CN111313711A - Inductance same-direction coupling high-frequency star LLC resonance conversion device and control method thereof - Google Patents
Inductance same-direction coupling high-frequency star LLC resonance conversion device and control method thereof Download PDFInfo
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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
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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
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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
- 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
- H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M1/0048—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
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- 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
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Abstract
The invention discloses an inductance same-direction coupling high-frequency star LLC resonance conversion device and a control method thereof, wherein the device comprises: the primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group; and the secondary output circuit comprises more than or equal to two high-frequency star-connected LLC resonant output circuits, an LLC resonant output circuit and a transformer secondary output circuit comprising a transformer. The inductance homodromous coupling high-frequency star LLC resonant conversion device and the control method thereof have the advantages of high efficiency, high power density, low cost and high reliability.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to an inductance same-direction coupling high-frequency star LLC resonance conversion device and a control method thereof.
Background
With the development of computer and communication technologies, low-voltage and high-current switching power supplies are also an important research subject, and in power supplies outputting low-voltage and high-current power supplies in the industry, for example, 20VDC/1000A, most of the power supply DC/DC conversion technologies are phase-shifted full-bridge technologies, which have relatively low conversion efficiency, large volume and low power density. If single full-bridge LLC resonance DC/DC conversion is adopted, the conversion efficiency can be improved by utilizing the characteristics that a zero-voltage switch (ZVS) in the full-load range of an MOSFET (metal oxide semiconductor field effect transistor) in an LLC (inductor-capacitor) full-bridge resonance circuit is utilized, the off current is greatly reduced by increasing the excitation inductor when the switching frequency is less than or equal to the resonance frequency, and a secondary side rectifier diode hardly has reverse recovery, but the defects of overlarge current pulsation of an output end, large space and volume and more cost are caused; if high-frequency star LLC resonance is adopted, output pulsation can be effectively reduced, space and cost are reduced, reliability is improved, and engineering implementation is more feasible, but when two high-frequency star LLC resonances are combined, two topologies of original parallel secondary side connection and original series secondary side connection are typical, and current sharing of two high-frequency star LLC resonance transformation is ensured by adopting some effective control strategies; for the topology with the primary side connected in series and the secondary side connected in parallel, the primary side input voltages of the two star-shaped LLC resonances are usually ensured to be equal, for example, a midpoint balance method or other effective control strategies are adopted, so that the topology is equivalent to the topology with the input and the output directly connected in parallel. For the topology that two high-frequency star LLC resonant input and output are directly connected in parallel, when the deviation of the resonant parameters from the central value is large, the problem of obvious difference of output currents of two paths of conversion still occurs. The DC/DC conversion technology in the existing switching power supply adopts a phase-shifted full-bridge technology, a lag bridge arm realizes ZVS related to the magnitude of load current, and soft switching can not be realized under light load; the output rectifier diode has reverse recovery loss, so that the conversion efficiency is influenced, the output needs larger-size inductance L filtering, the cost is increased, and the size of the converter is influenced. In the two high-frequency star LLC resonant DC/DC conversion circuit structures, the two high-frequency resonant conversion power switching tubes, the diode resonant inductor and the main transformer have great difference in loss, so that the electrical stress or the thermal stress is easily caused to exceed the design requirement, or the potential reliability hazard is caused.
Therefore, how to provide a scheme for self-current-sharing high-frequency star LLC resonant combined transformation is a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention provides an inductance same-direction coupling high-frequency star LLC resonant conversion device and a control method thereof, and aims to solve the technical problems of low DC/DC conversion efficiency, poor reliability, high cost and large converter volume in a power supply in the prior art.
The invention provides an inductance same-direction coupling high-frequency star LLC resonance conversion device, comprising: the primary side input circuit is connected with the secondary side output circuit through a transformer;
the primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group;
two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit connected in a high-frequency star manner; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; the LLC resonant circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit connected in a high-frequency star shape, the terminating ends of primary windings of the transformers in the LLC resonant circuit are connected to form a star-shaped connection point;
the secondary output circuit comprises an LLC resonance output circuit which is connected by two or more high-frequency star circuits, the LLC resonance output circuit which is connected by the high-frequency star circuits comprises two or more LLC resonance output circuits, the LLC resonance output circuit comprises the secondary output circuit of the transformer, and the secondary output circuit of the transformer comprises: the secondary side of each transformer is connected with the output control and then connected to the half-wave power supply rectification output end.
