CN102128976A - Energy pulse output method and device of electric energy meter and electric energy meter - Google Patents
Energy pulse output method and device of electric energy meter and electric energy meter Download PDFInfo
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Abstract
The invention relates to the field of electronics and discloses an energy pulse output method and an energy pulse output device of an electric energy meter, and the electric energy meter. Two low-pass filters with different performance are designed. When the effective value of a current is less than or equal to a preset threshold, the low-pass filter which has a longer step response time but has higher attenuation degree to a non-direct current low-frequency part is selected, so that the attenuation to the non-direct current low-frequency part of transient power is better and the energy pulse jitter when a small signal is input is improved. When the effective value of the current is more than the preset threshold, the low-pass filter which has lower attenuation degree to the non-direct current low-frequency part but has a shorter step response time is selected, so that the instantaneity of energy pulse output is not affected.
Description
Technical field
The present invention relates to electronic applications, particularly the electric energy meter in the electronic applications.
Background technology
Electric energy meter is to aanalogvoltage and current sample and convert their digital form to, so that the metering circuit of back calculates data such as electric energy, power and effective value by Sigma-delta analog to digital converter (∑-Δ ADC).
The basic structure of existing electric energy meter as shown in Figure 1, magnitude of voltage U and current value I become digital signal corresponding u and i through ∑-Δ analog to digital converter respectively, the digital signal of difference representative voltage value and current value, after multiplying each other, u and i obtain instantaneous power p (t), instantaneous power obtains filtering back instantaneous power P1 after through a low-pass filter LPF1, and filter back instantaneous power obtains energy pulse CF through the numerical frequency converter.
Specifically, the expression formula of supposing voltage u and current i is respectively:
Wherein, ω represents the frequency of noise, various noise (noise) sum in the back expression voltage and current signal in the expression formula of u and i.
Instantaneous power p (t) multiplies each other and can get by voltage and current:
Wherein, first is net horsepower
Its remainder is a power noise.
The effect of low-pass filter LPF1 is the non-direct current component that filters among the instantaneous power p (t), obtains filtering the back instantaneous power.The numerical frequency converter is instantaneous power after filtering to be added to certain certain value just export an energy pulse CF, so the output frequency of energy pulse and filter back instantaneous power are directly proportional.If the instantaneous power after the filter is a certain constant, then the frequency of numerical frequency converter output is a certain single-frequency just, if and the instantaneous power after the filter contains many power noises, then the pulse of numerical frequency converter output will produce beat (jitter).
The present inventor finds that in single-phase copper-manganese was used, because the current signal input value is very little, therefore the precision of electric energy meter was beated bigger when small-signal is imported.This be because, in the electric energy meter practical application, magnitude of voltage is constant, current value changes along with the variation of load.When current value ratio hour, I value in the formula 2 is smaller, and noise is constant, the signal to noise ratio (S/N ratio) of current signal is just lower like this, the signal to noise ratio (S/N ratio) of instantaneous power is also corresponding lower, instantaneous power after the filter also just contains many noises, and therefore, the jitter values of the output frequency of energy pulse is bigger during small-signal.And if select the low-pass filter bigger for use to the attenuation degree of non-direct current low frequency part, no doubt can improve the situation of beating of small-signal, but, LPF1 is big more to the decay of non-direct current low frequency part, then the step response time of LPF1 is long more, if the output recurrent interval of the step response time of LPF1 and energy pulse CF is similar, then can influence energy pulse CF output.Because the energy pulse output gap during large-signal is little, this has determined that the step response time of LPF1 is shorter, therefore, in existing electric energy meter structure, usually select for use step response time short but, thereby caused the precision of electric energy meter when small-signal the is imported bigger problem of beating the imperfect low-pass filter of the decay of non-direct current low frequency part.
Summary of the invention
The object of the present invention is to provide a kind of energy pulse output intent, device and electric energy meter of electric energy meter, under the situation of the energy pulse output instantaneity that guarantees not influence large-signal, the situation of beating of the precision in the time of can effectively improving the electric energy meter small-signal.
