CN107681894A - Combined type buck converter and its parameter determination method - Google Patents
Combined type buck converter and its parameter determination method Download PDFInfo
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- CN107681894A CN107681894A CN201710802951.4A CN201710802951A CN107681894A CN 107681894 A CN107681894 A CN 107681894A CN 201710802951 A CN201710802951 A CN 201710802951A CN 107681894 A CN107681894 A CN 107681894A
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- inductance
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- buck converter
- combined type
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
Abstract
The invention discloses a kind of combined type buck converter and its parameter determination method.Wherein, the combined type buck converter includes：Buck converter BUCK, its input are connected with DC voltage output end, for reducing the output voltage of DC voltage output end；Isolated converter, its input are connected with the output end of booster converter, for being adjusted to the output voltage after reduction.The present invention solves the relatively low technical problem of the buck converter decompression ability provided in correlation technique.
Description
Technical field
It is true in particular to a kind of combined type buck converter and its parameter the present invention relates to voltage changer field
Determine method.
Background technology
Because functional module different in electronic equipment differs to the size requirements of operating voltage, therefore in order to meet difference
The voltage requirements of device element are, it is necessary to select suitable DC-DC converter chip to carry out reliable decompression transformation.It is but existing
The decompression ability of buck converter in technology is relatively low, can not realize larger decompression demand, it is necessary to a kind of decompression energy of design
The stronger voltage changer of power.In addition, the parameter of different components has an impact to converter decompression ability in voltage changer,
But be typically that parameter is chosen by rule of thumb in the prior art, inconvenience the parameters of all components is tested comprehensively with up to
To best antihypertensive effect.
For the relatively low technical problem of the buck converter decompression ability provided in correlation technique, not yet propose at present effective
Solution.
The content of the invention
The embodiments of the invention provide a kind of combined type buck converter and its parameter determination method, at least to solve correlation
The buck converter provided in technology is depressured the relatively low technical problem of ability.
One side according to embodiments of the present invention, there is provided a kind of combined type buck converter, combined type decompression become
Parallel operation includes：Buck converter BUCK, its input is connected with DC voltage output end, for reducing DC voltage output end
Output voltage；Isolated converter, its input are connected with the output end of booster converter, for the output electricity after reduction
Pressure is adjusted.
Further, buck converter includes：FET M1, its first end are connected with the positive pole of DC voltage output end
Connecing, its second end is connected with the first power supply V1 first end, wherein, the first power supply V1 the second end ground connection；Inductance L1, it
One end is connected with FET M1 the 3rd end；Diode D1, its negative pole are connected with FET M1 the 3rd end, and it is just
Pole is grounded；Electric capacity C1, its first end are connected with inductance L1 the second end, its second end ground connection.
Further, FET M1 conduction ratio is imitated multiple conduction ratio numerical value by using default simulation software
The operation result of true computing determines.
Further, isolated converter is forward converter or inverse excitation type converter.
Further, in the case where isolated converter is forward converter, forward converter includes：Inductance L2,
Its first end is connected with diode L1 the second end；FET M2, its first end are connected with inductance L2 the second end, its
Second end is connected with second source V2, its 3rd end ground connection；Diode D2, its negative pole are connected with inductance L2 first end；
Inductance L3, its first end are connected with diode D2 positive pole, its second end ground connection；Inductance L4, it is coupled with inductance L3；Two poles
Pipe D3, its positive pole are connected with inductance L4 first end, wherein, inductance L4 the second end ground connection；Diode D4, its negative pole and two
Pole pipe D3 negative pole is connected, its plus earth；Inductance L5, its first end are connected with diode D3 negative pole；Electric capacity C2, its
First end is connected with inductance L5 the second end, its second end ground connection；Resistance R1, it is in parallel with electric capacity C2.
Further, in the case where isolated converter is inverse excitation type converter, inverse excitation type converter includes：Inductance L6,
Its first end is connected with inductance L1 the second end；FET M3, its first end are connected with inductance L6 the second end, and it
Two ends are connected with the 3rd power supply V3, its 3rd end ground connection；Inductance L7, it is coupled with inductance L6, its first end ground connection；Diode
D5, its positive pole are connected with inductance L7 the second end；Electric capacity C3, its first end ground connection, its second end and diode D5 negative pole
It is connected；Resistance R2, it is in parallel with electric capacity C3.
