CN101635505A - Method for controlling structure of a plurality of input-series and output-parallel converters - Google Patents
Method for controlling structure of a plurality of input-series and output-parallel converters Download PDFInfo
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Abstract
The invention discloses a method for controlling a structure of a plurality of input-series and output-parallel converters, which comprises the following steps: providing N converters of the structure, wherein the inputs of the N converters are connected in series and the outputs of the N converters are connected in parallel; ensuring that each of the N converters has an interval working period, an interval working time segment and an interval working duty ratio, wherein the ratio of the interval working time segment to the interval working period is the interval working duty ratio; and making the N converters work alternately in the interval working period, wherein the N is an integer of more than or equal to 2.
Description
Technical field
The present invention discloses a kind of control method of structure of a plurality of converters based on input-series and output-parallel, particularly works in staggered batch (-type) control method under underloading or the idle mode when the converter of this structure, with the efficient of the converter that improves this structure.
Background technology
The development trend of DC/DC converter develops towards high efficiency direction as most power supply product.The high efficiency here not only requires to realize when nominal load, also requires in full-load range, promptly is downloaded on the lenient side in the fully loaded scope to realize.This is just to the efficient of DC/DC converter, and especially the efficient during underloading is had higher requirement.
Adopt the framework of a plurality of DC/DC converter inputs, output parallel connection, and close when underloading wherein that the way of portion convertor can improve the efficient of whole converter when underloading effectively, this method is called as cut (phase shedding) control method.
What Fig. 1 showed is the framework of a kind of a plurality of DC/DC converter input series connection, output-parallel, and wherein these a plurality of DC/DC converters can or be controlled resonant converter for pwm converter.As shown in Figure 1 converter 1,2 ..., the n input connects in proper order receiving input voltage vin, and each converter input be parallel with corresponding input capacitance C1, C2 ..., Cn; Converter 1,2 ..., the output of n is parallel to output capacitance Co so that output voltage V o to be provided.This framework is fit to be applied in the high voltage input, the occasion of big electric current output.Simultaneously, to have the characteristic of each converter load of automatic equalization be that the DC component of each converter input current is identical to this framework.Yet because the connected mode of input series connection can't directly be carried out cut control between each converter.With two input series connection shown in Figure 2, the DC/DC converter of output-parallel is that example illustrates this problem below:
As shown in Figure 2, converter 1 and 2 inputs are connected in series in proper order with the reception input voltage vin, and corresponding dividing potential drop capacitor C 1, and C2 is parallel to the input of converter 1 and 2; Converter 1 and 2 output are connected in parallel so that output voltage V o to be provided.Wherein, Iin1 and Iin2 are respectively the DC component of the input current of converter 1 and 2, and Vin1 and Vin2 are respectively the voltage on dividing potential drop capacitor C 1 and the C2, and its DC component is expressed as Vin1_d and Vin2_d respectively.Under the sort circuit structure, according to different design requirements, each converter all exist one can operate as normal scope.At this moment, thus the input voltage of each converter exists a maximum Vmax and minimum value Vmin to guarantee that converter works normally in this input voltage range.Wherein the scope of input voltage is to obtain with requirements such as design requirement of exporting and element stress according to each converter input.
In the equal operate as normal of two converters and reach under the situation of stable state, Iin1=Iin2, the DC component of electric current is 0 among C1 and the C2, direct voltage Vin1_d and Vin2_d remain unchanged.If under certain loading condition, for example: under the underloading condition, close converter 1, then Iin1=0 causes direct current to flow through capacitor C 1 and C2, and C1 is charged, and C2 is discharged, and Vin1 rises, and Vin2 descends.When Vin2 drops to when being lower than converter 2 input voltage ranges, converter 1 and 2 is all with cisco unity malfunction.
Therefore at These characteristics under the framework of a plurality of converter input series and output parallel, the present invention proposes the generation that a kind of novel controlling schemes can be avoided the problems referred to above, can effectively improve this framework again under the certain loads condition, for example the efficient of underloading.
Because of above-mentioned reason, the inventor improves prior art in view of the defective of known technology, invents out " control method of the structure of a plurality of converters of input-series and output-parallel " of the present invention.
Summary of the invention
Main purpose of the present invention is to provide a kind of staggered batch (-type) control method of structure of a plurality of converters based on input-series and output-parallel, works in efficient under underloading or the idle mode to improve converter when this structure.
