CN105573106B - To the amendment circuit and its method of RTC accuracy of timekeeping in a kind of intelligent electric meter - Google Patents
To the amendment circuit and its method of RTC accuracy of timekeeping in a kind of intelligent electric meter Download PDFInfo
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- CN105573106B CN105573106B CN201410523580.2A CN201410523580A CN105573106B CN 105573106 B CN105573106 B CN 105573106B CN 201410523580 A CN201410523580 A CN 201410523580A CN 105573106 B CN105573106 B CN 105573106B
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Abstract
The present invention relates to intelligent electric meter fields, to the amendment circuit and its method of RTC accuracy of timekeeping in specifically a kind of intelligent electric meter, the circuit includes that 12 bit A/D C temperature detecting modules, trueness error computing module, compensation value calculation module and pulse per second (PPS) generation module, this method include：Crystal oscillator screens；Curve matching；Calculate Crystal Oscillator Errors；Offset value calculation；The impulse compensation period is found out according to offset；Define cumulative errors；According to cumulative errors and the corresponding pulse number of compensation cycle, counter is adjusted；Crystal Oscillator Errors are positive number, and clock frequency is fast, and counter just stops a bat without counting, and Crystal Oscillator Errors are negative, and clock frequency is slow, and counter just adds 2 countings.The modification method of the present invention can obtain an accurately pulse per second (PPS), without a large amount of storage data, save memory, reduce power consumption, improve timing accuracy, reduce influence of the temperature to timing accuracy.
Description
Technical field
The present invention relates to intelligent electric meter technical field, to the amendment of RTC accuracy of timekeeping electricity in specifically a kind of intelligent electric meter
Road and its method.
Background technology
Well known, intelligent electric meter is the intelligent terminal of intelligent grid, it has not been traditional electric energy meter, intelligence
Ammeter is other than having the function of measuring of traditional electric energy meter basic electricity, in order to adapt to making for intelligent grid and new energy
With, it also with two-way a variety of rate function of measuring, user terminal control function, plurality of data transmission modes bidirectional data communication
The intelligentized function such as function, anti-stealing electricity function, it is intelligent that intelligent electric meter represents the following energy-conserving intelligent power grid end user
The developing direction of terminal.Intelligent electric energy meter is a kind of electric energy meter, relatively previous common electric energy meter, except having basic meter
It measures outside function, intelligent electric energy meter is electronic power meter, carries hardware clock and complete communication interface, is had highly reliable
The features such as property, high safety grade and large storage capacity, comply fully with the requirement of Chinese future development " energy conservation and environmental protection ".
Currently, intelligent electric meter is worked based on SOC chip, existing intelligent electric meter is typically necessary satisfaction in wide Wen Fan
Enclose the interior requirement for carrying out accurate timing.And the accurate timing of intelligent electric meter depends on following important parameter：First, initial
Precision, refer to device under normal conditions, initially use precision；Second is that long-time stability, are for predicting entirely effectively to make
With the stability in the time limit；Third, temperature coefficient, is error caused by estimated temperature variation.Wherein, initial precision is mainly by crystalline substance
The influence for quality of shaking, precision more high price is also more expensive, and usually both economical method is according to specific design to the first of crystal oscillator
Beginning frequency is simply compensated.Long-time stability are mainly influenced by crystal oscillator aging, and the period being affected is usually equipment
Postrun the first two years, so, it is soluble over time for this factor.But for temperature coefficient
This factor provides specific, targetedly solution there are no corresponding in the prior art.It is well known, intelligent electric meter
Interior clock chip normal working temperature is 25 degrees centigrades, due to the temperature change of different time and season so that chip
There are certain error, most effective method be the time is compensated, and the time compensation its be in the nature crystal oscillator frequency compensation.
