CN106533205A - Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working - Google Patents
Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working Download PDFInfo
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- CN106533205A CN106533205A CN201610940902.2A CN201610940902A CN106533205A CN 106533205 A CN106533205 A CN 106533205A CN 201610940902 A CN201610940902 A CN 201610940902A CN 106533205 A CN106533205 A CN 106533205A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a method for improving the constant-voltage sampling precision of a primary-side feedback flyback power supply. For the disadvantages of a traditional constant-voltage sampling strategy of the primary-side feedback flyback power supply under high power, traditional simulation-mode CCM (continuous current mode) fixed-point sampling strategy and digital approximation-type DCM (discontinuous current mode) sampling strategy are abandoned, and a digital slope sampling method is provided. A sawtooth wave is used for sampling in a DCM working mode by combining a comparator, and a single-slope digital wave is used for sampling in a CCM working mode; reference voltage in the CCM mode is continuously updated through inserting a DCM period by combining reference voltage adjustment; and the sampling precision and the constant-voltage characteristic are improved. By adopting a flexible digital sampling strategy, the effect of +/-2% of constant-voltage precision can be obtained, thereby improving the constant-voltage characteristic of a primary-side feedback flyback converter under high power.
Description
Technical field
The present invention relates to isolation type switching power supply changer, more particularly to a kind of primary side feedback flyback sourse that improves is in constant pressure
Digital sample method under state, it is adaptable to primary side feedback flyback sourse during high power work.
Background technology
With the fast development of home electronics, the demand of efficient power is also increasingly improved, AC-DC power supplys are caused
The fast development of changer.The development of electronic equipment proposes new index for AC-DC supply convertors, the energy consumption of equipment and
Control accuracy becomes the focus of current power industry.In Power Management Design field, reverse exciting topological structure due to simple structure, into
This is low, the advantages of wide input range, is widely used in supply convertor.With the raising of flyback sourse output, big work(
Sampling under rate under flyback sourse constant voltage mode is gradually highlighted.First, CCM (electric currents are must be introduced under high-power
Continuous mode), and the strategy combined with reference voltage adjustment using ADC grab samplings more than the sampling under traditional CCM patterns,
The sample mode load regulation of this simulation is larger, and response speed is slow, and high cost has drift, and dumb.Secondly, it is existing
Using digital two-wire sampling policy more than the sample mode of high-power lower DCM (discontinuous conduct mode) pattern having, due to high-power
The slope of lower former limit assists winding waveform is gentle, and the waveform after flex point is excessively steep, causes the slope condition sampled undesirable,
Adjustable extent is narrow, and precision is not high.
Referring to Fig. 1, a kind of primary side feedback inverse-excitation type electricity of common employing two-wire sampling policy in prior art is shown
Source converter.Described switching power converters gather voltage waveform of the former limit assists winding after electric resistance partial pressure first
Vsense, then this voltage waveform is compared with Vref1 (reference voltage 1) and Vref2 (reference voltage 2) combination for having fixed pressure reduction
Device is compared, and is calculated corresponding off time tgap, by with reference value trefComparison obtains error amount, then by control
Module is modified, and final sampling obtains knee voltage value.
Such as Fig. 2, under the DCM state sampling situations of low voltage and low power, the sampling policy shown in Fig. 2 is convenient applicable.Profit
With the particularity of corner position, by setting two-wire gap pressure reduction, as sample waveform slope is different before and after flex point, can adopt
Difference of the sample to off time, so as to move up and down two-wire, keeps all the time near corner position, and flex point is in DCM states
Under can be accurately obtained output voltage values, therefore scheme is suitable.But in the case of high-tension high-power, the sampling policy is no longer fitted
With.Such as Fig. 3, the oscillogram of two-wire sampling policy in the case of showing high-tension high-power, under DCM patterns, is adopted.Now sample
Waveform is gentle, slope is little, and waveform is steep after flex point, and slope is very big, and the slope condition of two-wire sampling policy is undesirable, causes
Sampling precision is not high, flex point follows effect poor, causes the closed loop stability and voltage regulation performance of system poor.
