CN201212907Y - RTC calibration apparatus for electric energy meter - Google Patents
RTC calibration apparatus for electric energy meter Download PDFInfo
- Publication number
- CN201212907Y CN201212907Y CNU200820053582XU CN200820053582U CN201212907Y CN 201212907 Y CN201212907 Y CN 201212907Y CN U200820053582X U CNU200820053582X U CN U200820053582XU CN 200820053582 U CN200820053582 U CN 200820053582U CN 201212907 Y CN201212907 Y CN 201212907Y
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- CN
- China
- Prior art keywords
- electric energy
- energy meter
- rtc
- communication interface
- clock
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses an RTC timing device of an electric energy meter, which comprises a clock tester, an arithmetic unit and a communication interface that are connected in sequence, wherein the clock tester measures an RTC output signal by adopting a radio induction way, the communication interface is connected with the communication interface of the electric energy meter, and the inherent error of the clock element of the electric energy meter can be stored in the memorizer of the electric energy meter by the arithmetic unit and the communication interface. The utility model can measure the inherent error of the RTC in the electric energy meter, and transmit the inherent error into the electric energy meter for storage, so as to cause that the electric energy meter can automatically and simultaneously compensate and regulate the inherent error and the temperature drift departure of the RTC when in use, thereby better solving the problem of the timing accuracy of the RTC in the electric energy meter.
Description
Technical field
The utility model relates to a kind of RTC calibration apparatus of electric energy meter
Background technology
Existing electronic electric energy meter generally all comprises RTC, temperature measuring device, MCU, nonvolatile memory and communication interface, and wherein the RTC clock accuracy plays crucial effects to aspects such as electric energy meter chargings.Because the existence of the clock element inherent error of RTC in the electric energy meter at present, the output of RTC device will offset when this error constantly accumulates.Clock element with 32.768kHz commonly used at present is an example, and the error about 20ppm takes place in one-period approximately, varies with temperature simultaneously also and can change.The accuracy of timekeeping of RTC is relatively poor in the therefore present electric energy meter.
The utility model content
The purpose of this utility model is to provide a kind of inherent error of the clock element that can measure RTC in the electric energy meter and improves the RTC calibration apparatus and the RTC automatic compensation correcting method of the electric energy meter of RTC accuracy of timekeeping.
The RTC calibration apparatus of this electric energy meter that the utility model provides, comprise clock test instrument, arithmetical unit, communication interface, be linked in sequence between them, wherein the clock test instrument adopts the mode formula measure R TC output signal of wireless induction, communication interface is connected with the communication interface of electric energy meter, stores in the storer of electric energy meter by described arithmetical unit and the described communication interface clock element inherent error with electric energy meter.
The utility model electric energy meter RTC calibration apparatus can be measured the inherent error of RTC in the electric energy meter, and this error transferred in the electric energy meter store, this work can be finished by manufacturer before electric energy meter dispatches from the factory, and makes electric energy meter can be in use can be automatically compensate correction simultaneously to inherent error and the temperature drift deviation of RTC.Well solved the accuracy of timekeeping problem of RTC device in the electric energy meter.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
The RTC calibration apparatus of the utility model electric energy meter as can be seen from Figure 1, comprise clock test instrument 1, arithmetical unit 2, communication interface 3, in the present embodiment clock test instrument 1 adopt Guangzhou can be auspicious the RT-3000 type clock test instrument produced of electronics technology company limited, communication interface 3 adopts RS485 serial line interface or contact infrared optical interface or modulation system infrared optical interface.The output signal end of tester 1 is connected with arithmetical unit by the RS232 interface, when electric energy meter is carried out adjustment, electric energy meter 4 should be put into the induction region of tester 2, communication interface 3 is connected with the communication interface 7 of electric energy meter, the clock test instrument mode formula measure R TC6 output signal of wireless induction, measure the inherent error of the clock element of RTC, arithmetical unit 2 converts after the data of tester 1 are taken out by the tester output interface, error information is passed to MCU8 in the electric energy meter, and be written in the nonvolatile memory 9 in the electric energy meter and store.
The utility model at first will be positioned over electric energy meter 4 the demarcation temperature when using (this temperature is by the manufacture method decision of clock element, be generally 25 ± 5 ℃) in the environment, when treating its clock element energy steady operation, communication interface 3 with the RTC calibration apparatus of described electric energy meter is communicated with the communication interface 7 of electric energy meter, and make electric energy meter 4 be in the induction zone of the clock test instrument 1 of described electric energy meter calibration apparatus, measure the inherent error of RTC6 in the electric energy meter; And this error is stored in the nonvolatile memory 9 of electric energy meter; The temperature data of being measured by temperature measuring equipment 5 in the electric energy meter 4 reads among the RAM of electric energy meter MCU8, and temperature data is converted to the temperature drift error by the characteristic curve of clock element; The MCU8 of electric energy meter takes out the inherent error data in the nonvolatile memory 9, and the addition of temperature drift sum of errors inherent error data is obtained immediate error; Multiply by immediate error with twice compensation mistiming constantly and draw the absolute error that the clock element produces between twice compensation constantly; This absolute error is added up, when reaching RTC6 least unit in the electric energy meter (being generally 1 second), then revise cumulative data and upgrade RTC6 simultaneously, otherwise preserve accumulated value, finish this time compensating flow process as if cumulative data.So make the automatic rectification building-out of RTC energy in the electric energy meter.