Optionally, the primary sides of the transformers in the primary side input circuit are connected in parallel, and the secondary sides of the transformers in the secondary side output circuit are connected in parallel.
Optionally, in the primary side input circuit, the driving signals of the upper and lower tubes of each bridge arm are different by 180 degrees.
Optionally, wherein in the primary side input circuit, the driving signals of different bridge arms are 120 degrees out of phase.
Optionally, the secondary side of each transformer is a half-wave rectification output circuit.
Optionally, the output control is an output diode or a MOS transistor.
Optionally, the primary side input circuit includes 6 LLC resonant circuits, and the secondary side output circuit includes 6 LLC resonant output circuits.
Optionally, 6 bridge arms of 6 paths of the LLC resonant circuits in the primary-side input circuit are divided into two sets of star-connected bridge arm groups, and the switch driving signals of 3 bridge arms in the star-connected bridge arm groups are the same in phase with respect to the driving signals of the other set of 3 bridge arms.
Optionally, in the star-connected bridge arm set, the resonant inductors correspondingly connected to the same-phase bridge arms of each pair of switch driving signals are coupled in the same direction.
On the other hand, the invention also provides a control method of the inductance same-direction coupling high-frequency star LLC resonant conversion device, which is characterized by comprising the following steps:
the input voltage is input at the input end of a primary side input circuit, the primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group;
two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit connected in a high-frequency star manner; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; the LLC resonant circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit connected in a high-frequency star shape, the terminating ends of primary windings of the transformers in the LLC resonant circuit are connected to form a star-shaped connection point;
the input voltage passes through the primary side of the transformer in the LLC resonant circuit in the high-frequency star connection, and enters a secondary side output circuit after being converted by the transformer; the secondary output circuit comprises an LLC resonance output circuit which is connected by two or more high-frequency star circuits, the LLC resonance output circuit which is connected by the high-frequency star circuits comprises two or more LLC resonance output circuits, the LLC resonance output circuit comprises the secondary output circuit of the transformer, and the secondary output circuit of the transformer comprises: the secondary side of each transformer is connected with the output control and then connected to the half-wave power supply rectification output end;
and current sharing is output through the power supply half-wave rectification output end in the secondary side output circuit.
According to the inductance same-direction coupling high-frequency star LLC resonant conversion device and the control method thereof, the LLC resonant converter is adopted, ZVS and controllable turn-off current in the full load range of the switching tube are realized, zero current turn-off (ZCS) is approximate, diode rectification or synchronous rectification is adopted on the secondary side, and the loss caused by the diode can be reduced due to the fact that the diode does not have reverse recovery, and the conversion efficiency is greatly improved. The DC/DC conversion structure with the two high-frequency star LLC resonant conversions directly connected in parallel can effectively solve the problems in the prior art and has the advantages of high efficiency, high power density, low cost, high reliability and the like.
The mode that the resonant inductors of the same-phase bridge arms are coupled in the same direction is adopted, the two high-frequency star-shaped LLC resonant converters are directly connected in parallel to form a DC/DC conversion structure, large deviation does not exist in the resonant inductors of the same-phase bridge arms due to direct coupling relation, when the resonant capacitors are also deviated from a central value, the output current of the second star-shaped LLC resonant converter is about 13% larger than that of the first star-shaped LLC resonant converter, the current equalization is remarkably improved, and the automatic current equalization function effect is achieved.
