Interleaved parallel three-level three-switch rectifier topology circuit

Abstract

The invention relates to the technical field of three-level converters, in particular to an interleaving parallel type three-level three-switch rectifier topology circuit which comprises a first rectifier module, a second rectifier module, a third rectifier module, a first capacitor and a second capacitor. The first diode assembly comprises first to fourth diodes; the second rectification module comprises a second diode assembly and a second switch assembly. The second diode assembly comprises fifth to eighth diodes. The third rectification module comprises a third diode assembly and a third switch assembly. The third diode assembly comprises a ninth diode to a twelfth diode. Therefore, the problem that each phase circuit of the interleaving parallel Vienna rectifier topology is composed of four power switch tubes, and the economic burden is increased is solved. The number of switching tube devices is reduced, and economic cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of three-level converters, and in particular to a staggered parallel three-level three-switch rectifier topology circuit. Background Art

[0002] The three-level converter, as the simplest multi-level converter, points the way for the development of large-capacity converters. The three-level converter has the advantages of low switching loss, low voltage stress, good output harmonic characteristics and small filter element requirements. It gradually replaces the two-level converter and is widely used in medium- and low-voltage high-power occasions such as industrial power supplies, electric vehicles, photovoltaic power generation, and rail transit. The Vienna rectifier topology in the related art consists of four diodes and a power switch tube to form a bidirectional switch. Another Vienna rectifier topology improves the bidirectional switch in the traditional Vienna topology into two back-to-back connected power switch tubes. While retaining the advantages of the Vienna topology structure, high-frequency modulation is used to reduce the filter volume and improve the power density of the system. Due to the high degree of modularization of the interleaved parallel three-level rectifier, the inverter current output capacity can be improved. The interleaved parallel three-level Vienna rectifier is widely used in medium-voltage high-power occasions. However, each phase circuit of the interleaved parallel Vienna rectifier topology consists of four power switch tubes, which increases the economic burden. Summary of the invention

[0003] The present application provides an interleaved parallel type three-level three-switch rectifier topology circuit to solve the problem that each phase circuit of the interleaved parallel type Vienna rectifier topology is composed of four power switch tubes, which increases the economic burden.

[0004] The first aspect of the present application provides a staggered parallel type three-level three-switch rectifier topology circuit, including: a first rectifier module to a third rectifier module, a first capacitor and a second capacitor, wherein:

[0005] The first rectifier module includes a first diode component and a first switch component, the first diode component includes first to fourth diodes, the connection node between the first diode and the third diode is respectively connected to the first output end of the first phase voltage and the first input end of the first switch component, the connection node between the second diode and the fourth diode is respectively connected to the second output end of the first phase voltage and the second input end of the first switch component, the output end of the first switch component is connected to the connection node between the first capacitor and the second capacitor, the cathode of the first diode is connected to the cathode of the second diode, the anode of the first diode is connected to the cathode of the third diode, the anode of the third diode is connected to the anode of the fourth diode, and the anode of the second diode is connected to the cathode of the fourth diode; the second rectifier module includes a second diode component and a second switch component, the second diode component includes fifth to eighth diodes, the connection point between the fifth diode and the seventh diode is respectively connected to the first output end of the second phase voltage and the first input end of the second switch component, the connection point between the sixth diode and the eighth diode is respectively connected to the second output end of the second phase voltage and the second input end of the second switch component, The output end of the second switch component is connected to the connection node between the first capacitor and the second capacitor, the cathode of the fifth diode is respectively connected to the cathode of the second diode and the cathode of the sixth diode, the anode of the fifth diode is connected to the anode of the seventh diode, the anode of the seventh diode is respectively connected to the anode of the fourth diode and the anode of the eighth diode, and the cathode of the eighth diode is connected to the cathode of the sixth diode; the third rectifier module includes a third diode component and a third switch component, the third diode component includes a ninth diode to a twelfth diode, the connection node between the ninth diode and the eleventh diode is respectively connected to the first output end of the third phase voltage and the first input end of the third switch component, the connection node between the tenth diode and the twelfth diode is respectively connected to the second output end of the third phase voltage and the second input end of the third switch component, and the output end of the third switch component is connected to the connection node between the first capacitor and the second capacitor; one end of the first capacitor is connected to the cathode of the tenth diode, the other end of the first capacitor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the anode of the twelfth diode.

