CN110221240A - The detection circuit and electric energy computation chip of bleeder circuit parameter - Google Patents
The detection circuit and electric energy computation chip of bleeder circuit parameter Download PDFInfo
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- CN110221240A CN110221240A CN201910579839.8A CN201910579839A CN110221240A CN 110221240 A CN110221240 A CN 110221240A CN 201910579839 A CN201910579839 A CN 201910579839A CN 110221240 A CN110221240 A CN 110221240A
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 13
- 238000012937 correction Methods 0.000 claims description 15
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- 230000005611 electricity Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 10
- 238000005070 sampling Methods 0.000 description 9
- 230000003139 buffering effect Effects 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The application belongs to voltage detecting technical field, provide a kind of detection circuit of bleeder circuit parameter, including the bleeder circuit coupled with the first signal source with first frequency, the bleeder circuit includes concatenated first divider, the second divider and third divider, voltage measurement module is parallel on second divider, the detection circuit further includes second signal source；Voltage measurement module input terminal is arranged for configuring input impedance, common mode inhibition and the buffer of the linearity, voltage measurement module is used to detect the first signal component of the second frequency on second divider, determines whether the circuit parameter of the bleeder circuit is abnormal according to first signal component.
Description
Technical field
The application belongs to the detection circuit and electric energy meter of voltage detecting technical field more particularly to a kind of bleeder circuit parameter
Measure chip.
Background technique
The intelligentized demand for development of electric energy metered system establishes smart grid, can be conducive to the automation for reinforcing power grid in this way
And informationization, enhance power grid self-protection ability, preferably safeguards the operation and safety of power grid.Intelligent electric-energy metering system requirements
Realize digitlization, standardization, networking and the intelligence of electrical energy measurement.Its digitlization, which refers to employ new technology, realizes new digital
Formula electric energy metering device, the accuracy and reliability of optimized integration data；Its intelligence refers in accurate electric energy measurement data
On the basis of, the power information of user, job information (for example whether measuring accuracy changes), the electric energy of electric energy meter can be stored
The abnormal conditions (abnormal conditions such as short circuit, open circuit, stealing) of table.The electric energy meter therefore with accurately automatic fault detection is intelligence
The important composition part of energy electric energy metered system.
Currently, typically passing through sampling network for voltage attenuation to be measured in the voltage measuring apparatus of tape jam detection
To within the input voltage safe range of A-D converter (Analog to Digital Converter, ADC), turn by ADC
Numeral output after changing enters the processing that digital processing element carries out voltage amplitude and phase；It simultaneously will be special after sampling network
The detection signal of door gives ADC, and the numeral output after ADC is converted enters digital processing element and carries out voltage amplitude and phase
Processing, changed by the amplitude and phase of observation detection signal, it is known that the outer component faults of the piece in the outer sampling network of piece,
To know voltage measurement error is how many.And since the internal resistance of voltage measuring apparatus is not big enough and sampling network one works
Afterwards, cause the detection signal amplitude of ADC input terminal with ADC internal resistance variation acute variation, therefore ADC internal resistance is with technique change
When will affect detection signal measurement accuracy；The detection signal of ADC input terminal is Gao Gongmo/weak differential signal simultaneously, it is desirable that ADC
It is capable of providing high cmrr, and general ADC does not have high common mode inhibition, will affect the measurement accuracy of detection signal.
Summary of the invention
The detection circuit and electric energy computation chip for being designed to provide a kind of bleeder circuit parameter of the application, it is intended to solve
Existing tension measuring circuit is since internal resistance is not big enough and ADC does not have high common mode inhibition and influences measurement accuracy problem.
The first aspect of the embodiment of the present application provides a kind of detection circuit of bleeder circuit parameter, including with there is the first frequency
The bleeder circuit of the first signal source coupling of rate, the bleeder circuit include concatenated first divider, the second divider and the
Three divider are parallel with voltage measurement module, the detection circuit on second divider further include:
Second signal source inputs, the second signal in the connecting pin of second divider and the third divider
Source has second frequency；
The voltage measurement module input terminal setting one configures the buffering of impedance, common mode inhibition and the linearity on demand
Device, the voltage measurement module are used to detect the first signal component of the second frequency on second divider, according to
First signal component determines whether the circuit parameter of the bleeder circuit is abnormal.
