CN116131651A - Three-phase AC-DC bidirectional conversion circuit - Google Patents
Three-phase AC-DC bidirectional conversion circuit Download PDFInfo
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- CN116131651A CN116131651A CN202211104497.2A CN202211104497A CN116131651A CN 116131651 A CN116131651 A CN 116131651A CN 202211104497 A CN202211104497 A CN 202211104497A CN 116131651 A CN116131651 A CN 116131651A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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 AC-DC bidirectional conversion circuit, which comprises three-way boost circuits and one output capacitor circuit, wherein each boost circuit comprises an inductance circuit and a switch circuit, the inductance circuit comprises a first inductance and an auto-coupling inductance, the switch circuit comprises eight switch tubes and four diodes, each four switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then are connected with one side of the output capacitor circuit, each two diodes are connected in series and then are connected with two switches Guan Binglian positioned in the middle of one bridge arm, the homonymous end of a primary winding of the auto-coupling inductance and the homonymous end of a secondary winding of the auto-coupling inductance are connected with one end of the first inductance, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are respectively connected with the middle point of one bridge arm, the other side of the output capacitor circuit is used as a second external side of the three-phase AC-DC bidirectional conversion circuit, and the other end of the first inductance in the three-way boost circuit is used as a first external side of the three-phase AC-DC bidirectional conversion circuit.
Description
Technical Field
The invention relates to the technical field of power conversion, in particular to a three-phase AC-DC bidirectional conversion circuit.
Background
The alternating current-direct current bidirectional conversion circuit is a power frequency alternating current and direct current mutual conversion circuit, so that a power supply conversion system becomes simpler and more efficient, along with the rapid development of new energy industry, the alternating current-direct current bidirectional conversion circuit is widely applied to various new energy power electronic devices such as photovoltaic energy storage, APF and the like, particularly in recent years, the integration of photovoltaic, wind power, energy storage and the development of high power are combined, the requirements of high-power three-phase alternating current conversion are more and more, and the application is more and more extensive. However, the current industry still uses the traditional T-type three-level or I-type three-level technology to make the T-type three-level or I-type three-level technology perform AC/DC bidirectional conversion, the switching frequency is rarely more than 20kHz at present due to the industry habit and the limitation of a high-voltage semiconductor, and the power inductance or EMC filtering has many challenges, such as large volume, high cost and large filtering difficulty; in particular, in order to realize filtering at low cost, an LCL filter is generally adopted in the industry, and the secondary resonance of the LCL filter is very easy to cause oscillation of a control loop, and in particular, in multi-machine parallel connection, the influence caused by the secondary resonance of the LCL filter is more obvious, the oscillation is more easy to occur, and more challenges are brought to loop control.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-phase AC-DC bidirectional conversion circuit which can improve the switching frequency, realize low-cost filtering, reduce the input-output voltage current ripple and reduce the control difficulty.
In order to solve the technical problems, the invention provides a three-phase alternating current-direct current bidirectional conversion circuit, which comprises three boost circuits and one output capacitor circuit, wherein the three boost circuits have the same structure, each boost circuit comprises an inductance circuit and a switch circuit, the inductance circuit comprises a first inductance and an auto-coupling inductance, the switch circuit comprises eight switch tubes and four diodes, each four switch tubes are connected in series to form a bridge arm, two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, each two diodes are connected in series and then connected with two switches Guan Binglian positioned in the middle of one bridge arm, a connection point between the two diodes connected in series is connected with the output capacitor circuit, the homonymous end of a primary winding of the auto-coupling inductance and the homonymous end of a secondary winding of the auto-coupling inductance are connected with one end of the first inductance respectively, the other side of the auto-coupling inductance circuit is used as a second external connection side of the three-phase alternating current-direct current (AC-DC) bidirectional conversion circuit, and the other end of the first inductance in the three-phase boost circuit is used as a first external connection side of the three-phase AC-DC bidirectional conversion circuit.
The further technical scheme is as follows: the output capacitor circuit comprises a fourth capacitor and a fifth capacitor, the fourth capacitor and the fifth capacitor are connected in series and then connected with bridge arms of the three-way boost circuit in parallel, and a connection point of the fourth capacitor and the fifth capacitor is a midpoint of the output capacitor circuit and is connected with a connection point between two diodes connected in series.
