CN101089631A - Electric energy meter using non-distorted wave form - Google Patents
Electric energy meter using non-distorted wave form Download PDFInfo
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- CN101089631A CN101089631A CN 200710043978 CN200710043978A CN101089631A CN 101089631 A CN101089631 A CN 101089631A CN 200710043978 CN200710043978 CN 200710043978 CN 200710043978 A CN200710043978 A CN 200710043978A CN 101089631 A CN101089631 A CN 101089631A
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Abstract
An electric energy meter utilizing non-distortion waveform consists of a signal output unit for outputting relevant current, multiple signal regulation unit for regulating signal outputted from signal output unit, sampling unit for carrying out sampling separately on multiple regulated signal, selection unit for selecting out one signal from signals sampled by sampling unit and operation unit for making calculation on signal selected out by selection unit.
Description
Technical field
What the present invention relates to is a kind of ammeter of technical field of electric appliances, particularly a kind of electric energy meter that utilizes non-distorted wave form.
Background technology
Instrument and equipments such as a plurality of air-conditioning equipments, light fixture generally all are installed in the buildings such as mansion, dwelling house.Electric power or the electric weight spent to these instrument and equipments measure, and will use electric energy meter usually.
More existing electric energy meters be by amplify, the signal of the relevant curtage of sampling and through computing with metering electric weight summation.Electric energy meter shown in Japanese kokai publication hei 5-180874 " measurement range automatic switching control equipment ", TOHKEMY 2002-116052 " measurement mechanism " generally includes: amplifying circuit is used to amplify the coherent signal of input voltage or electric current; Commutation circuit is used for switching magnification according to the coherent signal of input voltage or electric current.Because switches such as employing relay are done commutation circuit, in use need to consider the permanance of switches such as relay itself, i.e. the life-span of switch at the electric energy meter shown in the above-mentioned prior art.And, switch magnification with switch, just be subjected to the influence of switching time, the signal that has been exaggerated sometimes can produce wave form distortion.Adopt the signal that wave form distortion takes place to carry out computing and will produce error, thereby cause the measuring accuracy of electric energy meter to reduce.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of electric energy meter that utilizes non-distorted wave form is provided.The present invention does not need change-over switch etc. to be used for switching the switching device shifter of magnification, does not need to consider the permanance of switching device shifter or the factors such as switching time of magnification.Therefore, can use non-distorted wave form to carry out computing.
The present invention is achieved by the following technical solutions:
The present invention includes: signal efferent, a plurality of signal condition portion, sampling portion, selection portion, operational part.This signal efferent is used to export the signal of relevant curtage.This a plurality of signal condition portion has different magnification mutually, is used to nurse one's health the signal by above-mentioned signal efferent output.This sampling portion samples respectively to the modulated reason signal after the conditioning of above-mentioned a plurality of signal condition portion.This selection portion, it is from choosing one of them signal through the signal of above-mentioned sampling portion sampling.This operational part, the signal that utilization is chosen by above-mentioned selection portion carries out computing.
In the present invention, be input to the signal of each signal condition portion, amplify, after the conditioning, be sampled through different magnifications from a signal efferent.Then, selection portion is chosen one of them signal from be sampled signal, and the signal that this is selected is used in the operational part computing.
Described sampling portion is at least one A/D converter, and its signal after to conditioning is sampled respectively and the A/D conversion.
When described sampling portion was an A/D converter, described electric energy meter also comprised the time interval controls device.In the time interval of time interval controls device control A/D conversion, make a described A/D converter carry out the A/D conversion to the signal after nursing one's health in the different moment.
When the signal after a plurality of conditionings of a plurality of signal condition portion output, when being imported a described A/D converter simultaneously and being carried out the A/D conversion, for example the signal after the conditioning between clash sometimes.But, the A/D converter in this electric energy meter, respectively the mutually different moment to conditioning each signal implement A/D conversion.Therefore, even have only an A/D conversion equipment, also can avoid signal between conflict.