In order to eliminate influence of the different parameters to timing accuracy, existing one entitled " to the inside SOC in intelligent electric meter
The modification method of RTC accuracy of timekeeping ", application No. is the patents of " 201010276976.3 " to disclose a kind of amendment scheme, tool
Body is to use periodic timing precision revised law.Its technical solution：The pps pulse per second signal that RTC chip is sent out is used
The external crystal-controlled oscillation of 32768HZ is counted.It stores pulse per second (PPS) counting number error per minute to be averaged, obtains OSC_
Freq_A, second arteries and veins hourly count number error and are averaged, and obtain OSC_freq_B.By OSC_freq_A and OSC_
Two parameters of freq_B are sent into RTC chip, to correct the pulse per second (PPS) that RTC chip is sent out.Be exactly in fact in order to obtain one
Even pulse per second (PPS), this method needs a large amount of caching, and occupies MCU, and of high cost, compensation efficiency is low.
Invention content
The purpose of the present invention is be directed to the defects of background technology, it is proposed that RTC accuracy of timekeeping in a kind of intelligent electric meter
Amendment circuit and its method, the modification method need not occupy a large amount of spatial cache, can reduce power consumption, it is accurate to improve timing
True property, it is pure hardware configuration to correct circuit, and the course of work is not necessarily to the participation of software, at low cost.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：To RTC timing in a kind of intelligent electric meter
The amendment circuit of precision, it is characterized in that：The amendment circuit include 12 bit A/D C temperature detecting modules, trueness error computing module,
Compensation value calculation module and pulse per second (PPS) generation module；Wherein, the 12 bit A/D C temperature detecting modules detect current temperature
Value；The trueness error computing module passes through formula according to the parameter value of crystal oscillator in current temperature value and RTCCalculate Crystal Oscillator Errors value；The compensation value calculation module is missed according to crystal oscillator
Mathematic interpolation goes out offset；The pulse per second (PPS) generation module show that pulse per second (PPS) compensation and compensates number according to offset,
Export revised pulse per second (PPS).Preferably：The 12 bit A/D C temperature detecting modules include at least temperature sensor, by temperature
Degree sensor detects current temperature.
Preferably：The trueness error computing module includes at least multiplications/additions device and arithmetic and control unit, by operation control
Device processed and multiplications/additions device realize formulaOperation.
Preferably：The compensation value calculation module includes at least multiplier, shift register and arithmetic and control unit.
Preferably：The pulse per second (PPS) generation module includes at least adder, counter and arithmetic and control unit.
Based on the amendment circuit, the present invention also provides in a kind of intelligent electric meter to the amendment side of RTC accuracy of timekeeping
Method, this approach includes the following steps：
（1）Crystal oscillator in RTC is screened in batches, will specifically be open consistent, quadratic coefficientsControl errors exist
±Crystal oscillator screen in batches；
（2）It carries out curve fitting to the crystal oscillator screen in batches after, indicates that temperature, the longitudinal axis indicate Crystal Oscillator Errors according to horizontal axis
Curved line relation is fitted, and Crystal Oscillator Errors formula is generated by fittingIn ginseng
Number、、T0Value, and will、、T0Value programming to trueness error counting circuit in；
（3）At normal temperatures, offest values are set as 0, repeatedly measure the pulse per second (PPS) error after correction and be averaged, obtained
To step（2）Offest values in formula；
（4）By temperature sensor obtain Current Temperatures, by Current Temperatures,、、T0, offest values substitute into crystal oscillator miss
Poor formulaIn, calculate Crystal Oscillator Errors y, i.e. Crystal Oscillator Errors CrystalError
Value；
（5）Crystal Oscillator Errors CrystalError values are substituted into offset formulaIn, the f in the formula0Frequency is shaken for standard,
Value is 32768Hz, and to go out the pulse number of compensation each second by compensation value calculation circuit counting, i.e. pulse per second (PPS) compensates number；
（6）DefinitionSecond be impulse compensation period and by its programming to pulse per second (PPS) counting circuit, wherein n be more than or equal to
5 positive integer；
（7）Finally definition is everyThe cumulative errors of second are final_comp_value, often count down to 215-nWhen（N be more than
Positive integer equal to 5）, by the fractional part of the value of final_comp_value withSecond, corresponding impulse compensation number was added,
If the integer part of final_comp_value is more than or equal to 1, clock counter just stops a bat and is not added with or adds 2, so
The integer part of final_comp_value is reset afterwards, the fractional part of final_comp_value is continued to retain, is left for
It is cumulative followed by error.
