CN109188074A - A kind of biradical standard is mutual to examine circuit, method and electric energy computation chip - Google Patents
A kind of biradical standard is mutual to examine circuit, method and electric energy computation chip Download PDFInfo
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- CN109188074A CN109188074A CN201811185283.6A CN201811185283A CN109188074A CN 109188074 A CN109188074 A CN 109188074A CN 201811185283 A CN201811185283 A CN 201811185283A CN 109188074 A CN109188074 A CN 109188074A
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
This application involves integrated circuit fields, disclose the biradical quasi- mutually inspection circuit of one kind, method and electric energy computation chip.This biradical quasi- mutually inspection circuit includes reference power supply, export the reference clock of second clock signal, voltage-frequency conversion module, with frequency processing comparison module, the voltage signal for being originated from reference power supply is converted into the first clock signal by voltage-frequency conversion module, and to this first clock signal and the frequency from reference clock is compared processing, whether shifted with the determination reference power supply or reference clock.The application ensure that the reliability of electric energy computation chip by the mutual detection of reference power supply and the voltage-frequency of reference clock.
Description
Technical field
This application involves integrated circuit fields, in particular to a kind of biradical quasi- mutually inspection circuit, method and electric energy computation chip.
Background technique
In current circuit system, analog-to-digital conversion (referred to as: ADC) is ubiquitous, and ADC can be by the various data of the Nature
Quantified, and the reference voltage of each ADC whether accurately play the role of to ADC precision it is vital, if the reference of ADC
Voltage inaccuracy, even if the precision of this ADC is high again, the result converted is also all inaccurate.
Meanwhile in integrated circuit system, reference clock is exactly the heart of computer system, and performance and stability are direct
Decide the performance of entire hardware system.It is kept between the clock signal of the clock signal and CPU of each chip and external equipment
Stringent synchronized relation, once clock frequency changes, directly affects entire control system to guarantee to properly switch data
Performance, especially influence metering system metering accuracy.
So, in same system, while when there is ADC reference voltage and reference clock frequency signal, how
Guarantee that ADC reference voltage is reliable and stable? how to guarantee that electric energy computation chip reference clock is reliable and stable? here it is us to want today
It solves the problems, such as.
Summary of the invention
The application's is designed to provide the biradical quasi- mutually inspection circuit of one kind, method and electric energy computation chip, for determining base
The offset problem of the frequency of the voltage or reference clock of quasi- power supply.
To solve the above-mentioned problems, this application discloses a kind of reference clocks and reference power supply mutually to examine circuit, comprising: benchmark
Power supply exports the reference clock of second clock signal, voltage-frequency conversion module and frequency processing comparison module；
The reference power supply is coupled to the voltage-frequency conversion module；The reference clock and the voltage-frequency conversion module are respectively coupled to this
Frequency processing comparison module；
The voltage-frequency conversion module is used to the voltage signal for being originated from the reference power supply being converted to the first clock signal；
The frequency processing comparison module is for being compared processing to the frequency of first and second clock signal, with determination
Whether the voltage of the reference power supply or the frequency of reference clock shift.
In a preferred example, which is reference voltage source；Alternatively, the reference power supply is reference current source, this is
System further includes the resistor in parallel with the reference current source, and the voltage signal which generates is coupled to the voltage-frequency modulus of conversion
Block.
In a preferred example, which further comprises frequency dividing submodule and Comparative sub-module；
The frequency dividing submodule is coupled with the voltage-frequency conversion module, for dividing to first clock signal；
The Comparative sub-module is used in a cycle of the first clock signal after frequency dividing to the second clock signal
Period is counted, and judges whether the variation of count results is more than preset threshold, if it exceeds then exporting indicates benchmark electricity
The signal whether source or reference clock shift.
Disclosed herein as well is a kind of reference clocks and the mutual detecting method of reference power supply, comprising:
The voltage signal for being originated from reference power supply is converted into the first clock signal by the voltage-frequency conversion module；
To first clock signal and the frequency from reference clock is compared processing, to determine the reference power supply or base
Whether punctual clock shifts.
