CN106533205B - A method of primary side feedback flyback sourse is improved in pressure constant state down-sampling precision - Google Patents
A method of primary side feedback flyback sourse is improved in pressure constant state down-sampling precision Download PDFInfo
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- CN106533205B CN106533205B CN201610940902.2A CN201610940902A CN106533205B CN 106533205 B CN106533205 B CN 106533205B CN 201610940902 A CN201610940902 A CN 201610940902A CN 106533205 B CN106533205 B CN 106533205B
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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 kind of methods improving primary side feedback flyback sourse constant pressure sampling precision, for defect existing for the traditional constant pressure sampling policy of high-power lower primary side feedback flyback sourse, abandon CCM (continuous current mode) the grab sampling strategies of traditional analog form and DCM (discontinuous conduct mode) sampling policy that number is approximant, it is proposed a kind of digital ramp method of sampling, in conjunction with comparator, sampled in dcm operating modes with sawtooth wave；It is sampled with monocline slope digital wave under CCM operating modes, and reference voltage is combined to adjust, by being inserted into the DCM periods, constantly updated the reference voltage under CCM patterns, improve sampling precision and constant-voltage characteristic.The present invention uses flexible digital sample strategy, the effect that constant pressure precision is ± 2% can be obtained, to improve the constant-voltage characteristic of high-power lower primary side feedback flyback converter.
Description
Technical field
The present invention relates to isolation type switching power supply converters more particularly to a kind of raising primary side feedback flyback sourse in constant pressure
Digital sample method under state is suitable for primary side feedback flyback sourse when high power work.
Background technology
With the fast development of home electronics, the demand to efficient power also increasingly improves, and causes AC-DC power supplys
The fast development of converter.The development of electronic equipment proposes AC-DC supply convertors new index, 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 in structure, at
The advantages that this is low, wide input range, is widely used in supply convertor.With the raising of flyback sourse output power, big work(
Sampling under rate under flyback sourse constant voltage mode gradually highlights.First, CCM (electric currents are must be introduced under high-power
Continuous mode), and the sampling under traditional CCM patterns mostly uses ADC grab samplings and adjusts the strategy being combined with reference voltage,
The sample mode load regulation of this simulation is larger, and reaction speed is slow, of high cost, there is drift, and dumb.Secondly, existing
The sample mode for high-power lower DCM (discontinuous conduct mode) pattern having mostly uses digital two-wire sampling policy, due to high-power
The slope of lower primary side auxiliary winding waveform is gentle and the waveform after inflection point is excessively steep, causes the slope condition of sampling undesirable,
Adjustable extent is narrow, and precision is not high.
Referring to Fig. 1, it show a kind of common primary side feedback inverse-excitation type electricity using two-wire sampling policy in the prior art
Source converter.The switching power converters acquire voltage waveform of the primary side auxiliary winding after electric resistance partial pressure first
Vsense, then by this voltage waveform compared with Vref1 (reference voltage 1) and Vref2 (reference voltage 2) combination for having fixed pressure difference
Device is compared, and corresponding off time t is calculatedgap, by with reference value trefComparison obtains error amount, then passes through 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, sampling policy shown in Fig. 2 is convenient to be applicable in.Profit
It, since sample waveform slope is different before and after inflection point, can be adopted with the particularity of corner position by setting two-wire gap pressure difference
The difference of sample to off time keep to move up and down two-wire always near corner position, and inflection point is in DCM states
Under can be accurately obtained output voltage values, therefore scheme is suitable.But in high-tension high-power, the sampling policy is no longer suitable
With.It such as Fig. 3, show in the case of high-tension high-power, the oscillogram of two-wire sampling policy is used under DCM patterns.It samples at this time
Waveform is gentle, slope is small, and waveform is steep after inflection point, and slope is very big, and the slope condition of two-wire sampling policy is undesirable, causes
Sampling precision is not high, inflection point follows effect poor, causes the closed loop stability of system and voltage regulation performance poor.
