CN102591197A - Clock-temperature-error compensation method and system thereof - Google Patents

Clock-temperature-error compensation method and system thereof Download PDF

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Publication number
CN102591197A
CN102591197A CN2012100372217A CN201210037221A CN102591197A CN 102591197 A CN102591197 A CN 102591197A CN 2012100372217 A CN2012100372217 A CN 2012100372217A CN 201210037221 A CN201210037221 A CN 201210037221A CN 102591197 A CN102591197 A CN 102591197A
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temperature
clock
error
value
err
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张泽明
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Huizhou Desay SV Automotive Co Ltd
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Huizhou Desay SV Automotive Co Ltd
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Abstract

The invention relates to the field of related clock error compensation technology, and in particular relates to a clock-temperature-error compensation method and a system thereof. The clock-temperature-error compensation method comprises the following steps of: measuring the temperature at initial time, obtaining and storing a first temperature value, and storing the first temperature value; after measuring time T, measuring the temperature again and obtaining a second temperature value; adopting the first temperature value or the second temperature value as the measuring temperature, and according to the relation between the measuring temperature and the clock crystal-oscillator error, calculating and obtaining an error value of a clock; calculating a clock error of the measuring time T; repeatedly executing the steps from step 2 to step 4, till the clock error accumulated value is larger than a preset clock adjusting threshold, adding the value same as the clock adjusting threshold for the clock, and executing the steps from step 2 to step 4 again. The clock-temperature-error compensation method has the advantages that the clock compensation can be realized only by using the common circuit and algorithm without needing to use GPS or a function clock chip with expensive price and adjustable oscillating circuit frequency, so that the production cost is greatly reduced.

