CN103488224B - Method, system and circuit for adjusting digital potentiometers based on specific value - Google Patents
Method, system and circuit for adjusting digital potentiometers based on specific value Download PDFInfo
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Abstract
The invention provides a method, system and circuit for adjusting digital potentiometers based on a specific value. The method is applied to the circuit including a variable resistor unit composed of a plurality of digital potentiometers, and one coherent signal of the circuit is related to the resistance value of the variable resistor unit. Firstly, the expected total resistance value of the variable resistor unit is ensured based on the expected value of the coherent signal of the circuit, and the order of each digital potentiometer is ensured based on the expected total resistance value and the resistance value distribution characteristics of the digital potentiometers under an ideal condition; then, after the order of each digital potentiometer is set, whether a preset constraint condition is met or not is judged by utilizing the feedback value of the coherent signal, and when the preset constraint condition is met, the adjustment proportion of the resistance values is ensured based on the feedback value and the expected value of the coherent signal of the circuit, and the adjustment amount of each digital potentiometer is ensured based on the adjustment proportion and the current order of the variable resistor unit; then, whether the preset constraint condition is met or not continues to be judged, the step is continuously repeated in the same way until the preset constraint condition is not met, and therefore the errors of the digital potentiometers can be effectively reduced.
Description
Technical field
The present invention relates to digital circuit field, particularly relate to and a kind ofly regulate the control method of digital regulation resistance, system and DC power supply circuit based on ratio.
Background technology
D.C. regulated power supply generally all adopts DC voltage modular converter (DC-DC) or low pressure difference linear voltage regulator (LDO) to realize, and uses feedback resistive network to carry out regulation output voltage simultaneously.As long as resistance in change feedback resistive network, according to loading demand dynamic conditioning output voltage, accurate high efficiency power can be realized.
Along with the development of digital regulation resistance technology is with ripe, in increasing application, mechanical variable resistance in feedback resistive network replaced by digital regulation resistance, not only increase product stability, numerical and intelligent level thus, also can reduce circuit volume and increase the service life, as at application number be 200620069824.5,201010512246.9 and 201120377518.9 each Chinese patent literature in, disclose the circuit etc. of various employing digital regulation resistance.But digital regulation resistance also exists many deficiencies, resistance error poor with high voltage performance as low in resistance resolution ratio large and temperature float seriously.The problems referred to above strongly limit digital regulation resistance applying in high accuracy field.
Digital regulation resistance source of error mainly comprises: end-to-end resistance R
aBerror, internal element resistance R
serror and output sliding end resistance R
werror, influence factor comprises manufacture craft and variation of ambient temperature etc.The 10 bit digital potentiometer resistance errors distributions of Fig. 1 to be certain external large-scale producer nominal resistance be 10K.As seen from the figure, the end-to-end R of this digital regulation resistance
aBresistance error reaches 8%.Although differential non-linearity errors is less after end-to-end resistance corrects, consider sliding end R
werror and warm drift factor, in practice, integral non-linear error is often beyond 5LSB.
The circuit of existing employing digital regulation resistance, it is all often the resistance calculating digital regulation resistance according to ideal formula, and then the corresponding exponent number of configuration digital regulation resistance, owing to not considering the error (hundreds of ohm may be arrived) of digital regulation resistance self, the precision of circuit can be had a strong impact on thus.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of control method and the system that regulate digital regulation resistance based on ratio, to effectively reduce the error of digital regulation resistance.
Another object of the present invention is to the DC power supply circuit that a kind of wide output area is provided.
For achieving the above object and other relevant objects, the invention provides a kind of control method regulating digital regulation resistance based on ratio, it is applied to the circuit comprising the variable resistance unit be made up of multiple digital regulation resistance, and a coherent signal of this circuit is relevant to the resistance of variable resistance unit, describedly the control method of digital regulation resistance is regulated at least to comprise based on ratio:
1) desired value based on the coherent signal of described circuit determines the total resistance of the expectation of variable resistance unit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation;
2) after the exponent number of each digital regulation resistance is arranged, judge whether predetermined constraints condition meets;
3) when predetermined constraints condition meets, resistance resize ratio is determined based on the value of feedback of the coherent signal of described circuit and desired value, and determine the adjustment amount of each digital regulation resistance exponent number based on the current exponent number of described resize ratio and variable resistance unit, resume at step 2 subsequently);
Wherein, described predetermined constraints condition comprises a or b:
A, the described value of feedback of circuit coherent signal and the error of desired value are more than in the first preset range, and the number of times resetting each digital regulation resistance is less than pre-determined number;
The total resistance of reality of b, described variable resistance unit and the error of the total resistance of expectation are more than in the second preset range, and the number of times resetting each digital regulation resistance is less than pre-determined number.