[0006] Optionally, the first switch component includes: a first triode unit, a thirteenth diode, and a fourteenth diode, wherein the first end of the first triode unit is connected to the connection node between the first diode and the third diode, the second end of the first triode unit is connected to the connection node between the second diode and the fourth diode, the third end of the first triode unit is connected to the anode of the thirteenth diode, and the fourth end of the first triode unit is connected to the cathode of the fourteenth diode; the cathode of the thirteenth diode is connected to the anode of the fourteenth diode, and the cathode of the thirteenth diode and the anode of the fourteenth diode are both connected to the other end of the first capacitor and one end of the second capacitor.

[0007] Optionally, the first triode unit includes: a first triode, a second triode, a third triode, a fifteenth diode, and a sixteenth diode, wherein the emitter of the first triode is respectively connected to the emitter of the second triode, the anode of the thirteenth diode, and the anode of the fifteenth diode, and the collector of the first triode is respectively connected to the connection node between the first diode and the third diode, and the cathode of the sixteenth diode; the collector of the second triode is respectively connected to the cathode of the fourteenth diode, the collector of the third triode, and the cathode of the sixteenth diode; the emitter of the third triode is respectively connected to the anode of the sixteenth diode, and the connection node between the second diode and the fourth diode.

[0008] Optionally, the second switch component includes a second triode unit, a seventeenth diode, and an eighteenth diode, wherein the first end of the second triode unit is connected to the connection node between the fifth diode and the seventh diode, the second end of the second triode unit is connected to the connection node between the sixth diode and the eighth diode, the third end of the second triode unit is connected to the anode of the seventeenth diode, and the fourth end of the second triode unit is connected to the cathode of the eighteenth diode; the cathode of the seventeenth diode is respectively connected to the anode of the eighteenth diode and the anode of the fourteenth diode, and the cathode of the seventeenth diode and the anode of the eighteenth diode are both connected to the other end of the first capacitor and one end of the second capacitor.

[0009] Optionally, the second triode unit includes a fourth triode, a fifth triode, a sixth triode, a nineteenth diode, and a twentieth diode, wherein the emitter of the fourth triode is respectively connected to the emitter of the fifth triode, the anode of the seventeenth diode, and the anode of the nineteenth diode, and the collector of the fourth triode is respectively connected to the connection node between the fifth diode and the seventh diode, and the cathode of the nineteenth diode; the collector of the fifth triode is respectively connected to the cathode of the eighteenth diode, the collector of the sixth triode, and the cathode of the twentieth diode; the emitter of the sixth triode is respectively connected to the connection node between the sixth diode and the eighth diode, and the anode of the twentieth diode.

[0010] Optionally, the three-switch component includes a third triode unit, a twenty-first diode, and a twenty-second diode, wherein the first end of the third triode unit is connected to the connection node between the ninth diode and the eleventh diode, the second end of the third triode unit is connected to the connection node between the tenth diode and the twelfth diode, the third end of the third triode unit is connected to the anode of the twenty-first diode, and the fourth end of the third triode unit is connected to the cathode of the twenty-second diode; the cathode of the twenty-first diode is connected to the anode of the eighteenth diode and the anode of the twenty-second diode, and the cathode of the twenty-first diode and the anode of the twenty-second diode are both connected to the other end of the first capacitor and one end of the second capacitor.

