CN103460060A - Power measurement device - Google Patents
Power measurement device Download PDFInfo
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- CN103460060A CN103460060A CN201280016635XA CN201280016635A CN103460060A CN 103460060 A CN103460060 A CN 103460060A CN 201280016635X A CN201280016635X A CN 201280016635XA CN 201280016635 A CN201280016635 A CN 201280016635A CN 103460060 A CN103460060 A CN 103460060A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
Abstract
In the present invention, an AD converter (15) samples voltage and current signals at an AD sampling timing set by a switch control unit (19) and performs AD conversion. When dividing an AD sampling cycle m into n sections, m would be set to 1/4th the power cycle and n is set to 3, for example. In time period A, out of three AD sampling timings, AD conversion is performed at the first timing. In time period B, out of three AD sampling timings, AD conversion is performed at the second timing. Further, in time period C, out of three AD sampling timings, AD conversion is performed at the third timing. Shifting the three AD sampling timings one-by-one enables highly precise detection of power equivalent to a case where sampling is performed at triple the AD sampling frequency.
Description
Technical field
The present invention relates to a kind of signal to voltage and current is sampled and is carried out AD and converted the electric power metering device that electric power is measured.
Background technology
In the past known have following a kind of sampling type ammeter (for example, with reference to patent documentation 1): utilize AD (the Analog Digital: analog digital) transducer that simulating signal is transformed to digital signal, input voltage waveform and input current waveform are sampled, by each sampled result is multiplied each other active power is measured.
With reference to Figure 13 explanation sampling type ammeter in the past.Figure 13 means the block diagram of the inner structure of sampling type ammeter in the past.In sampling type ammeter 110, the analog voltage signal e that is input to input terminal T1 is transformed to digital signal by AD transducer 131.In addition, the analog current signal i that is input to input terminal T2 is transformed to digital signal by AD transducer 132.
Two AD transducers 131,132 will be sampled respectively to analog voltage signal e, analog current signal i with the generation Timing Synchronization ground of this clock signal by the signal of clock generator 113 outputs as common clock signal, are transformed to digital signal.
Thereby, voltage signal e (t), current signal i (t) from 131,132 outputs of two AD transducers as the sampled value of synchronization.Value when in addition, voltage signal e (t), current signal i (t) are discrete moment t.
Like this when each clocking constantly t=t1, t2, the time sampled value combination (e (t1), i (t1)), (e (t2), i (t2)), output to arithmetical unit 111 from two AD transducers 131,132.
Patent documentation 1: Japanese kokai publication hei 04-109173 communique
Yet there are the following problems in above-mentioned electric power metering device in the past.In the electric power computing, in the situation that be taken into the high-frequency signal such as higher hamonic wave, need to shorten the cycle of clock signal according to this frequency content.Therefore, in the electric power computing, sample frequency uprises, and hits increases.
In order to carry out such high-speed sampling, must use high performance equipment for AD transducer and CPU (microcomputer), thereby the manufacturing cost of electric power metering device increases.That is to say, in the situation that form at an easy rate electric power metering device, be difficult to accurately the electric power of high frequency is measured.
Summary of the invention
The present invention, in view of above-mentioned situation in the past completes, provides a kind of AD conversion electric power metering device that also high precision is measured electric power that does not make the hits increase just carry out high-frequency signal.
The electric power metering device of an embodiment of the invention is measured the electric power provided to load from power supply, this electric power metering device possesses: the AD converter unit, and its signal to the voltage and current of the load that is provided above-mentioned electric power is sampled and is carried out the AD conversion; Arithmetic element, its value that will carry out the voltage and current after the AD conversion by above-mentioned AD converter unit multiplies each other computing electric power; And switch unit, its sampling period by above-mentioned AD converter unit, m was divided into the n decile, the m/n of take sets the timing of being sampled as interval, be made as first period during regularly being sampled at first, during being made as n during being sampled n timing, time width is in accordance with regulations switched during to above-mentioned first period～the n, and wherein, above-mentioned AD converter unit is sampled in the timing by during after above-mentioned switch unit switching.
In addition, preferably, any that above-mentioned arithmetic element is used in the voltage and current of computing electric power sampled during be at least afore mentioned rules time width n doubly during.
In addition, preferably, the time width of afore mentioned rules is the natural several times of power cycle.