The further technical scheme is as follows: the three-phase AC-DC bidirectional conversion circuit further comprises an EMI filter circuit, wherein the EMI filter circuit comprises a first capacitor, a second capacitor and a third capacitor, and the first capacitor, the second capacitor and the third capacitor are respectively connected in parallel between the first external side of the three-phase AC-DC bidirectional conversion circuit and the midpoint of the output capacitor circuit.
The further technical scheme is as follows: and the switching tube is selected from a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
In order to solve the technical problems, the invention further provides a three-phase AC-DC bidirectional conversion circuit, which comprises a boost circuit and an output capacitor circuit with the same three-way structure, wherein each boost circuit comprises an inductance circuit and a switch circuit, the inductance circuit comprises a first inductance and an auto-coupling inductance, the switch circuit comprises four switch tubes, a first bidirectional switch and a second bidirectional switch, each two switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of a primary winding of the auto-coupling inductance and the homonymous end of a secondary winding of the auto-coupling inductance are connected with one end of the first inductance, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are respectively connected with the first bidirectional switch and the second bidirectional switch, the midpoints of the two bridge arms are respectively connected with a connecting node of the auto-coupling inductance and the first bidirectional switch and a connecting node of the auto-coupling inductance and the second bidirectional switch, and the other side of the output capacitor circuit is used as a third side of the three-phase AC-DC bidirectional conversion circuit, and the other side of the three-phase AC-DC bidirectional conversion circuit is used as a third side of the three-phase AC-DC bidirectional conversion circuit.
In order to solve the technical problems, the invention also provides a three-phase AC-DC bidirectional conversion circuit, which comprises three boost circuits with the same structure and one output capacitor circuit, wherein each boost circuit comprises an inductance circuit and a switch circuit, each inductance circuit comprises a first inductance and an autotransformer, each switch circuit comprises four switch tubes, each two switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of a primary winding of the autotransformer and the homonymous end of a secondary winding of the autotransformer are both connected with one end of the first inductance, the homonymous end of the primary winding of the autotransformer and the homonymous end of the secondary winding of the autotransformer are respectively connected with the middle point of one bridge arm, the other side of the output capacitor circuit is used as the second external side of the three-phase AC-DC bidirectional conversion circuit, and the other end of the first inductance in the three-phase boost circuit is used as the first external side of the three-phase AC-DC bidirectional conversion circuit.
The further technical scheme is as follows: the output capacitor circuit comprises a sixth capacitor, and the sixth capacitor is connected with the bridge arm of the three-way boost circuit in parallel.
Compared with the prior art, the switching tube of the boost circuit in the three-phase AC-DC bidirectional conversion circuit can realize bidirectional energy flow, the three-phase boost circuit adopts a three-phase interleaving technology, the phase difference between three-phase input current and output current is 120 degrees, the input current fluctuation and the output current fluctuation of the three-phase boost circuit are complementary, so that the input voltage ripple and the output voltage ripple of the three-phase AC-DC bidirectional conversion circuit are smaller, good circuit performance is realized, the first inductor and the self-coupling inductor are arranged in each boost circuit, the switching frequency can be improved in an interleaving parallel mode, low-cost filtering is realized, the control difficulty is reduced, the input-output voltage ripple can be further reduced, the two branches where the self-coupling inductor is located can realize current sharing in an interleaving mode, uneven heating of branch devices can be prevented, and the circuit can work normally.
Drawings
Fig. 1 is a circuit schematic of a first embodiment of the three-phase AC-DC bi-directional conversion circuit of the present invention.
Fig. 2 is a circuit schematic of a second embodiment of the three-phase AC-DC bi-directional conversion circuit of the present invention.
Fig. 3 is a circuit schematic of a third embodiment of the three-phase AC-DC bi-directional conversion circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples below in order to more clearly understand the objects, technical solutions and advantages of the present invention to those skilled in the art.
