CN115580150A - Three-phase staggered wide-range efficient isolation bidirectional converter - Google Patents
Three-phase staggered wide-range efficient isolation bidirectional converter Download PDFInfo
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- CN115580150A CN115580150A CN202211104680.2A CN202211104680A CN115580150A CN 115580150 A CN115580150 A CN 115580150A CN 202211104680 A CN202211104680 A CN 202211104680A CN 115580150 A CN115580150 A CN 115580150A
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M3/01—Resonant DC/DC converters
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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 three-phase staggered wide-range efficient isolation bidirectional converter which comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein the resonant cavity comprises three resonant circuits, each resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of each first inductor is connected with one end of each second inductor, one end of each first capacitor and one end of each third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one end of each third inductor and one end of each second capacitor, one end of each third inductor is connected with the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of one transformer, the ends of the second capacitors in the three resonant circuits, which are connected with the first capacitors, are respectively connected with each other to form Y-shaped connection, and secondary windings of the three transformers are respectively connected with the midpoints of three bridge arms of the three-phase bridge type rectifying circuit.
Description
Technical Field
The invention relates to the technical field of power conversion, in particular to a three-phase staggered wide-range efficient isolation bidirectional converter.
Background
The DC-DC bidirectional converter is a DC/DC converter capable of adjusting energy bidirectional transmission according to requirements, is mainly applied to occasions such as an energy storage system, a vehicle-mounted power supply system, a feedback charging and discharging system, a hybrid energy electric vehicle and the like, and with continuous development of the industry, the power is continuously improved from kilowatt level to dozens of kilowatt level, so that the topology of high power, wide range, positive and negative symmetry and bidirectional and high efficiency is realized, and the trend is great.
In the traditional LLC resonant bidirectional converter, ZVS (zero voltage switching) conduction of a switching tube at the primary side and ZCS (zero voltage switching) conduction of a diode at the rectifying side can be realized no matter in forward and reverse work, but when energy flows reversely, the circuit characteristic is not the LLC resonant characteristic any more and is degraded into LC resonant characteristic, the maximum voltage gain of LC resonance is changed into 1, the voltage gain in reverse work is greatly reduced, reverse normal output cannot be realized, and therefore the forward and reverse completely symmetrical bidirectional cannot be realized; in order to realize fully symmetrical bidirectional energy flow, a DAB (digital audio broadcasting) topology circuit or a one-level topology circuit added on the basis of an LLC (logical link control) circuit is adopted in the industry to make up the problem of insufficient LLC (logical link control) reverse gain capacity, and fully symmetrical bidirectional energy flow is basically realized, but the problems of low efficiency are caused by a DAB hard switch and an LLC two-level topology framework, particularly for a higher-power bidirectional DC-DC, the heat and ripple of the high-power bidirectional DC-DC become more and more difficult to process due to the intrinsic problems of the DAB topology or the two-level topology after the power is continuously increased, and finally become a bottleneck.
Disclosure of Invention
The invention aims to provide a three-phase staggered wide-range high-efficiency isolated bidirectional converter which can reduce ripples and simultaneously realize wide range, complete symmetry of positive and negative gains and high efficiency.
In order to solve the technical problems, the invention provides a three-phase interleaved wide-range efficient isolation bidirectional converter, which comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the third inductor is connected to the middle point of a bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the second capacitor and the first capacitor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of secondary windings of the three transformers are respectively correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit, and the heteronymous ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
The further technical scheme is as follows: the three-phase bridge type switching circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as the first connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
The further technical scheme is as follows: the three-phase bridge type rectifying circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as second connecting sides of the three-phase staggered wide-range efficient isolation bidirectional converter after being connected in parallel.
The further technical scheme is as follows: the switch tube is a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
The further technical scheme is as follows: the three-phase alternating wide-range efficient isolation bidirectional converter further comprises a first filter capacitor and a second filter capacitor, two ends of the first filter capacitor are connected to a first connecting side of the three-phase alternating wide-range efficient isolation bidirectional converter, and two ends of the second filter capacitor are connected to a second connecting side.
