CN109004822A - The feedback method and feed circuit of DC-DC conversion circuit - Google Patents
The feedback method and feed circuit of DC-DC conversion circuit Download PDFInfo
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- CN109004822A CN109004822A CN201810785450.4A CN201810785450A CN109004822A CN 109004822 A CN109004822 A CN 109004822A CN 201810785450 A CN201810785450 A CN 201810785450A CN 109004822 A CN109004822 A CN 109004822A
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- voltage
- conversion circuit
- feedback
- point
- output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to the feedback methods and feed circuit of a kind of DC-DC conversion circuit.The feedback method of the DC-DC conversion circuit includes: step 10, is previously obtained the feedback point of DC-DC conversion circuit output voltage to the impedance of point of use；For the voltage output end of DC-DC conversion circuit via cabling to the voltage input end output voltage of chip, position of the feedback point in the voltage output end for closing on DC-DC conversion circuit on cabling, point of use is in the position for closing on the voltage input end of chip on cabling；The output electric current that step 20, detecting DC-DC conversion circuit are exported to chip；Step 30, according to output electric current and impedance, calculate the voltage deviation between the feedback point and the point of use；Feedback point voltage is subtracted the voltage deviation by step 40, obtains final feedback voltage.The present invention also provides the feed circuits of DC-DC conversion circuit.The present invention can make up for it pressure drop caused by useless line loss when DC-DC conversion circuit output voltage in display panel, guarantee the normal work of the various driving circuits of display panel.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of feedback methods and feed circuit of DC-DC conversion circuit.
Background technique
For current display panel designs trend, the increasing problem of size of display panels can be encountered,
Simultaneously in order to reduce cost, the framework of X+C (X plate+control panel), in this case, various DC-DC in display panel can be used
The development trend of output electric current when (DC-DC) conversion circuit output voltage is to be gradually increased, but can be used for arranging
The width of cabling can be smaller and smaller, and cabling can increasingly be grown, then the pressure drop on cabling also can be increasing, useless line loss
Caused pressure drop causes voltage required for the point of use panel driving obtained of DC-DC conversion circuit output voltage that can drop
It is low, even it is lower than required voltage range lower limit.Although existing DC-DC conversion circuit has corresponding feed circuit, pass through
Feed circuit introduces feedback point voltage and controls the output voltage of DC-DC conversion circuit, and feedback point is directly pulled to use
Point, since feedback cabling is too long, equally will cause output voltage shakiness although this method can reduce voltage drop
Problem.
It is DC-DC conversion circuit application scenarios schematic diagram in existing display panel referring to Fig. 1.1 institute of power management chip
Output voltage is converted through DC-DC conversion circuit 2, DC-DC conversion circuit 2 again by transformed voltage be delivered to chip 3 by
Chip 3 carry out using；DC-DC conversion circuit 2 can be reduction voltage circuit or other kinds of circuit, and chip 3 can be timing
The chips such as controller or source electrode driver；The voltage output end of DC-DC conversion circuit 2 is between the voltage input end of chip 3
Cabling it is very long, according to the prior art, the feedback point of 2 output voltage of DC-DC conversion circuit on cabling in closes on DC-DC turn
The position of the voltage output end of circuit 2 is changed, and the point of use of 2 output voltage of DC-DC conversion circuit is in proximate core on cabling
The position of the voltage input end of piece 3, part of the cabling between feedback point and point of use form equivalent impedance 4, cause useless
Line loss.To solve pressure drop caused by above-mentioned useless line loss, cause the problem of output voltage shakiness, currently used method be by
DC-DC conversion circuit output voltage is turned up, but this method is easy to encounter in booting, each DC-DC conversion circuit output
No current exports when voltage, may limit, cause beyond its demand to the voltage that the end chip (IC) is output voltage point of use
The damage of chip.
Summary of the invention
Therefore, it the purpose of the present invention is to provide the feedback method and feed circuit of a kind of DC-DC conversion circuit, makes up aobvious
Show pressure drop caused by useless line loss when DC-DC conversion circuit output voltage in panel.