Another main purpose of the present invention is to provide a kind of control method of a structure of a plurality of converters that are used for input series and output parallel, comprises following step: provide this structure N converter, wherein the input series connection and the output-parallel of this N converter; Make this N converter respectively have a discontinuous operation cycle, a discontinuous operation time period and an interval working duty ratio, wherein this discontinuous operation time period was this interval working duty ratio than last this discontinuous operation cycle; And make this N converter with this discontinuous operation cycle alternation, wherein N is the integer more than or equal to 2.
According to above-mentioned method, N equals 2.
According to above-mentioned method, at least 2 converters of this N converter transmit identical power.
According to above-mentioned conception, this method also comprises a step: make the discontinuous operation cycle of these at least 2 converters identical.
According to above-mentioned method, this discontinuous operation time period complementation of these at least 2 converters.
According to above-mentioned method, this discontinuous operation time period of these at least 2 converters overlaps.
According to above-mentioned method, there is a Dead Time section in this discontinuous operation time period of these at least 2 converters.
According to above-mentioned method, this method also comprises a step: make the discontinuous operation cycle of these at least 2 converters inequality.
According to above-mentioned method, at least 2 converters of this N converter transmit different power.
Another main purpose of the present invention is to provide a kind of control method of a structure of a plurality of converters that are used for input series and output parallel, comprises following step: provide this structure N converter, wherein the input series connection and the output-parallel of this N converter; Make that at least one converter has a big discontinuous operation cycle and the little discontinuous operation cycle in this N converter; And make this at least one converter in an operating time section in this big discontinuous operation cycle, according to this little discontinuous operation cycle discontinuous operation, wherein N is the integer more than or equal to 2.
According to above-mentioned conception, this method also comprises a step: make this N converter all have a big discontinuous operation cycle and the little discontinuous operation cycle, and each converter is in an operating time section in this big discontinuous operation cycle, according to this little discontinuous operation cycle discontinuous operation.
According to above-mentioned method, this method also comprises a step: make respectively should the operating time section not overlapping each other of this N converter.
According to above-mentioned method, this method also comprises a step: what make this N converter should the operating time section be partly overlapping each other respectively.
According to above-mentioned method, this method also comprises a step: make respectively should the operating time section not overlapping each other of this N converter, and have a Dead Time section.
Next main purpose of the present invention is to provide a kind of control method of a structure of a plurality of converters that are used for input series and output parallel, comprises following step: provide this structure N converter, wherein the input series connection and the output-parallel of this N converter; Make this N converter all have an interval working duty ratio: k/N, wherein 0＜k≤N and N are the integer more than or equal to 2; And make have an average k converter to work simultaneously by synchronization in this N converter.
According to above-mentioned method, k is a positive integer.
According to above-mentioned method, each converter all has a discontinuous operation period T, and the operating time section in the intermittent time section: (k/N)
*T.
According to above-mentioned method, this method also comprises a step: make an initial time difference of the operating time section in this intermittent time section between any two adjacent converters in this N converter be (1/N)
*T.
Description of drawings
Fig. 1 is the circuit diagram of structure of a plurality of DC/DC converters of a known input series and output parallel;
Fig. 2 is the circuit diagram of structure of two DC/DC converters of a known input series and output parallel;
Fig. 3 (a)～(c) be one according to first to the 3rd preferred embodiment of the present invention conception when the delivering power of two DC/DC converters among Fig. 2 the associated voltage and the enable signal oscillogram of the control method when identical and discontinuous operation cycle is identical;
Fig. 4 be one according to the 4th preferred embodiment of the present invention conception in Fig. 2 the associated voltage and the enable signal oscillogram of the identical and asynchronous control method of discontinuous operation cycle of the delivering power of two DC/DC converters;
Fig. 5 (a)～(b) be one according to the 5th to the 6th preferred embodiment of the present invention conception the associated voltage and the enable signal oscillogram of the control method when the delivering power difference of two DC/DC converters among Fig. 2 and discontinuous operation cycle are identical;
Fig. 6 (a)～(c) one all comprises the enable signal oscillogram of the control method of two discontinuous operations during the cycle when two DC/DC converters among Fig. 2 according to the 7th to the 9th preferred embodiment of the present invention conception; And
Fig. 7 (a)～(b) is the enable signal oscillogram of a control method that a plurality of DC/DC converters switch mutually in Fig. 1 according to the tenth to the 11 preferred embodiment of the present invention conception.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
In the framework shown in Figure 2, the average power of two converter transmission can have different combinations, and for example converter 1 can be identical with 2 power that transmit, also can be different.Suppose that converter 1 and 2 average powers that transmit are respectively P1, P2, then P1=Vin1_d
*Iin1, P2=Vin2_d
*Iin2.Because Iin1=Iin2, Vin1_d/Vin2_d=P1/P2 then, promptly the DC quantity of input voltage is directly proportional with the average power of transmission.
