CN103488224A - 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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- CN103488224A CN103488224A CN201310471366.2A CN201310471366A CN103488224A CN 103488224 A CN103488224 A CN 103488224A CN 201310471366 A CN201310471366 A CN 201310471366A CN 103488224 A CN103488224 A CN 103488224A
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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 the digital circuit field, particularly relate to a kind of control method, system and DC power supply circuit of regulating digital regulation resistance 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, carrys out regulation output voltage with feedback resistive network simultaneously.As long as change resistance in feedback resistive network, can dynamically adjust output voltage according to loading demand, realize accurate high efficiency power.
Development and maturation along with the digital regulation resistance technology, in increasing application, mechanical variable resistance in feedback resistive network is replaced by digital regulation resistance, product stability, numerical and intelligent level have not only been improved thus, also can reduce the circuit volume and increase the service life, as be in each Chinese patent literature of 200620069824.5,201010512246.9 and 201120377518.9 at application number, the circuit of various employing digital regulation resistances etc. is disclosed.But also there are many deficiencies in digital regulation resistance, as low as resistance resolution poor with high voltage performance, the resistance error large and temperature is floated seriously.The problems referred to above have greatly limited digital regulation resistance applying in the high precision field.
The 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 that Fig. 1 is 10K for certain external large-scale producer nominal resistance distribute.As seen from the figure, the end-to-end R of this digital regulation resistance
aBthe resistance error reaches 8%.Although after end-to-end resistance correction, differential non-linearity errors is less, considers sliding end R
werror and temperature are floated factor, and in practice, integral non-linear error often surpasses 5LSB.
The existing circuit that adopts digital regulation resistance, all often to calculate the resistance of digital regulation resistance according to ideal formula, and then the corresponding exponent number of configuration digital regulation resistance, due to the error of not considering digital regulation resistance self (may arrive hundreds of ohm), can have a strong impact on thus the precision of circuit.
Summary of the invention
The shortcoming of prior art, the object of the present invention is to provide a kind of control method and system of regulating digital regulation resistance based on ratio, to effectively reduce the error of digital regulation resistance in view of the above.
Another object of the present invention is to provide a kind of DC power supply circuit of wide output area.
Reach for achieving the above object other relevant purposes, the invention provides a kind of control method of regulating digital regulation resistance based on ratio, it is applied to comprise the circuit of the variable resistor unit consisted of a plurality of digital regulation resistances, and a coherent signal of this circuit is relevant to the resistance of variable resistor unit, the described control method of regulating digital regulation resistance based on ratio at least comprises:
1) expectation value of the coherent signal based on described circuit is determined the total resistance of expectation of variable resistor 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 arranges, judge whether the predetermined constraints condition meets;
3) when the predetermined constraints condition meets, the value of feedback of the coherent signal based on described circuit and expectation value are determined the resistance resize ratio, and the current exponent number based on described resize ratio and variable resistor unit determines the adjustment amount of each digital regulation resistance exponent number, return to subsequently step 2);
Wherein, described predetermined constraints condition comprises a or b:
The value of feedback of a, described circuit coherent signal and the error of expectation value surpass in the first preset range, and the number of times of each digital regulation resistance of resetting is less than pre-determined number;
The total resistance of reality of b, described variable resistor unit surpasses in the second preset range with the error of the total resistance of expectation, and the number of times of each digital regulation resistance of resetting is less than pre-determined number.
The present invention also provides a kind of regulating system of regulating digital regulation resistance based on ratio, it is applied to comprise the circuit of the variable resistor unit consisted of a plurality of digital regulation resistances, and a coherent signal of this circuit is relevant to the resistance of variable resistor unit, described regulating system of based on ratio, regulating digital regulation resistance at least comprises:
The exponent number determining unit, determine the total resistance of expectation of variable resistor unit for the expectation value of the coherent signal based on described circuit, and determine the exponent number of each digital regulation resistance based on the total resistance of described expectation;
Judging unit, after arranging for the exponent number when each digital regulation resistance, judge whether the predetermined constraints condition meets;
Adjustment unit, determine the resistance resize ratio for value of feedback and the expectation value of the coherent signal based on described circuit, and the current exponent number based on described resize ratio and variable resistor unit is determined the adjustment amount of each digital regulation resistance exponent number;
Wherein, described predetermined constraints condition comprises a or b:
The value of feedback of the coherent signal of a, described circuit and the error of expectation value surpass the first preset range, and the number of times of each digital regulation resistance of resetting is less than pre-determined number;
The total resistance of reality of b, described variable resistor unit surpasses the second preset range with the error of the total resistance of expectation, and the number of times of each digital regulation resistance of resetting 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;
The resistor network that comprises the variable resistor unit, be connected with described direct current stabilizer, and for regulating the output voltage of described direct current stabilizer, wherein, described variable resistor unit comprises a plurality of digital regulation resistances;
Controller, comprise aforementioned regulating system, and it is connected to described direct current stabilizer output terminal, for the resistance that each digital regulation resistance is set and the output voltage that gathers described direct current stabilizer.
