An integrated ac-dc remote power supply system

Abstract

The utility model relates to communication base station power supply equipment technical field, concretely relates to a kind of AC-DC integrated remote power supply system, including local end equipment and remote equipment, the local end equipment is connected remote equipment by transmission cable, and local end equipment is equipped with DC input and AC input, and remote equipment is equipped with DC output and AC output;Local end equipment and remote equipment are connected power monitoring system, and power monitoring system is equipped with incoming line voltage acquisition circuit, outgoing line voltage acquisition circuit, current acquisition circuit and monitoring platform;The utility model passes through the rectification of optimization, boost, voltage reduction and the circuit design such as, improves overall energy conversion efficiency, reduces energy waste;It has perfect input, output protection function and monitoring and communication function, can real-time monitoring equipment operating state, promptly discovers and handles fault, ensures the stability and reliability of power supply.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply equipment for communication base stations, specifically to an AC / DC integrated remote power supply system. Background Technology

[0002] In modern communications, surveillance, and other fields, numerous devices are located in remote areas or where stable mains power is difficult to obtain. Traditional power supply methods face many challenges: (1) Difficulty in accessing mains power: For example, when building communication base stations in remote areas such as mountains and deserts, the cost of laying mains power lines is high and the construction is extremely difficult. In addition, some areas do not have the conditions for accessing mains power at all.

[0003] (2) High losses in long-distance low-voltage AC power supply: When AC mains power is used for long-distance transmission, due to the characteristics of AC power, when the current is too large, large resistance heat loss and reactive power loss caused by inductance and capacitance will be generated in the transmission line, resulting in low power supply efficiency. For example, when transmitting 10kW of low-voltage AC power over a long distance, the loss per kilometer on ordinary copper core cable may be as high as 1kW or even more.

[0004] (3) Poor compatibility of single AC remote power supply system: When only AC boost-buck remote power supply system is used for long-distance transmission, it cannot meet the power demand of DC48V DC equipment, and it is difficult to realize DC power input and battery backup power function. For example, when AC mains power fails, it is difficult to connect DC48V battery backup power.

[0005] (4) Poor reliability of single DC remote power supply system: For some existing DC remote power supply schemes, due to the electrical connection between the remote high voltage DC transmission cable and the terminal power supply system, the lightning protection performance is poor. Once a lightning strike occurs, the damage rate of the entire system is extremely high, which leads to the long-term interruption of communication base station services.

[0006] (5) Traditional remote power supply systems have high maintenance costs and poor voltage stabilization: Traditional remote power supply equipment is simply a step-up and step-down system, lacking intelligent remote monitoring and self-protection systems. The maintenance and troubleshooting of these devices require professional technicians to go to the site, wasting a lot of time and increasing maintenance costs and difficulty. Traditional voltage stabilization technology uses a simple PID algorithm, which has low voltage stabilization efficiency and poor accuracy.

[0007] Therefore, it is necessary to design an AC / DC integrated remote power supply system for communication base stations to solve the problems of high loss, poor stability, and poor accuracy of existing remote power supply systems. Utility Model Content

[0008] In view of the problems existing in the prior art, the purpose of this utility model is to provide an AC / DC integrated remote power supply system for providing stable power supply to remote electrical equipment, such as remote base stations, high-speed rail base stations, tunnel base station equipment, etc.

[0009] The technical solution adopted by this utility model to solve its technical problem is: an AC / DC integrated remote power supply system, including a central office device and a remote device. The central office device is connected to the remote device through a transmission cable. The central office device is provided with a DC input terminal and an AC input terminal, and the remote device is provided with a DC output terminal and an AC output terminal. Both the central office equipment and the remote equipment are connected to the power monitoring system, which includes an incoming line voltage acquisition circuit, an outgoing line voltage acquisition circuit, a current acquisition circuit, and a monitoring platform.

[0010] Preferably, the DC input terminal is connected to an inverter, which converts the DC voltage at the DC input terminal into an AC voltage, and the inverter and the AC input terminal are connected to a local voltage regulator.

[0011] Preferably, the local voltage regulator is connected to a step-up transformer at its rear end, and the step-up transformer is connected to a local voltage regulator SPD at its rear end.

