Long-distance power supply digital fast switching ac 220v stabilized power supply

Abstract

The application relates to the technical field of transportation and discloses a long-distance power supply digital quick switching AC220V stabilized power supply, which comprises a box body, a box door is arranged on the front face of the box body, a power supply transmission module, a step-down transformer module and a digital control unit are arranged in the box body; the power supply transmission module is used for transmitting power along a highway roadbed at 800V alternating voltage, and the transmission distance can reach 25 kilometers; the step-down transformer module adopts an annular structure and is provided with 24 taps in the secondary part and is used for reducing 800V alternating voltage to AC220V. The long-distance power supply digital quick switching AC220V stabilized power supply adopts 800V alternating voltage transmission, avoids 10kV high-voltage auxiliary equipment investment and low-voltage large-section cable loss, cooperates with a customized multi-tap annular transformer with 24 taps to realize 3% step adjustment, reduces line loss, reduces station end investment cost compared with a traditional 10kV power supply scheme, and solves the problem that low-voltage transmission distance is limited.

Description

Technical Field

[0001] This invention relates to the field of transportation technology, specifically to a long-distance power supply with digital fast switching AC220V regulated power supply. Background Technology

[0002] To comprehensively advance the construction of a strong transportation nation, with the rapid development of contemporary social science and technology, the application of intelligent power grids, digital distribution networks, and digital twin technology for terminal equipment; large-scale distributed energy; and the distribution network is accelerating its development towards the integration and interaction of power sources, grids, loads, and storage. In order to meet the special needs of long-distance power supply for AC220V power products on highways, traditional power equipment is also facing the transformation of digitalization in the wave of digitalization. Digital and intelligent power equipment is the key to the safe and stable operation of highway end-of-line electrical equipment such as toll collection systems, lane safety driving systems, and surveillance cameras.

[0003] Traditional power supply methods typically involve voltage levels of 10kV and above for long-distance power supply, specifically for highways. These long-distance power supplies have small equipment capacities and are located within 5 kilometers. If high voltage is not used and low voltage transmission is employed, the cross-section of the low-voltage cable needs to be significantly increased. Moreover, the power loss and voltage drop are large over long transmission distances, resulting in high investment costs. Using 10kV as the power supply voltage requires high-voltage switch protection equipment, step-down transformers, and low-voltage distribution cabinets, making the investment cost of such a substation very high.

[0004] Meanwhile, traditional operation and management models heavily rely on manual operation, requiring manual recording of equipment operating information, maintenance records, and power supply data such as voltage, current, power, frequency, and load. Paper documents contain all critical data. Manual operation necessitates on-site operation, which is time-consuming, especially on highways with high traffic volume. Receiving power outage information from end-point equipment and arriving at the site for maintenance takes considerable time, adding to the difficulty of operation and maintenance. Manual operation and maintenance not only consumes significant financial and material resources, but also presents a major challenge in terms of data accuracy. The simultaneity of recording temperature data and electrical parameters at key temperature measurement points cannot be precisely controlled. Similarly, the application of digital technology for querying and utilizing historical data, and comparing data from the same period and different periods, is far superior to manual recording and querying. Digital technology systems can monitor equipment operating data 24 / 7, promptly identifying potential problems and preventing malfunctions. Furthermore, paper documents are difficult to store and prone to errors, posing hidden dangers and inconveniences to equipment operation and maintenance. Therefore, there is an urgent need for a long-distance, digitally-enabled, fast-switching AC220V regulated power supply. Summary of the Invention

[0005] The purpose of this invention is to provide a long-distance power supply with digital fast switching AC220V regulated power supply to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a long-distance power supply with digital fast switching AC220V regulated power supply, including a cabinet, the front of which is provided with a door, and the cabinet is provided with a power transmission module, a step-down transformer module and a digital control unit. The power transmission module is used to transmit power along the highway roadbed at 800V AC voltage, with a transmission distance of up to 25 kilometers. The step-down transformer module adopts a ring structure and has 24 taps on the secondary side to step down 800V AC voltage to AC220V. The taps are adjusted in 3% increments (6.6V) based on AC220V. The digital control unit includes a voltage sampling circuit, a current sampling circuit, an ADC front-end circuit, a remote signaling and control circuit, and a microcontroller system, which is used to monitor power parameters in real time and control winding switching. The microcontroller system is connected to the power monitoring platform through an RS232 communication interface.