In a preferred example, frequency of the comparison process module to first clock signal and the frequency from reference clock
It is compared processing, further comprises:
First clock signal is divided by dividing submodule；
The period of the second clock signal is counted in a cycle of the first clock signal after frequency dividing, and is sentenced
Whether the variation of disconnected count results is more than preset threshold, if it exceeds then exporting indicates whether the reference power supply or reference clock are sent out
The signal of raw offset.
Disclosed herein as well is a kind of electric energy metered systems, comprising:
Analog-to-digital conversion module, for input electric current and voltage signal carry out analog-to-digital conversion respectively；
Signal processing module is coupled with the analog-to-digital conversion module, the electric current for being exported according to the analog-to-digital conversion module and
The value of voltage carries out electrical energy measurement；
Reference power supply, for providing reference voltage to analog-to-digital conversion module；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with the reference power supply, for the voltage signal for being originated from the reference power supply to be converted to
One clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for first He
Whether the frequency of second clock signal is compared processing, occurred with the frequency of the voltage of the determining reference power supply or reference clock
Offset.
In a preferred example, which further includes the external interface coupled with the signal processing module, this is outer
Portion's interface is used to carry out communication connection with external system or equipment；The voltage-frequency conversion module is coupled to the signal processing module, uses
In the comparison processing result is output to the signal processing module.
Disclosed herein as well is a kind of current detecting systems, comprising:
Current sampling circuit, the current sampling circuit are coupled with first signal source；
Reference current source circuit, the reference current source circuit are coupled with the current sampling circuit, the reference current source circuit
It further comprise that reference current source and the concatenated sample resistance R0 of the reference current source and frequency control switch form, this takes
Sample resistance both ends export sampling voltage；
Voltage measurement module, for carrying out analog-to-digital conversion and measurement to input voltage；The voltage measurement module further wraps
Include the analog-to-digital conversion module coupled with the current sampling circuit, and the signal processing module coupled with the analog-to-digital conversion module；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with sample resistance R0, and the sampling voltage for that will be originated from sample resistance R0 is converted
For the first clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for first He
Whether the frequency of second clock signal is compared processing, occurred with the frequency of the voltage of the determining reference power supply or reference clock
Offset.
In a preferred example, the control sequential of the frequency control switch is provided by the reference clock；The voltage-frequency conversion module
It is coupled to the signal processing module, for the comparison processing result to be output to the signal processing module.
Disclosed herein as well is a kind of electric energy computation chip, which includes reference clock as previously described
Circuit is mutually examined with reference power supply.
Compared with prior art, the innovative point of the application is: creatively propose by a reference source of voltage and frequency into
Row mutually verification.By design, the voltage signal from reference power supply of internal system is converted into frequency signal, this frequency letter
Number and the frequency of the frequency signal from reference clock be compared, determine the voltage of reference power supply or the frequency of reference clock
Offset problem, and this design can be applied to simultaneous in the control system of reference power supply and reference clock, only by controlling
Chip interior processed increases voltage-frequency conversion circuit and comparison process module, does not increase system cost additionally.
The application ensure that electric energy computation chip by the mutual detection of reference power supply and the voltage-frequency of reference clock
Reliability.
A large amount of technical characteristic is described in the description of the present application, is distributed in each technical solution, if to enumerate
Out if the combination (i.e. technical solution) of all possible technical characteristic of the application, specification can be made excessively tediously long.In order to keep away
Exempt from this problem, each technical characteristic disclosed in the application foregoing invention content, below in each embodiment and example
Each technical characteristic disclosed in disclosed each technical characteristic and attached drawing, can freely be combined with each other, to constitute each
The new technical solution (these technical solutions have been recorded because being considered as in the present specification) of kind, unless the group of this technical characteristic
Conjunction is technically infeasible.For example, disclosing feature A+B+C in one example, spy is disclosed in another example
A+B+D+E is levied, and feature C and D are the equivalent technologies means for playing phase same-action, it, can not as long as technically selecting a use
Can use simultaneously, feature E can be technically combined with feature C, then, and the scheme of A+B+C+D because technology is infeasible should not
It is considered as having recorded, and the scheme of A+B+C+E should be considered as being described.
