CN101980096A - Power supply compensation method and power supply compensation circuit - Google Patents
Power supply compensation method and power supply compensation circuit Download PDFInfo
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- CN101980096A CN101980096A CN201010512097.6A CN201010512097A CN101980096A CN 101980096 A CN101980096 A CN 101980096A CN 201010512097 A CN201010512097 A CN 201010512097A CN 101980096 A CN101980096 A CN 101980096A
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Abstract
The invention provides a power supply compensation method and a power supply compensation circuit. The method comprises the following steps of: sampling farthest end load voltage and nearest end load voltage respectively; superposing the farthest end load voltage and the nearest end load voltage by using an adding circuit to obtain superposed voltage; dividing the superposed voltage by using a voltage dividing circuit to obtain reference voltage; and inputting the reference voltage into the feedback end of a voltage source, so that the voltage source adjusts the voltage which is output to a load according to the reference voltage which is fed back, wherein the voltage source is a stabilized voltage source with feedback function; and the adjusting step ensures that the reference voltage is close to a fixed value. Variable voltage drop between a far end load and a power supply is uniformly distributed to near end load voltage and far end load voltage, and the working voltage deviation of all load chips under an adjusted voltage source is ensured to be in a fixed range, so that the defect of single end feedback in the conventional power supply compensation method is effectively overcome.
Description
Technical field
The present invention relates to the electronic communication field, relate in particular to a kind of power supply compensation method and power supply compensating circuit.
Background technology
Along with the development of the network communications technology, present wiring board area is increasing, and printed circuit board (PCB) (Printed Circuit Board is called for short PCB) cabling is also more and more thinner, and the line impedence of walking of Yin Ruing has become a factor of can not ignore thus.Secondly; in order to realize isolating and filtering, can be serially connected with magnetic bead or inductance usually at the voltage source signal end, self also has certain impedance magnetic bead and inductance; therefore, factors such as PCB cabling, inductance, magnetic bead cause producing between power output end and the load certain pressure drop loss.On the other hand, for load, usually supported chip all can be provided with upper voltage limit and lower voltage limit, if voltage has exceeded the working range of load, supported chip can't operate as normal, thereby, when causing the pressure drop loss excessive, the voltage that is difficult to the proof load chip is in the normal voltage range if the impedance between load and the voltage source is bigger.Therefore, how to adjust the magnitude of voltage of power output end, make that under different temperature, electric current, wiring environment the voltage on all supported chips below the same power output end all can not exceed its voltage power supply scope, has become the problem that must consider.
In the existing technical scheme, propose multiple compensation method at the adjustment and the feedback method of supply voltage, the most frequently used is divided into following two kinds: first kind of voltage compensating method commonly used is near-end Voltage Feedback method.Specifically refer to after the output terminal of voltage source is sampled to output voltage, give voltage source self, make the voltage source that has according to adjusting function output voltage to be adjusted to desirable value according to feedback voltage with the Voltage Feedback that samples.This method can guarantee can access stable normal working voltage in the load of near-end low pressure drop, but for the pressure drop that the far-end load brings owing to impedances such as PCB cabling and filter inductances, this method can't guarantee that but its magnitude of voltage that obtains is within the voltage range that requires.
Second kind of voltage compensating method commonly used is far-end Voltage Feedback method.In this method, after voltage being sampled in far-end load place of voltage source, give voltage source with the Voltage Feedback that samples, make the voltage source that has according to adjusting function to adjust output voltage, be in stable status with the operating voltage that guarantees the far-end load according to feedback voltage.Though this method can guarantee the far-end load and obtain required normal working voltage, but when the far-end load current is big, temperature is high and walk line impedence when big, in order to remedy its pressure drop, voltage source may be higher through adjusted output voltage, this voltage that just may cause the near-end load to obtain is higher than the upper limit of its operating voltage, thereby causes the operation irregularity of near-end load.
As seen, though the Voltage Feedback compensation method of prior art can compensate the pressure drop loss of a part of load, but the drawback that but has single-ended feedback, promptly exist near-end Voltage Feedback method can't compensate the pressure drop that the far-end load brings because of impedances such as PCB cabling and filter inductances, far-end Voltage Feedback method but might be higher than the problem of the upper limit of its operating voltage because of feeding back the excessive pressure drop that causes the near-end load to obtain of pressure drop, thereby the voltage that can't really satisfy all supported chips under the same voltage source all is in the interior requirement of its voltage power supply scope.
Summary of the invention
The invention provides a kind of power supply compensation method and power supply compensating circuit,, guarantee that all loads under the same power supply all can be operated in the normal voltage range in order to overcome the drawback of the single-ended feedback that existing supply voltage Compensation Feedback method has.
