CN111313710A - Self-current-sharing high-frequency star LLC resonance combined conversion device and control method thereof - Google Patents
Self-current-sharing high-frequency star LLC resonance combined 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 a self-current-sharing high-frequency star LLC resonance combined conversion device and a control method thereof, wherein the device comprises a primary side input circuit and a secondary side output circuit, wherein 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, and the high-frequency star-connected LLC resonant circuits comprise more than or equal to two LLC resonant circuits; and the secondary side output circuit comprises more than or equal to two high-frequency star-connected LLC resonant output circuits, and the high-frequency star-connected LLC resonant output circuits comprise more than or equal to two LLC resonant output circuits. The invention realizes the current sharing function of instantaneous current and average current in two high-frequency star LLC resonant conversions and achieves the effect of self current sharing.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a self-current-sharing high-frequency star LLC resonance combined 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 a self-current-sharing high-frequency star LLC resonant combined 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 a self-current-sharing high-frequency star LLC resonance combined conversion device, which comprises: 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, the high-frequency star-connected LLC resonant circuits comprise more than or equal to two LLC resonant circuits, and the LLC resonant circuits comprise: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series 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 a high-frequency star and is more than or equal to two paths, the LLC resonance output circuit which is connected by the high-frequency star comprises an LLC resonance output circuit which is more than or equal to two paths, the LLC resonance output circuit comprises two transformer secondary output circuits of a series transformer, and the transformer secondary output circuit comprises: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end.
Optionally, the primary sides of the series transformers in the primary side input circuit are connected in parallel, and the secondary sides of the single transformer in the secondary side output circuit are connected in parallel.
Optionally, two resonant switches of the LLC resonant circuit form arms of the high-frequency star-connected LLC resonant circuit, and in the primary-side input circuit, driving signals of upper and lower tubes of each arm differ by 180 degrees.
Optionally, two resonant switches of the LLC resonant circuit form arms of the high-frequency star-connected LLC resonant circuit, and in the primary-side input circuit, phases of drive signals between different arms differ by 120 degrees.
Optionally, the secondary side of each transformer is a full-bridge 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 group, secondary sides of the series transformers corresponding to the same-phase bridge arms of each pair of switch driving signals are connected in series in a crossing manner.
On the other hand, the invention also provides a control method of the self-current-sharing high-frequency star LLC resonance combined conversion device, which comprises the following steps:
carry out input voltage at the input of former limit input circuit, former limit input circuit includes the LLC resonant circuit of the high frequency star connection that is greater than or equal to two ways, the LLC resonant circuit of high frequency star connection includes the LLC resonant circuit that is greater than or equal to two ways, the LLC resonant circuit includes: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series 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 series 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 a high-frequency star and is more than or equal to two paths, the LLC resonance output circuit which is connected by the high-frequency star comprises an LLC resonance output circuit which is more than or equal to two paths, the LLC resonance output circuit comprises two transformer secondary output circuits of a series transformer, and the transformer secondary output circuit comprises: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end;
and the current of the current sharing is output through the power supply rectification output end in the secondary side output circuit.
The self-current-sharing high-frequency star LLC resonant combined conversion device and the control method thereof adopt the LLC resonant converter to realize ZVS and controllable turn-off current in the full load range of a switching tube, and achieve zero current turn-off (ZCS) approximation, and the secondary side adopts diode rectification or synchronous rectification, and because the diode does not have reverse recovery, the loss caused by the diode can be reduced, and the conversion efficiency is greatly improved.
In the mode that the secondary sides of two transformers connected in series in the same-phase bridge arm in two high-frequency star LLC resonant conversions are in cross series connection, when the deviation of the resonant inductance in the first star LLC resonant conversion is + 5% and the deviation of the resonant capacitance is + 5%, the deviation of the resonant inductance in the second star LLC resonant conversion is-5% and the deviation of the resonant capacitance is-5%, the instantaneous waveform of the output current of the second star LLC resonant conversion is the same as that of the output current of the first star LLC resonant conversion, so that the current equalizing function of the instantaneous current and the average current in the two high-frequency star LLC resonant conversions is well realized, and the self-current equalizing effect is achieved.