Referring to fig. 1, fig. 1 is a circuit schematic of a first embodiment of a three-phase AC-DC bi-directional conversion circuit 10 according to the present invention. In the embodiment shown in the drawings, the three-phase AC-DC bidirectional conversion circuit 10 includes three-way boost circuits and one output capacitor circuit with the same structure, where each boost circuit includes an inductor circuit and a switch circuit, the inductor circuit includes a first inductor and an auto-inductor, the switch circuit includes eight switch tubes and four diodes, each four switch tubes are connected in series to form a bridge arm, two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, each two diodes are connected in series and then connected to two switches Guan Binglian located in the middle of one bridge arm, a connection point between the two diodes connected in series is connected to the output capacitor circuit, the homonymous end of the primary winding and the homonymous end of the secondary winding of the auto-inductor are both connected to one end of the first inductor, the homonymous end of the primary winding and the homonymous end of the secondary winding of the auto-inductor are respectively connected to a midpoint of one bridge arm, the other side of the output capacitor circuit is used as the second external connection side of the three-phase AC-DC bidirectional conversion circuit 10, and the other end of the first inductor in the three-way boost circuit is used as the first external connection side of the three-phase AC-DC bidirectional conversion circuit 10. It can be understood that, in the three-phase AC-DC bidirectional conversion circuit 10 of the present invention, the first external side and the second external side can be connected to the load and the AC power source, when the first external side is used as the AC side, the AC power source can be externally connected, when the second external side is used as the DC output side, the load can be externally connected, and when the second external side is used as the AC side, the AC power source can be externally connected, and when the first external side is used as the DC output side, the load can be externally connected. Based on the design, the first inductor and the self-coupling inductor are arranged in each path of boost circuit, the switching frequency can be improved through a staggered parallel connection mode, low-cost filtering is realized, the control difficulty is reduced, meanwhile, the stress is reduced, the input and output voltage current ripple is reduced, the three paths of boost circuits adopt a three-phase staggered technology, the three-phase input and output currents differ by 120 degrees, the input and output current ripple of the three-phase boost circuits are complementary, the input and output current ripple of the three-phase AC-DC bidirectional conversion circuit 10 is further enabled to be smaller, and the two branches where the self-coupling inductor is located can realize current sharing in a staggered mode no matter when energy flows forwards or reversely, uneven heating of branch devices can be prevented, over-current protection is prevented from being triggered due to uneven branch currents, the circuit can work normally, and therefore the purpose of improving the circuit performance is achieved.
Specifically, in this embodiment, the boost circuits with the same three-way structure are a first boost circuit, a second boost circuit and a third boost circuit, where the inductor circuit in the first boost circuit includes a first inductor L1 and an autotransformer L2, the switch circuit includes a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, a bridge arm formed by connecting the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 in series is connected with a synonym end of a primary winding of the autotransformer L2, the third switch Q3 and the fourth switch Q4 are located between the second switch Q1 and the second diode D2, and the third diode D2 are connected in parallel, and the bridge arm is connected between the second diode D2 and the output capacitor D2 and the first diode D2 is connected between the first diode D2 and the second diode D2 and the output capacitor D2; the bridge arm midpoint formed by connecting the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 in series is connected with the same-name end of the secondary winding of the self-coupling inductor L2, the seventh switching tube Q7 and the eighth switching tube Q8 in the bridge arm are positioned in the middle, the third diode D3 and the fourth diode D4 are connected in series and then connected with the seventh switching tube Q7 and the eighth switching tube Q8 in series in parallel, and the connection point between the third diode D3 and the fourth diode D4 is connected with an output capacitor circuit, namely the anode of the third diode D3 and the cathode of the fourth diode D4 are connected with the output capacitor circuit.
The inductor circuit in the second boost circuit comprises a first inductor L3 and an auto-coupling inductor L4, the switch circuit comprises a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15, a sixteenth switch tube Q16, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8, the midpoint of a bridge arm formed by the series connection of the ninth switch tube Q9, the tenth switch tube Q10, the eleventh switch tube Q11 and the twelfth switch tube Q12 is connected with the synonym end of a primary winding of the auto-coupling inductor L4, the eleventh switch tube Q11 and the twelfth switch tube Q12 are positioned in the middle, the fifth diode D5 and the sixth diode D6 are connected in parallel after being connected in series, the bridge arm is connected with the eleventh switch tube Q11 and the twelfth switch tube Q12 in parallel, the output capacitor D6 is connected with the output capacitor D5 after the output capacitor D6 is connected between the fifth diode D5 and the sixth diode; the bridge arm midpoint formed by connecting the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15 and the sixteenth switching tube Q16 in series is connected with the same name end of the secondary winding of the self-coupling inductor L4, the fifteenth switching tube Q15 and the sixteenth switching tube Q16 in the bridge arm are positioned in the middle, the seventh diode D7 and the eighth diode D8 are connected in series and then connected with the fifteenth switching tube Q15 and the sixteenth switching tube Q16 in parallel, the connection point between the seventh diode D7 and the eighth diode D8 is connected with an output capacitor circuit, namely the anode of the seventh diode D7 and the cathode of the eighth diode D8 are connected with the output capacitor circuit.
