CN206023578U - A kind of non-isolated high step-up ratio DC converter of modified - Google Patents
A kind of non-isolated high step-up ratio DC converter of modified Download PDFInfo
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- CN206023578U CN206023578U CN201621104090.XU CN201621104090U CN206023578U CN 206023578 U CN206023578 U CN 206023578U CN 201621104090 U CN201621104090 U CN 201621104090U CN 206023578 U CN206023578 U CN 206023578U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a kind of non-isolated high step-up ratio DC converter of modified, including direct-current input power supplying, the direct-current input power supplying positive pole connects two branch roads, tie point connects one end of load capacitance through the first electric capacity, the first diode, and the second branch road is through the first inductance, the other end of the second capacitance connection load capacitance；Second electric capacity is connected with power cathode by the second diode, and second diode be connected with the tie point of the first inductance and the second electric capacity by a switching tube with the junction of power cathode, be just connected to the 3rd diode between the tie point of the tie point and the first electric capacity and the first diode；The one or both ends of load capacitance are provided with filter inductance.The utility model can effectively suppress current spike, and system robustness is good, dynamic response is rapid.Have broad application prospects in the boosting of photovoltaic DC-to-AC converter prime.
Description
Technical field
The utility model is related to a kind of non-isolated high step-up ratio DC converter of modified.
Background technology
In photovoltaic generating system, photovoltaic battery panel is the part for converting the solar into electric energy, and its output voltage is general
DC voltage between 25V～45V, needed for far below combining inverter.Under traditional approach, grid-connected in order to meet
Required voltage, typically connects polylith photovoltaic battery panel as the input of inverter.But the difference due to photovoltaic battery panel
The factor such as what property, partial phantom were blocked, causes the output energy of photovoltaic array to substantially reduce.
In recent years, it is to solve the problems, such as that photovoltaic battery panel series connection power output is low, increasing scholar proposes to use light
The input as system in parallel of volt cell panel.As the output voltage of photovoltaic battery panel is far below grid-connected required DC voltage,
So needing the DC converter of a high step-up ratio to raise the voltage of the output of photovoltaic battery panel.Traditional liter piezoelectricity
There are Boost circuit, three level Boost circuits etc. in road, but in the case of high step-up ratio, switching tube dutycycle is close to 1, and converter is imitated
Rate is low.
In isolated application, high step-up ratio realized by the transformer that can select the high turn ratio, but transformer leakage inductance is big, can produce
The larger peak voltage of life, increases device switch stress, and reduces efficiency.Using multistage boosting knot in non-isolation type converter
Structure can also realize high step-up ratio, but system effectiveness is the product of stage efficiency, and therefore overall efficiency can be restricted.Using switch
Capacitance network realizes that high step-up ratio is a kind of effective measures, but which has very big dash current, and easy generating device is damaged, electricity
The problems such as magnetic poor compatibility.
Prior art generally combines that Switching capacitors voltage transfer ratio is high and that non-isolation type output voltage is controllable is excellent
Point, is combined, and its basic ideas is：Insertion switch electric capacity, turns off device in switching tube, is charged for which using inductance in parallel；
During switch conduction, capacitances in series is got up to power to the load, so as to improve the step-up ratio of converter, reduce dutycycle, drop
Low switch pipe ripple current and cut-off current, improve efficiency.When capacitances in series powers to the load, equivalent circuit is many overvoltage
Source-series, impedance loop is very little, can produce peak current, affects system control and Electro Magnetic Compatibility.
Utility model content
The utility model is in order to solve the above problems, it is proposed that a kind of non-isolated high step-up ratio DC converting of modified
Device, the utility model efficiently solve the problems, such as current spike by introducing a filter inductance in the loop, and on this basis
Using peak value comparison method, the stability contorting of the output voltage to system is realized.