Another aspect according to embodiments of the present invention, additionally provide a kind of parameter determination side of combined type buck converter
Method, it is characterised in that method is used for the parameter for determining the combined type buck converter of the present invention, and this method includes：Default imitative
The circuit model of combined electrical pressure transformer is established in true software；Adjust circuit model in different components parameter and to circuit
Model carries out simulation calculating；The parameter of each component in circuit model is determined according to simulation result.
Further, adjust the parameter of different components in circuit model and circuit model progress simulation calculating is included：
Component in circuit model in addition to parameter component undetermined is respectively set to corresponding default parameters；To parameter member undetermined
The parameter of device is adjusted and carries out simulation calculating, obtains the simulation result of the output voltage of combined type buck converter；Root
According to the parameter of the simulation result selection parameter component undetermined of output voltage.
Another aspect according to embodiments of the present invention, the parameter for additionally providing a kind of combined type buck converter determine dress
Put, the device is used for the parameter for determining the combined type buck converter of the present invention, and the device includes：Modeling unit, for pre-
If the circuit model of combined electrical pressure transformer is established in simulation software；Simulation unit, for adjusting different members in circuit model
The parameter of device simultaneously carries out simulation calculating to circuit model；Determining unit, it is every in circuit model for being determined according to simulation result
The parameter of individual component.
Further, simulation unit includes：Setup module, for by circuit model in addition to parameter component undetermined
Component is respectively set to corresponding default parameters；Emulation module, for the parameter of parameter component undetermined to be adjusted simultaneously
Simulation calculating is carried out, obtains the simulation result of the output voltage of combined type buck converter；Selecting module, for according to output electricity
The parameter of the simulation result selection parameter component undetermined of pressure.
In embodiments of the present invention, it is connected by buck converter BUCK, its input with DC voltage output end, is used
In the output voltage for reducing DC voltage output end；Isolated converter, its input are connected with the output end of booster converter,
For being adjusted to the output voltage after reduction, it is relatively low to solve the buck converter decompression ability provided in correlation technique
Technical problem, and then realize the technique effect that can be more effectively depressured.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of optional combined type buck converter according to embodiments of the present invention；
Fig. 2 is a kind of circuit theory schematic diagram of optional buck converter according to embodiments of the present invention；
Fig. 3 is a kind of optional single-ended circuit theory schematic diagram for just encouraging converter according to embodiments of the present invention；
Fig. 4 is a kind of output voltage waveforms signal of optional combined type buck converter according to embodiments of the present invention
Figure；
Fig. 5 is a kind of circuit theory schematic diagram of optional single-ended deexcitation converter according to embodiments of the present invention；
Fig. 6 is the schematic diagram of the optional combined type buck converter of another kind according to embodiments of the present invention；
Fig. 7 is the output voltage waveforms signal of the optional combined type buck converter of another kind according to embodiments of the present invention
Figure；
Fig. 8 is a kind of flow of the parameter determination method of optional combined type buck converter according to embodiments of the present invention
Figure；
Fig. 9 is a kind of optional combined type buck converter switching tube in buck converter according to embodiments of the present invention
Output voltage waveforms schematic diagram under different conduction ratio parameters；
Figure 10 is that the optional combined type buck converter of another kind according to embodiments of the present invention is opened in buck converter
Close output voltage waveforms schematic diagram of the pipe under different conduction ratio parameters；
Figure 11 is a kind of optional combined type buck converter according to embodiments of the present invention is just encouraging converter single-ended
Output voltage waveforms schematic diagram of the electric capacity under different parameters；
Figure 12 is a kind of optional combined type buck converter according to embodiments of the present invention in single-ended deexcitation converter
Output voltage waveforms schematic diagram of the electric capacity under different parameters；
Figure 13 is a kind of optional combined type buck converter inductance in buck converter according to embodiments of the present invention
Input current waveform schematic diagram under different parameters；
Figure 14 is that the optional combined type buck converter of another kind according to embodiments of the present invention is electric in buck converter
Feel the input current waveform schematic diagram under different parameters；
Figure 15 is a kind of optional combined type buck converter according to embodiments of the present invention is just encouraging converter single-ended
Input current waveform schematic diagram of the inductance under different parameters；
Figure 16 is a kind of optional combined type buck converter according to embodiments of the present invention in single-ended deexcitation converter
Input current waveform schematic diagram of the inductance under different parameters；
Figure 17 is a kind of showing for the parameter determining device of optional combined type buck converter according to embodiments of the present invention
It is intended to.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
This application provides a kind of embodiment of combined type buck converter.The combined type decompression transformation that the embodiment provides
Device includes buck converter BUCK and isolated converter.Wherein, buck converter BUCK input and DC voltage output end
It is connected, buck converter is used for the output voltage for reducing DC voltage output end；The input of isolated converter becomes with boosting
The output end of parallel operation is connected, and isolated converter is used to be adjusted the output voltage after reduction.
