CN1963532A - Circuit and method for preventing shunt running in electric energy measurement - Google Patents
Circuit and method for preventing shunt running in electric energy measurement Download PDFInfo
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Abstract
This invention discloses one anti-creeping circuit of energy meter, which comprises valid computation unit and status judgment unit, wherein, the said valid value computation unit is to compute input current valid value and to output computed current into status judgment unit; the judgment unit is to receive valid unit output current valid value; comparing the current valid values and pre-set valve values and when the valid values is less than valve value requiring energy meter circuit to stop metering. This invention also discloses one energy meter anti-creeping method.
Description
Technical field
The present invention relates to the electric energy metrical technology, particularly anti-shunt running circuit and the creeping prevention method in the electric energy metrical.
Background technology
Electric energy metrical is meant: the energy that metering active power takes place.Yet in the actual power metering process, power input is generally by being formed by stacking as the DC component of active power with as the AC compounent of frequency about 100 hertz of reactive power.When the input of foreign current and voltage made that DC component is zero, AC compounent still might exist, and the electric energy metrical result of this moment is the electric energy metrical result to reactive power, i.e. error.
Above-mentioned phenomenon is the shunt running in the electric energy metrical.This phenomenon makes the user when electricity consumption not, is still chargeed, and causes damage to the user.
Fig. 1 a is the structural drawing of anti-shunt running circuit 1 in the prior art.As shown in Figure 1a, the anti-shunt running circuit in the existing electric energy metrical comprises: absolute value element 101, threshold cell 102, comparer 103 and output control unit 104.
Absolute value element 101 is used for power input is taken absolute value, and the absolute value of power input is offered comparer 103;
Threshold cell 102 is used to store pre-set threshold, and offers comparer 103;
Comparer 103 is used under the situation of absolute value more than or equal to threshold value of power input, sends gating signal to output control unit 104;
Output control unit 104 is used for according to from the gating signal of comparer 103, and power input is sent to energy accumulation unit in the ic for energy metering; When the gating signal of not receiving from comparer 103, forbid that the energy accumulation unit in the ic for energy metering adds up.
Fig. 1 b is the structural drawing of anti-shunt running circuit 2 in the prior art.Shown in Fig. 1 b, the anti-shunt running circuit in the existing electric energy metrical mainly comprises: timing module, counting module and reset circuit.
Timing module is made up of the d type flip flop that some bands reset; Counting module is made up of the plus-minus counting unit that some bands reset; Reset circuit and up-down signal, major clock, master reset clock, timing module, counting module connect carries out logical process, produces anti-shunt running reset signal.
If the timing module meter is expired M second, counting module is not also exported overflow indicator, and then reset circuit produces reset signal, with counting module and timing module zero clearing, judges that promptly current state is the shunt running state, does not carry out the metering of electric energy.
Though above-mentioned two anti-shunt running circuit can reduce the influence that shunt running brings, but still have following problem:
1) because there is the ripple that is produced by AC compounent in power input, when the ripple of AC compounent when threshold value is shaken up and down, still have the part reactive power to be measured, therefore, the control accuracy deficiency of anti-shunt running circuit 1 anti-shunt running as shown in Figure 1a, can not realize high-precision anti-shunt running control, and the reliability of anti-shunt running is not high yet.
Fig. 2 is the ripple synoptic diagram of power input.As shown in Figure 2, when power input was positioned at situation on the threshold value for some time under, AC compounent still can be measured.
2) the anti-shunt running circuit 2 shown in Fig. 1 b solved the problem that anti-shunt running circuit 1 exists to a certain extent, but still there is following problem in anti-shunt running circuit 2:
Electric energy metrical is the energy that metering active power takes place, active power P
0Computing formula be:
Wherein, V is a voltage, and I is an electric current, and α is the phase place angle of electric current and voltage.
If α is near 90 degree or-90 degree, i.e. load is not pure resistive load, and then active power may show very for a short time owing to cos α is very little, often is left in the basket when metering.But how little the active power no matter ic for energy metering receives is, all is to measure it, and therefore, anti-shunt running circuit 2 can be ignored the metering to active power, thereby also have the not high problem of reliability when electric current and voltage phase place angle is very little.
As seen, the anti-shunt running circuit in the existing electric energy metrical is by judging whether current power input should be measured, and realizes the anti-shunt running in the electric energy metrical, and the precision of anti-shunt running control is not high, and reliability is also lower.
