CN107579674A - A kind of method and system for controlling sample circuit zero bias - Google Patents
A kind of method and system for controlling sample circuit zero bias Download PDFInfo
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Abstract
This application discloses a kind of method for controlling sample circuit zero bias, including：The flip-flop that output voltage and output current include in extraction circuit, obtains output voltage DC component and output current DC component；Suppress by PI controllers to sample zero bias existing for the output voltage DC component using the output voltage DC component and the output current DC component.Operational factors of this method using two parameters of output voltage DC component and output current DC component as negative feedback, more preferable negative feedback control effect can be played, mitigates the influence caused by zero bias existing for sample circuit, there is provided more preferable control accuracy.The application further simultaneously discloses a kind of system for controlling sample circuit zero bias, has above-mentioned beneficial effect.
Description
Technical field
The application is related to inverter manufacturing field, more particularly to a kind of method and system for controlling sample circuit zero bias.
Background technology
With greatly developing for New Energy Industry, photovoltaic generation because its cleaning, wide material sources and threshold it is relatively low, by
Gradually it is set to primary study object by all big enterprises and enterprise.Wherein, off-network type photovoltaic is widely used in photovoltaic generation against electrical equipment,
And as the off-network type photovoltaic against an important parameter in electrical equipment, the i.e. research for this parameter of output voltage DC component
Also deploying.
In the off-network type photovoltaic using existing method manufacture against in electrical equipment, output voltage DC component generally is intended to be excluded
A parameter, and due to the inherent characteristic of voltage sampling circuit, cause can have zero bias in voltage sampling circuit, that is,
Say certain output voltage DC component inevitably be present.Prior art is only come by using output voltage DC component
Negative feedback is limited in itself by itself negative feedback effect, can not control caused output electricity well
The precision of straightening flow component is come influence caused by mitigating zero bias.
So how on the premise of voltage sampling circuit is not cancelled, the base of output voltage DC component is still being utilized
On plinth, there is provided sample circuit zero that is a kind of while carrying out negative feedback control to output voltage DC component jointly using other parameters
Inclined controlling mechanism is those skilled in the art's urgent problem to be solved.
The content of the invention
The purpose of the application is to provide a kind of method and system for controlling sample circuit zero bias, and it divides output voltage direct current
Amount and operational factors of two parameters of output current DC component as negative feedback, more preferable negative feedback control can be played and made
With the influence existing for mitigation sample circuit caused by zero bias, there is provided more preferable control accuracy.
In order to solve the above technical problems, the application provides a kind of method for controlling sample circuit zero bias, this method includes：
The flip-flop that output voltage and output current include in extraction circuit, obtains output voltage DC component and output
Current dc component；
Suppress described by PI controllers using the output voltage DC component and the output current DC component
The existing sampling zero bias of output voltage DC component.
Optionally, the flip-flop that output voltage and output current include in circuit is extracted, including：
Low-pass filtering operation is performed to the output voltage and the output current respectively using low pass filter, obtained low
Pass filtering results；
Noise reduction process is carried out to the LPF result, obtains the output voltage DC component and the output voltage
DC component.
Optionally, pressed down using the output voltage DC component and the output current DC component by PI controllers
The existing sampling zero bias of the output voltage DC component are made, including：
The first preset weights and the second preset weights are utilized respectively to the output voltage DC component and the output electricity
Stream DC component is weighted, and is obtained weighting output voltage DC component and is weighted output current DC component；
Controlled using the weighting output voltage DC component and the weighting output current DC component by the PI
To suppress, the output voltage DC component is existing to sample zero bias to device.
Optionally, the first preset weights and the second preset weights are utilized respectively to the output voltage DC component and described
Output current DC component is weighted, including：
Judge whether the value of feedback of the output voltage DC component is more than threshold value；
If so, then controlling first preset weights and the ratio of second preset weights to be at least 3, the first master is obtained
Weights and first are from weights；
Be utilized respectively the described first value with sovereign right and described first from weights to the output voltage DC component and described defeated
Go out current dc component to be weighted；
If it is not, then controlling second preset weights and the ratio of first preset weights to be at least 5, the second master is obtained
Weights and second are from weights；
Be utilized respectively the described second value with sovereign right and described second from weights to the output current DC component and described defeated
Go out voltage DC component to be weighted.
