CN208401739U - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
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- CN208401739U CN208401739U CN201820682945.XU CN201820682945U CN208401739U CN 208401739 U CN208401739 U CN 208401739U CN 201820682945 U CN201820682945 U CN 201820682945U CN 208401739 U CN208401739 U CN 208401739U
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Abstract
The utility model provides a kind of quick pressure stabilizing implementation method of Switching Power Supply: according to feedback voltage VFBWith Switching Power Supply internal reference voltage VREFGenerate error amplification signal VCOMP；Feedback voltage VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal VADD；Compare the VCOMPWith VADDSize controls the on-off of main switch；Compare the VCOMPWith VADD, judge the working condition of Switching Power Supply；When judging Switching Power Supply for steady state operating conditions, the turn-on time of main switch and minimum turn-off time are constant；When judging Switching Power Supply in load current step, i.e. VCOMPGreater than VADD, when being dynamic behavior, the turn-on time of main switch increases, and the minimum turn-off time reduces, and then accelerates dynamic corresponding speed, realizes quick pressure stabilizing.The utility model additionally provides a kind of Switching Power Supply using the above method, and judgment module and adjustment module is added, and can determine whether the working condition of Switching Power Supply, and then adjusts make-and-break time and the reduction of minimum turn-off time of main switch, realizes quick pressure stabilizing.
Description
Technical field
The utility model relates to Switching Power Supply voltage stabilizing technique field more particularly to a kind of Switching Power Supplies.
Background technique
With the rapid development of electronic technology, power technology also obtains unprecedented progress.Switching Power Supply with small-sized, light weight and
Efficient feature is widely used among each class of electronic devices.
The control mode of Switching Power Supply can be divided into fixed-frequency control and frequency control.In traditional frequency control mode, master is opened
The turn-on time of pass is fixed, and the turn-off time changes as output voltage and load change, compared to fixed-frequency control mode, frequency conversion
Control model withouts waiting for the arrival of next cycle in load current step, when output voltage variation, can pass through shortening
Turn-off time quickly opens next cycle, therefore response speed is relatively faster.But with the development of technology, traditional frequency conversion
The response speed of control model can no longer meet demand, have to be hoisted.
Utility model content
The utility model, can in order to solve the above technical problems, provide a kind of quick pressure stabilizing implementation method of Switching Power Supply
To shorten the turn-on time of main switch, this method comprises:
Switching Power Supply is equipped with feed circuit, obtains feedback voltage VFB, according to feedback voltage VFBWith Switching Power Supply internal reference
Voltage VREFGenerate error amplification signal VCOMP；
Feedback voltage VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal VADD；
Compare the VCOMPWith VADDSize controls the on-off of main switch；
Compare the VCOMPWith VADD, judge the working condition of Switching Power Supply；When judging Switching Power Supply for steady state operating conditions
When, the turn-on time of main switch and minimum turn-off time are constant；When judging Switching Power Supply in load current step, i.e. VCOMPGreater than VADD,
When for dynamic behavior, the turn-on time of main switch increases, and the minimum turn-off time reduces, and then accelerates dynamic corresponding speed,
Realize quick pressure stabilizing.
The utility model additionally provides a kind of Switching Power Supply using the above method, and Switching Power Supply provides output electricity for load
Press VOUT, Switching Power Supply includes feedback module, comparison module, drive module, turn-on time control module, the control of minimum turn-off time
Molding block, judgment module and adjustment module.
The feedback module obtains feedback voltage VFB, according to VFBWith Switching Power Supply internal reference voltage VREFError is generated to put
Big signal VCOMP, by VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal VADD；
The comparison module VADDAnd VCOMP, determine the on-off of main switch, and send and instruct to drive module；
The on-off of main switch is realized in the instruction that the drive module receives the comparison module；
The turn-on time control module controls the turn-on time of each period main switch；
The minimum turn-off time control module controls the minimum turn-off time of each period main switch；
The judgment module is according to VADDAnd VCOMPJudge the working condition of each cycle switch power supply；
The adjustment module accordingly adjusts turn-on time and minimum turn-off time according to above-mentioned judgment module judging result；When
The VOUTWhen for stable state, the adjustment module does not work；As the VOUTWhen for step state, i.e. VCOMPGreater than VADD, institute
It states adjustment module and controls the turn-on time control module increase turn-on time, and control the minimum turn-off time control and reduce
The minimum turn-off time shortens the time of a cycle, accelerate dynamic responding speed, enable Switching Power Supply it is cracking stablize it is defeated
Voltage out.