In order to solve the above technical problems, the present invention further provides a three-phase interleaved wide-range high-efficiency isolated bidirectional converter, comprising a three-phase bridge switching circuit, a resonant cavity, three transformers and a three-phase bridge rectifying circuit, wherein one side of the three-phase bridge switching circuit and one side of the three-phase bridge rectifying circuit are respectively used as a first connection side and a second connection side of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter, the resonant cavity comprises three resonant circuits, and the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit and primary windings of the three transformers,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the second capacitor is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the third inductor and the first inductor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the synonym ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
In order to solve the technical problems, the invention also provides a three-phase interleaved wide-range high-efficiency isolation bidirectional converter, which comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor and one end of the second inductor are connected with one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is connected with one end of the third inductor and is connected to the middle point of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the third inductor, the other ends of the first capacitor in the three resonant circuits are connected with each other to form Y-shaped connection, the dotted ends of secondary windings of the three transformers are correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit respectively, and the dotted ends of secondary windings of the three transformers are connected with each other to form Y-shaped connection.
In order to solve the technical problems, the invention also provides a three-phase interleaved wide-range high-efficiency isolation bidirectional converter, which comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the first capacitor and the third inductor, one end of the second inductor is connected with the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected with the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the first inductor, the dotted ends of secondary windings of the three transformers are respectively and correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the dotted ends of the primary windings and the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
Compared with the prior art, each circuit in the three-phase interleaved wide-range efficient isolation bidirectional converter can reduce ripples by adopting a three-phase interleaving technology, equivalent circuits of the resonant circuits are all multi-element resonant circuits when energy flows in the forward direction and the reverse direction, soft switching is realized during forward and reverse operation, the loss is small, and the problem that the traditional LLC resonant circuit cannot work with the same reverse performance is solved.
Drawings
Fig. 1 is a circuit schematic diagram of a first embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Fig. 2 is a circuit schematic diagram of a second embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Fig. 3 is a circuit schematic diagram of a third embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Fig. 4 is a circuit schematic diagram of a fourth embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a circuit diagram of a first embodiment of a three-phase interleaved wide range high efficiency isolated bi-directional converter 10 in accordance with the present invention. In the embodiment shown in the drawings, the three-phase interleaved wide-range efficient isolation bidirectional converter 10 includes a three-phase bridge switching circuit 100, a resonant cavity 200, three transformers and a three-phase bridge rectifying circuit 300, one side of the three-phase bridge switching circuit 100 and one side of the three-phase bridge rectifying circuit 300 are respectively used as a first connection side and a second connection side of the converter 10 to connect a power supply or a load, the resonant cavity 200 includes three resonant circuits, and the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit 100 and primary windings of the three transformers. The resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one end of the second inductor, one end of the first capacitor and one end of the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one end of the third inductor and one end of the second capacitor, one end of the third inductor is connected with the middle point of one bridge arm in the three-phase bridge type switching circuit 100, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the three resonant circuits, which are connected with the second capacitor and the first capacitor, are respectively connected with each other to form a Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively and correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit 300, and the heteronymous ends of the secondary windings of the three transformers are respectively connected with each other to form a Y-shaped connection. Preferably, the inductance of the first inductor and the inductance of the second inductor in the resonant circuit are the same, and the capacitance of the first capacitor and the capacitance of the third capacitor are the same. Understandably, the Y-type connection is adopted in the resonant circuits, the total current flowing into the midpoint of the Y-type connection is equal to the total current flowing out of the midpoint of the Y-type connection, namely the sum of the currents of the three resonant circuits is '0', so that the current of one resonant circuit is always the sum of the currents of the other two resonant circuits at any moment, and even if the resonant parameters of each resonant circuit have certain tolerance in the whole switching period, the effective current value deviation of the resonant circuits is small, so that the current balance among the three resonant circuits is ensured, and the phenomenon that the devices of the circuit are damaged or overheated due to the overlarge current of one resonant circuit is avoided.
