Alternating current sampling power panel device for intelligent fusion terminal

Abstract

The utility model discloses an alternating-current acquisition power panel device for an intelligent fusion terminal. The alternating-current acquisition power panel device comprises a metering board, a loop inspection board, an acquisition board and a power panel, the metering board is respectively connected with the acquisition board and the power supply board, and the acquisition board is connected with the power supply board; one end of the loop inspection board is connected with the acquisition board through an SPI bus, and the other end of the loop inspection board is connected with the metering board through a UART serial port; the acquisition board comprises a combined current acquisition circuit and a combined voltage acquisition circuit; the input end of the combined current acquisition circuit is connected with the strong current interface, and the output end of the combined current acquisition circuit is respectively connected with the loop inspection board and the metering board; the input end of the combined voltage acquisition circuit is respectively connected with the strong current interface and the power supply board, and the output end of the combined voltage acquisition circuit is connected with the metering board. According to the utility model, the technical problems of complex structure, easy influence by external EMC (Electro Magnetic Compatibility) and poor stability of the traditional alternating current sampling power panel device are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent distribution network, in particular to an exchange power supply board device for an intelligent fusion terminal. Background Art

[0002] In order to meet the relevant technical specifications on intelligent fusion terminals for substations issued by the Distribution Internet of Things on No. 5, the traditional power supply board device adopts two separate branches: basic metering and substation monitoring. The basic metering unit adopts the mainstream ATT7022E, etc., which belongs to the dual-core metering architecture that meets IR46. The basic metering monitoring function of the substation is realized by the basic metering unit. The external voltage and current signals are sampled and sent to the metering chip respectively. The metering chip communicates with the metering management chip to realize the basic metering function; at the same time, the metering management chip transmits the basic metering data to the main control board, which then uploads it to the main station through Ethernet, remote communication module, etc., to realize real-time monitoring of remote telemetry data. However, the function of this solution is simple and can only realize basic metering functions, but cannot realize advanced detection functions; therefore, in order to realize high-level functions such as topology identification, fault judgment and fault recording, In order to realize the level function, a data processing unit is added to the traditional power supply board device, and the external voltage and current signals are sampled and sent to the signal conditioning circuit respectively. After filtering and amplification, they are sent to the special ADC chip for further data processing, and then the auxiliary business management chip reads the ADC chip data and interacts with the main control platform to realize the substation monitoring function; however, this method has two management chips, the architecture is complex, the cost of using ADC chips is high, and the overall substation monitoring function processing effect is affected by the effects of analog circuits such as front-end filtering and frequency selection amplification. In an industrial-grade use environment, it is easy to be affected by external EMC interference and has poor stability. In addition, due to the complex architecture, more analog circuits are used to realize the substation monitoring function. The overall device needs to occupy more space, which does not meet the current requirements for miniaturization, intelligence and low cost of low-voltage monitoring terminals. Therefore, it is urgent to propose a power supply board device for intelligent fusion terminals to solve the technical problems that the traditional power supply board device has a complex structure, is easily affected by external EMC in a complex electromagnetic environment, and has poor stability. Utility Model Content

[0003] The main purpose of the utility model is to propose an exchange power board device for an intelligent fusion terminal, aiming to solve the technical problems that the traditional exchange power board device has a complex structure, is extremely susceptible to external EMC influences in a complex electromagnetic environment, and has poor stability.

[0004] To achieve the above-mentioned purpose, the utility model provides a power supply board device for intelligent fusion terminal, wherein the power supply board device for intelligent fusion terminal comprises:

[0005] Metering board, loop inspection board, acquisition board and power supply board;

[0006] The metering board is connected to the acquisition board and the power board respectively, and the acquisition board is connected to the power board; one end of the loop inspection board is connected to the acquisition board through the SPI bus, and the other end of the loop inspection board is connected to the metering board through the UART serial port;

[0007] The acquisition board includes a combined current acquisition circuit and a combined voltage acquisition circuit; the input end of the combined current acquisition circuit is connected to the strong current interface, and the output end of the combined current acquisition circuit is respectively connected to the loop inspection board and the metering board; the input end of the combined voltage acquisition circuit is respectively connected to the strong current interface and the power supply board, and the output end of the combined voltage acquisition circuit is connected to the metering board.