Description

A kind of clock method for compensating temperature errors and system thereof
Technical field
The present invention relates to clocking error compensation correlative technology field, particularly a kind of clock method for compensating temperature errors and system thereof.
Background technology
Crystal oscillator frequency receives extraneous thermal effect easily.General clock chip does not have temperature compensation function, so temperature variation can directly influence the accuracy of clock.Vehicle environment is more abominable, and the environment inside car temperature variation is big.Under this rugged environment, realize that high precision clock is a relatively thing of difficulty.In the car of height configuration,, generally adopt the synchronous mode of local clock and gps clock for solving the clock accuracy problem.But present most of car does not also have GP configuring S module, and clock cannot adopt GPS synchronous.Now have on the market to sell to have the clock chip of temperature compensation function, want much expensive but compare general clock chip price.Use this chip that cost of products is increased, reduced the power of striving unexpectedly of product.Adjust the frequency of clock oscillator according to ambient temperature, the error that temperature is caused has certain compensating action.Require clock chip to support that oscillator frequency is adjustable in this way but make.
Summary of the invention
The present invention provides a kind of clock crystal oscillator method for compensating temperature errors and system thereof, to solve the existing adjustable technical matters of frequency needs clock chip support oscillator frequency of adjusting clock oscillator according to ambient temperature.
The technical scheme that adopts is following:
A kind of clock method for compensating temperature errors comprises:
Step 1 is measured first temperature value and the preservation that temperature obtains at initial time;
Step 2 behind Measuring Time T, is measured temperature once more and is obtained second temperature value;
Step 3 serves as to measure temperature with first temperature value or second temperature value, and the relation according to measuring between temperature and the clock crystal oscillator error calculates in Measuring Time T the error amount err of clock per second;
Step 4, the clocking error err of calculating Measuring Time T TBe err T=err * T;
Step 5 makes first temperature value equal second temperature value, and repeated execution of steps 2 to 4 is up to clocking error accumulated value err TotalGreater than preset clock adjustment threshold value, then clock increases and the identical numerical value of clock adjustment threshold value, and the clocking error accumulated value reduces and the identical numerical value of clock adjustment threshold value, said clocking error accumulated value err simultaneously TotalThe clocking error of the Measuring Time T that obtains for execution in step 2 to 4 repeatedly add up with, execution in step 2 to 4 again.
Further, the concrete grammar of said step 3 is: tabling look-up obtains measuring the corresponding clock crystal oscillator error of temperature, is scaled the error amount err of clock per second then.
Further, said Measuring Time T is 5 minutes.
Further, said clock adjustment threshold value is 1 second.
Further, said clock is the system clock of onboard system.
A kind of clock temperature error compensation system comprises:
Temperature measuring equipment; Central controller and real-time timepiece chip; Central controller is connected with temperature measuring equipment, receives the measured measured temperature of temperature measuring equipment, and the external interrupt input port of central controller is connected with the interruption delivery outlet of real-time timepiece chip:
Central controller comprises:
The temperature initialization unit is used for receiving first temperature value that the measured temperature of temperature measuring equipment obtains and preserving at initial time;
Error calculation unit is used for receiving that real-time timepiece chip is every to be responded during at a distance from the look-at-me of sending behind the Measuring Time T, carries out following steps:
Measure temperature and obtain second temperature value, and;
With first temperature value or second temperature value serves as to measure temperature, and the relation according to measuring between temperature and the clock crystal oscillator error calculates in Measuring Time T, the error amount err of clock per second, and;
Calculate the clocking error err of Measuring Time T TBe err T=err * T wakes the clock compensation unit then up, and clocking error err TWithdraw from after sending to the clock compensation unit, wait for waking up of real-time timepiece chip;
The clock compensation unit is used to make first temperature value to equal second temperature value, to clocking error err TAdd up, obtain clocking error accumulated value err Total, and detect clocking error accumulated value err TotalIf, clocking error accumulated value err TotalGreater than preset clock adjustment threshold value, then controlling clock increases and the identical numerical value of clock adjustment threshold value, and the clocking error accumulated value reduces and the identical numerical value of clock adjustment threshold value simultaneously, withdraws from and wait for waking up of error calculation unit.
Further, said error calculation unit obtains measuring the corresponding clock crystal oscillator error of temperature through tabling look-up, and is scaled the error amount err of clock per second then.
Further, said Measuring Time T is 5 minutes, and said clock adjustment threshold value is 1 second.
Further, said temperature measuring equipment is a thermistor.
Further, it is characterized in that said clock is the system clock of onboard system.
The present invention has following advantage:
The present invention only need use common circuit and algorithm just can realize clock compensation, and need not to use GPS to compensate, and is therefore applied widely.The present invention simultaneously only needs on original clock circuit basis, to increase a thermistor.The thermistor price can be ignored to the influence of product price, and is cheap.Last the present invention only need use common clock chip to realize clock compensation, and need not to use the expensive functional clock chip with oscillatory circuit frequency adjustable.Therefore, greatly reduce production cost.
Description of drawings
Fig. 1 is the crystal oscillator temperature characteristics of the embodiment of the invention;
Fig. 2 is the system construction drawing of the embodiment of the invention;
Fig. 3 is the method flow diagram of the embodiment of the invention;
Fig. 4 is the temperature survey synoptic diagram of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed explanation.