In addition, preferably, above-mentioned switch unit during the order with regulation is switched above-mentioned first period～the n after, in upper order during once making to switch above-mentioned first period～the n for to be switched from last time different orders.
In addition, preferably, above-mentioned switch unit is according to the transfer sequence arrange changed during above-mentioned first period～the n.
In addition, preferably, above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n brokenly.
In addition, preferably, said n is 2.
In addition, preferably, during the time width of afore mentioned rules is the half-wave of each signal of above-mentioned voltage and current.
In addition, preferably, above-mentioned switch unit, with the order of the reversed in order with above-mentioned first period and the second phase having been carried out to switching, is once switched above-mentioned first period and the second phase upper.
In addition, preferably, above-mentioned AD converter unit is that above-mentioned signal is just changing or bearing from forward the zero crossing timing of variation from negative sense by the second time width by the beginning timing adjustment of above-mentioned sampling period m.
In addition, preferably, in the situation that above-mentioned AD converter unit timesharing ground carries out the AD conversion of the signal of above-mentioned voltage and current, above-mentioned switch unit is replaced the order of AD conversion by the 3rd time width, which of above-mentioned voltage and current is first carried out.
In addition, preferably, no matter how supply frequency all is fixed as the number of samples of one-period the number of regulation.
In addition, preferably, being sampled to the signal of the voltage and current of a plurality of loads that electric power is provided by least one power supply in timesharing ground, obtains respectively the electric power that above-mentioned a plurality of loads are provided.
In addition, preferably, when the above-mentioned a plurality of loads of the time width by afore mentioned rules switching are sampled to each signal of above-mentioned voltage and current, above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n for each above-mentioned load.
In addition, preferably, above-mentioned switch unit is pressed the transfer sequence during above-mentioned first period～the n that arranges each above-mentioned load of change.
In addition, preferably, above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n of each above-mentioned load brokenly.
the effect of invention
According to an embodiment of the invention, sampling period m is divided into to the n decile, during time width in accordance with regulations switches first first period～the n n regularly regularly, therefore do not make hits increase the AD that just can carry out high-frequency signal and convert, accurately electric power is measured.
The accompanying drawing explanation
Purpose of the present invention and feature will become clear and definite by the explanation of following apposition accompanying drawing and preferred embodiment.
Fig. 1 means the block diagram of inner structure of the electric power metering device of the first embodiment.
Fig. 2 means the sequential chart for the AD sampling timing of signal waveform.
Fig. 3 means the sequential chart of variation of the zero cross pulse signal of the starting point for adjusting AD sampling period m, (a) is the zero cross pulse signal, is (b) signal of detected object.
Fig. 4 mean regulation during W be half-wave during the sequential chart of AD sampling timing when (power cycle 1/2).
The key diagram that during Fig. 5 explanation regulation, W is the AD sampling timing during half-wave the time, (a) be the key diagram in the situation in 16 sampling/cycles, is (b) key diagram in the situation in 8 sampling/cycles.
The key diagram of the effect when Fig. 6 explanation AD sampling timing during W is half-wave during regulation the time is sampled, (a) be not have the such variation of signal intermittency signal repeatedly during having signal, an ensuing wavelength during a wavelength, (b) first regularly sampled during A and second regularly sampled during the example that switched during by wavelength of B, (c) be during A and during the example that switched by half-wave of B.
Fig. 7 mean by during wavelength to during A and during the sequential chart of the order of the B AD sampling timing while being switched.
Fig. 8 be explanation in the situation that by during wavelength to during A and during the key diagram of the order of the B AD sampling timing while the being switched effect of being sampled, (a) be in positive side and the asymmetric signal waveform of minus side, (b) first regularly sampled during A and second regularly sampled during B by half-wavelength during the example of switching alternately, (c) be by wavelength replace to during A and during the example of the order switched of B.
Fig. 9 means the block diagram of inner structure of the electric power metering device of the second embodiment.
Figure 10 means in the situation that the sequential chart of the AD sampling timing during transfer sequence of voltage and current change AD conversion.
Figure 11 means the key diagram of the AD sampling timing of each circuit.
Figure 12 means the table that changes the combination of the order of switching the AD sampling timing for each circuit.
Figure 13 means the block diagram of the inner structure of sampling type ammeter in the past.
