CN104965186A - Calibration method for automatically compensating electric energy metering error of electric energy meter according to temperature - Google Patents
Calibration method for automatically compensating electric energy metering error of electric energy meter according to temperature Download PDFInfo
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- CN104965186A CN104965186A CN201510263178.XA CN201510263178A CN104965186A CN 104965186 A CN104965186 A CN 104965186A CN 201510263178 A CN201510263178 A CN 201510263178A CN 104965186 A CN104965186 A CN 104965186A
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Abstract
The invention discloses a calibration method for automatically compensating an electric energy metering error of an electric energy meter according to temperature. The calibration method may timely compute a new power gain correcting register calibration value according to environment temperature and replaces an original power gain correcting register calibration value in a power gain correcting register so as to enable a low difference between the actual electric energy consumption of a user and the electric energy metering of the electric energy meter. A calibration device and a calibration method adaptive to the same are included. The calibration device comprises a temperature detecting sensor, a memory, a current signal sampling circuit, a voltage signal sampling circuit, a microprocessor, and an electric energy metering chip with a built-in power gain correcting register. The electric energy metering chip, the temperature detecting sensor, and the memory are connected with the microprocessor. The current signal sampling circuit and the voltage signal sampling circuit are connected with the electric energy metering chip. The calibration method is mainly used in electric energy meter automatic compensation calibration technology according to temperature variation.
Description
Technical field
The present invention relates to electric energy meter electric energy metering error compensation technique field, be specifically related to a kind of calibration steps according to temperature, electric energy meter electric energy metering error being carried out to auto-compensation.
Background technology
Electric energy meter is used to the instrument of power consumption in metering circuit.When producing electric energy meter, the electric energy metrical accuracy of electric energy meter is all be calibration under the normal temperature working environment of 20 DEG C, inspection according to electric energy meter reference temperature when dispatching from the factory, and the electric energy metrical accuracy of electric energy meter is relevant with environment temperature.Due to the impact of practical service environment temperature variation, the electric energy metrical accuracy of electric energy meter can produce a relatively large deviation, thus makes electric energy meter accurately can not accomplish the justice of the electric energy metrical of power consumption.Therefore, design a kind of environmentally temperature variation automatically to carry out automatic calibration correcting method to the electric energy metrical precision of electric energy meter and seem extremely important.
Summary of the invention
The present invention is that the electric energy metrical accuracy in order to solve existing electric energy meter is larger by the impact of variation of ambient temperature, when causing using electric energy meter in the environment that temperature variation is larger, occur that the power consumption data of electric energy measurement data and the user's actual power consumption obtained exists relatively large deviation, affect the deficiency of electric energy metrical justice, there is provided a kind of can in time environmentally the power that makes new advances of temperature computation increase the correcting register calibration value that overflows and remove to replace power in electric energy computation chip and increase original power in the correcting register that overflows and increase the correcting register calibration value (calibration value when dispatching from the factory under reference temperature) that overflows, then electric energy computation chip gathers voltage signal and current signal, then electric energy computation chip increases with this new power the conversion that voltage signal that the correcting register calibration value that overflows collects electric energy computation chip and current signal carry out electric power signal, microcontroller acquires electric power signal carries out electric quantity accumulation, make the actual power consumption of user and the less calibration steps according to temperature, electric energy meter electric energy metering error being carried out to auto-compensation of electric energy meter electric energy measurement deviation.