Invention content
In the case of existing high-tension high-power, flyback sourse is in the defect of pressure constant state down-sampling low precision, sheet
Invention provides a kind of digital sample method improving primary side feedback flyback sourse under pressure constant state, is sampled by analyzing influence
The factor of precision, is sampled with sawtooth wave in dcm operating modes；It is carried out with monocline slope digital wave under CCM operating modes
It samples and reference voltage is combined to adjust, by being inserted into the DCM periods, constantly update the reference voltage under CCM patterns, improve big work(
Sampling precision and constant-voltage characteristic under rate flyback sourse constant pressure.By finally emulating and testing, it was found that, constant pressure can be obtained
It is anti-further to expand primary side to improve the constant-voltage characteristic of high-power lower inverse excitation type converter for the effect that precision is ± 2%
Present application of the inverse-excitation type switch power-supply under high-power.
For achieving the above object, the present invention uses following technical scheme：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, setting information acquires mould
Module, comparator module, slope sampling module, reference voltage adjustment module and drive occur for block, mode deciding module, digital ramp
Dynamic model block constitutes closed-loop system with controlled Switching Power Supply；Information acquisition module carries out the electric resistance partial pressure in primary side auxiliary winding
Information collection；Mode deciding module carries out pattern according to the voltage waveform information in the collected auxiliary winding of information acquisition module
Judge, judges that current system is operated in DCM patterns or CCM patterns；Module occurs for digital ramp according to mode deciding module
The different operating modes judged generate corresponding digital ramp, and sawtooth wave is generated under DCM patterns,
Monocline slope digital wave is generated under CCM patterns；Comparator module will be in the collected auxiliary winding of information acquisition module
Voltage waveform Vsense and digital ramp the digital ramp that module generates occurs and is compared, and will relatively obtained side later
Wave information is transmitted to slope sampling module, and slope sampling module is according to comparator module, mode deciding module and information collection
The information of module output, is sampled using corresponding method, obtains high-precision sampled value under different working modes；
The sampled value is transferred directly to drive module in dcm mode, reference voltage adjustment module does not work；In ccm mode will
The sampled value is transmitted to reference voltage adjustment module, and reference voltage adjusts module by being inserted into the DCM periods, constantly updates CCM moulds
Reference voltage under formula is regulated the PWM waveform of Switching Power Supply main switch eventually by drive module, realizes that constant pressure is defeated
Go out.
Include the following steps：
1) information acquisition module carries out information collection to the electric resistance partial pressure in primary side auxiliary winding, after obtaining electric resistance partial pressure
Voltage waveform Vsense；
2) mode deciding module is received by the collected voltage waveform of information acquisition module, judges the operating mode of system：
If output voltage is more than the reference value of setting, illustrate that system is operated in CCM patterns, otherwise it is assumed that system is operated in DCM patterns；
3) pattern information that module reception pattern judgment module is sent out occurs for digital ramp, according to the Working mould of system instantly
Formula generates corresponding digital ramp：Sawtooth wave is generated under DCM patterns；Monocline slope digital wave is generated under CCM patterns；
4) module occurs for the voltage waveform Vsense of comparator module reception information acquisition module output and digital ramp defeated
The digital ramp gone out, is compared using comparator, and voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator
"-" end, obtains square wave more afterwards, and square wave is exported；
5) slope sampling module receives the voltage wave of the comparison information and information acquisition module output of comparator module output
Shape Vsense information and the mode decision information of mode deciding 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 when sample, therefore, take the friendship of sawtooth wave rising edge and voltage waveform Vsense
Near the intersection value of voltage waveform Vsense corner positions it is sampled value in point, and then obtains current output voltage values；
Under CCM patterns, it is sampled value to take monocline slope digital wave and unique intersection value of voltage waveform Vsense, and then is obtained
Current output voltage values；
6) under CCM patterns, reference voltage adjusts the sampling value information that module receives the output of slope sampling module, by insertion
The sampled value in DCM periods and the reference value of setting are compared, according to the error of gained to the reference voltage level of CCM patterns instantly
It is adjusted；
7) under CCM patterns, reference voltage adjusts module and exports updated reference voltage level, is exported and is adjusted by drive module
Control the Duty waveforms of Switching Power Supply main switch；Under DCM patterns, slope sampling module output sampling value information is directly to driving mould
Block exports the Duty waveforms of regulating switch power main switch.
