CN201548617U - Battery-free intelligent ammeter - Google Patents
Battery-free intelligent ammeter Download PDFInfo
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- CN201548617U CN201548617U CN200920277926XU CN200920277926U CN201548617U CN 201548617 U CN201548617 U CN 201548617U CN 200920277926X U CN200920277926X U CN 200920277926XU CN 200920277926 U CN200920277926 U CN 200920277926U CN 201548617 U CN201548617 U CN 201548617U
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000003139 buffering effect Effects 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
- 230000006872 improvement Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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Abstract
The utility model relates to a battery-free intelligent ammeter. The ammeter comprises a sampling circuit, a buffering amplification circuit, an A/D conversion operation processor, a CPU, an electric energy pulse circuit and a clock circuit, wherein the sampling circuit is connected with the A/D conversion operation processor through the buffering amplification circuit, the A/D conversion operation processor is connected with the CPU, the CPU is connected with the electric energy pulse circuit and the clock circuit, the clock circuit is connected with a double layer capacitor, and the double layer capacitor provides electricity for the operation of the clock circuit under the condition of power off. The ammeter of the utility model is provided with emergency metering function, can store user power consumption information under the condition that a real time clock is lost, maintains power supply of the clock through the double layer capacitor, prevents the loss of the real time clock, guarantees accurate record and storage of user power consumption information, eliminates the influence of battery service life on the overall service life of the intelligent ammeter, prolongs the service life of the intelligent ammeter, and lowers the cost.
Description
Technical field:
The utility model relates to electric system electric energy metrical field, a kind of specifically no battery intelligent ammeter that satisfies intelligent grid to the electric energy metrical requirement.
Background technology:
The mechanical type ammeter that China is early stage, groundwork principle are that the field drives rotating mechanism measures, and the total meritorious electric weight of general only metering or total capacity of idle power need not to use battery.Along with the enforcement of time-of-use tariffs, large quantities of state type ammeters come into operation, and user's electricity consumption historical data and peak interval of time splitting scheme all need be preserved when ammeter has a power failure, and the clock of state type ammeter also need be kept operation by battery when having a power failure.Along with data storage and preservation development of technology, a large amount of power informations except that real-time clock and data can be preserved by long-life Flash chip, because under power down mode, user's above-mentioned data and information can not change, and the main effect that is installed in the battery of state type ammeter at present is exactly the operation of keeping real-time clock.Use battery to have a lot of shortcomings: the production run serious environment pollution of battery; The recovery of battery does not also have good solution; A large amount of batteries need import, cause the ammeter cost to strengthen; Especially differ greatly the serviceable life of other parts of the serviceable life of battery and state type ammeter, serious restriction the serviceable life of state type ammeter.
At present, China has determined to start the construction of intelligent grid comprehensively, and the intelligent electric meter consumption that is important component part as the senior amount lateral body of intelligent power is huge.Real-time clock becomes the key factor of intelligent power re-set price, if the mode that continues to adopt battery to keep solves, certainly will cause the huge waste of fund.
The utility model content:
The utility model purpose is, a kind of no battery intelligent ammeter is provided, this ammeter adopts farad capacitor to keep the clock power supply in the time of and having a power failure in standby, turnover, prevent that real-time clock from losing, start the metering emergency mechanism, and eliminated the influence of battery life to the intelligent electric meter bulk life time, prolong the serviceable life of intelligent electric meter.
For achieving the above object, the utility model provides a kind of no battery intelligent ammeter, its improvement is: described ammeter comprises: sample circuit, buffer amplifier circuit, A/D translation operation processor, CPU, electrical energy pulse circuit and clock circuit, described sample circuit is connected with A/D translation operation processor through buffer amplifier circuit, described A/D translation operation processor is connected with CPU, described CPU connects electrical energy pulse circuit and clock circuit, described clock circuit is connected with farad capacitor, described CPU, sample circuit is connected with power supply with farad capacitor, and described farad capacitor is the operation power supply of clock circuit under the power-off condition.
An optimal technical scheme of the present utility model is: described a kind of improvement of not having the battery intelligent ammeter is, described sample circuit comprises current sampling circuit and voltage sample circuit, described buffer amplifier circuit comprises current buffering amplifying circuit and voltage buffer amplifier circuit, described current sampling circuit connects A/D translation operation processor through the current buffering amplifying circuit, and described voltage sample circuit connects A/D translation operation processor through the voltage buffer amplifier circuit.
Another optimal technical scheme of the utility model is: described a kind of improvement of not having the battery intelligent ammeter is that described CPU is connected with high capacity flash storage chip.
The utility model an optimal technical scheme is: described a kind of improvement of not having the battery intelligent ammeter is that the output terminal of described CPU is connected with alarm, LCD display, infrared equipment, keyboard and RS-485 interface.
