CN108089142A - 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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- CN108089142A CN108089142A CN201711481016.9A CN201711481016A CN108089142A CN 108089142 A CN108089142 A CN 108089142A CN 201711481016 A CN201711481016 A CN 201711481016A CN 108089142 A CN108089142 A CN 108089142A
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Classifications
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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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- 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
Abstract
The invention belongs to voltage detecting technical fields, 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 the first divider, the second divider and the 3rd divider of series connection, voltage measurement module is parallel on second divider, the detection circuit further includes：Secondary signal source, the 3rd signal source；The voltage measurement module is used to detect the first signal component of the second frequency on second divider in the case of only described first switch access, and the secondary signal component of the 3rd frequency on second divider is detected in the case of only described second switch access, determine whether the circuit parameter of the bleeder circuit is abnormal according to first signal component and the secondary signal component.
Description
Technical field
The invention belongs to voltage detecting technical field more particularly to a kind of detection circuit of bleeder circuit parameter, method and
Electric energy computation chip.
Background technology
In electric power system, the measurement of voltage is typically all to pass through sampling network by voltage attenuation to be measured to analog to digital conversion
Within the input voltage safe range of device (Analog to Digital Converter, ADC), by the transformed numbers of ADC
Output carries out the processing of voltage amplitude and phase into digital processing element.(such as electric power facility monitoring is used in high-acruracy survey
Electricity statistics), ± 0.5% is reached to the precision of measuring instrument.This requires the precision needs of resitstance voltage divider and voltage measurement access
There is enough stability.Accurate voltage measurement requirement selection has good temperature coefficient and high-precision outer component.Selection
Inappropriate outer component can cause the change of sampling network transfer function or the gain of voltage measurement passage to change, this all will
Cause the measurement error of voltage.
However, once the outer component (such as resitstance voltage divider) of piece in sampling network is influenced be subject to various external force, such as electrostatic, mistake
Situations such as voltage, surge, may result in the transfer function variation of voltage measurement passage, voltage measurement error be caused, more into one
Step is combined together the error for causing electrical energy measurement with current measurement.In addition, the development with intelligent electric meter, it is desirable that not only have
There is electrical energy measurement that there is accurately measurement, while it is also desirable to have fault detect, fault location, report ammeter abnormal conditions etc.
Function.
The content of the invention
It is an object of the invention to provide a kind of detection circuit, method and the electric energy computation chip of bleeder circuit parameter, purports
Component change of intrinsic standoff ratio because caused by influencing external force it can not cause to measure outside detection lug solving existing tension measuring circuit
The problem of error and voltage measurement accuracy reduce.
The present invention provides a kind of detection circuit of bleeder circuit parameter, including with the first signal source coupling with first frequency
The bleeder circuit of conjunction, the bleeder circuit include series connection the first divider, the second divider and the 3rd divider, described second
Voltage measurement module is parallel on divider, the detection circuit further includes：
It is inputted in the connecting pin of first divider and second divider, has the by first switch access
The secondary signal source of two frequencies；
It is inputted in the connecting pin of second divider and the 3rd divider, there is institute by second switch access
State the 3rd signal source of the 3rd frequency；
The voltage measurement module is used to detect second divider in the case of only described first switch access
The second frequency the first signal component and second partial pressure is detected in the case of the access of the only second switch
The secondary signal component of the 3rd frequency on device determines institute according to first signal component and the secondary signal component
Whether the circuit parameter for stating bleeder circuit is abnormal.
Further, the voltage measurement module is specifically used for the voltage measurement module specifically for believing described first
Number component and the secondary signal component are handled, and respectively obtain the range value, phase value and the second letter of the first signal component
Range value, the phase value of number component, and according to the ratio of the first signal component amplitude value and the secondary signal range value,
At least one of the phase place change of first signal component, phase place change of the secondary signal component determine the partial pressure
Whether the circuit parameter of circuit is abnormal.
Further, first divider, second divider and the 3rd divider be by resistance, inductance,
The circuit of at least one of capacitance composition.
