CN220730317U - Electric energy metering circuit and electric energy meter - Google Patents
Electric energy metering circuit and electric energy meter Download PDFInfo
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- CN220730317U CN220730317U CN202322422821.1U CN202322422821U CN220730317U CN 220730317 U CN220730317 U CN 220730317U CN 202322422821 U CN202322422821 U CN 202322422821U CN 220730317 U CN220730317 U CN 220730317U
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Abstract
The application discloses an electric energy metering circuit and an electric energy meter, wherein the circuit comprises a first input connecting wire and a second input connecting wire; the second input connecting wire is a second phase live wire when the first input connecting wire is a first phase live wire, and the second input connecting wire is a zero wire when the first input connecting wire is a live wire; the two input ends of the electric energy metering module are connected with the second input connecting line and are used for converting electric energy metering of current on the second input connecting line into electricity consumption information; the cellular communication module is connected with the electric energy metering module and is used for uploading the electricity utilization information to a cloud platform; and the two input ends of the power supply module are respectively connected with the first input connecting wire and the second input connecting wire and are used for acquiring electric energy from the first input connecting wire and supplying power for the cellular communication module. The utility model provides a brand new, safe and reliable electricity meter reading scheme.
Description
Technical Field
The application relates to the technical field of electronic electric meters, in particular to an electric energy metering circuit and an electric energy meter.
Background
The electric energy meter is an instrument for measuring electric energy, currently mainstream products in the electric energy meter industry are in a rapid development stage internationally, and the electric energy meter is updated in the world including developed economy and developing countries so as to adapt to the current change of the situation of the whole world. Firstly, the global energy conservation and emission reduction requirements are met, accurate energy metering is needed, each electricity consumption main body is promoted to conduct electricity consumption control according to energy change, and electricity consumption habits are changed; secondly, the intelligent electric energy meter is used as a node of a power grid to meet the requirements of modernization and informatization of power enterprise management, so that the real-time electricity consumption condition of metering measurement points such as power users, substations and the like can be rapidly and effectively known, and more accurate service and management are provided.
How to enable an electric energy meter to upload electric quantity use information to a value cloud platform is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides an electric energy metering circuit and an electric energy meter, and provides a brand new, safe and reliable electricity meter reading scheme.
In a first aspect, embodiments of the present application provide an electric energy metering circuit, including:
a live wire and a neutral wire;
the two input ends of the electric energy metering module are connected with the zero line and are used for converting electric energy metering of current on the zero line into electricity consumption;
the cellular communication module is connected with the electric energy metering module and is used for uploading the electricity utilization information to a cloud platform;
and the two input ends of the power supply module are respectively connected with the live wire and the zero wire and are used for acquiring electric energy from an input connecting wire and supplying power for the cellular communication module.
In some embodiments, the cellular communication module is a 4G communication module.
In some embodiments, the 4G communication module comprises: a 4G communication chip and a first SIM card holder;
the antenna pin of the 4G communication chip is connected with an antenna;
the SIM data pin of the 4G communication chip is connected with the IO receiving and transmitting pin of the first SIM card holder;
the SIM clock pin of the 4G communication chip is connected with the clock signal output pin of the first SIM card holder;
the SIM reset control pin of the 4G communication chip is connected with the reset control pin of the first SIM card holder;
the SIM power control pin of the 4G communication chip is connected with the power input pin of the first SIM card holder, and the grounding pin of the first SIM card holder is grounded.
In some embodiments, the 4G communication module further comprises an electrostatic protection tube;
the first pin of the electrostatic protection tube is connected with the IO receiving and transmitting pin of the first SIM card holder;
the third pin of the electrostatic protection tube is connected with the clock signal output pin of the first SIM card holder;
the fourth pin of the electrostatic protection tube is connected with the reset control pin of the first SIM card holder;
the second pin of the electrostatic protection tube is grounded, and the fifth pin of the electrostatic protection tube is connected to the first working voltage output by the power supply module.