Advantages of the present invention and remarkable result：High-power lower traditional DCM mostly uses the approximant sampling policy of number, sampling
Precision is low.Traditional CCM mostly uses ADC grab sampling strategies, and of high cost, reaction is slowly, adjustability is poor, there is drift, by environment
Factor influences big.The present invention is put for defect existing for the traditional constant pressure sampling policy of high-power lower primary side feedback flyback sourse
Abandon CCM (continuous current mode) the grab sampling strategies of traditional analog form and DCM (the discontinuous current moulds that number is approximant
Formula) sampling policy, propose that a kind of digital ramp method of sampling is adopted with sawtooth wave in dcm operating modes in conjunction with comparator
Sample；It is sampled with monocline slope digital wave under CCM operating modes, and adjusts and organically combine with reference voltage, in conjunction with reference to electricity
Pressure adjustment constantly updates the reference voltage under CCM patterns, improves sampling precision and constant-voltage characteristic by being inserted into the DCM periods.
The digital sample strategy that the present invention uses, speed is fast and very flexible, is effectively improved sampling precision, can obtain constant pressure essence
The effect that degree is ± 2%, to improve the constant-voltage characteristic of high-power lower primary side feedback flyback converter.
Description of the drawings
Fig. 1 is a kind of system diagram of common primary side feedback flyback power supply converter in the prior art；
Fig. 2 is DCM two-wire sampling policy oscillograms under a kind of common low-power flyback sourse constant pressure in the prior art；
Fig. 3 is DCM two-wire sampling policy oscillograms under a kind of common high-power flyback sourse constant pressure in the prior art；
The whole of constant pressure sampling realizes system diagram when Fig. 4 is primary side feedback flyback sourse high power work of the present invention；
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 that reference voltage adjusts under CCM patterns in the present invention；
Fig. 8 is the overall flow figure of digital sample strategy of the present invention.
Specific implementation mode
From following discussion it should be noted that the alternative embodiment of structures and methods disclosed herein will be easy to be known
The feasible alternative that Wei not may be utilized without departing substantially from the principle of the disclosure.
Now with detailed reference to several embodiments of the disclosure, example is illustrated in the accompanying drawings.It can as long as noticing
Row can use similar or identical reference numeral and its that can indicate similar or identical function in figure.Attached drawing merely for
The purpose of explanation describes embodiment of the disclosure.Those skilled in the art from being described below it will readily recognize that, do not carry on the back
The alternative embodiment of structures and methods illustrated herein may be used in the case of from the principle of embodiment described herein.
Below in conjunction with drawings and examples, clear, complete description is carried out to technical scheme of the present invention.
Such as Fig. 1, the main topological structure of flyback power supply and the structure chart of sampling module are given.Acquisition primary side auxiliary 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 difference and
Vref2 (reference voltage 2) is compared by comparing device, and the output signal of two groups of comparators is input to time computing module,
And then obtain off time tgap；Again by tgapIt is input to error generation module, passes through the reference value Δ t with off timerefIt compares
Error amount is obtained, then error correction is carried out by control module, exports revised Vref1 (reference voltage 1) and Vref2 (references
Voltage 2), while required primary side peak value stop voltage Vpeak and switch periods Ts is calculated, finally obtained by drive module
To the PWM waveform of regulating switch power main switch, 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 the prior art.Profit
With the particularity of corner position, the gap pressure difference between setting two-wire Vref1 (reference voltage 1) and Vref2 (reference voltage 2)
Vgap, since sample waveform slope is different before and after inflection point, it is thus possible to off time Tgap is sampled, it is double to move up and down
Line makes two-wire keep always near corner position, and inflection point is under DCM states can be accurately obtained output voltage values, thus
The sampling policy is very applicable under low-power.