Two star LLC resonant transformation realize well flow equalizing, have reduced total loss, have reduced voltage current stress, have reduced the thermal stress of switch tube, main transformer and resonance inductance, also reduce the cost, have promoted the reliability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a phase-shifted full-bridge inverter circuit according to the prior art;
FIG. 2 is a schematic structural diagram of two high-frequency star LLC resonant conversion parallel circuits;
FIG. 3 is a graph of simulation effect of output current after resonance parameters of two high-frequency star LLC resonance transformation parallel circuits deviate from a central value;
fig. 4 is a schematic circuit structure diagram of an inductance homodromous coupling high-frequency star LLC resonant conversion apparatus in the embodiment of the present invention;
FIG. 5 is a diagram illustrating simulation effects of output currents of an inductive homodromous coupling high-frequency star LLC resonant conversion parallel circuit when resonant capacitance parameters are also deviated from a central value in the embodiment of the present invention;
fig. 6 is a flowchart illustrating a control method of an inductance co-directional coupling high-frequency star LLC resonant conversion apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the DC/DC conversion technology in the conventional power supply adopts a phase-shifted full-bridge technology, which is a mature soft switching technology, and the so-called phase-shifted control mode is that S1 and S2 are alternately turned on, and are turned on by 180 electrical degrees, as are S3 and S4. However, S1 (or S2) and S4 (or S3) are not simultaneously turned on, but are turned on at a certain electrical angle, wherein S1 and S2 are turned off before S4 and S3, respectively, so the arm composed of S1 and S2 is called an leading arm, and the arm composed of S3 and S4 is called a lagging arm. The ZVS of the switch is achieved in a phase-shifted manner in combination with the resonance of the inductor and the switched junction capacitance (or parallel capacitance). However, the realization of ZVS by the lag bridge arm is related to the magnitude of load current, so that soft switching cannot be realized under light load; in addition, the reverse recovery loss exists in the output rectifier diode, so that the conversion efficiency is influenced; and the output needs inductance L filtering with larger volume, which increases the cost and affects the volume of the converter.
As shown in fig. 2 and 3, fig. 2 is a structure of two high-frequency star LLC resonant DC/DC conversion circuits; FIG. 3 is a graph showing the simulation effect of the output current after the resonance parameters of two high frequency star LLC resonant transformation parallel circuits deviate from the central value, when the resonance inductance deviation central value in the first star resonant transformation is + 5%, and the resonant inductance in the second star resonance deviates from the center by-5% when the resonant capacitance deviates from the center by + 5%, when the resonant capacitance deviates from the central value by-5%, the output current of the second star type resonant transformation is about 120% larger than that of the first star type resonant transformation, the output current of the first star type LLC resonance is about 310A, the output current of the second star type LLC resonance is about 670A, the two currents are greatly different, this will cause the loss difference between the two high-frequency resonant transformation power switching tubes, the diode resonant inductor and the main transformer to be large, and easily cause the electrical stress or thermal stress to exceed the design requirement, or cause the reliability hidden trouble.
Thus, as shown in fig. 4 and fig. 5, fig. 4 is a schematic circuit structure diagram of the high-frequency star LLC resonant conversion apparatus with inductance co-directional coupling proposed in this embodiment; fig. 5 is a graph showing simulation effects of output currents of the high-frequency star LLC resonant conversion parallel circuit with good self-current sharing in the present embodiment when resonant capacitance parameters also deviate from a central value, where the inductance homodromous coupling high-frequency star LLC resonant conversion apparatus includes: the primary side input circuit is connected with the secondary side output circuit through a transformer.
The primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group.
Two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit in high-frequency star connection; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; an LLC resonant circuit comprising: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit of the high-frequency star connection, the terminating ends of primary windings of a transformer in the LLC resonant circuit are connected to form a star connection point.
Vice limit output circuit, the LLC resonance output circuit that high frequency star including being greater than or equal to two ways is connected, the LLC resonance output circuit that high frequency star is connected, including the LLC resonance output circuit of being greater than or equal to two ways, LLC resonance output circuit, including the vice limit output circuit of transformer, the vice limit output circuit of transformer includes: the secondary side of each transformer is connected with the output control and then connected to the half-wave rectification output end of the power supply.