Detailed description of the invention
Fig. 1 is mutually to examine circuit block diagram according to a kind of reference clock and reference power supply of the application first embodiment
Fig. 2 is a kind of electric energy metered system circuit block diagram without mutual checking functions
Fig. 3 is a kind of electric energy metered system circuit block diagram according to the application third embodiment
Fig. 4 is a kind of current detection circuit without mutual checking functions
Fig. 5 is a kind of current detecting system circuit block diagram according to the 4th embodiment of the application
Fig. 6 is a kind of current detecting system circuit block diagram according to the 5th embodiment of the application
Specific embodiment
In the following description, in order to make the reader understand this application better, many technical details are proposed.But this
The those of ordinary skill in field is appreciated that even if without these technical details and many variations based on the following respective embodiments
And modification, the application technical solution claimed also may be implemented.
Implementation to keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application
Mode is described in further detail.
As shown in Figure 1, the application first embodiment is related to a kind of reference clock and reference power supply mutually examines circuit, comprising:
Reference power supply exports the reference clock of second clock signal, voltage-frequency conversion module and frequency processing comparison module；Benchmark electricity
It is coupled to the voltage-frequency conversion module in source；The reference clock and the voltage-frequency conversion module are respectively coupled to the frequency processing and compare mould
Block；The voltage-frequency conversion module is used to the voltage signal for being originated from the reference power supply being converted to the first clock signal；The frequency processing
Comparison module for carrying out processing comparison to the frequency of first and second clock signal, with determine the reference power supply voltage or
Whether the frequency of reference clock shifts.
For reference clock and reference power supply, the probability that the two changes or breaks down simultaneously is minimum, it is believed that
Substantially will not occur, therefore, if biradical quasi- mutually inspection module notes abnormalities, then it is assumed that at least one benchmark is changed, and
Send result to signal processing mould.
Reference power supply can be diversified.Optionally, which is reference voltage source.Optionally, the benchmark
Power supply is reference current source, which further includes the resistor in parallel with the reference current source, the voltage letter which generates
Number it is coupled to the voltage-frequency conversion module.
Optionally, which includes frequency dividing submodule and Comparative sub-module.Specifically, the frequency dividing submodule
Block is coupled with the voltage-frequency conversion module, for dividing to first clock signal；The Comparative sub-module is used for after frequency dividing
The first clock signal a cycle in the period of the second clock signal is counted, and judge the variation of count results
It whether is more than preset threshold, if it exceeds then exporting the signal for indicating whether the reference power supply or reference clock shift.?
In one embodiment, the frequency by the first clock signal of frequency dividing is 10KHz (period T1=0.1ms), and second clock
Signal frequency is 6MHz (period T2=0.000167ms), then with a cycle T of the first clock signal1It is interior to second when
The cycle T of clock signal2It is counted, then n=T1/T2=600.
Assuming that preset threshold is (600 ± 1), if above-mentioned n value changes not in (599~601) range,
It just can determine whether that signal offset problem has occurred in the reference power supply or reference clock.Also, in a certain range, the first clock signal
Frequency and second clock signal frequency difference it is bigger, i.e., n is bigger, and counting precision is higher, and judging result is more accurate.
The frequency processing comparison module set-up mode be it is various, optionally, which is set as comparing
Compared with module；Optionally, which is arranged to include frequency dividing submodule and Comparative sub-module；Optionally, the frequency
Rate processing comparison module is arranged to include frequency multiplication submodule and Comparative sub-module.Specifically, frequency processing comparison module is arranged
Mode and placement location need particular problem specifically to handle, if the frequency of the frequency of the first clock signal and second clock signal
Rate meets the comparison value range of comparison module, then can directly be compared to the frequency of the two, then the frequency processing compares
Module is directly disposed as comparison module；Compared with if the frequency of the first clock signal is not able to satisfy with the frequency of second clock signal
The comparison accuracy rating of module, then can be appropriate before the first clock signal and second clock signal are compared, to
One clock signal or second clock signal carry out frequency dividing or process of frequency multiplication, then the frequency processing comparison module be set to include
Submodule and Comparative sub-module are divided, or including frequency multiplication submodule and Comparative sub-module.
