CN107947537B - The line loss compensation circuit of Switching Power Supply - Google Patents
The line loss compensation circuit of Switching Power Supply Download PDFInfo
- Publication number
- CN107947537B CN107947537B CN201711423012.5A CN201711423012A CN107947537B CN 107947537 B CN107947537 B CN 107947537B CN 201711423012 A CN201711423012 A CN 201711423012A CN 107947537 B CN107947537 B CN 107947537B
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- Prior art keywords
- voltage
- power supply
- switching power
- resistance
- detection
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
-
- 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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
Abstract
The invention discloses a kind of line loss compensation circuit of Switching Power Supply, the line loss compensation circuit includes detection module, filter module and transconductance modulator；The Switching Power Supply includes first resistor and second resistance；The detection module is used to obtain the duty ratio of high level in the corresponding feedback voltage in one end and the feedback voltage for detect the second resistance, and exports detection voltage；The filter module exports the filtering voltage for following the detection voltage change for being filtered to the detection voltage；The transconductance modulator is used to be converted into the filtering voltage to adjust electric current and exports.The case where present invention realizes when reducing the output electric current moment of Switching Power Supply, not will cause false triggering overvoltage protection；When increasing the output electric current moment of Switching Power Supply, it can be responded in time, so as to improve the dynamic response performance of Switching Power Supply, meet the needs of user.
Description
Technical field
The present invention relates to switch power technology field, in particular to a kind of line loss compensation circuit of Switching Power Supply.
Background technique
In the prior art, for the Switching Power Supply of primary side feedback, output is generally compensated by using line loss compensation circuit
Problem of pressure drop on cable, by exporting compensation electric current in the output voltage test side of Switching Power Supply, according under output electric current
Drop increases compensation electric current, is then superimposed a voltage deviation in output voltage test side, makes Isobarically Control loop control system
Actual output voltage decline.
But for traditional line loss compensation circuit, if the response speed of line loss compensation circuit is too fast, switch can be interfered
The normal work of power supply be easy to cause the false triggering of Switching Power Supply especially when the lesser situation of the output electric current of Switching Power Supply
The case where output over-voltage protection；On the contrary, the response of Switching Power Supply can be reduced if the response speed of line loss compensation circuit is excessively slow
Speed cannot achieve and timely respond to especially when increasing the output electric current moment of Switching Power Supply.Therefore, existing line loss compensation
Circuit has not been able to satisfy the needs of user more and more.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome the line loss compensation circuit of Switching Power Supply in the prior art to exist
When response speed is too fast, the case where be easy to causeing the false triggering output over-voltage protection of Switching Power Supply, holds when response speed is excessively slow
Switching Power Supply is easily caused to cannot achieve the defect timely responded to, and it is an object of the present invention to provide a kind of line loss compensation circuit of Switching Power Supply.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The present invention provides a kind of line loss compensation circuit of Switching Power Supply, and the line loss compensation circuit includes detection module, filter
Wave module and transconductance modulator；
The detection module, the filter module and the transconductance modulator are sequentially connected electrically；
The Switching Power Supply includes first resistor and second resistance；
One end of the first resistor is electrically connected with the auxiliary winding side of the transformer of the Switching Power Supply, the other end and institute
State one end electrical connection of second resistance；The other end of the second resistance is grounded；
The one end of the output end of the input terminal of the detection module and the transconductance modulator with the second resistance is electrically connected
It connects；
The detection module is for obtaining the corresponding feedback voltage in one end for detecting the second resistance and feedback electricity
The duty ratio of high level in pressure, and export detection voltage；
The detection voltage declines with the increase of the duty ratio of high level in the feedback voltage；
The filter module exports for being filtered to the detection voltage and follows the detection voltage change
Filtering voltage；
When the detection voltage is higher than the filtering voltage, the filtering voltage follows the speed of the detection voltage change
Degree is less than the first given threshold；When the detection voltage is lower than the filtering voltage, the filtering voltage follows the detection
The speed of voltage change is greater than the second given threshold；
Second given threshold is greater than first given threshold；The transconductance modulator is used to turn the filtering voltage
It changes into and adjusts electric current and export.
Preferably, the filter module includes 3rd resistor and capacitor；
One end of the 3rd resistor is electrically connected with the detection module, and the other end is electrically connected with the transconductance modulator；Institute
The one end for stating capacitor is electrically connected with the other end of the 3rd resistor, the other end ground connection of the capacitor；
The resistance value of the 3rd resistor makes when the detection voltage is higher than the filtering voltage, the filtering voltage
The rate of climb reduces.