Embodiment
Use accompanying drawing that each embodiment of electric power metering device involved in the present invention is described.In institute's drawings attached, for the additional same reference marker of same or similar part, also description thereof is omitted.The electric power metering device of present embodiment can be applied to sampling type ammeter or multicircuit ammeter.
(the first embodiment)
Fig. 1 means the figure of inner structure of the electric power metering device 1 of the first embodiment.Electric power metering device 1 is the structure that comprises voltage detection department 11, current detecting part 12, signal switching part 13, signal amplifier 14, AD transducer 15, electric power operational part 16, display 17, clock generator 18 and switch control portion 19 as shown in Figure 1.
24 voltages that provide are provided from system power supply 21 to load voltage detection department 11.
24 electric currents that provide are provided from system power supply 21 to load current detecting part 12.
The switching signal that switch control portion 19 will be switched the voltage detection department 11 as detected object and current detecting part 12 outputs to signal switching part 13, in addition to 15 outputs of AD transducer for setting the signal of the timing (AD sampling timing) of being sampled.
In addition, switch control portion 19 is the structures that comprise the 19a of specification of variables section and order configuration part 19b.
Set AD sampling period m, Segmentation Number n, time width W and time width Y in the 19a of specification of variables section.
In the 19b of order configuration part as described later to set different AD sampling timing during order set.
Electric power operational part 16 will carry out the digital value of the current signal that AD conversion obtains and the digital value of voltage signal multiplies each other to calculate instantaneous power value by AD transducer 15, this the instantaneous power value calculated is accumulated and averaged during whole regulation, calculate the active power value.
The active power value that display 17 demonstrations are exported from electric power operational part 16 etc.
In the present embodiment, electric power operational part 16 and switch control portion 19 can consist of less expensive mini-computer.By the input interface in this microcomputer, come the 19a of specification of variables section is set to each above-mentioned value (AD sampling period m, Segmentation Number n, time width W and time width Y).
Fig. 2 means the sequential chart for the AD sampling timing of signal waveform.Carried out the AD sampling timing of AD conversion is set by switch control portion 19 as described above by AD transducer 15.At this, AD sampling period m can be divided into to the n decile, the m/n of take sets the AD sampling timing as interval, as the one example, illustrate be set as the m=power cycle 1/4, the situation of n=3.
In addition, the natural number k that time width (regulation during) W is set to sampling period m doubly.Natural number k times (W=m * k) by time width W being set as to sampling period m, easily carry out the sampling of higher hamonic wave composition.
In addition, Tc during being sampled for the voltage and current to for power value accumulation (computing) some, in the situation that by AD sampling period m be divided into the n decile be time width W at least n doubly during (Tc=W * n).In addition, during power value accumulation period Tt is sampled respectively to voltage and current, therefore be during 2 times (Tt=Tc * 2) of Tc.
In A during time width W (first period), first of first in three AD sampling timing regularly carries out the AD conversion.In B during time width W (second phase), the AD conversion is carried out in the second timing in three AD sampling timing.And, in C during time width W (during n), the 3rd of the 3rd (n) in three AD sampling timing regularly carries out the AD conversion.At this, set the order of AD sampling timing by order configuration part 19b as repeated the first timing, the second timing, the 3rd order regularly.
Like this, by making three AD sampling timing, stagger one by one, can be equal to the situation ground of being sampled with the AD sample frequency of 3 times and detect accurately electric power.
At this, for the starting point of AD sampling period m, use the signal of detected object to be adjusted termly.Fig. 3 means the sequential chart of variation of the zero cross pulse signal of the starting point for adjusting AD sampling period m.It is for example regularly that voltage signal is just changing or crossing zero zero cross point from negative variation of forward from negative sense that the sampling that AD converts starts, and the rising of the zero cross pulse signal switched in H level/L level is regularly adjusted.
(a) of Fig. 3 means the zero cross pulse signal.(b) of Fig. 3 means the signal of detected object.AD transducer 15 is the starting point at the rising timing adjustment AD of zero cross pulse signal sampling period m by time width Y (the second time width), in this AD sampling timing that starts to light from adjusting, carries out the sampling of signal.Like this, by making the AD sampling timing, synchronize with the signal of detected object termly, can adjust accurately the AD sampling timing.
In addition, as described above, in accordance with regulations during W, with the switching of (during A, B, C, X) (during first period～the n) during predefined order is carried out in the 19b of order configuration part, be the switching of different AD sampling timing.