[0007] Preferably, the power transmission module uses 800V AC voltage transmission. The method for determining the voltage type is as follows: by comparing the energy loss of AC and DC transmission, avoiding the energy loss of AC-DC-AC conversion, and finally determining to use 800V AC as the transmission voltage.

[0008] Preferably, the power transmission module uses 800V AC voltage transmission. The method for determining the voltage type is as follows: by comparing the energy loss of AC and DC transmission, avoiding the energy loss of AC-DC-AC conversion, and finally determining to use 800V AC as the transmission voltage.

[0009] Preferably, the voltage sampling circuit uses a Hubei Tianrui TR1176-4C voltage transformer with a transformation ratio of 264V / 3.53V, and is combined with a first-order low-pass filter circuit, namely a 1kΩ resistor and a 103CBB capacitor, to achieve high-precision sampling of AC220V voltage.

[0010] Preferably, the current sampling circuit uses a current transformer with a transformation ratio of 100A / 100mA, combined with a 10Ω sampling resistor with 0.1% accuracy and a first-order low-pass filter circuit, namely a 1kΩ resistor and a 472CBB capacitor, to achieve stable acquisition of the current signal.

[0011] Preferably, the ADC front-end circuit uses the ADI AD7606 chip, which supports 8-channel 16-bit synchronous sampling, input range ±5V, and is equipped with an RC filter to limit out-of-band noise. The communication interface adopts parallel port mode.

[0012] Preferably, the digital control unit further includes a thyristor switching circuit, which uses a 4-16 decoder 74HC4514 and a ULN2803 driver chip to control the switching of 12 windings, triggers the bidirectional thyristor through an MOC3071 optocoupler, and uses a window comparator to determine the thyristor off state to avoid winding circulating current.

[0013] Preferably, the microcontroller system uses an STM32F407IGT6 chip, which integrates an FSMC interface, an RS232 isolated communication module, and a W5100S network chip, supporting remote meter reading, remote control operation, and status uploading, and also reserves interfaces for accessing solar energy and energy storage devices.

[0014] The control method for the long-distance power supply digital fast switching AC220V regulated power supply includes: The output voltage and current parameters are collected in real time, and the deviation is calculated by the microcontroller after being converted by the ADC. When the voltage deviation exceeds the threshold, the decoder controls the thyristor of the corresponding winding to disconnect. After the turn-off judgment circuit confirms the turn-off, the thyristor of the target winding is triggered to turn on. The power parameters and switch status are uploaded to the monitoring platform using RS232 communication to achieve remote monitoring and management.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: First, this invention uses 800V AC voltage transmission, avoiding the need for 10kV high-voltage auxiliary equipment and the loss of low-voltage large-section cables. It is combined with a customized multi-tap toroidal transformer with 24 taps that are adjusted in 3% increments to reduce line losses. Compared with the traditional 10kV power supply scheme, it reduces the investment cost at the station end and solves the problem of limited low-voltage transmission distance.

[0016] Secondly, this invention uses a digital control unit to upload electrical parameters and switch status to a monitoring platform in real time via RS232 communication, supporting remote meter reading and control, replacing manual inspection; the thyristor fast switching circuit combined with software algorithms achieves stable output during voltage surges and drops, and with high and low temperature environment testing, ensures reliable operation of the power supply under extreme conditions, reducing manual maintenance costs and safety risks.