Be illustrated in figure 2 as the system construction drawing of the embodiment of the invention.Present embodiment is an a kind of clock crystal oscillator temperature error compensation system, comprising:
Thermistor 1; Central controller 2 and real-time timepiece chip 3; The analog to digital conversion interface of central controller 2 is connected with thermistor 1; Receive the measured measured temperature of thermistor 1, the external interrupt input port of central controller 2 is connected with the interruption delivery outlet of real-time timepiece chip 3, and real-time timepiece chip 4 links to each other with clock crystal oscillator 5:
Central controller 2 comprises:
The temperature initialization unit is used for receiving first temperature value that the measured temperature of temperature measuring equipment obtains and preserving at initial time;
Error calculation unit is used for receiving that real-time timepiece chip 3 is every to be responded during at a distance from the look-at-me of sending after Measuring Time T=5 minute, carries out following steps:
Measure temperature and obtain second temperature value, and;
With first temperature value serves as to measure temperature, according to the relation of measuring between temperature and the clock crystal oscillator error, table look-up and calculate in Measuring Time T, and the error amount err of clock per second, and;
Calculate the clocking error err of Measuring Time T TBe err T=err * T wakes the clock compensation unit then up, and clocking error err TWithdraw from after sending to the clock compensation unit, wait for waking up of real-time timepiece chip;
The clock compensation unit is used to make first temperature value to equal second temperature value, to clocking error err TAdd up, obtain clocking error accumulated value err Total, and detect clocking error accumulated value err TotalIf, clocking error accumulated value err TotalClock adjustment threshold value greater than preset is 1 second, and then controlling clock increases and the identical numerical value of clock adjustment threshold value, and the clocking error accumulated value reduces 1 second simultaneously, withdraws from and wait for waking up of error calculation unit.
Concrete workflow is as shown in Figure 3:
Step 1, the temperature initialization unit is measured first temperature value and the preservation that temperature obtains at initial time;
Step 2 behind the real-time clock 3 process Measuring Time T (T=5 minute), is waken error calculation unit measurement temperature up and is obtained second temperature value;
Step 3, error calculation unit serve as to measure temperature with first temperature value, according to crystal oscillator temperature characteristics shown in Figure 1; Table look-up and obtain measuring the corresponding clock crystal oscillator error PPM of temperature; PPM converts to the clock crystal oscillator error, obtains in this Measuring Time T the error amount err of clock per second;
Step 4, the clocking error err of calculating Measuring Time T TBe err T=err * T;
Step 5, clock compensation unit make first temperature value equal second temperature value, and repeated execution of steps 2 to 4 is up to clocking error accumulated value err TotalGreater than 1 second, then controlling clock increased by 1 second, and the clocking error accumulated value reduces 1 second simultaneously, and execution in step 2 to 4 again.
The error that be divided into the frequency error of crystal oscillator cutting error and temperature cause, wherein to cause error be main error to temperature.
The error of crystal oscillator is expression with
Figure 901989DEST_PATH_IMAGE001
.
Figure 2012100372217100002DEST_PATH_IMAGE002
?(1)
Wherein is the actual frequency of crystal oscillator, and is the nominal frequency of crystal oscillator.
Figure 785817DEST_PATH_IMAGE001
can be expressed as second error?
Figure 118710DEST_PATH_IMAGE005
? (2)
For example:
Figure 2012100372217100002DEST_PATH_IMAGE006
of crystal oscillator, i.e. per second error
Figure 621498DEST_PATH_IMAGE007
Figure 443960DEST_PATH_IMAGE001
of correspondence under different temperatures is as shown in Figure 1 for the present embodiment crystal oscillator.
According to the crystal oscillator temperature characteristics, can obtain different temperature points to using value.Be made into form to different temperature points with corresponding .In program, can obtain each temperature spot corresponding
Figure 703406DEST_PATH_IMAGE001
through lookup table mode.
After central controller MCU got into sleep, it did not know when will compensate the time.So require RTC ability periodic wakeup MCU and tell it to compensate to the time.Common RTC has an INT delivery outlet.This delivery outlet can be configured to periodically export a pulse signal.The external interrupt input port that is input to this pulse signal MCU just can be waken MCU up.Circuit only need be connected to a thermistor AD mouth of MCU; MCU just can measure current temperature through the value of reading the AD mouth, thereby calculates corresponding
Figure 696770DEST_PATH_IMAGE001
.
If the time interval that MCU is waken up is too short, will certainly cause the quiescent current of total system to increase.If the time interval that MCU is waken up is long, during this period of time ambient temperature possibly change greatlyyer, can cause compensation effect undesirable.For the quiescent current that reduces MCU obtains compensation effect preferably simultaneously, it is 5 minutes that the cycle that MCU waken up is set.
In 5 minutes, variation of ambient temperature can be very not big, can be approximated to be constant temperature.So during this period of time the error of crystal oscillator also can be approximated to be constant.Since some time delay make RTC send wake-up signal carry out to MCU that the temperature benefit tastes during this period of time can be greater than 5 minutes.So, when beginning to compensate, must read the current time and go out the actual time interval with the Time Calculation of waking the back storage last time up.
As shown in Figure 4, a, b, c are that different MCU constantly are by wake-up point.At a constantly, MCU measurement Current Temperatures is t1.At b constantly, the temperature measured of MCU is t2 and to calculate a, the b time interval be T1.It is t1 that a, b can regard temperature as in the time interval always.The PPM that t1 is corresponding is PPM1.Can calculate the error e rr of per second with PPM1.Total error in a, the b time interval does
In the time interval, using the same method to calculate
Figure 388782DEST_PATH_IMAGE009
at c, b.The total error that adds up does
Figure 2012100372217100002DEST_PATH_IMAGE010
During as
Figure 811280DEST_PATH_IMAGE011
; Carry out time bias,
Figure 2012100372217100002DEST_PATH_IMAGE012
subtracts 1 second simultaneously.
Measure the experiment of clock accuracy:
Test condition:
Low temperature:
Figure 272348DEST_PATH_IMAGE013
℃, test duration: 24h.
Normal temperature:
Figure 2012100372217100002DEST_PATH_IMAGE014
℃, test duration: 24h.
High temperature:
Figure 889143DEST_PATH_IMAGE015
℃, test duration: 24h.
 
