CN103633836B - Average inductor current formula voltage compensation device and control method thereof - Google Patents
Average inductor current formula voltage compensation device and control method thereof Download PDFInfo
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- CN103633836B CN103633836B CN201210299698.2A CN201210299698A CN103633836B CN 103633836 B CN103633836 B CN 103633836B CN 201210299698 A CN201210299698 A CN 201210299698A CN 103633836 B CN103633836 B CN 103633836B
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Abstract
The present invention is open a kind of average inductor current formula voltage compensation device and control method thereof, and control device comprises an interconnective valley point voltage sampling keeping unit and a reference voltage generator.Valley point voltage sampling keeping unit connects the inductance in a DC-DC converter, and the electronic switch in DC-DC converter connects reference voltage generator.Valley point voltage sampling keeping unit obtains an average valley point voltage of at least two adjacent time points on inductance.Reference voltage generator then receives two times of external voltages of the average inductor current of corresponding two times of inductance, to be deducted average valley point voltage, produce a reference voltage to control electronic switch, to make the peak current on inductance keep definite value thus, and avoid the impact being subject to transducer internal inductance simultaneously.
Description
Technical field
The present invention is relevant a kind of control technology, particularly about a kind of average inductor current formula voltage compensation device and control method thereof.
Background technology
Electric pressure converter is broadly divided into several according to type difference, exchanges and delivers stream (AC/AC) transducer, interchange turns direct current (AC/DC) transducer, DC-DC (DC/DC) transducer and direct current and delivers stream (DC/AC); Wherein, with regard to DC-DC (DC/DC) transducer, in many electronic circuits, some electronic components are often had to need the Power supply of more than duplicate supply, such as liquid crystal display, voltage comparator, operational amplifier etc., or the demand of many group different potentials is had because the operating voltage organizing electronic component different more, now just need DC-DC transducer to obtain the voltage wanted.
As shown in Figure 1, DC-DC transducer 10 comprises electric capacity 12, one diode 14, inductance 16, transistor switch 18 and a resistance 20, and wherein the on off state of transistor switch 18 controlled by a feedback controller 22.In transistor switch 18 conducting (ON) stage, input power 24 has electric current and flows through inductance 16, makes energy be stored on inductance 16; And when transistor switch 18 receives pick-off signal, transistor switch 18 ends (OFF), the induced electricity now on inductance 16 fails to be convened for lack of a quorum and is discharged on resistance 20 with the output of stable maintenance voltage.Feedback controller 22 can detect the electric current on inductance 16, and goes thus to control transistor switch 18, and wherein feedback controller 22 produces and is used for controlling the control signal of transistor switch 18, with the current waveform on inductance 16 as shown in Figure 2.In the waveform of inductive current, its peak current value equals two times of average inductor current values and deducts trough current value, and in above-mentioned control signal, the time interval of low level voltage is fixing.Utilize above-mentioned negative feedback control mode, when input power 24 is increased to hundreds of volts, peak current value and trough current value no longer will keep fixing and produce and change, and in order to fixing average inductor current, when trough current value is lower, peak current value is higher; When trough current value is higher, peak current value is lower.In addition, measure waveform as shown in Figure 3, wherein dotted line waveform is the source voltage waveform of transistor switch 18, is sequentially the current waveform by diode string 26 and inductive current waveform below it.It can thus be appreciated that the peak value of inductive current and valley are constantly changing.
Therefore, the present invention is for above-mentioned puzzlement, proposes a kind of average inductor current formula voltage compensation device and control method thereof, to solve existing produced problem.
Summary of the invention
Main purpose of the present invention, be to provide a kind of average inductor current formula voltage compensation device and control method thereof, it utilizes one of on inductance at least two adjacent time points average valley point voltage, with two times of external voltages of the average inductor current of corresponding two times of inductance, with the peak current on fixed inductance, and the induced current of high voltage end (high side) need not be responded to, and avoid the separate inductor be subject in DC-DC converter to affect, to improve the accuracy of Voltage Cortrol simultaneously.