[0017] Third, this invention provides a hardware foundation for microgrid energy access in the context of energy exchange integration by reserving access interfaces for solar and energy storage devices; based on STM32 microcontroller and digital twin technology, it can realize real-time monitoring and health analysis of the working status of power components, and promote the evolution of power supply systems towards intelligent and full life cycle management. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the equipment housing structure of the present invention; Figure 2 This is a diagram showing the tap data of the step-down transformer of this invention; Figure 3 This is a diagram of the transformer taps for this invention; Figure 4 This is the primary wiring diagram of the AC220V digital regulated power supply for long-distance power supply of the present invention; Figure 5 This is a circuit diagram of the AD7606 input front-end of the present invention; Figure 6 This is the remote control circuit diagram of the present invention; Figure 7 This is a circuit diagram of the winding switching control of the present invention; Figure 8 This is the circuit diagram of the thyristor triggering circuit of the present invention; Figure 9 This is a circuit diagram for determining the turn-off of the silicon controlled rectifier (SCR) in this invention.

[0019] Among them: 1. Box body; 2. Box door. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides the following technical solutions: Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 A long-distance power supply with digital fast switching AC220V regulated power supply includes a housing 1, a door 2 on the front of the housing 1, and a power transmission module, a step-down transformer module and a digital control unit inside the housing 1. The power transmission module is used to transmit power along the highway roadbed at 800V AC voltage, with a transmission distance of up to 25 kilometers. The step-down transformer module adopts a ring structure and has 24 taps on the secondary side to step down 800V AC voltage to AC220V. The taps are adjusted in 3% increments (6.6V) based on AC220V. The digital control unit includes a voltage sampling circuit, a current sampling circuit, an ADC front-end circuit, a remote signaling and control circuit, and a microcontroller system, which is used to monitor power parameters in real time and control winding switching. The microcontroller system is connected to the power monitoring platform through an RS232 communication interface.

[0022] The above technical solution comprises a housing 1, which houses a power transmission module, a step-down transformer module, and a digital control unit. Its working principle is as follows: the power transmission module transmits electricity along the highway roadbed at 800V AC voltage, achieving a transmission distance of 25 kilometers; the step-down transformer module adopts a ring structure with 24 taps on the secondary side, capable of stepping down 800V AC voltage to AC220V. The taps are adjusted in 3% increments (6.6V) based on AC220V; the digital control unit includes a voltage sampling circuit, a current sampling circuit, an ADC front-end circuit, a remote signaling and control circuit, and a microcontroller system. It can monitor power parameters in real time and control winding switching. The microcontroller system is connected to the power monitoring platform via an RS232 communication interface, thereby achieving effective control and monitoring of the regulated power supply.

[0023] The power transmission module uses 800V AC voltage transmission. The method for determining the voltage type is as follows: comparing the energy loss of AC and DC transmission, avoiding the energy loss of AC-DC-AC conversion, and finally determining to use 800V AC as the transmission voltage.

[0024] Through the above technical solution, the power transmission module adopts 800V AC voltage transmission. This was determined after comparing the energy loss of AC and DC transmission. Because an AC-DC-AC conversion method would result in energy loss, 800V AC was ultimately selected as the transmission voltage to reduce energy loss and improve transmission efficiency. The following table shows the transformer parameters: The secondary taps of the step-down transformer module include 24 voltage output levels, of which the 19th level is the AC220V reference level. The upper 18 levels increase in 3% increments, and the lower 5 levels decrease in 3% increments. The wire diameter of each winding is selected according to a 10A current to ensure that the output power of each level is constant at 2kW.

[0025] Through the above technical solution, the secondary tap of the step-down transformer module has 24 voltage output levels, with the 19th level being the AC220V reference level. The upper 18 levels increase in 3% increments, and the lower 5 levels decrease in 3% increments. Furthermore, the wire diameter of each winding is selected based on a 10A current, which ensures that the output power of each level is constant at 2kW, thereby stabilizing the output voltage and meeting the needs of different loads.