For achieving the above object, the invention provides a kind of power supply compensation method, comprising:
The distal-most end of sampling respectively load voltage and most proximal end load voltage;
Adopt adding circuit that described distal-most end load voltage and most proximal end load voltage are carried out overlap-add procedure, obtain superimposed voltage;
Adopt bleeder circuit that described superimposed voltage is carried out voltage division processing, obtain reference voltage;
Described reference voltage is inputed to the feedback end of voltage source, so that described voltage source is according to the described reference voltage of feedback, the voltage of load is exported in adjustment, and described voltage source is the source of stable pressure with feedback function, and described set-up procedure guarantees that described reference voltage is tending towards fixed value.
For achieving the above object, the present invention also provides a kind of power supply compensating circuit, comprising: voltage source and a plurality of loads that are connected with described voltage source, and wherein, this voltage source is the source of stable pressure with feedback function, this power supply compensating circuit also comprises:
Sample circuit, distal-most end load voltage and most proximal end load voltage are used for sampling respectively;
Adding circuit is connected with described sample circuit, is used for described distal-most end load voltage and most proximal end load voltage are carried out overlap-add procedure, obtains superimposed voltage;
Bleeder circuit, be connected with described voltage source with described adding circuit respectively, be used for described superimposed voltage is carried out voltage division processing, to obtain reference voltage, and described reference voltage is inputed to the feedback end of described voltage source, so that described voltage source according to the described reference voltage of feedback, is adjusted and exported to the voltage of load, described set-up procedure guarantees that described reference voltage is tending towards fixed value.
Power supply compensation method provided by the invention and power supply compensating circuit, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope, thereby effectively overcome the drawback of the single-ended feedback that occurs in the existing power supply compensation method in the operating voltage of all supported chips under the voltage source of adjusting.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of power supply compensation method embodiment one of the present invention;
Fig. 2 is the process flow diagram of power supply compensation method embodiment two of the present invention;
Fig. 3 is the structural representation of power supply compensating circuit embodiment one of the present invention;
Fig. 4 is the structural representation of power supply compensating circuit embodiment two of the present invention;
Fig. 5 is the circuit diagram of power supply compensating circuit embodiment three of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the process flow diagram of power supply compensation method embodiment one of the present invention, and as shown in Figure 1, present embodiment specifically comprises the steps:
Power supply compensation method of the present invention can be applied in the scene that is connected with a plurality of loads under the same voltage source.Particularly, the present invention is provided with the power supply compensating circuit between voltage source and load, and this power supply compensating circuit is arranged near voltage source one side, compensates in order to supply voltage is sent to the pressure drop loss that load end produces.For supply voltage is fed back to voltage source because of the pressure drop loss that reasons such as PCB cabling are sent to load end, at the voltage source end, in all loads that the power supply compensating circuit will be respectively powered to voltage source, the supply voltage of most proximal end load and the supply voltage of distal-most end load sample.In the present invention, claim that the most proximal end load voltage that samples is Vs, claim that the distal-most end load voltage that samples is Vt.
Sample after most proximal end load voltage and the distal-most end load voltage, the power supply compensating circuit carries out overlap-add procedure with most proximal end load voltage Vs and the distal-most end load voltage Vt that samples, to obtain superimposed voltage Vo.Further, after the power supply compensating circuit carries out voltage division processing with this superimposed voltage Vo, obtain the reference voltage Vref after the dividing potential drop, comprise most proximal end load voltage and the partial pressure value of distal-most end load voltage after voltage division processing in this reference voltage Vref, be equivalent to comprise the pressure drop loss of supply voltage in most proximal end load and distal-most end load.For the most proximal end load, it is arranged near the voltage source, thereby only relates to the pressure drop that is brought by the magnetic bead and the inductive impedance of voltage source signal, so the pressure drop loss is very little; But for the distal-most end load, because it is arranged on the voltage source far-end, thereby except the impedance voltage drop that magnetic bead and inductance brought of voltage source signal, also exist bigger PCB to walk line impedence, thereby the pressure drop loss is bigger, thereby what relate generally to reflection in the reference voltage Vref is the pressure drop loss of supply voltage at the distal-most end load end.
The reference voltage Vref that the power supply compensating circuit obtains voltage division processing inputs to the feedback end of voltage source U, so that this reference voltage Vref is fed back among the voltage source U, thereby is equivalent to the variable-pressure drop of supply voltage in the distal-most end load fed back to voltage source.Because in the present invention, this voltage source U is specially the source of stable pressure with feedback adjusting function, Chang Yong low pressure difference linear voltage regulator (low dropout regulator for example, be called for short LDO) or the DC-DC power module etc., this source of stable pressure can be according to the voltage of feedback voltage self-adjusting output, and can guarantee under the adjustment of output voltage, the voltage of feedback end, promptly reference voltage Vref finally trends towards a fixed value.Thereby pass through voltage source U according to the adjustment of reference voltage to the supply voltage of output, no matter the pressure drop loss in the distal-most end load becomes big or diminishes, because reference voltage Vref trends towards a fixed value the most at last, be that most proximal end load voltage Vs and distal-most end load voltage Vt sum finally trend towards a fixed value, thereby be equivalent to the variable-pressure drop loss in the distal-most end load has been evenly distributed on all the near-end load voltage and far-end load voltage, shared pressure drop loss in the distal-most end load by all load average ground.Pressure drop loss in the distal-most end load will be lowered, and the pressure drop loss in the most proximal end load will be raised, and thus, guarantee that more the supply voltage of distal-most end load and most proximal end load all can be tending towards normal stable.
