CN216817219U

CN216817219U - Lightweight collector of many meters of battery powered interface

Info

Publication number: CN216817219U
Application number: CN202220614279.2U
Authority: CN
Inventors: 陈旭锋; 刘乐盈; 卢璐
Original assignee: XI'AN FLAG ELECTRONICS CO Ltd
Current assignee: XI'AN FLAG ELECTRONICS CO Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-06-24
Anticipated expiration: 2032-03-16

Abstract

The utility model belongs to the technical field of water meters, and relates to a light-weight collector of a battery-powered multi-meter interface, which comprises a main control CPU, an uplink NB network interface circuit, an uplink infrared debugging interface circuit, a Bluetooth meter Bluetooth debugging interface circuit, a 485 meter interface circuit, an MBUS meter interface circuit, a local storage module, a download interface and a battery-powered interface; communicating meters with various different communication interfaces through a master control CPU, uploading the meters to a server through an NB network, and downloading instruction information issued by the server to the master control CPU; the utility model solves the problem that the method is only suitable for large-scale centralized single-interface type water and electricity meter data acquisition occasions, and breaks through the cost performance limit that the centralized data acquisition unit is suitable for being used when the management quantity exceeds thousands of water meters.

Description

Lightweight collector of many meters of battery powered interface

Technical Field

The utility model belongs to the technical field of water meters, and relates to a light-weight collector with a plurality of battery-powered meter interfaces.

Background

The collector is a water meter data collecting and transmitting device which can report the data of a plurality of water meters to a network server according to the requirement of a protocol after collecting, storing and analyzing the data, can analyze the instruction sent by the network server and then sends the instruction to the water meters, and realizes the interactive communication between the meters and a server platform. The existing water meters are divided into two types, one type is that the water meters have remote water meters which interact with a server network, such as NB meters, GPRS meters, short message meters and the like; the other type is that the water meter does not have a networking function, data of the water meter is uploaded to acquisition equipment in a wired or small wireless mode, the acquisition equipment interacts the meter data with a network server, and the meters comprise an MBUS meter, a Bluetooth meter, a lora meter and the like. Therefore, the adaptive meter of the collector is various water, electricity and gas meters without networking and remote transmission. The traditional collector is usually used in the data collection occasions of large-scale centralized water and electricity meters, more than 1000 water and electricity meters can be managed simultaneously, and the management efficiency is greatly improved.

However, the concentrator with such a scale is connected with the number of meters, and the problems of high cost, high difficulty in water meter wiring construction, high power consumption, external power supply requirement and inflexible use scene are brought, so that in the increasing data acquisition occasions of small-scale centralized water and electricity meters, the traditional collector is difficult to meet the increasing demand of small-scale centralized water and electricity meter data acquisition due to high cost, complex wiring construction, external power supply requirement, high power consumption and the like.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a light collector with a battery-powered multi-meter interface, which is used for meeting the requirements of the environment that an external power supply cannot be used, the number of meters is not large and networking is required under the scenes of inconvenient wiring, relatively less water collection and relatively less electric meters, such as every floor of corridor, underground and the like. Lightweight collector provides the interface of polytype, can read various interface type meters, like the bluetooth water gauge, MBUS water gauge, LORA water gauge, 485 ammeters etc..

The technical scheme adopted by the utility model is as follows: a lightweight collector of a battery-powered multi-meter interface comprises a main control CPU, an uplink NB network interface circuit, an uplink infrared debugging interface circuit, a Bluetooth meter Bluetooth debugging interface circuit, a 485 meter interface circuit, an MBUS meter interface circuit, a local storage module, a download interface and a battery-powered interface; the main control CPU is used as a core processing unit for providing circuit connection and data processing for each module and circuit; the uplink NB network interface circuit is used for uploading the data of each table collected by the main control CPU to the server through the NB network and downloading the instruction information issued by the server to the main control CPU; the uplink infrared debugging interface circuit is used for connecting debugging equipment in an infrared mode to debug, maintain and upgrade each meter; the Bluetooth debugging interface circuit of the Bluetooth meter is used for connecting the Bluetooth with each meter and is also used for connecting a debugging device by Bluetooth to debug, maintain and upgrade each meter; the 485 meter interface circuit is used for connecting each meter of the 485 interface; the MBUS meter interface circuit is used for connecting each meter of the MBUS bus interface; the local storage module is used for storing the table information acquired by the main control CPU to the local for servo uploading; the download interface is used for downloading the information of each table collected by the main control CPU in a local data line mode; the battery power supply interface is used for supplying power to the whole collector; the master control CPU is electrically connected with the uplink NB network interface circuit, the uplink infrared debugging interface circuit, the Bluetooth debugging interface circuit of the Bluetooth meter, the 485 meter interface circuit, the MBUS meter interface circuit, the local storage module and the download interface.

Preferably, the main control CPU adopts a micro low power consumption CM0+ kernel MCU, and the chip model of the main control CPU is FM33LC 026N.

Preferably, the uplink NB network interface circuit includes: an NB module U8, a patch SIM card U9, 0603 packaging patch resistors R68-R84, 0603 packaging patch capacitors C32-C43, a TVS tube D11, an NMOS tube Q13, a patch LED lamp D12 and NPN triodes Q14-Q17; the connection mode of the uplink NB network interface circuit is as follows: capacitors C32-C35 and TVS are connected in parallel, one end of each capacitor is grounded, the other end of each capacitor is connected with a VBAT pin of the NB module U8, a drain electrode of the Q13 is connected with the VBAT pin of the NB module U8, a source electrode of the Q13 is connected with a system power supply VCC, and gate link resistors R68 and R69 of the Q13 control the power supply of the NB module through an NB _ POW pin of the CPU; the SIM card paster SIM card U9 is linked with a SIM card interface of the module NB module U8 through resistors R72-R75, one ends of capacitors C37-C40 are grounded, one ends of the capacitors are connected with