The content of the invention
In the case of existing high-tension high-power, defect of the flyback sourse in pressure constant state down-sampling low precision, this
Invention is sampled by analyzing influence there is provided a kind of raising digital sample method of the primary side feedback flyback sourse under pressure constant state
The factor of precision, is sampled with sawtooth waveforms in dcm operating modes；Carried out with monocline slope digital wave under CCM mode of operations
Reference voltage adjustment is sampled and combined, by inserting the DCM cycles, the reference voltage under CCM patterns is constantly updated, is improve big work(
Sampling precision and constant-voltage characteristic under rate flyback sourse constant pressure.By final emulation and test, compare discovery, constant pressure can be obtained
Precision is ± 2% effect, so as to improve the constant-voltage characteristic of high-power lower inverse excitation type converter, further expands former limit anti-
Feedback application of the inverse-excitation type switch power-supply under high-power.
For achieving the above object, the present invention is employed the following technical solutions：A kind of raising primary side feedback flyback sourse is big
The method of power work constant pressure sampling precision, it is characterised in that：Under the main topological structure of primary side feedback, configuration information collection mould
Block, mode decision module, digital ramp occur module, comparator module, slope sampling module and reference voltage adjusting module with
Controlled Switching Power Supply constitutes closed loop system.Information acquisition module enters row information to the electric resistance partial pressure in former limit assists winding and adopts
Collection；The voltage waveform information in assists winding that mode decision module is collected according to information acquisition module carries out mode decision,
Judge that current system is operated in DCM patterns or CCM patterns；There is module and judge according to mode decision module in digital ramp
Different mode of operation produce corresponding digital ramp, produce sawtooth waveforms under DCM patterns, under CCM patterns, produce monocline slope number
Word ripple；Voltage waveform Vsense in the assists winding that information acquisition module is collected by comparator module and digital ramp occur
The digital ramp that module is produced is compared, and by the square wave information transmission for relatively obtaining later to slope sampling module.Slope
The information that sampling module is exported according to comparator module, mode decision module and information acquisition module, in different Working moulds
Sampled using corresponding method under formula, obtained high-precision sampled value；And sampled value is sent to into ginseng in ccm mode
Voltage regulator module is examined, under CCM patterns, reference voltage adjusting module is constantly updated under CCM patterns by inserting the DCM cycles
Reference voltage.The PWM waveform of Switching Power Supply main switch is regulated eventually through drive module, realizes that constant pressure is exported.
Comprise the following steps：
1) information acquisition module carries out information gathering to the electric resistance partial pressure in former limit assists winding, after obtaining electric resistance partial pressure
Voltage waveform Vsense；
2) mode decision module receives the voltage waveform collected by information acquisition module, judges the mode of operation of system：
If more than the reference value of setting, explanation system is operated in CCM patterns to output voltage, otherwise it is assumed that system is operated in DCM patterns；
3) there is the pattern information that module reception pattern judge module sends in digital ramp, according to system Working mould instantly
Formula produces corresponding digital ramp：Sawtooth waveforms is produced under DCM patterns；Monocline slope digital wave is produced under CCM patterns：
4) the voltage waveform Vsense of comparator module receive information acquisition module output and digital ramp generation module are defeated
The digital ramp for going out, is compared using comparator, and voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator
" " holds, and obtains square wave more afterwards, square wave is exported；
5) slope sampling module receives the comparison information of comparator module output and the voltage wave of information acquisition module output
Shape Vsense information and the mode decision information of mode decision module output, obtain current sampled value；
Under DCM patterns, the knee value of voltage waveform Vsense is best able to accurately reflect current output voltage values, adopts
To strive for obtaining the knee value of voltage waveform Vsense during sample, therefore, take the friendship of sawtooth waveforms rising edge and voltage waveform Vsense
Intersection value in point near voltage waveform Vsense corner position is sampled value, and then obtains current output voltage values；
Under CCM patterns, the unique intersection value for taking monocline slope digital wave with voltage waveform Vsense is sampled value, and then is obtained
Current output voltage values；
6) reference voltage adjusting module in ccm mode, receives the sampling value information of slope sampling module output, will insertion
The sampled value in DCM cycles contrasted with the reference value of setting, the reference voltage according to the error of gained to CCM patterns instantly
Value is adjusted；
7) reference voltage adjusting module exports the Duty waveforms of regulating switch power main switch by drive module.
