CN219960851U

CN219960851U - Measuring switch based on Bluetooth communication

Info

Publication number: CN219960851U
Application number: CN202320117430.6U
Authority: CN
Inventors: 李建
Original assignee: Shenzhen Tengming Technology Co ltd
Current assignee: Shenzhen Tengming Technology Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-11-03
Anticipated expiration: 2033-02-06

Abstract

The utility model provides a measuring switch based on Bluetooth communication, and belongs to the technical field of power communication. The intelligent control system comprises a Bluetooth communication channel, a two-way 485 communication channel, electric energy metering, short-circuit instantaneous protection, an MCU data processing circuit, a temperature monitoring control circuit and an RTC time real-time clock circuit. The MCU data processing circuit is respectively connected with the Bluetooth communication channel, the two-way 485 communication channel, the electric energy metering, the short-circuit instantaneous protection, the temperature monitoring control circuit and the RTC time clock circuit. According to the utility model, the uplink communication interacts with the cloud server in a Bluetooth mode, and the downlink communication interacts with the switch sub-equipment in an RS485 mode, so that the intelligent watch searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and other functions are realized; high reliability and convenient installation.

Description

Measuring switch based on Bluetooth communication

Technical Field

The utility model provides a measuring switch based on Bluetooth communication, and belongs to the technical field of power communication.

Background

The information disclosed in the background of the utility model is only for enhancement of understanding of the general background of the utility model and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Along with the development of smart power grids, the application requirements of the measurement switch are also increased, and thus, the requirements are matched with the intelligent control. The measuring switch is an intelligent collector with edge computing capability, and is matched with intelligent switching equipment (such as a circuit breaker, a photovoltaic grid-connected switch, a leakage reclosing and other series products) for use; the uplink communication interacts with the cloud server in a Bluetooth mode, and the downlink communication interacts with the switch sub-equipment in an RS485 mode, so that the intelligent watch searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and other functions are realized; high reliability and convenient installation.

Disclosure of Invention

According to the Bluetooth communication-based measuring switch provided by the utility model, the Bluetooth mode is used for interacting with the cloud server in uplink communication, the RS485 mode is used for interacting with the switch sub-equipment in downlink communication, and the Bluetooth communication-based measuring switch has the functions of intelligent meter searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and the like; high reliability and convenient installation.

The utility model provides a measurement switch based on Bluetooth communication, which comprises a Bluetooth communication channel, a two-way 485 communication channel, an electric energy metering, short-circuit instantaneous protection, an MCU data processing circuit, a temperature monitoring control circuit and an RTC time real-time clock circuit, wherein the MCU data processing circuit is respectively connected with the Bluetooth communication channel, the two-way 485 communication channel, the electric energy metering, the short-circuit instantaneous protection, the temperature monitoring control circuit and the RTC time real-time clock circuit.

The system also comprises an AC inlet surge protection circuit and an AC-DC power supply module, wherein the AC is converted into a double-path DC12V, and one path of the AC is converted into a 3.3V DC-DC circuit.

The MCU data processing circuit uses U5 as a main chip to process, the chip adopts 3.3V power supply, and a clock circuit, a reset circuit, a power failure detection circuit and a power supply filter circuit are arranged on the periphery of the chip.

The two-way 485 communication channel is isolated by adopting an optocoupler, and UART communication between the 485 channel and the MCU is isolated by the optocoupler chip.

The Bluetooth communication channel is a low-power consumption module, and the power supply is 3.3V-4.2V.

The electric energy meter comprises an MCU chip, and is characterized by further comprising a storage circuit, wherein the storage circuit adopts a mixed storage design of an E2PROM and Flash, 4E 2 PROMs and 1 FLASH chip are connected to the MCU chip for storage, an E2PROM is connected to the chip for electric energy metering for data storage, and a data line of each E2PROM is connected with a pull-up clock line for more stable data transmission.

The intelligent control system further comprises a working state display circuit, wherein the working state display circuit is respectively provided with an operation indicator lamp, a communication indicator lamp, an alarm indicator lamp, an active signal indicator lamp and a reactive signal indicator lamp.

The temperature monitoring control circuit is provided with an incoming line and an outgoing line which are connected with a thermistor.

The utility model has the beneficial effects that:

according to the utility model, the uplink communication interacts with the cloud server in a Bluetooth mode, and the downlink communication interacts with the switch sub-equipment in an RS485 mode, so that the intelligent watch searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and other functions are realized; high reliability and convenient installation.

Drawings

Fig. 1 is a schematic circuit diagram of a power supply design scheme of a measurement switch based on bluetooth communication according to the present utility model.

Fig. 2 is a schematic circuit diagram of hardware connection of the measurement switch based on bluetooth communication according to the present utility model.

Fig. 3 is a schematic circuit diagram of an MCU circuit of the bluetooth communication based measurement switch according to the present utility model.

Fig. 4 is a schematic circuit diagram of an electric quantity metering circuit of a measuring switch based on bluetooth communication.

Fig. 5 is a schematic circuit diagram of a temperature sampling circuit of a measurement switch based on bluetooth communication according to the present utility model.

Fig. 6 is a schematic circuit diagram of an electric energy pulse circuit of the measurement switch based on bluetooth communication according to the present utility model.

Fig. 7 is a schematic circuit diagram of an RS485 communication circuit of the bluetooth communication based measurement switch according to the present utility model.

Fig. 8 is a schematic circuit diagram of an RS485 isolation circuit of the bluetooth communication based measurement switch according to the present utility model.

Fig. 9 is a schematic circuit diagram of a bluetooth module circuit of a measurement switch based on bluetooth communication according to the present utility model.

Fig. 10 is a schematic circuit diagram of an instant short-circuit protection circuit of a measurement switch based on bluetooth communication according to the present utility model.

Fig. 11 is a schematic circuit diagram of a voltage measurement sampling circuit of a measurement switch based on bluetooth communication according to the present utility model.

Fig. 12 is a schematic circuit diagram of a current metering sampling circuit of a measuring switch based on bluetooth communication according to the present utility model.

Detailed Description

The utility model will be further described with reference to the accompanying drawings

According to the utility model, as shown in fig. 1-12, the measuring switch based on bluetooth communication comprises a bluetooth communication channel, a two-way 485 communication channel, an electric energy metering, a short-circuit instantaneous protection, an MCU data processing circuit, a temperature monitoring control circuit and an RTC time real-time clock circuit, wherein the MCU data processing circuit is respectively connected with the bluetooth communication channel, the two-way 485 communication channel, the electric energy metering, the short-circuit instantaneous protection, the temperature monitoring control circuit and the RTC time real-time clock circuit.