To voltage-frequency conversion module, voltage-frequency conversion module is made of reference power supply output voltage signal voltage to frequency converter,
Alias voltage control oscillating circuit belongs to prior art scope；This voltage-frequency conversion module is by the voltage signal according to certain side
Formula is converted into clock signal, known to the frequency of the clock signal and the voltage signal relationship.
It includes following that the second embodiment of the application, which is related to a kind of reference clock and the mutual detecting method of reference power supply, this method,
Step:
Step 1: the voltage signal for being originated from reference power supply is converted to by the first clock signal by the voltage-frequency conversion module；
Step 2: to first clock signal and the frequency from reference clock is compared processing, to determine the benchmark
Whether power supply or reference clock shift.
Optionally, frequency of the comparison process module to first clock signal and the frequency from reference clock compare
Further comprise step compared with processing: (1) first clock signal being divided by dividing submodule；(2) after frequency dividing
The period of the second clock signal is counted in a cycle of first clock signal, and judges that the variations of count results is
No is more than preset threshold, if it exceeds then exporting the signal for indicating whether the reference power supply or reference clock shift.
Reference clock and reference power supply, the probability that the two changes or breaks down simultaneously are minimum, it is believed that basic
It will not occur, therefore, if biradical quasi- mutually inspection module notes abnormalities, then it is assumed that at least one benchmark is changed, and will knot
Fruit is sent to signal processing module.
Second embodiment is method implementation corresponding with first embodiment, the skill in the two embodiments
Art details can be used mutually, in order to keep the succinct of specification, be not repeated here and illustrate.
Fig. 2 is the schematic diagram of most common electrical energy measurement scheme, which includes reference clock, ADC benchmark, modulus
Conversion module, signal processing module and external interface.Reference clock is the clock of metering chip, is generally mentioned by external high frequency crystal oscillator
For that can also be generated by internal RC module, be connected to analog-to-digital conversion module, signal processing module and external interface, there is benchmark
Clock signal, these modules could operate normally；ADC benchmark provides the base of high-precision, high stability for analog-to-digital conversion module
Quasi- voltage Vref；For single-phase, analog-to-digital conversion module contains two-way ADC, by power network current and voltage signal by analog quantity
It is converted into digital quantity I and U and is input to signal processing module；Signal processing module receives U and I and carries out electrical energy measurement, while also having
Have and the external function of carrying out information interchange；External interface includes electrical energy pulse mouth and communication interface etc..
The data that signal processing module is obtained according to analog-to-digital conversion module discretization, using phasing, HPF is (high
It is logical), multiplier, LPF (low pass) calculates the active-power P power reactive power Q power and virtual value of I electric current, U voltage
Rms,.Wherein active power calculates formula P=UIcos φ, Q=UIsin φ.After obtaining power, according to ENERGY E=P × t=
∫ Pdt, discretization are then E=∑ P Δ t, and wherein Δ t is fixed as sample rate 1/fs, then ENERGY E is cumulative for power P/Q, will be instantaneous
Performance number passes through pulse accumulation generator, that is, can produce pf (active energy pulse) and qf (quadergy pulse), i.e., active electricity
Energy and reactive energy.The Irms current effective value obtained is multiplied with Urms voltage effective value and obtains Spower (apparent energy wink
Duration), calculation formula S=Urms*Irms, apparent energy S are obtained sf (apparent energy pulse) by pulse accumulation generator, i.e.,
To regard in electric energy.
