CN106100317A - A kind of ISIPOSOP pattern massing DC DC changer and composing method thereof and output voltage control method - Google Patents

Abstract

The invention discloses a kind of ISIPOSOP pattern massing DC DC changer and composing method thereof and output voltage control method, comprise M*N basic DC DC module, each described basic DC DC module includes any type of DC DC changer, wherein: M described basic DC DC module is attached by the way of input parallel connection and output-parallel, constitutes 1 DC DC power converter cells；The quantity of described DC DC power converter cells is N number of, and N number of described DC DC power converter cells connects by the way of input is connected and exported series connection.This changer being made up of multiple basic DC DC modules of the present invention has the premium properties that can simultaneously bear input and output two ends high-voltage great-current.

Description

A kind of ISIPOSOP pattern massing DC-DC converter and composing method thereof and output electricity Pressure control method

Technical field

The present invention relates to DC-DC converter technical field, particularly relate to a kind of ISIPOSOP pattern massing DC-DC converter And composing method and output voltage control method.

Background technology

Direct current network technology is to realize large-scale electric energy transmission, interconnection AC power grid operation and regenerative resource to integrate Effective measures, and the key equipment in direct current network is DC-DC converter, and its characteristic concerns the performance of whole system.But It is that, owing to the capacity of single switch device is limited, traditional DC-DC converter concentrates on mesolow and low power range, It is not applied for high-voltage large-capacity occasion.

At present, in order to improve the capacity of DC-DC converter, ISOS (input series connection output series connection), ISOP (input series connection defeated Go out parallel connection), the conversion of IPOS (input-series and output-parallel), IPOP (input Parallel opertation in parallel) isostructural modularity DC-DC Device has been suggested.

IPOP pattern massing DC-DC converter is suitable for the situation that input and output electric current is the biggest, and it is by N number of DC-DC module In parallel in parallel with outfan at input, input and output terminal voltage and the modules input and output terminal voltage of changer system are The same, so this structure does not reduce the voltage born of each module；

IPOS pattern massing DC-DC converter is well suited for high output voltage, powerful situation, and it is by N number of DC-DC module And outfan in parallel at input is connected, the input voltage of changer system and output electric current and the input voltage of modules and Output electric current is the same, so this structure does not reduce the voltage of each module input and the electric current of outfan；

ISOP pattern massing DC-DC converter is suitable for high input voltage, powerful application scenario, but does not reduce Each module electric current at input and the voltage of outfan；

ISOS pattern massing DC-DC converter agrees with input voltage and the biggest situation of output voltage especially, but not Have and reduce the electric current that each module is born.

But they common defects are exactly to be difficult to bear the high-voltage great-current at input and output two ends simultaneously.Accordingly, it would be desirable to seek Look for other method to realize can to bear at input and output two ends the DC-DC converter of high-voltage great-current, and require DC- DC changer can also realize the fast and stable of output voltage.

Summary of the invention

In order to overcome above-mentioned technical problem, the present invention puts forward a kind of input string parallel connection-output connection in series-parallel (ISIPOSOP) Pattern massing DC-DC converter, uses input string in parallel and the compound mode of output connection in series-parallel (ISIPOSOP), is a kind of module The DC-DC converter changed.The voltage and current that it makes each module bear greatly reduces, the whole DC-DC conversion of composition Device can bear input and the high-voltage large current at output two ends, it is possible to realizes high-voltage great-current DC-DC conversion.

In order to reach foregoing invention purpose, solve the technical scheme that its technical problem used as follows:

The invention discloses a kind of ISIPOSOP pattern massing DC-DC converter, comprise M*N basic DC-DC module, often Individual described basic DC-DC module includes any type of DC-DC converter, wherein:

M described basic DC-DC module is attached by the way of input parallel connection and output-parallel, constitutes 1 DC-DC Power converter cells；

The quantity of described DC-DC converter unit is N number of, and N number of described DC-DC converter unit is connected and defeated by input The mode going out series connection connects.