To achieve these goals, the utility model is adopted the following technical scheme that：
A kind of non-isolated high step-up ratio DC converter of modified, including direct-current input power supplying, the direct current input electricity
Source positive pole connects two branch roads, and tie point connects one end of load capacitance, the second branch road through the first electric capacity, the first diode
Through the first inductance, the other end of the second capacitance connection load capacitance；
Second electric capacity is connected with power cathode by the second diode, and the connection of the second diode and power cathode
Place is connected with the tie point of the first inductance and the second electric capacity by a switching tube, the tie point and the first electric capacity and the one or two
Threeth diode is just being connected between the tie point of pole pipe；
The one or both ends of load capacitance are provided with filter inductance.
The value of first electric capacity, the second electric capacity and the first inductance is flat according to inductance voltage-second balance principle and electric capacity ampere-second
Weighing apparatus principle is tried to achieve.
The filter inductance leaches peak current, and its value is less than the first inductance.
When the two ends of the load capacitance are provided with filter inductance, the inductance value of two filter inductances is load capacitance one
The half of the inductance value of the filter inductance during setting filter inductance of end.
The switching tube is FET.
Peak current controller is connected between the grid and source electrode of the switching tube.
The load capacitance two ends are provided with voltage collector, and the voltage collector is connected with comparator, the comparison
The output end connection compensator of device, the output end of the compensator and the input of peak current controller.
The beneficial effects of the utility model are：
(1) operation principle by analysis based on I types high step-up ratio converter derived from Buck/Buck-Boost, finds
There is peak current in its work loop, the problem is solved by increasing a filter inductance in the loop, but change little effect
Fruit is prominent, while cost input is little.
Description of the drawings
Fig. 1 is that prior art is based on I types high step-up ratio converter derived from Buck/Buck-Boost；
Fig. 2 (a) is the switching tube ON operation mould based on I types high step-up ratio converter derived from Buck/Buck-Boost
Formula；
Fig. 2 (b) is the switching tube shut-off Working mould based on I types high step-up ratio converter derived from Buck/Buck-Boost
Formula；
Fig. 3 is equivalent circuit diagram when switching tube of the present utility model is turned on；
Fig. 4 is of the present utility model improved based on I types high step-up ratio converter derived from Buck/Buck-Boost；
Fig. 5 opens equivalent circuit diagram for switching tube after improvement of the present utility model；
Fig. 6 is inductance L after improvement of the present utility model2Afterflow loop figure；
Fig. 7 is of the present utility model improved based on I types high step-up ratio convertor controls derived from Buck/Buck-Boost
Block diagram；
Fig. 8 is slope compensation schematic diagram of the present utility model；
Fig. 9 is frequency response of the control electric current to output voltage；
Figure 10 is voltage compensator frequency response curve；
Figure 11 is based on I types high step-up ratio converter emulation experiment waveform signal derived from Buck/Buck-Boost for improving
Figure；
Figure 12 (a) is dynamic response schematic diagram of the input between 38V and 30 during saltus step；
Figure 12 (b) is the dynamic response schematic diagram of input saltus step between 38V and 45V；
Figure 13 is the dynamic response schematic diagram for being supported on fully loaded saltus step and semi-load between；
Placement location schematic diagrames of Figure 14 (a)-(d) for inductance.
Specific embodiment：
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 be prior art proposed based on I types high step-up ratio converter derived from Buck/Buck-Boost.Inductance
L1It is operated under continuous current state, according to switching tube ON/OFF, circuit can be divided into two kinds of working conditions.Work as switching tube
During conducting, shown in its equivalent circuit such as Fig. 2 (a), direct-current input power supplying UgFor inductance L1Charge, electric capacity C1、C2With power supply UgSeries connection
For load and output filter capacitor CfPower supply；When switching tube is turned off, shown in its equivalent circuit such as Fig. 2 (b), inductance L1With direct current
Input power is electric capacity C1、C2Charge, while output filter capacitor is load supplying.
Improvement preceding switch pipe can be seen that in the closure conducting of HF switch each time by Fig. 2 a, current path I is main
, but due to there is inductance L1 in loop, the change of electric current will not be mutated, and power switch pipe current stress is in controlled area charactert.