Optionally, control the ratio of second preset weights and first preset weights to be at least 5, obtain the second master
Weights and second from weights, including：
First preset weights are set to 0, second preset weights put 1, obtain for 1 the second value with sovereign right and be 0
Second from weights.
Present invention also provides a kind of system for controlling sample circuit zero bias, the system includes：
Parameter acquisition module, for extracting the flip-flop that output voltage and output current include in circuit, exported
Voltage DC component and output current DC component；
Zero bias suppression module, for passing through PI using the output voltage DC component and the output current DC component
To suppress, the output voltage DC component is existing to sample zero bias to controller.
Optionally, the parameter acquisition module includes：
Low-pass filtering treatment submodule, for utilizing low pass filter respectively to the output voltage and the output current
Low-pass filtering operation is performed, obtains LPF result；
Noise reduction process submodule, for carrying out noise reduction process to the LPF result, it is straight to obtain the output voltage
The output voltage DC component of flow component.
Optionally, the zero bias suppression module includes：
Weight assignment submodule is straight to the output voltage for being utilized respectively the first preset weights and the second preset weights
Flow component and the output current DC component are weighted, and obtain weighting output voltage DC component and weighting output current is straight
Flow component；
Suppress submodule, for utilizing the weighting output voltage DC component and the weighting output current DC component
Suppress to sample zero bias existing for the output voltage DC component by the PI controllers.
Optionally, the weight assignment submodule includes：
Threshold decision unit, for judging whether the value of feedback of the output voltage DC component is more than threshold value；
First processing units, for controlling first preset weights and the ratio of second preset weights to be at least 3,
Obtain value with sovereign right and from weights；
First weighted units, for be utilized respectively the value with sovereign right and it is described from weights to the output voltage DC component
It is weighted with the output current DC component；
Second processing unit, for controlling second preset weights and the ratio of first preset weights to be at least 5,
The second value with sovereign right and second is obtained from weights；
Second weighted units, for be utilized respectively the described second value with sovereign right and described second from weights to the output current
DC component and the output voltage DC component are weighted.
Optionally, the weight assignment submodule includes：
It is preferred that second processing unit, for first preset weights to be set to 0, second preset weights put 1, obtain for
1 the second sovereignty value and for 0 second from weights.
The method of a kind of control sample circuit zero bias provided herein, by extracting output voltage and output in circuit
The flip-flop that electric current includes, obtain output voltage DC component and output current DC component；It is straight using the output voltage
Flow component and the output current DC component suppress sampling existing for the output voltage DC component by PI controllers
Zero bias.
Obviously, technical scheme provided herein, by being extracted in the circuit of composition off-network type photovoltaic DC-to-AC converter
To output voltage DC component and output current DC component, and output voltage direct current point can be reacted on using the two
The parameter of amount, jointly using negative-feedback in reaction and reduction output voltage DC component.This method divides output voltage direct current
Amount and operational factors of two parameters of output current DC component as negative feedback, more preferable negative feedback control can be played and made
With the influence existing for mitigation sample circuit caused by zero bias, there is provided more preferable control accuracy.The application additionally provides one simultaneously
The system of kind control sample circuit zero bias, has above-mentioned beneficial effect, will not be repeated here.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of application, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
A kind of flow chart of the method for control sample circuit zero bias that Fig. 1 is provided by the embodiment of the present application；
The flow chart of the method for another control sample circuit zero bias that Fig. 2 is provided by the embodiment of the present application；
The flow chart of the method for another control sample circuit zero bias that Fig. 3 is provided by the embodiment of the present application；
A kind of structured flowchart of the system for control sample circuit zero bias that Fig. 4 is provided by the embodiment of the present application；
The structured flowchart of the system for another control sample circuit zero bias that Fig. 5 is provided by the embodiment of the present application；
A kind of equivalent circuit diagram for control sample circuit zero bias that Fig. 6 is provided by the embodiment of the present application；
A kind of equivalent circuit diagram for off-network type photovoltaic DC-to-AC converter that Fig. 7 is provided by the embodiment of the present application；
A kind of model schematic for off-network type photovoltaic DC-to-AC converter that Fig. 8 is provided by the embodiment of the present application；
Fig. 9 by the embodiment of the present application provide when threshold voltage Uthr is more than sampling zero bias △ U absolute value, output
The stable position change schematic diagram of voltage DC component samples value；
Figure 10 by the embodiment of the present application provide when threshold voltage Uthr is less than sampling zero bias △ U absolute value, it is defeated
Go out the stable position change schematic diagram of voltage DC component samples value.