Further detailed description: the power supply supplies power for external 220V, and the power is firstly passed through the AC inlet surge protection circuit and the EMI filter circuit and then is converted into two-way 12V power supply through the AC-DC power supply module. One path of 12V power supply is used for supplying power to the MCU, FLASH, E PROM and Bluetooth module; one path of 12V power supply is converted into 5V power supply through DC-DC to supply power to two paths of RS485 chips. Electric isolation treatment is carried out between the two weak current power supplies and 220V strong current, and 2500VAC isolation is carried out between the input and the double output; 2000VAC isolation between dual outputs 12V. The AC inlet surge protection circuit is characterized in that A, B and C three-phase power is respectively connected with the piezoresistors RV1 RV2 RV3. And then the power resistor R3R 5R 8 is connected. After passing through the two devices, the surge incoming quantity can be consumed, so that the surge protection effect is achieved. Then, the rectifying circuit is started, and in the design, the rectifying device adopts a rectifying diode D1D 2D 3D 4D 5D 6D 7D 8 with higher withstand voltage value. After rectification, the voltage and the current are filtered by an EMI filter circuit, so that more stable voltage and current are supplied to the rear end. And then the power supply enters a switching power supply module to be reduced to one path of DC12V and one path of DC5V. Wherein 12V is the power supply to the whole system circuit, and comprises an MCU circuit metering chip circuit memory circuit, a temperature sampling circuit, a system reset circuit and the like. The other path of DC5V circuit is used for independently supplying power to the two-path 485 circuit and has an isolation effect of 2000V with the DC12V circuit. The 12V-to-3.3V circuit is characterized in that one path of 12V is firstly converted into 5.6V through a DC-DC chip U3, and then is converted into 3.3V through an LDO chip U2. The DC-DC chip U3 is an adjustable DC-DC, and the output voltage value can be adjusted through the feedback resistor R11R 14. There are two ceramic capacitors to ground at the power input of U3. Respectively C15C 16, with values of 10uf and 0.1uf, which can play the roles of filtering and decoupling, that is, when the power source fluctuates, the two capacitors can play the role of enabling the power source to supply power smoothly. At the voltage output of U3, there are also two ceramic capacitors C12C 13 to ground, which are also 10uf and 0.1uf, respectively. They can act as filtering and decoupling to ensure that the output voltage is a smooth 5.6V output. After being converted into 5.6V output, the output is converted into 3.3V through a chip U2. The power input port and the power output port of the chip U3 are respectively provided with two ceramic capacitors for filtering and decoupling the power supply, so that stable input and output of the power supply are ensured.

Further detailed description: when the MCU is powered on, the address information of the intelligent circuit breaker is acquired through the downlink 485 channel, and the address number of the downlink equipment is judged according to the acquired address. And managing the mounted files according to the intelligent search table, managing the file addition of the newly added equipment, the file removal of the invalid equipment, the data difference inquiry among different equipment and the like. The files are stored in FLASH. The MCU is internally provided with a clock chip, and takes the clock chip as a counting clock of the RTC through an external low-speed oscillator (32.768 kHz crystal oscillator), and mainly acquires clock timing from a master station after power-on, so that the normal power-on operation of the RTC is kept; meanwhile, after file management is confirmed, bluetooth accurately collects electricity consumption data such as voltage, current, active power, line temperature, leakage current, electric energy and the like of the intelligent switch equipment in real time, waits for inquiring or actively reporting the data, and is beneficial to electric quantity statistics, power grid quality analysis, electricity consumption safety and the like. And the gateway can exchange data with the local protocol in the remote protocol with different communication protocols and data formats so as to achieve the operations of network interconnection, data inquiry, parameter setting, instruction control and the like.

The chip has rich interfaces, wherein, the burning interface of the chip is used for program upgrading of the chip. The AD conversion interface of the chip is used for analog signal sampling processing. The power-down detection pin of the chip is used for power-down detection. The reset pin of the chip is used for power-on reset and abnormal condition reset processing. The VBAT pin of this chip is used for real-time RTC recording. An I2C interface is used for connecting E2P devices for storage purposes. The SPI interface of the device is used for connecting a Flash device and storing large-capacity data. Two pairs of UART serial ports are used and connected to the metering chip for communication with the metering chip. A pair of UART interfaces are connected to the RS485 module circuit and are used for communicating with RS 485. The HOSCI interface is used for being connected with a crystal oscillator of a clock circuit so as to provide an oscillating clock for the MCU. While other I/O ports are also used as processing of some control signals.

Further detailed description: thus, the signal can be electrically isolated, and the performance interference is avoided. The withstand voltage of the isolation optocoupler reaches 5000kVRMS. The communication is carried out by adopting BL3085 chip. The RS485 chip is driven by a 5V power supply. And a Fail-Safe function (Fail-Safe) is built in the chip, so that the output end of the receiver is in a logic high level state when the input end of the receiver is in an open circuit or a short circuit. The chip uses a slew-rate limited driver to significantly reduce EMI and reflections due to improper termination match cables and to achieve error-free data transmission up to 500 kbps. The input impedance of the transceiver is 1/8 unit load, and 256 transceivers can be hung on the bus at maximum, so that half-duplex communication is realized. The I/O port pin has + -15 kV IEC 61000-4-2 contact discharge protection function. The A/B interface of the RS485 chip is externally hung with a bidirectional TVS protection device TVS1, the two-way TVS of the three-port D1 is integrated through the connection of the A/B interface end to the DGND, and the output end of the A/B interface is connected with PPTC resistors F1 and F2 in series.