Specifically, in this embodiment, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit and a third resonant circuit, the three transformers include a first transformer T1, a second transformer T2 and a third transformer T3, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, a second inductor L2 and a third inductor L3, the second resonant circuit includes a first capacitor C4, a second capacitor C5, a third capacitor C6, a first inductor L4, a second inductor L5 and a third inductor L6, the third resonant circuit includes a first capacitor C7, a second capacitor C8, a third capacitor C9, a first inductor L7, a second inductor L8 and a third inductor L9, in the embodiment shown in the drawings, the third inductor L3, the third inductor L6 and the third inductor L9 are respectively and correspondingly connected to middle points of three bridge arms of the bridge-type switching circuit 100, the second capacitor C2, the second inductor L5 and the third inductor L3 are respectively connected to a midpoint of a transformer T2, a second inductor L8 and a transformer T2; the third capacitor C3, the third capacitor C6 and the third capacitor C9 are respectively and correspondingly connected with the different name ends of the primary windings of the first transformer T1, the second transformer T2 and the third transformer T3.
In this embodiment, when energy flows in the forward direction, that is, energy flows from the first connection side to the second connection side, the first connection side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10 serves as a dc input end and can be connected with an external power supply, and the second connection side thereof serves as a dc output end and can be connected with an external load; when the energy flows in the reverse direction, i.e. the energy flows from the second connection side to the first connection side, the second connection side of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 is used as the dc input terminal, and the first connection side thereof is used as the dc output terminal. The three-phase interleaved wide-range efficient isolation bidirectional converter 10 is simple in structure, equivalent circuits of the resonant circuits are all multi-element resonant circuits when energy flows in the forward direction and the reverse direction, soft switching can be achieved when the energy flows in the forward direction and the reverse direction, loss is small, the problem that reverse gain of a traditional LLC resonant circuit is insufficient is solved, namely, the voltage can be raised when the energy flows from the second connecting side to the first connecting side, the input and output voltage range of the converter 10 can be effectively improved, input and output in a wide voltage range are achieved, and the three-phase interleaved wide-range efficient isolation bidirectional converter 10 is applicable to a high-power circuit; compared with the prior art that the switching frequency of the three-phase interleaved bidirectional converter needs broadband control to realize wide-range input and output of voltage, the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 has the advantages that the resonance frequency of the resonance circuit is low, and the wide-range output of voltage can be realized without broadband control when the switching frequency modulation control is adopted, namely, the switching control frequency can be compressed and narrowed, so that the efficiency is improved.
In some embodiments, the three-phase bridge switching circuit 100 includes six switching tubes, namely a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6, each two switching tubes are connected in series to form a bridge arm, and after three bridge arms are connected in parallel, two ends of each three bridge arm are used as a first connection side of the three-phase interleaved wide-range efficient isolated bidirectional converter 10, wherein a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected to the first resonant circuit, a midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected to the second resonant circuit, and a midpoint of a bridge arm formed by connecting the fifth switching tube Q5 and the sixth switching tube Q6 in series is connected to the third resonant circuit. In this embodiment, a PFM mode is used to control the operation of the switching tube, that is, a constant duty ratio is used to control the on and off time of the switching tube, and then the adjustment is realized by modulating the square wave frequency, the switching frequency of the three-phase interleaved bidirectional converter in the prior art needs to be controlled in a wide frequency range to realize the wide-range voltage input and output, that is, when 40v needs to be boosted to 400v, the switching frequency needs to be fully loaded, the frequency is as high as 200KHZ when fully loaded, and the frequency is as high as 250KHZ when no load, but the control range of the switching frequency of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 of the present invention is relatively small, and the switching frequency is only 160KHZ when fully loaded, and the efficiency is high when the boost gain is the same.
In the embodiment shown in the drawings, the three-phase bridge rectifier circuit 300 includes six switching tubes, namely a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11 and a twelfth switching tube Q12, each two switching tubes are connected in series to form a bridge arm, and two ends of each three bridge arms are used as the second connection side of the three-phase interleaved wide-range efficient isolation bidirectional converter 10 after being connected in parallel, wherein a midpoint of a bridge arm formed by connecting the seventh switching tube Q7 and the eighth switching tube Q8 in series is connected with the secondary winding of the first transformer T1, a midpoint of a bridge arm formed by connecting the ninth switching tube Q9 and the tenth switching tube Q10 in series is connected with the secondary winding of the second transformer T2, and a midpoint of a bridge arm formed by connecting the eleventh switching tube Q11 and the twelfth switching tube Q12 in series is connected with the secondary winding of the third transformer T3. Based on the design, when energy flows in the forward direction, the three-phase bridge rectifier circuit 300 can rectify the voltage waveform periodically output by the transformer to generate the working voltage required by the load. Preferably, the switch tube can be selected from a MOSFET, an IGBT tube, a GaN tube, a SiC power tube or other controllable power switch tubes to achieve better circuit performance, and in some other embodiments, a diode can be connected in parallel to each switch tube.