Because voltage source is to the adjustment of output voltage, can make the operating voltage of distal-most end load remain within the normal scope, even be that adjusted supply voltage is when being sent to the distal-most end load after through bigger pressure drop loss, the operating voltage of distal-most end load also can not be lower than the lower voltage limit value of normal range of operation, thereby for other far-end load, its resulting supply voltage also can not be lower than the lower limit of normal working voltage equally; Further, for the near-end load, owing to also reflected the magnitude of voltage of most proximal end load in the reference voltage Vref, thereby voltage source U has equally also considered the most proximal end load based on reference voltage Vref to the adjustment of output voltage, be that adjusted supply voltage can guarantee that equally the work electricity of most proximal end load can not be higher than its normal range of operation upper voltage limit value, thereby for other near-end load, its resulting supply voltage also can not exceed the higher limit of its normal working voltage equally.Thus one, power supply compensation method of the present invention has guaranteed effectively that under the adjustment of voltage source the operating voltage of all supported chips all departs under fixing scope, can not exceed its voltage power supply scope.
The power supply compensation method of present embodiment, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope, thereby effectively overcome the drawback of the single-ended feedback that occurs in the existing power supply compensation method in the operating voltage of all supported chips under the voltage source of adjusting.
Fig. 2 is the process flow diagram of power supply compensation method embodiment two of the present invention, and as shown in Figure 2, present embodiment specifically comprises the steps:
How present embodiment has carried out concrete description to the method that the pressure drop loss of load compensates to the power supply compensating circuit.In the present embodiment, because the power supply compensating circuit is arranged near voltage source one side, thereby when the magnitude of voltage of sampling distal-most end load, because of the cause of long PCB cabling between distal-most end load and the voltage source, if right sampling process is carried out special processing, will cause when the magnitude of voltage of the distal-most end load that far-end samples is transferred into the voltage source end after the impedance loss of long PCB cabling, long PCB cabling makes the sample voltage value that arrives diminish, thereby causes can't sampling at the power supply compensating circuit magnitude of voltage of distal-most end load accurately.Thereby, in the present embodiment, special flow process has been adopted in the sampling of distal-most end load voltage in order to overcome this defective, specifically can comprise following substep:
Particularly, the power supply compensating circuit can at first directly be gathered the voltage signal of distal-most end load in the distal-most end load-side, and what collected this moment is the analog voltage signal of the reality of any pressure drop loss of not passing through of distal-most end load, be sent to the voltage source end without any pressure drop loss equally in order to be somebody's turn to do without the voltage signal of crossing the pressure drop loss, the power supply compensating circuit is after collecting this analog voltage signal, can adopt analog to digital converter (Analog to Digital Converter, be called for short ADC) this analog voltage signal is carried out the modulus signal conversion, thus obtain reflecting the digital voltage signal of the actual voltage value of distal-most end load.The power supply compensating circuit is sent to the voltage source end with the digital voltage signal after analog to digital conversion through the PCB cabling, because this moment, the magnitude of voltage of distal-most end load was to transmit on the PCB cabling with the form of digital signal, thereby this magnitude of voltage can not produce any pressure drop loss, can not diminish, thereby after the voltage source termination is received this digital voltage signal, adopt digital to analog converter (Digital to Analog Converter again, be called for short DAC) this digital signal is carried out the conversion of digital and analogue signals, convert thereof into the corresponding simulating signal, this simulating signal just is not pass through any pressure drop loss, the actual voltage value of distal-most end load is the distal-most end load voltage Vt described in the present invention.
As seen, in power supply compensating circuit of the present invention, by ADC being set at the distal-most end load end, actual voltage value to the distal-most end load that samples carries out analog to digital conversion, at the voltage source end DAC is set again, the digital voltage signal that receives is carried out digital-to-analog conversion, obtaining actual distal-most end load voltage, thus the unpredictable pressure drop loss of having avoided actual distal-most end load voltage signal under the PCB cabling of long distance, to produce effectively.
Sample after most proximal end load voltage Vs and the distal-most end load voltage Vt, the power supply compensating circuit adopts adding circuit that most proximal end load voltage Vs and the distal-most end load voltage Vt that samples carried out overlap-add procedure, to obtain the superimposed voltage Vo after the overlap-add procedure.And in the present embodiment, before most proximal end load voltage Vs and distal-most end load voltage Vt are carried out overlap-add procedure, it is that the amplifying circuit of K1 and K2 carries out processing and amplifying to distal-most end load voltage and most proximal end load voltage that the power supply compensating circuit can also adopt enlargement factor respectively, with most proximal end load voltage and the distal-most end load voltage that obtains processing and amplifying respectively.