As mentioned above, method, system and the circuit of regulating digital regulation resistance based on ratio of the present invention has following beneficial effect: the relevant and characteristic that the digital regulation resistance differential non-linearity errors is little of the resistance of the coherent signal based on circuit and variable resistor unit is eliminated higher integral non-linear error; And the search point of in good time resetting is optimized search, accelerate the digital regulation resistance layoutprocedure, at utmost guaranteed the output accuracy of direct supply.
The accompanying drawing explanation
Fig. 1 is shown as the 10 bit digital potentiometer resistance error distribution schematic diagrams that existing certain producer's nominal resistance is 10K.
Fig. 2 is shown as the control method process flow diagram of 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 the application traversal and realizes output voltage error schematic diagram after global optimum.
Fig. 5 is shown as the regulating system schematic diagram of regulating digital regulation resistance based on ratio of the present invention.
Fig. 6 is shown as the reference voltage of the circuit shown in Fig. 3 and feedback resistance output voltage error schematic diagram while not having error.
Fig. 7 be shown as the reference voltage of the circuit shown in Fig. 3 and feedback resistance while not having error the digital regulation resistance exponent number number of times schematic diagram is set.
Fig. 8 is shown as the reference voltage of the circuit shown in Fig. 3 and feedback resistance output voltage error schematic diagram while having error.
Fig. 9 be shown as the reference voltage of the circuit shown in Fig. 3 and feedback resistance while having error the digital regulation resistance exponent number number of times schematic diagram is set.
The element numbers explanation
1 DC-stabilized circuit
11 voltage stabilizers
12 variable resistor unit
13 loads
14 controllers
2 regulating systems
21 exponent number determining units
22 judging units
23 adjustment units
S1～S3 step
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this instructions.The present invention can also be implemented or be applied by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications 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, satisfy in graphic and only show with assembly relevant in the present invention but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 2, the invention provides a kind of control method of regulating digital regulation resistance based on ratio.Wherein, the method according to this invention mainly completes by regulating system, and this regulating system includes but not limited to be arranged in controller and can realize application module of the present invention program etc.
Wherein, described control method is mainly used in the circuit that comprises the variable resistor unit, and described variable resistor unit comprises a plurality of digital regulation resistances, 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 this circuit, there is the resistance of a coherent signal and variable resistor unit linear.Preferably, described circuit includes but not limited to DC-stabilized circuit etc.
For example, as shown in Figure 3, this DC-stabilized circuit 1 comprises voltage stabilizer 11, variable resistor unit 12, the resistance R 1 that connects described variable resistor unit 12 and the controller 14 in series by digital regulation resistance R2, R3, the feedback resistive network of this variable resistor unit 12 and resistance R 1 voltage stabilizer 11 in series, this voltage stabilizer 11 is to load 13 output dc voltage V, and this output voltage V and variable resistor unit 12 resistance R
12be correlated with, that is: V=V
ref* (R
1/ R
12+ 1), wherein, V
reffor reference voltage.
In step S1, the expectation value of the coherent signal of described regulating system based on described circuit is determined the total resistance of expectation of variable resistor unit, and determines the exponent number of each digital regulation resistance based on the total resistance of described expectation.
Particularly, described regulating system first the incidence relation of the coherent signal of the resistance based on variable resistor unit in circuit and circuit determine the variable resistor unit the total resistance of expectation, then the step-length of the connected mode of the digital regulation resistance comprised based on the variable resistor unit and each digital regulation resistance is determined the exponent number of each digital regulation resistance.
For example, for the DC-stabilized circuit 1 shown in Fig. 3, digital regulation resistance R2, R3 that variable resistor unit 12 comprises connect with series system, and step-length separately is L2, L3, if the expectation value of voltage stabilizer 11 output voltages is V
0, described regulating system is according to output voltage V and variable resistor unit 12 resistance R
12relational expression: V=V
ref* (R
1/ R
12+ 1) the total resistance of expectation of determining variable resistor unit 12 is R
0; Subsequently, the described regulating system total resistance R of the theory based on variable resistor unit 12 again
12=R
2+ R
3determine the exponent number of digital regulation resistance R2, R3.As exponent number N
2, N
3be at 0 o'clock, the theoretical all-in resistance R of variable resistor unit 12
12(0); Subsequently, the described regulating system step-length L2 of larger digital regulation resistance R2 and expect total resistance R based on step-length again
0with theoretical all-in resistance R
12(0) departure Δ R=R
0-R
12(0), determine the exponent number N of the digital regulation resistance R2 that step-length is larger
2=Δ R|L2, " | " means to divide exactly; Calculate again subsequently the residual delta r=Δ R-N2*L2 of the departure Δ R after over-compensation; And then based on step-length the step-length L3 of less digital regulation resistance R3 and the exponent number N that residual delta r determines digital regulation resistance R3
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 again the connected mode based on each digital regulation resistance and each digital regulation resistance step-length separately adjust determined exponent number, further to reduce final remaining residual error.
