CN105425029A - Low-power-consumption single-phase smart electric energy meter - Google Patents
Low-power-consumption single-phase smart electric energy meter Download PDFInfo
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- CN105425029A CN105425029A CN201510266451.4A CN201510266451A CN105425029A CN 105425029 A CN105425029 A CN 105425029A CN 201510266451 A CN201510266451 A CN 201510266451A CN 105425029 A CN105425029 A CN 105425029A
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Abstract
The invention provides a low-power-consumption single-phase smart electric energy meter and a usage method thereof, and the low-power-consumption single-phase smart electric energy meter uses a storage chip and a magneto-couple isolation chip ADUM1241. The low-power-consumption single-phase smart electric energy meter has the advantages of low power consumption, the long service life, high performance, high reliability and the like especially in magnetic isolation. The maximum power consumption of the magneto-couple chip is 84 mW, the maximum power consumption of an optocoupler is 200 mW, so that power can be saved by around 60%. Through application of the technology, power consumption of the electric energy meter and power consumption at a battery power supply state are solved, and a problem of battery undervoltage is solved.
Description
Technical field
The invention belongs to electromagnetic measurement field, be specifically related to a kind of intelligent electric energy meter, especially low-power consumption high stability electric energy meter.
Background technology
Intelligent electric energy meter is more and more stricter to the requirement of power consumption, and the power consumption of electric energy meter self when will control normally to measure on the one hand, on the other hand when having a power failure, electric energy meter will ensure the power consumption of real-time clock work and the power consumption of liquid crystal display.Current product is perfect not enough in Low-power Technology, the phenomenon of ubiquity battery undervoltage.
Such as a kind of network KWH meter for gathering dispersion user electric energy meter information in section disclosed in the application of No. 200510032688th, Chinese patent, it is 1) network KWH meter take microprocessor as core, the microcomputer system be made up of communication module, display module, human-machine interface module, data processing module etc.; 2) network KWH meter gathers the electric flux of single user electrical energy metering device, multi-user's electric flux centralized measure device or undernet formula ammeter by such as Ethernet, CANBUS, PROFBUS or other high-speed industrial fieldbus, be stored in data processing module, also can be forwarded by wired or wireless communication mode superior centralised arrangement; 3) network KWH meter can according to the requirement of concrete practical application, arrange or display module on the spot is not set, occasion for manual metering can read the active electrical degree of all single electric energy meters of its subordinate, idle electricity by network type ammeter, also can check the work state information of its subordinate's ammeter; 4) network KWH meter can be independently electric flux inquiry system, also can depend on other electronic installation.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of low-power consumption single-phase intelligent electric energy meter, it adopts multiple low-power consumption process means, reduces the power consumption under electric energy meter oneself power consumption and battery-powered state, solves the problem of battery undervoltage.
According to a first aspect of the present invention, there is provided a kind of low-power consumption single-phase intelligent electric energy meter, it comprises: power circuit, voltage sampling circuit, current sampling circuit, computation chip circuit, memory circuit, control circuit, liquid crystal display, infrared communication module, 485 communication modules, carrier communication module, ESAM security module and microprocessor; Wherein, power circuit is that modules circuit is powered; Voltage sampling circuit and current sampling circuit are input to the collection port of computation chip; Computation chip be used for electric energy metering and by spi bus and microprocessor communication; Memory circuit passes through I2C bus and microprocessor communication, for information such as storing electricity; Microprocessor exports switching on signal, Drive and Control Circuit according to power consumption and payment information, controls user power utilization; The information such as liquid crystal display display electricity, power, voltage, electric current; Infrared communication module, 485 communication modules, carrier communication module are all by UART mouth and microprocessor communication; ESAM module adds the security of electric energy meter, only has and could rewrite electric energy meter data by authentication.
Further, memory circuit uses storage chip, storage chip is by microprocessor I/O pin powered, I/O pin output low level under default conditions, storage chip does not work, not power consumption, only has when needing access data, and microprocessor just control I/O pin exports high level, for storage chip is powered, storage chip exchanges data by I2C bus and microprocessor; The communication module such as RS485, carrier wave all connects the UART mouth of microprocessor through the isolation of magnetic coupling; Photoresistance R1 mono-termination power end, the other end contact resistance R2 of photoresistance R1 and the AD interface of microprocessor; The AD interface of resistance R2 mono-termination photoresistance and microprocessor, the other end earth terminal of resistance R2.