The two star LLC resonant conversions realize good current sharing, reduce the total loss and reduce the voltage and current stress, thereby reducing the power capacity and the current capacity of the selected power tube and reducing the cost; the thermal stress of the switch tube, the main transformer and the resonant inductor is reduced, and the reliability is improved. .
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 diagram of a self-current-sharing high-frequency star LLC resonant combined conversion apparatus according to an embodiment of the present invention;
FIG. 5 is a graph showing the simulation effect of the output current of the high-frequency star LLC resonant conversion parallel circuit with good self-current sharing when the resonant capacitance parameter is also deviated from the central value in the embodiment of the invention;
fig. 6 is a flowchart illustrating steps of a control method of a self-current-sharing high-frequency star LLC resonant combined 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 (direct current/direct current) conversion in the conventional switching power supply usually adopts a phase-shifted full-bridge technology, which is a mature soft switching technology, and the so-called phase-shifted control method is that switches S1 and S2 are alternately turned on, each being turned on by 180 electrical degrees, as well as switches S3 and S4. However, S1 (or S2) and S4 (or S3) are not simultaneously turned on, but 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 output rectifier diode has reverse recovery loss, so that the conversion efficiency is influenced, the output needs larger-volume inductance L filtering, the cost is increased, and the size of the converter is influenced.
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 diagram showing simulation effects of output currents after resonance parameters of two high-frequency star LLC resonant conversion parallel circuits deviate from a central value, when a resonance inductance deviation central value in a first star resonant conversion is + 5%, and a resonance capacitance deviation central value is + 5%, a resonance inductance deviation central value in a second star resonant conversion is-5%, and a resonance capacitance deviation central value is-5%, an output current of the second star resonant conversion is about 38% larger than an output current of the first resonant conversion, the first star LLC resonant output current is about 420A, and the second star LLC resonant output current is about 580A; the difference between the two is large, which causes the difference between the loss of the two high-frequency resonance transformation power switching tubes, the loss of the diode resonance inductor and the loss of the main transformer to be increased, and further easily causes the electrical stress or the thermal stress to exceed the design requirement, so that the potential reliability hazard exists.
Therefore, this embodiment provides a self-current-sharing high-frequency star LLC resonant combined conversion apparatus, which includes: the primary side input circuit is connected with the secondary side output circuit through a transformer; former limit input circuit, including the LLC resonant circuit that is greater than or equal to two ways high frequency star connection, the LLC resonant circuit that the high frequency star is connected, including the LLC resonant circuit that is greater than or equal to two ways, LLC resonant circuit includes: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series transformers in the LLC resonant circuit are connected to form a star connection point.
Secondary 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 connects, including the LLC resonance output circuit that is greater than or equal to two ways, LLC resonance output circuit, including two secondary limit output circuit of transformer of series connection transformer, the secondary limit output circuit of transformer includes: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end.
Alternatively, the primary sides of the series transformers in the primary side input circuit are connected in parallel, and the secondary sides of the individual transformers in the secondary side output circuit are connected in parallel.
Optionally, two resonant switches of the LLC resonant circuit form arms of the LLC resonant circuit in a high-frequency star connection, and in the primary input circuit, the driving signals of the upper and lower tubes of each arm differ by 180 degrees, and the driving signals between different arms differ by 120 degrees in phase.
Optionally, the secondary side of each transformer is a full-bridge rectified output circuit. The output control component can be an output diode (as shown in fig. 4) or a MOS transistor.
The circuit structure schematic diagram is shown in fig. 4, and the power circuit is described by taking a power circuit which integrally comprises 6 paths of primary side input and 6 paths of secondary side output from top to bottom, taking a power circuit which is suitable for input voltage of positive 400VDC and has 20VDC/1000A output as an example, the power circuit integrally comprises 6 paths of LLC resonant primary side input circuits and 6 paths of LLC resonant circuit secondary side output circuits from top to bottom, the primary side is an LLC resonant circuit in a high-frequency star connection mode, and one primary side input circuit corresponds to one coupled secondary side output circuit; each primary side input circuit comprises two switches, an inductor, a resonant capacitor and a primary side of two transformers which are connected in series; each secondary side output circuit comprises two transformer secondary sides of the transformer which are connected in series, four output diodes or four MOS (metal oxide semiconductor) tubes. Fig. 5 is a diagram of simulation effect of output current of the high-frequency star LLC resonant conversion parallel circuit with good self-current sharing in this embodiment when the resonant capacitance parameter is also deviated from the central value.
