit shift register 74HC595 is connected to the 3.3V direct current, the first end of the capacitor C10 and the first end of the capacitor C40. The second end of the capacitor C10 and the second end of the capacitor C40 are grounded. The key module is connected to the DC quantity acquisition module and the AC-DC power supply module. The key module is connected to 3.3V DC. The key module includes 8 mechanical keys, which are directly connected to the microcontroller pins. The input level of the 8 mechanical key pins IO is detected to determine whether the key is pressed. The 8 mechanical keys are used by the user to perform the following operations: up, down, left, right, add, subtract, confirm, and return. The 5G communication module includes a 5G communication submodule, a 485 chip and a single-phase inverter. The single-phase inverter is connected between the 5G communication submodule and the 485 chip. The 5G communication module is connected to a 3.3V direct current. The 485 chip has a first communication terminal and a second communication terminal. The first communication terminal communicates with the temperature and humidity sensor and the box-type transformer, and the second communication terminal communicates with the 5G communication submodule. The switch quantity input module includes four sub-circuits, each of which collects one switch quantity signal. The sub-circuit includes a 24V DC positive electrode, a first current limiting resistor, a second current limiting resistor, a diode, a voltage divider resistor, an isolation optocoupler, a pull-up resistor and a 24V DC negative electrode. The isolation optocoupler includes an input diode and a phototransistor. The voltage divider resistor protects the input diode of the isolation optocoupler within a safe operating voltage range. The diode limits the reverse voltage of the input diode of the isolation optocoupler within a safe range. The pull-up resistor and the phototransistor of the isolation optocoupler form a voltage divider circuit. The relay output module includes two eight-bit shift registers and eight-way relays. The eight-bit shift register has an eight-bit parallel buffer inside. The relay output module automatically controls the eight-way relays. The DC flow acquisition module includes three three-wire temperature acquisition circuits and three DC flow acquisition circuits, wherein the temperature sensor in the three-wire temperature acquisition circuit is a PT100 platinum resistor, and the DC flow acquisition circuit is used to collect 4-20mA DC flow signals, and the signals collected by the DC flow acquisition module are input into the CPU processing unit; The 12864 LCD display module is connected to the relay output module and the AC-DC power supply module, and adopts the ST7565R drive scanning method.

2. The transformer temperature controller according to claim 1, characterized in that: The CPU processing unit adopts a high-performance 32-bit CPU, using ARM Cortex TM -M0F core, main frequency is 48MHz.

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