In some embodiments, the power metering module comprises a power metering chip, and the 4G communication module further comprises a first connector;
the data receiving pin of the 4G communication chip is connected with the third pin of the first connector, and the third pin of the first connector is connected with the data transmitting pin of the electric energy metering chip;
the data transmitting pin of the 4G communication chip is connected with the eighth pin of the first connector, and the eighth pin of the first connector is connected with the data receiving pin of the electric energy metering chip.
In some embodiments, the 4G communication module further comprises a switching unit and a control unit, the switching unit comprising a first triode, a second triode, the control unit comprising a first zero ohm resistance, a second zero ohm resistance, and a third zero ohm resistance;
the reset control pin of the 4G communication chip is connected with one end of the third zero ohm resistor, and the other end of the third zero ohm resistor is connected with the fourth pin of the first connector;
the on-off control pin of the 4G communication chip is respectively connected with one end of the first zero ohm resistor and one end of the second zero ohm resistor, the other end of the first zero ohm resistor is connected with the seventh pin of the first connector, and the other end of the second zero ohm resistor is grounded;
the state control pin of the 4G communication chip is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the fifth pin of the first connector;
the pilot lamp control pin of the 4G communication chip is connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the sixth pin of the first connector;
the first pin and the tenth pin of the first connector are respectively connected to the first working voltage, and the second pin and the ninth pin of the first connector are respectively grounded.
In some embodiments, the power metering circuit further comprises a USB interface module comprising a USB connector;
the USB data positive electrode pin of the 4G communication chip is connected with the second positive electrode of the USB connector, and the second positive electrode of the USB connector is in short circuit with the first positive electrode of the USB connector;
the USB data negative electrode pin of the 4G communication chip is connected with the second negative electrode of the USB connector, and the second negative electrode of the USB connector is in short circuit with the first negative electrode of the USB connector;
the USB power supply access pin USB of the 4G communication chip is connected with the first power supply input pin of the USB connector to access the second working voltage provided by the power supply module, and the first power supply input pin of the USB connector is in short circuit with the second power supply input pin of the USB connector.
In some embodiments, the power supply module includes a first voltage conversion unit and a second voltage conversion unit;
the first voltage conversion unit is respectively connected with the live wire and the zero wire and is used for converting alternating-current commercial power into direct-current first working voltage;
the second voltage conversion unit is connected with the first voltage conversion unit, and is used for converting the first working voltage into the second working voltage and the third working voltage and outputting a reset signal.
In some embodiments, the power metering circuit further comprises a timing module; the timing module comprises a timer and a third triode;
the reset control pin of the timer is connected with the reset signal;
the timing control pin of the 4G communication chip is connected with the emitter of the third triode;
and the base electrode of the third triode is connected with a third working voltage, and the collector electrode of the third triode is connected with the third working voltage and is connected with the control pin of the timer.
In a second aspect, an embodiment of the present application further provides an electric energy meter, where the electric energy meter includes a housing and the electric energy metering circuit of the first aspect, and the electric energy metering circuit is disposed in the housing.
The embodiment of the application provides an electric energy metering circuit and an electric energy meter, which solve the problems of unstable wireless communication, poor signals and the like by utilizing the reliable communication capacity and network coverage capacity of a 4G cellular network, and provide a brand-new, safe and reliable electricity meter reading scheme for customers.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power metering circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another embodiment of an electric energy metering circuit;
fig. 3 to 11 are schematic circuit diagrams of an electric energy metering circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "one end," "the other end," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present application and to simplify the description, rather than to indicate or imply that the apparatus or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "" "is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the term "connected" shall be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, can be connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The application provides an electric energy metering circuit and an electric energy meter. The electric energy meter in the embodiment of the application can be used for household electricity metering, factory electricity metering, hospital electricity metering and the like.
