CN103149397A - Electric energy metering creeping algorithm and control circuit - Google Patents
Electric energy metering creeping algorithm and control circuit Download PDFInfo
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- CN103149397A CN103149397A CN2013100659419A CN201310065941A CN103149397A CN 103149397 A CN103149397 A CN 103149397A CN 2013100659419 A CN2013100659419 A CN 2013100659419A CN 201310065941 A CN201310065941 A CN 201310065941A CN 103149397 A CN103149397 A CN 103149397A
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Abstract
The invention discloses an electric energy metering creeping algorithm and an electric energy metering creeping control circuit. The creeping algorithm comprises the following steps of: 1, judging whether sign bits of adjacent power are consistent, if the sign bits are not consistent, electric energy creeps, and if the sign bits are consistent, the electric energy does not creep; and 2, if the electric energy creeps, removing the accumulation of the current power without removal of the previously metered electric quantity, and otherwise, continuously accumulating the power and metering the electric quantity. The electric energy metering creeping control circuit comprises a first register and an exclusive-OR gate. By the creeping algorithm and the control circuit, creeping can be accurately judged, and the interference and influence of the creeping on electric energy metering are avoided.
Description
Technical field
The invention belongs to the technical field of electric energy metrical, particularly a kind of computing method of electric energy shunt running and control device.
Background technology
In the electric energy metrical field, in the situation that the situation appearance that the electrical appliance ammeter is had good luck need to shield for the power in minimum situation, think that power is 0 in order to prevent the user when minimum power, so just do not have the situation appearance that ammeter is had good luck, i.e. so-called shunt running.
Can why in the situation that the user does not make electrical appliance, also minimum power appear? this is because the noise of ammeter computation chip itself causes.Therefore, the error of calculation for fear of the electric energy shunt running brings needs to calculate elimination in the energy calculate process, with accurate-metering user's electric energy operating position.Typical shunt running algorithm is (as described in patented claim 200610162224.8) as shown in Figure 1.
Typical shunt running algorithm flow is described below.
A, at first judge the positive and negative of power;
B, according to the positive and negative selection threshold value of power, general threshold value 1 and threshold value 2 are numbers that absolute value equates, but one be positive number, one is negative.If power is just selected positive threshold value for just; Otherwise just select negative threshold value;
C, subtract the difference of threshold value according to the positive negative judgement power of power: if power for just, threshold value is also for just, power subtracted threshold value less than 0 o'clock, thought shunt running; Otherwise, be not shunt running.If power is for negative, also for negative, power subtracted threshold value greater than 0 o'clock to threshold value, thought shunt running; Otherwise, be not shunt running.
D, according to whether the output of shunt running power ratio control: if shunt running, power stage is 0; Otherwise power is directly exported.
E, the last cumulative electric quantity metering that carries out according to power.
This mode; although can realize the judgement of electric energy shunt running; but this mode judges by threshold values; the selection of threshold values just is called the key factor that affects the shunt running metering; and threshold values often can be subject to the interference of various factors; therefore be not very accurate to the calculating of shunt running, and typical shunt running algorithm need the selector switch (is used for selecting threshold value, an output of selecting power) of two multidigits, the subtracter of a multidigit, the comparer of a multidigit at least.Structure is relatively complicated, and it is many that step is controlled in judgement.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of electric energy metrical shunt running algorithm and control circuit, this shunt running algorithm and control circuit can judge shunt running exactly, avoid shunt running on interference and the impact of electric energy metrical.
Another object of the present invention is to provide a kind of electric energy metrical shunt running algorithm and control circuit, and this shunt running algorithm and control circuit can judge the electric energy shunt running quickly and accurately, and in time zero clearing; And this shunt running algorithm and control device are easy to realize, can greatly reduce costs than existing algorithm, and the enough resources still less of energy realize calculating and the control of electric energy shunt running.
For achieving the above object, technical scheme of the present invention is as follows.