The present invention also provides a kind of regulating system regulating digital regulation resistance based on ratio, it is applied to the circuit comprising the variable resistance unit be made up of multiple digital regulation resistance, and a coherent signal of this circuit is relevant to the resistance of variable resistance unit, describedly the regulating system of digital regulation resistance is regulated at least to comprise based on ratio:
Exponent number determining unit, the desired value for the coherent signal based on described circuit determines the total resistance of the expectation of variable resistance unit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation;
Judging unit, for after the exponent number of each digital regulation resistance is arranged, judges whether predetermined constraints condition meets;
Adjustment unit, determines resistance resize ratio for the value of feedback of the coherent signal based on described circuit and desired value, and determines the adjustment amount of each digital regulation resistance exponent number based on the current exponent number of described resize ratio and variable resistance unit;
Wherein, described predetermined constraints condition comprises a or b:
The value of feedback of coherent signal of a, described circuit and the error of desired value are more than the first preset range, and the number of times resetting each digital regulation resistance is less than pre-determined number;
The total resistance of reality of b, described variable resistance unit and the error of the total resistance of expectation are more than the second preset range, and the number of times resetting each digital regulation resistance is less than pre-determined number.
The present invention also provides a kind of DC power supply circuit of wide output area, and it at least comprises:
Direct current stabilizer;
Comprise the resistor network of variable resistance unit, be connected with described direct current stabilizer, for regulating the output voltage of described direct current stabilizer, wherein, described variable resistance unit comprises multiple digital regulation resistance;
Controller, comprises aforementioned regulating system, and it is connected to described direct current stabilizer output, for arranging the resistance of each digital regulation resistance and gathering the output voltage of described direct current stabilizer.
As mentioned above, of the present inventionly regulate the method for digital regulation resistance, system and circuit based on ratio, there is following beneficial effect: eliminate higher integral non-linear error based on the coherent signal of circuit and the resistance of variable resistance unit is relevant and digital regulation resistance differential non-linearity errors is little characteristic; And replacement Searching point is optimized search, accelerates digital regulation resistance layoutprocedure, at utmost ensure that the output accuracy of dc source in good time.
Accompanying drawing explanation
Fig. 1 is shown as the 10 bit digital potentiometer resistance error distribution schematic diagrams that certain producer's nominal resistance existing is 10K.
Fig. 2 is shown as the control method flow chart regulating digital regulation resistance based on ratio of the present invention.
Fig. 3 is shown as application DC-stabilized circuit schematic diagram of the present invention.
Fig. 4 is shown as application traversal and realizes output voltage error schematic diagram after global optimum.
Fig. 5 is shown as the regulating system schematic diagram regulating digital regulation resistance based on ratio of the present invention.
Fig. 6 is shown as output voltage error schematic diagram when the reference voltage of the circuit shown in Fig. 3 and feedback resistance do not exist error.
Fig. 7 is shown as digital regulation resistance exponent number when the reference voltage of the circuit shown in Fig. 3 and feedback resistance do not exist error and arranges number of times schematic diagram.
Fig. 8 is shown as output voltage error schematic diagram when the reference voltage of the circuit shown in Fig. 3 and feedback resistance exist error.
Fig. 9 is shown as digital regulation resistance exponent number when the reference voltage of the circuit shown in Fig. 3 and feedback resistance exist error and arranges number of times schematic diagram.
Element numbers explanation
1 DC-stabilized circuit
11 voltage-stablizers
12 variable resistance unit
13 loads
14 controllers
2 regulating systems
21 exponent number determining units
22 judging units
23 adjustment units
S1 ~ S3 step
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this description can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by detailed description of the invention different in addition, and the every details in this description also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to Fig. 2 to Fig. 9.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Figure 2, the invention provides a kind of control method regulating digital regulation resistance based on ratio.Wherein, method according to the present invention has been come mainly through regulating system, and this regulating system includes but not limited to install in the controller and can realize the application module etc. of the present invention program.
Wherein, described control method is mainly used in the circuit comprising variable resistance unit, and described variable resistance unit comprises multiple digital regulation resistance, the type of each digital regulation resistance can be identical, also can be incomplete same, each digital regulation resistance connects with series, parallel or series-parallel system, and, in the circuit, there is the resistance of a coherent signal and variable resistance unit linear.Preferably, described circuit includes but not limited to DC-stabilized circuit etc.
Such as, as shown in Figure 3, this DC-stabilized circuit 1 comprises voltage-stablizer 11, by digital regulation resistance R2, R3 variable resistance unit 12, the resistance R1 connecting described variable resistance unit 12 and controller 14 in series, the feedback resistive network of this variable resistance unit 12 and resistance R1 voltage-stablizer 11 in series, this voltage-stablizer 11 exports DC voltage V to load 13, and this output voltage V and variable resistance unit 12 resistance R
12relevant, that is: V=V
ref* (R
1/ R
12+ 1), wherein, V
reffor reference voltage.
In step sl, described regulating system determines the total resistance of the expectation of variable resistance unit based on the desired value of the coherent signal of described circuit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation.
Particularly, described regulating system first based on the resistance of variable resistance unit in circuit and the coherent signal of circuit incidence relation determination variable resistance unit the total resistance of expectation, then the connected mode of digital regulation resistance comprised based on variable resistance unit and the step-length of each digital regulation resistance determine the exponent number of each digital regulation resistance.
