CN115411942A - Improved method for neutral point voltage balance control of three-level bidirectional DCDC converter - Google Patents
Improved method for neutral point voltage balance control of three-level bidirectional DCDC converter Download PDFInfo
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- CN115411942A CN115411942A CN202211194349.4A CN202211194349A CN115411942A CN 115411942 A CN115411942 A CN 115411942A CN 202211194349 A CN202211194349 A CN 202211194349A CN 115411942 A CN115411942 A CN 115411942A
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- current
- bridge arm
- dcdc converter
- duty ratio
- capacitor voltage
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Abstract
The invention discloses an improved method for controlling the neutral point voltage balance of a three-level bidirectional DCDC converter, which comprises the following steps: respectively sampling the upper bridge arm support capacitor voltage, the lower bridge arm support capacitor voltage and the inductive current; selecting a switching tube for adjusting the duty ratio according to the relation between the upper bridge arm support capacitor voltage and the lower bridge arm support capacitor voltage and the direction of the inductive current, and controlling the balance of the midpoint voltage of the three-level bidirectional DCDC converter; the inductive current can also be input current or output current in a DCDC converter circuit to control the balance of the midpoint voltage of the three-level bidirectional DCDC converter; by reasonably selecting the switching tube for adjusting the duty ratio, the problem of out-of-control midpoint voltage caused by factors such as zero drift of a current detection circuit is avoided.
Description
Technical Field
The invention belongs to the field of full-automatic products, and relates to an improved method for controlling the neutral point voltage balance of a three-level bidirectional DCDC converter.
Background
For a class of three-level bidirectional DCDC circuits with upper and lower bridge arm support capacitor structures on the high-voltage side in the circuit topology, midpoint voltage balance control needs to be performed on the voltages of the upper and lower bridge arm support capacitors so as to avoid the problems of overvoltage of the support capacitor voltage, reduction of the service life and the like caused by midpoint voltage deviation. In the prior art, differential mode components are introduced to adjust the duty ratios of all switching tubes of an upper bridge arm and a lower bridge arm so as to adjust the midpoint voltage. The method has the characteristic that when the current directions are different, the duty ratio needs to be adjusted in opposite directions. Under the influence of factors such as zero drift of a current detection circuit and the like, when light load exists, the detected current direction is opposite to the actual current direction, so that the midpoint voltage is adjusted towards the wrong direction, and the midpoint voltage is out of control.
In the first prior art, differential mode components are introduced to adjust duty ratios of all switching tubes of an upper bridge arm and a lower bridge arm to adjust midpoint voltage, an adjustment direction is selected according to a current direction, and when the current directions are different, the directions of duty ratios required to be adjusted are opposite.
One disadvantage of the prior art is that when current direction judgment is wrong due to factors such as zero drift of a current detection circuit, the midpoint voltage is out of control.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following technical solutions: a method for improving the neutral-point voltage balance control of a three-level bidirectional DCDC converter comprises the following steps:
respectively sampling the upper bridge arm support capacitor voltage, the lower bridge arm support capacitor voltage and the inductive current;
and selecting a switching tube for adjusting the duty ratio according to the relation between the voltage of the upper bridge arm supporting capacitor and the voltage of the lower bridge arm supporting capacitor and the direction of the inductive current, and controlling the balance of the midpoint voltage of the three-level bidirectional DCDC converter.
Further: the specific scheme of selecting and adjusting the switching tube of the duty ratio according to the relation between the upper bridge arm support capacitor voltage and the lower bridge arm support capacitor voltage and the direction of the inductive current is as follows:
when the voltage of the upper bridge arm supporting capacitor is greater than that of the lower bridge arm supporting capacitor and the inductive current is positive, the duty ratio of the switching tube T4 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the voltage of the upper bridge arm supporting capacitor is smaller than that of the lower bridge arm supporting capacitor and the inductive current is positive, the duty ratio of the switching tube T1 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is larger than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T3 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is smaller than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T2 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged.
Further: the inductive current can also be input current or output current in a DCDC converter circuit to control the balance of the midpoint voltage of the three-level bidirectional DCDC converter.
Further: the selected switching tube can influence the current of the current inductance current direction on the current of the center point, the current of the current inductance current direction is opposite to the current direction, the current of the center point cannot be influenced, and the required duty ratio adjusting direction cannot lead to the direct connection of a bridge arm where the selected switching tube is located.
Further: the method is suitable for the situation that the detected current direction of the three-level bidirectional DCDC converter is opposite to the actual current direction.
Further, the method comprises the following steps: the method further includes filtering the inductor current.