[0026] The voltage sampling circuit uses a Hubei Tianrui TR1176-4C voltage transformer with a transformation ratio of 264V / 3.53V, and is equipped with a first-order low-pass filter circuit, namely a 1kΩ resistor and a 103CBB capacitor, to achieve high-precision sampling of AC220V voltage.

[0027] Through the above technical solution, the voltage sampling circuit uses Hubei Tianrui TR1176-4C voltage transformer with a transformation ratio of 264V / 3.53V, and is equipped with a first-order low-pass filter circuit. The first-order low-pass filter circuit consists of a 1kΩ resistor and a 103CBB capacitor, which can achieve high-precision sampling of AC220V voltage and provide accurate voltage data for subsequent voltage monitoring and control.

[0028] The current sampling circuit uses a current transformer with a transformation ratio of 100A / 100mA, combined with a 10Ω sampling resistor with 0.1% accuracy and a first-order low-pass filter circuit, namely a 1kΩ resistor and a 472CBB capacitor, to achieve stable acquisition of the current signal.

[0029] Through the above technical solution, the current sampling circuit utilizes a current transformer with a transformation ratio of 100A / 100mA, paired with a 10Ω sampling resistor with 0.1% accuracy and a first-order low-pass filter circuit. The first-order low-pass filter circuit consists of a 1kΩ resistor and a 472CBB capacitor, thereby achieving stable acquisition of the current signal, accurately monitoring the current status, and ensuring the reliable operation of the regulated power supply.

[0030] The ADC front-end circuit uses the ADI AD7606 chip, which supports 8-channel 16-bit synchronous sampling, with an input range of ±5V. It is equipped with an RC filter to limit out-of-band noise, and the communication interface adopts parallel port mode.

[0031] The above technical solution uses the AD7606 chip from Analog Devices (ADI) for the ADC front-end circuit. This chip supports 8-channel 16-bit synchronous sampling with an input range of ±5V. With an RC filter, it can limit out-of-band noise. The communication interface adopts parallel port mode, which can efficiently convert the acquired analog signals into digital signals for processing and analysis by the microcontroller system.

[0032] The digital control unit also includes a thyristor switching circuit, which uses a 4-16 decoder 74HC4514 and a ULN2803 driver chip to control the switching of 12 windings. The bidirectional thyristor is triggered by an MOC3071 optocoupler, and a window comparator is used to determine the thyristor's off state to avoid winding circulating current.

[0033] Through the above technical solution, the thyristor switching circuit in the digital control unit controls the switching of 12 windings using a 74HC4514 4-to-16 decoder and a ULN2803 driver chip. The MOC3071 optocoupler triggers the bidirectional thyristor, and a window comparator is used to determine the thyristor's off-state. This effectively avoids winding circulating currents and ensures the safety and reliability of the switching process.

[0034] The microcontroller system uses an STM32F407IGT6 chip, which integrates an FSMC interface, an RS232 isolated communication module, and a W5100S network chip. It supports remote meter reading, remote control operation, and status uploading, and has reserved interfaces for accessing solar energy and energy storage devices.

[0035] Through the above technical solution, the microcontroller system adopts the STM32F407IGT6 chip, which integrates the FSMC interface, RS232 isolated communication module and W5100S network chip. It has functions such as remote meter reading, remote control operation and status uploading, and has reserved interfaces for accessing solar energy and energy storage devices, which facilitates the subsequent functional expansion and optimization of the regulated power supply.

[0036] Control methods for long-distance power supply with digital fast switching of AC220V regulated power supply include: The output voltage and current parameters are collected in real time, and the deviation is calculated by the microcontroller after being converted by the ADC. When the voltage deviation exceeds the threshold, the decoder controls the thyristor of the corresponding winding to disconnect. After the turn-off judgment circuit confirms the turn-off, the thyristor of the target winding is triggered to turn on. The power parameters and switch status are uploaded to the monitoring platform using RS232 communication to achieve remote monitoring and management.

