CN112260543A - High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof - Google Patents
High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof Download PDFInfo
- Publication number
- CN112260543A CN112260543A CN202010990913.8A CN202010990913A CN112260543A CN 112260543 A CN112260543 A CN 112260543A CN 202010990913 A CN202010990913 A CN 202010990913A CN 112260543 A CN112260543 A CN 112260543A
- Authority
- CN
- China
- Prior art keywords
- network unit
- frequency
- voltage
- loop
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 86
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000000903 blocking effect Effects 0.000 claims description 28
- 230000010363 phase shift Effects 0.000 claims description 21
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 238000007600 charging Methods 0.000 claims description 13
- 238000010277 constant-current charging Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal 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 in a bridge configuration
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal 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
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a high-gain high-frequency isolation bidirectional cascade DC/DC converter and a control method thereof, wherein the converter comprises: the first cascade module and the second cascade module are connected in a cascade mode; the first cascade module includes: the high-frequency isolation transformer is characterized by comprising a first capacitor, a first switch network unit, a first resonance network unit or a first stopping network unit, a high-frequency isolation transformer, a second resonance network unit or a second stopping network unit and a second network switch unit which are sequentially connected in series in a cascade manner, wherein the first resonance network unit corresponds to the second resonance network unit, and the first stopping network unit corresponds to the first stopping network unit; the second cascade module includes: the second capacitor, the third switch network unit and the third capacitor are sequentially connected in series in cascade, and a third inductor is connected in series between the third network switch unit and the third capacitor. The low-voltage side and the high-voltage side are flexibly set by adopting a cascade structure, and the problems that the transmission ratio of the existing converter is small and the single-stage BUCK/BOOST isolation and the duty ratio are close to 1 are solved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a high-gain high-frequency isolation bidirectional cascade DC/DC converter and a control method thereof.
Background
The bidirectional DC/DC converter can realize bidirectional flow of energy, and is widely applied to occasions such as a direct-current non-power-outage system, an aviation power supply system, a solar power supply system, a carrier-based power supply and the like. The cascade bidirectional DC/DC converter is one of bidirectional DC/DC converters, has the advantages of respective optimized design of two parts, high power density, realization of large transformation ratio conversion and the like, and is widely applied to occasions with large voltage transmission, such as space power supplies, airplane high-voltage direct-current power distribution systems and the like, and particularly in distributed power supply systems, the application of the cascade bidirectional DC/DC converter is common. When the reference voltage of the direct current bus is high, the voltage transmission of the bidirectional DC/DC converter is required to be high, the single-stage bidirectional DC/DC converter cannot meet the requirement, and the cascade bidirectional DC/DC converter is required to meet the system requirement.
With the development of energy storage technology, the application of bidirectional DC/DC converters is being widely studied. In the prior art, two sets of topological devices are conventionally adopted, one set is used for charging the energy storage battery, the other set is used for discharging the energy storage battery, the main circuit topology is independent and control is independent, the two sets of devices carry out information interaction in a communication mode, and the two sets of devices jointly realize the bidirectional flow of energy of the energy storage battery; however, the two sets of hardware devices have the problems of higher cost, larger volume and heavier weight, and the problem of longer time for information interaction. The bidirectional BUCK/BOOST circuit topology can realize bidirectional flow of energy, so the bidirectional BUCK/BOOST circuit topology is widely applied, but when the difference between input voltage and output voltage is large, the duty ratio is close to 1, the BOOST inductive current ripple is large, the switch tube turn-off current is also large, and the bidirectional BUCK/BOOST circuit topology has the problems of low conversion efficiency and input and output common ground; in addition, when the duty cycle is close to 1, the dynamic performance of the converter will be affected.
Disclosure of Invention
The embodiment of the invention aims to provide a high-gain high-frequency isolation bidirectional cascade DC/DC converter, which has the advantages that the gain proportion of the voltage at the low-voltage side and the voltage at the high-voltage side is flexible by adopting a cascade structure, the problems that the voltage transmission ratio of the existing single-stage bidirectional isolation DC/DC converter is small, the isolation and the duty ratio of a single-stage BUCK/BOOST are close to 1 are solved, the gain can be flexibly converted and adjusted according to the requirement, and the bidirectional energy flow multi-mode control mode, the high-gain power conversion and the high-frequency electrical isolation are realized.
