CN104407659B - The output current sample circuit of supply convertor and output voltage compensating circuit - Google Patents
The output current sample circuit of supply convertor and output voltage compensating circuit Download PDFInfo
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- CN104407659B CN104407659B CN201410557592.7A CN201410557592A CN104407659B CN 104407659 B CN104407659 B CN 104407659B CN 201410557592 A CN201410557592 A CN 201410557592A CN 104407659 B CN104407659 B CN 104407659B
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Abstract
The invention discloses a kind of output current sample circuit and output voltage compensating circuit of supply convertor, to the current sample of supply convertor master power switch pipe, under continuous conduction mode, the current value in master power switch pipe ON time half moment equals the value of output current, owing to there is Sleep under underloading? the situations such as Mode, inductive current is during this period of time zero, the mean value (electric current in main switch ON time half moment) of inductive current is not equal to output current, therefore need on average to arrive whole switch periods to obtain actual output current value to the current value in master power switch pipe ON time half moment, based on the above-mentioned sampling to output current, by sampling, the output current obtained flows through equivalent resistance to produce compensating signal, thus compensates reference voltage, the present invention passes through the voltage at sampling master power switch pipe two ends to obtain characterizing the signal of output current, without the need to being carried out the sampling of output current by sampling resistor, decreases power consumption, and can utilize the compensation of output current realization to output voltage of sampling and obtaining.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of output current sample circuit and output voltage compensating circuit of supply convertor.
Background technology
Supply convertor is widely used in electronic product, realizes voltage-regulation and power transfer.Control for supply convertor be unable to do without this important parameter of output current, is realized the regulation and control of supply convertor by sampled output current, such as, by sampled output current, carries out the compensation of output voltage.
In prior art, the sampling for output current is mainly sampled by sampling resistor at the output terminal of supply convertor, but in the structure of this sample circuit, the conducting of sampling resistor can cause larger electric energy loss.In addition, the output terminal due to supply convertor deposits impedance on the output line, and electric current flows through impedance on output line and produces step-down, thus causes actual output voltage on the low side.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of output current sample circuit and output voltage compensating circuit of supply convertor, to solve the problem that the sample power consumption existed in prior art is large, cannot compensate output voltage.
Technical solution of the present invention is, provides a kind of output current sample circuit of supply convertor of following structure, comprising:
Mu balanced circuit, in each switch periods, when the moment of supply convertor master power switch pipe conducting, described mu balanced circuit receives the sampled voltage signal characterizing and flow through supply convertor master power switch tube current; When reaching the moment of master power switch pipe ON time half, described mu balanced circuit suspends reception sampled voltage signal; Described mu balanced circuit exports the first voltage signal;
Filtering circuit, receives the first voltage signal that mu balanced circuit exports, and during mu balanced circuit receives sampled voltage signal, described filtering circuit suspends reception first voltage signal; Described filtering circuit exports the second voltage signal characterizing master power switch pipe ON time half moment current value.
Preferably, carry out process obtain the first current source to the second voltage signal, the current value of described first current source equals master power switch pipe ON time half moment current value; Described output current sample circuit also comprises output current and produces circuit, described output current produces the first switch and the first resistance that circuit comprises series connection mutually, in each switch periods, the first described switch conducting when the conducting of master power switch pipe, ends at the end of inductive current afterflow; Described output current produces circuit and receives described first current source, and produces voltage drop on the first resistance, and carries out equalization process to obtain characterizing the tertiary voltage signal of output current to described voltage drop.
Preferably, described mu balanced circuit comprises second switch and voltage stabilizing element; Described filtering circuit comprises the 3rd switch and filtration module; The control end of described second switch and the 3rd switch accesses corresponding control signal respectively, second switch receives time of the first voltage signal at the control of corresponding control signal mu balanced circuit of making decision, and the 3rd switch receives time of the second voltage signal at the control of corresponding control signal filtering circuit of making decision.
Preferably, described supply convertor based on the control model of fixing ON time, by relatively producing ON time to the first reference voltage and ramp signal; Compare described ramp signal and the second reference signal to produce the corresponding control signal controlling second switch and the 3rd switch on and off respectively, the control signal sequential logic of second switch and the 3rd switch is contrary.
Preferably, described voltage stabilizing element is electric capacity, and described filtration module is RC filtering circuit.