For example, for the variable resistor unit in series by digital regulation resistance, if final remaining residual error surpasses minimum step half, the exponent number of described regulating system digital regulation resistance that minimum step is corresponding adds 1 again, thus, can make final remaining residual error be no more than half of minimum step.
Again for example, the variable resistor unit in series for two digital regulation resistances that are respectively L11 and L12 by step-length, if the ratio of step-length L11 and L12 is 5:2, if final remaining residual error is greater than 3/4ths of minimum step L12, described regulating system adds 1 again by the exponent number of the digital regulation resistance of the correspondence of minimum step L12, thus, can make final remaining residual error be down to minimum step L12 1/4th in; If final remaining residual error surpass minimum step L12 1/4th and be no more than 3/4ths of minimum step L12, the exponent number of the digital regulation resistance that exponent number of described regulating system corresponding digital regulation resistance by step-length L11 adds 1 again, minimum step L12 is corresponding subtracts 2 again, can make thus final remaining residual error be reduced to minimum step L12 1/4th in.
Then, in step S2, after each digital regulation resistance exponent number arranges, described regulating system judges whether the predetermined constraints condition meets, if, enter step S3, finish if not.
Wherein, described predetermined constraints condition comprises any condition that can be used for determining whether to need to adjust each digital regulation resistance exponent number, preferably, include but not limited to following one: a) error of the value of feedback of the coherent signal of described circuit and expectation value surpasses the first preset range, and the number of times of each digital regulation resistance of resetting is less than pre-determined number; B) the total resistance of reality of described variable resistor unit surpasses the second preset range with the error of the total resistance of expectation, and the number of times that each digital regulation resistance is set is less than pre-determined number.
Wherein, the value of feedback of the coherent signal of described circuit can gather voluntarily by described regulating system, collecting unit that also can be in circuit, and for example, controller provides etc.
Wherein, the total resistance of reality of described variable resistor unit calculates according to the value of feedback of the coherent signal of circuit and the coherent signal of circuit and the incidence relation of variable resistor cell resistance.
For example, for circuit shown in Fig. 3, after determined each digital regulation resistance exponent number arranges each digital regulation resistance in based on step S1, the value of feedback V of described regulating system based on circuit output voltage
0' and the resistance of output voltage and variable resistor unit between the incidence relation formula: V=V
ref* (R
1/ R
12+ 1) the total resistance of reality of determining the variable resistor unit is R
12', and be R based on the total resistance of reality
12' surpass 0.5 ohm and the number of times that arranges that each digital regulation resistance exponent number is set with the error of the total resistance of expectation and surpass 18 times, determine the exponent number that needs to adjust each digital regulation resistance.
Then, in step S3, when the predetermined constraints condition meets, the value of feedback of the coherent signal of described regulating system based on described circuit and expectation value are determined the resistance resize ratio, and the current resistance based on described resize ratio and variable resistor unit determines the adjustment amount of each digital regulation resistance exponent number, return to subsequently step S2.
Particularly, if the correlationship of the resistance R of the coherent signal Y of circuit and variable resistor unit be: Y=K*R
t+ A, wherein, K, t, A are constant, thus, the expectation value Y of this coherent signal Y
expectationwith the total resistance R of the expectation of variohm unit
expectationrelation can be expressed as: Y
expectation=K*R
t expectation+ A, namely: R
expectation=(Y
expectation-A)
-t/ K;
Correspondingly, the actual total resistance R of variohm
actualvalue of feedback Y with coherent signal Y
actualpass is: R
actual=(Y
actual-A)
-t/ K;
Two formulas are divided by and can be obtained:
Thereby described regulating system is adjusted into current resistance by the resistance of variable resistor unit
doubly get final product.
For example, for the circuit shown in Fig. 3, the total resistance R of the expectation of variable resistor unit
expectationwith the pass of the expectation value V of output voltage, be: R
expectation=V
ref* R
1/ (V-V
ref);
The total resistance R of the reality of variable resistor unit
actualvalue of feedback V with output voltage
tpass is: R
actual=V
ref* R
1/ (V
t-V
ref) two formulas are divided by and can obtain:
If order
r
expectation=k
v* R
actual;
Thus, described regulating system is definite need to be adjusted into the resistance of variable resistor unit 12 k of current resistance
vdoubly, because variable resistor unit 12 is in series by digital regulation resistance R2, R3, namely by digital regulation resistance R2, R3, resistance separately is adjusted into the k of current resistance
vdoubly, so described regulating system based on digital regulation resistance R2, R3 step-length separately can determine digital regulation resistance R2, R3 exponent number adjustment amount separately.
