CN216649530U

CN216649530U - Information acquisition remote communication terminal

Info

Publication number: CN216649530U
Application number: CN202123019243.4U
Authority: CN
Inventors: 杨雄; 吴星; 杨俊�
Original assignee: Chengdu Hualida Information Technology Co ltd
Current assignee: Chengdu Hualida Information Technology Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-05-31
Anticipated expiration: 2031-12-03

Abstract

The utility model discloses an information acquisition remote communication terminal which comprises a shell for packaging, a first PCB and a second PCB, wherein the first PCB and the second PCB are arranged in the shell and are connected through corresponding interfaces, the first PCB is loaded with a switching power supply module and a clock circuit unit, and the second PCB is loaded with a main chip circuit, a communication module, a 485 circuit and a power supply conversion circuit. The utility model skillfully carries out structure simplification and miniaturization design on the communication part of the acquisition terminal, enables the structure size of the terminal to better meet the realization requirement of field assembly on the basis of keeping necessary functions, greatly improves the convenience of installation in each electric power cabinet and cabinet, and improves the stability of terminal operation through the design of power supply of the switching power supply.

Description

Information acquisition remote communication terminal

Technical Field

The utility model relates to a communication circuit module design technology, in particular to an information acquisition remote communication terminal.

Background

With the development of science and technology, the operation of various equipment devices can not be separated from the use of electric power. The collection and monitoring of the electricity consumption information are important components of the operation and management of the power grid. At present, corresponding acquisition terminals are generally configured at appropriate point positions of power utilization terminals to acquire relevant power utilization information, but the currently adopted terminal structure is huge and heavy, so that the production, manufacturing and maintenance costs are very high, and the actual requirements of a field cannot be met when some relatively narrow installation and application spaces are faced. Thus, improvements are needed.

SUMMERY OF THE UTILITY MODEL

In view of the above problems in the prior art, the present invention provides a miniaturized information-collecting remote communication terminal with complete basic functions and simplified structure, so as to meet the requirements of specific practical application scenarios.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

an information acquisition remote communication terminal comprises a shell for packaging, a first PCB and a second PCB, wherein the first PCB and the second PCB are arranged in the shell and are connected through corresponding interfaces; the switch power supply module is connected with an alternating current input, converts the alternating current input into direct current and outputs the direct current to the clock circuit unit and the power supply conversion circuit; the clock circuit unit is powered by the switch power supply module and communicates with the main chip circuit to calibrate time so as to provide standard time timing; the power supply conversion circuit is used for converting direct current power supply of the switching power supply module into direct current voltage required by the main chip circuit, the communication module and the 485 circuit; the 485 circuit is used for acquiring external ammeter data, converting the external ammeter data into corresponding differential signals and then sending the differential signals to a remote place through the main chip circuit and the communication module; the main chip circuit is used for processing communication data; and the communication module is used for sending the collected and processed data to a remote end.

Specifically, the second PCB is provided with an LED indicating circuit for displaying a color corresponding to the operating state of the terminal on the housing.

Specifically, the switching power supply module comprises a voltage dependent resistor RV1 connected between an ac live wire inlet end L and an ac neutral wire inlet end N, a fuse tube F1 with one end connected to the ac live wire inlet end L, a protection resistor R1 with one end connected to the other end of the fuse tube F1 and the other end connected to the ac neutral wire inlet end N, a safety capacitor C1 connected in parallel with the protection resistor R1, an inductor L1 and an inductor L2 connected to both ends of the safety capacitor C1, a bridge core piece U1 with the inlet end connected to the inductor L1 and the other end of the inductor L2, a thermistor RT1 connected to a positive output end of the bridge core piece U1, an electrolytic capacitor C3 with one end connected to a negative output end of the bridge core piece U1 and the other end of the thermistor RT1, and a high-frequency switching unit connected to both ends of the electrolytic capacitor C3 and switching the high-frequency switching unit outputs a dc.

