CN113014089A - Halving boosting type high-boost ratio DC/DC converter - Google Patents

Halving boosting type high-boost ratio DC/DC converter Download PDF

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CN113014089A
CN113014089A CN202110273589.2A CN202110273589A CN113014089A CN 113014089 A CN113014089 A CN 113014089A CN 202110273589 A CN202110273589 A CN 202110273589A CN 113014089 A CN113014089 A CN 113014089A
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voltage
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张超
张加胜
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a novel circuit topology for a split-boost type high step-up ratio DC/DC converter, which is realized by dispersing high-output direct-current voltage to two mutually-antisymmetric buck-boost units for output series connection, and the input ends of the two buck-boost units are connected in parallel and share the same input voltage source, so that the voltage, current stress and switching loss of a power device are reduced, the high step-up ratio DC/DC conversion efficiency is increased, and the output power and voltage regulation range are widened. The conversion circuit outputs a voltage UdSymmetrically staggered half-cycle regulation T by a switching controller1、T2The PWM duty ratio of the two switching tubes. The two switching tubes are symmetrically staggered and are conducted in a half-period alternate mode, so that the ripple frequency of the output voltage reaches 2 times of the switching frequency, the ripple wave of the output direct-current voltage is favorably reduced, and the capacity and the volume of an output capacitor are reduced. Is suitable forAnd the direct-current working voltage and the boost ratio of the new energy photovoltaic power generation, the direct-current micro-grid and the like have higher requirements on power electronic direct-current conversion application occasions.

Description

Halving boosting type high-boost ratio DC/DC converter
Technical Field
The invention relates to a novel circuit topology structure of a split-boost type high-step-up-ratio DC/DC converter, belonging to the technical field of power electronic conversion and new energy power generation.
Background
In a photovoltaic power generation and grid-connected system, a Boost type DC/DC converter is generally adopted to convert a lower photovoltaic cell voltage to a DC bus or DC microgrid with a higher voltage level, and then the DC bus or DC microgrid is supplied to an independent ac load through an inverter or fed to an ac grid through a grid-connected inverter.
The traditional Boost type DC/DC converter realizes Boost conversion by adjusting the duty ratio, the Boost ratio of the traditional Boost type DC/DC converter can be theoretically changed within the range of 1 to a limit, but actually when the Boost ratio exceeds about 4, the reverse recovery loss of a diode and the turn-off loss of a switching tube are increased along with the increase of the duty ratio, the system efficiency is obviously reduced, particularly, the problem of the Boost converter with larger power is more prominent, and the Boost ratio is limited to about 4 in general practical application.
Although the output power of the existing staggered control double-Boost type direct current converter is increased and input and output ripples are reduced, because the input and the output of the double-Boost are connected in parallel, the voltage and the current stress of each switching tube and each diode in the circuit are the same as those of the traditional Boost converter. In a distributed photovoltaic power generation grid-connected system, the invention of the high-efficiency DC/DC converter with the high step-up ratio has important practical significance.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a split boost DC/DC converter having a high boost ratio. The invention provides a direct current converter aiming at an obvious defect of a traditional Boost type DC/DC converter, namely, although the Boost ratio of the direct current converter can be changed within a range of 1 to a limit in theory by adjusting the duty ratio, in fact, when the Boost ratio is higher, the device loss is increased along with the increase of the duty ratio, the system efficiency is obviously reduced, and the output power is also limited. The technical scheme adopted by the invention is as follows:
a split boost high step-up ratio DC/DC converter comprising: the high-output direct-current voltage is dispersed to the N similar buck-boost units to be output and connected in series, N is an integer larger than 1, the input ends of the N similar buck-boost units are connected in parallel, share the same input voltage source, and output direct-current voltage ripple waves are reduced by performing staggered PWM control on the N similar buck-boost units.
Specifically, the invention provides a novel circuit topology structure of a split boost type high step-up ratio DC/DC converter, which is realized by dispersing high-output direct-current voltage to two boost and buck units which are mutually antisymmetric and serially connected, the input ends of the two boost and buck units are connected in parallel and share the same input voltage source, and output direct-current voltage ripple waves are reduced by symmetrically staggering half-period PWM control on the two boost and buck units, so that the voltage, current stress and switching loss of a power device are reduced, the high step-up ratio DC/DC conversion efficiency is increased, and the output power and voltage regulation range is widened.