Experimental result after the temperature compensation useless is following:
Figure 2012100372217100002DEST_PATH_IMAGE016
Experimental result after the serviceability temperature compensation is following:
Figure 68452DEST_PATH_IMAGE017
In the combination instrument standard of domestic certain depot clock accuracy there is clear and definite requirement:
Under environment temperature ± 25 ℃, requiring clock accuracy is 24h ± 1S, in other operating temperature ranges except that ± 25 ℃,
Accuracy requirement is 24h ± 25S;
Use temperature compensation effect of the present invention fine from above data are visible, can satisfy in the combination instrument standard of motor corporation requirement clock accuracy.

Claims (10)

1. a clock method for compensating temperature errors is characterized in that, comprising:
Step 1 is measured first temperature value and the preservation that temperature obtains at initial time;
Step 2 behind Measuring Time T, is measured temperature once more and is obtained second temperature value;
Step 3 serves as to measure temperature with first temperature value or second temperature value, and the relation according to measuring between temperature and the clock crystal oscillator error calculates in Measuring Time T the error amount err of clock per second;
Step 4, the clocking error err of calculating Measuring Time T TBe err T=err * T;
Step 5 makes first temperature value equal second temperature value, and repeated execution of steps 2 to 4 is up to clocking error accumulated value err TotalGreater than preset clock adjustment threshold value, then clock increases and the identical numerical value of clock adjustment threshold value, and the clocking error accumulated value reduces and the identical numerical value of clock adjustment threshold value, said clocking error accumulated value err simultaneously TotalThe clocking error of the Measuring Time T that obtains for execution in step 2 to 4 repeatedly add up with, execution in step 2 to 4 again.
2. clock method for compensating temperature errors according to claim 1 is characterized in that, the concrete grammar of said step 3 is: tabling look-up obtains measuring the corresponding clock crystal oscillator error of temperature, is scaled the error amount err of clock per second then.
3. clock method for compensating temperature errors according to claim 1 is characterized in that, said Measuring Time T is 5 minutes.
4. clock method for compensating temperature errors according to claim 1 is characterized in that, said clock adjustment threshold value is 1 second.
5. according to each described clock method for compensating temperature errors of claim 1～4, it is characterized in that said clock is the system clock of onboard system.
6. a clock temperature error compensation system is characterized in that, comprising:
Temperature measuring equipment; Central controller and real-time timepiece chip; Central controller is connected with temperature measuring equipment, receives the measured measured temperature of temperature measuring equipment, and the external interrupt input port of central controller is connected with the interruption delivery outlet of real-time timepiece chip:
Central controller comprises:
The temperature initialization unit is used for receiving first temperature value that the measured temperature of temperature measuring equipment obtains and preserving at initial time;
Error calculation unit is used for receiving that real-time timepiece chip is every to be responded during at a distance from the look-at-me of sending behind the Measuring Time T, carries out following steps:
Measure temperature and obtain second temperature value, and;
With first temperature value or second temperature value serves as to measure temperature, and the relation according to measuring between temperature and the clock crystal oscillator error calculates in Measuring Time T, the error amount err of clock per second, and;
Calculate the clocking error err of Measuring Time T TBe err T=err * T wakes the clock compensation unit then up, and clocking error err TWithdraw from after sending to the clock compensation unit, wait for waking up of real-time timepiece chip;
The clock compensation unit is used to make first temperature value to equal second temperature value, to clocking error err TAdd up, obtain clocking error accumulated value err Total, and detect clocking error accumulated value err TotalIf, clocking error accumulated value err TotalGreater than preset clock adjustment threshold value, then controlling clock increases and the identical numerical value of clock adjustment threshold value, and the clocking error accumulated value reduces and the identical numerical value of clock adjustment threshold value simultaneously, withdraws from and wait for waking up of error calculation unit.
7. clock temperature error compensation according to claim 6 system is characterized in that, said error calculation unit obtains measuring the corresponding clock crystal oscillator error of temperature through tabling look-up, and is scaled the error amount err of clock per second then.
8. clock temperature error compensation according to claim 6 system is characterized in that said Measuring Time T is 5 minutes, and said clock adjustment threshold value is 1 second.
9. clock temperature error compensation according to claim 6 system is characterized in that said temperature measuring equipment is a thermistor.
10. according to each described clock temperature error compensation system of claim 6～9, it is characterized in that said clock is the system clock of onboard system.
CN2012100372217A 2012-02-20 2012-02-20 Clock-temperature-error compensation method and system thereof Pending CN102591197A (en)

