CN110164115A - A kind of multi-mode Internet of Things wisdom energy source data acquisition terminal - Google Patents

Abstract

An embodiment of the present application provides a multi-mode Internet of Things smart energy data collection terminal, wherein the multi-mode Internet of Things smart energy data collection terminal includes a microprocessor, an RS485 communication module, an NB‑IoT communication module, an infrared communication module, a radio frequency A communication module, the NB-IoT communication module includes a power switch, a level conversion circuit and an NB-IoT communication unit; the RS485 communication module, the infrared communication module and the radio frequency communication module are respectively connected to the microprocessor, and the power supply The input end of the switch and the input end of the level conversion circuit are respectively connected to the microprocessor, and the output end is respectively connected to the NB‑IoT communication module, so as to adapt to data transmission requirements in different data collection scenarios.

Description

A multi-mode IoT smart energy data acquisition terminal

technical field

This application relates to the technical field of data communication equipment, in particular, to a multi-mode Internet of Things smart energy data collection terminal.

Background technique

At present, data collection terminals are widely used in water, electricity, gas, heating and other energy collection fields to collect data such as flow, pressure, and usage of water, electricity, gas, and heating, and transmit the collection results to remote The end server performs data statistics and analysis, so that the remote server can realize the control and efficient utilization of energy according to the analysis results.

Contents of the invention

The embodiment of the present application provides a multi-mode Internet of Things smart energy data collection terminal, the details are as follows.

On the one hand, the embodiment of the present application provides a multi-mode Internet of Things smart energy data collection terminal, which is applied to the data collection terminal, including a microprocessor, an RS485 communication module, an NB-IoT communication module, an infrared communication module, and a radio frequency communication module. The NB-IoT communication module includes a power switch, a level conversion circuit and an NB-IoT communication unit;

The RS485 communication module, the infrared communication module and the radio frequency communication module are respectively connected with the microprocessor, the input terminal of the power switch and the input terminal of the level conversion circuit are respectively connected with the microprocessor, and the output terminal Connect with the NB-IoT communication module respectively;

Wherein, the microprocessor is used to provide different control signals to the RS485 communication module, the infrared communication module, the radio frequency communication module and the power switch to control the on-off status of each communication module, so that the multiple Mode Internet of Things smart energy data acquisition terminal works in different communication modes; the power switch is used to control the power supply state of the NB-IoT communication unit according to the control signal provided by the microprocessor; the level conversion circuit is used To implement level conversion to provide the NB-IoT communication unit with a matching level signal.

In the selection of the embodiment of the present application, the power switch includes a first voltage divider circuit, a first filter circuit and a first switch tube (Q1);

The input terminal of the first voltage divider circuit is connected to the first output terminal (M_GVC) of the microprocessor to obtain a control signal, and the output terminal is connected to the control terminal of the first switching tube (Q1); the first A filter circuit is connected between the output terminal of the first switching tube (Q1) and ground, and the output terminal of the first switching tube (Q1) is also connected to the NB-IoT communication unit;

Wherein, when the control signal input to the control terminal of the first switch (Q1) is a low-level signal, the first switch (Q1) is turned on and supplies power to the NB-IoT communication unit; when the input When the control signal at the control terminal of the first switching tube (Q1) is a high-level signal, the first switching tube (Q1) is turned off and stops supplying power to the NB-IoT communication module.

In the selection of the embodiment of the present application, the level conversion circuit includes a first conversion branch and a second conversion branch, and the first conversion branch and the second conversion branch respectively include a current limiting resistor (R3), a second Two filter circuits, a second switch tube (Q2) and a pull-up resistor (R4);

In the first conversion branch, the control terminal of the second switching tube (Q2) is connected to the second filter circuit, the input terminal is connected to the pull-up resistor (R4) and the NB-IoT communication unit connected respectively, the output terminal is connected with one end of the current limiting resistor (R3), and the other end of the current limiting resistor (R3) is connected with the second output terminal (M_GTX) of the microprocessor;

In the second switching branch, the control terminal of the second switching tube (Q2) is connected to the second filter circuit, and the input terminal is connected to the pull-up resistor (R4) and the current limiting resistor (R3 ) are respectively connected to one end, the output end is connected to the NB-IoT communication unit, and the other end of the current limiting resistor (R3) is connected to the first input end (M_GRX) of the microprocessor.

In the selection of the embodiment of the present application, the RS485 communication module includes a first bus, a second bus, a bidirectional level shifter, a first voltage stabilizing resistor (R6), a second voltage stabilizing resistor (R7), a bidirectional anti-interference Circuit and terminal resistance (R12);

The first input terminal of the bidirectional level converter is connected to the receiver output enable terminal (RE) of the microprocessor, and the second input terminal is connected to the driver output enable terminal (DE) of the microprocessor , the first output terminal is connected to the receiver input terminal (RO) of the microprocessor, and the second output terminal is connected to the driver input terminal (DI) of the microprocessor; one end of the first bus is connected to the One end of the second bus is respectively connected to the third input end and the third output end of the bidirectional level shifter;

One end of the first voltage stabilizing resistor (R6) is connected to the first bus, and the other end is connected to 485 level; one end of the second voltage stabilizing resistor (R7) is connected to the second bus, and the other end is connected to 485 level, the first voltage stabilizing resistor (R6) and the second voltage stabilizing resistor (R7) are used to stabilize the bus levels on the first bus and the second bus;

The two-way anti-interference circuit and the terminal resistor (R12) are connected between the first bus and the second bus respectively, and the two-way anti-interference circuit is used to prevent surge current on the bus.

In the selection of the embodiment of the present application, the bidirectional anti-interference circuit includes a bidirectional TVS suppression diode, a first varistor (R10) and a second varistor (R11);

One end of the first varistor (R10) is connected to the first bus, and the other end is grounded; one end of the second varistor (R11) is connected to the second bus, and the other end is grounded. The two input terminals of the bidirectional TVS suppression diode are respectively connected to the first bus and the second bus, and the output terminal is grounded.