In some alternative embodiments, the primary sides of the transformers in the primary side input circuit are connected in parallel, and the secondary sides of the transformers in the secondary side output circuit are connected in parallel.
In some alternative embodiments, the drive signals for the upper and lower tubes of each leg are 180 degrees apart in the primary input circuit.
In some alternative embodiments, the drive signals between the different legs are 120 degrees out of phase in the primary input circuit.
In some alternative embodiments, the secondary side of each transformer is a half-wave rectified output circuit.
In some alternative embodiments, the output control is an output diode (as shown in fig. 4) or a MOS transistor.
In some optional embodiments, the primary side input circuit comprises 6 LLC resonant circuits, and the secondary side output circuit comprises 6 LLC resonant output circuits.
In some alternative embodiments, the 6 bridge arms of the 6-way LLC resonant circuit in the primary input circuit are divided into two sets of star-connected bridge arms, and the switching drive signals of 3 bridge arms in the set of star-connected bridge arms are in phase with respect to the drive signals of the other set of 3 bridge arms.
In some alternative embodiments, in the star-connected bridge arm set, the secondary sides of the transformers corresponding to the same phase bridge arms of each pair of switch driving signals are connected in series in a cross manner.
Referring to fig. 4, the power supply circuit is applied to a power supply circuit with an input voltage of positive 400VDC and an output of 20VDC/1000A as a specific embodiment. The whole power supply circuit comprises 6 primary side input circuits and 12 secondary side output circuits from top to bottom, wherein the primary side is an LLC resonant circuit in a high-frequency star connection mode, and one primary side input circuit corresponds to two coupled secondary side output circuits; each primary side input circuit comprises two switches, an inductor, a resonant capacitor and a primary side of a transformer; each secondary side output circuit comprises a secondary side of the transformer, an output diode or a MOS tube.
Specifically, the input voltage Vi is respectively connected with 6 primary side input circuits; the first primary side input circuit comprises a first switch S1 and a second switch S2, wherein the second switch S2 is grounded, the first switch S1 and the second switch S2 are connected with a first dotted terminal of a first coupling inductor L1, the other end of the first coupling inductor L1, which is connected with the first dotted terminal and belongs to the same winding, is connected with a first resonant capacitor C1, the other end of the first resonant capacitor C1 is connected with a primary side winding of a first transformer T1, and the other end of the primary side winding of the first transformer T1 is connected with one end of a second transformer T2 and one end of a third transformer T3 to form a first star-shaped resonant star-shaped connection point; the first secondary output circuit and the second secondary output circuit are formed by connecting a first diode D1 and a second diode D2 to two secondary sides of a first transformer T1 respectively to form a full-wave rectification circuit.
The second primary side input circuit comprises a third switch S3 and a fourth switch S4, wherein the fourth switch S4 is grounded, the third switch S3 and the fourth switch S4 are connected with a first dotted terminal of a second coupling inductor L2, the other end of the second coupling inductor L1, which is connected with the first dotted terminal and belongs to the same winding, is connected with a second resonant capacitor C2, the other end of the second resonant capacitor C2 is connected with a primary side winding of a second transformer T2, and the other end of the primary side winding of the second transformer T2 is connected with one end of a first transformer T1 and one end of a third transformer T3 to form a star-shaped connection point of a first star-shaped resonance; the third secondary side output circuit and the fourth secondary side output circuit are respectively connected with a third diode D3 and a fourth diode D4 through two secondary sides of a second transformer T2 to form a full-wave rectification circuit.
The third primary side input circuit comprises a fifth switch S5 and a sixth switch S6, wherein the sixth switch S6 is grounded, the fifth switch S5 and the sixth switch S6 are connected with a first dotted terminal of a third coupling inductor L3, the other end, connected with the first dotted terminal, of the third coupling inductor L1, of the same winding is connected with a third resonant capacitor C3, the other end of the third resonant capacitor C3 is connected with a primary side winding of a third transformer T3, and the other end of the primary side winding of the third transformer T3 is connected with one end of a first transformer T1 and one end of a second transformer T2 to form a star connection point of the first star resonance; the fifth secondary side output circuit and the sixth secondary side output circuit are formed by respectively connecting a fifth diode D5 and a sixth diode D6 to two secondary sides of a third transformer T3 to form a full-wave rectification circuit.