To solve the above technical problem, a first aspect of an embodiment of the present invention provides a high-gain high-frequency isolated bidirectional cascaded DC/DC converter, including: the power supply comprises a first cascade module and a second cascade module which are connected in a cascade mode, wherein the other end of the first cascade module is connected with a low-voltage side power supply, and the other end of the second cascade module is connected with a high-voltage side power supply;
the first cascade module includes: the high-frequency isolation transformer is characterized by comprising a first capacitor, a first switch network unit, a first resonance network unit or a first stopping network unit, a high-frequency isolation transformer, a second resonance network unit or a second stopping network unit and a second network switch unit which are sequentially connected in series in a cascade manner, wherein the first resonance network unit corresponds to the second resonance network unit, and the first stopping network unit corresponds to the first stopping network unit;
the second cascade module includes: the second capacitor, the third switch network unit and the third capacitor are sequentially connected in series in cascade, and a third inductor is connected in series between the third network switch unit and the third capacitor.
Further, the first switch network unit, the second switch network unit and/or the third switch network unit are power switch tubes.
Further, the first switching network unit and/or the second switching network unit are in a full-bridge structure or a half-bridge structure.
Furthermore, the driving control mode of the first resonant network unit and the second resonant network unit is PFM frequency modulation control; or
The driving control mode of the first blocking network unit and the second blocking network unit is PWM pulse width modulation.
Further, the first resonant network unit, the first switching network unit and the high-frequency isolation transformer form LC series resonance, LC parallel resonance, LCC series parallel resonance, LLC series parallel resonance, CLLC resonance or CLLLC resonance; and/or
The second resonant network unit, the high-frequency isolation transformer and the second switching network unit form LC series resonance, LC parallel resonance, LCC series-parallel resonance, LLC series-parallel resonance, CLLC resonance or CLLLC resonance.
Further, the first blocking network element and the second blocking network element comprise blocking inductors;
the first switch network unit and the second switch network unit are in a full-bridge structure;
the first blocking network unit, the second blocking network, the first switch network unit, the second switch network unit and the high-frequency isolation transformer form a double-active full-bridge converter.
Further, the driving control mode of the first blocking network unit and/or the second blocking network unit is single phase shift control, double phase shift control or triple phase shift control.
Further, the third switching network unit is a bidirectional BUCK/BOOST topology result;
the driving mode of the third switching network unit is BOOST control, BUCK control or BUCK/BOOST control.
Accordingly, a second aspect of the embodiments of the present invention provides a control method for a high-gain high-frequency isolation bidirectional cascaded DC/DC converter, for controlling any one of the above high-gain high-frequency isolation bidirectional cascaded DC/DC converters, including the following steps:
when energy is transferred from the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter to the high-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter is controlled in stages in a constant-voltage discharge control mode and a constant-;
when energy is transferred from the high-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter to the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, the high-gain high-frequency isolation bidirectional cascade DC/DC converter is controlled in stages in a constant-high-voltage charging control mode, a constant-current charging control mode and a constant-low-voltage charging control mode.
Further, the constant high-voltage discharge control mode is as follows: the high-voltage side feedback voltage value is compared with a given voltage value through double-loop control of a voltage outer loop and a current inner loop, a voltage value error enters a voltage loop PI controller, the output of the voltage loop PI controller is feedback current, the given current value is compared with the feedback current, a current value error enters a current loop PI controller, the output value of the current loop PI controller enters a PWM generator to form PWM3, a third switch network is driven through isolation and amplification, and the first switch network and the second switch network perform constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift; and/or
The constant current discharge control mode is as follows: by adopting a current inner loop, feedback current is compared with a given current value and a comprehensive value of a low-voltage side power supply SOC state, a current value error enters the current loop PI controller, an output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like.
Further, the constant high voltage charging control mode is as follows: in the normal working range of the high-frequency isolation converter, through double-loop control of a voltage outer loop and a current inner loop, a high-voltage side feedback voltage is compared with a given voltage value, a voltage value error enters the voltage loop PI controller, the output of the voltage loop PI controller is feedback current, the given current value is compared with the feedback current, a current value error enters the current loop PI controller, an output value enters the PWM generator to form PWM3, a third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift; and/or
The constant current charging control mode is as follows: by adopting a current inner loop, feedback current is compared with a given current value and a comprehensive value of a low-voltage side power supply SOC state, a current value error enters the current loop PI controller, an output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like; and/or
The constant low-voltage charging control mode is as follows: through double-loop control of the voltage outer loop and the current inner loop, low-voltage side feedback voltage is compared with a given voltage value, a voltage value error enters the voltage loop PI controller, the output of the voltage loop PI controller is used as feedback current, a given current value is compared with the feedback current, a current value error enters the current loop PI controller, the output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation and amplification, and the first switch network and the second switch network perform constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the gain proportion of the voltage of the low-voltage side and the high-voltage side is flexible by adopting a cascade structure, the problems that the voltage transmission ratio of the existing single-stage bidirectional isolation DC/DC converter is small and the isolation and the duty ratio of the single-stage BUCK/BOOST are close to 1 are solved, the gain can be flexibly adjusted according to the requirement, and the bidirectional energy flow multi-mode control mode, the high-gain power conversion and the high-frequency electrical isolation are realized.
Drawings
FIG. 1 is a schematic diagram of a high-gain high-frequency isolation bidirectional cascade DC/DC converter circuit provided by an embodiment of the invention;
FIG. 2 is a flowchart of a control method for a high-gain high-frequency isolation bidirectional cascade DC/DC converter according to an embodiment of the present invention;
fig. 3 is a logic diagram of a high-gain high-frequency isolation bidirectional cascaded DC/DC converter provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a high-gain high-frequency isolation bidirectional cascaded DC/DC converter circuit provided by an embodiment of the invention.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides a high-gain high-frequency isolated bi-directional cascaded DC/DC converter, including: the power supply comprises a first cascade module and a second cascade module which are in cascade connection, wherein the other end of the first cascade module is connected with a low-voltage side power supply, and the other end of the second cascade module is connected with a high-voltage side power supply; the first cascade module includes: the high-frequency isolation transformer is characterized by comprising a first capacitor C1, a first switch network unit, a first resonance network unit or a first stopping network unit, a high-frequency isolation transformer, a second resonance network unit or a second stopping network unit and a second network switch unit which are sequentially connected in series in a cascade manner, wherein the first resonance network unit corresponds to the second resonance network unit, and the first stopping network unit corresponds to the first stopping network unit; the second cascade module includes: the second capacitor C2, the third switching network unit and the third capacitor C3 are connected in series, and a third inductor is connected in series between the third network switching unit and the third capacitor C3.
The first capacitor C1 is an input filter capacitor, the second capacitor C2 is an input filter capacitor,
the first cascade module mainly realizes high-frequency isolation between the power supply 1 and the power supply 2, meanwhile, the transformation ratio of the high-frequency isolation transformer realizes a primary boosting multiple N1, and the second cascade module also realizes a primary boosting multiple N2. The main circuit topology is thus able to achieve a high gain with a gain N-N1N 2. The high-frequency isolation adopts a high-frequency isolation transformer; the first switch network is cascaded with the second switch network in series through a resonant network or a blocking network and a high-frequency isolation transformer, and the second switch network is cascaded with the third switch network in series.
Specifically, the first switch network unit, the second switch network unit and/or the third switch network unit are power switching tubes.
Optionally, the first switching network unit and/or the second switching network unit are in a full-bridge structure or a half-bridge structure.
Specifically, the driving control mode of the first resonant network unit and the second resonant network unit is PFM frequency modulation control; or the driving control mode of the first blocking network unit and the second blocking network unit is PWM pulse width modulation.
Optionally, the first resonant network unit, the first switching network unit and the high-frequency isolation transformer form LC series resonance, LC parallel resonance, LCC series parallel resonance, LLC series parallel resonance, CLLC resonance or CLLLC resonance; and/or the second resonant network unit, the high-frequency isolation transformer and the second switching network unit form LC series resonance, LC parallel resonance, LCC series-parallel resonance, LLC series-parallel resonance, CLLC resonance or CLLLC resonance.
Specifically, the first blocking network unit and the second blocking network unit include blocking inductors. When the first switch network unit and the second switch network unit are in a full-bridge structure, the first blocking network unit and the second blocking network, the first switch network unit, the second switch network unit and the high-frequency isolation transformer form a double-active full-bridge converter.
Optionally, the driving control manner of the first blocking network unit and/or the second blocking network unit is single phase shift control, double phase shift control, or triple phase shift control.
Specifically, the third switching network unit is a bidirectional BUCK/BOOST topology result. In addition, the third switching network unit is driven in a BOOST control mode, a BUCK control mode or a BUCK/BOOST control mode.
Fig. 2 is a flowchart of a control method of a high-gain high-frequency isolation bidirectional cascaded DC/DC converter according to an embodiment of the present invention.
