CN110164115B - Multi-mode thing networking wisdom energy data acquisition terminal - Google Patents
Multi-mode thing networking wisdom energy data acquisition terminal Download PDFInfo
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- CN110164115B CN110164115B CN201910488323.2A CN201910488323A CN110164115B CN 110164115 B CN110164115 B CN 110164115B CN 201910488323 A CN201910488323 A CN 201910488323A CN 110164115 B CN110164115 B CN 110164115B
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Abstract
The embodiment of the application provides a multimode Internet of things smart energy data acquisition terminal, wherein the multimode Internet of things smart energy data acquisition terminal comprises a microprocessor, an RS485 communication module, an NB-IoT communication module, an infrared communication module and a radio frequency communication module, wherein the NB-IoT communication module comprises 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 end of the power switch and the input end of the level conversion circuit are respectively connected with the microprocessor, and the output end of the power switch and the input end of the level conversion circuit are respectively connected with the NB-IoT communication module, so that the data transmission requirements under different data acquisition scenes can be met.
Description
Technical Field
The application relates to the technical field of data communication equipment, in particular to a multi-mode Internet of things intelligent energy data acquisition terminal.
Background
At present, the data acquisition terminal is large-scale being applied to energy collection fields such as water, electricity, gas, warm to data such as flow, pressure, use amount to water, electricity, gas, warm are gathered, and convey the data statistics, analysis to the remote server with the acquisition result, make the remote server realize the management and control and the high-efficient utilization to the energy according to the analysis result.
Disclosure of Invention
The embodiment of the application provides a multi-mode thing networking wisdom energy data acquisition terminal, specifically as follows.
On one hand, the embodiment of the application provides a multimode Internet of things intelligent energy data acquisition terminal, which is applied to a data acquisition terminal and comprises a microprocessor, an RS485 communication module, an NB-IoT communication module, an infrared communication module and a radio frequency communication module, wherein the NB-IoT communication module comprises 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 end of the power switch and the input end of the level conversion circuit are respectively connected with the microprocessor, and the output end of the power switch and the input end of the level conversion circuit are respectively connected with the NB-IoT communication module;
the microprocessor is used for providing different control signals to the RS485 communication module, the infrared communication module, the radio frequency communication module and the power switch so as to control the on-off state of each communication module, so that the multi-mode Internet of things smart energy data acquisition terminal works in different communication modes; the power switch is used for controlling the power supply state of the NB-IoT communication unit according to the control signal provided by the microprocessor; the level shift circuit is used for realizing level shift to provide a level signal matched with the NB-IoT communication unit.
In an option of an embodiment of the present application, the power switch includes a first voltage dividing circuit, a first filter circuit, and a first switching tube (Q1);
the input end of the first voltage division circuit is connected with a first output end (M _ GVC) of the microprocessor to obtain a control signal, and the output end of the first voltage division circuit is connected with the control end of the first switching tube (Q1); the first filter circuit is connected between the output end of the first switch tube (Q1) and the ground, and the output end of the first switch tube (Q1) is also connected with the NB-IoT communication unit;
when a control signal input to the control end of the first switch tube (Q1) is a low-level signal, the first switch tube (Q1) is conducted and supplies power to the NB-IoT communication unit; when the control signal input to the control end of the first switch tube (Q1) is a high-level signal, the first switch tube (Q1) is cut off and stops supplying power to the NB-IoT communication module.
In an option of an embodiment of the present application, the level shift circuit includes a first switching branch and a second switching branch, and the first switching branch and the second switching branch respectively include a current limiting resistor (R3), a second filter circuit, a second switching tube (Q2), and a pull-up resistor (R4);
in the first conversion branch, a control terminal of the second switching tube (Q2) is connected to the second filter circuit, an input terminal of the second switching tube is connected to the pull-up resistor (R4) and the NB-IoT communication unit, an output terminal of the second switching tube is connected to one end of the current limiting resistor (R3), and the other end of the current limiting resistor (R3) is connected to a second output terminal (M _ GTX) of the microprocessor;
in the second switching branch, a control end of the second switching tube (Q2) is connected to the second filter circuit, an input end of the second switching tube is connected to the pull-up resistor (R4) and one end of the current-limiting resistor (R3), an output end of the second switching tube 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 an option of an embodiment of the present application, the RS485 communication module includes a first bus, a second bus, a bidirectional level shifter, a first voltage regulator resistor (R6), a second voltage regulator resistor (R7), a bidirectional anti-jamming circuit, and a terminal resistor (R12);
a first input terminal of the bidirectional level shifter is connected with a receiver output enable terminal (RE) of the microprocessor, a second input terminal is connected with a driver output enable terminal (DE) of the microprocessor, a first output terminal is connected with a receiver input terminal (RO) of the microprocessor, and a second output terminal is connected with a driver input terminal (DI) of the microprocessor; one end of the first bus and one end of the second bus are respectively connected with a third input end and a third output end of the bidirectional level converter;
one end of the first voltage-stabilizing resistor (R6) is connected with the first bus, and the other end is connected with 485 level; one end of the second voltage-stabilizing resistor (R7) is connected with the second bus, and the other end is connected with 485 levels, and the first voltage-stabilizing resistor (R6) and the second voltage-stabilizing resistor (R7) are used for realizing the stabilization of the bus levels on the first bus and the second bus;
the bidirectional anti-interference circuit and the terminal resistor (R12) are respectively connected between the first bus and the second bus in a bridge mode, and the bidirectional anti-interference circuit is used for preventing surge current on the buses.