Fig. 1 is a kind of schematic diagram of optional combined type buck converter according to embodiments of the present invention, as shown in figure 1,
Buck converter includes：FET M1, inductance L1, diode D1, electric capacity C1.During blocking is switched, load takes off with power supply
From inductance L1 electric current realizes buck functionality through load and diode D1 afterflows.Wherein, FET M1 first end with it is straight
The positive pole of stream voltage output end is connected, and its second end is connected with the first power supply V1 first end, wherein, the first power supply V1's
Second end is grounded.Inductance L1 first end is connected with FET M1 the 3rd end.Diode D1 negative pole and FET
M1 the 3rd end is connected, its plus earth.Electric capacity C1 first end is connected with inductance L1 the second end, its second termination
Ground.Wherein, (mark represents the type or electricity of corresponding component to a kind of circuit theory diagrams of buck converter in figure as shown in Figure 2
Parameter type).
Optionally, FET M1 conduction ratio emulates by using default simulation software to multiple conduction ratio numerical value
The operation result of computing determines.
It should be noted that isolated converter can be forward converter (single-ended just to encourage converter) or anti-
Excitation type converter (single-ended deexcitation converter).
The situation that isolated converter is forward converter is considered below, a kind of circuit theory diagrams of forward converter are such as
(mark represents the type for corresponding to component in figure) shown in Fig. 3.Circuit shown in Fig. 2 and Fig. 3 is combined, obtained such as Fig. 1
Shown combined type buck converter, the combined type buck converter are decompression-forward converter, wherein, positive activation type conversion
Device includes：Inductance L2, FET M2, diode D2, inductance L3, inductance L4, diode D3, diode D4, inductance L5, electric capacity
C2, resistance R1.
Specifically, inductance L2 first end is connected with diode L1 the second end.FET M2 first end and electricity
Sense L2 the second end is connected, and its second end is connected with second source V2, its 3rd end ground connection.Diode D2 negative pole and electricity
Sense L2 first end is connected.Inductance L3 first end is connected with diode D2 positive pole, its second end ground connection.Inductance L4 with
Inductance L3 is coupled.Diode D3 positive pole is connected with inductance L4 first end, wherein, inductance L4 the second end ground connection.Two
Pole pipe D4 negative pole is connected with diode D3 negative pole, its plus earth.Inductance L5 first end and diode D3 negative pole
It is connected.Electric capacity C2 first end is connected with inductance L5 the second end, its second end ground connection.Resistance R1 is in parallel with electric capacity C2.
It is as shown in Figure 4 for combined type buck converter as shown in Figure 1, the oscillogram of its transmission voltage.
The situation that isolated converter is inverse excitation type converter is considered below, a kind of circuit theory diagrams of inverse excitation type converter are such as
(mark represents the type for corresponding to component in figure) shown in Fig. 5.Circuit shown in Fig. 2 and Fig. 5 is combined, obtained such as Fig. 6
Shown combined type buck converter, the combined type buck converter are decompression-inverse excitation type converter, wherein, inverse-excitation type conversion
Device includes：Inductance L6, FET M3, inductance L7, diode D5, electric capacity C3, resistance R2.
