CN109256942A - A kind of self-adapting starting circuit suitable for primary side feedback flyback converter - Google Patents
A kind of self-adapting starting circuit suitable for primary side feedback flyback converter Download PDFInfo
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- CN109256942A CN109256942A CN201811293105.5A CN201811293105A CN109256942A CN 109256942 A CN109256942 A CN 109256942A CN 201811293105 A CN201811293105 A CN 201811293105A CN 109256942 A CN109256942 A CN 109256942A
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- 230000001939 inductive effect Effects 0.000 claims abstract description 40
- 230000005611 electricity Effects 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005347 demagnetization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of self-adapting starting circuit suitable for primary side feedback flyback converter, belongs to switch power technology field.The negative input of error amplifier connects the primary side inductive current proportional to primary side feedback flyback converter output voltage and limits signal, and positive input connects reference voltage, and output end connects the negative input of first comparator；The positive input of first comparator connects sawtooth signal, output end output pulse width modulated signal；The positive input connection primary side inductive current of second comparator limits signal, and negative input connects primary side inductive current peak signal, and output current limiting judges signal after output end passes through latch；Logic module judges that signal generates output signal and is used to control being switched on and off for switching tube in primary side feedback flyback converter according to pulse width modulating signal and current limliting.The present invention can adaptively adjust primary side feedback flyback converter starting speed and guarantee that it always works in DCM mode.
Description
Technical field
The invention belongs to switch power technology fields, are related to a kind of adaptively opening suitable for primary side feedback flyback converter
Dynamic circuit.
Background technique
Primary side feedback flyback converter has natural input and output electric isolating effect, is not necessarily to optocoupler, easily extends multichannel
The advantages such as output, are the products in Switching Power Supply by favor.In primary side feedback flyback converter, secondary inductance demagnetization speed
Size depending on output voltage.In start-up course, output voltage slowly rises from zero, causes secondary inductance demagnetization speed in phase
When smaller in the long time, transformer can not reset completely, and systems stay works under CCM mode (continuous conduction mode), can
It can lead to the series of negative effects such as unstable system, power tube overcurrent damage, sampled voltage mistake.
In flyback converter, if circuit works in CCM mode, in one cycle, energy can not achieve from primary side
Side not only increases the volume of transformer to the totally tansitive of secondary side, and also resulting in system, there are a Right-half-plant zeros.
Loop bandwidth is reduced to the position much smaller than Right-half-plant zero by loop compensation by traditional solution, but narrow ring
Road bandwidth will lead to that loop response is excessively slow, limit the high frequency development of Switching Power Supply.Thus it is guaranteed that system always works in
It is the mode for fundamentally releasing Right-half-plant zero under DCM mode (discontinuous conduction mode).On the other hand, primary side feedback flyback
Converter voltage sampling technique depends on the harmonic wave feature under DCM mode after secondary inductance demagnetization more, and for work
Make system in ccm mode, it is difficult to obtain output voltage information, therefore, starting and stabilization sub stage in flyback converter are protected
Card circuit always works in particularly significant under DCM.
Existing control chip slowly charges to realize soft start to bulky capacitor outside piece by controlling electric current, and system is avoided to start
When continue working in CCM mode, but this mode not only consumes additional pcb board area, and soft start capacitor must be accurate
Design, too small capacitance makes system be difficult to start in dcm mode, and it is too long that excessive capacitance will lead to system start-up time,
Output voltage is established slow.In addition also by during startup reduce primary side feedback flyback converter working frequency, from
And starting speed is reduced to avoid enter into the solution of CCM mode.But both solutions all do not account for output
The variation of information, and whether real system can enter CCM mode, depend primarily on former secondary inductance size and input and output voltage
Value, former secondary inductance size and input voltage value be typically designed after the completion of be determining, therefore uniquely cause system possibly into
The only output voltage information of CCM mode, output voltage is higher, VO/LSBigger, the secondary side erasing time is smaller, is less susceptible to enter
CCM mode, on the contrary more it is easily accessible CCM mode.