Such as, for the DC-stabilized circuit 1 shown in Fig. 3, digital regulation resistance R2, R3 that variable resistance unit 12 comprises connect in a series arrangement, and respective step-length is L2, L3, if the desired value of voltage-stablizer 11 output voltage is V
0, then described regulating system is according to output voltage V and variable resistance unit 12 resistance R
12relational expression: V=V
ref* (R
1/ R
12+ 1) determine that the total resistance of the expectation of variable resistance unit 12 is R
0; Subsequently, described regulating system is again based on the total resistance R of theory of variable resistance unit 12
12=R
2+ R
3determine the exponent number of digital regulation resistance R2, R3.As exponent number N
2, N
3when being 0, the theoretical all-in resistance R of variable resistance unit 12
12(0); Subsequently, described regulating system again based on the larger digital regulation resistance R2 of step-length step-length L2 and expect total resistance R
0with theoretical all-in resistance R
12(0) departure Δ R=R
0-R
12(0) the exponent number N of the digital regulation resistance R2 that step-length is larger, is determined
2=Δ R|L2, " | " represents and divides exactly; Calculate the residual delta r=Δ R-N2*L2 of the departure Δ R after overcompensation subsequently again; And then the exponent number N of digital regulation resistance R3 is determined based on the step-length L3 of the less digital regulation resistance R3 of step-length and residual delta r
3=Δ r|L3, can make final remaining residual error be no more than the step-length L3 of digital regulation resistance R3 thus.
Preferably, described regulating system also can adjust determined exponent number, to reduce final remaining residual error further based on the connected mode of each digital regulation resistance and each digital regulation resistance step-length separately again.
Such as, for by digital regulation resistance variable resistance unit in series, if final remaining residual error exceedes the half of minimum step, then the exponent number of digital regulation resistance corresponding for minimum step is added 1 by described regulating system again, thus, final remaining residual error can be made to be no more than the half of minimum step.
Again such as, for the variable resistance unit that two digital regulation resistances being respectively L11 and L12 by step-length are in series, if the ratio of step-length L11 and L12 is 5:2, if then final remaining residual error is greater than 3/4ths of minimum step L12, then the exponent number of the digital regulation resistance of the correspondence of minimum step L12 is added 1 by described regulating system again, thus, within final remaining residual error can being made to be down to 1/4th of minimum step L12; If final remaining residual error exceedes 1/4th of minimum step L12 and is no more than 3/4ths of minimum step L12, the exponent number of the digital regulation resistance that then exponent number of digital regulation resistance corresponding for step-length L11 is added 1 by described regulating system again, minimum step L12 is corresponding subtracts 2, within final remaining residual error can be made thus to be reduced to 1/4th of minimum step L12 again.
Then, in step s 2, after each digital regulation resistance exponent number is arranged, described regulating system judges whether predetermined constraints condition meets, and if so, then enters step S3, then terminates if not.
Wherein, described predetermined constraints condition comprise any can be used for determine the need of adjustment each digital regulation resistance exponent number condition, preferably, include but not limited to following one: a) value of feedback of the coherent signal of described circuit and the error of desired value are more than the first preset range, and the number of times resetting each digital regulation resistance is less than pre-determined number; B) the total resistance of the reality of described variable resistance unit and the error of the total resistance of expectation are more than the second preset range, and the number of times arranging each digital regulation resistance is less than pre-determined number.
Wherein, the value of feedback of the coherent signal of described circuit can be gathered voluntarily by described regulating system, also can by the collecting unit in circuit, and such as, controller provides.
Wherein, the total resistance of the reality of described variable resistance unit calculates according to the incidence relation of the value of feedback of the coherent signal of circuit and the coherent signal of circuit and variable resistance unit resistance.
Such as, for circuit shown in Fig. 3, after determined each digital regulation resistance exponent number arranges each digital regulation resistance in based on step S1, described regulating system is based on the value of feedback V of circuit output voltage
0' and incidence relation formula between output voltage and the resistance of variable resistance unit: V=V
ref* (R
1/ R
12+ 1) determine that the total resistance of the reality of variable resistance unit is R
12', and be R based on the total resistance of reality
12' with expect the error of total resistance more than 0.5 ohm and each digital regulation resistance exponent number is set number of times is set more than 18 times, determine the exponent number needing to adjust each digital regulation resistance.
Then, in step s3, when predetermined constraints condition meets, then described regulating system determines resistance resize ratio based on the value of feedback of the coherent signal of described circuit and desired value, and determine the adjustment amount of each digital regulation resistance exponent number based on the current resistance of described resize ratio and variable resistance unit, resume at step S2 subsequently.
Particularly, if the dependency relation of the resistance R of the coherent signal Y of circuit and variable resistance unit is: Y=K*R
t+ A, wherein, K, t, A are constant, thus, the desired value Y of this coherent signal Y
expectresistance R total with the expectation of variable resistance unit
expectrelation can be expressed as: Y
expect=K*R
t expect+ A, namely: R
expect=(Y
expect-A)
-t/ K;
Correspondingly, the actual total resistance R of variable resistance
actualwith the value of feedback Y of coherent signal Y
actualpass is: R
actual=(Y
actual-A)
-t/ K;
Two formulas are divided by and can be obtained:
Thus, the resistance of variable resistance unit is adjusted to current resistance by described regulating system
doubly.