The switching circuit comprises a seventeenth switching tube Q17, an eighteenth switching tube Q18, a nineteenth switching tube Q19, a twentieth switching tube Q20, a twenty first switching tube Q21, a twenty second switching tube Q22, a twenty third switching tube Q23, a twenty fourth switching tube Q24, a ninth diode D9, a tenth diode D10, an eleventh diode D11 and a twelfth diode D12, wherein the midpoint of a bridge arm formed by connecting the seventeenth switching tube Q17, the eighteenth switching tube Q18, the nineteenth switching tube Q19 and the twentieth switching tube Q20 in series is connected with the different name end of the primary winding of the self-coupling inductor L6, the nineteenth switching tube Q19 and the twentieth switching tube Q20 are positioned in the middle, the ninth diode D9 and the twelfth diode D10 are connected in series and then are connected with the nineteenth switching tube Q19 and the twenty fourth switching tube Q20 in parallel, the connection point between the nineteenth diode D9 and the twelfth diode D10 is connected with the output capacitor D10, and the output capacitor D10 is connected between the output end of the nineteenth switching tube and the twelfth diode; the bridge arm midpoint formed by the twenty-first switch tube Q21, the twenty-second switch tube Q22, the twenty-third switch tube Q23 and the twenty-fourth switch tube Q24 which are connected in series is connected with the same name end of the secondary winding of the self-coupling inductor L4, the twenty-third switch tube Q23 and the twenty-fourth switch tube Q24 in the bridge arm are positioned in the middle, the eleventh diode D11 and the twelfth diode D12 are connected in series and then connected with the twenty-third switch tube Q23 and the twenty-fourth switch tube Q24 which are connected in series in parallel, and the connection point between the eleventh diode D11 and the twelfth diode D12 is connected with an output capacitor circuit, namely the anode of the eleventh diode D11 and the cathode of the twelfth diode D12 are connected with the output capacitor circuit.
Preferably, the switching tube is a MOS, IGBT, gaN tube, a SiC power tube or other controllable power switching tube, so as to achieve better circuit performance. Further, the present embodiment adopts PFM to control the operation of the switching tube, that is, adopts a constant duty ratio, uses the on and off time of the constant switching tube, and then uses the square wave frequency modulation to realize adjustment, thereby realizing zero current on of the three-phase AC-DC bidirectional conversion circuit 10 in the low frequency operation state.
In some embodiments, the output capacitor circuit includes a fourth capacitor C4 and a fifth capacitor C5, where the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel with the bridge arm of the three-way boost circuit after being connected in series, and a connection point of the fourth capacitor C4 and the fifth capacitor C5 is a midpoint of the output capacitor circuit, and is connected between the first diode D1 and the second diode D2, between the third diode D3 and the fourth diode D4, between the fifth diode D5 and the sixth diode D6, between the seventh diode D7 and the eighth diode D8, between the ninth diode D9 and the tenth diode D10, and between the eleventh diode D11 and the twelfth diode D12 that are connected in series.
Further, in the present embodiment, the three-phase AC-DC bidirectional converter circuit 10 further includes an EMI filter circuit 13, where the EMI filter circuit 13 includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, and the first capacitor C1, the second capacitor C2, and the third capacitor C3 are respectively connected in parallel between the first external side of the three-phase AC-DC bidirectional converter circuit 10 and the midpoint of the output capacitor circuit. Based on the design, the added EMI filter circuit 13 enables the common mode noise of the whole three-phase AC-DC bidirectional conversion circuit 10 to have a bypass channel, so that the common mode noise is greatly reduced, the electromagnetic interference is favorably restrained, and the circuit reliability is improved.