Another technical solution of the present invention is, a kind of output voltage compensating circuit of supply convertor is provided, comprise any one output current sample circuit above-mentioned, described supply convertor obtains by bleeder circuit sampling and outputting voltage the voltage division signal characterizing output voltage, voltage division signal and reference voltage are compared the conducting realizing master power switch pipe, described output voltage compensation on reference voltage, applies compensating signal flow through to compensate output current the pressure drop that outlet line impedance produces, pressure drop in described compensating signal and outlet line impedance is proportionate relationship.
Preferably, described compensating signal produces circuit by compensating signal and produces, described compensating signal produces circuit and comprises the second current source that equivalent resistance and current value equal output current, and described second current source flows through the pressure drop that equivalent resistance produces and is compensating signal.
Preferably, described equivalent resistance and outlet line impedance are proportionate relationship.
Preferably, the second described current source is produced after treatment by the tertiary voltage characterizing output current.
Adopt structure of the present invention and method, compared with prior art, have the following advantages: the present invention is to the current sample of supply convertor master power switch pipe, under continuous conduction mode, the current value in master power switch pipe ON time half moment equals the value of output current, owing to there is the situations such as SleepMode under underloading, inductive current is during this period of time zero, the mean value (electric current in main switch ON time half moment) of inductive current is not equal to output current, therefore need on average to arrive whole switch periods to obtain actual output current value to the current value in master power switch pipe ON time half moment, based on the above-mentioned sampling to output current, by sampling, the output current obtained flows through equivalent resistance to produce compensating signal, thus compensates reference voltage, the present invention passes through the voltage at sampling master power switch pipe two ends to obtain characterizing the signal of output current, without the need to being carried out the sampling of output current by sampling resistor, decreases power consumption, and can utilize the compensation of output current realization to output voltage of sampling and obtaining.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention for the output current sample circuit of supply convertor;
Fig. 2 is working waveform figure of the present invention.
Fig. 3 is the structural representation that output current produces circuit.
Fig. 4 is the working waveform figure that output current produces circuit.
Fig. 5 is the schematic diagram compensated reference voltage.
Embodiment
Below in conjunction with schematic diagram to the output current sample circuit of supply convertor of the present invention and output voltage compensating circuit for a more detailed description, which show the preferred embodiments of the present invention, should be appreciated that those skilled in the art can describe on basis at this, within the scope of the claims physical circuit of the present invention is converted and replaced, and still realize advantageous effects of the present invention.Following description is not as limitation of the present invention.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.It should be noted that, accompanying drawing all adopts the form that comparatively simplifies and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Core of the present invention is, provides a kind of output current sample circuit of supply convertor, comprising:
Mu balanced circuit, in each switch periods, when the moment of supply convertor master power switch pipe conducting, described mu balanced circuit receives the sampled voltage signal characterizing and flow through supply convertor master power switch tube current; When reaching the moment of master power switch pipe ON time half, described mu balanced circuit suspends reception sampled voltage signal; Described mu balanced circuit exports the first voltage signal;
Filtering circuit, receives the first voltage signal that mu balanced circuit exports, and during mu balanced circuit receives sampled voltage signal, described filtering circuit suspends reception first voltage signal; Described filtering circuit exports the second voltage signal characterizing master power switch pipe ON time half moment current value.
Further, the present invention also provides a kind of output voltage compensating circuit of supply convertor, and based on described output current sample circuit, described supply convertor passes through bleeder circuit (by resistance R
fbHwith resistance R
fbLbeing composed in series) sampling and outputting voltage obtains characterizing the voltage division signal of output voltage, voltage division signal and reference voltage are compared the conducting realizing master power switch pipe, described output voltage compensation on reference voltage, applies compensating signal flow through to compensate output current the pressure drop that outlet line impedance produces, and the pressure drop in described compensating signal and outlet line impedance is proportionate relationship.
Shown in figure 1, illustrate the output current sample circuit for supply convertor, and for buck convertor, but be not limited to this topological structure.Input voltage vin becomes output voltage Vout through voltage transitions, by output voltage feedback circuit by bleeder circuit sampling and outputting voltage, obtain the voltage division signal characterizing output voltage, described voltage division signal and reference voltage V ref3 compare to be made master power switch pipe Q1 conducting by PWM controller, and Q2 is synchronous rectifier.