Such as, for the circuit shown in Fig. 3, the total resistance R of expectation of variable resistance unit
expectwith the pass of the desired value V of output voltage be: R
expect=V
ref* R
1/ (V-V
ref);
The total resistance R of reality of variable resistance unit
actualwith the value of feedback V of output voltage
tpass is: R
actual=V
ref* R
1/ (V
t-V
ref) two formulas are divided by and can obtain:
If order
then R
expect=k
v* R
actual;
Thus, described regulating system determines the k that needs the resistance of variable resistance unit 12 to be adjusted to current resistance
vdoubly, because variable resistance unit 12 is in series by digital regulation resistance R2, R3, namely digital regulation resistance R2, R3 resistance is separately adjusted to the k of current resistance
vtimes, and then described regulating system can determine digital regulation resistance R2, R3 exponent number adjustment amount separately based on digital regulation resistance R2, R3 step-length separately.
Those skilled in the art determine the determination mode of the exponent number of each digital regulation resistance based on the total resistance of described expectation based on regulating system described in abovementioned steps S1, should be appreciated that described regulating system is based on digital regulation resistance R2, R3 step-length separately, determine digital regulation resistance R2, R3 exponent number adjustment amount separately, digital regulation resistance R2, R3 resistance to be separately adjusted to the k of current resistance
vmode doubly, therefore no longer described in detail at this.
In addition, also it should be noted that, described abovely only just to list, but not limitation of the present invention, in fact, the incidence relation of the resistance of the coherent signal Y of circuit and digital regulation resistance R11, R12, R13 of variable resistance unit also can be Y=K11 × R11+K12 × R12+K13 × R13 etc., and wherein, K11, K12, K13 are not exclusively equal or different.
As a kind of preferred embodiment, in abovementioned steps S2, after described regulating system calculates the error delta Y (i) of the current value of feedback of described circuit coherent signal and desired value, further judge this error amount Δ Y (i) whether be greater than before the error delta Y (i-1) of once calculated value of feedback and desired value, if, the exponent number of each digital regulation resistance once set before then showing has been local optimum, then in abovementioned steps S3, described regulating system redefines the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
For arbitrary resistance, various combination mode can be adopted to represent.Such as, for 100 ohm, 10 rank of digital regulation resistance RX can be adopted to represent, 8 rank of digital regulation resistance RX, 4 rank of digital regulation resistance RY also can be adopted to represent, if the more all combinations of traversal search, the global optimum that error is minimum can be obtained.
Such as, for the circuit shown in Fig. 3, R is worked as
1the step-length L2 of=100k, digital regulation resistance R2 is 10 ohm, and when the step-length L3 of digital regulation resistance R3 is 4 ohm, if the various combinations of traversal digital regulation resistance R2, R3, the output voltage error of acquisition as shown in Figure 4.As seen from the figure, the resistance resolution ratio of adjustable resistance unit 12, up to 0.1 ohm, is far smaller than the L3 of the less digital regulation resistance R3 step-length of step-length.
Although application traversal mode is searched resistance and can be realized very high precision, need hundreds and thousands of search, greatly reduce the response speed of circuit, lack practical value.But, from traversal search pattern, obtain an important enlightenment, even change search initial point and likely find the more figure of merit.For this reason, when Local Search cannot meet required precision, at local optimization value place, the adjustment amount of the exponent number of each digital regulation resistance can be redefined based on previous error delta Y (i-1).
Such as, for the circuit shown in Fig. 3, value of feedback once calculated before the current value of feedback of output voltage and the difference of desired value are greater than and the difference of desired value, and digital regulation resistance R2, R3 is respectively m1 based on the exponent number after front once determined respective exponent number adjustment amount adjustment, m2, then described regulating system is based on digital regulation resistance R2, the step-length of R3 is determined the exponent number m1 before digital regulation resistance R2 once after adjustment to add 2 than L2:L3=5:2, and the exponent number m2 after once adjusting before digital regulation resistance R3 is subtracted 5, thus, although, (theoretical total resistance is based on formula R for the theoretical total resistance of adjustable resistance unit 12
12=R
2+ R
3calculate) constant, but actual total resistance changes to some extent due to the physics actual error of digital regulation resistance R2, R3 resistance, thus output voltage can be caused to change.
As another kind of preferred embodiment, in abovementioned steps S2, described regulating system judges whether the total resistance of current reality of variable resistance unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation, if, the exponent number of each digital regulation resistance once set before then also showing has been local optimum, then in abovementioned steps S3, described regulating system redefines the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
It should be noted that, when at local optimization value place, also directly can be provided as final setting by previous, stop whole setting up procedure.
As shown in Figure 5, the invention provides a kind of regulating system regulating digital regulation resistance based on ratio.This regulating system 2 at least comprises: exponent number determining unit 21, judging unit 22 and adjustment unit 23.
Wherein, described regulating system 2 is mainly used in the circuit comprising variable resistance unit, and described variable resistance unit comprises multiple digital regulation resistance, the type of each digital regulation resistance can be identical, also can be incomplete same, each digital regulation resistance connects with series, parallel or series-parallel system, and, in the circuit, there is a coherent signal relevant to the resistance of variable resistance unit.Preferably, described circuit includes but not limited to DC-stabilized circuit etc.
Such as, as shown in Figure 3, this DC-stabilized circuit 1 comprises voltage-stablizer 11, by digital regulation resistance R2, R3 variable resistance unit 12, the resistance R1 connecting described variable resistance unit 12 and controller 14 in series, described regulating system 2 is arranged in described controller 14, the feedback resistive network of this variable resistance unit 12 and resistance R1 voltage-stablizer 11 in series, this voltage-stablizer 11 exports DC voltage V to load 13, and this output voltage V and variable resistance unit 12 resistance R
12linear, that is: V=V
ref* (R
1/ R
12+ 1), wherein, V
reffor reference voltage.