Above technical matters is solved by following technical proposal:
According to temperature, electric energy meter electric energy metering error is carried out to the calibration steps of auto-compensation, comprise calibrating installation; Calibrating installation comprises: temperature detection sensor, storer, current signal sample circuit, voltage signal sampling circuit, be provided with in inside timer microprocessor and be provided with power in inside and increase the electric energy computation chip of correcting register of overflowing, wherein, electric energy computation chip, temperature detection sensor are connected with microprocessor respectively with storer, and current signal sample circuit is connected with electric energy computation chip respectively with voltage signal sampling circuit;
The calibration steps adapted with described calibrating installation is as follows:
(1-1) pre-set temperature detection interval time in the timer of microprocessor, when temperature detection interval time then, microprocessor sends temperature detection instruction to temperature detection sensor immediately, temperature detection sensor detects the temperature in electric energy meter immediately, and the temperature signal detected is uploaded to microprocessor;
(1-2) then, microprocessor reads the excessive correcting register calibration value (calibration value when dispatching from the factory under reference temperature) of original power increasing in storer immediately;
(1-3) temperature signal that transmits according to temperature detection sensor of microprocessor and original power increase the correcting register calibration value that overflows, and the power needing to re-write electric energy computation chip under calculating this temperature signal condition increases the new power overflow in correcting register and increases the correcting register calibration value that overflows;
(1-4) computation process that new power increases the correcting register calibration value that overflows is as follows:
If electric energy meter is at reference temperature T
0it is Z that power at DEG C increases the correcting register calibration value that overflows
0, then the error precision err that needs are revised when different temperatures T DEG C is:
err＝(T-T
0)K (1)；
If electric energy meter carries out error benefit correction variable when temperature is T is Pgain, then
The new power that then electric energy meter obtains after carrying out error compensation correction when temperature is T increases the correcting register calibration value Z that overflows
1for:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15) (3);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15when>=0,
Then Z
1=int (Z
0+ Pgain × 2
15) (4);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15during < 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15) (5);
Wherein: int () is bracket function, K is the average temperature coefficient needing to carry out negative temperature compensation, and T is the actual temperature in the electric energy meter that detects of temperature detection sensor;
(1-5) software for calculation in microprocessor calculates according to above-mentioned formula (1), (2), (3), (4), (5) the new excessive correcting register calibration value of power increasing that power increases the correcting register that overflows; If temperature detection sensor detects that the actual temperature T in electric energy meter there occurs change, the new power of the excessive correcting register of power increasing that so above-mentioned formula (1), (2), (3), (4), (5) are calculated increases the correcting register calibration value that overflows also can be different; So actual temperature T changes, the new excessive correcting register calibration value of power increasing that power will be made to increase excessive correcting register also ensues change, therefore, the new power calculated by the actual temperature T in electric energy meter that temperature detection sensor is detected is increased power that the correcting register calibration value that overflows removes to replace electric energy computation chip and increases the original power overflow in correcting register and increase the correcting register calibration value that overflows and can carry out auto-compensation calibration to the electric energy metering error of electric energy meter;
(1-6) after the excessive correcting register calibration value of original power increasing increased in excessive correcting register when power is increased by new power correcting register calibration value replacement of overflowing, electric energy computation chip sampled current signals and voltage signal being converted to electric power signal through integration in electric energy computation chip after power increases correcting register calibration of overflowing, and electric power signal is passed to microprocessor, carried out adding up and storing in memory to the electric power signal transmitted at every turn by microprocessor, thus achieve electric energy meter and according to actual temperature, the auto-compensation of electric energy meter electric energy metering error is calibrated.
This programme can in time environmentally temperature computation new power out increase the correcting register calibration value that overflows and remove to replace power and increase original power in the correcting register that overflows and increase the correcting register calibration value that overflows, then electric energy computation chip increases with this new power the correcting register calibration value that overflows and carries out the conversion of electric flux signal, and microcontroller acquires electric power signal carries out electric quantity accumulation.This programme can environmentally the change of temperature increase to the power in electric energy meter electric energy computation chip the calibration value of correcting register of overflowing in time and upgrades, thus the electric energy metrical that electric energy meter is obtained and actual power consumption deviation little, improve the fairness of electricity consumption.