Specifically, the high-frequency switch conversion unit comprises a high-frequency switch chip IC1 with a model number of TOPSWITCH224 and a high-frequency transformer T1, wherein one end of a primary power supply end of the high-frequency transformer T1 is connected with the anode of an electrolytic capacitor C3, the other end of the primary power supply end of the high-frequency transformer T1 is connected with a DRAIN pin of the high-frequency switch chip IC1, a primary feedback end of the high-frequency transformer T1 is connected with a SOURCE pin of the high-frequency switch chip IC1 through a diode D3, a capacitor C3 and a capacitor C4 and is grounded through a capacitor C8, the secondary end of the high-frequency transformer T1 is connected with a secondary filter unit, the SOURCE pin of the high-frequency switch chip IC1 is connected with the cathode of the electrolytic capacitor C3, and a CONTROL pin of the high-frequency switch chip IC1 is connected with the secondary filter unit through a sampling circuit.

Specifically, the sampling circuit comprises a capacitor C5 connected between a SOURCE pin and a CONTROL pin of a high-frequency switch chip IC1, a capacitor C6 and a capacitor C7 which are connected with the CONTROL pin of a high-frequency switch chip IC1 at one end and grounded at the other end after being connected in parallel, an optical coupler N1 of which the output end is respectively connected with the CONTROL pin of a high-frequency switch chip IC1 and a primary feedback end of a high-frequency transformer T1, a resistor R3 and a resistor R4 which are connected between the input ends of the optical coupler N1, a diode D5 of which the cathode is connected with one input end of the optical coupler N1, a resistor R2 and a capacitor C9 which are connected in parallel with the diode D5 after being connected in series, and a resistor R6 and a resistor R7 which are connected with the anode of the diode D5 at one end and the other end of the diode D6 and a secondary filter unit after being connected in series, wherein the resistor R7 is further grounded through a resistor R5, and a resistor R3 is further connected with the secondary filter unit.

Specifically, the second-stage filtering unit includes a diode D4, an inductor L4, an electrolytic capacitor C4, a resistor R4 and a resistor R4, wherein a positive electrode of the diode D4 is connected to the positive output terminal of the secondary side of the high-frequency transformer T4, a negative electrode of the diode D4 is connected to one end of the electrolytic capacitor C4, the other end of the electrolytic capacitor D4 is connected to the negative electrode of the high-frequency transformer T4, the other end of the capacitor C4 is connected to the negative electrode of the diode D4, one end of the capacitor C4 is connected to the ground, the capacitor C4 and the resistor R4 are both connected in parallel with the capacitor C4, the inductor L4 and the inductor L4 are connected to both ends of the resistor R4, the other end of the inductor L4 is connected to the ground, one end of the resistor R4 is connected to one end of the inductor L4 and the inductor L4 is connected to the other end of the inductor L4 and the diode D4, and the resistor R4 is connected to the ground, one end of the diode is connected as a transient dc power supply output, and the TVS 4.

Specifically, the clock circuit unit comprises a clock chip IC2, a resistor R11 with one end connected with 3.3V power supply and the other end connected with an SCL pin of a clock chip IC2, a resistor R12 with one end connected with 3.3V power supply and the other end connected with an SDA pin of a clock chip IC2, diodes D6, D7, D8 and D9 which are sequentially connected in series and then have the positive electrodes connected with 5V power supply, a resistor R15 with one end connected with the negative electrode of the diode D9 and the other end connected with a VDD pin of the clock chip IC2, and a diode D10 with the positive electrode connected with a battery BT1 and the negative electrode connected with a resistor R15, wherein the SCL pin and the SDA pin of the clock chip IC2 are both communicated with a main chip circuit.

Specifically, the power conversion circuit comprises a first power conversion circuit for supplying power to the 485 circuit and the main chip circuit and a second power conversion circuit for supplying power to the communication module; the first power conversion circuit comprises a voltage stabilizing chip IC3, and a capacitor C16, a capacitor C17, a capacitor C18 and a transient diode TVS2 which are connected with a voltage stabilizing chip IC 3; the second power conversion circuit comprises a voltage stabilizing chip IC4, and resistors R17, R18 and R19 and capacitors C20, C21, C22 and C23 which are connected with the voltage stabilizing chip IC 4.