Since the method for metering electric energy is to be added up with frequency fs to performance number, the precision of electrical energy measurement is directly by benchmark
The influence of clock frequency fs and ADC precision, and ADC conversion accuracy is influenced by ADC reference voltage Vref.In practical applications,
It is protected from environmental, if the oscillating circuit parameter of reference clock is changed, will lead to reference clock frequency and change correspondingly,
Equally, if the external capacitive C0 parameter of Vref circuit is changed, Vref can also change, no matter it is above-mentioned which kind of variation
Occur, finally will lead to metering and error occur.
To solve the above-mentioned problems, as shown in figure 3, the application third embodiment is related to the one of above-mentioned electric energy metered system
Kind has the electric energy metered system of mutual checking functions, comprising:
Analog-to-digital conversion module, for input electric current and voltage signal carry out analog-to-digital conversion respectively；
Signal processing module is coupled with the analog-to-digital conversion module, the electric current for being exported according to the analog-to-digital conversion module and
The value of voltage carries out electrical energy measurement；
ADC benchmark, for providing reference voltage to analog-to-digital conversion module；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with the reference power supply, for the voltage signal for being originated from the reference power supply to be converted to
One clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for first He
Whether the frequency of second clock signal is compared processing, occurred with the frequency of the voltage of the determining reference power supply or reference clock
Offset.
Optionally, which further includes the external interface coupled with the signal processing module, the external interface
For carrying out communication connection with external system or equipment；
Optionally, which is coupled to the signal processing module, for the comparison processing result to be output to
The signal processing module.
Optionally, which includes frequency dividing submodule and Comparative sub-module.Specifically, the frequency dividing submodule
Block is coupled with the voltage-frequency conversion module, for dividing to first clock signal；The Comparative sub-module is used for after frequency dividing
The first clock signal a cycle in the period of the second clock signal is counted, and judge the variation of count results
It whether is more than preset threshold, if it exceeds then exporting the signal for indicating whether the reference power supply or reference clock shift.
The frequency processing comparison module set-up mode be it is various, optionally, which is set as comparing
Compared with module；Optionally, which is arranged to include frequency dividing submodule and Comparative sub-module；Optionally, the frequency
Rate processing comparison module is arranged to include frequency multiplication submodule and Comparative sub-module.Specifically, frequency processing comparison module is arranged
Mode and placement location need particular problem specifically to handle, if the frequency of the frequency of the first clock signal and second clock signal
Rate meets the comparison value range of comparison module, then can directly be compared to the frequency of the two, then the frequency processing compares
Module is directly disposed as comparison module；Compared with if the frequency of the first clock signal is not able to satisfy with the frequency of second clock signal
The comparison accuracy rating of module, then can be appropriate before the first clock signal and second clock signal are compared, to
One clock signal or second clock signal carry out frequency dividing or process of frequency multiplication, then the frequency processing comparison module be set to include
Submodule and Comparative sub-module are divided, or including frequency multiplication submodule and Comparative sub-module.
To voltage-frequency conversion module, voltage-frequency conversion module is made of reference power supply output voltage signal voltage to frequency converter,
Alias voltage control oscillating circuit belongs to prior art scope.
In the application third embodiment, ADC benchmark (being equivalent to the reference power supply in first embodiment), voltage-frequency conversion
Module, processing comparison module and reference clock constitute the biradical quasi- mutually inspection circuit and second in the application first embodiment in fact
The method in mode is applied, this biradical quasi- mutually inspection circuit and approach application are effectively increased into this electric energy into electric energy metered system
The reliability of reference clock and ADC module reference voltage source in metering system, solves because of external capacitor C0 in system
Caused by Parameters variation the problem of measurement error.
Fig. 4 is a kind of current detection circuit with electric current self-calibration function without mutually examining ability, and the device is by benchmark
Clock, current sampling circuit, analog-to-digital conversion module (ADC), reference current source and signal processing module composition.Reference clock is
ADC and signal processing module provide reference clock signal, and reference current source generates and the reference current of power network current different frequencies, should
Reference current and power network current act on R1 simultaneously, generate sampled voltage, which is converted into digital signal by ADC
It is input to signal processing module, signal processing module isolates power network current signal in output voltage and reference current signal
Come, finally determines grid current value, while judging whether the parameter of current sampling circuit is changed.