Summary of the invention
For be difficult to control in above-mentioned primary side feedback flyback converter start-up course DCM mode work and traditional soft
The use of the outer bulky capacitor of piece consumes excessive pcb board area and increases the problem that cost and precision are difficult to control in Starting mode,
The invention proposes a kind of self-adapting starting circuits suitable for primary side feedback flyback converter, are not necessarily to additional designs soft start,
Starting speed can be adjusted according to the output voltage dynamic of primary side feedback flyback converter, guarantee primary side feedback during startup
Flyback converter always works under DCM mode.
The technical solution of the present invention is as follows:
A kind of self-adapting starting circuit suitable for primary side feedback flyback converter, including error amplifier, first compare
Device, the second comparator, latch and logic module；
The negative input connection primary side inductive current of error amplifier limits signal VKnee, positive input connection benchmark
Voltage Vref, the negative input of output end connection first comparator；The primary side inductive current limits signal VKneeFor with it is described
The proportional voltage signal of the output voltage of primary side feedback flyback converter；
The positive input rate of connections of first comparator is equal with the working frequency of the primary side feedback flyback converter
Sawtooth signal, output end output pulse width modulated signal PWM and the first input end for connecting the logic module；
The positive input of second comparator connects the primary side inductive current and limits signal VKnee, negative input connection
Primary side inductive current peak signal VCS, output current limiting judges signal P after output end passes through latchLimitAnd it is patrolled described in connecting
Collect the second input terminal of module；
The output signal of the logic module for control in the primary side feedback flyback converter unlatching of switching tube and
Shutdown, when the pulse width modulating signal PWM and current limliting judge signal PLimitLogic module output when being high level
Otherwise high level exports low level.
Specifically, the logic module include with door, with the first input end of door as the first defeated of the logic module
Enter end, second input terminal of second input terminal as the logic module, output end exports the output of the logic module
Signal.
The invention has the benefit that the present invention will be proportional to the output feedback voltage of primary side feedback flyback converter
Information of voltage is limited as primary side inductance peak point current, can either guarantee that circuit always works under DCM mode, while can guarantee
Output can normally rise；In addition the system that self-adapting starting circuit proposed by the present invention improves primary side feedback flyback converter
Stability eliminates the bulky capacitor under traditional soft-start mode, further improves the integrated of primary side feedback flyback converter
Starting speed can be adaptively adjusted when spending, and rising faster or slower on the output voltage.
Detailed description of the invention
Fig. 1 is that a kind of self-adapting starting circuit suitable for primary side feedback flyback converter proposed by the present invention is applied to original
Feed back the structural schematic diagram in flyback converter in side.
Fig. 2 is a kind of operating wave of the self-adapting starting circuit suitable for primary side feedback flyback converter proposed by the present invention
Shape schematic diagram.
Fig. 3 is a kind of self-adapting starting circuit suitable for primary side feedback flyback converter proposed by the present invention in embodiment
In structural schematic diagram.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is described in detail.