Specifically, the 485 circuit comprises a conversion chip IC5, a resistor R26 with one end connected with a 5V power supply and the other end connected with an RO pin of a conversion chip IC5, a resistor R27 and a resistor R28 with one end connected with the RO pin of the conversion chip IC5 and the other end grounded after being sequentially connected in series, a resistor R25 with one end connected with the 5V power supply and the other end connected with RE and DE pins of a conversion chip IC5, a triode Q2 with a collector connected with the RE and DE pins of the conversion chip IC5 and an emitter connected with a GND pin of the conversion chip IC5, a resistor R25 with one end connected with a DI pin of the conversion chip IC5 and the other end connected with a base of a triode Q3, a resistor R9 with one end connected with a DI pin of the conversion chip IC5 and the other end connected with a main chip circuit R9, a resistor R29 with one end connected with an A pin of the conversion chip IC5 and the other end output as a path of a differential signal 485A, a resistor R29 and the other end connected in parallel and a resistor R30 and a TVS3 with the other end connected with the other end supplied with a 5V power supply, a resistor R31 which is connected with the B pin of the conversion chip IC5 in a terminating way and the other end of which is used as the output of another differential signal 485B, a resistor R32 and a transient diode TVS4 which are connected with the other end of the resistor R31 in a parallel way and the other end of which is grounded, and a transient diode TVS5 which is connected between the two differential signals, wherein the Vcc pin of the conversion chip IC5 is connected with 5V power supply and is grounded through a capacitor C24.

Specifically, the main chip circuit adopts an STM32 single chip circuit, and the communication module adopts a 4G communication module with the model number of N58.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model skillfully carries out structure simplification and miniaturization design on the communication part of the acquisition terminal, enables the structure size of the terminal to better meet the realization requirement of field assembly on the basis of keeping necessary functions, greatly improves the convenience of installation in each electric power cabinet and cabinet, and improves the stability of terminal operation through the design of power supply of the switching power supply. The utility model has the advantages of ingenious design, simple structure, convenient use and low cost, and is suitable for being applied to the communication of the acquisition terminal.

Drawings

FIG. 1 is a schematic block diagram of an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a switching power supply module according to an embodiment of the utility model.

Fig. 3 is a schematic circuit diagram of a clock circuit unit according to an embodiment of the present invention.

Fig. 4 is a circuit schematic of the first interface in an embodiment of the utility model.

Fig. 5 is a schematic circuit diagram of a first power conversion circuit according to an embodiment of the utility model.

Fig. 6 is a schematic circuit diagram of a second power conversion circuit according to an embodiment of the present invention.

Fig. 7 is a schematic circuit diagram of a 485 circuit unit in an embodiment of the utility model.

Detailed Description

The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.

Examples

As shown in fig. 1to 7, the information acquisition remote communication terminal includes a housing for packaging, and a first PCB and a second PCB which are disposed in the housing and connected through corresponding interfaces, wherein the first PCB carries a switching power supply module and a clock circuit unit, and the second PCB carries a main chip circuit, a communication module, a 485 circuit and a power conversion circuit; the switch power supply module is connected with an alternating current input, converts the alternating current input into direct current and outputs the direct current to the clock circuit unit and the power supply conversion circuit; the clock circuit unit is powered by the switch power supply module and communicates with the main chip circuit to calibrate time so as to provide standard time timing; the power supply conversion circuit is used for converting direct current power supply of the switching power supply module into direct current voltage required by the main chip circuit, the communication module and the 485 circuit; the 485 circuit is used for acquiring external ammeter data, converting the external ammeter data into corresponding differential signals and then sending the differential signals to a remote place through the main chip circuit and the communication module; the main chip circuit is used for processing communication data; and the communication module is used for sending the collected and processed data to a remote end.

Specifically, the switching power supply module comprises a voltage dependent resistor RV1 connected between an ac live wire inlet end L and an ac neutral wire inlet end N, a fuse tube F1 with one end connected to the ac live wire inlet end L, a protection resistor R1 with one end connected to the other end of the fuse tube F1 and the other end connected to the ac neutral wire inlet end N, a safety capacitor C1 connected in parallel with the protection resistor R1, an inductor L1 and an inductor L2 connected to two ends of the safety capacitor C1 respectively, a bridge core plate U1 with an inlet end connected to the other ends of the inductor L1 and the inductor L2, a thermistor RT1 connected to a positive output end of the bridge core plate U1, an electrolytic capacitor C3 with one end connected to a negative output end of the bridge core plate U1 and the other end connected to the other end of the thermistor RT1, and a high-frequency switch conversion unit connected to two ends of the electrolytic capacitor C3 and converting and outputting a dc.