It is identical that control method shown in Fig. 3 (a)-(c) is based on the average power that two converters transmit in Fig. 2 framework, i.e. the condition of P1=P2, that is Vin1_d=Vin2_d.Setting Vin1_d=Vin2_d earlier under control method shown in Figure 3 is Vcenter, and Vcenter=Vin/2.Vmax is the maximum input voltage that each converter can bear among Fig. 3 (a)-(c), and Vmin is the required minimum voltage of each converter operate as normal.EN1 and EN2 are respectively the enable signal of converter 1 and converter 2, because of being that high potential enables, and when EN1 or EN2 are high potential, corresponding converter 1 or 2 work.
Control method one shown in Fig. 3 (a) is first preferred embodiment of the present invention, two converter alternations, and the time period of work do not have overlappingly, promptly any has only a converter job constantly.T0～t1 is in the time period, and enable signal EN2 is a high potential, converter 2 work this moment, and converter 1 is not worked, so Vin2 descends the Vin1 rising; T1～t2 is in the time period, and enable signal EN1 is a high potential, converter 1 work this moment, and converter 2 is not worked, so Vin1 descends the Vin2 rising.Vin1 and Vin2 all fluctuate up and down at Vcenter, but are no more than by Vmax and Vmin institute restricted portion.Wherein t0～t2 time period is a discontinuous operation cycle, and (t1～t2) is the operating time section in a discontinuous operation cycle to t0～t1.Shown in Fig. 3 (a), converter 1 is identical with 2 discontinuous operation frequency, and operating time section separately also is all 50% of a discontinuous operation cycle mutually, and promptly interval working duty ratio separately (operating time section/discontinuous operation cycle) is 50%.Can be implemented in arbitrary moment in this way has only a converter in work, thus the efficient when having improved the converter underloading, but and the input voltage that guarantees each converter all within the scope of operate as normal and safety.
Control method two shown in Fig. 3 (b) is second preferred embodiment of the present invention, two converter alternations, but have one two period that converter is all worked between the working hour of two converters, promptly the operating time section in the discontinuous operation cycle of two converters has crossover.In time period, converter 1 and 2 is worked simultaneously at t0～t1 and t2～t3; In t1～t2 only converter 2 work in the time period, its input voltage vin 2 descends and input voltage vin 1 rising of converter 1; In t3～t4 only converter 1 work in the time period, its input voltage vin 1 descends, and the input voltage vin 2 of converter 2 rises.Shown in Fig. 3 (b), converter 1 is identical with 2 discontinuous operation frequency, be the inverse of discontinuous operation cycle t0～t4, and the operating time section in its discontinuous operation cycle separately is also identical, equal t0～t3, account for more than 50% of whole discontinuous operation cycle, promptly interval working duty ratio separately is greater than 50%.
Control method three shown in Fig. 3 (c) is the 3rd preferred embodiment of the present invention, two converter alternations, but have one two all idle period of converter between the working hour of two converters, promptly the operating time section in the discontinuous operation cycle of two converters does not have crossover.In t0～t1 only converter 2 work in the time period, its input voltage vin 2 descends and input voltage vin 1 rising of converter 1; In t2～t3 only converter 1 work in the time period, its input voltage vin 1 descends and input voltage vin 2 risings of converter 2; In t1～t2 and t3～t4 time period, when two converters were not all worked, Vin1 and Vin2 all remained unchanged.Equally, Vin1 and Vin2 all fluctuate up and down at Vcenter, but are no more than by Vmax and Vmin institute restricted portion.Shown in Fig. 3 (c), converter 1 is identical with 2 discontinuous operation frequency, is the inverse of discontinuous operation cycle t0～t4.And the operating time in the discontinuous operation cycle of two converters is identical, but is below 50% of discontinuous operation cycle, and promptly interval working duty ratio separately is less than 50%.
Be different from the control method shown in Fig. 3 (a)-(c), converter 1 all is identical with 2 discontinuous operation frequency, and in the 4th preferred embodiment shown in Figure 4, converter 1 and 2 discontinuous operation frequency are also inequality.As shown in Figure 4, t0～t2 time period is a discontinuous operation cycle of converter 1, and t0～t6 time period is a discontinuous operation cycle of converter 2, and the discontinuous operation frequency of converter 1 is 3 times of converter 2 like this.Wherein at t0～t1, t2～t3 time period inner conversion device 1 and 2 is worked simultaneously; Work independently at t1～t2 time period inner conversion device 2; At t3～t4, two converters are not worked in t5～t6 time period; Work independently at t4～t5 time period inner conversion device 1.