[0008] In one of the preferred solutions, the combined current acquisition circuit includes an A-phase current sampling circuit, a B-phase current sampling circuit, a C-phase current sampling circuit and a zero-sequence current sampling circuit with the same structure.

[0009] One of the preferred schemes, the A-phase current sampling circuit includes a current transformer CT1; pins 3 and 4 of the current transformer CT1 are connected to the high-voltage interface; pins 1 and 2 of the current transformer CT1 are connected to the input end of the first clamping circuit, the output end of the first clamping circuit is connected to the input end of the first filtering circuit, the output end of the first filtering circuit is connected to the input end of the first sampling circuit, the output end of the first sampling circuit is connected to the input end of the second filtering circuit, and the output end of the second filtering circuit is connected to the metering board.

[0010] In one of the preferred schemes, the first clamping circuit includes a clamping diode V19 and a clamping diode V22; pin 3 of the clamping diode V19 is respectively connected to pin 1 of the current transformer CT1 and the first filtering circuit, pins 2 and 3 of the clamping diode V19 are respectively connected to pins 1 and 2 of the clamping diode V22, and pin 3 of the clamping diode V22 is respectively connected to pin 2 of the current transformer CT1 and the first filtering circuit.

[0011] In one of the preferred schemes, the first filtering circuit is a π-type filtering circuit; the first filtering circuit includes capacitor C29, capacitor C30, capacitor C37, capacitor C38, inductor L4 and inductor L6; pin 2 of the inductor L4 is respectively connected to the first clamping circuit and capacitor C29, and pin 1 of the inductor L4 is respectively connected to the first sampling circuit and capacitor C30; pin 2 of the inductor L6 is respectively connected to the first clamping circuit and capacitor C37, and pin 1 of the inductor L6 is respectively connected to the first sampling circuit and capacitor C38; the other ends of the capacitor C29, capacitor C30, capacitor C37 and capacitor C38 are grounded.

[0012] In one of the preferred embodiments, the first sampling circuit includes a sampling resistor R23 and a sampling resistor R38; one end of the sampling resistor R23 is respectively connected to the first filtering circuit and the second filtering circuit; the other end of the sampling resistor R23 is respectively connected to the resistor R34 and the ground, and the other end of the resistor R34 is respectively connected to the first filtering circuit and the second filtering circuit.

[0013] In one of the preferred solutions, the combined voltage acquisition circuit includes an A-phase voltage sampling circuit, a B-phase voltage sampling circuit and a C-phase voltage sampling circuit with the same structure.

[0014] In one of the preferred embodiments, the A-phase voltage sampling circuit includes a transformer T; pin 1 of the transformer T is connected to the current limiting circuit, and the other end of the current limiting circuit is connected to the high-voltage interface; pin 3 of the transformer T is connected to the high-voltage interface; pins 2 and 4 of the transformer T are connected to the input end of the second clamping circuit, the output end of the second clamping circuit is connected to the third filtering circuit, the output end of the third filtering circuit is connected to the second sampling circuit, and the output end of the second sampling circuit is connected to the metering board.

[0015] One of the preferred solutions, the power board includes an AC-DC switching power supply, a backup power supply and a DC-DC power supply; the input end of the AC-DC switching power supply is connected to the strong current interface, the output end of the AC-DC switching power supply is respectively connected to the backup power supply, the DC-DC power supply and the weak current interface, the output end of the backup power supply is respectively connected to the DC-DC power supply and the weak current interface, and the output end of the DC-DC power supply is connected to the metering board; the AC-DC switching power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube, and the backup power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube.

