CN105978332A - IPOS four-level Boost converter and midpoint potential balance control thereof - Google Patents
IPOS four-level Boost converter and midpoint potential balance control thereof Download PDFInfo
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- CN105978332A CN105978332A CN201610318249.6A CN201610318249A CN105978332A CN 105978332 A CN105978332 A CN 105978332A CN 201610318249 A CN201610318249 A CN 201610318249A CN 105978332 A CN105978332 A CN 105978332A
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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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- Dc-Dc Converters (AREA)
Abstract
The invention discloses an IPOS four-level Boost converter and midpoint potential balance control thereof. The converter comprises a switching tube S1, a switching tube S2 and a switching tube S3, wherein the switching tubes S1, S2 and S3 are intersected with each other by 120 degrees for modulation. From the point of modularized series and parallel connection, the converter can be taken as three Boost converters with the parallel input and series output. A flying capacitor Cf1 and a diode D2 form a unit IV, and a flying capacitor Cf2 and a diode D4 form a unit V. The on/off states of all switching tubes and diodes of the converter are shown in the description under the 120-degree intersection modulation strategy. Based on the above device, the invention also proposes a three-ring control strategy formed through a common voltage outer ring, three current inner rings and two mean voltage rings. The mean voltage rings are put in front the current inner rings, and outputs a current instruction of the current inner rings along with the voltage outer ring. The current inner rings employ proportioning controllers.
Description
Technical field
The present invention relates to high voltage power transmission field.
Background technology
In the last few years, in order to meet the power supply occasion that input voltage is low, output voltage is high, people increasingly paid attention to input
The research of series and output-parallel (Input-Parallel-Output-Series, IPOS) combined converter.Become in IPOS combination
In parallel operation, the input of each DC/DC converter module is connected in parallel, and output is cascaded, and improves outfan electricity with this
Pressure grade.Owing to the input of modules is in parallel, thus the input current of modules only to undertake IPOS combined converter the most defeated
Entering a part for electric current, thus the current stress of modules is substantially reduced, the conversion efficiency of whole IPOS combined converter is big
Big raising.Meanwhile, IPOS combined converter also has redundancy properties, when one of them module breaks down, and only need to be by fault
The input short of module, can ensure the properly functioning of whole changer.By the end of at present, IPOS combined converter be all by every
Release DC/DC converter module combines, and the rarely seen report of combined converter being made up of non-isolation type DC/DC changer
Road.It addition, IPOS combined converter exists the unbalanced problem of output capacitance voltage, easily cause and undertake the module damage that voltage is high
Bad.Therefore, need IPOS combined converter to take certain balance control strategy to realize neutral-point potential balance.
Summary of the invention
An object of the present invention is to provide a kind of IPOS tetra-level Boost converter circuit topology.
Employed technical scheme comprise that such for realizing the object of the invention, a kind of IPOS tetra-level Boost converter, electricity
The negative pole in source is simultaneously connected with switching tube S1, switching tube S2 and the source electrode of switching tube S3.
The drain electrode of switching tube S3 connects the positive pole of diode D1, the positive pole of the negative pole connection diode D2 of diode D1, and two
The negative pole of pole pipe D2 connects the positive pole of diode D3, and the negative pole of diode D3 connects the positive pole of diode D4, and diode D4's is negative
Pole connects the positive pole of diode D5.
After the negative pole of diode D5 is sequentially connected in series electric capacity C3, electric capacity C2 and electric capacity C1, it is connected to the source electrode of switching tube S1.
The two ends of load R connect negative pole and the source electrode of switching tube S1 of diode D5 respectively.
The positive pole of power supply is divided into three tunnels: after first via series inductance L1, is connected to the drain electrode of switching tube S1.Second tunnel is successively
After series inductance L2 and electric capacity Cf1, it is connected to the negative pole of diode D2.After 3rd tunnel is sequentially connected in series inductance L3 and electric capacity Cf2, even
Receive the negative pole of diode D4.
Another object of the present invention is to provide a kind of midpoint based on above-mentioned IPOS tetra-level Boost converter circuit
Potential balance control method: include by common electric voltage outer shroud actuator, two grading ring actuators and three current inner loop regulations
The three close-loop control system that device is constituted.