As preferably, described current signal sample circuit comprises: node, No. two nodes, copper-manganese resistance, public negative pole end VSS, earth terminal, resistance R73, resistance R74, electric capacity C27 and electric capacity C28, one end of resistance R73 is connected with No. 1 current signal sample port of copper-manganese resistance, and the other end of resistance R73 is connected with a node; One end of resistance R74 is connected with No. 2 current signal sample port of copper-manganese resistance, and the other end of resistance R74 is connected with No. two nodes; One end of electric capacity C27 is connected with No. two nodes, and the other end of electric capacity C27 is connected with earth terminal; One end of electric capacity C28 is connected with a node, and the other end of electric capacity C28 is connected with earth terminal; The current channel of electric energy computation chip is just being simulated input pin and is being connected with No. two nodes, and the current channel negative analog input pin of electric energy computation chip is connected with a node, and No. 3 current signal sample port of copper-manganese resistance are connected with public negative pole end VSS;
Described voltage signal sampling circuit comprises: live wire end N1, No. three nodes, No. four nodes, resistance RA3, resistance RA4, resistance RA5, resistance RA6, resistance RA7, resistance RA8, resistance R112, resistance R115, electric capacity C39 and electric capacity C40, one end of resistance RA3 is connected with live wire end N1, the other end of resistance RA3 is connected with one end of resistance RA4, the other end of resistance RA4 is connected with one end of resistance RA5, the other end of resistance RA5 is connected with one end of resistance RA6, the other end of resistance RA6 is connected with one end of resistance RA7, the other end of resistance RA7 is connected with one end of resistance RA8, the other end of resistance RA8 is connected with No. three nodes, one end of resistance R112 is connected with No. three nodes, and the other end of resistance R112 is connected with earth terminal, one end of electric capacity C39 is connected with No. three nodes, and the other end of electric capacity C39 is connected with earth terminal, resistance R115 one end is connected with No. four nodes, and the other end of resistance R115 is connected with earth terminal, one end of electric capacity C40 is connected with No. four nodes, and the other end of electric capacity C40 is connected with earth terminal, the voltage channel of electric energy computation chip is just being simulated input pin and is being connected with No. three nodes, and the voltage channel negative analog input pin of electric energy computation chip is connected with No. four nodes,
Suppose resistance RA3=resistance RA4=resistance RA5=resistance RA6=resistance RA7=resistance RA8=150K Ω, resistance R112=resistance R115=1K Ω, electric capacity C39=electric capacity C40=33nF, power supply voltage is 220V, then the voltage sampling signal of electric energy computation chip is:
Because in formula (6), the denominator of electric resistance partial pressure is larger than molecule many, therefore only consider the temperature coefficient of resistance R112, the temperature coefficient of resistance RA3-RA8 is then ignored;
Because in resistance R112, copper-manganese resistance and electric energy computation chip, the temperature coefficient of these three devices of analog to digital converter reference source is all positive temperature coefficient (PTC)s, if set the average temperature coefficient of resistance R112 as K
1, set the average temperature coefficient of copper-manganese resistance as K
2if the average temperature coefficient of analog to digital converter reference source is K in electric energy computation chip
3, then the progressive mean temperature coefficient K of resistance R112, copper-manganese resistance and analog to digital converter reference source
0=K
1+ K
2+ K
3,
After then revising, the average temperature coefficient of table meter measuring error temperature impact is: k=K
0;
Therefore at reference temperature T
0when=20 DEG C, if actual temperature is T, then need adjust table meter measuring error be: err=(T-T
0) K=(T-20) K
0;
Then electric energy meter carries out the correction variable of error benefit when temperature is T, and to be Pgain be:
If original register calibration theoretical value of electric energy meter meter measuring error is Z
0,
Then need when actual temperature T changes to carry out table measurement amount error compensation respectively to the different Actual-Temperature-Points of electric energy meter, if set the table of electric energy meter to measure the revised new power of amount error compensation increase the correcting register calibration value that overflows as Z
1, then have:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, while Z
0+ Pgain × 2
15>=0,
Then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15< 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15).
As preferably, calibrating installation also comprises: No. five nodes, No. six nodes, feeder ear VCC, resistance R119, resistance R142 and resistance R143; The multiplexing pins of electric energy computation chip is connected with No. five nodes; One end of resistance R119 is connected with feeder ear VCC, the other end of resistance R119 is connected with No. five nodes, one end of resistance R142 is connected with No. five nodes, the other end of resistance R142 is connected with No. six nodes, one end of resistance R143 is connected with No. six nodes, and the other end of resistance R143 is connected with earth terminal; Microprocessor is connected with No. six nodes.
As preferably, electric energy computation chip adopts single-phase electric energy computation chip RN8209, and microprocessor adopts mixed signal microprocessor MSP430F449, and the current channel that No. 4 pins of single-phase electric energy computation chip RN8209 are single-phase electric energy computation chip RN8209 just simulates input pin, No. 5 pins of single-phase electric energy computation chip RN8209 are the current channel negative analog input pin of single-phase electric energy computation chip RN8209, No. 8 pins of single-phase electric energy computation chip RN8209 are that the voltage channel of single-phase electric energy computation chip RN8209 just simulates input pin, No. 9 pins of single-phase electric energy computation chip RN8209 are the voltage channel negative analog input pin of single-phase electric energy computation chip RN8209, 13 pins of single-phase electric energy computation chip RN8209 are the multiplexing pins of single-phase electric energy computation chip RN8209.