Advantages of the present invention and remarkable result：Adopting digital approximant sampling policy, sampling high-power lower traditional DCM more
Precision is low.Adopting ADC grab sampling strategies traditional CCM, high cost, reaction are slowly, adjustability is poor, there is drift, by environment more
Factor affects big.The defect that the present invention is present for the traditional constant pressure sampling policy of high-power lower primary side feedback flyback sourse, puts
Abandon CCM (continuous current mode) the grab sampling strategies and DCM (the discontinuous current moulds that numeral is approximant of traditional analog form
Formula) sampling policy, a kind of digital ramp method of sampling is proposed, with reference to comparator, is adopted with sawtooth waveforms in dcm operating modes
Sample；Sampled with monocline slope digital wave under CCM mode of operations, and organically combined with reference voltage adjustment, with reference to reference electricity
Pressure adjustment, by inserting the DCM cycles, constantly updates the reference voltage under CCM patterns, improves sampling precision and constant-voltage characteristic.
The digital sample strategy that the present invention is adopted, speed are fast and very flexible, are effectively improved sampling precision, can obtain constant pressure essence
The effect for ± 2% is spent, so as to improve the constant-voltage characteristic of high-power lower primary side feedback anti exciting converter.
Description of the drawings
Fig. 1 is a kind of system diagram of common primary side feedback flyback power supply changer in prior art；
Fig. 2 is DCM two-wire sampling policy oscillograms under a kind of common low-power flyback sourse constant pressure in prior art；
Fig. 3 is DCM two-wire sampling policy oscillograms under a kind of common high-power flyback sourse constant pressure in prior art；
When Fig. 4 is primary side feedback flyback sourse high power work of the present invention, the entirety of constant pressure sampling realizes system diagram；
Fig. 5 is the key waveforms figure of digital sample under DCM patterns in the present invention；
Fig. 6 is the key waveforms figure of digital sample under CCM patterns in the present invention；
Fig. 7 is the key waveforms figure of reference voltage adjustment under CCM patterns in the present invention；
Fig. 8 is the overall flow figure of digital sample strategy of the present invention.
Specific embodiment
From following discussion it should be noted that the alternative embodiment of structures and methods disclosed herein easily will be known
It is not the feasible alternative that may be utilized in the case of the principle without departing substantially from the disclosure.
Now with detailed reference to some embodiments of the disclosure, its example is illustrated in the accompanying drawings.As long as it is noted that can
OK, the similar or identical reference used in figure and which can indicate similar or identical function.Accompanying drawing merely for
Descriptive purpose describes embodiment of the disclosure.Those skilled in the art will readily recognize that from following description, not carry on the back
Can be using the alternative embodiment of structures and methods illustrated herein in the case of the principle of embodiment described herein.
Below in conjunction with drawings and Examples, clear, complete description is carried out to technical scheme.
Such as Fig. 1, main topological structure and the structure chart of sampling module of flyback power supply is given.Former limit auxiliary is gathered first
Voltage waveform of the winding after electric resistance partial pressure, then by the Vref1 (reference voltage 1) of this voltage waveform and fixed pressure reduction and
Vref2 (reference voltage 2) is compared by comparator, and the output signal of two groups of comparators is input to Time Calculation module,
And then obtain off time tgap；Again by tgapError generation module is input to, by the reference value Δ t with off timerefCompare
Error amount is obtained, then error correction is carried out by control module, export revised Vref1 (reference voltage 1) and Vref2 (references
2) voltage, while being calculated required former limit peak value stop voltage Vpeak and switch periods Ts, is finally obtained by drive module
To the PWM waveform of regulating switch power main switch, so as to realize the purpose of constant pressure output.