pins

6, 3, 7 and 8 of the paster SIM card U9, one end of a capacitor C36 is connected with pin 1 of the paster SIM card U9, and the other end of the capacitor C36 is connected with pin 8 of the paster SIM card U9; one end of a resistor R79 and a capacitor C42 is connected with a VDD _ EXT pin of the NB module U8, the other end of the resistor R79 and the capacitor C42 is connected with a base electrode of a triode Q16, one end of a resistor R80 is connected with the VDD _ EXT pin of the NB module U8, the other end of the resistor R80 is connected with a collector electrode of the Q16 and an RX pin of the NB module U8, one end of the resistor R81 is connected with an NB _ TX pin of a CPU, and the other end of the resistor R81 is connected with an emitter electrode of the Q16; one ends of a resistor R84 and a capacitor C43 are connected with a VDD _ EXT pin of the NB module U8, the other ends of the resistor R84 and the capacitor C43 are connected with a base electrode of a triode Q17 and a collector electrode of a resistor R83 which are connected with a system voltage VCC, the other ends of the resistor R83 are connected with a collector electrode of a Q17 and an NB _ RX pin of a CPU, one end of the resistor R82 is connected with a TX pin of the NB module U8, and the other end of the resistor R82 is connected with an emitter electrode of the NB 17; the base and the two ends of the emitter of the triode Q14 are connected with the resistor R70, the emitter of Q14 is grounded, the collector of Q14 is connected with the 15 pin of the NB module U8, and the NB _ RS pin of the CPU is connected with the base of the triode Q14 through R71; the pin 18 of the NB module U8 is connected with the base of a triode Q15 through a resistor R77, the two ends of the base and the emitter of the triode Q15 are connected with a resistor R78, the emitter of Q15 is grounded, the resistors R76 and D12 are connected between the collector of the Q15 and the power supply battery voltage VBAT in series, one end of a capacitor C41 is grounded, and the other end of the capacitor C41 is connected with a VDD _ EXT pin of the NB module U8; j1 is connected with 53 pins of the NB module U8;

the uplink NB network interface circuit adopts remote communication BC35-G, the interface part with the MCU adopts triodes Q16, Q17 and a level conversion circuit of peripheral resistors thereof, and VDD _ EXT is the output voltage 1V8 of the module; the master MCU controls the power supply of the module using the NB _ POW pin.

Preferably, the uplink infrared debugging interface circuit includes: an infrared receiving head U2, an infrared transmitting tube D1, a 0603 patch resistor R1, R2, R6, R9, R11, R12, a 0603 patch capacitor C2, C3, a triode Q2 and Q3; the connection mode of the uplink infrared debugging interface circuit is as follows: the 3 pin of the infrared receiving head U2 is connected with the collector of the triode Q2, one end of C2 and one end of R6, the other end of C2 is grounded, the other end of R6 is connected with the 1 pin of the infrared receiving head U2 and one end of R9, and the other end of R9 is connected with the RED _ RXD pin of the CPU; the base electrode of the triode Q2 is connected with one end of the resistors R1 and R2, the other end of R2 is connected with the RED _ EN pin of the CPU, and the other end of R1 is connected with the collector electrode of the triode Q2 and a system power VCC; the collector of the triode Q3 is connected with the anode of the D1, the cathode of the D1 is grounded, the base of the triode Q3 is connected with one end of a resistor R12, the other end of the R12 is connected with the RED _ TXD pin of the CPU, the emitter of the triode Q3 is connected with a resistor R11 to a system VCC, one end of the C3 is connected with the system VCC, and the other end of the C3 is grounded;

the power supply part of an infrared receiving tube U2 of the uplink infrared debugging interface circuit is controlled by RED _ EN of the MCU, and a received signal RED _ RXD is directly sent to a serial port receiving pin of the MCU; and the infrared transmitting tube D1 is controlled by a serial port transmitting pin RED _ TXD of the MCU.

Preferably, the bluetooth debugging interface circuit of the bluetooth watch includes: bluetooth module E92, bluetooth table bluetooth debugging interface circuit's connected mode does: the Bluetooth module E92 is connected with the CPU, a pin 17 of the Bluetooth module E92 is connected with an RED _ TXD pin of the CPU, a pin 18 of the Bluetooth module E92 is connected with an RED _ RXD pin of the CPU, and a pin 23 of the Bluetooth module E92 is connected with a BLE _ EN pin of the CPU;

bluetooth watch Bluetooth debugging interface electricity adopts the E92 module of rilda, and this module is master-slave integrative module, and interface circuit is simple, and its intercommunication can be used for the adaptation cell-phone APP, and downlink communication mainly reads the Bluetooth watch. The interface and the infrared share one path of serial port, and the software is designed to be time-sharing multiplexing.

Preferably, the 485 table interface circuit includes: 485 transceiver U1, 0603 patch resistor R3, R4, R5, R7, R8, R10, 0603 patch capacitor C1, PMOS tube Q1 and meter interface P3; the 485 meter interface circuit is connected in the following mode: the 1 pin of the 485 transceiver U1 and one end of R3 are connected with an RS485_ RX pin of the CPU, the other end of R3 and an 8 pin of the 485 transceiver U1, one end of C1, a source of Q1 and one end of R5 are connected together, the other end of C1 is grounded, the other end of R5 is connected with a 7 pin of the 485 transceiver U1 and a 1 pin of P3, two ends of R8 are respectively connected with a 6 pin and a 7 pin of the 485 transceiver U1 and a 1 pin and a 2 pin of P3, one end of R10 is connected with a 6 pin of the 485 transceiver U1 and a 2 pin of the P3, the other ends are grounded, one ends of R4 and R7 are connected with a grid of Q1 together, the other end of R4 is connected with a system VCC, and the other end of R7 is connected with an RS485_ POW of the CPU;

the 485 meter interface circuit is used for connecting a 485 interface water meter and a pin RS485_ POW and is used for controlling a 485 chip power supply of the U1, the RS485_ RX and the RS485_ TX are connected to a serial port UART of the MCU, and the RS485_ EN is used for controlling the 485 chip to enable an IO port of the MCU.