Further, the feedback module includes error amplifier, ripple generator；The error amplifier is relatively more described
VFBAnd VREF, and V is generated according to the difference of the twoCOMP；The ripple generator export stability triangle wave and with the VFBSuperposition,
Generate VADD, when guaranteeing Switching Power Supply stable state, the VADDGreater than the VCOMP；The comparison module compares including first
Device, the first comparator VCOMPAnd VADD。
Further, the drive module includes logic element and driving circuit.
Further, the turn-on time control module includes and input voltage VINRelevant current source I1, it capacitor C1, opens
Close K1 and the second comparator；Described one end C1 ground connection, the other end connect the I1 and charge, the K1 parallel connection C1, and described the
Two comparators compare the current potential of C1 and preset current potential V1, when the current potential of C1 reaches V1, the turn-on time control module
It controls the drive module and closes main switch, while the K1 is closed, when starting to the next period, K1 is disconnected, and I1 is again to C1
Charging, forms the fixation turn-on time in each period repeatedly.
The minimum turn-off time control module is similar with turn-on time control module, including current source I2, capacitor C2, opens
K2 and third comparator, the one end C2 ground connection are closed, the other end connects the I2 and charges, the K2 parallel connection C2, and described the
Three comparators compare the current potential of C2 and preset current potential V2, when the current potential of C2 reaches V2, the minimum turn-off time control
Module controls the drive module and opens main switch, while the K2 is closed, and when starting to the next period, K2 is disconnected.
Further, the judgment module is sentenced including the 4th comparator, the 4th comparator VCOMPWith
VADD；The adjustment module includes current source I3, current source I4, switch K3, switch K4.
The I3 connects the C1 by K3, and the I3 current direction is opposite with the I1 current direction；The I4 passes through
The K4 connection C2；The direction I4 is identical as the direction I2；4th comparator connects and controls the K3 and K4；When
VCOMPGreater than VADDWhen, the K3 and K4 closure, the I3 offset I1, and the I4 is superimposed I2, and the C1 charging time is elongated, C2 charging
Time shortens, and turn-on time is elongated, and the minimum turn-off time shortens, and accelerates the response speed of control circuit.
From the above description of the utility model, it can be seen, compared to the prior art, the utility model has the advantages that
The application proposes the quick pressure stabilizing implementation method and Switching Power Supply of a kind of Switching Power Supply, by adding in Switching Power Supply
Enter judgment module and adjustment module, can determine whether the working condition of Switching Power Supply, and then the logical of main switch is adjusted by adjustment module
The disconnected time, work as load current step, when Switching Power Supply be in dynamic behavior, the turn-on time increase of main switch, when minimum turn-off
Between reduce, and then accelerate dynamic corresponding speed, realize quick pressure stabilizing.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and constitutes one of the utility model
Point, the exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the utility model
Improper restriction.
Wherein:
Fig. 1 is the circuit diagram of traditional frequency control mode；
Fig. 2 is the quick pressure stabilizing step schematic diagram of the utility model Switching Power Supply；
Fig. 3 is the circuit diagram of the utility model Switching Power Supply；
Fig. 4 is the circuit diagram of the utility model judgment module and adjustment module；
Fig. 5 is the fixed turn-on time framework waveform diagram of tradition；
Fig. 6 is the turn-on time framework waveform diagram of the utility model；
Symbol in Fig. 1 is expressed as: 11- resistance, 12- error amplifier, 13- ripple generator, 21- first comparator,
31- logic element, 32- driving circuit, 40- turn-on time control module, 50- minimum turn-off time control module, 60- judge mould
Block, 70- adjustment module.
Specific embodiment
In order to be clearer and more clear technical problem to be solved in the utility model, technical solution and beneficial effect, with
Under in conjunction with the accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
Example is applied only to explain the utility model, is not used to limit the utility model.