Summary of the invention
In view of this, a fundamental purpose of the present invention is, the anti-shunt running circuit in a kind of electric energy metrical is provided, and can improve the control accuracy and the reliability of anti-shunt running.
Another fundamental purpose of the present invention is, a kind of energy meter anti-creeping is provided, and can improve the control accuracy and the reliability of anti-shunt running.
Based on an above-mentioned fundamental purpose, the invention provides the anti-shunt running circuit in a kind of electric energy metrical, comprising: effective value computing unit and state judging unit, wherein,
Described effective value computing unit is used to calculate the effective value of input current, and the current effective value that calculates is exported to the state judging unit;
Described state judging unit is used to receive the current effective value that the effective value unit is exported; Current effective value and the threshold value that sets in advance are compared, and during less than threshold value, the request ic for energy metering stops metering at current effective value.
Described input current is the current digital signal of the many bits bit wide in the ic for energy metering.
Described effective value computing unit defines according to current effective value, calculates the effective value of input current.
The described threshold value that sets in advance comprises: start threshold value and shunt running threshold value;
Described state judging unit comprises: actuation threshold value cell, shunt running threshold cell, startup comparer, shunt running comparer and trigger;
Described actuation threshold value cell storage starts threshold value, and offers the startup comparer;
Described shunt running threshold cell storage shunt running threshold value, and offer the shunt running comparer;
Described startup comparer is to comparing from the current effective value of effective value computing unit with from the startup threshold value of actuation threshold value cell; When current effective value when starting threshold value, trigger is put 1, notification triggers device current state is a starting state;
Described shunt running comparer is to comparing from the current effective value of effective value computing unit with from the shunt running threshold value of shunt running threshold cell; When current effective value during less than the shunt running threshold value, with trigger reset, notification triggers device current state is the shunt running state;
When described trigger is starting state in current state, ask described energy accumulation unit begin to carry out energy accumulation and/or the request metering units begin the metering; When current state is the shunt running state, ask described energy accumulation unit stop energy accumulation and/or the request metering units stop the metering.
Described startup threshold value and shunt running threshold value all are in GB to be stipulated in the corresponding electric current span.
Another fundamental purpose based on above-mentioned the invention provides a kind of energy meter anti-creeping, may further comprise the steps:
Calculate the effective value of input current, obtain current effective value;
Current effective value and the threshold value that sets in advance are compared, and during less than threshold value, the request ic for energy metering stops metering at current effective value.
The effective value of described calculating input current is: according to the current effective value definition, calculate the effective value of input current.
The described threshold value that sets in advance comprises: start threshold value and shunt running threshold value;
Described with current effective value and the threshold value that sets in advance compare into:
The current effective value that calculates is compared with startup threshold value that sets in advance and shunt running threshold value respectively;
During less than the shunt running threshold value, judge that current state is the shunt running state at described current effective value, and carry out the described request ic for energy metering and stop metering.
When starting threshold value, described method comprises that further judgements current state is a starting state, and asks ic for energy metering to carry out electric energy metrical at described current effective value.
Greater than the shunt running threshold value and when starting threshold value, described method further comprises: if before current effective value changed, the state in the current electric energy metrical was a starting state, then carries out the described request ic for energy metering and carries out electric energy metrical at described current effective value; If before current effective value changed, the state in the current electric energy metrical was the shunt running state, then carries out the described request ic for energy metering and stop metering.
As seen from the above technical solution, the present invention calculates current effective value earlier, again according to the comparative result of current effective value and pre-set threshold, judge whether current electric energy metrical is in the shunt running state, and when judging the shunt running state, the request ic for energy metering stops metering, solved in the electric energy metrical, when electric current and voltage phase place angle is very little, the problem that active power is left in the basket and measures, thus improved the control accuracy and the reliability of anti-shunt running.
And, in the anti-shunt running circuit of the present invention, by a big threshold value being set and a little threshold value has realized the return difference effect, can prevent because the input current starting state that small and frequent shake causes about threshold value and the frequent switching of shunt running state have further improved the reliability of anti-shunt running.
Description of drawings
Fig. 1 a is the structural drawing of anti-shunt running circuit 1 in the prior art.
Fig. 1 b is the structural drawing of anti-shunt running circuit 2 in the prior art.