For reaching above-mentioned purpose, the invention provides a kind of average inductor current formula voltage compensation device, comprise a valley point voltage sampling keeping unit, connect the inductance in a DC-DC converter, and at least two valley point currents of at least two adjacent time points on receiving inductance, and be converted into an average valley point voltage.Valley point voltage sampling keeping unit is connected a reference voltage generator with the electronic switch in DC-DC converter simultaneously, it is and receives two times of external voltages of the average inductor current of corresponding two times of inductance, to be deducted average valley point voltage, produce a reference voltage to control electronic switch, keep definite value to make the peak current on inductance thus.
Wherein, described DC-DC converter is the DC-DC converter of firm deadline.
Wherein, more comprise a comparator, it connects described inductance, described valley point voltage sampling keeping unit, described reference voltage generator and described electronic switch, to receive the inductive drop of described reference voltage and described inductance, and according to its comparative result, control described electronic switch, keep described definite value to make described peak current thus.
Wherein, described reference voltage and described inductive drop different time, electronic switch described in described comparator conducting, reaches described definite value to make described peak current thus.
Wherein, when described reference voltage is identical with described inductive drop, described electronic switch closed by described comparator.
Wherein, described two valley point currents comprise respectively corresponding first, after one first valley point current of described time point and one second valley point current, described average valley point voltage is one the first half valley point voltage of respectively corresponding described first valley point current and described second valley point current and the summation of one the second half valley point voltage, and described valley point voltage sampling keeping unit more comprises:
One first sequence switch, connects described inductance, and in the temporary transient conducting of described two adjacent time point, to pass through for described first valley point current and described second valley point current respectively;
One first valley point voltage holding unit, connects described first sequence switch, to receive described first valley point current or described second valley point current, and is converted into described the first half valley point voltages or described the second half valley point voltages respectively, and keeps it to export;
One second sequence switch, connects described first valley point voltage holding unit, and between described two adjacent time points, and when described inductive current declines gradually, temporary transient conducting, using the transfer path as described the first half valley point voltages; And
One second valley point voltage holding unit, connects described second sequence switch, to receive described the first half valley point voltages, and keeps it to export.
Wherein, described first valley point voltage holding unit more comprises:
One first amplifier, connects described first sequence switch, to receive described first valley point current or described second valley point current, exports one first Continuity signal or one second Continuity signal respectively;
One the first transistor switch, connects described first amplifier and described reference voltage generator, and receives described first Continuity signal or described second Continuity signal to keep conducting;
One first electric capacity, one end ground connection, the other end connects described first sequence switch and described first amplifier; And
One first resistance, one end ground connection, the other end connects described the first transistor switch and described first amplifier, described first electric capacity and described first resistance receive described first valley point current or described second valley point current by described first sequence switch, and be converted into described the first half valley point voltages or described the second half valley point voltages, to be kept exporting described the first half valley point voltages or described the second half valley point voltages by described the first transistor switch; And
Described second valley point voltage holding unit more comprises:
One second amplifier, connects described second sequence switch, to receive described the first half valley point voltages, exports one the 3rd Continuity signal;
One transistor seconds switch, connects described second amplifier and described reference voltage generator, and receives described 3rd Continuity signal to keep conducting;
One second electric capacity, one end ground connection, the other end connects described second sequence switch and described second amplifier; And
One second resistance, one end ground connection, the other end connects described transistor seconds switch and described second amplifier, described second resistance is identical with the resistance of described first resistance, described second electric capacity and described second resistance receive described the first half valley point voltages by described second sequence switch, to be kept described the first half valley point voltages of output by described transistor seconds switch.
Wherein, described reference voltage generator more comprises:
One the 3rd amplifier, receives described two times of external voltages, to produce one the 4th Continuity signal;
One the 3rd resistance, its resistance is the half of described first resistance, one end ground connection of described 3rd resistance, and the other end connects described 3rd amplifier;
One third transistor switch, connects described 3rd amplifier and described 3rd resistance, to receive described 4th Continuity signal, and produces by described 3rd resistance the two times of described average inductor current flowing through described third transistor switch and described 3rd resistance;
One current mirror, connects described third transistor switch; And
One the 4th resistance, its resistance is identical with described 3rd resistance, one end ground connection of described 4th resistance, the other end connects described current mirror, described current mirror copies described two times of described average inductor current, to produce two times of described average inductor current by described 4th resistance, and produces described two times of external voltages accordingly, to be deducted described the first half valley point voltages and described the second half valley point voltages, produce described reference voltage.
