Multifunctional electric power meter

Abstract

The utility model discloses a multifunctional electric power meter, which comprises a shell and a circuit system, the circuit system comprises a controller, a sampling module, a liquid crystal display module, a storage module, a key module, an input module, an output module and a wireless communication module, a wireless network module adopts a BC26 network module, and the BC26 network module is connected with an SIM (Subscriber Identity Module) card module. According to the utility model, the wireless network technology is adopted to realize wireless remote communication, state information such as circuit breaker position signals and knife switch position signals of the electrical instrument is detected through a photoelectric coupler of the output and output module, and whether related electrical parameters are out of limit or not is monitored in cooperation with the use of constant value system alarm of the instrument. The wireless and intelligent electrical instrument is realized; by adopting the NB-IoT technology, the system has the characteristics of wide coverage, low power consumption, low cost, massive connection and high security.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a multifunctional electric power meter. Background Art

[0002] The multifunctional power meter is a self-developed multifunctional intelligent meter with programmable measurement, display, digital communication and electric energy pulse transmission output. It can complete power measurement, electric energy metering, data display, collection and transmission. The multifunctional power meter is widely used in substation automation, distribution automation, intelligent buildings, and internal enterprise electric energy measurement, management, and assessment to realize LED on-site display and remote digital interface communication.

[0003] Chinese patent 202020823609.X discloses a multifunctional power meter. The background technology of the patent mentions that the power meter adopts a remote RS-485 digital interface and uses a communication protocol to achieve communication. However, wired communication will cause complex lines. With the advancement of technology, wireless and intelligent technology have become the development direction of power meters. Utility Model Content

[0004] The purpose of the utility model is to provide a multifunctional electric power meter to solve the technical problems in the above-mentioned background technology, aiming to realize wireless communication and remote control of the electric power meter.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multifunctional electric power meter, comprising a shell and a circuit system, the circuit board of the circuit system is installed in the shell, the circuit system comprises a controller, a sampling module, a liquid crystal display module, a storage module, a key module, an input module, an output module and a wireless network module, the sampling module, the liquid crystal display module, the storage module, the key module, the input and output module and the wireless network module are all electrically connected to the controller, the liquid crystal screen of the liquid crystal display module is fixedly connected to the shell, the wireless network module adopts a BC26 network module, the BC26 network module is connected to a SIM card module, the SIM_GND, SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD pins of the BC26 network module are respectively connected to the corresponding pins of the SIM card module, and each pin in the SIM card circuit connected to the BC26 network module is connected to the cathode of the TVS diode, the anode of the TVS diode is grounded, and the internal power supply of the BC26 network module directly supplies power to the SIM card through the SIM_VDD interface.

[0006] Furthermore, the above-mentioned multifunctional electric power meter, wherein: two buckles are further provided, the buckles are provided with a snap-fitting portion, the left and right side walls of the shell are provided with snap-fitting grooves, the snap-fitting grooves cooperate with the snap-fitting portion, so that the left and right side walls of the shell are respectively connected to the two buckles in a detachable manner.

[0007] Furthermore, in the above-mentioned multifunctional electric power meter, the controller adopts an STM32F030C8 single-chip microcomputer, the sampling module includes a metering chip, a resistor voltage divider circuit and a current transformer current reduction circuit, the resistor voltage divider circuit and the current transformer current reduction circuit are both electrically connected to the metering chip, the metering chip is electrically connected to the controller, and the metering chip adopts a V9203 chip.

[0008] Furthermore, in the above-mentioned multifunctional electric power meter, the storage module is used for storing electric power and key data during power failure, and the storage module adopts the storage chip MB85RC16.

[0009] Furthermore, the above-mentioned multifunctional electric power meter, wherein: the input and output module includes two dry contact input units and two passive normally open electromagnetic relay output units, the input unit adopts a passive switch without polarity, which is used to detect the circuit breaker and judge the position status of the knife switch; the output unit mainly realizes the alarm or tripping function by monitoring the switch status of the relay.