In addition, also can in the 19b of order configuration part, tandom number generator be set, utilize the irregular value (random value) generated by this tandom number generator to carry out the switching of AD sampling timing.Thus, can prevent with load current in such intermittency signal of occurring synchronously sampled, can not relied on the electric-power metering of intermittency signal.
Fig. 4 mean regulation during W be half-wave during the sequential chart of AD sampling timing when (power cycle 1/2).At this, AD sampling period m is power cycle 1/4, and the value of Segmentation Number n is 3.
During the half-wave of positive side, during A first regularly carry out the sampling (double sampling) of 2.During the half-wave of minus side, during B second regularly carry out the sampling (double sampling) of 2.During the half-wave of the positive side of the next one, during C the 3rd regularly carry out the sampling (double sampling) of 2.During the half-wave of next minus side, during A first regularly carry out the sampling (double sampling) of 2.
The key diagram that during Fig. 5 explanation regulation, W is the AD sampling timing during half-wave the time.(a) of Fig. 5 means the key diagram in the situation in 16 sampling/cycles, and (b) of Fig. 5 means the key diagram in the situation in 8 sampling/cycles.
At this, AD sampling period m is power cycle 1/8, and the value of Segmentation Number n is 2.The signal waveform that is thought of as power supply is just (plus) side and negative (minus) side are identical.In this case, as shown in Fig. 5 (b), in positive side, the sampled point of the odd number in 16 samplings of Fig. 5 (a) is sampled, and at minus side, at the sampled point of the even number of Fig. 5 (a), is sampled.
Value in regularly 10 samplings in Fig. 5 (b) is processed in the value identical value that only symbol is contrary of regularly 2 samplings in (a) with Fig. 5.Similarly, the value in regularly 12 samplings in Fig. 5 (b) is processed in the value identical value that only symbol is contrary of regularly 4 samplings in (a) with Fig. 5.
That is to say, when the signal waveform of power supply when just (plus) side is identical with negative (minus) side, therefore can regularly obtain two sampled values at each, even sampled by 8 sampling/cycles, also can access by 16 sampling/cycles such effect of being sampled.
The rectangular area that the sampled point of take in Fig. 5 (a) and Fig. 5 (b) is a summit and be amount proportional to electric power, thus, even 8 sampling/cycles also can access the area identical with 16 sampling/cycles.Therefore, can detect accurately electric power equally.In addition, in the situation that regulation during during W is half-wave, it is easy that the electric power computing becomes.And, because the value of Segmentation Number n is 2, therefore can complete sampling with one-period.
The key diagram that during Fig. 6 explanation regulation, W is the effect when the AD sampling timing is sampled during half-wave the time.(a) of Fig. 6 for example mean load current waveform there being signal during a wavelength, do not have a situation of the such variation of signal intermittency signal repeatedly during next wavelength.
For such intermittency signal, shown in (b) of Fig. 6 first regularly sampled during A and second regularly sampled during the situation switched during by wavelength of B.In this case, signal waveform only during first regularly being sampled of A, during second regularly not sampled of B, so precise decreasing of AD conversion.
In (c) of Fig. 6, during illustrating A and during the situation switched by half-wave of B.In this case, the signal waveform of positive side during first regularly being sampled of A, the signal waveform of minus side during second regularly being sampled of B.
In AC wave shape, a lot of load current waveform is that the waveform of the waveform of positive side and minus side is identical.Thereby, for such load current waveform, by two timings of A, B during in a waveform, sampled, the precision of AD conversion can be improved, and electric power can be detected accurately.
Then, following situation is shown: switch control portion 19 is according to the order of setting in the 19b of order configuration part, will by during wavelength to during A and during the signal that switched of the order of B output to signal switching part 13.Fig. 7 mean by during wavelength to during A and during the sequential chart of the order of the B AD sampling timing while being switched.At this, AD sampling period m is power cycle 1/8, and during during regulation, W is half-wave (power cycle 1/2), the value of Segmentation Number n is 2.
For the signal waveform of positive side (during A), the odd point in 16 samplings of Fig. 5 (a) is sampled.For the signal waveform of minus side (during B), the even number point in 16 samplings of Fig. 5 (a) is sampled.In addition, press during wavelength alternately between transfer period A and during B.