Preferably, the filter module further includes the 4th resistance and diode；
One end of 4th resistance is electrically connected with the other end of the 3rd resistor, the other end of the 4th resistance with
The anode of the diode is electrically connected；The cathode of the diode is electrically connected with one end of the 3rd resistor；
The resistance value of 4th resistance makes when the detection voltage is lower than the filtering voltage, the filtering voltage
Decrease speed improves.
Preferably, the resistance value of the 4th resistance described in the resistance value ratio of the 3rd resistor is 3-5 times high.
Preferably, the non-inverting input terminal of the transconductance modulator and the other end of the 3rd resistor be electrically connected, reverse phase is defeated
Enter end ground connection, output end is electrically connected with the output end of the Switching Power Supply.
The positive effect of the present invention is that:
The present invention passes through detection module, the duty ratio of high level in the feedback voltage and feedback voltage of detection switch power supply,
The amplitude information of the output electric current of Switching Power Supply is obtained, and converts thereof into detection voltage, by filter module to detection voltage
It is filtered, obtains filtering voltage, be converted into filtering voltage using transconductance modulator to adjust electric current；Wherein, mould is filtered
Block includes 3rd resistor, capacitor, the 4th resistance and diode, is realized when reducing the output electric current moment of Switching Power Supply, will not
The case where causing false triggering overvoltage protection；When increasing the output electric current moment of Switching Power Supply, can be responded in time, thus
The dynamic response performance for improving Switching Power Supply meets the needs of user.
Detailed description of the invention
Fig. 1 is the module diagram of the line loss compensation circuit of the Switching Power Supply of present pre-ferred embodiments；
Fig. 2 is the circuit diagram of the line loss compensation circuit of the Switching Power Supply of present pre-ferred embodiments.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
As shown in Figure 1, the line loss compensation circuit of the Switching Power Supply of the present embodiment include detection module 1, filter module 2 and across
Guide module 3.
As shown in Fig. 2, the detection module 1, the filter module 2 and the transconductance modulator 3 are sequentially connected electrically.
The Switching Power Supply includes first resistor R1 and second resistance R2；One end of the first resistor R1 and the switch
The auxiliary winding side of the transformer of power supply is electrically connected, and the other end is electrically connected with one end of the second resistance R2；Second electricity
Hinder the other end ground connection of R2；
The one end of the input terminal of the detection module 1 and the output end of the transconductance modulator 3 with the second resistance R2
Electrical connection；The detection module 1 for obtains the corresponding feedback voltage V FB in one end for detecting the second resistance R2 and it is described instead
The duty ratio of high level in feedthrough voltage VFB, and export detection voltage Vdet；The detection voltage Vdet is with the feedback voltage
The increase of the duty ratio of high level in VFB and decline.
Wherein, the voltage value of the feedback voltage V FB is equal with the voltage value of the output voltage of the Switching Power Supply.
Specifically, as shown in Fig. 2, when the transformer secondary winding in the Switching Power Supply discharges to load, transformation
The auxiliary winding of device generates the input voltage VAUX with load voltage equal proportion, divides by first resistor R1 and second resistance R2
Generate feedback voltage V FB afterwards, the line loss compensation circuit of the Switching Power Supply of the present embodiment is according to the value regulating switch of feedback voltage V FB
Output electric current of the power supply after line loss compensation.Wherein, the duty ratio reflection Switching Power Supply of the high level in feedback voltage V FB is defeated
The amplitude information of electric current out.
By the duty ratio of the high level in the detection module 1 detection feedback voltage V FB, Switching Power Supply output electricity is obtained
The amplitude information of stream, and convert thereof into the detection voltage Vdet.Wherein, the duty ratio of the high level in feedback voltage V FB
Information updates once in each switch periods of Switching Power Supply, and therefore, the detection voltage Vdet is also in each switch periods
It updates once, the frequency is identical as the working frequency of line loss compensation circuit, needs to carry out the detection voltage Vdet of acquisition
Filtering processing generates concussion to avoid Switching Power Supply.
The filter module 2 is exported for being filtered to the detection voltage Vdet with the detection electricity
Press the filtering voltage Vf of Vdet variation.