Fig. 3 is a logic diagram of a high-gain high-frequency isolation bidirectional cascaded DC/DC converter provided by the embodiment of the invention.
Accordingly, referring to fig. 2 and fig. 3, a second aspect of the embodiments of the present invention provides a control method for a high-gain high-frequency isolated bidirectional cascaded DC/DC converter, for controlling any one of the above high-gain high-frequency isolated bidirectional cascaded DC/DC converters, including the following steps:
and S100, when energy is transferred from the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter to the high-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, the energy is controlled in stages in a constant-voltage discharge control mode and a constant-current discharge control mode.
And S200, when energy is transferred from the high-voltage side to the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, performing staged control in a constant-high-voltage charging control mode, a constant-current charging control mode and a constant-low-voltage charging control mode.
Specifically, the constant high-voltage discharge control mode is as follows: the voltage value U is fed back to the high-voltage side by double-loop control of the voltage outer loop and the current inner loop3With a given voltage value U3refComparing, the voltage value error enters a voltage loop PI controller, and the output is feedback current i3Given a current value i3refAnd a feedback current i3And comparing, wherein the current value error enters a current loop PI controller, the output value of the current value error enters a PWM generator to form PWM3, the third switching network is driven by isolation and amplification, and the first switching network and the second switching network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like. And/or the constant current discharge control mode is as follows: by using the current inner loop, feeding back the current i3With a given current value i3refComparing with the comprehensive value of the low-voltage side power supply SOC state, the current value error enters a current loop PI controller, the output value enters a PWM generator to form PWM3, and the PWM3 is isolatedThe amplification is used for driving the third switch network, and the first switch network and the second switch network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like.
Specifically, the constant high-voltage charging control mode is as follows: in the normal working range of the high-frequency isolation converter, the high-voltage side feeds back the voltage U through the double-loop control of the voltage outer loop and the current inner loop3With a given voltage value U3refComparing, the voltage value error enters a voltage loop PI controller, and the output is feedback current i3Given a current value i3refAnd a feedback current i3And comparing, wherein the current value error enters a current loop PI controller, the output value enters a PWM generator to form PWM3, the third switching network is driven by isolation amplification, and the first switching network and the second switching network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like. And/or the constant current charging control mode is as follows: by using the current inner loop, feeding back the current i3With a given current value i3refAnd comparing the current value error with the comprehensive value of the SOC state of the low-voltage side power supply, enabling the current value error to enter a current loop PI controller, enabling the output value of the current loop PI controller to enter a PWM generator to form PWM3, driving a third switching network through isolation amplification, and enabling the first switching network and the second switching network to carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like. And/or the constant low-voltage charging control mode is as follows: through the double-loop control of the voltage outer loop and the current inner loop, the low-voltage side feedback voltage U1 is equal to the given voltage value U1refComparing, the voltage value error enters a voltage loop PI controller, and the output of the voltage loop PI controller is used as a feedback current i1Given a current value i1refAnd a feedback current i1And comparing, wherein the current value error enters a current loop PI controller, the output value of the current value error enters a PWM generator to form PWM3, the third switching network is driven by isolation and amplification, and the first switching network and the second switching network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like.
Compared with the conventional high-frequency isolation bidirectional DC/DC converter and the control method, the high-frequency isolation bidirectional DC/DC converter has high gain, the gain ratio of the voltage of the low-voltage side and the voltage of the high-voltage side is flexibly improved and changed by adopting a cascade structure, and the large N1 of a single high-frequency isolation transformer is avoided. The problem that when the input voltage and the output voltage of a Boost converter are greatly different, the duty ratio is close to 1, the Boost inductance current ripple is large, the switching-off current of a switching tube is also large, and the conversion efficiency is low and the isolation problem are solved; in addition, when the duty cycle is close to 1, the dynamic performance of the converter will be affected. Meanwhile, the idea can be applied to interaction between the battery and the power grid, the low-voltage side can be different types of batteries with different voltage levels, the high-voltage side can be connected with the power grid through the DC/AC converter, and the positions of the first level and the second level can be adjusted as required.