The fourth primary side input circuit comprises a seventh switch S7 and an eighth switch S8, wherein the eighth switch S8 is grounded, the seventh switch S7 and the eighth switch S8 are connected with a second dotted terminal of a first coupling inductor L1, the other end of the first coupling inductor L1, which is connected with the second dotted terminal and belongs to the same winding, is connected with a fourth resonant capacitor C4, the other end of the fourth resonant capacitor C4 is connected with a primary side winding of a fourth transformer T4, and the other end of the primary side winding of the fourth transformer T4 is connected with one end of a fifth transformer T5 and one end of a sixth transformer T6 to form a star-shaped connection point of a second star-shaped resonance; the seventh secondary output circuit and the eighth secondary output circuit are full-wave rectification circuits formed by connecting a seventh diode D7 and an eighth diode D8 to the two secondary sides of a fourth transformer T4 respectively.
The fifth primary side input circuit comprises a ninth switch S9 and a tenth switch S10, wherein the tenth switch S10 is grounded, the ninth switch S9 and the tenth switch S10 are connected with a second dotted terminal of a second coupling inductor L2, the other end of the second coupling inductor L2, which is connected with the second dotted terminal and belongs to the same winding, is connected with a fifth resonant capacitor C5, the other end of the fifth resonant capacitor C5 is connected with a primary side winding of a fifth transformer T5, and the other end of the primary side winding of the fifth transformer T5 is connected with one end of a fourth transformer T4 and one end of a sixth transformer T6 to form a star-shaped connection point of the second star-shaped resonance; the ninth secondary side output circuit and the tenth secondary side output circuit are respectively connected with a ninth diode D9 and a twelfth diode D10 through two secondary sides of a fifth transformer T5 to form a full-wave rectification circuit.
The sixth primary side input circuit comprises an eleventh switch S11 and a twelfth switch S12, wherein the twelfth switch S12 is grounded, the eleventh switch S11 and the twelfth switch S12 are connected with a second dotted terminal of a third coupling inductor L3, the other end of the third coupling inductor L3, which is connected with the second dotted terminal and belongs to the same winding, is connected with a sixth resonant capacitor C6, the other end of the sixth resonant capacitor C6 is connected with a primary side winding of a sixth transformer T6, the other end of the primary side winding of the sixth transformer T6 is connected with one end of a fifth transformer T5 and one end of a fourth transformer T4, and a star-shaped connection point of a second star-shaped resonance is formed; the eleventh secondary side output circuit and the twelfth secondary side output circuit are respectively connected with an eleventh diode D11 and a twelfth diode D12 by two secondary sides of a sixth transformer T6 to form a full-wave rectification circuit.
Meanwhile, a driving sequence of the embodiment is explained, a first primary side input circuit, a second primary side input circuit and a third primary side input circuit form a first star connection, a fourth primary side input circuit, a fifth primary side input circuit and a sixth primary side input circuit form a second star connection, 3 bridge arms of each star connection have a phase difference of 120 degrees in driving signals, and upper and lower tubes of the same bridge arm have a phase difference of 180 degrees; in the specific embodiment, the phases of the driving signals of the upper and lower tubes of the two bridge arms which are connected with the same coupling inductor and belong to different star LLC resonances are the same, or the phases of the bridge arms are the same. The input of the embodiment is positive 400VDC, 6 bridge arms on the primary side are all connected between 400VDC and ground potential, pipe-lower pipe drives on the 6 bridge arms are complementary, and 3 bridge arm drives forming star connection have 120-degree phase difference in sequence.
The primary sides of the two star-shaped connections of the first to sixth primary side input circuits are connected in parallel, and the secondary sides of the transformers T1-T6 of the first to twelfth secondary side output circuits are connected in parallel. The multi-path interleaving parallel connection is realized through the layout, the input voltage Vi is added to 6 paths of primary side input circuits and then is rectified and parallel connected to the output voltage Vo through 6 transformers, a filter capacitor C is connected in front of the output voltage Vo, and the multi-path interleaving effectively reduces the pulsation of the output current.