[0012] Preferably, the local SPD is connected to the remote SPD via a transmission cable, the remote SPD is connected to a step-down transformer, the rear of the step-down transformer is connected to a remote voltage regulator, the rear of the remote voltage regulator is connected to an AC output terminal and a rectifier, and the rectifier rectifies the AC voltage into DC voltage and outputs it through the DC output terminal.

[0013] Preferably, the local voltage regulator is connected to a voltage regulator brush forward / reverse control circuit, which is connected to a voltage regulator voltage acquisition and comparison circuit and a remote control output circuit. The remote control output circuit is connected to a monitoring platform and a current acquisition circuit. The current acquisition circuit is connected to the voltage regulator voltage acquisition and comparison circuit, which acquires the AC input current value. The voltage regulator voltage acquisition and comparison circuit is connected to an incoming line voltage acquisition circuit, which acquires the voltage value of the step-up transformer.

[0014] Preferably, the remote voltage regulator is connected to a voltage regulator brush forward / reverse control circuit, which is connected to a voltage regulator voltage acquisition and comparison circuit and a remote control output circuit. The remote control output circuit is connected to a monitoring platform and a current acquisition circuit. The current acquisition circuit is connected to the voltage regulator voltage acquisition and comparison circuit, which acquires the incoming current value of the remote device. The voltage regulator voltage acquisition and comparison circuit is connected to an outgoing voltage acquisition circuit, which acquires the outgoing voltage value of the remote device.

[0015] Preferably, the AC input terminal is provided with an EMI filter circuit and an overvoltage and overcurrent protection circuit. The EMI filter circuit includes a differential mode interference suppression circuit and a common mode interference suppression circuit. The differential mode interference suppression circuit uses an X capacitor and a differential mode inductor, and the common mode interference suppression circuit uses a common mode inductor and a Y capacitor.

[0016] Preferably, both the central office equipment and the remote equipment are equipped with LCD screens, and both the central office equipment and the remote equipment can switch between viewing input voltage, output voltage, and load current information via buttons on the LCD screens.

[0017] This utility model has the following beneficial effects: This utility model designs an integrated AC / DC remote power supply system that uses voltage boosting for long-distance transmission, significantly reducing transmission losses compared to low-voltage AC / DC transmission. Optimized rectification, boost, and buck circuit designs improve overall energy conversion efficiency and reduce energy waste.

[0018] The AC / DC integrated remote power supply system designed in this utility model has complete input and output protection functions as well as monitoring and communication functions. It can monitor the working status of equipment in real time, detect and handle faults in a timely manner, and ensure the stability and reliability of power supply.

[0019] This utility model designs an integrated AC / DC remote power supply system with a relatively simple structure, small size, and convenient installation, reducing maintenance difficulty and workload. Simultaneously, the remote monitoring and communication functions facilitate timely fault detection and remote diagnosis and handling, reducing the frequency of on-site maintenance and lowering maintenance costs.

[0020] The AC / DC integrated remote power supply system designed in this utility model has a wide range of applications and is suitable for various long-distance, hard-to-access micro base stations, such as communication remote stations, high-speed rail base stations, and tunnel micro base stations, providing strong power support for the development of these fields. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the circuit structure of an AC / DC integrated remote power supply system.

[0022] Figure 2 This is the circuit diagram for acquiring the incoming line voltage.

[0023] Figure 3 This is the circuit diagram for acquiring the output voltage.

[0024] Figure 4 This is a circuit diagram for current acquisition.

[0025] Figure 5 This is a circuit diagram for voltage regulator acquisition and comparison.

[0026] Figure 6 This is a circuit diagram for controlling the forward and reverse rotation of the voltage regulator brushes.

[0027] Figure 7 This is the circuit diagram for alarm output and remote control switch output. Figure 8 This is a microcontroller circuit diagram for an AC / DC integrated remote power supply system.