A preferred technical scheme of the present utility model is: described a kind of improvement of not having the battery intelligent ammeter is that described infrared equipment and handheld reading meter device communicate.
The utility model beneficial effect: adopt farad capacitor to keep the operation of real-time clock, design simultaneously has emergent function of measuring under the situation that is implemented in real-time clock and loses user power utilization information is stored, both combine, accurate recording and preservation have been guaranteed to user power utilization information, satisfy the requirement of intelligent power fully, it is very long that farad capacitor discharges and recharges the life-span, can reach 500000 times or 90000h prolongs serviceable life of intelligent electric meter, reduces the cost of intelligent electric meter.
Description of drawings:
The new no battery intelligent ammeter type structured flowchart of this practicality of Fig. 1;
Fig. 2 farad capacitor duration of charging curve map;
Fig. 3 farad capacitor curve map discharge time.
Embodiment:
As shown in Figure 1, the no battery intelligent ammeter that provides of the utility model comprises: sample circuit, buffer amplifier circuit, A/D translation operation processor 2, CPU 1, electrical energy pulse circuit and clock circuit.Sample circuit comprises current sampling circuit 21 and voltage sample circuit 22, buffer amplifier circuit comprises current buffering amplifying circuit 23 and voltage buffer amplifier circuit 24, current sampling circuit 21 connects A/D translation operation processor 2 through current buffering amplifying circuit 23, and voltage sample circuit 22 connects A/D translation operation processor 2 through voltage buffer amplifier circuit 24.A/D translation operation processor 2 is connected with CPU 1.CPU 1 output terminal is connected with alarm 11, LCD display 12, send infrared device 13, infrared receiving device 14, button 15 and RS-485 interface 16.Send infrared device 13 and infrared receiving device 14 communicate with handheld reading meter device 10.CPU 1 also is connected with high capacity flash storer 7.CPU 1 also is connected with electrical energy pulse circuit 3 and clock circuit 4, and clock circuit 3 connects farad capacitor 5, is the operation power supply of clock circuit 4 under the power-off condition by farad capacitor 5.CPU1, sample circuit and farad capacitor 4 are all by power supply 6 power supplies.
The course of work of the emergent metering mechanism of the utility model intelligent electric meter is as follows:
The real-time clock of intelligent electric meter has only by just meaningful after the time service of intelligent power system.When ammeter is having a power failure when powering on again, if real-time clock is lost, intelligent electric meter can start the metering emergency mechanism immediately, though there is not real-time clock, intelligent electric meter but can be with user's power information by minute storing, time can reach 48 hours, as long as intelligent electric meter obtains the time service of main station system in 48 hours, just can be to the data based real-time clock that obtains of storage, the anti-minute real-time clock of the power information of storage that pushes, the principle of work of intelligent electric meter when putting into operation is also identical therewith.
But certain once have a power failure power on again after, intelligent electric meter might in time not obtain time service.In this case,, will cause the time interval between the emergent storage data of the emergent storage data that had a power failure last time and this power failure to be difficult to accurate calculating, the anti-serious problems that push away the real-time clock mistake of power information will occur if having a power failure once more.The utility model intelligent electric meter adopts farad capacitor to keep the operation of real-time clock under the power-off condition, just can guarantee that the time interval between the emergent storage of the twice power failure in these cases data can access record accurately, thereby remedied under the situation of double power failure in the short time, intelligent electric meter is lost the anti-problem that pushes away the real-time clock mistake of the power information that is caused owing to can not in time obtaining the time service of intelligent power system.Because this situation off interval is very short, adopt farad capacitor can guarantee that fully real-time clock can not lose.
The utility model intelligent electric meter adopts farad capacitor to keep illustrating of real-time clock operation:
As shown in table 1, for example with the farad capacitance parameter
Table 1 farad capacitor parameter
| Model | Voltage (V) | Nominal capacity (F) | ESR(Ω) | 30min (μ the A)/24h self discharge (V) of leaking electricity | Size W * L * H (mm) ± 2 | F(mm)±0.5 | d(mm)±0.05 |
| SE-5R0-Z474VY | 5 | 0.47 | 1.2(0.2，0.6) | 150/ | 9×17×16 | 12 | 0.6 |
As the charging of Fig. 2, NEC0.47/5V capacitor shown in Figure 3, discharge time curve.