It is the knot applied self-adapting starting circuit proposed by the present invention in primary side feedback flyback converter as shown in Figure 1
Structure schematic diagram, primary side feedback flyback converter include primary side winding, vice-side winding and auxiliary winding.Primary side winding includes primary side electricity
Feel LP, switching tube NM1With primary side inductive current detection resistance RCS, primary inductor LPUpper termination primary side feedback flyback converter
Input node VIN, lower termination switching tube NM1Drain terminal；Switching tube NM1Source on the one hand pass through primary side inductive current detection electricity
Hinder RCSAfter be grounded, on the other hand may cause maloperation by what lead-edge-blanking circuit for eliminating switching tube was connected that moment occurs
Current spike after generate primary side inductive current peak signal VCS.Vice-side winding includes secondary inductance LS, diode D1, output electricity
Hold COWith output resistance RO, diode D1Negative terminal meets the output node V of primary side feedback flyback converterO, diode D1Positive termination is secondary
Side inductance LS, output capacitance COWith output resistance ROAnd it is connected in output node VOBetween ground terminal.Auxiliary winding include auxiliary around
Group inductance LA, the first divider resistance R1With the second divider resistance R2, primary inductor LPWith secondary inductance LSSame Name of Ends is on the contrary, primary side is electric
Feel LPWith auxiliary winding inductance LASame Name of Ends is opposite；First divider resistance R1One end and the second divider resistance R2One end series connection, first
Divider resistance R1The other end connects auxiliary winding inductance LAOne end, the second divider resistance R2The other end connects auxiliary winding inductance LA
The other end is simultaneously grounded；First divider resistance R1With the second divider resistance R2Series connection point after a sample circuit by obtaining comprising original
The output voltage feedback information of flyback converter is fed back on side, and the primary side inductive current in the present invention limits signal VKneeIt is and samples
The proportional voltage signal of the output voltage of the primary side feedback flyback converter arrived, primary side inductive current limit signal VKneeAs original
Side inductance adaptive peak electric current limit.
When primary side feedback flyback converter circuit is under DCM mode ON operation mode:
tON+tS< T (1)
Wherein tONIndicate switching tube NM1Turn-on time, tsIndicate secondary inductance LSErasing time, T indicate primary side feedback flyback
The switch periods of converter.When primary side inductive current limits signal VKneeWhen being arranged excessively high, primary side electricity in each period may cause
The energy of sense can not all pass to secondary side, therefore circuit enters CCM mode.
Simultaneously to ensure that output filter capacitor voltage is normally established, the energy that primary side inductance provides must be negative greater than startup stage
Consumption energy is carried, therefore available
Wherein VOIndicate output voltage, RLIndicate load resistance value, IPKIndicate primary side inductive current peak, LPIndicate primary side electricity
Inductance value size.When primary side inductive current limits signal VKneeWhen being arranged too low, the energy of primary side inductive current offer in each period
It all is supported consumption, is charged without remaining energy to output capacitance, it is thus possible to cause output voltage that can not rise.Therefore
Determine a reasonable primary side inductive current limit signal VKneeIt can either guarantee that circuit always works under DCM mode, while energy
It is enough to guarantee that output normally rise.
Based on this, a kind of self-adapting starting circuit suitable for primary side feedback flyback converter proposed by the present invention will be with
The voltage signal that the output feedback voltage information of primary side feedback flyback converter is proportional is limited as primary side inductance peak point current, this
With the output voltage that ratio is the 1 primary side feedback flyback converter that will be sampled directly as primary side inductance electricity in embodiment
Ductility limit signal VKnee.As shown in Figure 1, self-adapting starting circuit includes error amplifier, first comparator, the second comparator, lock
Storage and logic module；The primary side feedback flyback converter that the negative input connection sampling circuit samples of error amplifier obtain
Output voltage as in the present embodiment primary side inductive current limit signal VKnee, positive input connection reference voltage Vref,
The negative input of its output end connection first comparator；The positive input rate of connections and primary side feedback of first comparator are anti-
The equal sawtooth signal of the working frequency of exciting converter, output end output pulse width modulated signal PWM simultaneously connect logic
The first input end of module；The positive input connection primary side inductive current of second comparator limits signal VKnee, negative sense input
End connection primary side inductive current peak signal VCS, output current limiting judges signal P after output end passes through latchLimitAnd it connects
Second input terminal of logic module；Switching tube NM in the output signal connection primary side feedback flyback converter of logic module1Grid
End is used for control switch pipe NM1Be switched on and off, when pulse width modulating signal PWM and current limliting judge signal PLimitIt is
Logic module exports high level when high level, otherwise exports low level.
