CN110138223A - A kind of two-way DC/DC converter and its control method - Google Patents
A kind of two-way DC/DC converter and its control method Download PDFInfo
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- CN110138223A CN110138223A CN201910394965.6A CN201910394965A CN110138223A CN 110138223 A CN110138223 A CN 110138223A CN 201910394965 A CN201910394965 A CN 201910394965A CN 110138223 A CN110138223 A CN 110138223A
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
-
- 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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
-
- 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
Abstract
The invention discloses a kind of two-way DC/DC converter and its control method, which includes: the front stage converter and rear class converter of crisscross parallel, and front stage converter is that staggeredly fixed frequency is run, and rear class converter is staggeredly voltage and current double closed-loop operation.This method comprises: in forwards/reverse operation, it controls rear class converter and passes through outer voltage output current-order, then the inductive current that will test is compared with the current-order, and the duty ratio for adjusting multiple converters in the rear class converter comes so that the electric current of multiple converters is identical；So that the input/output voltage of multiple converters is different in prime variator.Two-way DC/DC converter of the invention and its control method, the problem of LLC converter soft switch can not only being played, the low and small strong point of interleaved parallel converter output current ripple is lost, while can be avoided bring current unevenness inconsistent because of parameter when LLC converter parallel connection.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of two-way DC/DC converter and its control method.
Background technique
LLC resonant converter is a kind of resonance that output voltage or constant output current are realized by control switch frequency
Circuit, its advantages are that the switching loss of switching tube can be effectively reduced by soft switch technique, improve converter efficiency and
Power density.But LLC resonant converter exports no inductor filter, causes current ripples big, influences the capacitor service life, so
Large-power occasions, LLC need to use using crisscross parallel.
Duty ratio can be adjusted with traditional pwm converter and flows difference, and LLC converter can not be equal by adjusting frequency
Stream, otherwise the frequency of each phase LLC converter is different, loses the effect that paralleling and interleaving reduces current ripples.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, proposes a kind of two-way DC/DC converter and its controlling party
Method, using the cascade of two-stage DC/DC converter, paralleling and interleaving structure, can not only play the loss of LLC converter soft switch it is low and
The small strong point of interleaved parallel converter output current ripple, while can be avoided inconsistent because of parameter when LLC converter parallel connection
The problem of bring current unevenness.
In order to solve the above technical problems, the present invention is achieved through the following technical solutions:
The present invention provides a kind of two-way DC/DC converter comprising: front stage converter and rear class converter, before described
Grade converter and the rear class converter are Interleaving and Transformer Paralleling；Wherein,
The front stage converter is that staggeredly fixed frequency is run, and the rear class converter is staggeredly voltage and current double closed-loop operation；
In forward direction operation, the rear class converter is used to then will test by outer voltage output current-order
Inductive current compared with the current-order, made by adjusting the duty ratio of multiple converters in the rear class converter
The electric current for obtaining multiple converters is identical；So that the output voltage of multiple converters is different in the prime variator；
In inverted running, the rear class converter is used to then will test by outer voltage output current-order
Inductive current compared with the current-order, made by adjusting the duty ratio of multiple converters in the rear class converter
The electric current for obtaining multiple converters is identical；So that the input voltage of multiple converters is different in the prime variator.
Preferably, the front stage converter is LLC converter；
The rear class converter is Buck/Boost converter.
The present invention also provides a kind of control methods of two-way DC/DC converter comprising:
S11: in forward direction operation, then control rear class converter will test by outer voltage output current-order
Inductive current compared with the current-order, the duty ratio for adjusting multiple converters in the rear class converter is come so that more
The electric current of a converter is identical；So that the output voltage of multiple converters is different in prime variator；
S12: in inverted running, then control rear class converter will test by outer voltage output current-order
Inductive current compared with the current-order, the duty ratio for adjusting multiple converters in the rear class converter is come so that more
The electric current of a converter is identical；So that the input voltage of multiple converters is different in prime variator；
The process S11 and process S12 sequence in no particular order.
Compared to the prior art, the invention has the following advantages that
(1) two-way DC/DC converter of the invention and its control method can play LLC by using LLC converter
Low strong point is lost in the Sofe Switch of converter；Additionally by the Interleaving and Transformer Paralleling for using front stage converter Yu rear class converter,
The strong point of the output electric current Wen Bo little of interleaved parallel converter can be played；And it is adjusted by using Buck/Boost converter
Because of the inconsistent bring current unevenness of parameter when saving output or the input voltage of LLC converter, and then avoiding LLC converter parallel connection
The problem of；
(2) two-way DC/DC converter of the invention and its control method are become by the structure of multiple transformer parallel running
The power of parallel operation is changed into the summation of all inverter powers by the power of single inverter, and then can effectively expand converter
Power.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
Embodiments of the present invention are described further with reference to the accompanying drawing:
Fig. 1 is the topological diagram of the DC/DC converter of one embodiment of the invention；
Fig. 2 is the topological diagram of traditional DC/DC converter；
Fig. 3 is the control schematic diagram of the DC/DC converter of one embodiment of the invention；
Fig. 4 is the electric current principle figure of DC/DC converter；
Fig. 5 is the current unevenness waveform diagram of traditional DC/DC converter；
Fig. 6 is the current balance waveform diagram of the DC/DC converter of one embodiment of the invention.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Fig. 1 is the topological diagram of the DC/DC converter of one embodiment of the invention.