Specifically, inductance L6 first end is connected with inductance L1 the second end.FET M3 first end and inductance
L6 the second end is connected, and its second end is connected with the 3rd power supply V3, its 3rd end ground connection.Inductance L7 and inductance L6 phase couplings
Close, its first end ground connection.Diode D5 positive pole is connected with inductance L7 the second end.Electric capacity C3 first end ground connection, it the
Two ends are connected with diode D5 negative pole.Resistance R2 is in parallel with electric capacity C3.
It is as shown in Figure 7 for combined type buck converter as shown in Figure 6, the oscillogram of its transmission voltage.
Present invention also provides a kind of embodiment of the parameter determination method of combined type buck converter.Need what is illustrated
It is that this method is used for the parameter for determining combined type buck converter provided in an embodiment of the present invention.
Fig. 8 is a kind of flow of the parameter determination method of optional combined type buck converter according to embodiments of the present invention
Figure, as shown in figure 8, this method comprises the following steps：
Step S101, the circuit model of combined electrical pressure transformer is established in default simulation software；
Step S102, adjust the parameter of different components in circuit model and simulation calculating is carried out to circuit model；
Step S103, the parameter of each component in circuit model is determined according to simulation result.
The embodiment is connected by buck converter BUCK, its input with DC voltage output end, straight for reducing
Flow the output voltage of voltage output end；Isolated converter, its input are connected with the output end of booster converter, for drop
Output voltage after low is adjusted, and is solved the relatively low technology of the buck converter decompression ability provided in correlation technique and is asked
Topic, and then realize the technique effect that can be more effectively depressured.
Optionally, adjust the parameter of different components in circuit model and circuit model progress simulation calculating is included：Will
Component in circuit model in addition to parameter component undetermined is respectively set to corresponding default parameters；First device undetermined to parameter
The parameter of part is adjusted and carries out simulation calculating, obtains the simulation result of the output voltage of combined type buck converter；According to
The parameter of the simulation result selection parameter component undetermined of output voltage.
For example, for buck converter as shown in Figure 2, its output voltage V0With supply voltage VSBetween relation
For：
V0=DVS (1)
Wherein：D is the conduction ratio of buck converter.
According to the relation of the output voltage of buck converter and supply voltage, for combining code converter, should exist as follows
Relation：
VBUCK-Forward=DVForward (2)
VBUCK-Flyback=DVFlyback (3)
V in formula (2) and (3)ForwardAnd VFlybackThe output voltage of positive activation type and inverse excitation type converter is represented respectively,
Its oscillogram difference is as shown in figs. 4 and 7.The combined conversion that this group of image is primarily used to and accessed after buck converter
The output voltage of device is compared, and observes its antihypertensive effect.And VBUCK-ForwardAnd VBUCK-FlybackTwo kinds of access decompressions are represented to become
The output voltage of converter after parallel operation, respectively decompression-forward converter output voltage and decompression-inverse excitation type converter
Output voltage, for the further relation between checking output voltage and switching tube conduction ratio, choose 0.3,0.5 and 0.7 this 3
Conduction ratio numerical value, the changing rule of output voltage is observed, its oscillogram difference is as shown in Figure 9 and Figure 10.
Fig. 9 simulation result explanation, after output voltage stabilization, buck converter is accessed after forward converter
Output voltage VBUCK-Forward, hence it is evident that the output voltage V of the forward converter less than Fig. 4Forward, and M1 conduction ratio is got over
Small, output voltage is lower, the relation of coincidence formula (2).
Similarly, the output voltage V of Figure 10 decompression-inverse excitation type converterBUCK-Flyback, the also inverse-excitation type significantly lower than Fig. 7
The output voltage V of converterFlyback, and also comply with switch conduction ratio the relation of formula (3).
, will be electric to output after the secondary access buck converter of isolated converter in order to effectively verify in simulation process
Influence caused by pressure, it is ensured that its simulation result has the property of can refer to, and can join all circuits of converter shown in Fig. 1 and Fig. 6
Number, including the numerical values recited such as inductor, capacitor, coil turn, the conduction ratio for switching M2, load and the model of diode are protected
Hold it is invariable, to avoid other any factors from impacting output voltage.