Claims (1)
1, a kind of RTC calibration apparatus of electric energy meter, it is characterized in that this device comprises clock test instrument (1), arithmetical unit (2), communication interface (3), be linked in sequence between them, wherein clock test instrument (1) adopts the mode formula of wireless induction to measure the output signal of RTC (6) in the electric energy meter, measure the inherent error of the clock element of RTC (6), communication interface (3) is connected with the communication interface (7) of electric energy meter, stores in the nonvolatile memory (9) of electric energy meter by described arithmetical unit (2) and communication interface (3) the clock element inherent error with RTC (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820053582XU CN201212907Y (en) | 2008-07-01 | 2008-07-01 | RTC calibration apparatus for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820053582XU CN201212907Y (en) | 2008-07-01 | 2008-07-01 | RTC calibration apparatus for electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201212907Y true CN201212907Y (en) | 2009-03-25 |
Family
ID=40497083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820053582XU Expired - Lifetime CN201212907Y (en) | 2008-07-01 | 2008-07-01 | RTC calibration apparatus for electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201212907Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116385A (en) * | 2013-03-01 | 2013-05-22 | 华为技术有限公司 | Correcting circuit and real-time clock circuit |
| CN103499803A (en) * | 2013-09-09 | 2014-01-08 | 扬州市万泰电器厂有限公司 | Method for improving precision of built-in real-time clock of electric energy meter MCU |
| CN108020808A (en) * | 2017-11-21 | 2018-05-11 | 浙江晨泰科技股份有限公司 | A kind of highly reliable high-precision electric energy meter real-time clock design method |
-
2008
- 2008-07-01 CN CNU200820053582XU patent/CN201212907Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116385A (en) * | 2013-03-01 | 2013-05-22 | 华为技术有限公司 | Correcting circuit and real-time clock circuit |
| CN103116385B (en) * | 2013-03-01 | 2015-11-25 | 华为技术有限公司 | Correcting circuit and real time clock circuit |
| US9362920B2 (en) | 2013-03-01 | 2016-06-07 | Huawei Technologies Co., Ltd. | Correction circuit and real-time clock circuit |
| CN103499803A (en) * | 2013-09-09 | 2014-01-08 | 扬州市万泰电器厂有限公司 | Method for improving precision of built-in real-time clock of electric energy meter MCU |
| CN103499803B (en) * | 2013-09-09 | 2015-09-09 | 扬州万泰电子科技有限公司 | A kind of method improving precision of built-in real-time clock of electric energy meter MCU |
| CN108020808A (en) * | 2017-11-21 | 2018-05-11 | 浙江晨泰科技股份有限公司 | A kind of highly reliable high-precision electric energy meter real-time clock design method |
| CN108020808B (en) * | 2017-11-21 | 2020-02-04 | 浙江晨泰科技股份有限公司 | High-reliability high-precision electric energy meter real-time clock design method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WEISHENG GROUP CO.,LTD. Free format text: FORMER NAME: CHANGSHA WEISHENG ELECTRONICS CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: No. 359, South Bank Road, Changsha hi tech Industrial Development Zone, Hunan, China: 410013 Patentee after: Wasion Group Co., Ltd. Address before: No. 359, South Bank Road, Changsha hi tech Industrial Development Zone, Hunan, China: 410013 Patentee before: Changsha Weisheng Electronics Co., Ltd. |
|
| C56 | Change in the name or address of the patentee |
Owner name: WEISHENG GROUP CO.,LTD. Free format text: NEW ADDRESS: NO.468, TONGZIPO XI ROAD, CHANGSHA COUNTY HIGH-TECH INDUSTRIES DEVELOPMENT AREA, HUNANPROVINCE, ZIP CODE:410013 |
|
| CP02 | Change in the address of a patent holder |
Address after: No. 468 west slope, Changsha hi tech Industrial Development Zone, Hunan, Tongzi 410013, China Patentee after: Wasion Group Co., Ltd. Address before: No. 359, South Bank Road, Changsha hi tech Industrial Development Zone, Hunan, China: 410013 Patentee before: Wasion Group Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20090325 Effective date of abandoning: 20080701 |