Preferably, described DC-DC converter is Buck changer, Boost, Cuk changer, single-end ortho-exciting conversion In device, single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.

The present invention additionally discloses the composing method of a kind of ISIPOSOP pattern massing DC-DC converter, mainly include with Lower step:

S1: choose any one DC-DC converter as basic DC-DC module；

S2: choose wherein M basic DC-DC module, by parallel and defeated by input for M the basic DC-DC module chosen The mode going out parallel connection is attached, and constitutes the DC-DC converter unit of a more capacity；

S3: repeat step S2, obtain other N-1 DC-DC converter unit；

S4: connected by the way of input is connected and exported series connection by the N number of DC-DC converter unit obtained, is constituted ISIPOSOP pattern massing DC-DC converter so that whole changer system has M*N basic DC-DC module.

Preferably, described DC-DC converter is Buck changer, Boost, Cuk changer, single-end ortho-exciting conversion In device, single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.

The invention also discloses the output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter, mainly Comprise the following steps:

S10: choose any one DC-DC converter as basic DC-DC module, according to target selection base to be reached The number of modules of this DC-DC module, i.e. determines the numerical value of M and N, the simultaneously given component parameters forming each basic DC-DC module；

S20: each basic DC-DC module is carried out small-signal modeling and obtains the small-signal of each basic DC-DC module Model；

S30: be combined further according to ISIPOSOP mode, obtains the little letter of ISIPOSOP pattern massing DC-DC converter Number model；

S40: set up each basic DC-according to the small-signal model of the ISIPOSOP pattern massing DC-DC converter obtained The approximation small-signal model of DC module, is assigned to each by the load average of whole ISIPOSOP pattern massing DC-DC converter Basic DC-DC module, if the load of whole ISIPOSOP pattern massing DC-DC converter is R_L, then small-signal model is approximated Load be R_L/ N, thus obtain for this ISIPOSOP pattern massing DC-DC converter output voltage control design near Like small-signal model；

S50: obtain the output of each basic DC-DC module according to the approximation small-signal model of each basic DC-DC module Voltage disturbanceWith dutycycle disturbance Approximate relation, and derive the pass between output voltage disturbance and dutycycle disturbance further according to this approximate relation It it is formula；

S60: according to the relational expression between output voltage disturbance and dutycycle disturbance and suitable phase margin and passing through Frequency, provides the expression of controller, and controller changes dutycycle according to output voltage fluctuation, changes output electricity in turn Pressure, so that output voltage fast and stable is in setting value.

Further, in step S50, the output voltage disturbance of each described basic DC-DC moduleWith dutycycle disturbance Approximate relation:

$\frac{{{\tilde{v}}^{\′}}_o}{\tilde{d}}=\frac{{\mathrm{nV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(1\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator, L, C in each basic DC-DC module Filter inductance and electric capacity, V for each basic DC-DC module_in、It is input rated voltage and the output electricity of whole system respectively Pressure disturbance.

Further, according to the output voltage disturbance of each described basic DC-DC moduleWith dutycycle disturbanceNear Like relational expression, release the output voltage of ISIPOSOP changer system furtherWith dutycycle disturbanceBetween relational expression:

$\frac{{\tilde{v}}_{out}}{\tilde{d}}=\frac{{\mathrm{nNV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(2\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator, L, C in each basic DC-DC module Filter inductance and electric capacity, V for each basic DC-DC module_in、It is input rated voltage and the output of whole system respectively Rated voltage.

Further, in step 60, as output voltage V_outDeviation reference value V_out,refTime, a departure can be produced, control Device processed changes the dutycycle of modules by this departure, as output voltage V_outDeviation reference value V_out,refTime, duty Than there is corresponding change the most therewith, the change of dutycycle adjusts output voltage the most in turn, makes output voltage stabilization in reference Value, the dutycycle of each module is D_ij(i=1,2,3 ..., N；J=1,2,3 ..., M), according to suitable phase margin and passing through Frequency, provides the expression formula that controller is concrete, is come according to output voltage undulated control dutycycle by controller so that exporting Voltage stabilization is in setting value.