Among the embodiment described above, converter 1 is identical with 2 power that transmit.Preferred embodiment shown in Fig. 5 (a)-(b) is the control method under converter 1 and the 2 power different situations that transmit.Identical among Fig. 5 (a)-(b) among the meaning of identical label representative and the front embodiment.In the preferred embodiment shown in Fig. 5 (a)-(b), converter 1 is identical with 2 discontinuous operation frequency, but its intermittently used duty ratio difference, and is directly proportional with the average power of its transmission.
Fig. 5 (a) is depicted as the 5th preferred embodiment of the present invention.Converter 1 is identical with 2 discontinuous operation cycle, all is t0～t2 time period.In time period, only converter 1 is worked at t0～t1, and the input voltage vin 2 of converter 2 rises; In time period, only converter 2 is worked at t1～t2, and the input voltage vin 2 of converter 2 descends.
Fig. 5 (b) is depicted as the 6th preferred embodiment of the present invention.Converter 1 is identical with 2 discontinuous operation cycle, all is t0～t4 time period.In time period, only converter 1 is worked at t0～t1, and the input voltage vin 2 of converter 2 rises; In time period, only converter 2 is worked at t2～t3, and the input voltage vin 2 of converter 2 descends; At t1～t2, t3～t4 is in the time period, and converter 1 and 2 is not worked, and the input voltage vin 2 of converter 2 remains unchanged.
In the control method shown in Fig. 3 (a)-(c), in the operating time of resting period section, all continuous operations of each converter.If also interrupter duty of each converter in the operating time in each converter discontinuous operation cycle section just becomes the control method shown in Fig. 6 (a)-(c), such two converters have all comprised two discontinuous operation cycles.
The 7th preferred embodiment of the present invention shown in Fig. 6 (a), t0～t2 time period is a discontinuous operation period T 1 of converter 2, wherein t0～t1 time period is the operating time of this discontinuous operation period T 1; At t0～t3 time period inner conversion device 2 with discontinuous operation period T 1 discontinuous operation, and quit work at t3～t4 time period inner conversion device 2, therefore t0～t4 time period can be seen as a big discontinuous operation period T 2 of converter 2, and wherein t0～t3 time period is the operating time in this discontinuous operation period T 2.Same converter 1 also exists a little discontinuous operation cycle and a big discontinuous operation cycle.Shown in Fig. 6 (a), the operating time section in the discontinuous operation cycle that it is big is nonoverlapping, but complementary.
Fig. 6 (b) is depicted as the 8th preferred embodiment of the present invention, and the embodiment difference shown in itself and Fig. 6 (a) is that the operating time section in big discontinuous operation cycle is partly overlapping.
Fig. 6 (c) is depicted as the 9th preferred embodiment of the present invention, and the embodiment difference shown in itself and Fig. 6 (a) is that the operating time section in big discontinuous operation cycle does not only have an overlapping Dead Time section such as the t3～t4 of also existing.
In like manner, in the control method shown in Fig. 4 and Fig. 5 (a)-(b), also can make any one converter discontinuous operation in the operating time section in the cycle of doing of knocking off betwixt, this converter has just comprised two discontinuous operation cycles like this.
Said method can expand in the transformer configuration of as shown in Figure 1 a plurality of input series connection, output-parallel.Method shown in Fig. 7 (a) is the tenth preferred embodiment of the present invention.Setting converter quantity is n, and among Fig. 7 (a), the discontinuous operation cycle of each converter is T, and the operating time section in the one discontinuous operation cycle is
Be that interval working duty ratio is
For example, converter 1 is operated in
Converter 2 is operated in
Converter n is operated in
With
Wherein m is a positive integer, 1≤m≤n.Can be implemented in synchronization only has m converter to work simultaneously.Work as n=2, during m=1, this method is the control method shown in Fig. 3 (a).
In the method shown in Fig. 7 (a), m is an integer, and can be implemented in synchronization has m converter to work simultaneously just.Method shown in Fig. 7 (b) is the 11 preferred embodiment of the present invention.Wherein k is an any number between 0～n, and alternation and operating time are each converter successively in period T
Be that interval working duty ratio is
Can guarantee like this that in period T the converter number of work is k in the time of average.Work as n=2,1＜k＜2 o'clock, this method is the control method shown in Fig. 3 (b).Work as n=2,0＜k＜1 o'clock, this method is the control method shown in Fig. 3 (c).
