CN216390997U

CN216390997U - Wireless communication device based on micropower wireless transmission

Info

Publication number: CN216390997U
Application number: CN202122568836.XU
Authority: CN
Inventors: 刘炬; 张文锋
Original assignee: Shenzhen Pemt Electric Measurement Technology Co ltd
Current assignee: Shenzhen Pemt Electric Measurement Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-26
Anticipated expiration: 2031-10-25

Abstract

The utility model provides a wireless communication device based on micropower wireless transmission, and belongs to the field of wireless communication structures. The utility model comprises a shell and a PCB communication mainboard arranged on the shell, wherein the shell is provided with a weak current interface connected with a circuit board, the PCB communication mainboard is provided with a wireless microprocessor module, a wireless radio frequency communication module, a weak current interface circuit module and a power supply conversion module, wherein the wireless microprocessor module is respectively connected with one end of the wireless radio frequency communication module and one end of the weak current interface circuit module, the other end of the weak current interface circuit module is connected with the weak current interface, the power supply conversion module is used for converting the weak current of the weak current interface circuit into the power supply voltage required by the whole device, and the wireless microprocessor module is used for demodulating and mutually converting carrier signals and wireless signals. The utility model has the beneficial effects that: the wireless and carrier dual-mode group communication is realized, and the power communication is more stable.

Description

Wireless communication device based on micropower wireless transmission

Technical Field

The present invention relates to a wireless communication structure, and more particularly, to a wireless communication device based on micro-power wireless transmission.

Background

For a low-voltage distribution network, a plurality of emerging digital technologies greatly improve and improve the availability and reliability of the power carrier communication of the low-voltage distribution network, so that the power carrier communication technology has more attractive application prospect.

However, in the past practical application, single carrier communication has a disadvantage, for example, when a power line is disconnected due to a fault, power failure reporting cannot be effectively performed, so that micro-power wireless communication needs to be equipped for power failure reporting, and in practical application, transmission in a form of wireless networking interconnection and intercommunication can also be performed.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a wireless communication device based on micro-power wireless transmission.

The utility model comprises a shell and a PCB communication mainboard arranged on the shell, wherein the shell is provided with a weak current interface connected with a circuit board, the PCB communication mainboard is provided with a wireless microprocessor module, a wireless radio frequency communication module, a weak current interface circuit module and a power supply conversion module, wherein the wireless microprocessor module is respectively connected with one end of the wireless radio frequency communication module and one end of the weak current interface circuit module, the other end of the weak current interface circuit module is connected with the weak current interface, the power supply conversion module is used for converting the weak current of the weak current interface circuit into the power supply voltage required by the whole device, and the wireless microprocessor module is used for demodulating and mutually converting carrier signals and wireless signals.

The utility model is further improved, the wireless microprocessor module comprises a TF3540 carrier wireless dual-mode MCU chip U1 integrating functions of wireless radio frequency transceiving demodulation and a single chip microcomputer MCU, pins 23 and 24 of the carrier wireless dual-mode MCU chip U1 are connected with a wireless radio frequency communication module and used for communication of wireless signals, and

pins

9 and 40 of the carrier wireless dual-mode MCU chip U1 are connected with communication pins of a weak current interface circuit module and used for communication of carrier signals.

The utility model is further improved, the wireless microprocessor module also comprises a transmitting-receiving signal indicator light, a crystal oscillator module, a memory J4 and a UART serial port J1 which are respectively connected with the carrier wireless dual-mode MCU chip U1.

The utility model is further improved, the weak current interface circuit module includes a switch tube Q1, a switch tube Q2, a resistor R34 and a resistor R35, wherein a D pole of the switch tube Q1 is connected with a MOD _ STA pin 10 of a weak current interface J2, an S pole of the switch tube Q1 is grounded, a G pole is connected with an MCU _ STA pin 11 of the carrier wireless dual-mode MCU chip U1, a D pole of the switch tube Q2 is connected with a MOD _ TXD pin 5 of a weak current interface J2, an S pole of the switch tube Q1 is connected with an MCU _ TXD pin 9 of the carrier wireless dual-mode MCU chip U1, a G pole is connected with a 3.3V power supply, and a MOD _ RXD pin 8 of the weak current interface J2 is connected with an MCU _ RXD pin 40 of the carrier wireless dual-mode MCU chip U1 through a resistor R35 and is connected with the 3.3V power supply through a resistor R34.