[0016] In the above technical scheme of the utility model, the cross-purchase power board device for the intelligent fusion terminal includes: a metering board, a loop inspection board, a collection board and a power board; the metering board is connected to the collection board and the power board respectively, and the collection board is connected to the power board; one end of the loop inspection board is connected to the collection board through the SPI bus, and the other end of the loop inspection board is connected to the metering board through the UART serial port; the collection board includes a combined current collection circuit and a combined voltage collection circuit; the input end of the combined current collection circuit is connected to the strong power interface, and the output end of the combined current collection circuit is connected to the loop inspection board and the metering board respectively; the input end of the combined voltage collection circuit is connected to the strong power interface and the power board respectively, and the output end of the combined voltage collection circuit is connected to the metering board. The utility model solves the technical problems that the traditional cross-purchase power board device has a complex structure, is extremely susceptible to external EMC in a complex electromagnetic environment, and has poor stability.

[0017] In the utility model, a modular design is adopted, the use of a large number of analog components and the use of dedicated ADC chips are eliminated, and the ADC data acquisition function is no longer dependent on peripheral analog circuits. The voltage signal and the current signal are obtained through a combined current acquisition circuit and a combined voltage acquisition circuit, thereby avoiding the influence of the electromagnetic environment and improving the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 This is a schematic diagram of an exchange power board device for an intelligent fusion terminal according to an embodiment of the utility model;

[0020] Figure 2 Schematic diagram of a current sampling circuit for phase A of an embodiment of the utility model;

[0021] Figure 3 Schematic diagram of a phase A voltage sampling circuit according to an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the metering chip RN2026 according to an embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of a loop inspection board according to an embodiment of the utility model.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] 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 of 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.

[0026] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] See also Figure 1 According to one aspect of the present invention, the present invention provides a power supply board device for intelligent fusion terminal, wherein the power supply board device for intelligent fusion terminal comprises:

[0029] Metering board, loop inspection board, acquisition board and power supply board;

[0030] The metering board is connected to the acquisition board and the power board respectively, and the acquisition board is connected to the power board; one end of the loop inspection board is connected to the acquisition board through the SPI bus, and the other end of the loop inspection board is connected to the metering board through the UART serial port;

[0031] The acquisition board includes a combined current acquisition circuit and a combined voltage acquisition circuit; the input end of the combined current acquisition circuit is connected to the strong current interface, and the output end of the combined current acquisition circuit is respectively connected to the loop inspection board and the metering board; the input end of the combined voltage acquisition circuit is respectively connected to the strong current interface and the power supply board, and the output end of the combined voltage acquisition circuit is connected to the metering board.

[0032] Specifically, in this embodiment, the combined current acquisition circuit includes an A-phase current sampling circuit, a B-phase current sampling circuit, a C-phase current sampling circuit and a zero-sequence current sampling circuit with the same structure.

[0033] Specifically, in this embodiment, see Figure 2The A-phase current sampling circuit includes a current transformer CT1; pins 3 and 4 of the current transformer CT1 are connected to the strong current interface; pins 1 and 2 of the current transformer CT1 are connected to the input end of the first clamping circuit, the output end of the first clamping circuit is connected to the input end of the first filtering circuit, the output end of the first filtering circuit is connected to the input end of the first sampling circuit, the output end of the first sampling circuit is connected to the input end of the second filtering circuit, and the output end of the second filtering circuit is connected to the metering board; the output signal of the current transformer CT1 passes through the first clamping circuit, the first filtering circuit, the first sampling circuit, and the second filtering circuit in sequence, and is output as a differential signal IAP and a differential signal IAN and sent to the current sampling channel of the metering board.