In the selection of the embodiment of the present application, the radio frequency communication module includes a radio frequency chip, a radio frequency impedance matching network and a transceiving switch;

The first input terminal of the radio frequency chip is connected to the clock control terminal (SCK) of the microprocessor, the second input terminal is connected to the fourth output terminal (MISO) of the microprocessor, and the third input terminal is connected to the microprocessor. The chip reset terminal (RST) of the microprocessor is connected, the fourth input terminal is connected with the chip enable terminal (SS) of the microprocessor, and the fifth input terminal is connected with the first output terminal of the radio frequency impedance matching network , the first output terminal is connected with the second input terminal (MISI) of the microprocessor, the second output terminal is connected with the first switch input terminal (DIO0) of the microprocessor, and the third output terminal is connected with the The second switching value input terminal (DIO1) of the microprocessor is connected, the fourth output terminal is connected with the third switching value input terminal (DIO2) of the microprocessor, and the fifth output terminal is connected with the first switching value input terminal (DIO2) of the radio frequency impedance matching network. an input connection;

The second input end of the RF impedance matching network is connected to the output end of the transceiver switch, the second output end is connected to the input end of the transceiver switch, and the transceiver switch is also connected to the radio frequency antenna.

In the selection of the embodiment of the present application, the multi-mode Internet of Things smart energy data collection terminal further includes a first voltage measurement circuit and a second voltage measurement circuit;

The first voltage measurement circuit includes a third switching tube (Q3), a first voltage dividing resistor (R16), a second voltage dividing resistor (R17), a fourth switching tube (Q4), a first feedback resistor (R18), The second feedback resistor (R19) and the first pull-up resistor (R20); wherein, the input end of the third switching tube (Q3) is connected to an external power supply, and the output end is connected to one end of the first voltage dividing resistor (R16) , the control terminal is connected between the input terminal of the fourth switching tube (Q4) and the first pull-up resistor (R20); one end of the second voltage dividing resistor (R17) is connected to the first voltage dividing resistor The other end of the resistor (R16) is connected and the other end is grounded; the control terminal of the fourth switching tube (Q4) is connected to one end of the first feedback resistor (R18), and the output terminal is grounded, and the second feedback resistor ( R19) is connected between the control terminal of the fourth switching tube (Q4) and ground, and the other end of the first feedback resistor (R18) is connected to the measurement control terminal (PWRCVIN) of the microprocessor;

The second voltage measurement circuit includes a low-dropout linear voltage regulator, a third voltage-dividing resistor (R21), a fourth voltage-dividing resistor (R22), and a bridge resistor (R23); wherein, the low-dropout linear voltage regulator The input terminal is connected to an external power supply, the output terminal is connected to one end of the third voltage dividing resistor (R21), one end of the fourth voltage dividing resistor (R22) is connected to the other end of the first voltage dividing resistor (R16) and The other end of the third voltage dividing resistor (R21) is respectively connected, and the other end of the third voltage dividing resistor (R21) is connected with the voltage measuring terminal (PWRMES) of the microprocessor, and the fourth voltage dividing The other end of the resistor (R22) is connected with the voltage output end (PWRCVCC) of the microprocessor.

In the selection of the embodiment of the present application, the multi-mode Internet of Things smart energy data collection terminal further includes a power-down detection circuit, and the power-down detection circuit includes a diode (D1), a third pull-up resistor (R24), a fifth branch piezoresistor (R25), sixth voltage divider resistor (R26) and supercapacitor (C5);

The cathode of the diode (D1), one end of the third pull-up resistor (R24), and one end of the fifth voltage dividing resistor (R25) are respectively connected to the output end of the low dropout linear regulator, so The other end of the third pull-up resistor (R24) is connected to the first level detection terminal (PWRCK) of the microprocessor, and the other end of the fifth voltage dividing resistor (R25) is connected to the sixth dividing resistor respectively. One end of the piezoresistor (R26) is connected to the detection control terminal (PWRPD) of the microprocessor, the other end of the sixth voltage dividing resistor (R26) is grounded, and one end of the supercapacitor (C5) is connected to the diode The positive poles of (D1) are respectively connected to the power supply, and the other end of the supercapacitor (C5) is grounded.

In the selection of the embodiment of the present application, the multi-mode Internet of Things smart energy data collection terminal further includes an actuator drive circuit and a pulse metering circuit, and the actuator drive circuit and the pulse metering circuit are respectively connected with the microprocessor connect.

In the multi-mode Internet of Things smart energy data collection terminal provided in the embodiment of the present application, a plurality of different communication modules are integrated to adapt to the data transmission requirements in different data collection scenarios, such as providing different control via a microprocessor Signals are sent to different communication modules so that the multi-mode Internet of Things smart energy data collection terminal works in different communication modes for data transmission, so as to greatly reduce the transmission efficiency of the multi-mode Internet of Things smart energy data collection terminal when performing data transmission consumption.

In order to make the above-mentioned purpose, features and advantages of the present application more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of a block structure of a multi-mode Internet of Things smart energy data collection terminal provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of the circuit structure of the NB-IoT communication unit shown in FIG. 1 .

FIG. 3 is a schematic diagram of the circuit structure of the power switch shown in FIG. 1 .

FIG. 4 is a schematic diagram of the circuit structure of the level conversion circuit shown in FIG. 1 .

FIG. 5 is a schematic diagram of the circuit structure of the RS485 communication module shown in FIG. 1 .

FIG. 6 is a schematic diagram of the circuit structure of the radio frequency communication module shown in FIG. 1 .

FIG. 7 is a schematic diagram of the circuit structure of the infrared communication module shown in FIG. 1 .

FIG. 8 is another schematic block diagram of a multi-mode Internet of Things smart energy data collection terminal provided by an embodiment of the present application.