[0028] In the diagram: 1-Central office equipment, 101-DC input terminal, 102-Inverter, 103-AC input terminal, 104-Central office voltage regulator, 105-Step-up transformer, 106-Central office SPD; 2-Remote equipment, 201-DC output terminal, 202-Rectifier, 203-AC output terminal, 204-Remote voltage regulator, 205-Step-down transformer, 206-Remote SPD; 3-Transmission cable; 4-Power supply monitoring system; 401-Incoming voltage acquisition circuit; 402-Outgoing voltage acquisition circuit; 403-Current acquisition circuit; 404-Voltage regulator acquisition and comparison circuit; 405-Voltage regulator brush forward and reverse control circuit; 406-Remote control output circuit; 407-Monitoring platform. Detailed Implementation

[0029] The technical solutions of the present utility model will be described in further detail below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] like Figure 1 As shown, an AC / DC integrated remote power supply system includes a central office equipment 1, a remote equipment 2, a transmission cable 3, and a power monitoring system 4. The central office equipment 1 is connected to the remote equipment 2 through the transmission cable 3.

[0031] Central office equipment 1 includes a DC input terminal 101, an inverter 102, an AC input terminal 103, a central office voltage regulator 104, a step-up transformer 105, and a central office SPD 106 (surge protector). The DC input terminal 101 is connected to the inverter 102, which converts the DC voltage from the DC input terminal 101 into AC voltage. The inverter 102 and AC input terminal 103 are connected to the central office voltage regulator 104. The central office voltage regulator 104 is connected to the step-up transformer 105, and the step-up transformer 105 is connected to the central office SPD 106. Central office equipment 1 is responsible for converting the input 48V DC voltage into 220V AC voltage, then converting it to 400V AC through the voltage regulator-step-up transformer, and finally transmitting the AC power to remote equipment 2 via transmission cable 3.

[0032] Remote device 2 is equipped with a DC output terminal 201, a rectifier 202, an AC output terminal 203, a remote voltage regulator 204, a step-down transformer 205, and a remote SPD 206 (surge protector). The local SPD 106 is connected to the remote SPD 206 via transmission cable 3. The remote SPD 206 is connected to the step-down transformer 205. The step-down transformer 205 is connected to the remote voltage regulator 204. The remote voltage regulator 204 is connected to the AC output terminal 203 and the rectifier 202. The rectifier 202 rectifies the AC voltage into DC voltage, which is output through the DC output terminal 201. Remote device 2 steps down and regulates the high-voltage AC power to 220V AC, and then rectifies it to a voltage level suitable for the load equipment, such as 48V DC.

[0033] Both the central office equipment 1 and the remote equipment 2 are connected to the power monitoring system 4. The power monitoring system 4 is equipped with an incoming line voltage acquisition circuit 401, an outgoing line voltage acquisition circuit 402, a current acquisition circuit 403, a voltage regulator voltage acquisition and comparison circuit 404, a voltage regulator brush forward and reverse rotation control circuit 405, a remote control output circuit 406, and a monitoring platform 407.

[0034] The local voltage regulator 104 is connected to the voltage regulator brush forward and reverse rotation control circuit 405. The voltage regulator brush forward and reverse rotation control circuit 405 is connected to the voltage regulator voltage acquisition and comparison circuit 404 and the remote control output circuit 406. The remote control output circuit 406 is connected to the monitoring platform 407 and the current acquisition circuit 403. The current acquisition circuit 403 is connected to the voltage regulator voltage acquisition and comparison circuit 404. The current acquisition circuit 403 acquires the current value of the AC input terminal 103. The voltage regulator voltage acquisition and comparison circuit 404 is connected to the incoming line voltage acquisition circuit 401. The incoming line voltage acquisition circuit 401 acquires the voltage value of the step-up transformer 105.

[0035] The remote voltage regulator 204 is connected to the voltage regulator brush forward and reverse rotation control circuit 405. The voltage regulator brush forward and reverse rotation control circuit 405 is connected to the voltage regulator voltage acquisition and comparison circuit 404 and the remote control output circuit 406. The remote control output circuit 406 is connected to the monitoring platform 407 and the current acquisition circuit 403. The current acquisition circuit 403 is connected to the voltage regulator voltage acquisition and comparison circuit 404. The current acquisition circuit 403 acquires the input current value of the remote device 2. The voltage regulator voltage acquisition and comparison circuit 404 is connected to the output voltage acquisition circuit 402. The output voltage acquisition circuit 402 acquires the output voltage value of the remote device 2.