Further, the I2C interface CPU_SDA that the I2C interface CPU_SCL that the VCC port of the equal earth terminal of A0, A1, A2 and VSS of storage chip U1, storage chip U1 connects the general purpose I/O interface CPU_I/O end of microprocessor, the WP port earth terminal of storage chip U1, the SCL port of storage chip U1 connect microprocessor holds, the SDA port of storage chip U1 connects microprocessor holds; Electric capacity C1 is connected in parallel between the VCC port of storage chip U1 and WP port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SCL port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SDA port.
Preferably, the data that data receiver RX, V1B port is held with connecing data sending terminal TX, GND1 terminated communications modular power source of communication module, VOA/VIA port connects microprocessor that the VIA/VOA port of the magnetic lotus root isolating chip U2 used in low-power consumption single-phase intelligent electric energy meter connects communication module are sent to data receiver CPU_RX, GND2 port that CPU_TX, VOB port connects microprocessor and hold with connecing power supply of microprocessor; Electric capacity C2 and resistance R4 is all connected on the VDD1 port of communication module power end VCCM and magnetic lotus root isolating chip U2; Electric capacity C3 and resistance R5 is all connected on the VDD2 port of power supply of microprocessor end VCC and magnetic lotus root isolating chip U2.
According to a second aspect of the present invention, a kind of method using above-mentioned low-power consumption single-phase intelligent electric energy meter is provided, it is characterized in that:
Use photoresistance to monitor bright situation, when light is dark, press and follow aobvious button and can light backlight, when illumination is good, no matter whether user pushes button, and LCD backlight does not all work, to reach power savings;
Step describes:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing);
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data; If the non-power down of electric energy meter, continue metering electric energy;
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation;
4th step, judges whether electric energy meter ambient light becomes clear, and bright light then closes backlight; Rather dark, continue to judge whether to follow aobvious, follow and aobviously then light backlight, otherwise close backlight;
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively;
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning etc.;
6th step, terminates.
Advantage of the present invention: 1. electric energy meter overall power is low.2. replace traditional light-coupled isolation chip with magnetic coupling isolating chip, devise magnetic coupling buffer circuit.3. light LCD backlight under avoiding light kilter, devise photoresistance testing circuit.4. decrease eeprom chip stand-by power consumption.5. hardware design modularization, Software for Design standardization, product up-gradation and maintenance are convenient in the increase of embedded program versatility.The present invention is safe and reliable, low in energy consumption, economical and social benefit is good.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of low-power consumption single-phase intelligent electric energy meter;
Fig. 2 is the electrical block diagram of low-power consumption single-phase intelligent electric energy meter;
Fig. 3 is the storage chip circuit theory diagrams of low-power consumption single-phase intelligent electric energy meter;
Fig. 4 is the magnetic coupling buffer circuit schematic diagram of low-power consumption single-phase intelligent electric energy meter;
Fig. 5 is the program flow diagram of low-power consumption single-phase intelligent electric energy meter;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
In electric energy meter of the present invention, employ magnetic coupling, magnetic coupling is a kind of digital isolator, alternative optocoupler, and is better than optocoupler at everyways such as speed, power consumption, usabilities.Different from optocoupler, magnetic coupling is the transformer isolation technology based on chip-scale, and not through the photoelectric conversion process of optocoupler, and volume is far smaller than traditional photoelectric coupled device, and advantage in low-power consumption scheme is more obvious
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
With reference to accompanying drawing 1, show in particular the structured flowchart of low-power consumption single-phase intelligent electric energy meter, low-power consumption single-phase intelligent electric energy meter comprises: power circuit, voltage sampling circuit, current sampling circuit, computation chip circuit, memory circuit, control circuit, liquid crystal display, infrared communication module, 485 communication modules, carrier communication module, ESAM security module and microprocessor.Power circuit is that modules circuit is powered; Voltage sampling circuit and current sampling circuit are input to the collection port of computation chip; Computation chip be used for electric energy metering and by spi bus and microprocessor communication; Memory circuit passes through I2C bus and microprocessor communication, for information such as storing electricity; Microprocessor exports switching on signal, Drive and Control Circuit according to power consumption and payment information, controls user power utilization; The information such as liquid crystal display display electricity, power, voltage, electric current; Infrared communication module, 485 communication modules, carrier communication module are all by UART mouth and microprocessor communication; ESAM module adds the security of electric energy meter, only has and could rewrite electric energy meter data by authentication.