Primary side inductive current limits signal VKneeWith reference voltage VrefCompare the output of generation by error amplifier, then and
Sawtooth signal generates pulse width modulating signal PWM by first comparator, and sawtooth signal is that frequency and primary side feedback are anti-
Exciting converter working frequency is identical, signal of the peak ranges in the output area of error amplifier.
Second comparator passes through detection primary side inductive current peak signal VCSSignal V is limited with primary side inductive currentKneePass
System generates current limliting and judges voltage signal VLimit；Although using the output voltage of primary side feedback flyback converter as original in the present embodiment
Side inductive current peak signal VCSElectric current limit, but can also be utilized in some embodiments and primary side feedback flyback converter
Output voltage limits signal V as primary side inductive current at the signal of other proportionate relationshipsKnee, when primary side inductive current peak signal
VCSSignal V is limited more than primary side inductive currentKneeWhen the second comparator output switching activity.
Latch is controlled in each period latch using the clock signal of primary side feedback flyback converter and stores first
Secondary primary side inductive current peak signal VCSVoltage is greater than primary side inductive current and limits signal VKneeThe output of the second comparator is caused to be turned over low
At the time of, and this low level state is kept to arrive until next cycle.This is because when the second comparator output turn over it is low
Afterwards, switching tube NM1Shutdown, primary side inductive current can drop to 0 within moment, lead to VCSVoltage also falls to 0, at this time the second ratio
V is come back to compared with deviceCSLess than VKneeState, so as to cause the second comparator output turn over height again, if without latch meeting
Lead to switching tube NM1It is connected again, therefore the state of the second comparator can not also stop to overturn between height.Use latch
Avoiding the second comparator and exporting not stop to overturn leads to switching tube NM1Constantly switch between on state and off state.
The current limliting of second comparator output judges voltage signal VLimitSignal P is judged by the current limliting that latch generatesLimit
Logical process is carried out to the pulse-width signal PWM of first comparator output, when pulse width modulating signal PWM and current limliting judge
Signal PLimitLogic module exports high level when being high level, otherwise exports low level.As shown in figure 3, in some embodiments
Logic module include with door, obtain the switching signal of adaptive DCM mode starting using with operation is carried out with door, pass through driving
Connection switch pipe NM after circuit1Grid, thus control switch pipe NM1Turn-on and turn-off.In addition to utilizing in other embodiments
With door, it can also be triggered using rising edge or failing edge triggers this logic to control to obtain logic module output signal.
To sum up, a kind of self-adapting starting circuit suitable for primary side feedback flyback converter proposed by the present invention, will be with original
The proportional voltage signal of feedback voltage that exports that flyback converter is fed back on side is limited as primary side inductance peak point current, with circuit
Start, the voltage in auxiliary winding is through the first divider resistance R1With the second divider resistance R2After partial pressure, VAUXVoltage includes output electricity
Press size information.The output that sampling obtains primary side feedback flyback converter is carried out to the voltage in auxiliary winding by sample circuit
Voltage limits signal using the voltage signal proportional to the output voltage of primary side feedback flyback converter as primary side inductive current
VKnee, primary side inductive current limit signal VKneeIt is primary side inductive current detection resistance RCSOn voltage VCSElectric current limit.Switching tube
NM1When conducting, primary side inductive current peak signal VCSIt is gradually increasing with primary side inductive current, is limited when touching primary side inductive current
Signal VKneeWhen latch output signal PLimitControl pwm signal turn over it is low, thus control switch pipe NM1Shutdown, completes defeated
Control of the voltage swing to turn-on time out makes to always work under DCM mode when circuit start.The present invention can be realized primary side
Feedback flyback converter is always worked in during startup under DCM mode, avoids the occurrence of system transfer function under CCM mode
Right-half-plant zero improves system stability, eliminates the bulky capacitor under traditional soft-start mode, further improves anti-
The integrated level of exciting converter, and while rising faster or slower on the output voltage, can adaptively adjust starting speed.