In sum, the present invention has disclosed a kind of staggered batch (-type) control method of a structure of a plurality of converters based on input series and output parallel, work in efficient under underloading or the idle mode to improve converter when this structure, thereby its progressive and novelty are arranged really.
Be with, though the present invention is described in detail by the above embodiments, and can be changed, all within claim scope of the present invention by the person skilled in the art.
Claims (10)
1, a kind of control method of a structure of a plurality of converters that are used for input series and output parallel comprises the following step:
Provide this structure N converter, wherein the input series connection and the output-parallel of this N converter;
Make this N converter respectively have a discontinuous operation cycle, a discontinuous operation time period and an interval working duty ratio, wherein this discontinuous operation time period was this interval working duty ratio than last this discontinuous operation cycle; And
Make this N converter with this discontinuous operation cycle alternation, wherein N is the integer more than or equal to 2.
2, the method for claim 1 is characterized in that, described N equals 2.
3, the method for claim 1 is characterized in that, at least 2 converters of this N converter transmit identical power.
4, method as claimed in claim 3 is characterized in that, also comprises a step: make the discontinuous operation cycle of these at least 2 converters identical, wherein:
This discontinuous operation time period complementation of these at least 2 converters;
This discontinuous operation time period of these at least 2 converters overlaps; Or
There is a Dead Time section in this discontinuous operation time period of these at least 2 converters.
5, method as claimed in claim 3 is characterized in that, also comprises a step: make the discontinuous operation cycle of these at least 2 converters inequality.
6, the method for claim 1 is characterized in that, wherein:
At least 2 converters of this N converter transmit different power;
This method also comprises a step: make the discontinuous operation cycle of these at least 2 converters identical, wherein:
This discontinuous operation time period complementation of these at least 2 converters; Or
There is a Dead Time section in this discontinuous operation time period of these at least 2 converters.
7, a kind of control method of a structure of a plurality of converters that are used for input series and output parallel comprises the following step:
Provide this structure N converter, wherein the input series connection and the output-parallel of this N converter;
Make that at least one converter has a big discontinuous operation cycle and the little discontinuous operation cycle in this N converter; And
Make this at least one converter in an operating time section in this big discontinuous operation cycle, according to this little discontinuous operation cycle discontinuous operation, wherein N is the integer more than or equal to 2.
8, method as claimed in claim 7, it is characterized in that, also comprise a step: make this N converter all have a big discontinuous operation cycle and the little discontinuous operation cycle, and each converter is in an operating time section in this big discontinuous operation cycle, according to this little discontinuous operation cycle discontinuous operation, wherein this method also comprises a step:
Make respectively should the operating time section not overlapping each other of this N converter;
What make this N converter should the operating time section be partly overlapping each other respectively; Or
Make respectively should the operating time section not overlapping each other of this N converter, and have a Dead Time section.
9, a kind of control method of a structure of a plurality of converters that are used for input series and output parallel comprises the following step:
Provide this structure N converter, wherein the input series connection and the output-parallel of this N converter;
Make this N converter all have an interval working duty ratio: k/N, wherein 0＜k≤N, and N is the integer more than or equal to 2; And
Make and have an average k converter to work simultaneously by synchronization in this N converter.
10, method as claimed in claim 9 is characterized in that, wherein:
K is a positive integer; Or
Each converter all has a discontinuous operation period T, and the operating time section in the intermittent time section: (k/N) * T, and this method also comprises a step: make an initial time difference of the operating time section in this intermittent time section between any two adjacent converters in this N converter be (1/N) * T.
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| CN102035416A (en) * | 2010-12-14 | 2011-04-27 | 北京理工大学 | Method for controlling power equipartition of input-series output-series high-frequency link inverters |
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| CN1047176A (en) * | 1990-05-04 | 1990-11-21 | 杨彬 | Capacitance voltage-regulating DC power supply |
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| US9837921B2 (en) | 2014-09-08 | 2017-12-05 | Infineon Technologies Austria Ag | Multi-cell power conversion method and multi-cell power converter |
| CN105743372A (en) * | 2016-04-21 | 2016-07-06 | 张心益 | Power conversion device of input power supply during superposed DC charging |
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| CN112187090A (en) * | 2020-08-25 | 2021-01-05 | 南京工业大学 | IPOx framework type high-voltage microsecond pulse power supply based on energy efficiency and stability design model |
| CN112187090B (en) * | 2020-08-25 | 2022-06-14 | 南京工业大学 | IPOx framework type high-voltage microsecond pulse power supply based on energy efficiency and stability design model |
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