Further, in step 60, the expression of described controller is:

$K_{dc}\left(s\right)=\frac{k_C}{s}\left(\frac{\frac{s}{{\mathrm{\ω}}_z}+1}{\frac{s}{{\mathrm{\ω}}_p}+1}\right)---\left(3\right)$

Wherein, k_c、ω_zAnd ω_pIt is undetermined constant.

Further, described DC-DC converter is Buck changer, Boost, Cuk changer, single-end ortho-exciting change In parallel operation, single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.

Due to the fact that the above technical scheme of employing, be allowed to compared with prior art, have the following advantages that and actively imitate Really:

1. the present invention uses a kind of input string parallel connection-output connection in series-parallel (ISIPOSOP) pattern massing DC-DC converter, should Changer can bear input and the high-voltage great-current at output two ends, at this aspect compared to ISOS, ISOP, IPOS, IPOP Isostructural modularity DC-DC converter, has significant advantage；ISIPOSOP pattern massing DC-DC converter use based on The output voltage control method of approximation small-signal model, can make system output voltage fast and stable；

2. the output voltage control side based on approximation small-signal model of a kind of ISIPOSOP of present invention type DC-DC converter Method can make the output voltage fast and stable of this changer in setting value, when modules parameter is symmetrical or the most asymmetric Time, the method can make output voltage fast and stable；

3. the present invention uses input string in parallel and the compound mode of output connection in series-parallel (ISIPOSOP), is a kind of modular DC-DC converter.The voltage and current that it makes each module bear greatly reduces, the whole DC-DC converter energy of composition Enough bear input and the high-voltage large current at output two ends, it is possible to realize high-voltage great-current DC-DC conversion.

Accompanying drawing explanation

In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below Accompanying drawing be briefly described.It is clear that the accompanying drawing in describing below is only some embodiments of the present invention, for ability From the point of view of field technique personnel, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.Attached In figure:

Fig. 1 is the structure chart of ISIPOSOP pattern massing DC-DC converter of the present invention；

Fig. 2 is the structural representation of a basic DC-DC module in ISIPOSOP pattern massing DC-DC converter of the present invention；

Fig. 3 is the structural representation of the small-signal model of ISIPOSOP pattern massing DC-DC converter of the present invention；

Fig. 4 is the structural representation of the approximation small-signal model of ISIPOSOP pattern massing DC-DC converter of the present invention；

Fig. 5 is ISIPOSOP pattern massing DC-DC converter output voltage control schematic diagram of the present invention；

Fig. 6 be in ISIPOSOP pattern massing DC-DC converter of the present invention four basic DC-DC module in PLECS Simulation Interface schematic diagram；

Fig. 7 a, 7b, 7c, 7d are that ISIPOSOP pattern massing DC-DC converter of the present invention is respectively at input voltage Output voltage waveform when 4000V, 5000V, 6000V, 7000V；

Fig. 8 a, 8b be ISIPOSOP pattern massing DC-DC converter of the present invention when input voltage is 5000V, each module Parameter be respectively symmetrically with slight asymmetric time output voltage waveform.

Detailed description of the invention

Below with reference to the accompanying drawing of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete description And discussion, it is clear that a part of example of the only present invention as described herein, is not whole examples, based on the present invention In embodiment, the every other enforcement that those of ordinary skill in the art are obtained on the premise of not making creative work Example, broadly falls into protection scope of the present invention.

Embodiment one

As it is shown in figure 1, the invention discloses a kind of ISIPOSOP pattern massing DC-DC converter, comprise M*N substantially DC-DC module, each described basic DC-DC module includes any type of DC-DC converter, wherein: M described basic DC- DC module is attached by the way of input parallel connection and output-parallel, constitutes 1 DC-DC converter unit；Described DC-DC becomes The quantity of exchange unit is N number of, and N number of described DC-DC converter unit connects by the way of input is connected and exported series connection.