With reference to Fig. 1, the DC/DC converter of the present embodiment includes: front stage converter and rear class converter, front stage converter
It is Interleaving and Transformer Paralleling with rear class converter.Wherein, staggeredly fixed frequency is run front stage converter, and rear class converter interlocks voltage and current
Two close cycles operation, control schematic diagram will be as shown in figure 3, rear class converter for passing through outer voltage output current-order, then will
The inductive current detected compared with current-order, by adjust rear class converter in multiple converters duty ratio come so that
The electric current of multiple converters is identical；So that the output voltage of multiple converters or input voltage are different in prime variator.
In the present embodiment, front stage converter is LLC converter, and uses two LLC converters, respectively LLC1, LLC2；Rear class transformation
Device is Buck/Boost converter, and uses two Buck/Boost converters, respectively Buck/Boost1, Buck/
Boost2。
Traditional LLC resonant converter when inconsistent due to its each phase resonance parameter, leads to its gain in forward direction operation
Curve generates deviation, and because LLC resonant converter needs parallel running to reduce ripple current, each phase LLC working frequency
Must it is identical, will lead in this way the resonance frequency LLC less than normal LLC big relative to resonance frequency its output gain it is smaller.It passes
LLC resonant converter in parallel of uniting is as shown in Figure 2.When conventional transducers operation, it is assumed that LLC1 resonant parameter is larger, then LLC1
Ratio of gains LLC2 gain is small under identical frequency, such as in Fig. 4 shown in rectangular and Diamond spot.When parallel running, LLC1 and LLC2
Input voltage and output voltage it is all the same, so its gain must it is identical, i.e. LLC1 must reduce resonance current to make itself
Gain increases to identical as LLC2, such as in Fig. 4 shown in dotted line, is illustrated in figure 5 current unevenness waveform diagram.
Traditional LLC resonant converter when inconsistent due to its each phase resonance parameter, leads to its gain in inverted running
Curve generates deviation, and because LLC resonant converter needs parallel running to reduce ripple current, each phase LLC working frequency
Must it is identical, will lead in this way the resonance frequency LLC less than normal LLC big relative to resonance frequency its output gain it is smaller.It passes
LLC resonant converter in parallel of uniting is as shown in Figure 2.When conventional transducers operation, it is assumed that LLC1 resonant parameter is larger, then LLC1
Ratio of gains LLC2 gain is small under identical frequency, such as in Fig. 4 shown in rectangular and Diamond spot.When parallel running, LLC1 and LLC2
Input voltage and output voltage it is all the same, so its gain must it is identical, i.e. LLC1 must reduce resonance current to make itself
Gain increases to identical as LLC2, such as in Fig. 4 shown in dotted line, is illustrated in figure 5 current unevenness waveform diagram.
The converter of the present embodiment is in forward direction operation, although its each phase resonance parameter is inconsistent, causes its gain bent
Line generates deviation, must be identical in each phase LLC working frequency, will lead to resonance frequency LLC less than normal in this way relative to resonance frequency
The gain of its output of the big LLC of rate is smaller.Assuming that LLC1 resonant parameter is larger, then LLC1 ratio of gains LLC2 under identical frequency increases
Benefit is small, such as in Fig. 4 shown in rectangular and Diamond spot.When parallel running, this converter passes through Buck/Boost converter first
Outer voltage output current-order, the inductive current that then will test is compared with current-order, by adjusting Buck/Boost
Duty ratio make the electric current of two Buck/Boost identical.The output voltage of LLC1 and LLC2 is no longer identical at this time, i.e. LLC1
The gain needed with LLC2 is no longer identical, and LLC1 and LLC2 are run in diamond shape and rectangular place respectively, and resonance current is equalized, electricity
It is as shown in Figure 6 to flow equalized waveform figure.
The converter of the present embodiment is in inverted running, although its each phase resonance parameter is inconsistent, causes its gain bent
Line generates deviation, must be identical in each phase LLC working frequency, will lead to resonance frequency LLC less than normal in this way relative to resonance frequency
The gain of its output of the big LLC of rate is smaller.Assuming that LLC1 resonant parameter is larger, then LLC1 ratio of gains LLC2 under identical frequency increases
Benefit is small, such as in Fig. 4 shown in rectangular and Diamond spot.When parallel running, this converter passes through Buck/Boost variator first
Outer voltage output current-order, the inductive current that then will test is compared with current-order, by adjusting Buck/Boost
Duty ratio make the electric current of two Buck/Boost identical.The input voltage of LLC1 and LLC2 is no longer identical at this time, i.e. LLC1
The gain needed with LLC2 is no longer identical, and LLC1 and LLC2 are run in diamond shape and rectangular place respectively, and resonance current is equalized, electricity
It is as shown in Figure 6 to flow equalized waveform figure.