The present invention can reach following effect:
The present invention can in time environmentally temperature computation new power out increase the correcting register calibration value that overflows and remove to replace power and increase the original power overflow in correcting register and increase the correcting register calibration value that overflows, then electric energy computation chip increases with this new power the correcting register calibration value that overflows and carries out the conversion of electric flux signal, and microcontroller acquires electric power signal carries out electric quantity accumulation.The present invention can environmentally the change of temperature increase to the power in electric energy meter electric energy computation chip the calibration value of correcting register of overflowing in time and carries out with new, thus the electric energy metrical that electric energy meter is obtained and actual power consumption deviation little, improve the fairness of electricity consumption, reliability is high.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory syndeton schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
Embodiment, carries out the calibration steps of auto-compensation to electric energy meter electric energy metering error according to temperature, shown in Figure 1.Comprise calibrating installation; Calibrating installation comprises: temperature detection sensor S11, storer S12, current signal sample circuit S14, voltage signal sampling circuit S15, be provided with in inside timer S10 microprocessor S9 and be provided with power in inside and increase the electric energy computation chip S7 of correcting register S8 of overflowing, wherein, electric energy computation chip, temperature detection sensor are connected with microprocessor respectively with storer, and current signal sample circuit is connected with electric energy computation chip respectively with voltage signal sampling circuit;
The calibration steps adapted with described calibrating installation is as follows:
(1-1) pre-set temperature detection interval time in the timer of microprocessor, when temperature detection interval time then, microprocessor sends temperature detection instruction to temperature detection sensor immediately, temperature detection sensor detects the temperature in electric energy meter immediately, and the temperature signal detected is uploaded to microprocessor;
(1-2) then, microprocessor reads the excessive correcting register calibration value (calibration value when dispatching from the factory under reference temperature) of original power increasing in storer immediately;
(1-3) temperature signal that transmits according to temperature detection sensor of microprocessor and original power increase the correcting register calibration value that overflows, and the power needing to re-write electric energy computation chip under calculating this temperature signal condition increases the new power overflow in correcting register and increases the correcting register calibration value that overflows;
(1-4) computation process that new power increases the correcting register calibration value that overflows is as follows:
If electric energy meter is at reference temperature T
0it is Z that power at DEG C increases the correcting register calibration value that overflows
0, then the error precision err that needs are revised when different temperatures T DEG C is:
err＝(T-T
0)K (1)；
If electric energy meter carries out error benefit correction variable when temperature is T is Pgain, then
The new power that then electric energy meter obtains after carrying out error compensation correction when temperature is T increases the correcting register calibration value Z that overflows
1for:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15) (3);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15when>=0,
Then Z
1=int (Z
0+ Pgain × 2
15) (4);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15during < 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15) (5);
Wherein: int () is bracket function, K is the average temperature coefficient needing to carry out negative temperature compensation, and T is the actual temperature in the electric energy meter that detects of temperature detection sensor;
(1-5) software for calculation in microprocessor calculates according to above-mentioned formula (1), (2), (3), (4), (5) the new excessive correcting register calibration value of power increasing that power increases the correcting register that overflows; If temperature detection sensor detects that the actual temperature T in electric energy meter there occurs change, the new power of the excessive correcting register of power increasing that so above-mentioned formula (1), (2), (3), (4), (5) are calculated increases the correcting register calibration value that overflows also can be different; So actual temperature T changes, the new excessive correcting register calibration value of power increasing that power will be made to increase excessive correcting register also ensues change, therefore, the new power calculated by the actual temperature T in electric energy meter that temperature detection sensor is detected is increased power that the correcting register calibration value that overflows removes to replace electric energy computation chip and increases the original power overflow in correcting register and increase the correcting register calibration value that overflows and can carry out auto-compensation calibration to the electric energy metering error of electric energy meter;
(1-6) after the excessive correcting register calibration value of original power increasing increased in excessive correcting register when power is increased by new power correcting register calibration value replacement of overflowing, electric energy computation chip sampled current signals and voltage signal being converted to electric power signal through integration in electric energy computation chip after power increases correcting register calibration of overflowing, and electric power signal is passed to microprocessor, carried out adding up and storing in memory to the electric power signal transmitted at every turn by microprocessor, thus achieve electric energy meter and according to actual temperature, the auto-compensation of electric energy meter electric energy metering error is calibrated.