Further, the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10 further includes a first filter capacitor C10 and a second filter capacitor C11, two ends of the first filter capacitor C10 are connected to the first connection side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10, and two ends of the second filter capacitor C11 are connected to the second connection side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10.
Understandably, in this embodiment, when energy is transmitted in the forward direction, the wide-range voltage output of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 is realized by controlling the switching frequencies of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6, and the two switching tubes on each bridge arm are complementarily turned on, so that the circuit soft switching can be realized; when energy is transmitted reversely, an equivalent circuit of the resonant circuit is also a multi-element resonant circuit, so that the same wide-range voltage output as that during forward transmission can be realized by controlling the switching frequencies of the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12, and the two switching tubes on each bridge arm are complementarily conducted, so that soft switching of the circuit can be realized.
The three-phase interleaved wide-range efficient isolation bidirectional converter 10 adopts a three-phase interleaving technology, the conduction phase difference of Q1 and Q2, Q3 and Q4, and the conduction phase difference of Q5 and Q6 are all 180 degrees, and the conduction time sequences of Q1, Q3 and Q5 are mutually different by 120 degrees; therefore, the conduction time sequences of Q2, Q4 and Q6 are different by 120 degrees, the phase difference of the three-phase input and output currents is 120 degrees, the input and output current fluctuation of the three-phase circuit is complementary, the input and output current ripple is small, and good circuit performance is achieved. At any moment, at least one of Q1, Q3 and Q5 is conducted at most two, and at least one of Q2, Q4 and Q6 is conducted at most two, and the number of the conducted switching tubes is equal to three all the time. Taking one of the three resonant circuits as an example, when Q1, Q4 and Q6 are turned on, the resonant dc voltage is transmitted to the first transformer T1 through the first switching tube Q1, and meanwhile, the current value of the first resonant circuit is increased to store energy, and meanwhile, the seventh switching tube Q7 is turned on, and the second filter capacitor C11 is used for rectifying and filtering the output voltage of the first transformer T1 to output a stable voltage and control the output current; when Q2, Q3 and Q5 switch on, resonance direct current reverse voltage conveys to first transformer T1 through second switch tube Q2, and the reverse current value of first resonant circuit increases simultaneously, supplies power to first transformer T1, and eighth switch tube Q8 switches on, realizes rectifying, filtering to the output voltage of first transformer T1 to output stable voltage, control output current. Similarly, the working principle of the other two resonant circuits is consistent with the circuit.
Referring to fig. 2, fig. 2 is a circuit diagram of a second embodiment of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 of the present invention, which is different from the first embodiment in the specific connections of the resonant circuit, the inverter circuit and the transformer in the resonant cavity 200, and the rest of the circuit structures are the same or similar. In this embodiment, a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected to a second capacitor C2 in the first resonant circuit, a midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected to a second capacitor C5 in the second resonant circuit, a midpoint of a bridge arm formed by connecting the fifth switching tube Q5 and the sixth switching tube Q6 in series is connected to a second capacitor C8 in the third resonant circuit, the third inductor L3, the third inductor L6 and the third inductor L9 are respectively connected to each other to form a Y-type connection, and the third capacitor C3, the third capacitor C6 and the third capacitor C9 are respectively and correspondingly connected to corresponding terminals of primary windings of the first transformer T1, the second transformer T2 and the third transformer T3; the second inductor L2, the second inductor L5 and the second inductor L8 are respectively connected to the different-name terminals of the primary windings of the first transformer T1, the second transformer T2 and the third transformer T3.