Embodiment
The core of the application is to provide a kind of method and system for controlling sample circuit zero bias, and it divides output voltage direct current
Amount and operational factors of two parameters of output current DC component as negative feedback, more preferable negative feedback control can be played and made
With the influence existing for mitigation sample circuit caused by zero bias, there is provided more preferable control accuracy.
To make the purpose, technical scheme and advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In accompanying drawing, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art
The all other embodiment obtained under the premise of creative work is not made, belong to the scope of the application protection.
Below in conjunction with Fig. 1, a kind of flow of the method for control sample circuit zero bias that Fig. 1 is provided by the embodiment of the present application
Figure.
It specifically includes following steps：
S101：The flip-flop that output voltage and output current include in extraction circuit, obtains output voltage DC component
With output current DC component；
This step is intended to the extraction from the output current of the output voltage in circuit and obtains its each self-contained flip-flop,
Obtain output voltage DC component and output current DC component.
The circuit composition of one off-network type photovoltaic DC-to-AC converter of manufacture is very huge, and the application is only from output voltage DC component meeting
The part impacted, and the part of sample circuit correlation carry out extracting output voltage DC component and output current direct current point
The operation of amount.
It is varied to obtain the mode of output voltage and output current in circuit, for example, can access in place
Corresponding component, can also carry out in its voltage, direction of current flow retaining using other means etc., herein not
Being specifically limited to how to obtain output voltage and output current in circuit, the component set should be combined depending on actual conditions, is set
Put custom and other influence factors carry out comprehensive selection.
As to how extraction obtains the mode of its respective flip-flop from the output voltage and output current got
Also have a lot, relatively conventional and easy to use one kind is to utilize low pass filter.
Low pass filter is that to allow signal less than cut-off frequency to pass through but intransitable higher than the signal of cut-off frequency
Electronic filtering device.Low pass filter is made up of Resistor-Capacitor Unit or inductance, and its resonant frequency is higher, for low frequency point
Amount shows high impedance, why can be extracted to obtain DC component with low pass filter, is the bilateral frequency because DC component
Rate is 0, so the impedance for showing infinity can not be by filtering device, and high-pass filter then contrast, its resonance
High impedance is presented to high-frequency signal than relatively low for frequency, and DC component almost can be completely by that therefore can use LPF
Device realizes the extraction to DC component.
Certainly, extract to obtain DC component there is also other modes, such as by that can realize similar to algorithm of purpose etc.
Deng, herein and it is not specifically limited, the use of low pass filter is a kind of relatively simple mode used, can be according to reality
Border situation is selected.
It is imperfect generally in the output voltage DC component and output current DC component obtained using low pass filter
, various flaws be present, also just can not be well in the application of follow-up processing step, even if applying by force follow-up
In step, final purpose can not be also realized well.Therefore generally also need to being obtained by low pass filter or other similar fashions
To output voltage DC component and output current DC component reprocessed, it is straight to obtain a more perfect output voltage
Flow component and output current DC component.For example, it can be carried out by noise reduction process device or other similar devices etc.
This processing.
S102：Output voltage is suppressed by PI controllers using output voltage DC component and output current DC component
The existing sampling zero bias of DC component.
On the basis of S101, this step is intended to pass through PI using output voltage DC component and output current DC component
To suppress, output voltage DC component is existing to sample zero bias to controller (proportional integral controller).