Wherein, described DC-DC converter can be Buck changer, Boost, Cuk changer, single-end ortho-exciting change In parallel operation, single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.But basic module Selection be not limited to above several, the system that any changer takes the connected mode of ISIPOSOP to constitute all can be regarded as the present invention Scope.

Embodiment two

As it is shown in figure 1, the present invention additionally discloses the composing method of a kind of ISIPOSOP pattern massing DC-DC converter, Mainly comprise the steps that

S1: choose any one DC-DC converter as basic DC-DC module；

S2: choose wherein M basic DC-DC module, by parallel and defeated by input for M the basic DC-DC module chosen The mode going out parallel connection is attached, and constitutes the DC-DC converter unit (representing with SM) of a more capacity；

S3: repeat step S2, obtain other N-1 DC-DC converter unit；By this N number of DC-DC converter unit respectively It is expressed as SM 1, SM 2 ..., SM N；

S4: the SM 1 obtained, SM 2 ..., this N number of DC-DC converter unit of SM N are connected by input and exports string Connection constitutes ISIPOSOP pattern massing DC-DC converter so that whole changer system has M*N basic DC-DC module, from From the point of view of in entirety, system input and outfan have series connection and parallel way, the most referred to as ISIPOSOP pattern massing DC- DC changer.

Wherein, described DC-DC converter can be Buck changer, Boost, Cuk changer, single-end ortho-exciting change In parallel operation, single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.But basic module Selection be not limited to above several, the system that any changer takes the connected mode of ISIPOSOP to constitute all can be regarded as the present invention Scope.

In the present embodiment, choose the ISIPOSOP pattern massing DC-DC converter of full-bridge isolated DC-DC converter.? In step S1, first choosing full-bridge isolated DC-DC converter as basic DC-DC module, its structure is as in figure 2 it is shown, every The filter inductance of individual basic DC-DC module is L, and filter capacitor is C, and transformer voltage ratio is 1:n, T₁、T₂、T₃、T₄For derailing switch Part；D₁、D₂、D₃、D₄For arranging diode.

Embodiment three

, the invention also discloses the output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter, mainly Comprise the following steps:

S10, choose any one DC-DC converter as basic DC-DC module, according to target selection base to be reached The number of this DC-DC module module, i.e. determines the numerical value of M and N, the simultaneously given component parameters forming each basic DC-DC module, Switching device as to be selected in full-bridge isolated DC-DC converter, filter inductance, filter capacitor and the parameter of transformer voltage ratio；

Owing to the output voltage control of DC-DC converter is typically to be realized by linear control method, with setting up small-signal The method of model can realize the Linear Control to DC-DC converter.First the small-signal model of each module is obtained, then Set up the small-signal model of whole changer system, as described in step S20 and S30, concrete:

S20, each basic DC-DC module is carried out small-signal modeling and obtains the small-signal of each basic DC-DC module Model；

S30, it is combined further according to ISIPOSOP mode, obtains the little letter of ISIPOSOP pattern massing DC-DC converter Number model, as shown in Figure 3；

S40, for the ease of control design case, simplify control method, according to the ISIPOSOP pattern massing DC-DC conversion obtained The small-signal model of device sets up the approximation small-signal model of each basic DC-DC module, and it ignores modules the most exactly Between little bit different, modules as identical module.By whole ISIPOSOP pattern massing DC-DC converter Load average be assigned to each basic DC-DC module, if the load of whole ISIPOSOP pattern massing DC-DC converter is R_L, then the load approximating small-signal model is R_L/ N, thus obtain for this ISIPOSOP pattern massing DC-DC converter defeated Go out the approximation small-signal model of Control of Voltage design, as shown in Figure 4；

S50, approximation small-signal model according to each basic DC-DC module obtain the output of each basic DC-DC module Voltage disturbanceWith dutycycle disturbance Approximate relation,

$\frac{{{\tilde{v}}^{\′}}_o}{\tilde{d}}=\frac{{\mathrm{nV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(1\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator, L, C in each basic DC-DC module Filter inductance and electric capacity, V for each basic DC-DC module_in、It is input rated voltage and the output electricity of whole system respectively Pressure disturbance.