Preferably, the MBUS meter interface circuit includes: the MBUS meter interface circuit comprises a BOOST BOOST chip, resistors R3, R6, R9-R12, R14, R22, capacitors C1-C4, C6, C7, C8, a diode D4, an inductor L1 and an MOS tube Q1, and the connection mode of the MBUS meter interface circuit is as follows: the current input end VCC is connected with the source electrode of a MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a resistor R12, the other end of the resistor R12 is connected with an enable EN, a resistor R11 is also connected between the enable EN and the input current VCC, the drain electrode of the MOS tube Q1 is connected with a capacitor C1, the other end of a capacitor C1 is grounded, the drain electrode of a MOS tube Q1 is connected with a capacitor C2, the other end of the capacitor C2 is grounded, the drain electrode of a MOS tube Q1 is connected with a resistor R10, the other end of the resistor R10 is connected with a pin 2 of the BOOST BOOST chip, the drain electrode of the MOS tube Q1 is connected with an inductor L1, the other end of the inductor L1 is respectively connected with

pins

4, 5 and 6 of the BOOST BOOST chip and the anode of a diode D4, the cathode electrode of a diode D4 is connected with a resistor R4, the cathode electrode of the diode D4 is connected with a circuit output end, the cathode electrode of the diode D4 is connected with a capacitor C4, the other end of the capacitor C4 is connected with a capacitor C4, and the other end of the capacitor C4 is grounded, the negative electrode of the diode D4 is connected with a capacitor C8, the other end of the capacitor C8 is grounded, a pin 1 of the BOOST BOOST chip is connected with a resistor R6, the other end of the resistor R6 is connected with a capacitor C3, the other end of the capacitor C3 is grounded, a pin 7 of the BOOST BOOST chip is connected with a capacitor C6, the other end of the capacitor C6 is grounded,

pins

8, 9, 10 and 11 of the BOOST BOOST chip are grounded, a pin 12 of the BOOST BOOST chip is connected with a capacitor C4, the other end of the capacitor C4 is grounded, a pin 13 of the BOOST BOOST chip is connected with a resistor R9, the other end of the resistor R9 is grounded, a pin 14 of the BOOST BOOST chip is connected with a resistor R13, and the other end of the resistor R13 is grounded; the high-power transistor Q6, the MOS transistor Q5, the voltage-stabilizing diode D9, the Schottky diode D8, the triode Q7, the resistors R34-R39, the capacitors C9 and C10; the pin MBUS _ TXD of the master control CPU is connected with a resistor R39, the other end of the resistor R39 is grounded, the pin MBUS _ TXD of the master control CPU is connected with a resistor R36, the other end of the resistor R36 is connected with the base electrode of a triode Q7, the emitter electrode of the triode Q7 is grounded, the collector electrode of the triode Q7 is sequentially connected with a resistor R7 and a resistor R7 in series and then connected with the grid electrode of a MOS tube Q7, a resistor R7 and a resistor R7 are connected between the resistor R7 and the resistor R7, the other end of the resistor R7 is connected with the source electrode of the MOS tube Q7, the other end of the resistor R7 is connected with a resistor R7, the other end of the resistor R7 is connected with the cathode electrode of a Zener diode D7, the cathode electrode of the Zener diode D7 is connected with the ground, the cathode electrode of the capacitor C7 is connected with the ground, the cathode electrode of the Schottky diode D7 is connected with the collector electrode of the high power transistor Q7, the emitter electrode of the Schottky diode Q7 is connected with the collector electrode of the Schottky diode Q7, the anode of the Schottky diode D8 is connected with a capacitor C9, the other end of the capacitor C9 is grounded, the drain of the MOS transistor Q5 is connected to VBUS, one ends of R37 and R38, the source of the MOS transistor Q5 and the collector of the high-power transistor Q6 are all connected to an output end power supply POW of the power supply circuit;

the MBUS meter interface circuit further comprises: an operational amplifier U1, a comparator U2, diodes D1 and D2, a double diode D3, resistors R1, R2, R4, R5, R7, R8, R13, R15-R21 and a capacitor C5; the MBUS bus is connected with the anode of a diode D1, the cathode of a diode D1 is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the anode of a double diode D3, the two cathodes of a double diode D3 are respectively connected with a resistor R5 and a resistor R21 and then connected with a pin 5 and a pin 10 of an operational amplifier U1, the two cathodes of a double diode D3 are respectively connected with a resistor R4 and a resistor R20 and then respectively connected with the ground, one end of the cathode of a double diode D4972, which is connected with a capacitor C5, the other end of the capacitor C5 is connected with the ground, a pin 6 of the operational amplifier U5 is connected with a resistor R5 and then connected with a pin 7 of the operational amplifier U5, a pin 5479 of the operational amplifier U5 is connected with a resistor R5 and then connected with a pin 6858 of the operational amplifier U5, a pin 6 of the operational amplifier U5 is connected with a resistor R5 and then connected with a pin 5, pin 8 of an operational amplifier U1 is connected with a resistor R18 and then connected with pin 3 of an operational amplifier U1, pin 3 of the operational amplifier U1 is connected with a resistor R19 and then grounded, pin 2 of an operational amplifier U1 is connected with a resistor R8 and then connected with pin 1 of an operational amplifier U1, pin 4 of the operational amplifier U1 is connected with a power supply POW, pin 11 of the operational amplifier U1 is grounded, pin 2 of the operational amplifier U1 is connected with a resistor R15 and then connected with pin 2 of a comparator U2, pin 3 of the comparator U2 is connected with a resistor R1 and then connected with the power supply POW, pin 3 of the comparator U2 is connected with a resistor R2 and then grounded, pin 4 of the comparator U2 is grounded, pin 8 of the comparator U2 is connected with the power supply POW, and pin 1 of the comparator U2 is connected with an MBUS _ RXD pin of a main control CPU;

the MBUS meter interface circuit further comprises: a gate connection bus of the MOS transistor Q2 passes through a voltage division resistor network TX _ F, and a source electrode and a drain electrode of the MOS transistor Q2 are respectively connected with a cathode of the double diode D3; the circuit comprises a comparator U2, MOS transistors Q3, Q4, diodes D5, D6 and D7, and resistors R23, R24 and R29-R33; the MBUS bus is respectively connected with the drain of a MOS tube Q3 and the gate of a MOS tube Q4, the source of the MOS tube Q3 is connected with a sampling circuit R25-R28 and then is connected with VBUS, the gate of the MOS tube Q3 is connected with a power supply POW after being connected with a resistor R32, the gate of the MOS tube Q3 is connected with a pin 7 of a comparator U2, a pin 5 of the comparator U2 is connected with a resistor R33 and then is connected with a power supply POW, a pin 5 of the comparator U2 is connected with a resistor R31 and then is grounded, a pin 6 of the comparator U31 is connected with a resistor R31 and then is connected with VBUS, a pin 6 of the comparator U31 is connected with the source of a MOS tube Q31, the drain of the MOS tube Q31 is grounded, the gate of the MOS tube Q31 is connected with a resistor R31 and then is connected with the anode of a diode D31, the cathode of the diode D31 is connected with a diode D31, the anode of the diode D31 is connected with a diode TXF 31 and the anode of the diode OLF 31 is connected with the diode 31 and the diode TXF 31 and the cathode of the diode is connected with the diode OLF 31; the resistors R25-R28, the connection mode of the sampling circuit is as follows: one end of each resistor R25-R28 is connected with the source electrode of the MOS transistor Q3 after being connected in series, and the other end is connected with VBUS;

after the interface circuit of the MBUS meter adopts a boosted DC-DC to MBUS level, serial port TXD signals of the MCU are modulated into MBUS + through peripheral circuits such as Q28, Q25 and Q26 and then sent to the meter, return current signals of the meter pass through an instrument amplifying circuit consisting of an amplifier patch SIM card U9 and the peripheral circuits, and then pass through a stronger U10, and finally the meter signals are converted into RXD signals which can be identified by the MCU.