But output voltage ripple is little when being commonly designed, current path II would generally be ignored, so in the case where load is heavier,
The voltage difference existed between output voltage and input voltage can increase, and loop II internal resistances are very little, and less pressure reduction also can reach
Higher current peak, especially 1 current value of loop are higher, the current spike after both superpositions, easily cause anti-conveyance capacity
Poor high frequency switching device failure.For eliminating potential current spike, increasing inductance can be with this problem of effectively solving.
But increase the impact difference that the placement location of inductance is different, to power switch pipe in major loop：Such as Figure 14 (a)～figure
14 (c) has identical effect, but selects Inductive position in Figure 14 (d), and when power switch pipe is turned off, voltage stress is high, to two poles
The switching speed requirements of pipe D1 are high.
Therefore, the utility model requires filter inductance position for Figure 14 (a)～Figure 14 (c), the double inductance values of wherein Figure 14 (c)
Can halve.
During circuit steady operation, according to the voltage-second balance principle of inductance, it can be deduced that：
UgDTs+(-Uc1)(1-D)Ts=0 (1)
UgDTs+(Ug-Uc2)(1-D)Ts=0 (2)
In formula, dutycycles of the D for switching tube conducting, Uc1, Uc2Respectively electric capacity C1, C2Both end voltage, respectively：
During switching tube is turned on, electric capacity C1、C2With power supply UgConnect as load and output filter capacitor CfPower supply, output
Voltage is three's voltage sum, and its value is：
By above-mentioned analysis, it can be seen that during switching tube is turned on, electric capacity C1、C2With power supply UgAfter series connection, with CfAnd
Load R is in parallel, is which charges.
During this, can be by C1、C2With power supply UgIt is equivalent to electric capacity Cin, with Cf, R in parallel, equivalent circuit such as Fig. 3 institutes
Show, wherein RonFor electric capacity, power supply, diode series resistance sum, UinFor capacitance voltage and supply voltage sum.
Ron=Rc1+Rc2+RQon+RUg+RD0(6)
Uin=Uc1+Uc2+Ug(7)
Flow through RonElectric current ionFor：
When switching tube is turned off, inductance is electric capacity C1、C2Charge, capacitance voltage U can be madeC1、UC2Raise, UinIncrease, be higher than
Average voltage Uo；Electric capacity CfPower to the load, its voltage U can be madeoutDecline, less than average voltage Uo.This causes in UinWith UoutIt
Between there is voltage difference, conducting resistance R of looponVery little, so the current spike of moment can be produced in switching tube conducting moment,
Affect normal operation circuit.
For solving the problems, such as current spike, as shown in Figure 4.In diode D0Add an inductance afterwards so as to inductance value L2<<
L1, discontinuous current mode is worked in, is only strobed.When switching tube is turned on, ignore conducting loop equivalent resistance, equivalent electric
Road is as shown in figure 5, output current ionRate of change donFor：
When open pipe is disconnected, inductance L2Afterflow, its continuous current circuit are as shown in Figure 6.Output current ionInterconversion rate doffFor：
During stable state, inductance L2Current change quantity is identical in the switch periods of, and don<<doff, time of afterflow is far little
In ON time, so inductance L can be ignored in stable state calculating process2Afterflow process, calculate obtained by each steady-state value with
It is not added with inductance L2Shi Xiangtong.
Peak value comparison method realizes the control exported by converter by the peak point current of controlling switch pipe, with control
Simply, fast response time, the advantages of effectively holding back to switching tube can be realized, be widely used in convertor controls.