Particularly, in the present embodiment, the reason that distal-most end load voltage and most proximal end load voltage are carried out processing and amplifying is respectively: because in actual applications, most proximal end load and distal-most end load may be different to the requirement that departs from scope of voltage bound, for example might the most proximal end load requirement of voltage deviation scope be higher than the distal-most end load, voltage deviation area requirement as the most proximal end load is 3.3V ± 3%, and the distal-most end load voltage departs from area requirement is 3.3V ± 5%, this moment is when being distributed to each load with the pressure drop loss in the distal-most end load, for the distal-most end load, then can share more pressure drop loss, thereby correspondingly, when most proximal end load voltage and distal-most end load voltage are carried out overlap-add procedure, then can be the bigger weight ratio of distal-most end load voltage setting; And on the contrary, if the most proximal end load is lower than the distal-most end load to the requirement of voltage deviation scope, for example the voltage deviation area requirement of most proximal end load is 3.3V ± 5%, and the distal-most end load voltage departs from area requirement is 3.3V ± 3%, then can be the bigger weight ratio of most proximal end load voltage setting this moment when most proximal end load voltage and distal-most end load voltage are carried out overlap-add procedure.
In the present embodiment, the step that should different weight ratio be set for most proximal end load voltage and distal-most end load voltage is by before carrying out overlap-add procedure to most proximal end load voltage and distal-most end load voltage, and adopting enlargement factor respectively is that the amplifying circuit of K1 and K2 carries out processing and amplifying to distal-most end load voltage and most proximal end load voltage and is achieved.The value of this enlargement factor K1 and K2 can be identical or different, specifically can be set to positive arbitrarily according to actual conditions.After respectively the most proximal end load voltage that samples and distal-most end load voltage being carried out processing and amplifying, the power supply compensating circuit adopts adding circuit, most proximal end load voltage and distal-most end load voltage after specifically referring to adopt a totalizer to processing and amplifying carry out overlap-add procedure, will obtain above-mentioned superimposed voltage Vo.
At this superimposed voltage Vo, the power supply compensating circuit can also further adopt bleeder circuit that this superimposed voltage Vo is carried out voltage division processing, to obtain the reference voltage Vref after the dividing potential drop, comprise most proximal end load voltage and the partial pressure value of distal-most end load voltage after voltage division processing in this reference voltage Vref, be equivalent to comprise the pressure drop loss of supply voltage in most proximal end load and distal-most end load.In the present embodiment, the bleeder circuit that is adopted is specifically as follows resistor voltage divider circuit, resistance series connection bleeder circuit and resistance bleeder circuit in parallel for example, by different resistances is set in this resistor voltage divider circuit, can obtain different dividing potential drop factor K, thereby this resistor voltage divider circuit can be adjusted by the dividing potential drop factor K to the numerical values recited of the reference voltage that feeds back to voltage source.Need to prove that except resistor voltage divider circuit, the bleeder circuit that is adopted in this step can also be the bleeder circuit of commonly used other in the prior art, and the present invention does not limit to this.
After voltage division processing obtains reference voltage Vref, the power supply compensating circuit inputs to this reference voltage Vref the feedback end of voltage source U, so that Vref is fed back among the voltage source U, thereby be equivalent to the voltage of most proximal end load and the voltage of distal-most end load have all been fed back to voltage source U.Voltage source U adjusts the output voltage of self according to this feedback voltage V ref, to export suitable magnitude of voltage.Particularly, this voltage source U is specially the source of stable pressure with feedback adjusting function, for example Chang Yong LDO voltage stabilizer or DC-DC power module etc., this source of stable pressure can be according to the voltage of feedback voltage self-adjusting output, and can guarantee under the adjustment of output voltage, the voltage of feedback end, promptly reference voltage Vref finally trends towards a fixed value, thus the supply voltage that voltage source is exported according to the feedback voltage adjustment can make the supply voltage of distal-most end load and most proximal end load all be tending towards normal stable.
Particularly, suppose in above-mentioned steps 204 that the reference voltage that obtains through resistance series connection bleeder circuit voltage division processing is
Wherein Vs is the most proximal end load voltage that samples, and Vt is the distal-most end load voltage that samples, and K is the dividing potential drop factor of resistance series connection bleeder circuit, and the K1 in the amplifying circuit and K2 are 1.Suppose that the pressure reduction between Vs and the Vt is Vf, i.e. V
f=V
s-V
t, then can obtain following formula:
Further, according to above-mentioned formula (1), can also obtain following two expression formulas of Vt, Vs:
Can get according to above-mentioned formula (2) and (3), K is the dividing potential drop factor of bleeder circuit, is a fixed value; And reference voltage Vref, for any a fixing source of stable pressure with feedback adjusting function, its feedback voltage V ref all can trend towards a fixed value.Therefore for all loads of voltage source, by above-mentioned formula (2), (3) as can be seen, the voltage deviation value of the load of voltage source can be controlled in
Scope within.If, make by in bleeder circuit, getting the value of suitable dividing potential drop factor K
Value remain on the normal operating voltage of supported chip, for example about 3.3V, under power supply compensation way of the present invention, when the pressure drop loss Vf of distal-most end load changes, voltage source U can adjust its output voltage automatically, thereby the deviation value that guarantees the operating voltage of all loads under this voltage source all exists
Within the scope.