A kind of electric energy metrical shunt running algorithm, this shunt running algorithm comprises the steps:
1, before and after the judgement, whether the sign bit of adjacent power is consistent: if inconsistent, just think shunt running; Otherwise, be not shunt running;
2 if the cumulative of current power just removed in shunt running, but the electric weight of metering before not removing; Otherwise, continue the metering of the cumulative and electric weight of power.
Further, in step 1,101, under noise effect, during minimum power, the sign bit of power changes, and power has on the occasion of negative value is also arranged.At first get the sign bit sign of power P ower, the most significant digit of power P ower value is exactly sign bit.
Further again, 102, the sign bit sign of power is deposited with the first register Reg1, this is equivalent to power symbol sign is postponed a beat.Described sign is connected to the D end of the first register Reg1, upgrades with the Power value clock end that the clock CLK of synchronizeing is connected to register Reg1, the Q end output sign_reg of the first register Reg1, and sign_reg is the sign bit of a upper performance number.
103, sign and sign_reg are through XOR gate output clear signal, and sign is connected to the A end of XOR gate, and sign_reg is connected to the B end of XOR gate, and the clear signal is by the Z end output of XOR gate, clear=sign﹠amp; A sign_reg+! Sign﹠amp; Sign_reg: if sign is different from sign_reg, clear is just 1, is shunt running; Otherwise clear is 0, is not shunt running.
Further, in step 2, by totalizer, power P ower and accu_sum_reg addition are obtained accu_sum, wherein, described power P ower is connected the input end of totalizer with accu_sum_reg, the output accu_sum of totalizer is connected to the D end of the second register Reg2; Accu_sum_reg is subjected to the clear signal controlling from the Q end of the second register Reg2, and clear is connected to the CLR end of the second register Reg2, if clear=1, accu_sum_reg=0; Otherwise, accu_sum_reg=accu_sum; Namely when shunt running, cumulative and accu_sum_reg before makes zero, and restarts power and adds up, and so just can avoid also having the electric quantity metering situation to occur when minimum power.
A kind of electric energy metrical shunt running control circuit is characterized in that this circuit includes the first register and an XOR gate, and described the first register is connected in power P ower output terminal, after XOR gate is connected in the first register, and output clear signal.
The sign bit sign that gets power P ower inputs to the first register, and the most significant digit of performance number is exactly sign bit, so only needs the most significant digit of performance number is connected by line to get final product, and does not need unnecessary device.
The first above-mentioned register, sign are connected to the D end of the first register Reg1, upgrade with the Power value clock end that the clock CLK of synchronizeing is connected to register Reg1, and the Q end output sign_reg of the first register Reg1 is to XOR gate.
Above-mentioned control circuit, its sign are also connected to the A end of XOR gate, and sign_reg is connected to the B end of XOR gate, and the clear signal is by the Z end output of XOR gate.
Described control circuit, it also further includes totalizer and the second register, described totalizer obtains accu_sum with power P ower and accu_sum_reg addition, wherein, described power P ower is connected the input end of totalizer with accu_sum_reg, the output accu_sum of totalizer is connected to the D end of the second register Reg2; Accu_sum_reg is from the Q end of the second register Reg2, and the clear signal of the first register Reg1 output is connected to the CLR end of the second register Reg2.By clear signal controlling accu_sum_reg, if clear=1, accu_sum_reg=0; Otherwise, accu_sum_reg=accu_sum; That is to say when shunt running, power before is cumulative to make zero with accu_sum_reg, restarts power and adds up, and so just can avoid also having the electric quantity metering situation to occur when minimum power.
Resource required for the present invention is compared with typical shunt running algorithm and is reduced a lot, only needs a register and an XOR gate just can realize the judgement of power shunt running.Compare with typical shunt running algorithm, reduced by three flow processs: according to the positive and negative selection threshold value of power, subtract the difference of threshold value and the output of power according to the positive negative judgement power of power.Importantly, needn't select threshold values, improve accuracy and reliability that shunt running is calculated, can judge exactly the shunt running in electric energy metrical.