The target of output voltage DC component control is so that the voltage of inverter output does not include DC component；Due to adopting
There are zero bias, the control of existing output voltage DC component in sample circuit, majority is to carry out calculating control using output voltage,
Thus voltage sampling circuit is referred at least to, if voltage sampling circuit has zero bias, the sampled value with zero bias is worked as and put into effect
The sampled value on border is controlled, and controls obtained situation of the output voltage without DC component, if control parameter is forbidden, control
As a result it is naturally inaccurate, i.e., DC component still is included, the DC component of this part can influence inversion inductor so as to change inversion
Electric current.Increase inverter current DC component and participate in control, can simply be interpreted as, control output voltage and inverter current not
Containing DC component, overcome zero bias to influence by inverter current DC component, improve precision.
Going to press down by PI controllers using the output voltage DC component and output current DC component the two parameters
It is big due to output voltage DC component and output current DC component during the existing sampling zero bias of output voltage DC component processed
It is small inconsistent, each can be also inconsistent to the situation of the suppression for sampling zero bias, can be further, according to each under different situations
Parameter suppresses the difference of dynamics to sampling zero bias, different weights is assigned for the two parameters, to make full use of suppression dynamics strong
Parameter significantly more efficient suppression is carried out to sampling zero bias.
Wherein, pi regulator is a kind of linear controller, and it forms control deviation according to set-point and real output value, will
The ratio and integration of deviation form controlled quentity controlled variable by linear combination, and controlled device is controlled.In brief, PI controllers are each
The effect of correction link is as follows：(1) proportional component：Immediately the deviation signal of proportional reflection control system, deviation are once produced
Raw, controller produces control action immediately, to reduce deviation.Generally as the increasing of value, the overshoot of closed-loop system increase, it is
Response speed of uniting is accelerated, but when increasing to a certain extent, system can become unstable；(2) integral element：It is mainly used in eliminating
Static difference, improve system without margin.The power of integral action depends on integral constant, and bigger, integral action is weaker, otherwise more
By force.Bigger generally in the case of constant, i.e., integral action is weaker, and the overshoot of closed-loop system is smaller, the response speed of system
It is slack-off.
Based on above-mentioned technical proposal, the embodiment of the present application provide a kind of control sample circuit zero bias method, by
Form extraction in the circuit of off-network type photovoltaic DC-to-AC converter and obtain output voltage DC component and output current DC component, and utilize
The two can react on the parameter of output voltage DC component, export electricity with reducing in reaction using negative-feedback jointly
Straightening flow component.This method is using two parameters of output voltage DC component and output current DC component as negative feedback
Operational factors, more preferable negative feedback control effect can be played, mitigates the influence caused by zero bias existing for sample circuit, there is provided more
Good control accuracy.
Below in conjunction with Fig. 2, the stream of the method for another control sample circuit zero bias that Fig. 2 is provided by the embodiment of the present application
Cheng Tu.
It specifically includes following steps：
S201：Low-pass filtering operation is performed to output voltage and output current respectively using low pass filter, obtains low pass
Filter result；
S202：Noise reduction process is carried out to LPF result, obtains output voltage DC component and output voltage direct current point
Amount；
S201 and S202 is intended to carry out low pass to the output voltage and output current that get first with low pass filter
Filtering operation, i.e., the characteristic for not allowing DC component to pass through using low pass filter, extraction obtain respective DC component, then right
Extract obtained each DC component and carry out noise reduction process by noise reduction process device, to obtain a more perfect output voltage
DC component and output voltage DC component.
S203：It is utilized respectively the first preset weights and the second preset weights is straight to output voltage DC component and output current
Flow component is weighted, and is obtained weighting output voltage DC component and is weighted output current DC component；
This step be intended to respectively output voltage DC component and output current DC component set corresponding to it is first default
Weights and the second preset weights, and using first preset weights and second preset weights respectively to output voltage DC component
It is weighted with output current DC component, to obtain weighting output voltage DC component and weight output current DC component.