Specifically, the input voltage Vi is respectively connected to 6 primary side input circuits, the first primary side input circuit includes 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 to one end of a first resonant inductor L1, the other end of the first resonant inductor L1 is connected to a first resonant capacitor C1, the other end of the first resonant capacitor C1 is connected to one end of a primary side winding of a first transformer T1, the other end of the primary side winding of the first transformer T1 is connected to one end of 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 to one end of a primary side winding of a fourth transformer T4 and one end of a primary side winding of a sixth transformer T6, so as to form a first star connection point; the first secondary output circuit is formed by connecting the secondary side of the first transformer T1 and the secondary side of the eighth transformer T8 in series, and the secondary side needs to keep the corresponding relation with the same-name end of the primary side; the first diode D1, the second diode D2, the fifteenth diode D15 and the sixteenth diode D16 are connected to two ends of the rectifier circuit after series connection to form a full-bridge rectifier 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 one end of a second resonant inductor L2, the other end of the second resonant inductor L2 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 third transformer T3, the other end of the primary side winding of the third transformer T3 is connected with one end of 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 the primary side winding of the second transformer T2 and one end of the primary side winding of a sixth transformer T6 to form a first star-shaped connection point; the second secondary output circuit is a full-bridge rectification circuit formed by connecting the secondary side of the third transformer T3 and the secondary side of the tenth transformer T10 in series, wherein the secondary side needs to keep the corresponding relation with the same-name end of the primary side, and the two ends of the series connection are connected with a fifth diode D5, a sixth diode D6, a nineteenth diode D19 and a twentieth diode D20.
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 end of a third resonant inductor L3, the other end of the third resonant inductor L3 is connected with a third resonant capacitor C3, the other end of the third resonant capacitor C3 is connected with a primary winding of a fifth transformer T5, the other end of the primary winding of the fifth transformer T5 is connected with one end of a primary winding of a sixth transformer T6, and the other end of the primary winding of the sixth transformer T6 is connected with one end of a primary winding of a second transformer T2 and one end of a primary winding of a fourth transformer T4 to form a first star-shaped connection point; the third secondary output circuit is a full-bridge rectification circuit formed by connecting the secondary side of a fifth transformer T5 and the secondary side of a twelfth transformer T12 in series, wherein the secondary side needs to keep the corresponding relation with the same-name end of the primary side, and the two ends of the series are connected with a ninth diode D9, a twelfth diode D10, a twenty-third diode D23 and a twenty-fourth diode D24.
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 one end of a fourth resonant inductor L4, the other end of the fourth resonant inductor L4 is connected with a fourth resonant capacitor C4, the other end of the fourth resonant capacitor C4 is connected with a primary winding of a seventh transformer T7, the other end of the primary winding of the seventh transformer T7 is connected with one end of the primary winding of an eighth transformer T8, and the other end of the primary winding of the eighth transformer T8 is connected with one end of the primary winding of a tenth transformer T10 and one end of the primary winding of a twelfth transformer T12 to form a second star-shaped connection point; the fourth secondary output circuit is a full-bridge rectification circuit formed by connecting the secondary side of the seventh transformer T7 and the secondary side of the second transformer T2 in series, wherein the secondary side needs to keep the corresponding relation with the same-name end of the primary side, and the two ends of the series connection are connected with a thirteenth diode D12, a fourteenth diode D14, a third diode D3 and a fourth diode D4.