The power supply compensation method of present embodiment, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope, thereby effectively overcome the drawback of the single-ended feedback that occurs in the existing power supply compensation method in the operating voltage of all supported chips under the voltage source of adjusting.
Further, in the present embodiment, also by ADC being set at the distal-most end load end, actual voltage value to the distal-most end load that samples carries out analog to digital conversion, at the voltage source end DAC is set again, the digital voltage signal that receives is carried out digital-to-analog conversion, obtaining actual volume distal-most end load voltage, thus the unpredictable pressure drop loss of having avoided actual distal-most end load voltage signal under the PCB cabling of long distance, to produce effectively.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 3 is the structural representation of power supply compensating circuit embodiment one of the present invention.As shown in Figure 3, the power supply compensating circuit of present embodiment comprises: voltage source 1 and a plurality of loads that are connected with voltage source 1 (most proximal end load 21 and distal-most end load 22 only are shown among the figure), wherein, the source of stable pressure of this voltage source 1 for having the feedback adjusting function, can guarantee that the voltage of its feedback end trends towards a fixed value by adjusting function, for example Chang Yong LDO voltage stabilizer or DC-DC power module etc.In the present embodiment simultaneously, the power supply compensating circuit specifically can also comprise: sample circuit 3, adding circuit 4 and bleeder circuit 5.
Wherein, sample circuit 3 respectively with above-mentioned a plurality of loads in most proximal end load 21 be connected with distal-most end load 22, the most proximal end load voltage Vs of most proximal end load 21 and the distal-most end load voltage Vt of distal-most end load 22 are used for sampling respectively; Adding circuit 4 is connected with sample circuit 3, and the most proximal end load voltage Vs and the distal-most end load voltage Vt that are used for sample circuit 3 is sampled carry out overlap-add procedure, to obtain superimposed voltage Vo; And bleeder circuit 5 is connected with voltage source 1 with adding circuit 4 respectively, the superimposed voltage Vo that is used for adding circuit 4 is obtained carries out voltage division processing, to obtain reference voltage Vref, and this reference voltage Vref is inputed to the feedback end of voltage source 1, thereby make the reference voltage Vref of voltage source 1 according to feedback, the voltage of load is exported in adjustment, and this set-up procedure can guarantee that reference voltage Vref finally trends towards a fixed value.
Particularly, the concrete course of work that all circuit in the power supply compensating circuit of present embodiment are related can not repeat them here with reference to the related content of the related related embodiment exposure of above-mentioned power supply compensation method.
The power supply compensating circuit of present embodiment, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope, thereby effectively overcome the drawback of the single-ended feedback that occurs in the existing power supply compensation method in the operating voltage of all supported chips under the voltage source of adjusting.
Fig. 4 is the structural representation of power supply compensating circuit embodiment two of the present invention.As shown in Figure 4, on the basis of a last embodiment, in the power supply compensating circuit of present embodiment, sample circuit 3 specifically can comprise most proximal end load sampling electronic circuit 31, distal-most end load sampling electronic circuit 32, analog to digital converter 33 and digital to analog converter 34.Wherein, most proximal end load sampling electronic circuit 31 is connected with most proximal end load 21, the above-mentioned most proximal end load voltage Vs that is used to sample, and the Vs that samples exported to adding circuit 4; Distal-most end load sampling electronic circuit 32 is connected with distal-most end load 22, is used at the distal-most end load end analog voltage signal of distal-most end load 22 being sampled; Analog to digital converter 33 and distal-most end load sampling electronic circuit 32 is connected, and the analog voltage signal that is used for the distal-most end load that will sample converts digital voltage signal to, and is sent to the voltage source end; Digital to analog converter 34 then is used at the voltage source end digital voltage signal that receives being carried out the digital and analogue signals conversion, thereby obtains actual distal-most end load voltage Vt, and this distal-most end load voltage Vt is exported to adding circuit 4.
Further, in the power supply compensating circuit of present embodiment, can also comprise amplifying circuit 6, this amplifying circuit is used for adopting the enlargement factor of K1 and K2 that most proximal end load voltage Vs and distal-most end load voltage Vt are carried out processing and amplifying respectively before 4 pairs of most proximal end load voltages of adding circuit and distal-most end load voltage carry out overlap-add procedure; And correspondingly, in the present embodiment, above-mentioned adding circuit 4 specifically is used for distal-most end load voltage after amplifying circuit 6 processing and amplifying and most proximal end load voltage are carried out overlap-add procedure, obtains above-mentioned superimposed voltage Vo.