The second aspect of the embodiment of the present application provides a kind of electric energy computation chip, and the electric energy computation chip includes above-mentioned
Detection circuit；The bleeder circuit is set to outside the electric energy computation chip.
The third aspect of the embodiment of the present application provides a kind of electric energy computation chip, including bleeder circuit, the electrical energy measurement
Chip further includes above-mentioned detection circuit.
The detection circuit of above-mentioned bleeder circuit parameter increases a buffer in input side, and buffer can be arranged to have
The characteristic of high input impedance can eliminate the limited influence to fault detection signal precision of ADC internal resistance；Tool can also be arranged in buffer
Have the characteristic of high common mode inhibition, can inhibit detect signal common mode part, ensure that high common mode buffer output (ADC's
Input) at fault detection signal no longer there is high common-mode signal, to alleviate the common mode inhibition pressure of ADC, improve therefore
The measurement accuracy of barrier detection signal；The characteristic with high linearity can be arranged in simultaneous buffering device, it is ensured that voltage measuring apparatus
Linearity when the measured voltage signal to strong amplitude measures.
Detailed description of the invention
Fig. 1 is the schematic diagram of the detection circuit of traditional bleeder circuit parameter；
Fig. 2 is the module diagram of the detection circuit for the bleeder circuit parameter that the application first embodiment provides；
Fig. 3 is the schematic illustration of the first embodiment of voltage measurement module in detection circuit shown in fig. 1；
Fig. 4 is the schematic illustration of the second embodiment of voltage measurement module in detection circuit shown in fig. 1；
Fig. 5 is the schematic illustration of the 3rd embodiment of voltage measurement module in detection circuit shown in fig. 1；
Fig. 6 is measuring signal in the detection circuit shown in Fig. 5 and the waveform for detecting signal；
Fig. 7 is the schematic illustration of the detection circuit for the bleeder circuit parameter that the application second embodiment provides.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, and
It is not used in restriction the application.
Referring to Fig. 1, wherein Vm(Fig. 1 label 201) is to be measured voltage；Dotted line frame 100 is voltage sample network, by
Rext1(Fig. 1 label 202), Rint1(Fig. 1 label 203), Rint2(Fig. 1 label 204) is constituted, and the presence of sampling network mainly will
The safety that signal to be detected decays to ADC can be in input range；Dotted line frame 200 is signal processing unit, by AD conversion unit
(Fig. 1 label 205) and digital signal processing unit (Fig. 1 label 209,210) are constituted, and in existing scheme, dotted line frame 200 was both made
For measuring signal processing unit, and as detection signal processing unit；Dotted line frame 300 is sensed signal sources, by sequence switch S1、
S2(Fig. 1 label 206,207) and ac current source (Fig. 1 label 208) are constituted, and in existing scheme, detect signal through over-sampling
Network generates detection signal in modulo unit input terminal, and detection signal generates detected value by signal processing unit.
As switch S2Closure, S1It disconnects, it is assumed that alternating current source frequency is fi, it is assumed that voltage signal V to be measuredmIt is to hand over
It flows signal and frequency is fu, and fi≠fu, ADC input impedance is defined as Radc,in。
It is U in the voltage signal that ADC input terminal generates that ac current source, which is defined, by resitstance voltage divider0,fi_1。
It individually calculates ac current source and passes through the differential voltage signal U that resitstance voltage divider generates0,fi_1_dm:
Due to typically the input voltage of voltage attenuation to be measured to ADC being pacified by sampling network in voltage measurement
Within gamut, common Rext1For 1M ohms, Rint1/Rint2For 1K ohms, if ADC internal resistance Radc,inIn 200K~220K
Change (technological parameter determines ADC internal resistance variation range) between ohms, then detects the differential voltage part U of signal0,fi_1_dmBecome
Having changed is about 8% or so, therefore has seriously affected the measurement accuracy of detection signal.
It individually calculates ac current source and passes through the common mode voltage signal U that resitstance voltage divider generates0,fi_1_cm:
According to common Rext1/Rint1/Rint2And ADC internal resistance Radc,inValue, available U0,fi_1Common-mode signal ratio it is poor
High 300 times of sub-signal or more, thus ADC itself there are random mismatches can be U0,fi_1Common-mode signal be converted into differential signal,
The same measurement accuracy for influencing detection signal.
