CN107947537A - The line loss compensation circuit of Switching Power Supply - Google Patents
The line loss compensation circuit of Switching Power Supply Download PDFInfo
- Publication number
- CN107947537A CN107947537A CN201711423012.5A CN201711423012A CN107947537A CN 107947537 A CN107947537 A CN 107947537A CN 201711423012 A CN201711423012 A CN 201711423012A CN 107947537 A CN107947537 A CN 107947537A
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- Prior art keywords
- voltage
- power supply
- switching power
- resistance
- electrically connected
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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 for the duty cycle for obtaining high level in the corresponding feedback voltage in one end for detecting the second resistance and the feedback voltage, and exports detection voltage；The filter module is used to be filtered processing to the detection voltage, and exports the filtering voltage for following the detection voltage change；The transconductance modulator is used to the filtering voltage is converted into adjusting electric current and be exported.The present invention realizes the situation that when reducing the output current moment of Switching Power Supply, will not cause false triggering overvoltage protection；When the output current moment rise of Switching Power Supply, it can in time be responded, 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, more particularly to a kind of line loss compensation circuit of Switching Power Supply.
Background technology
In the prior art, for the Switching Power Supply of primary side feedback, generally output is 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 current
Drop, increase compensation electric current, is then superimposed a voltage deviation in output voltage test side, makes Isobarically Control loop control system
Actual output voltage declines.
But for traditional line loss compensation circuit, if the response speed of line loss compensation circuit is too fast, switch can be disturbed
The normal work of power supply, especially when the less situation of the output current of Switching Power Supply, be easy to cause the false triggering of Switching Power Supply
The situation of output over-voltage protection；On the contrary, if the response speed of line loss compensation circuit is excessively slow, the response of Switching Power Supply can be reduced
Speed, especially in the output current moment increase of Switching Power Supply, can not realize and timely respond to.Therefore, existing line loss compensation
Circuit cannot increasingly meet the needs of user.
The content of the invention
The technical problem to be solved in the present invention is in order to overcome the line loss compensation circuit of Switching Power Supply in the prior art exist
When response speed is too fast, the situation of the false triggering output over-voltage protection of Switching Power Supply is be easy to cause, when response speed is excessively slow, is held
The defects of timely responding to can not be realized, and it is an object of the present invention to provide a kind of line loss compensation circuit of Switching Power Supply by easily causing 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
Ripple 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
The one end for stating second resistance is electrically connected；The other end ground connection of the second resistance；
The one end of the output terminal of the input terminal of the detection module and the transconductance modulator with the second resistance is electrically connected
Connect；
The detection module is used to obtain the corresponding feedback voltage in one end for detecting the second resistance and the feedback electricity
The duty cycle of high level in pressure, and export detection voltage；
The detection voltage declines with the increase of the duty cycle of high level in the feedback voltage；
The filter module is used to be filtered processing to the detection voltage, and exports and follow 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 less than the filtering voltage, the filtering voltage follows the detection
The speed of voltage change is more than the second given threshold；
Second given threshold is more than first given threshold；The transconductance modulator is used to turn the filtering voltage
Change into and adjust electric current and export.
It is preferred that the filter module includes 3rd resistor and capacitance；
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 capacitance is electrically connected with the other end of the 3rd resistor, the other end ground connection of the capacitance；
The resistance value of the 3rd resistor cause when it is described detection voltage be higher than the filtering voltage when, the filtering voltage
The rate of climb reduces.
It is preferred that 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 cause when it is described detection voltage be less than the filtering voltage when, the filtering voltage
Decrease speed improves.
It is preferred that the resistance value of the 4th resistance is 3-5 times high described in the resistance value ratio of the 3rd resistor.
It is preferred that the in-phase input end of the transconductance modulator is with the other end of the 3rd resistor with being electrically connected, it is anti-phase defeated
Enter end ground connection, output terminal is electrically connected with the output terminal of the Switching Power Supply.