Specifically, the second-stage filtering unit includes a diode D4, an inductor L4, an electrolytic capacitor C4, a resistor R4 and a resistor R4, the positive electrode of the diode D4 is connected to the positive output terminal of the secondary side of the high-frequency transformer T4, one end of the electrolytic capacitor C4 is connected to the negative electrode of the diode D4, the other end of the electrolytic capacitor C4 is connected to the negative output terminal of the secondary side of the high-frequency transformer T4 and grounded, the capacitor C4 is connected to the negative output terminal of the secondary side of the high-frequency transformer T4 in parallel, one end of the inductor L4 is connected to the negative electrode of the diode D4, one end of the capacitor C4 is connected to the other end of the inductor L4 and grounded, the capacitors C4 and R4 are both connected to the capacitor C4 in parallel, the inductor L4 and the two ends of the resistor R4 are connected to the two ends of the resistor R4, the diode D4 and grounded, one end of the transient dc diode s4 is connected to the ground.

Specifically, the 485 circuit comprises a conversion chip IC5, a resistor R26 with one end connected with 5V power supply and the other end connected with an RO pin of the conversion chip IC5, a resistor R27 and a resistor R28 which are sequentially connected in series and then have one end connected with the RO pin of the conversion chip IC5 and the other end connected with ground, a resistor R25 with one end connected with 5V power supply and the other end connected with an RE pin and a DE pin of the conversion chip IC5, a triode Q2 with a collector connected with the RE pin and the DE pin of the conversion chip IC5 and an emitter connected with a GND pin of the conversion chip IC5, a resistor R25 with one end connected with a DI pin of the conversion chip IC5 and the other end connected with a base of a triode Q3, a resistor R29 with one end connected with a DI pin of the conversion chip IC5 and the other end connected with a resistor R9 of a main chip circuit, a resistor R29 with one end connected with an A pin of the conversion chip IC5 and the other end connected with a differential signal A output as a 485A after being connected in parallel and the other end connected with a resistor R29 and a resistor R30 and a transient diode 3 with 5V power supply, a resistor R31 which is connected with the B pin of the conversion chip IC5 in a terminating way and the other end of which is used as the output of another differential signal 485B, a resistor R32 and a transient diode TVS4 which are connected with the other end of the resistor R31 in a parallel way and the other end of which is grounded, and a transient diode TVS5 which is connected between the two differential signals, wherein the Vcc pin of the conversion chip IC5 is connected with 5V power supply and is grounded through a capacitor C24.

The working process of the utility model is as follows:

the first PCB board comprises a switching power supply and a clock circuit, the design of a switching power supply scheme is adopted for reducing the size space and the weight, a simple overvoltage, overcurrent protection and EMI anti-interference circuit is adopted at the front end of the AC input of the switching power supply, the AC 220V input firstly passes through a pressure sensitive circuit, a fuse tube and the EMI circuit, a piezoresistor VR 120D 681K is adopted for absorbing lightning surge, a glass fuse tube F1 T1.0A/250V prevents the overcurrent fusing protection of a rear-stage circuit, the EMI is subjected to differential mode and common mode filtering consisting of an ampere capacitor C10.047uF/330V, a magnetic bead L1 and L2(CLH1608T-22NJ-S), and then rectification filtering of a bridge rectifier U1 LB10S and a high-voltage electrolytic capacitor C210 uF/400V is carried out after protection and interference resistance, wherein RT 122 NTC is the current limiting effect of instantaneous large current formed by charging the electrolytic capacitor C2 at the moment of electrification, so as to form the direct-current high-voltage 300V power switching power supply circuit, the high-frequency power supply is mainly supplied to a high-frequency switch chip IC1TOPSWITCH221Y through a high-frequency transformer primary, oscillation pulses are generated in a switch chip, a switch tube conducts the transformer primary to store energy, meanwhile, an induced voltage at a primary end is fed back to the switch chip by a transformer bias stage, the pulse width duty ratio of the oscillation pulses is controlled by the transformer bias stage to facilitate output control, as a flyback mode is adopted, when the switch tube is switched off, a primary coil releases energy, a secondary induced voltage is rectified and filtered through a Schottky diode D4 FMB-29L and a filter capacitor C10470 UF/35V to be output, in order to reduce ripples and noises, a rear stage adopts pi-type filtering, a comparison control circuit is formed by C110.1UF, an inductor L33.3UH 6.5.5A and a capacitor C12330 UF/25V to filter, and output 5.0V direct current voltage to be supplied to a load, a comparator D5 TL431, an optical coupler N1 NEC2501, a sampling resistor R60, an R710K and an R510 ohm 510K are adopted, and the direct current voltage output to the load by the switch power supply to 5.0V to the load is sampled, compared with 2.5V reference voltage in D5 TL431, the error voltage signal is optically coupled and isolated and sent to the bias stage of the switch power supply, the voltage value at the moment is sent to the switch chip for processing, the duty ratio of the pulse width is adjusted after the internal processing of the switch chip, namely, the stored energy of the primary part of the high-frequency transformer is adjusted, so that the voltage sensed by the secondary part also changes correspondingly, and finally the required direct-current power supply value is achieved.