Fig. 2 is the ripple synoptic diagram of power input.
Fig. 3 is the structural representation of ic for energy metering.
Fig. 4 is the exemplary block diagram of the anti-shunt running circuit in the electric energy metrical of the present invention.
Fig. 5 is the exemplary process diagram of energy meter anti-creeping of the present invention.
Fig. 6 is the synoptic diagram that anti-shunt running circuit is realized the return difference effect in the embodiment of the invention.
Fig. 7 is the structural drawing of anti-shunt running circuit in the embodiment of the invention.
Fig. 8 is the process flow diagram of creeping prevention method in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Basic thought of the present invention is: the basic functional principle of the anti-shunt running circuit of present embodiment is: calculate current effective value earlier, again according to the comparative result of current effective value and pre-set threshold, judge whether current electric energy metrical is in the shunt running state.
Current effective value is defined as: with the constant current value that exchanges the thermal effect equivalence current effective value, can be expressed as:
i
2(t)*R*t＝I_
2rms*R*t
Wherein, i (t) is an input current; R is a pull-up resistor; T is the time; I_rms is a current effective value, and is permanent in 0.
When input was stable, current effective value I_rms was a more stable numerical value, and therefore, this numerical value is to be used for judging the starting state of electric energy metrical and the desired quantity of shunt running state.If I_rms is greater than pre-set threshold, then electric energy metrical is in starting state, can carry out electric energy metrical; If I_rms is less than this pre-set threshold, then electric energy metrical is in the shunt running state, does not need to carry out electric energy metrical.
Anti-shunt running circuit of the present invention can be used for existing ic for energy metering, realizes the anti-shunt running of electric energy metrical.
Fig. 3 is the structural representation of ic for energy metering.As shown in Figure 3, generally, ic for energy metering comprises: AD conversion unit 301 and AD conversion unit 302, filtering extraction unit 303 and filtering extraction unit 304, multiplier 305, low-pass filter 306, energy accumulation unit 307 and metering units 308.
Filtering extraction unit 303 and filtering extraction unit 304 are converted to the voltage digital signal of the current digital signal of 1 bit and 1 bit the parallel current digital signal and the parallel voltage digital signal of a plurality of bits more respectively, and parallel current digital signal and parallel voltage digital signal are exported to multiplier 305.
306 pairs of instantaneous powers from multiplier of low-pass filter are carried out low-pass filtering, and filtered instantaneous power is exported to energy accumulation unit 307 as power input.
Wherein, metering units 308 also can be the functional unit outside the ic for energy metering, for example measuring apparatus in the ammeter.
In the above-mentioned ic for energy metering, each unit can carry out inter-process and mutual information interaction under the control of synchronizing signal; This synchronizing signal can be from the synchronous device outside the ic for energy metering, and for example crystal oscillator also can be produced by any one unit in the ic for energy metering, for example multiplier 305 or low-pass filter 306, and send to other unit; Each unit in the above-mentioned ic for energy metering also can all carry out reset operation when receiving systematic reset signal; AD conversion unit 301 and filtering extraction unit 303, AD conversion unit 302 and filtering extraction unit 304 also can be respectively two directly AD conversion unit of output parallel signal.
Also can not comprise low-pass filter 306 in the above-mentioned ic for energy metering, at this moment, multiplier 305 offers energy accumulation unit 307 directly with the power input of instantaneous power as energy accumulation unit 307.
Fig. 4 is the exemplary block diagram of a kind of anti-shunt running circuit among the present invention.As shown in Figure 4, the anti-shunt running circuit in the electric energy metrical of the present invention comprises: effective value computing unit 401 and state judging unit 402.
Effective value computing unit 401 is used to calculate the effective value of input current, and the current effective value that calculates is exported to state judging unit 402;
Wherein, effective value computing unit 401 can calculate the effective value of input current according to the definition of current effective value.
Fig. 5 is the exemplary process diagram of energy meter anti-creeping of the present invention.As shown in Figure 5, energy meter anti-creeping of the present invention may further comprise the steps:
Step 502 compares current effective value and the threshold value that sets in advance, and during less than threshold value, the request ic for energy metering stops metering at current effective value.
Wherein, in the above-mentioned steps 501, can calculate the effective value of input current according to the definition of current effective value.
Below, in conjunction with specific embodiments, anti-shunt running circuit and creeping prevention method among the present invention are elaborated.