Wherein, more comprise time schedule controller, it connects described first sequence switch, described second sequence switch and described inductance, and described in the temporary transient conducting of described two adjacent time point the first sequence switch, and between described two adjacent time points, and described inductive current is when declining gradually, the second sequence switch described in temporary transient conducting.
Wherein, when described time point and described valley point current are all multiple, described average valley point voltage for the summation of valley point voltage corresponding to valley point current described in each average.
The present invention also provides a kind of average inductor current formula voltage compensation method, and it is control one DC-DC converter, and this DC-DC converter comprises an electronic switch and an inductance.First, receive at least two valley point currents of at least two adjacent time points on two times of external voltages of the average inductor current of corresponding two times of inductance and inductance, and at least two valley point currents are converted to an average valley point voltage.Then, two times of external voltages are deducted average valley point voltage, to export the reference voltage controlling electronic switch.
Wherein, more comprise a step, it is the inductive drop receiving described reference voltage and described inductance, and according to its comparative result, controls described electronic switch, keeps definite value to make the peak current on described inductance thus.
Wherein, described comparative result be described reference voltage identical with described inductive drop time, described electronic switch cuts out.
Wherein, described comparative result be described reference voltage and described inductive drop different time, described electronic switch conducting, keeps described definite value to make described peak current thus.
Wherein, described DC-DC converter is the DC-DC converter of firm deadline.
Wherein, when described time point and described valley point current are all multiple, described average valley point voltage for the summation of valley point voltage corresponding to valley point current described in each average.
Hereby further understand and understanding for making your juror more have architectural feature of the present invention and effect of reaching, careful assistant is with preferred embodiment figure and coordinate detailed description, illustrates as rear:
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the DC-DC converter of prior art;
Fig. 2 is the inductive current of prior art and the voltage oscillogram controlling transistor switch;
Fig. 3 is the source voltage of the transistor switch of prior art, diode crosstalk stream and inductive current oscillogram;
Fig. 4 is the control device circuit diagram of reception two valley point current of the present invention;
Fig. 5 is inductive current of the present invention and the voltage oscillogram controlling transistor switch;
Fig. 6 is the source voltage of transistor of the present invention, diode crosstalk stream and inductive current oscillogram;
Fig. 7 is the control device circuit diagram of the multiple valley point current of reception of the present invention.
Description of reference numerals: 10-DC-DC transducer; 12-electric capacity; 14-diode; 16-inductance; 18-transistor switch; 20-resistance; 22-feedback controller; 24-input power; 26-diode string; 28-DC-DC converter; 30-inductance; 32-transistor switch; 34-valley point voltage sampling keeping unit; 36-reference voltage generator; 37-valley point voltage sampling keeping unit; 38-comparator; 40-diode string; 42-first sequence switch; 44-first valley point voltage holding unit; 46-second sequence switch; 48-second valley point voltage holding unit; 49-time schedule controller; 50-first amplifier; 52-the first transistor switch; 54-first electric capacity; 56-first resistance; 58-second amplifier; 60-transistor seconds switch; 62-second electric capacity; 64-second resistance; 66-the 3rd amplifier; 68-the 3rd resistance; 70-third transistor switch; 72-current mirror; 74-the 4th resistance.
Embodiment
Add that the half of peak inductive current summation controlled because inductance ripple current is subject to valley inductor current, namely this represent that peak inductive current Ipeak equals two times of average inductor current Iavg to cut valley inductor current Ivally, shown in (1).But the present invention is in order to fixed peak inductor current Ipeak, therefore above-mentioned valley inductor current Ivally is revised as the adjacent valley inductor current Iv1 of at least two time points, the average of Iv2, shown in (2), to avoid the variation of valley inductor current Ivally to count.According to above-mentioned principle, the present invention is by two times of external voltage Vext of the average inductor current of corresponding two times of inductance, deduct the mean value of valley point voltage Vh1, Vh2 of at least two adjacent time points on inductance, the average valley point voltage of this mean value and valley point voltage Vh1, Vh2, a reference voltage Vref can be obtained after subtracting each other, shown in (3), and fixed peak inductor current Ipeak accordingly.