Described current signal sample circuit comprises: node S1, No. two node S2, copper-manganese resistance S13, public negative pole end VSS, earth terminal S16, resistance R73, resistance R74, electric capacity C27 and electric capacity C28, one end of resistance R73 is connected with No. 1 current signal sample port of copper-manganese resistance, and the other end of resistance R73 is connected with a node; One end of resistance R74 is connected with No. 2 current signal sample port of copper-manganese resistance, and the other end of resistance R74 is connected with No. two nodes; One end of electric capacity C27 is connected with No. two nodes, and the other end of electric capacity C27 is connected with earth terminal; One end of electric capacity C28 is connected with a node, and the other end of electric capacity C28 is connected with earth terminal; The current channel of electric energy computation chip is just being simulated input pin and is being connected with No. two nodes, and the current channel negative analog input pin of electric energy computation chip is connected with a node, and No. 3 current signal sample port of copper-manganese resistance are connected with public negative pole end VSS;
Described voltage signal sampling circuit comprises: live wire end N1, No. three node S3, No. four node S4, resistance RA3, resistance RA4, resistance RA5, resistance RA6, resistance RA7, resistance RA8, resistance R112, resistance R115, electric capacity C39 and electric capacity C40, one end of resistance RA3 is connected with live wire end N1, the other end of resistance RA3 is connected with one end of resistance RA4, the other end of resistance RA4 is connected with one end of resistance RA5, the other end of resistance RA5 is connected with one end of resistance RA6, the other end of resistance RA6 is connected with one end of resistance RA7, the other end of resistance RA7 is connected with one end of resistance RA8, the other end of resistance RA8 is connected with No. three nodes, one end of resistance R112 is connected with No. three nodes, and the other end of resistance R112 is connected with earth terminal, one end of electric capacity C39 is connected with No. three nodes, and the other end of electric capacity C39 is connected with earth terminal, resistance R115 one end is connected with No. four nodes, and the other end of resistance R115 is connected with earth terminal, one end of electric capacity C40 is connected with No. four nodes, and the other end of electric capacity C40 is connected with earth terminal, the voltage channel of electric energy computation chip is just being simulated input pin and is being connected with No. three nodes, and the voltage channel negative analog input pin of electric energy computation chip is connected with No. four nodes,
Suppose resistance RA3=resistance RA4=resistance RA5=resistance RA6=resistance RA7=resistance RA8=150K Ω, resistance R112=resistance R115=1K Ω, electric capacity C39=electric capacity C40=33nF, power supply voltage is 220V, then the voltage sampling signal of electric energy computation chip is:
Because in formula (6), the denominator of electric resistance partial pressure is larger than molecule many, therefore only consider the temperature coefficient of resistance R112, the temperature coefficient of resistance RA3-RA8 is then ignored;
Because in resistance R112, copper-manganese resistance and electric energy computation chip, the temperature coefficient of these three devices of analog to digital converter reference source is all positive temperature coefficient (PTC)s, if set the average temperature coefficient of resistance R112 as K
1, set the average temperature coefficient of copper-manganese resistance as K
2if the average temperature coefficient of analog to digital converter reference source is K in electric energy computation chip
3, then the progressive mean temperature coefficient K of resistance R112, copper-manganese resistance and analog to digital converter reference source
0=K
1+ K
2+ K
3,
After then revising, the average temperature coefficient of table meter measuring error temperature impact is: k=K
0;
Therefore at reference temperature T
0when=20 DEG C, if actual temperature is T, then need adjust table meter measuring error be: err=(T-T
0) K=(T-20) K
0;
Then electric energy meter carries out the correction variable of error benefit when temperature is T, and to be Pgain be:
If original register calibration theoretical value of electric energy meter meter measuring error is Z
0,
Then need when actual temperature T changes to carry out table measurement amount error compensation respectively to the different Actual-Temperature-Points of electric energy meter, if set the table of electric energy meter to measure the revised new power of amount error compensation increase the correcting register calibration value that overflows as Z
1, then have:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, while Z
0+ Pgain × 2
15>=0,
Then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15< 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15).