Referring to fig. 1 and fig. 2, a schematic structural diagram of an electric energy metering circuit according to an embodiment of the present application is shown in fig. 1 and fig. 2, and the electric energy metering circuit includes:
a first input connection line T1 and a second input connection line T2; the first input connection line T1 is a first phase line L A The second input connection line T2 is a second phase live line L B When the first input connecting line T1 is a live line L, the second input connecting line T2 is a zero line N;
the electric energy metering module 40 is connected with the second input connecting line T2 at two input ends of the electric energy metering module 40, and is used for converting electric energy metering of current on the second input connecting line T2 into electricity consumption information;
the cellular communication module 20 is connected with the electric energy metering module 40 and is used for uploading the electricity utilization information to a cloud platform;
the power supply module 30, two input ends of the power supply module 30 are respectively connected with the first input connecting wire T1 and the second input connecting wire T2, and are used for obtaining electric energy from the first input connecting wire T1 and supplying power to the cellular communication module 20.
Specifically, the electric wires include a live wire L, a neutral wire N, and a ground wire PE. As shown in fig. 1, if the first input connection line T1 is the live line L and the second input connection line T2 is the neutral line N, at this time, two input ends of the electric energy metering module 40 may be connected to the neutral line N, and two input ends of the power supply module 30 may be connected to the neutral line N and the live line L, respectively. As shown in fig. 2, if the first input connection line T1 is the first phase line L A The second input connection line T2 is a second phase live line L B At this time, two input ends of the electric energy metering module 40 can be respectively connected with the second phase live wire L B Two input ends of the power supply module 30 can be connected with the first phase line L respectively A And a second phase firing line L B And (5) connection. The output of the power metering module 40 is connected to the input of the cellular communication module 20, and the two inputs of the power supply module 30 are essentially power-taking terminals, which will take power from the first input connection T1 and transfer it to the power supply input of the cellular communication module 20 for powering the cellular communication module 20. The output of the cellular communication module 20 is connected to an antenna RF 1. In this way, the electric energy metering module 40 is responsible for obtaining the electric energy consumption information through the measurement of the voltage, the current and the power, the cellular communication module 20 is responsible for collecting the electric energy consumption information obtained by the electric energy metering module 40 and reporting the electric energy consumption information to the cloud platform through the antenna RF1, and of course, the cellular communication module 20 can also report the position information to the cloud platform at the same time. Among them, since the cellular communication module 20 supports mobile cellular communication, the location information of the power metering module 40 can be acquired using the base station topology network of the GSM (Global System for Mobile Communication, digital cellular mobile communication system) base station and the base station information.
In some embodiments, the cellular communication module 20 is a 4G communication module.
In some embodiments, as shown in fig. 3 and 4, the 4G communication module includes: a 4G communication chip U1 and a first SIM card holder CN1;
an antenna pin MAIN_ANT of the 4G communication chip U1 is connected with an antenna RF 1;
the SIM DATA pin USIM_DATA of the 4G communication chip U1 is connected with the IO transceiving pin C7 of the first SIM card holder CN1;
a SIM clock pin USIM_CLK of the 4G communication chip U1 is connected with a clock signal output pin C3 of the first SIM card holder CN1;
a SIM reset control pin USIM_RST of the 4G communication chip U1 is connected with a reset control pin C2 of the first SIM card holder CN1;
the SIM power control pin usim_vdd of the 4G communication chip U1 is connected to the power input pin C1 of the first SIM card holder CN1, and the ground pin C5 of the first SIM card holder CN1 is grounded GND.
Specifically, the SIM card holders may include two SIM card holders, i.e., a first SIM card holder CN1 and a second SIM card holder U4, where a USIM card supporting a 4G cellular network may be placed in the first SIM card holder CN1, and the second SIM card holder U4 may be used as an extension, so that a USIM card supporting a 3G cellular network or a 5G cellular network may be placed later according to the type of the cellular network. The first SIM card holder CN1 may be a nano1.4_c77877 type, and the 4G communication chip U1 may be a SIM7600CE-T-ZIYUN type.