Referring to fig. 2, fig. 2 is a circuit schematic of a second embodiment of the three-phase AC-DC bi-directional conversion circuit 10 according to the present invention. The present embodiment is different from the first embodiment in that the specific structure of the switch circuit in the boost circuit is different, and the rest of the structures are similar or identical. In this embodiment, the switching circuit includes four switching tubes, a first bidirectional switch and a second bidirectional switch, each two switching tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of the primary winding of the self-coupling inductor and the heteronymous end of the secondary winding of the self-coupling inductor are both connected with one end of the first inductor, the heteronymous end of the primary winding of the self-coupling inductor and the homonymous end of the secondary winding of the self-coupling inductor are respectively connected with the first bidirectional switch and the second bidirectional switch, the other ends of the first bidirectional switch and the second bidirectional switch are both connected with the output capacitor circuit, and midpoints of the two bridge arms are respectively connected with a connection node of the self-coupling inductor and the first bidirectional switch and a connection node of the self-coupling inductor and the second bidirectional switch. The present embodiment can also achieve good circuit performance.
Specifically, in this embodiment, the switching circuit in the first boost circuit includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a first bidirectional switch S1 and a second bidirectional switch S2, a bridge arm midpoint formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected to a connection node of a heteronymous end of the primary winding of the first bidirectional switch S1 and the self-coupling inductor L2, a bridge arm midpoint formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected to a connection node of the homonymous end of the secondary winding of the second bidirectional switch S2 and the self-coupling inductor L2, and the first bidirectional switch S1 and the second bidirectional switch S2 are both connected to a midpoint of the output capacitor circuit; the switching circuit in the second boost circuit comprises a first switching tube Q21, a second switching tube Q22, a third switching tube Q23, a fourth switching tube Q24, a first bidirectional switch S3 and a second bidirectional switch S4, wherein the midpoint of a bridge arm formed by connecting the first switching tube Q21 and the second switching tube Q22 in series is connected with a connecting node of a heteronymous end of a primary winding of the first bidirectional switch S3 and the self-coupling inductor L4, the midpoint of the bridge arm formed by connecting the third switching tube Q23 and the fourth switching tube Q24 in series is connected with a connecting node of a homonymous end of a secondary winding of the second bidirectional switch S4 and the self-coupling inductor L4, and the first bidirectional switch S3 and the second bidirectional switch S4 are both connected with the midpoint of the output capacitor circuit; the switching circuit in the third boost circuit comprises a first switching tube Q31, a second switching tube Q32, a third switching tube Q33, a fourth switching tube Q34, a first bidirectional switch S5 and a second bidirectional switch S6, wherein the midpoint of a bridge arm formed by connecting the first switching tube Q31 and the second switching tube Q32 in series is connected with a connecting node of a heteronymous end of a primary winding of the first bidirectional switch S5 and the self-coupling inductor L6, the midpoint of a bridge arm formed by connecting the third switching tube Q33 and the fourth switching tube Q34 in series is connected with a connecting node of a homonymous end of a secondary winding of the second bidirectional switch S6 and the self-coupling inductor L6, and the first bidirectional switch S5 and the second bidirectional switch S6 are both connected with the midpoint of the output capacitor circuit.
Referring to fig. 3, fig. 3 is a circuit schematic of a third embodiment of the three-phase AC-DC bi-directional conversion circuit 10 according to the present invention. The difference between the present embodiment and the first embodiment is that the specific structures of the switch circuit and the output capacitor circuit in the boost circuit are different, and the EMI filter circuit is not provided in the present embodiment, and the other structures are similar or identical. In this embodiment, the switching circuit includes four switching tubes, each two switching tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of the primary winding of the self-coupling inductor and the homonymous end of the secondary winding of the self-coupling inductor are both connected to one end of the first inductor, and the homonymous end of the primary winding of the self-coupling inductor and the homonymous end of the secondary winding of the self-coupling inductor are respectively connected to the midpoint of the bridge arm; and the output capacitor circuit comprises a sixth capacitor C6, and the sixth capacitor C6 is connected with a bridge arm of the three-way boost circuit in parallel.
