CN114884352B - Partial power converter with buck-boost function and control method thereof - Google Patents
Partial power converter with buck-boost function and control method thereof Download PDFInfo
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- CN114884352B CN114884352B CN202210494989.0A CN202210494989A CN114884352B CN 114884352 B CN114884352 B CN 114884352B CN 202210494989 A CN202210494989 A CN 202210494989A CN 114884352 B CN114884352 B CN 114884352B
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- 230000009365 direct transmission Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 10
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- 230000005284 excitation Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 1
- 230000006870 function Effects 0.000 description 13
- 238000004590 computer program Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a two-stage DC-DC structure with partial power converters with a buck-boost function connected together in a cascade mode, wherein a front-stage converter is an isolated DC-DC converter, and a rear-stage converter is a voltage double-quadrant DC-DC converter. The partial power converter has an efficient buck-boost function. The invention also discloses a control method of the partial power converter with the buck-boost function, and the buck-boost function is realized through the post-stage converter; when boosting, the output voltage of the rear-stage converter is positive, and the total output voltage is the input voltage of the front-stage converter plus the output voltage of the rear-stage converter; when the voltage is reduced, the output voltage of the rear-stage converter is negative, and the total output voltage is the absolute value of the front-stage input voltage minus the rear-stage output voltage; the ratio of the transmission power of the partial power converter to the direct transmission power is the ratio of the output voltage of the rear-stage converter to the input voltage of the front-stage converter, and the power distribution can be realized by adjusting the output voltage of the rear-stage converter.
Description
Technical Field
The invention relates to the technical field of direct current power converters, in particular to a high-efficiency partial power converter with a voltage increasing and decreasing function and a control method thereof.
Background
With the continuous progress of global technology and continuous upgrade of industry, power supply equipment has become the heart of various industrial equipment, power supply systems have also changed greatly, and traditional power supplies cannot meet higher demands.
With the gradual increase of high-power demands, how to realize high-power transmission by using power electronic devices is becoming important. High output voltage class, high power density, high reliability are the targets pursued by current high voltage dc power supplies. The power supply scheme adopted by the traditional high-voltage direct-current power supply is that the input end is connected with alternating-current commercial power, the alternating-current commercial power is boosted into high-voltage alternating current through a boosting transformer, and then high-voltage output is obtained through rectification.
With the development of power electronics, the hvth power supply has undergone a development process from low frequency to high frequency, low power to high power, low performance to high performance. The switching device is used for chopping the input direct current, and the transformer is used for boosting and rectifying the high-frequency pulse into high-voltage direct current. Therefore, the switch-type high-voltage direct-current power supply gradually replaces the traditional power supply to be applied to various industries, such as the medical field, the agricultural field, the industrial field, the military field and the scientific research.
The Chinese patent with the patent number of CN114123195A discloses an active power electronic device and a method for reducing the loss of a transformer and a circuit, wherein the device comprises an alternating current-direct current converter and a battery, the input end of the direct current converter is connected with the load side of the transformer, the output end of the direct current converter is connected with a storage battery, a direct current breaker is arranged between the output end of the direct current converter and the storage battery, and the alternating current-direct current converter is in a T-shaped three-level topology or a two-level topology formed by power type power electronic switches. The battery is connected to the output end of the converter, and when the load is changed, the battery can be used for adjusting, for example: when intermittent load is added into the system, the intermittent load is effectively applied through the discharge energy of the battery, so that the overload capacity of the transformer is reduced, and the power supply reliability is improved. All power is directly transmitted through the power electronic device, and the defects of high device loss and low efficiency exist, so that part of power converters are introduced to perform power transmission in order to further improve the transmission efficiency.
Chinese patent No. CN114123195A discloses a two-stage DC-DC converter with partial power regulation function, comprising: inputting a power supply; a primary conversion unit; an intermediate capacitance unit; a resonance conversion unit; an output rectifying unit; and a load unit. The input power supply is connected with the ACF conversion unit, the intermediate capacitance unit is connected with the input power supply, the ACF conversion unit and the output rectification unit, and the load unit is connected to the output end of the output rectification unit. The invention solves the problem of low efficiency of the traditional two-stage DC-DC converter, has high efficiency and high power density, and can meet different output voltage requirements. However, the current partial power converter still has the defects of small voltage adjustable range, insufficient small-power prying high-power capability and the like.
Therefore, there is a need for a new type of partial power converter with buck-boost capability that is efficient.
Disclosure of Invention
The invention provides a high-efficiency partial power converter with a buck-boost function.