The second pin 2 and the third pin 3 of the second SIM card holder U4 are connected and then connected with the SIM DATA pin usim_data of the 4G communication chip U1, the sixth pin 6 of the second SIM card holder U4 may be connected with the SIM clock pin usim_clk of the 4G communication chip U1, the seventh pin 7 of the second SIM card holder U4 may be connected with the SIM reset control pin usim_rst of the 4G communication chip U1, the eighth pin 8 of the second SIM card holder U4 may be connected with the SIM power control pin usim_vdd of the 4G communication chip U1, and the first pin 1 of the second SIM card holder U4 may be grounded GND.
In some embodiments, as shown in fig. 3 and 7, the 4G communication module further includes an electrostatic protection tube D1;
the first pin 1 of the electrostatic protection tube D1 is connected with the IO transceiver pin C7 of the first SIM card holder CN1;
the third pin 3 of the electrostatic protection tube D1 is connected with the clock signal output pin C3 of the first SIM card holder CN1;
the fourth pin 4 of the electrostatic protection tube D1 is connected with the reset control pin C2 of the first SIM card holder CN1;
the second pin 2 of the electrostatic protection tube D1 is grounded, and the fifth pin 5 of the electrostatic protection tube D1 is connected to the first working voltage vcc_5v output by the power supply module 30.
Specifically, because of the higher electromagnetic compatibility and anti-electromagnetic interference requirements for the performance of the electric energy meter, the electric energy meter can be physically isolated (provided with a certain distance) on the circuit board. In addition, the electrostatic protection tube D1 can be connected between the connection circuit of the first SIM card holder CN1 and the 4G communication chip U1, and the type of the electrostatic protection tube D1 can be ESDU5V0H4, so that high-frequency pulse can be prevented from being transmitted into the 4G communication chip U1, and the interference to the normal operation of the 4G communication chip U1 is avoided.
In some embodiments, as shown in fig. 4 and 8, the power metering module 40 includes a power metering chip (not shown), and the 4G communication module further includes a first connector H1;
the data receiving pin RXD of the 4G communication chip U1 is connected with the third pin 3 of the first connector H1, and the third pin 3 of the first connector H1 is connected with the data transmitting pin IM1253b_tx of the electric energy metering chip;
the data transmitting pin TXD of the 4G communication chip U1 is connected to the eighth pin 8 of the first connector H1, and the eighth pin 8 of the first connector H1 is connected to the data receiving pin IM1253b_rx of the electric energy metering chip.
Specifically, the first connector H1 may be F185-1210A0BSYA1, the electric energy metering chip may be IM1253B, and the IM1253B is a single-phase ac/dc electric energy metering module 40, and may collect single-phase ac/dc parameters, including multiple electrical parameters such as voltage, current, power factor, frequency, electric energy, and temperature, so as to implement automatic data collection and monitoring functions.
In some embodiments, as shown in fig. 4 and 9, the 4G communication module further includes a switching unit including a first transistor Q3, a second transistor Q4, and a control unit including a first zero ohm resistor R12, a second zero ohm resistor R5, and a third zero ohm resistor R13;
the RESET control pin RESET of the 4G communication chip U1 is connected with one end of the third zero ohm resistor R13, and the other end of the third zero ohm resistor R13 is connected with the fourth pin 4 of the first connector H1;
the on-off control pin PWRKEY of the 4G communication chip U1 is respectively connected with one end of the first zero ohm resistor R12 and one end of the second zero ohm resistor R5, the other end of the first zero ohm resistor R12 is connected with the seventh pin 7 of the first connector H1, and the other end of the second zero ohm resistor R5 is grounded;
the state control pin LED_STATUS of the 4G communication chip U1 is connected with the base electrode of the first triode Q3, the emitting electrode of the first triode Q3 is grounded, and the collecting electrode of the first triode Q3 is connected with the fifth pin 5 of the first connector H1;
the indicator lamp control pin LED_NET of the 4G communication chip U1 is connected with the base electrode of the second triode Q4, the emitter electrode of the second triode Q4 is grounded, and the collector electrode of the second triode Q4 is connected with the sixth pin 6 of the first connector H1;
the first pin 1 and the tenth pin 10 of the first connector H1 are respectively connected to the first working voltage vcc_5v, and the second pin 2 and the ninth pin 9 of the first connector H1 are respectively grounded.