Further, in the power supply compensating circuit of present embodiment, above-mentioned bleeder circuit 5 is specifically as follows resistor voltage divider circuit, resistance series connection bleeder circuit or resistance bleeder circuit in parallel for example, perhaps other forms of bleeder circuit, the present invention does not limit this, as long as this bleeder circuit can carry out voltage division processing to the superimposed voltage after overlap-add procedure.Voltage source 1 is specifically as follows LDO voltage stabilizer or DC-DC power module, perhaps other forms of source of stable pressure with feedback adjusting function, and the present invention does not limit this equally.Adding circuit 4 then is specifically as follows totalizer commonly used, and the implementation of this totalizer can be with reference to the various implementations of existing totalizer.
Particularly, the concrete course of work that all circuit in the power supply compensating circuit of present embodiment are related can not repeat them here with reference to the related content of the related related embodiment exposure of above-mentioned power supply compensation method equally.
The power supply compensating circuit of present embodiment, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope, thereby effectively overcome the drawback of the single-ended feedback that occurs in the existing power supply compensation method in the operating voltage of all supported chips under the voltage source of adjusting.
Further, in the present embodiment, also by ADC being set at the distal-most end load end, actual voltage value to the distal-most end load that samples carries out analog to digital conversion, at the voltage source end DAC is set again, the digital voltage signal that receives is carried out digital-to-analog conversion, obtaining actual distal-most end load voltage, thus the unpredictable pressure drop loss of having avoided actual distal-most end load voltage signal under the PCB cabling of long distance, to produce effectively.
Fig. 5 is the circuit diagram of power supply compensating circuit embodiment three of the present invention.As shown in Figure 5, the power supply compensating circuit of present embodiment comprises: voltage source U and a plurality of load (most proximal end load IC1 and distal-most end load IC2 only are shown among the figure).Wherein, this voltage source U is specially the source of stable pressure with feedback adjusting function, this source of stable pressure can guarantee that the voltage of its feedback end trends towards a fixed value by adjusting function, and for example this source of stable pressure is specifically as follows LDO voltage stabilizer commonly used or DC-DC power module etc.
Further, in the present embodiment, the power supply compensating circuit specifically can also comprise: adding circuit (being specifically as follows totalizer AD shown in Figure 5) and bleeder circuit.This bleeder circuit is specifically as follows resistance series connection bleeder circuit, and as shown in Figure 5, this resistance series connection bleeder circuit can be made of resistance R 1 and resistance R 2, and in this resistance series connection bleeder circuit, the dividing potential drop factor
By adjusting the resistance size of R1 and R2, can adjust the size of dividing potential drop factor K.After totalizer AD carries out addition with the most proximal end load voltage Vs that samples respectively and distal-most end load voltage Vt and obtains total voltage Vo, this total voltage Vo will obtain reference voltage Vref through the voltage division processing of bleeder circuit,
The reference voltage Vref that bleeder circuit obtains voltage division processing exports the feedback end of voltage source U to, so that voltage source U according to the reference voltage of feedback, adjusts and exports to the voltage of load.Because in the present embodiment, voltage source U is the source of stable pressure with feedback adjusting function, thereby this set-up procedure can guarantee under the adjustment of output voltage, the input voltage of feedback end, be that reference voltage Vref finally trends towards a fixed value, thereby the supply voltage that voltage source is exported according to the feedback voltage adjustment can make the supply voltage of distal-most end load and most proximal end load all be tending towards normal stable.
Further, in the power supply compensating circuit of present embodiment, can also comprise amplifying circuit (being specifically as follows the described amplifier of Fig. 5), this amplifier was used for before totalizer AD carries out overlap-add procedure to most proximal end load voltage and distal-most end load voltage, adopt the enlargement factor of K1 and K2 that most proximal end load voltage Vs and distal-most end load voltage Vt are carried out processing and amplifying respectively, on this basis, totalizer AD carries out overlap-add procedure to most proximal end load voltage after the processing and amplifying and distal-most end load voltage again, to obtain superimposed voltage Vo.Still be that K is an example with the dividing potential drop factor in the bleeder circuit, after processing and amplifying, bleeder circuit carries out the reference voltage that obtains after the voltage division processing at most proximal end load voltage and distal-most end load voltage
Further, in the power supply compensating circuit of present embodiment, can also comprise analog to digital converter ADC and digital to analog converter DAC.Particularly, ADC is arranged on the distal-most end load end, directly is connected with distal-most end load IC2, is used for converting the analog voltage signal of distal-most end load IC2 of sampling to digital voltage signal at the distal-most end load end, and is sent to the voltage source end; And DAC is arranged on the voltage source end, AD directly is connected with totalizer, be used for receiving the digital voltage signal that ADC transmits in the voltage source termination, and the digital voltage signal that receives carried out digital and analogue signals conversion, obtain after the distal-most end load voltage Vt, Vt exports to totalizer AD with this distal-most end load voltage.