Ipeak＝2*Iavg-Ivally (1)
Ipeak＝2*Iavg-(Iv1+Iv2)/2 (2)
Vref＝2*Vext-(Vh1+Vh2)/2 (3)
Below refer to Fig. 4.The present invention connects the DC-DC converter 28 of a firm deadline, and wherein comprise inductance 30 and an electronic switch, in the present embodiment, this electronic switch is for transistor switch 32.The present invention comprises valley point voltage sampling keeping unit 34 and a reference voltage generator 36, valley point voltage sampling keeping unit 34 connects inductance 30 by transistor switch 32, and at least two valley point currents of at least two adjacent time points on receiving inductance 30, and be converted into an average valley point voltage.Reference voltage generator 36 connects valley point voltage sampling keeping unit 34 and transistor switch 32, and receives two times of external voltage Vext of the average inductor current Iave of corresponding two times of inductance 30, to be deducted average valley point voltage, produces a reference voltage Vref.Inductance 30, valley point voltage sampling keeping unit 34, reference voltage generator 36 and transistor switch 32 are all connected a comparator 38, it is the inductive drop receiving reference voltage Vref and inductance 30, and according to its comparative result, control transistor switch 32, keep definite value to make peak current thus.
In other words, operation of the present invention is as follows.First, reference voltage generator 36 receives two times of external voltage Vext of the average inductor current Iave of corresponding two times of inductance 30, simultaneously, at least two valley point currents of at least two adjacent time points on valley point voltage sampling keeping unit 34 receiving inductance 30, and at least two valley point currents are converted to an average valley point voltage.Then, receive two times of external voltage Vext are deducted average valley point voltage by reference voltage generator 36, to produce the reference voltage Vref controlling transistor switch 32.Finally, comparator 38 receives the inductive drop of reference voltage Vref and inductance 30, and according to its comparative result, controls transistor switch 32, keeps definite value to make the peak current on inductance 30 thus.For example, when comparative result be reference voltage identical with inductive drop time, then make transistor switch 32 close; When comparative result is reference voltage and inductive drop is different, then make transistor switch 32 conducting.Comparator 38 produces and is used for controlling the control signal of transistor switch 32, with the current waveform on inductance 30 as shown in Figure 5, wherein the time interval of the high levle voltage of control signal is fixing, and the peak current on inductance 30 and valley point current also become fixing.In addition, measure waveform as shown in Figure 6, wherein dotted line waveform is the source voltage waveform of transistor switch 32, is sequentially the current waveform of current waveform by diode string 40 and inductance 30 below it.It can thus be appreciated that, the peak value of inductive current and valley be presented fixing.Thus, the present invention just can respond to the induced current of high voltage end (high side), and avoids the separate inductor be subject in DC-DC converter to affect, to improve the accuracy of Voltage Cortrol simultaneously.
At said process, if the present invention lacks comparator 38, also can omit the inductive drop of above-mentioned reception reference voltage Vref and inductance 30, and according to its comparative result, control the step of transistor switch 32.
Please continue to refer to Fig. 4, the physical circuit describing valley point voltage sampling keeping unit 34 and reference voltage generator 36 will be continued below.
Above-mentioned two valley point currents comprise respectively corresponding first, after one first valley point current of time point and one second valley point current, average valley point voltage is one the first half valley point voltage of corresponding first valley point current and the second valley point current respectively and the summation of one the second half valley point voltage.Valley point voltage sampling keeping unit 34 only comprises two sub-valley point voltage sampling keeping units 37 at this, to capture the first half valley point voltages and the second half valley point voltages respectively.Wherein a sub-valley point voltage sampling keeping unit 37 more comprises one first sequence switch 42 and one first valley point voltage holding unit 44, and another sub-valley point voltage sampling keeping unit 37 more comprises one second sequence switch 46 and one second valley point voltage holding unit 48.First sequence switch 42 connects inductance 30, and in the temporary transient conducting of two adjacent time points, to pass through for the first valley point current and the second valley point current respectively.First sequence switch 42 connects the first valley point voltage holding unit 44, and it receives the first valley point current or the second valley point current from the first sequence switch 42, and is converted into the first half valley point voltages or the second half valley point voltages respectively, and keeps it to export.First valley point voltage holding unit 44 connects the second sequence switch 46, and it is between two adjacent time points, and when inductive current declines gradually, temporary transient conducting, using the transfer path as the first half valley point voltages.Second sequence switch 46 connects the second valley point voltage holding unit 48, and it receives the first half valley point voltages from the second sequence switch 46, and keep it to export.