Specifically, in this embodiment, the switching circuit in the first boost circuit includes a first switching tube Q41, a second switching tube Q42, a third switching tube Q43 and a fourth switching tube Q44, where a bridge arm midpoint formed by connecting the first switching tube Q41 and the second switching tube Q42 in series is connected to a synonym end of the primary winding of the autotransformer L2, and a bridge arm midpoint formed by connecting the third switching tube Q43 and the fourth switching tube Q44 in series is connected to a synonym end of the secondary winding of the autotransformer L2; the switching circuit in the second boost circuit comprises a first switching tube Q51, a second switching tube Q52, a third switching tube Q53 and a fourth switching tube Q54, wherein the middle point of a bridge arm formed by connecting the first switching tube Q51 and the second switching tube Q52 in series is connected with the synonym end of the primary winding of the self-coupling inductor L4, and the middle point of the bridge arm formed by connecting the third switching tube Q53 and the fourth switching tube Q54 in series is connected with the synonym end of the secondary winding of the self-coupling inductor L4; the switching circuit in the third boost circuit comprises a first switching tube Q61, a second switching tube Q62, a third switching tube Q63 and a fourth switching tube Q64, wherein the middle point of a bridge arm formed by connecting the first switching tube Q61 and the second switching tube Q62 in series is connected with the synonym end of the primary winding of the self-coupling inductor L6, and the middle point of the bridge arm formed by connecting the third switching tube Q63 and the fourth switching tube Q64 in series is connected with the synonym end of the secondary winding of the self-coupling inductor L6.
In summary, the switching tube in the three-phase AC-DC bidirectional conversion circuit can realize bidirectional energy flow, the three-phase boost circuit adopts a three-phase interleaving technology, the three-phase input current and the three-phase output current differ by 120 degrees, the input current fluctuation and the output current fluctuation of the three-phase boost circuit are complementary, so that the input voltage ripple and the output voltage ripple of the three-phase AC-DC bidirectional conversion circuit are smaller, good circuit performance is realized, each of the three-phase boost circuit is formed by connecting two boost circuits with the same two-phase frequency and 180-degree phase difference in parallel, the boost inductor adopts a three-inductance structure of the first inductor and the self-coupling inductor, the switching frequency can be improved in an interleaving mode, the low-cost filtering is realized, the control difficulty is reduced, the input voltage ripple and the output voltage ripple can be further reduced, the two branches where the self-coupling inductor are positioned can realize current equalization no matter when the energy flows forward or backward, the heating of the branch devices is prevented, and the working performance of the circuit is further improved.
The foregoing is merely 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 or modifications made within the scope of the claims shall fall within the scope of the present invention.
Claims (7)
1. A three-phase AC-DC bidirectional conversion circuit is characterized in that: the three-phase AC-DC bidirectional conversion circuit comprises three-way boost circuits and one output capacitor circuit, wherein each boost circuit comprises an inductance circuit and a switch circuit, each inductance circuit comprises a first inductance and an auto-coupling inductance, each switch circuit comprises eight switch tubes and four diodes, each four switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, each two diodes are connected in series and then connected with two switches Guan Binglian positioned in the middle of one bridge arm, a connection point between the two diodes connected in series is connected with the output capacitor circuit, the homonymous end of a primary winding of the auto-coupling inductance and the homonymous end of a secondary winding of the auto-coupling inductance are connected with one end of the first inductance, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are respectively connected with the middle point of one bridge arm, the other side of the output capacitor circuit is used as the second external side of the three-phase AC-DC bidirectional conversion circuit, and the other end of the first inductance in the three-way boost circuit is used as the first external side of the three-phase AC-DC bidirectional conversion circuit.
2. The three-phase AC-DC bi-directional conversion circuit according to claim 1, wherein: the output capacitor circuit comprises a fourth capacitor and a fifth capacitor, the fourth capacitor and the fifth capacitor are connected in series and then connected with bridge arms of the three-way boost circuit in parallel, and a connection point of the fourth capacitor and the fifth capacitor is a midpoint of the output capacitor circuit and is connected with a connection point between two diodes connected in series.
3. The three-phase AC-DC bi-directional conversion circuit according to claim 2, wherein: the three-phase AC-DC bidirectional conversion circuit further comprises an EMI filter circuit, wherein the EMI filter circuit comprises a first capacitor, a second capacitor and a third capacitor, and the first capacitor, the second capacitor and the third capacitor are respectively connected in parallel between the first external side of the three-phase AC-DC bidirectional conversion circuit and the midpoint of the output capacitor circuit.