That is, for first the signal waveform of positive side, during first regularly 1,3,5,7 being sampled of A.For the signal waveform of the minus side of second, during second regularly 10,12,14,16 being sampled of B.For the signal waveform of the positive side of the 3rd, during the timing 2,4,6,8 of B sampled.For the signal waveform of the minus side of the 4th, during first regularly 9,11,13,15 being sampled of A.Like this, press during half-wave alternately between transfer period A and during B, carry out 16 samplings by two cycles.
Fig. 8 be explanation by during wavelength to during A and during the key diagram of the order of the B effect when the AD sampling timing is sampled while being switched.(a) of Fig. 8 illustrate in load current waveform occur such in positive side and the asymmetric signal waveform of minus side.
For this asymmetric signal waveform, in (b) of Fig. 8, first regularly sampled during A and second regularly sampled during B alternately switched during by half-wavelength.In this case, the signal waveform of positive side only during first regularly being sampled of A, the signal waveform of minus side only during second regularly being sampled of B.Therefore, the precise decreasing of AD conversion.
In (c) of Fig. 8, by wavelength replace to during A and during the order switched of B.Thus, for the signal waveform of positive side, during first half-wavelength during first regularly being sampled of A, during the 3rd half-wavelength during the second action of regularly being sampled of B similarly repeat.
In addition, for the signal waveform of minus side, during second half-wavelength during second regularly being sampled of B, during the 4th wavelength during the first action of regularly being sampled of A similarly repeat.
Thereby, for positive and negative asymmetric signal waveform, positive side and minus side respectively during two AD sampling timing of A, B sampled, so the precision of AD conversion uprises, and can detect accurately electric power.
Like this, in positive and negative asymmetric signal waveform, also last time and on once between replacement period A and during the order of B, as long as twice of identical waveform is continuously above, just can improve the precision that AD converts thus.
According to the electric power metering device 1 of the first embodiment, for a waveform, by being staggered, the AD sampling timing sampled, even less hits also can detect the higher hamonic wave composition, and can improve the precision of AD conversion.That is to say, do not make the hits increase just can carry out the AD conversion of high-frequency signal, measuring power accurately.
Thereby, even do not improve sample frequency, also can be equal to the electric power computing while making sample frequency become n times.In addition, do not need the microcomputer that arithmetic capability is high, and can carry out computing by mini-computer, cost.
In the first embodiment, illustrated any situation of being sampled in voltage and current, but in fact alternately voltage and current has been sampled to carry out the electric power computing.About this, in ensuing the second embodiment, describe.
(the second embodiment)
In the first embodiment, show the situation of carrying out voltage detecting or current detecting for a system power supply.In the second embodiment, illustrating to exist by least one system power supply provides a plurality of loads (electric loop) of electric power the situation that switching electric loop in timesharing ground carries out electric-power metering.
Fig. 9 means the block diagram of inner structure of the electric power metering device 1a of the second embodiment.For the additional identical Reference numeral of the textural element identical with the first embodiment, the description thereof will be omitted thus.At this, for structure and the action different from the first embodiment, describe.
The electric power metering device 1a of the second embodiment detects a plurality of electric loops (also referred to as circuit) voltage and current separately and asks electric power.
Therefore, be provided with voltage detection department 11a and the current detecting part 12a of the voltage and current that detects respectively the first circuit in electric power metering device 1a.Also be provided with voltage detection department 11b and the current detecting part 12b of the voltage and current that detects respectively second circuit.Similarly, be provided with voltage detection department 11c and the current detecting part 12c of the voltage and current that detects respectively tertiary circuit.At this, although tertiary circuit has been shown, in the situation that exist the 4th later circuit also identical.
In order to detect the voltage and current of each circuit, 33 switchings of signal switching part are as the signal of detected object.
Except similarly setting AD sampling period m, Segmentation Number n, time width W and time width Y with the first embodiment, also set time width Z (the 3rd time width) in the 39a of specification of variables section.
In the 39b of order configuration part, set the AD sampling timing has been carried out setting during (during A, during B, during C, during X) transfer sequence and the transfer sequence of a plurality of circuit.
This transfer sequence can at random be set.By computing used as the number of signals r of a plurality of circuit of switching object and the AD sampling timing is set during the arrangement nPr of number (Segmentation Number n), can access switchable number of cases.Perhaps, also transfer sequence can be set as to the irregular value by the tandom number generator generation.