After output voltage values are obtained by OrCAD Pspice simulation means, its value still has mistake with theoretical value
Difference.Caused by this nonideality mainly due to simulation software, predominantly following factor：
1) during the state transformation for turning on and blocking there is transition time in switch and diode.
2) on state resistance of switch and diode, voltage drop are not definitely zero, and off-state resistance still suffers from leakage current.
3) it is used as energy-storage travelling wave tube, the inductance and electric capacity in circuit still suffer from loss, and the impedance of circuit is not definitely zero.
If by the design principle of this combined converter of connectivity verification in kind, it is right under a certain parameter state to obtain
The experimental result answered, but changing rule of the final experimental result with circuit parameter can not be obtained, it also can not just carry out circuit parameter
Optimization analysis.This problem can be properly settled by introducing simulation software.
Pass through Fig. 9 and Figure 10 output voltage waveform：The output voltage ripple of decompression-inverse excitation type converter is obvious
It is bigger than normal, it is therefore necessary to take measures to reduce its output voltage ripple.
As shown in fig. 6, output voltage ripple Δ V0During being turned on equivalent to switching tube, storage capacitor C2To the load discharge phase
Between caused voltage variety.Now storage capacitor C2Electric current IC2Equal to output current I0, following relation be present:
Wherein：TonIt is the time of switch conduction in a cycle, cycle time TS, and Ton=DTS, voltage ripple Δ V0
Approx it can be determined by following formula：
From publicity (5), output voltage ripple Δ V0With storage capacitor C2Size be in inverse ratio.Figure 11 reflects energy storage
Electric capacity C2Equal to corresponding output voltage waveform under 10uF and 100uF states.Its simulation result also demonstrates this conclusion.Cause
This, effectively to reduce output voltage ripple, storage capacitor C2It is unsuitable too small.
To reduce input current ripple, it is necessary to be studied for the buck functionality part of two kinds of converters.Such as Fig. 1 and figure
Shown in 6：In the charging interval of switching tube conducting, switching tube M1 conductings, diode D1 cut-offs, supply voltage VSAct on inductance L1,
Inductive current iL1Linear rise, meet following relation：
Work as t=Ton=DTSWhen, iL1Reach maximum, above formula is changed into：
Therefore, the i during conductingL1Increment, that is, input current ripple Δ iL1It can be expressed by following formula：
V0The output voltage of buck converter during not access isolated converter, it is only relevant with M1 conduction ratio D, and will
The relation of formula (1) substitutes into above formula, and approximation can obtain：
Input current ripple can be expressed approx by formula (9), and be understood after circuit state tends towards stability, input current
Ripple Δ iL1It is in inverse ratio with inductance value L1.Figure 12 and Figure 13 be two kinds of combination code converters input inductance L1 be equal to 1mH and
Corresponding input current waveform figure, its simulation result also demonstrate the conclusion during 100mH.Moreover, oscillogram is passed through：
With inductance L1 increase, not only input current ripple substantially reduces, and in charging process electric current with the time ascendant trend
More tend towards stability, it is thus also avoided that the too high transient current of initial time occurs.
Voltage waveform corresponding to different circuit parameters is observed by simulation software, it is possible to judge that switch tube voltage should
The factor of influence of power.When Figure 14 is that inductance L2 is equal to 1mH and 100mH, the electricity at the switching tube M2 both ends of decompression-forward converter
Corrugating figure.It should be noted that be the switch tube voltage stress for effectively reducing decompression-forward converter, directly phase
Inductance L2 even is unsuitable too small.
For decompression-inverse excitation type converter, its switching tube M2 voltage stress influence factor is complex, not only with and its
The transformer being joined directly together once holds inductance L2 relevant, also relevant with secondary terminals inductance L3.
On the premise of Figure 15 is secondary terminals inductance L3 constant, changes and once hold inductance L2 sizes, treat that switch tube voltage is stable
Oscillogram afterwards.Clearly found by image comparison, when corresponding switch tube voltage is significantly lower than 100mH when L2 is equal to 10mH pair
The magnitude of voltage answered, L2 numerical value is smaller, and switch tube voltage stress is smaller.