Above-mentioned current detection circuit, self calibration principle is invariable based on reference power supply, if reference power supply occurs
Offset, then will appear the calibration result of mistake, and electric energy is caused to miss measurement problem.In addition, if reference clock is changed, root
According to analysis above, also results in electrical energy measurement and error occur.
As shown in figure 5, the application the 4th embodiment is related to a kind of with mutual checking functions of above-mentioned current detection circuit
Current detecting system, this system include:
Current sampling circuit, the current sampling circuit are coupled with first signal source, by the current signal of the first signal source
It is converted into sampled voltage signal；
Reference current source circuit, the reference current source circuit are coupled with the current sampling circuit, the reference current source circuit
It further comprise that reference current source and the concatenated sample resistance R0 of the reference current source and frequency control switch form；
Voltage measurement module, for carrying out analog-to-digital conversion and measurement to input voltage；The voltage measurement module further wraps
Include the analog-to-digital conversion module coupled with the current sampling circuit, and the signal processing module coupled with the analog-to-digital conversion module；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with sample resistance R0, and the sampling voltage for that will be originated from sample resistance R0 is converted
For the first clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for first He
Whether the frequency of second clock signal is compared processing, occurred with the frequency of the voltage of the determining reference power supply or reference clock
Offset.
Optionally, which includes frequency dividing submodule and Comparative sub-module.Specifically, the frequency dividing submodule
Block is coupled with the voltage-frequency conversion module, for dividing to first clock signal；The Comparative sub-module is used for after frequency dividing
The first clock signal a cycle in the period of the second clock signal is counted, and judge the variation of count results
It whether is more than preset threshold, if it exceeds then exporting the signal for indicating whether the reference power supply or reference clock shift.
The frequency processing comparison module set-up mode be it is various, optionally, which is set as comparing
Compared with module；Optionally, which is arranged to include frequency dividing submodule and Comparative sub-module；Optionally, the frequency
Rate processing comparison module is arranged to include frequency multiplication submodule and Comparative sub-module.Specifically, frequency processing comparison module is arranged
Mode and placement location need particular problem specifically to handle, if the frequency of the frequency of the first clock signal and second clock signal
Rate meets the comparison value range of comparison module, then can directly be compared to the frequency of the two, then the frequency processing compares
Module is directly disposed as comparison module；Compared with if the frequency of the first clock signal is not able to satisfy with the frequency of second clock signal
The comparison accuracy rating of module, then can be appropriate before the first clock signal and second clock signal are compared, to
One clock signal or second clock signal carry out frequency dividing or process of frequency multiplication, then the frequency processing comparison module be set to include
Submodule and Comparative sub-module are divided, or including frequency multiplication submodule and Comparative sub-module.
Optionally, copper-manganese can be used in the current sampling circuit or current transformer carries out current sample, in mutual inductance
The secondary side of device can be the circuit being made of at least one of resistance, inductance, capacitor, obtain sampled voltage.Use electric current
It is the mature prior art that mutual inductor, which carries out current sample, is just no longer described in detail in the application.
Optionally, the control sequential of the frequency control switch is provided by the reference clock；
Optionally, which is coupled to the signal processing module, for the comparison processing result to be output to
The signal processing module.
To voltage-frequency conversion module, voltage-frequency conversion module is made of reference power supply output voltage signal voltage to frequency converter,
Alias voltage control oscillating circuit belongs to prior art scope
In the 4th embodiment of the application, sampling voltage (being equivalent to the reference power supply in first embodiment), voltage-frequency turn
Mold changing block, processing comparison module and reference clock constitute the biradical quasi- mutually inspection circuit and second in the application first embodiment
This biradical quasi- mutually inspection circuit and approach application are effectively increased this electric current to current detecting system by the method in embodiment
The reliability of detection system calibrates knot caused by solving this system due to reference power supply shifts or reference clock is unstable
Fruit mistake, so as to cause electric energy error count amount the problem of.