The embodiment of the invention aims to protect a high-gain high-frequency isolation bidirectional cascade DC/DC converter and a control method thereof, wherein the converter comprises: the power supply comprises a first cascade module and a second cascade module which are in cascade connection, wherein the other end of the first cascade module is connected with a low-voltage side power supply, and the other end of the second cascade module is connected with a high-voltage side power supply; the first cascade module includes: the high-frequency isolation transformer is characterized by comprising a first capacitor, a first switch network unit, a first resonance network unit or a first stopping network unit, a high-frequency isolation transformer, a second resonance network unit or a second stopping network unit and a second network switch unit which are sequentially connected in series in a cascade manner, wherein the first resonance network unit corresponds to the second resonance network unit, and the first stopping network unit corresponds to the first stopping network unit; the second cascade module includes: the second capacitor, the third switch network unit and the third capacitor are sequentially connected in series in cascade, and a third inductor is connected in series between the third network switch unit and the third capacitor. The technical scheme has the following effects:
the gain proportion of the voltage of the low-voltage side and the high-voltage side is flexible by adopting a cascade structure, the problems that the voltage transmission ratio of the existing single-stage bidirectional isolation DC/DC converter is small and the isolation and the duty ratio of the single-stage BUCK/BOOST are close to 1 are solved, the gain can be flexibly adjusted according to the requirement, and the bidirectional energy flow multi-mode control mode, the high-gain power conversion and the high-frequency electrical isolation are realized.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (11)
1. A high-gain high-frequency isolated bi-directional cascaded DC/DC converter, comprising: the power supply comprises a first cascade module and a second cascade module which are connected in a cascade mode, wherein the other end of the first cascade module is connected with a low-voltage side power supply, and the other end of the second cascade module is connected with a high-voltage side power supply;
the first cascade module includes: the high-frequency isolation transformer is characterized by comprising a first capacitor, a first switch network unit, a first resonance network unit or a first stopping network unit, a high-frequency isolation transformer, a second resonance network unit or a second stopping network unit and a second network switch unit which are sequentially connected in series in a cascade manner, wherein the first resonance network unit corresponds to the second resonance network unit, and the first stopping network unit corresponds to the first stopping network unit;
the second cascade module includes: the second capacitor, the third switch network unit and the third capacitor are sequentially connected in series in cascade, and a third inductor is connected in series between the third network switch unit and the third capacitor.
2. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the first switch network unit, the second switch network unit and/or the third switch network unit are power switch tubes.
3. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the first switch network unit and/or the second switch network unit are in a full-bridge structure or a half-bridge structure.
4. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the driving control mode of the first resonant network unit and the second resonant network unit is PFM frequency modulation control; or
The driving control mode of the first blocking network unit and the second blocking network unit is PWM pulse width modulation.
5. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the first resonant network unit, the first switching network unit and the high-frequency isolation transformer form LC series resonance, LC parallel resonance, LCC series-parallel resonance, LLC series-parallel resonance, CLLC resonance or CLLLC resonance; and/or
The second resonant network unit, the high-frequency isolation transformer and the second switching network unit form LC series resonance, LC parallel resonance, LCC series-parallel resonance, LLC series-parallel resonance, CLLC resonance or CLLLC resonance.
6. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the first blocking network unit and the second blocking network unit comprise blocking inductors;
the first switch network unit and the second switch network unit are in a full-bridge structure;
the first blocking network unit, the second blocking network, the first switch network unit, the second switch network unit and the high-frequency isolation transformer form a double-active full-bridge converter.
7. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 6,
the driving control mode of the first blocking network unit and/or the second blocking network unit is single phase-shifting control, double phase-shifting control or three phase-shifting control.
8. The high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 1,
the third switching network unit is a bidirectional BUCK/BOOST topological result;
the driving mode of the third switching network unit is BOOST control, BUCK control or BUCK/BOOST control.
9. A control method of a high-gain high-frequency isolation bidirectional cascade DC/DC converter is characterized by being used for controlling the high-gain high-frequency isolation bidirectional cascade DC/DC converter according to any one of claims 1 to 8, and comprising the following steps:
when energy is transferred from the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter to the high-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter is controlled in stages in a constant-voltage discharge control mode and a constant-;
when energy is transferred from the high-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter to the low-voltage side of the high-gain high-frequency isolation bidirectional cascade DC/DC converter, the high-gain high-frequency isolation bidirectional cascade DC/DC converter is controlled in stages in a constant-high-voltage charging control mode, a constant-current charging control mode and a constant-low-voltage charging control mode.