The control mode of Switching Power Supply can be divided into fixed-frequency control and frequency control, referring to Fig. 1, traditional frequency control mould
The main switch turn-on time of formula is fixed, and the turn-off time changes as output voltage and load change, its working principles are as follows: defeated
Voltage V outOUTFeedback voltage V is obtained by the partial pressure of resistance 11FB, error amplifier 12 is to VFBWith Switching Power Supply internal reference voltage
VREFDifference amplify to obtain error amplification signal VCOMP, ripple generator 13 generate have certain amplitude triangular wave with
VFBIt is overlapped to obtain ripple superimposed signal VADD, VCOMPWith VADDThe shutdown of each period main switch is determined by comparator, often
The turn-on time of a period main switch is determined by turn-on time control module 40.Minimum turn-off time control module 50 can be kept away simultaneously
Exempt from the phenomenon that 100% duty ratio occur.The main switch turn-on time of the control loop is fixed, the turn-off time with output voltage and
Load variation, therefore switching frequency and be not fixed.Compared to fixed-frequency control mode, frequency control is not needed in load current step
To the arrival of next cycle, output voltage can quickly open next cycle when changing, therefore response speed is faster.
Referring to Fig. 2, the application provides a kind of quick pressure stabilizing implementation method of Switching Power Supply, leading for main switch can be shortened
The logical time, this method comprises:
Switching Power Supply is equipped with feed circuit, obtains feedback voltage VFB, according to feedback voltage VFBWith Switching Power Supply internal reference
Voltage VREFGenerate error amplification signal VCOMP；
Feedback voltage VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal VADD；
Compare the VCOMPWith VADDSize controls the on-off of main switch；
Compare the VCOMPWith VADD, judge the working condition of Switching Power Supply；When judging Switching Power Supply for steady state operating conditions
When, the turn-on time of main switch and minimum turn-off time are constant；When judging Switching Power Supply in load current step, i.e. VCOMPGreater than VADD,
When for dynamic behavior, the turn-on time of main switch increases, and the minimum turn-off time reduces, and then accelerates dynamic corresponding speed,
Realize quick pressure stabilizing.
Referring to Fig. 3, the utility model additionally provides a kind of Switching Power Supply using the above method, Switching Power Supply is load
Output voltage V is providedOUT, Switching Power Supply includes feedback module, comparison module, drive module, turn-on time control module 40, most
Small turn-off time control module 50, judgment module 60 and adjustment module 70.
The feedback module includes error amplifier 12, ripple generator 13；The error amplifier 12 VFB
And VREF, and V is generated according to the difference of the twoCOMP；The ripple generator 13 export stability triangle wave and with the VFBSuperposition,
Generate VADD, when guaranteeing Switching Power Supply stable state, the VADDGreater than the VCOMP；The comparison module includes first comparator
21, the first comparator 21 VCOMPAnd VADD。
The drive module includes logic element 31 and driving circuit 32.
Referring to Fig. 4, the turn-on time control module 40 includes and input voltage VINRelevant current source I1, capacitor
C1, switch K1 and the second comparator；The one end C1 ground connection, the other end connect the I1 and charge, the K1 parallel connection C1, institute
The second comparator is stated to compare the current potential of C1 and preset current potential V1, when the current potential of C1 reaches V1, the turn-on time control
Module 40 controls the drive module and closes main switch, while the K1 is closed, and when starting to the next period, K1 is disconnected, and I1 is again
It is secondary to charge to C1, the fixation turn-on time in each period is formed repeatedly.
The minimum turn-off time control module 50 is similar with turn-on time control module 40, including current source I2, capacitor
C2, switch K2 and third comparator, the one end C2 ground connection, the other end connect the I2 and charge, the K2 parallel connection C2, institute
Third comparator is stated to compare the current potential of C2 and preset current potential V2, when the current potential of C2 reaches V2, the minimum turn-off time
Control module 50 controls the drive module and opens main switch, while the K2 is closed, and when starting to the next period, K2 is disconnected.
The judgment module 60 is sentenced including the 4th comparator, the 4th comparator VCOMPAnd VADD；The tune
Saving module 70 includes current source I3, current source I4, switch K3, switch K4.
The I3 connects the C1 by K3, and the I3 current direction is opposite with the I1 current direction；The I4 passes through
The K4 connection C2；The direction I4 is identical as the direction I2；4th comparator connects and controls the K3 and K4；When
VCOMPGreater than VADDWhen, the K3 and K4 closure, the I3 offset I1, and the I4 is superimposed I2, and the C1 charging time is elongated, C2 charging
Time shortens, and turn-on time is elongated, and the minimum turn-off time shortens, and accelerates the response speed of control circuit.
The working principle of the Switching Power Supply is as follows: the feedback module obtains feedback voltage VFB, according to VFBWith Switching Power Supply
Internal reference voltage VREFGenerate error amplification signal VCOMP, by VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal
VADD；
The comparison module VADDAnd VCOMP, determine the on-off of main switch, and send and instruct to drive module；
The on-off of main switch is realized in the instruction that the drive module receives the comparison module；
The turn-on time control module 40 controls the turn-on time of each period main switch；
The minimum turn-off time control module 50 controls the minimum turn-off time of each period main switch；
The judgment module 60 is according to VADDAnd VCOMPJudge the working condition of each cycle switch power supply；
When the adjustment module 70 accordingly adjusts turn-on time and minimum turn-off according to above-mentioned 60 judging result of judgment module
Between；As the VOUTWhen for stable state, the adjustment module 70 does not work；As the VOUTWhen for step state, i.e. VCOMPGreatly
In VADD, the adjustment module 70 controls the turn-on time control module 40 and increases turn-on time, and controls the minimum turn-off
Time control reduces the minimum turn-off time, shortens the time of a cycle, accelerates dynamic responding speed, enables Switching Power Supply
It is cracking to stabilize the output voltage.
Please referring to Fig. 5 and Fig. 6, wherein Fig. 5 is the fixed turn-on time framework waveform diagram of tradition, when load increases suddenly,
Output capacitance supplying power for outside at this time, output voltage VOUTDecline, feedback voltage VFBDecline, error amplification signal VCOMPIt rises with it,
Ripple superimposed signal VADDDecline, loop enters variable frequency work at this time, and main switch each period is charged with fixing turn-on time, most
Small turn-off time afterflow, compared with normal work, frequency increases to obtain capability of fast response.Fig. 6 is opening for the application proposition
The framework waveform diagram in powered-down source, when load increases suddenly, loop still enters variable frequency work, and loop detection is put to error at this time
Big signal VCOMPMore than ripple superimposed signal VADD, loop is into the second working condition, by the turn-on time increase of main switch, most
The small turn-off time reduces, so that inductive current supplements energy, output voltage V to output as early as possibleOUTFall become smaller, and energy
It is enough to restore normal value in the shorter time, further speed up response speed.
In conclusion compared to the prior art, the utility model proposes a kind of Switching Power Supply quick pressure stabilizing realization side
Method and Switching Power Supply can determine whether the working condition of Switching Power Supply by addition judgment module and adjustment module in Switching Power Supply,
And then the make-and-break time of main switch is adjusted by adjustment module, and work as load current step, it is main when Switching Power Supply is in dynamic behavior
The turn-on time of switch increases, and the minimum turn-off time reduces, and then accelerates dynamic corresponding speed, realizes quick pressure stabilizing.
The utility model is exemplarily described above in conjunction with attached drawing, it is clear that the utility model specific implementation not by
The limitation of aforesaid way, as long as the various unsubstantialities carried out using the method concept and technical solution of the utility model change
Into, or it is not improved the conception and technical scheme of the utility model are directly applied into other occasions, in the utility model
Protection scope within.