Wherein, first preset weights and second preset weights can be different, can also be identical, should regard under actual conditions
Sample the difference influenceed caused by zero bias, you can the size between the value of feedback and threshold value according to output voltage DC component is certainly
Row changes the proportionate relationship between first preset weights and second preset weights, and zero bias are sampled with more preferable control.
S204：Suppressed using weighting output voltage DC component and weighting output current DC component by PI controllers
The existing sampling zero bias of output voltage DC component.
This step, which is intended to utilize, on the basis of S203 weights output voltage DC component and weighting output current direct current point
Amount suppresses to sample zero bias existing for output voltage DC component by PI controllers.
Below in conjunction with Fig. 3, the stream of the method for another control sample circuit zero bias that Fig. 3 is provided by the embodiment of the present application
Cheng Tu.
It specifically includes following steps：
S301：Noise reduction process is carried out to LPF result, obtains output voltage DC component and output voltage direct current point
Amount；
This step is identical with S202, and related content description may refer to S202 relevant portions, will not be repeated here.
S302：Judge whether the value of feedback of output voltage DC component is more than threshold value；
This step be intended to by output voltage DC component feed back to whether be more than setting threshold value come judge should how
Change the proportionate relationship between the first preset weights and the second preset weights.With reference to substantial amounts of test data, the threshold value can be set
1/5th of the output voltage DC component maximum feedback value are set to, certainly, in the off-network type photovoltaic DC-to-AC converter of different model
Each component composition is different, and actual numerical value is also impossible to completely equivalent, herein and is not specifically limited, just for the application institute
This scheme provided provides a referential data, should be made a choice depending on the various influence factors synthesis under actual conditions.
S303：Control the first preset weights and the ratio of the second preset weights to be at least 3, obtain the first value and first with sovereign right
From weights；
This step is established in the case where S302 judged result is more than the threshold value for the value of feedback, it is intended to is controlled first pre-
If weights and the ratio of the second preset weights are at least 3, that is, obtain the value with sovereign right of larger first and be up to first value with sovereign right
The first of/3rd is from weights.Further, the ratio can also be heightened again, it is 5,7 or even 8 or 9 to reach ratio, with
In the case where the value of feedback is more than the threshold value, i.e. the maximum situation of negative-feedback degree of the output voltage DC component to itself
Under, fully improve output voltage DC component influence degree, can according to the degree more than the threshold value according to certain principle from
Row is adjusted, and herein and is not specifically limited.
S304：The first value with sovereign right and first is utilized respectively to divide output voltage DC component and output current direct current from weights
Amount is weighted；
S305：Control the second preset weights and the ratio of the first preset weights to be at least 5, obtain the second value and second with sovereign right
From weights；
This step is established in the case where S302 judged result is less than the threshold value for the value of feedback, it is intended to is controlled first pre-
If weights and the ratio of the second preset weights are at least 5, that is, obtain the value with sovereign right of larger first and be up to first value with sovereign right
The first of/5th is from weights.It is worth noting that, the weighting object of the second value with sovereign right in this step is that output current is straight
Flow component, rather than output voltage DC component.In addition it is straight can also constantly to be heightened according to the degree less than the threshold value for output current
Second sovereignty the corresponding with output voltage DC component second ratio from weights of value corresponding to flow component, for example, 7,9 even
Only output voltage DC component is suppressed using parameter of the output current DC component as negative-feedback.
S306：The second value with sovereign right and second is utilized respectively to divide output current DC component and output voltage direct current from weights
Amount is weighted.
Based on above-mentioned technical proposal, the embodiment of the present application provide a kind of control sample circuit zero bias method, by
Form extraction in the circuit of off-network type photovoltaic DC-to-AC converter and obtain output voltage DC component and output current DC component, and utilize
The two can react on the parameter of output voltage DC component, export electricity with reducing in reaction using negative-feedback jointly
Straightening flow component.This method is using two parameters of output voltage DC component and output current DC component as negative feedback
Operational factors, more preferable negative feedback control effect can be played, mitigates the influence caused by zero bias existing for sample circuit, there is provided more
Good control accuracy.