Fig. 2 is DCM two-wire sampling policy oscillograms under a kind of common low-power flyback sourse constant pressure in prior art.Profit
With the particularity of corner position, the gap pressure reduction between two-wire Vref1 (reference voltage 1) and Vref2 (reference voltage 2) is set
Vgap, it is as sample waveform slope is different before and after flex point, it is thus possible to sample off time Tgap, double so as to move up and down
Line, makes two-wire keep all the time near corner position, and flex point is under DCM states and can be accurately obtained output voltage values, thus
Under low-power, the sampling policy is very applicable.
Fig. 3 is DCM two-wire sampling policy oscillograms under a kind of common high-power flyback sourse constant pressure in prior art.With
Situation under low-power shown in Fig. 2 is compared, it is high-power under voltage waveform is gentle, slope is little, and waveform is steep after flex point, tiltedly
Rate is very big, and the slope condition of two-wire sampling policy is undesirable, and so as to cause, sampling precision is high, flex point follows effect poor, causes
The closed loop stability and voltage regulation performance of system is poor.
When Fig. 4 is primary side feedback flyback sourse high power work of the present invention, the entirety of constant pressure sampling realizes system diagram.In original
Side is fed back under main topological structure, and information acquisition module carries out information gathering to the electric resistance partial pressure in former limit assists winding, and pattern is sentenced
Disconnected module carries out mode decision using the voltage waveform information for collecting, and judges that current system is operated in DCM patterns or CCM
Pattern；There is module and produce corresponding digital ramp according to different mode of operations in digital ramp, produce sawtooth under DCM patterns
Ripple, produces monocline slope digital wave under CCM patterns；Voltage waveform and digital ramp are compared by comparator module, and will be compared
Later the information transmission for obtaining is to slope sampling module；Slope sampling module according to comparator module, mode decision module and
The information that information acquisition module is provided, is sampled using corresponding method under different mode of operations, obtains high accuracy
Sampled value, and sampled value is sent to into reference voltage adjusting module；Under CCM patterns, reference voltage adjusting module is by insertion
In the DCM cycles, the reference voltage under CCM patterns is constantly updated, improve sampling precision and constant-voltage characteristic.Obtain eventually through drive module
To the PWM waveform of regulating switch power main switch pipe, realize that constant pressure is exported.
Such as Fig. 5, for sample waveform in the problem little and that waveform is steep, slope is very big after flex point of flex point front slope, carry
Go out a kind of digital ramp sampling policy.Under DCM patterns, the knee value of Vsense is best able to accurately reflect current output electricity
Pressure value, thus the knee value of Vsense during sampling, will be obtained as far as possible.So, sawtooth waveforms rising edge and former limit is taken under DCM patterns
Intersection value in the intersection point of auxiliary winding voltage waveform Vsense near Vsense corner position is sampled value.
There is module using the digital ramp in Fig. 4 and produce an as shown in Figure 5 sawtooth waveforms for successively decreasing step by step, sawtooth waveforms
Amplitude, ao V be fixed.Voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator " " end, and sawtooth waveforms exists
Each intersection point that can have intersection point, sawtooth waveforms and Vsense with the waveform of Vsense in uphill process can cause comparator to export
The saltus step of value Vref_comp, the rising edge of sawtooth waveforms make comparator output valve Vref_comp be changed into from 0 with the intersection point of Vsense
1, the trailing edge of sawtooth waveforms makes comparator output valve Vref_comp be changed into 0 from 1 with the intersection point of Vsense.According to the defeated of comparator
The hopping edge for going out 0 → 1 can capture the rising edge of sawtooth waveforms and the intersection point of Vsense, and each intersection value is stored in depositor
In, V [1] is the value of first intersection point, and V [2] is the value of second intersection point, the like, V [n] is the value of last intersection point.
After sampling starts, in the trailing edge of output valve Vref_comp of comparator, i.e., whenever the output Vref_ of comparator
Comp from 1 → 0 when, enumerator starts from 0 to count, in the time inside counting of Vref_comp=0, whenever Vref_comp value from
Then count value is stored in depositor during 0 → 1 saltus step, respectively：T[1],T[2],T[3],…,T[n].Wherein, T [1] is the
The count value of the period of one Vref_comp=0, T [2] are the count value of the period of second Vref_comp=0, successively class
Push away, T [n] is the count value of the period of last Vref_comp=0.