The positive effect of the present invention is：
The present invention is by detection module, the duty cycle of high level in the feedback voltage and feedback voltage of detection switch power supply,
The amplitude information of the output current of Switching Power Supply is obtained, and converts thereof into detection voltage, by filter module to detecting voltage
Processing is filtered, obtains filtering voltage, then filtering voltage is converted into adjusting electric current by transconductance modulator；Wherein, mould is filtered
Block includes 3rd resistor, capacitance, the 4th resistance and diode, realizes when the output current moment reduction of Switching Power Supply, will not
Cause the situation of false triggering overvoltage protection；When the output current moment rise of Switching Power Supply, can be responded in time, so that
The dynamic response performance of Switching Power Supply is improved, meets the needs of user.
Brief description of the drawings
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.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
Apply among a scope.
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 terminal of the transconductance modulator 3 with the second resistance R2
It is electrically connected；The detection module 1 is used to obtaining the corresponding feedback voltage V FB in one end that detects the second resistance R2 and described anti-
The duty cycle 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 cycle of high level in VFB and decline.
Wherein, the magnitude of voltage of the feedback voltage V FB is equal with the magnitude of voltage 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 load, transformation
The auxiliary winding of device produces the input voltage VAUX with load voltage equal proportion, by first resistor R1 and second resistance R2 partial pressures
Produce feedback voltage V FB afterwards, the line loss compensation circuit of the Switching Power Supply of the present embodiment is according to the value adjusting switch of feedback voltage V FB
Output current of the power supply after line loss compensation.Wherein, the duty cycle reflection Switching Power Supply of the high level in feedback voltage V FB is defeated
Go out the amplitude information of electric current.
By the duty cycle 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 cycle 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
Once, the frequency is identical with the working frequency of line loss compensation circuit, it is necessary to be carried out to the detection voltage Vdet of acquisition for renewal
Filtering process, concussion is produced to avoid Switching Power Supply.
The filter module 2 is used to be filtered the detection voltage Vdet processing, and exports with the detection electricity
Press the filtering voltage Vf of Vdet changes.
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 filtering voltage Vf follows the speed of the detection voltage Vdet changes to be less than first
Given threshold, i.e., described filtering voltage Vf follow the speed of the detection voltage Vdet changes slower；
When the detection voltage Vdet is less than the filtering voltage Vf, the filtering voltage Vf follows the detection voltage
The speed of Vdet changes is more than the second given threshold, i.e., described filtering voltage Vf follows the speed of the detection voltage Vdet changes
Comparatively fast.
Second given threshold is more than first given threshold.
The filter module 2 includes 3rd resistor R3, capacitance 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
Transconductance modulator 3 is stated to be electrically connected；One end of the capacitance C1 is electrically connected with the other end of the 3rd resistor R3, the capacitance C1's
The other end is grounded；
Wherein, the 3rd resistor R3 causes for when the detection voltage Vdet is higher than the filtering voltage Vf, 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
Connect；
The 4th resistance R4 causes when the detection voltage Vdet is less than the filtering voltage Vf, the filtering voltage
The decrease speed of Vf improves.
Specifically, when the detection voltage Vdet is after 2 filtering process of filter module, will obtain slowly varying
The filtering voltage Vf, then be converted into adjusting electric current and export by transconductance modulator 3, flow through the second resistance R2 of Switching Power Supply
Afterwards, a voltage deviation is produced on feedback voltage V FB.The output current of Switching Power Supply is bigger, then high in feedback voltage V FB
The duty cycle 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 reduce, flow through second resistance R2 generation voltage deviation it is then smaller, line loss compensation circuit actual output voltage is then higher.
When the output current of Switching Power Supply is to during small saltus step, then detection voltage Vdet is higher than filtering voltage Vf, two poles greatly
Pipe D1 will end；Wherein, the time constant of filter module 2 is determined by 3rd resistor R3 and capacitance C1.The resistance value of 3rd resistor R3
It is designed to larger, for reducing the rate of climb of filtering voltage Vf, so as to prevent feedback voltage V FB from undergoing mutation, avoids false touch
Send out the situation of overvoltage protection.
When the output current of Switching Power Supply is from small to during big saltus step, then detection voltage Vdet is less than filtering voltage Vf, two poles
Pipe D1 is turned on；The time constant of filter module 2 is determined by the 4th resistance R4 and capacitance C1.The resistance value of 4th resistance R4 be designed to compared with
It is small, for improving the decrease speed of filtering voltage Vf, so that feedback voltage V FB can be quickly adjusted in place, so as to improve and be
System response speed.