The break-make of switching tube S1 and diode D1 determines Boost I dutycycle d1,
The break-make of switching tube S2 and diode D3 determines Boost II dutycycle d2,
The break-make of switching tube S3 and diode D5 determines Boost III dutycycle d3,
Gather electric capacity C1, electric capacity C2 and the split capacitor voltage U of electric capacity C3o1、Uo2、U o3, output voltage instruction Uo* with
Uo1、Uo2、Uo3Three's sum is poor, obtains common reference electric current I by outer voltage actuatorL。
Output voltage instruction Uo* 1/3rd respectively with Uo1、Uo3Differ from, missed after respective all pressures actuator
Difference reference current Δ IL1、ΔIL3。
According toRealize the solution between outer voltage and grading ring
Coupling, three the inductive current instruction I obtainedL1*、IL2*、IL3*。
IL1*、IL2*、IL3The most respectively with corresponding inductive current IL1、IL2、IL3Make comparisons, then through respective current inner loop
Actuator obtains dutycycle d of three Boost1、d2、d3:
Produce three carrier signals Ca1、Ca2And Ca3, phase 120 °, d1With Ca1Switching tube S1 is obtained after comparing
Driving signal, d2With Ca2The driving signal of switching tube S2 is obtained after comparing.d3With Ca3Switching tube is obtained after comparing
The driving signal of S3.What deserves to be explained is, further, work as d1More than Ca1Time, export high level, work as d1Less than Ca1Time, output
Low level.Work as d2More than Ca2Time, export high level, work as d2Less than Ca2Time, output low level.Work as d3More than Ca3Time, the high electricity of output
Flat, work as d3Less than Ca3Time, output low level.
Accompanying drawing explanation
Fig. 1 is IPOS tetra-level Boost converter.
Fig. 2～9 is the equivalent circuit in IPOS tetra-each stage of level Boost converter.
Figure 10 is the three close-loop control strategy of IPOS tetra-level Boost converter.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but only should not be construed the above-mentioned subject area of the present invention
It is limited to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge with used
By means, make various replacement and change, all should include within the scope of the present invention.
Embodiment 1:
See Fig. 1, a kind of IPOS tetra-level Boost converter circuit topology.The negative pole of power supply be simultaneously connected with switching tube S1,
Switching tube S2 and the source electrode of switching tube S3.The drain electrode of switching tube S3 connects the positive pole of diode D1, and the negative pole of diode D1 connects
The positive pole of diode D2, the negative pole of diode D2 connects the positive pole of diode D3, and the negative pole of diode D3 connects diode D4's
Positive pole, the negative pole of diode D4 connects the positive pole of diode D5.The negative pole of diode D5 is sequentially connected in series electric capacity C3, electric capacity C2 and electricity
After holding C1, it is connected to the source electrode of switching tube S1.The two ends of load R connect negative pole and the source of switching tube S1 of diode D5 respectively
Pole.The positive pole of power supply is divided into three tunnels: after first via series inductance L1, is connected to the drain electrode of switching tube S1.Second tunnel is sequentially connected in series
After inductance L2 and electric capacity Cf1, it is connected to the negative pole of diode D2.After 3rd tunnel is sequentially connected in series inductance L3 and electric capacity Cf2, it is connected to
The negative pole of diode D4.
What deserves to be explained is, the interlaced 120 ° of modulation of switching tube S1, S2, S3.From the series-parallel angle of modularity, can
Regard IPOS tetra-level Boost converter as three Boost input-series and output-parallels.Wherein, first Boost by
L1, S1, D1, C1 form, and are designated as Boost I.Second Boost is made up of L2, S2, D3, C2, is designated as Boost II.
3rd Boost is made up of L2, S2, D5, C3, is designated as Boost III.Striding capacitance Cf1 and diode D2 constitutes single
Unit IV, striding capacitance Cf2 and diode D4 Component units V.Unit IV is as the temporary location of Boost I Yu Boost II, real
Show the input-series and output-parallel of the two Boost module.Unit V is as in Boost II and Boost III
Between unit, it is achieved that the input-series and output-parallel of the two Boost module.Accordingly, because unit IV and unit V
Exist so that Boost I, Boost II and tri-module input-series and output-parallels of Boost III, improve whole changer
Boost capability.
Under staggered 120 ° of modulation strategies, each switching tube of IPOS tetra-level Boost converter and the switch of diode
State is as shown in table 1, and equivalent circuit is as shown in Figure 2.According to the difference of dutycycle d, by the work of IPOS tetra-level Boost converter
It is divided into three kinds of situations as state:
1., when 0≤d≤1/3, IPOS tetra-level Boost converter works in stage I, II, III, IV.
2., when 1/3≤d≤2/3, IPOS tetra-level Boost converter works in stage I, II, III, V, VI, VII.
3., when 2/3≤d≤1, IPOS tetra-level Boost converter works in stage V, VI, VII, VIII.