10. The control method of the high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 9,
the constant high-voltage discharge control mode is as follows: the high-voltage side feedback voltage value is compared with a given voltage value through double-loop control of a voltage outer loop and a current inner loop, a voltage value error enters a voltage loop PI controller, the output of the voltage loop PI controller is feedback current, the given current value is compared with the feedback current, a current value error enters a current loop PI controller, the output value of the current loop PI controller enters a PWM generator to form PWM3, a third switch network is driven through isolation and amplification, and the first switch network and the second switch network perform constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift; and/or
The constant current discharge control mode is as follows: by adopting a current inner loop, feedback current is compared with a given current value and a comprehensive value of a low-voltage side power supply SOC state, a current value error enters the current loop PI controller, an output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like.
11. The control method of the high-gain high-frequency isolated bi-directional cascaded DC/DC converter according to claim 9,
the constant high-voltage charging control mode is as follows: in the normal working range of the high-frequency isolation converter, through double-loop control of a voltage outer loop and a current inner loop, a high-voltage side feedback voltage is compared with a given voltage value, a voltage value error enters the voltage loop PI controller, the output of the voltage loop PI controller is feedback current, the given current value is compared with the feedback current, a current value error enters the current loop PI controller, an output value enters the PWM generator to form PWM3, a third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift; and/or
The constant current charging control mode is as follows: by adopting a current inner loop, feedback current is compared with a given current value and a comprehensive value of a low-voltage side power supply SOC state, a current value error enters the current loop PI controller, an output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation amplification, and the first switch network and the second switch network carry out constant-frequency and constant-width open loop control according to factors such as duty ratio, frequency, synchronization, phase shift and the like; and/or
The constant low-voltage charging control mode is as follows: through double-loop control of the voltage outer loop and the current inner loop, low-voltage side feedback voltage is compared with a given voltage value, a voltage value error enters the voltage loop PI controller, the output of the voltage loop PI controller is used as feedback current, a given current value is compared with the feedback current, a current value error enters the current loop PI controller, the output value of the current loop PI controller enters the PWM generator to form PWM3, the third switch network is driven through isolation and amplification, and the first switch network and the second switch network perform constant-frequency and constant-width open-loop control according to factors such as duty ratio, frequency, synchronization and phase shift.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010990913.8A CN112260543B (en) | 2020-09-19 | 2020-09-19 | A high-gain high-frequency isolation bidirectional cascaded DC/DC converter and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010990913.8A CN112260543B (en) | 2020-09-19 | 2020-09-19 | A high-gain high-frequency isolation bidirectional cascaded DC/DC converter and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112260543A true CN112260543A (en) | 2021-01-22 |
| CN112260543B CN112260543B (en) | 2022-06-24 |
Family
ID=74231298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010990913.8A Expired - Fee Related CN112260543B (en) | 2020-09-19 | 2020-09-19 | A high-gain high-frequency isolation bidirectional cascaded DC/DC converter and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112260543B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI862411B (en) * | 2024-02-02 | 2024-11-11 | 國立陽明交通大學 | Bidirectional voltage conversion device |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522897A (en) * | 2011-12-14 | 2012-06-27 | 南京航空航天大学 | Bidirectional direct-current converter with high buck-boost ratio |