In addition, with the first embodiment similarly, switch control portion 39 and electric power operational part 16 can consist of mini-computer.By the input interface in this microcomputer, the 39a of specification of variables section is set to each above-mentioned value (except AD sampling period m, Segmentation Number n, time width W and time width Y, also having time width Z (the 3rd time width)).The CPU execution that order configuration part 39b is set by mini-computer is kept at the resulting order of program in ROM.
The sequential chart of some AD sampling timing while first carrying out that Figure 10 means that the transfer sequence of replacing the AD conversion makes voltage and current.The transfer sequence that switch control portion 39 is replaced the AD conversion by time width Z first carries out the some of voltage waveform and current waveform.This time width Z is set to natural number j times of time width W.
Specifically, in initial time width Z, during A first regularly first carry out the AD conversion of voltage waveform, then during the second action of regularly carrying out the AD conversion of current waveform of B repeat.
, through out-of-date the transfer sequence of AD conversion is replaced with and first carries out current waveform as this time width Z.That is to say, in next time width Z, during A first regularly first carry out the AD conversion of current waveform, then during the second action of regularly carrying out the AD conversion of voltage waveform of B repeat.
Like this, by the transfer sequence of replacing the AD conversion, the some of voltage and current first carried out, can access following effect.Because the AD conversion timesharing of the electric current of the object as multiplication and voltage is carried out successively, therefore as these AD conversion mistimings regularly, produce the mistiming (in figure with reference to Δ t) of a few μ sec.But, by the transfer sequence of replacing termly AD conversion, making somely first to carry out, the mistiming of these a few μ sec is cancelled in computing, and the measuring accuracy of electric power improves.
In addition, by setting such transfer sequence or transfer sequence is set as to irregular value according to arranging as described above, can prevent from synchronously being sampled with intermittency signal, can not relied on the electric power computing of intermittency signal.
In addition, the transfer sequence of replacement AD conversion also can similarly be applied some first the carrying out of voltage and current in the first embodiment.
Then, the situation that switch control portion 39 changes the AD sampling timing for each circuit and changes the combination of circuit and AD sampling timing by the time width W is shown.And, change as described above the transfer sequence of the AD conversion of voltage waveform and current waveform in the AD conversion of being undertaken by circuit.That is to say, as described above time width W be sampling period m natural number k doubly, Tc during any of voltage and current for power value accumulation (computing) sampled in the situation that by AD sampling period m be divided into the n decile be time width W n doubly during, power value accumulation period Tt be during 2 times of Tc.At this, when service time during width Z, by electric power accumulation period Tt by time width Z alternately switched voltage and electric current sampled, can more correctly measure power value.
Figure 11 means the key diagram of the AD sampling timing of each circuit.The order of switch control portion 39 to set in the 39b of order configuration part, the circuit that carries out the AD conversion by time width W switching.The situation of commutation circuit 1, circuit 2, circuit 3 these three circuit is shown.
In circuit 1, with during A first regularly, during B second regularly such order carry out the AD conversion.In circuit 2, with during B second regularly, during C the 3rd regularly such order carry out the AD conversion.In circuit 3, with during C the 3rd regularly, during A first regularly such order carry out the AD conversion.
Specifically, illustrate by circuit change A between transfer period first regularly, during B second regularly, during the 3rd situation of the order of these three AD sampling timing regularly of C.
Figure 12 means the table that changes the combination of the order of switching the AD sampling timing by circuit.
In primary time width X, by the time width W, during A switch to circuit 1, during B switch to circuit 2, during C switch to circuit 3, then during B switch to circuit 1, during C switch to circuit 2, during A switch to circuit 3, finally during C switch to circuit 1, during A switch to circuit 2, during B switch to circuit 3.
In secondary time width X, by the time width W, during A switch to circuit 1, during C switch to circuit 2, during B switch to circuit 3, then during C switch to circuit 1, during B switch to circuit 2, during A switch to circuit 3, finally during B switch to circuit 1, during A switch to circuit 2, during C switch to circuit 3.
In time width X for the third time, by the time width W, during B switch to circuit 1, during A switch to circuit 2, during C switch to circuit 3, then during A switch to circuit 1, during C switch to circuit 2, during B switch to circuit 3, finally during C switch to circuit 1, during B switch to circuit 2, during A switch to circuit 3.
Like this, even press the transfer sequence of circuit between conversion period, also can make the AD sampling timing stagger, obtain same effect.