To achieve the above object, the present invention provides a kind of feedback methods of DC-DC conversion circuit, comprising:
Step 10 is previously obtained the feedback point of DC-DC conversion circuit output voltage to the impedance of point of use；DC-DC conversion
Via cabling to the voltage input end output voltage of chip, the feedback point is on cabling to be closed on the voltage output end of circuit
The position of the voltage output end of DC-DC conversion circuit, the point of use is on cabling in the voltage input end for closing on chip
Position；
The output electric current that step 20, detecting DC-DC conversion circuit are exported to chip；
Step 30, according to output electric current and impedance, calculate the voltage deviation between the feedback point and the point of use；
Feedback point voltage is subtracted the voltage deviation by step 40, obtains final feedback voltage.
Wherein, further includes: step 50, according to final feedback voltage adjusts the output voltage of DC-DC conversion circuit.
Wherein, such as the final feedback voltage is greater than preset value, then reduces the output voltage of DC-DC conversion circuit；As institute
Final feedback voltage is stated less than preset value, then improves the output voltage of DC-DC conversion circuit
Wherein, the impedance is measured by multimeter actual amount.
Wherein, the impedance is calculated by cabling layout designs.
The present invention also provides a kind of feed circuits of DC-DC conversion circuit, comprising:
Impedance module provides the feedback point for the DC-DC conversion circuit output voltage being previously obtained to the impedance of point of use；
The voltage output end of DC-DC conversion circuit is via cabling to the voltage input end output voltage of chip, and the feedback point is in cabling
The upper position in the voltage output end for closing on DC-DC conversion circuit, the point of use is on cabling in the electricity for closing on chip
Press the position of input terminal；
Export current detecting module, the output electric current exported for detecting DC-DC conversion circuit to chip；
Offset computing module, for calculating the feedback point and the point of use according to the output electric current and impedance
Between voltage deviation；
Final feedback voltage computing module is finally fed back for feedback point voltage to be subtracted the voltage deviation
Voltage.
Wherein, the impedance is measured by multimeter actual amount.
Wherein, the impedance is calculated by cabling layout designs.
Wherein, the offset computing module is trans-impedance amplifier multiplier, the first inverting input terminal input and output electricity
Stream connects the impedance with the second input end grounding of phase, and output end exports the offset of the voltage of feedback point.
Wherein, the final feedback voltage computing module be subtracter, inverting input terminal input feedback point voltage it is inclined
Shifting amount, non-inverting input terminal input feedback point voltage, output end export final feedback voltage.
It wherein, further include feedback control module, for carrying out feedback control to DC-DC conversion circuit according to final feedback voltage
System.
To sum up, the feedback method and feed circuit of DC-DC conversion circuit of the present invention, can make up for it DC-DC in display panel
Pressure drop caused by useless line loss when conversion circuit output voltage guarantees the normal work of the various driving circuits of display panel.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
In attached drawing,
Fig. 1 is DC-DC conversion circuit application scenarios schematic diagram in existing display panel；
Fig. 2 is the flow chart of the feedback method of DC-DC conversion circuit of the present invention；
Fig. 3 is the circuit block diagram of the feed circuit of DC-DC conversion circuit of the present invention；
Fig. 4 is the circuit diagram of one preferred embodiment of feed circuit of DC-DC conversion circuit of the present invention.