A part of power converters with a buck-boost function are of a two-stage DC-DC structure which are connected together in a cascading mode, wherein a front-stage converter is an isolated DC-DC converter, and a rear-stage converter is a voltage double-quadrant DC-DC converter.
The input voltage anode of the front-stage converter is connected with the output voltage cathode of the rear-stage converter, the voltage boosting and reducing function is realized through voltage conversion of the rear-stage converter, and the power distribution is realized through regulating the output voltage of the rear-stage converter.
Most of the power can be directly transmitted through the transmission line, so that the overall efficiency of the partial power converter is greatly improved, and the aims of low power prying high power and high efficiency are fulfilled.
The isolated DC-DC converter is formed by combining two LLC-DCX converters in a mode of input series connection and output parallel connection. The power transmission of high voltage and large current can be realized.
The LLC-DCX converter comprises a primary side switch circuit, a resonant circuit, an isolation transformer, a secondary side rectifying circuit and an output filter capacitor.
The resonant circuit comprises a resonant inductor, a resonant capacitor and a transformer excitation inductor.
The voltage double-quadrant DC-DC converter is a three-phase staggered parallel Buck converter. Voltage double-limit adjustment can be realized.
The three-phase staggered parallel Buck converter is a three-phase parallel Buck circuit, wherein three output capacitors are combined into the positive electrode of the three-phase Buck output end of one output capacitor to serve as the positive electrode of a load, the negative electrode of the output end is connected with the positive electrode of the input end of the preceding-stage converter, and the negative electrode of the load is connected with the negative electrode of the input end of the preceding-stage converter.
The invention also provides a control method of the partial power converter with the buck-boost function, which comprises the following steps:
The voltage rise and fall is realized through a later-stage converter; when boosting, the output voltage of the rear-stage converter is positive, and the total output voltage is the input voltage of the front-stage converter plus the output voltage of the rear-stage converter; during voltage reduction, the output voltage of the later-stage converter is negative, and the total output voltage is the absolute value of the input voltage of the earlier stage minus the output voltage of the later stage.
The ratio of the transmission power of the partial power converter to the direct transmission power is the ratio of the output voltage of the rear-stage converter to the input voltage of the front-stage converter, and the power distribution can be realized by adjusting the output voltage of the rear-stage converter.
Compared with the prior art, the invention has the beneficial effects that:
The invention realizes the voltage increasing and decreasing function through the voltage transformation of the rear-stage converter, and simultaneously can realize the power distribution by adjusting the output voltage of the rear-stage, and most of the power can be directly transmitted through the transmission line, so that the whole efficiency of part of the power converter is greatly improved, and the aims of small power prying high power and high efficiency are fulfilled.
Drawings
Fig. 1 is a schematic diagram of a topology of a portion of a power converter according to an embodiment.
Fig. 2 is a topology of a converter provided in an embodiment.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention is further illustrated by the following examples:
As shown in fig. 1, the partial power converter is configured by connecting two stages of DC-DC in cascade, wherein the front stage is generally an isolated DC-DC converter, and the rear stage is a voltage double-quadrant DC-DC converter. The total output voltage V out is equal to the input voltage V in of the front stage plus the output voltage of the converter, the positive electrode of the input voltage of the front stage is connected with the negative electrode of the output voltage of the rear stage, the voltage-increasing and decreasing functions are realized through voltage conversion of the converter of the rear stage, meanwhile, the power distribution can be realized through adjusting the output voltage of the rear stage, and most of power can be directly transmitted through a transmission line, so that the overall efficiency of part of the power converter is greatly improved, and the aims of high power and high efficiency of low power prying are fulfilled.
Taking the topology shown in fig. 2 as an example, the structure of a part of power converters comprises front-stage converters and rear-stage converters which are connected together in a cascade mode, the front-stage converters are formed by combining two LLC-DCX converters in a mode of input series connection and output parallel connection, and can realize power transmission of high voltage and high current, and the specific structure of one LLC-DCX converter is as follows:
The LLC-DCX converter comprises a primary side switch circuit, a resonant circuit, an isolation transformer, a secondary side rectifying circuit and an output filter capacitor. The resonant circuit includes a resonant inductance L k, a resonant capacitance C 3, and a transformer excitation inductance L m. The primary side switching circuit comprises four switching tubes Q 1、Q2、Q3 and Q 4, the drains of the switching tubes Q 1 and Q 3 are connected with an input positive electrode, the sources of the switching tubes Q 2 and Q 4 are connected with an input negative electrode, the source of the switching tube Q 1 is connected with the drain of the switching tube Q 2, the primary side switching circuit is connected with one end of a transformer excitation inductor, and the source of the switching tube Q 3 is connected with the drain of the switching tube Q 4 and is connected with the other end of the transformer excitation inductor. The secondary side rectifying circuit comprises four rectifying diodes D 1、D2、D3 and D 4, wherein the cathode of the diode D 1、D3 is connected with the output positive stage and is connected with one end of the rear-stage converter, and the cathode of the diode D 2 and the cathode of the diode D 4 are connected with the other end of the rear-stage converter.
The back stage is a three-phase staggered parallel Buck converter, and voltage double-phase limit adjustment can be realized.
The voltage regulating range is determined by the three-phase staggered parallel Buck converter at the rear stage, when voltage regulation in a larger range is needed, the absolute value of the output voltage of the Buck converter can be increased, and the output voltage can be freely regulated in a wider range after the input voltage is superimposed.
The three-phase staggered parallel Buck converter is a three-phase staggered parallel Buck circuit, wherein three output capacitors are combined into one output capacitor, the positive electrode of the three-phase Buck output end is used as the positive electrode of a load, the negative electrode of the output end is connected with the positive electrode of the input end of the preceding-stage converter, and the negative electrode of the load is connected with the negative electrode of the input end of the preceding-stage converter.
If the overall efficiency of the converter is to be improved, the output voltage of the Buck converter can be reduced to reduce the transmission power of the converter, and then a larger proportion of power is directly transmitted from the input side to the output side through the transmission line.
The invention is beneficial to improving the efficiency of part of power converters and providing a wider output voltage range, and has larger engineering application value and popularization prospect.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The partial power converter with the buck-boost function is characterized by being of a two-stage DC-DC structure connected in a cascading mode, wherein the front-stage converter is an isolated DC-DC converter, and the rear-stage converter is a voltage double-quadrant DC-DC converter;
the input voltage anode of the front-stage converter is connected with the output voltage cathode of the rear-stage converter, the voltage rising and falling function is realized through voltage conversion of the rear-stage converter, and the power distribution is realized through regulating the output voltage of the rear-stage converter;
the isolated DC-DC converter is formed by combining two LLC-DCX converters in a mode of input series connection and output parallel connection.
2. The partial power converter with buck-boost function according to claim 1, wherein the LLC-DCX converter includes a primary side switching circuit, a resonant circuit, an isolation transformer, a secondary side rectifying circuit, and an output filter capacitor.
3. The partial power converter with buck-boost function according to claim 2, wherein the resonant circuit includes a resonant inductance, a resonant capacitance, and a transformer excitation inductance.
4. The partial power converter with Buck-boost function according to claim 1, wherein the voltage double-quadrant DC-DC converter is a three-phase interleaved parallel Buck converter.
5. The partial power converter with Buck-boost function according to claim 4, wherein the three-phase interleaved Buck converter is three parallel Buck circuits, wherein the three output capacitors are combined into one output capacitor, the positive pole of the three-phase Buck output terminal is used as the positive pole of the load, the negative pole of the output terminal is connected with the positive pole of the input terminal of the preceding stage converter, and the negative pole of the load is connected with the negative pole of the input terminal of the preceding stage converter.
6. The control method of a partial power converter with a step-up/step-down function according to any one of claims 1 to 5, comprising:
the voltage rise and fall is realized through a later-stage converter; when boosting, the output voltage of the rear-stage converter is positive, and the total output voltage is the input voltage of the front-stage converter plus the output voltage of the rear-stage converter; when the voltage is reduced, the output voltage of the rear-stage converter is negative, and the total output voltage is the absolute value of the front-stage input voltage minus the rear-stage output voltage;
The ratio of the transmission power of the partial power converter to the direct transmission power is the ratio of the output voltage of the rear-stage converter to the input voltage of the front-stage converter, and the power distribution can be realized by adjusting the output voltage of the rear-stage converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210494989.0A CN114884352B (en) | 2022-05-07 | 2022-05-07 | Partial power converter with buck-boost function and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210494989.0A CN114884352B (en) | 2022-05-07 | 2022-05-07 | Partial power converter with buck-boost function and control method thereof |
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| CN114884352A CN114884352A (en) | 2022-08-09 |
| CN114884352B true CN114884352B (en) | 2024-06-11 |
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| CN114884352A (en) | 2022-08-09 |
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