In typical shunt running algorithm, need at least the selector switch (is used for selecting threshold value, an output of selecting power) of two multidigits, the subtracter of a multidigit, the comparer of a multidigit to complete the processing of shunt running.Before and after the present invention only need judge, whether the sign bit of adjacent power is consistent, just can carry out the shunt running judgement, and then the metering of the cumulative and electric energy of power ratio control, simple in structure like this, be easy to realize, can the decrease shunt running control cost, and the saving chip cost.
Description of drawings
Fig. 1 is the process flow diagram that prior art is implemented.
Fig. 2 is the principle schematic that the present invention implements.
Fig. 3 is the structural representation that the present invention implements the shunt running control device.
Fig. 4 is the process flow diagram that the present invention implements the shunt running algorithm.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Please refer to shown in Figure 2ly, the electric energy shunt running algorithm that the present invention implements is mainly to determine whether it being shunt running by the judgement to the power sign bit, if the sign bit of front and back power is consistent, is not shunt running; Inconsistently be judged as shunt running.For shunt running, do not carry out power and add up, do not calculate electric weight; During for non-shunt running, carry out continuously power and add up, calculate electric weight, thereby carry out electric weight output accurately.
The hardware configuration that concrete electric energy shunt running algorithm is realized as shown in Figure 3.The process flow diagram of electric energy shunt running algorithm as shown in Figure 4.
In conjunction with Fig. 3 and Fig. 4, the implementation procedure of electric energy shunt running algorithm and control is:
1, under noise effect, during minimum power, the sign bit of power changes, and power has on the occasion of negative value is also arranged.At first get the sign bit sign of power P ower, the most significant digit of performance number is exactly sign bit, only needs the most significant digit of performance number is connected by line to get final product, and does not need unnecessary device.
2, power symbol sign is deposited with register Reg1, be equivalent to power symbol sign is postponed a beat, obtain sign_reg.
Wherein, sign is connected to the D end of register Reg1, upgrades with the Power value clock end that the clock CLK of synchronizeing is connected to register Reg1, the Q end output sign_reg of register Reg1, and sign_reg is the sign bit of a upper performance number.
3, sign and sign_reg through XOR gate output clear signal, determine whether shunt running by the clear signal.
Wherein, sign is connected to the A end of XOR gate, and sign_reg is connected to the B end of XOR gate, and the clear signal is by the Z end output of XOR gate.
Clear=sign﹠amp; A sign_reg+! Sign﹠amp; Sign_reg: if sign is different from sign_reg, clear is just 1, is shunt running; Otherwise clear is 0, is not shunt running.
4, power P ower and accu_sum_reg addition obtain accu_sum, and Power is connected the input end of totalizer with accu_sum_reg, and the output accu_sum of totalizer is connected to the D end of register Reg2; Accu_sum_reg is subjected to the clear signal controlling from the Q end of register Reg2, and clear is connected to the CLR end of register Reg2, if clear=1, accu_sum_reg=0; Otherwise, accu_sum_reg=accu_sum; Namely when shunt running before cumulative and accu_sum_reg before removing, restart power cumulative, so just can avoid also having the appearance of electric quantity metering situation when minimum power.
Wherein, Power: performance number, multidigit signed number.
The sign bit of sign:Power.
The register output of sign_reg:Sign.
CLK: upgrade the clock of synchronizeing with Power.
Clear: shunt running signal.
Accu_sum:Power cumulative and.
Accu_sum register output under the accu_sum_reg:clear signal controlling.
Resource required for the present invention is compared with typical shunt running algorithm and is reduced a lot, only needs a register and an XOR gate just can realize the judgement of power shunt running.In typical shunt running algorithm, need at least the selector switch (is used for selecting threshold value, an output of selecting power) of two multidigits, the subtracter of a multidigit, the comparer of a multidigit to complete the processing of shunt running.The present invention compares with typical shunt running algorithm, has reduced by three flow processs: according to the positive and negative selection threshold value of power, subtract the difference of threshold value and the output of power according to the positive negative judgement power of power.Importantly, needn't select threshold values, improve accuracy and reliability that shunt running is calculated, can judge exactly the shunt running in electric energy metrical.