Fig. 3 is DCM two-wire sampling policy oscillograms under a kind of common high-power flyback sourse constant pressure in the prior art.With
Situation under low-power shown in Fig. 2 is compared, it is high-power under voltage waveform is gentle, slope is small, and waveform is steep after inflection point, tiltedly
Rate is very big, and the slope condition of two-wire sampling policy is undesirable, and, inflection point not high so as to cause sampling precision follows effect poor, causes
The closed loop stability and voltage regulation performance of system are poor.
The whole of constant pressure sampling realizes system diagram when Fig. 4 is primary side feedback flyback sourse high power work of the present invention.In original
Side is fed back under main topological structure, and information acquisition module carries out information collection to the electric resistance partial pressure in primary side auxiliary winding, and pattern is sentenced
Disconnected module carries out mode decision using collected voltage waveform information, judges that current system is operated in DCM patterns or CCM
Pattern；Digital ramp occurs module and generates corresponding digital ramp according to different operating modes, and sawtooth is generated under DCM patterns
Wave generates monocline slope digital wave under CCM patterns；Voltage waveform and digital ramp are compared by comparator module, and will be compared
Later the information obtained is transmitted to slope sampling module；Slope sampling module according to comparator module, mode deciding module and
The information that information acquisition module provides is sampled using corresponding method under different working modes, obtains high-precision
Sampled value, the sampled value is transferred directly to drive module in dcm mode, reference voltage adjustment module does not work；In CCM
The sampled value is transmitted to reference voltage under pattern and adjusts module, reference voltage adjusts module by being inserted into the DCM periods, constantly more
Reference voltage under new CCM patterns；It is regulated the PWM waveform of Switching Power Supply main switch eventually by drive module, realizes
Constant pressure exports.
Such as Fig. 5, for sample waveform inflection point front slope it is small and after inflection point waveform is steep, the prodigious problem of 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 is obtained when sampling as far as possible.So taking sawtooth wave rising edge and primary side under DCM patterns
In the intersection point of auxiliary winding voltage waveform Vsense near the intersection value of Vsense corner positions be sampled value.
Module occurs using the digital ramp in Fig. 4 and generates a sawtooth wave to successively decrease step by step as shown in Figure 5, sawtooth wave
Amplitude, ao V be fixed.Voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator "-" end, and sawtooth wave exists
In uphill process can and the waveform of Vsense have an intersection point, each intersection point of sawtooth wave and Vsense can cause comparator to export
The saltus step of value Vref_comp, the rising edge of sawtooth wave and the intersection point of Vsense enable comparator output valve Vref_comp be become from 0
1, the failing edge of sawtooth wave and the intersection point of Vsense enable comparator output valve Vref_comp become 0 from 1.According to the defeated of comparator
The rising edge of sawtooth wave and the intersection point of Vsense can be captured by going out 0 → 1 hopping edge, and each intersection value is stored in register
In, V[1]For the value of first intersection point, V[2]For the value of second intersection point, and so on, V[n]For the value of the last one intersection point.
After sampling starts, in the failing edge of the output valve Vref_comp of comparator, i.e., whenever the output Vref_ of comparator
Comp from 1 → 0 when, counter starts to count from 0, in the time inside counting of Vref_comp=0, whenever Vref_comp value from
Then count value is stored in register when 0 → 1 saltus step, respectively：T[1],T[2],T[3],…,T[n].Wherein, T[1]It is
The count value of the period of one Vref_comp=0, T[2]For the count value of the period of second Vref_comp=0, class successively
It pushes away, T[n]For the count value of the period of the last one Vref_comp=0.