And derive the relational expression between output voltage disturbance and dutycycle disturbance further according to this approximate relation；

$\frac{{\tilde{v}}_{out}}{\tilde{d}}=\frac{{\mathrm{nNV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(2\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator, L, C in each basic DC-DC module Filter inductance and electric capacity, V for each basic DC-DC module_in、It is input rated voltage and the output electricity of whole system respectively Pressure disturbance.

S60, control principle according to output voltage, i.e. as output voltage V_outDeviation reference value V_out,refTime, one can be produced Individual departure, controller changes the dutycycle of modules by this departure, and (modules employing is all that PWM adjusts System).Therefore, when output voltage deviation reference value, there is corresponding change, the most anti-mistake of change of dutycycle in dutycycle the most therewith Adjust output voltage, make output voltage stabilization in reference value, as it is shown in figure 5, the dutycycle of each module is D_ij(i=1,2, 3,…,N；J=1,2,3 ..., M)；

In order to realize the fast and stable of output voltage, PID controller chosen by controller.This controller design process is simple, Control accuracy is high, and the expression-form of this controller is:

$K_{dc}\left(s\right)=\frac{k_C}{s}\left(\frac{\frac{s}{{\mathrm{\ω}}_z}+1}{\frac{s}{{\mathrm{\ω}}_p}+1}\right)---\left(3\right)$

Wherein, k_c,ω_z,ω_pIt is undetermined constant.

According to suitable phase margin (PM) and cross-over frequency, provide the concrete expression formula of controller controller, logical Cross controller and control dutycycle so that output voltage stabilization is in setting value according to output voltage fluctuation.

Making a concrete analysis of this output voltage control method below by emulation case, emulation is by software PLECS Realizing, step is as follows:

According to design object as shown in table 1, use 4 full-bridge isolated DC-DC convertor module composition ISIPOSOP Changer system, chooses suitable parameter for the element in modules, as shown in table 2.Each parameter is substituted into formula (2), obtains The output voltage of ISIPOSOP changer systemWith dutycycle disturbanceBetween expression formula such as formula (4).

Table 1. design object

Project	Numerical value
		Input voltage	4000 [V]～7000 [V]
Output voltage	14400[V]
		Maximum output voltage fluctuates	0.5%V<sub>o</sub>
Switching frequency	100[KHz]

Table 2. ISIPOSOP pattern massing DC-DC converter design parameter

Project	Symbol	Numerical value
			Number of modules	MN	4
Each module filtered inductance	L	100[μH]
			Each module filtered electric capacity	C	100[μF]
Transformer voltage ratio	1:n	1:4
			Load resistance	R<sub>L</sub>	20[Ω]

$G_p\left(s\right)\frac{{\tilde{v}}_{out}}{{\tilde{d}}_{ij}}=\frac{89600}{{10}^{-8}{s}^2+2\×{10}^{-5}s+1}---\left(4\right)$

Expression formula further according to (4) designs the concrete expression formula of controller such as formula (5).

$K_{dc}\left(s\right)=\frac{0.011175}{s}---\left(5\right)$

Simulation Interface in PLECS software as described in Figure 6, the simulation result obtained in PLECS software such as Fig. 7 a, Shown in 7b, 7c, 7d and Fig. 8 a, 8b.