Those skilled in the art determine definite 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 based on digital regulation resistance R2, R3 step-length separately, determine digital regulation resistance R2, R3 exponent number adjustment amount separately, so that resistance by digital regulation resistance R2, R3 separately is adjusted into 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 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, the R12 of variable resistor unit, R13 also can be Y=K11 * R11+K12 * R12+K13 * R13 etc., and wherein, K11, K12, K13 not exclusively equate or be different.
As a kind of optimal way, in abovementioned steps S2, after described regulating system is calculated the error delta Y (i) of the current value of feedback of described circuit coherent signal and expectation value, further judge before whether this error amount Δ Y (i) is greater than the value of feedback that once calculated and the error delta Y (i-1) of expectation value, if, before showing once the exponent number of each set digital regulation resistance be local optimum,, in abovementioned steps S3, the error of described regulating system based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
For arbitrary resistance, can adopt the various combination mode to be meaned.The more all array modes of traversal search for example, for 100 ohm, can adopt 10 rank of digital regulation resistance RX to mean, also can adopt 8 rank of digital regulation resistance RX, 4 rank of digital regulation resistance RY to mean, if can obtain the global optimum of error minimum.
For example, for the circuit shown in Fig. 3, work as R
1=100k, the step-length L2 of digital regulation resistance R2 is 10 ohm, when the step-length L3 of digital regulation resistance R3 is 4 ohm, if the various array modes of traversal digital regulation resistance R2, R3, the output voltage error of acquisition is as shown in Figure 4.As seen from the figure, the resistance resolution of adjustable resistance unit 12, up to 0.1 ohm, is far smaller than the L3 of the digital regulation resistance R3 step-length that step-length is less.
Although application traversal mode is searched resistance and can be realized very high precision, needs hundreds and thousands of search, has greatly reduced the response speed of circuit, lacks practical value.But, from the traversal search pattern, obtain an important enlightenment, even change the search initial point and likely find the more figure of merit., can't meet at Local Search under the situation of accuracy requirement for this reason, can, at local optimization value place, redefine the adjustment amount of the exponent number of each digital regulation resistance based on previous error delta Y (i-1).
For example, for the circuit shown in Fig. 3, the value of feedback that once calculated before the difference of the current value of feedback of output voltage and expectation value is greater than and expectation value poor, and digital regulation resistance R2, the exponent number of R3 after based on front once determined exponent number adjustment amount adjustment separately is respectively m1, m2, described regulating system is based on digital regulation resistance R2, the step-length of R3 adds 2 than L2:L3=5:2 is definite by the exponent number m1 after once adjusting before digital regulation resistance R2, and the exponent number m2 after once adjusting before digital regulation resistance R3 is subtracted to 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 the change to some extent due to the physics actual error of digital regulation resistance R2, R3 resistance of actual total resistance, thereby can cause output voltage to change.
As another kind of optimal way, in abovementioned steps S2, described regulating system judges whether the total resistance of current reality of variable resistor unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistor unit and the error of the total resistance of described expectation, if, before also showing once the exponent number of each set digital regulation resistance be local optimum,, in abovementioned steps S3, the error of described regulating system based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
It should be noted that, when at local optimization value place, also can be directly by previous, be provided as final setting, stop whole setting up procedure.
As shown in Figure 5, the invention provides a kind of regulating system of 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 that comprises the variable resistor unit, and described variable resistor unit comprises a plurality of digital regulation resistances, 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 this circuit, there is a coherent signal relevant to the resistance of variable resistor unit.Preferably, described circuit includes but not limited to DC-stabilized circuit etc.
For example, as shown in Figure 3, this DC-stabilized circuit 1 comprises voltage stabilizer 11, variable resistor unit 12, the resistance R 1 that connects described variable resistor unit 12 and the controller 14 in series by digital regulation resistance R2, R3, described regulating system 2 is arranged in described controller 14, the feedback resistive network of this variable resistor unit 12 and resistance R 1 voltage stabilizer 11 in series, this voltage stabilizer 11 is to load 13 output dc voltage V, and this output voltage V and variable resistor unit 12 resistance R
12linear, that is: V=V
ref* (R
1/ R
12+ 1), wherein, V
reffor reference voltage.
At first, the expectation value of the coherent signal of described exponent number determining unit 21 based on described circuit is determined the total resistance of expectation of variable resistor unit, 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 the linear correlation relation of the coherent signal of the resistance based on variable resistor unit in circuit and circuit determine the variable resistor unit the total resistance of expectation, then the step-length of the connected mode of the digital regulation resistance comprised based on the variable resistor unit and each digital regulation resistance is determined the exponent number of each digital regulation resistance.