And the present invention implement simple in structure, be easy to realize, can the decrease shunt running control cost, save chip cost.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an electric energy metrical shunt running algorithm, is characterized in that this shunt running algorithm comprises the steps:
1), before and after the judgement, whether the sign bit of adjacent power is consistent: if inconsistent, just think shunt running; Otherwise, be not shunt running;
2) if the cumulative of current power just removed in shunt running, but the electric weight of metering before not removing; Otherwise, continue the metering of the cumulative and electric weight of power.
2. electric energy metrical shunt running algorithm as claimed in claim 1, is characterized in that further, in step 1), under noise effect, during minimum power, at first gets the sign bit sign of power, and the most significant digit of performance number is exactly sign bit.
3. electric energy metrical shunt running algorithm as claimed in claim 2, is characterized in that the sign bit sign of power is deposited with the first register, and the output sign_reg of the first register, sign_reg are the sign bits of a upper performance number.
4. electric energy metrical shunt running algorithm as claimed in claim 3, is characterized in that sign and sign_reg are through XOR gate output clear signal, clear=sign﹠amp; A sign_reg+! Sign﹠amp; Sign_reg: if sign is different from sign_reg, clear is just 1, is shunt running; Otherwise clear is 0, is not shunt running.
5. electric energy metrical shunt running algorithm as claimed in claim 1, it is characterized in that step 2) in, by totalizer, power P ower and accu_sum_reg addition are obtained accu_sum, wherein, described power P ower is connected the input end of totalizer with accu_sum_reg, the output accu_sum of totalizer is connected to the second register; Accu_sum_reg is subjected to the clear signal controlling from the second register, and clear is connected to the second register, if clear=1, accu_sum_reg=0; Otherwise, accu_sum_reg=accu_sum.
6.
.A kind of electric energy metrical shunt running control circuit is characterized in that this circuit includes the first register and an XOR gate, and described the first register is connected in power P ower output terminal, after XOR gate is connected in the first register, and output clear signal.
7.
.Electric energy metrical shunt running control circuit as claimed in claim 6 is characterized in that the sign bit sign that gets power P ower inputs to the first register, and the most significant digit of performance number is exactly sign bit.
8.
.Electric energy metrical shunt running control circuit as claimed in claim 7, it is characterized in that the first above-mentioned register, sign is connected to the D end of the first register, upgrade with performance number the clock end that the clock CLK of synchronizeing is connected to the first register, the Q end output sign_reg of the first register is to XOR gate.
9.
.Electric energy metrical shunt running control circuit as claimed in claim 8 is characterized in that above-mentioned control circuit, and its sign is also connected to the A end of XOR gate, and sign_reg is connected to the B end of XOR gate, and the clear signal is by the Z end output of XOR gate.
10. electric energy metrical shunt running control circuit as claimed in claim 6, it is characterized in that described control circuit, it also includes totalizer and the second register, described totalizer obtains accu_sum with Power and accu_sum_reg addition, wherein, described Power is connected the input end of totalizer with accu_sum_reg, the output accu_sum of totalizer is connected to the D end of the second register; Accu_sum_reg is from the Q end of the second register, and the clear signal of the first register output is connected to the CLR end of the second register.
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Address after: 518000 Nanhai Avenue, Nanshan District, Shenzhen City, Guangdong Province, 1079 Garden City Digital Building, Block A, 901A Patentee after: Xinhai Science and Technology (Shenzhen) Co., Ltd. Address before: 518067 Nanshan District, Shenzhen, Nanhai Avenue, garden city, No. 1079, building A, block, floor 9 Patentee before: Xinhai Science and Technology Co., Ltd., Shenzhen City |