For the ease of analysis, system controller design is carried out by taking a high step-up ratio DC-DC converter as an example.System is adopted
Double -loop control, inner ring adopt peak value comparison method, outer shroud to control for voltage, and Fig. 7 is system control block figure.Designed converter
Input voltage be 25～45V, specified input 38V, output voltage 380V, power output 200W, powered resistive load, switching frequency
100KHz.It is required that inductive current ripple is the 20% of its electric current, output voltage ripple is output voltage 1%.According to inductance weber
Equilibrium principle and electric capacity ampere-second equilibrium principle, can calculate inductance, the value of electric capacity and take certain allowance, C1=C2=
3.3uF, Cf=0.33uF, L1=300uH, R=725 Ω；According to analyzing above, L2Only play a part of to leach peak current, its value
Should be far smaller than L1, take L2=10uH.
Peak value comparison method dutycycle be more than 0.5 when system can be made unstable, by add slope compensation can make be
System stable operation, as shown in Figure 8.When system input is 38V, dutycycle D=0.8 can be drawn according to formula [5], need to add
Slope compensation makes system stable operation.Slope compensation slope is chosen for inductive current descending slope, m=mL1D.Inductance L1Mean value
IL1For：
Inductive current descending slope mL1DFor：
In switching tube Q, the electric current rate of rise is inductance L1、L2Electric current rate of rise sum.Inductance L1Electric current rate of rise mL1U
For：
Inductance L2The rate of rise be：
Switching tube Q electric current rates of rise mQFor：
mQ=mL1U+mL2U=5.12A/Ts(15)
Switching tube initial current IQ0Identical with inductance initial current, calculate：
IQ0=IL0=IL-0.1IL=4.74A (16)
At the dTs moment, tube current I is switchedQdTsFor：
IQdTs=IQ0+D*Ts*mQ=8.836A (17)
Control electric current I when can calculate stable state according to Fig. 8cSize is：
IC=IQdTs+D*TS* m=13A (18)
Draw through above-mentioned analysis, systematic steady state control electric current Ic=13A, slope compensation slope-m=-5.27A/Ts.For setting
Meter outer voltage controller, at control electric current steady operation point applies disturbance, measures control electric current iCArrive output voltage Uout's
Frequency response, as shown in Figure 9.
From system frequency response as can be seen that system gain is excessive, there is no cross-over frequency, stability is poor.Using two types
To compensating system, Figure 10 is designed voltage compensator frequency response curve to compensator.After compensation, system cross-over frequency exists
Near 1000Hz, about 70 ° of Phase margin, system stability.DC current gain is infinitely great, can realize that output voltage indifference is controlled.
In order to verify the correctness of set meter systems, system simulation model has been built in simulation of power electronic software Saber,
Adopted simulation parameter is consistent with design parameter above.
When Figure 11 is 38V for input voltage, the improvement using peak value comparison method is based on derived from Buck/Buck-Boost
I type high step-up ratio converter emulation experiment waveforms.It can be seen that system start-up time is less than 1ms, response is rapid.?
The given place of input adds soft starting circuit, makes output non-overshoot.By adding inductance L2Peak current in effective suppression loop, surely
During state, no current spike in loop.
Figure 12 (a), Figure 12 (b) are respectively to improve and are worked as based on I types high step-up ratio converter derived from Buck/Buck-Boost
The dynamic response oscillogram that input switches between 38V, 30V and input is switched between 38V, 45V.Can from figure
Go out, when input voltage fluctuation, system can be reached in 1ms again to be stablized, and Dynamic Regulating Process is short, has good stability.
Figure 13 is fully loaded with and half for improving to be worked as to be supported on based on I types high step-up ratio converter derived from Buck/Buck-Boost
The dynamic response switched between load.It can be seen that system has good load regulation, fast response time.
By operation principle of the analysis based on I types high step-up ratio converter derived from Buck/Buck-Boost, its work is found
Make in loop, the presence of peak current, the problem is solved by increasing a filter inductance in the loop.On this basis, using peak
Value current control mode realizes the stability contorting to converter.Simulation result shows that the solution for being proposed effectively can press down
Current spike processed, system robustness is good, dynamic response is rapid.Before there is wide application in the boosting of photovoltaic DC-to-AC converter prime
Scape.