Described selection portion is based on the size of judging through at least one signal of sampling portion sampling by the signal of described signal efferent output, according to its judged result definite signal that will choose from be sampled signal.
For example, when its size of signal from a signal efferent output changed suddenly, this electric energy meter determined to choose the signal through which magnification conditioning and sampling according to the size of each signal constantly of exporting from this signal efferent.Therefore, no matter how the size of signal changes, electric energy meter can both use the signal through suitable magnification conditioning to carry out the higher computing of precision.
Described selection portion is sampled signal with at least one and compares with defined threshold, chooses signal according to its comparative result.
Which in the present invention, even sudden variation takes place,, still can determine to choose through the magnification conditioning and the signal of sampling according to the comparative result that is sampled signal and defined threshold by the size of the signal of sensor output.Therefore, electric energy meter can use the signal through suitable magnification conditioning to carry out precision computing preferably.
Described signal condition portion comprises the first signal condition portion and the bigger secondary signal conditioning portion of gain magnification that the gain magnification is less.This selection portion will compare through first sampled signal values and the defined threshold that the described first signal condition portion nurses one's health.Its result when described first sampled signal values is outside the defined threshold scope, selects described first sampled signal; When described first sampled signal values is in described defined threshold, select to nurse one's health second sampled signal by secondary signal conditioning portion.
In the present invention, be benchmark with first signal after the less first signal condition portion conditioning of magnification, carry out signal and select.Therefore, electric energy meter can easily be judged and should choose in first signal or the secondary signal which.
When selection portion was chosen secondary signal, the operational part utilization be multiply by the secondary signal that obtains after the secondary signal with the ratio of the magnification of the magnification of the first signal condition portion and secondary signal conditioning portion and is carried out computing.
So, when the secondary signal value through the bigger secondary signal conditioning portion conditioning of magnification was used to computing, this secondary signal was just applied to computing after being nursed one's health in conjunction with the magnification of the first signal condition portion.Therefore, though the magnification of the magnification of the first signal condition portion and secondary signal conditioning portion between have difference, this electric energy meter also can reduce the influence that this magnification difference produces operation result.
The invention effect: the present invention does not just need to consider the permanance of switching device shifter or the switching time of magnification owing to do not need switch etc. to be used to switch the switching device shifter of magnification.Therefore, this electric energy meter can use non-distorted wave form to carry out computing.Even only use an A/D conversion equipment, also can avoid signal between conflict.No matter how to change, can both use the signal value after suitable magnification conditioning to carry out precision computing preferably from each its size of signal constantly of a signal efferent output.Can use the signal after suitable magnification conditioning to carry out precision computing preferably.Can easily judge and to choose in first signal or the secondary signal which.Even have difference between the magnification of the magnification of the first signal condition portion and secondary signal conditioning portion, this electric energy meter also can reduce the influence that this magnification difference produces operation result.
Description of drawings
Fig. 1 is the electric energy meter module figure in the present embodiment.
Fig. 2 is the sensor configuration figure of electric energy meter in the present embodiment.
Fig. 3 is the circuit diagram of the signal condition portion of electric energy meter in the present embodiment.
Fig. 4 is the operation workflow figure of electric energy meter in the present embodiment.
Fig. 5 is the waveform synoptic diagram that is input to the signal S of signal condition portion.
Fig. 6 is the waveform synoptic diagram of signal SA, SB after the conditioning of signal condition portion.
Fig. 7 is the partial enlarged drawing of signal SA, SB among Fig. 6.
In the accompanying drawing: 1-electric energy meter, 2-sensor, 2a, 2c, 2e-CT, 2b, 2d, 2f-VT, 3a, 3b-signal condition portion, 4-A/D converter, the 5-control part, 5a-selection portion, 5b-operational part, 5c-time interval controls portion, the 5d-storer, 11-main part, R1a, R1b, R2a, R2b-resistor, OPa, OPb-operational amplifier, the Vref-reference voltage.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
(1) constitutes
Fig. 1 is the module map of electric energy meter 1 in the present embodiment.This electric energy meter 1 is used to measure spent electric power or the electric weight of instrument and equipment (not shown) such as air-conditioning equipment, light fixture, is configured in usually near the electric power electric system as the metering object.This electric system comprises instrument and equipment and the switchboard (not shown) that is connected with instrument and equipment etc.