Wherein, the filtering voltage Vf with the detection voltage Vdet it is slowly varying.Specifically, when the detection voltage
When Vdet is higher than the filtering voltage Vf, the speed that the filtering voltage Vf follows the detection voltage Vdet to change is less than first
Given threshold, i.e., the speed that the described filtering voltage Vf follows the detection voltage Vdet to change are slower；
When the detection voltage Vdet is lower than the filtering voltage Vf, the filtering voltage Vf follows the detection voltage
The speed of Vdet variation is greater than the second given threshold, i.e., the speed that the described filtering voltage Vf follows the detection voltage Vdet to change
Comparatively fast.
Second given threshold is greater than first given threshold.
The filter module 2 includes 3rd resistor R3, capacitor C1, the 4th resistance R4 and diode D1；
One end of the 3rd resistor R3 is electrically connected with the detection module 1, the other end of the 3rd resistor R3 and institute
State the electrical connection of transconductance modulator 3；One end of the capacitor C1 is electrically connected with the other end of the 3rd resistor R3, the capacitor C1's
Other end ground connection；
Wherein, the 3rd resistor R3 make for when the detection voltage Vdet be higher than the filtering voltage Vf when, it is described
The rate of climb of filtering voltage Vf reduces.
One end of the 4th resistance R4 is electrically connected with the other end of the 3rd resistor R3, the 4th resistance R4's
The other end is electrically connected with the anode of the diode D1；The cathode of the two pole D1 and one end of the 3rd resistor R3 are electrically connected
It connects；
The 4th resistance R4 makes when the detection voltage Vdet is lower than the filtering voltage Vf, the filtering voltage
The decrease speed of Vf improves.
Specifically, when the detection voltage Vdet by the filter module 2 filtering processing after, will obtain slowly varying
The filtering voltage Vf is converted into adjusting electric current and export, flows through the second resistance R2 of Switching Power Supply using transconductance modulator 3
Afterwards, a voltage deviation is generated on feedback voltage V FB.The output electric current of Switching Power Supply is bigger, then high in feedback voltage V FB
The duty ratio of level is bigger, and the detection voltage Vdet is then lower, and the filtering voltage Vf is then slowly reduced, and adjusts electric current therewith
Also it reduces, the voltage deviation for flowing through second resistance R2 generation is then smaller, and line loss compensation circuit actual output voltage is then higher.
When the output electric current of Switching Power Supply is from greatly to when small jump, then detecting voltage Vdet higher than filtering voltage Vf, two poles
Pipe D1 will end；Wherein, the time constant of filter module 2 is determined by 3rd resistor R3 and capacitor C1.The resistance value of 3rd resistor R3
It is designed larger, for reducing the rate of climb of filtering voltage Vf, to prevent feedback voltage V FB from mutating, avoids accidentally touching
The case where sending out overvoltage protection.
When the output electric current of Switching Power Supply is from small to when big jump, then voltage Vdet is detected lower than filtering voltage Vf, two poles
Pipe D1 conducting；The time constant of filter module 2 is determined by the 4th resistance R4 and capacitor C1.The resistance value of 4th resistance R4 be designed compared with
It is small, for improving the decrease speed of filtering voltage Vf, so that feedback voltage V FB be enable quickly to be adjusted in place, to improve and be
System response speed.
The resistance value of 4th resistance R4 described in the resistance value ratio of the 3rd resistor R3 is 3-5 times high.
The transconductance modulator 3 is used to be converted into the filtering voltage Vf to adjust electric current and exports.
Specifically, the non-inverting input terminal of the transconductance modulator 3 and the other end of the 3rd resistor R3 be electrically connected, reverse phase
Input end grounding, output end are electrically connected with the output end of the Switching Power Supply.