The utility model further improves, the wireless radio frequency communication module comprises a balun unit, a frequency selecting unit, a radio frequency transceiving switch and a transceiving control switch, wherein one end of the balun unit is connected with a wireless signal transceiving end of the wireless microprocessor module, the other end of the balun unit is connected with one end of the frequency selecting unit, the other end of the frequency selecting unit is connected with one end of the radio frequency transceiving switch, the other end of the radio frequency transceiving switch is connected with a transceiving antenna ANT1, and the radio frequency transceiving switch is controlled by the wireless microprocessor module to switch between receiving and transmitting.

The present invention is further improved by further comprising a low pass filter unit disposed between the rf transceiver switch and the transceiver antenna ANT 1.

The utility model is further improved, the low-pass filtering unit comprises an inductor L11, an inductor L12, a capacitor C75, a capacitor C76, a capacitor C82 and a capacitor C85, wherein the inductors L11 and L12 are connected in series between the rf transceiving switch and the transceiving antenna ANT1, the capacitor C75 is connected in parallel with the inductor L11, the capacitor C76 is connected in parallel with the inductor L12, one end of the capacitor C85 is connected between the inductor L11 and the inductor L12, the other end of the capacitor C85 is grounded, one end of the capacitor C82 is connected between the inductor L12 and the transceiving antenna ANT1, and the other end of the capacitor C82 is grounded.

The utility model is further improved, the receiving and transmitting control switch comprises a switch chip U6 and a triode Q5, wherein the base electrode of the triode Q5 is respectively connected with the switching control end of the wireless microprocessor module and the VC1 pin 6 of the switch chip U6, the emitter electrode of the triode Q5 is grounded, the collector electrode of the triode Q5 is respectively connected with the VC2 pin 4 of the switch chip U6 and a 3.3V power supply through a resistor, the pin 5 of the switch chip U6 receives a transmitting antenna ANT1, the pin 2 is grounded, and the pins 1 and 3 are connected with the wireless microprocessor module.

The utility model is further improved, the power conversion module comprises a voltage stabilization chip U4 for converting the 12V voltage of the weak current interface circuit module into 3.3V voltage to be output, and an LDO voltage stabilization chip U2 for converting the 3.3V voltage into 1.2V voltage to be output.

The utility model is further improved, the power conversion module further comprises a power failure detection circuit and a super capacitor C52, wherein the power failure detection circuit comprises a voltage dividing resistor R56, a voltage dividing resistor R57 and a switching tube Q3, the drain of the switching tube Q3 is respectively connected with the power failure detection end of the wireless microprocessor module and a 3.3V power supply, the source of the switching tube Q3 is grounded, the grid is connected between the voltage dividing resistors R56 and R57 which are connected in series, the other end of the resistor R57 is grounded, the other end of the resistor R56 is connected with the power supply input end of the power conversion module, the positive electrode of the super capacitor C52 is connected with a charging power supply, the negative electrode of the super capacitor C52 is grounded and connected with a pin 8 of a voltage stabilizing chip U4 through a capacitor C51, and when the power fails, the super capacitor C52 outputs a power failure maintaining voltage to the rear stage.

Compared with the prior art, the utility model has the beneficial effects that: the bidirectional conversion and communication between the wireless signals and the carrier signals are realized, the use is more convenient, when the power line is disconnected due to faults, the power failure report can be effectively carried out through the wireless radio frequency communication module, meanwhile, the communication networking between the devices can also be realized through the wireless radio frequency communication module, thereby realizing the interconnection and intercommunication between the devices, and providing infinite possibility for the function expansion of the communication terminal in the circuit information system.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of a wireless microprocessor module;

FIG. 3 is a schematic diagram of a weak current interface circuit;

FIG. 4 is a schematic circuit diagram of a power module;

fig. 5 is a schematic diagram of a wireless rf low-pass circuit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

No matter the electricity consumption information acquisition system of the national power grid power users or the southern power grid low-voltage centralized meter reading system, the last kilometer communication technology mainly adopts the power line carrier communication technology. With the continuous expansion of the power grid company service, on the basis of the original system function, a plurality of new deepened application functions are expanded, such as: high-frequency acquisition, asset management, phase identification, phase sequence identification, household variable relation identification, power failure event reporting, multi-table centralized reading and the like. Particularly, the power failure event reporting function can inform the power supply company of relevant personnel at the first time after the power failure of the user, so that the power supply enterprise can realize rapid and active rush repair, and the power supply service quality is improved. After the power failure of the function, the power line carrier communication channel is disconnected, and the power failure event cannot be reported reliably, so that another communication technology is needed for supplement, and the best mode is wireless communication. The utility model therefore focuses on increasing the functionality of this block of micro-power wireless communication. The communication networking between the devices can be realized through wireless communication, and then the interconnection and intercommunication between the devices are realized, and infinite possibility is provided for the function expansion of the communication terminal in the circuit information system.

As shown in figure 1, the utility model comprises a shell and a PCB communication mainboard arranged on the shell, wherein the shell is provided with a weak current interface connected with a circuit board, the PCB communication mainboard is provided with a wireless microprocessor module, a wireless radio frequency communication module, a weak current interface circuit module and a power supply conversion module, wherein the wireless microprocessor module is respectively connected with one end of the wireless radio frequency communication module and one end of the weak current interface circuit module, the other end of the weak current interface circuit module is connected with the weak current interface, the power supply conversion module is used for converting the weak current of the weak current interface circuit into the power supply voltage required by the whole device, the wireless microprocessor module is used for demodulating and mutually converting carrier signals and wireless signals, converting the wireless radio frequency signals of a personal communication terminal into carrier signals and transmitting the carrier signals to a certain intelligent meter through the weak current interface, thereby realizing the data reading, data reading and data conversion of the intelligent meter, Remote control, etc.

As shown in fig. 2, the wireless microprocessor module of this embodiment includes a TF3540 carrier wireless dual-mode MCU chip U1, which is a core chip device of the whole device, integrating functions of wireless radio frequency transceiving and demodulation and a single-chip MCU. Pins 23 and 24 of the carrier wireless dual-mode MCU chip U1 are connected with a wireless radio frequency communication module for communication of wireless signals, and

pins

9 and 40 of the carrier wireless dual-mode MCU chip U1 are connected with communication pins of the weak current interface circuit module for communication of carrier signals. The wireless microprocessor module also comprises a transmitting-receiving signal indicator lamp D1, a transmitting-receiving signal indicator lamp D2, a crystal oscillator X1, a memory J4, a UART serial port J1 and the like which are respectively connected with the carrier wireless dual-mode MCU chip U1.

The carrier wireless dual-mode MCU chip U1 can store the demodulated signal in a memory J4, so that the personal communication terminal can be conveniently obtained, and can demodulate the wireless signal communicated with the personal communication terminal of the embodiment through a wireless radio frequency communication module, realize wireless communication with other personal communication terminals, demodulate and convert the wireless radio frequency signal into a carrier signal, send the carrier signal to a strong electric interface through the existing carrier signal communication module, transmit the carrier signal to a remote client through a cable, and transmit the carrier signal to an intelligent meter connected with a weak electric interface through a weak electric interface circuit. In addition, the carrier signal received by the intelligent meter or the strong electric interface can be demodulated and converted into a wireless signal and sent to the personal communication terminal. Therefore, the user electricity consumption data can be effectively collected and counted in time in any state.

As shown in fig. 3, the weak current interface circuit module is connected to a weak current interface J2, and is mainly used for transmitting to a certain intelligent meter for collection and interconnection, and also for supplying power to the whole 12V of the module.

The weak current interface circuit module of the embodiment comprises a switching tube Q1, a switching tube Q2, a resistor R34 and a resistor R35, wherein a D pole of the switching tube Q1 is connected with an MOD _ STA pin 10 of a weak current interface J2, an S pole of the switching tube Q1 is grounded, a G pole of the switching tube Q1 is connected with an MCU _ STA pin 11 of the wireless dual-mode MCU chip U1, a D pole of the switching tube Q2 is connected with an MOD _ TXD pin 5 of a weak current interface J2, an S pole of the switching tube Q1 is connected with an MCU _ TXD pin 9 of the wireless dual-mode MCU chip U1, a G pole of the switching tube Q1 is connected with a 3.3V power supply, and an MOD _ RXD pin 8 of the weak current interface J2 is connected with an MCU _ RXDD pin 40 of the wireless dual-mode MCU chip U1 through a resistor R35 and is connected with a 3.3V power supply through a resistor R34.

As shown in fig. 4, the power conversion module of this embodiment includes a voltage stabilizing chip U4, which is used to convert the 12V voltage of the weak current interface circuit module into a 3.3V voltage for the complete machine to work. The LDO voltage stabilizing chip U2 is used for converting the 3.3V voltage into a 1.2V voltage to be output.

Preferably, the power conversion module further includes a power failure detection circuit and a super capacitor C52, wherein the power failure detection circuit includes a voltage dividing resistor R56, R57, a switch tube Q3, the drain of the switch tube Q3 is respectively connected to the power failure detection end of the wireless microprocessor module and the 3.3V power supply, the source of the switch tube Q3 is grounded, the gate is connected between the voltage dividing resistors R56 and R57 connected in series, the other end of the resistor R57 is grounded, the other end of the resistor R56 is connected to the power input end of the power conversion module, the positive electrode of the super capacitor C52 is connected to the charging power supply, the negative electrode of the super capacitor C52 is grounded and connected to the pin 8 of the voltage stabilizing chip U4 through a capacitor C51, and when the power failure occurs, the super capacitor C52 outputs a power failure maintaining voltage to the rear stage.

According to the utility model, a power failure detection circuit is additionally arranged, voltage is divided by resistors R56 and R57, and then the power failure detection circuit is controlled by a switching tube Q3, a MCU _12V detection signal pin is connected with a pin 17 of a carrier wireless dual-mode MCU chip U1 to carry out power failure detection, when 12V is powered down, the carrier wireless dual-mode MCU chip U1 can recognize the power failure in time and then report the power failure, and meanwhile, a super capacitor C52 of the power failure detection circuit can play a role in maintaining a power supply source for about 95 seconds after the power failure. Therefore, the device can store the data in time, prevent the data from being lost and facilitate the realization of the power failure reporting function.

As shown in fig. 5, the wireless rf communication module of this embodiment includes a balun unit, a frequency selecting unit, a rf transceiving switch, and a transceiving control switch, wherein the balun unit includes a capacitor C86, an inductor L18, a capacitor C77, and an inductor L13, one end of the balun unit is connected to a wireless signal transmitting end of the wireless microprocessor module, the other end of the balun unit is connected to one end of the frequency selecting unit including a capacitor C78, an inductor L17, a capacitor C89, an inductor L9, and a capacitor C81, the other end of the frequency selecting unit is connected to one end of the rf transceiving switch, the other end of the rf transceiving switch is connected to a transceiving antenna ANT1, and the rf transceiving switch is controlled by the wireless microprocessor module to switch between receiving and transmitting. And a low pass filtering unit arranged between the rf transceiving switch and the transceiving antenna ANT 1.

The low-pass filtering unit comprises an inductor L11, an inductor L12, capacitors C75, C76, C82 and C85, wherein the inductors L11 and L12 are connected in series between the radio frequency transceiving switch and the transceiving antenna ANT1, the capacitor C75 is connected in parallel with the inductor L11, the capacitor C76 is connected in parallel with the inductor L12, one end of the capacitor C85 is connected between the inductor L11 and the inductor L12, the other end of the capacitor C85 is grounded, one end of the capacitor C82 is connected between the inductor L12 and the transceiving antenna ANT1, and the other end of the capacitor C82 is grounded.

The transceiving control switch comprises a switch chip U6 and a triode Q5, wherein the base electrode of the triode Q5 is respectively connected with the switching control end of the wireless microprocessor module and the VC1 pin 6 of the switch chip U6, the emitting electrode of the triode Q5 is grounded, the collector electrode of the triode Q5 is respectively connected with the VC2 pin 4 of the switch chip U6 and a 3.3V power supply through a resistor, the pin 5 of the switch chip U6 receives a transmitting antenna ANT1, the pin 2 is grounded, and the pins 1 and 3 are connected with the wireless microprocessor module.

The working principle of the embodiment is as follows: the wireless transmitting signal is an RF _ OP and RF _ ON signal output by a carrier wireless dual-mode MCU chip U1, passes through a balun circuit and a frequency selection circuit, then passes through low-pass filter circuits L11 and L12 and C75, C76, C85 and C82 to filter out clutter such as second harmonic, third harmonic and the like, and then is transmitted out through a transmitting-receiving antenna ANT 1; when receiving the radio frequency signal, the transceiving antenna ANT1 filters the radio frequency signal through the low pass filter circuit, inputs the radio frequency signal to the switch chip U6, and outputs the radio frequency signal to the radio frequency signal receiving terminal of the carrier wireless dual-mode MCU chip U1 through the pin 1 of the switch chip U6. The U6(PE4259) is a radio frequency transceiving switch, and a triode Q5 is controlled by the U1 to realize the switching of a VC1 power supply or a VC2 power supply, so that the receiving or sending switching of signals is realized.

The power consumption of the whole machine is less than or equal to 0.4W in a static state and less than or equal to 1.5W in a dynamic state, wireless signal receiving and transmitting within the frequency range of 470MHz-510MHz are met, the transmitting function is not more than 20dBm, the performance of the whole machine is stable, and the power consumption is low.

The utility model can realize bidirectional conversion and communication between wireless signals and carrier signals, is more convenient to use, and can effectively report power failure and the like through the wireless radio frequency communication module when the power line is disconnected due to faults, so that the whole power system can run more stably.

The above-described embodiments are intended to be illustrative, and not restrictive, of the utility model, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A wireless communication apparatus based on micropower wireless transmission, characterized in that: including casing and the PCB communication mainboard of setting on the casing, be equipped with the weak current interface that links to each other with the circuit board on the casing, be equipped with wireless microprocessor module, wireless radio frequency communication module, weak current interface circuit module and power conversion module on the PCB communication mainboard, wherein, wireless microprocessor module links to each other with the one end of wireless radio frequency communication module and weak current interface circuit module respectively, the other end of weak current interface circuit module links to each other with the weak current interface, power conversion module is used for converting the weak current of weak current interface circuit into the mains voltage that whole device needs, wireless microprocessor module is used for carrier signal and radio signal's demodulation and interconversion.

2. The micropower wireless transmission-based wireless communication apparatus of claim 1, wherein: the wireless microprocessor module comprises a TF3540 carrier wireless dual-mode MCU chip U1 integrating functions of wireless radio frequency transceiving demodulation and a single chip microcomputer MCU, pins 23 and 24 of the carrier wireless dual-mode MCU chip U1 are connected with a wireless radio frequency communication module and used for communication of wireless signals, and pins 9 and 40 of the carrier wireless dual-mode MCU chip U1 are connected with communication pins of the weak current interface circuit module and used for communication of carrier signals.

3. The micropower wireless transmission-based wireless communication apparatus of claim 2, wherein: the wireless microprocessor module also comprises a transmitting-receiving signal indicator light, a crystal oscillator module, a memory J4 and a UART serial port J1 which are respectively connected with the carrier wireless dual-mode MCU chip U1.

4. The micropower wireless transmission-based wireless communication apparatus of claim 2, wherein: the weak current interface circuit module comprises a switch tube Q1, a switch tube Q2, a resistor R34 and a resistor R35, wherein the D pole of the switch tube Q1 is connected with an MOD _ STA pin 10 of a weak current interface J2, the S pole of the switch tube Q1 is grounded, the G pole of the switch tube Q1 is connected with an MCU _ STA pin 11 of the wireless dual-mode MCU chip U1, the D pole of the switch tube Q2 is connected with an MOD _ TXD pin 5 of a weak current interface J2, the S pole of the switch tube Q1 is connected with an MCU _ TXD pin 9 of the wireless dual-mode MCU chip U1, the G pole of the switch tube Q2 is connected with a 3.3V power supply, and the MOD _ RXD pin 8 of the weak current interface J2 is connected with an MCU _ RXD pin 40 of the wireless dual-mode MCU chip U1 through a resistor R35 and is connected with the 3.3V power supply through a resistor R34.

5. The micropower wireless transmission-based wireless communication device of any one of claims 1-4, wherein: the wireless radio frequency communication module comprises a balun unit, a frequency selection unit, a radio frequency transceiving switch and a transceiving control switch, wherein one end of the balun unit is connected with a wireless signal transceiving end of the wireless microprocessor module, the other end of the balun unit is connected with one end of the frequency selection unit, the other end of the frequency selection unit is connected with one end of the radio frequency transceiving switch, the other end of the radio frequency transceiving switch is connected with a transceiving antenna ANT1, and the radio frequency transceiving switch is controlled by the wireless microprocessor module to switch receiving and transmitting.

6. The micropower wireless transmission-based wireless communication apparatus of claim 5, wherein: and a low pass filtering unit arranged between the rf transceiving switch and the transceiving antenna ANT 1.

7. The micropower wireless transmission-based wireless communication apparatus of claim 6, wherein: the low-pass filtering unit comprises an inductor L11, an inductor L12, capacitors C75, C76, C82 and C85, wherein the inductors L11 and L12 are connected in series between the radio frequency transceiving switch and the transceiving antenna ANT1, the capacitor C75 is connected in parallel with the inductor L11, the capacitor C76 is connected in parallel with the inductor L12, one end of the capacitor C85 is connected between the inductor L11 and the inductor L12, the other end of the capacitor C85 is grounded, one end of the capacitor C82 is connected between the inductor L12 and the transceiving antenna ANT1, and the other end of the capacitor C82 is grounded.

8. The micropower wireless transmission-based wireless communication apparatus of claim 5, wherein: the receiving and transmitting control switch comprises a switch chip U6 and a triode Q5, wherein the base electrode of the triode Q5 is respectively connected with the switching control end of the wireless microprocessor module and the VC1 pin 6 of the switch chip U6, the emitting electrode of the triode Q5 is grounded, the collecting electrode is respectively connected with the VC2 pin 4 of the switch chip U6 and is connected with a 3.3V power supply through a resistor, the pin 5 of the switch chip U6 receives a transmitting antenna ANT1, the pin 2 is grounded, and the pins 1 and 3 are connected with the wireless microprocessor module.

9. The micropower wireless transmission-based wireless communication device of any one of claims 1-4, wherein: the power conversion module comprises a voltage stabilization chip U4 and an LDO voltage stabilization chip U2, wherein the voltage stabilization chip U4 is used for converting 12V voltage of the weak current interface circuit module into 3.3V voltage output, and the LDO voltage stabilization chip U2 is used for converting 3.3V voltage into 1.2V voltage output.

10. The micropower wireless transmission-based wireless communication apparatus of claim 9, wherein: the power conversion module still includes power failure detection circuit and super capacitor C52, wherein, power failure detection circuit includes divider resistor R56, R57, switch tube Q3, the drain electrode of switch tube Q3 connects the power failure detection end and the 3.3V power of wireless microprocessor module respectively, switch tube Q3's source ground, the grid connects between divider resistor R56, the R57 of series connection, and resistance R57's other end ground connection, R56's another termination power conversion module's power input end, super capacitor C52's positive pole connects charging power supply, negative pole ground connection to pin 8 through electric capacity C51 and voltage stabilizing chip U4 links to each other, during the power failure, super capacitor C52 exports power failure maintenance voltage and gives the back level.