As shown in Figure 1, the electric energy meter in the present embodiment 1 mainly is made of sensor 2 (being equivalent to the signal efferent) and main part 11.Below, will each component part of electric energy meter 1 be elaborated.
(sensor)
In addition, being arranged at the number of the sensor 2 in the electric energy meter 1, is that the formation of different electric power such as single-phase-two-wire or phase three-wire three decides according to the metering object.Fig. 2 represents sensor and the electric system of conduct metering object and the method for attachment of sensor.Among Fig. 2, channel C h1 is connected to single-phase-two-wire electric system L1, and channel C h2, Ch3 are connected to phase three-wire three electric system L2.Among the electric system L1, CT, a VT (specifically, i.e. CT2a and VT2b) respectively are installed, and among the electric system L2 as sensor 2, as sensor 2 respectively be equipped with two CT, VT (specifically, i.e. CT2c, CT2e and VT2d, VT2f).Then, for example use the CT2a among the electric system L1, detect mutually and flow through in the mutually electric current of R phase of N, with the voltage difference between VT2b detection R-N phase at R.And when selecting CT for use as sensor 2, sensor 2 detects and output currents, is converted to the correspondent voltage value through the electric current that detects through not shown resistor etc., is imported into the signal condition 3a of portion described later, 3b respectively.
As mentioned above, according to the formation of electric system, the sensor 2 of different numbers is set in the electric energy meter 1.Owing to the inside formation of each main part 11 that is connected to sensor 2 is identical, in the present embodiment, be example with the situation that a sensor 2 is installed, the inner structure of the main part 11 that is connected with this sensor 2 is described.
(main part)
As shown in Figure 1, main part 11 comprises two 3a of signal condition portion, 3b, A/D converter 4 and control part 5.
(signal condition portion)
The 3a of signal condition portion, 3b are connected to sensor 2 side by side, when the signal from sensor 2 outputs is transfused to wherein, it are nursed one's health.Signal SA, SB after each 3a of signal condition portion, 3b conditioning are imported into the A/D converter 4 that is connected with each 3a of signal condition portion, 3b.
Below, with the concrete formation of the explanation signal condition 3a of portion, 3b.As shown in Figure 3, the 3a of signal condition portion, 3b comprise operational amplifier OPa, OPb respectively, and the magnification of operational amplifier OPa, OPb is different separately.As can be seen from Figure 3, calculate that according to the resistance value of resistor R 1a and R2a operational amplifier OPa has about 2 times magnification.And calculate that according to the resistance value of resistor R 1b and R2b operational amplifier OPb has about 20 times magnification.To the plus end input reference voltage Vref (being offset voltage) of each operational amplifier OPa, OPb, import signal S by resistor R 1a or R1b respectively to its negative terminal again from sensor 2.This operational amplifier OPa, OPb can enlarge the signal S from sensor 2 respectively 2 times and 20 times.
Here, the supply voltage of operational amplifier OPa, OPb and reference voltage V ref need to be determined with reference to the input range of allowing of A/D converter 4.For example, when A/D converter 4 allow input range be 0V～+ during 3V, be+3V that then reference voltage V ref is+1.25V as the supply voltage of operational amplifier OPa, OPb.At this moment, from signal SA, the SB of each operational amplifier OPa, OPb output, be suppressed in as supply voltage+below the 3V, as A/D converter 4 allow input range (be 0V～+ signal in 3V) exports.Therefore, signal SA, the SB from operational amplifier OPa, OPb output can not cause harmful effect to A/D converter 4.