[0010] Furthermore, the above-mentioned multifunctional electric power meter, wherein: the input unit adopts a photocoupler PC817C, the switch signal is connected to the second pin of the photocoupler, the first pin of the photocoupler is connected to the 12V power supply through a pull-up resistor, the third pin of the photocoupler is grounded, the fourth pin of the photocoupler is connected to the power supply VCC through a pull-up resistor, and the first pin of the photocoupler is connected to the cathode of the freewheeling diode 1N4148, and the second pin of the photocoupler is connected to the anode of the freewheeling diode 1N4148.

[0011] Furthermore, the above-mentioned multifunctional electric power meter, wherein: the output unit includes a photocoupler PC817C, a transistor 9013 and a relay JZC-32F, the input end of the photocoupler PC817C is connected to the pin of the single-chip microcomputer, and the output end of the photocoupler is connected to the control end of the transistor 9013, the relay JZC-32F is connected to the output end of the transistor 9013, the single-chip microcomputer controls the on and off of the voltage at the output end of the photocoupler by outputting high and low levels, thereby driving the transistor 9013 to turn on, thereby controlling the opening and closing state of the relay JZC-32F, and a freewheeling diode 1N4148 is connected in parallel to the coil end of the electromagnetic relay JZC-32F.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model adopts wireless network technology to realize wireless remote communication, and detects the status information such as the circuit breaker position signal and the knife switch position signal of the electrical instrument through the photoelectric coupler of the output module, and cooperates with the use of the instrument's fixed value system alarm to monitor whether the relevant electrical parameters are out of limit, thereby realizing the wireless and intelligentization of the electrical instrument; (2) The utility model adopts NB-IoT Internet of Things technology, which has the characteristics of wide coverage, low power consumption, low cost, massive connection and high security; (3) The power-off storage of power data is realized through the storage module; (4) In the input unit, the input and output signals are isolated by a photoelectric isolator, and a passive relay is used in the output unit to improve the electromagnetic compatibility of the power meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is the circuit system frame of the utility model;

[0016] Figure 3 This is the controller peripheral circuit diagram;

[0017] Figure 4 It is the circuit schematic diagram of the storage module;

[0018] Figure 5 is the schematic diagram of the input unit;

[0019] Figure 6 It is the schematic diagram of the output unit;

[0020] Figure 7 This is the pin diagram of the BC26 network module;

[0021] Figure 8 This is the circuit diagram of the SIM card slot interface.

[0022] In the figure: 1. housing; 11. snap-fitting part; 2. LCD screen; 3. buckle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-8The utility model provides a multifunctional electric power meter, including a housing 1, a circuit system and two buckles 3. The housing 1 is provided with a card slot on the left and right side walls. The buckle 3 is placed in the wall. The buckle 3 is provided with a snap-fitting part. The card slot cooperates with the snap-fitting part, so that the left and right side walls of the housing 1 are respectively connected to the two buckles 3 in a detachable manner. Figure 2 As shown, the circuit system includes a controller, a sampling module, a liquid crystal display module, a storage module, a key module, an input-output module and a wireless network module. The sampling module, the liquid crystal display module, the storage module, the key module, the input-output module and the wireless network module are all electrically connected to the controller, and the liquid crystal screen 2 of the liquid crystal display module is fixedly connected to the housing 1.

[0025] Preferably, a temperature and humidity acquisition module is also provided, which is used to monitor the temperature and humidity of the environment in which the power meter is located, and can alarm when the temperature is too high to prevent electrical fires. The temperature and humidity acquisition module is connected to the controller, and the temperature and humidity acquisition module uses the temperature and humidity sensor AM2320.