Specifically, each module of the electric energy metering circuit is integrated on a PCB, and the whole PCB is arranged in a set of plastic ammeter shell. The wireless communication mode supporting the 4G cellular network can realize remote power utilization monitoring and management by caching the data of the power utilization information in the self-contained storage area in the 4G communication chip U1. When the 4G communication module is connected with the cloud platform and abnormally interrupted, the electricity consumption information can be automatically and temporarily cached, and when the connection of the 4G communication module and the cloud platform is switched from an abnormally interrupted state to a normal networking state, the stored electricity consumption information is reported to the cloud platform.
In addition, the 4G communication chip U1 is further provided with a state control pin LED_STATUS and an indicator lamp control pin LED_NET, so that the 4G communication chip U1 is connected with an LED chip (not shown in the figure) to directly drive and display the electric energy meter residual capacity, accumulated electric quantity, current power, communication state, ammeter working state and the like through the 4G communication chip U1.
In some embodiments, as shown in fig. 4 and 10, the power metering circuit further includes a USB interface module including a USB connector USB1;
the USB data positive electrode pin USB_DP of the 4G communication chip U1 is connected with the second positive electrode DP2 of the USB connector, and the second positive electrode DP2 of the USB connector is in short circuit with the first positive electrode DP1 of the USB connector;
the USB data negative electrode pin USB_DN of the 4G communication chip U1 is connected with the second negative electrode DN2 of the USB connector, and the second negative electrode DN2 of the USB connector is in short circuit with the first negative electrode DN1 of the USB connector;
the USB power supply access pin usb_vbus of the 4G communication chip U1 is connected to the first power supply input pin B4A9 of the USB connector to access the second working voltage vbat_4v provided by the power supply module 30, and the first power supply input pin VBUS of the USB connector is short-circuited with the second power supply input pin A4B9 of the USB connector.
In some embodiments, as shown in fig. 4 and 5, the power supply module 30 includes a first voltage conversion unit and a second voltage conversion unit;
the first voltage conversion unit is respectively connected with the live wire L and the zero wire N and is used for converting alternating-current commercial power into direct-current first working voltage;
the second voltage conversion unit is connected with the first voltage conversion unit, and is used for converting the first working voltage into the second working voltage VBAT_4V and the third working voltage VBAT_4V_IN, and outputting a RESET signal MCU_RESET.
In some embodiments, as shown in fig. 6, the second working voltage vbat_4v output by the power supply module 30 may be connected to a plurality of capacitors connected in parallel for filtering, and in addition, the second working voltage vbat_4v output by the power supply module 30 may be connected to the resistor R11 and the light emitting diode LED1 for lighting, where the content of the lighting may be the operating state of the electric meter.
In some embodiments, as shown in fig. 4 and 11, the electric energy metering circuit further comprises a timing module; the timing module comprises a timer U3 and a third triode Q6;
a RESET control pin RSTn of the timer U3 is connected to the RESET signal MCU_RESET;
the timing control pin HW_DOG/GPIO77 of the 4G communication chip U1 is connected with the emitter of the third triode Q6;
the base electrode of the third triode Q6 is connected to a third working voltage VDD_1V8, and the collector electrode of the third triode Q6 is connected to the third working voltage VDD_1V8 and is connected with a control pin DONE of the timer U3.