Because situation is complicated, it can not enumerate and be illustrated, those skilled in the art should be able to recognize more the application
The basic skills principle combination actual conditions of offer may have many examples, in the case where not paying enough creative works,
Should be in the protection domain of the application.
Refer to Fig. 4 and Fig. 5 below, Fig. 4 is by a kind of control sample circuit zero bias that the embodiment of the present application provides
The structured flowchart of system；The structured flowchart of the system for another control sample circuit zero bias that Fig. 5 is provided by the embodiment of the present application.
The system can include：
Parameter acquisition module 100, for extracting the flip-flop that output voltage and output current include in circuit, obtain defeated
Go out voltage DC component and output current DC component；
Zero bias suppression module 200, for being controlled using output voltage DC component and output current DC component by PI
To suppress, output voltage DC component is existing to sample zero bias to device.
Wherein, parameter acquisition module 100 includes：
Low-pass filtering treatment submodule, for performing low pass to output voltage and output current respectively using low pass filter
Filtering operation, obtain LPF result；
Noise reduction process submodule, for carrying out noise reduction process to LPF result, obtain output voltage DC component
Output voltage DC component.
Wherein, zero bias suppression module 200 includes：
Weight assignment submodule, for being utilized respectively the first preset weights and the second preset weights to output voltage direct current point
Amount and output current DC component are weighted, and are obtained weighting output voltage DC component and are weighted output current DC component；
Suppress submodule, controlled for utilizing to weight output voltage DC component and weight output current DC component by PI
To suppress, output voltage DC component is existing to sample zero bias to device processed.
Wherein, weight assignment submodule includes：
Threshold decision unit, for judging whether the value of feedback of output voltage DC component is more than threshold value；
First processing units, for controlling the ratio of the first preset weights and the second preset weights to be at least 3, obtain sovereignty
Value and from weights；
First weighted units, for being utilized respectively value with sovereign right and straight to output voltage DC component and output current from weights
Flow component is weighted；
Second processing unit, for controlling the ratio of the second preset weights and the first preset weights to be at least 5, obtain second
Sovereignty value and second is from weights；
Second weighted units, for be utilized respectively the second value with sovereign right and second from weights to output current DC component and defeated
Go out voltage DC component to be weighted.
Wherein, weight assignment submodule includes：
It is preferred that second processing unit, for the first preset weights to be set to 0, the second preset weights put 1, obtain second for 1
Sovereignty value and for 0 second from weights..
Refer to Fig. 6 to Figure 10, a kind of equivalent electric for control sample circuit zero bias that Fig. 6 is provided by the embodiment of the present application
Lu Tu；A kind of equivalent circuit diagram for off-network type photovoltaic DC-to-AC converter that Fig. 7 is provided by the embodiment of the present application；Fig. 8 is that the application is real
Apply a kind of model schematic for off-network type photovoltaic DC-to-AC converter that example is provided；Fig. 9 works as threshold value by what the embodiment of the present application provided
When voltage Uthr is more than sampling zero bias △ U absolute value, the stable position change schematic diagram of output voltage DC component sampled value；
Figure 10 by the embodiment of the present application provide when threshold voltage Uthr is less than sampling zero bias △ U absolute value, output voltage is straight
The stable position change schematic diagram of flow component sampled value.
Each module can apply in the specific concrete instance of following one above：
With reference to shown in Fig. 7, Ui is the voltage of inverter, and Ri is the internal resistance of inverter, and Ii is inverter current, and Ro hinders for load
Anti-, Uo is output voltage, and Uref gives for inverter output voltage with reference to shown in Fig. 8, and Uo is inverter actual output voltage, △
U is sampling zero bias, and Ui is the equivalent voltage source of inverter.
When inverter exports stable state, Uref on Uo+ △ U perfect trackings, now output voltage sampled value Uo+ △ U's is straight
Flow component is equal to zero, and output voltage actual value Uo DC component should be equal to-△ U, namely the control of output voltage DC component
Precision processed is directly affected by sampling zero bias.