The anti-shunt running circuit of present embodiment is used for solving at electric energy metrical, when electric current and voltage phase place angle is very little, and the uncared-for problem of active power, thereby the anti-shunt running function in the realization electric energy metrical.
Consider that input current may have the situation of shake small and frequent about threshold value, starting state and shunt running state also can be frequent follow change, therefore, based on the return difference effect, be provided with a big threshold value and a little threshold value in the anti-shunt running circuit in the present embodiment, be used to prevent the frequent switching of starting state and shunt running state.Wherein, the big threshold value of setting and little threshold value can be set arbitrarily according to the actual conditions of ic for energy metering, but both all should be in GB and stipulate in the corresponding electric current span.
Fig. 6 is the synoptic diagram that anti-shunt running circuit is realized the return difference effect in the embodiment of the invention.As shown in Figure 6, starting threshold value is above-mentioned big threshold value, and the shunt running threshold value is above-mentioned little threshold value; Startup threshold value and shunt running threshold value are divided into the span of I_rms the promoter region, keep district and shunt running district three parts.
When I_rms when starting threshold value, when promptly being in the promoter region, the state of anti-shunt running circuit judges this moment is a starting state; As I_rms during less than the shunt running threshold value, promptly be in the shunt running district, the state of anti-shunt running circuit judges this moment is the shunt running state; When I_rms was in the maintenance district, anti-shunt running circuit kept I_rms to change preceding state, promptly enters from the promoter region when keeping the district, still keeps starting state; Enter when keeping the district from the shunt running district, still keep the shunt running state.
The anti-shunt running circuit of present embodiment judges according to current effective value whether current electric energy metrical is in the shunt running state.The input value of this circuit is from the filtering extraction unit 303 in the ic for energy metering as shown in Figure 3, and promptly input value is parallel current digital signal; The anti-shunt running circuit of present embodiment can be exported to the energy accumulation unit 307 or the metering units 308 of anti-shunt running circuit as shown in Figure 3 with the judged result of this circuit to the shunt running state in the ic for energy metering.
Fig. 7 is the structural drawing of anti-shunt running circuit in the embodiment of the invention.As shown in Figure 7, anti-shunt running circuit of the present invention comprises: effective value computing unit 701, actuation threshold value cell 702, shunt running threshold cell 703, startup comparer 704, shunt running comparer 705 and trigger 706.
Effective value computing unit 701 is used for receiving the current digital signal from the filtering extraction unit 303 of as shown in Figure 3 ic for energy metering, and calculates the effective value of this input current according to the definition of current effective value; The current effective value that calculates is offered startup comparer 704 and shunt running comparer 705.
Wherein, current digital signal also can not be from filtering extraction unit 303, but identical current signal in another road and the ic for energy metering, the current digital signal that is used for analog-to-digital device output outside ic for energy metering as shown in Figure 3.
Actuation threshold value cell 702 and shunt running threshold cell 703 are respectively applied for storage and start threshold value and shunt running threshold value, and offer startup comparer 704 and shunt running comparer 705 respectively.
In the foregoing circuit, the output of trigger 706 can link to each other with the input of energy accumulation unit 307 in as shown in Figure 3 the ic for energy metering, with the signal of trigger 706 output control signal as energy accumulation unit 307, energy accumulation unit 307 is according to the signal of trigger 706 outputs, when being in starting state, the electric energy metrical road carries out energy accumulation, when ic for energy metering is in the shunt running state, stop energy accumulation, realize the anti-shunt running in the electric energy metrical; The output of trigger 706 can also link to each other with the input of metering units 308 in as shown in Figure 3 the ic for energy metering, with the signal of trigger 706 output control signal as metering units 308, metering units 308 is according to the signal of trigger 706 outputs, the calibration pulse of metering energy accumulation unit 307 outputs when the electric energy metrical road is in starting state, when ic for energy metering is in the shunt running state, judge that the calibration pulse of energy accumulation unit 307 outputs is an invalid signals.
In the above-mentioned anti-shunt running circuit, the combination of actuation threshold value cell 702, shunt running threshold cell 703, startup comparer 704, shunt running comparer 705 and trigger 706 is equivalent to the state judging unit 402 in the anti-shunt running circuit as shown in Figure 4.
More than be explanation to anti-shunt running circuit in the embodiment of the invention, below, the creeping prevention method in the embodiment of the invention is described.