Described buck converter is based on the control model of fixing ON time, described fixing ON time is produced by turn-on time generation circuit, ramp signal Slope and the first reference voltage Vref 1 compare to produce ON time by described turn-on time generation circuit, described ramp signal Slope is produced by ramp generator, and ramp generator comprises electric capacity C1, current source I
1with switch Q3, realize current source I by the break-make of control Q3
1to the charging of electric capacity C1, to produce ramp signal Slope.
Sample streams, through the electric current (voltage by master power switch pipe Q1 two ends of sampling realizes) of master power switch pipe Q1, obtains characterizing the sampled voltage signal Vsen1 (Vsen1=KI flowing through master power switch pipe Q1 electric current
q1) [now flow through the electric current I of master power switch pipe Q1
q1equal inductive current I
l].Mu balanced circuit comprises switch Q4 and electric capacity C2, mu balanced circuit receives sampled voltage signal Vsen1, in each switch periods, in the moment of master power switch pipe Q1 conducting, described mu balanced circuit receives the sampled voltage signal characterizing and flow through supply convertor master power switch tube current; When reaching the moment of master power switch pipe ON time half, described mu balanced circuit suspends reception sampled voltage signal, is controlled by switch Q4 (the first switch).During mu balanced circuit suspends reception sampled voltage signal, switch Q4 disconnects, and now electric capacity C2 plays the effect of voltage stabilizing, to prevent voltage jump.Sampled voltage signal Vsen1 exports the first voltage signal V after mu balanced circuit voltage stabilizing process
c2to filtering circuit.Described filtering circuit comprises switch Q5 (second switch) and filtration module, and described filtration module is the RC filtering circuit be made up of resistance R3 and electric capacity C3.Filtering circuit receives the first voltage signal V
c2the second voltage signal Vsen2 is obtained after filtering process, the second described voltage signal Vsen2 characterizes master power switch pipe ON time half moment current value, and during mu balanced circuit receives sampled voltage signal, described filtering circuit suspends reception first voltage signal.Under continuous conduction mode under (CCM), because the electric current flowing through Q1 equals corresponding inductive current I
l, inductive current I
lmean value equal output current I
ovalue.So when reaching master power switch pipe ON time half moment (Ton/2), instantaneous inductor electric current now equals inductive current I
lmean value, so time flow through Q1 momentary current equal output current I
o, thus achieve the sampling of output current.
The control termination control signal S2 of the control termination control signal S1 of described switch Q4, described switch Q5, the sequential logic of S1 and S2 is contrary.Take out the second reference voltage Vref 2 to compare with ramp signal Slope, thus produce control signal S1 and S2.The second described reference voltage Vref 2 equals 1/2nd of the first reference voltage Vref 1, and the object of this value is the moment of " location " master power switch pipe Q1 ON time half.
Shown in figure 2, the working waveform figure illustrated based on Fig. 1 embodiment (though the present embodiment only flows through the electric current of Q1, gives the complete waveform I of inductive current in figure
l).In master power switch pipe Q1 conduction period, flow through the electric current I on it
lalso increase thereupon (characterize electric current I
lsampled voltage signal Vsen1 in Q1 conduction period also with electric current I
lincrease), and reach maximal value in ON time finish time, after Q1 cut-off, I
ldecline.The switching sequence of switch Q3 is contrary with Q1, and to realize the generation of ramp signal Slope, ramp signal Slope compares to the second reference voltage and produces corresponding S1 and S2, with gauge tap Q4 and Q5.
When Q4 initial turn-on, electric capacity C2 receives sampled voltage signal Vsen1, the voltage on electric capacity C2 can be dragged down, but along with the increase of inductive current, the sampled voltage signal Vsen1 characterizing current value also increases thereupon, and the voltage on C2 is just corresponding increase also.Reach the Q1 ON time half moment, Q4 disconnects, then electric capacity C2 plays the effect of voltage stabilizing, voltage jump can not occur, constant with ME for maintenance.
In Q4 conduction period, Q5 is in off-state, and after Q4 disconnects, then Q5 starts conducting, and filtration module only receives the first voltage signal V after electric capacity C2 voltage stabilizing
c2.Due to Q5 off period, V
c2to suddenly change under sampled voltage signal Vsen1 effect and the part risen can not filtered module receive, therefore the V that receives of filtration module
c2be interrupted, after the filtering of RC filtering circuit, produce continuous print, the second stable voltage signal Vsen2.