The fifth primary 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 to one end of a fifth resonant inductor L5, the other end of the fifth resonant inductor L5 is connected to a fifth resonant capacitor C5, the other end of the fifth resonant capacitor C5 is connected to a primary winding of a ninth transformer T9, the other end of the primary winding of the ninth transformer T9 is connected to one end of the primary winding of a tenth transformer T10, and the other end of the primary winding of the tenth transformer T10 is connected to one end of the primary winding of an eighth transformer T8 and one end of the primary winding of a twelfth transformer T12, thereby forming a second star-shaped connection point; the fifth secondary output circuit is a full-bridge rectification circuit formed by connecting the secondary side of the ninth transformer T9 and the secondary side of the fourth transformer T4 in series, wherein the secondary side needs to keep the corresponding relation with the primary side at the same name end, and the two ends of the series connection are connected with a seventh diode D7, an eighth diode D8, a seventeenth diode D17 and an eighteenth diode D18.
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 to one end of a sixth resonant inductor L6, the other end of the sixth resonant inductor L6 is connected to a sixth resonant capacitor C6, the other end of the sixth resonant capacitor C6 is connected to a primary winding of an eleventh transformer T11, the other end of the primary winding of the eleventh transformer T11 is connected to one end of the primary winding of a twelfth transformer T12, and the other end of the primary winding of the twelfth transformer T12 is connected to one end of the primary winding of an eighth transformer T8 and one end of the primary winding of a tenth transformer T10, thereby forming a second star connection point; the sixth secondary output circuit is a full-bridge rectification circuit formed by connecting the secondary side of the eleventh transformer T11 and the secondary side of the sixth transformer T6 in series, wherein the secondary side needs to keep the corresponding relation with the same-name end of the primary side, and the two ends of the series connection are connected with an eleventh diode D11, a twelfth diode D12, a twenty-first diode D21 and a twenty-second diode D22.
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 a specific embodiment, the driving signals of the upper and lower tubes of the two bridge arms with different star LLC resonances, which are cross-connected by the secondary side of the transformer, are the same, or called 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 two star-connected primary sides of the first to sixth primary side input circuits are connected in parallel, and the first to sixth secondary side output circuits are connected in parallel after being rectified by a full bridge. The multi-path interleaving parallel connection is realized through the layout, the input voltage Vi is added to 6 primary side input circuits and then is rectified and parallel connected to the output voltage Vo through 12 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.
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 series transformers corresponding to the same phase bridge arm in each pair of switch driving signals are connected in series in a cross manner.
As shown in fig. 6, which is a schematic flow step diagram of a control method of a self current-sharing high-frequency star LLC resonant combined conversion apparatus in this embodiment, the control method can be implemented by the self current-sharing high-frequency star LLC resonant combined conversion apparatus, and specifically includes the following steps:
Former limit input circuit, including the LLC resonant circuit that is greater than or equal to two ways high frequency star connection, the LLC resonant circuit that the high frequency star is connected, including the LLC resonant circuit that is greater than or equal to two ways, LLC resonant circuit includes: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series transformers in the LLC resonant circuit are connected to form a star connection point.
And step 602, the input voltage passes through the primary side of a series transformer in the LLC resonant circuit in high-frequency star connection, and enters a secondary side output circuit after being converted by the transformer.
Secondary 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 connects, including the LLC resonance output circuit that is greater than or equal to two ways, LLC resonance output circuit, including two secondary limit output circuit of transformer of series connection transformer, the secondary limit output circuit of transformer includes: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end.
And 603, outputting the current of the current sharing through a power supply rectification output end in the secondary side output circuit.
Compared with the prior art, the scheme of the embodiment has high conversion efficiency, the ZVS of the full-load range switching tube cannot be realized by adopting the phase-shifted full-bridge technology, hard turn-off is realized, and reverse recovery exists in the secondary side rectifier diode, so that the efficiency is lower than that of the LLC resonant conversion technology.
The primary side of the embodiment adopts an LLC resonance transformation scheme, a primary side switching tube is switched on and off at zero voltage, the loss is small, when the deviation of resonance parameters of two star LLC resonance changes is large, the total loss is reduced by the self-current-sharing characteristic, and the efficiency is favorably and properly improved; 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 verifies that in the present embodiment, after the resonant inductors in the same-phase bridge arm are used for performing the homodromous coupling, the two star-type LLC resonant conversions are output in parallel, and when the resonant parameters of the two star-type LLC resonant conversions deviate from the central value, the difference of the output currents of the two star-type LLC resonances is substantially zero, and it can be seen from fig. 5 that the simulation result of this embodiment is: the waveforms of instantaneous values of the output currents of the two resonant conversions are completely overlapped, namely the waveforms are the same, so that the good current sharing performance of the instantaneous current and the average current is realized, the loss can be reduced, the efficiency is improved, the voltage current stress and the thermal stress are reduced, and the reliability is improved to a certain extent.