(A/D converter)
As shown in Figure 1, owing to only be provided with an A/D converter 4, it has the corresponding passage of number with the 3a of signal condition portion, 3b at least, to guarantee that signal SA, SB after two 3a of signal condition portion, 3b amplify are imported wherein respectively.A/D converter 4 with official hour at interval to signal SA, SB after amplifying sample respectively, the A/D conversion, thereby signal SA, SB are converted to numeric data SA ', AB ' (i.e. number value).
Numeric data SA ', AB ' after A/D converter 4 is implemented the A/D conversion are output to control part 5, temporarily are kept in the storer 5d (aftermentioned) of control part 5.
(control part)
The micro computer of control part 5 for being constituted by CPU and storer 5d.Control part 5 in the present embodiment is chosen the numeric data that is used to calculate electric power or electric weight, and is utilized selected numeric data to carry out computing from the numeric data SA ', the SB ' that are converted to digital value through A/D converter 4.In the process of carrying out these actions, control part 5 plays the function of selection portion 5a, operational part 5b, the 5c of time interval controls portion.
(selection portion)
Below, how the selection portion 5a that describes in detail in the present embodiment is selected numeric data SA ' or numeric data SB '.Selection portion 5a, value and the defined threshold of the numeric data SA ' (being equivalent to first signal) that will amplify through the less 3a of signal condition portion of magnification (being equivalent to the first signal condition portion) compare.When relatively result is, the value of numeric data SA ' is during more than or equal to defined threshold, and selection portion 5a chooses numeric data SA '.And as result relatively be, the value of numeric data SA ' is during less than defined threshold, and selection portion 5a chooses the numeric data SB ' (being equivalent to secondary signal) that amplifies through the big 3b of signal condition portion of magnification.
For example, the scope of supposing the signal S before the 3a of signal condition portion, 3b amplify for-0.6V～+ 0.6V (referring to Fig. 5), defined threshold is+1.37V and+1.13V.The 3a of signal condition portion, 3b, signal S can be amplified to original about 2 times and 20 times respectively, but when side-play amount be+1.25V (that is, the 0V that is equivalent to signal S be+1.25V) time, signal SA, SB after the amplification, that its magnitude range is is about 0～+ 2.5V (referring to Fig. 6).And, since the size of signal SA, SB after amplifying be 0～+ 2.5V, the scope of numeric data SA ', AB ' after the A/D conversion also is 0～+ 2.5V.At this moment, if the value of numeric data SA ' more than or equal to+1.37 V, then the size of selection portion 5a decision signal S is pact+0.06V, chooses the numeric data SA ' that amplifies and carry out the A/D conversion through the less 3a of signal condition portion of magnification immediately.If the value of numeric data SA ' is less than+1.37V and more than or equal to+1.13V, then the size of selection portion 5a decision signal S pact+0.06V～-the 0.06V scope in, choose the numeric data SB ' that amplifies and carry out the A/D conversion through the bigger 3b of signal condition portion of magnification immediately.And if the value of numeric data SA ' is less than+1.13V, then the size of selection portion 5a decision signal S is less than-0.06V, chooses numeric data SA ' immediately.
(operational part)
At this, obtain signal SA, SB after by the 3a of signal condition portion, 3b signal S being amplified 2 times or 20 times, again signal SA, SB are carried out the numeric data SA ', the SB ' that obtain after the A/D conversion.Therefore, if the numeric data that selection portion 5a is chosen is directly used in computing, be numeric data SA ' or numeric data SB ' according to what choose so, will produce different operation results.And in the present embodiment, when operational part 5b chooses numeric data SB ' after the bigger 3b of signal condition portion of magnification amplifies, actual carry out power or electric weight computing before, at first the ratio with the magnification of the magnification of the 3a of signal condition portion and the 3b of signal condition portion multiply by numeric data SB '.Then, the numeric data SB ' that obtains after operational part 5b utilization is multiplied each other carries out power or electric weight computing.Specifically, because the magnification of the 3a of signal condition portion, 3b is respectively 2 times and 20 times, when operational part 5b chooses numeric data SB ' time, 10 minutes of utilization numeric data SB ' one numerical value carries out computing.And choosing numeric data SA ' time when it, operational part 5b then is directly used in computing with numeric data SA '.So, even there is difference in the magnification of the 3a of signal condition portion, 3b, can prevent that also its difference from exerting an influence to operation result (being power or electric weight).