Further detailed description: the emission power of the Bluetooth is 0dbm, the working current is uA-level product, and in order to ensure that the Bluetooth module emits the maximum power, the power supply voltage of the Bluetooth module is at least required to be ensured to work at 3.3V. Meanwhile, at the VCC_BT end of the Bluetooth module power supply interface, two ceramic capacitors C60 and C61 are arranged, so that partial power supply capacity of the ceramic capacitors is ensured to be shared under the condition of insufficient instantaneous power supply. Meanwhile, the work of the Bluetooth module is ensured to be low in interference. The Bluetooth module and the MCU are in URAT communication, the MCU sends data to the RX pin of the Bluetooth module through the TX pin of the MUC, so that the capacity of the MCU for controlling the Bluetooth module is achieved, and after the Bluetooth module receives the data, the Bluetooth module sends the data to the RX pin of the MCU module through the TX pin of the Bluetooth module, so that the data of the Bluetooth module is transmitted to the MCU for processing. The Bluetooth module is also provided with software reset control, and the reset control is carried out by connecting the IO port of the MCU with the RST pin of the Bluetooth module, so that when the Bluetooth is required to be reset, an instruction is sent by the MCU.

Further detailed description: the electric energy metering circuit is characterized in that three-phase electricity passes through three transformers respectively, the transformers are connected to the sockets of the circuit board respectively, currents induced by the transformers are converted into differential voltages through resistors R168, R158, R169, R159, R170 and R160 respectively and enter a metering chip, the metering chip calculates data, then the data are transmitted to the MCU through a serial port for unified processing, after the MCU processes the data, the data are transmitted to the Bluetooth through the serial port of the MCU, the Bluetooth transmits the data to a remote client through a wireless transmission protocol, and the client looks over the electric quantity.

The electric energy meter comprises an MCU chip, a storage circuit, an electric energy meter and a storage circuit, wherein the storage circuit adopts a mixed storage design of an E2PROM and Flash, 4E 2PROM and 1 FLASH chips are connected to the MCU chip for storage, and the electric energy meter chip is connected with an E2PROM for data storage. The data line and the clock line of each E2PROM are connected with a pull-up, so that data is transmitted more stably.

Further detailed description: the running indicator lamp, the communication indicator lamp, the alarm indicator lamp, the active signal indicator lamp and the reactive signal indicator lamp are respectively an LED3, an LED4, an LED5, an LED6 and an LED7, the anode is connected with 3.3V, the cathode is respectively connected with a 1K resistor in series and then connected with a corresponding MCU, and therefore flickering of the LED is achieved.

Further detailed description: the measurement switch can perform trip protection no matter when the temperatures of the incoming line and the outgoing line are at the threshold value set by us.

At the inlet and outlet ends, a thermistor is used for sensing the temperature change, so that the resistance change is achieved. The thermistor adopts a fixed resistor connected in series to divide voltage, so that the MCU obtains the level change, and the temperature is sampled and judged.

Further detailed description: the system comprises a metering chip, a working voltage sampling circuit, a Bluetooth module and a control circuit, wherein the working voltage sampling circuit is used for dividing voltages through three groups of resistors respectively, then inputting the voltage of the last resistor to the metering chip for metering by about 180MV, and then displaying the voltage through a display screen, and sending data to the Bluetooth module through a serial port, and the Bluetooth module is uploaded to a remote place again, so that customers can check conveniently. The resistances used for the a-phase voltages are 6 200K resistances, one 20K resistance, which are R161, R162, R163, R164, R165, R166, R167, respectively. The resistances used for the B phase voltages are 6 200K resistances, one 20K resistance, which are R174, R175, R176, R177, R178, R179, respectively. The resistances used for the C phase voltages are 6 200K resistances, one 20K resistance, which are R181, R182, R183, R184, R185, R186, R187, respectively.