With reference to accompanying drawing 2, provide the electrical block diagram of low-power consumption single-phase intelligent electric energy meter further, storage chip is by microprocessor I/O pin powered, under default conditions, I/O pin output low level, storage chip does not work, not power consumption, only have when needing access data, microprocessor just control I/O pin exports high level, and for storage chip is powered, storage chip exchanges data by I2C bus and microprocessor; The communication module such as RS485, carrier wave all connects the UART mouth of microprocessor through the isolation of magnetic coupling; Photoresistance R1 mono-termination power end, the other end contact resistance R2 of photoresistance R1 and the AD interface of microprocessor; The AD interface of resistance R2 mono-termination photoresistance and microprocessor, the other end earth terminal of resistance R2.
With reference to accompanying drawing 3, provide the storage chip circuit theory diagrams of low-power consumption single-phase intelligent electric energy meter further, the I2C interface CPU_SDA that the I2C interface CPU_SCL end that the equal earth terminal of A0, A1, A2 and VSS of storage chip U1, the VCC port of storage chip U1 connect the general purpose I of microprocessor/O interface CPU_I/O end, the WP port earth terminal of storage chip U1, the SCL port of storage chip U1 connect microprocessor, the SDA port of storage chip U1 connect microprocessor holds; Electric capacity C1 is connected in parallel between the VCC port of storage chip U1 and WP port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SCL port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SDA port.
With reference to accompanying drawing 4, provide the magnetic coupling buffer circuit schematic diagram of low-power consumption single-phase intelligent electric energy meter further, the data that data receiver RX, V1B port is held with connecing data sending terminal TX, GND1 terminated communications modular power source of communication module, VOA/VIA port connects microprocessor that the VIA/VOA port of magnetic lotus root isolating chip U2 connects communication module are sent to data receiver CPU_RX, GND2 port that CPU_TX, VOB port connects microprocessor and hold with connecing power supply of microprocessor; Electric capacity C2 and resistance R4 is all connected on the VDD1 port of communication module power end VCCM and magnetic lotus root isolating chip U2; Electric capacity C3 and resistance R5 is all connected on the VDD2 port of power supply of microprocessor end VCC and magnetic lotus root isolating chip U2.
With reference to accompanying drawing 5, provide the workflow diagram of low-power consumption single-phase intelligent electric energy meter further.
Use photoresistance to monitor bright situation, when light is dark, press and follow aobvious button and can light backlight, when illumination is good, no matter whether user pushes button, and LCD backlight does not all work, to reach power savings.
Step describes:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing).
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data.If the non-power down of electric energy meter, continue metering electric energy.
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation.
4th step, judges whether electric energy meter ambient light becomes clear, and bright light then closes backlight; Rather dark, continue to judge whether to follow aobvious, follow and aobviously then light backlight, otherwise close backlight.
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively.
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning etc.
6th step, terminates.
Core design thought of the present invention is: (1) storage chip is powered by microprocessor I/O pin, under default conditions, I/O pin output low level, storage chip does not work, not power consumption, only have when needing access data, microprocessor just control I/O pin exports high level, for storage chip is powered, and by I2C bus access data.So just can save the electric energy that storage chip waiting time consumes.(2) light-coupled isolation chip LTV816S is replaced with magnetic coupling isolating chip ADUM1241.Light-coupled isolation adopts photo-coupler to isolate exactly, and the structure of photo-coupler is equivalent to light emitting diode and photosensitive tube to be packaged together, light emitting diode input electric signal be converted to light signal pass to photosensitive tube be converted to electric signal export.Magnetic isolation is the isolation technology based on chip-scale transformer, and Magnetic isolation has the advantages such as low in energy consumption, long-life, high-performance, high reliability.The maximum power consumption of magnetic coupling chip is 84mW, and the maximum 200mW of optocoupler power consumption, can economize on electricity about 60%.(3) photoresistance sampled signal is input to microprocessor A/D port, the light conditions of monitoring electric energy meter environment for use.When illumination is good, no matter whether user pushes button, and LCD backlight does not all work, to reach power savings.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (5)
1. a low-power consumption single-phase intelligent electric energy meter, it comprises: power circuit, voltage sampling circuit, current sampling circuit, computation chip circuit, memory circuit, control circuit, liquid crystal display, infrared communication module, 485 communication modules, carrier communication module, ESAM security module and microprocessor;
It is characterized in that, power circuit is that modules circuit is powered; Voltage sampling circuit and current sampling circuit are input to the collection port of computation chip; Computation chip be used for electric energy metering and by spi bus and microprocessor communication; Memory circuit passes through I2C bus and microprocessor communication, for information such as storing electricity; Microprocessor exports switching on signal, Drive and Control Circuit according to power consumption and payment information, controls user power utilization; The information such as liquid crystal display display electricity, power, voltage, electric current; Infrared communication module, 485 communication modules, carrier communication module are all by UART mouth and microprocessor communication; ESAM module adds the security of electric energy meter, only has and could rewrite electric energy meter data by authentication.