The utility model has the beneficial effects that:

1. the utility model adopts the battery to supply power to drive the meters with various different communication interfaces, does not need complicated wiring construction in construction, can meet the requirement that the meters with various different interface types can carry out data acquisition in different scenes, solves the problem that the traditional method is only suitable for large-scale centralized data acquisition occasions with single interface type water and electricity meters, and breaks through the cost performance limit that the centralized data acquisition device is suitable for being used when the management quantity exceeds thousands of water meters, thereby having more flexible use modes and better cost performance.

2. The utility model adopts a micro low power consumption CM0+ kernel MCU, and the lowest power consumption is only about 1uA in a sleep mode; the utility model adopts a small-sized Internet of things operating system contiki, the operating system principle is based on event driving, the transplantation is convenient, the requirement on hardware is low, the system overhead is low, the power consumption is low, and the efficiency is high; the related hardware part also adopts a low-power consumption device, and is closed at any time when not in use, so that the power consumption is reduced to the maximum extent, and therefore, the utility model has lower power consumption.

Drawings

FIG. 1 is a schematic diagram of a lightweight collector for a battery-powered multi-meter interface;

FIG. 2 is a master CPU circuit diagram;

fig. 3 is a circuit diagram of an upstream NB network interface;

FIG. 4 is a circuit diagram of a local memory module;

FIG. 5 is a 485 table interface circuit;

FIG. 6 is a circuit diagram of an upstream infrared debug interface;

FIG. 7 is a circuit diagram of a Bluetooth debug interface of the Bluetooth watch;

FIG. 8 is a functional trigger circuit diagram of the harvester;

fig. 9 is a MBUS table interface circuit diagram.

Detailed Description

The related art in the present invention will be described clearly and completely with reference to the accompanying drawings in the following embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-9, a lightweight collector of a battery-powered multi-meter interface comprises a main control CPU, an uplink NB network interface circuit, an uplink infrared debugging interface circuit, a bluetooth meter bluetooth debugging interface circuit, a 485 meter interface circuit, an MBUS meter interface circuit, a local storage module, a download interface, and a battery-powered interface; the main control CPU is used as a core processing unit for providing circuit connection and data processing for each module and circuit; the uplink NB network interface circuit is used for uploading the data of each table acquired by the main control CPU to a server through an NB network and downloading the instruction information issued by the server to the main control CPU; the uplink infrared debugging interface circuit is used for connecting debugging equipment in an infrared mode to debug, maintain and upgrade each meter; the Bluetooth debugging interface circuit of the Bluetooth meter is used for connecting the Bluetooth with each meter and is also used for connecting the Bluetooth with debugging equipment to debug, maintain and upgrade each meter; the 485 meter interface circuit is used for connecting each meter of the 485 interface; the MBUS meter interface circuit is used for connecting each meter of the MBUS bus interface; the local storage module is used for storing the information of each table acquired by the main control CPU to the local for servo uploading; the download interface is used for downloading the information of each table collected by the main control CPU in a local data line mode; the battery power supply interface is used for supplying power to the whole collector; the master control CPU is electrically connected with the uplink NB network interface circuit, the uplink infrared debugging interface circuit, the Bluetooth debugging interface circuit of the Bluetooth meter, the 485 meter interface circuit, the MBUS meter interface circuit, the local storage module and the download interface.

Furthermore, the main control CPU adopts a micro low power consumption CM0+ core MCU, and the chip model of the main control CPU is FM33LC 026N.

Further, the uplink NB network interface circuit includes: an NB module U8, a patch SIM card U9, 0603 packaging patch resistors R68-R84, 0603 packaging patch capacitors C32-C43, a TVS tube D11, an NMOS tube Q13, a patch LED lamp D12 and NPN triodes Q14-Q17; the connection mode of the uplink NB network interface circuit is as follows: capacitors C32-C35 and TVS are connected in parallel, one end of each capacitor is grounded, the other end of each capacitor is connected with a VBAT pin of the NB module U8, a drain electrode of the Q13 is connected with the VBAT pin of the NB module U8, a source electrode of the Q13 is connected with a system power supply VCC, and gate link resistors R68 and R69 of the Q13 control the power supply of the NB module through an NB _ POW pin of the CPU; the SIM card paster SIM card U9 is linked with a SIM card interface of the module NB module U8 through resistors R72-R75, one ends of capacitors C37-C40 are grounded, one ends of the capacitors are connected with

pins

6, 3, 7 and 8 of the paster SIM card U9, one end of a capacitor C36 is connected with pin 1 of the paster SIM card U9, and the other end of the capacitor C36 is connected with pin 8 of the paster SIM card U9; one end of a resistor R79 and a capacitor C42 is connected with a VDD _ EXT pin of the NB module U8, the other end of the resistor R79 and the capacitor C42 is connected with a base electrode of a triode Q16, one end of a resistor R80 is connected with the VDD _ EXT pin of the NB module U8, the other end of the resistor R80 is connected with a collector electrode of the Q16 and an RX pin of the NB module U8, one end of the resistor R81 is connected with an NB _ TX pin of a CPU, and the other end of the resistor R81 is connected with an emitter electrode of the Q16; one ends of a resistor R84 and a capacitor C43 are connected with a VDD _ EXT pin of the NB module U8, the other ends of the resistor R84 and the capacitor C43 are connected with a base electrode of a triode Q17 and a collector electrode of a resistor R83 which are connected with a system voltage VCC, the other ends of the resistor R83 are connected with a collector electrode of a Q17 and an NB _ RX pin of a CPU, one end of the resistor R82 is connected with a TX pin of the NB module U8, and the other end of the resistor R82 is connected with an emitter electrode of the NB 17; the base and the emitter of the triode Q14 are connected with the resistor R70, the emitter of Q14 is grounded, the collector of Q14 is connected with the 15 pin of the NB module U8, and the NB _ RS pin of the CPU is connected with the base of the triode Q14 through R71; the pin 18 of the NB module U8 is connected with the base of a triode Q15 through a resistor R77, the two ends of the base and the emitter of the triode Q15 are connected with a resistor R78, the emitter of Q15 is grounded, the resistors R76 and D12 are connected between the collector of the Q15 and the power supply battery voltage VBAT in series, one end of a capacitor C41 is grounded, and the other end of the capacitor C41 is connected with a VDD _ EXT pin of the NB module U8; j1 is connected with 53 pins of the NB module U8;