(time interval controls portion)
The 5c of time interval controls portion controls sampling interval in the A/D converter 4 (being sample frequency) etc.For example, the 5c of time interval controls portion determines sampling interval, as shown in Figure 7 so that each signal SA, SB are sampled respectively every 100 μ sec.Fig. 7 is the partial enlarged drawing of signal SA, SB, and stain is wherein represented the sampling instant of A/D converter 4.
In addition, the time interval of the 5c of time interval controls portion control sampling so that A/D converter 4 the different moment to signal SA, the SB sampling after amplifying through each 3a of signal condition portion, 3b and implement the A/D conversion.For example, as shown in Figure 7, the sampling instant of the 5c of time interval controls portion control A/D converter 4 is so that it is sampled to signal SA and through behind the 2 μ sec, signal SB is sampled again.
Here, the simple declaration control of the 5c of time interval controls portion enforcement once is so that the reason that A/D converter 4 is sampled to signal SA, SB constantly in difference.In the present embodiment, as shown in Figure 3, have only an A/D converter 4, have two signal SA, SB to be imported in this A/D converter 4.Like this when a plurality of signals are imported in the A/D converter 4, be imported into a plurality of signals in the A/D converter 4 between clash sometimes unavoidably.For this reason, in the present embodiment, the 5c of time interval controls portion will be staggered to sampling and the A/D conversion of each signal SA, SB constantly.Even thereby under the situation of only using an A/D converter 4, a plurality of signals sampling and A/D conversion is not clashed.
(storer)
(2) (action)
Below with reference to Fig. 4～Fig. 7, the action of the related electric energy meter of present embodiment 1 is described.Fig. 4 is the action flow chart of electric energy meter 1.Fig. 5 is the waveform synoptic diagram of signal S that is input to each 3a of signal condition portion, 3b of electric energy meter 1, its transverse axis express time (sec), and the longitudinal axis is represented voltage (V).Fig. 6 represents the signal SA after each 3a of signal condition portion, 3b amplify, the waveform of SB.Below, will be that CT and the example when being connected to single-phase-two-wire electric system L1 describe with sensor 2.
Step S1: the flow through electric current of electric system L1 of 2 pairs of sensors detects.Through sensor 2 detected signal S, after not shown resistor etc. is converted to voltage (referring to Fig. 5), continuously be input to the 3a of signal condition portion, 3b in the main part 11.Here, as shown in Figure 5, signal S becomes-0.6V～+ signal in the 0.6V scope.In addition, sensor 2 is pressed the zero passage of input signal to interrupt with detection and is trigger pulse, carries out current detecting repeatedly.
Step S2: signal S is amplified back (signal SA, SB among Fig. 6) by the magnification of the 3a of signal condition portion, 3b (promptly 2 times and 20 times), is input to A/D converter 4.So, signal SA, SB all be converted into 0～+ numeric data SA ', the SB ' of 2.5V scope.Here, the 5c of the time interval controls portion control A/D converter 4 in the control part 5, so that the signal SA, the SB that are input in the A/D converter 4 are sampled the conversion with A/D with for example mistiming of 2 μ sec, and each signal SA, SB are sampled every 100 μ sec.Like this, as shown in Figure 7, A/D converter 4 the signal SA that is transfused to is sampled and 2 μ sec of A/D conversion after, again signal SB is sampled and the A/D conversion.Every 100 μ sec, A/D converter 4 promptly carries out once above-mentioned action.After each action, numeric data SA ', SB ' after the A/D conversion are stored in respectively in the corresponding memory 5d.