As shown in the sampling situations 1 of Fig. 5, if T[n-1]=T[n]Or both value differ very little, then explanation is last
One intersection point takes the value V[ of the last one intersection point near inflection point;n]For sampled value；As shown in sampling situations 2 in Fig. 5, if T
[n]With T[n-1]Between differ larger, then illustrate that the last one intersection point is under inflection point, and due to Vsense after inflection point
Waveform is steep, and slope is very big, causes the value of the last one intersection point to deviate knee value larger.At this point, penultimate intersection point near
Nearly inflection point, so the value V[ of inverted second intersection point;n-1]For sampled value.Specifically judgment rule is：If T[n-1]≥2*
T[n], then the value V[ of inverted second intersection point;n-1]For sampled value；If T[n-1]< 2*T[n], then the last one intersection point is taken
Value V[n]For sampled value, and then obtain current output voltage values.
By choosing the slope and Δ V of suitable sawtooth wave, choose as indicated by the arrows in the figure to the friendship near inflection point
Point value is sampled value to get to the digital value of accurate DCM corner positions, and then obtains current output voltage values, to gram
Take the problem that slope is small, the steep sampling precision brought is not high.
Fig. 6 is the key waveforms figure of digital sample under CCM patterns in the present invention, and monocline slope digital wave is used under CCM patterns
The method of sampling occurs module using the digital ramp in Fig. 4 and generates a monocline slope as shown in FIG. 6 digital waveform, passes through ratio
Compared with the intersection point that device module can obtain digital ramp and sample waveform, and the intersection point is unique, as final sampled value.It is this to adopt
Quadrat method is simple, and can improve the accuracy of sampling, facilitates and adjusts module in conjunction with subsequent reference voltage, improves under CCM
Constant pressure effect.
Fig. 7 is the key waveforms figure that reference voltage adjusts under CCM patterns in the present invention, and the present invention will count in ccm mode
Word slope is sampled to be combined togather with reference voltage adjustment.As shown, dotted portion is actual waveform, bold portion is reason
Think waveform.It is inserted into ccm mode a DCM period, which is that will be obtained after itself cycle stretch-out in the previous CCM periods
It arrives, so the knee voltage value in the DCM periods corresponds to output voltage values.It samples to obtain turning for DCM periods by sawtooth wave
Point voltage value, and there are one ideal values, i.e. reference value VREF for the knee voltage value under constant voltage mode.By sampled value and reference value
It is compared, and the reference voltage under CCM patterns is adjusted according to the difference of the two.And then is changed by control algolithm and adjusted
The PWM waveform for controlling Switching Power Supply main switch makes next CCM sampled values approach updated reference voltage level, realizes constant pressure
Stablize output.
As shown, actual waveform is higher than ideal waveform, then the knee voltage value in the DCM periods being inserted into is higher than reference value
VREF, and this just illustrates that the reference voltage under CCM is excessively high, need the amplitude turned down, and turned down be actual sample value with
Difference between reference value.The PWM waveform for changing regulating switch power main switch by control algolithm, makes sampled value gradually drop
It is low, new reference voltage is approached, realizes constant-pressure stable output.
Fig. 8 is the overall flow figure of digital sample strategy of the present invention, as shown, acquiring the voltage in auxiliary winding first
Waveform judges that the current operating mode of system is CCM or DCM followed by mode decision.