2. according to low-power consumption single-phase intelligent electric energy meter according to claim 1, it is characterized in that, memory circuit uses storage chip, storage chip by microprocessor I/O pin powered, I/O pin output low level under default conditions, storage chip does not work, not power consumption, only have when needing access data, microprocessor just control I/O pin exports high level, and for storage chip is powered, storage chip exchanges data by I2C bus and microprocessor; The communication module such as RS485, carrier wave all connects the UART mouth of microprocessor through the isolation of magnetic coupling; Photoresistance R1 mono-termination power end, the other end contact resistance R2 of photoresistance R1 and the AD interface of microprocessor; The AD interface of resistance R2 mono-termination photoresistance and microprocessor, the other end earth terminal of resistance R2.
3. according to low-power consumption single-phase intelligent electric energy meter according to claim 2, it is characterized in that, the I2C interface CPU_SDA that the I2C interface CPU_SCL end that the equal earth terminal of A0, A1, A2 and VSS of storage chip U1, the VCC port of storage chip U1 connect the general purpose I of microprocessor/O interface CPU_I/O end, the WP port earth terminal of storage chip U1, the SCL port of storage chip U1 connect microprocessor, the SDA port of storage chip U1 connect microprocessor holds; Electric capacity C1 is connected in parallel between the VCC port of storage chip U1 and WP port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SCL port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SDA port.
4. according to low-power consumption single-phase intelligent electric energy meter according to claim 1, it is characterized in that, the data that data receiver RX, V1B port is held with connecing data sending terminal TX, GND1 terminated communications modular power source of communication module, VOA/VIA port connects microprocessor that the VIA/VOA port of magnetic lotus root isolating chip U2 connects communication module are sent to data receiver CPU_RX, GND2 port that CPU_TX, VOB port connects microprocessor and hold with connecing power supply of microprocessor; Electric capacity C2 and resistance R4 is all connected on the VDD1 port of communication module power end VCCM and magnetic lotus root isolating chip U2; Electric capacity C3 and resistance R5 is all connected on the VDD2 port of power supply of microprocessor end VCC and magnetic lotus root isolating chip U2.
5. use a method for low-power consumption single-phase intelligent electric energy meter described in the claims, it is characterized in that:
Use photoresistance to monitor bright situation, when light is dark, press and follow aobvious button and can light backlight, when illumination is good, no matter whether user pushes button, and LCD backlight does not all work, to reach power savings;
Step describes:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing);
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data; If the non-power down of electric energy meter, continue metering electric energy;
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation;
4th step, judges whether electric energy meter ambient light becomes clear, and bright light then closes backlight; Rather dark, continue to judge whether to follow aobvious, follow and aobviously then light backlight, otherwise close backlight;
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively;
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning etc.;
6th step, terminates.
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Cited By (3)
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| CN106443171A (en) * | 2016-08-31 | 2017-02-22 | 北京智联信技术有限公司 | System and method for metering data of power bus during power failure of power utilization equipment |
| CN106526267A (en) * | 2016-12-21 | 2017-03-22 | 武汉阿迪克电子股份有限公司 | Single-phase intelligent electricity-stealing-prevention electric energy meter and method for reducing power consumption |
| CN108537317A (en) * | 2018-03-08 | 2018-09-14 | 新智数字科技有限公司 | Bluetooth rechargeable card and recharge method |
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Application publication date: 20160323 |