Similarly, Figure 16 is on the premise of once holding inductance L2 holdings invariable, to change secondary terminals inductance L3 sizes and show
Switching tube M2 voltage oscillograms.As a result show：As L3 numerical value increases, switch tube voltage stress reduces.
As can be seen here, effectively to reduce decompression inverse excitation type converter switching tube M2 voltage stress, once inductance L2 is held not
Preferably excessive, secondary terminals inductance L3 is unsuitable too small.
The winding generally use spiral winding of isolating transformer, its inductance value are determined by following formula：
L is the inductance value of spiral winding, and k is Nagaoka's coefficient, and μ is the permeability of spiral winding inner-core, and N is helix
The number of turn is enclosed, S is the sectional area of spiral winding, and l is the length of spiral winding.
In above parameter, Nagaoka's coefficient k is fixed coefficient, and magnetic permeability mu depends on the material of iron core, changes coil turn
N can cause the change of output voltage, and loop length l depends primarily on the number of turn of coil.Therefore during equipment making,
In order to control the size of inductance value, realized preferably by the cross-sectional area for adjusting coil.That is, to reduce decompression-flyback
The switching tube M2 of formula converter voltage stress, the cross-sectional area for once holding inductance coil is reduced during equipment making,
Expand the cross-sectional area of secondary terminals inductance coil simultaneously.
Analysis is optimized by the parameters of electric power for two kinds of combined converters, it has been found that：By to circuit element parameter
Reasonably adjusted, can effectively reduce input current ripple and output voltage ripple, reduce the voltage that switching tube is born
Stress, and can prevent the phenomenon of instantaneous overcurrent from occurring.So it is possible to prevente effectively from noise caused by harmonic wave and signal are done
Disturb, it is ensured that the normal operation of equipment, improve the efficiency of power supply and the utilization rate of equipment, overcome surge voltage or electric current pair
Infringement caused by equipment, extend the service life of equipment.Therefore, it is very to carry out circuit parameter optimization design for converter
It is necessary.
It should be noted that accompanying drawing flow chart though it is shown that logical order, but in some cases, can be with
Shown or described step is performed different from order herein.
Present invention also provides a kind of embodiment of storage medium, the storage medium of the embodiment includes the program of storage,
Wherein, equipment performs the parameter of the combined type buck converter of the embodiment of the present invention where controlling storage medium when program is run
Determine method.
Present invention also provides a kind of embodiment of processor, the processor of the embodiment is used for operation program, wherein, journey
The parameter determination method of the combined type buck converter of the embodiment of the present invention is performed during sort run.
Present invention also provides a kind of embodiment of the parameter determining device of combined type buck converter.Need what is illustrated
It is that the device is used for the parameter for determining combined type buck converter provided in an embodiment of the present invention.
Figure 17 is a kind of showing for the parameter determining device of optional combined type buck converter according to embodiments of the present invention
It is intended to, as shown in figure 17, the device includes modeling unit 10, simulation unit 20 and determining unit 30, wherein, modeling unit is used for
The circuit model of combined electrical pressure transformer is established in default simulation software；Simulation unit is used to adjust different in circuit model
The parameter of component simultaneously carries out simulation calculating to circuit model；Determining unit is used to be determined in circuit model often according to simulation result
The parameter of individual component.
The embodiment establishes the circuit model of combined electrical pressure transformer by modeling unit in default simulation software, imitates
True unit adjusts the parameter of different components in circuit model and carries out simulation calculating to circuit model, and determining unit is according to emulation
As a result determine the parameter of each component in circuit model, solve the buck converter decompression ability that is provided in correlation technique compared with
Low technical problem, and then realize the technique effect that can be more effectively depressured.
As an alternative embodiment, simulation unit includes：Setup module, for by circuit model except parameter is treated
Determine the component outside component and be respectively set to corresponding default parameters；Emulation module, for parameter component undetermined
Parameter is adjusted and carries out simulation calculating, obtains the simulation result of the output voltage of combined type buck converter；Selecting module,
Parameter for the simulation result selection parameter component undetermined according to output voltage.