Specific embodiment
It referring to fig. 2, is the flow chart of the feedback method of DC-DC conversion circuit of the present invention.DC-DC conversion circuit of the present invention
Feedback method output electric current is measured during DC-DC conversion circuit output voltage, according to the size of output electric current and pre-
The DC-DC conversion circuit output voltage feedback point first obtained calculates the voltage deviation of feedback point, in turn to the impedance of point of use
Final feedback voltage is obtained, final feedback voltage can be used to confirm the final output voltage of DC-DC conversion circuit.Main packet
It includes:
Step 10 is previously obtained the feedback point of DC-DC conversion circuit output voltage to the impedance of point of use；DC-DC conversion
Via cabling to the voltage input end output voltage of chip, the feedback point is on cabling to be closed on the voltage output end of circuit
The position of the voltage output end of DC-DC conversion circuit, the point of use is on cabling in the voltage input end for closing on chip
Position；Output resistance corresponding to each output voltage is reserved when the feed circuit to DC-DC conversion circuit is designed, in circuit
Anti- selection, for the subsequent voltage deviation for calculating feedback point；Output impedance, that is, output voltage feedback point is to point of use
Between impedance, this usual a part of impedance can be measured by the way that multimeter is practical, or be designed in cabling layout (Layout)
When be obtained by calculation；
The output electric current that step 20, detecting DC-DC conversion circuit are exported to chip；Common using existing feed circuit is set
Meter detects DC-DC conversion circuit output electric current；
Step 30, according to output electric current and impedance, calculate the voltage deviation between the feedback point and the point of use；
Electric current and impedance input chip or related circuit module will be exported, output electric current will be multiplied with impedance, utilizes chip or corresponding electric
Road module calculates loss of the output voltage between feedback point and point of use on cabling, that is, the voltage deviation of feedback point
Size；
Feedback point voltage is subtracted the voltage deviation by step 40, obtains final feedback voltage；Utilize the voltage of calculating
Offset does reversed adjustment to feedback point voltage, obtains final feedback voltage；
Can further include: step 50, according to final feedback voltage adjusts the output voltage of DC-DC conversion circuit；It will
Obtained final feedback voltage is added in the feed circuit of entire DC-DC conversion circuit, such as the final feedback voltage
Greater than preset value, then the output voltage of DC-DC conversion circuit is reduced, such as the final feedback voltage is less than preset value, then improves
The output voltage of DC-DC conversion circuit；Suitable output voltage is obtained by controlling DC-DC conversion circuit, and then core can be made
Bit end, that is, output voltage point of use obtains accurate voltage.
Referring to Fig. 3 and Fig. 4, Fig. 3 is the circuit block diagram of the feed circuit of DC-DC conversion circuit of the present invention, and Fig. 4 is this hair
The circuit diagram of a bright preferred embodiment.In conjunction with Fig. 3 and Fig. 4 it is found that the feed circuit needle of DC-DC conversion circuit of the invention
To the size of output electric current Current, the voltage deviation Vloss of feedback point voltage VFB is calculated, feedback point voltage VFB is done
Reversed adjustment, obtains final feedback voltage V FB_final, defeated needed for being obtained at this time according to final feedback voltage V FB_final
Voltage out；It specifically includes that impedance module 100, provides the feedback point of the DC-DC conversion circuit output voltage being previously obtained to using
The impedance of point；The voltage output end of DC-DC conversion circuit is via cabling to the voltage input end output voltage of chip, the feedback
Position of the point in the voltage output end for closing on DC-DC conversion circuit on cabling, the point of use is on cabling closes on
The position of the voltage input end of chip；Current detecting module 200 is exported, for detecting the output electric current of DC-DC conversion circuit；Partially
Shifting amount computing module 300, for according to output electric current and DC-DC conversion circuit output voltage feedback point to point of use resistance
It is anti-, calculate the voltage deviation of feedback point；Final feedback voltage computing module 400, for feedback point voltage to be subtracted feedback point
Voltage deviation, obtain final feedback voltage；And feedback control module 500, it is used for according to final feedback voltage to DC-DC
Conversion circuit carries out feedback control；If the final feedback voltage is greater than preset value, then the output electricity of DC-DC conversion circuit is reduced
Pressure；If the final feedback voltage is less than preset value, then the output voltage of DC-DC conversion circuit is improved.
Impedance module 100 is specifically as follows preset fixed resistance, so as to directly provide impedance of corresponding size；Or
Person also can use the size of other amounts secondary indication resistance, for example through the timing of electric current one of resistance, ohmically voltage with
Resistance sizes are directly proportional.As shown in figure 4, indicating to be previously obtained DC- with fixed preset resistance Rset in the preferred embodiment
Impedance of the feedback point of DC conversion circuit output voltage to point of use；It has been observed that usually preset resistance Rset can pass through general-purpose
Table is practical to be measured, or is obtained by calculation in cabling layout (Layout) design.