Those skilled in the art disclosed the technical disclosures can make various do not depart from originally according to the present invention
Other various specific variations and combinations of essence are invented, these variations and combinations are still within protection scope of the present invention.
Claims (2)
1. a kind of self-adapting starting circuit suitable for primary side feedback flyback converter, which is characterized in that including error amplifier,
First comparator, the second comparator, latch and logic module；
The negative input connection primary side inductive current of error amplifier limits signal (VKnee), positive input connects benchmark electricity
Press (Vref), output end connects the negative input of first comparator；The primary side inductive current limits signal (VKnee) for institute
State the proportional voltage signal of the output voltage of primary side feedback flyback converter；
The positive input rate of connections of the first comparator saw equal with the working frequency of the primary side feedback flyback converter
Tooth wave signal, output end output pulse width modulated signal (PWM) and the first input end for connecting the logic module；
The positive input of second comparator connects the primary side inductive current and limits signal (VKnee), negative input connection is former
Side inductive current peak signal (VCS), output current limiting judges signal (P after output end passes through latchLimit) and connect described in
Second input terminal of logic module；
The output signal of the logic module is used to control being switched on and off for switching tube in the primary side feedback flyback converter,
When the pulse width modulating signal (PWM) and current limliting judge signal (PLimit) when being high level the logic module output it is high
Otherwise level exports low level.
2. the self-adapting starting circuit according to claim 1 suitable for primary side feedback flyback converter, which is characterized in that
The logic module includes the first input end with the first input end of door as the logic module with door, the second input
The second input terminal as the logic module is held, output end exports the output signal of the logic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811293105.5A CN109256942B (en) | 2018-11-01 | 2018-11-01 | Self-adaptive starting circuit suitable for primary side feedback flyback converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811293105.5A CN109256942B (en) | 2018-11-01 | 2018-11-01 | Self-adaptive starting circuit suitable for primary side feedback flyback converter |
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| Publication Number | Publication Date |
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| CN109256942A true CN109256942A (en) | 2019-01-22 |
| CN109256942B CN109256942B (en) | 2020-03-31 |
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| CN201811293105.5A Expired - Fee Related CN109256942B (en) | 2018-11-01 | 2018-11-01 | Self-adaptive starting circuit suitable for primary side feedback flyback converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157781A (en) * | 2020-01-08 | 2020-05-15 | 电子科技大学 | Dynamic knee point detection circuit |
| CN111880598A (en) * | 2020-08-25 | 2020-11-03 | 电子科技大学 | Voltage compensation circuit of self-adaptive load cable |
| CN113765347A (en) * | 2021-09-03 | 2021-12-07 | 江苏润石科技有限公司 | DC-DC circuit structure and method for eliminating burr influence |
| CN115441702A (en) * | 2022-11-08 | 2022-12-06 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157781A (en) * | 2020-01-08 | 2020-05-15 | 电子科技大学 | Dynamic knee point detection circuit |
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| CN111880598A (en) * | 2020-08-25 | 2020-11-03 | 电子科技大学 | Voltage compensation circuit of self-adaptive load cable |
| CN111880598B (en) * | 2020-08-25 | 2021-06-08 | 电子科技大学 | Voltage compensation circuit of self-adaptive load cable |
| CN113765347A (en) * | 2021-09-03 | 2021-12-07 | 江苏润石科技有限公司 | DC-DC circuit structure and method for eliminating burr influence |
| CN113765347B (en) * | 2021-09-03 | 2024-03-12 | 江苏润石科技有限公司 | DC-DC circuit structure and method for eliminating burr effect |
| CN115441702A (en) * | 2022-11-08 | 2022-12-06 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
| CN115441702B (en) * | 2022-11-08 | 2023-02-17 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
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| CN109256942B (en) | 2020-03-31 |
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