Parameter in each basic DC-DC module original paper is selected such as table 2, and take proposed output voltage control method Time, adjust the size of ISIPOSOP changer system input voltage, be 4000V, 5000V, 6000V and 7000V respectively, then see Examine the situation of system output voltage.According to Fig. 7 a, 7b, 7c, 7d, when system input voltage changes, system output voltage Waveform changes, but output voltage can be stable at 14400V in 0.08s.Illustrate this based on approximation small-signal model Output voltage control method there is the characteristic of fast and stable output voltage.

According to Fig. 8 a and 8b, each basic DC-DC module has the setting value of component parameters deviation table 2, i.e. L₁₁ =110 μ H, C₁₂=110 μ F, L₂₁=90 μ H, C₂₂=90 μ F.When system input voltage is 5000V, by ISIPOSOP system and The output voltage waveforms of each basic DC-DC module contrasts in the symmetrical and the most asymmetric two kinds of situations of parameter.Work as parameter Time symmetrical, the output voltage of each basic DC-DC module is identical, and the output voltage fast and stable of system is at 14400V；Work as parameter Slight asymmetric time, there is difference in the output voltage of four modules, but during the output voltage waveforms same parameter symmetry of system Waveform is basically identical, and still fast and stable is at 14400V；Illustrate this output voltage control method parameter slight asymmetric time The most effective.

The output based on approximation small-signal model of ISIPOSOP type DC-DC converter is concluded that according to simulation result Voltage control method can make the output voltage fast and stable of this changer in setting value, when modules parameter is symmetrical or Slight asymmetric time, the method can make output voltage fast and stable.

The present invention emulates feature and the advantage that case is only intended to help to illustrate the present invention.Emulation case only represents a kind of shape The concrete application of formula, is also not intended to the detailed description of the invention that this invention is only described.Obviously, according to the content of this specification, can Make many modifications and variations.These embodiments are chosen and specifically described to this specification, in order to preferably explain the present invention Principle and actual application, so that skilled artisan can utilize the present invention well.The present invention is only wanted by right Ask the restriction of book and four corner thereof and equivalent.

Claims (10)

1. an ISIPOSOP pattern massing DC-DC converter, it is characterised in that comprise M*N basic DC-DC module, each Described basic DC-DC module includes any type of DC-DC converter, wherein:

M described basic DC-DC module is attached by the way of input parallel connection and output-parallel, constitutes 1 DC-DC conversion Device unit；

The quantity of described DC-DC converter unit is N number of, and N number of described DC-DC converter unit is connected by input and exports string The mode of connection connects.

A kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 1, it is characterised in that described DC-DC Changer is Buck changer, Boost, Cuk changer, single-ended forward converter, single end flyback converter, full-bridge In DC-DC converter and isolation type DC-DC converter any one.

3. the composing method of an ISIPOSOP pattern massing DC-DC converter, it is characterised in that mainly comprise the steps that

S1: choose any one DC-DC converter as basic DC-DC module；

S2: choose wherein M basic DC-DC module, by individual for the M chosen basic DC-DC module by inputting in parallel and exporting also The mode of connection is attached, and constitutes the DC-DC converter unit of a more capacity；

S3: repeat step S2, obtain other N-1 DC-DC converter unit；

S4: connected by the way of input is connected and exported series connection by the N number of DC-DC converter unit obtained, is constituted ISIPOSOP pattern massing DC-DC converter so that whole changer system has M*N basic DC-DC module.

The composing method of a kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 3, its feature exists In, described DC-DC converter is Buck changer, Boost, Cuk changer, single-ended forward converter, single-ended reverse exciting In changer, full-bridge DC-DC converter and isolation type DC-DC converter any one.