[0036] like Figures 2-8The diagram shows the specific circuit design of the power monitoring system. The voltage regulator acquisition and comparison circuit 404 includes an AC power metering chip. This chip is connected to an STM32 microcontroller chip. The V1P and V1N ports of the AC power metering chip are connected to the V1P and V1N output ports of the input voltage acquisition circuit 401. The V1P and V1N output ports are connected to the input terminal of the input voltage acquisition circuit 401 via a resistor-capacitor circuit and a voltage transformer PT1. The V3P and V3N ports of the AC power metering chip are connected to the V3P and V3N output ports of the output voltage acquisition circuit 402. The V3P and V3N output ports are connected to the input terminal of the output voltage acquisition circuit 402 via a resistor-capacitor circuit and a voltage transformer PT2. The V2P and V2N ports of the AC power metering chip are connected to the V2P and V2N output ports of the current acquisition circuit 403. The V2P and V2N output ports are connected to the secondary windings of the current transformer at the input terminal of the current acquisition circuit 403 via a resistor, capacitor, and current transformer CT1. The O1 and O2 ports of the STM32 microcontroller chip are connected to the alarm output and remote control output circuit for the switch. The ELA and ELB ports of the STM32 microcontroller chip are connected to the forward and reverse rotation control circuit for the voltage regulator brushes.

[0037] The AC input terminal 103 is equipped with an EMI filter circuit and overvoltage and overcurrent protection circuits. The EMI filter circuit includes a differential-mode interference suppression circuit and a common-mode interference suppression circuit. The differential-mode interference suppression circuit uses an X capacitor and a differential-mode inductor, while the common-mode interference suppression circuit uses a common-mode inductor and a Y capacitor. This effectively filters out electromagnetic interference noise in the input line, preventing it from entering subsequent circuits and affecting the normal operation of the equipment. It is also equipped with overvoltage and overcurrent protection circuits. When the input voltage is too high or the current is too large, the circuit is automatically cut off to protect the equipment components from damage. For example, when the DC voltage instantaneously rises to above 60V (normally 40V-60V), the overvoltage protection circuit quickly cuts off the circuit within 0.1 seconds; when a short circuit occurs in the load, the protection circuit quickly cuts off the output within 0.01 seconds.

[0038] Both the central office equipment 1 and the remote equipment 2 are equipped with LCD screens. Both central office equipment 1 and remote equipment 2 can switch between viewing input voltage, output voltage, and load current information via buttons on the LCD screens.

[0039] A method for operating an AC / DC integrated remote power supply system includes the following steps: 1) The central office equipment 1 converts DC voltage to AC voltage through a DC-AC inverter 102, and then raises the voltage to a level suitable for long-distance transmission through a central office voltage regulator 104 and a step-up transformer 105, such as AC single-phase 400V. The central office equipment 1 is compatible with both AC 220V mains power and DC 48V power input. When mains power input is selected, the switch is switched to bypass input mode to reduce power loss caused by power inversion.

[0040] 2) The remote device 2 receives high-voltage AC power, which is stepped down to standard AC 220V through a step-down transformer 205 and a remote voltage regulator 204. Then, the AC voltage is converted to a voltage suitable for the load equipment through a rectifier 202; for example, 48V is used to power communication equipment. The 220V AC voltage can be directly drawn out to power AC equipment, such as fans and air conditioners.

[0041] 3) The power monitoring system 4 employs a model-predictive sliding mode control method to ensure the output voltage stability is within ±1%. Traditional PID (Proportional-Integral-Derivative) control is simple in structure and easy to implement digitally, but it lacks control accuracy and dynamic response for nonlinear loads or time-varying parameter systems. The model-predictive sliding mode control method predicts the output voltage over several future cycles based on a discrete system model. It selects the optimal control quantity by optimizing the objective function (e.g., minimizing the sum of squared voltage errors and minimizing switching actions), updates the control parameters in real time, and designs a sliding surface (e.g., a linear combination of voltage regulation error and its derivative) to force the system state to move along the sliding surface, causing the output to converge quickly to the target value. The model-predictive sliding mode control method switches the polarity of the control quantity based on the deviation between the system state and the sliding surface, thereby regulating voltage disturbances and parameter changes. In inverter voltage regulation, the sliding surface is designed as follows: Where e is the voltage error and λ is the adjustment coefficient. By controlling the switching state of the power device IGBT, S is made to approach 0. This method has strong anti-interference ability (insensitive to load changes and input fluctuations) and can respond quickly (millisecond-level recovery).