The clock circuit is composed of a clock chip IC2 RX-8025T and peripheral resistance-capacitance devices, after power-on, the clock chip IC2 RX-8025T communicates with the mainboard chip through the 2 nd pin SCL and the 13 th pin SDA of the clock chip IC2 RX-8025T, current corresponding standard time is set, and simultaneously current time is read and checked, the clock chip RX-8025T is provided with temperature compensation, an internal clock is affected by external environment temperature to automatically adjust clock frequency, so that a time value with small error is realized, in addition, under the condition of power failure, power is supplied by a nearby 3.6V lithium battery, the power is supplied to the clock chip through a diode D10 LL4148, at ordinary times, 5.0V of power voltage is reduced through D6-D9 LL4148 (the voltage value after voltage reduction is larger than the voltage value after voltage reduction of the battery), the clock chip works normally and keeps the normal time value, and the voltage of the clock chip is supplied by the battery under the condition of power failure, the method mainly keeps the clock inside the clock chip to normally oscillate and time.

The reference dc voltage and the clock time data generated by the switching power supply are transmitted to the main circuit board through the dual pin array CON1, so as to supply power and provide time information to the main circuit board.

The second PCB board comprises a main chip circuit, two 485 circuits, a power supply conversion circuit, a SIM card interface circuit, an infrared and storage circuit and an indicator light circuit part. The main chip is packaged in an STM32F 02048 PIN flat mode, a 32-bit microprocessor and an embedded chip, the number of internal integrated asynchronous communication ports and common IO ports meets the actual requirement, the working voltage is 3.3V, the oscillation frequency is 8MHZ, and the chip belongs to a low-power consumption type working state, the main chip is provided with 4 paths of asynchronous ports which respectively correspond to 10 th, 11 th PINs USART4TX/RX, 12 th, 13 th PINs USART2TX/RX, 21 st, 22 th PINs UART3TX/RX, 29 th, 30 th PINs UART1TX/RX, respectively correspond to a 4G communication module, infrared communication, 485II communication and 485I communication, the 25 th and 26 th PINs of the common IO ports simulate serial CLK and SDA to be communicated with a clock chip of a power panel, and the 15 th to 18 th PINs are the common IO ports of the main chip and respectively simulate MOSI, CLK, MISO and CS signals corresponding to an SPI mode, and are communicated with an external FLASH serial chip to store data information. And the 28 th pin, the 27 th pin and the 33 rd pin are used as common IO ports to drive external indicator lamps and are used as terminal working state indication. Pins 40 to 43 and 46 as common IO ports respectively correspond to PWRKEY, RESET, STATE1, STATE0 and POWEROFF, and are connected and communicated with corresponding pins of the N58 module.