Offset computing module 300 is for the size of output electric current Current and the size for the impedance being previously obtained, energy
The size of the voltage deviation Vloss of feedback point voltage VFB is enough calculated, voltage deviation Vloss is output voltage in cabling
On loss；Offset computing module 300 can be the structures such as the chip of realization corresponding function or circuit module, as shown in Figure 4
It is specifically as follows multiplier OP1, first input end input and output electric current Current, the second input terminal connects preset resistance
Rset, output end exports the voltage deviation Vloss of feedback point voltage, by that will export electric current Current and preset resistance
Rset is multiplied to obtain voltage deviation Vloss.
Voltage deviation Vloss and feedback point voltage VFB is carried out subtraction by final feedback voltage computing module 400,
Obtained final feedback voltage V FB_final；Final feedback voltage computing module 400 can for realize corresponding function chip or
The structures such as circuit module, are specifically as follows subtracter OP2 as shown in Figure 3, and inverting input terminal connects the output of multiplier OP1
End, the voltage deviation Vloss of input feedback point, non-inverting input terminal input feedback point voltage VFB, the final feedback of output end output
Voltage VFB_final.
Other for example export the detecting and feedback control module of 200 couples of current detecting module output electric current Current
500 carry out feedback control to DC-DC conversion circuit to obtain output electricity required at this time according to final feedback voltage V FB_final
Pressure is the common setting of present feed circuit, no longer describes.Feed circuit of the invention passes through compared to existing feed circuit
Offset computing module 300 and final feedback voltage computing module 400 obtain reflection output voltage point of use at situation it is final
Feedback voltage V FB_final is controlled instead of output voltage of the feedback point voltage VFB to DC-DC conversion circuit, and will be fed back
The effect that point is directly pulled to point of use is consistent, while avoiding the too long problem of feedback cabling.
The feedback method and feed circuit of DC-DC conversion circuit through the invention, can make DC-DC conversion circuit not
It is all most suitable with the voltage for obtaining, die terminals i.e. output voltage point of use under service condition and under different output current
's.The present invention can adjust DC-DC conversion circuit output voltage size according to different output size of current.And the present invention is not
It will affect output voltage when impedance very little of the feedback point to point of use, output voltage when for impedance very little can will hinder
Anti- to be set as 0, feedback point voltage VFB is final feedback voltage V FB_final at this time.
Technical solution of the present invention can be adapted for all large driven current densities, to make up pressure drop caused by useless line loss,
Guarantee the normal work of the various driving circuits of display panel.
To sum up, the feedback method and feed circuit of DC-DC conversion circuit of the present invention, can make up for it DC-DC in display panel
Pressure drop caused by useless line loss when conversion circuit output voltage guarantees the normal work of the various driving circuits of display panel.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the appended right of the present invention
It is required that protection scope.
Claims (10)
1. a kind of feedback method of DC-DC conversion circuit characterized by comprising
Step 10 is previously obtained the feedback point of DC-DC conversion circuit output voltage to the impedance of point of use；DC-DC conversion circuit
Voltage output end via cabling to the voltage input end output voltage of chip, the feedback point is on cabling in closing on DC-
The position of the voltage output end of DC conversion circuit, position of the point of use in the voltage input end for closing on chip on cabling
It sets；
The output electric current that step 20, detecting DC-DC conversion circuit are exported to chip；
Step 30, according to output electric current and impedance, calculate the voltage deviation between the feedback point and the point of use；
Feedback point voltage is subtracted the voltage deviation by step 40, obtains final feedback voltage.
2. the feedback method of DC-DC conversion circuit as described in claim 1, which is characterized in that further include: step 50, basis
Final feedback voltage adjusts the output voltage of DC-DC conversion circuit.
3. the feedback method of DC-DC conversion circuit as claimed in claim 2, such as final feedback voltage are greater than preset value,
Then reduce the output voltage of DC-DC conversion circuit；If the final feedback voltage is less than preset value, then DC-DC conversion electricity is improved
The output voltage on road.
4. the feedback method of DC-DC conversion circuit as described in claim 1, which is characterized in that the impedance passes through cabling cloth
Office is calculated；Alternatively, the impedance is measured by multimeter actual amount.