Then the farad capacitor calculation specifications of holding time are as follows:
With clock chip PCF2123 commonly used is example: under 1.5 volts of power supply supplies, can under the electric current that is lower than 100 nanoamperes, move, the power consumption of this real-time clock is lower than 0.15 microwatt, if use NEC 0.47F/5V farad capacitor to keep clock, it is as follows then to keep the real-time clock time formula:
Power consumption: 0.15 microwatt=0.00000015 watt
The electric energy that is full of storage is: 0.5 * C * U
2=0.5 * 0.47 * 5 * 5=5.875 (coulomb)
Unavailable electric energy is: 0.5 * C * U
2=0.5 * 0.47 * 1.5 * 1.5=0.52875 (coulomb)
Available electrical energy is: 5.875-0.52875=5.34625 (coulomb)
Electric capacity can be held time: 5.34625/ (0.00000015 * 3600 * 24)=412 day=1.13 years
Chong Dian computing formula then: be charged to 5 volts of times that need from 0 volt:
U＝Q/C，Q＝I×t；
So t=u * c/i=5 * 0.47/i=157s (i=15mA)
t＝u×c/i＝5×0.47/i＝94s(i＝25mA)
t＝u×c/i＝5×0.47/i＝47s(i＝50mA)
By above calculating, illustrate that farad capacitor can keep the operation of short time real-time clock when having a power failure fully, and can guarantee to power on again when having a power failure again having a power failure that utilize of short duration power-on time rapid charge, electric energy is kept clock for a long time whereby.
Should illustrate at last; above embodiment is only in order to explanation the technical solution of the utility model but not it is limited; although the utility model is had been described in detail with reference to the foregoing description; described art is to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and not break away from all should being encompassed in of the utility model spirit and scope claim protection domain of the present utility model.
Claims (5)
1. no battery intelligent ammeter, it is characterized in that: described ammeter comprises: sample circuit, buffer amplifier circuit, A/D translation operation processor (2), CPU (1), electrical energy pulse circuit (3) and clock circuit (4), described sample circuit is connected with A/D translation operation processor (2) through buffer amplifier circuit, described A/D translation operation processor (2) is connected with CPU (1), described CPU (1) connects electrical energy pulse circuit (3) and clock circuit (4), described clock circuit (4) is connected with farad capacitor (5), described CPU (1), sample circuit is connected with power supply (6) with farad capacitor (5), and described farad capacitor (5) is the operation power supply of clock circuit under the power-off condition (3).
2. a kind of no battery intelligent ammeter according to claim 1, it is characterized in that: described sample circuit comprises current sampling circuit (21) and voltage sample circuit (22), described buffer amplifier circuit comprises current buffering amplifying circuit (23) and voltage buffer amplifier circuit (24), described current sampling circuit (21) connects A/D translation operation processor (2) through current buffering amplifying circuit (23), and described voltage sample circuit (22) connects A/D translation operation processor (2) through voltage buffer amplifier circuit (24).
3. a kind of no battery intelligent ammeter according to claim 1, it is characterized in that: described CPU (1) is connected with high capacity flash storer (7).
4. a kind of no battery intelligent ammeter according to claim 1 is characterized in that: the output terminal of described CPU (1) is connected with alarm (11), LCD display (12), send infrared device (13), infrared receiving device (14), keyboard (15) and RS-485 interface (16).
5. a kind of no battery intelligent ammeter according to claim 4 is characterized in that: described send infrared device (13) and infrared receiving device (14) communicate with handheld reading meter device (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920277926XU CN201548617U (en) | 2009-12-11 | 2009-12-11 | Battery-free intelligent ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920277926XU CN201548617U (en) | 2009-12-11 | 2009-12-11 | Battery-free intelligent ammeter |
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| Publication Number | Publication Date |
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| CN201548617U true CN201548617U (en) | 2010-08-11 |
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| CN200920277926XU Expired - Lifetime CN201548617U (en) | 2009-12-11 | 2009-12-11 | Battery-free intelligent ammeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592364A (en) * | 2011-12-29 | 2012-07-18 | 中国电力科学研究院 | Encryption and decryption functions based field service terminal and application method thereof |
| CN103729299A (en) * | 2012-10-12 | 2014-04-16 | 苏州工业园区新宏博通讯科技有限公司 | Data safety management method for event data storage of multi-path electricity meter |
-
2009
- 2009-12-11 CN CN200920277926XU patent/CN201548617U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592364A (en) * | 2011-12-29 | 2012-07-18 | 中国电力科学研究院 | Encryption and decryption functions based field service terminal and application method thereof |
| CN103729299A (en) * | 2012-10-12 | 2014-04-16 | 苏州工业园区新宏博通讯科技有限公司 | Data safety management method for event data storage of multi-path electricity meter |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140321 Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140321 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100192 HAIDIAN, BEIJING TO: 100031 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140321 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee before: China Electric Power Research Institute |
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| CX01 | Expiry of patent term |
Granted publication date: 20100811 |
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| CX01 | Expiry of patent term |