Specifically, the timer U3 may be TPL5010DDCR, and the electric energy metering module 40 is configured to meter electric energy of the input zero line current and live line current L, and convert the electric energy into electricity consumption information, thereby recording and sending the electricity consumption information to the cloud platform. The electric energy metering circuit is also provided with a hardware watchdog (namely a timing module of the electric energy metering circuit), and a time-sharing multiplexing technology is adopted on hardware according to requirements to realize calculation and control.
In a second aspect, an embodiment of the present application further provides an electric energy meter, where the electric energy meter includes a housing and the electric energy metering circuit of the first aspect, and the electric energy metering circuit is disposed in the housing.
After the electric energy meter is integrated into a power grid, in the embodiment, the electric energy meter sends electricity consumption to a cloud platform or a server of a power supply party through a cellular network such as a 4G cellular network by means of a cellular communication module 20 signal through an electric energy metering circuit, so that power grid management personnel can conveniently conduct relevant operations such as electricity selling, marketing, power outage and limitation management and the like.
Illustratively, an electric energy meter is connected in series between the device to be detected and its power supply, so as to calculate the current, voltage, power consumption information, etc. of the 220V ac current flowing therethrough. The electric energy meter can be used for a film printer in a hospital. The electric energy meter is communicated with the cloud platform through a 4G network, and the precondition of construction is whether network signals are normally available. For example: the printer is installed in the lead room of the hospital, and when the lead room is closed, the signal cannot penetrate and upload data. Only when someone enters the lead room, the lead room has a short signal of 'emission window period', and can work normally. Because the electric energy meter can acquire and send for 15 minutes due to the limitation of flow tariffs, periodic wake-up work exists. Therefore, the "emission window period" of the lead room signal cannot be predicted, so that data transmission failure and data blocking problem are caused, and the real-time performance of the data is deteriorated. The electric energy meter can collect data once every 15 minutes, namely electricity consumption information, and data caching is carried out when the data cannot be sent. In addition, the frequency of signal value inquiry of the 4G cellular network is increased, and when the signal value is detected to meet the transmission condition, data can be transmitted.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing has described in detail a power metering circuit and a power meter provided in the embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the foregoing examples are only for helping to understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An electrical energy metering circuit, comprising:
a first input connection line and a second input connection line; the second input connecting wire is a second phase live wire when the first input connecting wire is a first phase live wire, and the second input connecting wire is a zero wire when the first input connecting wire is a live wire;
the two input ends of the electric energy metering module are connected with the second input connecting line and are used for converting electric energy metering of current on the second input connecting line into electricity consumption information;
the cellular communication module is connected with the electric energy metering module and is used for uploading the electricity utilization information to a cloud platform;
and the two input ends of the power supply module are respectively connected with the first input connecting wire and the second input connecting wire and are used for acquiring electric energy from the first input connecting wire and supplying power for the cellular communication module.
2. The power metering circuit of claim 1 wherein the cellular communication module is a 4G communication module.
3. The power metering circuit of claim 2 wherein the 4G communication module comprises: a 4G communication chip and a first SIM card holder;
the antenna pin of the 4G communication chip is connected with an antenna;
the SIM data pin of the 4G communication chip is connected with the IO receiving and transmitting pin of the first SIM card holder;
the SIM clock pin of the 4G communication chip is connected with the clock signal output pin of the first SIM card holder;
the SIM reset control pin of the 4G communication chip is connected with the reset control pin of the first SIM card holder;
the SIM power control pin of the 4G communication chip is connected with the power input pin of the first SIM card holder, and the grounding pin of the first SIM card holder is grounded.
4. The electrical energy metering circuit of claim 3 wherein the 4G communication module further comprises an electrostatic protection tube;
the first pin of the electrostatic protection tube is connected with the IO receiving and transmitting pin of the first SIM card holder;
the third pin of the electrostatic protection tube is connected with the clock signal output pin of the first SIM card holder;
the fourth pin of the electrostatic protection tube is connected with the reset control pin of the first SIM card holder;
the second pin of the electrostatic protection tube is grounded, and the fifth pin of the electrostatic protection tube is connected to the first working voltage output by the power supply module.
5. The power metering circuit of claim 4 wherein the power metering module comprises a power metering chip, the 4G communication module further comprising a first connector;
the data receiving pin of the 4G communication chip is connected with the third pin of the first connector, and the third pin of the first connector is connected with the data transmitting pin of the electric energy metering chip;
the data transmitting pin of the 4G communication chip is connected with the eighth pin of the first connector, and the eighth pin of the first connector is connected with the data receiving pin of the electric energy metering chip.
6. The power metering circuit of claim 5 wherein the 4G communication module further comprises a switching unit and a control unit, the switching unit comprising a first transistor, a second transistor, the control unit comprising a first zero ohm resistance, a second zero ohm resistance, and a third zero ohm resistance;
the reset control pin of the 4G communication chip is connected with one end of the third zero ohm resistor, and the other end of the third zero ohm resistor is connected with the fourth pin of the first connector;
the on-off control pin of the 4G communication chip is respectively connected with one end of the first zero ohm resistor and one end of the second zero ohm resistor, the other end of the first zero ohm resistor is connected with the seventh pin of the first connector, and the other end of the second zero ohm resistor is grounded;
the state control pin of the 4G communication chip is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the fifth pin of the first connector;
the pilot lamp control pin of the 4G communication chip is connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the sixth pin of the first connector;
the first pin and the tenth pin of the first connector are respectively connected to the first working voltage, and the second pin and the ninth pin of the first connector are respectively grounded.
7. The power metering circuit of claim 6 further comprising a USB interface module, the USB interface module comprising a USB connector;
the USB data positive electrode pin of the 4G communication chip is connected with the second positive electrode of the USB connector, and the second positive electrode of the USB connector is in short circuit with the first positive electrode of the USB connector;
the USB data negative electrode pin of the 4G communication chip is connected with the second negative electrode of the USB connector, and the second negative electrode of the USB connector is in short circuit with the first negative electrode of the USB connector;
the USB power supply access pin USB of the 4G communication chip is connected with the first power supply input pin of the USB connector to access the second working voltage provided by the power supply module, and the first power supply input pin of the USB connector is in short circuit with the second power supply input pin of the USB connector.
8. The electrical energy metering circuit of claim 7 wherein the power supply module comprises a first voltage conversion unit and a second voltage conversion unit;
the first voltage conversion unit is respectively connected with the live wire and the zero wire and is used for converting alternating-current commercial power into direct-current first working voltage;
the second voltage conversion unit is connected with the first voltage conversion unit, and is used for converting the first working voltage into the second working voltage and the third working voltage and outputting a reset signal.
9. The power metering circuit of claim 8 further comprising a timing module; the timing module comprises a timer and a third triode;
the reset control pin of the timer is connected with the reset signal;
the timing control pin of the 4G communication chip is connected with the emitter of the third triode;
and the base electrode of the third triode is connected with a third working voltage, and the collector electrode of the third triode is connected with the third working voltage and is connected with the control pin of the timer.
10. An electric energy meter, characterized in that it comprises a housing and an electric energy metering circuit according to any one of claims 1-8, said electric energy metering circuit being arranged in said housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322422821.1U CN220730317U (en) | 2023-09-06 | 2023-09-06 | Electric energy metering circuit and electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322422821.1U CN220730317U (en) | 2023-09-06 | 2023-09-06 | Electric energy metering circuit and electric energy meter |
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| CN220730317U true CN220730317U (en) | 2024-04-05 |
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| CN202322422821.1U Active CN220730317U (en) | 2023-09-06 | 2023-09-06 | Electric energy metering circuit and electric energy meter |
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| CN (1) | CN220730317U (en) |
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