The resistance value of the 4th resistance R4 is 3-5 times high described in the resistance value ratio of the 3rd resistor R3.
The transconductance modulator 3 is used to the filtering voltage Vf is converted into adjusting electric current and be exported.
Specifically, the in-phase input end of the transconductance modulator 3 is anti-phase with the other end of the 3rd resistor R3 with being electrically connected
Input end grounding, output terminal are electrically connected with the output terminal of the Switching Power Supply.
The present embodiment is by detection module 1, and the duty cycle of high level, is switched in the output voltage of detection switch power supply
The amplitude information of the output current of power supply, and detection voltage Vdet is converted thereof into, by filter module 2 to detecting voltage Vdet
Processing is filtered, obtains filtering voltage Vf, then filtering voltage Vf is converted into adjusting electric current by transconductance modulator 3；Wherein, filter
Ripple module 2 includes 3rd resistor R3, capacitance C1, the 4th resistance R4 and diode D1, realizes the output current wink when Switching Power Supply
Between when reducing, the situation of false triggering overvoltage protection will not be caused；, can be timely when the output current moment rise of Switching Power Supply
Responded, so as to improve the dynamic response performance of Switching Power Supply, meet the needs of user.
Although the foregoing describing the embodiment of the present invention, 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
On the premise of from the principle of the present invention and essence, various changes or modifications can be made to these embodiments, but these are changed
Protection scope of the present invention is each fallen within modification.
Claims (5)
1. a kind of line loss compensation circuit of Switching Power Supply, it is characterised 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 ground connection of the second resistance；
The one end of the output terminal of the input terminal of the detection module and the transconductance modulator with the second resistance is electrically connected；
The detection module is used to obtain in the corresponding feedback voltage in one end and the feedback voltage that detect the second resistance
The duty cycle of high level, and export detection voltage；
The detection voltage declines with the increase of the duty cycle of high level in the feedback voltage；
The filter module is used to be filtered processing to the detection voltage, and exports the filter for following the detection voltage change
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 less than the filtering voltage, the filtering voltage follows the detection voltage
The speed of change is more than the second given threshold；
Second given threshold is more than first given threshold；
The transconductance modulator is used to the filtering voltage is converted into adjusting electric current and be exported.
2. the line loss compensation circuit of Switching Power Supply as claimed in claim 1, it is characterised in that the filter module includes the 3rd
Resistance and capacitance；
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 capacitance；
The resistance value of the 3rd resistor cause when it is described detection voltage be higher than the filtering voltage when, the rising of the filtering voltage
Speed reduces.
3. the line loss compensation circuit of Switching Power Supply as claimed in claim 2, it is characterised 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 cause when it is described detection voltage be less than the filtering voltage when, the decline of the filtering voltage
Speed improves.
4. the line loss compensation circuit of Switching Power Supply as claimed in claim 3, it is characterised 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, it is characterised in that the transconductance modulator it is same mutually defeated
Enter end with the other end of the 3rd resistor with being electrically connected, reverse inter-input-ing ending grounding, the output of output terminal and the Switching Power Supply
End is electrically connected.
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 true CN107947537A (en) | 2018-04-20 |
| CN107947537B 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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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153114A1 (en) * | 2007-12-12 | 2009-06-18 | Upi Semiconductor Corporation | DC-DC converters with transient response control |
| US20100164443A1 (en) * | 2008-12-31 | 2010-07-01 | Stmicroelectronics S.R.L. | Method for controlling a switching regulator and related switching regulator |
| CN101860243A (en) * | 2010-05-14 | 2010-10-13 | 西安英洛华微电子有限公司 | Line loss compensation circuit for switch power supply |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 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 |
-
2017
- 2017-12-25 CN CN201711423012.5A patent/CN107947537B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153114A1 (en) * | 2007-12-12 | 2009-06-18 | Upi Semiconductor Corporation | DC-DC converters with transient response control |
| US20100164443A1 (en) * | 2008-12-31 | 2010-07-01 | Stmicroelectronics S.R.L. | Method for controlling a switching regulator and related switching regulator |
| CN101860243A (en) * | 2010-05-14 | 2010-10-13 | 西安英洛华微电子有限公司 | Line loss compensation circuit for switch power supply |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 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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| Publication number | Publication date |
|---|---|
| CN107947537B (en) | 2019-10-22 |
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