5. the output voltage control method of an ISIPOSOP pattern massing DC-DC converter, it is characterised in that include following step Rapid:

S10: choose any one DC-DC converter as basic DC-DC module, basic according to target selection to be reached The number of modules of DC-DC module, i.e. determines the numerical value of M and N, the simultaneously given component parameters forming each basic DC-DC module；

S20: each basic DC-DC module is carried out small-signal modeling and obtains the small-signal model of each basic DC-DC module；

S30: be combined further according to ISIPOSOP mode, obtains the small-signal mould of ISIPOSOP pattern massing DC-DC converter Type；

S40: set up each basic DC-DC mould according to the small-signal model of the ISIPOSOP pattern massing DC-DC converter obtained The approximation small-signal model of block, the load average of whole ISIPOSOP pattern massing DC-DC converter is assigned to each substantially DC-DC module, if the load of whole ISIPOSOP pattern massing DC-DC converter is R_L, then approximation small-signal model is negative Carry as R_L/ N, thus it is little to obtain the approximation for the design of this ISIPOSOP pattern massing DC-DC converter output voltage control Signal model；

S50: obtain the output voltage of each basic DC-DC module according to the approximation small-signal model of each basic DC-DC module DisturbanceWith dutycycle disturbance Approximate relation, and derive the pass between output voltage disturbance and dutycycle disturbance further according to this approximate relation It it is formula；

S60: according to the relational expression between output voltage disturbance and dutycycle disturbance and suitable phase margin and cross-over frequency, Providing the expression of controller, controller changes dutycycle according to output voltage fluctuation, changes output voltage in turn, from And make output voltage fast and stable in setting value.

The output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 5, its It is characterised by, in step S50, the output voltage disturbance of each described basic DC-DC moduleWith dutycycle disturbanceApproximation Relational expression:

$\frac{{{\tilde{v}}^{\′}}_o}{\tilde{d}}=\frac{{\mathrm{nV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(1\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator in each basic DC-DC module, and L, C are every The filter inductance of individual basic DC-DC module and electric capacity, V_in、It is that input rated voltage and the output voltage of whole system is disturbed respectively Dynamic.

The output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 6, its It is characterised by, according to the output voltage disturbance of each described basic DC-DC moduleWith dutycycle disturbanceApproximate relation, Release the output voltage of ISIPOSOP changer system furtherWith dutycycle disturbanceBetween relational expression:

$\frac{{\tilde{v}}_{out}}{\tilde{d}}=\frac{{\mathrm{nNV}}_{in}}{1+s\frac{NL}{R_L}+s^{2}LC}---\left(2\right)$

Wherein, N is the number of series unit, and n is the inverse of the transformation ratio of transformator in each basic DC-DC module, and L, C are every The filter inductance of individual basic DC-DC module and electric capacity, V_in、The input rated voltage and the output that are whole system respectively are specified Voltage.

The output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 5, its It is characterised by, in step 60, as output voltage V_outDeviation reference value V_out,refTime, a departure can be produced, controller passes through This departure changes the dutycycle of modules, as output voltage V_outDeviation reference value V_out,refTime, dutycycle is the most therewith Corresponding change occurs, and the change of dutycycle adjusts output voltage the most in turn, makes output voltage stabilization at reference value, Mei Gemo The dutycycle of block is D_ij(i=1,2,3 ..., N；J=1,2,3 ..., M), according to suitable phase margin and cross-over frequency, be given The expression formula that controller is concrete, is come according to output voltage undulated control dutycycle so that output voltage stabilization exists by controller Setting value.

9. according to the output voltage control side of a kind of ISIPOSOP pattern massing DC-DC converter described in claim 5 or 8 Method, it is characterised in that in step 60, the expression of described controller is:

$K_{dc}\left(s\right)=\frac{k_C}{s}\left(\frac{\frac{s}{{\mathrm{\ω}}_z}+1}{\frac{s}{{\mathrm{\ω}}_p}+1}\right)---\left(3\right)$

Wherein, k_c、ω_zAnd ω_pIt is undetermined constant.

The output voltage control method of a kind of ISIPOSOP pattern massing DC-DC converter the most according to claim 5, It is characterized in that, described DC-DC converter be Buck changer, Boost, Cuk changer, single-ended forward converter, In single end flyback converter, full-bridge DC-DC converter and isolation type DC-DC converter any one.