First, described exponent number determining unit 21 determines the total resistance of the expectation of variable resistance unit based on the desired value of the coherent signal of described circuit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation.
Particularly, described exponent number determining unit 21 first based on the resistance of variable resistance unit in circuit and the coherent signal of circuit linear correlation relation determination variable resistance unit the total resistance of expectation, then the connected mode of digital regulation resistance comprised based on variable resistance unit and the step-length of each digital regulation resistance determine the exponent number of each digital regulation resistance.
Such as, for the DC-stabilized circuit 1 shown in Fig. 3, digital regulation resistance R2, R3 that variable resistance unit 12 comprises connect in a series arrangement, and respective step-length is L2, L3, if the desired value of voltage-stablizer 11 output voltage is V
0, then described exponent number determining unit 21 is according to output voltage V and variable resistance unit 12 resistance R
12relational expression: V=V
ref* (R
1/ R
12+ 1) determine that the total resistance of the expectation of variable resistance unit 12 is R
0; Subsequently, described exponent number determining unit 21 is again based on the total resistance R of theory of variable resistance unit 12
12=R
2+ R
3determine the exponent number of digital regulation resistance R2, R3.As exponent number N
2, N
3when being 0, the theoretical all-in resistance R of variable resistance unit 12
12(0); Subsequently, described regulating system again based on the larger digital regulation resistance R2 of step-length step-length L2 and expect total resistance R
0with theoretical all-in resistance R
12(0) departure Δ R=R
0-R
12(0) the exponent number N of the digital regulation resistance R2 that step-length is larger, is determined
2=Δ R|L2, " | " represents and divides exactly; Calculate the residual delta r=Δ R-N2*L2 of the departure Δ R after overcompensation subsequently again; And then the exponent number N of digital regulation resistance R3 is determined based on the step-length L3 of the less digital regulation resistance R3 of step-length and residual delta r
3=Δ r|L3, can make final remaining residual error be no more than the step-length L3 of digital regulation resistance R3 thus.
Preferably, described exponent number determining unit 21 also can adjust determined exponent number, to reduce final remaining residual error further based on the connected mode of each digital regulation resistance and each digital regulation resistance step-length separately again.
Such as, for by digital regulation resistance variable resistance unit in series, if final remaining residual error exceedes the half of minimum step, then the exponent number of digital regulation resistance corresponding for minimum step is added 1 by described exponent number determining unit 21 again, thus, final remaining residual error can be made to be no more than the half of minimum step.
Again such as, for the variable resistance unit that two digital regulation resistances being respectively L11 and L12 by step-length are in series, if the ratio of step-length L11 and L12 is 5:2, if then final remaining residual error is greater than 3/4ths of minimum step L12, then the exponent number of the digital regulation resistance of the correspondence of minimum step L12 is added 1 by described exponent number determining unit 21 again, thus, within final remaining residual error can being made to be down to 1/4th of minimum step L12; If final remaining residual error exceedes 1/4th of minimum step L12 and is no more than 3/4ths of minimum step L12, the exponent number of the digital regulation resistance that then exponent number of digital regulation resistance corresponding for step-length L11 is added 1 by described exponent number determining unit 21 again, minimum step L12 is corresponding subtracts 2 again, and final remaining residual error can be made thus to reduce further.
Then, in step s 2, after each digital regulation resistance exponent number is arranged, described judging unit 22 judges whether predetermined constraints condition meets, and if so, then starts adjustment unit 23, then terminates if not.
Wherein, described predetermined constraints condition comprise any can be used for determine the need of adjustment each digital regulation resistance exponent number condition, preferably, include but not limited to following one: a) value of feedback of the coherent signal of described circuit and the error of desired value are more than the first preset range, and the number of times arranging each digital regulation resistance is less than pre-determined number; B) the total resistance of the reality of described variable resistance unit and the error of the total resistance of expectation are more than the second preset range, and the number of times arranging each digital regulation resistance is less than pre-determined number.
Wherein, the value of feedback of the coherent signal of described circuit can be gathered voluntarily by described regulating system 2, also can by the collecting unit in circuit, and such as, controller provides.
Wherein, the total resistance of the reality of described variable resistance unit calculates according to the dependency relation of the value of feedback of the coherent signal of circuit and the coherent signal of circuit and variable resistance unit resistance.
Such as, for circuit shown in Fig. 3, after each digital regulation resistance exponent number determined based on exponent number determining unit 21 arranges each digital regulation resistance, described judging unit 22 is based on the value of feedback V of circuit output voltage
0' and linear relation between output voltage and the resistance of variable resistance unit: V=V
ref* (R
1/ R
12+ 1) determine that the total resistance of the reality of variable resistance unit is R
12', and be R based on the total resistance of reality
12' with expect the error of total resistance more than 0.5 ohm and each digital regulation resistance exponent number is set number of times is set more than 18 times, determine the exponent number needing to adjust each digital regulation resistance.