Shown in figure 3, illustrate output current and produce circuit.In Fig. 1 embodiment, under the pattern of CCM, namely the second voltage signal Vsen2 characterizes output current Io, but, under DCM or light-load mode (SleepMode), in a switch periods, there is a period of time electric current I
lbe the situation of zero, now only use Fig. 1 embodiment, output current Io cannot be drawn, average value processing need be carried out to output current.
Average output current during second voltage signal Vsen2 characterizes continuous current mode.The effect that output current produces circuit is averaging processing in whole switch periods by above-mentioned electric current.According to Vsen2 and its scale-up factor characterized between electric current sampling resistor is set, and carry out current sample, thus obtain the first current source I
2, the first current source I
2value equal the current value in the moment of master power switch pipe ON time half, if Vsen2 and its scale-up factor characterized between electric current be K, the resistance R that resistance is K is set
kas sampling resistor, I can be obtained through current sample
2=Vsen2/K.
Current source I
2flow through resistance R4, resistance R4 produces pressure drop, with the ratio in whole cycle during the dutycycle of switch Q6 is continuous current mode, by after R5 and C4 filtering process, obtain tertiary voltage signal Vsen3, tertiary voltage signal Vsen3=I
2r4D
q6=IoR4, Io are actual average output current value, and therefore tertiary voltage signal Vsen3 characterizes actual output current.Circuit structure in figure is applicable to the situation of CCM equally, and when the situation of CCM, the dutycycle of Q6 is 1.
Shown in figure 4, illustrate the waveform that output current produces the control signal Standby of the Q6 of circuit.Q6 is at T
on_standbyperiod conducting, whole switch periods is T
s_standby.Shown in this accompanying drawing, mainly based on the circuit structure in Fig. 3, illustrate control signal Standby and electric current I
lcorresponding relation.
Shown in figure 5, illustrate the compensation of reference voltage, be about to transfer the compensation to reference voltage to the compensation of impedance on output line.Former reference voltage is Vref3 ', by R6 and the second current source I
3be that Vref3 ' carries out voltage compensation to former reference voltage, thus the reference voltage V ref3 after being compensated.Second current source I
3equal actual output current Io, obtained by tertiary voltage signal Vsen3 conversion processing, the method for its conversion processing can refer to Vsen2 and changes into the second current source I
2circuit structure, namely arrange sample circuit, and obtain corresponding current source by the mode of sample rate current, the resistance of sampling resistor equals R4.
Output loop is analyzed, known:
Vref3·(R
fbL+R
fbH)/R
fbL＝Io·R
Load+Io·(R1+R2)，Vref3＝Vref3’+Io·R6；
Obtain: (Vref3 '+IoR6) (R
fbL+ R
fbH)/R
fbL=IoR
load+ Io (R1+R2);
R1+R2 is the impedance on output line, R
loadfor pull-up resistor.
Due to: Vref3 ' (R
fbL+ R
fbH)/R
fbL=IoR
load; Therefore to realize, the step-down on impedance R1, R2 on output line is compensated, then Io (R1+R2)=IoR6 (R
fbL+ R
fbH)/R
fbL; Therefore:
R6=(R1+R2) R
fbL/ (R
fbL+ R
fbH), the resistance of R6 can design according to impedance on output line.
Pressure drop in impedance on described compensating signal and output line is proportionate relationship, and this scale-up factor is R
fbL/ (R
fbL+ R
fbH), depend on bleeder circuit.
R6 is equivalent resistance, and the impedance on described equivalent resistance and output line is proportionate relationship, and this scale-up factor is also R
fbL/ (R
fbL+ R
fbH), depend on bleeder circuit.
Above-described embodiment, does not form the restriction to this technical scheme protection domain.The amendment done within any spirit at above-mentioned embodiment and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in this technical scheme.
Claims (9)
1. an output current sample circuit for supply convertor, described supply convertor, based on continuous conduction mode, is characterized in that: comprising:
Mu balanced circuit, in each switch periods, when the moment of supply convertor master power switch pipe conducting, described mu balanced circuit receives the sampled voltage signal characterizing and flow through supply convertor master power switch tube current; When reaching the moment of master power switch pipe ON time half, described mu balanced circuit suspends reception sampled voltage signal; Described mu balanced circuit exports the first voltage signal;
Filtering circuit, receives the first voltage signal that mu balanced circuit exports, and during mu balanced circuit receives sampled voltage signal, described filtering circuit suspends reception first voltage signal; Described filtering circuit exports the second voltage signal characterizing master power switch pipe ON time half moment current value.