Referring to fig. 3, fig. 3 is a circuit diagram of a third embodiment of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 of the present invention, which is different from the first embodiment in that the specific structure of the resonant circuit in the resonant cavity 200 is different, and the rest of the circuit structures are the same or similar. In this embodiment, the resonant circuit includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a third inductor, one end of each of the first inductor and the second inductor is connected to one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is connected to one end of the third inductor and is connected to a midpoint of a bridge arm in the three-phase bridge switch circuit, the other ends of the second inductor and the second capacitor are connected to a primary winding of a transformer, the other end of the second inductor is connected to the other end of the third inductor, and the other ends of the first capacitors in the three resonant circuits are connected to each other to form a Y-type connection.
As can be seen from the figure, specifically, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit and a third resonant circuit, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2 and a third inductor L3, the second resonant circuit includes a first capacitor C3, a second capacitor C4, a first inductor L4, a second inductor L5 and a third inductor L6, the third resonant circuit includes a first capacitor C5, a second capacitor C6, a first inductor L7, a second inductor L8 and a third inductor L9, in the embodiment shown in the drawings, one end of each of the third inductor L3, the third inductor L6 and the third inductor L9 is correspondingly connected to a midpoint of three bridge arms of the three-phase bridge type switching circuit 100, the other end of each of the third inductor L3, the third inductor L6 and the third inductor L9 is correspondingly connected to a middle point of a same bridge arm of the first transformer T1, the second transformer T2 and the same bridge type transformer T3, the second capacitor C1, the second inductor L5 and the third inductor L6, and the other end of the same bridge type transformer T1 are correspondingly connected to a primary winding of the first capacitor C1, the second capacitor C4, the third inductor L6, and the third capacitor C3. The present embodiment can also effectively increase the input/output voltage range of the converter 10, and realize wide voltage range input/output, and when the switching frequency modulation control is adopted, the wide voltage range output can be realized without wide frequency control, i.e. the switching frequency can be compressed and narrowed, and the efficiency is improved.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a fourth embodiment of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter 10 of the present invention, which is different from the first embodiment in that the specific structure of the resonant circuit in the resonant cavity 200 is different, and the rest of the circuit structures are the same or similar. In this embodiment, the resonant circuit includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a third inductor, one end of the first inductor is connected to one ends of the first capacitor and the third inductor, one end of the second inductor is connected to the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected to a midpoint of a bridge arm in the three-phase bridge switching circuit, the other ends of the second inductor and the second capacitor are connected to a primary winding of a transformer, and the other end of the second inductor is connected to the other end of the first inductor.
As can be seen from the figure, specifically, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit, and a third resonant circuit, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2, and a third inductor L3, the second resonant circuit includes a first capacitor C3, a second capacitor C4, a first inductor L4, a second inductor L5, and a third inductor L6, the third resonant circuit includes a first capacitor C5, a second capacitor C6, a first inductor L7, a second inductor L8, and a third inductor L9, in the embodiment shown in the drawing, the first capacitor C1, the first capacitor C3, and the first capacitor C5 are respectively connected to middle points of three bridge arms of the three-phase bridge switch circuit 100, the second capacitor C2, the second capacitor C4, and the second capacitor C6 are respectively connected to corresponding ends of primary windings of a first transformer T1, a second transformer T2, and a third transformer T3, the second capacitor C2, the second inductor L4, and the second capacitor C6 are respectively connected to corresponding ends of a primary winding T1, a secondary winding of the first transformer T2, a secondary winding of the second transformer T2, a secondary winding of the third transformer T3, and a secondary winding of the transformer T2, a secondary winding of the third transformer T3, which are connected to a primary winding of the transformer T2, and a primary winding of the transformer.
In summary, each circuit in the three-phase interleaved wide-range efficient isolation bidirectional converter of the invention can reduce ripples by adopting a three-phase interleaving technology, and equivalent circuits of the resonant circuits in the three-phase interleaved wide-range efficient isolation bidirectional converter are all multi-element resonant circuits when energy flows in the forward and reverse directions, soft switching is realized during forward and reverse working, the loss is small, and the problem that the traditional LLC resonant circuit cannot work with reverse equivalent performance is solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (8)
1. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, and the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and the primary windings of the three transformers,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the third inductor is connected to the middle point of a bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the second capacitor and the first capacitor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of secondary windings of the three transformers are respectively correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit, and the heteronymous ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
2. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase bridge type switching circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as the first connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
3. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase bridge type rectifying circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as second connecting sides of the three-phase staggered wide-range efficient isolation bidirectional converter after being connected in parallel.