[0026] Specifically, the controller uses a STM32F030C8 single-chip microcomputer, and the peripheral circuit of the single-chip microcomputer is as follows: Figure 3 As shown. The sampling module includes a metering chip, a resistor voltage divider circuit and a current transformer current reduction circuit. The resistor voltage divider circuit and the current transformer current reduction circuit are electrically connected to the metering chip, and the metering chip is electrically connected to the controller. The metering chip uses a V9203 chip. The resistor voltage divider circuit is used to collect voltage signals, and the current transformer current reduction circuit is used to collect current signals. The resistor voltage divider circuit and the current transformer current reduction circuit belong to the prior art and will not be described in detail here. The storage module is used for power-off storage of electricity and key data. The storage module uses a storage chip MB85RC16. The storage chip MB85RC16 and the peripheral circuits are as follows. Figure 4 As shown, the memory chip MB85RC16 has the characteristics of fast writing speed and long reading and writing life. It can still store data after power failure, which is very suitable for storing data in power meters.

[0027] The input and output module of the power meter includes two dry contact input units and two passive normally open electromagnetic relay output units, which are used to realize power distribution automation and power monitoring. The input unit uses a passive switch without polarity to detect the circuit breaker and judge the position status of the knife switch. The output unit mainly realizes the alarm or tripping function by monitoring the switch status of the relay. Due to the large amount of external switch signal noise, the input unit uses a photocoupler PC817C to isolate the external signal source, the switch signal is connected to the pin 2 of the photocoupler, the pin 1 of the photocoupler is connected to the 12V power supply through a pull-up resistor, the pin 3 of the photocoupler is grounded, the pin 4 of the photocoupler is connected to the power supply VCC through a pull-up resistor, and the pin 1 of the photocoupler is connected to the cathode of the freewheeling diode 1N4148, and the pin 2 of the photocoupler is connected to the anode of the freewheeling diode 1N4148.

[0028] The output unit includes a photocoupler PC817C, a transistor 9013 and a relay JZC-32F. The input end of the photocoupler PC817C is connected to the pin of the microcontroller, and the output end of the photocoupler is connected to the control end of the transistor 9013. The relay JZC-32F is connected to the output end of the transistor 9013. The microcontroller controls the on and off of the voltage at the output end of the photocoupler by outputting high and low levels, thereby driving the transistor 9013 to turn on, thereby controlling the opening and closing state of the relay JZC-32F. The freewheeling diode 1N4148 is connected in parallel with the coil end of the electromagnetic relay to prevent a large reverse electric current from breaking down the transistor after the coil is powered off, thereby playing a role in circuit protection. The schematic diagram of the output unit circuit is shown in the figure below. Figure 6 shown.

[0029] The wireless network module uses NB-IoT, which is narrowband Internet of Things technology. NB-IoT is an emerging Internet of Things communication technology that aims to provide network connections for massive connected devices in the Internet of Things. It has the characteristics of wide coverage, low power consumption, low cost, massive connections and high security. The wireless network module uses the BC26 network module. The peripheral circuit of the BC26 network module is as follows Figure 7 and Figure 8 As shown in the figure, the BC26 network module is connected to the SIM card module, where RF_ANT is the antenna connection pin. The RXD pin is connected to the USART1_TX pin of the microcontroller, and the TXD pin is connected to the USART1_RX pin of the microcontroller. The microcontroller sends instructions to the BC26 network module to view its working mode, signal strength and other information. The SIM_GND, SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD of the BC26 network module are connected to the corresponding pins of the SIM card module respectively. Figure 8The figure shows the circuit design of the SIM card slot, and each pin in the SIM card circuit connected to the BC26 network module is connected to the cathode of the TVS diode, and the anode of the TVS diode is grounded. The TVS diode can prevent the static electricity generated when the card is inserted and removed from the module from damaging the module. The internal power supply of the BC26 network module directly supplies power to the SIM card through the SIM_VDD interface.