Further, the feedback resistance used in the either generation circuit of the 3rd signal source of the secondary signal source and institute
The temperature coefficient for stating the first divider is identical.
Further, the secondary signal source and the 3rd signal source are ac current source.
Further, the secondary signal source includes an operational amplifier, the first current mirror pipe, the second current mirror pipe
And the feedback resistance, wherein：
The anti-phase input termination reference voltage of the operational amplifier, output terminate the first current mirror pipe and described
The control terminal of second current mirror pipe, homophase input terminate the cold end of the first current mirror pipe and pass through the feedback
The high potential termination supply voltage of resistance eutral grounding, the first current mirror pipe and the second current mirror pipe, described second
Output terminal of the cold end of current mirror pipe as the secondary signal source.
Further, the 3rd signal source and the secondary signal source are same signal source circuit.
Further, the second frequency and the 3rd frequency are identical or differ, and are non-whole with the first frequency
Several times relation.
Further, second divider, the 3rd divider and voltage measurement module are device in the piece of integrated circuit,
The feedback resistance used in first divider and the secondary signal source either generation circuit of the 3rd signal source is collection
Device outside into the piece of circuit.
Another object of the present invention, which also resides in, provides a kind of detection method of bleeder circuit parameter, including：
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 3rd divider of connection
The secondary signal source with second frequency is accessed by first switch in the first end of second divider, described
The second end of second divider is by threeth signal source of the second switch access with the 3rd frequency；
First of the second frequency on second divider is detected in the case of only described first switch access
Signal component and the 3rd frequency on second divider is detected in the case of the access of the only second switch
Secondary signal component determines the circuit parameter of the bleeder circuit according to first signal component and the secondary signal component
It is whether abnormal.
Another object of the present invention, which also resides in, provides a kind of electric energy computation chip, and the electric energy computation chip includes above-mentioned
Detection circuit；The bleeder circuit is arranged at outside the electric energy computation chip.
Another object of the present invention, which also resides in, 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 and method of above-mentioned bleeder circuit parameter introduce extra source in conventional voltage Measurement channel, borrow
The Given information of alternating message source and certain switching sequence information is helped to come whether the outer component of locating plate breaks down, to reach essence
Determine the function of the position source of trouble.Further, by this detection circuit and method, the piece with identical temperature coefficient is reasonably selected
External resistance (feedback resistance used in the first divider and signal source generating circuit) may be such that measurement electrical voltage system carries temperature
Compensation effect can further improve voltage measurement accuracy, and reduce voltage measurements is influenced by temperature drift.
Description of the drawings
Fig. 1 is the schematic diagram of the detection circuit for the bleeder circuit parameter that first embodiment of the invention provides；
Fig. 2 is the schematic diagram of the detection circuit for the bleeder circuit parameter that second embodiment of the invention provides；
Fig. 3 be bleeder circuit parameter provided in an embodiment of the present invention detection circuit in the second current source Example Principles
Figure；
Fig. 4 be bleeder circuit parameter provided in an embodiment of the present invention detection circuit in bleeder circuit Example Principles figure；
Fig. 5 be bleeder circuit parameter provided in an embodiment of the present invention detection circuit in first switch in the closure state
Schematic diagram when being off with second switch；
When Fig. 6 is off for first switch in the detection circuit of bleeder circuit parameter provided in an embodiment of the present invention
With the structure diagram of second switch in the closure state.
Fig. 7 locates for first switch in the detection circuit of bleeder circuit parameter provided in an embodiment of the present invention and second switch
Schematic diagram when off-state.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, the detection circuit of bleeder circuit parameter provided in an embodiment of the present invention, including with first frequency
The first signal source 201 coupling bleeder circuit 100, the bleeder circuit 100 include series connection the first divider 202, second
203 and the 3rd divider 204 of divider is parallel with voltage measurement module 200 on second divider 203.Detection circuit is also
Including secondary signal source 208a and the 3rd signal source 208b with second frequency.
Secondary signal source 208a is inputted in the connecting pin of first divider 202 and second divider 203, by
First switch 206 accesses；3rd signal source 208b is in the connecting pin of second divider 203 and the 3rd divider 204
Input, it is accessed by second switch 207.Voltage measurement module 200 is used to examine in the case where only described first switch 206 accesses
It first signal component of the second frequency surveyed on second divider 203 and is accessed in only described second switch 207
In the case of detect the secondary signal component of the second frequency on second divider 203, according to first signal
Component determines whether the circuit parameter of the bleeder circuit 100 and the secondary signal source 208a are different with the secondary signal component
Often；Simultaneously it was determined that the circuit parameter (feedback resistance used in signal source generating circuit) of the secondary signal source 208a
It is whether abnormal.
In addition, with reference to figure 1, secondary signal source 208a and the 3rd signal source 208b frequencies may be the same or different, width
Degree may be the same or different；With reference to figure 2, secondary signal source and the 3rd signal source can be that same signal source 208 carries
For.First divider 202, second divider 203 and the 3rd divider 204 are by resistance, inductance, capacitance
The circuit of at least one composition
Referring to Fig. 2, more specifically in embodiment, the detection circuit of bleeder circuit parameter includes being measured voltage Vm
(the first signal source 201)；Bleeder circuit 100 is voltage sample network, by first resistor Rext1(the first divider 202), second
Resistance Rint1(the second divider 203), 3rd resistor Rint2(the 3rd divider 204) is formed, and the presence of sampling network mainly will
The safety that signal to be detected decays to AD conversion unit 205 can be in input range；Voltage measurement module 200 includes analog-to-digital conversion
Unit 205 and digital signal processing unit 209,210, voltage measurement module 200 is not only as measuring signal processing unit, but also conduct
Detect signal processing unit；Sensed signal sources 300 are by sequence switch S1(first switch 206), S2(first switch (second switch
And ac current source V 207)REF/Rext2(secondary signal source 208) is formed, resistance Rext2It is produced for the signal source in secondary signal source 208
The feedback resistance used in raw circuit, in the present invention, detection signal are produced by voltage sample network in modulo unit input terminal
Biopsy surveys signal, and detection signal generates detected value by signal processing unit.
In the present invention, it is measured voltage VmFrequency and ac current source VREF/Rext2Frequency it is different, second frequency
Rate and the 3rd frequency are the non-integral multiple of the first frequency.Such as it is measured voltage VmWhen frequency is 50Hz, alternating current
Source VREF/Rext2Frequency is chosen as 432Hz.Ac current source VREF/Rext2Mainly by reference voltage source, operational amplifier, electric current
Mirror image pipe combines the current source generated with feedback resistance.Actual current source internal circuit can control this current source by switching
Output waveform is AC signal.
First switch 206 and second switch 207 are metal-oxide-semiconductor, are primarily used to the access point of control ac current source, pass through
The sequential that switch signal generator is rationally controlled ensures that first switch 206 and second switch 207 are not closed at.Just
It often can be by first switch 206 and second switch 207 disconnects, it is necessary to which whether detection lug bleeder circuit parameter breaks down during measurement
When be contemplated that and be independently closed first switch 206 and second switch 207.
As a preferred embodiment, the feedback resistance that is used in the signal source generating circuit in the secondary signal source 208
Rext2Internal resistance is identical with the temperature coefficient of first divider 202.It simultaneously can be by feedback resistance Rext2Temperature coefficient support
Disappear the temperature coefficient of the first divider of Measurement channel 202.In this way, the feedback resistance R in secondary signal source 208ext2Piece can be placed on
Outside, main cause is the ac current source by the way that the off chip resistor of arbitrary temp coefficient is selected to can obtain arbitrary temp coefficient.