4. A three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 2 or 3 wherein: the switch tube is selected from a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
5. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase alternating wide-range efficient isolation bidirectional converter further comprises a first filter capacitor and a second filter capacitor, two ends of the first filter capacitor are connected to a first connecting side of the three-phase alternating wide-range efficient isolation bidirectional converter, and two ends of the second filter capacitor are connected to a second connecting side.
6. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, and the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and the primary windings of the three transformers,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the second capacitor is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the third inductor and the first inductor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the synonym ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
7. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor and one end of the second inductor are connected with one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is connected with one end of the third inductor and is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the third inductor, the other ends of the first capacitors in the three resonant circuits are connected with each other to form Y-shaped connection, the dotted ends of secondary windings of the three transformers are correspondingly connected with the midpoint of three bridge arms of the three-phase bridge type rectifying circuit respectively, and the dotted ends of secondary windings of the three transformers are connected with each other to form Y-shaped connection respectively.
8. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the first capacitor and the third inductor, one end of the second inductor is connected with the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected with the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the first inductor, the dotted ends of secondary windings of the three transformers are respectively and correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the dotted ends of the primary windings and the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
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| CN202211104680.2A CN115580150A (en) | 2022-09-09 | 2022-09-09 | Three-phase staggered wide-range efficient isolation bidirectional converter |
| PCT/CN2023/104672 WO2024051317A1 (en) | 2022-09-09 | 2023-06-30 | Three-phase-interleaving extended-range efficient-isolation bidirectional converter |
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| CN202211104680.2A CN115580150A (en) | 2022-09-09 | 2022-09-09 | Three-phase staggered wide-range efficient isolation bidirectional converter |
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| WO2024051317A1 (en) * | 2022-09-09 | 2024-03-14 | 深圳深源技术能源有限公司 | Three-phase-interleaving extended-range efficient-isolation bidirectional converter |
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| US7742318B2 (en) * | 2008-06-10 | 2010-06-22 | Virginia Tech Intellectual Properties, Inc. | Multi-element resonant converters |
| CN105024551A (en) * | 2014-04-16 | 2015-11-04 | 艾默生网络能源有限公司 | Resonance circuit, charger and uninterrupted power supply |
| CN109217681B (en) * | 2018-11-26 | 2021-01-26 | 燕山大学 | Bidirectional resonant converter |
| CN109560711B (en) * | 2019-01-22 | 2020-02-11 | 山东大学 | Isolated bidirectional DC-DC converter and modulation method thereof |
| CN212343653U (en) * | 2020-02-27 | 2021-01-12 | 西安图为软件科技有限公司 | Resonant circuit and bidirectional resonant circuit converter |
| CN114157150B (en) * | 2021-10-27 | 2024-01-05 | 深圳市崧盛电子股份有限公司 | High-gain bidirectional Y source-LLC isolated DC-DC converter |
| CN114884365A (en) * | 2022-05-18 | 2022-08-09 | 深圳深源技术能源有限公司 | Three-phase converter |
| CN114900048A (en) * | 2022-05-18 | 2022-08-12 | 深圳深源技术能源有限公司 | Three-phase bidirectional DC-DC converter |
| CN115580150A (en) * | 2022-09-09 | 2023-01-06 | 深圳深源技术能源有限公司 | Three-phase staggered wide-range efficient isolation bidirectional converter |
| CN218549757U (en) * | 2022-09-09 | 2023-02-28 | 深圳深源技术能源有限公司 | Three-phase staggered wide-range efficient isolation bidirectional converter |
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| WO2024051317A1 (en) * | 2022-09-09 | 2024-03-14 | 深圳深源技术能源有限公司 | Three-phase-interleaving extended-range efficient-isolation bidirectional converter |
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