Further detailed description: when a user accesses the three-phase line of the measuring switch to be in instantaneous short circuit, the measuring switch can acquire a value when a large current flows, so that the opening is controlled, the accessed commercial power is disconnected, and the function of protecting the rear end is achieved. The three phase lines are respectively connected with three bridge stacks to rectify the induced current induced by the three phase lines through three protection transformers, and then the rectified induced current is converted into voltage through a resistor of 1 ohm, and the voltage converted by the set of circuits is negative voltage, so that the three negative voltages are respectively converted into equivalent positive voltages by the three operational amplifiers U29, U30 and U31 in the back-end circuit, and finally the positive voltages are input to an AD pin in the MCU, and the AD conversion is performed first to convert analog signals into digital signals, so that the MCU is used for judging. Finally, when the number acquired by the MCU is larger than a preset threshold value, the MCU judges that the three phase lines have instant short circuit, and the MCU immediately sends an instruction to enable the equipment to be opened, so that the function of power-off protection is achieved.

The utility model and its embodiments have been described in terms of components which are standard components or which are known to those skilled in the art, whose construction and principle are known to those skilled in the art from technical manuals or by routine experimentation, and are not limited to the embodiments shown in the drawings, but are only one of them, without limiting the actual construction. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims

1. Measurement switch based on bluetooth communication, its characterized in that: the intelligent control system comprises a Bluetooth communication channel, a two-way 485 communication channel, electric energy metering, short-circuit instantaneous protection, an MCU data processing circuit, a temperature monitoring control circuit and an RTC real-time clock circuit, wherein the MCU data processing circuit is respectively connected with the Bluetooth communication channel, the two-way 485 communication channel, the electric energy metering, the short-circuit instantaneous protection, the temperature monitoring control circuit and the RTC real-time clock circuit.

2. The bluetooth communication based measurement switch of claim 1, wherein: the system also comprises an AC inlet surge protection circuit and an AC-DC power supply module, wherein the AC is converted into a double-path DC12V, and one path of the AC is converted into a 3.3V DC-DC circuit.

3. The bluetooth communication based measurement switch of claim 1, wherein: the MCU data processing circuit uses U5 as a main chip to process, the chip adopts 3.3V power supply, and a clock circuit, a reset circuit, a power failure detection circuit and a power supply filter circuit are arranged on the periphery of the chip.

4. The bluetooth communication based measurement switch of claim 1, wherein: the two-way 485 communication channel is isolated by adopting an optocoupler, and UART communication between the 485 channel and the MCU is isolated by the optocoupler chip.

5. The bluetooth communication based measurement switch of claim 1, wherein: the Bluetooth communication channel is a low-power consumption module, and the power supply is 3.3V-4.2V.

6. The bluetooth communication based measurement switch of claim 1, wherein: the electric energy meter comprises an MCU chip, and is characterized by further comprising a storage circuit, wherein the storage circuit adopts a mixed storage design of an E2PROM and Flash, 4E 2 PROMs and 1 FLASH chip are connected to the MCU chip for storage, an E2PROM is connected to the chip for electric energy metering for data storage, and a data line of each E2PROM is connected with a pull-up clock line for more stable data transmission.

7. The bluetooth communication based measurement switch of claim 1, wherein: the intelligent control system further comprises a working state display circuit, wherein the working state display circuit is respectively provided with an operation indicator lamp, a communication indicator lamp, an alarm indicator lamp, an active signal indicator lamp and a reactive signal indicator lamp.

8. The bluetooth communication based measurement switch of claim 1, wherein: the temperature monitoring control circuit is provided with an incoming line and an outgoing line which are connected with a thermistor.