Above-mentioned device can include processor and memory, and said units can be stored in storage as program unit
In device, corresponding function is realized by the said procedure unit of computing device storage in memory.
Memory may include computer-readable medium in volatile memory, random access memory (RAM) and/
Or the form such as Nonvolatile memory, such as read-only storage (ROM) or flash memory (flash RAM), memory includes at least one deposit
Store up chip.
The present invention proposes a kind of combined type buck converter and its parameter determination method, wherein, combined type decompression transformation
Device can use two kinds of new converters with isolated converter Combination Design, and it is possible to by simulation means analysis and
The operation principle of combined type buck converter is verified, circuit parameter optimization analysis can be further carried out to combined converter, really
Combined converter is protected to have the following characteristics that：
1) the secondary buck functionality of two kinds of isolated converters can be realized, input voltage range is significantly increased, it is non-
Often suitable for the high input voltages such as portable electric appts, the occasion of low pressure output.
2) by adjusting storage capacitor and inductance, output voltage ripple and input current ripple can be effectively reduced, is overcome
Negative effect caused by ripple, and the phenomenon for avoiding momentary excess current occurs.
3) in the case of same output voltage, it efficiently avoid the too high or too low criticality of switching tube conduction ratio
Occur, it is ensured that the efficiency of system is unaffected.
4) voltage stress of switching device can be effectively reduced by being dimensioned correctly the size of inductance element.
5) safety of user can be further ensured that by taking electrical isolation measure, and avoid load equipment from sustaining damage.
The order of above-mentioned the embodiment of the present application does not represent the quality of embodiment.
In above-described embodiment of the application, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, it may refer to the associated description of other embodiment.In several embodiments provided herein, it should be appreciated that
Arrive, disclosed technology contents, can realize by another way.
Wherein, device embodiment described above is only schematical, such as the division of the unit, can be one
Kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or
Another system is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed it is mutual it
Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
Connect, can be electrical or other forms.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, the technical scheme of the application is substantially
The part to be contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are causing a computer
Equipment (can be personal computer, server or network equipment etc.) perform each embodiment methods described of the application whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of the application principle is not departed from, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (10)
- A kind of 1. combined type buck converter, it is characterised in that including：Buck converter BUCK, its input are connected with DC voltage output end, for reducing the DC voltage output end Output voltage；Isolated converter, its input are connected with the output end of the booster converter, for the output after reduction Voltage is adjusted.
- 2. combined type buck converter according to claim 1, it is characterised in that the buck converter includes：FET M1, its first end are connected with the positive pole of the DC voltage output end, its second end and the first power supply V1 First end be connected, wherein, the second end of the first power supply V1 ground connection；Inductance L1, its first end are connected with the 3rd end of the FET M1；Diode D1, its negative pole are connected with the 3rd end of the FET M1, its plus earth；Electric capacity C1, its first end are connected with the second end of the inductance L1, its second end ground connection.
- 3. combined type buck converter according to claim 2, it is characterised in that the conduction ratio of the FET M1 leads to Cross the operation result determination that using default simulation software multiple conduction ratio numerical value are carried out with simulation calculating.
- 4. combined type buck converter according to claim 2, it is characterised in that the isolated converter becomes for positive activation type Parallel operation or inverse excitation type converter.
- 5. combined type buck converter according to claim 3, it is characterised in that the isolated converter for it is described just In the case of excitation type converter, the forward converter includes：Inductance L2, its first end are connected with the second end of the diode L1；FET M2, its first end are connected with the second end of the inductance L2, and its second end is connected with second source V2, Its 3rd end is grounded；Diode D2, its negative pole are connected with the first end of the inductance L2；Inductance L3, its first end are connected with the positive pole of the diode D2, its second end ground connection；Inductance L4, it is coupled with the inductance L3；Diode D3, its positive pole are connected with the first end of the inductance L4, wherein, the second end ground connection of the inductance L4；Diode D4, its negative pole are connected with the negative pole of the diode D3, its plus earth；Inductance L5, its first end are connected with the negative pole of the diode D3；Electric capacity C2, its first end are connected with the second end of the inductance L5, its second end ground connection；Resistance R1, it is in parallel with the electric capacity C2.