The creeping prevention method of present embodiment is based on current effective value and guarantees that the energy accumulation result is the result under the non-shunt running state, guarantees that promptly the calibration pulse in the ic for energy metering is effective impulse.
Fig. 8 is the process flow diagram of creeping prevention method in the embodiment of the invention.As shown in Figure 8, creeping prevention method of the present invention may further comprise the steps:
In this step, the method for calculating current effective value is: the definition according to current effective value is calculated, and computation process can be expressed as:
i
2(t)*R*t＝I_
2rms*R*t
Wherein, i (t) is an input current; R is a pull-up resistor; T is the time; I_rms is a current effective value, and is permanent in 0.
Step 802 compares current effective value respectively with startup threshold value that sets in advance and shunt running threshold value.
Step 803 according to comparative result, is judged current state, if current effective value is greater than starting threshold value, then Ci Shi state is a starting state, execution in step 804; If current effective value is less than the shunt running threshold value, then Ci Shi state is the shunt running state, execution in step 805; If current effective value less than starting threshold value greater than the shunt running threshold value, then keeps the state before this step constant, according to original state execution in step 804 or 805.
In this step, if current effective value is less than starting threshold value greater than the shunt running threshold value, and the state of current effective value before changing is starting state, and then execution in step 804; If current effective value is less than starting threshold value greater than the shunt running threshold value, and the state of current effective value before changing is the shunt running state, and then execution in step 805.
Step 804 is carried out accumulated counts to the calibration pulse in the ic for energy metering, realizes the electric energy metrical under the non-shunt running state, and process ends.
Anti-shunt running circuit and creeping prevention method in the embodiment of the invention can remedy the deficiency of existing anti-shunt running circuit and creeping prevention method, thereby can realize anti-shunt running in the electric energy metrical in conjunction with existing anti-shunt running circuit and creeping prevention method.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, the anti-shunt running circuit in a kind of electric energy metrical is characterized in that, comprising: effective value computing unit and state judging unit, wherein,
Described effective value computing unit is used to calculate the effective value of input current, and the current effective value that calculates is exported to the state judging unit;
Described state judging unit is used to receive the current effective value that the effective value unit is exported; Current effective value and the threshold value that sets in advance are compared, and during less than threshold value, the request ic for energy metering stops metering at current effective value.
2, anti-shunt running circuit as claimed in claim 1 is characterized in that, described input current is the current digital signal of the many bits bit wide in the ic for energy metering.
3, anti-shunt running circuit as claimed in claim 2 is characterized in that, described effective value computing unit defines according to current effective value, calculates the effective value of input current.
4, as claim 2 or 3 described anti-shunt running circuit, it is characterized in that the described threshold value that sets in advance comprises: start threshold value and shunt running threshold value;
Described state judging unit comprises: actuation threshold value cell, shunt running threshold cell, startup comparer, shunt running comparer and trigger;
Described actuation threshold value cell storage starts threshold value, and offers the startup comparer;
Described shunt running threshold cell storage shunt running threshold value, and offer the shunt running comparer;
Described startup comparer is to comparing from the current effective value of effective value computing unit with from the startup threshold value of actuation threshold value cell; When current effective value when starting threshold value, trigger is put 1, notification triggers device current state is a starting state;
Described shunt running comparer is to comparing from the current effective value of effective value computing unit with from the shunt running threshold value of shunt running threshold cell; When current effective value during less than the shunt running threshold value, with trigger reset, notification triggers device current state is the shunt running state;
When described trigger was starting state in current state, request energy accumulation unit begins to carry out energy accumulation and/or the request metering units begins metering; When current state was the shunt running state, request energy accumulation unit stops energy accumulation and/or the request metering units stops metering.
5, anti-shunt running circuit as claimed in claim 4 is characterized in that, described startup threshold value and shunt running threshold value all are in GB to be stipulated in the corresponding electric current span.
6, a kind of energy meter anti-creeping is characterized in that, may further comprise the steps:
Calculate the effective value of input current, obtain current effective value;
Current effective value and the threshold value that sets in advance are compared, and during less than threshold value, the request ic for energy metering stops metering at current effective value.
7, creeping prevention method as claimed in claim 6 is characterized in that, the effective value of described calculating input current is: according to the current effective value definition, calculate the effective value of input current.