5. a kind of feed circuit of DC-DC conversion circuit characterized by comprising
Impedance module provides the feedback point for the DC-DC conversion circuit output voltage being previously obtained to the impedance of point of use；DC-DC
Via cabling to the voltage input end output voltage of chip, the feedback point is in the voltage output end of conversion circuit on cabling
The position of the voltage output end of DC-DC conversion circuit is closed on, the point of use is on cabling in the voltage input for closing on chip
The position at end；
Export current detecting module, the output electric current exported for detecting DC-DC conversion circuit to chip；
Offset computing module, for calculating between the feedback point and the point of use according to the output electric current and impedance
Voltage deviation；
Final feedback voltage computing module obtains final feedback voltage for feedback point voltage to be subtracted the voltage deviation.
6. the feed circuit of DC-DC conversion circuit as claimed in claim 5, which is characterized in that the impedance passes through multimeter
Actual amount measures.
7. the feed circuit of DC-DC conversion circuit as claimed in claim 5, which is characterized in that the impedance passes through cabling cloth
Office is calculated.
8. the feed circuit of DC-DC conversion circuit as claimed in claim 5, which is characterized in that the offset computing module
For multiplier, first input end input and output electric current, the second input terminal connects the impedance, and output end exports feedback point
Voltage deviation.
9. the feed circuit of DC-DC conversion circuit as claimed in claim 5, which is characterized in that the final feedback voltage meter
Calculation module is subtracter, and the voltage deviation of inverting input terminal input feedback point, non-inverting input terminal input feedback point voltage is defeated
Outlet exports final feedback voltage.
10. the feed circuit of DC-DC conversion circuit as claimed in claim 5, which is characterized in that further include feedback control mould
Block, for carrying out feedback control to DC-DC conversion circuit according to final feedback voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785450.4A CN109004822A (en) | 2018-07-17 | 2018-07-17 | The feedback method and feed circuit of DC-DC conversion circuit |
| PCT/CN2018/115791 WO2020015261A1 (en) | 2018-07-17 | 2018-11-16 | Feedback method for dc-dc conversion circuit, and feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785450.4A CN109004822A (en) | 2018-07-17 | 2018-07-17 | The feedback method and feed circuit of DC-DC conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109004822A true CN109004822A (en) | 2018-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810785450.4A Pending CN109004822A (en) | 2018-07-17 | 2018-07-17 | The feedback method and feed circuit of DC-DC conversion circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109004822A (en) |
| WO (1) | WO2020015261A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803562B (en) * | 2021-01-29 | 2024-04-26 | 泉州市贝瓦电子技术有限公司 | Power supply charging device capable of regulating voltage and current in wide range |
| CN113258770B (en) * | 2021-07-07 | 2021-10-08 | 上海芯龙半导体技术股份有限公司 | Line loss compensation module, switching power supply chip and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN101980096A (en) * | 2010-10-13 | 2011-02-23 | 北京星网锐捷网络技术有限公司 | Power supply compensation method and power supply compensation circuit |
| CN106160472A (en) * | 2016-08-11 | 2016-11-23 | 深圳欧创芯半导体有限公司 | Line loss compensation method and device for electric pressure converter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013085382A (en) * | 2011-10-11 | 2013-05-09 | Ricoh Co Ltd | Switching regulator and method of controlling the same |
| CN104393759B (en) * | 2014-12-11 | 2017-04-12 | 无锡新硅微电子有限公司 | DC-DC (direct current-direct current) converter with line loss compensation function |
-
2018
- 2018-07-17 CN CN201810785450.4A patent/CN109004822A/en active Pending
- 2018-11-16 WO PCT/CN2018/115791 patent/WO2020015261A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN101980096A (en) * | 2010-10-13 | 2011-02-23 | 北京星网锐捷网络技术有限公司 | Power supply compensation method and power supply compensation circuit |
| CN106160472A (en) * | 2016-08-11 | 2016-11-23 | 深圳欧创芯半导体有限公司 | Line loss compensation method and device for electric pressure converter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020015261A1 (en) | 2020-01-23 |
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Application publication date: 20181214 |