| CN104038070A (en) * | 2014-04-15 | 2014-09-10 | 浙江大学 | Transformer primary side series connection LLC and output parallel connection BUCK two-stage converter |
| US20150280455A1 (en) * | 2014-03-31 | 2015-10-01 | Abb Technology Ag | Inductive power transfer system and method for operating an inductive power transfer system |
| CN105406720A (en) * | 2015-12-17 | 2016-03-16 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Control method based on cascade bidirectional DC-DC converter |
| US20160094135A1 (en) * | 2014-09-29 | 2016-03-31 | Futurewei Technologies, Inc. | Serial Hybrid Converter Apparatus and Method |
| CN205490160U (en) * | 2016-01-04 | 2016-08-17 | 河南理工大学 | Two -way DCDC converter topology based on ultracapacitor system energy storage system |
| CN105978370A (en) * | 2016-05-26 | 2016-09-28 | 全球能源互联网研究院 | Sine power transmission method for improving electric power electronic transformer power density |
| US20170126010A1 (en) * | 2014-07-17 | 2017-05-04 | Abb Schweiz Ag | Power converter system for renewable energy sources |
| CN206992965U (en) * | 2017-05-17 | 2018-02-09 | 苏州汇川联合动力系统有限公司 | Reversible transducer |
| CN108075665A (en) * | 2016-11-11 | 2018-05-25 | 艾思玛新能源技术（江苏）有限公司 | A kind of cascade bi-directional DC-DC converter control method and device |
| CN108631639A (en) * | 2017-03-17 | 2018-10-09 | 深圳耐斯特思新能源科技有限公司 | Two-way DC-AC translation circuits for energy storage inverter |
| CN109039088A (en) * | 2018-08-12 | 2018-12-18 | 苏州首汇能源科技有限公司 | A kind of full-bridge type two-way DC/DC control system in photovoltaic power generation |
| CN109088545A (en) * | 2018-06-19 | 2018-12-25 | 华中科技大学 | A kind of phase synchronization method of bidirectional radio energy Transmission system |
| CN109450241A (en) * | 2018-11-19 | 2019-03-08 | 阳光电源股份有限公司 | A kind of two-way DC/DC converter of two-stage type and its reverse starting control method |
| US20190097543A1 (en) * | 2016-05-25 | 2019-03-28 | Leopold Kostal Gmbh & Co. Kg | Bidirectional DC Converter Assembly Having Cascade of Isolated Resonant Converter and Step-Up/Step-Down Converter |
| US20190288607A1 (en) * | 2017-02-04 | 2019-09-19 | Abb Schweiz Ag | Dc-dc converter and control method |
| CN110336320A (en) * | 2019-07-10 | 2019-10-15 | 上海交通大学 | A new energy grid-connected or on-site consumption system based on a power router |
| CN110365213A (en) * | 2018-04-11 | 2019-10-22 | 南京南瑞继保电气有限公司 | A kind of two-way DC converter and its control method of the group of mould containing two types |
| CN110601544A (en) * | 2019-09-16 | 2019-12-20 | 湖南大学 | Modular combined medium-voltage direct-current converter based on two-stage conversion structure and control method |
| CN110798074A (en) * | 2019-11-11 | 2020-02-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Cascade type single-phase alternating current-to-direct current isolation converter |
| CN111064359A (en) * | 2019-12-23 | 2020-04-24 | 南京航空航天大学 | Wide-range bidirectional conversion circuit and control method |
| CN111130172A (en) * | 2019-12-23 | 2020-05-08 | 绍兴市上虞区理工高等研究院 | Vehicle charging system and electric vehicle |
| CN111342665A (en) * | 2020-02-24 | 2020-06-26 | 华中科技大学 | An isolated bidirectional DC-DC converter and its control method |
-
2020
- 2020-09-19 CN CN202010990913.8A patent/CN112260543B/en not_active Expired - Fee Related
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522897A (en) * | 2011-12-14 | 2012-06-27 | 南京航空航天大学 | Bidirectional direct-current converter with high buck-boost ratio |
| US20150280455A1 (en) * | 2014-03-31 | 2015-10-01 | Abb Technology Ag | Inductive power transfer system and method for operating an inductive power transfer system |
| CN104038070A (en) * | 2014-04-15 | 2014-09-10 | 浙江大学 | Transformer primary side series connection LLC and output parallel connection BUCK two-stage converter |
| US20170126010A1 (en) * | 2014-07-17 | 2017-05-04 | Abb Schweiz Ag | Power converter system for renewable energy sources |
| US20160094135A1 (en) * | 2014-09-29 | 2016-03-31 | Futurewei Technologies, Inc. | Serial Hybrid Converter Apparatus and Method |
| CN105406720A (en) * | 2015-12-17 | 2016-03-16 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Control method based on cascade bidirectional DC-DC converter |
| CN205490160U (en) * | 2016-01-04 | 2016-08-17 | 河南理工大学 | Two -way DCDC converter topology based on ultracapacitor system energy storage system |
| US20190097543A1 (en) * | 2016-05-25 | 2019-03-28 | Leopold Kostal Gmbh & Co. Kg | Bidirectional DC Converter Assembly Having Cascade of Isolated Resonant Converter and Step-Up/Step-Down Converter |
| CN105978370A (en) * | 2016-05-26 | 2016-09-28 | 全球能源互联网研究院 | Sine power transmission method for improving electric power electronic transformer power density |