Calibrating installation also comprises: No. five node S5, No. six node S6, feeder ear VCC, resistance R119, resistance R142 and resistance R143; The multiplexing pins of electric energy computation chip is connected with No. five nodes; One end of resistance R119 is connected with feeder ear VCC, the other end of resistance R119 is connected with No. five nodes, one end of resistance R142 is connected with No. five nodes, the other end of resistance R142 is connected with No. six nodes, one end of resistance R143 is connected with No. six nodes, and the other end of resistance R143 is connected with earth terminal; Microprocessor is connected with No. six nodes.
The electric energy computation chip of this example adopts single-phase electric energy computation chip RN8209, and microprocessor adopts mixed signal microprocessor MSP430F449, and the current channel that No. 4 pins of single-phase electric energy computation chip RN8209 are single-phase electric energy computation chip RN8209 just simulates input pin, No. 5 pins of single-phase electric energy computation chip RN8209 are the current channel negative analog input pin of single-phase electric energy computation chip RN8209, No. 8 pins of single-phase electric energy computation chip RN8209 are that the voltage channel of single-phase electric energy computation chip RN8209 just simulates input pin, No. 9 pins of single-phase electric energy computation chip RN8209 are the voltage channel negative analog input pin of single-phase electric energy computation chip RN8209, 13 pins of single-phase electric energy computation chip RN8209 are the multiplexing pins of single-phase electric energy computation chip RN8209.
The present embodiment can in time environmentally temperature computation new power out increase the correcting register calibration value that overflows and remove to replace power and increase original power in the correcting register that overflows and increase the correcting register calibration value that overflows, then electric energy computation chip increases with this new power the correcting register calibration value that overflows and carries out the conversion of electric flux signal, and microcontroller acquires electric power signal carries out electric quantity accumulation.The present embodiment can environmentally the change of temperature increase to the power in electric energy meter electric energy computation chip the calibration value of correcting register of overflowing in time and upgrades, thus the electric energy metrical that electric energy meter is obtained and actual power consumption deviation little, improve the fairness of electricity consumption.
Describe embodiments of the present invention by reference to the accompanying drawings above, but do not limit by above-described embodiment when realizing, those of ordinary skill in the art can make a variety of changes within the scope of the appended claims or revise.
Claims (4)
1. according to temperature, electric energy meter electric energy metering error is carried out to a calibration steps for auto-compensation, it is characterized in that, comprise calibrating installation; Calibrating installation comprises: temperature detection sensor (S11), storer (S12), current signal sample circuit (S14), voltage signal sampling circuit (S15), be provided with in inside timer (S10) microprocessor (S9) and be provided with power in inside and increase the electric energy computation chip (S7) of correcting register (S8) of overflowing, wherein, electric energy computation chip, temperature detection sensor are connected with microprocessor respectively with storer, and current signal sample circuit is connected with electric energy computation chip respectively with voltage signal sampling circuit;
The calibration steps adapted with described calibrating installation is as follows:
(1-1) pre-set temperature detection interval time in the timer of microprocessor, when temperature detection interval time then, microprocessor sends temperature detection instruction to temperature detection sensor immediately, temperature detection sensor detects the temperature in electric energy meter immediately, and the temperature signal detected is uploaded to microprocessor;
(1-2) then, microprocessor reads the excessive correcting register calibration value of original power increasing in storer immediately;
(1-3) temperature signal that transmits according to temperature detection sensor of microprocessor and original power increase the correcting register calibration value that overflows, and the power needing to re-write electric energy computation chip under calculating this temperature signal condition increases the new power overflow in correcting register and increases the correcting register calibration value that overflows;
(1-4) computation process that new power increases the correcting register calibration value that overflows is as follows:
If electric energy meter is at reference temperature T
0it is Z that power at DEG C increases the correcting register calibration value that overflows
0, then the error precision err that needs are revised when different temperatures T DEG C is:
err＝(T-T
0)K (1)；
If electric energy meter carries out error benefit correction variable when temperature is T is Pgain, then