[0034] Specifically, in the present embodiment, the first clamping circuit includes a clamping diode V19 and a clamping diode V22; pin 3 of the clamping diode V19 is respectively connected to pin 1 of the current transformer CT1 and the first filtering circuit, pins 2 and 3 of the clamping diode V19 are respectively connected to pins 1 and 2 of the clamping diode V22, and pin 3 of the clamping diode V22 is respectively connected to pin 2 of the current transformer CT1 and the first filtering circuit; the first clamping circuit protects the components in the A-phase current sampling circuit from being damaged by high voltage shock, thereby ensuring the stable operation and long-term reliability of the electronic equipment.

[0035] Specifically, in the present embodiment, the first filtering circuit is a π-type filtering circuit; the first filtering circuit includes capacitor C29, capacitor C30, capacitor C37, capacitor C38, inductor L4 and inductor L6; pin 2 of the inductor L4 is respectively connected to the first clamping circuit and capacitor C29, and pin 1 of the inductor L4 is respectively connected to the first sampling circuit and capacitor C30; pin 2 of the inductor L6 is respectively connected to the first clamping circuit and capacitor C37, and pin 1 of the inductor L6 is respectively connected to the first sampling circuit and capacitor C38; the other ends of the capacitor C29, capacitor C30, capacitor C37 and capacitor C38 are grounded; the first filtering circuit removes unnecessary harmonics, filters out noise in the circuit, and suppresses high-frequency noise, thereby achieving signal filtering.

[0036] Specifically, in the present embodiment, the first sampling circuit includes a sampling resistor R23 and a sampling resistor R38; one end of the sampling resistor R23 is respectively connected to the first filtering circuit and the resistor R21, and the other end of the resistor R21 is connected to the second filtering circuit; the other end of the sampling resistor R23 is respectively connected to the resistor R34 and the ground, the other end of the resistor R34 is respectively connected to the first filtering circuit and the resistor R35, and the other end of the resistor R35 is connected to the second filtering circuit.

[0037] Specifically, in the present embodiment, the second filtering circuit comprises a capacitor C35, a resistor R31 and a capacitor C39; one end of the capacitor C35 is respectively connected to the resistor R21, the capacitor C31 and the metering board, and the other end of the capacitor C35 is respectively connected to the resistor R35, the capacitor C39 and the metering board; the other ends of the capacitor C31 and the capacitor C39 are grounded; secondary filtering is performed by the second filtering circuit to filter out high-frequency noise in the circuit, so that the signal output by the circuit is more stable.

[0038] Specifically, in this embodiment, the combined voltage acquisition circuit includes an A-phase voltage sampling circuit, a B-phase voltage sampling circuit, and a C-phase voltage sampling circuit with the same structure.

[0039] Specifically, in this embodiment, see Figure 3 The A-phase voltage sampling circuit includes a transformer T; pin 1 of the transformer T is connected to the current limiting circuit, and the other end of the current limiting circuit is connected to the strong current interface; pin 3 of the transformer T is connected to the strong current interface; pins 2 and 4 of the transformer T are connected to the input end of the second clamping circuit, the output end of the second clamping circuit is connected to the third filtering circuit, the output end of the third filtering circuit is connected to the second sampling circuit, and the output end of the second sampling circuit is connected to the metering board; the voltage signal is output as a VAN differential signal and a VAP differential signal through the A-phase voltage acquisition circuit and sent to the voltage sampling channel of the metering board.

[0040] Specifically, in this embodiment, the current limiting circuit is composed of a plurality of resistors. In the utility model, the current limiting circuit includes resistor R24, resistor R25, resistor R26, resistor R27, resistor R29, resistor R32, resistor R30, and resistor R33. The utility model does not specifically limit the number of resistors. The current limitation can be achieved by adjusting the resistance value of the current limiting circuit. The current flow is limited by the current limiting circuit, thereby protecting the electronic components from overload or damage.