In the power supply compensating circuit of present embodiment, by ADC being set at the distal-most end load end, actual voltage value to the distal-most end load that samples carries out analog to digital conversion, because this moment, the magnitude of voltage of distal-most end load was to transmit on the PCB cabling with the form of digital signal, thereby this magnitude of voltage can not produce any pressure drop loss, thereby when DAC being set at the voltage source end, after the digital voltage signal that receives carried out digital-to-analog conversion, the simulating signal that obtains is not pass through any pressure drop loss, the actual voltage value of distal-most end load, thereby the unpredictable pressure drop loss of having avoided actual distal-most end load voltage signal under the PCB cabling of long distance, to produce effectively.
The power supply compensating circuit of present embodiment, by distal-most end load voltage and the most proximal end load voltage of sampling simultaneously, and after the distal-most end load voltage that samples and most proximal end load voltage sum carried out voltage division processing, branch pressure voltage after the dividing potential drop is fed back to voltage source, make and have of the variation of the voltage source of automatic regulatory function according to feedback voltage, can adjust the output voltage values of self automatically, because in the present invention, under the adjustment of voltage source output voltage, can guarantee that distal-most end load voltage and the branch pressure voltage of most proximal end load voltage sum after voltage division processing finally trend towards keeping a fixed value, thereby be equivalent to the variable-pressure drop between far-end load and the power supply is evenly distributed on near-end load voltage and the far-end load voltage, guarantee to depart under fixing scope in the operating voltage of all supported chips under the voltage source of adjusting, thus effectively customer service the drawback of the single-ended feedback that occurs in the existing power supply compensation method.
Further, in the present embodiment, also by ADC being set at the distal-most end load end, actual voltage value to the distal-most end load that samples carries out analog to digital conversion, at the voltage source end DAC is set again, the digital voltage signal that receives is carried out digital-to-analog conversion, obtaining actual distal-most end load voltage, thus the unpredictable pressure drop loss of having avoided actual distal-most end load voltage signal under the PCB cabling of long distance, to produce effectively.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a power supply compensation method is characterized in that, comprising:
The distal-most end of sampling respectively load voltage and most proximal end load voltage;
Adopt adding circuit that described distal-most end load voltage and most proximal end load voltage are carried out overlap-add procedure, obtain superimposed voltage;
Adopt bleeder circuit that described superimposed voltage is carried out voltage division processing, obtain reference voltage;
Described reference voltage is inputed to the feedback end of voltage source, so that described voltage source is according to the described reference voltage of feedback, the voltage of load is exported in adjustment, and described voltage source is the source of stable pressure with feedback function, and described set-up procedure guarantees that described reference voltage is tending towards fixed value.
2. power supply compensation method according to claim 1 is characterized in that, the described distal-most end load voltage of sampling specifically comprises:
Convert the analog voltage signal of distal-most end load of sampling to digital voltage signal at the distal-most end load end, and be sent to the voltage source end;
The described digital voltage signal that will receive at described voltage source end carries out the digital and analogue signals conversion, to obtain described distal-most end load voltage.
3. power supply compensation method according to claim 1 and 2 is characterized in that:
Described employing adding circuit carries out before the overlap-add procedure described distal-most end load voltage and most proximal end load voltage, and described method also comprises:
Adopting enlargement factor respectively is that the amplifying circuit of K1 and K2 carries out processing and amplifying to described distal-most end load voltage and most proximal end load voltage, and described K1 and K2 are positive number;
Described employing adding circuit carries out overlap-add procedure to described distal-most end load voltage and most proximal end load voltage and specifically comprises:
Adopt described adding circuit that distal-most end load voltage after processing and amplifying and most proximal end load voltage are carried out overlap-add procedure, obtain described superimposed voltage.
4. power supply compensation method according to claim 1 and 2 is characterized in that, described employing bleeder circuit carries out voltage division processing to described superimposed voltage and specifically comprises:
Adopt resistor voltage divider circuit that described superimposed voltage is carried out voltage division processing.
5. power supply compensation method according to claim 1 and 2 is characterized in that, described voltage source is specially low pressure difference linear voltage regulator or DC-DC power module.
6. a power supply compensating circuit comprises voltage source and a plurality of loads that are connected with described voltage source, it is characterized in that described voltage source is the source of stable pressure with feedback function, and described power supply compensating circuit also comprises:
Sample circuit, distal-most end load voltage and most proximal end load voltage are used for sampling respectively;
Adding circuit is connected with described sample circuit, is used for described distal-most end load voltage and most proximal end load voltage are carried out overlap-add procedure, obtains superimposed voltage;
Bleeder circuit, be connected with described voltage source with described adding circuit respectively, be used for described superimposed voltage is carried out voltage division processing, obtain reference voltage, and described reference voltage is inputed to the feedback end of described voltage source, so that described voltage source according to the described reference voltage of feedback, is adjusted and exported to the voltage of load, described set-up procedure guarantees that described reference voltage is tending towards fixed value.