As shown in fig. 6, which is a schematic flow step diagram of a control method of an inductance co-directional coupling high-frequency star LLC resonant conversion apparatus in this embodiment, the control method can be implemented by the inductance co-directional coupling high-frequency star LLC resonant conversion apparatus, and specifically includes the following steps:
step 601, inputting voltage at the input end of the primary side input circuit, controlling the voltage through two resonance switches, a coupling inductor and a resonance capacitor in the LLC resonance circuit of the primary side input circuit, and then flowing through the primary side of the transformer to enter the transformer.
The primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group.
Two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit in high-frequency star connection; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; an LLC resonant circuit comprising: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit of the high-frequency star connection, the terminating ends of primary windings of a transformer in the LLC resonant circuit are connected to form a star connection point.
And step 602, converting the input voltage through a primary side of a transformer in the LLC resonant circuit in the high-frequency star connection and then entering a secondary side output circuit.
Vice limit output circuit, the LLC resonance output circuit that high frequency star including being greater than or equal to two ways is connected, the LLC resonance output circuit that high frequency star is connected, including the LLC resonance output circuit of being greater than or equal to two ways, LLC resonance output circuit, including the vice limit output circuit of transformer, the vice limit output circuit of transformer includes: the secondary side of each transformer is connected with the output control and then connected to the half-wave rectification output end of the power supply.
And 603, outputting current sharing through a power supply half-wave rectification output end in the secondary side output circuit.
Compared with the prior art, the scheme has high conversion efficiency. The adoption of the phase-shifted full-bridge technology can not realize ZVS of the switching tube in the full-load range, and is hard turn-off, and the reverse recovery of the secondary side rectifier diode exists, so that the efficiency is lower compared with the efficiency of the LLC resonant conversion technology.
The primary side of the embodiment adopts an LLC resonance transformation scheme, and the switching tube works at zero voltage and has small loss; if the efficiency requirement is not high, the output rectification can also select a Schottky diode, and if the efficiency is pursued to be higher, the MOSFET synchronous rectification is adopted.
Fig. 4 shows that the output current value of two star LLC resonances after the same-direction coupling of the resonant inductors in the same-phase bridge arm is verified to be significantly improved when the resonant parameter deviates from the center value, and it can be seen from fig. 5 that the simulation result of this embodiment is: the first star LLC resonance output current is about 460A, the second star LLC resonance output current is about 520A, and the reliability hidden danger caused by overlarge layout and wiring space hardly exists, so that the reliability is obviously improved.
In summary, the circuit of the embodiment adopts two star-type connection LLC resonant conversion circuits with alternately connected primary sides, 12 secondary sides alternately connected in parallel, and selects a magnetic core transformer, a primary side MOSFET and a synchronous rectification MOSFET with lower loss, the conversion efficiency can reach 99% or more, and at the same time, the bottleneck in the current technology of outputting low voltage and large current is solved, a digital control technology is required in control, and a suitable digital signal processing chip is adopted, so that the control and processing are flexible; the output current pulsation is greatly reduced, the capacitance volume is greatly reduced, and the cost is reduced, so that the low-voltage high-current power supply device with lower cost, high efficiency, high power density and high reliability is realized, and the realization of batch production is facilitated.