If system is operated in DCM patterns instantly, generate digital saw-tooth wave, so with collected voltage waveform
Vsense is compared by comparing device, and the information after comparison is sent to sampling module together with voltage waveform, is taken on sawtooth wave
Rise along in the intersection point of voltage waveform Vsense near the intersection value of voltage waveform Vsense corner positions 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, generate monocline slope digital wave, so with collected voltage waveform
Vsense is compared by comparing device, and the information after comparison is sent to sampling module together with voltage waveform, is uniquely handed over
The voltage value of point, as sampled value.Sampled value is sent into reference voltage and adjusts module, the reference voltage of existing CCM is carried out
Then sampled value and updated reference voltage level are 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. a kind of method improving primary side feedback flyback sourse high power work constant pressure sampling precision, it is characterised in that：In primary side
Feed back under main topological structure, setting information acquisition module, mode deciding module, digital ramp occur module, comparator module, tiltedly
Slope sampling module, reference voltage adjustment module and drive module constitute closed-loop system with controlled Switching Power Supply；Information collection mould
Block carries out information collection to the electric resistance partial pressure in primary side auxiliary winding；Mode deciding module is collected according to information acquisition module
Voltage waveform information in auxiliary winding carries out mode decision, judges that current system is operated in DCM patterns or CCM patterns；
Digital ramp occurs module and generates corresponding digital ramp, DCM according to the different operating modes that mode deciding module is judged
Sawtooth wave is generated under pattern, and monocline slope digital wave is generated under CCM patterns；Comparator module is collected auxiliary by information acquisition module
The voltage waveform Vsense and digital ramp helped on winding occurs the digital ramp that module generates and is compared, and will be after comparison
Obtained square wave information is transmitted to slope sampling module, slope sampling module according to comparator module, mode deciding module and
The information of information acquisition module output, is sampled using corresponding method under different working modes, obtains high-precision
Sampled value；The sampled value is transferred directly to drive module in dcm mode, reference voltage adjustment module does not work；In CCM
The sampled value is transmitted to reference voltage under pattern and adjusts module, reference voltage adjusts module by being inserted into the DCM periods, constantly more
Reference voltage under new CCM patterns, the PWM waveform of Switching Power Supply main switch is regulated eventually by drive module, is realized
Constant pressure exports.
2. the method according to claim 1 for improving primary side feedback flyback sourse high power work constant pressure sampling precision, packet
Include following steps：
1) information acquisition module carries out information collection to the electric resistance partial pressure in primary side auxiliary winding, obtains the voltage after electric resistance partial pressure
Waveform Vsense；
2) mode deciding module is received by the collected voltage waveform of information acquisition module, judges the operating mode of system：If defeated
Go out the reference value that voltage is more than setting, illustrates that system is operated in CCM patterns, otherwise it is assumed that system is operated in DCM patterns；
3) pattern information that module reception pattern judgment module is sent out occurs for digital ramp, is produced according to the operating mode of system instantly
Raw corresponding digital ramp：Sawtooth wave is generated under DCM patterns；Monocline slope digital wave is generated under CCM patterns；
4) comparator module receives the voltage waveform Vsense of information acquisition module output and module output occurs for digital ramp
Digital ramp is compared using comparator, and voltage waveform Vsense connects comparator "+" end, and digital ramp connects comparator "-"
End, obtains square wave, square wave is exported more afterwards；
5) slope sampling module receives the voltage waveform of the comparison information and information acquisition module output of comparator module output
Vsense information and the mode decision information of mode deciding 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, when sampling
Strive for obtaining the knee value of voltage waveform Vsense, therefore, in the intersection point for taking sawtooth wave rising edge and voltage waveform Vsense
Intersection value near voltage waveform Vsense corner positions is sampled value, and then obtains current output voltage values；
Under CCM patterns, it is sampled value to take unique intersection value of monocline slope digital wave and voltage waveform Vsense, and then is obtained current
Output voltage values；
6) under CCM patterns, reference voltage adjusts the sampling value information that module receives the output of slope sampling module, by the DCM of insertion
The sampled value in period and the reference value of setting are compared, according to the error of gained to the reference voltage levels of CCM patterns instantly into
Row adjustment；
7) under CCM patterns, reference voltage adjusts module and exports updated reference voltage level, is opened by drive module output regulation and control
Close the Duty waveforms of power main switch；Under DCM patterns, sampling module output sampling value information in slope is defeated directly to drive module
Go out the Duty waveforms of regulating switch power main switch.
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