As shown in fig. 6, the 5th implementation method of the application is related to a kind of current detection circuit, this 5th embodiment is at this
Apply increasing ADC benchmark on the basis of the 4th embodiment.
This ADC benchmark is coupled to analog-to-digital conversion module (ADC), for providing reference voltage to ADC；
This ADC benchmark is coupled to voltage-frequency conversion module, this voltage-frequency conversion module believes ADC Reference Transforming at third clock
Number, processing comparison module by third clock signal be derived from reference clock second clock signal carry out processing compared with, with
Whether the frequency of the voltage or reference clock that determine the ADC benchmark shifts.
In conjunction with the 4th embodiment, the 5th embodiment is provided with two groups of mutual calibration functions inside current detecting system
Block is respectively as follows: the mutual calibration function block of sampling voltage-reference clock, the mutual calibration function block of ADC benchmark-reference clock, specifically,
Sampling voltage (reference power supply being equivalent in first embodiment), voltage-frequency conversion module, processing in present embodiment compare
Module and reference clock constitute the side in biradical quasi- mutually inspection circuit and second embodiment in the application first embodiment
Method, at the same time, ADC benchmark (being equivalent to the reference power supply in first embodiment), voltage-frequency modulus of conversion in present embodiment
Block, processing comparison module, reference clock also constitute the biradical quasi- mutually inspection circuit and second in the application first embodiment in fact
Apply the method in mode.
To sum up, the 5th embodiment of the application effectively raises the reliability of this current detecting system, solves this and is
System is because caused by reference power supply shifts, ADC benchmark shifts or reference clock is unstable the problem of electric energy error count amount.
Optionally, the mutual calibration function block of sampling voltage-reference clock and the mutual calibration function block of ADC benchmark-reference clock are total
With a processing comparator module.
The sixth embodiment of the application is related to a kind of electric energy computation chip, which includes as first implements
The reference clock and reference power supply that mode describes mutually examine circuit.
It should be noted that relational terms such as first and second and the like are only in the application documents of this patent
For distinguishing one entity or operation from another entity or operation, without necessarily requiring or implying these entities
Or there are any actual relationship or orders between operation.Moreover, the terms "include", "comprise" or its any other
Variant is intended to non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only
It including those elements, but also including other elements that are not explicitly listed, or further include for this process, method, object
Product or the intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence " including one ", not
There is also other identical elements in the process, method, article or apparatus that includes the element for exclusion.The application of this patent
In file, if it is mentioned that certain behavior is executed according to certain element, then refers to the meaning for executing the behavior according at least to the element, wherein
Include two kinds of situations: executing the behavior according only to the element and the behavior is executed according to the element and other elements.Multiple,
Repeatedly, the expression such as a variety of include 2,2 times, 2 kinds and 2 or more, 2 times or more, two or more.
It is included in disclosure of this application with being considered as globality in all documents that the application refers to, so as to
It can be used as the foundation of modification if necessary.In addition, it should also be understood that, after having read the above disclosure of the application, this field
Technical staff can make various changes or modifications the application, and such equivalent forms equally fall within the application model claimed
It encloses.
Claims (10)
1. a kind of reference clock and reference power supply mutually examine circuit characterized by comprising reference power supply, output second clock letter
Number reference clock, voltage-frequency conversion module and frequency processing comparison module；
The reference power supply is coupled to the voltage-frequency conversion module；The reference clock and the voltage-frequency conversion module couple respectively
To the frequency processing comparison module；
The voltage-frequency conversion module is used to the voltage signal for being originated from the reference power supply being converted to the first clock signal；
The frequency processing comparison module is for being compared processing to the frequency of first and second clock signal, with determination
Whether the voltage of the reference power supply or the frequency of reference clock shift.