- 6. combined type buck converter according to claim 3, it is characterised in that in the isolated converter be described anti- In the case of excitation type converter, the inverse excitation type converter includes：Inductance L6, its first end are connected with the second end of the inductance L1；FET M3, its first end are connected with the second end of the inductance L6, and its second end is connected with the 3rd power supply V3, Its 3rd end is grounded；Inductance L7, it is coupled with the inductance L6, its first end ground connection；Diode D5, its positive pole are connected with the second end of the inductance L7；Electric capacity C3, its first end ground connection, its second end is connected with the negative pole of the diode D5；Resistance R2, it is in parallel with the electric capacity C3.
- 7. a kind of parameter determination method of combined type buck converter, it is characterised in that methods described is used to determine that right such as will The parameter of the combined type buck converter any one of 1 to 6 is sought, methods described includes：The circuit model of the combined electrical pressure transformer is established in default simulation software；Adjust the parameter of different components in the circuit model and simulation calculating is carried out to the circuit model；The parameter of each component in the circuit model is determined according to simulation result.
- 8. according to the method for claim 7, it is characterised in that adjust the parameter of different components in the circuit model simultaneously Carrying out simulation calculating to the circuit model includes：Component in the circuit model in addition to parameter component undetermined is respectively set to corresponding default parameters；The parameter of parameter component undetermined is adjusted and carries out simulation calculating, obtains the combined type buck converter Output voltage simulation result；The parameter of the parameter component undetermined is selected according to the simulation result of the output voltage.
- 9. a kind of parameter determining device of combined type buck converter, it is characterised in that described device is used to determine that right such as will The parameter of the combined type buck converter any one of 1 to 6 is sought, described device includes：Modeling unit, for establishing the circuit model of the combined electrical pressure transformer in default simulation software；Simulation unit, for adjusting the parameter of different components in the circuit model and carrying out emulation fortune to the circuit model Calculate；Determining unit, for determining the parameter of each component in the circuit model according to simulation result.
- 10. device according to claim 9, it is characterised in that the simulation unit includes：Setup module, corresponding to the component in the circuit model in addition to parameter component undetermined is respectively set to Default parameters；Emulation module, for being adjusted to the parameter of parameter component undetermined and carrying out simulation calculating, obtain described group The simulation result of the output voltage of box-like buck converter；Selecting module, for selecting the parameter of the parameter component undetermined according to the simulation result of the output voltage.
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| CN201710802951.4A CN107681894A (en) | 2017-09-07 | 2017-09-07 | Combined type buck converter and its parameter determination method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710802951.4A CN107681894A (en) | 2017-09-07 | 2017-09-07 | Combined type buck converter and its parameter determination method |
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|---|---|---|---|---|
| CN1286523A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Sigle-stage AC/DC converter with power factor correction |
| CN203562954U (en) * | 2013-10-10 | 2014-04-23 | 洛阳隆盛科技有限责任公司 | Small-sized direct-current high-voltage buck isolation conversion circuit |
| CN106485006A (en) * | 2016-10-14 | 2017-03-08 | 国网北京市电力公司 | Emulation mode and device |
| CN106501704A (en) * | 2016-10-14 | 2017-03-15 | 国网北京市电力公司 | Emulation mode and device |
| CN106849669A (en) * | 2017-03-10 | 2017-06-13 | 广州金升阳科技有限公司 | A kind of positive exciting switching voltage regulator |
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2017
- 2017-09-07 CN CN201710802951.4A patent/CN107681894A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1286523A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Sigle-stage AC/DC converter with power factor correction |
| CN203562954U (en) * | 2013-10-10 | 2014-04-23 | 洛阳隆盛科技有限责任公司 | Small-sized direct-current high-voltage buck isolation conversion circuit |
| CN106485006A (en) * | 2016-10-14 | 2017-03-08 | 国网北京市电力公司 | Emulation mode and device |
| CN106501704A (en) * | 2016-10-14 | 2017-03-15 | 国网北京市电力公司 | Emulation mode and device |
| CN106849669A (en) * | 2017-03-10 | 2017-06-13 | 广州金升阳科技有限公司 | A kind of positive exciting switching voltage regulator |
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