Aiming at the technical problems of the traditional Boost type DC/DC converter, the specific technical scheme adopted by the invention is summarized as follows:
a pair of split-boost DC/DC converter with high boost ratio comprises a boost-buck conversion unit, a boost-buck dual conversion unit, an input direct-current voltage source branch and an output direct-current voltage branch;
the buck-boost conversion unit takes an input power supply E as a direct current input voltage source and comprises a first switching tube T1First diode D1First inductance L1First capacitor C1；C1Positive polarity terminal connected with the first diode D1Cathode terminal of (D)1Anode of the first switch tube T1Collector electrode of, the first switching tube T1The emitting electrode of the power supply is connected with the negative end of an input power supply E, and the positive end of the input power supply E is connected with the positive end C1Negative terminal, first inductance L1Is bridged on the first switch tube T1Between the collector of (a) and the anode of the input power supply E;
the buck-boost dual conversion unit also takes an input power supply E as a direct current input voltage source and comprises a second switching tube T2A second diode D2Second inductance L2A second capacitor C2；C2Negative terminal connected with the second diode D2Anode terminal of, D2The cathode of the first switch tube is connected with the second switch tube T2Emitter of, the second switching tube T2The collector of the transformer is connected with the positive end of an input power supply E, and the negative end of the input power supply E is connected with the terminal C2Positive polarity terminal, second inductance L2Is connected across the second switch tube T2Between the emitter of (a) and the negative pole of the input power supply E;
the input direct-current voltage source branch consists of an input power supply E and is used as a direct-current input voltage source shared by the buck-boost conversion unit and the buck-boost dual conversion unit;
an output DC voltage branch circuit including a first capacitor C1An input power source E and a second capacitor C2(ii) a Single dc output voltage UdFormed by connecting three elements in series in the same polarity of direct-current terminal voltage, i.e. a first capacitor C1As the output voltage UdThe positive polarity terminal of (1) is directly connected with a load, C1Is connected with the positive end of an input power supply E, and the negative end of the input power supply E is connected with a second capacitor C2Positive polarity terminal of (1), C2As the output voltage UdThe negative polarity end of the load is connected with the other end of the load.
First switching tube T of split-boost type high-step-up ratio DC/DC converter1And a second switching tube T2The typical symmetric control mode is two switch tubes T1And T2The PWM control period and the duty ratio are the same, but the half period is staggered on the phase, and two switching tubes T1And T2The PWM duty ratio regulating range is 0-1, and the output voltage UdStaggered half-cycle regulation T by a converter controller1、T2The PWM duty ratio of the two switching tubes.
Two split-boost type high-boost ratio DC/DC converterClosing pipe T1And T2The PWM control period and the duty ratio are the same in a typical symmetrical control mode, and the direct-current voltage U is output under the control mode of continuous inductive currentdThe step-up ratio M (or voltage conversion ratio) between the dc input power E and the dc input power E is:
Figure BDA0002974194990000031
in which d is T1、T2PWM duty ratio of two switching tubes.
First switching tube T of split-boost type high-step-up ratio DC/DC converter1And a second switching tube T2Or two switch tubes T in different control modes1And T2The PWM control period and the duty ratio can be different and are respectively and independently controlled.
The invention has the beneficial effects that:
1. aiming at the defects of the traditional Boost type DC/DC converter, the invention provides a split Boost type high Boost ratio DC/DC converter which can effectively reduce the voltage, current stress and switching loss of a power device and increase the high Boost ratio DC/DC conversion efficiency.
2. The circuit structure has a single direct current input power voltage and a single direct current output voltage, and the output voltage is determined by adjusting the PWM duty ratio of two switching tubes through the staggered half cycle of a conversion controller. The two switching tubes are alternatively conducted under the control of the conversion controller, so that the output ripple is favorably reduced, and the output voltage ripple frequency is 2 times of the switching frequency, thereby reducing the capacity and the volume of the output capacitor. The method is suitable for power electronic DC/DC conversion application occasions with high requirements on DC rated working voltage and boosting ratio, such as new energy photovoltaic power generation and a DC micro-grid.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the following drawings:
fig. 1 is a schematic diagram of a binary boost high step-up ratio DC/DC converter circuit according to the present invention: FIG. 1a is a circuit diagram of a buck-boost DC converter; fig. 1b is a circuit diagram of buck-boost reverse polarity dual conversion circuit.