As shown in the sampling situations 1 of Fig. 5, if the value difference very little of T [n-1]=T [n] or both, illustrates last
One intersection point is sampled value near flex point, value V [n] for taking last intersection point；As shown in sampling situations 2 in Fig. 5, if T
Differ larger between [n] and T [n-1], then illustrate that last intersection point is under flex point, and due to Vsense after flex point
Waveform is steep, and slope is very big, causes the value of last intersection point to deviate knee value larger.Now, penultimate intersection point is most leaned on
Nearly flex point, so value V [n-1] of inverted second intersection point is sampled value.Specifically judgment rule is：If T [n-1] >=2*
T [n], then value V [n-1] of inverted second intersection point is sampled value；If T [n-1] ＜ 2*T [n], take last intersection point
Value V [n] be sampled value, and then obtain current output voltage values.
By choosing the slope and Δ V of suitable sawtooth waveforms, choose as indicated by the arrows in the figure to the friendship near flex point
Point value is sampled value, that is, obtain the digital value of accurate DCM corner position, and then obtain current output voltage values, so as to gram
Take the problem that slope is little, the steep sampling precision for bringing is not high.
Fig. 6 is the key waveforms figure of digital sample under CCM patterns in the present invention, adopts monocline slope digital wave under CCM patterns
The method of sampling, using in Fig. 4 digital ramp occur module produce a monocline slope digital waveform as shown in Figure 6, by than
The intersection point of digital ramp and sample waveform can be obtained compared with device module, and the intersection point is unique, as final sampled value.It is this to adopt
Quadrat method is simple, and can improve the degree of accuracy of sampling, and the convenient reference voltage adjusting module for combining below is improved under CCM
Constant pressure effect.
Fig. 7 is the key waveforms figure of reference voltage adjustment under CCM patterns in the present invention, and the present invention is in ccm mode by number
Sample and be combined togather with reference voltage adjustment in word slope.As illustrated, dotted portion is actual waveform, bold portion is reason
Think waveform.Insert a DCM cycle in ccm mode, the DCM cycles are will to obtain after itself cycle stretch-out in the previous CCM cycles
Arrive, so the knee voltage value correspondence output voltage values in the DCM cycles.Turning for DCM cycles is obtained by sawtooth waveforms sampling
Point voltage value, and the knee voltage value under constant voltage mode has an ideal value, i.e. reference value VREF.By sampled value and reference value
Compare, and the reference voltage under CCM patterns is adjusted according to both differences.And then tune is changed by control algolithm
The PWM waveform of control Switching Power Supply master switch, the reference voltage level for making ensuing CCM sampled values approach after updating realize constant pressure
It is stable to export.
As illustrated, actual waveform is higher than ideal waveform, then the knee voltage value in the DCM cycles inserted is higher than reference value
VREF, and this just illustrates that the reference voltage under CCM is too high, needs to be turned down, and the amplitude turned down be actual sample value with
Difference between reference value.The PWM waveform of regulating switch power main switch is changed by control algolithm, sampled value is progressively dropped
It is low, new reference voltage is approached, realizes that constant-pressure stable is exported.
Fig. 8 is the overall flow figure of digital sample strategy of the present invention, as illustrated, gathering the voltage in assists winding first
Waveform, followed by mode decision, the current mode of operation of judgement system is CCM or DCM.
If system is operated in DCM patterns instantly, produce digital saw-tooth ripple, so with the voltage waveform for collecting
Vsense is compared by comparator, the information after comparing is sent to together with voltage waveform sampling module, is taken on sawtooth waveforms
Rise along with the intersection point of voltage waveform Vsense near voltage waveform Vsense corner position intersection value be sampled value, finally
Drive module is adjusted correspondingly according to sample voltage value, exports the Duty waveforms of regulating switch power main switch.