Preferably：The step（2）In curve matching be fitted using Matlab functional softwares.
It is another preferred：The step（4）In Crystal Oscillator Errors CrystalError be positive value, step（6）In clock
Counter just stops a bat；Crystal Oscillator Errors CrystalError is negative value, step（6）In clock counter just add 2.
The beneficial effects of the invention are as follows：The realization of the amendment circuit of the present invention is the structure of devices at full hardware, in the course of work
The participation of software is not needed, it is low in energy consumption, it is at low cost.
In addition, its modification method is under conditions of it is 32768Hz to input crystal oscillator frequency, high-precision timing circuit is realized
, after the completion of initial configuration, the hardware in circuit can be calibrated automatically according to the completion pulse per second (PPS) of the variation timing of temperature, be protected
It has demonstrate,proved the clock in intelligent electric meter and has obtained accurately timing circuit.
The method of the present invention can control trueness error per second in 1/32768, that is, 30.517578125ppm,
If further using rounding-off method, error precision reduces half, that is, 15.2587890625ppm again, if do not considered
The error introduced in curve fit error and temperature handoff procedure, and assume that final_comp_value can be in actual operation
Retaining infinite bit length after decimal point, after long term accumulator, accumulative trueness error per minute is less than or equal to 15.2587890625ppm,
Accumulative trueness error hourly is less than or equal to 15.2587890625ppm, and daily accumulative trueness error is less than or equal to
15.2587890625ppm the error is less than timing error 0.02s/ days of grid requirements.In addition, during this method is realized
The participation for not needing software, saves memory, reduces power consumption, improves timing accuracy, reduces temperature to accurate timing
The influence of property.
Description of the drawings
Fig. 1, the present invention correct the structure diagram of circuit；
Fig. 2, the schematic diagram of matched curve in specific implementation mode；
Fig. 3, the block diagram of pulse per second (PPS) generation module in specific implementation mode.
Specific implementation mode
Specific embodiments of the present invention will be described in further detail for scheme below in conjunction with the accompanying drawings and preferably.
As shown in Figure 1, being the structure diagram of the amendment circuit of the present invention, to RTC timing in specifically a kind of intelligent electric meter
The amendment circuit of precision, the circuit include at least 12 bit A/D C temperature detecting modules, trueness error computing module, offset meter
Calculate module and pulse per second (PPS) generation module.Wherein, the 12 bit A/D C temperature detecting modules include at least temperature sensor, by
Temperature sensor detects current temperature.The trueness error computing module is the Current Temperatures according to programming in its module
Value, crystal oscillator parameter、、T0, offest values, by module multiplications/additions device and arithmetic and control unit according to formulaTo calculate Crystal Oscillator Errors value step by step.The compensation value calculation module is
Offset is approximatively calculated by multiplier, shift register and arithmetic and control unit according to Crystal Oscillator Errors value.The second arteries and veins
It is to show that pulse per second (PPS) compensates number according to offset to rush generation module, by compensating corresponding pulse per second (PPS) number, according to adder,
The work of counter and arithmetic and control unit is to export revised pulse per second (PPS).
Embodiment one：Curve matching in the present embodiment uses cubic curve, and the horizontal axis expression of the curve is temperature, is indulged
What axis indicated is crystal oscillator frequency.The course of work that pulse per second (PPS) is generated in the present embodiment, is completed according to attached block diagram shown in Fig. 3
's.