Further, the uplink infrared debugging interface circuit includes: an infrared receiving head U2, an infrared transmitting tube D1, a 0603 patch resistor R1, R2, R6, R9, R11, R12, a 0603 patch capacitor C2, C3, a triode Q2 and Q3; the connection mode of the uplink infrared debugging interface circuit is as follows: the 3 pin of the infrared receiving head U2 is connected with the collector of the triode Q2, one end of C2 and one end of R6, the other end of C2 is grounded, the other end of R6 is connected with the 1 pin of the infrared receiving head U2 and one end of R9, and the other end of R9 is connected with the RED _ RXD pin of the CPU; the base electrode of the triode Q2 is connected with one end of the resistors R1 and R2, the other end of the R2 is connected with the RED _ EN pin of the CPU, and the other end of the R1 is connected with the collector electrode of the triode Q2 and a system power VCC; the collector of the triode Q3 is connected with the anode of the D1, the cathode of the D1 is grounded, the base of the triode Q3 is connected with one end of a resistor R12, the other end of the R12 is connected with the RED _ TXD pin of the CPU, the emitter of the triode Q3 is connected with a resistor R11 to a system VCC, one end of the C3 is connected with the system VCC, and the other end of the C3 is grounded;

Further, the bluetooth debugging interface circuit of the bluetooth watch comprises: bluetooth module E92, bluetooth table bluetooth debugging interface circuit's connected mode does: the Bluetooth module E92 is connected with the CPU, a pin 17 of the Bluetooth module E92 is connected with an RED _ TXD pin of the CPU, a pin 18 of the Bluetooth module E92 is connected with an RED _ RXD pin of the CPU, and a pin 23 of the Bluetooth module E92 is connected with a BLE _ EN pin of the CPU;

Further, the 485 meter interface circuit includes: 485 transceiver U1, 0603 patch resistor R3, R4, R5, R7, R8, R10, 0603 patch capacitor C1, PMOS tube Q1 and meter interface P3; the 485 meter interface circuit is connected in the following mode: a pin 1 of a 485 transceiver U1 and one end of an R3 are connected with an RS485_ RX pin of a CPU, the other end of R3 and an 8 pin of the 485 transceiver U1, one end of C1, a source of Q1 and one end of R5 are connected together, the other end of C1 is grounded, the other end of R5 is connected with a pin 7 of the 485 transceiver U1 and a pin 1 of P3, two ends of R8 are respectively connected with a pin 6 and a pin 7 of the 485 transceiver U1 and a pin 1 and a pin 2 of P3, one end of R10 is connected with a pin 6 of the 485 transceiver U1 and a pin 2 of P3, the other end is grounded, one ends of R4 and R7 are connected with a grid of 82Q 1 together, the other end of R4 is connected with a system VCC, and the other end of R7 is connected with an RS _ POW of the CPU;

Further, the MBUS meter interface circuit includes: the MBUS meter interface circuit comprises a BOOST BOOST chip, resistors R3, R6, R9-R12, R14, R22, capacitors C1-C4, C6, C7, C8, a diode D4, an inductor L1 and an MOS tube Q1, and the connection mode of the MBUS meter interface circuit is as follows: a current input end VCC is connected with a source electrode of a MOS tube Q1, a grid electrode of a MOS tube Q1 is connected with a resistor R12, the other end of a resistor R12 is connected with an enable EN, a resistor R11 is further connected between the enable EN and the input current VCC, a drain electrode of the MOS tube Q1 is connected with a capacitor C1, the other end of a capacitor C1 is grounded, a drain electrode of a MOS tube Q1 is connected with a capacitor C2, the other end of the capacitor C2 is grounded, a drain electrode of the MOS tube Q1 is connected with a resistor R10, the other end of the resistor R10 is connected with a pin 2 of the BOOST chip, a drain electrode of the MOS tube Q1 is connected with an inductor L1, the other end of the inductor L1 is respectively connected with

pins

4, 5 and 6 of the BOOST chip and an anode electrode of a diode D4, a cathode electrode of the diode D4 is connected with a resistor R4, the other end of the resistor R4 is connected with a pin 13 of the BOOST chip, a cathode electrode of the diode D4 is connected with a resistor R4, the other end of the resistor R4 is connected with an output end of the circuit, the other end of the diode D4, the cathode of the diode D4 is connected with a capacitor C4, the capacitor C4 is connected with the ground, the negative electrode of the diode D4 is connected with a capacitor C8, the other end of the capacitor C8 is grounded, a pin 1 of the BOOST chip is connected with a resistor R6, the other end of the resistor R6 is connected with a capacitor C3, the other end of the capacitor C3 is grounded, a pin 7 of the BOOST chip is connected with a capacitor C6, the other end of the capacitor C6 is grounded,

pins

8, 9, 10 and 11 of the BOOST chip are grounded, a pin 12 of the BOOST chip is connected with a capacitor C4, the other end of the capacitor C4 is grounded, a pin 13 of the BOOST chip is connected with a resistor R9, the other end of the resistor R9 is grounded, a pin 14 of the BOOST chip is connected with a resistor R13, and the other end of the resistor R13 is grounded; a high-power transistor Q6, a MOS tube Q5, a voltage stabilizing diode D9, a Schottky diode D8, a triode Q7, resistors R34-R39, a capacitor C9 and a capacitor C10; the pin MBUS _ TXD of the master control CPU is connected with a resistor R39, the other end of the resistor R39 is grounded, the pin MBUS _ TXD of the master control CPU is connected with a resistor R36, the other end of the resistor R36 is connected with the base electrode of a triode Q7, the emitter electrode of the triode Q7 is grounded, the collector electrode of the triode Q7 is sequentially connected with a resistor R7 and a resistor R7 in series and then connected with the grid electrode of a MOS tube Q7, a resistor R7 and a resistor R7 are connected between the resistor R7 and the resistor R7, the other end of the resistor R7 is connected with the source electrode of the MOS tube Q7, the other end of the resistor R7 is connected with a resistor R7, the other end of the resistor R7 is connected with the cathode electrode of a Zener diode D7, the cathode electrode of the Zener diode D7 is connected with the ground, the cathode electrode of the capacitor C7 is connected with the ground, the cathode electrode of the Schottky diode D7 is connected with the collector electrode of the high power transistor Q7, the emitter electrode of the Schottky diode Q7 is connected with the collector electrode of the Schottky diode Q7, the anode of the schottky diode D8 is connected to the capacitor C9, the other end of the capacitor C9 is grounded, the drain of the MOS transistor Q5 is connected to VBUS, and one end of R37 and R38, the source of the MOS transistor Q5 and the collector of the high-power transistor Q6 are all connected to the output power supply POW of the power supply circuit;

the MBUS meter interface circuit further comprises: an operational amplifier U1, a comparator U2, diodes D1 and D2, a double diode D3, resistors R1, R2, R4, R5, R7, R8, R13, R15-R21 and a capacitor C5; the MBUS bus is connected with the anode of a diode D1, the cathode of a diode D1 is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the anode of a double diode D3, the cathodes of the double diode D3 are respectively connected with a resistor R5 and a resistor R21 and then connected with a pin 5 and a pin 10 of an operational amplifier U1, the cathodes of the double diode D3 are respectively connected with a resistor R4 and a resistor R20 and then grounded, one end of the cathode of the double diode D3 is connected with a resistor R20 and a capacitor C5, the other end of the capacitor C5 is grounded, a pin 6 of the operational amplifier U5 is connected with a pin 5 of the operational amplifier U5 and then connected with a pin 6857 of the operational amplifier U5, a pin 7 of the operational amplifier U5 is connected with a resistor R5 and then connected with a pin 6858 of the operational amplifier U5, a pin 6 of the operational amplifier U5 is connected with a resistor R5 and then connected with a pin 5 of the operational amplifier U5, pin 8 of an operational amplifier U1 is connected with a resistor R18 and then connected with pin 3 of an operational amplifier U1, pin 3 of the operational amplifier U1 is connected with a resistor R19 and then grounded, pin 2 of an operational amplifier U1 is connected with a resistor R8 and then connected with pin 1 of an operational amplifier U1, pin 4 of the operational amplifier U1 is connected with a power supply POW, pin 11 of the operational amplifier U1 is grounded, pin 2 of the operational amplifier U1 is connected with a resistor R15 and then connected with pin 2 of a comparator U2, pin 3 of the comparator U2 is connected with a resistor R1 and then connected with the power supply POW, pin 3 of the comparator U2 is connected with a resistor R2 and then grounded, pin 4 of the comparator U2 is grounded, pin 8 of the comparator U2 is connected with the power supply POW, and pin 1 of the comparator U2 is connected with an MBUS _ RXD pin of a main control CPU;

the MBUS meter interface circuit further comprises: a gate connection bus of the MOS transistor Q2 passes through a voltage division resistor network TX _ F, and a source electrode and a drain electrode of the MOS transistor Q2 are respectively connected with a cathode of the double diode D3; a comparator U2, MOS transistors Q3, Q4, diodes D5, D6 and D7, and resistors R23, R24 and R29-R33; the MBUS bus is respectively connected with the drain of a MOS tube Q3 and the gate of a MOS tube Q4, the source of the MOS tube Q3 is connected with a sampling circuit R25-R28 and then connected with VBUS, the gate of the MOS tube Q3 is connected with a power supply POW after being connected with a resistor R32, the gate of the MOS tube Q3 is connected with a pin 7 of a comparator U2, a pin 5 of the comparator U2 is connected with a resistor R33 and then connected with a power supply POW, a pin 5 of the comparator U2 is connected with a resistor R31 and then grounded, a pin 6 of the comparator U31 is connected with a resistor R31 and then connected with VBUS, a pin 6 of the comparator U31 is connected with the source of the MOS tube Q31, the drain of the MOS tube Q31 is grounded, the gate of the MOS tube Q31 is connected with the resistor R31 and then connected with the positive pole of the diode D31, the negative pole of the diode D31 is connected with the negative pole of the diode D31, the positive pole of the diode D31 is connected with VBUS 31, the gate of the MOS tube Q31 is connected with the gate of the resistor R31 and the negative pole of the diode TXF 31 is connected with the negative pole of the OLF 31 and the diode 31 is connected with the negative pole of the OLF 31; the resistors R25-R28, the connection mode of the sampling circuit is as follows: one end of each resistor R25-R28 is connected with the source electrode of the MOS transistor Q3 after being connected in series, and the other end is connected with VBUS;

In summary, the utility model realizes data acquisition of meters with various interface types in different scenes by communicating meters with various different communication interfaces through the master control CPU, uploading the meters to the server through the NB network, and downloading instruction information issued by the server to the master control CPU, solves the problem that the meters with various interface types are only suitable for large-scale centralized data acquisition occasions with single interface type water and electricity meters, and breaks through the cost performance limit of using a centralized data acquisition unit when the management number exceeds thousands of water meters. Therefore, the utility model overcomes the defects of the prior art and has good application prospect.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A lightweight collector of a battery-powered multi-meter interface is characterized by comprising a master control CPU, an uplink NB network interface circuit, an uplink infrared debugging interface circuit, a Bluetooth meter Bluetooth debugging interface circuit, a 485 meter interface circuit, an MBUS meter interface circuit, a local storage module, a download interface and a battery-powered interface;

the main control CPU is used as a core processing unit to provide circuit connection and data processing for each module and circuit;

the uplink NB network interface circuit is used for uploading the data of each table collected by the main control CPU to a server through an NB network and downloading the instruction information issued by the server to the main control CPU;

the uplink infrared debugging interface circuit is used for connecting debugging equipment in an infrared mode to debug, maintain and upgrade each meter;

the Bluetooth debugging interface circuit of the Bluetooth meter is used for connecting the Bluetooth with each meter, and is also used for connecting a debugging device with the Bluetooth to debug, maintain and upgrade each meter;

the 485 meter interface circuit is used for connecting each meter of the 485 interface;

the MBUS meter interface circuit is used for connecting each meter of the MBUS bus interface;

the local storage module is used for storing the information of each table acquired by the main control CPU to the local for servo uploading;

the download interface is used for downloading the information of each table acquired by the main control CPU in a local data line mode;

the battery power supply interface is used for supplying power to the whole collector;

the master control CPU is electrically connected with the uplink NB network interface circuit, the uplink infrared debugging interface circuit, the Bluetooth meter Bluetooth debugging interface circuit, the 485 meter interface circuit, the MBUS meter interface circuit, the local storage module and the download interface.