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CN103092062A (en) * 2013-01-28 2013-05-08 成都天奥电子股份有限公司 Method and system used for real-time clock chip accuracy adjustment
CN103454904A (en) * 2013-09-04 2013-12-18 成都天奥电子股份有限公司 Quartz electronic watch and travel time method thereof
CN104035021A (en) * 2013-03-07 2014-09-10 上海宏测半导体科技有限公司 Testing method and system of clock chip
CN104536283A (en) * 2014-12-17 2015-04-22 深圳市航盛电子股份有限公司 Circuit and method for vehicle-mounted temperature compensation clock
CN104635193A (en) * 2013-11-06 2015-05-20 钜泉光电科技(上海)股份有限公司 SOC chip real-time clock high-precision compensation method for electric meters
CN105591632A (en) * 2014-10-22 2016-05-18 上海东软载波微电子有限公司 Real-time clock generation method and apparatus
CN108599758A (en) * 2018-02-10 2018-09-28 国网河南省电力公司郑州供电公司 The algorithm and device of high-precision trigger pulse are generated based on GPS
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US10623006B2 (en) 2017-06-28 2020-04-14 Analog Devices, Inc. Apparatus and methods for compensation of signal path delay variation
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US11038511B2 (en) 2017-06-28 2021-06-15 Analog Devices International Unlimited Company Apparatus and methods for system clock compensation
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CN102830611B (en) * 2012-09-05 2014-10-22 飞亚达（集团）股份有限公司 Time source
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CN104635193A (en) * 2013-11-06 2015-05-20 钜泉光电科技(上海)股份有限公司 SOC chip real-time clock high-precision compensation method for electric meters
CN105591632B (en) * 2014-10-22 2018-04-17 上海东软载波微电子有限公司 Real-time clock generation method and device
CN105591632A (en) * 2014-10-22 2016-05-18 上海东软载波微电子有限公司 Real-time clock generation method and apparatus
CN104536283A (en) * 2014-12-17 2015-04-22 深圳市航盛电子股份有限公司 Circuit and method for vehicle-mounted temperature compensation clock
CN108811050A (en) * 2017-04-28 2018-11-13 联芯科技有限公司 Wake-up synchronous method, device and the computer-readable medium of wireless terminal
US10848161B2 (en) 2017-06-28 2020-11-24 Analog Devices, Inc. Reference monitors with dynamically controlled latency
US11705914B2 (en) 2017-06-28 2023-07-18 Analog Devices, Inc. Phase detectors with alignment to phase information lost in decimation
US10749534B2 (en) 2017-06-28 2020-08-18 Analog Devices, Inc. Apparatus and methods for system clock compensation
US10749535B2 (en) 2017-06-28 2020-08-18 Analog Devices, Inc. Apparatus and methods for distributed timing using digital time stamps from a time-to-digital converter
US10623006B2 (en) 2017-06-28 2020-04-14 Analog Devices, Inc. Apparatus and methods for compensation of signal path delay variation
US11177816B2 (en) 2017-06-28 2021-11-16 Analog Devices, Inc. Fast locking sequence for phase-locked loops
US11038511B2 (en) 2017-06-28 2021-06-15 Analog Devices International Unlimited Company Apparatus and methods for system clock compensation
CN108599758A (en) * 2018-02-10 2018-09-28 国网河南省电力公司郑州供电公司 The algorithm and device of high-precision trigger pulse are generated based on GPS
CN108599758B (en) * 2018-02-10 2022-11-22 国网河南省电力公司郑州供电公司 Algorithm and device for generating high-precision trigger pulse based on GPS
CN111880641B (en) * 2020-07-29 2023-01-13 深圳星康医疗科技有限公司 Wearable device sampling precision calibration method
CN111880641A (en) * 2020-07-29 2020-11-03 深圳星康医疗科技有限公司 Wearable device sampling precision calibration scheme
US12043941B2 (en) 2020-10-26 2024-07-23 Haier Us Appliance Solutions, Inc. Washing machine appliance with sensorless speed detection and temperature compensation
CN117554661A (en) * 2024-01-12 2024-02-13 江苏优众微纳半导体科技有限公司 Radio frequency chip test error compensation method
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Application publication date: 20120718