CN111431416A - Three-level LL C converter and control method thereof - Google Patents
Three-level LL C converter and control method thereof Download PDFInfo
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- CN111431416A CN111431416A CN202010308394.2A CN202010308394A CN111431416A CN 111431416 A CN111431416 A CN 111431416A CN 202010308394 A CN202010308394 A CN 202010308394A CN 111431416 A CN111431416 A CN 111431416A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 4
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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
- H02M3/22—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
- H02M3/33569—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 several active switching elements
Abstract
The invention discloses a three-level LL C converter and a control method thereof, wherein the three-level LL C converter comprises four direct current input filter capacitors, four switching devices, a clamping capacitor, two filters, two transformers, two diodes and an output voltage stabilizing capacitor, and the control method comprises an output voltage fractional order control regulation and driving signal generation link, the three-level LL C converter is small in topological switch stress and half of direct current bus voltage, small in switch loss and capable of improving system efficiency, and finally the three-level LL C converter can achieve circuit input capacitor voltage self-balancing without adding a large number of voltage sensors and complex voltage balance control algorithms.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a three-level LL C converter and a control method thereof.
Background
With the rapid development of the power electronic industry, LL C converters are widely applied, such as military power supplies, electric vehicle Charging piles, new energy power generation systems, uninterruptible power supplies, smart grids and the like, LL C converters can achieve soft switching technology, further eliminate switching loss, reduce electromagnetic interference, improve conversion efficiency of electric energy, achieve high efficiency and high power density of the system, however, voltage regulation of the conventional LL C Converter and the control method thereof has great dependence on load conditions, so that the output voltage Range of the conventional LL C Converter is limited, in order to solve the problem, Wanghao et al provides a PWM LL C Type Converter based on pulse width 865 Converter adapter applied to IEEE Transaction on Power Electronics, compared with the conventional LL C topology, the design of the PWM LL C Converter is optimized, the wide voltage Range of the load condition is achieved, the PWM LL C Converter based on PEV changing Applications is provided, compared with the conventional strategy, the three-phase voltage level Converter has a wide voltage output gain Range, the three-phase voltage level control algorithm is not required by a high-voltage balance control algorithm, and a high-voltage level control algorithm is required by a broadband voltage balance Converter equivalent to achieve a wide-voltage output voltage Range of a broadband voltage output voltage balance control algorithm equivalent to achieve a broadband voltage balance of a broadband load voltage regulator equivalent, a broadband voltage output voltage regulator equivalent, and a broadband voltage balance control algorithm with a broadband voltage equivalent to achieve a broadband voltage balance of a broadband voltage equivalent to a broadband voltage equivalent to achieve a broadband voltage equivalent to a broadband voltage equivalent load equivalent voltage equivalent to a broadband voltage equivalent load equivalent of a broadband voltage equivalent to a broadband voltage equivalent load equivalent to a broadband voltage equivalent of a broadband voltage equivalent to a.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a three-level LL C converter and a control method thereof, which have the advantages of small switching stress, small switching loss, high system efficiency and the like, can realize circuit capacitance self-balance without adding a large number of voltage sensors and complex voltage balance control algorithms, and have excellent interference resistance, steady state and dynamic performance.
The invention adopts the specific technical scheme that:
a three-level LL C converter comprises a switch unit, a transformer and an output rectifying unit, wherein the switch unit is electrically connected with the output rectifying unit by the transformer, and the switch unit is formed as the input end of the converter and is connected with a power supply VinThe output rectifying unit is formed as a converter output end VoThe switching unit includes switching devices S1, S2, S3 and S4,
the switching devices S1, S2, S3 and S4 are connected in series at the open/close sides thereof to a power supply VinBetween the positive and negative electrodes of (1);
the electric switch unit is connected with a capacitor loop in parallel, and the capacitor loop comprises a power supply VinCapacitors C1, C2, C3 and C4 which are connected in series sequentially from the positive electrode to the negative electrode;
the transformer comprises a first transformer and a second transformer;
the series connection point of the switching device S1 and the switching device S2 is connected with the primary side anode of the first transformer through an inductor L1, and the primary side cathode of the first transformer is electrically connected with the series connection point of a capacitor C1 and a capacitor C2 of the capacitor loop;
the series connection point of the switching device S3 and the switching device S4 is connected with the primary side anode of the second transformer through an inductor L2, and the primary side cathode of the second transformer is electrically connected with the series connection point of a capacitor C3 and a capacitor C4 of the capacitor loop;
the series point of the switching device S2 and the switching device S3 is formed as a point N, the series point of the capacitor C2 and the capacitor C3 is formed as a point O, and the point N is electrically connected with the point O.
The capacitors C1, C2, C3 and C4 are DC input filter capacitors,
and a clamping capacitor C5 is connected in parallel between the switching device S2 and the switching device S3.
Said outputThe rectifying unit comprises diodes D1 and D2, and the secondary anodes of the first and second transformers are respectively connected with diodes D1 and D2 in series and then electrically connected to form a transformer output end VoThe secondary sides of the first and second transformers are connected to form a transformer output end VoThe negative electrode of (1).
The output end V of the transformeroA filter capacitor C6 is connected in series between the anode and the cathode.
A control method based on a three-level LL C converter comprises the following steps
Step 1, fractional order control and regulation of output voltage:
the error of the output voltage is △ u0＝Vo *-VoWherein △ u0As an output voltage error magnitude, Vo *For output voltage reference, VoIs output voltage feedback;
the output voltage error is controlled by fractional order to adjust the transfer function of 1 to
The output voltage feedback has a transfer function of fractional order control regulation 2
(k1, k2, k3 are control variables, λ a, λ b are fractions), and the two results are subtracted to obtain the reference frequency f*；
Step 2, a driving signal generation link:
the reference frequency f obtained in the step 1*And sending the signals to a three-level PFM driving signal generating module to generate driving signals for controlling the four switching devices S1, S2, S3 and S4.
The invention has the beneficial effects that:
the three-level LL C converter and the control method thereof provided by the invention have the advantages of small switching stress, small switching loss, high system efficiency and the like, can realize circuit capacitance self-balancing without adding a large number of voltage sensors and a complex voltage balance control algorithm, have excellent interference resistance, steady state and dynamic performance, and improve the system performance of the LL C converter.
Drawings
FIG. 1 is a circuit diagram of a three-level LL C converter provided by the present invention;
fig. 2 shows an embodiment of a method for controlling a three-level LL C converter according to the present invention.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
detailed description of the preferred embodimentsthe present invention is a three-level LL C converter, comprising a switching unit electrically connected to an output rectifying unit via a transformer, the switching unit being formed as an input terminal of the converter and connected to a power supply V, as shown in fig. 1inThe output rectifying unit is formed as a converter output end VoThe switching unit includes switching devices S1, S2, S3 and S4,
the switching devices S1, S2, S3 and S4 are connected in series at the open/close sides thereof to a power supply VinBetween the positive and negative electrodes of (1);
the electric switch unit is connected with a capacitor loop in parallel, and the capacitor loop comprises a power supply VinCapacitors C1, C2, C3 and C4 which are connected in series sequentially from the positive electrode to the negative electrode;
the transformer comprises a first transformer and a second transformer;
the series connection point of the switching device S1 and the switching device S2 is connected with the primary side anode of the first transformer through an inductor L1, and the primary side cathode of the first transformer is electrically connected with the series connection point of a capacitor C1 and a capacitor C2 of the capacitor loop;
the series connection point of the switching device S3 and the switching device S4 is connected with the primary side anode of the second transformer through an inductor L2, and the primary side cathode of the second transformer is electrically connected with the series connection point of a capacitor C3 and a capacitor C4 of the capacitor loop;
the series point of the switching device S2 and the switching device S3 is electrically connected with the series point of the capacitor C2 and the capacitor C3.
And a clamping capacitor C5 is connected in parallel between the switching device S2 and the switching device S3.
The output rectifying unit comprises diodes D1 and D2, and the secondary anodes of the first and second transformers are respectively connected with diodes D1 and D2 in series and then electrically connected to form a transformer output end VoThe secondary sides of the first and second transformers are connected to form a transformer output end VoThe negative electrode of (1).
As shown in fig. 1, the transformer connected to the inductor L1 is a first transformer, and the transformer connected to the inductor L2 is a second transformer.
The output end V of the transformeroA filter capacitor C6 is connected in series between the anode and the cathode.
As shown in fig. 2, the present invention further includes a control method based on a three-level LL C converter, the control method includes
Step 1, fractional order control and regulation of output voltage:
the error of the output voltage is △ u0＝Vo *-VoWherein △ u0As an output voltage error magnitude, Vo *For output voltage reference, VoIs output voltage feedback;
the output voltage error is controlled by fractional order to adjust the transfer function of 1 to
The output voltage feedback has a transfer function of fractional order control regulation 2
(k1, k2, k3 are control variables, λ a, λ b are fractions), and the two results are subtracted to obtain the reference frequency f*；
Step 2, a driving signal generation link:
the reference frequency f obtained in the step 1*And sending the signals to a three-level PFM driving signal generating module to generate driving signals for controlling the four switching devices S1, S2, S3 and S4.
In conjunction with the three-level LL C converter topology and the control method, the three-level LL C converter topology enables three-level output,the three-level LL C converter topology has small switching stress which is half of the DC bus voltage, small switching loss and high system efficiency, does not need to increase a large number of voltage sensors, and only adopts an output voltage reference Vo *And output voltage feedback VoThe method can be used for calculation without a complex voltage balance control algorithm, has a simple system control structure, has excellent interference resistance, stable state and dynamic performance, and has an engineering application value.
Finally, the three-level LL C converter can realize circuit capacitance self-balance by mutually charging capacitors C1, C2, C3 and C4 in series, and has excellent noise immunity, steady state and dynamic performance.