2. the output current sample circuit of supply convertor according to claim 1, it is characterized in that: carry out process to the second voltage signal and obtain the first current source, the current value of described first current source equals master power switch pipe ON time half moment current value; Described output current sample circuit also comprises output current and produces circuit, described output current produces the first switch and the first resistance that circuit comprises series connection mutually, in each switch periods, the first described switch conducting when the conducting of master power switch pipe, ends at the end of inductive current afterflow; Described output current produces circuit and receives described first current source, and produces voltage drop on the first resistance, and carries out equalization process to obtain characterizing the tertiary voltage signal of output current to described voltage drop.
3. the output current sample circuit of supply convertor according to claim 1 and 2, is characterized in that: described mu balanced circuit comprises second switch and voltage stabilizing element; Described filtering circuit comprises the 3rd switch and filtration module; The control end of described second switch and the 3rd switch accesses corresponding control signal respectively, second switch receives time of the first voltage signal at the control of corresponding control signal mu balanced circuit of making decision, and the 3rd switch receives time of the second voltage signal at the control of corresponding control signal filtering circuit of making decision.
4. the output current sample circuit of supply convertor according to claim 3, is characterized in that: described supply convertor based on the control model of fixing ON time, by relatively producing ON time to the first reference voltage and ramp signal; Compare described ramp signal and the second reference signal to produce the corresponding control signal controlling second switch and the 3rd switch on and off respectively, the control signal sequential logic of second switch and the 3rd switch is contrary.
5. the output current sample circuit of supply convertor according to claim 3, is characterized in that: described voltage stabilizing element is electric capacity, and described filtration module is RC filtering circuit.
6. the output voltage compensating circuit of a supply convertor, comprise the output current sample circuit described in claim 1-5 any one, described supply convertor obtains by bleeder circuit sampling and outputting voltage the voltage division signal characterizing output voltage, voltage division signal and reference voltage are compared the conducting realizing master power switch pipe, described output voltage compensation on reference voltage, applies compensating signal flow through to compensate output current the pressure drop that outlet line impedance produces, and the pressure drop in described compensating signal and outlet line impedance is proportionate relationship.
7. the output voltage compensating circuit of supply convertor according to claim 6, it is characterized in that: described compensating signal produces circuit by compensating signal and produces, described compensating signal produces circuit and comprises the second current source that equivalent resistance and current value equal output current, and described second current source flows through the pressure drop that equivalent resistance produces and is compensating signal.
8. the output voltage compensating circuit of supply convertor according to claim 7, is characterized in that: described equivalent resistance and outlet line impedance are proportionate relationship.
9. the output voltage compensating circuit of supply convertor according to claim 7, is characterized in that: the second described current source is produced after treatment by the tertiary voltage characterizing output current.
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| CN105024351B (en) * | 2015-08-14 | 2019-05-03 | 杰华特微电子（杭州）有限公司 | Based on output over-voltage protection method, protection circuit and the translation circuit sampled indirectly |
| CN106940988B (en) * | 2016-01-05 | 2019-07-02 | 奇景光电股份有限公司 | The display of this power control method of power control method and application |
| CN107257197B (en) * | 2017-06-26 | 2019-02-22 | 北京机械设备研究所 | A kind of positive current feedback control system and method applied to pulse load |
| CN108390560B (en) * | 2018-05-08 | 2024-04-19 | 杰华特微电子股份有限公司 | Control circuit and control method of step-down circuit |
| CN111596115B (en) * | 2019-02-01 | 2022-09-13 | 群光电能科技股份有限公司 | Method for measuring output current by resistance compensation and conversion circuit thereof |
| CN110361592B (en) * | 2019-07-19 | 2021-07-20 | 深圳市大能创智半导体有限公司 | Detection circuit and detection method for inductive current |
| CN110470901B (en) * | 2019-09-16 | 2021-05-28 | 棱晶半导体(南京)有限公司 | Average value sampling circuit of inductive current in switching power supply circuit |
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