FIG. 9 is a schematic diagram of the circuit structure of the first voltage measurement circuit, the second voltage measurement circuit and the power-down detection circuit shown in FIG. 8 .

FIG. 10 is a schematic diagram of the circuit structure of the pulse metering circuit shown in FIG. 8 .

FIG. 11 is a schematic diagram of the circuit structure of the actuator driving circuit shown in FIG. 8 .

FIG. 12 is a schematic diagram of the circuit structure of the actuator in-position detection signal judging circuit shown in FIG. 8 .

FIG. 13 is a schematic diagram of a display interface of the display circuit shown in FIG. 8 .

FIG. 14 is another schematic block diagram of a multi-mode Internet of Things smart energy data collection terminal provided by an embodiment of the present application.

Icons: 10-Multi-mode Internet of Things smart energy data acquisition terminal; 11-Microprocessor; 12-RS485 communication module; 120-First bus; 121-Second bus; 122-Bidirectional level converter; 123-Bidirectional anti Interference circuit; 124-bidirectional TVS suppression diode; 13-NB-IoT communication module; 130-power switch; 1300-first voltage divider circuit; 1301-first filter circuit; 131-level conversion circuit; 1310-first conversion Branch; 1311-second filter circuit; 132-NB-IoT communication unit; 14-infrared communication module; 15-radio frequency communication module; 150-radio frequency chip; 151-radio frequency impedance matching network; The first voltage measurement circuit; 17-the second voltage measurement circuit; 18-power failure detection circuit; 19-pulse measurement circuit; 20-actuator drive circuit; 21-display circuit.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

After research, it is found that in some existing implementations, due to the single data transmission mode of the data collection terminal during data transmission, it cannot meet the data transmission requirements in different data collection scenarios. In this regard, the embodiment of this application provides a A multi-mode Internet of Things smart energy data collection terminal 10 and a data collection terminal, so as to adapt to data transmission requirements in different data collection scenarios by integrating a plurality of different communication modules in the multi-mode Internet of Things smart energy data collection terminal 10, The technical solutions provided by the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

First of all, it should be noted that in the following embodiments and drawings, VCC represents the supply voltage of an external power source (such as a battery, etc.), VIN represents the battery conversion voltage, and others such as VGT, V485, VID, etc. represent the internal conversion output voltage.

Please refer to FIG. 1 , which is a schematic block diagram of a multi-mode Internet of Things smart energy data collection terminal 10 provided by the embodiment of the present application. The multi-mode Internet of Things smart energy data collection terminal 10 includes a microprocessor 11, an RS485 communication module 12, NB-IoT (Narrow Band Internet of Things, Narrow Band Internet of Things) communication module 13, infrared communication module 14, radio frequency communication module 15, described NB-IoT communication module 13 comprises power switch 130, level conversion circuit 131 and NB-IoT communication Unit 132. Wherein, the RS485 communication module 12, the infrared communication module 14 and the radio frequency communication module 15 are respectively connected with the microprocessor 11, and the input end of the power switch 130 and the input end of the level conversion circuit 131 are respectively connected with the The microprocessor 11 is connected, and the output end is respectively connected to the NB-IoT communication unit 132 .

During actual implementation, the microprocessor 11 can be used to provide different control signals to the RS485 communication module 12, the infrared communication module 14, the radio frequency communication module 15 and the power switch 130 to control the power of each communication module. The on-off state makes the multi-mode Internet of Things smart energy data collection terminal 10 work in different communication modes for data transmission, and at the same time greatly reduces the transmission efficiency of the multi-mode Internet of Things smart energy data collection terminal 10 when performing data transmission. consumption.

In detail, the microprocessor 11 is used as the core module for data processing, sending and receiving, communication module control, etc. in the multi-mode Internet of Things smart energy data collection terminal 10, and its specific model or type can be flexibly selected according to actual needs, For example, the microprocessor 11 may be, but not limited to, an STM8 series single-chip microcomputer, etc., which is not limited in this embodiment.

The NB-IoT communication module 13 is used to realize integrated communication of NB-IoT communication. In this embodiment, the standby power consumption of the multi-mode Internet of Things smart energy data collection terminal 10 can be reduced by using the power switch 130, such as the power switch 130 can be used to control according to the control signal provided by the microprocessor 11 The power supply state of the NB-IoT communication unit 132 .

In actual implementation, the NB-IoT communication unit 132 can choose but not limited to the ME3616 type NB-IoT communication module, assuming that the NB-IoT communication unit 132 uses the ME3616 type NB-IoT communication module, then the NB- The circuit structure of IoT communication unit 132 can be shown in Figure 2, wherein, resistor R30, resistor R31, resistor R32, diode D2, switch tube Q6 can form a display light drive circuit; resistor R27, resistor R28 and switch tube Q5 can form a A reset switch, the reset switch is used to restart the ME3616 NB-IoT communication module, J1R is reserved and used as an upgrade port when the NB-IoT communication unit 132 is upgraded, and J2R is the antenna socket, which is used after the antenna is installed Realize data communication.

Further, the power switch 130 is used to turn off the NB-IoT communication unit 132 and stop supplying power to it after the communication is completed, so as to reduce the standby power consumption of the multi-mode IoT smart energy data collection terminal 10 . In detail, the power switch 130 may be, but not limited to, a PMOS (P-type Metal Oxide Semiconductor Field Effect Transistor, Positive Channel Metal Oxide Semiconductor) power switch. For example, as shown in FIG. 3 , in this embodiment, the power switch 130 may include a first voltage divider circuit 1300 , a first filter circuit 1301 and a first switch tube Q1 . The input terminal of the first voltage divider circuit 1300 is connected to the first output terminal M_GVC of the microprocessor 11 to obtain a control signal, and the output terminal is connected to the control terminal of the first switching tube Q1; the first filter The circuit 1301 is connected between the output terminal of the first switching transistor Q1 and the ground, and the output terminal of the first switching transistor Q1 is also connected to the NB-IoT communication unit 132 . Wherein, when the control signal input to the control terminal of the first switching transistor Q1 is a low-level signal, the first switching transistor Q1 is turned on and supplies power to the NB-IoT communication unit 132; when the first switching transistor Q1 is input When the control signal at the control end of the switch transistor Q1 is a high-level signal, the first switch transistor Q1 is turned off and stops supplying power to the NB-IoT communication module 13 . It can be understood that, the first switching transistor Q1 may be but not limited to a PMOS transistor.