The power supply conversion circuit is connected with a voltage stabilizing circuit consisting of a main voltage of 5.0V from a power panel interface, a second power supply conversion circuit is connected with a voltage stabilizing circuit consisting of an IC4 MIC29302BT-4.0V voltage stabilizing chip and peripheral related resistance-capacitance components, the voltage of 5.0V is converted into a voltage of 3.8V for supplying power to the N58 communication module, wherein R18110K and R1947K are sampling resistors, and the adjustment effect of required output voltage is realized. The resistors R201K and Q19014 form a control circuit, and when the N58 module is not used, the control circuit is controlled by a 46 th pin GPRSPOFOFOFOFOFOFFF of the main chip, the power voltage of the N58 module is not output at a high level, and the power voltage is output at a low level. The other path of the first power supply conversion circuit is filtered to the IC 31117-3.3 voltage stabilizing chip through C160.1UF to generate stable 3.3V voltage, and is filtered through C170.1UF and a C18220 UF/16V capacitor to form direct current voltage with small stable ripple, and is connected with a transient suppression diode TVS2SMB5.0CA to perform instantaneous high-voltage suppression to protect the main chip from high-voltage damage.

Two 485 circuits mainly collect external electric meter data or related 485 interface device information, because the two circuits are the same, only one circuit is introduced, asynchronous communication information TX sent by a main chip is sent to a resistor R24200 for current limiting, the other circuit is sent to a DI pin data receiving port of a 485 conversion chip IC5 ISL3152, the other circuit is sent to a base electrode of a control triode Q29014 through a resistor R251K, a resistor R2510K is pulled to a power supply voltage 5V end by a triode collector electrode, the triode collector electrode is used as an RE pin and a DE pin output to a conversion chip IC5 for controlling the data flow direction, the low level is receiving (level converter receiving), the high level is sending, the control level is controlled according to the high level and the low level of sending data, when the data is high level, the RE pin and the DE pin of the conversion chip are inverted into the low level by Q2, the converter is in a receiving state, but simultaneously, the DI pin receiving level of the converter chip is high level, the differential output of the converter is high level, when asynchronous communication information is transmitted to low level, the DI received by the conversion chip is low level, the control end is inverted to high level (transmission state) through low level, the output difference of the conversion chip is low level, the chip adopts ISL3152, the chip belongs to half-duplex state, the receiving and the transmitting are time division multiplexing, the rate can reach 0.1Mbps, the requirement of information transmission rate is met, the conversion chip is in differential output mode, the data can be transmitted remotely, the anti-interference capability is strong, R2910 and R3110 are current limiting resistors, R301K and R321K are pulled up and down, the driving power supply end is used, TVS 3-TVS 5 are transient suppression diodes SMB6.5CA, and the transient suppression diodes are used for absorbing the influence of transient high voltage (such as static electricity) on the conversion level chip. The main chip converts the information level into a differential signal through a 485 circuit so as to facilitate long-distance, stable and reliable information transmission.

The infrared circuit is mainly used for field instruction setting, data query and the like, and is composed of an infrared receiving head IC HS0038B and a peripheral resistance-capacitance circuit, wherein the infrared receiving head mainly receives data information sent by an infrared sending head of a palm machine or other equipment. The indicating lamp is a concrete representation of the state of the terminal, a green operation lamp is used for indicating whether the terminal normally operates and comprises a green light emitting diode and a corresponding resistor, an uplink red lamp comprises a red light emitting diode and a corresponding resistor and indicates whether the terminal normally operates towards the 4G far-end communication state, a downlink green lamp comprises a green light emitting diode and a corresponding resistor and indicates whether the terminal normally reads data from the ammeter, and a network indicating lamp green comprises a green light emitting diode, a corresponding resistor and a triode and indicates whether the 4G communication module normally operates. The SIM card interface of the 4G communication module is arranged on a main circuit board, the SIM card SIMCARD SMPT08-C0-0190 card is arranged at the interface end of the SIM card, the card is pop-up type and is convenient and easy to operate, the card interface is provided with communication interface ends, namely SIMVCC, SIMIO, SIMCLK and SIMRESET, which are in communication connection with a corresponding lead piece of the N58 module, and signal pins are respectively provided with a filter capacitor, an anti-static ESD tube and a current-limiting noise-reducing resistor. The interface between the main circuit board and the N58 communication module is mainly two single row sockets CON3, CON 41X 10, which respectively provide a module power supply, a data port and a control port.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but all changes that can be made by applying the principles of the present invention and performing non-inventive work on the basis of the principles shall fall within the scope of the present invention.