Voltage measuring apparatus is while measuring fault detection signal, it is also desirable to normal voltage measurement is carried out,
This measured voltage signal is strong differential signal, it is desirable that voltage measuring apparatus has the feature of high linearity.
Referring to Fig. 2, the detection circuit for the bleeder circuit parameter that one embodiment of the application provides is in above-mentioned traditional scheme
On the basis of, and omit Rext1、Rint1Between the signal source that accesses, a high input impedance/high common mode suppression is increased before ADC
System/high linearity buffer.
Therefore, the detection circuit of bleeder circuit parameter provided in this embodiment includes and the first signal with first frequency
The bleeder circuit 20 that source 10 couples, bleeder circuit 20 include concatenated first divider 21, the second divider 22 and third point
Depressor 23 is parallel with voltage measurement module 30 on second divider 22, and detection circuit further includes second signal source 40, second signal
Source 40 is inputted in the connecting pin of the second divider 303 and third divider, and second signal source 40 has second frequency；Voltage measurement
The buffer 31 for configuring input impedance, common mode inhibition and the linearity, voltage measurement module 30 is arranged in 30 input terminal of module
For detecting the first signal component of the second frequency on the second divider 22, bleeder circuit 20 is determined according to the first signal component
Circuit parameter it is whether abnormal.Simultaneously it was determined that the circuit parameter in second signal source 40 is (used in signal source generating circuit
Feedback resistance) it is whether abnormal.
On the basis of the detection circuit of tape jam detection, a high input impedance/high common mode inhibition/high linearity is added
Buffer 31 can eliminate detection signal with detection circuit internal resistance variation and the phenomenon that acute variation, while can inhibit
The common mode part of signal is detected, and meets the linearity of detection circuit.It ensure that the measurement accuracy of detection signal, again
It can satisfy linearity when carrying out voltage measurement.
It is understood that second signal source 40 can also be accessed by first switch (not shown), voltage measurement module
30 detect the first signal component in the case where only first switch accesses.Second signal source 40 is ac current source.In addition, tested
Measure voltage VmFrequency it is different from the frequency in second signal source 40, second frequency be first frequency it is non-integral multiple.Such as it is tested
Measure voltage VmWhen frequency is 50Hz, 40 frequency of second signal source is chosen as 432Hz.Second signal source 40 is mainly by reference voltage
Source, operational amplifier, current mirror pipe combine the current source generated with feedback resistance.Actual current source internal circuit can be by opening
It closes to control the output waveform of this current source as AC signal.First divider 21, the second divider 22 and third divider 23
Circuit to be made of at least one of resistance, inductance, capacitor.
As an embodiment, the internal resistance R_in of buffer 31 is more than 100M ohms, such as in 200M~300M ohms
Between.
Referring to Fig. 3, voltage measurement module 30 includes buffer 31, AD conversion unit (device) 32 as an embodiment
With digital signal processing unit (device) 33.Voltage measurement module 30 is measured to fault detection signal (the first signal component)
While, it is also desirable to the second signal component (voltage measurement signal) for detecting the first frequency on the second divider 22, also according to
The circuit parameter of first signal component and second signal component correction bleeder circuit 20, and according to second signal component and after correcting
The circuit parameter of bleeder circuit 20 carry out normal voltage measurement.
In conjunction with Fig. 2 and Fig. 3, it is assumed that 40 frequency of second signal source is fi, it is assumed that voltage signal V to be measuredmIt is AC signal and frequency
Rate is fu, and fi≠fu, 31 input impedance of buffer is defined as Rin。
Second signal source 40 is defined by bleeder circuit 20 is in the voltage signal that the input terminal of buffer 31 generates
U0,fi_1。
Individually calculate the differential voltage signal U that second signal source 40 is generated by bleeder circuit 200,fi_1_dm:
Due in voltage measurement, typically passing through sampling network (bleeder circuit 20) for voltage attenuation to be measured to modulus
Within the input voltage safe range of converting unit 31, the resistance value R of common first divider 21ext1For 1M ohms, second point
The resistance value R of depressor 22 and third divider 23int1、Rint2For 1K ohms, if buffer internal resistance RinIn 200M~300M
Change (worst buffer internal resistance variation range) between ohms, then detects the differential voltage part U of signal0,fi_1_dmVariation
It is about 0.1% or so, therefore the measurement accuracy for detecting signal is not influenced substantially by buffer internal resistance variation.