Because DC component existing for true output voltage can sample to obtain indirectly by inverter current, therefore can examine
Consider the control accuracy that output voltage DC component is improved using inverter current DC component.When output voltage DC component is larger
When, using output voltage DC component and inverter current DC component weighted superposition as the feedback of controller, regulation can be increased
Dynamics, reach the effect of quick regulation；When output voltage DC component is smaller, sampled because output voltage DC component is present
Zero bias problem, therefore feedback of the inverter current DC component as controller is used merely, output voltage sampling zero can be eliminated
Inclined influence, control accuracy is improved, because individually using current dc component as control, the target of control is electric current, system
Internal resistance not necessarily can accurate measurement, so the conversion from target voltage to target current need complicated calculating nor
It is certain accurate.
Left one side of something show situation (a) as △ U in Fig. 9<When 0, output voltage DC component sampled value positively biased, right half of institute
Situation (b) is shown as △ U>When 0, output voltage DC component sampled value negative bias.
The left one side of something of Figure 10 show situation (a) as △ U<When 0, output voltage DC component sampled value positively biased, Figure 10 right half
While situation (b) is shown as △ U>When 0, output voltage DC component sampled value negative bias.
By Fig. 9 it is known that when threshold voltage Uthr is more than sampling zero bias △ U absolute value, output voltage direct current point
The stable position and sampling zero bias of amount sampled value are negatively correlated, i.e., the latter's negative bias corresponds to the former positively biased (see the left Half-edge Graphs of Fig. 9), after
Person's positively biased corresponds to the former negative bias (see the right Half-edge Graphs of Fig. 9), and now output voltage actual value Uo DC component absolute value is equal to zero.
By Figure 10 it is known that when threshold voltage Uthr is less than sampling zero bias △ U absolute value, output voltage direct current point
It is also negatively correlated to measure stable position and the sampling zero bias of sampled value, but now output voltage actual value Uo DC component is absolute
Value is equal to △ U-Uthr (be not equal to zero), but use output voltage DC component but to be controlled as compared with feedback with simple
Static error is reduced to by △ U | △ U-Uthr |, and then improve control accuracy.Fig. 9 is surely at △ U, and Figure 10 is then at Uthr
The reason for fluctuation, is, in Near Threshold, two kinds of mutual switching controls of weight ratio so that can not if Fig. 9 is surely in fixed value, but
One value fluctuation, the amplitude of fluctuation are relevant with control accuracy etc..
Under normal circumstances, sample zero bias △ U should all be less than output voltage DC component index request Ureq (UPS's
Index request is 200mV), if detecting that △ U are more than Ureq, then can be determined that to detect circuit malfunction.Before above-mentioned
Condition is put forward, judges and controls, it is necessary to consider detection circuit malfunction when selection changes the threshold voltage Uthr of weight coefficient
The paradox of precision therebetween.When threshold voltage Uthr is excessive, easy detection trigger circuit malfunction failure；Work as threshold voltage
When Uthr is too small, static error is difficult to control to zero.Select Uthr equal to 0.2 times of Ureq a simply reference value, Uthr's
Value can be adjusted according to actual conditions.When selecting weight coefficient, increase output voltage DC component weight, be because
When sampling zero bias are more than threshold voltage Uthr, the rapid clamper of static error can will be controlled to exist | △ U |-Uthr, and then improve
The stability of controller.
Each embodiment is described by the way of progressive in specification, and what each embodiment stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think to exceed scope of the present application.
Specific case used herein is set forth to the principle and embodiment of the application, and above example is said
It is bright to be only intended to help and understand the present processes and its core concept.It should be pointed out that the ordinary skill for the art
For personnel, on the premise of the application principle is not departed from, some improvement and modification, these improvement can also be carried out to the application
Also fallen into modification in the application scope of the claims.
It should also be noted that, in this manual, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including key element, method, article or equipment being also present.
Claims (10)
- A kind of 1. method for controlling sample circuit zero bias, it is characterised in that including：The flip-flop that output voltage and output current include in extraction circuit, obtains output voltage DC component and output current DC component；Suppress the output by PI controllers using the output voltage DC component and the output current DC component The existing sampling zero bias of voltage DC component.