As claim 6 or 7 described creeping prevention methods, it is characterized in that 8, the described threshold value that sets in advance comprises: start threshold value and shunt running threshold value;
Described with current effective value and the threshold value that sets in advance compare into:
The current effective value that calculates is compared with startup threshold value that sets in advance and shunt running threshold value respectively;
During less than the shunt running threshold value, judge that current state is the shunt running state at described current effective value, and the request ic for energy metering stops metering.
9, method as claimed in claim 8 is characterized in that, when starting threshold value, described method comprises that further judgements current state is a starting state, and asks ic for energy metering to carry out electric energy metrical at described current effective value.
10, method as claimed in claim 9, it is characterized in that, at described current effective value greater than the shunt running threshold value and when starting threshold value, described method further comprises: if before current effective value changes, state in the current electric energy metrical is a starting state, then carries out the described request ic for energy metering and carries out electric energy metrical; If before current effective value changed, the state in the current electric energy metrical was the shunt running state, then carries out the described request ic for energy metering and stop metering.
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| CNB2006101622248A CN100425994C (en) | 2006-12-06 | 2006-12-06 | Circuit and method for preventing shunt running in electric energy measurement |
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| CNB2006101622248A CN100425994C (en) | 2006-12-06 | 2006-12-06 | Circuit and method for preventing shunt running in electric energy measurement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102654523A (en) * | 2011-05-04 | 2012-09-05 | 杭州万工科技有限公司 | Method and device for judging starting state and shunt running state in electric energy metering |
| 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 |
| CN103713189A (en) * | 2013-12-31 | 2014-04-09 | 上海贝岭股份有限公司 | Power shunt running quick detection circuit |
| CN109884578A (en) * | 2019-04-10 | 2019-06-14 | 宁夏隆基宁光仪表股份有限公司 | A kind of quick method and tool of the anti-shunt running performance test of electronic electric energy meter |
| CN110988780A (en) * | 2019-11-05 | 2020-04-10 | 广西电网有限责任公司 | Method for realizing power frequency anti-shunt running and electric energy meter |
| CN111007310A (en) * | 2019-12-26 | 2020-04-14 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
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| GB9316775D0 (en) * | 1993-08-12 | 1993-09-29 | Siemens Measurements Ltd | Improvements in or relating to metering |
| CN2289247Y (en) * | 1996-05-28 | 1998-08-26 | 国营西南电子设备厂 | All electronic pre-payment IC card electric energy meter |
| CN1081335C (en) * | 1998-10-10 | 2002-03-20 | 杭州华立股份有限公司 | Anticreep piece for electric energy meter |
| CN2490585Y (en) * | 2000-12-05 | 2002-05-08 | 哈尔滨九洲电气股份有限公司 | Intelligence pulse electric meter |
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| CN2718903Y (en) * | 2004-06-16 | 2005-08-17 | 上海贝岭股份有限公司 | Anti-shunt running circuit in electric energy metering chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654523A (en) * | 2011-05-04 | 2012-09-05 | 杭州万工科技有限公司 | Method and device for judging starting state and shunt running state in electric energy metering |
| CN102654523B (en) * | 2011-05-04 | 2014-07-02 | 万高(杭州)科技有限公司 | Method and device for judging starting state and shunt running state in electric energy metering |
| 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 |
| CN102721862B (en) * | 2012-05-22 | 2014-08-20 | 钜泉光电科技(上海)股份有限公司 | Method for reducing electric energy pulse jitter |
| CN103713189A (en) * | 2013-12-31 | 2014-04-09 | 上海贝岭股份有限公司 | Power shunt running quick detection circuit |
| CN109884578A (en) * | 2019-04-10 | 2019-06-14 | 宁夏隆基宁光仪表股份有限公司 | A kind of quick method and tool of the anti-shunt running performance test of electronic electric energy meter |
| CN110988780A (en) * | 2019-11-05 | 2020-04-10 | 广西电网有限责任公司 | Method for realizing power frequency anti-shunt running and electric energy meter |
| CN110988780B (en) * | 2019-11-05 | 2022-04-22 | 广西电网有限责任公司 | Method for realizing power frequency anti-shunt running and electric energy meter |
| CN111007310A (en) * | 2019-12-26 | 2020-04-14 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
| CN111007310B (en) * | 2019-12-26 | 2022-06-21 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
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