Individually calculate the common mode voltage signal U that second signal source 40 is generated by bleeder circuit 200,fi_1_cm:
According to the internal resistance R of common first divider 21, the second divider 22 and third divider 23 and buffer 31in
Value, available U0,fi_12000 times higher than differential signal of common-mode signal or more, therefore buffer 31 requires the common mode of itself to press down
Make it is very capable, can both eliminate detection signal common mode value, guarantee 31 input terminal of AD conversion unit detection signal only have
Differential part, to mitigate the common mode inhibition requirement of AD conversion unit 31；Simultaneous buffering device itself will not be detection signal
Common mode be partially converted into differential signal.Buffer features described above ensure that the not examined signal of measurement accuracy of detection signal is total
The influence of mould part.
Simultaneous buffering device 31 requires the linearity of itself high, because being measured voltage VmIt is strong input signal, signal amplitude
It is very big, it is desirable that the linearity of measuring device itself is enough, is just able to satisfy measured voltage VmMeasurement accuracy.
Referring to Fig. 4, voltage measurement module 30 includes the first buffer 301, the second buffer as another embodiment
302, measurement calibration unit 303 and voltage measurement unit 304.
First buffer 301 is for configuring input impedance and common mode inhibition, and the first buffer 301 and the second divider are simultaneously
Connection, measurement calibration unit 303 are connect with the first buffer 301；It is understood that measurement calibration unit 303 turns including modulus
Parallel operation and digital signal processor.Measurement calibration unit 303 is used to detect the first signal of the second frequency on the second divider
Component determines whether the circuit parameter of bleeder circuit is abnormal, and partial pressure is corrected when circuit parameter exception according to the first signal component
Circuit parameter.Second buffer 302 is for configuring the linearity, and the second buffer 302 is in parallel with the second divider, voltage measurement list
Member 304 is connect with the second buffer 302；It is understood that voltage measurement unit 304 includes analog-digital converter and digital signal
Processor.Voltage measurement unit 304 is used to detect the second signal component of the first frequency on the second divider, and measurement correction is single
Member 303 is the bleeder circuit parameter according to the first signal component and second signal component correction.304 basis of voltage measurement unit
Bleeder circuit parameter after second signal component and correction carries out voltage measurement.
In the present embodiment, voltage measurement signal and fault detection signal are measured with different channels respectively, are being realized
While being corrected to fault detection signal, the normal measurement of measuring signal is not influenced；It avoids same in voltage measurement channel
When introduce detection signal and measuring signal, the correction for detecting signal influence whether the normal measurement of voltage measuring apparatus.
Referring to Fig. 5, voltage measurement module 30 further includes error correction switch 305, error correction switch 305 and second point
Depressor 22 is in parallel, and error correction switch 305 is connected with the first buffer 301, and error correction switch 305 will be for that will be linked into measurement
The signal for correcting the analog-digital converter of unit 304 carries out positive and negative overturning.Referring to Fig. 6, when band measurement calibration unit 303 opens school
When orthofunction, positive-negative input end of the error correction switch 305 in T1 period and the time end T2 exchange measurement calibration unit 303,
V is named as in the detection signal of the input terminal of measurement calibration unit 303edt, Fig. 6 shows the V of measurement calibration unit 303edtWave
The V of shape and voltage measurement module 30mWaveform, from fig. 6, it can be seen that when measurement calibration unit 303 is to VedtSignal is corrected
When, the V of voltage measurement module 30mSignal is entirely unaffected by, and can work normally, therefore nor affects on the electricity of final electric energy meter
It can metering.
Referring to Fig. 7, detection circuit further includes having the third signal source 50 of third frequency.Third signal source 50 is first
The input of the connecting pin of divider 21 and the second divider 22；Voltage measurement module 30 is also used to detect on the second divider 22
The third signal component of three frequencies determines whether the circuit parameter of bleeder circuit is abnormal according to third signal component.As another
Kind embodiment, third signal source 50 and second signal source 40 are the same signal source, by another branch in the first divider 21
It is inputted with the connecting pin of the second divider 22.
As a preferred embodiment, the measurement calibration unit 303 in voltage measurement module 30 is specifically used for the first signal
Component and third signal component are handled, and the range value, phase value and third signal component of the first signal component are respectively obtained
Range value, phase value, and according to the range value of the first signal component variation, third signal range value variation, the first signal
At least one of the phase change of component, phase change of third signal component determine bleeder circuit 20 circuit parameter whether
It is abnormal.