Claims (5)
1. A three-level LL C converter comprises a switch unit, a transformer and an output rectifying unit, wherein the switch unit is electrically connected with the output rectifying unit by the transformer, and the switch unit is formed as the input end of the converter and is connected with a power supply VinThe output rectifying unit is formed as a converter output end VoThe switch unit comprises switch devices S1, S2, S3 and S4, and is characterized in that:
the switching devices S1, S2, S3 and S4 are connected in series at the open/close sides thereof to a power supply VinBetween the positive and negative electrodes of (1);
the electric switch unit is connected with a capacitor loop in parallel, and the capacitor loop comprises a power supply VinCapacitors C1, C2, C3 and C4 which are connected in series sequentially from the positive electrode to the negative electrode;
the transformer comprises a first transformer and a second transformer;
the series connection point of the switching device S1 and the switching device S2 is connected with the primary side anode of the first transformer through an inductor L1, and the primary side cathode of the first transformer is electrically connected with the series connection point of a capacitor C1 and a capacitor C2 of the capacitor loop;
the series connection point of the switching device S3 and the switching device S4 is connected with the primary side anode of the second transformer through an inductor L2, and the primary side cathode of the second transformer is electrically connected with the series connection point of a capacitor C3 and a capacitor C4 of the capacitor loop;
the series point of the switching device S2 and the switching device S3 is electrically connected with the series point of the capacitor C2 and the capacitor C3.
2. The three-level LL C converter according to claim 1, wherein a clamping capacitor C5 is connected in parallel between the switching device S2 and the switching device S3.
3. The tri-level LL C inverter as claimed in claim 1, wherein said output rectifying unit includes diodes D1 and D2, and the anodes of the secondary sides of said first and second transformers are respectively connected in series with diodes D1 and D2 and then electrically connected to form a transformer output terminal VoThe secondary sides of the first and second transformers are connected to form a transformer output end VoThe negative electrode of (1).
4. The three-level LL C converter as claimed in claim 3, wherein the transformer output VoA filter capacitor C6 is connected in series between the anode and the cathode.
5. A control method based on the three-level LL C converter of claim 1, wherein the control method comprises
Step 1, fractional order control and regulation of output voltage:
the error of the output voltage is △ u0＝Vo *-VoWherein △ u0As an output voltage error magnitude, Vo *For output voltage reference, VoIs output voltage feedback;
the output voltage error is controlled by fractional order to adjust the transfer function of 1 to
The output voltage feedback has a transfer function of fractional order control regulation 2
k1, k2, k3 are control variables, λ a, λ b are fractions,
subtracting the two results to obtain the reference frequency f*；
Step 2, a driving signal generation link:
the reference frequency f obtained in the step 1*And sending the signals to a three-level PFM driving signal generating module to generate driving signals for controlling the four switching devices S1, S2, S3 and S4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010308394.2A CN111431416A (en) | 2020-04-18 | 2020-04-18 | Three-level LL C converter and control method thereof |
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| CN202010308394.2A CN111431416A (en) | 2020-04-18 | 2020-04-18 | Three-level LL C converter and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4102712A1 (en) * | 2021-06-07 | 2022-12-14 | Goodrich Aerospace Services Pvt Ltd | Feedforward compensation for llc resonant converters |
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| JP2004048956A (en) * | 2002-07-15 | 2004-02-12 | Fuji Electric Holdings Co Ltd | Controlling equipment of rectifier |
| CN103887981A (en) * | 2014-03-20 | 2014-06-25 | 浙江大学 | Full-bridge DC-DC converter |
| CN106100346A (en) * | 2016-07-08 | 2016-11-09 | 北京交通大学 | A kind of have the combination type controlled resonant converter all pressing flow equalizing function |
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| US20170338761A1 (en) * | 2016-05-20 | 2017-11-23 | Ford Global Technologies, Llc | Fractional-order proportional-resonant controller |
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2020
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| JP2004048956A (en) * | 2002-07-15 | 2004-02-12 | Fuji Electric Holdings Co Ltd | Controlling equipment of rectifier |
| CN103887981A (en) * | 2014-03-20 | 2014-06-25 | 浙江大学 | Full-bridge DC-DC converter |
| US20170338761A1 (en) * | 2016-05-20 | 2017-11-23 | Ford Global Technologies, Llc | Fractional-order proportional-resonant controller |
| CN106100346A (en) * | 2016-07-08 | 2016-11-09 | 北京交通大学 | A kind of have the combination type controlled resonant converter all pressing flow equalizing function |
| CN106230264A (en) * | 2016-08-11 | 2016-12-14 | 国网天津市电力公司 | A kind of high-efficient single direction LLC resonance DC DC translation circuit topological structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4102712A1 (en) * | 2021-06-07 | 2022-12-14 | Goodrich Aerospace Services Pvt Ltd | Feedforward compensation for llc resonant converters |
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