The level conversion circuit 131 can be selected but not limited to a 3.3V-1.8V level conversion circuit 131, so as to realize the bidirectional conversion between the 3.3V level and the 1.8V level, so that the 3.3V level provided by the microprocessor 11 The level between the transceiver level and the 1.8V level required by the NB-IoT communication unit 132 is matched. In actual implementation, please refer to FIG. 4 , the level conversion circuit 131 may include a first conversion branch 1310 and a second conversion branch, and the first conversion branch 1310 and the second conversion branch respectively include a current limiting resistor R3, the second filter circuit 1311, the second switch tube Q2 and the pull-up resistor R4.

Wherein, in the first conversion branch 1310, the control terminal of the second switching transistor Q2 is connected to the second filter circuit 1311, and the input terminal is connected to the pull-up resistor R4 and the NB-IoT communication unit 132 are respectively connected, the output end is connected to one end of the current limiting resistor R3, and the other end of the current limiting resistor R3 is connected to the second output end M_GTX of the microprocessor 11 .

In the second conversion branch, the control terminal of the second switching tube Q2 is connected to the second filter circuit 1311, and the input terminal is connected to the pull-up resistor R4 and one end of the current limiting resistor R3 respectively. , the output end is connected to the NB-IoT communication unit 132 , and the other end of the current limiting resistor R3 is connected to the first input end M_GRX of the microprocessor 11 .

Optionally, as shown in FIG. 4, the second filter circuit 1311 may be, but not limited to, an RC filter circuit composed of a resistor R5 and a capacitor C2, and the second switch tube Q2 may be, but not limited to, a triode. Examples are not limited here. In addition, it should be noted that, in the embodiment of the present application, the first conversion branch 1310 and the second conversion branch are respectively used when the NB-IoT communication unit 132 performs signal reception or signal transmission. For example, the first conversion branch 1310 is used to provide a level signal matching its work when the NB-IoT communication unit 132 receives a signal, which will not be described again in this embodiment.

Further, the RS485 communication module 12 is used to implement 485 bus communication to obtain various types of data sent by other devices connected to the multi-mode Internet of Things smart energy data collection terminal 10, or to Other devices connected to the networked smart energy data collection terminal 10 send various data and the like. As shown in Figure 5, in the embodiment of the present application, the RS485 communication module 12 may include a first bus 120, a second bus 121, a bidirectional level shifter 122, a first voltage stabilizing resistor R6, a second voltage stabilizing resistor R7, a bidirectional anti-jamming circuit 123 and a terminal resistor R12.

Wherein, the first input end of the bidirectional level shifter 122 is connected to the receiver output enabling end RE of the microprocessor 11, and the second input end is connected to the driver output enabling end DE of the microprocessor 11. connection, the first output terminal is connected with the receiver input terminal RO of the microprocessor 11, the second output terminal is connected with the driver input terminal DI of the microprocessor 11; one end of the first bus 120 is connected with the One end of the second bus 121 is respectively connected to the third input end and the third output end of the bidirectional level shifter 122 . Optionally, the bidirectional level shifter 122 may be, but not limited to, a full-duplex 485 transceiver for level conversion from TTL level to 485 level.

One end of the first voltage stabilizing resistor R6 is connected to the first bus 120, and the other end is connected to 485 voltage; one end of the second voltage stabilizing resistor R7 is connected to the second bus 121, and the other end is connected to 485 voltage. Level, the first voltage stabilizing resistor R6 and the second voltage stabilizing resistor R7 are used to stabilize the bus levels on the first bus 120 and the second bus 121 . The bidirectional anti-jamming circuit 123 and the terminal resistor R12 are respectively connected between the first bus 120 and the second bus 121 , and the bidirectional anti-jamming circuit 123 is used to prevent surge current on the bus.

As an implementation manner, please refer to FIG. 5 again, the bidirectional anti-jamming circuit 123 may include a bidirectional TVS (Transient Voltage Suppressor) suppression diode 124 , a first varistor R10 and a second varistor R11 . Wherein, one end of the first varistor R10 is connected to the first bus 120, and the other end is grounded; one end of the second varistor R11 is connected to the second bus 121, and the other end is grounded. The two input terminals of the bidirectional TVS suppression diode 124 are respectively connected to the first bus 120 and the second bus 121 , and the output terminal is grounded. In addition, it should be noted that the resistors R13, R14, and R15 shown in FIG. 5 are all pull-up resistors, and the capacitors C3 and C4 are filter capacitors.

In the RS485 communication module 12 given above, V485 is controlled by the power supply switch, and the power supply can be cut off when the bus is not required to work, so as to realize low power consumption; at the same time, the application adopts the TVS suppression diode 124, the first varistor The dual interference suppression circuit jointly formed by R10 and the second piezoresistor R11 can effectively improve the communication reliability of the RS485 communication module 12 .