The new power that then electric energy meter obtains after carrying out error compensation correction when temperature is T increases the correcting register calibration value Z that overflows
1for:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15) (3);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15when>=0,
Then Z
1=int (Z
0+ Pgain × 2
15) (4);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15during < 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15) (5);
Wherein: int () is bracket function, K is the average temperature coefficient needing to carry out negative temperature compensation, and T is the actual temperature in the electric energy meter that detects of temperature detection sensor;
(1-5) software for calculation in microprocessor calculates according to above-mentioned formula (1), (2), (3), (4), (5) the new excessive correcting register calibration value of power increasing that power increases the correcting register that overflows; If temperature detection sensor detects that the actual temperature T in electric energy meter there occurs change, the new power of the excessive correcting register of power increasing that so above-mentioned formula (1), (2), (3), (4), (5) are calculated increases the correcting register calibration value that overflows also can be different; So actual temperature T changes, the new excessive correcting register calibration value of power increasing that power will be made to increase excessive correcting register also ensues change, therefore, the new power calculated by the actual temperature T in electric energy meter that temperature detection sensor is detected is increased power that the correcting register calibration value that overflows removes to replace electric energy computation chip and increases the original power overflow in correcting register and increase the correcting register calibration value that overflows and can carry out auto-compensation calibration to the electric energy metering error of electric energy meter;
(1-6) after the excessive correcting register calibration value of original power increasing increased in excessive correcting register when power is increased by new power correcting register calibration value replacement of overflowing, electric energy computation chip sampled current signals and voltage signal being converted to electric power signal through integration in electric energy computation chip after power increases correcting register calibration of overflowing, and electric power signal is passed to microprocessor, carried out adding up and storing in memory to the electric power signal transmitted at every turn by microprocessor, thus achieve electric energy meter and according to actual temperature, the auto-compensation of electric energy meter electric energy metering error is calibrated.
2. the calibration steps according to temperature, electric energy meter electric energy metering error being carried out to auto-compensation according to claim 1, it is characterized in that, described current signal sample circuit comprises: node (S1), No. two nodes (S2), copper-manganese resistance (S13), public negative pole end VSS, earth terminal (S16), resistance R73, resistance R74, electric capacity C27 and electric capacity C28, one end of resistance R73 is connected with No. 1 current signal sample port of copper-manganese resistance, and the other end of resistance R73 is connected with a node; One end of resistance R74 is connected with No. 2 current signal sample port of copper-manganese resistance, and the other end of resistance R74 is connected with No. two nodes; One end of electric capacity C27 is connected with No. two nodes, and the other end of electric capacity C27 is connected with earth terminal; One end of electric capacity C28 is connected with a node, and the other end of electric capacity C28 is connected with earth terminal; The current channel of electric energy computation chip is just being simulated input pin and is being connected with No. two nodes, and the current channel negative analog input pin of electric energy computation chip is connected with a node, and No. 3 current signal sample port of copper-manganese resistance are connected with public negative pole end VSS;
Described voltage signal sampling circuit comprises: live wire end N1, No. three nodes (S3), No. four nodes (S4), resistance RA3, resistance RA4, resistance RA5, resistance RA6, resistance RA7, resistance RA8, resistance R112, resistance R115, electric capacity C39 and electric capacity C40, one end of resistance RA3 is connected with live wire end N1, the other end of resistance RA3 is connected with one end of resistance RA4, the other end of resistance RA4 is connected with one end of resistance RA5, the other end of resistance RA5 is connected with one end of resistance RA6, the other end of resistance RA6 is connected with one end of resistance RA7, the other end of resistance RA7 is connected with one end of resistance RA8, the other end of resistance RA8 is connected with No. three nodes, one end of resistance R112 is connected with No. three nodes, and the other end of resistance R112 is connected with earth terminal, one end of electric capacity C39 is connected with No. three nodes, and the other end of electric capacity C39 is connected with earth terminal, resistance R115 one end is connected with No. four nodes, and the other end of resistance R115 is connected with earth terminal, one end of electric capacity C40 is connected with No. four nodes, and the other end of electric capacity C40 is connected with earth terminal, the voltage channel of electric energy computation chip is just being simulated input pin and is being connected with No. three nodes, and the voltage channel negative analog input pin of electric energy computation chip is connected with No. four nodes,