4. The three-phase AC-DC bi-directional conversion circuit according to claim 1, wherein: and the switching tube is selected from a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
5. A three-phase AC-DC bidirectional conversion circuit is characterized in that: the three-phase AC-DC bidirectional conversion circuit comprises three-way boost circuits and one output capacitor circuit, wherein each boost circuit comprises an inductance circuit and a switch circuit, each inductance circuit comprises a first inductance and an auto-coupling inductance, each switch circuit comprises four switch tubes, a first bidirectional switch and a second bidirectional switch, each two switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of a primary winding of the auto-coupling inductance and the homonymous end of a secondary winding of the auto-coupling inductance are connected with one end of the first inductance, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are respectively connected with the first bidirectional switch and the second bidirectional switch, the midpoints of the two bridge arms are respectively connected with a connecting node of the auto-coupling inductance and the first bidirectional switch and a connecting node of the auto-coupling inductance and the second bidirectional switch, the other side of the output capacitor circuit is used as a second external side of the three-phase AC-DC bidirectional conversion circuit, and the other side of the three-phase AC-DC bidirectional conversion circuit is used as a second external AC-DC bidirectional conversion circuit.
6. A three-phase AC-DC bidirectional conversion circuit is characterized in that: the three-phase AC-DC bidirectional conversion circuit comprises three paths of boost circuits and one path of output capacitor circuit, wherein each boost circuit comprises an inductance circuit and a switch circuit, each inductance circuit comprises a first inductance and an auto-coupling inductance, each switch circuit comprises four switch tubes, each two switch tubes are connected in series to form a bridge arm, the two bridge arms are connected in parallel and then connected to one side of the output capacitor circuit, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are both connected with one end of the first inductance, the homonymous end of the primary winding of the auto-coupling inductance and the homonymous end of the secondary winding of the auto-coupling inductance are respectively connected with the middle point of one bridge arm, the other side of the output capacitor circuit is used as the second external side of the three-phase AC-DC bidirectional conversion circuit, and the other end of the first inductance in the three-path boost circuit is used as the first external side of the three-phase AC-DC bidirectional conversion circuit.
7. The three-phase AC-DC bi-directional conversion circuit according to claim 6, wherein: the output capacitor circuit comprises a sixth capacitor, and the sixth capacitor is connected with the bridge arm of the three-way boost circuit in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211104497.2A CN116131651A (en) | 2022-09-09 | 2022-09-09 | Three-phase AC-DC bidirectional conversion circuit |
| PCT/CN2023/104843 WO2024051322A1 (en) | 2022-09-09 | 2023-06-30 | Three-phase ac-dc bidirectional conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211104497.2A CN116131651A (en) | 2022-09-09 | 2022-09-09 | Three-phase AC-DC bidirectional conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN116131651A true CN116131651A (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211104497.2A Pending CN116131651A (en) | 2022-09-09 | 2022-09-09 | Three-phase AC-DC bidirectional conversion circuit |
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| Country | Link |
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| CN (1) | CN116131651A (en) |
| WO (1) | WO2024051322A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051322A1 (en) * | 2022-09-09 | 2024-03-14 | 深圳深源技术能源有限公司 | Three-phase ac-dc bidirectional conversion circuit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024571B (en) * | 2014-04-29 | 2017-09-12 | 艾默生网络能源有限公司 | A kind of three-phase inverting circuit |
| EP3360243B1 (en) * | 2015-10-05 | 2020-12-23 | Heliox B.V. | A bidirectional power converter |
| CN108400705A (en) * | 2017-02-04 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of non-bridge PFC circuits |
| CN107204720B (en) * | 2017-07-03 | 2018-08-21 | 珠海英搏尔电气股份有限公司 | A kind of ac-dc conversion circuit, AC/DC convertor and its control method |
| CN109802587B (en) * | 2019-02-28 | 2019-10-18 | 山东大学 | Three level NPC converter system of modularization and control method based on coupling inductance |
| CN116131651A (en) * | 2022-09-09 | 2023-05-16 | 深圳深源技术能源有限公司 | Three-phase AC-DC bidirectional conversion circuit |
| CN218549779U (en) * | 2022-09-09 | 2023-02-28 | 深圳深源技术能源有限公司 | Three-phase AC-DC bidirectional conversion circuit |
-
2022
- 2022-09-09 CN CN202211104497.2A patent/CN116131651A/en active Pending
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2023
- 2023-06-30 WO PCT/CN2023/104843 patent/WO2024051322A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051322A1 (en) * | 2022-09-09 | 2024-03-14 | 深圳深源技术能源有限公司 | Three-phase ac-dc bidirectional conversion circuit |
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| WO2024051322A1 (en) | 2024-03-14 |
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