For example, for the DC-stabilized circuit 1 shown in Fig. 3, digital regulation resistance R2, R3 that variable resistor unit 12 comprises connect with series system, and step-length separately is L2, L3, if the expectation value of voltage stabilizer 11 output voltages is V
0, described exponent number determining unit 21 is according to output voltage V and variable resistor unit 12 resistance R
12relational expression: V=V
ref* (R
1/ R
12+ 1) the total resistance of expectation of determining variable resistor unit 12 is R
0; Subsequently, the described exponent number determining unit 21 total resistance R of the theory based on variable resistor unit 12 again
12=R
2+ R
3determine the exponent number of digital regulation resistance R2, R3.As exponent number N
2, N
3be at 0 o'clock, the theoretical all-in resistance R of variable resistor unit 12
12(0); Subsequently, the described regulating system step-length L2 of larger digital regulation resistance R2 and expect total resistance R based on step-length again
0with theoretical all-in resistance R
12(0) departure Δ R=R
0-R
12(0), determine the exponent number N of the digital regulation resistance R2 that step-length is larger
2=Δ R|L2, " | " means to divide exactly; Calculate again subsequently the residual delta r=Δ R-N2*L2 of the departure Δ R after over-compensation; And then based on step-length the step-length L3 of less digital regulation resistance R3 and the exponent number N that residual delta r determines digital regulation resistance R3
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 again the connected mode based on each digital regulation resistance and each digital regulation resistance step-length separately adjust determined exponent number, further to reduce final remaining residual error.
For example, for the variable resistor unit in series by digital regulation resistance, if final remaining residual error surpasses minimum step half, the exponent number of described exponent number determining unit 21 digital regulation resistance that minimum step is corresponding adds 1 again, thus, can make final remaining residual error be no more than half of minimum step.
Again for example, the variable resistor unit in series for two digital regulation resistances that are respectively L11 and L12 by step-length, if the ratio of step-length L11 and L12 is 5:2, if final remaining residual error is greater than 3/4ths of minimum step L12, described exponent number determining unit 21 adds 1 again by the exponent number of the digital regulation resistance of the correspondence of minimum step L12, thus, can make final remaining residual error be down to minimum step L12 1/4th in; If final remaining residual error surpass minimum step L12 1/4th and be no more than 3/4ths of minimum step L12, the exponent number of the digital regulation resistance that exponent number of described exponent number determining unit 21 corresponding digital regulation resistance by step-length L11 adds 1 again, minimum step L12 is corresponding subtracts 2 again, can make thus final remaining residual error further reduce.
Then, in step S2, after each digital regulation resistance exponent number arranges, described judging unit 22 judges whether the predetermined constraints condition meets, if, start adjustment unit 23, finish if not.
Wherein, described predetermined constraints condition comprises any condition that can be used for determining whether to need to adjust each digital regulation resistance exponent number, preferably, include but not limited to following one: a) error of the value of feedback of the coherent signal of described circuit and expectation value surpasses the first preset range, and the number of times that each digital regulation resistance is set is less than pre-determined number; B) the total resistance of reality of described variable resistor unit surpasses the second preset range with the error of the total resistance of expectation, and the number of times that each digital regulation resistance is set is less than pre-determined number.
Wherein, the value of feedback of the coherent signal of described circuit can gather voluntarily by described regulating system 2, collecting unit that also can be in circuit, and for example, controller provides etc.
Wherein, the total resistance of reality of described variable resistor unit calculates according to the value of feedback of the coherent signal of circuit and the coherent signal of circuit and the correlationship of variable resistor cell resistance.
For example, for circuit shown in Fig. 3, after based on exponent number determining unit 21, determined each digital regulation resistance exponent number arranges each digital regulation resistance, the value of feedback V of described judging unit 22 based on circuit output voltage
0' and the resistance of output voltage and variable resistor unit between linear relation: V=V
ref* (R
1/ R
12+ 1) the total resistance of reality of determining the variable resistor unit is R
12', and be R based on the total resistance of reality
12' surpass 0.5 ohm and the number of times that arranges that each digital regulation resistance exponent number is set with the error of the total resistance of expectation and surpass 18 times, determine the exponent number that needs to adjust each digital regulation resistance.
Then, when the predetermined constraints condition meets, the value of feedback of the coherent signal of described adjustment unit 23 based on described circuit and expectation value are determined the resistance resize ratio, and the current resistance based on described resize ratio and variable resistor unit determines the adjustment amount of each digital regulation resistance exponent number, the aforementioned decision operation of carrying out again subsequently.。
Particularly, if the correlationship of the resistance R of the coherent signal Y of circuit and variable resistor unit be: Y=K*R
t+ A, wherein, K, t, A are constant, thus, the expectation value Y of this coherent signal Y
expectationwith the total resistance R of the expectation of variohm unit
expectationrelation can be expressed as: Y
expectation=K*R
t expectation+ A, namely: R
expectation=(Y
expectation-A)
-t/ K;
Correspondingly, the actual total resistance R of variohm
actualvalue of feedback Y with coherent signal Y
actualpass is: R
actual=(Y
actual-A)
-t/ K;
Two formulas are divided by and can be obtained:
Thereby described adjustment unit 23 is adjusted into current resistance by the resistance of variable resistor unit
doubly get final product.
For example, for the circuit shown in Fig. 3, the total resistance R of the expectation of variable resistor unit
expectationwith the pass of the expectation value V of output voltage, be: R
expectation=V
ref* R
1/ (V-V
ref);
The total resistance R of the reality of variable resistor unit
actualvalue of feedback V with output voltage
tpass is: R
actual=V
ref* R
1/ (V
t-V
ref) two formulas are divided by and can obtain:
If order
r
expectation=k
v* R
actual;
Thus, described adjustment unit 23 is definite need to be adjusted into the resistance of variable resistor unit 12 k of current resistance
vdoubly, because variable resistor unit 12 is in series by digital regulation resistance R2, R3, namely by digital regulation resistance R2, R3, resistance separately is adjusted into the k of current resistance
vdoubly, so described adjustment unit 23 based on digital regulation resistance R2, R3 step-length separately can determine digital regulation resistance R2, R3 exponent number adjustment amount separately.
Those skilled in the art determine definite 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 based on digital regulation resistance R2, R3 step-length separately, determine digital regulation resistance R2, R3 exponent number adjustment amount separately, so that resistance by digital regulation resistance R2, R3 separately is adjusted into the k of current resistance
vmode doubly, therefore no longer described in detail at this.
As a kind of optimal way, also calculate the error delta Y (i) of the current value of feedback of described circuit coherent signal and expectation value at aforementioned judging unit 22 after, further judge before whether this error amount Δ Y (i) is greater than the value of feedback that once calculated and the error delta Y (i-1) of expectation value, if, before showing once the exponent number of each set digital regulation resistance be local optimum, the error of described adjustment unit 23 based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
For arbitrary resistance, can adopt the various combination mode to be meaned.For example, for 100 ohm, can adopt 10 rank of digital regulation resistance RX to mean, also can adopt 8 rank of digital regulation resistance RX, 4 rank of digital regulation resistance RY to mean, if the more all array modes of traversal search, the global optimum of error minimum can be obtained, if travel through all array modes, the global optimum of error minimum can be obtained.
For example, for the circuit shown in Fig. 3, work as R
1=100k, the step-length L2 of digital regulation resistance R2 is 10 ohm, when the step-length L3 of digital regulation resistance R3 is 4 ohm, if the various array modes of traversal digital regulation resistance R2, R3, the output voltage error of acquisition is as shown in Figure 4.As seen from the figure, the resistance resolution of adjustable resistance unit 12, up to 0.1 ohm, is far smaller than the L3 of the digital regulation resistance R3 step-length that step-length is less.
Although application traversal mode is searched resistance and can be realized very high precision, needs hundreds and thousands of search, has greatly reduced the response speed of circuit, lacks practical value.But, from the traversal search pattern, obtain an important enlightenment, even change the search initial point and likely find the more figure of merit., can't meet at Local Search under the situation of accuracy requirement for this reason, can, at local optimization value place, redefine the adjustment amount of the exponent number of each digital regulation resistance based on previous error delta Y (i-1).
For example, for the circuit shown in Fig. 3, the value of feedback that once calculated before the error of the current value of feedback of output voltage and expectation value is greater than and the error of expectation value, and digital regulation resistance R2, the exponent number of R3 after based on front once determined exponent number adjustment amount adjustment separately is respectively m1, m2, described regulating system is based on digital regulation resistance R2, the step-length of R3 adds 2 than L2:L3=5:2 is definite by the exponent number m1 after once adjusting before digital regulation resistance R2, and the exponent number m2 after once adjusting before digital regulation resistance R3 is subtracted to 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 the change to some extent due to the physics actual error of digital regulation resistance R2, R3 resistance of actual total resistance, thereby can cause output voltage to change.