2. The light-weight collector of a battery-powered multi-meter interface according to claim 1, wherein the main control CPU adopts a micro low power consumption CM0+ kernel MCU, and the chip model of the main control CPU is FM33LC 026N.

3. The lightweight collector of battery-powered multimeter interface of claim 1, wherein the uplink NB network interface circuit comprises: an NB module U8, a patch SIM card U9, 0603 packaging patch resistors R68-R84, 0603 packaging patch capacitors C32-C43, a TVS tube D11, an NMOS tube Q13, a patch LED lamp D12 and NPN triodes Q14-Q17; the connection mode of the uplink NB network interface circuit is as follows: capacitors C32-C35 and TVS are connected in parallel, one end of each capacitor is grounded, the other end of each capacitor is connected with a VBAT pin of the NB module U8, a drain electrode of the Q13 is connected with the VBAT pin of the NB module U8, a source electrode of the Q13 is connected with a system power supply VCC, and gate link resistors R68 and R69 of the Q13 control the power supply of the NB module through an NB _ POW pin of the CPU; the SIM card paster SIM card U9 is linked with a SIM card interface of the module NB module U8 through resistors R72-R75, one ends of capacitors C37-C40 are grounded, one ends of the capacitors are connected with pins 6, 3, 7 and 8 of the paster SIM card U9, one end of a capacitor C36 is connected with pin 1 of the paster SIM card U9, and the other end of the capacitor C36 is connected with pin 8 of the paster SIM card U9; one end of a resistor R79 and a capacitor C42 is connected with a VDD _ EXT pin of the NB module U8, the other end of the resistor R79 and the capacitor C42 is connected with a base electrode of a triode Q16, one end of a resistor R80 is connected with the VDD _ EXT pin of the NB module U8, the other end of the resistor R80 is connected with a collector electrode of the Q16 and an RX pin of the NB module U8, one end of the resistor R81 is connected with an NB _ TX pin of a CPU, and the other end of the resistor R81 is connected with an emitter electrode of the Q16; one ends of a resistor R84 and a capacitor C43 are connected with a VDD _ EXT pin of the NB module U8, the other ends of the resistor R84 and the capacitor C43 are connected with a base electrode of a triode Q17 and a collector electrode of a resistor R83 which are connected with a system voltage VCC, the other ends of the resistor R83 are connected with a collector electrode of a Q17 and an NB _ RX pin of a CPU, one end of the resistor R82 is connected with a TX pin of the NB module U8, and the other end of the resistor R82 is connected with an emitter electrode of the NB 17; the base and the two ends of the emitter of the triode Q14 are connected with the resistor R70, the emitter of Q14 is grounded, the collector of Q14 is connected with the 15 pin of the NB module U8, and the NB _ RS pin of the CPU is connected with the base of the triode Q14 through R71; the pin 18 of the NB module U8 is connected with the base of a triode Q15 through a resistor R77, the two ends of the base and the emitter of the triode Q15 are connected with a resistor R78, the emitter of Q15 is grounded, the resistors R76 and D12 are connected between the collector of the Q15 and the power supply battery voltage VBAT in series, one end of a capacitor C41 is grounded, and the other end of the capacitor C41 is connected with a VDD _ EXT pin of the NB module U8; j1 connects the 53 pins of NB module U8.

4. The lightweight collector of battery-powered multimeter interface of claim 1, wherein the uplink infrared debug interface circuit comprises: the infrared receiving head U2, the infrared transmitting tube D1, 0603 patch resistors R1, R2, R6, R9, R11, R12, 0603 patch capacitors C2, C3, a triode Q2 and Q3; the connection mode of the uplink infrared debugging interface circuit is as follows: the 3 pin of the infrared receiving head U2 is connected with the collector of the triode Q2, one end of C2 and one end of R6, the other end of C2 is grounded, the other end of R6 is connected with the 1 pin of the infrared receiving head U2 and one end of R9, and the other end of R9 is connected with the RED _ RXD pin of the CPU; the base electrode of the triode Q2 is connected with one end of the resistors R1 and R2, the other end of the R2 is connected with the RED _ EN pin of the CPU, and the other end of the R1 is connected with the collector electrode of the triode Q2 and a system power VCC; the collector of the triode Q3 is connected with the anode of the D1, the cathode of the D1 is grounded, the base of the triode Q3 is connected with one end of a resistor R12, the other end of the R12 is connected with the RED _ TXD pin of the CPU, the emitter of the triode Q3 is connected with a resistor R11 to a system VCC, one end of the C3 is connected with the system VCC, and the other end of the C3 is grounded.

5. The lightweight collector of battery-powered multi-meter interface of claim 1, wherein the bluetooth debug interface circuit of the bluetooth meter comprises: bluetooth module E92, bluetooth table bluetooth debugging interface circuit's connected mode does: the Bluetooth module E92 is connected with the CPU, the 17 pin of the Bluetooth module E92 is connected with the RED _ TXD pin of the CPU, the 18 pin is connected with the RED _ RXD pin of the CPU, and the 23 pin is connected with the BLE _ EN pin of the CPU.