Step S3～S6: when storer 5d internal memory contains numeric data SA ' more than the one-period (S3), selection portion 5a compares (S4) with each value and the defined threshold of numeric data SA '.When the value of numeric data SA ' not +1.13V～+ the 1.37V scope in the time (NO of S4), selection portion 5a chooses numeric data SA ', operational part 5b utilization numeric data SA ' carries out computing (beyond the arrow interval of S5, Fig. 6).And when the value of numeric data SA '+1.13V～+ the 1.37V scope in the time (YES of S4), selection portion 5a chooses numeric data SB ' (the arrow interval of Fig. 6).After, 1/10th values of operational part 5b utilization numeric data SB ' are carried out computing (S6).
(3) effect
(A) according to the electric energy meter in the present embodiment 1, be input to the signal S of each 3a of signal condition portion, 3b from a sensor 2, after being amplified by the magnification of the 3a of signal condition portion, 3b respectively, be sampled with A/D and change.Then, selected 5a of one of numeric data SA ', SB ' after the A/D conversion chooses, and the numeric data that is selected is applied to operational part 5b computing.As mentioned above,, do not need switch etc. to be used for switching the switching device shifter of magnification according to this electric energy meter 1, thereby, do not need to consider the permanance of switching device shifter or the factors such as switching time of magnification.Therefore, this electric energy meter 1 can carry out computing with distortionless waveform.
(B) electric energy meter in the present embodiment 1 has an A/D converter 4.When signal SA, SB after amplifying from the 3a of signal condition portion, 3b output are imported a described A/D converter 4 simultaneously and carry out the A/D conversion, for example clash sometimes between signal SA, the SB.But the A/D converter 4 in this electric energy meter 1 carries out the A/D conversion in the different moment to each signal SA, SB after amplifying respectively.Therefore, even have only an A/D converter 4, also can avoid the conflict between the signal.
(C) according to the electric energy meter in the present embodiment 1, even undergo mutation from the size of the signal S of a sensor 2 output, also can be according to the size of each signal S constantly, determine to select to amplify and numeric data SA ', the SB ' of sampling through which magnification.Especially, electric energy meter 1 determines to choose numeric data SA ' or SB ' according to numeric data SA ' with the comparative result of defined threshold.Therefore, even sensor 2 detected curtages for example take place sudden variation etc. takes place to be caused each signal magnitude difference constantly, also can not produce so-called saturated (being the saturated of numeric data), electric energy meter 1 can both use the signal after suitable magnification conditioning to carry out the higher computing of precision.
(D) in addition, the electric energy meter 1 in the present embodiment will compare with defined threshold through the numeric data SA ' of the less 3a of signal condition portion of magnification conditioning, as numeric data SA ' during more than or equal to defined threshold, chooses numeric data SA '.And, select the numeric data SB ' after magnification is greater than the 3b of the signal condition portion conditioning of the 3a of signal condition portion as numeric data SA ' during less than described defined threshold.Like this, by will being that benchmark carries out signal and selects through first signal of the less first signal condition portion of magnification conditioning, electric energy meter 1 can easily be judged and should select in first signal or the secondary signal which.
(E) also have, according to the electric energy meter in the present embodiment 1, during numeric data SB ' after the elected magnification of learning from else's experience amplifies greater than the 3b of signal condition portion of the 3a of signal condition portion, the ratio of the magnification of the magnification of the 3a of signal condition portion and the 3b of signal condition portion be multiply by numeric data SB ', and the result after will multiplying each other is used for computing.Therefore, though the magnification of the magnification of the 3a of signal condition portion and the 3b of signal condition portion between have difference, electric energy meter 1 also can reduce the influence that this magnification difference produces operation result.