As a preferred embodiment, voltage measurement module 200 be specifically used for the voltage measurement module 200 be specifically used for pair
First signal component and the secondary signal component are handled, and respectively obtain range value, the phase of the first signal component
Range value, the phase value of value and secondary signal component, and according to the first signal component amplitude value and the secondary signal width
At least one of the ratio of angle value, the phase place change of first signal component, phase place change of the secondary signal component
Determine whether the circuit parameter of the bleeder circuit 100 is abnormal.
With reference to figure 3, as a preferred embodiment, secondary signal source 208 includes an operational amplifier A mp, the first current mirror
As pipe Q1, the second current mirror pipe Q1 and feedback resistance Rext2.With reference to Fig. 1, secondary signal source 208a and the 3rd signal source 208b
For same signal source circuit, you can with identical with secondary signal source 208 in Fig. 3.
The anti-phase input termination reference voltage V of operational amplifier A mpREF, output terminate the first current mirror pipe Q1 and
The control terminal of the second current mirror pipe Q1, homophase input terminate the cold end of the first current mirror pipe Q1 and pass through
The feedback resistance Rext2The high potential termination electricity of ground connection, the first current mirror pipe Q1 and the second current mirror pipe Q1
Output terminal of the cold end of source voltage VCC, the second current mirror pipe Q1 as the secondary signal source 208.It introduces and hands over
Stream current source will not bring any influence to normal voltage measurement, and current source needs to be that high-precision reference voltage divided by resistance come
It generates, and the presence of AD conversion unit 205 inherently needs high precision electro potential source in voltage measurement module 200, so this
Complex circuit designs degree can be greatly reduced, it is only necessary to share this high precision electro potential source.The size of current of current source is moderate
To ensure safe input range of the signal amplitude in AD conversion unit 205 of 205 input port of AD conversion unit.
Second divider 203, the 3rd divider 204 and voltage measurement module 200 are device in the piece of integrated circuit,
First divider 202 and the feedback resistance R in the secondary signal source 208ext2For device outside the piece of integrated circuit.Selection will
The feedback resistance R in secondary signal source 208ext2The main reason for being placed on outside piece is the off chip resistor by selecting arbitrary temp coefficient
It can obtain the current source of arbitrary temp coefficient.It simultaneously can be by feedback resistance Rext2Temperature coefficient carry out offset measurement passage first
Resistance Rext1Temperature coefficient.
With reference to figure 4, bleeder circuit 100 does not limit impedance species, and Z0, Z1, Z2 in below figure can be resistance, electricity
The impedances such as appearance, inductance or combination thereof, such as the impedances such as resistance capacitance parallel connection.If sampling network contains electricity
The components such as appearance, inductance can position the source of trouble by monitoring amplitude and the phase change amount of detection signal simultaneously.
Ac current source is needed by high-precision bandgap voltage reference VREFWith off chip resistor Rext2It realizes, and high-precision
Bandgap voltage reference VREFNecessary to being again ADC, therefore high-precision bandgap voltage reference can be shared directly.Ac current source electricity
Road can be by switching to control the on off state of current source circuit, and the control signal switched is by digital control, so can be square
Just ac current source is generated.
Resistance R in pieceint1With Rint2The reason for selection is placed in piece is to reduce the outer component of piece, more steady with resistance in time slice
It is fixed reliable, it is less prone to failure.Although resistance precision deviation is occurred by manufacturing process in piece, resistance value can be demarcated when dispatching from the factory
Size, in order to follow-up accurate calculating off chip resistor resistance value.
The detection circuit course of work of bleeder circuit parameter：Simply the second divider 203 and the 3rd is may be assumed that in order to derive
The resistance value R of divider 204int1=Rint2, the course of work in fact can be according to switch S1、S2State divide：
Step1：Referring to Fig. 5, switch S1It is closed, S2It disconnects, it is assumed that 208 frequency of secondary signal source is fi, it is assumed that it treats
Survey voltage signal VmIt is that AC signal and frequency are fu, and fi≠fuMeet f simultaneouslyi、fuTwo frequencies cannot there are integral multiple relation,
Hypothesis herein mainly ensures that subsequent AD conversion unit 205 and digital signal processing unit 209,210 processes can be correct
Distinguish the signal amplitude and phase for being unable to Frequency point.