6. The lightweight collector of battery-powered multimeter interface of claim 1, wherein the 485-meter interface circuit comprises: 485 transceiver U1, 0603 patch resistor R3, R4, R5, R7, R8, R10, 0603 patch capacitor C1, PMOS tube Q1 and meter interface P3; the 485 meter interface circuit is connected in the following mode: pin 1 of 485 transceiver U1 and one end of R3 are connected with RS485_ RX pin of CPU, the other end of R3 and pin 8 of 485 transceiver U1, one end of C1, source of Q1 and one end of R5 are connected together, the other end of C1 is grounded, the other end of R5 is connected with pin 7 of 485 transceiver U1 and pin 1 of P3, the two ends of R8 are respectively connected with pin 6 and pin 7 of 485 transceiver U1 and pin 1 and pin 2 of P3, one end of R10 is connected with pin 6 of 485 transceiver U1 and pin 2 of P3, the other end is grounded, one ends of R4 and R7 are connected with grid of 82Q 1, the other end of R4 is connected with system VCC, and the other end of R7 is connected with RS _ POW of CPU.

7. The lightweight collector of battery-powered multi-meter interface of claim 1, wherein the MBUS meter interface circuit comprises: the MBUS meter interface circuit comprises a BOOST BOOST chip, resistors R3, R6, R9-R12, R14, R22, capacitors C1-C4, C6, C7, C8, a diode D4, an inductor L1 and an MOS tube Q1, and the connection mode of the MBUS meter interface circuit is as follows: a current input end VCC is connected with a source electrode of a MOS tube Q1, a grid electrode of a MOS tube Q1 is connected with a resistor R12, the other end of a resistor R12 is connected with an enable EN, a resistor R11 is further connected between the enable EN and the input current VCC, a drain electrode of the MOS tube Q1 is connected with a capacitor C1, the other end of a capacitor C1 is grounded, a drain electrode of a MOS tube Q1 is connected with a capacitor C2, the other end of the capacitor C2 is grounded, a drain electrode of the MOS tube Q1 is connected with a resistor R10, the other end of the resistor R10 is connected with a pin 2 of the BOOST chip, a drain electrode of the MOS tube Q1 is connected with an inductor L1, the other end of the inductor L1 is respectively connected with pins 4, 5 and 6 of the BOOST chip and an anode electrode of a diode D4, a cathode electrode of the diode D4 is connected with a resistor R4, the other end of the resistor R4 is connected with a pin 13 of the BOOST chip, a cathode electrode of the diode D4 is connected with a resistor R4, the other end of the resistor R4 is connected with an output end of the circuit, the other end of the diode D4, the cathode of the diode D4 is connected with a capacitor C4, the capacitor C4 is connected with the ground, the negative electrode of the diode D4 is connected with a capacitor C8, the other end of the capacitor C8 is grounded, a pin 1 of the BOOST BOOST chip is connected with a resistor R6, the other end of the resistor R6 is connected with a capacitor C3, the other end of the capacitor C3 is grounded, a pin 7 of the BOOST BOOST chip is connected with a capacitor C6, the other end of the capacitor C6 is grounded, pins 8, 9, 10 and 11 of the BOOST BOOST chip are grounded, a pin 12 of the BOOST BOOST chip is connected with a capacitor C4, the other end of the capacitor C4 is grounded, a pin 13 of the BOOST BOOST chip is connected with a resistor R9, the other end of the resistor R9 is grounded, a pin 14 of the BOOST BOOST chip is connected with a resistor R13, and the other end of the resistor R13 is grounded; a high-power transistor Q6, a MOS tube Q5, a voltage stabilizing diode D9, a Schottky diode D8, a triode Q7, resistors R34-R39, a capacitor C9 and a capacitor C10; the pin MBUS _ TXD of the master control CPU is connected with a resistor R39, the other end of the resistor R39 is grounded, the pin MBUS _ TXD of the master control CPU is connected with a resistor R36, the other end of the resistor R36 is connected with the base electrode of a triode Q7, the emitter electrode of the triode Q7 is grounded, the collector electrode of the triode Q7 is sequentially connected with a resistor R7 and a resistor R7 in series and then connected with the grid electrode of a MOS tube Q7, a resistor R7 and a resistor R7 are connected between the resistor R7 and the resistor R7, the other end of the resistor R7 is connected with the source electrode of the MOS tube Q7, the other end of the resistor R7 is connected with a resistor R7, the other end of the resistor R7 is connected with the cathode electrode of a Zener diode D7, the cathode electrode of the Zener diode D7 is connected with the ground, the cathode electrode of the capacitor C7 is connected with the ground, the cathode electrode of the Schottky diode D7 is connected with the collector electrode of the high power transistor Q7, the emitter electrode of the Schottky diode Q7 is connected with the collector electrode of the Schottky diode Q7, the anode of the schottky diode D8 is connected to the capacitor C9, the other end of the capacitor C9 is grounded, the drain of the MOS transistor Q5 is connected to VBUS, and one end of R37 and R38, the source of the MOS transistor Q5 and the collector of the high-power transistor Q6 are all connected to the output power supply POW of the power supply circuit;

the MBUS meter interface circuit further comprises: a gate connection bus of the MOS transistor Q2 passes through a voltage division resistor network TX _ F, and a source electrode and a drain electrode of the MOS transistor Q2 are respectively connected with a cathode of the double diode D3; a comparator U2, MOS transistors Q3, Q4, diodes D5, D6 and D7, and resistors R23, R24 and R29-R33; the MBUS bus is respectively connected with the drain of a MOS tube Q3 and the gate of a MOS tube Q4, the source of the MOS tube Q3 is connected with a sampling circuit R25-R28 and then is connected with VBUS, the gate of the MOS tube Q3 is connected with a power supply POW after being connected with a resistor R32, the gate of the MOS tube Q3 is connected with a pin 7 of a comparator U2, a pin 5 of the comparator U2 is connected with a resistor R33 and then is connected with a power supply POW, a pin 5 of the comparator U2 is connected with a resistor R31 and then is grounded, a pin 6 of the comparator U31 is connected with a resistor R31 and then is connected with VBUS, a pin 6 of the comparator U31 is connected with the source of a MOS tube Q31, the drain of the MOS tube Q31 is grounded, the gate of the MOS tube Q31 is connected with a resistor R31 and then is connected with the anode of a diode D31, the cathode of the diode D31 is connected with a diode D31, the anode of the diode D31 is connected with a diode TXF 31 and the anode of the diode OLF 31 is connected with the diode 31 and the diode TXF 31 and the cathode of the diode is connected with the diode OLF 31; the resistors R25-R28, the connection mode of the sampling circuit is as follows: one end of each of the resistors R25-R28 is connected with the source electrode of the MOS transistor Q3 after being connected in series, and the other end is connected with VBUS.