For solving the problems of the technologies described above, the invention provides a kind of energy pulse output intent of electric energy meter, comprise following steps:
Select corresponding low-pass filter that instantaneous power is carried out filtering according to the watt current value of the current signal of importing, afterwards according to filtered filter back instantaneous power, output energy pulse;
The step response time of the low-pass filter of selecting in limited time greater than preset gate when effective current value is shorter than the step response time that watt current value is less than or equal to the low-pass filter that described preset gate selects in limited time.
The present invention also provides a kind of energy pulse output unit, comprises:
First low-pass filter and second low-pass filter are respectively applied for input signal are carried out low-pass filtering; Wherein, the step response time of first low-pass filter is shorter than the step response time of second low-pass filter;
The current effective value computing module is used to calculate the watt current value of the current signal of input;
Select module, be used for watt current value, select instantaneous power is carried out the low-pass filter of low-pass filtering, wherein, prescribe a time limit greater than preset gate, select first low-pass filter when the watt current value of calculating according to the calculating of current effective value computing module; When the watt current value of calculating is less than or equal to preset gate in limited time, select second low-pass filter;
The numerical frequency converter is used for according to filter back instantaneous power, and the output energy pulse wherein, is filtered the back instantaneous power for after with the low-pass filter of selecting module to select instantaneous power being carried out low-pass filtering, instantaneous power after the filter that obtains.
The present invention also provides a kind of electric energy meter, comprises above-mentioned energy pulse output unit.
Further, both can carry out the selection of low-pass filter earlier,, obtain filtering the back instantaneous power by the low-pass filter that enables to select; Also can carry out low-pass filtering to instantaneous power respectively by first low-pass filter and second low-pass filter earlier, by will be through the filtered instantaneous power of the low-pass filter of selecting as instantaneous power after the effective filter, abandon through the filtered instantaneous power of non-selected low-pass filter, obtain filtering the back instantaneous power.Make the present invention to realize flexible and changeablely.
Further, preset that thresholding can be a fixed value or the current value when using according to electric energy meter typical case obtains, for the current value of input belongs to the judgement of large-signal or small-signal, a rational criterion is provided, thereby has guaranteed the accuracy of the bandpass filter selected.
The present invention compared with prior art, the key distinction and effect thereof are:
The low-pass filter of two different performances of design selects instantaneous power is carried out the low-pass filter of low-pass filtering according to the current effective value that calculates, will be after the filtered filter of the low-pass filter of selecting instantaneous power as the input signal of numerical frequency converter.Wherein, the step response time of first low-pass filter is shorter than the step response time of second low-pass filter, second low-pass filter to the attenuation degree of non-direct current low frequency part attenuation degree to non-direct current low frequency part greater than first low-pass filter.Because when current effective value is less than or equal to preset gate in limited time, the current value that input is described belongs to small-signal, can select this moment step response time to grow but the low-pass filter bigger to the attenuation degree of non-direct current low frequency part, make the non-direct current low-frequency noise to instantaneous power partly decay better, thus the beating of the energy pulse when improving small-signal and importing.Prescribe a time limit greater than preset gate when current effective value, illustrate that the current value of input belongs to large-signal, can select lower but the low-pass filter that step response time is short of the attenuation degree to non-direct current low frequency part this moment, in order to avoid have influence on the instantaneity of energy pulse output.Therefore, under the situation of the energy pulse output instantaneity that guarantees not influence large-signal, the situation of beating of the precision in the time of can effectively improving the electric energy meter small-signal.
Description of drawings
Fig. 1 is the basic structure synoptic diagram according to electric energy meter of the prior art;
Fig. 2 is the energy pulse output intent process flow diagram according to the electric energy meter of first embodiment of the invention;
Fig. 3 is the basic structure synoptic diagram according to the electric energy meter of first embodiment of the invention;
Fig. 4 is the amplitude-frequency response synoptic diagram according to LPF1 in the first embodiment of the invention and LPF2;
Fig. 5 is the step response synoptic diagram according to LPF1 in the first embodiment of the invention and LPF2;
Fig. 6 is the basic structure synoptic diagram according to the electric energy meter of second embodiment of the invention;
Fig. 7 is the structural representation according to the energy pulse output unit of third embodiment of the invention;
Fig. 8 is the structural representation according to the energy pulse output unit of fourth embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the invention are described in further detail below in conjunction with accompanying drawing.