The invention provides a neutral point voltage balance control method of a three-level bidirectional DCDC converter, which solves the problem of out-of-control neutral point voltage caused by factors such as zero drift of a current detection circuit by reasonably selecting a switching tube for adjusting the duty ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a main circuit of a three-level bidirectional DCDC converter according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the present invention will be described in detail with reference to the accompanying drawings and embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Fig. 1 is a schematic diagram of a main circuit of a three-level bidirectional DCDC converter according to an embodiment of the present invention, where the main circuit of the three-level bidirectional DCDC converter includes: the circuit comprises a voltage transformer TV1, a voltage transformer TV2, a capacitor C1, a capacitor C2, a switch tube T1, a switch tube T2, a switch tube T3, a switch tube T4, a capacitor C3 and an inductor L;
the switch tube T1, the switch tube T2, the switch tube T3 and the switch tube T4 are sequentially connected in series end to end;
one end of the inductor L is connected with the switch tube T1 and the switch tube T2;
the other end of the inductor L is connected with one end of the capacitor C3;
the other end of the capacitor C3 is connected with the switch tube T3 and the switch tube T4;
one end of the capacitor C1 is connected with one end of the switch tube T1 and one end of the voltage transformer TV 1;
the other end of the capacitor C1 is connected with one end of the switch tube T2, the other end of the voltage transformer TV1 and one end of the voltage transformer TV 2;
one end of the capacitor C2 is connected with one end of the switching tube T2, the other end of the voltage transformer TV1 and one end of the voltage transformer TV 2;
the other end of the capacitor C2 is connected with the other end of the switch tube T4 and the other end of the voltage transformer TV 2;
the following describes an improved method for controlling the midpoint voltage balance of a three-level bidirectional DCDC converter provided in an embodiment of the present invention with reference to fig. 1, including the following steps:
s101: sampling the upper bridge arm supporting capacitor voltage, the lower bridge arm supporting capacitor voltage and the inductive current of the three-level bidirectional DCDC converter:
alternatively, the inductor current may be replaced with other physical quantities such as input current, output current, etc. that can determine the direction of energy flow in the DCDC converter circuit.
S102: and selecting a switching tube for adjusting the duty ratio according to the relation between the voltage of the upper bridge arm support capacitor and the voltage of the lower bridge arm support capacitor and the direction of the inductive current.
The selection basis is as follows: the selected switching tube can influence the current of the current inductance current direction on the current of the center point, the current of the current inductance current direction is opposite to the current direction, the current of the center point cannot be influenced, and the required duty ratio adjusting direction cannot lead to the direct connection of a bridge arm where the selected switching tube is located.
Further, the method also comprises filtering the inductive current
Specifically, before adjustment, duty ratio relations of the switching tubes are that the duty ratio of the switching tube T1 is equal to the duty ratio of the switching tube T4, the duty ratios of the switching tube T1 and the switching tube T2 are complementary, and the duty ratios of the switching tube T3 and the switching tube T4 are complementary.
Inductive current I L In the forward direction as shown in figure 1,
when the upper bridge arm supporting capacitor voltage is larger than the lower bridge arm supporting capacitor voltage and the inductive current is positive, the duty ratio of the switching tube T4 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is smaller than the lower bridge arm supporting capacitor voltage and the inductive current is positive, the duty ratio of the switching tube T1 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is larger than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T3 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is smaller than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T2 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged.
As can be seen from the operation principle of the circuit shown in fig. 1, the midpoint voltage is shifted due to the accumulated charge of the midpoint current in the switching period not being zero,
when the direction of the inductor current is positive, the accumulated charge amount of the midpoint current in the switching period is related to the conduction time of the switch tube T1 and the switch tube T4,
when the inductor current direction is negative, the accumulated charge amount of the midpoint current in the switching period is related to the turn-off time of the switching tubes T2 and T3.
When the directions of the inductor currents are different, the needed adjustment directions of the duty ratios of the switching tubes are opposite. In the prior art, because each switching tube is adjusted, when the judgment of the direction of the inductive current is wrong, the midpoint voltage is adjusted towards the wrong direction. According to the method for improving the neutral point voltage balance control of the three-level bidirectional DCDC converter, provided by the embodiment of the invention, only the duty ratio of the switching tube which has an influence on the neutral point current in the current inductive current direction is selected to be adjusted, and the selected switching tube has no influence on the neutral point current when the inductive current direction is opposite, so that the neutral point voltage cannot be adjusted towards the wrong direction when the judgment of the inductive current direction is wrong.