Define the voltage signal that secondary signal source 208 is generated by bleeder circuit 100 in 205 input terminal of AD conversion unit
For U0,fi_1。
Individually calculate the voltage signal (the first signal component) that secondary signal source 208 is generated by bleeder circuit 100
U0,fi_1,
(assuming that Rint1=Rint2)
Step2：Referring to Fig. 6, switch S1It disconnects and being closed, S2It is closed, secondary signal source 208 is still AC signal at this time
And frequency is fi, define high-precision AC current source and pass through the electricity that bleeder circuit 100 is generated in 205 input terminal of AD conversion unit
Pressure signal is U0,fi_2。
Individually calculate the voltage signal (secondary signal component) that secondary signal source 208 is generated by bleeder circuit 100
U0,fi_2。
By the operation of formula 1, formula 2, switch S can be respectively obtained1、S2Ac current source letter when individually opening
Number measurement result, measurement result is divided by twice for order：
Due to second resistance R in circuit designint1It is the resistance of known resistance value in piece, and can essence be known by calibration of dispatching from the factory
True resistance value can draw first resistor R by formula 3ext1Exact value Rext1_real, and be easy to by actual with first resistor
Calibration value relatively show whether this off chip resistor is influenced by various external force and broken down.
By first resistor Rext1Exact value Rext1_realFeedback resistance (the second letter can be obtained by substituting into formula 1 or formula 2
The feedback resistance R used in number source generating circuitext2) exact value Rext2_real, therefore can determine whether feedback resistance Rext2Whether go out
Existing failure.In this way, the outer device of two pieces can detect whether to break down, and the source of trouble can be accurately positioned.
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 pass through
This voltage measuring apparatus and voltage measurement method reasonably select the off chip resistor (R with identical temperature coefficientext1、Rext2), it can
So that measurement electrical voltage system can further improve voltage measurement accuracy with effect temperature compensation, reduce voltage measurements by
The influence of temperature drift.
Wherein, the alternating current source signal of application can be various cyclical signals, for example, sine wave signal, square wave are believed
Number, triangular signal etc..
Furthermore disclosed a kind of detection methods of bleeder circuit parameter, comprise the following steps：
Step 1：The first signal source of first frequency is loaded at the both ends of bleeder circuit；Wherein, the bleeder circuit
The first divider, the second divider and the 3rd divider including series connection
Step 2：The secondary signal with second frequency is accessed by first switch in the first end of second divider
The 3rd signal source with the 3rd frequency is accessed in source in the second end of second divider by second switch；
Step 3：The second frequency on second divider is detected in the case of only described first switch access
The first signal component and detected in the case of the access of the only second switch on second divider the described 3rd
The secondary signal component of frequency；
Step 4：The circuit for determining the bleeder circuit according to first signal component and the secondary signal component is joined
Whether number is abnormal.
In a preferred embodiment, step 4 is specially：
First signal component and the secondary signal component are handled, respectively obtain the width of the first signal component
Angle value, the range value of phase value and secondary signal component, phase value, and according to the first signal component amplitude value and described the
In the ratio of binary signal range value, the phase place change of first signal component, the phase place change of the secondary signal component
Whether at least one circuit parameter for determining the bleeder circuit is abnormal.
The specific embodiment of the detection method of bleeder circuit parameter refer to Fig. 5 and Fig. 6 and its illustrate.
In a preferred embodiment, further include：
The institute on second divider is detected in the case where the first switch and the second switch disconnect access
State the 3rd signal component of first frequency；
The bleeder circuit parameter is calibrated according to first signal component and the 3rd signal component, is specifically basis
First signal component and bleeder circuit parameter described in the ratio value calibration of the 3rd signal component.