＜other embodiment 〉
(a) in the above-described embodiments, as Fig. 1 and shown in Figure 3, the situation that electric energy meter 1 is provided with two 3a of signal condition portion, 3b is illustrated, and signal condition portion quantity set in the electric energy meter of the present invention is not limited to two, and plural signal condition portion can be set.At this moment, as shown in Figure 1, each signal condition portion is connected to respectively on the sensor side by side.Then, a plurality of signals after each signal condition portion conditioning are imported in the A/D converter, are changed by A/D after sampling.And same with the foregoing description, A/D converter is implemented sampling to each signal constantly in difference.
(b) in the foregoing description, will compare with defined threshold through the numeric data SA ' after the less 3a of signal condition portion of magnification amplifies, be illustrated to determine the numeric data that will choose, the present invention is not limited to this.For example, selection portion 5a can not choose numeric data SA ', and the numeric data SB ' that will obtain after the bigger 3b of signal condition portion of magnification amplifies compares one by one with defined threshold, with the numeric data that determines to choose.At this moment, if numeric data SB ' less than defined threshold, selection portion 5a chooses numeric data SB ', and if numeric data SB ' more than or equal to defined threshold, then selection portion 5a chooses numeric data SA '.
In addition, selection portion 5a can also both all compare one by one with defined threshold with numeric data SA ' and numeric data SB ', select to be used for the numeric data of computing according to its comparative result.
The present invention does not need to be provided with and is used for the devices such as switch of switching signal conditioning portion magnification, even sudden variation takes place input signal wherein, still can carry out the high computing of precision to non-distorted wave form.Therefore, the electric energy meter that the present invention relates to can be used as the electric energy meter use that sudden variation takes place its input signal sometimes.
Claims (7)
1, a kind of electric energy meter (1) is characterized in that, comprising:
A signal efferent (2) is used to export the signal of relevant curtage;
(3a 3b), is used for the signal (S) of conditioning from a described signal efferent (2) output, and (3a 3b) has different gain magnifications separately in wherein said a plurality of signal condition portion in a plurality of signal condition portion;
Sampling portion (4), its to through a plurality of signal condition portion (3a, 3b) (SA's signal after Tiao Li a plurality of conditionings SB) samples respectively;
Selection portion (5a) is from selecting one of them signal in the signal of described sampling portion (4) sampling (SA ', SB ');
Operational part (5b) carries out computing to the signal of being chosen by described selection portion (5a).
2, electric energy meter as claimed in claim 1 (1) is characterized in that:
Described sampling portion (4) is at least one A/D converter, and (SA's its signal after to described conditioning SB) samples respectively and the A/D conversion.
3, electric energy meter as claimed in claim 2 (1) is characterized in that:
When described sampling portion (4) was an A/D converter, described electric energy meter (1) also comprised time interval controls device (5c);
Described time interval controls device (5c) is used to control the time interval of described A/D conversion, and (SA SB) carries out the A/D conversion to a described A/D converter at the signal of the different moment after to described conditioning.
4, as any one described electric energy meter (1) in the claim 1 to 3, it is characterized in that:
Described selection portion (5a) based on through at least one signal of described sampling portion (4) sampling (SA ', SB ') judgement is by the size of the signal (S) of a described signal efferent (2) output, determine the signal that to choose according to its judged result in the signal (SA ', SB ') from described being sampled.
5, electric energy meter as claimed in claim 4 (1) is characterized in that:
Described selection portion (5a) is compared at least one described signal (SA ', SB ') that is sampled with a defined threshold, choose signal according to its comparative result.
6, electric energy meter as claimed in claim 5 (1) is characterized in that:
(3a 3b) comprises the first signal condition portion (3a) that the gain magnification is less and the bigger secondary signal conditioning portion (3b) of magnification of gaining in described signal condition portion;
Described selection portion (5a) is arranged to,
To nurse one's health and compare through the described first signal condition portion (3a) by first sampled signal (SA ') value and defined threshold that described sampling portion (4) samples, when described first sampled signal (SA ') value is outside the defined threshold scope, select described first sampled signal (SA ');
When described first sampled signal (S A ') value is in described defined threshold scope, select second sampled signal (SB ') of nursing one's health and sampling by described sampling portion (4) by secondary signal conditioning portion (3b).