Fig. 2 is a circuit topology diagram of a split boost type high step-up ratio DC/DC converter.
Fig. 3 is a schematic structural diagram of a control system for applying a split-boost high step-up ratio DC/DC converter to photovoltaic power generation grid-connected inversion.
Detailed Description
Aiming at the defects of the traditional Boost type DC/DC converter, the invention provides a novel circuit topological structure of the split Boost type high Boost ratio DC/DC converter, which reduces the voltage, current stress and switching loss of a power device, increases the high Boost ratio DC/DC conversion efficiency and widens the output power and voltage regulation range. The method is suitable for power electronic DC/DC conversion application occasions with high requirements on DC rated working voltage and boosting ratio, such as new energy photovoltaic power generation and a DC micro-grid.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Aiming at the problem to be solved, the invention provides a scheme according to the following thought:
as shown in fig. 1a, the circuit topology of the buck-boost dc converter is that energy should be transferred from an input voltage source E to a capacitor C by setting the PWM control duty ratio of a switching tube to d1Voltage Ud1And (3) transmission, wherein the input-output voltage conversion ratio expression in the current continuous mode is analyzed as follows:
Figure BDA0002974194990000041
since d ≦ 1 and the voltage conversion ratio is equal to 1 when d is 0.5, the converter is usually provided with a buck (d ≦ 1)<0.5) and also has a boosting effect (d)>0.5). In addition, if consideration is given to connecting the output terminal load across the capacitor C1Voltage Ud1And above the input voltage source E, i.e. outputting a DC voltage UdE＝Ud1+ E, as shown in fig. 1a, the input-output voltage conversion ratio in the current continuous mode will be converted from the step-up/step-down conversion into a step-up conversion relationship (same as the conventional Boost dc converter):
Figure BDA0002974194990000042
FIG. 1b shows a buck-boost DC converter circuit topology having a reverse polarity duality structure to that of FIG. 1a, wherein energy is transferred from an input voltage source E to a capacitor C2Voltage Ud2The voltage conversion ratio expression in current continuous mode is easily analyzed as in FIG. 1a, including consideration of the output load across capacitor C2Voltage Ud2And above the input voltage source E, i.e. the output DC voltage UdE＝Ud2+E。
In the circuit topologies of the buck-boost dc converter with the dual structure of opposite polarities shown in fig. 1a and fig. 1b, it can be considered that the input ends of two buck-boost circuit units that are opposite symmetric to each other are combined in parallel to share the same input voltage source E, and two output dc voltages U are outputd1And Ud2A series combination is formed by this series and parallel combination, with the input supply E also being part of the output voltageThe special effect is realized by dispersing high-output direct-current voltage to two anti-symmetric buck-boost unit outputs which are connected in series. The resulting split boost high step-up ratio DC/DC converter circuit topology is shown in fig. 2. From formula (1) and considering UdThe conversion ratio of input and output voltages of the two units in a current continuous mode with symmetrical and equal parameters can be obtained by considering the halved output of the two units as follows:
Figure BDA0002974194990000051
wherein, because d is less than or equal to 1, when d is 0, the voltage conversion ratio M is 1; when d is 0.2, the boosting ratio M is 1.5; when d is 0.5, the boosting ratio M is 3; when d is 0.95, the boosting ratio M is 39; when d is 0.98, the boosting ratio M is 99; when d is 0.99, the step-up ratio M is 199. The ratio of the equation (4) to the equation (3) is 1+ d, that is, the step-up ratio of the split step-up converter is higher than that of the conventional Boost converter by a factor d, which indicates that the ratio of the step-up ratio is increased with the increase of the duty ratio and can approach 100% at most.
FIG. 2 shows a split-boost DC/DC converter with high step-up ratio and a switching tube T1And T2IGBT or VDMOSFET fast full-control devices can be selected; diode D1And D2A high-voltage fast recovery power diode is adopted; capacitor C1And C2The electrolytic capacitor is selected, the connection direction of the polarity of the electrolytic capacitor is noticed, and other non-polar capacitors with larger capacity can be selected; inductor L1And L2Because the PWM switching frequency is high, the inductance selection value is usually small, and ferrite, amorphous alloy, etc. with high frequency can be selected as the core inductance of the magnetic conductive medium, and a certain air gap needs to be left in the core in view of the fact that the inductive current contains dc component.
The first application embodiment:
fig. 3 shows a system structure of an embodiment of applying the split-boost high-step-up ratio DC/DC converter to photovoltaic power generation. In view of the fact that the direct-current side voltage requirement of a grid-connected inverter is high in general, the system is suitable for a split-boost high-step-ratio DC/DC converter. Due to the fact that the boost ratio is high, when photovoltaic power generation grid-connected inversion is implemented, a photovoltaic battery array with low voltage can be selected and directly connected to the input side of the split boost type DC/DC converter. A typical closed loop control system is shown in figure 3.
If the grid-connected voltage at the alternating current side is set to be 50Hz, the three-phase line voltage is 380V (or the single-phase voltage is 220V), and the boosting coefficient at the direct current side of the grid-connected inverter is 1.12, the lower limit value requirement of the direct current side voltage of the grid-connected inverter is as follows:
Figure BDA0002974194990000052
in practice, it should be 10% higher than the tolerance, so UdTaking about 680V.
A monocrystalline silicon photovoltaic module with power of 315W is selected, and the maximum working voltage is 33.2V. Considering the DC side voltage U of the grid-connected inverterdTaking 680V as a value, considering that the boost ratio of the split boost DC/DC converter is about M7, the output voltage U of the photovoltaic cell supplying power to the split boost DC/DC converter is obtainedpvLower limit value Upvmin97V, rated power 30 kW. The number of photovoltaic arrays in series can be calculated as: 97V/33.2V is 2.92, approximately integrates 3 blocks, and the direct-current working voltage of the nuclear meter is 99.6V; determining the total number of the photovoltaic modules according to rated power: and 30000W/315W is 95.2, and approximately an integer of 96 blocks, the number of parallel strings is 32, and the whole photovoltaic cell panel is a 32 × 3 array.
As shown in fig. 3, the control system for applying the split-boost high step-up ratio DC/DC converter to photovoltaic power generation and grid-connected inversion is shown, and the outer ring of the control system on the left side in the figure is a Maximum Power Point Tracking (MPPT) control ring for photovoltaic power generation, considering the output voltage U of the photovoltaic cell array PVpvDirectly as a split boost converter dc input power, where split boost converter input voltage control is combined with Maximum Power Point Tracking (MPPT) control of photovoltaic power generation. The system obtains a voltage instruction reference signal U of a photovoltaic cell working point through a specific MPPT control algorithm according to the detected output voltage and current of the photovoltaic cellpvrThe sampling feedback signal U is compared with the output voltage of the photovoltaic cellPVThe deviation signal obtained by comparison is sent to a voltage controller (PI) and regulated by the staggered half-cycle PWM duty ratio, so that the load characteristic of the photovoltaic cell and the output volt-ampere characteristic thereofThe performance reaches the best matching, and MPPT control of the photovoltaic cell is realized. The controller typically employs a PI regulator whose output represents the PWM duty cycle. The system is in a steady state Upv＝UpvrThe input deviation signal of the PI regulator is zero, and the output duty ratio control signal of the PI regulator corresponds to the output current of the photovoltaic cell, so that the effects of automatic tracking of the maximum power point of photovoltaic power generation and inverse network access are achieved.
Fig. 3 shows a schematic diagram of a typical grid-connected inverter dual closed-loop control system on the right side. The grid-connected inverter can control the alternating current side current i through an independent grid-connected inverter controller, a proper current tracking control algorithm and synchronous PWMkWaveform and given signal i thereofkrThe transient waveform (including all three elements of the sinusoidal current) meets the purpose. The specific control process is omitted. In view of various performance requirements of an alternating current side and a direct current side, a grid-connected inverter belongs to a typical multivariable nonlinear control object, namely, the voltage U of the direct current side is controlleddAnd controlling the current i on the AC sidekPhase and instantaneous waveform and power flow direction.

Claims (6)

1. A split boost high step-up ratio DC/DC converter comprising: the high-output direct-current voltage is dispersed to the N similar buck-boost units to be output and connected in series, N is an integer larger than 1, the input ends of the N similar buck-boost units are connected in parallel, share the same input voltage source, and output direct-current voltage ripple waves are reduced through staggered PWM control of the N similar buck-boost units.