Suppose resistance RA3=resistance RA4=resistance RA5=resistance RA6=resistance RA7=resistance RA8=150K Ω, resistance R112=resistance R115=1K Ω, electric capacity C39=electric capacity C40=33nF, power supply voltage is 220V, then the voltage sampling signal of electric energy computation chip is:
Because in formula (6), the denominator of electric resistance partial pressure is larger than molecule many, therefore only consider the temperature coefficient of resistance R112, the temperature coefficient of resistance RA3-RA8 is then ignored;
Because in resistance R112, copper-manganese resistance and electric energy computation chip, the temperature coefficient of these three devices of analog to digital converter reference source is all positive temperature coefficient (PTC)s, if set the average temperature coefficient of resistance R112 as K
1, set the average temperature coefficient of copper-manganese resistance as K
2if the average temperature coefficient of analog to digital converter reference source is K in electric energy computation chip
3, then the progressive mean temperature coefficient K of resistance R112, copper-manganese resistance and analog to digital converter reference source
0=K
1+ K
2+ K
3,
After then revising, the average temperature coefficient of table meter measuring error temperature impact is: k=K
0;
Therefore at reference temperature T
0when=20 DEG C, if actual temperature is T, then need adjust table meter measuring error be: err=(T-T
0) K=(T-20) K
0;
Then electric energy meter carries out the correction variable of error benefit when temperature is T, and to be Pgain be:
If original register calibration theoretical value of electric energy meter meter measuring error is Z
0,
Then need when actual temperature T changes to carry out table measurement amount error compensation respectively to the different Actual-Temperature-Points of electric energy meter, if set the table of electric energy meter to measure the revised new power of amount error compensation increase the correcting register calibration value that overflows as Z
1, then have:
If Z
0the highest significant position bitf=1 of bit, then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, while Z
0+ Pgain × 2
15>=0,
Then Z
1=int (Z
0+ Pgain × 2
15);
If Z
0the highest significant position bitf=0 of bit, and Z
0+ Pgain × 2
15< 0,
Then Z
1=int (2
16+ Z
0+ Pgain × 2
15).
3. the calibration steps according to temperature, electric energy meter electric energy metering error being carried out to auto-compensation according to claim 1, it is characterized in that, calibrating installation also comprises: No. five nodes (S5), No. six nodes (S6), feeder ear VCC, resistance R119, resistance R142 and resistance R143; The multiplexing pins of electric energy computation chip is connected with No. five nodes; One end of resistance R119 is connected with feeder ear VCC, the other end of resistance R119 is connected with No. five nodes, one end of resistance R142 is connected with No. five nodes, the other end of resistance R142 is connected with No. six nodes, one end of resistance R143 is connected with No. six nodes, and the other end of resistance R143 is connected with earth terminal; Microprocessor is connected with No. six nodes.
4. the calibration steps according to temperature, electric energy meter electric energy metering error being carried out to auto-compensation according to claim 1, it is characterized in that, electric energy computation chip adopts single-phase electric energy computation chip RN8209, and microprocessor adopts mixed signal microprocessor MSP430F449, and the current channel that No. 4 pins of single-phase electric energy computation chip RN8209 are single-phase electric energy computation chip RN8209 just simulates input pin, No. 5 pins of single-phase electric energy computation chip RN8209 are the current channel negative analog input pin of single-phase electric energy computation chip RN8209, No. 8 pins of single-phase electric energy computation chip RN8209 are that the voltage channel of single-phase electric energy computation chip RN8209 just simulates input pin, No. 9 pins of single-phase electric energy computation chip RN8209 are the voltage channel negative analog input pin of single-phase electric energy computation chip RN8209, 13 pins of single-phase electric energy computation chip RN8209 are the multiplexing pins of single-phase electric energy computation chip RN8209.
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Address after: Hangzhou City, Zhejiang province Xihu District 310024 Tong Street No. 173 Fu Lu Liang Patentee after: Hangzhou Xili intelligent Polytron Technologies Inc Address before: 310014 Zhejiang, Xihu District Tong Tong Street turn to science and technology economic block block No. 11 Patentee before: HANGZHOU XILI WATT-HOUR METER MANUFACTURE CO., LTD. |