Method and step：（1）It is to be screened crystal oscillator in batches first, specifically by opening upwards, quadratic coefficients's
Control errors ±Crystal oscillator screen in batches；（2）Then the crystal oscillator screen in batches after is carried out three
Secondary curve matching specifically can be used Matlab functional softwares to operate, be obtained according to the function of software after fitting、、T0
Value, and will be in the value programming to Crystal Oscillator Errors counting circuit；（3）Then crystal oscillator offest values are measured again, and the value programming is arrived
In Crystal Oscillator Errors counting circuit, the measuring process of the value is that offest values are first set as 0, at normal temperatures, after measuring correction
Pulse per second (PPS) error is repeatedly measured and is averaged, and the average value surveyed is exactly offest values；（4）Pass through 12 bit A/D C temperature again
Spend detection module temperature sensor obtain Current Temperatures, by trueness error computing module arithmetic and control unit and multiply
Method/adder according to the Current Temperatures of programming,、、T0, offest value substitute into Crystal Oscillator Errors formulaIn, calculate Crystal Oscillator Errors y, the i.e. value of CrystalError；（5）By crystal oscillator
Error CrystalError values substitute into offset formula
In, the f in the formula0Frequency is shaken for standard, value is 32768Hz, to calculate by compensation value calculation circuit meter
The pulse number of compensation each second is calculated, i.e. pulse per second (PPS) compensation number goes out offset, i.e. arteries and veins by compensation value calculation circuit counting
Punching compensates number, the f in the formula0Frequency is shaken for standard, value is 32768Hz；Due toEmbodiment in computing module is division fortune to be carried out
It calculates, being realized in ASIC hardware can be more complicated, and expends resource, so the compensation value calculation module of the present invention is basis
FormulaApproximate calculation goes out offset, is calculated particular by the multiplier in compensation value calculation module
Crystal Oscillator Errors CrystalError is multiplied by 137439, then moves 22 again by the shift register in module and can be obtained by compensation
Value, since the mistake absolute value of the difference of general crystal oscillator does not exceed 500ppm, so being missed 500ppm as crystal oscillator in the present embodiment
Difference is brought into offset formula, obtains comp_value=16.384 pulse, so the pulse number of compensation each second will not
More than 17.If it is desired to which the time whenever measured is all accurate, then every 1/2 second impulse compensation number does not exceed 9
It is a；Every 1/4 second impulse compensation number does not exceed 5；Every 1/8 second impulse compensation number does not exceed 3；Every 1/16 second
Impulse compensation number do not exceed 2；Every 1/32 second impulse compensation number is less than 1, wherein 1/32=1/25；If brilliant
The mistake absolute value of the difference shaken is more than 500ppm, can similarly be derived with above method, if necessary to precision higher, interval compensation
Time can continue to reduce, meanwhile, power consumption also will increase, and the equalization point selected of more low-power consumption and higher precision is compensation
Number is proper less than 1 period；（6）1/32 second is defined for the impulse compensation period and by its programming to pulse per second (PPS) counting circuit
In；（7）It is final_comp_value finally to define every 1/32 second cumulative errors, when often counting down to 1024, by final_
The fractional part of the value of comp_value impulse compensation number corresponding with 1/32 second is added, if final_comp_value
Integer part is more than or equal to 1, is not added with then clock counter just stops a bat or adds 2, then by final_comp_value's
Integer part is reset, and the fractional part of final_comp_value is continued to retain, and leaves, the step cumulative followed by error for
Realization block diagram as shown in Fig. 3, the revised pulse per second (PPS) of final output.
Step in the present embodiment（1）With（2）It is no in the course of work of the amendment circuit of the present invention, because one
As crystal oscillator the screening of manufacturer is had already been through when producer buys, parameter value therein also passes through manufacturer
It measures, generates in the specifications of crystal oscillator, so, when using the amendment circuit of the present invention, it is only necessary to by these known ginsengs
Number programmings are into circuit.Due to having been disclosed for step in the method for the present invention（1）And step（2）Content, so
Even if not having the embodiment of the two steps in the course of work of this circuit, the realization of this circuit will not be influenced.
Embodiment two：Curve matching in the present embodiment uses conic section, and the curve after fitting is as shown in Fig. 2,
What the horizontal axis of the curve indicated is temperature, and what the longitudinal axis indicated is crystal oscillator frequency.The course of work of pulse per second (PPS) is generated in the present embodiment,
It is completed according to attached block diagram shown in Fig. 3.Since the present embodiment is using the fitting of conic section, using Matlab letters
Software is counted to operate, can only be obtained according to the function of software after fitting、T0Value, at this time only need to be by Crystal Oscillator Errors formulaInValue, which substitutes into " 0 " value, can obtain Crystal Oscillator Errors value.In the present embodiment
The step of remove step（2）It is essentially identical with the step in embodiment one outside, identical content which is not described herein again.