The present embodiment passes through detection module 1, and the duty ratio of high level, is switched in the output voltage of detection switch power supply
The amplitude information of the output electric current of power supply, and detection voltage Vdet is converted thereof into, pass through 2 couples of detection voltage Vdet of filter module
It is filtered, obtains filtering voltage Vf, be converted into filtering voltage Vf using transconductance modulator 3 to adjust electric current；Wherein, it filters
Wave module 2 includes 3rd resistor R3, capacitor C1, the 4th resistance R4 and diode D1, realizes the output electric current wink for working as Switching Power Supply
Between when reducing, the case where not will cause false triggering overvoltage protection；It, can be timely when increasing the output electric current moment of Switching Power Supply
It is responded, so as to improve the dynamic response performance of Switching Power Supply, meets the needs of user.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, various changes or modifications can be made to these embodiments, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (5)
1. a kind of line loss compensation circuit of Switching Power Supply, which is characterized in that the line loss compensation circuit includes detection module, filtering
Module and transconductance modulator；
The detection module, the filter module and the transconductance modulator are sequentially connected electrically；
The Switching Power Supply includes first resistor and second resistance；
One end of the first resistor is electrically connected with the auxiliary winding side of the transformer of the Switching Power Supply, the other end and described the
One end of two resistance is electrically connected；The other end of the second resistance is grounded；
The output end of the input terminal of the detection module and the transconductance modulator is electrically connected with one end of the second resistance；
The detection module is used to detect high electricity in the corresponding feedback voltage in one end and the feedback voltage of the second resistance
Flat duty ratio, and export detection voltage；
The detection voltage declines with the increase of the duty ratio of high level in the feedback voltage；
The filter module exports the filter for following the detection voltage change for being filtered to the detection voltage
Wave voltage；
When the detection voltage is higher than the filtering voltage, the filtering voltage follows the speed of the detection voltage change small
In the first given threshold；When the detection voltage is lower than the filtering voltage, the filtering voltage follows the detection voltage
The speed of variation is greater than the second given threshold；
Second given threshold is greater than first given threshold；
The transconductance modulator is used to be converted into the filtering voltage to adjust electric current and exports.
2. the line loss compensation circuit of Switching Power Supply as described in claim 1, which is characterized in that the filter module includes third
Resistance and capacitor；
One end of the 3rd resistor is electrically connected with the detection module, and the other end is electrically connected with the transconductance modulator；The electricity
One end of appearance is electrically connected with the other end of the 3rd resistor, the other end ground connection of the capacitor；
The resistance value of the 3rd resistor makes the rising of the filtering voltage when the detection voltage is higher than the filtering voltage
Speed reduces.
3. the line loss compensation circuit of Switching Power Supply as claimed in claim 2, which is characterized in that the filter module further includes
Four resistance and diode；
One end of 4th resistance is electrically connected with the other end of the 3rd resistor, the other end of the 4th resistance with it is described
The anode of diode is electrically connected；The cathode of the diode is electrically connected with one end of the 3rd resistor；
The resistance value of 4th resistance makes the decline of the filtering voltage when the detection voltage is lower than the filtering voltage
Speed improves.
4. the line loss compensation circuit of Switching Power Supply as claimed in claim 3, which is characterized in that the resistance value ratio of the 3rd resistor
The resistance value of 4th resistance is 3-5 times high.
5. the line loss compensation circuit of Switching Power Supply as claimed in claim 2, which is characterized in that the transconductance modulator it is same mutually defeated
Enter end to be electrically connected with the other end of the 3rd resistor, reverse inter-input-ing ending grounding, the output end of output end and the Switching Power Supply
Electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711423012.5A CN107947537B (en) | 2017-12-25 | 2017-12-25 | The line loss compensation circuit of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711423012.5A CN107947537B (en) | 2017-12-25 | 2017-12-25 | The line loss compensation circuit of Switching Power Supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107947537A CN107947537A (en) | 2018-04-20 |
| CN107947537B true CN107947537B (en) | 2019-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711423012.5A Active CN107947537B (en) | 2017-12-25 | 2017-12-25 | The line loss compensation circuit of Switching Power Supply |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7923977B2 (en) * | 2007-12-12 | 2011-04-12 | Upi Semiconductor Corporation | DC-DC converters with transient response control |
| US8179699B2 (en) * | 2008-12-31 | 2012-05-15 | Stmicroelectronics S.R.L. | Method for controlling a switching regulator and related switching regulator |
| CN101860243B (en) * | 2010-05-14 | 2012-12-19 | 西安英洛华微电子有限公司 | Line loss compensation circuit for switch power supply |
| CN102832806B (en) * | 2012-09-14 | 2015-02-25 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
| CN206099765U (en) * | 2016-06-29 | 2017-04-12 | 深圳市富满电子集团股份有限公司 | Adjustable constant voltage power supply's line loss compensating circuit and power adapter |
| CN107482909A (en) * | 2017-07-28 | 2017-12-15 | 惠州市德赛西威汽车电子股份有限公司 | A kind of line loss compensation circuit of power supply |
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2017
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| CN107947537A (en) | 2018-04-20 |
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