As another kind of optimal way, also judge at aforementioned judging unit 22 whether the total resistance of current reality of variable resistor unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistor unit and the error of the total resistance of described expectation, if, before also showing once the exponent number of each set digital regulation resistance be local optimum, the error of described regulating system based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
Below will the present invention be described in detail in detail by the description of the circuit to 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 expectation value of exponent number determining unit 21 based on output voltage of regulating system 2 determined the exponent number of digital regulation resistance R2, R3, described controller 14 arranges the exponent number of digital regulation resistance R2, R3 based on the definite exponent number of described exponent number determining unit 21, the value of feedback of the voltage stabilizer of controller 14 sampling subsequently 11 output voltages, and by the judging unit 22 that offers regulating system 2 after analog to digital conversion, the error of the value of feedback of judging unit 22 based on output voltage and expectation value surpasses the first preset range, determine the exponent number that needs to adjust each digital regulation resistance, current resistance and the determined resize ratio of the adjustment unit 23 of regulating system 2 based on variable resistor unit 12 determined digital regulation resistance R2, the exponent number adjustment amount of R3, then, controller 14 is based on digital regulation resistance R2, the exponent number adjustment amount of R3 is regulated digital regulation resistance R2, the exponent number of R3, sample the again subsequently value of feedback of voltage stabilizer 11 output voltages, the value of feedback by regulating system 2 based on this output voltage determines whether again to adjust the exponent number of digital regulation resistance R2, R3, so constantly repeats, until the 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
1while not having 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, the output voltage error variation tendency increases with output voltage values; The resistance error of overwhelming majority moment variable resistor unit is lower than 0.5 ohm.Using 0.5 ohm of error and number of times is set as end condition 18 times, as seen from Figure 7, constantly most of, digital regulation resistance R2, R3 exponent number number of times is set between 2-10.
When variation of ambient temperature is large or device was selected not at that time, may cause reference voltage level V
refwith feedback resistance R
1resistance does not meet ideal value, to arranging of digital regulation resistance R2, R3 exponent number, can exert an influence.Hypothetical reference voltage V
refincrease by 5%, feedback resistance R
1increase by 10%, now DC power output voltage error and digital regulation resistance R2, R3 exponent number arranges number of times respectively as shown in Figure 8, Figure 9.As seen from the figure, the output voltage error variation tendency is consistent with Fig. 6, and also not obviously increase of number of times is set.The control method of the digital regulation resistance of this explanation based on ratio has good robustness, can overcome various device errors.
In sum, the resistance of the coherent signal of method and system of regulating digital regulation resistance based on ratio of the present invention based on circuit and variable resistor unit is linear, and then determine the exponent number adjustment amount of each digital regulation resistance based on ratio, can effectively reduce the error of digital regulation resistance; And be optimized search by good time replacement search point, and accelerated the setting up procedure of digital regulation resistance, at utmost guaranteed the coherent signal of circuit, for example the precision of output voltage.Range of application of the present invention is not limited to DC power system, also can be applicable to need the other field of digital variable resistor.So the present invention has effectively overcome various shortcoming of the prior art and the 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 can, under spirit of the present invention and category, be modified or be changed above-described embodiment.Therefore, such as in affiliated technical field, have and usually know that the knowledgeable, not breaking away from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (9)
1. a control method of regulating digital regulation resistance based on ratio, it is applied to include the circuit of the variable resistor unit consisted of a plurality of digital regulation resistances, and a coherent signal of this circuit is relevant to the resistance of variable resistor unit, it is characterized in that, the described control method of regulating digital regulation resistance based on ratio at least comprises:
1) expectation value of the coherent signal based on described circuit is determined the total resistance of expectation of variable resistor 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 arranges, judge whether the predetermined constraints condition meets;
3) when the predetermined constraints condition meets, the value of feedback of the coherent signal based on described circuit and expectation value are determined the resistance resize ratio, and the current exponent number based on described resize ratio and variable resistor unit determines the adjustment amount of each digital regulation resistance exponent number, return to subsequently step 2);
Wherein, described predetermined constraints condition comprises a or b:
The value of feedback of a, described circuit coherent signal and the error of expectation value surpass in the first preset range, and the number of times that arranges that each digital regulation resistance exponent number is set is less than pre-determined number;
The total resistance of reality of b, described variable resistor unit surpasses in the second preset range with the error of the total resistance of expectation, and the number of times that arranges that each digital regulation resistance exponent number is set is less than pre-determined number.
2. the control method of regulating digital regulation resistance based on ratio according to claim 1, it is characterized in that: when each digital regulation resistance in the variable resistor unit is connected, in step 1) and step 3), if the residual error of the resistance of the variable resistor unit calculated based on determined exponent number and the total resistance of described expectation surpasses minimum step half, the exponent number of the corresponding digital regulation resistance of minimum step is added to 1 again; If the step-length of the digital regulation resistance of minimum step is 2:5 with the step-length of another digital regulation resistance ratio, work as the resistance of the variable resistor unit calculated based on determined exponent number and the residual error of the total resistance of described expectation and surpass 3/4 of minimum step, the exponent number of the corresponding digital regulation resistance of minimum step is added to 1 again; If when the residual error of the resistance of the variable resistor unit that calculate based on determined exponent number and the total resistance of described expectation surpass minimum step 1/4 but over 3/4 of minimum step, again the exponent number of the corresponding digital regulation resistance of minimum step is subtracted to 2, the exponent number of this another digital regulation resistance adds 1.
3. the control method of 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 value of feedback and expectation value is greater than the error of a front value of feedback and expectation value;
Described method also comprises step:
If the error of current value of feedback and expectation value is greater than the error of a front value of feedback and expectation value, the error based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
4. the control method of 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 resistor unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistor 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 resistor unit and the total resistance of described expectation is greater than the total resistance of previous reality of variable resistor unit and the error of the total resistance of described expectation, the error based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
5. a regulating system of regulating digital regulation resistance based on ratio, it is applied to include the circuit of the variable resistor unit consisted of a plurality of digital regulation resistances, and a coherent signal of this circuit is relevant to the resistance of variable resistor unit, it is characterized in that, described regulating system of based on ratio, regulating digital regulation resistance at least comprises:
The exponent number determining unit, determine the total resistance of expectation of variable resistor unit for the expectation value of the coherent signal based on described circuit, and determine the exponent number of each digital regulation resistance based on the total resistance of described expectation;
Judging unit, after arranging for the exponent number when each digital regulation resistance, judge whether the predetermined constraints condition meets;
Adjustment unit, for when the predetermined constraints condition meets, the value of feedback of the coherent signal based on described circuit and expectation value are determined the resistance resize ratio, and the current exponent number based on described resize ratio and variable resistor unit is determined the adjustment amount of each digital regulation resistance exponent number;
Wherein, described predetermined constraints condition comprises a or b:
The value of feedback of a, described circuit coherent signal and the error of expectation value surpass the first preset range, and the number of times that arranges that each digital regulation resistance exponent number is set is less than pre-determined number;
The total resistance of reality of b, described variable resistor unit surpasses the second preset range with the error of the total resistance of expectation, and the number of times that arranges that each digital regulation resistance exponent number is set is less than pre-determined number.
6. regulating system of regulating digital regulation resistance based on ratio according to claim 5, it is characterized in that: when each digital regulation resistance in the variable resistor unit is connected, if the residual error of the resistance of the variable resistor unit calculated based on determined exponent number and the total resistance of described expectation surpasses minimum step half, exponent number determining unit or adjustment unit add 1 again by the exponent number of the corresponding digital regulation resistance of minimum step; If the step-length of the digital regulation resistance of minimum step is 2:5 with the step-length of another digital regulation resistance ratio, work as the resistance of the variable resistor unit calculated based on determined exponent number and the residual error of the total resistance of described expectation and surpass 3/4 of minimum step, exponent number determining unit or adjustment unit add 1 again by the exponent number of the corresponding digital regulation resistance of minimum step; If when the residual error of the resistance of the variable resistor unit that calculate based on determined exponent number and the total resistance of described expectation surpass minimum step 1/4 but over 3/4 of minimum step, exponent number determining unit or adjustment unit subtract the exponent number of the corresponding digital regulation resistance of minimum step 2 again, the exponent number of this another digital regulation resistance adds 1.
7. regulating system of 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 expectation value is greater than the error of a front value of feedback and expectation value;
Described adjustment unit also for:
If the error of current value of feedback and expectation value is greater than the error of a front value of feedback and expectation value, the error based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
8. regulating system of 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 resistor unit and the error of the total resistance of described expectation are greater than the total resistance of previous reality of variable resistor 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 resistor unit and the total resistance of described expectation is greater than the total resistance of previous reality of variable resistor unit and the error of the total resistance of described expectation, the error based on previous value of feedback and expectation value redefines the adjustment amount of each digital regulation resistance exponent number.
9. the DC power supply circuit of a wide output area, it is characterized in that: the DC power supply circuit of described wide output area at least comprises: direct current stabilizer;
The resistor network that comprises the variable resistor unit, be connected with described direct current stabilizer, and for regulating the output voltage of described direct current stabilizer, wherein, described variable resistor unit comprises a plurality of digital regulation resistances;
Controller, comprise the described regulating system of any one in claim 5 to 8, and it is connected to described direct current stabilizer output terminal, for the resistance that each digital regulation resistance is set and the output voltage that gathers described direct current stabilizer.
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| 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 |
| CN112600534A (en) * | 2021-01-04 | 2021-04-02 | 广州千寻信息技术有限公司 | Control method of adjustable resistor combined circuit |
| CN112600534B (en) * | 2021-01-04 | 2024-06-11 | 广州千语软件信息科技有限公司 | Control method of adjustable resistor combination circuit |
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| CN112600534B (en) * | 2021-01-04 | 2024-06-11 | 广州千语软件信息科技有限公司 | Control method of adjustable resistor combination circuit |
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