The conducting state of the first sequence switch 42, second sequence switch 46 is controlled by time schedule controller 49.First sequence switch 42, second sequence switch 46 is connected this time schedule controller 49 with inductance 30, it is at two adjacent time points temporary transient conducting first sequence switch 42, and between two adjacent time points, and when inductive current declines gradually, temporary transient conducting second sequence switch 46.
First valley point voltage holding unit 44 more comprises one first amplifier 50, and it is connection first sequence switch 42, to receive the first valley point current or the second valley point current, exports one first Continuity signal or one second Continuity signal respectively.First amplifier 50 is connected a first transistor switch 52 with reference voltage generator 36, and it is that reception first Continuity signal or the second Continuity signal are to keep conducting.Separately have one end ground connection of one first electric capacity 54 and one first resistance 56, first electric capacity 54, the other end connects the first sequence switch 42 and the first amplifier 50.One end ground connection of the first resistance 56, the other end connects the first transistor switch 52 and the first amplifier 50, first electric capacity 54 and the first resistance 56 receive the first valley point current or the second valley point current by the first sequence switch 42, and be converted into the first half valley point voltages or the second half valley point voltages, to be kept output the first half valley point voltage or the second half valley point voltages by the first transistor switch 52.
Second valley point voltage holding unit 48 more comprises one second amplifier 58, and it is connection second sequence switch 46, to receive the first half valley point voltages, exports one the 3rd Continuity signal.Second amplifier 58 is connected a transistor seconds switch 60 with reference voltage generator 36, and it is that reception the 3rd Continuity signal is to keep conducting.Separately have one end ground connection of one second electric capacity 62 and one second resistance 64, second electric capacity 62, the other end connects the second sequence switch 46 and the second amplifier 58.One end ground connection of the second resistance 64, the other end connects transistor seconds switch 60 and the second amplifier 58, second resistance 64 is identical with the resistance of the first resistance 56, second electric capacity 62 and the second resistance 64 receive the first half valley point voltages by the second sequence switch 46, to be kept output the first half valley point voltage by transistor seconds switch 60.
Reference voltage generator 36 more comprises one the 3rd amplifier 66, and it is reception two times of external voltage Vext, to produce one the 4th Continuity signal.3rd amplifier 66 connects one end of one the 3rd resistance 68, the other end then ground connection of the 3rd resistance 68, and in addition, the resistance of the 3rd resistance 68 is the half of the first resistance 56.3rd amplifier 66 is connected a third transistor switch 70 with the 3rd resistance 68, and it is reception the 4th Continuity signal, and is produced the two times of average inductor current Iave flowing through third transistor switch 70 and the 3rd resistance 68 by the 3rd resistance 68.Third transistor switch 70 connects again a current mirror 72, and current mirror 72 connects one end of one the 4th resistance 74, the other end then ground connection of the 4th resistance 74.The resistance of the 4th resistance 74 is identical with the 3rd resistance 68.Current mirror 72 copies two times of average inductor current Iave, to produce two times of average inductor current Iave by the 4th resistance 74, and produce two times of external voltage Vext accordingly, to be deducted the first half valley point voltages and the second half valley point voltages, successfully produce reference voltage Vref.
Above-described embodiment only receives two valley point currents to form average valley point voltage, below refers to the 7th figure, and this embodiment and above-described embodiment difference are, valley point voltage sampling keeping unit 34 comprises multiple sub-valley point voltage sampling keeping unit 37 at this.Therefore, in this embodiment, multiple valley point currents of the multiple adjacent time points on valley point voltage sampling keeping unit 34 receiving inductance, and be converted into an average valley point voltage, this average valley point voltage Vave is made to be that the summation of the valley point voltage Vhn that each valley point current is corresponding is average, shown in (4).Another remaining circuit framework and start all identical with previous embodiment, repeat no more in this.
Vave＝(Vh1+Vh2+…+Vhn)/n (4)
In sum, the present invention adopts the inductor valley current of adjacent two time points, with fixed inductance peak current, and then improves the accuracy of DC-DC converter.
As described above, be only a preferred embodiment of the present invention, not be used for limiting scope of the invention process, therefore the equalization of such as doing according to shape, structure, feature and the spirit described in the present patent application the scope of the claims changes and modifies, and all should be included in claim of the present invention.