Although the precision higher of cubic curve, the precision of conic fitting have been able to the timing for reaching national grid
Error requirements, so in intelligent electric meter, it is contemplated that the problems such as power consumption, cost, the fitting of conic section may be used to reduce
Cost.
Modification method disclosed by the invention be trueness error per second is controlled 1/32768, that is,
30.517578125ppm, if further using rounding-off method, error precision reduces half again, that is,
15.2587890625ppm, the error introduced in not considering curve fit error and temperature handoff procedure, and assume final_
Comp_value can retain infinite bit length after decimal point in actual operation, and after long term accumulator, accumulative precision per minute is missed
Difference is less than or equal to 15.2587890625ppm, and accumulative trueness error hourly is less than or equal to 15.2587890625ppm, daily
Accumulative trueness error be less than or equal to 15.2587890625ppm, annual accumulative trueness error is less than or equal to
15.2587890625ppm.Since the timing error of grid requirements is less than 0.02s/ days, meet power grid with the inventive method
Requirement.
Claims (10)
1. to the amendment circuit of RTC accuracy of timekeeping in a kind of intelligent electric meter, it is characterized in that：The amendment circuit includes 12 bits
ADC temperature detecting modules, trueness error computing module, compensation value calculation module and pulse per second (PPS) generation module；
Wherein, the 12 bit A/D C temperature detecting modules detect current temperature value；
The trueness error computing module passes through Crystal Oscillator Errors public affairs according to the parameter value of crystal oscillator in current temperature value and RTC
FormulaCalculate Crystal Oscillator Errors CrystalError values, wherein y is that crystal oscillator misses
Difference,It is three ordered coefficients,It is quadratic coefficients, offset is the vertical misalignment amount of cubic curve, and x is current temperature value, T0
It is quadratic term vertex temperature；
The compensation value calculation module substitutes into formula according to Crystal Oscillator Errors CrystalError valuesCalculate offset, f in formula0Frequency is shaken for standard
Rate, value are 32768Hz；
The pulse per second (PPS) generation module is defined according to offsetSecond is the impulse compensation period, and definition is everyThe accumulative mistake of second
Difference is final_comp_value, often count down to 215-nWhen, n is the positive integer more than or equal to 5, by final_comp_value
Value fractional part withSecond, corresponding impulse compensation number was added, if the integer part of final_comp_value is big
In equal to 1, it is not added with then counting and just stopping a bat or adds 2, then reset the integer part of final_comp_value, it will
The fractional part of final_comp_value continues to retain, and leaves for cumulative to obtain pulse per second (PPS) compensation followed by error
Number, and compensate the revised pulse per second (PPS) of output.
2. according in the intelligent electric meter described in claim 1 to the amendment circuit of RTC accuracy of timekeeping, it is characterized in that：Described
12 bit A/D C temperature detecting modules include at least temperature sensor.
3. according in the intelligent electric meter described in claim 1 to the amendment circuit of RTC accuracy of timekeeping, it is characterized in that：Described
Trueness error computing module includes at least multiplications/additions device and arithmetic and control unit.
4. according in the intelligent electric meter described in claim 1 to the amendment circuit of RTC accuracy of timekeeping, it is characterized in that：Described
Compensation value calculation module includes at least multiplier, shift register and arithmetic and control unit.
5. according in the intelligent electric meter described in claim 1 to the amendment circuit of RTC accuracy of timekeeping, it is characterized in that：Described
Pulse per second (PPS) generation module includes at least adder, counter and arithmetic and control unit.