The invention provides a kind of energy pulse output intent and electric energy meter of electric energy meter, select corresponding low-pass filter that instantaneous power is carried out filtering according to the watt current value of the current signal of importing, when effective current value is selected the short low-pass filter of step response time in limited time greater than preset gate.
Embodiment one
Present embodiment relates to a kind of energy pulse output intent of electric energy meter, and idiographic flow as shown in Figure 2.
In step 210, calculate the watt current value of the current signal of input.Specifically, in the present embodiment, according to formula:
Calculate watt current value I
RmsWherein, N indication cycle sampling number, i are represented the digital signal that is converted to of current signal by input.In addition, it will be understood by those skilled in the art that in actual applications, also can calculate I according to other formula that can characterize the current signal size of input
Rms, do not give unnecessary details one by one at this.
Then, in step 220, select low-pass filter, if the watt current value of calculating is then selected first low-pass filter greater than presetting thresholding according to the watt current value of calculating.Preset thresholding if the watt current value of calculating is less than or equal to, then select second low-pass filter.In the present embodiment, there are 2 low-pass filters in the electric energy meter: the first low-pass filter LPF1 and the second low-pass filter LPF2.Wherein, the step response time of first low-pass filter is shorter than the step response time of second low-pass filter, second low-pass filter to the attenuation degree of non-direct current low frequency part attenuation degree to non-direct current low frequency part greater than first low-pass filter.
Current value when specifically, this presets thresholding and can use according to electric energy meter typical case obtains.5% of current value when being limited to electric energy meter typical case application with preset gate is an example, if the watt current value of calculating is greater than 5%lb (current value when lb is electric energy meter typical case application), think that then the current signal of input belongs to large-signal, energy pulse CF output gap is shorter, should select the short LPF1 of step response time for use; If the watt current value of calculating is less than or equal to 5%lb, think that then the current signal of input belongs to small-signal, energy pulse CF output gap is longer, should select the long LPF2 of step response time for use.In addition, in actual applications, presetting thresholding also can be a fixed value.
In the present embodiment, the amplitude-frequency response characteristic of LPF1 | H
LPF1(f) | for:
The amplitude-frequency response characteristic of LPF2 | H
LPF2(f) | for:
Wherein, f represents frequency variable.The amplitude-frequency response of low-pass filter LPF1 and LPF2 as shown in Figure 4, step response as shown in Figure 5, though the step response of LPF2 is longer, its decay to low-frequency noise is better, can reduce the low frequency power noise of instantaneous power, thereby the small-signal that reduces electric energy meter is beated.
In addition, be appreciated that, first low-pass filter in the present embodiment and the amplitude-frequency response characteristic of second low-pass filter, it is a concrete realization example, in actual applications, the bandpass filter that can also adopt other is not given unnecessary details at this one by one as first low-pass filter and second low-pass filter.
As shown in Figure 3, the digital signal u of magnitude of voltage and current value and i are multiplied each other obtain instantaneous power after, the first low-pass filter LPF1 and the second low-pass filter LPF2 carry out low-pass filtering to instantaneous power respectively.On the other hand, with the watt current value calculated with preset thresholding and compare, and select low-pass filter according to comparative result.If that select is LPF1, then will abandon filtered instantaneous power P2 through the filtered instantaneous power P1 of LPF1 as instantaneous power after effectively filtering through LPF2.If that select is LPF2, then will abandon filtered instantaneous power P1 through the filtered instantaneous power P2 of LPF2 as instantaneous power after effectively filtering through LPF1.Select P1 or P2 as effectively filtering the back instantaneous power, can realize by MUX MUX.
Then, in step 230, by the numerical frequency converter according to filter back instantaneous power, the output energy pulse, this filter back instantaneous power is after the low-pass filter selected carries out low-pass filtering to instantaneous power, instantaneous power after the filter that obtains.As shown in Figure 3, MUX is input to P1 or the P2 that selects in the numerical frequency converter, exports energy pulse by the numerical frequency converter according to filter back instantaneous power.The specific implementation of numerical frequency converter output energy pulse is same as the prior art, does not repeat them here.