Claims

1. An information acquisition remote communication terminal is characterized by comprising a shell for packaging, a first PCB and a second PCB which are arranged in the shell and connected through corresponding interfaces, wherein the first PCB is loaded with a switching power supply module and a clock circuit unit, and the second PCB is loaded with a main chip circuit, a communication module, a 485 circuit and a power supply conversion circuit; the switch power supply module is connected with an alternating current input, converts the alternating current input into direct current and outputs the direct current to the clock circuit unit and the power supply conversion circuit; the clock circuit unit is powered by the switch power supply module and communicates with the main chip circuit to calibrate time so as to provide standard time timing; the power supply conversion circuit is used for converting direct current power supply of the switching power supply module into direct current voltage required by the main chip circuit, the communication module and the 485 circuit; the 485 circuit is used for acquiring external ammeter data, converting the external ammeter data into corresponding differential signals and then sending the differential signals to a remote place through the main chip circuit and the communication module; the main chip circuit is used for processing communication data; and the communication module is used for sending the collected and processed data to a remote end.

2. The information acquisition remote communication terminal as recited in claim 1, wherein the second PCB is provided with an LED indication circuit for displaying a color corresponding to the operating status of the terminal on the housing.

3. The information-collecting remote communication terminal as claimed in claim 2, wherein the switching power supply module includes a voltage dependent resistor RV1 connected between the incoming line end L of the AC live wire and the incoming line end N of the AC neutral wire, a fuse tube F1 connected to the incoming line end L of the AC live wire at one end, a protection resistor R1 connected to the fuse tube F1 at the other end and to the incoming line end N of the AC neutral wire at the other end, a safety capacitor C1 connected with the protective resistor R1 in parallel, an inductor L1 and an inductor L2 respectively connected with two ends of the safety capacitor C1, a bridge core piece U1 with a wire inlet end connected with the other ends of the inductor L1 and the inductor L2, a thermistor RT1 connected with the positive output end of the bridge stack chip U1, an electrolytic capacitor C3 with one end connected with the negative output end of the bridge stack chip U1 and the other end connected with the other end of the thermistor RT1, and a high-frequency switch converting unit connected to both ends of the electrolytic capacitor C3 and converting and outputting a direct current.

4. The information acquisition remote communication terminal as claimed in claim 3, wherein the high frequency switch conversion unit comprises a high frequency switch chip IC1 with model number TOPSWITCH224 and a high frequency transformer T1, wherein one end of a primary power supply end of the high frequency transformer T1 is connected with the anode of an electrolytic capacitor C3, the other end is connected with a DRAIN pin of a high frequency switch chip IC1, a primary feedback end of the high frequency transformer T1 is connected with a SOURCE pin of the high frequency switch chip IC1 through a diode D3, a capacitor C3 and a capacitor C4 and is grounded through a capacitor C8, the secondary end of the high frequency transformer T1 is connected with a secondary filter unit, a SOURCE pin of the high frequency switch chip IC1 is connected with the cathode of the electrolytic capacitor C3, and a CONTROL pin of the high frequency switch chip IC1 is connected with the secondary filter unit through a sampling circuit.

5. The information acquisition remote communication terminal as claimed in claim 4, wherein the sampling circuit comprises a capacitor C5 connected between a SOURCE pin and a CONTROL pin of the high frequency switch chip IC1, a capacitor C6 and a capacitor C7 connected with the CONTROL pin of the high frequency switch chip IC1 at one end and grounded at the other end after being connected in parallel, an optical coupler N1 connected with the CONTROL pin of the high frequency switch chip IC1 and a primary feedback end of the high frequency transformer T1 at an output end respectively, a resistor R3 and a resistor R4 connected between input ends of the optical coupler N1, a diode D5 with a negative electrode connected with an input end of the optical coupler N1, a resistor R2 and a capacitor C9 connected with the diode D5 in parallel after being connected in series, and a resistor R6 and a resistor R7 connected with a positive electrode of the diode D5 at one end and a secondary filter unit at the other end after being connected in series, wherein the resistor R7 is further grounded through a resistor R5 and a resistor R3 is further connected with the secondary filter unit.