If system is operated in CCM patterns instantly, produce monocline slope digital wave, so with the voltage waveform for collecting
Vsense is compared by comparator, the information after comparing is sent to together with voltage waveform sampling module, is uniquely handed over
The magnitude of voltage of point, as sampled value.Sampled value is sent into into reference voltage adjusting module, the reference voltage of existing CCM is carried out
Then reference voltage level after sampled value and renewal is sent into drive module by adjustment.Final drive module is according to sampled value and more
Reference voltage level after new is adjusted correspondingly, and exports the Duty waveforms of regulating switch power main switch.
Claims (2)
1. it is a kind of improve primary side feedback flyback sourse high power work constant pressure sampling precision method, it is characterised in that：In former limit
Feed back under main topological structure, configuration information acquisition module, mode decision module, digital ramp occur module, comparator module, tiltedly
Slope sampling module and reference voltage adjusting module constitute closed loop system with controlled Switching Power Supply.Information acquisition module is auxiliary to former limit
The electric resistance partial pressure helped on winding carries out information gathering；In the assists winding that mode decision module is collected according to information acquisition module
Voltage waveform information carry out mode decision, judge that current system is operated in DCM patterns or CCM patterns；Digital ramp is sent out
Raw module produces corresponding digital ramp according to the different mode of operation that mode decision module is judged, produces under DCM patterns
Sawtooth waveforms, produces monocline slope digital wave under CCM patterns；In the assists winding that information acquisition module is collected by comparator module
The digital ramp that voltage waveform Vsense and digital ramp occur module generation is compared, and the square wave that relatively will be obtained later
Information transmission is to slope sampling module.Slope sampling module is according to comparator module, mode decision module and information gathering mould
The information of block output, is sampled using corresponding method under different mode of operations, is obtained high-precision sampled value；And
Sampled value is sent to into reference voltage adjusting module in ccm mode, under CCM patterns, reference voltage adjusting module is by insertion
In the DCM cycles, constantly update the reference voltage under CCM patterns.Switching Power Supply main switch is regulated eventually through drive module
PWM waveform, realize constant pressure export.
2. the method for improving primary side feedback flyback sourse high power work constant pressure sampling precision according to claim 1, wraps
Include following steps：
1) information acquisition module carries out information gathering to the electric resistance partial pressure in former limit assists winding, obtains the voltage after electric resistance partial pressure
Waveform Vsense；
2) mode decision module receives the voltage waveform collected by information acquisition module, judges the mode of operation of system：If defeated
Go out reference value of the voltage more than setting, explanation system is operated in CCM patterns, otherwise it is assumed that system is operated in DCM patterns；
3) there is the pattern information that module reception pattern judge module sends in digital ramp, be produced according to system mode of operation instantly
The corresponding digital ramp of life：Sawtooth waveforms is produced under DCM patterns；Monocline slope digital wave is produced under CCM patterns；
4) there is module output in the voltage waveform Vsense of comparator module receive information acquisition module output and digital ramp
Digital ramp, is compared using comparator, and voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator " "
End, obtains square wave more afterwards, square wave is exported；
5) slope sampling module receives the comparison information of comparator module output and the voltage waveform of information acquisition module output
Vsense information and the mode decision information of mode decision module output, obtain current sampled value：
Under DCM patterns, the knee value of voltage waveform Vsense is best able to accurately reflect current output voltage values, during sampling
Strive for obtaining the knee value of voltage waveform Vsense, therefore, take in the intersection point of sawtooth waveforms rising edge and voltage waveform Vsense
Intersection value near voltage waveform Vsense corner position is sampled value, and then obtains current output voltage values；
Under CCM patterns, the unique intersection value for taking monocline slope digital wave with voltage waveform Vsense is sampled value, and then obtains current
Output voltage values；
6) reference voltage adjusting module in ccm mode, receives the sampling value information of slope sampling module output, by insertion
The sampled value in DCM cycles is contrasted with the reference value of setting, the reference voltage level according to the error of gained to CCM patterns instantly
It is adjusted；
7) reference voltage adjusting module exports the Duty waveforms of regulating switch power main switch by drive module.
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| CN113765394A (en) * | 2021-08-23 | 2021-12-07 | 南京理工大学 | Primary side feedback converter and switch control method |
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