CN2557955Y - Electricity cut off detector for electricity meter - Google Patents
Electricity cut off detector for electricity meter Download PDFInfo
- Publication number
- CN2557955Y CN2557955Y CN 02241325 CN02241325U CN2557955Y CN 2557955 Y CN2557955 Y CN 2557955Y CN 02241325 CN02241325 CN 02241325 CN 02241325 U CN02241325 U CN 02241325U CN 2557955 Y CN2557955 Y CN 2557955Y
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- chip
- cpu
- ammeter
- power loss
- detection means
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Abstract
The utility model relates to a detection electric instrument, in particular to an electric instrument power-fail detection device which can ensure data not to lose after the power-fail of the municipal electric network. The utility model voltage and current samplings are converted by A / D and then input into a CPU, the CPU data are read by a meter reading system through a communication interface, and the electric instrument data are displayed by an LCD. The utility model is characterized in that an IC 16 F 77 chip is adopted for the CPU, the power-fail detection end of the CPU is connected with a comparator, and the power supply end of the CPU is connected with a resistance voltage divider network and then is output to the comparator. Compared with the prior art, the utility model has the advantages of ensuring the data not to lose and upper and lower circular display.
Description
Technical field
The utility model has related to a kind of detection ammeter, be specially adapted to city's net power down after, can guarantee the ammeter power loss detection means that data are not lost.
Background technology
The all battery-powered cpu chip of giving of the detection ammeter of prior art can not power down, otherwise data can not preserve, and forms and loses the electric quantity data phenomenon, and influence detects the accuracy of data.
In order to overcome the deficiencies in the prior art, after the utility model provided the net power down of a kind of city, just cpu chip work a period of time was with the ammeter power loss detection means that guarantees that data are not lost.
Technical scheme
The purpose of this utility model is achieved by the following technical solution: the of the present utility model conversion through A/D by voltage, current sample imported CPU, kilowatt meter reading-out system reads cpu data by communication interface, ammeter data is shown by LCD, it is characterized in that CPU adopts the PIC16F77 chip, its detection of power loss end connects comparer, power output end is input to comparer after connecting resistance pressure-dividing network.
Of the present utility model+12V power output end connects resistance pressure-dividing network, exports an electric resistance partial pressure and outputs to comparer with+5V voltage, is connected diode-isolated between+5V power supply and the+12V power supply.Resistance pressure-dividing network is made up of resistance R 53, R54, and described isolating diode is made up of D102, D23, D24.Comparer adopts the LM311 chip, and+5V power supply is connected with farad capacitor or electrochemical capacitor.
Turn on PIC16F77 chip of the present utility model connects manually respectively and manually turn over button ANJ2, ANJ3 down, the PIC16F77 chip also can be alternative by the PIC16F74 chip in addition.
The utility model is compared with existing technology to have the data of guaranteeing and not to lose, and can go up advantages such as showing, show down the demonstration that circulates.
Description of drawings
Fig. 1 is circuit pivot figure of the present utility model.
Fig. 2 is a physical circuit schematic diagram of the present utility model.
Fig. 3 is a main program flow chart of the present utility model.
Fig. 4 is an interruption subroutine process flow diagram of the present utility model.
Specific embodiment
Below in conjunction with description of drawings the utility model is described in further detail: as shown in Figure 1, the utility model is of the present utility model by voltage, behind the current sample, carry out the A/D conversion through the ADE7755 of IC chip, and input CPU, the handheld POS machine programming is checked meter and centralized meter-reading system reads cpu data by infrared communication interface and 485 communication interfaces respectively, ammeter data is by LCD, RTC shows, CPU adopts the PIC16F77 chip, its detection of power loss end connects comparer IC311, after power supply+12V output terminal connects resistance pressure-dividing network, resistance pressure-dividing network is by resistance R 53, R54 forms, and exports an electric resistance partial pressure and+5V voltage to being input to comparer IC311.As shown in Figure 2, of the present utility model+12V power output end connects resistance pressure-dividing network, resistance pressure-dividing network is made of R53 and R54, exports an electric resistance partial pressure and outputs to the LM311 comparer with+5V voltage, is connected diode-isolated between+5V power supply and the+12V power supply.Described isolating diode is made up of D102, D23, D24.Comparer adopts the LM311 chip, and+5V power supply is connected with farad capacitor or electrochemical capacitor C26.Turn on PIC16F77/PIC16F74 chip of the present utility model connects manually respectively and manually turn over button ANJ2, ANJ3 down, the PIC16F77 chip also can be alternative by the PIC16F74 chip in addition.Detect AN3 with the PIC16F77/PIC16F74 chip and manually go up and show/the manual apparent push button signalling down of AN2, as detect the AN3 push button signalling, turning over circulation on carrying out and showing, as detecting the AN2 push button signalling, descend turn over the circulation demonstration.Detect power down with the PIC16F77/PIC16F74 chip, the battery no-voltage, EEPROM is bad, RTC is bad, pulse measurement, read/with EEPROM, read/with RTC, and infrared/485 communications, carry out data management with electric system.Above-mentioned principle is as the main program block diagram of Fig. 3 and the interruption subroutine block diagram of Fig. 4.