Be not difficult to find, in the present embodiment,, judge the size of electric current input value, thereby select to use which low-pass filter according to current effective value by designing two different performance low-pass filter LPF1 and LPF2.Owing to preset thresholding when (promptly Shu Ru current value belongs to small-signal) when effective current value is less than or equal to, can select step response time to grow but the low-pass filter bigger to the attenuation degree of non-direct current low frequency part, make the non-direct current low-frequency noise to instantaneous power partly decay better, thus the beating of the energy pulse when improving small-signal and importing.When effective current value greater than presetting thresholding when (promptly Shu Ru current value belongs to large-signal), can select lower but the low-pass filter that step response time is short of attenuation degree to non-direct current low frequency part, in order to avoid have influence on the instantaneity of energy pulse output.Therefore, under the situation of the energy pulse output instantaneity that guarantees not influence large-signal, the situation of beating of the precision in the time of can effectively improving the electric energy meter small-signal.
And, current value when presetting thresholding and can use according to electric energy meter typical case obtains or is set to a fixed value, for the current value of input belongs to the judgement of large-signal or small-signal, a rational criterion is provided, thereby has guaranteed the accuracy of the low-pass filter selected.In addition, though be appreciated that in the present embodiment that 5% of current value when being limited to the electric energy meter typical case and using with preset gate be that example describes, in actual applications, other number percents of the current value when presetting thresholding and also can be taken as electric energy meter typical case application.
Embodiment two
Present embodiment relates to a kind of energy pulse output intent of electric energy meter.Second embodiment and first embodiment are basic identical, difference mainly is: in first embodiment, by will be through the filtered instantaneous power of the low-pass filter of selecting as instantaneous power after the effective filter, abandon through the filtered instantaneous power of non-selected low-pass filter, obtain filtering the back instantaneous power.
Yet in a second embodiment, in the following manner, obtain filtering the back instantaneous power: the low-pass filter that enables to select, remove to enable non-selected low-pass filter.The low-pass filter of selecting carries out low-pass filtering to instantaneous power after being enabled.
As shown in Figure 6, the digital signal u of magnitude of voltage and current value and i are multiplied each other obtain instantaneous power P (t) after, according to watt current value of calculating and the comparative result that presets thresholding, select instantaneous power is carried out the low-pass filter of low-pass filtering.If what select is LPF1 (promptly the watt current value of Ji Suaning is greater than presetting thresholding), then enable LPF1, by LPF1 instantaneous power is carried out low-pass filtering, obtain filtering the back instantaneous power; If what select is LPF2 (i.e. watt current value of Ji Suaning be less than or equal to preset thresholding), then enable LPF2, by LPF2 instantaneous power is carried out low-pass filtering, obtain filtering instantaneous power afterwards.Instantaneous power is input in the numerical frequency converter after the filter that obtains after LPF1 or LPF2 filtering, exports energy pulse by the numerical frequency converter according to filter back instantaneous power.
Owing to both can carry out the selection of low-pass filter earlier,, obtain filtering the back instantaneous power by the low-pass filter that enables to select.Also can carry out low-pass filtering to instantaneous power respectively by first low-pass filter and second low-pass filter earlier, by will be through the filtered instantaneous power of the low-pass filter of selecting as instantaneous power after the effective filter, abandon through the filtered instantaneous power of non-selected low-pass filter, obtain filtering the back instantaneous power.Make embodiments of the invention to realize flexible and changeablely.
Each method embodiment of the present invention all can realize in modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the storer of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium or the like).Equally, storer can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), ROM (read-only memory) (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Embodiment three
Present embodiment relates to a kind of energy pulse output unit.Fig. 7 is the structural representation of this energy pulse output unit.This energy pulse output unit comprises:
First low-pass filter and second low-pass filter are respectively applied for input signal are carried out low-pass filtering.Wherein, the step response time of first low-pass filter is shorter than the step response time of second low-pass filter, second low-pass filter to the attenuation degree of non-direct current low frequency part attenuation degree to non-direct current low frequency part greater than first low-pass filter.
The current effective value computing module is used to calculate the watt current value of the current signal of input.