[0041] Specifically, in the present embodiment, the second clamping circuit includes a clamping diode V20 and a clamping diode V21; pin 3 of the clamping diode V20 is respectively connected to pin 1 of the transformer T and the third filtering circuit; pins 1 and 2 of the clamping diode V20 are respectively connected to pins 2 and 1 of the clamping diode V21, and pin 3 of the clamping diode V21 is respectively connected to pin 4 of the transformer T1 and the third filtering circuit; the second clamping circuit protects the components in the A-phase voltage sampling circuit from being damaged by high voltage shock, thereby ensuring the stable operation and long-term reliability of the electronic equipment.

[0042] Specifically, in the present embodiment, the third filtering circuit is a π-type filtering circuit, and the third filtering circuit includes capacitor C32, capacitor C33, capacitor C36, capacitor C40, inductor L5 and inductor L7; pin 2 of the inductor L5 is respectively connected to the second clamping circuit and capacitor C32, and pin 1 of the inductor L5 is respectively connected to capacitor C33 and the second sampling circuit; pin 2 of the inductor L7 is respectively connected to capacitor C36 and the second clamping circuit, and pin 1 of the inductor L7 is respectively connected to capacitor C40 and the second sampling circuit; the other ends of the capacitor C32, capacitor C33, capacitor C36 and capacitor C40 are grounded; the third filtering circuit removes unnecessary harmonics, filters out noise in the circuit, and suppresses high-frequency noise, thereby achieving signal filtering.

[0043] Specifically, in this embodiment, the second sampling circuit includes a resistor R22 and a resistor R31; one end of the resistor R22 is connected to the third filtering circuit and the metering board, the other end of the resistor R22 is respectively connected to the resistor R31 and the ground, and the other end of the resistor R31 is respectively connected to the third filtering circuit and the metering board.

[0044] Specifically, in this embodiment, the A-phase voltage sampling circuit also includes a resistor R28, a capacitor C34 and a resistor R20; one end of the resistor R29 is respectively connected to the second sampling circuit, the capacitor C34, the resistor R20 and the metering board, the other end of the resistor R28 is respectively connected to the second sampling circuit, the metering board and the other end of the capacitor C34, and the other end of the resistor R20 is grounded.

[0045] Specifically, in this embodiment, see Figure 4The metering board includes a metering chip and a management chip with two SPI channels. The metering chip can be a metering chip of model RN2026, a metering chip of model HT7132 or a metering chip with other functions, and the utility model does not make specific limitations. The real-time external transmission function of the ADC data of the metering chip is used to realize the integration of basic metering and area monitoring functions. The ADC data is transmitted to the management chip in real time through a dedicated SPI channel, and the signal conditioning of the device is realized through the management chip, which avoids a large number of complex analog components and signal conditioning circuits. The structure is simple, the space occupation requirement is reduced, and the stability is better. At the same time, the requirements for the main control interface are further reduced. For the scenario where the main control interface has only one SPI and one USB, the management chip can retain the basic metering function in a transparent manner; the metering board can be connected to the weak current interface of the main control board through USB, SPI, etc.; VAP / VAN, VBP / VBN, VCP / VCN output by the combined current acquisition circuit and the combined voltage acquisition circuit; IAP / IAN, IBP / IBN, ICP / ICN, I0P / ION are respectively the corresponding three-phase voltage, three-phase current and zero-sequence current sampling signals connected to the input channel of the metering chip.

[0046] Specifically, in this embodiment, see Figure 5 The loop inspection board is connected to the combined current acquisition circuit through the SPI bus, and the loop inspection board is connected to the metering board through the UART serial port; the loop option board is used to monitor the normal connection, open circuit, short circuit and other states of the metering secondary loop; the loop inspection board accesses the three-phase combined current acquisition circuit through SPI to realize TA open and short circuit judgment, and transmits the loop inspection result to the metering board through UART. The metering board communicates with the main control board through the USB channel, gives the loop inspection result to the main control platform, and further uploads it to the main station through Ethernet and remote communication.

[0047] Specifically, in this embodiment, the power board includes an AC-DC switching power supply, a backup power supply and a DC-DC power supply; the input end of the AC-DC switching power supply is connected to the strong current interface, the output end of the AC-DC switching power supply is respectively connected to the backup power supply, the DC-DC power supply and the weak current interface, the output end of the backup power supply is respectively connected to the DC-DC power supply and the weak current interface, and the output end of the DC-DC power supply is connected to the metering board; the AC-DC switching power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube, and the backup power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube; the intelligent fusion terminal can be powered by the mains or the backup power supply, and the MOS tube is used for isolation, and the MOS tube is a low R DSMOS tube, so that the ripple factor is less than or equal to 50mV; conventionally, a diode is used for isolation. Since the voltage drop of the diode changes with the current and the internal resistance is large, it does not meet the terminal ripple factor requirements. Therefore, a low R DS The MOS tube is used to isolate the AC power supply from the backup power supply. When the AC power is on, the MOS tube corresponding to the backup power supply does not supply power. When the AC power is off, the backup power supply automatically supplies power through the MOS tube.

[0048] Specifically, in the present embodiment, the power supply board device for the intelligent fusion terminal adopts a modular design, and has the characteristics of high functional module integration, miniaturization and intelligence; based on the metering board with modular design, the functional data items related to the three-phase meter are realized, and a large amount of original acquisition data can be monitored in real time. By processing the data, it has the functions of voltage loss fault (undervoltage), power outage fault, phase failure fault, voltage overvoltage fault, current overcurrent fault, current loss, single-phase ground short circuit fault, reverse phase sequence fault, load overload fault, power failure fault and zero-sequence current fault analysis and judgment; at the same time, it supports the loop inspection function, and can make a 100% success rate judgment on the five states of TA secondary circuit normal, TA secondary circuit open, TA secondary terminal shunt, TA primary shunt, and TA circuit series rectifier device; it supports the original ADC sampling data to be transmitted to the main control board or other functional modules through a dedicated high-speed SPI, and realizes advanced functions such as topology recognition, fault recording, load recognition, and power quality analysis through a high-level chip platform and algorithm, so as to fully tap the data application value.

[0049] Specifically, in the present embodiment, the signal conditioning method of the acquisition power board device for the intelligent fusion terminal is as follows: power on the device and initialize the device; obtain ADC sampling data collected by the acquisition board; the ADC sampling data includes voltage signals and current signals; perform fault judgment according to the ADC sampling data; specifically: normalize the ADC sampling data and calculate the real-time values ​​of the voltage signal and the current signal in the ADC sampling data; perform real-time fault judgment based on the real-time value of the ADC sampling data, and if a fault occurs, actively report and save the fault information, and perform fault recording at the same time; perform signal recognition processing according to the ADC sampling data; specifically: perform legitimacy analysis on the ADC sampling data and perform FFT transformation; perform recognition analysis on the data after FFT transformation, and if a characteristic signal is recognized, save the recognition record, and the terminal or the master station reads and generates the topology of the entire device.

[0050] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power supply board device for intelligent fusion terminal, characterized in that: include: Metering board, loop inspection board, acquisition board and power supply board; The metering board is connected to the acquisition board and the power board respectively, and the acquisition board is connected to the power board; One end of the loop inspection board is connected to the acquisition board via the SPI bus, and the other end of the loop inspection board is connected to the metering board via the UART serial port; The acquisition board includes a combined current acquisition circuit and a combined voltage acquisition circuit; The input end of the combined current acquisition circuit is connected to the strong current interface, and the output end of the combined current acquisition circuit is respectively connected to the loop inspection board and the metering board; the input end of the combined voltage acquisition circuit is respectively connected to the strong current interface and the power supply board, and the output end of the combined voltage acquisition circuit is connected to the metering board.