7. power supply compensating circuit according to claim 6 is characterized in that, described sample circuit specifically comprises:
Most proximal end load sampling electronic circuit is connected with described most proximal end load, the described most proximal end load voltage that is used to sample, and the described most proximal end load voltage that will sample is exported to described adding circuit;
Distal-most end load sampling electronic circuit is connected with described distal-most end load, is used at the distal-most end load end analog voltage signal of described distal-most end load being sampled;
Analog to digital converter is connected with described distal-most end load sampling electronic circuit, and the analog voltage signal that is used for the described distal-most end load that will sample converts digital voltage signal to, and is sent to the voltage source end;
Digital to analog converter is used for carrying out digital and analogue signals conversion at the described digital voltage signal that described voltage source end will receive, and obtaining described distal-most end load voltage, and described distal-most end load voltage is exported to described adding circuit.
8. according to claim 6 or 7 described power supply compensating circuits, it is characterized in that:
Described power supply compensating circuit also comprises amplifying circuit, be used for before described adding circuit carries out overlap-add procedure to described distal-most end load voltage and most proximal end load voltage, adopting the enlargement factor of K1 and K2 that described distal-most end load voltage and most proximal end load voltage are carried out processing and amplifying respectively;
Described adding circuit specifically is used for distal-most end load voltage after described amplifying circuit processing and amplifying and most proximal end load voltage are carried out overlap-add procedure, obtains described superimposed voltage.
9. according to claim 6 or 7 described power supply compensating circuits, it is characterized in that described bleeder circuit is specially resistor voltage divider circuit.
10. according to claim 6 or 7 described power supply compensating circuits, it is characterized in that described voltage source is specially low pressure difference linear voltage regulator or DC-DC power module.
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| CN201010512097A CN101980096B (en) | 2010-10-13 | 2010-10-13 | Power supply compensation method and power supply compensation circuit |
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| CN201010512097A CN101980096B (en) | 2010-10-13 | 2010-10-13 | Power supply compensation method and power supply compensation circuit |
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| CN102222974A (en) * | 2011-06-15 | 2011-10-19 | 北京机械设备研究所 | Far-end and local sampling control circuit for power supply |
| CN105468069A (en) * | 2014-08-21 | 2016-04-06 | 上海兆芯集成电路有限公司 | Automatic potential drop compensation system, potential controller and circuit automatic configuration and wiring method |
| CN105576959A (en) * | 2016-02-25 | 2016-05-11 | 上海斐讯数据通信技术有限公司 | Dynamic voltage automatic adjustment circuit and method |
| CN107402595A (en) * | 2016-05-19 | 2017-11-28 | 恩智浦美国有限公司 | Compensation circuit |
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| CN102222974A (en) * | 2011-06-15 | 2011-10-19 | 北京机械设备研究所 | Far-end and local sampling control circuit for power supply |
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| CN108510943A (en) * | 2018-03-30 | 2018-09-07 | 成都奕斯伟芯片设计有限公司 | The voltage compensating circuit and display of display panel |
| WO2020015261A1 (en) * | 2018-07-17 | 2020-01-23 | 深圳市华星光电半导体显示技术有限公司 | Feedback method for dc-dc conversion circuit, and feedback circuit |
| CN109004822A (en) * | 2018-07-17 | 2018-12-14 | 深圳市华星光电半导体显示技术有限公司 | The feedback method and feed circuit of DC-DC conversion circuit |
| CN111632271A (en) * | 2019-03-01 | 2020-09-08 | 上海库石医疗技术有限公司 | Human body electrotherapy circuit |
| CN110244111A (en) * | 2019-07-19 | 2019-09-17 | 广东浪潮大数据研究有限公司 | A kind of plate end power supply proximally and distally device for detecting voltage |
| CN110244111B (en) * | 2019-07-19 | 2021-06-29 | 广东浪潮大数据研究有限公司 | Plate-end power supply near-end and far-end voltage detection device |
| CN112398338A (en) * | 2020-09-23 | 2021-02-23 | 深圳市航天新源科技有限公司 | Remote power supply voltage compensation system and method |
| CN112398338B (en) * | 2020-09-23 | 2022-05-20 | 深圳市航天新源科技有限公司 | Remote power supply voltage compensation method |
| CN112269139A (en) * | 2020-10-14 | 2021-01-26 | 无锡友达电子有限公司 | Multi-path LED lamp fault detection device |
| CN112803806A (en) * | 2021-03-18 | 2021-05-14 | 漳州科华技术有限责任公司 | Output voltage compensation method and voltage compensation device of inverter |
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