The above description is only an exemplary embodiment of the present invention, and the first to sixth primary side input circuits may be connected in series by connecting the primary side inputs of the two star-shaped connections to +400VDC and-400 VDC, respectively, and the scope of the present invention is not limited to the above-described embodiment. It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by hardware instructions of a computer program, which may be stored in a Digital Signal Processing (DSP) chip or a non-volatile computer readable storage medium, and when executed, the computer program may include the processes of the above embodiments of the methods. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An inductance same-direction coupling high-frequency star LLC resonance conversion device is characterized by comprising: the primary side input circuit is connected with the secondary side output circuit through a transformer;
the primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group;
two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit connected in a high-frequency star manner; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; the LLC resonant circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit connected in a high-frequency star shape, the terminating ends of primary windings of the transformers in the LLC resonant circuit are connected to form a star-shaped connection point;
the secondary output circuit comprises an LLC resonance output circuit which is connected by two or more high-frequency star circuits, the LLC resonance output circuit which is connected by the high-frequency star circuits comprises two or more LLC resonance output circuits, the LLC resonance output circuit comprises the secondary output circuit of the transformer, and the secondary output circuit of the transformer comprises: the secondary side of each transformer is connected with the output control and then connected to the half-wave power supply rectification output end.
2. The inductance co-rotating coupling high frequency star LLC resonant conversion device of claim 1, wherein primary sides of said transformers in said primary side input circuit are connected in parallel, and secondary sides of said transformers in said secondary side output circuit are connected in parallel.
3. The inductively co-coupled high frequency star LLC resonant conversion device of claim 1, wherein the drive signals for the upper and lower legs of each leg are 180 degrees apart in said primary input circuit.
4. The inductively co-coupled high frequency star LLC resonant conversion device of claim 1, wherein in said primary input circuit, the drive signals between different legs are 120 degrees out of phase.
5. The inductively co-coupled high frequency star LLC resonant conversion device of claim 1, wherein the secondary side of each transformer is a half-wave rectified output circuit.
6. The inductive homodromous coupling high-frequency star LLC resonant conversion device according to claim 1, wherein said output control is an output diode or an MOS transistor.
7. The inductance same-direction coupling high-frequency star LLC resonant conversion device according to claim 1, wherein said primary side input circuit comprises 6 said LLC resonant circuits, and said secondary side output circuit comprises 6 said LLC resonant output circuits.
8. The inductance co-directional coupling high-frequency star LLC resonant conversion device according to claim 7, wherein 6 bridge arms of 6 paths of LLC resonant circuits in the primary side input circuit are divided into two groups of star connection bridge arm groups, and the switch driving signals of 3 bridge arms in the star connection bridge arm groups are the same in phase with respect to the driving signals of the other group of 3 bridge arms.
9. The inductively co-coupled high frequency star LLC resonant conversion apparatus of claim 8, wherein in said star connected set of arms, each pair of switch drive signals are co-coupled with the corresponding connected resonant inductors of the same phase arm.
10. A control method of an inductance same-direction coupling high-frequency star LLC resonant conversion device is characterized by comprising the following steps:
the input voltage is input at the input end of a primary side input circuit, the primary side input circuit comprises more than or equal to two high-frequency star-connected LLC resonant circuits which are arranged in parallel, each high-frequency star-connected LLC resonant circuit comprises more than or equal to two LLC resonant circuits, and the corresponding LLC resonant circuits between the parallel high-frequency star-connected LLC resonant circuits form an LLC resonant circuit group;
two resonance switches of the LLC resonance circuit form a bridge arm of the LLC resonance circuit connected in a high-frequency star manner; bridge arms with switch driving signals in the same phase are arranged in the LLC resonant circuit group, and resonant inductors in each pair of bridge arms in the same phase are coupled in the same direction; the LLC resonant circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonant circuit connected in a high-frequency star shape, the terminating ends of primary windings of the transformers in the LLC resonant circuit are connected to form a star-shaped connection point;
the input voltage passes through the primary side of the transformer in the LLC resonant circuit in the high-frequency star connection, and enters a secondary side output circuit after being converted by the transformer; the secondary output circuit comprises an LLC resonance output circuit which is connected by two or more high-frequency star circuits, the LLC resonance output circuit which is connected by the high-frequency star circuits comprises two or more LLC resonance output circuits, the LLC resonance output circuit comprises the secondary output circuit of the transformer, and the secondary output circuit of the transformer comprises: the secondary side of each transformer is connected with the output control and then connected to the half-wave power supply rectification output end;
and current sharing is output through the power supply half-wave rectification output end in the secondary side output circuit.
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