| CN108075665A (en) * | 2016-11-11 | 2018-05-25 | 艾思玛新能源技术（江苏）有限公司 | A kind of cascade bi-directional DC-DC converter control method and device |
| US20190288607A1 (en) * | 2017-02-04 | 2019-09-19 | Abb Schweiz Ag | Dc-dc converter and control method |
| CN108631639A (en) * | 2017-03-17 | 2018-10-09 | 深圳耐斯特思新能源科技有限公司 | Two-way DC-AC translation circuits for energy storage inverter |
| CN206992965U (en) * | 2017-05-17 | 2018-02-09 | 苏州汇川联合动力系统有限公司 | Reversible transducer |
| CN110365213A (en) * | 2018-04-11 | 2019-10-22 | 南京南瑞继保电气有限公司 | A kind of two-way DC converter and its control method of the group of mould containing two types |
| CN109088545A (en) * | 2018-06-19 | 2018-12-25 | 华中科技大学 | A kind of phase synchronization method of bidirectional radio energy Transmission system |
| CN109039088A (en) * | 2018-08-12 | 2018-12-18 | 苏州首汇能源科技有限公司 | A kind of full-bridge type two-way DC/DC control system in photovoltaic power generation |
| CN109450241A (en) * | 2018-11-19 | 2019-03-08 | 阳光电源股份有限公司 | A kind of two-way DC/DC converter of two-stage type and its reverse starting control method |
| CN110336320A (en) * | 2019-07-10 | 2019-10-15 | 上海交通大学 | A new energy grid-connected or on-site consumption system based on a power router |
| CN110601544A (en) * | 2019-09-16 | 2019-12-20 | 湖南大学 | Modular combined medium-voltage direct-current converter based on two-stage conversion structure and control method |
| CN110798074A (en) * | 2019-11-11 | 2020-02-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Cascade type single-phase alternating current-to-direct current isolation converter |
| CN111064359A (en) * | 2019-12-23 | 2020-04-24 | 南京航空航天大学 | Wide-range bidirectional conversion circuit and control method |
| CN111130172A (en) * | 2019-12-23 | 2020-05-08 | 绍兴市上虞区理工高等研究院 | Vehicle charging system and electric vehicle |
| CN111342665A (en) * | 2020-02-24 | 2020-06-26 | 华中科技大学 | An isolated bidirectional DC-DC converter and its control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112260543B (en) | 2022-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jadhav et al. | Bidirectional DC-DC converter in solar PV system for battery charging application | |
| Chien et al. | Novel three-port converter with high-voltage gain | |
| Ashique et al. | A high-gain, high-efficiency nonisolated bidirectional DC–DC converter with sustained ZVS operation | |
| Gandhi et al. | Topological review and analysis of DC-DC boost converters | |
| CN101814827A (en) | Two-stage type DC converter with high voltage input and low-voltage large current output | |
| Al-Obaidi et al. | A review of non-isolated bidirectional DC-DC converters for hybrid energy storage system | |
| Czarkowski | DC–DC Converters | |
| CN101741240A (en) | Topological structure of bidirectional DC/DC converter and converter | |
| Zandabad et al. | Soft-switching buck/boost full-bridge three-port converter for DC/DC applications | |
| CN210724563U (en) | A Novel Boost DC-DC Converter Topology with TΓ | |
| Saleeb et al. | Highly efficient isolated multiport bidirectional DC/DC converter for PV applications | |
| CN112260543A (en) | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof | |
| CN111293884B (en) | A non-isolated bidirectional DC converter for energy applications | |
| CN111049380A (en) | Three-port B3R power supply circuit based on MPPT technology | |
| CN117134622A (en) | Cascaded DC/DC converter for multiplexing devices | |
| Wu et al. | 1.5 kW isolated bi-directional DC-DC converter with a flyback snubber | |
| CN116937672A (en) | Distributed photovoltaic energy storage equipment | |
| Liu et al. | A Dual Active Bridge Converter Integrating Buck-Boost for Wide Voltage Range | |
| Tayebi et al. | Control design of a dual-input LLC converter for PV-battery applications | |
| Zhang et al. | Hybrid structure for an input-parallel output-serial DC-DC combined converter with high efficiency and high power density | |
| Pakkiraiah et al. | Isolated Bi-directional DC-DC converter's performance and analysis with Z-source by using PWM control strategy | |
| Wei et al. | A function decoupling partially isolated high voltage gain DC/DC converter for PV application | |
| CN210007624U (en) | high transformation ratio bidirectional half-bridge current-doubling converter | |
| Gunawardena et al. | Battery Charger Based on Bi-directional High Step-Up/Down DC-DC Converter | |
| CN205666756U (en) | Power transfer device based on isolated form full -bridge booster converter circuit structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |