CN218276958U

CN218276958U - Miniature wireless concentrator

Info

Publication number: CN218276958U
Application number: CN202222091554.XU
Authority: CN
Inventors: 刘伟; 王世沛
Original assignee: Galaxy Power Group Co ltd
Current assignee: Galaxy Power Group Co ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2023-01-10
Anticipated expiration: 2032-08-09

Abstract

The utility model discloses a micro wireless concentrator, which comprises a USB interface, a power supply conversion circuit, a USB conversion circuit, a main control circuit and a radio frequency circuit; the USB interface, the power conversion circuit, the USB conversion circuit, the main control circuit and the radio frequency circuit form a miniature wireless concentrator circuit, when meter reading is needed, only the USB interface is needed to be connected with terminal equipment such as a mobile phone or a PC, the terminal equipment supplies power for the wireless concentrator circuit and realizes data interaction with the main control circuit, data interaction is carried out with an instrument to be subjected to meter reading through the radio frequency circuit, corresponding data are further transmitted to the terminal equipment through the main control circuit, corresponding data are displayed on the terminal equipment, centralized meter reading of the instrument in an area is realized, the wireless concentrator does not need to be additionally provided with a power supply system, the wireless concentrator is directly supplied with power for use through the terminal equipment, the volume of the equipment is reduced, and the wireless concentrator is more convenient to carry.

Description

Miniature wireless concentrator

Technical Field

The utility model relates to an instrument and meter technical field especially relates to a miniature wireless concentrator.

Background

When a user side reads the intelligent wireless electric meter, the user display unit is usually adopted to read the meter. In consideration of the acceptable cost of users, the user display unit is usually composed of a simple liquid crystal display screen and a main control chip with simpler functions. Although a point-to-point meter reading mode can be realized, centralized reading cannot be realized.

Therefore, a palm machine (i.e. an industrial mobile phone) integrated wireless module with more powerful functions is required to be used for centralized meter reading of the smart meters in a certain area. But palm pilots are expensive and are highly customized products. Meanwhile, the updating cost is very high, so that the software and hardware of the mobile phone are often behind the smart phone, and the mobile phone cannot carry the updated application. Hardware resources are gradually unable to keep up with the software replacement, and are difficult to adapt to the ever-changing market.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the miniature wireless concentrator is matched with terminal equipment to realize the function of centralized meter reading in an area.

In order to solve the technical problem, the utility model discloses a technical scheme be:

a micro wireless hub comprises a USB interface, a power supply conversion circuit, a USB conversion circuit, a main control circuit and a radio frequency circuit;

the output end of the power supply conversion circuit is respectively connected with the power supply input end of the main control circuit and the power supply input end of the radio frequency circuit, and the input end of the power supply conversion circuit is connected with the USB interface;

the data transmission end of the USB conversion circuit is connected with the first data transmission end of the main control circuit, and the input end of the USB conversion circuit is connected with the USB interface;

and the data transmission end of the radio frequency circuit is connected with the second data transmission end of the main control circuit.

Further, the USB conversion circuit comprises a USB conversion chip;

a power supply pin of the USB conversion chip is connected with a power supply access end of the USB interface;

the differential signal transmission end of the USB conversion chip is connected with the differential signal transmission end of the USB interface;

and the data transmission end of the USB conversion chip is connected with the first data transmission end of the main control circuit.

Further, the USB conversion circuit further comprises a first resistor and a second resistor;

one end of the first resistor and one end of the second resistor are both connected with the differential signal transmission end of the USB conversion chip, and the other end of the first resistor and the second resistor are connected with the differential signal transmission end of the USB interface.

Further, the main control circuit comprises a main control chip and a light emitting diode;

a first control pin of the main control chip is connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is grounded;

a second control pin of the main control chip is connected with an enabling input end of the radio frequency circuit;

the power supply input end of the main control chip is connected with the output end of the power supply conversion circuit;

the first data transmission end of the main control chip is connected with the data transmission end of the USB conversion circuit;

and the second data transmission end of the main control chip is connected with the data transmission end of the radio frequency circuit.

Furthermore, the device also comprises a current limiting resistor;

one end of the current-limiting resistor is connected with the data transmission end of the USB conversion circuit, and the other end of the current-limiting resistor is connected with the first data transmission end of the main control circuit.

Further, the device also comprises a storage circuit;

the data transmission end of the storage circuit is connected with the third data transmission end of the main control circuit;

and the control input end of the storage circuit is connected with the third control output end of the main control circuit.

Furthermore, the USB interface, the power conversion circuit, the USB conversion circuit, the main control circuit and the radio frequency circuit are integrated in a pluggable USB mould.

The beneficial effects of the utility model reside in that: the USB interface, the power conversion circuit, the USB conversion circuit, the main control circuit and the radio frequency circuit form a miniature wireless concentrator circuit, when meter reading is needed, only the USB interface is needed to be connected with terminal equipment such as a mobile phone or a PC, the terminal equipment supplies power for the wireless concentrator circuit and realizes data interaction with the main control circuit, data interaction is carried out with an instrument to be subjected to meter reading through the radio frequency circuit, corresponding data are further transmitted to the terminal equipment through the main control circuit, corresponding data are displayed on the terminal equipment, centralized meter reading of the instrument in an area is realized, the wireless concentrator does not need to be additionally provided with a power supply system, the wireless concentrator is directly supplied with power for use through the terminal equipment, the volume of the equipment is reduced, and the wireless concentrator is more convenient to carry.

Drawings

Fig. 1 is a schematic diagram of a circuit module of a micro wireless hub according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a USB conversion circuit of a micro wireless hub according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a main control circuit of a micro wireless hub according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a memory circuit structure of a micro wireless hub according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a radio frequency circuit of a micro wireless hub according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a micro wireless hub according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an application of a micro wireless hub according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a micro wireless hub applied to a meter reading scene in an embodiment of the present invention;

description of the reference symbols:

1. a USB interface; 2. a power conversion circuit; 3. a USB conversion circuit; 4. a master control circuit; 5. a radio frequency circuit; 6. a storage circuit; u11 and a USB conversion chip; u12 and a main control chip; u14 and a storage chip; m1, a radio frequency chip; r35 and a first resistor; r36 and a second resistor; r21 and a third resistor; r22 and a fourth resistor; LED0, light emitting diode.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1, a micro wireless hub includes a USB interface, a power conversion circuit, a USB conversion circuit, a main control circuit, and a radio frequency circuit;

As can be seen from the above description, the utility model has the advantages that: the USB interface, the power conversion circuit, the USB conversion circuit, the main control circuit and the radio frequency circuit form a miniature wireless concentrator circuit, when meter reading is needed, only the USB interface is needed to be connected with terminal equipment such as a mobile phone or a PC, the terminal equipment supplies power for the wireless concentrator circuit and realizes data interaction with the main control circuit, data interaction is carried out with an instrument to be subjected to meter reading through the radio frequency circuit, corresponding data are further transmitted to the terminal equipment through the main control circuit, corresponding data are displayed on the terminal equipment, centralized meter reading of the instrument in an area is realized, the wireless concentrator does not need to be additionally provided with a power supply system, the wireless concentrator is directly supplied with power for use through the terminal equipment, the volume of the equipment is reduced, and the wireless concentrator is more convenient to carry.

Further, the USB conversion circuit comprises a USB conversion chip;

As can be seen from the above description, the USB conversion chip is used as the USB conversion circuit, and the differential levels of the interfaces such as the USB of the PC type, the USB of the TPYE-C type and the USB of the Micro type can be converted into the TTL levels, so as to implement communication between the terminal and the control circuit.

According to the above description, the first resistor and the second resistor are added and are respectively connected in series between the differential signal transmission end of the USB conversion chip and the differential signal transmission end of the USB interface, so as to play a role in limiting current, limit surge current generated during hot plug of the USB interface, and improve the stability of the USB conversion circuit.

As can be seen from the above description, by providing the light emitting diode and connecting the light emitting diode with the control pin of the main control chip, the current operating state of the main control circuit can be represented by different lighting states of the light emitting diode.

Furthermore, the device also comprises a current limiting resistor;

As can be seen from the above description, by providing the current-limiting resistor between the data transmission terminal of the USB conversion circuit and the first data transmission terminal of the main control circuit, the situation that one end of the USB conversion circuit or the main control circuit is burned down due to the abnormal power supply at the other end can be prevented, and the reliability of the circuit can be improved.

Further, the device also comprises a storage circuit;

As can be seen from the above description, by providing the storage circuit and connecting the control input terminal with the control terminal of the main control circuit, when data storage is required, the storage circuit is controlled by the main control circuit to enter a data storage state, and when data reading is required, the storage circuit is controlled to return data to the main control circuit, so that data storage and data reading are realized.

According to the description, the USB interface, the power conversion circuit, the USB conversion circuit, the main control circuit and the radio frequency circuit are integrated in the pluggable USB mould, the size of the whole micro wireless concentrator is only the size of one USB flash disk, and the miniature wireless concentrator has the advantages of being small in size, light and easy to carry, and is more convenient for users to use.

In this embodiment, the micro wireless hub may be suitable for reading meters, such as public water meters, electric meters, gas meters, heat meters, and the like, and is described below by using specific embodiments:

example one

Referring to fig. 1, a micro wireless hub includes a USB interface 1, a power conversion circuit 2, a USB conversion circuit 3, a main control circuit 4, a radio frequency circuit 5, and a storage circuit 6; in an alternative embodiment, the power conversion circuit 2 is a Low Dropout linear Regulator (LDR); the Memory circuit 6 is a Ferroelectric Random Access Memory (FRAM); the FRAM has a storage speed higher than that of a common Flash, the SCK clock is as high as 16MHz, radio frequency information is mainly stored, rapid frequency hopping is realized, the wireless response speed is higher, and the communication efficiency of the whole communication system is higher; the radio frequency circuit 5 mainly realizes radio frequency receiving and transmitting and realizes interaction of air data;

the output end of the power conversion circuit 2 is respectively connected with the power input end of the main control circuit 4 and the power input end of the radio frequency circuit 5, and the input end of the power conversion circuit 2 is connected with the USB interface 1; the data transmission end of the USB conversion circuit 3 is connected with the first data transmission end of the main control circuit 4, and the input end of the USB conversion circuit 3 is connected with the USB interface 1; the data transmission end of the radio frequency circuit 5 is connected with the second data transmission end of the main control circuit 4; the data transmission end of the storage circuit 6 is connected with the third data transmission end of the main control circuit 4; the control input end of the storage circuit 6 is connected with the third control output end of the main control circuit 4;

referring to fig. 2 to 5, in an alternative embodiment, the USB conversion circuit 3 includes a USB conversion chip U11, whose type is CP2104; the main control circuit 4 comprises a main control chip U12, the model number of which is R7F0C901B; the storage circuit 6 comprises a storage chip U14, the type number of which is MB85RS512T; the radio frequency circuit 5 comprises a radio frequency chip M1 with the model number of WL-301;

a power supply pin (VBUS) of the USB conversion chip U11 is connected with a power supply access end (VBUS) of the USB interface 1; the differential signal transmission end (D- & D +) of the USB conversion chip U11 is connected with the differential signal transmission end (D- & D +) of the USB interface 1; the USB conversion circuit 3 further includes a first resistor R35 and a second resistor R36; one end of each of the first resistor R35 and the second resistor R36 is connected to the differential signal transmission end of the USB conversion chip U11, and the other end of each of the first resistor R35 and the second resistor R36 is connected to the differential signal transmission end of the USB interface 1; the data transmission terminal (TXT/RXT) of the USB conversion chip U11 is connected with the first data transmission terminal (TXD 1/RXD 1) of the main control circuit 4; a current limiting resistor is arranged between the USB conversion chip U11 and the main control chip U12, and the current limiting resistor comprises a third resistor R21 and a fourth resistor R22; the third resistor R21 and the fourth resistor R22 are respectively arranged between a TXT pin of the USB conversion chip U11 and an RXD1 pin of the main control chip U12, and between an RXT pin of the USB conversion chip U11 and the TXD1 pin of the main control chip U12;

a first control pin (P10) of the main control chip U12 is connected with the anode of the light-emitting diode LED0, and the cathode of the light-emitting diode LED0 is grounded; the light emitting diode LED0 is used for indicating the working state of the main control circuit 4, if the light emitting diode LED is normally on, the normal operation is indicated, and the data interaction is indicated by the flashing; a second control pin (P17/TXD 0) of the main control chip U12 is connected with an enabling input End (EN) of the radio frequency circuit 5; the power supply input end (VDD) of the main control chip U12 is connected with the output end of the power supply conversion circuit 2; pins 18, 19, 20 and 21 of the main control chip U12 are respectively connected with 100 ohm resistors and then connected with

pins

6, 5, 4, 3 and 2 of the storage chip U14, so that the stability of signal transmission is enhanced;

the second data transmission end of the main control chip U12 is connected to the data transmission end of the radio frequency circuit 5, specifically: pins 12, 13, 14, 15 and 16 of the main control chip U12 are respectively connected with pins 6, 5, 4, 3 and 2 of the radio frequency chip M1, wherein the pins 6 and 5 of the radio frequency chip M1 are digital signal input and output ports, can configure a register test mode of the radio frequency chip M1, and form a closed loop with a vector signal generator to test an error rate and a receiving sensitivity; pins 4, 3 and 2 of the radio frequency chip M1 are three-wire SPI interfaces and are mainly used for configuring a register of the radio frequency chip M1; the 14 th pin is a power supply enable of the radio frequency chip M1, and if the radio frequency chip M1 is halted, the radio frequency chip M1 can be restarted by pulling down the 14 th pin; the radio frequency chip M1 works in a 433MHz frequency band, the signal intensity is 0-20dBm and can be adjusted, the radio frequency chip only works in the 433M frequency band, the cost is low, and the communication distance is longer due to the low working frequency band; in the aspect of hardware, a radio frequency module power register is arranged through an SPI (serial peripheral interface) to realize that the transmitting power is adjustable from 0dBm to 20 dBm; the application layer is provided with an interface for the setting of upper computer software (such as SmartRF Studio);

the principle of the miniature wireless hub is as follows:

miniature wireless concentrator passes through USB interface 1 is connected the back with terminal equipment, power conversion circuit 2 passes through the terminal the power of USB interface 1 turns into 3.3V piezoelectricity, does master control circuit 4 and radio frequency circuit 5 power supply pass through simultaneously USB conversion circuit 3 with the software control information in the terminal send to master control circuit 4, master control circuit 4 further control radio frequency circuit 5 transmitting signal or received signal, storage circuit 6 is in store or upload data under master control circuit 4's the control, realize concentrating the collection to the ammeter in the region to show data on terminal equipment.

Example two

Please refer to fig. 6, which is a schematic structural diagram of a micro wireless hub; the USB interface 1, the power conversion circuit 2, the USB conversion circuit 3, the main control circuit 4, the radio frequency circuit 5 and the storage circuit 6 are all integrated in a pluggable USB mould; it is small in size, only one U-disk size (70 x 27 x 8 mm); the adaptive rod antenna can reach a working distance of more than 200 meters, and the adaptive sucker antenna can reach a communication distance of hundreds of meters to 1 kilometer; in an alternative embodiment, the antenna is arranged at the other end of the USB mold interface; the interface shape supports standard USB2.0 and USB3.0; a USB-to-TTL (Transistor-Transistor Logic) chip is built in the USB plug-and-play device; the PC end can use PC end management software to carry out reading, setting and other management operations on the user node; at a mobile terminal (a mobile phone, a PAD, and The like), a mobile terminal APP can be used, and The mobile device is connected through an OTG (On-The-Go) to manage a user node, wherein The OTG is applied to different devices or connection among The mobile devices for data exchange;

referring to fig. 7, a specific method of using the micro wireless hub is as follows:

when being applied to a computer terminal: inserting the hardware of the micro wireless hub into a computer, installing a USB-to-TTL driver CP2104 (USB conversion chip) and a SmartRF Studio, entering a UN < - > DN mode (user node < - > distributed node mode), and automatically finding the micro wireless hub inserted into the computer and synchronizing the micro wireless hub by the SmartRF Studio through polling a serial port tree and trying to synchronize, and distributing random serial numbers for the micro wireless hub; the meter number file is led into SmartRF Studio, and data such as electric quantity, current and the like needing to be read can be selected according to an ammeter protocol; if the ammeter in the region does not know the meter number, the ammeter in the region can also search the meter number in the range of hundreds of meters around through an automatic search mode set by SmartRF Studio, and the meter number is imported into an archive for reading;

the method is applied to the mobile phone end: the hardware of the micro wireless hub is inserted into a mobile phone through an OTG patch cord, and a SmartRF Studio mobile terminal APP is installed, so that meter reading can be realized in the manner;

the meter reading function implementation mode comprises the following steps: referring to fig. 8, in the present embodiment, in use, a user node is defined as UN, and a distributable node is DN (i.e., a wireless module of an electric meter) to perform one-to-one or one-to-many interaction; adding the meter number of a single meter or the meter number files of a plurality of meters before meter reading; broadcasting signals to the air through a downlink channel during meter reading, taking a meter number and an encryption protocol code as unique identification codes, responding according to different meter reading instructions when corresponding meter numbers receive the broadcast signals, and distinguishing uplink and downlink channels through uplink channel response to ensure that the uplink and downlink channels are smooth when the number of meters is large;

the device searching function implementation principle is as follows: if the conditions of unknown meter number, meter specific installation position, meter radio frequency parameter setting error and the like are met on site, the function meter reading can be searched through equipment; when the equipment searching function is used, the micro wireless hub sends out full-channel broadcast, one broadcast round can be judged according to the returned RSSI (signal strength indicator) value, and a table with low signal strength can be broadcasted for several rounds again, so that relatively stable handshake is achieved; after several rounds of broadcasting, parameters such as nearby table numbers, signal strength, channels and the like are acquired and compared with the original file, and the new table numbers are added into the file.

The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims

1. A micro wireless hub is characterized by comprising a USB interface, a power conversion circuit, a USB conversion circuit, a main control circuit and a radio frequency circuit;

2. The micro wireless hub according to claim 1, wherein the USB conversion circuit comprises a USB conversion chip;

the power pin of the USB conversion chip is connected with the power access end of the USB interface;

3. The micro wireless hub of claim 2, wherein the USB switching circuit further comprises a first resistor and a second resistor;

4. The micro wireless hub according to claim 1, wherein the master control circuit comprises a master control chip and a light emitting diode;

5. The micro wireless hub according to claim 1, further comprising a current limiting resistor;

6. The micro wireless hub of claim 1, further comprising a memory circuit;

7. The micro wireless hub according to claim 1, wherein the USB interface, the power conversion circuit, the USB conversion circuit, the host circuit and the rf circuit are integrated in a pluggable USB module.