2. The split boost high step-up ratio DC/DC converter of claim 1, comprising: the device comprises a buck-boost conversion unit, a buck-boost dual conversion unit, an input direct-current voltage source branch and an output direct-current voltage branch;
the buck-boost conversion unit takes an input power supply E as a direct current input voltage source and comprises a first switching tube T1First diode D1First inductance L1First capacitor C1；C1Positive polarityTerminating the first diode D1Cathode terminal of (D)1Anode of the first switch tube T1Collector electrode of, the first switching tube T1The emitting electrode of the power supply is connected with the negative end of an input power supply E, and the positive end of the input power supply E is connected with the positive end C1Negative terminal, first inductance L1Is bridged on the first switch tube T1Between the collector of (a) and the anode of the input power supply E;
the buck-boost dual conversion unit also takes an input power supply E as a direct current input voltage source and comprises a second switching tube T2A second diode D2Second inductance L2A second capacitor C2；C2Negative terminal connected with the second diode D2Anode terminal of, D2The cathode of the first switch tube is connected with the second switch tube T2Emitter of, the second switching tube T2The collector of the transformer is connected with the positive end of an input power supply E, and the negative end of the input power supply E is connected with the terminal C2Positive polarity terminal, second inductance L2Is connected across the second switch tube T2Between the emitter of (a) and the negative pole of the input power supply E;
the input direct-current voltage source branch consists of an input power supply E and is used as a direct-current input voltage source shared by the buck-boost conversion unit and the buck-boost dual conversion unit;
the output DC voltage branch circuit comprises a first capacitor C1An input power source E and a second capacitor C2(ii) a Single dc output voltage UdFormed by connecting three elements in series in the same polarity of direct-current terminal voltage, i.e. a first capacitor C1As the output voltage UdThe positive polarity terminal of (1) is directly connected with a load, C1Is connected with the positive end of an input power supply E, and the negative end of the input power supply E is connected with a second capacitor C2Positive polarity terminal of (1), C2As the output voltage UdThe negative polarity end of the load is connected with the other end of the load.
3. The split boost high step-up ratio DC/DC converter as claimed in claim 2, wherein the first switching transistor T1And a second switching tube T2The typical symmetric control mode is two switch tubes T1And T2The PWM control period and the duty ratio are the same, but the half period is staggered on the phase, and two switching tubes T1And T2The PWM duty ratio regulating range is 0-1, and the output voltage UdStaggered half-cycle regulation T by a converter controller1、T2The PWM duty ratio of the two switching tubes.
4. The split boost high step-up ratio DC/DC converter as claimed in claim 2 or 3, wherein there are two switching tubes T1And T2The PWM control period and the duty ratio are the same in a typical symmetrical control mode, and the direct-current voltage U is output under the control mode of continuous inductive currentdThe step-up ratio M (or voltage conversion ratio) between the dc input power E and the dc input power E is:
Figure FDA0002974194980000021
in which d is T1、T2PWM duty ratio of two switching tubes.
5. The split boost high step-up ratio DC/DC converter as claimed in claim 2, wherein the first switching transistor T1And a second switching tube T2Or two switch tubes T in different control modes1And T2The PWM control period and the duty ratio can be different and are respectively and independently controlled.
6. The split boost high step-up ratio DC/DC converter as claimed in claim 2, wherein the first switching transistor T1And a second switching tube T2The fast full-control device of IGBT or VDMOSFET, the first diode D1And a second diode D2A high-voltage fast recovery power diode and a first capacitor C are adopted1And a second capacitor C2A capacitor with large capacity is selected, and the first inductor L can be used with or without polarity1And a second inductance L2Ferrite, amorphous alloy and the like with high suitable frequency are selected as magnetic conductionThe magnetic core of the medium is inductive, and an air gap is reserved in a magnetic circuit.
CN202110273589.2A 2021-03-12 2021-03-12 Halving boosting type high-boost ratio DC/DC converter Withdrawn CN113014089A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115514021A (en) * 2022-11-11 2022-12-23 云南电网能源投资有限责任公司 Fault regulation and control method and system for distributed photovoltaic power station and computer equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115514021A (en) * 2022-11-11 2022-12-23 云南电网能源投资有限责任公司 Fault regulation and control method and system for distributed photovoltaic power station and computer equipment

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Application publication date: 20210622