Claims (5)
1. a kind of Switching Power Supply, Switching Power Supply provides output voltage V for loadOUT, which is characterized in that Switching Power Supply includes feedback
Module, comparison module, drive module, turn-on time control module, minimum turn-off time control module, judgment module and adjusting mould
Block；
The feedback module obtains feedback voltage VFB, according to VFBWith Switching Power Supply internal reference voltage VREFGenerate error amplification letter
Number VCOMP, by VFBIt is superimposed with the ripple voltage of input and generates ripple superimposed signal VADD；
The comparison module VADDAnd VCOMP, determine the on-off of main switch；
The on-off of main switch is realized in the instruction that the drive module receives the comparison module；
The turn-on time control module controls the turn-on time of each period main switch；
The minimum turn-off time control module controls the minimum turn-off time of each period main switch；
The judgment module judges the working condition of each cycle switch power supply；
The adjustment module accordingly adjusts turn-on time and minimum turn-off time according to above-mentioned judgment module judging result；When described
VOUTWhen for stable state, the adjustment module does not work；As the VOUTWhen for step state, described in the adjustment module control
Turn-on time control module increases turn-on time, and controls the minimum turn-off time control and reduce the minimum turn-off time, accelerates
Dynamic responding speed.
2. a kind of Switching Power Supply according to claim 1, which is characterized in that the feedback module includes error amplifier,
Ripple generator；The error amplifier VFBAnd VREF, and V is generated according to the difference of the twoCOMP；The ripple produces
Raw device output stability triangle wave and with the VFBSuperposition generates VADD；The comparison module includes first comparator, and described first
The comparator VCOMPAnd VADD。
3. a kind of Switching Power Supply according to claim 2, which is characterized in that the drive module includes logic element and drive
Dynamic circuit.
4. a kind of Switching Power Supply according to claim 2, which is characterized in that the turn-on time control module include with it is defeated
Enter voltage VINRelevant current source I1, capacitor C1, switch K1 and the second comparator；The one end C1 ground connection, the other end connect institute
It states I1 to charge, the K1 parallel connection C1, second comparator compares the current potential of C1 and presets current potential V1, when the electricity of C1
When position reaches V1, the turn-on time control module controls the drive module and closes main switch, while the K1 is closed, and is arrived down
When a period starts, K1 is disconnected；The minimum turn-off time control module includes current source I2, capacitor C2, switch K2 and third
Comparator, the one end C2 ground connection, the other end connect the I2 and charge, the K2 parallel connection C2, the third comparator ratio
Current potential compared with C2 and current potential V2 is preset, when the current potential of C2 reaches V2, the minimum turn-off time control module controls institute
It states drive module and opens main switch, while the K2 is closed, when starting to the next period, K2 is disconnected.
5. a kind of Switching Power Supply according to claim 4, which is characterized in that the judgment module is sentenced to be compared including the 4th
Device, the 4th comparator VCOMPAnd VADD；The adjustment module includes current source I3, current source I4, switch K3,
Switch K4；The I3 connects the C1 by K3, and the direction I3 is contrary with the I1；The I4 passes through described in K4 connection
C2；The direction I4 is identical as the direction I2；4th comparator connects and controls the K3 and K4；Work as VCOMPIt is greater than
VADDWhen, the K3 and K4 closure, the I3 offset I1, and the I4 is superimposed I2, and the C1 charging time is elongated, and the C2 charging time shortens,
Turn-on time is elongated, and the minimum turn-off time shortens, and accelerates the response speed of control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820682945.XU CN208401739U (en) | 2018-05-09 | 2018-05-09 | A kind of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820682945.XU CN208401739U (en) | 2018-05-09 | 2018-05-09 | A kind of Switching Power Supply |
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| Publication Number | Publication Date |
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| CN208401739U true CN208401739U (en) | 2019-01-18 |
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ID=65062139
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| CN201820682945.XU Active CN208401739U (en) | 2018-05-09 | 2018-05-09 | A kind of Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599567A (en) * | 2018-05-09 | 2018-09-28 | 厦门元顺微电子技术有限公司 | A kind of quick voltage stabilizing implementation method and Switching Power Supply of Switching Power Supply |
-
2018
- 2018-05-09 CN CN201820682945.XU patent/CN208401739U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599567A (en) * | 2018-05-09 | 2018-09-28 | 厦门元顺微电子技术有限公司 | A kind of quick voltage stabilizing implementation method and Switching Power Supply of Switching Power Supply |
| CN108599567B (en) * | 2018-05-09 | 2024-05-14 | 厦门元顺微电子技术有限公司 | Quick voltage stabilization implementation method of switching power supply and switching power supply |
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