[0030] The utility model can realize the collection of voltage and current through the collection module and display the data through the display module, realize the power-off storage of power data through the storage module, adopt wireless network technology to realize wireless remote control, and detect the circuit breaker position signal, knife switch position signal and other status information of the electrical instrument through the photoelectric coupler of the output module, and cooperate with the use of the instrument's fixed value system alarm to monitor whether the relevant electrical parameters are out of limit. In addition, the utility model adopts NB-IoT Internet of Things technology, which has the characteristics of wide coverage, low power consumption, low cost, massive connection and high security. In the input unit, the input and output signals are isolated by a photoelectric isolator, and a passive relay is used in the output unit to improve the electromagnetic compatibility of the power meter.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multifunctional electric power meter, characterized in that: It comprises a shell and a circuit system, wherein a circuit board of the circuit system is installed in the shell, wherein the circuit system comprises a controller, a sampling module, a liquid crystal display module, a storage module, a key module, an input module, an output module and a wireless network module, wherein the sampling module, the liquid crystal display module, the storage module, the key module, the input / output module and the wireless network module are all electrically connected to the controller, wherein a liquid crystal screen of the liquid crystal display module is fixedly connected to the shell, wherein the wireless network module adopts a BC26 network module, wherein the BC26 network module is connected to a SIM card module, wherein SIM_GND, SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD pins of the BC26 network module are respectively connected to corresponding pins of the SIM card module, and each pin in the SIM card circuit connected to the BC26 network module is connected to the cathode of a TVS diode, wherein the anode of the TVS diode is grounded, and an internal power supply of the BC26 network module directly supplies power to the SIM card through a SIM_VDD interface.

2. The multifunctional electric power meter according to claim 1, characterized in that: Two buckles are further provided, and a clamping part is provided on the buckles. The left and right side walls of the shell are provided with clamping grooves, and the clamping grooves cooperate with the clamping part, so that the left and right side walls of the shell are respectively connected to the two buckles in a detachable manner.

3. The multifunctional electric power meter according to claim 1, characterized in that: The controller adopts an STM32F030C8 single-chip microcomputer, and the sampling module includes a metering chip, a resistor voltage divider circuit, and a current transformer current reduction circuit. The resistor voltage divider circuit and the current transformer current reduction circuit are both electrically connected to the metering chip, and the metering chip is electrically connected to the controller. The metering chip adopts a V9203 chip.

4. The multifunctional electric power meter according to claim 1, characterized in that: The storage module is used for power-off storage of electricity and key data, and the storage module adopts the storage chip MB85RC16.

5. The multifunctional electric power meter according to claim 1, characterized in that: The input-output module includes two dry contact input units and two passive normally open electromagnetic relay output units. The input unit adopts a passive switch without polarity to detect the circuit breaker and judge the position status of the knife switch; the output unit mainly realizes the alarm or tripping function by monitoring the switch status of the relay.

6. The multifunctional electric power meter according to claim 5, characterized in that: The input unit adopts a photocoupler PC817C, the switch signal is connected to the second pin of the photocoupler, the first pin of the photocoupler is connected to the 12V power supply through a pull-up resistor, the third pin of the photocoupler is grounded, the fourth pin of the photocoupler is connected to the power supply VCC through a pull-up resistor, and the first pin of the photocoupler is connected to the cathode of the freewheeling diode 1N4148, and the second pin of the photocoupler is connected to the anode of the freewheeling diode 1N4148.

7. The multifunctional electric power meter according to claim 5, characterized in that: The output unit includes a photoelectric coupler PC817C, a transistor 9013 and a relay JZC-32F. The input end of the photoelectric coupler PC817C is connected to the pin of the single-chip microcomputer, and the output end of the photoelectric coupler is connected to the control end of the transistor 9013. The relay JZC-32F is connected to the output end of the transistor 9013. The single-chip microcomputer controls the on and off of the voltage at the output end of the photoelectric coupler by outputting high and low levels, thereby driving the transistor 9013 to turn on, thereby controlling the opening and closing state of the relay JZC-32F. A freewheeling diode 1N4148 is connected in parallel to the coil end of the electromagnetic relay JZC-32F.

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