Third signal source 50 is also ac current source, and second signal source 40 and 50 frequency of third signal source can be identical,
Can be different, amplitude may be the same or different.
50/ second signal source 40 of third signal source can also be accessed by second switch (not shown), measurement calibration unit
303 detect second signal component in the case where only second switch accesses.Third signal source 50 is ac current source, is measured electricity
Press VmFrequency it is different from the frequency of third signal source 50, third frequency be first frequency it is non-integral multiple.Such as it is measured electricity
Press VmWhen frequency is 50Hz, 50 frequency of third signal source is chosen as 432Hz.Third signal source 50 mainly by reference voltage source,
Operational amplifier, current mirror pipe combine the current source generated with feedback resistance.Actual current source internal circuit can pass through switch
It is AC signal to control the output waveform of this current source.
As an embodiment, second signal source 40, third signal source 50 signal source circuit used in internal resistance feedback electricity
It hinders identical as the temperature coefficient of the first divider 21.It can come offset measurement channel first by the temperature coefficient of feedback resistance simultaneously
The temperature coefficient of divider 21.In this way, the feedback resistance in second signal source 40, third signal source 50 can be placed on outside piece, mainly
The reason is that by selecting the off chip resistor of arbitrary temp coefficient that the ac current source of arbitrary temp coefficient can be obtained.
Second divider 22, third divider 23 and voltage measurement module 30 be integrated circuit piece in device, first
Feedback resistance used in the generation circuit of divider 21, second signal source 40 and third signal source 50 is the piece of integrated circuit
Outer device.The main reason for feedback resistance in second signal source 40, third signal source 50 is placed on outside piece by selection is to pass through selection
The current source of arbitrary temp coefficient can be obtained in the off chip resistor of arbitrary temp coefficient.It simultaneously can be by the temperature coefficient of feedback resistance
Carry out offset measurement channel first resistor Rext1Temperature coefficient.
Bleeder circuit 20 does not limit impedance type, such as Z0, Z1, Z2 in the following figure can be resistance, capacitor, inductance resistance
It is anti-, it is also possible to the impedances such as their combination, such as resistance capacitance parallel connection.If sampling network contains the members such as capacitor, inductance
Device, can be by monitoring the amplitude and phase knots modification of detection signal simultaneously come positioning failure source.
Additional ac current source is introduced in conventional voltage Measurement channel, by the Given information of ac current source and certain
Switching sequence information come whether the outer component of locating plate breaks down, to reach the function of being accurately positioned the source of trouble.Meanwhile passing through
This voltage measuring apparatus reasonably selects the off chip resistor with identical temperature coefficient, may make measurement electrical voltage system with temperature
Compensation effect can further improve voltage measurement accuracy, and reduce voltage measurements is influenced by temperature drift.Wherein, apply
Alternating current source signal, can be various cyclical signals, for example, sine wave signal, square-wave signal, triangular signal etc..
The embodiment of the present application also provides a kind of electric energy computation chip, which includes detection electricity above-mentioned
Road.In the embodiment of the present application, bleeder circuit is set to outside electric energy computation chip.Specifically, detection circuit is integrated in chip
Inside, at this point, the detection circuit of chip interior is not affected by, further, first switch and the second switch
Switch state voluntarily carries out the switching of switch state after being set as to be launched in voltage measurement module in advance.
The embodiment of the present application also proposed another electric energy computation chip, the electric energy computation chip include bleeder circuit with
And detection circuit as the aforementioned.
The detection circuit of above-mentioned bleeder circuit parameter increases a buffer in input side, and buffer can be arranged to have
The characteristic of high input impedance can eliminate the limited influence to fault detection signal precision of ADC internal resistance；Tool can also be arranged in buffer
Have the characteristic of high common mode inhibition, can inhibit detect signal common mode part, ensure that high common mode buffer output (ADC's
Input) at fault detection signal no longer there is high common-mode signal, to alleviate the common mode inhibition pressure of ADC, improve therefore
The measurement accuracy of barrier detection signal；The characteristic with high linearity can be arranged in simultaneous buffering device, it is ensured that voltage measuring apparatus
Linearity when the measured voltage signal to strong amplitude measures.