In IPOS tetra-level Boost converter, output voltage and capacitance voltage size are respectively as follows:
Striding capacitance Cf1Voltage stress and striding capacitance Cf2Voltage stress size be:
Switching tube is identical with the voltage stress size of diode, for:
Input current ripple size is:
Table 1 on off state
Embodiment 2
Control to realize the rigorous equilibrium of midpoint potential, the open a kind of three close-loop control strategy of this patent.More specifically,
Include the three close-loop control system that common electric voltage outer shroud actuator, two grading ring actuators and three current inner loop actuators are constituted
System.The break-make of switching tube S1 and diode D1 determines Boost I dutycycle d1, the break-make of switching tube S2 and diode D3 determines
Boost II dutycycle d2, the break-make of switching tube S3 and diode D5 determines Boost III dutycycle d3。
Gather electric capacity C1, electric capacity C2 and the split capacitor voltage U of electric capacity C3o1、Uo2、U o3, output voltage instruction Uo* with
Uo1、Uo2、Uo3Three's sum is poor, obtains common reference electric current I by outer voltage actuatorL。
Output voltage instruction Uo* 1/3rd respectively with Uo1、Uo3Differ from, missed after respective all pressures actuator
Difference reference current Δ IL1、ΔIL3。
According toRealize the decoupling between outer voltage and grading ring,
Three the inductive current instruction I obtainedL1*、IL2*、IL3*。
IL1*、IL2*、IL3The most respectively with corresponding inductive current IL1、IL2、IL3Differ from, then adjust through respective current inner loop
Joint device obtains dutycycle d of three Boost1、d2、d 3。
The derivation of above-mentioned control method is as follows:
In IPOS tetra-level Boost converter, the magnitude relationship between input inductive current and output electric current is:
Wherein, dutycycle d1、d2、d3All it is made up of two parts, is represented by:
Wherein, d is public dutycycle, Δ d1、Δd2、Δd3Represent Boost I, Boost II, Boost III respectively
All press dutycycle.By the expression formula that (8) and (9) substitution (7) can obtain three Boost module output current variable quantities it is:
In the case of output voltage is not disturbed, Δ IoSize is 0, thus (10) can be reduced to:
When IPOS tetra-level Boost converter enters steady-working state, public dutycycle d of three switching tubes and public affairs
Common-battery inducing current ILConstant magnitude.Variation delta I thereby through inductive currentL1、ΔIL2、ΔIL3Can indirectly reflect Δ d1、
Δd2、Δd3Size.Three equatioies in (11) are added:
In three close-loop control strategy, there is the output meeting of intercouple relation, i.e. outer voltage with grading ring in outer voltage
The balance affecting midpoint potential controls, and the output of grading ring can affect the burning voltage output of this changer.In order to realize
Uneoupled control between outer voltage and grading ring, it is necessary to make Δ d1、Δd2、Δd3Sum is equal to 0, so that three electricity
Variation delta I of inducing currentL1、ΔIL2、ΔIL3Sum is equal to 0, it may be assumed that
ΔIL1+ΔIL2+ΔIL3=0 (13)
(13) deformation can be obtained:
ΔIL2=-Δ IL1-ΔIL3 (14)
The reference current that can obtain three Boost modules based on (14) is respectively as follows:
The decoupling between outer voltage and grading ring is realized, three the inductive current instruction I obtained according to (15)L1*、
IL2*、IL3*, respectively with corresponding inductive current IL1、IL2、IL3Make comparisons, then obtain three through respective current inner loop actuator
The dutycycle of individual Boost, it may be assumed that
In conjunction with (15) and (16), this patent proposes three close-loop control strategy as shown in Figure 10, by a common electric voltage outside
Ring, three current inner loop and two grading rings are constituted.Grading ring is put into before current inner loop, exports together with outer voltage
The current-order of current inner loop, current inner loop adoption rate controller.
According to the three close-loop control strategy shown in 10, the neutral-point-potential balance control principle of IPOS tetra-level Boost converter
For: work as Uo1More than 1/3Uo* Uo3Less than 1/3Uo* time, Δ IL1For bearing and Δ IL3For just, thus IL1 *Reduce and IL3 *Increase, make
Obtain d1Reduce and d3Increase, thus Uo1Reduce and Uo3Increase, define a negative feedback.If it addition, Δ IL1Absolute value be more than
ΔIL3, then IL2 *Increase so that d2Increase.After several switch periods, it is achieved Uo1、Uo2、Uo3Equilibrium, i.e. midpoint potential are put down
Weighing apparatus.In like manner, under other different conditions, it is also possible to realize Uo1、Uo2、Uo3Electric voltage equalization.