To sum up, the circuit of this embodiment adopts the mode of connecting in series the secondary in two transformers that are in series in the same phase bridge arm in two high frequency star LLC resonant transformation alternately, and two direct parallel DCDC transform structures of high frequency star LLC resonant transformation, and the resonant parameter of two star LLC resonant transformation is out of center value when two star LLC resonant transformation resonant current is basically no difference, and the output current instantaneous waveform of two star LLC resonant current coincides, realizes the current sharing performance of instantaneous current and average current well, can reduce the loss, promote efficiency, reduce voltage current stress and thermal stress, promote the reliability to a certain extent.
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. A self-current-sharing high-frequency star LLC resonance combined 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, the high-frequency star-connected LLC resonant circuits comprise more than or equal to two LLC resonant circuits, and the LLC resonant circuits comprise: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series 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 a high-frequency star and is more than or equal to two paths, the LLC resonance output circuit which is connected by the high-frequency star comprises an LLC resonance output circuit which is more than or equal to two paths, the LLC resonance output circuit comprises two transformer secondary output circuits of a series transformer, and the transformer secondary output circuit comprises: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end.
2. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein primary sides of said series transformers in said primary side input circuit are connected in parallel, and secondary sides of said single transformers in said secondary side output circuit are connected in parallel.
3. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein two resonant switches of the LLC resonant circuit form bridge arms of the high-frequency star-connected LLC resonant circuit, and in the primary side input circuit, driving signals of upper and lower tubes of each bridge arm are different by 180 degrees.
4. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein two resonant switches of the LLC resonant circuit form arms of the high-frequency star-connected LLC resonant circuit, and in the primary side input circuit, the phase difference of driving signals between different arms is 120 degrees.
5. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein the secondary side of each transformer is a full-bridge rectification output circuit.
6. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein the output control is an output diode or an MOS transistor.
7. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 1, wherein the primary side input circuit comprises 6 LLC resonant circuits, and the secondary side output circuit comprises 6 LLC resonant output circuits.
8. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 7, wherein 6 bridge arms of 6 paths of the LLC resonant circuits in the primary side input circuit are divided into two groups of star-connected bridge arm groups, and the switching drive signals of 3 bridge arms in the star-connected bridge arm groups are the same in phase with respect to the drive signals of the other group of 3 bridge arms.
9. The self-current-sharing high-frequency star LLC resonant combined conversion device according to claim 8, wherein in the star connection bridge arm set, secondary sides of the series transformers corresponding to the same phase bridge arms of each pair of switch driving signals are connected in series in a cross manner.
10. A control method of a self-current-sharing high-frequency star LLC resonant combined conversion device is characterized by comprising the following steps:
carry out input voltage at the input of former limit input circuit, former limit input circuit includes the LLC resonant circuit of the high frequency star connection that is greater than or equal to two ways, the LLC resonant circuit of high frequency star connection includes the LLC resonant circuit that is greater than or equal to two ways, the LLC resonant circuit includes: the primary sides of the two resonance switches, the coupling inductor, the resonance capacitor and the two series transformers are connected in series; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the series 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 series 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 series 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 a high-frequency star and is more than or equal to two paths, the LLC resonance output circuit which is connected by the high-frequency star comprises an LLC resonance output circuit which is more than or equal to two paths, the LLC resonance output circuit comprises two transformer secondary output circuits of a series transformer, and the transformer secondary output circuit comprises: the secondary side of the single transformer is connected with the output control and then connected to the power supply rectification output end;
and the current of the current sharing is output through the power supply rectification output end in the secondary side output circuit.
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| CN112908653A (en) * | 2021-02-02 | 2021-06-04 | 浙江工业大学之江学院 | Distributed transformer and application circuit thereof |
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