- 2. according to the method for claim 1, it is characterised in that output voltage and output current include straight in extraction circuit Composition is flowed, including：Low-pass filtering operation is performed to the output voltage and the output current respectively using low pass filter, obtains low pass filtered Ripple result；Noise reduction process is carried out to the LPF result, obtains the output voltage DC component and the output voltage direct current Component.
- 3. method according to claim 1 or 2, it is characterised in that utilize the output voltage DC component and described defeated Go out current dc component and suppress to sample zero bias existing for the output voltage DC component by PI controllers, including：It is straight to the output voltage DC component and the output current to be utilized respectively the first preset weights and the second preset weights Flow component is weighted, and is obtained weighting output voltage DC component and is weighted output current DC component；Using it is described weighting output voltage DC component and it is described weighting output current DC component by the PI controllers come Suppress the existing sampling zero bias of the output voltage DC component.
- 4. according to the method for claim 3, it is characterised in that be utilized respectively the first preset weights and the second preset weights pair The output voltage DC component and the output current DC component are weighted, including：Judge whether the value of feedback of the output voltage DC component is more than threshold value；If so, then controlling first preset weights and the ratio of second preset weights to be at least 3, the first value with sovereign right is obtained With first from weights；Be utilized respectively the described first value with sovereign right and described first from weights to the output voltage DC component and it is described export it is electric Stream DC component is weighted；If it is not, then controlling second preset weights and the ratio of first preset weights to be at least 5, the second value with sovereign right is obtained With second from weights；Be utilized respectively the described second value with sovereign right and described second from weights to the output current DC component and it is described export it is electric Straightening flow component is weighted.
- 5. according to the method for claim 4, it is characterised in that control second preset weights and the described first default power The ratio of value is at least 5, obtains the second value and second with sovereign right from weights, including：First preset weights are set to 0, second preset weights put 1, obtain for 1 the second value with sovereign right and be 0 second From weights.
- A kind of 6. system for controlling sample circuit zero bias, it is characterised in that including：Parameter acquisition module, for extracting the flip-flop that output voltage and output current include in circuit, obtain output voltage DC component and output current DC component；Zero bias suppression module, for being controlled using the output voltage DC component and the output current DC component by PI To suppress, the output voltage DC component is existing to sample zero bias to device.
- 7. system according to claim 6, it is characterised in that the parameter acquisition module includes：Low-pass filtering treatment submodule, for being performed respectively to the output voltage and the output current using low pass filter Low-pass filtering operation, obtain LPF result；Noise reduction process submodule, for carrying out noise reduction process to the LPF result, obtain the output voltage direct current point The output voltage DC component of amount.
- 8. the system according to claim 6 or 7, it is characterised in that the zero bias suppression module includes：Weight assignment submodule, for being utilized respectively the first preset weights and the second preset weights to the output voltage direct current point Amount and the output current DC component are weighted, and are obtained weighting output voltage DC component and are weighted output current direct current point Amount；Suppress submodule, for passing through using the weighting output voltage DC component and the weighting output current DC component To suppress, the output voltage DC component is existing to sample zero bias to the PI controllers.
- 9. system according to claim 8, it is characterised in that the weight assignment submodule includes：Threshold decision unit, for judging whether the value of feedback of the output voltage DC component is more than threshold value；First processing units, for controlling first preset weights and the ratio of second preset weights to be at least 3, obtain Sovereignty value and from weights；First weighted units, for be utilized respectively the value with sovereign right and it is described from weights to the output voltage DC component and institute Output current DC component is stated to be weighted；Second processing unit, for controlling second preset weights and the ratio of first preset weights to be at least 5, obtain Second sovereignty value and second is from weights；Second weighted units, for be utilized respectively the described second value with sovereign right and described second from weights to the output current direct current Component and the output voltage DC component are weighted.
- 10. system according to claim 9, it is characterised in that the weight assignment submodule includes：It is preferred that second processing unit, for first preset weights to be set to 0, second preset weights put 1, obtain as 1 Second sovereignty value and for 0 second from weights.
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