Further, the radio frequency communication module 15 is used to transmit the data sent by the microprocessor 11 by means of spread spectrum communication, please refer to FIG. 1 again, the radio frequency communication module 15 may include a radio frequency chip 150, a radio frequency impedance matching network 151 and Transceiver switch 152 . Wherein, the first input terminal of the radio frequency chip 150 is connected to the clock control terminal SCK of the microprocessor 11, the second input terminal is connected to the fourth output terminal MISO of the microprocessor 11, and the third input terminal is connected to the fourth output terminal MISO of the microprocessor 11. The chip reset terminal RST of the microprocessor 11 is connected, the fourth input terminal is connected with the chip enabling terminal SS of the microprocessor 11, and the fifth input terminal is connected with the first output terminal of the radio frequency impedance matching network 151 , the first output terminal is connected with the second input terminal MISI of the microprocessor 11, the second output terminal is connected with the first switch input terminal DIO0 of the microprocessor 11, the third output terminal is connected with the microprocessor The second switching value input terminal DIO1 of the device 11 is connected, the fourth output terminal is connected with the third switching value input terminal DIO2 of the microprocessor 11, the fifth output terminal is connected with the first input terminal of the radio frequency impedance matching network 151 connect. Optionally, the radio frequency chip 150 may be but not limited to a SX1278 LoRa radio frequency chip, which may be controlled by the microprocessor 11 through an SPI (Serial Peripheral Interface) bus.

The second input of the radio frequency impedance matching network 151 is connected to the output of the transceiver switch 152, and the second output is connected to the input of the transceiver switch 152, and the transceiver switch 152 is also connected to the radio frequency antenna. connect. In this embodiment, the radio frequency impedance matching network 151 is used to match the radio frequency signal transmitted by the radio frequency chip 150 or the interface of the transceiver switch 152 to an appropriate impedance, so as to realize wireless transmission and reception of data.

The transceiving switch 152 is used to switch the antenna to the receiving or transmitting channel by time intervals, so as to realize half-duplex communication of wireless signals under a single antenna. Optionally, the transceiving switch 152 may adopt, but is not limited to, a PE4259 radio frequency switch.

As an implementation, in the embodiment of the present application, assuming that the radio frequency chip 150 adopts the LoRa radio frequency chip of the SX1278 type, and the transceiver switch 152 adopts the radio frequency switch of the PE4259 type, then as shown in FIG. The compensation crystal oscillator Y1 is used as the clock source of the SX1278 radio frequency chip 150 , and the power supply terminal of Y1 is controlled by the IO pin of the microprocessor 11 . The radio frequency signal transmitted and received by the radio frequency chip 150 enters the transceiving switch 152 after passing through the radio frequency impedance matching network 151 . Since the standby power consumption of the radio frequency chip 150 is large, its power supply is controlled by the IO pin of the microprocessor 11 through the power switch 130 to reduce the average power consumption of the radio frequency chip 150 . In addition, in the radio frequency communication module 15 shown in FIG. 6 , the capacitors C11 , C12 , C13 , C14 , . . . , and C29 are filter capacitors.

It should be noted that when the radio frequency chip 150 adopts the LoRa radio frequency chip of the SX1278 type, the first input end of the radio frequency chip is the SCK port shown in Figure 6, and the second input end is the SCK port shown in Figure 6 . The MISO port, the third input end is the NRESET port shown in Figure 6, the fourth input end is the NSS port shown in Figure 6, the fifth input end is the VBAT2 port shown in Figure 6, and the first output end is The MISI port shown in Figure 6, the second output end is the DIO0 port shown in Figure 6, the third output end is the DIO1 port shown in Figure 6, and the fourth output end is the DIO2 port shown in Figure 6 connected, the fifth output terminal is the PA_BOOST port shown in FIG. 6 .

Further, the infrared communication module 14 is used to convert the TTL (Transistor-Transistor Logic) level signal output by the microprocessor 11 to an appropriate level signal to drive the infrared emitting probe to complete the data transmission. At the same time, the signal output by the infrared receiving probe is converted into a TTL level signal and transmitted to the microprocessor 11 . As an implementation, the circuit structure of the infrared communication module 14 can be shown in Figure 7, wherein the diode D3 and the diode D4 are infrared transceiver probes, and the rest of the devices are used to realize the infrared transceiver probe signal output and input to the microprocessor 11 related circuits. In actual implementation, the passage of VCC can turn on the transistor Q10, and the M_IR signal provided by the microprocessor 11 input through the resistor R43 can pass through the transistor to R10, and then emit through the emitting diode D4.

Further, according to actual needs, as shown in FIG. 8 , the multi-mode IoT smart energy data collection terminal 10 may further include a first voltage measurement circuit 16 and a second voltage measurement circuit 17 . As shown in Figure 9, in this embodiment, the first voltage measurement circuit 16 includes a third switch tube Q3, a first voltage divider resistor R16, a second voltage divider resistor R17, a fourth switch tube Q4, a first feedback Resistor R18, second feedback resistor R19, and first pull-up resistor R20; wherein, the input end of the third switching tube Q3 is connected to an external power supply VIN, the output end is connected to one end of the first voltage dividing resistor R16, and the control end is connected to Between the input terminal of the fourth switching tube Q4 and the first pull-up resistor R20; one end of the second voltage dividing resistor R17 is connected to the other end of the first voltage dividing resistor R16, and the other end is grounded ; The control terminal of the fourth switching tube Q4 is connected to one end of the first feedback resistor R18, and the output terminal is grounded, and the second feedback resistor R19 is connected between the control terminal of the fourth switching tube Q4 and ground , the other end of the first feedback resistor R18 is connected to the measurement control terminal PWRCVIN of the microprocessor 11 .

Please refer to FIG. 9 again, the second voltage measurement circuit 17 includes a low-dropout linear regulator, a third voltage-dividing resistor R21, a fourth voltage-dividing resistor R22, and a cross-connect resistor R23; wherein, the low-dropout linear regulator The input terminal of the device is connected to an external power supply, and the output terminal is connected to one end of the third voltage dividing resistor R21, and one end of the fourth voltage dividing resistor R22 is connected to the other end of the first voltage dividing resistor R16 and the third voltage dividing resistor R16. The other ends of the piezoresistors R21 are respectively connected, the other end of the third voltage dividing resistor R21 is connected to the voltage measuring terminal PWRMES of the microprocessor 11, the other end of the fourth voltage dividing resistor R22 is connected to the microprocessor The voltage output terminal PWRCVCC of the device 11 is connected. It should be understood that the AP shown in FIG. 9 is the low dropout linear regulator. Wherein, the bridging resistor R23 may be a zero-resistance resistor.