In addition, in the transfer sequence during each circuit, also can in the 39b of order configuration part, set by order or the irregular value of arranging.Thus, can prevent that the intermittency signal such with load current from synchronously being sampled, can not relied on the metering of intermittent current.
According to the electric power metering device 1a of the second embodiment, in the situation that, with a plurality of circuit measuring powers, also can carry out the AD conversion to the such high-frequency signal waveform of higher hamonic wave accurately.
In addition, the invention is not restricted to the structure of above-mentioned embodiment, so long as can reach the structure of the function that the structure of the function shown in claims or present embodiment has, structure whatever can both be applied.
For example also the number of samples of one-period can be fixed as to the number of regulation, for example 8 samplings, 16 samplings, in this case, even supply frequency becomes 50Hz, 55Hz, 60Hz etc., do not need to change the algorithm of computing electric power yet, can easily realize.
In addition, in the above-described embodiment, by an AD transducer timesharing ground, the signal of voltage and current is sampled and carried out the AD conversion, but also can use two AD transducers separately sampled and carry out the AD conversion, by multiplying each other at magnitude of voltage and the current value that sampling obtains in the same time mutually, can eliminate the mistiming.
Above-mentioned all embodiments, the illustrative examples in embodiment and variation can combine mutually carries out.The preferred embodiment of the present invention more than has been described, but has the invention is not restricted to these specific embodiments, can not break away from numerous variations and the distortion of claim category, it also belongs in category of the present invention.
Claims (16)
1. an electric power metering device, it is measured the electric power provided to load from power supply, and this electric power metering device possesses:
The AD converter unit, its signal to the voltage and current of the load that is provided above-mentioned electric power is sampled and is carried out the AD conversion;
Arithmetic element, its value that will carry out the voltage and current after the AD conversion by above-mentioned AD converter unit multiplies each other computing electric power; And
Switch unit, its sampling period by above-mentioned AD converter unit, m was divided into the n decile, the m/n of take sets the timing of being sampled as interval, be made as first period during regularly being sampled at first, during being made as n during being sampled n timing, time width is in accordance with regulations switched during to above-mentioned first period～the n
Wherein, above-mentioned AD converter unit is sampled in the timing by during after the switching of above-mentioned switch unit.
2. electric power metering device according to claim 1, is characterized in that,
Any that above-mentioned arithmetic element is used in the voltage and current of computing electric power sampled during be at least afore mentioned rules time width n doubly during.
3. electric power metering device according to claim 2, is characterized in that,
The time width of afore mentioned rules is the natural several times of power cycle.
4. according to the described electric power metering device of any one in claim 1～3, it is characterized in that,
Above-mentioned switch unit during the order with regulation is switched above-mentioned first period～the n after, in upper order during once making to switch above-mentioned first period～the n for to be switched from last time different orders.
5. electric power metering device according to claim 4, is characterized in that,
Above-mentioned switch unit is according to the transfer sequence arrange changed during above-mentioned first period～the n.
6. electric power metering device according to claim 4, is characterized in that,
Above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n brokenly.
7. electric power metering device according to claim 1, is characterized in that,
Said n is 2.
8. electric power metering device according to claim 1, is characterized in that,
During the time width of afore mentioned rules is the half-wave of each signal of above-mentioned voltage and current.
9. electric power metering device according to claim 7, is characterized in that,
Above-mentioned switch unit, with the order of the reversed in order with above-mentioned first period and the second phase having been carried out to switching, is once switched above-mentioned first period and the second phase upper.
10. according to the described electric power metering device of any one in claim 1～9, it is characterized in that,
Above-mentioned AD converter unit is that above-mentioned signal is just changing or bearing from forward the zero crossing timing of variation from negative sense by the second time width by the beginning timing adjustment of above-mentioned sampling period m.
11. according to the described electric power metering device of any one in claim 1～10, it is characterized in that,
In the situation that above-mentioned AD converter unit timesharing ground carries out the AD conversion of the signal of above-mentioned voltage and current, above-mentioned switch unit is replaced the order of AD conversion by the 3rd time width, which of above-mentioned voltage and current is first carried out.
12. according to the described electric power metering device of any one in claim 1～11, it is characterized in that,
No matter how supply frequency all is fixed as the number of samples of one-period the number of regulation.