Select module, be used for watt current value, select instantaneous power is carried out the low-pass filter of low-pass filtering, wherein, prescribe a time limit greater than preset gate, select first low-pass filter when the watt current value of calculating according to the calculating of current effective value computing module.When the watt current value of calculating is less than or equal to preset gate in limited time, select second low-pass filter.The current value that this presets thresholding can use according to electric energy meter typical case the time obtains, as the current value when be electric energy meter typical case application 5%, also can be a fixed value.
The numerical frequency converter is used for according to filter back instantaneous power, and the output energy pulse wherein, is filtered the back instantaneous power for after with the low-pass filter of selecting module to select instantaneous power being carried out low-pass filtering, instantaneous power after the filter that obtains.
Specifically, the current effective value computing module can be according to formula
Calculate watt current value I
Rms, wherein, N indication cycle sampling number, i are represented the digital signal that is converted to of current signal by input.
Select module by after first low-pass filter and second low-pass filter carry out low-pass filtering to instantaneous power respectively, to be sent to the numerical frequency converter as instantaneous power after effectively filtering through the filtered instantaneous power of the low-pass filter of selecting, abandon through the filtered instantaneous power of non-selected low-pass filter, obtain waiting being input to instantaneous power after the filter of numerical frequency converter.In the present embodiment, the amplitude-frequency response characteristic of first low-pass filter | H
LPF1(f) | for:
The amplitude-frequency response characteristic of second low-pass filter | H
LPF2(f) | for:
Wherein, f represents frequency variable.
Be not difficult to find that first embodiment is and the corresponding method embodiment of present embodiment, present embodiment can with first embodiment enforcement of working in coordination.The correlation technique details of mentioning among first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable among first embodiment.
Embodiment four
Present embodiment relates to a kind of energy pulse output unit.The 4th embodiment and the 3rd embodiment are basic identical, difference mainly is: in the 3rd embodiment, select module by after first low-pass filter and second low-pass filter carry out low-pass filtering to instantaneous power respectively, will be through the filtered instantaneous power of the low-pass filter of selecting as instantaneous power after effectively filtering, abandon through the filtered instantaneous power of non-selected low-pass filter, obtain waiting being input to instantaneous power after the filter of numerical frequency converter.
Yet in the 4th embodiment, select module select instantaneous power carried out the low-pass filter of low-pass filtering after, the low-pass filter that enables to select, remove to enable non-selected low-pass filter, and the low-pass filter that indication enables carries out low-pass filtering to instantaneous power, obtain waiting being input to instantaneous power after the filter of numerical frequency converter, as shown in Figure 8.
Be not difficult to find that second embodiment is and the corresponding method embodiment of present embodiment, present embodiment can with second embodiment enforcement of working in coordination.The correlation technique details of mentioning among second embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable among second embodiment.
Embodiment five
Present embodiment relates to a kind of electric energy meter, and the electric energy meter in the present embodiment comprises the energy pulse output unit in the foregoing description three, perhaps, comprises the energy pulse output unit in the foregoing description four.
Need to prove, each unit of mentioning in each apparatus embodiments of the present invention all is a logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical matters proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each apparatus embodiments of the present invention will not introduced not too close unit with solving technical matters relation proposed by the invention, and this does not show that there is not other unit in the said equipment embodiment.
Though by with reference to some preferred embodiment of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (13)
1. the energy pulse output intent of an electric energy meter is characterized in that, comprises following steps:
Select corresponding low-pass filter that instantaneous power is carried out filtering according to the watt current value of the current signal of importing, afterwards according to filtered filter back instantaneous power, output energy pulse;
The step response time of the low-pass filter of selecting in limited time greater than preset gate when effective current value is shorter than the step response time that watt current value is less than or equal to the low-pass filter that described preset gate selects in limited time.
2. the energy pulse output intent of electric energy meter according to claim 1 is characterized in that, in the following manner, obtains described filter back instantaneous power:
Enable the low-pass filter of described selection, remove to enable non-selected low-pass filter;
The low-pass filter of selecting carries out low-pass filtering to described instantaneous power after being enabled.