Claims (2)
1. IPOS tetra-level Boost converter, it is characterised in that:
The negative pole of power supply is simultaneously connected with switching tube S1, switching tube S2 and the source electrode of switching tube S3；
The drain electrode of switching tube S3 connects the positive pole of diode D1, and the negative pole of diode D1 connects the positive pole of diode D2, diode
The negative pole of D2 connects the positive pole of diode D3, and the negative pole of diode D3 connects the positive pole of diode D4, and the negative pole of diode D4 is even
Connect the positive pole of diode D5；
After the negative pole of diode D5 is sequentially connected in series electric capacity C3, electric capacity C2 and electric capacity C1, it is connected to the source electrode of switching tube S1；
The two ends of load R connect negative pole and the source electrode of switching tube S1 of diode D5 respectively；
The positive pole of power supply is divided into three tunnels: after first via series inductance L1, is connected to the drain electrode of switching tube S1；Second tunnel is sequentially connected in series
After inductance L2 and electric capacity Cf1, it is connected to the negative pole of diode D2；After 3rd tunnel is sequentially connected in series inductance L3 and electric capacity Cf2, it is connected to
The negative pole of diode D4.
2. a neutral-point potential balance control method based on changer described in claim 1, it is characterised in that:
Including the three ring controls being made up of common electric voltage outer shroud actuator, two grading ring actuators and three current inner loop actuators
System processed；
The break-make of switching tube S1 and diode D1 determines Boost I dutycycle d1,
The break-make of switching tube S2 and diode D3 determines Boost II dutycycle d2,
The break-make of switching tube S3 and diode D5 determines Boost III dutycycle d3,
Gather electric capacity C1, electric capacity C2 and the split capacitor voltage U of electric capacity C3o1、Uo2、Uo3, output voltage instruction Uo* with Uo1、Uo2、
Uo3Three's sum is poor, obtains common reference electric current I by outer voltage actuatorL；
Output voltage instruction Uo* 1/3rd respectively with Uo1、Uo3Differ from, after respective all pressures actuator, all pressed ginseng
Examine electric current Δ IL1、ΔIL3；
According toRealize the decoupling between outer voltage and grading ring, obtain
Three inductive currents instruction IL1*、IL2*、IL3*；
IL1*、IL2*、IL3The most respectively with corresponding inductive current IL1、IL2、IL3Differ from, then through respective current inner loop actuator
Obtain dutycycle d of three Boost1、d2、d3:
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549577A (en) * | 2016-12-08 | 2017-03-29 | 北京理工大学 | The two-way high-gain DC/DC changer of non-isolated and method for controlling frequency conversion |
| CN107257206A (en) * | 2017-05-15 | 2017-10-17 | 上海交通大学 | A kind of three end commutator transformers |
| CN107579660A (en) * | 2017-09-19 | 2018-01-12 | 南方电网科学研究院有限责任公司 | The output control method and device of DC converter |
| CN109617408A (en) * | 2018-12-24 | 2019-04-12 | 北京交通大学 | Based on the capacitor-clamped super high-gain boost converter of three-phase crisscross parallel |
| CN110045170A (en) * | 2019-04-01 | 2019-07-23 | 漳州科华技术有限责任公司 | A kind of inductive current detection method, system and the device of lifting/voltage reducing circuit |
| CN110838792A (en) * | 2019-11-08 | 2020-02-25 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN111342688A (en) * | 2019-12-20 | 2020-06-26 | 樊蓉 | Four-level converter voltage balance modulation method |
| CN113691132A (en) * | 2021-08-20 | 2021-11-23 | 电子科技大学 | Voltage balancing three-state dual-output boost converter and control method thereof |
| WO2022088404A1 (en) * | 2020-11-02 | 2022-05-05 | 合肥科威尔电源系统股份有限公司 | Voltage equalizing control circuit and control method therefor |
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| CN107257206A (en) * | 2017-05-15 | 2017-10-17 | 上海交通大学 | A kind of three end commutator transformers |
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| CN110045170A (en) * | 2019-04-01 | 2019-07-23 | 漳州科华技术有限责任公司 | A kind of inductive current detection method, system and the device of lifting/voltage reducing circuit |
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| CN110838792A (en) * | 2019-11-08 | 2020-02-25 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN110838792B (en) * | 2019-11-08 | 2020-09-04 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN111342688A (en) * | 2019-12-20 | 2020-06-26 | 樊蓉 | Four-level converter voltage balance modulation method |
| WO2022088404A1 (en) * | 2020-11-02 | 2022-05-05 | 合肥科威尔电源系统股份有限公司 | Voltage equalizing control circuit and control method therefor |
| CN113691132A (en) * | 2021-08-20 | 2021-11-23 | 电子科技大学 | Voltage balancing three-state dual-output boost converter and control method thereof |
| CN113691132B (en) * | 2021-08-20 | 2023-03-14 | 电子科技大学 | Voltage balance three-state double-output boost converter and control method thereof |
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| CN105978332B (en) | 2019-04-16 |
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