Although the above-mentioned accompanying drawing that combines is described to specific embodiment of the present utility model, not new to this practicality
The restriction of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability
Various modifications or deform still in protection model of the present utility model that field technique personnel are made by need not paying creative work
Within enclosing.
Claims (7)
1. a kind of non-isolated high step-up ratio DC converter of modified, is characterized in that：Including direct-current input power supplying, the direct current
Input power positive pole connects two branch roads, and tie point connects one end of load capacitance through the first electric capacity, the first diode, the
Two branch roads are through the first inductance, the other end of the second capacitance connection load capacitance；
Second electric capacity is connected with power cathode by the second diode, and the second diode is led to the junction of power cathode
Cross a switching tube to be connected with the tie point of the first inductance and the second electric capacity, the tie point and the first electric capacity and the first diode
Tie point between be just connected to the 3rd diode；
The one or both ends of load capacitance are provided with filter inductance.
2. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 1, is characterized in that：Described first
The value of electric capacity, the second electric capacity and the first inductance is tried to achieve according to inductance voltage-second balance principle and electric capacity ampere-second equilibrium principle.
3. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 1, is characterized in that：The filtering
Inductance leaches peak current, and its value is less than the first inductance.
4. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 1, is characterized in that：The load
When the two ends of electric capacity are provided with filter inductance, when the inductance value of two filter inductances is that load capacitance one end arranges filter inductance
The filter inductance inductance value half.
5. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 1, is characterized in that：The switch
Manage as FET.
6. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 5, is characterized in that：The switch
Peak current controller is connected between the grid and source electrode of pipe.
7. the non-isolated high step-up ratio DC converter of a kind of modified as claimed in claim 1, is characterized in that：The load
Electric capacity two ends are provided with voltage collector, and the voltage collector is connected with comparator, and the output end connection of the comparator is mended
Repay device, the output end of the compensator and the input of peak current controller.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300974A (en) * | 2016-10-08 | 2017-01-04 | 山东大学 | A kind of modified model non-isolated high step-up ratio DC converter and control method |
| CN107359791A (en) * | 2017-07-25 | 2017-11-17 | 华域汽车电动系统有限公司 | A kind of DC/DC translation circuits |
| CN112737306A (en) * | 2020-12-17 | 2021-04-30 | 上海大学 | High-gain bridgeless switched capacitor power factor correction converter |
| CN112953265A (en) * | 2021-03-18 | 2021-06-11 | 上海大学 | Positive output high-gain bridgeless switched capacitor SEPIC PFC converter |
| CN112953263A (en) * | 2021-03-18 | 2021-06-11 | 上海大学 | Negative output high-gain bridgeless switched capacitor SEPIC PFC converter |
-
2016
- 2016-10-08 CN CN201621104090.XU patent/CN206023578U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300974A (en) * | 2016-10-08 | 2017-01-04 | 山东大学 | A kind of modified model non-isolated high step-up ratio DC converter and control method |
| CN106300974B (en) * | 2016-10-08 | 2019-03-22 | 山东大学 | A kind of non-isolated high step-up ratio DC converter of modified and control method |
| CN107359791A (en) * | 2017-07-25 | 2017-11-17 | 华域汽车电动系统有限公司 | A kind of DC/DC translation circuits |
| CN107359791B (en) * | 2017-07-25 | 2023-05-02 | 华域汽车电动系统有限公司 | DC/DC conversion circuit |
| CN112737306A (en) * | 2020-12-17 | 2021-04-30 | 上海大学 | High-gain bridgeless switched capacitor power factor correction converter |
| CN112953265A (en) * | 2021-03-18 | 2021-06-11 | 上海大学 | Positive output high-gain bridgeless switched capacitor SEPIC PFC converter |
| CN112953263A (en) * | 2021-03-18 | 2021-06-11 | 上海大学 | Negative output high-gain bridgeless switched capacitor SEPIC PFC converter |
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