3. the energy pulse output intent of electric energy meter according to claim 1 is characterized in that, in the following manner, obtains described filter back instantaneous power:
The low-pass filter that step response time is short is designated as first low-pass filter, and the low-pass filter that step response time is long is designated as second low-pass filter;
Described first low-pass filter and described second low-pass filter carry out low-pass filtering to described instantaneous power respectively;
To abandon through the filtered instantaneous power of non-selected low-pass filter through the filtered instantaneous power of the low-pass filter of described selection as instantaneous power after effectively filtering.
4. the energy pulse output intent of electric energy meter according to claim 1 is characterized in that, the amplitude-frequency response characteristic of described first low-pass filter | H
LPF1(f) | for:
The amplitude-frequency response characteristic of described second low-pass filter | H
LPF2(f) | for:
Wherein, f represents frequency variable.
5. according to the energy pulse output intent of each described electric energy meter in the claim 1 to 4, it is characterized in that described preset gate is limited to a fixed value or the current value when using according to electric energy meter typical case obtains.
6. the energy pulse output intent of electric energy meter according to claim 5 is characterized in that, 5% of the current value when described preset gate is limited to electric energy meter typical case application.
7. an energy pulse output unit is characterized in that, comprises:
First low-pass filter and second low-pass filter are respectively applied for input signal are carried out low-pass filtering; Wherein, the step response time of described first low-pass filter is shorter than the step response time of described second low-pass filter;
The current effective value computing module is used to calculate the watt current value of the current signal of input;
Select module, be used for watt current value, select instantaneous power is carried out the low-pass filter of low-pass filtering, wherein according to described current effective value computing module calculating, prescribe a time limit greater than preset gate when the described watt current value of calculating, select described first low-pass filter; When the described watt current value of calculating is less than or equal to described preset gate in limited time, select described second low-pass filter;
The numerical frequency converter is used for exporting energy pulse according to filtering the back instantaneous power, and wherein, described filter back instantaneous power is after with the low-pass filter that described selection module is selected instantaneous power being carried out low-pass filtering, instantaneous power after the filter that obtains.
8. energy pulse output unit according to claim 7, it is characterized in that, described selection module also be used for select instantaneous power carried out the low-pass filter of low-pass filtering after, enable the low-pass filter of described selection, remove to enable non-selected low-pass filter, and the low-pass filter that indication enables carries out low-pass filtering to described instantaneous power.
9. energy pulse output unit according to claim 7, it is characterized in that, described selection module also is used for after described first low-pass filter and described second low-pass filter carry out low-pass filtering to instantaneous power respectively, to be sent to described numerical frequency converter as instantaneous power after effectively filtering through the filtered instantaneous power of the low-pass filter of described selection, abandon through the filtered instantaneous power of non-selected low-pass filter.
10. energy pulse output unit according to claim 7 is characterized in that, the amplitude-frequency response characteristic of described first low-pass filter | H
LPF1(f) | for:
The amplitude-frequency response characteristic of described second low-pass filter | H
LPF2(f) | for:
Wherein, f represents frequency variable.
11., it is characterized in that described preset gate is limited to a fixed value or the current value when using according to electric energy meter typical case obtains according to each described energy pulse output unit in the claim 7 to 10.
12. energy pulse output unit according to claim 11 is characterized in that, 5% of the current value when described preset gate is limited to electric energy meter typical case application.
13. an electric energy meter is characterized in that, described electric energy meter comprises each described energy pulse output unit in the claim 7 to 10.
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| CN102721862A (en) * | 2012-05-22 | 2012-10-10 | 钜泉光电科技(上海)股份有限公司 | Method for reducing electric energy pulse jitter |
| CN106896264A (en) * | 2015-12-17 | 2017-06-27 | 上海贝岭股份有限公司 | Reduction for electric energy meter is made an uproar bottom device and method |
| CN110365245A (en) * | 2018-03-26 | 2019-10-22 | 中车株洲电力机车研究所有限公司 | A kind of SVPWM control method, system and the device of deadband eliminating effect |
| CN111181428A (en) * | 2020-01-15 | 2020-05-19 | 燕山大学 | Zero dynamic direct current output voltage control method and system of current source converter |
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