Referring to Fig. 7, switch S1、S2It disconnects, then ADC input voltage signals (the 3rd letter obtained through bleeder circuit 100
Number component) be：
(assuming that Rint1=Rint2)
For switching S1、S2Closure, off-state do not change signal V to be detectedmFrequency point is exchanged by partial pressure electricity at it
The voltage signal obtained behind road 100.This characteristic shows can't when carrying out component faults detection outside piece by ac current source
Disturb the measurement of measured signal.
Following formula can be obtained by being divided by by formula 1 and formula 4：To switch S1It is closed, S2The alternating current that ADC quantifies during disconnection
The voltage value of signal frequency point is flowed,For the voltage value of the ADC voltage signal frequency points to be measured quantified.
According to formula 5, reference voltage VREFZero-temperature coefficient is regarded as, if selection has equal temperature coefficient
Off chip resistor Rext1、Rext2, can so be drawn the following conclusions according to formula 5：Voltage V i.e. to be measuredmMeasurement result and introducing
The ratio of the result of ac current signal measurement is temperature independent amount.That is this passes through ac current source signal measurement
As a result the temperature coefficient of voltage signal to be measured can be compensated.This can further improve the precision of voltage detecting, at the same also without
Need to have extremely low temperature coefficient precision resister, it is only necessary to have equal temperature coefficient resistance to.It can be with from formula 5
See, off chip resistor (R of the selection with identical temperature coefficientext1、Rext2), it may be such that the voltage of entire voltage measuring apparatus is surveyed
It measures result and carries effect temperature compensation.If the off chip resistor R that will be solved beforeext1、Rext2Exact value Rext1_real、
Rext2_realIt brings formula 5 into, then can bleeder circuit parameter be calibrated according to Y.
Above-mentioned detection method, can not only the outer component of detection lug whether break down, additionally it is possible to reliablely and stablely positioning therefore
Barrier source, the off chip resistor (R that will be solved beforeext1、Rext2) exact value Rext1_real、Rext2_realIt can be with reference to formula (5)
Directly obtain accurately detection signal (line voltage) VmSize, so according to Y calibrate bleeder circuit parameter.Meanwhile pass through choosing
Select suitable off chip resistor (Rext1、Rext2) (there is identical temperature coefficient), it may be such that entire measuring system has temperature-compensating
Function.
The voltage measuring apparatus is implemented simple, it is only necessary to which two off chip resistors, ac current source can be by high-precision in piece
Benchmark is spent to realize, can so substantially reduce design complexities.
The embodiment of the present invention additionally provides a kind of electric energy computation chip, which includes foregoing detection electricity
Road.In embodiments of the present invention, bleeder circuit is arranged at outside electric energy computation chip.Specifically, detection circuit is integrated in chip
Inside, at this point, the detection circuit of chip internal is not affected by, further, first switch and second switch
On off state voluntarily carries out the switching of on off state after being arranged to be launched in voltage measurement module in advance.
The embodiment of the present invention also proposed another electric energy computation chip, the electric energy computation chip include bleeder circuit with
And the detection circuit as described in foregoing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
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 the first divider, the second divider and the 3rd divider of series connection, on second divider simultaneously
It is associated with voltage measurement module, which is characterized in that the detection circuit further includes：
It is inputted in the connecting pin of first divider and second divider, there is the second frequency by first switch access
The secondary signal source of rate；
It is inputted in the connecting pin of second divider and the 3rd divider, has described the by second switch access
3rd signal source of three frequencies；
The voltage measurement module is used to detect the institute on second divider in the case of only described first switch access
It states the first signal component of second frequency and is detected in the case of only described second switch access on second divider
The 3rd frequency secondary signal component, described divide is determined according to first signal component and the secondary signal component
Whether the circuit parameter of volt circuit is abnormal.
2. detection circuit as described in claim 1, which is characterized in that the voltage measurement module is surveyed specifically for the voltage
Amount module is specifically used for handling first signal component and the secondary signal component, respectively obtains the first signal point
The range value of amount, the range value of phase value and secondary signal component, phase value, and according to the first signal component amplitude value with
The ratio of the secondary signal range value, the phase place change of first signal component, the phase of the secondary signal component become
At least one of change determines whether the circuit parameter of the bleeder circuit is abnormal.