Then, when predetermined constraints condition meets, then described adjustment unit 23 determines resistance resize ratio based on the value of feedback of the coherent signal of described circuit and desired value, and the adjustment amount of each digital regulation resistance exponent number is determined based on the current resistance of described resize ratio and variable resistance unit, aforementioned execution again judges operation subsequently.。
Particularly, if the dependency relation of the resistance R of the coherent signal Y of circuit and variable resistance unit is: Y=K*R
t+ A, wherein, K, t, A are constant, thus, the desired value Y of this coherent signal Y
expectresistance R total with the expectation of variable resistance unit
expectrelation can be expressed as: Y
expect=K*R
t expect+ A, namely: R
expect=(Y
expect-A)
-t/ K;
Correspondingly, the actual total resistance R of variable resistance
actualwith the value of feedback Y of coherent signal Y
actualpass is: R
actual=(Y
actual-A)
-t/ K;
Two formulas are divided by and can be obtained:
Thus, the resistance of variable resistance unit is adjusted to current resistance by described adjustment unit 23
doubly.
Such as, for the circuit shown in Fig. 3, the total resistance R of expectation of variable resistance unit
expectwith the pass of the desired value V of output voltage be: R
expect=V
ref* R
1/ (V-V
ref);
The total resistance R of reality of variable resistance unit
actualwith the value of feedback V of output voltage
tpass is: R
actual=V
ref* R
1/ (V
t-V
ref) two formulas are divided by and can obtain:
If order
then R
expect=k
v* R
actual;
Thus, described adjustment unit 23 determines the k that needs the resistance of variable resistance unit 12 to be adjusted to current resistance
vdoubly, because variable resistance unit 12 is in series by digital regulation resistance R2, R3, namely digital regulation resistance R2, R3 resistance is separately adjusted to the k of current resistance
vtimes, and then described adjustment unit 23 can determine digital regulation resistance R2, R3 exponent number adjustment amount separately based on digital regulation resistance R2, R3 step-length separately.
Those skilled in the art determine the determination mode of the exponent number of each digital regulation resistance based on the total resistance of expectation based on aforementioned exponent number determining unit 21, should be appreciated that described adjustment unit 23 is based on digital regulation resistance R2, R3 step-length separately, determine digital regulation resistance R2, R3 exponent number adjustment amount separately, digital regulation resistance R2, R3 resistance to be separately adjusted to the k of current resistance
vmode doubly, therefore no longer described in detail at this.
As a kind of preferred embodiment, after the error delta Y (i) that aforementioned judging unit 22 also calculates the current value of feedback of described circuit coherent signal and desired value, further judge this error amount Δ Y (i) whether be greater than before the error delta Y (i-1) of once calculated value of feedback and desired value, if, the exponent number of each digital regulation resistance once set before then showing has been local optimum, then described adjustment unit 23 redefines the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
For arbitrary resistance, various combination mode can be adopted to represent.Such as, for 100 ohm, 10 rank of digital regulation resistance RX can be adopted to represent, also 8 rank of digital regulation resistance RX, 4 rank of digital regulation resistance RY can be adopted to represent, if the more all combinations of traversal search, the global optimum that error is minimum can be obtained, if travel through all combinations, the global optimum that error is minimum can be obtained.
Such as, for the circuit shown in Fig. 3, R is worked as
1the step-length L2 of=100k, digital regulation resistance R2 is 10 ohm, and when the step-length L3 of digital regulation resistance R3 is 4 ohm, if the various combinations of traversal digital regulation resistance R2, R3, the output voltage error of acquisition as shown in Figure 4.As seen from the figure, the resistance resolution ratio of adjustable resistance unit 12, up to 0.1 ohm, is far smaller than the L3 of the less digital regulation resistance R3 step-length of step-length.
Although application traversal mode is searched resistance and can be realized very high precision, need hundreds and thousands of search, greatly reduce the response speed of circuit, lack practical value.But, from traversal search pattern, obtain an important enlightenment, even change search initial point and likely find the more figure of merit.For this reason, when Local Search cannot meet required precision, at local optimization value place, the adjustment amount of the exponent number of each digital regulation resistance can be redefined based on previous error delta Y (i-1).
Such as, for the circuit shown in Fig. 3, value of feedback once calculated before the current value of feedback of output voltage and the error of desired value are greater than and the error of desired value, and digital regulation resistance R2, R3 is respectively m1 based on the exponent number after front once determined respective exponent number adjustment amount adjustment, m2, then described regulating system is based on digital regulation resistance R2, the step-length of R3 is determined the exponent number m1 before digital regulation resistance R2 once after adjustment to add 2 than L2:L3=5:2, and the exponent number m2 after once adjusting before digital regulation resistance R3 is subtracted 5, thus, although, (theoretical total resistance is based on formula R for the theoretical total resistance of adjustable resistance unit 12
12=R
2+ R
3calculate) constant, but actual total resistance changes to some extent due to the physics actual error of digital regulation resistance R2, R3 resistance, thus output voltage can be caused to change.