Compared with the prior art, the method for improving the neutral point voltage balance control of the three-level bidirectional DCDC converter provided by the embodiment of the invention avoids the problem of out-of-control neutral point voltage caused by factors such as zero drift of a current detection circuit by reasonably selecting the switching tube for adjusting the duty ratio.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A three-level bidirectional DCDC converter midpoint voltage balance control improvement method is characterized in that: the method comprises the following steps:
respectively sampling the upper bridge arm support capacitor voltage, the lower bridge arm support capacitor voltage and the inductive current;
and selecting a switching tube for adjusting the duty ratio according to the relation between the upper bridge arm support capacitor voltage and the lower bridge arm support capacitor voltage and the direction of the inductive current, and controlling the balance of the midpoint voltage of the three-level bidirectional DCDC converter.
2. The improvement method for the midpoint voltage balance control of the three-level bidirectional DCDC converter according to claim 1, characterized in that: the specific scheme of selecting and adjusting the switching tube of the duty ratio according to the relation between the upper bridge arm support capacitor voltage and the lower bridge arm support capacitor voltage and the direction of the inductive current is as follows:
when the upper bridge arm supporting capacitor voltage is larger than the lower bridge arm supporting capacitor voltage and the inductive current is positive, the duty ratio of the switching tube T4 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is smaller than the lower bridge arm supporting capacitor voltage and the inductive current is positive, the duty ratio of the switching tube T1 is reduced through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is larger than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T3 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged;
when the upper bridge arm supporting capacitor voltage is smaller than the lower bridge arm supporting capacitor voltage and the inductive current is negative, the duty ratio of the switching tube T2 is increased through the duty ratio offset, and the duty ratios of other switching tubes are unchanged.
3. The improvement method for the midpoint voltage balance control of the three-level bidirectional DCDC converter according to claim 1, characterized in that: the inductive current can also be input current or output current in a DCDC converter circuit to control the balance of the midpoint voltage of the three-level bidirectional DCDC converter.
4. The improvement method for the midpoint voltage balance control of the three-level bidirectional DCDC converter according to claim 2, characterized in that: the selected switching tube can influence the current of the current inductance current direction on the current of the center point, the current of the current inductance current direction is opposite to the current direction, the current of the center point cannot be influenced, and the required duty ratio adjusting direction cannot lead to the direct connection of a bridge arm where the selected switching tube is located.
5. The improvement method for the midpoint voltage balance control of the three-level bidirectional DCDC converter according to claim 1, characterized in that: the method is suitable for the situation that the detected current direction of the three-level bidirectional DCDC converter is opposite to the actual current direction.
6. The improvement method for the midpoint voltage balance control of the three-level bidirectional DCDC converter according to claim 1, characterized in that: also included is filtering the inductor current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211194349.4A CN115411942A (en) | 2022-09-28 | 2022-09-28 | Improved method for neutral point voltage balance control of three-level bidirectional DCDC converter |
| PCT/CN2022/132734 WO2024065985A1 (en) | 2022-09-28 | 2022-11-18 | Neutral-point voltage balance control improvement method for three-level bidirectional dcdc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211194349.4A CN115411942A (en) | 2022-09-28 | 2022-09-28 | Improved method for neutral point voltage balance control of three-level bidirectional DCDC converter |
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| Publication Number | Publication Date |
|---|---|
| CN115411942A true CN115411942A (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211194349.4A Pending CN115411942A (en) | 2022-09-28 | 2022-09-28 | Improved method for neutral point voltage balance control of three-level bidirectional DCDC converter |
Country Status (2)
| Country | Link |
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| CN (1) | CN115411942A (en) |
| WO (1) | WO2024065985A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100387758B1 (en) * | 2000-09-23 | 2003-06-18 | 로크웰오토메이션코리아 주식회사 | Voltage Modulation Method |
| CN103401455B (en) * | 2013-06-26 | 2015-06-17 | 山西潞安环保能源开发股份有限公司 | Modulation method for active neutral-point clamp type tri-level inverter |
| US10396684B2 (en) * | 2014-12-16 | 2019-08-27 | Virginia Tech Intellectual Properties, Inc | Coupled inductor for interleaved multi-phase three-level DC-DC converters |
| CN109889048A (en) * | 2019-03-08 | 2019-06-14 | 钛白金科技（深圳）有限公司 | A kind of isolation bidirectional DC-DC converter |
| CN110611448B (en) * | 2019-10-25 | 2021-06-01 | 西安班特利奥能源科技有限公司 | Direct-current side voltage balance control method of three-level converter |
| CN111049381B (en) * | 2019-12-23 | 2023-05-12 | 天津大学 | Multi-target collaborative optimization control method applied to direct-current three-level converter |
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2022
- 2022-09-28 CN CN202211194349.4A patent/CN115411942A/en active Pending
- 2022-11-18 WO PCT/CN2022/132734 patent/WO2024065985A1/en unknown
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| WO2024065985A1 (en) | 2024-04-04 |
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