In the actual voltage measurement process, when the battery voltage is 3.7V-12V, the voltage measurement function is completed by the first voltage measurement circuit 16 . For example, in the non-measurement state, the PWRCVIN terminal of the microprocessor 11 outputs a low level, and the fourth switching tube Q4 is turned off; the gate voltage of the third switching tube Q3 is VIN, the third switching tube Q3 is turned off, and the first divided voltage The resistor R16 and the second voltage dividing resistor R17 do not consume current. Another example is in the measurement state, the PWRCVIN pin of the microprocessor 11 outputs a high level, the fourth switching tube Q4 is turned on, the gate voltage of Q1P is about 0, the third switching tube Q3 is turned on, and the first branch The piezoresistor R16 and the second voltage dividing resistor R17 form a voltage division, and the _PWRMVCC terminal of the microprocessor 11 outputs the voltage of VIN*(R16)/(R16+R17) to the AD conversion pin of the microprocessor 11 .

When the battery voltage is 3V-3.6V, the voltage measurement is completed by the second voltage measurement circuit 17; as in the non-measurement state, the PWRCVCC pin of the microprocessor 11 outputs a high level, and the third voltage dividing resistor R21 and The fourth voltage dividing resistor R22 does not consume current; and for example, in the measurement state, the PWRCVCC pin of the microprocessor 11 outputs a low level, and the PWRMVCC pin of the microprocessor 11 outputs VIN*(R21)/(R21+ R22) (such as VIN*(51K)/(51K+51K)) to the AD conversion pin of the microprocessor 11.

It should be noted that, in the first voltage measurement circuit 16 and the second voltage measurement circuit 17 shown in FIG. 9 , J2P can be used to connect with a 3-12V battery. When the multi-mode Internet of Things smart energy data acquisition terminal 10 is described, the welding low-dropout linear voltage regulator can be canceled and replaced with a jumper resistor R23; if the battery voltage is 3.7V-12V, then the multi-mode Internet of Things smart energy When the data acquisition terminal 10 is welded with a low-dropout linear voltage regulator, the jumper resistor R23 is canceled.

Further, please refer to FIG. 9 again, the multi-mode Internet of Things smart energy data collection terminal 10 also includes a power-down detection circuit 18, and the power-down detection circuit 18 includes a diode D1, a third pull-up resistor R24, a fifth voltage divider Resistor R25, sixth voltage dividing resistor R26 and supercapacitor C5.

The cathode of the diode D1, one end of the third pull-up resistor R24, and one end of the fifth voltage dividing resistor R25 are respectively connected to the output end of the low dropout linear voltage regulator, and the third pull-up resistor The other end of R24 is connected to the first level detection terminal PWRCK of the microprocessor 11, and the other end of the fifth voltage dividing resistor R25 is respectively connected to one end of the sixth voltage dividing resistor R26 and the microprocessor. 11 is connected to the detection control terminal PWRPD, the other end of the sixth voltage dividing resistor R26 is grounded, one end of the supercapacitor C5 and the anode of the diode D1 are respectively connected to a power supply, and the other end of the supercapacitor C5 is grounded.

During actual implementation, the microprocessor 11 can periodically pull down the level of the PWRPD end, such as after pulling down for 2uS to detect the level of the PWRCK end, if the battery is pulled out, the microprocessor 11 is powered by the supercapacitor C5 , to pull down the PWRPD end to consume the leakage current of the diode D1. If the PWRCK end becomes low level, the microprocessor 11 determines that the power is off; Ping, the microprocessor 11 judges that the power is not lost. It should be noted that the supercapacitor can be arranged between SC+ and SC- shown in FIG. C10 is filtering effect.

During actual implementation, the battery input voltage of 3V-12V can be converted to The working voltage of the multi-mode Internet of Things smart energy data collection terminal 10 is 3V-3.3V, and at the same time realizes the voltage measurement and power failure detection functions, and enables the multi-mode Internet of Things smart energy data collection terminal 10 to obtain a wider voltage range , such as 3.7V-12V, etc., and the battery connected to J2P can be a lithium battery connected in parallel or in series. In addition, the voltage measurement provided in this application can be completed in a short time, and does not consume current when it is in a non-measurement state, effectively reducing the power consumption of the multi-mode IoT smart energy data collection terminal 10 . At the same time, the power-down detection circuit 18 adopted in the present application is insensitive to the reverse leakage current of the diode D1 and has high reliability.

Further, please refer to FIG. 8 again, the multi-mode IoT smart energy data collection terminal 10 may also include a pulse metering circuit 19 and an actuator drive circuit 20, the actuator drive circuit 20 and the pulse metering circuit 19 are respectively Connect with the microprocessor 11.

In detail, the pulse metering circuit 19 is used to sample the number of pulses generated by the double pulse generating circuit (such as Hall switch signal, reed switch on-off signal), and can pull up intermittently to realize the multiple Mode Internet of Things smart energy data collection terminal 10 has low power consumption and is compatible with Hall and reed switch sampling. Please refer to FIG. 10, which is a schematic circuit structure diagram of the pulse metering circuit 19, wherein, when a reed switch sensor is used, the VS terminal of the microprocessor 11 outputs a high level before sampling to provide a pull-up for the signal, and then Sampling the level signals output by the RXD terminal and TXD terminal, and then judging whether the reed switch is closed. When a Hall sensor is used, the MVH terminal outputs a high level to supply power to the Hall sensor before sampling. It should be noted that the resistors R44 and R45 shown in Figure 10 are intermittent power supply pull-up resistors, the capacitors C31 and C32 are receiving/transmitting filter capacitors, and J2M is a pulse sampling port for use with the corresponding data acquisition sensor connection, such as a humidity sensor.