In another embodiment, a kind of control method of DC/DC converter applied to above-described embodiment is also provided, is wrapped
Include following below scheme:
S11: in forward direction operation, then control rear class converter will test by outer voltage output current-order
Inductive current compared with current-order, adjust the duty ratio of two converters in rear class converter and come so that two converters
Electric current it is identical；So that the output voltage of two converters is different in prime variator；
S12: in inverted running, then control rear class converter will test by outer voltage output current-order
Inductive current compared with the current-order, adjust the duty ratio of two converters in rear class converter and come so that multiple changes
The electric current of parallel operation is identical；So that the input voltage of two converters is different in prime variator；
Above-mentioned process S11 and process S12 sequence in no particular order.
It should be noted that LLC converter and Buck/Boost variator are all to include two in above-described embodiment
For be illustrated, in different embodiments, LLC converter may also comprise more than two LLC converters, and Buck/Boost becomes
Changing device may also comprise more than two Buck/Boost variators, and those skilled in the art can select according to actual needs,
And its specific topological diagram can be associated, details are not described herein again.
Disclosed herein is merely a preferred embodiment of the present invention, these embodiments are chosen and specifically described to this specification, is
Principle and practical application in order to better explain the present invention is not limitation of the invention.Anyone skilled in the art
The modifications and variations done within the scope of specification should all be fallen in the range of of the invention protect.
Claims (6)
1. a kind of two-way DC/DC converter characterized by comprising front stage converter and rear class converter, the prime become
Parallel operation and the rear class converter are Interleaving and Transformer Paralleling；Wherein,
The front stage converter is that staggeredly fixed frequency is run, and the rear class converter is staggeredly voltage and current double closed-loop operation；
In forward direction operation, the rear class converter is used for through outer voltage output current-order, the electricity that then will test
Inducing current is compared with the current-order, by adjusting the duty ratio of multiple converters in the rear class converter come so that more
The electric current of a converter is identical；So that the output voltage of multiple converters is different in the prime variator；
In inverted running, the rear class converter is used for through outer voltage output current-order, the electricity that then will test
Inducing current is compared with the current-order, by adjusting the duty ratio of multiple converters in the rear class converter come so that more
The electric current of a converter is identical；So that the input voltage of multiple converters is different in the prime variator.
2. two-way DC/DC converter according to claim 1, which is characterized in that the front stage converter is LLC transformation
Device.
3. two-way DC/DC converter according to claim 1, which is characterized in that the rear class converter is Buck/
Boost.
4. a kind of control method of two-way DC/DC converter characterized by comprising
S11: in forward direction operation, control rear class converter is by outer voltage output current-order, the electricity that then will test
Inducing current is compared with the current-order, and the duty ratio for adjusting multiple converters in the rear class converter comes so that multiple changes
The electric current of parallel operation is identical；So that the output voltage of multiple converters is different in prime variator；
S12: in inverted running, control rear class converter is by outer voltage output current-order, the electricity that then will test
Inducing current is compared with the current-order, and the duty ratio for adjusting multiple converters in the rear class converter comes so that multiple changes
The electric current of parallel operation is identical；So that the input voltage of multiple converters is different in prime variator；
The process S11 and process S12 sequence in no particular order.
5. the control method of two-way DC/DC converter according to claim 4, which is characterized in that the front stage converter
For LLC converter.
6. the control method of two-way DC/DC converter according to claim 4, which is characterized in that the rear class converter
For Buck/Boost converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910394965.6A CN110138223B (en) | 2019-05-13 | 2019-05-13 | Bidirectional DC/DC converter and control method thereof |
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| CN201910394965.6A CN110138223B (en) | 2019-05-13 | 2019-05-13 | Bidirectional DC/DC converter and control method thereof |
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| CN110138223B CN110138223B (en) | 2020-03-10 |
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| CN116365886A (en) * | 2023-03-10 | 2023-06-30 | 深圳麦格米特电气股份有限公司 | Bidirectional DC/DC converter and energy storage device |
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| CN112117893B (en) * | 2020-07-27 | 2021-08-13 | 西安交通大学 | Quantity configuration control method and device for improving efficiency of two-stage multi-module converter |
| WO2023098146A1 (en) * | 2021-12-03 | 2023-06-08 | 上海安世博能源科技有限公司 | Direct current to direct current (dc-dc) converter and control method therefor |
| CN116365886A (en) * | 2023-03-10 | 2023-06-30 | 深圳麦格米特电气股份有限公司 | Bidirectional DC/DC converter and energy storage device |
| CN116365886B (en) * | 2023-03-10 | 2024-04-12 | 深圳麦格米特电气股份有限公司 | Bidirectional DC/DC converter and energy storage device |
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