The above is only the preferred embodiments of the application, not to limit the application, it is all in spirit herein and
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within principle.
Claims (10)
1. a kind of detection circuit of bleeder circuit parameter, including the partial pressure electricity coupled with the first signal source with first frequency
Road, the bleeder circuit include concatenated first divider, the second divider and third divider, on second divider simultaneously
It is associated with voltage measurement module, which is characterized in that the detection circuit further include:
Second signal source is inputted in the connecting pin of second divider and the third divider, the second signal source tool
There is second frequency；
The voltage measurement module input terminal is arranged for configuring input impedance, common mode inhibition and the buffer of the linearity, institute
Voltage measurement module is stated for detecting the first signal component of the second frequency on second divider, according to described the
One signal component determines whether the circuit parameter of the bleeder circuit is abnormal.
2. detection circuit as described in claim 1, which is characterized in that the input impedance of the buffer be 100M ohms with
On.
3. detection circuit as described in claim 1, which is characterized in that the voltage measurement module includes the first buffer, the
Two buffers, voltage measurement unit and measurement calibration unit, in which:
First buffer is for configuring input impedance and common mode inhibition, and first buffer and second divider are simultaneously
Connection, the measurement calibration unit are connect with first buffer；The measurement calibration unit is for detecting second partial pressure
First signal component of the second frequency on device determines that the circuit of the bleeder circuit is joined according to first signal component
Whether number is abnormal, and the bleeder circuit parameter is corrected when circuit parameter exception.
Second buffer is for configuring the linearity, and second buffer is in parallel with second divider, the voltage
Measuring unit is connect with second buffer；The voltage measurement unit is used to detect described the on second divider
The second signal component of one frequency carries out voltage according to the bleeder circuit parameter after the second signal component and correction
Measurement.
4. detection circuit as claimed in claim 3, which is characterized in that the voltage measurement module further includes that error correction is opened
It closing, the error correction switch is in parallel with second divider, and the error correction switch is connected with first buffer,
The error correction switch carries out positive and negative overturning for that will be linked into the signal of the measurement calibration unit.
5. such as the described in any item detection circuits of Claims 1-4, which is characterized in that the detection circuit further include:
It is inputted in the connecting pin of first divider and second divider, the third signal source with third frequency；
The voltage measurement module is also used to detect the third signal component of the third frequency on second divider, root
Determine whether the circuit parameter of the bleeder circuit is abnormal according to the third signal component.
6. detection circuit as claimed in claim 5, which is characterized in that the measurement calibration unit is specifically used for described first
Signal component and the third signal component are handled, and the range value, phase value and third of the first signal component are respectively obtained
Range value, the phase value of signal component, and according to the variation of the range value of first signal component, the amplitude of the third signal
It is worth at least one of variation, the phase change of first signal component, the phase change of the third signal component to determine
Whether the circuit parameter of the bleeder circuit is abnormal.
7. detection circuit as claimed in claim 5, which is characterized in that the second signal source and third signal source are alternating current
Stream source；The second frequency is identical or not identical with third frequency, and is non-integer multiple with the first frequency.
8. detection circuit as described in claim 1, which is characterized in that second divider, third divider and voltage
Measurement module is device in the piece of integrated circuit, anti-used in first divider and the second signal source generating circuit
Feed resistance is the outer device of piece of integrated circuit.
9. a kind of electric energy computation chip, which is characterized in that the electric energy computation chip includes such as any one of claim 1 to 8 institute
The detection circuit stated；The bleeder circuit is set to outside the electric energy computation chip.
10. a kind of electric energy computation chip, including bleeder circuit, which is characterized in that the electric energy computation chip further includes such as right
It is required that 1 to 8 described in any item detection circuits.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910579839.8A CN110221240A (en) | 2019-06-28 | 2019-06-28 | The detection circuit and electric energy computation chip of bleeder circuit parameter |
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| CN201910579839.8A CN110221240A (en) | 2019-06-28 | 2019-06-28 | The detection circuit and electric energy computation chip of bleeder circuit parameter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051434A (en) * | 2020-08-31 | 2020-12-08 | 国网山东省电力公司电力科学研究院 | Precise alternating current-direct current broadband voltage dividing device and method |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200941600Y (en) * | 2006-08-25 | 2007-08-29 | 王悦 | Difference preamplifier |
| CN103823104A (en) * | 2014-02-24 | 2014-05-28 | 中国航天时代电子公司 | Circuit for measuring positive voltage and negative voltage in automatic ranging mode under single power supply condition |
| CN104270150A (en) * | 2014-09-17 | 2015-01-07 | 东南大学 | High-speed low-power-consumption reference voltage output buffer applied to assembly line analog-digital converter |
| CN106341133A (en) * | 2016-08-18 | 2017-01-18 | 东南大学—无锡集成电路技术研究所 | Dual-channel time interleaved asynchronous assembly line flash analog-to-digital converter |
| CN106357269A (en) * | 2016-09-07 | 2017-01-25 | 复旦大学 | Input buffer for high-speed time-interleaved analog-digital converter |
| CN108089142A (en) * | 2017-12-29 | 2018-05-29 | 深圳市锐能微科技有限公司 | Detection circuit, method and the electric energy computation chip of bleeder circuit parameter |
| CN108233926A (en) * | 2018-01-04 | 2018-06-29 | 电子科技大学 | A kind of hyperfrequency buffer input signal device |
| CN108540134A (en) * | 2018-03-19 | 2018-09-14 | 复旦大学 | A kind of input buffer applied in A/D converter with high speed and high precision |
| CN109104192A (en) * | 2018-07-27 | 2018-12-28 | 北京遥测技术研究所 | A kind of rail-to-rail ADC integrated circuit based on Data Fusion Structure |
| CN109728818A (en) * | 2017-10-27 | 2019-05-07 | 美国亚德诺半导体公司 | Tracking and holding circuit for high speed and staggered ADC |
| CN109791174A (en) * | 2016-08-11 | 2019-05-21 | Lg伊诺特有限公司 | Circuit fault detector, electric vehicle charging controller and fault detection method including it |
| CN210982709U (en) * | 2019-06-28 | 2020-07-10 | 深圳市锐能微科技有限公司 | Detection circuit for parameters of voltage division circuit and electric energy metering chip |
-
2019
- 2019-06-28 CN CN201910579839.8A patent/CN110221240A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200941600Y (en) * | 2006-08-25 | 2007-08-29 | 王悦 | Difference preamplifier |
| CN103823104A (en) * | 2014-02-24 | 2014-05-28 | 中国航天时代电子公司 | Circuit for measuring positive voltage and negative voltage in automatic ranging mode under single power supply condition |
| CN104270150A (en) * | 2014-09-17 | 2015-01-07 | 东南大学 | High-speed low-power-consumption reference voltage output buffer applied to assembly line analog-digital converter |
| CN109791174A (en) * | 2016-08-11 | 2019-05-21 | Lg伊诺特有限公司 | Circuit fault detector, electric vehicle charging controller and fault detection method including it |
| CN106341133A (en) * | 2016-08-18 | 2017-01-18 | 东南大学—无锡集成电路技术研究所 | Dual-channel time interleaved asynchronous assembly line flash analog-to-digital converter |
| CN106357269A (en) * | 2016-09-07 | 2017-01-25 | 复旦大学 | Input buffer for high-speed time-interleaved analog-digital converter |
| CN109728818A (en) * | 2017-10-27 | 2019-05-07 | 美国亚德诺半导体公司 | Tracking and holding circuit for high speed and staggered ADC |
| CN108089142A (en) * | 2017-12-29 | 2018-05-29 | 深圳市锐能微科技有限公司 | Detection circuit, method and the electric energy computation chip of bleeder circuit parameter |
| CN108233926A (en) * | 2018-01-04 | 2018-06-29 | 电子科技大学 | A kind of hyperfrequency buffer input signal device |
| CN108540134A (en) * | 2018-03-19 | 2018-09-14 | 复旦大学 | A kind of input buffer applied in A/D converter with high speed and high precision |
| CN109104192A (en) * | 2018-07-27 | 2018-12-28 | 北京遥测技术研究所 | A kind of rail-to-rail ADC integrated circuit based on Data Fusion Structure |
| CN210982709U (en) * | 2019-06-28 | 2020-07-10 | 深圳市锐能微科技有限公司 | Detection circuit for parameters of voltage division circuit and electric energy metering chip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051434A (en) * | 2020-08-31 | 2020-12-08 | 国网山东省电力公司电力科学研究院 | Precise alternating current-direct current broadband voltage dividing device and method |
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