2. the biradical mutual check system of standard according to claim 1, which is characterized in that
The reference power supply is reference voltage source；Alternatively,
The reference power supply is reference current source, described the system also includes the resistor in parallel with the reference current source
The voltage signal that resistor generates is coupled to the voltage-frequency conversion module.
3. the biradical mutual check system of standard according to claim 1, which is characterized in that the frequency processing comparison module is further
Including frequency dividing submodule and Comparative sub-module；
The frequency dividing submodule is coupled with the voltage-frequency conversion module, for dividing to first clock signal；
The Comparative sub-module is used in a cycle of the first clock signal after frequency dividing to the second clock signal
Period is counted, and judges whether the variation of count results is more than preset threshold, if it exceeds then exporting indicates the benchmark
The signal whether power supply or reference clock shift.
4. a kind of reference clock and the mutual detecting method of reference power supply characterized by comprising
The voltage signal for being originated from reference power supply is converted into the first clock signal by the voltage-frequency conversion module；To described first
Whether clock signal and frequency from reference clock are compared processing, occurred with the determination reference power supply or reference clock
Offset.
5. the biradical mutual detecting method of standard according to claim 4, which is characterized in that the comparison process module is to described first
The frequency of clock signal and frequency from reference clock are compared processing, further comprise:
First clock signal is divided by dividing submodule；
The period of the second clock signal is counted in a cycle of the first clock signal after frequency dividing, and is judged
Whether the variation of count results is more than preset threshold, if it exceeds then exporting indicates whether the reference power supply or reference clock are sent out
The signal of raw offset.
6. a kind of electric energy metered system characterized by comprising
Analog-to-digital conversion module, for input electric current and voltage signal carry out analog-to-digital conversion respectively；
Signal processing module is coupled with the analog-to-digital conversion module, the electric current for being exported according to the analog-to-digital conversion module and
The value of voltage carries out electrical energy measurement；
ADC benchmark, for providing reference voltage to analog-to-digital conversion module；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with the ADC benchmark, for the voltage signal for being originated from the ADC benchmark to be converted to first
Clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for described first
Be compared processing with the frequency of second clock signal, with the frequency of the voltage of the determination reference power supply or reference clock whether
It shifts.
7. electric energy metered system according to claim 6, which is characterized in that the electric energy metered system further include with it is described
The external interface of signal processing module coupling, the external interface are used to carry out communication connection with external system or equipment；It is described
Voltage-frequency conversion module is coupled to the signal processing module, for the relatively processing result to be output to the signal processing mould
Block.
8. a kind of current detecting system characterized by comprising
Current sampling circuit, the current sampling circuit are coupled with first signal source, and the current signal of the first signal source is turned
Change sampled voltage signal into；
Reference current source circuit, the reference current source circuit are coupled with the current sampling circuit, the reference current source electricity
Road further comprises that reference current source and the concatenated sample resistance R0 of the reference current source and frequency control switch form,
The sample resistance both ends export sampling voltage；
Voltage measurement module, for carrying out analog-to-digital conversion and measurement to input voltage；The voltage measurement module further comprises
The analog-to-digital conversion module coupled with the current sampling circuit, and the signal processing mould coupled with the analog-to-digital conversion module
Block；
Reference clock, for providing second clock signal；
Voltage-frequency conversion module is coupled with the sample resistance R0, and the sampling voltage for that will be originated from the sample resistance R0 is converted
For the first clock signal；
Frequency processing comparison module is coupled with the voltage-frequency conversion module and the reference clock respectively, for described first
Be compared processing with the frequency of second clock signal, with the frequency of the voltage of the determination reference power supply or reference clock whether
It shifts.
9. current detecting system according to claim 8, which is characterized in that the control sequential of the frequency control switch by
The reference clock provides；The voltage-frequency conversion module is coupled to the signal processing module, for tying the relatively processing
Fruit is output to the signal processing module.
10. a kind of electric energy computation chip, which is characterized in that the electric energy computation chip includes such as any one of claim 1-3 institute
The reference clock and reference power supply stated mutually examine circuit.
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