Claims (6)
1, a kind of ammeter power loss detection means, import CPU by voltage, current sample through the A/D conversion, kilowatt meter reading-out system reads cpu data by communication interface, ammeter data is shown by LCD, it is characterized in that CPU adopts the PIC16F77 chip, its detection of power loss end connects comparer, and power output end is input to comparer after connecting resistance pressure-dividing network.
2, ammeter power loss detection means according to claim 1, it is characterized in that described+12V power output end connects resistance pressure-dividing network, export an electric resistance partial pressure and output to comparer, be connected diode-isolated between+5V power supply and the+12V power supply with+5V voltage.
3, ammeter power loss detection means according to claim 2 is characterized in that described resistance pressure-dividing network is made up of resistance R 53, R54, and described isolating diode is made up of D102, D23, D24.
4, ammeter power loss detection means according to claim 2, the comparer that it is characterized in that adopts the LM311 chip, and+5V power supply is connected with farad capacitor or electrochemical capacitor.
5, ammeter power loss detection means according to claim 1, it is characterized in that described PIC16F77 chip turns on connecting manually respectively and manually under turn over button ANJ2, ANJ3.
6, ammeter power loss detection means according to claim 1 or 5, the PIC16F77 chip that it is characterized in that also can be substituted by the PIC16F74 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02241325 CN2557955Y (en) | 2002-06-27 | 2002-06-27 | Electricity cut off detector for electricity meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02241325 CN2557955Y (en) | 2002-06-27 | 2002-06-27 | Electricity cut off detector for electricity meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2557955Y true CN2557955Y (en) | 2003-06-25 |
Family
ID=33714198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02241325 Expired - Fee Related CN2557955Y (en) | 2002-06-27 | 2002-06-27 | Electricity cut off detector for electricity meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2557955Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN103105821A (en) * | 2012-12-31 | 2013-05-15 | 深圳市配天数控科技有限公司 | Machine tool processing coordinate power down saving system and method |
| CN103616660A (en) * | 2013-12-02 | 2014-03-05 | 国家电网公司 | Power-down processing reliability test device and method for intelligent ammeters in interference environment |
| CN106199098A (en) * | 2016-06-22 | 2016-12-07 | 华立科技股份有限公司 | Under ammeter power-down state, low-power consumption during electrical network full decompression exception detects control method |
-
2002
- 2002-06-27 CN CN 02241325 patent/CN2557955Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN102338823B (en) * | 2010-07-27 | 2015-08-26 | 深圳长城开发科技股份有限公司 | The power failure detection method of electric meter system and circuit |
| CN103105821A (en) * | 2012-12-31 | 2013-05-15 | 深圳市配天数控科技有限公司 | Machine tool processing coordinate power down saving system and method |
| CN103616660A (en) * | 2013-12-02 | 2014-03-05 | 国家电网公司 | Power-down processing reliability test device and method for intelligent ammeters in interference environment |
| CN103616660B (en) * | 2013-12-02 | 2016-05-25 | 国家电网公司 | The testing arrangement of power down process reliability and method under intelligent electric energy meter interference environment |
| CN106199098A (en) * | 2016-06-22 | 2016-12-07 | 华立科技股份有限公司 | Under ammeter power-down state, low-power consumption during electrical network full decompression exception detects control method |
| CN106199098B (en) * | 2016-06-22 | 2019-01-22 | 华立科技股份有限公司 | Low-power consumption under ammeter power-down state when the full decompression exception of power grid detects control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |