CN110231587A - Detection circuit, method and the electric energy computation chip of bleeder circuit parameter - Google Patents
Detection circuit, method and the electric energy computation chip of bleeder circuit parameter Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title description 5
- 238000005259 measurement Methods 0.000 claims abstract description 104
- 239000000872 buffer Substances 0.000 claims abstract description 39
- 230000002159 abnormal effect Effects 0.000 claims abstract description 18
- 230000005764 inhibitory process Effects 0.000 claims abstract description 11
- 238000012937 correction Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
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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 and DC signal source；DC signal source is used to provide a direct current biasing to the voltage measurement module, 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 belong to voltage detecting technical field more particularly to a kind of detection circuit of bleeder circuit parameter, method and
Electric energy computation 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, in the voltage measuring apparatus that current tape jam detects, it will be special typically after sampling network
Detection signal gives A-D converter (Analog to Digital Converter, ADC), the number after ADC is converted
Output enters the processing that digital processing element carries out voltage amplitude and phase, is become by the amplitude and phase of observation detection signal
Change, it is known that the outer component faults of piece in the outer sampling network of piece, to know voltage measurement error is how many；It also uses simultaneously
This ADC will also carry out normal voltage measurement (in electric energy meter, this voltage measurement result is eventually for electrical energy measurement).But
It is the detection signal for giving ADC and voltage measurement signal not comprising DC component, in the scene for needing DC potential to bias
When, it influences to be measured the measurement accuracy of voltage and the measurement accuracy of fault detection signal.
Summary of the invention
A kind of detection circuit, method and the electric energy computation chip for being designed to provide bleeder circuit parameter of the application, purport
Existing tension measuring circuit is being solved in the scene for needing DC potential to bias, is being measured the measurement accuracy and failure inspection of voltage
Survey the not high problem of the measurement accuracy of signal.
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 detection method of bleeder circuit parameter, comprising:
The first signal source of first frequency is loaded at the both ends of bleeder circuit；Wherein, the bleeder circuit includes string
The first divider, the second divider and the third divider of connection；
In the first connecting pin of second divider, access has the second signal source of second frequency, at described second point
First connecting pin of depressor or second connection end access are for providing the DC signal source of direct current biasing；
The first signal component of the second frequency on second divider is detected, and according to first signal point
Amount determines whether the circuit parameter of the bleeder circuit is abnormal.
The third 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 fourth 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 voltage measurement module of the detection circuit of above-mentioned bleeder circuit parameter has fault detection capability, on the basis of in this
Increase DC signal source, divider resistance string is flowed through by the electric current of DC signal source, is provided to the tension measuring circuit of tape jam
One direct current biasing meets the scene that measuring device needs DC potential to bias, improves the measurement accuracy and failure of voltage measurement
Detect the measurement accuracy of signal.
Detailed description of the invention
Fig. 1 is the module diagram of the detection circuit for the bleeder circuit parameter that the application first embodiment provides；
Fig. 2 is the module diagram of the detection circuit for the bleeder circuit parameter that the application second embodiment provides；
Fig. 3 be Fig. 1 or Fig. 2 shows detection circuit in voltage measurement module first embodiment schematic illustration；
Fig. 4 be Fig. 1 or Fig. 2 shows detection circuit in voltage measurement module second embodiment schematic illustration；
Fig. 5 be Fig. 1 or Fig. 2 shows detection circuit in voltage measurement module 3rd embodiment schematic illustration；
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 3rd embodiment provides；
Fig. 8 is the schematic illustration of the detection circuit for the bleeder circuit parameter that the application fourth 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.
Please refer to Fig. 1 and Fig. 2, the detection circuit for the bleeder circuit parameter that one embodiment of the application provides includes and has the
The bleeder circuit 20 of the first signal source 10 coupling of one frequency, bleeder circuit 20 include 21, second points of concatenated first divider
Depressor 22 and third divider 23 are parallel with voltage measurement module 30 on second divider 22, and detection circuit further includes second
Signal source 40 and DC signal source 50, second signal source 40 are inputted in the connecting pin of the second divider 303 and third divider,
Second signal source 40 has second frequency；DC signal source 50 is in the first connecting pin of the second divider 22 (referring to Fig. 1, i.e.
The connecting pin of first divider 21 and the second divider 22) or second connection end (referring to Fig. 2, i.e. the second divider 22 and
The connecting pin of three divider 23) access, DC signal source 50 is used to provide a direct current biasing to voltage measurement module 30, electric
Pressure measurement module 30 is used to detect the first signal component of the second frequency on the second divider 22, true according to the first signal component
Whether the circuit parameter for determining bleeder circuit 20 is abnormal.Simultaneously it was determined that circuit parameter (the signal source generation in second signal source 40
Feedback resistance used in circuit) it is whether abnormal.
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, direct current signal
Source 50 is DC current source.In addition, being measured voltage VmFrequency it is different from the frequency in second signal source 40, second frequency
One frequency it is non-integral multiple.Such as it is measured voltage VmWhen frequency is 50Hz, 40 frequency of second signal source is chosen as 432Hz.The
Binary signal source 40 is mainly the current source for being combined and being generated with feedback resistance by reference voltage source, operational amplifier, current mirror pipe.
The output waveform that actual current source internal circuit can control this current source by switching is AC signal.First divider 21,
Second divider 22 and third divider 23 are the circuit being made of at least one of resistance, inductance, capacitor, resistance value point
It Wei not Rext1、Rint1、Rint2。
Fig. 1 and Fig. 2 are please referred to, voltage measurement module 30 includes AD conversion unit (ADC) 31 and Digital Signal Processing list
First (device) 32.Specifically, the direct current I of DC signal source 50dcFlow through the first divider 21, the second divider 22 and third partial pressure
After device 23, DC level is generated in two endpoints of input terminal P/N of ADC 31, provides direct current biasing to ADC 31.
The DC level V that the input terminal P/N of ADC 31 is generatedP, dc/VN, dcIt is as follows respectively:
VN, dc=Idc·Rint2
Due in voltage measurement, typically passing through sampling network (bleeder circuit 20) for voltage attenuation to be measured to ADC
Input voltage safe range within, the resistance value R of common first divider 21ext1For 1M ohms, the second divider 22 and
The resistance value R of three divider 23inti/Rint2For 1K ohms, therefore the direct current of the input terminal P/N of ADC 31 is poor are as follows:
Therefore VP, dc/VN, dcThe DC voltage value of the two is close, can provide suitable direct current biasing to ADC 31.
Direct current existing for input terminal P/N for ADC 31 is poor, because digital signal processing unit 31 can be in the part DC
Doing direct current difference existing for the input terminal P/N of a high-pass filter elimination DC component ADC 31 will not influence fault detection circuit
Measurement accuracy and tension measuring circuit measurement accuracy, while be able to satisfy measuring device need DC potential bias scene,
Improve the measurement accuracy of voltage measurement and the measurement accuracy of fault detection signal.
Referring to Fig. 3, in another embodiment, voltage measurement module 30 include buffer 33, AD conversion unit 31,
Digital signal processing unit 32.Buffer 33 is used to configure 33 voltage of buffer of input impedance, common mode inhibition and the linearity
Measurement module 30 is while measuring fault detection signal (the first signal component), it is also desirable to detect the second divider 22
On first frequency second signal component (voltage measurement signal), also according to the first signal component and second signal component correction
The circuit parameter of bleeder circuit 20, and carried out normally according to the circuit parameter of the bleeder circuit 20 after second signal component and correction
Voltage measurement.As an embodiment, the internal resistance R_in of buffer 33 is more than 100M ohms, such as in 200M~300M
Between ohms.Voltage measurement module 30 has added a high input impedance/high common mode inhibition/high linearity buffer 33, can be with
Detection signal is eliminated with detection circuit internal resistance variation and the phenomenon that acute variation, while can inhibit to detect the common mode of signal
Part, and meet the linearity of detection circuit.It ensure that the measurement accuracy of detection signal, and can satisfy progress electricity
Linearity when pressure 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 measuredmBe AC signal and
Frequency is fu, and fi ≠ fu, 33 input impedance of buffer are defined as Rin。
Second signal source 40 is defined by bleeder circuit 20 is in the voltage signal that the input terminal of buffer 33 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 ADC
Within 31 input voltage safe range, the resistance value R of common first divider 21ext1For 1M ohms, 22 He of the second divider
The resistance value R of third divider 23int1、Rint2For 1K ohms, if buffer internal resistance RinBecome between 200M~300M ohms
Change (worst buffer internal resistance variation range), then detects the differential voltage part U of signal0, fi_1dmChange and has been 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 of common first divider 21, the second divider 22 and third divider 23 and buffer 33
RinValue, available U0, fi_12000 times higher than differential signal of common-mode signal or more, therefore buffer 33 requires the common mode of itself
Rejection ability is very strong, can both eliminate the common mode value of detection signal, guarantees the detection signal of 31 input terminal of AD conversion unit only
There is differential part, to mitigate the common mode inhibition requirement of AD conversion unit 31；Simultaneous buffering device itself will not believe detection
Number common mode be partially converted into differential signal.Buffer features described above ensure that the not examined signal of measurement accuracy of detection signal
The influence of common mode part.
Simultaneous buffering device 33 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 calibrated 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 to calibrate the bleeder circuit parameter according to the first signal component and second signal component.304 basis of voltage measurement unit
Bleeder circuit parameter after second signal component and calibration 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
Divider 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 survey
The signal for measuring the analog-digital converter of calibration unit 304 carries out positive and negative overturning.Referring to Fig. 6, when band measurement calibration unit 303 is opened
When calibration function, positive negative input of the error correction switch 305 in T1 period and the time end T2 exchange measurement calibration unit 303
End, is named as V in the detection signal of the input terminal of measurement calibration unit 303edt, Fig. 6 shows measurement calibration unit 303
VedtThe V of waveform and voltage measurement module 30mWaveform, from fig. 6, it can be seen that when measurement calibration unit 303 is to VedtSignal carries out
Timing, the V of voltage measurement module 30mSignal is entirely unaffected by, and can work normally, therefore nor affects on final electric energy meter
Electrical energy measurement.
Fig. 7 and Fig. 8 are please referred to, detection circuit further includes having the third signal source 60 of third frequency.Third signal source 60
It is inputted in the connecting pin of the first divider 21 and the second divider 22；Measurement calibration unit 303 is also used to detect the second divider
The third signal component of third frequency on 22 determines whether the circuit parameter of bleeder circuit is abnormal according to third signal component.
As another embodiment, third signal source 60 and second signal source 40 are the same signal source, by another branch first
The input of the connecting pin of divider 21 and the second divider 22.
As a preferred embodiment, measurement calibration unit 303 is specifically used for the first signal component and third signal component
It is handled, respectively obtains the range value of the first signal component, the range value of phase value and third signal component, phase value, and
According to the variation of the range value of the first signal component, the range value variation of third signal, the phase change of the first signal component, third
At least one of phase change of signal component determines whether the circuit parameter of bleeder circuit 20 is abnormal.
Third signal source 60 is also ac current source, and second signal source 40 and 60 frequency of third signal source can be identical,
Can be different, amplitude may be the same or different.
60/ 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 60 is ac current source, is measured
Voltage VmFrequency it is different from the frequency of third signal source 60, third frequency be first frequency it is non-integral multiple.Such as it is measured
Voltage VmWhen frequency is 50Hz, 60 frequency of third signal source is chosen as 432Hz.Third signal source 60 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.
As an embodiment, second signal source 40, third signal source 60 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 60 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 60 is the piece of integrated circuit
Outer device.The main reason for feedback resistance in second signal source 40, third signal source 60 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, as the divider 21,22,23 in Fig. 1,2,7 and 8 can be resistance,
The impedances such as capacitor, inductance are also possible to the impedances such as their combination, such as resistance capacitance parallel connection.If sampling network contains
The components such as capacitor, inductance, 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 detection methods of bleeder circuit parameter, comprising:
Step 1:
The first signal source of first frequency is loaded at the both ends of bleeder circuit；Wherein, the bleeder circuit includes string
The first divider, the second divider and the third divider of connection；
Step 2:
In the first connecting pin of second divider, access has the second signal source of second frequency, at described second point
First connecting pin of depressor or second connection end access are for providing the DC signal source of direct current biasing；
Step 3:
The first signal component of the second frequency on second divider is detected, and according to first signal point
Amount determines whether the circuit parameter of the bleeder circuit is abnormal.
In further embodiment, when carrying out step 3: second frequency on detection second divider
When the first signal component of rate, using buffer to first signal component carry out configuration input impedance, common mode inhibition and
Linearity configuration.
In further embodiment, detection method further include:
Detect the second signal component of the first frequency on second divider；
The bleeder circuit parameter is calibrated according to first signal component and the second signal component.
In further embodiment, detection method is also further include:
There is the third signal source of third frequency in the second connection end access of second divider；
The third signal component for detecting the third frequency on second divider, according to the third signal component
Determine whether the circuit parameter of the bleeder circuit is abnormal.
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 voltage measurement module of the detection electricity of above-mentioned bleeder circuit parameter has fault detection capability, increases on the basis of in this
Add DC signal source, divider resistance string is flowed through by the electric current of DC signal source, provides one to the voltage measurement module of tape jam
A direct current biasing meets the scene that measuring device needs DC potential to bias, and improves the measurement accuracy and failure inspection of voltage measurement
Survey the measurement accuracy of signal.
In addition, increasing a buffer in input side, buffer can be arranged to the characteristic with high input impedance, can be with
Eliminate the limited influence to fault detection signal precision of ADC internal resistance；The characteristic with high common mode inhibition can also be arranged in buffer, can
To inhibit the common mode part of detection signal, the fault detection signal at the output (input of ADC) of high common mode buffer ensure that
No longer there is high common-mode signal to improve the measurement accuracy of fault detection signal to alleviate the common mode inhibition pressure of ADC；
The characteristic with high linearity can be arranged in simultaneous buffering device, it is ensured that voltage measuring apparatus is in the measured voltage to strong amplitude
Linearity when signal 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 (14)
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:
It is inputted in the connecting pin of second divider and the third divider, the second signal source with second frequency；
In the DC signal source that the first connecting pin of second divider or second connection end are accessed, the DC signal source is used
In to the voltage measurement module provide a direct current biasing；
The voltage measurement module is 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.
2. detection circuit as described in claim 1, which is characterized in that the voltage measurement module input terminal is arranged for configuring
Input impedance, common mode inhibition and the linearity buffer.
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 calibrated 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 calibration
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 voltage measurement module 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 DC signal source are branch current source；The second frequency is identical or not identical with third frequency, and with it is described
First frequency is non-integer multiple.
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 detection method of bleeder circuit parameter characterized by comprising
The first signal source of first frequency is loaded at the both ends of bleeder circuit；Wherein, the bleeder circuit includes concatenated
First divider, the second divider and third divider；
In the first connecting pin of second divider, access has the second signal source of second frequency, in second divider
The first connecting pin or second connection end access for providing the DC signal source of direct current biasing；
The first signal component of the second frequency on second divider is detected, and true according to first signal component
Whether the circuit parameter of the fixed bleeder circuit is abnormal.
10. detection method as claimed in claim 9, which is characterized in that described on detection second divider
When the first signal component of second frequency, configuration input impedance is carried out to first signal component using buffer, common mode presses down
System and linearity configuration.
11. detection method as claimed in claim 9, which is characterized in that further include:
Detect the second signal component of the first frequency on second divider；
The bleeder circuit parameter is calibrated according to first signal component and the second signal component.
12. detection method as claimed in claim 9, which is characterized in that further include:
There is the third signal source of third frequency in the second connection end access of second divider；
The third signal component for detecting the third frequency on second divider is determined according to the third signal component
Whether the circuit parameter of the bleeder circuit is abnormal.
13. 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.
14. 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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