Claims (16)
1. an average inductor current formula voltage compensation device, is characterized in that, it is connection one DC-DC converter, and described average inductor current formula voltage compensation device comprises:
One valley point voltage sampling keeping unit, connects the inductance in described DC-DC converter, and receives at least two valley point currents of at least two adjacent time points on described inductance, and is converted into an average valley point voltage; And
One reference voltage generator, connect the electronic switch in described valley point voltage sampling keeping unit and described DC-DC converter, and receive two times of external voltages of the average inductor current of corresponding two times of described inductance, to be deducted described average valley point voltage, produce a reference voltage to control described electronic switch, keep definite value to make the peak current on described inductance thus.
2. average inductor current formula voltage compensation device according to claim 1, it is characterized in that, described DC-DC converter is the DC-DC converter of firm deadline.
3. average inductor current formula voltage compensation device according to claim 1, it is characterized in that, more comprise a comparator, it connects described inductance, described valley point voltage sampling keeping unit, described reference voltage generator and described electronic switch, to receive the inductive drop of described reference voltage and described inductance, and according to its comparative result, control described electronic switch, keep described definite value to make described peak current thus.
4. average inductor current formula voltage compensation device according to claim 3, is characterized in that, described reference voltage and described inductive drop different time, electronic switch described in described comparator conducting, reaches described definite value to make described peak current thus.
5. average inductor current formula voltage compensation device according to claim 3, it is characterized in that, when described reference voltage is identical with described inductive drop, described electronic switch closed by described comparator.
6. average inductor current formula voltage compensation device according to claim 1, it is characterized in that, described two valley point currents comprise respectively corresponding first, after one first valley point current of described time point and one second valley point current, described average valley point voltage is one the first half valley point voltage of respectively corresponding described first valley point current and described second valley point current and the summation of one the second half valley point voltage, and described valley point voltage sampling keeping unit more comprises:
One first sequence switch, connects described inductance, and in the temporary transient conducting of described two adjacent time point, to pass through for described first valley point current and described second valley point current respectively;
One first valley point voltage holding unit, connects described first sequence switch, to receive described first valley point current or described second valley point current, and is converted into described the first half valley point voltages or described the second half valley point voltages respectively, and keeps it to export;
One second sequence switch, connects described first valley point voltage holding unit, and between described two adjacent time points, and when described inductive current declines gradually, temporary transient conducting, using the transfer path as described the first half valley point voltages; And
One second valley point voltage holding unit, connects described second sequence switch, to receive described the first half valley point voltages, and keeps it to export.
7. average inductor current formula voltage compensation device according to claim 6, is characterized in that, described first valley point voltage holding unit more comprises:
One first amplifier, connects described first sequence switch, to receive described first valley point current or described second valley point current, exports one first Continuity signal or one second Continuity signal respectively;
One the first transistor switch, connects described first amplifier and described reference voltage generator, and receives described first Continuity signal or described second Continuity signal to keep conducting;
One first electric capacity, one end ground connection, the other end connects described first sequence switch and described first amplifier; And
One first resistance, one end ground connection, the other end connects described the first transistor switch and described first amplifier, described first electric capacity and described first resistance receive described first valley point current or described second valley point current by described first sequence switch, and be converted into described the first half valley point voltages or described the second half valley point voltages, to be kept exporting described the first half valley point voltages or described the second half valley point voltages by described the first transistor switch; And
Described second valley point voltage holding unit more comprises:
One second amplifier, connects described second sequence switch, to receive described the first half valley point voltages, exports one the 3rd Continuity signal;
One transistor seconds switch, connects described second amplifier and described reference voltage generator, and receives described 3rd Continuity signal to keep conducting;
One second electric capacity, one end ground connection, the other end connects described second sequence switch and described second amplifier; And
One second resistance, one end ground connection, the other end connects described transistor seconds switch and described second amplifier, described second resistance is identical with the resistance of described first resistance, described second electric capacity and described second resistance receive described the first half valley point voltages by described second sequence switch, to be kept described the first half valley point voltages of output by described transistor seconds switch.