As another kind of preferred embodiment, also judge whether the total resistance of current reality of variable resistance unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation at aforementioned judging unit 22, if, the exponent number of each digital regulation resistance once set before then also showing has been local optimum, then described regulating system redefines the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
Below by by describing the present invention in detail to the description of the circuit shown in Fig. 3:
In the DC power supply circuit 1 of the wide output area shown in Fig. 3, controller 14 comprises aforementioned regulating system 2, after circuit powers on, after the exponent number determining unit 21 of regulating system 2 determines the exponent number of digital regulation resistance R2, R3 based on the desired value of output voltage, described controller 14 arranges the exponent number of digital regulation resistance R2, R3 based on the exponent number that described exponent number determining unit 21 is determined, controller 14 is sampled the value of feedback of voltage-stablizer 11 output voltage subsequently, and by being supplied to the judging unit 22 of regulating system 2 after analog-to-digital conversion, judging unit 22 based on the value of feedback of output voltage and the error of desired value more than the first preset range, determine the exponent number needing to adjust each digital regulation resistance, then the adjustment unit 23 of regulating system 2 determines digital regulation resistance R2 based on the current resistance of variable resistance unit 12 and determined resize ratio, the exponent number adjustment amount of R3, then, controller 14 is based on digital regulation resistance R2, the exponent number adjustment amount of R3 regulates digital regulation resistance R2, the exponent number of R3, to sample again subsequently the value of feedback of voltage-stablizer 11 output voltage, determined whether the exponent number needing again to adjust digital regulation resistance R2, R3 by regulating system 2 based on the value of feedback of this output voltage, so constantly repeat, till predetermined constraints condition no longer meets.
In foregoing circuit, if this DC power supply circuit output voltage range is 5V-60V, as reference voltage level V
refwith feedback resistance R
1when there is not error, as shown in Figure 6, digital regulation resistance R2, R3 arrange number of times as shown in Figure 7 to output voltage error.As shown in Figure 6, output voltage error variation tendency increases with output voltage values and increases; The resistance error of overwhelming majority moment variable resistance unit is lower than 0.5 ohm.Arrange number of times as end condition using 0.5 ohm of error and 18 times, as seen from Figure 7, in the major part moment, the number of times that arranges of digital regulation resistance R2, R3 exponent number is between 2-10.
When variation of ambient temperature is comparatively large or device was selected not at that time, reference voltage level V may be caused
refwith feedback resistance R
1resistance does not meet ideal value, can have an impact to arranging of digital regulation resistance R2, R3 exponent number.Hypothetical reference voltage V
refincrease by 5%, feedback resistance R
1increase by 10%, now the number of times that arranges of DC power output voltage error and digital regulation resistance R2, R3 exponent number is distinguished as shown in Figure 8, Figure 9.As seen from the figure, output voltage error variation tendency is consistent with Fig. 6, and arranges number of times and be not also significantly increased.This illustrates that the control method based on the digital regulation resistance of ratio has good robustness, can overcome various device error.
In sum, of the present invention based on ratio regulate the method and system of digital regulation resistance based on the coherent signal of circuit and the resistance of variable resistance unit linear, and then the exponent number adjustment amount of each digital regulation resistance is determined based on ratio, the error of digital regulation resistance can be effectively reduced; And be optimized search by resetting Searching point in good time, accelerate the setting up procedure of digital regulation resistance, at utmost ensure that the coherent signal of circuit, the precision of such as output voltage.Range of application of the present invention is not limited to DC power system, also can be applicable to the other field needing digital variable resistor.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (9)
1. one kind regulates the control method of digital regulation resistance based on ratio, it is applied to the circuit including the variable resistance unit be made up of multiple digital regulation resistance, and a coherent signal of this circuit is relevant to the resistance of variable resistance unit, it is characterized in that, describedly regulate the control method of digital regulation resistance at least to comprise based on ratio:
1) desired value based on the coherent signal of described circuit determines the total resistance of the expectation of variable resistance unit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation;
2) after the exponent number of each digital regulation resistance is arranged, judge whether predetermined constraints condition meets;
3) when predetermined constraints condition meets, resistance resize ratio is determined based on the value of feedback of the coherent signal of described circuit and desired value, and determine the adjustment amount of each digital regulation resistance exponent number based on the current exponent number of described resize ratio and variable resistance unit, resume at step 2 subsequently); Then terminate when predetermined constraints condition does not meet;
Wherein, described predetermined constraints condition comprises a or b:
A, the described value of feedback of circuit coherent signal and the error of desired value are more than the first preset range, and the number of times that arranges arranging each digital regulation resistance exponent number is less than pre-determined number;
The total resistance of reality of b, described variable resistance unit and the error of the total resistance of expectation are more than the second preset range, and the number of times that arranges arranging each digital regulation resistance exponent number is less than pre-determined number.
2. the control method regulating digital regulation resistance based on ratio according to claim 1, it is characterized in that: when each digital regulation resistance in variable resistance unit is connected, in step 1) and step 3) in, if the resistance of variable resistance unit calculated based on determined exponent number and the residual error of the total resistance of described expectation exceed the half of minimum step, then the exponent number of the digital regulation resistance corresponding to minimum step is added 1 again; If the step-length of the digital regulation resistance of minimum step is 2:5 with the step-length ratio of another digital regulation resistance, then when the resistance of the variable resistance unit calculated based on determined exponent number and the residual error of the total resistance of described expectation exceed 3/4 of minimum step, then the exponent number of the digital regulation resistance corresponding to minimum step is added 1 again; If when the resistance of variable resistance unit that calculate based on determined exponent number and the residual error of the total resistance of described expectation exceed 1/4 of minimum step but do not exceed 3/4 of minimum step, then again the exponent number of the digital regulation resistance corresponding to minimum step is subtracted 2, the exponent number of this another digital regulation resistance adds 1.