6. The information capturing remote communication terminal as claimed in claim 5, wherein the second filtering unit comprises a diode D4, an inductor L3, an inductor L4, an inductor L5, an electrolytic capacitor C5, a resistor R5 and a resistor R5, wherein the positive terminal of the diode D5 is connected to the positive terminal of the secondary side of the high frequency transformer T5, the electrolytic capacitor C5 is connected to the negative terminal of the diode D5 at one end, the other end is connected to the negative terminal of the high frequency transformer T5 and grounded, the capacitor C5 is connected to the negative terminal of the secondary side of the high frequency transformer T5 in parallel, the electrolytic capacitor C5 is connected to the resistor C5 in parallel, the inductor L5 and the inductor L5 are connected to the ground at one end, the other end of the resistor R5 is connected to the ground at one end, the other end of the inductor L5 and the resistor R5 are connected to the ground at the other end, the inductor L5 and the resistor L5 are connected to serve as the DC output of the resistor R5, and to ground through the transient diode TVS 1.

7. The information-gathering remote communication terminal as recited in claim 6, wherein the clock circuit unit comprises a clock chip IC2, a resistor R11 having one end connected to the SCL pin of the 3.3V power supply and the other end connected to the clock chip IC2, a resistor R12 having one end connected to the 3.3V power supply and the other end connected to the SDA pin of the clock chip IC2, diodes D6, D7, D8 and D9 connected in series in sequence, a resistor R15 having one end connected to the cathode of the diode D9 and the other end connected to the VDD pin of the clock chip IC2, and a diode D10 having an anode connected to the battery BT1 and a cathode connected to the resistor R15, wherein the SCL pin and the SDA pin of the clock chip IC2 are both in circuit connection communication with the main chip.

8. The information acquisition remote communication terminal as claimed in claim 7, wherein the power conversion circuit comprises a first power conversion circuit for supplying power to the 485 circuit and the main chip circuit and a second power conversion circuit for supplying power to the communication module; the first power conversion circuit comprises a voltage stabilizing chip IC3, and a capacitor C16, a capacitor C17, a capacitor C18 and a transient diode TVS2 which are connected with a voltage stabilizing chip IC 3; the second power conversion circuit comprises a voltage stabilizing chip IC4, and resistors R17, R18 and R19 and capacitors C20, C21, C22 and C23 which are connected with the voltage stabilizing chip IC 4.

9. The information-gathering remote communication terminal as claimed in claim 8, wherein the 485 circuit includes a converting chip IC5, a resistor R26 having one end connected to a 5V power supply and the other end connected to the RO pin of the converting chip IC5, a resistor R27 and a resistor R28 having one end connected to the RO pin of the converting chip IC5 and the other end connected to ground in series, a resistor R25 having one end connected to the 5V power supply and the other end connected to the RE and DE pins of the converting chip IC5, a transistor Q2 having a collector connected to the RE and DE pins of the converting chip IC5 and an emitter connected to the GND pin of the converting chip IC5, a resistor R25 having one end connected to the DI pin of the converting chip IC5 and the other end connected to the base of the transistor Q3, a resistor R29 having one end connected to the DI pin of the converting chip IC 365 and the other end connected to the main chip circuit, a resistor R29 having one end connected to the a pin of the converting chip IC5 and the other end connected to a differential signal 485A, a resistor R29 and another resistor R825732 connected to a transient signal circuit, a resistor R31 which is connected with the B pin of the conversion chip IC5 in a terminating way and the other end of which is used as the output of another differential signal 485B, a resistor R32 and a transient diode TVS4 which are connected with the other end of the resistor R31 in a parallel way and the other end of which is grounded, and a transient diode TVS5 which is connected between the two differential signals, wherein the Vcc pin of the conversion chip IC5 is connected with 5V power supply and is grounded through a capacitor C24.

10. The information acquisition remote communication terminal as claimed in claim 9, wherein the main chip circuit is an STM32 single chip circuit, and the communication module is a 4G communication module of type N58.