8. average inductor current formula voltage compensation device according to claim 7, it is characterized in that, described reference voltage generator more comprises:
One the 3rd amplifier, receives described two times of external voltages, to produce one the 4th Continuity signal;
One the 3rd resistance, its resistance is the half of described first resistance, one end ground connection of described 3rd resistance, and the other end connects described 3rd amplifier;
One third transistor switch, connects described 3rd amplifier and described 3rd resistance, to receive described 4th Continuity signal, and produces by described 3rd resistance the two times of described average inductor current flowing through described third transistor switch and described 3rd resistance;
One current mirror, connects described third transistor switch; And
One the 4th resistance, its resistance is identical with described 3rd resistance, one end ground connection of described 4th resistance, the other end connects described current mirror, described current mirror copies described two times of described average inductor current, to produce two times of described average inductor current by described 4th resistance, and produces described two times of external voltages accordingly, to be deducted described the first half valley point voltages and described the second half valley point voltages, produce described reference voltage.
9. average inductor current formula voltage compensation device according to claim 6, it is characterized in that, more comprise time schedule controller, it connects described first sequence switch, described second sequence switch and described inductance, and described in the temporary transient conducting of described two adjacent time point the first sequence switch, and between described two adjacent time points, and when described inductive current declines gradually, the second sequence switch described in temporary transient conducting.
10. average inductor current formula voltage compensation device according to claim 1, is characterized in that, when described time point and described valley point current are all multiple, described average valley point voltage for the summation of valley point voltage corresponding to valley point current described in each average.
11. 1 kinds of average inductor current formula voltage compensation methods, it is characterized in that, it is control one DC-DC converter, and described DC-DC converter comprises an electronic switch and an inductance, and described average inductor current formula voltage compensation method comprises the following step:
Receive at least two valley point currents of at least two adjacent time points on two times of external voltages of the average inductor current of corresponding two times of described inductance and described inductance, and described at least two valley point currents are converted to an average valley point voltage; And
Described two times of external voltages are deducted described average valley point voltage, to export the reference voltage controlling described electronic switch.
12. average inductor current formula voltage compensation methods according to claim 11, it is characterized in that, more comprise a step, it is the inductive drop receiving described reference voltage and described inductance, and according to its comparative result, control described electronic switch, keep definite value to make the peak current on described inductance thus.
13. average inductor current formula voltage compensation methods according to claim 12, is characterized in that, described comparative result be described reference voltage identical with described inductive drop time, described electronic switch cuts out.
14. average inductor current formula voltage compensation methods according to claim 12, it is characterized in that, described comparative result be described reference voltage and described inductive drop different time, described electronic switch conducting, keeps described definite value to make described peak current thus.
15. average inductor current formula voltage compensation methods according to claim 11, it is characterized in that, described DC-DC converter is the DC-DC converter of firm deadline.
16. average inductor current formula voltage compensation methods according to claim 11, it is characterized in that, when described time point and described valley point current are all multiple, described average valley point voltage for the summation of valley point voltage corresponding to valley point current described in each average.
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| US7737668B2 (en) * | 2007-09-07 | 2010-06-15 | Panasonic Corporation | Buck-boost switching regulator |
| US7710084B1 (en) * | 2008-03-19 | 2010-05-04 | Fairchild Semiconductor Corporation | Sample and hold technique for generating an average of sensed inductor current in voltage regulators |
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| CN102324848A (en) * | 2005-04-18 | 2012-01-18 | 凌特公司 | Switching regulaor and control method thereof |
| CN101242143A (en) * | 2007-02-08 | 2008-08-13 | 凌力尔特有限公司 | Adaptive output current control for switching circuits |
| CN101286704A (en) * | 2007-04-13 | 2008-10-15 | 凌特公司 | Determining average output current in dc-dc converter |
| US7855539B1 (en) * | 2007-05-14 | 2010-12-21 | National Semiconductor Corporation | Circuit and method for adaptive current limit control in a power converter |
| CN102026443A (en) * | 2009-09-18 | 2011-04-20 | 立锜科技股份有限公司 | Average current regulator and driver circuit thereof and method for regulating average current |
| CN102104334A (en) * | 2009-12-18 | 2011-06-22 | 凌特公司 | Clean transition between CCM and DCM in valley current mode control of DC-to-DC converter |
Also Published As
| Publication number | Publication date |
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| TWI478476B (en) | 2015-03-21 |
| CN103633836A (en) | 2014-03-12 |
| TW201409913A (en) | 2014-03-01 |
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