3. the control method regulating digital regulation resistance based on ratio according to claim 2, is characterized in that, in step 2) in also comprise:
Judge whether the error of current feedback value and desired value is greater than the error of a front value of feedback and desired value;
Described method also comprises step:
If the error of current feedback value and desired value is greater than the error of a front value of feedback and desired value, then redefine the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
4. the control method regulating digital regulation resistance based on ratio according to claim 2, is characterized in that, in step 2) in also comprise:
Judge whether the total resistance of current reality of variable resistance unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation;
Described method also comprises step:
If the error of the total resistance of current reality of variable resistance unit and the total resistance of described expectation is greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation, then redefine the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
5. one kind regulates the regulating system of digital regulation resistance based on ratio, it is applied to the circuit including the variable resistance unit be made up of multiple digital regulation resistance, and a coherent signal of this circuit is relevant to the resistance of variable resistance unit, it is characterized in that, describedly regulate the regulating system of digital regulation resistance at least to comprise based on ratio:
Exponent number determining unit, the desired value for the coherent signal based on described circuit determines the total resistance of the expectation of variable resistance unit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation;
Judging unit, for after the exponent number of each digital regulation resistance is arranged, judges whether predetermined constraints condition meets;
Adjustment unit, for when predetermined constraints condition meets, determine resistance resize ratio based on the value of feedback of the coherent signal of described circuit and desired value, and determine the adjustment amount of each digital regulation resistance exponent number based on the current exponent number of described resize ratio and variable resistance unit; Then terminate when predetermined constraints condition does not meet;
Wherein, described predetermined constraints condition comprises a or b:
A, the described value of feedback of circuit coherent signal and the error of desired value are more than the first preset range, and the number of times that arranges arranging each digital regulation resistance exponent number is less than pre-determined number;
The total resistance of reality of b, described variable resistance unit and the error of the total resistance of expectation are more than the second preset range, and the number of times that arranges arranging each digital regulation resistance exponent number is less than pre-determined number.
6. the regulating system regulating digital regulation resistance based on ratio according to claim 5, it is characterized in that: when each digital regulation resistance in variable resistance unit is connected, if the resistance of variable resistance unit calculated based on determined exponent number and the residual error of the total resistance of described expectation exceed the half of minimum step, then the exponent number of the digital regulation resistance corresponding to minimum step is added 1 by exponent number determining unit or adjustment unit again; If the step-length of the digital regulation resistance of minimum step is 2:5 with the step-length ratio of another digital regulation resistance, then when the resistance of the variable resistance unit calculated based on determined exponent number and the residual error of the total resistance of described expectation exceed 3/4 of minimum step, then the exponent number of the digital regulation resistance corresponding to minimum step is added 1 by exponent number determining unit or adjustment unit again; If when the resistance of variable resistance unit that calculate based on determined exponent number and the residual error of the total resistance of described expectation exceed 1/4 of minimum step but do not exceed 3/4 of minimum step, then the exponent number of the digital regulation resistance corresponding to minimum step is subtracted 2 by exponent number determining unit or adjustment unit again, the exponent number of this another digital regulation resistance adds 1.
7. the regulating system regulating digital regulation resistance based on ratio according to claim 6, is characterized in that, described judging unit also for:
Judge whether the error of value of feedback and desired value is greater than the error of a front value of feedback and desired value;
Described adjustment unit also for:
If the error of current feedback value and desired value is greater than the error of a front value of feedback and desired value, then redefine the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
8. the regulating system regulating digital regulation resistance based on ratio according to claim 6, is characterized in that, described judging unit also for:
Judge whether the total resistance of current reality of variable resistance unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation;
Described adjustment unit also for:
If the error of the total resistance of current reality of variable resistance unit and the total resistance of described expectation is greater than the total resistance of previous reality of variable resistance unit and the error of the total resistance of described expectation, then redefine the adjustment amount of each digital regulation resistance exponent number based on the error of previous value of feedback and desired value.
9. a DC power supply circuit for wide output area, is characterized in that: the DC power supply circuit of described wide output area at least comprises: direct current stabilizer;
Comprise the resistor network of variable resistance unit, be connected with described direct current stabilizer, for regulating the output voltage of described direct current stabilizer, wherein, described variable resistance unit comprises multiple digital regulation resistance;
Controller, comprises the regulating system according to any one of claim 5 to 8, and it is connected to described direct current stabilizer output, for arranging the resistance of each digital regulation resistance and gathering the output voltage of described direct current stabilizer.
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| CN104953816B (en) * | 2014-03-26 | 2017-11-17 | 华为技术有限公司 | Determine the method and device of dynamic regulation of voltage values of circuit resistances |
| CN103984382B (en) * | 2014-05-27 | 2015-10-14 | 中国科学院上海高等研究院 | A kind of method to set up of digital regulation resistance exponent number of connecting |
| CN107748589A (en) * | 2017-10-18 | 2018-03-02 | 京东方科技集团股份有限公司 | A kind of adjustable circuit of output voltage and its voltage adjusting method and display device |
| CN108363324A (en) * | 2018-03-20 | 2018-08-03 | 广西钦州福晟电子有限公司 | A kind of device improving digital regulation resistance resolution ratio |
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