Further, the actuator drive circuit 20 is used to output positive and negative voltage signals with a drive capacity of a preset value (such as 500mA) to drive loads such as ball valves and solenoid valves in the data acquisition terminal, and simultaneously detect the opening and closing of the valves. Close the in-position signal. As an implementation mode, as shown in FIG. 11, it is a schematic diagram of the circuit structure of the actuator driving circuit 20 provided by the embodiment of the present application, wherein the capacitor C33 and the resistor R47 shown in FIG. 11 and the capacitor C34 and the resistor R48 respectively constitute two Group filter circuit, resistor R49 is a pull-down resistor, capacitor C35 is a filter capacitor, V_CON and V_COEF are the forward and reverse signals of the valve actuator from the microprocessor 11, VALVE1 and VALVE2 are connected to the valve actuator, UP is the integrated H-bridge valve execution driver chip.

In addition, the embodiment of the present application also provides an actuator in-position detection signal judging circuit as shown in FIG. 12 , wherein resistors R50 and R51 are output protection resistors; resistors R52 and resistor R53 are pull-up resistors. During the detection period, V_LVC outputs a high-level pull-up signal, and during the non-detection period, V_LVC is pulled low, and the detection circuit does not generate power consumption, so as to effectively reduce the power consumption of the multi-mode Internet of Things smart energy data collection terminal 10 .

Further, according to actual needs, the multi-mode Internet of Things smart energy data collection terminal 10 may also include a display circuit 21, such as a 4*14 56-segment liquid crystal display circuit 21, and its display interface may be as shown in Figure 13. The embodiment will not be repeated here.

In order to further clearly describe the circuit connection relationship between each circuit module and the microprocessor 11 , as shown in FIG. 14 , it is a schematic diagram of the connection relationship between each port of the microprocessor 11 and each circuit module. Among them, regarding the above-mentioned RS485 communication module 12, infrared communication module 14, radio frequency communication module 15, power switch 130, level conversion circuit 131, first voltage measurement circuit 16, second voltage measurement circuit 17, power-down detection circuit 18, The connection relationship between the pulse metering circuit 19 , the driver execution circuit 20 , the display circuit 21 and the microprocessor 11 can be referred to FIG. 14 , which will not be repeated here in this embodiment.

It can be clearly seen from the above that this application adopts the design including NB-IoT communication module 13, radio frequency communication module 15 and infrared communication module 14 for multi-mode data transmission, which satisfies the requirements of remote, factory and on-site real-time data control of terminals. Various needs. For example, the NB-IoT communication module 13 can be used to periodically send data to a remote server; the radio frequency communication module 15 can meet the real-time data collection and transmission within a range of 3 kilometers, and can be used for data control in the factory area; the infrared communication module 14 can It can meet the functions of data reading and parameter setting within 2m distance of the device. In addition, the PMOS power switch adopted in this application can make the interruption have extremely low power consumption, such as when a 58000mAh lithium thionyl chloride power type battery is used, the battery can be used for more than 10 years.

To sum up, in the multi-mode IoT smart energy data collection terminal 10 and the data collection terminal provided in the embodiment of the present application, multiple different communication modules are integrated to meet the data transmission requirements in different data collection scenarios. At the same time, in this application, the microprocessor 11 also provides different control signals to different communication modules so that the multi-mode Internet of Things smart energy data collection terminal 10 works in different communication modes for data transmission, which can greatly reduce multiple The transmission power consumption of the mode IoT smart energy data collection terminal 10 during data transmission.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (9)

1. a kind of multi-mode Internet of Things wisdom energy source data acquisition terminal, which is characterized in that communicated including microprocessor, RS485 Module, NB-IoT communication module, infrared communication module, radio-frequency communication module, the NB-IoT communication module include power switch, Level shifting circuit and NB-IoT communication unit；

The RS485 communication module, infrared communication module and radio-frequency communication module are connect with the microprocessor respectively, the electricity The input terminal of the input terminal of source switch and the level shifting circuit connect with the microprocessor respectively, output end respectively with institute State the connection of NB-IoT communication unit；

Wherein, the microprocessor is for providing different control signals to the RS485 communication module, the infrared communication mould Block, the radio-frequency communication module and the power switch are to control the on off operating mode of each communication module, so that the multi-mode object Networking wisdom energy source data acquisition terminal works in different communication patterns；The power switch is used for according to the microprocessor The control signal of offer controls the power supply state of the NB-IoT communication unit；The level shifting circuit turns for realizing level It changes to provide matched level signal for the NB-IoT communication unit.

2. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that the power supply Switch includes the first bleeder circuit, the first filter circuit and first switch tube (Q1)；

The input terminal of first bleeder circuit is connect to obtain control letter with the first output end (M_GVC) of the microprocessor Number, output end connect with the control terminal of the first switch tube (Q1)；First filter circuit is connected to the first switch Between the output end and ground for managing (Q1), the output end of the first switch tube (Q1) is also connect with the NB-IoT communication unit；

Wherein, when inputting the control signal of control terminal of the first switch tube (Q1) is low level signal, described first is opened It closes pipe (Q1) conducting and powers to the NB-IoT communication unit；When the control for the control terminal for inputting the first switch tube (Q1) When signal is high level signal, the first switch tube (Q1) ends and stops powering to the NB-IoT communication module.

3. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that the level Conversion circuit includes the first converting branch and the second converting branch, and first converting branch and the second converting branch respectively include limiting Leakage resistance (R3), the second filter circuit, second switch (Q2) and pull-up resistor (R4)；

In first converting branch, the control terminal of the second switch (Q2) connect with second filter circuit, is defeated Enter end be separately connected with the pull-up resistor (R4) and the NB-IoT communication unit, output end and the current-limiting resistance (R3) One end connection, the other end of the current-limiting resistance (R3) connect with the second output terminal (M_GTX) of the microprocessor；

In second converting branch, the control terminal of the second switch (Q2) connect with second filter circuit, is defeated Enter end and one end of the pull-up resistor (R4) and the current-limiting resistance (R3) are separately connected, output end and the NB-IoT lead to Believe unit connection, the other end of the current-limiting resistance (R3) is connect with the first input end (M_GRX) of the microprocessor.

4. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that described RS485 communication module includes the first bus, the second bus, two-way level converting device, the first voltage regulation resistance (R6), the second pressure stabilizing electricity Hinder (R7), two-way anti-jamming circuit and terminal resistance (R12)；

Receiver output enable end (RE) of the first input end of the two-way level converting device and the microprocessor connect, the Two input terminals are connect with the driver of microprocessor output enable end (DE), the first output end connects with the microprocessor Receive device input terminal (RO) connection, second output terminal is connect with the driver input end (DI) of the microprocessor；Described first is total One end of one end of line and second bus respectively with the third input terminal and third output end of the two-way level converting device Connection；

One end of first voltage regulation resistance (R6) connect with first bus, 485 level of another termination；Second pressure stabilizing One end of resistance (R7) connect with second bus, 485 level of another termination, first voltage regulation resistance (R6) and described Two voltage regulation resistances (R7) for realizing the bus level in first bus and second bus stabilization；

The two-way anti-jamming circuit and the terminal resistance (R12) are connected across first bus and second bus respectively Between, the two-way anti-jamming circuit is used to prevent the surge current in bus.

5. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 4, which is characterized in that described two-way Anti-jamming circuit includes that two-way TVS inhibits diode, the first varistor (R10) and the second varistor (R11)；

One end of first varistor (R10) is connect with first bus, the other end is grounded；Second varistor (R11) one end is connect with second bus, the other end is grounded, and the two-way TVS inhibits two input terminals point of diode It is not connect with first bus and second bus, output end ground connection.

6. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that the radio frequency Communication module includes radio frequency chip, RF impedance matching network and transceiver toggle switch；

The first input end of the radio frequency chip connect with the Clock control end (SCK) of the microprocessor, the second input terminal with The microprocessor the 4th output end (MISO) connection, third input terminal and the microprocessor chip reset end (RST) Connection, the 4th input terminal connect with the chip enable end (SS) of the microprocessor, the 5th input terminal and the RF impedance The first output end connection of distribution network, the first output end connect with the second input terminal (MISI) of the microprocessor, are second defeated Outlet connect with the first switch amount input terminal (DIO0) of the microprocessor, third output end and the microprocessor second On-off signal end (DIO1) connects, the 4th output end is connect with the third On-off signal end (DIO2) of the microprocessor, 5th output end is connect with the first input end of the RF impedance matching network；

Second input terminal of the RF impedance matching network connect with the output end of the transceiver toggle switch, second output terminal It is connect with the input terminal of the transceiver toggle switch, the transceiver toggle switch is also connect with radio-frequency antenna.

7. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that the multimode Formula Internet of Things wisdom energy source data acquisition terminal further includes first voltage measuring circuit and second voltage measuring circuit；

The first voltage measuring circuit includes third switching tube (Q3), the first divider resistance (R16), the second divider resistance (R17), the 4th switching tube (Q4), the first feedback resistance (R18), the second feedback resistance (R19) and the first pull-up resistor (R20)；Wherein, the input terminal external power supply, output end of the third switching tube (Q3) and first divider resistance (R16) One end connection, control terminal are connected between the input terminal and first pull-up resistor (R20) of the 4th switching tube (Q4)；Institute The one end for stating the second divider resistance (R17) connect with the other end of first divider resistance (R16), other end ground connection；It is described The control terminal of 4th switching tube (Q4) is connect with one end of first feedback resistance (R18), output end is grounded, and described second is anti- Feed resistance (R19) be connected between the control terminal and ground of the 4th switching tube (Q4), first feedback resistance (R18) it is another One end is connect with the measurement control terminal (PWRCVIN) of the microprocessor；

The second voltage measuring circuit includes low pressure difference linear voltage regulator, third divider resistance (R21), the 4th divider resistance (R22) and resistance (R23) is bridged；Wherein, the input terminal external power supply of the low pressure difference linear voltage regulator, output end with it is described One end of third divider resistance (R21) connects, one end of the 4th divider resistance (R22) and first divider resistance (R16) other end of the other end and the third divider resistance (R21) is separately connected, the third divider resistance (R21) The other end connect with the voltage measuring terminal (PWRMES) of the microprocessor, the other end of the 4th divider resistance (R22) It is connect with the voltage output end (PWRCVCC) of the microprocessor.

8. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 7, which is characterized in that the multimode Formula Internet of Things wisdom energy source data acquisition terminal further includes power-fail detection circuit, the power-fail detection circuit include diode (D1), Third pull-up resistor (R24), the 5th divider resistance (R25), the 6th divider resistance (R26) and super capacitor (C5)；

The cathode of the diode (D1), one end of the third pull-up resistor (R24), the 5th divider resistance (R25) One end is connect with the output end of the low pressure difference linear voltage regulator respectively, the other end of the third pull-up resistor (R24) and institute State microprocessor the first level detection end (PWRCK) connection, the other end of the 5th divider resistance (R25) respectively with it is described One end of 6th divider resistance (R26) and detection control terminal (PWRPD) connection of the microprocessor, the 6th partial pressure electricity The other end ground connection of (R26) is hindered, one end of the super capacitor (C5) and the anode of the diode (D1) are separately connected electricity Source, the other end ground connection of the super capacitor (C5).

9. multi-mode Internet of Things wisdom energy source data acquisition terminal according to claim 1, which is characterized in that the multimode Formula Internet of Things wisdom energy source data acquisition terminal further includes actuator driven circuit and pulse measurement circuit, the actuator driven Circuit and the pulse measurement circuit are connect with the microprocessor respectively.