6. to the modification method of RTC accuracy of timekeeping in a kind of intelligent electric meter, the realization of this method is based in the intelligent electric meter
To the amendment circuit of RTC accuracy of timekeeping, which is characterized in that this approach includes the following steps：
（1）Crystal oscillator in RTC is screened in batches, will specifically be open consistent, quadratic coefficientsControl errors ±Crystal oscillator screen in batches；
（2）It carries out curve fitting to the crystal oscillator screen in batches after, indicates that temperature, the longitudinal axis indicate the curve of Crystal Oscillator Errors according to horizontal axis
Relationship is fitted, and Crystal Oscillator Errors formula is generated by fittingIn parameter、、T0 Value, and will、、T0Value programming to trueness error counting circuit in；
（3）At normal temperatures, offest values are set as 0, repeatedly measure the pulse per second (PPS) error after correction and be averaged, walked
Suddenly（2）Offest values in Crystal Oscillator Errors formula；
（4）By temperature sensor obtain Current Temperatures, by Current Temperatures,、、T0, that offest values substitute into Crystal Oscillator Errors is public
FormulaIn, calculate Crystal Oscillator Errors y, i.e. Crystal Oscillator Errors CrystalError values；
（5）Crystal Oscillator Errors CrystalError values are substituted into offset formula
In, the f in the formula0Frequency is shaken for standard,
Its value is 32768Hz, to calculate the pulse number of compensation each second, i.e. pulse per second (PPS) compensation by compensation value calculation module
Number；
（6）DefinitionSecond, wherein n was more than or equal to 5 for the impulse compensation period and by its programming to pulse per second (PPS) generation module
Positive integer；
（7）Finally definition is everyThe cumulative errors of second are final_comp_value, often count down to 215-nWhen, n be more than or equal to
5 positive integer, by the fractional part of the value of final_comp_value withSecond, corresponding impulse compensation number was added, if
The integer part of final_comp_value is more than or equal to 1, is not added with then clock counter just stops a bat or adds 2, then will
The integer part of final_comp_value is reset, and the fractional part of final_comp_value is continued to retain, and is left for below
It is cumulative to carry out error；
Wherein, y is Crystal Oscillator Errors value,It is three ordered coefficients,It is quadratic coefficients, offset is the vertical misalignment of cubic curve
Amount, x is current temperature value, T0It is quadratic term vertex temperature.
7. according in the intelligent electric meter described in claim 6 to the modification method of RTC accuracy of timekeeping, it is characterized in that：The step
Suddenly（2）In curve matching be fitted using Matlab functional softwares.
8. according in the intelligent electric meter described in claim 6 to the modification method of RTC accuracy of timekeeping, it is characterized in that：The step
Suddenly（4）In Crystal Oscillator Errors CrystalError values be positive value, step（6）In clock counter just stop a bat；Crystal Oscillator Errors
CrystalError values are negative value, step（6）In clock counter just add 2.
9. according in the intelligent electric meter described in claim 6 to the modification method of RTC accuracy of timekeeping, it is characterized in that：Institute
The step of stating（5）In offset formulaWith formulaApproximate calculation.
10. according in the intelligent electric meter described in claim 6 to the modification method of RTC accuracy of timekeeping, it is characterized in that：The step
Suddenly（2）In curve matching be conic section fitting either cubic curve fitting.
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| CN105978555A (en) * | 2016-07-01 | 2016-09-28 | 无锡华润矽科微电子有限公司 | Real-time clock timing precision correction circuit and method with temperature compensation function |
| CN110308644B (en) * | 2019-08-02 | 2021-04-02 | 南方电网科学研究院有限责任公司 | Smart electric meter clock timing precision compensation method, device and equipment |
| CN111638750A (en) * | 2020-06-01 | 2020-09-08 | 杭州万高科技股份有限公司 | Writer and RTC correcting method |
| CN111562543B (en) * | 2020-06-01 | 2022-10-18 | 杭州万高科技股份有限公司 | Electric energy meter pulse per second error tester and electric energy meter pulse per second error testing method |
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| CN113525142B (en) * | 2020-10-29 | 2022-06-03 | 长城汽车股份有限公司 | Method and device for reserving charging timing and terminal equipment |
| CN112731790B (en) * | 2020-12-07 | 2021-12-03 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
| CN114200815B (en) * | 2021-11-15 | 2023-03-24 | 秦佳电气有限公司 | Method and system for improving timing precision of common timer |
| CN114609440B (en) * | 2022-05-11 | 2022-08-05 | 北京神州安付科技股份有限公司 | Non-contact RTC crystal oscillator detection device |
| CN115932711B (en) * | 2023-03-10 | 2023-07-07 | 杭州炬华科技股份有限公司 | Data processing method, device and medium for metering reliability of electric energy meter |
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