In an option of an embodiment of the present application, the bidirectional jammer rejection circuit includes a bidirectional TVS suppression diode, a first varistor (R10), and a second varistor (R11);
one end of the first piezoresistor (R10) is connected with the first bus, and the other end of the first piezoresistor (R10) is grounded; one end of the second piezoresistor (R11) is connected with the second bus, the other end of the second piezoresistor is grounded, and two input ends of the bidirectional TVS suppression diode are respectively connected with the first bus and the second bus, and the output end of the bidirectional TVS suppression diode is grounded.
In a selection of an embodiment of the present application, the radio frequency communication module includes a radio frequency chip, a radio frequency impedance matching network, and a transmit-receive switch;
a first input end of the radio frequency chip is connected with a clock control terminal (SCK) of the microprocessor, a second input end of the radio frequency chip is connected with a fourth output end (MISO) of the microprocessor, a third input end of the radio frequency chip is connected with a chip reset terminal (RST) of the microprocessor, a fourth input end of the radio frequency chip is connected with a chip enable terminal (SS) of the microprocessor, a fifth input end of the radio frequency chip is connected with a first output end of the radio frequency impedance matching network, a first output terminal is connected with the second input terminal (MISI) of the microprocessor, a second output terminal is connected with the first switching value input terminal (DIO0) of the microprocessor, a third output terminal is connected with the second switching value input terminal (DIO1) of the microprocessor, a fourth output terminal is connected with the third switching value input terminal (DIO2) of the microprocessor, and a fifth output terminal is connected with the first input terminal of the radio frequency impedance matching network;
the second input end of the radio frequency impedance matching network is connected with the output end of the receiving and transmitting change-over switch, the second output end of the radio frequency impedance matching network is connected with the input end of the receiving and transmitting change-over switch, and the receiving and transmitting change-over switch is further connected with the radio frequency antenna.
In the selection of the embodiment of the application, the multi-mode internet of things smart energy data acquisition terminal further comprises a first voltage measurement circuit and a second voltage measurement circuit;
the first voltage measuring circuit comprises 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), a second feedback resistor (R19) and a first pull-up resistor (R20); wherein, the input end of the third switch tube (Q3) is externally connected with a power supply, the output end of the third switch tube is connected with one end of the first divider resistor (R16), and the control end of the third switch tube is connected between the input end of the fourth switch tube (Q4) and the first pull-up resistor (R20); one end of the second voltage-dividing resistor (R17) is connected with the other end of the first voltage-dividing resistor (R16), and the other end is grounded; the control end of the fourth switching tube (Q4) is connected with one end of the first feedback resistor (R18), the output end of the fourth switching tube is grounded, the second feedback resistor (R19) is connected between the control end of the fourth switching tube (Q4) and the ground, and the other end of the first feedback resistor (R18) is connected with the measurement control end (PWRCVIN) of the microprocessor;
the second voltage measuring circuit comprises a low dropout linear regulator, a third voltage dividing resistor (R21), a fourth voltage dividing resistor (R22) and a bridging resistor (R23); the input end of the low dropout linear regulator is externally connected with a power supply, the output end of the low dropout linear regulator is connected with one end of a third voltage-dividing resistor (R21), one end of the fourth voltage-dividing resistor (R22) is connected with the other end of a first voltage-dividing resistor (R16) and the other end of a third voltage-dividing resistor (R21) respectively, the other end of the third voltage-dividing resistor (R21) is connected with a voltage measuring end (PWRMES) of the microprocessor, and the other end of the fourth voltage-dividing resistor (R22) is connected with a voltage output end (PWRCVCC) of the microprocessor.
In the selection of the embodiment of the application, the multimode internet of things smart energy data acquisition terminal further comprises a power-down detection circuit, wherein the power-down detection circuit comprises a diode (D1), a third pull-up resistor (R24), a fifth voltage-dividing resistor (R25), a sixth voltage-dividing resistor (R26) and a super capacitor (C5);
the negative pole of diode (D1), the one end of third pull-up resistance (R24), the one end of fifth divider resistance (R25) respectively with the output of low dropout linear regulator is connected, the other end of third pull-up resistance (R24) with the first level detection end (PWRCK) of microprocessor is connected, the other end of fifth divider resistance (R25) respectively with the one end of sixth divider resistance (R26) and the detection control end (PWRPD) of microprocessor are connected, the other end ground connection of sixth divider resistance (R26), the one end of super capacitor (C5) and the positive pole of diode (D1) are connected the power respectively, the other end ground connection of super capacitor (C5).
In the selection of this application embodiment, multimode thing networking wisdom energy data acquisition terminal still includes executor drive circuit and pulse measurement circuit, executor drive circuit with pulse measurement circuit respectively with microprocessor connects.
In the multi-mode thing networking wisdom energy data acquisition terminal that this application embodiment provided, through integrated a plurality of different communication module to be adapted to the data transmission demand under the different data acquisition scenes, provide different control signal for different communication module so that if accessible microprocessor multi-mode thing networking wisdom energy data acquisition terminal works in different communication mode in order to carry out data transmission, with the transmission consumption of reducing multi-mode thing networking wisdom energy data acquisition terminal when carrying out data transmission by a wide margin.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a block structure schematic diagram of a multimode internet of things smart energy data acquisition terminal provided in an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of the NB-IoT communication unit shown in fig. 1.
Fig. 3 is a schematic circuit diagram of the power switch shown in fig. 1.
Fig. 4 is a circuit structure diagram of the level shift circuit shown in fig. 1.
Fig. 5 is a schematic circuit structure diagram of the RS485 communication module shown in fig. 1.
Fig. 6 is a schematic circuit diagram of the rf communication module shown in fig. 1.
Fig. 7 is a schematic circuit diagram of the infrared communication module shown in fig. 1.
Fig. 8 is another block diagram of the multimode internet of things smart energy data acquisition terminal according to the embodiment of the present application.
Fig. 9 is a schematic circuit structure diagram 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 circuit diagram of the pulse metering circuit shown in fig. 8.
Fig. 11 is a circuit configuration diagram of the actuator driving circuit shown in fig. 8.
Fig. 12 is a schematic circuit configuration diagram of the actuator in-place detection signal determination 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 a schematic block diagram of a multi-mode internet of things smart energy data acquisition terminal according to an embodiment of the present application.
Icon: 10-a multimode Internet of things intelligent energy data acquisition terminal; 11-a microprocessor; 12-RS485 communication module; 120-a first bus; 121-a second bus; 122-a bi-directional level shifter; 123-bidirectional anti-interference circuit; 124-bidirectional TVS suppressor diode; a 13-NB-IoT communication module; 130-power switch; 1300-a first voltage divider circuit; 1301 — a first filtering circuit; 131-a level shift circuit; 1310 — a first conversion branch; 1311-a second filter circuit; a 132-NB-IoT communications unit; 14-an infrared communication module; 15-a radio frequency communication module; 150-radio frequency chip; 151-radio frequency impedance matching network; 152-a transmit-receive switch; 16-a first voltage measurement circuit; 17-a second voltage measurement circuit; 18-power down detection circuitry; 19-a pulse metering circuit; 20-actuator drive circuit; 21-display circuit.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Research shows that in some existing embodiments, data transmission modes of data acquisition terminals during data transmission are single, so that the data transmission requirements under different data acquisition scenes cannot be met, and accordingly, the embodiment of the application provides a multi-mode internet of things smart energy data acquisition terminal 10 and a data acquisition terminal, so as to adapt to the data transmission requirements under different data acquisition scenes by integrating a plurality of different communication modules in the multi-mode internet of things smart energy data acquisition terminal 10, and the technical scheme provided by the embodiment of the application is explained in detail below by combining with the accompanying drawings.
It should be noted that in the following embodiments and the accompanying drawings, VCC represents a supply voltage of an external power source (such as a battery), VIN represents a battery conversion voltage, and other components such as VGT, V485, VID and the like represent internal conversion output voltages.
Referring to fig. 1, a block schematic diagram of a multimode internet of Things smart energy data collection terminal 10 according to an embodiment of the present disclosure is provided, where the multimode internet of Things smart energy data collection terminal 10 includes a microprocessor 11, an RS485 communication module 12, an NB-IoT (Narrow Band internet of Things) communication module 13, an infrared communication module 14, and a radio frequency communication module 15, where the NB-IoT communication module 13 includes a power switch 130, a level conversion circuit 131, and an NB-IoT communication unit 132. The RS485 communication module 12, the infrared communication module 14, and the radio frequency communication module 15 are respectively connected to the microprocessor 11, and the input terminal of the power switch 130 and the input terminal of the level conversion circuit 131 are respectively connected to the microprocessor 11, and the output terminal thereof is respectively connected to the NB-IoT communication unit 132.
In practical 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 on-off state of each communication module, so that the multi-mode internet of things smart energy data acquisition terminal 10 works in different communication modes to perform data transmission, and simultaneously, the transmission power consumption of the multi-mode internet of things smart energy data acquisition terminal 10 during data transmission is greatly reduced.
In detail, the microprocessor 11 is used as a core module for performing data processing, transceiving, communication module control and the like in the multimode internet of things smart energy data acquisition terminal 10, and a specific model or type thereof may be flexibly selected according to actual requirements, for example, the microprocessor 11 may be but is not limited to an STM8 series single chip microcomputer and the like, which is not limited herein.
The NB-IoT communication module 13 is configured to implement integrated communication of NB-IoT communication. In this embodiment, the standby power consumption of the multimode internet of things smart energy data collection terminal 10 can be reduced by using the power switch 130, for example, the power switch 130 can be used to control the power supply state of the NB-IoT communication unit 132 according to the control signal provided by the microprocessor 11.
In practical implementation, the NB-IoT communication unit 132 may be, but is not limited to, an ME3616 type NB-IoT communication module, and assuming that the NB-IoT communication unit 132 is the ME3616 type NB-IoT communication module, a circuit structure of the NB-IoT communication unit 132 may be as shown in fig. 2, wherein the resistor R30, the resistor R31, the resistor R32, the diode D2, and the switching tube Q6 may form a display lamp driving circuit; the resistor R27, the resistor R28 and the switch tube Q5 can form a reset switch, the reset switch is used for restarting the ME3616 type NB-IoT communication module, the J1R is reserved and serves as an upgrading port when the NB-IoT communication unit 132 is upgraded, and the J2R is an antenna socket and is used for achieving data communication after antenna installation.
Further, the power switch 130 is configured to turn off the NB-IoT communication unit 132 and stop supplying power thereto after the communication is completed, so as to reduce the standby power consumption of the multimode internet of things smart energy data collection terminal 10. In detail, the power switch 130 may be, but is not limited to, a PMOS (Positive channel Oxide Semiconductor) power switch. For example, as shown in fig. 3, in the present embodiment, the power switch 130 may include a first voltage divider 1300, a first filter 1301, and a first switch Q1. The input end of the first voltage divider circuit 1300 is connected to the first output end M _ GVC of the microprocessor 11 to obtain a control signal, and the output end is connected to the control end of the first switch Q1; the first filter circuit 1301 is connected between the output end of the first switch Q1 and ground, and the output end of the first switch Q1 is further connected to the NB-IoT communication unit 132. When the control signal input to the control terminal of the first switch tube Q1 is a low level signal, the first switch tube Q1 is turned on and supplies power to the NB-IoT communication unit 132; when the control signal input to the control terminal of the first switch Q1 is a high level signal, the first switch Q1 is turned off and stops supplying power to the NB-IoT communication module 13. It is understood that the first switch Q1 can be, but is not limited to, a PMOS transistor.
The level shifter 131 may be selected from, but not limited to, a 3.3V-1.8V level shifter 131 to realize bidirectional shifting from a 3.3V level to a 1.8V level, so that the 3.3V transceiving level provided by the microprocessor 11 matches the 1.8V level required by the NB-IoT communication unit 132 during operation. In practical implementation, referring to fig. 4, the level shift circuit 131 may include a first switching branch 1310 and a second switching branch 1310, where the first switching branch 1310 and the second switching branch respectively include a current limiting resistor R3, a second filtering circuit 1311, a second switch Q2, and a pull-up resistor R4.
In the first switching branch 1310, a control terminal of the second switching tube Q2 is connected to the second filter circuit 1311, an input terminal thereof is connected to the pull-up resistor R4 and the NB-IoT communication unit 132, an output terminal thereof 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 terminal M _ GTX of the microprocessor 11.
In the second switching branch, a control end of the second switching tube Q2 is connected to the second filter circuit 1311, an input end of the second switching tube Q2 is connected to one end of the pull-up resistor R4 and one end of the current-limiting resistor R3, an output end of the second switching tube Q2 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 is not limited to, an RC filter circuit formed by a resistor R5 and a capacitor C2, and the second switch Q2 may be, but is not limited to, a triode, and the like. In addition, it should be noted that, in this embodiment of the application, the first converting branch 1310 and the second converting branch are respectively used for level conversion when the NB-IoT communication unit 132 performs signal receiving or signal sending, for example, the first converting branch 1310 is used for providing a level signal matched with the operation of the NB-IoT communication unit 132 when the NB-IoT communication unit 132 performs signal receiving, and the like, which is not described herein again.
Further, the RS485 communication module 12 is used for realizing 485 bus communication, so as to acquire various data sent by other devices connected to the multi-mode internet of things smart energy data acquisition terminal 10, or send various data to other devices connected to the multi-mode internet of things smart energy data acquisition terminal 10, and the like. As shown in fig. 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 regulator resistor R6, a second voltage regulator resistor R7, a bidirectional interference rejection circuit 123, and a termination resistor R12.
Wherein, a first input terminal of the bidirectional level shifter 122 is connected to the receiver output enable terminal RE of the microprocessor 11, a second input terminal thereof is connected to the driver output enable terminal DE of the microprocessor 11, a first output terminal thereof is connected to the receiver input terminal RO of the microprocessor 11, and a second output terminal thereof is connected to the driver input terminal DI of the microprocessor 11; one end of the first bus 120 and one end of the second bus 121 are connected to a third input terminal and a third output terminal of the bidirectional level shifter 122, respectively. Optionally, the bi-directional level shifter 122 may be used in, but not limited to, a full-duplex 485 transceiver for performing level shifting from TTL level to 485 level.
One end of the first voltage-stabilizing resistor R6 is connected with the first bus 120, and the other end is connected with the 485 level; one end of the second voltage-stabilizing resistor R7 is connected to the second bus 121, and the other end is connected to 485 levels, and the first voltage-stabilizing resistor R6 and the second voltage-stabilizing resistor R7 are used for stabilizing bus levels on the first bus 120 and the second bus 121. The bidirectional immunity circuit 123 and the terminal resistor R12 are respectively connected across the first bus 120 and the second bus 121, and the bidirectional immunity circuit 123 is used for preventing surge current on the buses.
In one embodiment, referring again to fig. 5, the bidirectional immunity circuit 123 may include a bidirectional TVS (Transient Voltage Suppressor) Suppressor 124, a first Voltage dependent resistor R10, and a second Voltage dependent resistor R11. One end of the first piezoresistor R10 is connected with the first bus 120, and the other end is grounded; one end of the second voltage dependent resistor R11 is connected to the second bus 121, and the other end is grounded, and two input ends of the bidirectional TVS suppressor diode 124 are respectively connected to the first bus 120 and the second bus 121, and the output end is grounded. In addition, the resistor R13, the resistor R14, and the resistor R15 shown in fig. 5 are pull-up resistors, and the capacitor C3 and the capacitor C4 are filter capacitors.
In the RS485 communication module 12, the V485 is controlled by a power supply change-over switch, and a power supply can be switched off when the bus does not work, so that low power consumption is realized; meanwhile, the double-interference suppression circuit formed by the TVS suppression diode 124, the first voltage dependent resistor R10 and the second voltage dependent resistor R11 can effectively improve the communication reliability of the RS485 communication module 12.
Further, the rf communication module 15 is configured to transmit data sent by the microprocessor 11 by a spread spectrum communication party, referring to fig. 1 again, the rf communication module 15 may include an rf chip 150, an rf impedance matching network 151, and a transceiving switch 152. Wherein, the first input terminal of the rf 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, the third input terminal is connected to the chip reset terminal RST of the microprocessor 11, the fourth input terminal is connected to the chip enable terminal SS of the microprocessor 11, the fifth input terminal is connected to the first output terminal of the rf impedance matching network 151, a first output terminal is connected to the second input terminal MISI of the microprocessor 11, a second output terminal is connected to the first switching value input terminal DIO0 of the microprocessor 11, a third output terminal is connected to the second switching value input terminal DIO1 of the microprocessor 11, a fourth output terminal is connected to the third switching value input terminal DIO2 of the microprocessor 11, and a fifth output terminal is connected to the first input terminal of the rf impedance matching network 151. Alternatively, the rf chip 150 may be, but not limited to, an SX1278 type LoRa rf chip, and may receive control of the microprocessor 11 through an SPI (Serial Peripheral Interface) bus.
A second input end of the rf impedance matching network 151 is connected to an output end of the transceiving switch 152, a second output end of the rf impedance matching network is connected to an input end of the transceiving switch 152, and the transceiving switch 152 is further connected to an rf antenna. In this embodiment, the rf impedance matching network 151 is configured to match an rf signal transmitted by the rf chip 150 or received by the interface of the transceiving switch 152 to a suitable impedance, so as to implement wireless transmission and reception of data.
The transceiving switch 152 is used to switch the antenna to a receiving or transmitting channel in different time periods, so as to implement half-duplex wireless signal communication under a single antenna. Alternatively, the transceiving switch 152 may be a radio frequency switch, but is not limited to PE 4259.
As an implementation manner, in the embodiment of the present application, it is assumed that the rf chip 150 is an SX1278 type LoRa rf chip, and the transceiving switch 152 is a PE4259 type rf switch, as shown in fig. 6, a temperature compensation crystal oscillator Y1 may be used as a clock source of the SX1278 rf chip 150, and a power supply terminal of Y1 is controlled by an IO pin of the microprocessor 11. The rf signal transmitted and received by the rf chip 150 enters the transmit/receive switch 152 through the rf impedance matching network 151. Since the standby power consumption of the rf chip 150 is large, the power supply thereof is controlled by the IO pin of the microprocessor 11 through the power switch 130, so as to reduce the average power consumption of the rf chip 150. In addition, in the radio frequency communication module 15 shown in fig. 6, the capacitor C11, the capacitor C12, the capacitor C13, the capacitors C14, … … and the capacitor C29 are all filter capacitors.
It should be noted that, when the radio chip 150 employs an SX1278 type LoRa radio chip, the first input terminal of the radio chip is the SCK port shown in fig. 6, the second input terminal is the MISO port shown in fig. 6, the third input terminal is the NRESET port shown in fig. 6, the fourth input terminal is the NSS port shown in fig. 6, the fifth input terminal is the VBAT2 port shown in fig. 6, the first output terminal is the MISI port shown in fig. 6, the second output terminal is the DIO0 port shown in fig. 6, the third output terminal is the DIO1 port shown in fig. 6, the fourth output terminal is the DIO2 port connection shown in fig. 6, and the fifth output terminal is the PA _ BOOST port shown in fig. 6.
Further, the infrared communication module 14 is configured to convert a TTL (Transistor-Transistor Logic) level signal output by the microprocessor 11 into an appropriate level signal to drive the infrared transmitting probe to complete data transmission. And simultaneously, signals output by the infrared receiving probe are converted into TTL level signals and transmitted to the microprocessor 11. As an embodiment, the circuit structure of the infrared communication module 14 may be as shown in fig. 7, wherein the diode D3 and the diode D4 are infrared transceiving probes respectively, and the rest of the devices are related circuits for outputting and inputting signals of the infrared transceiving probes to the microprocessor 11. In practice, VCC turns on transistor Q10, and the M _ IR signal provided by the microprocessor 11 and input through resistor R43 may pass through transistor R10 and then be emitted through emitting diode D4.
Further, according to actual needs, as shown in fig. 8, the multimode internet of things 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 fig. 9, in the present embodiment, the first voltage measuring circuit 16 includes a third switch tube Q3, a first voltage dividing resistor R16, a second voltage dividing resistor R17, a fourth switch tube Q4, a first feedback resistor R18, a second feedback resistor R19, and a first pull-up resistor R20; an input end of the third switching tube Q3 is externally connected with a power supply VIN, an output end of the third switching tube Q3 is connected with one end of the first voltage-dividing resistor R16, and a control end of the third switching tube Q3 is connected between an input end of the fourth switching tube Q4 and the first pull-up resistor R20; one end of the second voltage-dividing resistor R17 is connected with the other end of the first voltage-dividing resistor R16, and the other end is grounded; the control end of the fourth switching tube Q4 is connected with one end of the first feedback resistor R18, the output end of the fourth switching tube Q4 is grounded, the second feedback resistor R19 is connected between the control end of the fourth switching tube Q4 and the ground, and the other end of the first feedback resistor R18 is connected with the measurement control end PWRCVIN of the microprocessor 11.
Referring to fig. 9 again, the second voltage measuring circuit 17 includes a low dropout regulator, a third voltage dividing resistor R21, a fourth voltage dividing resistor R22, and a bridge resistor R23; the input end of the low dropout linear regulator is externally connected with a power supply, and the output end of the low dropout linear regulator is connected with one end of the third voltage-dividing resistor R21, one end of the fourth voltage-dividing resistor R22 is respectively connected with the other end of the first voltage-dividing resistor R16 and the other end of the third voltage-dividing resistor R21, the other end of the third voltage-dividing resistor R21 is connected with the voltage measuring end PWRMES of the microprocessor 11, and the other end of the fourth voltage-dividing resistor R22 is connected with the voltage output end PWRCVCC of the microprocessor 11. It should be understood that the AP shown in fig. 9 is the low dropout linear regulator. The bridge 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 performed by the first voltage measurement circuit 16. If in the non-measurement state, the PWRCVIN end of the microprocessor 11 outputs a low level, and the fourth switching tube Q4 is turned off; the gate voltage of the third switch Q3 is VIN, the third switch Q3 is turned off, and the first voltage-dividing resistor R16 and the second voltage-dividing resistor R17 do not consume current. In another example, 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, the first voltage dividing resistor R16 and the second voltage dividing resistor R17 form a divided voltage, and the _ PWRMVCC terminal of the microprocessor 11 outputs a voltage 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; if 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 do not consume current; for another 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 a voltage of VIN (R21)/(R21+ R22) (e.g., 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 may be used to connect with a 3-12V battery, for example, the battery voltage is 3V-3.6V, when the multimode internet of things smart energy data acquisition terminal 10 is manufactured, the welding low dropout linear regulator may be removed, and the welding low dropout linear regulator may be replaced with a cross-over resistor R23; if the battery voltage is 3.7V-12V, welding the low dropout regulator when manufacturing the multimode internet of things intelligent energy data acquisition terminal 10, and eliminating a cross-over resistor R23.
Further, referring to fig. 9 again, the multimode internet of things smart energy data acquisition terminal 10 further 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-dividing resistor R25, a sixth voltage-dividing resistor R26, and a super capacitor C5.
A 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 an output terminal of the low dropout linear regulator, the other end of the third pull-up resistor R24 is connected to the first level detection terminal PWRCK of the microprocessor 11, 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 detection control terminal PWRPD of the microprocessor 11, the other end of the sixth voltage-dividing resistor R26 is grounded, one end of the super capacitor C5 and the anode of the diode D1 are respectively connected to a power supply, and the other end of the super capacitor C5 is grounded.
In practical implementation, the microprocessor 11 may periodically pull down the level of the PWRPD terminal, for example, pull down the level of the PWRCK terminal after 2uS, if the battery is unplugged, the microprocessor 11 is powered by the super capacitor C5 to pull down the PWRPD terminal to consume the leakage current of the diode D1, and if the pwrpk terminal becomes low level, the microprocessor 11 determines power failure; if the battery is not unplugged, the PWRCK terminal can still maintain a high level even if the PWRPD is pulled low, and the microprocessor 11 determines that power is not lost. It should be noted that the super capacitor may be disposed between SC + and SC-shown in fig. 9, and the size of the super capacitor may be, but is not limited to, 1F, and in addition, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9, and the capacitor C10 are all filtering functions.
During the actual implementation, through set up first voltage measurement circuit 16, second voltage measurement circuit 17 and power failure detection circuit 18 in the multi-mode thing networking wisdom energy data collection terminal 10, can convert 3V-12V's battery input voltage into 3V-3.3V's multi-mode thing networking wisdom energy data collection terminal 10 operating voltage, realize the measurement of voltage simultaneously, the power failure detection function, and make multi-mode thing networking wisdom energy data collection terminal 10 obtain a wider voltage range, like 3.7V-12V etc., and connect in the battery of J2P department can adopt parallelly connected or the lithium cell of establishing ties. In addition, the voltage measurement that this application provided can be accomplished in the short time, and does not consume the electric current when being in non-measurement state, effectively reduces the consumption of multi-mode thing networking wisdom energy data acquisition terminal 10. Meanwhile, the power failure detection circuit 18 is insensitive to reverse leakage current of the diode D1 and has high reliability.
Further, referring to fig. 8 again, the multimode internet of things smart energy data collection terminal 10 may further include a pulse metering circuit 19 and an actuator driving circuit 20, and the actuator driving circuit 20 and the pulse metering circuit 19 are respectively connected to the microprocessor 11.
In detail, the pulse metering circuit 19 is used for sampling the number of pulses generated by a double-pulse generating circuit (such as a hall switching signal and a reed switch on-off signal), and can be intermittently pulled up to realize the low power consumption of the multimode internet of things intelligent energy data acquisition terminal 10, so that the multimode internet of things intelligent energy data acquisition terminal is compatible with hall and reed switch sampling. Referring to fig. 10, a schematic circuit structure of the pulse metering circuit 19 is shown, wherein when a reed switch sensor is used, before sampling, the VS terminal of the microprocessor 11 outputs a high level to provide a pull-up for a signal, and then level signals output from the RXD terminal and the TXD terminal are sampled, so as to determine whether the reed switch is closed. When the Hall sensor is adopted, the MVH end outputs high level to supply power to the Hall sensor before sampling. It should be noted that the resistors R44 and R45 shown in fig. 10 are intermittent power supply pull-up resistors, the capacitors C31 and C32 are receive/transmit filter capacitors, and J2M is a pulse sampling port for connecting to a corresponding data acquisition sensor, such as a humidity sensor.
Further, the actuator driving circuit 20 is configured to output positive and negative voltage signals with a preset driving capability (e.g., 500mA) to drive loads such as a ball valve and an electromagnetic valve in the data acquisition terminal, and detect signals of the valve in place when the valve is opened and closed. As an implementation manner, as shown in fig. 11, a circuit structure diagram of the actuator driving circuit 20 according to the embodiment of the present application is shown, wherein a capacitor C33 and a resistor R47, and a capacitor C34 and a resistor R48 shown in fig. 11 respectively form two sets of filter circuits, the resistor R49 is a pull-down resistor, the capacitor C35 is a filter capacitor, V _ CON and V _ COEF are positive and negative rotation signals of a VALVE actuator from the microprocessor 11, the VALVE1 and the VALVE2 are connected to the VALVE actuator, and the UP is an integrated H-bridge VALVE actuator driving chip.
In addition, the embodiment of the present application further provides an actuator in-place detection signal determination circuit as shown in fig. 12, wherein the resistor R50 and the resistor R51 are output protection resistors; the resistor R52 and the resistor R53 are pull-up resistors. During the detection period, the V _ LVC outputs a high-level pull-up signal, during the non-detection period, the V _ LVC is pulled down, and the detection circuit does not generate power consumption, so that the power consumption of the multimode Internet of things intelligent energy data acquisition terminal 10 is effectively reduced.
Further, according to actual requirements, the multimode internet of things smart energy data collecting terminal 10 may further include a display circuit 21, such as a 56-segment liquid crystal display circuit 21 with 4 × 14, and a display interface thereof may be shown in fig. 13, which is not described herein again.
For further clarity of description of the circuit connection relationship between each circuit module and the microprocessor 11, as shown in fig. 14, a schematic diagram of the connection relationship between each port of the microprocessor 11 and each circuit module is shown. For the connection relationship among the RS485 communication module 12, the infrared communication module 14, the radio frequency communication module 15, the power switch 130, the level conversion circuit 131, the first voltage measurement circuit 16, the second voltage measurement circuit 17, the power failure detection circuit 18, the pulse metering circuit 19, the driver execution circuit 20, the display circuit 21 and the microprocessor 11, reference may be made to fig. 14, which is not described herein again.
As can be clearly seen from the above, the multi-mode data transmission is performed by adopting the design including the NB-IoT communication module 13, the radio frequency communication module 15, the infrared communication module 14, and the like, so that various requirements for performing real-time data manipulation on the terminal in a remote, factory, and field manner are met. The NB-IoT communication module 13 may be used to periodically send data to the distant server; the radio frequency communication module 15 can meet the requirement of real-time data acquisition and transmission within a range of 3 kilometers and can be used for implementing data manipulation in a factory; the infrared communication module 14 can satisfy the functions of data reading and parameter setting within a distance of 2m of the device. Furthermore, the PMOS power switch employed in the present application enables very low power consumption for the interrupt, as when using a 58000mAh lithium thionyl chloride power type battery, the battery can be used for more than 10 years.
In summary, in the multi-mode internet of things smart energy data collection terminal 10 and the data collection terminal provided in the embodiment of the present application, a plurality of different communication modules are integrated to meet data transmission requirements in different data collection scenarios. Simultaneously, still provide different control signal through microprocessor 11 in this application and give different communication module so that multi-mode thing networking wisdom energy data acquisition terminal 10 works in different communication mode in order to carry out data transmission, can reduce the transmission consumption of multi-mode thing networking wisdom energy data acquisition terminal 10 when carrying out data transmission by a wide margin.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. The multimode Internet of things intelligent energy data acquisition terminal is characterized by comprising a microprocessor, an RS485 communication module, an NB-IoT communication module, an infrared communication module and a radio frequency communication module, wherein the NB-IoT communication module comprises 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 end of the power switch and the input end of the level conversion circuit are respectively connected with the microprocessor, and the output end of the power switch and the input end of the level conversion circuit are respectively connected with the NB-IoT communication unit; the infrared communication module is used for converting the TTL level signal output by the microprocessor into a proper level signal so as to drive the infrared emission probe to finish data transmission;
the microprocessor is used for providing different control signals to the RS485 communication module, the infrared communication module, the radio frequency communication module and the power switch so as to control the on-off state of each communication module, so that the multi-mode Internet of things smart energy data acquisition terminal works in different communication modes; the power switch is used for controlling 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 for realizing level conversion to provide a level signal matched with the NB-IoT communication unit;
the multi-mode Internet of things intelligent energy data acquisition terminal further comprises a first voltage measurement circuit and a second voltage measurement circuit;
the first voltage measuring circuit comprises 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), a second feedback resistor (R19) and a first pull-up resistor (R20); wherein, the input end of the third switch tube (Q3) is externally connected with a power supply, the output end of the third switch tube is connected with one end of the first divider resistor (R16), and the control end of the third switch tube is connected between the input end of the fourth switch tube (Q4) and the first pull-up resistor (R20); one end of the second voltage-dividing resistor (R17) is connected with the other end of the first voltage-dividing resistor (R16), and the other end is grounded; the control end of the fourth switching tube (Q4) is connected with one end of the first feedback resistor (R18), the output end of the fourth switching tube is grounded, the second feedback resistor (R19) is connected between the control end of the fourth switching tube (Q4) and the ground, and the other end of the first feedback resistor (R18) is connected with the measurement control end (PWRCVIN) of the microprocessor;
the second voltage measuring circuit comprises a low dropout linear regulator, a third voltage dividing resistor (R21), a fourth voltage dividing resistor (R22) and a bridging resistor (R23); wherein, the input end of the low dropout linear regulator is externally connected with a power supply, and the output end of the low dropout linear regulator is connected with one end of a third voltage-dividing resistor (R21), one end of the fourth voltage-dividing resistor (R22) is respectively connected with the other end of the first voltage-dividing resistor (R16) and the other end of the third voltage-dividing resistor (R21), the other end of the third voltage-dividing resistor (R21) is connected with a voltage measuring end (PWRMES) of the microprocessor, and the other end of the fourth voltage-dividing resistor (R22) is connected with a voltage output end (PWRCVCC) of the microprocessor;
the multimode Internet of things intelligent energy data acquisition terminal further comprises a power failure detection circuit, wherein the power failure detection circuit comprises a diode (D1), a third pull-up resistor (R24), a fifth voltage-dividing resistor (R25), a sixth voltage-dividing resistor (R26) and a super capacitor (C5);
the negative pole of diode (D1), the one end of third pull-up resistance (R24), the one end of fifth divider resistance (R25) respectively with the output of low dropout linear regulator is connected, the other end of third pull-up resistance (R24) with the first level detection end (PWRCK) of microprocessor is connected, the other end of fifth divider resistance (R25) respectively with the one end of sixth divider resistance (R26) and the detection control end (PWRPD) of microprocessor are connected, the other end ground connection of sixth divider resistance (R26), the one end of super capacitor (C5) and the positive pole of diode (D1) are connected the power respectively, the other end ground connection of super capacitor (C5).
2. The intelligent energy data acquisition terminal of the multi-mode internet of things of claim 1, wherein the power switch comprises a first voltage division circuit, a first filter circuit and a first switch tube (Q1);
the input end of the first voltage division circuit is connected with a first output end (M _ GVC) of the microprocessor to obtain a control signal, and the output end of the first voltage division circuit is connected with the control end of the first switching tube (Q1); the first filter circuit is connected between the output end of the first switch tube (Q1) and the ground, and the output end of the first switch tube (Q1) is also connected with the NB-IoT communication unit;
when a control signal input to the control end of the first switch tube (Q1) is a low-level signal, the first switch tube (Q1) is conducted and supplies power to the NB-IoT communication unit; when the control signal input to the control end of the first switch tube (Q1) is a high-level signal, the first switch tube (Q1) is cut off and stops supplying power to the NB-IoT communication module.
3. The terminal of claim 1, wherein the level shifter circuit comprises a first shifter branch and a second shifter branch, and the first shifter branch and the second shifter branch respectively comprise a current limiting resistor (R3), a second filter circuit, a second switch tube (Q2), and a pull-up resistor (R4);
in the first conversion branch, a control terminal of the second switching tube (Q2) is connected to the second filter circuit, an input terminal of the second switching tube is connected to the pull-up resistor (R4) and the NB-IoT communication unit, an output terminal of the second switching tube is connected to one end of the current limiting resistor (R3), and the other end of the current limiting resistor (R3) is connected to a second output terminal (M _ GTX) of the microprocessor;
in the second switching branch, a control end of the second switching tube (Q2) is connected to the second filter circuit, an input end of the second switching tube is connected to the pull-up resistor (R4) and one end of the current-limiting resistor (R3), an output end of the second switching tube 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.
4. The multi-mode internet of things smart energy data acquisition terminal as claimed in claim 1, wherein the RS485 communication module comprises a first bus, a second bus, a bidirectional level shifter, a first voltage regulator resistor (R6), a second voltage regulator resistor (R7), a bidirectional interference rejection circuit, and a terminal resistor (R12);
a first input terminal of the bidirectional level shifter is connected with a receiver output enable terminal (RE) of the microprocessor, a second input terminal is connected with a driver output enable terminal (DE) of the microprocessor, a first output terminal is connected with a receiver input terminal (RO) of the microprocessor, and a second output terminal is connected with a driver input terminal (DI) of the microprocessor; one end of the first bus and one end of the second bus are respectively connected with a third input end and a third output end of the bidirectional level converter;
one end of the first voltage-stabilizing resistor (R6) is connected with the first bus, and the other end is connected with 485 level; one end of the second voltage-stabilizing resistor (R7) is connected with the second bus, and the other end is connected with 485 levels, and the first voltage-stabilizing resistor (R6) and the second voltage-stabilizing resistor (R7) are used for realizing the stabilization of the bus levels on the first bus and the second bus;
the bidirectional anti-interference circuit and the terminal resistor (R12) are respectively connected between the first bus and the second bus in a bridge mode, and the bidirectional anti-interference circuit is used for preventing surge current on the buses.
5. The multi-mode internet of things smart energy data collection terminal of claim 4, wherein the bidirectional anti-jamming circuit comprises a bidirectional TVS suppression diode, a first voltage dependent resistor (R10) and a second voltage dependent resistor (R11);
one end of the first piezoresistor (R10) is connected with the first bus, and the other end of the first piezoresistor (R10) is grounded; one end of the second piezoresistor (R11) is connected with the second bus, the other end of the second piezoresistor is grounded, and two input ends of the bidirectional TVS suppression diode are respectively connected with the first bus and the second bus, and the output end of the bidirectional TVS suppression diode is grounded.
6. The multi-mode internet of things smart energy data acquisition terminal according to claim 1, wherein the radio frequency communication module comprises a radio frequency chip, a radio frequency impedance matching network and a transceiving switch;
a first input end of the radio frequency chip is connected with a clock control terminal (SCK) of the microprocessor, a second input end of the radio frequency chip is connected with a fourth output end (MISO) of the microprocessor, a third input end of the radio frequency chip is connected with a chip reset terminal (RST) of the microprocessor, a fourth input end of the radio frequency chip is connected with a chip enable terminal (SS) of the microprocessor, a fifth input end of the radio frequency chip is connected with a first output end of the radio frequency impedance matching network, a first output terminal is connected with the second input terminal (MISI) of the microprocessor, a second output terminal is connected with the first switching value input terminal (DIO0) of the microprocessor, a third output terminal is connected with the second switching value input terminal (DIO1) of the microprocessor, a fourth output terminal is connected with the third switching value input terminal (DIO2) of the microprocessor, and a fifth output terminal is connected with the first input terminal of the radio frequency impedance matching network;
the second input end of the radio frequency impedance matching network is connected with the output end of the receiving and transmitting change-over switch, the second output end of the radio frequency impedance matching network is connected with the input end of the receiving and transmitting change-over switch, and the receiving and transmitting change-over switch is further connected with the radio frequency antenna.
7. The multi-mode Internet of things smart energy data acquisition terminal according to claim 1, further comprising an actuator driving circuit and a pulse metering circuit, wherein the actuator driving circuit and the pulse metering circuit are respectively connected with the microprocessor.
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| CN110572887B (en) * | 2019-09-09 | 2022-06-21 | 贵州电网有限责任公司 | Multi-mode wireless communication terminal and communication method thereof |
| CN110638436B (en) * | 2019-09-23 | 2022-03-11 | 重庆医药高等专科学校 | Medical data acquisition system based on single chip microcomputer |
| CN114003540A (en) * | 2021-10-29 | 2022-02-01 | 深圳市信锐网科技术有限公司 | Data acquisition device, method, equipment and computer readable storage medium |
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Application publication date: 20190823 Assignee: Henan Zhuozheng Wisdom IoT Technology Co.,Ltd. Assignor: HENAN ZHUOZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. Contract record no.: X2023980039156 Denomination of invention: A multi-mode IoT smart energy data collection terminal Granted publication date: 20200703 License type: Common License Record date: 20230808 |
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