7, electric energy meter as claimed in claim 6 (1) is characterized in that:
When described selection portion (5a) is selected described secondary signal (SB '), described operational part (5b) multiply by described secondary signal value (SB ') with the ratio of the magnification of the magnification of the described first signal condition portion (3a) and described secondary signal conditioning portion (3b), carries out computing to multiply by the resulting described secondary signal of described ratio (SB ') then.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710043978 CN101089631A (en) | 2007-07-19 | 2007-07-19 | Electric energy meter using non-distorted wave form |
| JP2008010541A JP2009025285A (en) | 2007-07-19 | 2008-01-21 | Wattmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710043978 CN101089631A (en) | 2007-07-19 | 2007-07-19 | Electric energy meter using non-distorted wave form |
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| CN101089631A true CN101089631A (en) | 2007-12-19 |
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| CN 200710043978 Pending CN101089631A (en) | 2007-07-19 | 2007-07-19 | Electric energy meter using non-distorted wave form |
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| CN (1) | CN101089631A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102262172A (en) * | 2010-05-31 | 2011-11-30 | 西门子公司 | Power monitoring method and device |
| CN103017940A (en) * | 2012-12-21 | 2013-04-03 | 武汉烽火富华电气有限责任公司 | Passive wireless sound surface wave temperature sensor saturation detecting and adjusting method |
| CN108226630A (en) * | 2016-12-22 | 2018-06-29 | 成都长城开发科技有限公司 | The switching method of the reference voltage of intelligent electric meter |
| CN111307180A (en) * | 2020-04-14 | 2020-06-19 | 国网河南省电力公司信息通信公司 | Method for reducing power supply noise of optical balance receiver for optical cable detection |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09184858A (en) * | 1995-12-28 | 1997-07-15 | Sharp Corp | Voltage-detecting apparatus |
| JP3678163B2 (en) * | 2001-04-13 | 2005-08-03 | 株式会社デンソー | Flying capacitor type assembled battery voltage detector |
| JP2003202354A (en) * | 2002-01-07 | 2003-07-18 | Mitsubishi Electric Corp | Electrification-information measuring apparatus |
| JP4499589B2 (en) * | 2005-03-14 | 2010-07-07 | 日置電機株式会社 | Current measuring device and insulation resistance measuring device |
-
2007
- 2007-07-19 CN CN 200710043978 patent/CN101089631A/en active Pending
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2008
- 2008-01-21 JP JP2008010541A patent/JP2009025285A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262172A (en) * | 2010-05-31 | 2011-11-30 | 西门子公司 | Power monitoring method and device |
| CN102262172B (en) * | 2010-05-31 | 2014-06-18 | 西门子公司 | Power monitoring method and device |
| CN103017940A (en) * | 2012-12-21 | 2013-04-03 | 武汉烽火富华电气有限责任公司 | Passive wireless sound surface wave temperature sensor saturation detecting and adjusting method |
| CN103017940B (en) * | 2012-12-21 | 2014-11-12 | 武汉烽火富华电气有限责任公司 | Passive wireless sound surface wave temperature sensor saturation detecting and adjusting method |
| CN108226630A (en) * | 2016-12-22 | 2018-06-29 | 成都长城开发科技有限公司 | The switching method of the reference voltage of intelligent electric meter |
| CN108226630B (en) * | 2016-12-22 | 2020-07-31 | 成都长城开发科技有限公司 | Switching method of reference voltage of intelligent electric meter |
| CN111307180A (en) * | 2020-04-14 | 2020-06-19 | 国网河南省电力公司信息通信公司 | Method for reducing power supply noise of optical balance receiver for optical cable detection |
| CN111307180B (en) * | 2020-04-14 | 2021-10-15 | 国网河南省电力公司信息通信公司 | Method for reducing power supply noise of optical balance receiver for optical cable detection |
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