2. The power supply board device for intelligent fusion terminal according to claim 1 is characterized in that: The combined current acquisition circuit comprises an A-phase current sampling circuit, a B-phase current sampling circuit, a C-phase current sampling circuit and a zero-sequence current sampling circuit, which have the same structure.

3. The intelligent fusion terminal power supply board device according to claim 2 is characterized in that: The A-phase current sampling circuit includes a current transformer CT1; pins 3 and 4 of the current transformer CT1 are connected to a high-voltage interface; pins 1 and 2 of the current transformer CT1 are connected to an input end of a first clamping circuit, an output end of the first clamping circuit is connected to an input end of a first filtering circuit, an output end of the first filtering circuit is connected to an input end of a first sampling circuit, an output end of the first sampling circuit is connected to an input end of a second filtering circuit, and an output end of the second filtering circuit is connected to a metering board.

4. The power supply board device for intelligent fusion terminal according to claim 3 is characterized in that: The first clamping circuit includes a clamping diode V19 and a clamping diode V22; pin 3 of the clamping diode V19 is respectively connected to pin 1 of the current transformer CT1 and the first filtering circuit, pins 2 and 3 of the clamping diode V19 are respectively connected to pins 1 and 2 of the clamping diode V22, and pin 3 of the clamping diode V22 is respectively connected to pin 2 of the current transformer CT1 and the first filtering circuit.

5. The power supply board device for intelligent fusion terminal according to claim 3 is characterized in that: The first filter circuit is a π-type filter circuit; the first filter circuit includes capacitor C29, capacitor C30, capacitor C37, capacitor C38, inductor L4 and inductor L6; pin 2 of the inductor L4 is respectively connected to the first clamping circuit and capacitor C29, and pin 1 of the inductor L4 is respectively connected to the first sampling circuit and capacitor C30; pin 2 of the inductor L6 is respectively connected to the first clamping circuit and capacitor C37, and pin 1 of the inductor L6 is respectively connected to the first sampling circuit and capacitor C38; the other ends of the capacitor C29, capacitor C30, capacitor C37 and capacitor C38 are grounded.

6. The power supply board device for intelligent fusion terminal according to claim 3 is characterized in that: The first sampling circuit includes a sampling resistor R23 and a sampling resistor R38; one end of the sampling resistor R23 is respectively connected to the first filtering circuit and the second filtering circuit; the other end of the sampling resistor R23 is respectively connected to the resistor R34 and the ground, and the other end of the resistor R34 is respectively connected to the first filtering circuit and the second filtering circuit.

7. A power supply board device for intelligent fusion terminal according to any one of claims 1 to 6, characterized in that: The combined voltage acquisition circuit comprises an A-phase voltage sampling circuit, a B-phase voltage sampling circuit and a C-phase voltage sampling circuit with the same structure.

8. The power supply board device for intelligent fusion terminal according to claim 7 is characterized in that: The A-phase voltage sampling circuit includes a transformer T; pin 1 of the transformer T is connected to the current limiting circuit, and the other end of the current limiting circuit is connected to the strong current interface; pin 3 of the transformer T is connected to the strong current interface; pins 2 and 4 of the transformer T are connected to the input end of the second clamping circuit, the output end of the second clamping circuit is connected to the third filtering circuit, the output end of the third filtering circuit is connected to the second sampling circuit, and the output end of the second sampling circuit is connected to the metering board.

9. A power supply board device for intelligent fusion terminal according to any one of claims 1 to 6, characterized in that: The power board includes an AC-DC switching power supply, a backup power supply and a DC-DC power supply; the input end of the AC-DC switching power supply is connected to the strong current interface, the output end of the AC-DC switching power supply is respectively connected to the backup power supply, the DC-DC power supply and the weak current interface, the output end of the backup power supply is respectively connected to the DC-DC power supply and the weak current interface, and the output end of the DC-DC power supply is connected to the metering board; the AC-DC switching power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube, and the backup power supply is respectively connected to the DC-DC power supply and the weak current interface through a MOS tube.

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