[0042] 4) The power supply monitoring system 4 monitors the equipment's operating status in real time, including parameters such as input voltage and current, output voltage and current, and alarm information. It transmits monitoring data to the monitoring platform 407 via RS485 serial communication and receives control commands and voltage regulation parameters from the monitoring platform 407. For example, when a serious fault alarm occurs, the monitoring module immediately issues an alarm signal and transmits the alarm information to the back-end monitoring center via the communication module, while simultaneously shutting down the power supply. Furthermore, based on control commands received from the back-end system, the operating parameters of the remote equipment can be adjusted, such as adjusting the output voltage.

[0043] This utility model is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model.

[0044] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. An AC / DC integrated remote power supply system, characterized in that, It includes central office equipment and remote equipment. The central office equipment is connected to the remote equipment via a transmission cable. The central office equipment is equipped with a DC input terminal and an AC input terminal, and the remote equipment is equipped with a DC output terminal and an AC output terminal. Both the central office equipment and the remote equipment are connected to the power monitoring system, which includes an incoming line voltage acquisition circuit, an outgoing line voltage acquisition circuit, a current acquisition circuit, and a monitoring platform.

2. The AC / DC integrated remote power supply system according to claim 1, characterized in that, The DC input terminal is connected to an inverter, which converts the DC voltage at the DC input terminal into an AC voltage. The inverter and the AC input terminal are connected to a local voltage regulator.

3. The AC / DC integrated remote power supply system according to claim 2, characterized in that, The local voltage regulator is connected to a step-up transformer at the rear, and the step-up transformer is connected to a local SPD at the rear.

4. The AC / DC integrated remote power supply system according to claim 3, characterized in that, The local SPD is connected to the remote SPD via a transmission cable. The remote SPD is connected to a step-down transformer. The rear of the step-down transformer is connected to a remote voltage regulator. The rear of the remote voltage regulator is connected to an AC output terminal and a rectifier. The rectifier rectifies the AC voltage into a DC voltage and outputs it through the DC output terminal.

5. The AC / DC integrated remote power supply system according to claim 4, characterized in that, The local voltage regulator is connected to the voltage regulator brush forward and reverse rotation control circuit. The voltage regulator brush forward and reverse rotation control circuit is connected to the voltage regulator voltage acquisition and comparison circuit and the remote control output circuit. The remote control output circuit is connected to the monitoring platform and the current acquisition circuit. The current acquisition circuit is connected to the voltage regulator voltage acquisition and comparison circuit. The current acquisition circuit acquires the AC input current value. The voltage regulator voltage acquisition and comparison circuit is connected to the incoming line voltage acquisition circuit. The incoming line voltage acquisition circuit acquires the voltage value of the step-up transformer.

6. The AC / DC integrated remote power supply system according to claim 4, characterized in that, The remote voltage regulator is connected to the voltage regulator brush forward and reverse rotation control circuit. The voltage regulator brush forward and reverse rotation control circuit is connected to the voltage regulator voltage acquisition and comparison circuit and the remote control output circuit. The remote control output circuit is connected to the monitoring platform and the current acquisition circuit. The current acquisition circuit is connected to the voltage regulator voltage acquisition and comparison circuit. The current acquisition circuit acquires the input current value of the remote device. The voltage regulator voltage acquisition and comparison circuit is connected to the output voltage acquisition circuit. The output voltage acquisition circuit acquires the output voltage value of the remote device.

7. The AC / DC integrated remote power supply system according to claim 1, characterized in that, The AC input terminal is equipped with an EMI filter circuit and an overvoltage and overcurrent protection circuit. The EMI filter circuit includes a differential mode interference suppression circuit and a common mode interference suppression circuit. The differential mode interference suppression circuit uses an X capacitor and a differential mode inductor, and the common mode interference suppression circuit uses a common mode inductor and a Y capacitor.

8. The AC / DC integrated remote power supply system according to claim 1, characterized in that, Both the central office equipment and the remote equipment are equipped with LCD screens, and both the central office equipment and the remote equipment can switch between viewing input voltage, output voltage, and load current information via buttons on the LCD screens.

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