3. detection circuit as described in claim 1, which is characterized in that first divider, second divider and institute
It is the circuit being made of at least one of resistance, inductance, capacitance to state the 3rd divider.
4. detection circuit as described in claim 1, which is characterized in that the production of the secondary signal source either the 3rd signal source
The feedback resistance used in raw circuit is identical with the temperature coefficient of first divider.
5. detection circuit as described in claim 1 or 4, which is characterized in that the secondary signal source and the 3rd signal source is hand over
Flow current source.
6. detection circuit as described in claim 1 or 4, which is characterized in that the secondary signal source include an operational amplifier,
First current mirror pipe, the second current mirror pipe and the feedback resistance, wherein：
The anti-phase input termination reference voltage of the operational amplifier, output terminate the first current mirror pipe and described second
The control terminal of current mirror pipe, homophase input terminate the cold end of the first current mirror pipe and pass through the feedback resistance
The high potential termination supply voltage of ground connection, the first current mirror pipe and the second current mirror pipe, second electric current
Output terminal of the cold end of mirror image pipe as the secondary signal source.
7. detection circuit as claimed in claim 6, which is characterized in that the 3rd signal source and the secondary signal source circuit
For same signal source circuit.
8. detection circuit as described in claim 1, which is characterized in that the second frequency and the 3rd frequency is identical or not phase
Together, and it is non-integer multiple with the first frequency.
9. detection circuit as described in claim 1 or 4, which is characterized in that second divider, the 3rd divider and voltage
Measurement module for integrated circuit piece in device, the generation of first divider, the secondary signal source and the 3rd signal source
The feedback resistance used in circuit is device outside the piece of integrated circuit.
10. a kind of detection method of bleeder circuit parameter, which is characterized in that including：
The first signal source of first frequency is loaded at the both ends of bleeder circuit；Wherein, the bleeder circuit includes series connection
First divider, the second divider and the 3rd divider；
The secondary signal source with second frequency is accessed by first switch in the first end of second divider, described second
The second end of divider is by threeth signal source of the second switch access with the 3rd frequency；
The first signal of the second frequency on second divider is detected in the case of only described first switch access
Component and detect second of the 3rd frequency on second divider in the case of the access of the only second switch
Signal component；
Determine whether the circuit parameter of the bleeder circuit is abnormal according to first signal component and the secondary signal component.
11. detection method as claimed in claim 10, which is characterized in that described according to first signal component and described the
Binary signal component determines whether the parameter of the bleeder circuit is abnormal, is specially：
First signal component and the secondary signal component are handled, respectively obtain the amplitude of the first signal component
Range value, the phase value of value, phase value and secondary signal component, and according to the first signal component amplitude value and described second
In the ratio of signal amplitude value, the phase place change of first signal component, the phase place change of the secondary signal component extremely
Whether a kind of few circuit parameter for determining the bleeder circuit is abnormal.
12. detection method as claimed in claim 10, which is characterized in that further include：
Described the on second divider is detected in the case where the first switch and the second switch disconnect access
3rd signal component of one frequency；
The bleeder circuit parameter is calibrated according to first signal component and the 3rd signal component.
13. a kind of electric energy computation chip, which is characterized in that the electric energy computation chip is included such as any one of claim 1 to 9 institute
The detection circuit stated；The bleeder circuit is arranged at 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 is further included such as right
It is required that 1 to 9 any one of them detection circuit.
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| CN110221240A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | The detection circuit and electric energy computation chip of bleeder circuit parameter |
| CN110221238A (en) * | 2019-06-28 | 2019-09-10 | 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 |
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| CN110231587A (en) * | 2019-06-28 | 2019-09-13 | 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 |
| CN113447698A (en) * | 2021-06-11 | 2021-09-28 | 南方电网数字电网研究院有限公司 | Voltage measurement circuit, method and apparatus |
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| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN110231587A (en) * | 2019-06-28 | 2019-09-13 | 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 |
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