[0037] The control method for a long-distance digital fast-switching AC220V regulated power supply using the above technical solution is as follows: First, the output voltage and current parameters are collected in real time, and the deviation is calculated by the microcontroller after ADC conversion. When the voltage deviation exceeds the set threshold, the thyristor of the corresponding winding is disconnected through the decoder. After the shutdown judgment circuit confirms, the thyristor of the target winding is triggered to conduct. At the same time, the power parameters and switch status are uploaded to the monitoring platform using RS232 communication, thereby realizing remote monitoring and management of the regulated power supply and improving its intelligence and convenience.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A long-distance power supply with digital fast switching AC220V regulated power supply, characterized in that: Includes a housing (1), the front of which is provided with a door (2), and inside the housing (1) are a power transmission module, a step-down transformer module and a digital control unit; The power transmission module is used to transmit power along the highway roadbed at 800V AC voltage, with a transmission distance of up to 25 kilometers. The step-down transformer module adopts a ring structure and has 24 taps on the secondary side to step down 800V AC voltage to AC220V. The taps are based on AC220V and are adjusted in 3% increments, i.e., 6.6V. The digital control unit includes a voltage sampling circuit, a current sampling circuit, an ADC front-end circuit, a remote signaling and control circuit, and a microcontroller system, which is used to monitor power parameters in real time and control winding switching. The microcontroller system is connected to the power monitoring platform through an RS232 communication interface.

2. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The power transmission module uses 800V AC voltage transmission. The method for determining the voltage type is as follows: comparing the energy loss of AC and DC transmission, avoiding the energy loss of AC-DC-AC conversion, and finally determining to use 800V AC as the transmission voltage.

3. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The secondary taps of the step-down transformer module include 24 voltage output levels, of which the 19th level is the AC220V reference level. The upper 18 levels increase in 3% increments, and the lower 5 levels decrease in 3% increments. The wire diameter of each winding is selected according to a 10A current to ensure that the output power of each level is constant at 2kW.

4. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The voltage sampling circuit uses a Hubei Tianrui TR1176-4C voltage transformer with a transformation ratio of 264V / 3.53V, and is equipped with a first-order low-pass filter circuit, namely a 1kΩ resistor and a 103CBB capacitor, to achieve high-precision sampling of AC220V voltage.

5. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The current sampling circuit uses a current transformer with a transformation ratio of 100A / 100mA, combined with a 10Ω sampling resistor with 0.1% accuracy and a first-order low-pass filter circuit, namely a 1kΩ resistor and a 472CBB capacitor, to achieve stable acquisition of the current signal.

6. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The ADC front-end circuit uses the ADI AD7606 chip, which supports 8-channel 16-bit synchronous sampling, with an input range of ±5V. It is equipped with an RC filter to limit out-of-band noise, and the communication interface adopts parallel port mode.

7. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The digital control unit also includes a thyristor switching circuit, which uses a 4-16 decoder 74HC4514 and a ULN2803 driver chip to control the switching of 12 windings. The bidirectional thyristor is triggered by an MOC3071 optocoupler, and a window comparator is used to determine the thyristor's off state to avoid winding circulating current.

8. The long-distance power supply with digital fast switching AC220V regulated power supply according to claim 1, characterized in that: The microcontroller system uses an STM32F407IGT6 chip, which integrates an FSMC interface, an RS232 isolated communication module, and a W5100S network chip. It supports remote meter reading, remote control operation, and status uploading, and has reserved interfaces for accessing solar energy and energy storage devices.

9. The control method for long-distance power supply digital fast switching AC220V regulated power supply according to any one of claims 1-8, characterized in that, include: The output voltage and current parameters are collected in real time, and the deviation is calculated by the microcontroller after being converted by the ADC. When the voltage deviation exceeds the threshold, the decoder controls the thyristor of the corresponding winding to disconnect. After the turn-off judgment circuit confirms the turn-off, the thyristor of the target winding is triggered to turn on. The power parameters and switch status are uploaded to the monitoring platform using RS232 communication to achieve remote monitoring and management.

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