13. according to the described electric power metering device of any one in claim 1～12, it is characterized in that,
Being sampled to the signal of the voltage and current of a plurality of loads that electric power is provided by least one power supply in timesharing ground, obtains respectively the electric power that above-mentioned a plurality of loads are provided.
14. electric power metering device according to claim 13, is characterized in that,
When the above-mentioned a plurality of loads of the time width by afore mentioned rules switching are sampled to each signal of above-mentioned voltage and current, above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n for each above-mentioned load.
15. electric power metering device according to claim 14, is characterized in that,
Above-mentioned switch unit is pressed the transfer sequence during above-mentioned first period～the n that arranges each above-mentioned load of change.
16. electric power metering device according to claim 14, is characterized in that,
Above-mentioned switch unit changes the transfer sequence during above-mentioned first period～the n of each above-mentioned load brokenly.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011093600A JP5877350B2 (en) | 2011-04-20 | 2011-04-20 | Power measuring device |
| JP2011-093600 | 2011-04-20 | ||
| PCT/IB2012/000763 WO2012143779A1 (en) | 2011-04-20 | 2012-04-18 | Power measurement device |
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| CN103460060A true CN103460060A (en) | 2013-12-18 |
| CN103460060B CN103460060B (en) | 2016-03-30 |
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| CN201280016635.XA Active CN103460060B (en) | 2011-04-20 | 2012-04-18 | Electric power metering device |
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| JP (1) | JP5877350B2 (en) |
| CN (1) | CN103460060B (en) |
| TW (1) | TWI522627B (en) |
| WO (1) | WO2012143779A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301554A (en) * | 2015-12-03 | 2016-02-03 | 国网重庆市电力公司电力科学研究院 | Electric energy metering loop high precision data synchronous sampling device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5758941B2 (en) * | 2013-03-28 | 2015-08-05 | 三菱電機株式会社 | Measuring device, measuring method, and program |
| WO2014188566A1 (en) | 2013-05-23 | 2014-11-27 | 三菱電機株式会社 | Heat pump device, and air conditioner, heat pump water heater, refrigerator, and freezer comprising same |
| JP6403044B2 (en) * | 2014-04-07 | 2018-10-10 | パナソニックＩｐマネジメント株式会社 | Power meter, power meter for distribution board and distribution board using the same |
| CN104808086B (en) * | 2015-04-29 | 2017-07-28 | 北京荣信慧科科技有限公司 | A kind of AD analog input cards and acquisition method with adaptation function |
| US10615641B2 (en) * | 2017-06-26 | 2020-04-07 | Vutiliti, Inc. | Induction powered electricity current monitoring |
| TWI633313B (en) | 2017-11-09 | 2018-08-21 | 財團法人工業技術研究院 | Power measuring system and power measuring method |
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|---|---|---|---|---|
| JP2000338149A (en) * | 1999-05-31 | 2000-12-08 | Mitsubishi Electric Corp | Electric power measuring device |
| JP2004069466A (en) * | 2002-08-06 | 2004-03-04 | Kyoritsu Electrical Instruments Works Ltd | Electric current measuring device |
| JP2005010151A (en) * | 2003-05-28 | 2005-01-13 | Hioki Ee Corp | Wattmeter |
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2011
- 2011-04-20 JP JP2011093600A patent/JP5877350B2/en active Active
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2012
- 2012-04-18 WO PCT/IB2012/000763 patent/WO2012143779A1/en active Application Filing
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000338149A (en) * | 1999-05-31 | 2000-12-08 | Mitsubishi Electric Corp | Electric power measuring device |
| JP2004069466A (en) * | 2002-08-06 | 2004-03-04 | Kyoritsu Electrical Instruments Works Ltd | Electric current measuring device |
| JP2005010151A (en) * | 2003-05-28 | 2005-01-13 | Hioki Ee Corp | Wattmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301554A (en) * | 2015-12-03 | 2016-02-03 | 国网重庆市电力公司电力科学研究院 | Electric energy metering loop high precision data synchronous sampling device and method |
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| TW201300788A (en) | 2013-01-01 |
| CN103460060B (en) | 2016-03-30 |
| JP5877350B2 (en) | 2016-03-08 |
| WO2012143779A1 (en) | 2012-10-26 |
| JP2012225767A (en) | 2012-11-15 |
| TWI522627B (en) | 2016-02-21 |
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