[0011] Optionally, the third triode unit includes a seventh triode, an eighth triode, a ninth triode, a twenty-third diode, and a twenty-fourth diode, wherein the emitter of the seventh triode is connected to the emitter of the eighth triode, the anode of the twenty-third diode, and the anode of the twenty-first diode, and the collector of the seventh triode is respectively connected to the cathode of the twenty-third diode and the connection node between the ninth diode and the eleventh diode; the collector of the eighth triode is respectively connected to the cathode of the twenty-second diode, the collector of the ninth triode, and the cathode of the twenty-fourth diode; and the emitter of the ninth triode is respectively connected to the connection node between the tenth diode and the twelfth diode, and the anode of the twenty-fourth diode.

[0012] Optionally, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit also includes: a first inductor and a second inductor, wherein one end of the first inductor is connected to the first output end of the first phase voltage, and the other end of the first inductor is respectively connected to the connection node between the first diode and the third diode, the collector of the first transistor and the cathode of the fifteenth diode; one end of the second inductor is connected to the second output end of the first phase voltage and one end of the first inductor, and the other end of the second inductor is connected to the connection node between the second diode and the fourth diode, the emitter of the third transistor and the anode of the sixteenth diode.

[0013] Optionally, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit also includes: a third inductor and a fourth inductor, wherein one end of the third inductor is connected to the first output end of the second phase voltage, and the other end of the third inductor is connected to the connection node between the fifth diode and the seventh diode, the collector of the fourth transistor and the cathode of the nineteenth diode; one end of the fourth inductor is connected to one end of the third inductor and the second output end of the second phase voltage, and the other end of the fourth inductor is respectively connected to the connection node between the sixth diode and the eighth diode, the emitter of the sixth transistor and the anode of the twentieth diode.

[0014] Optionally, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit also includes: a fifth inductor and a sixth inductor, wherein one end of the fifth inductor is connected to the first output end of the third phase voltage, and the other end of the fifth inductor is connected to the connection node between the ninth diode and the eleventh diode, the collector of the seventh transistor, and the cathode of the twenty-third diode; one end of the sixth inductor is connected to the second output end of the third phase voltage and one end of the fifth inductor, and the other end of the sixth inductor is connected to the connection node between the tenth diode and the twelfth diode, the emitter of the ninth transistor, and the anode of the twenty-fourth diode.

[0015] In the above embodiment, the first to third rectifier modules, the first capacitor and the second capacitor are included, wherein the first rectifier module includes the first diode component and the first switch component, and the first diode component includes the first to fourth diodes; the second rectifier module includes the second diode component and the second switch component, and the second diode component includes the fifth to eighth diodes; the third rectifier module includes the third diode component and the third switch component, and the third diode component includes the ninth to twelfth diodes. Thus, the problem that each phase circuit of the staggered parallel Vienna rectifier topology is composed of four power switch tubes, which increases the economic burden, is solved, the number of switch tube devices is reduced, and the economic cost is reduced.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is an example diagram of an interleaved parallel three-level three-switch rectifier topology circuit according to an embodiment of the present application;

[0019] Figure 2 Schematic diagram of a single-phase equivalent circuit of an interleaved parallel three-level three-switch rectifier in switch state 1 according to one embodiment of the present application;

[0020] Figure 3 Schematic diagram of a single-phase equivalent circuit of an interleaved parallel type three-level three-switch rectifier in switch state 2 and with current flowing out according to one embodiment of the present application;

[0021] Figure 4 Schematic diagram of a single-phase equivalent circuit of an interleaved parallel type three-level three-switch rectifier in switch state 2 and with current flowing in according to one embodiment of the present application;

[0022] Figure 5 Schematic diagram of a single-phase equivalent circuit of an interleaved parallel type three-level three-switch rectifier in switch state 3 and with current flowing out according to one embodiment of the present application;

[0023] Figure 6 Schematic diagram of a dual-carrier phase-shifted 180° modulation method for an interleaved parallel rectifier according to an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of a control signal of a power tube Sx3 according to an embodiment of the present application;

[0025] Figure 8 It is a schematic diagram of the simulation result of the output voltage Udc according to one embodiment of the present application;

[0026] Fig. 9 is a schematic diagram of output current simulation results according to an embodiment of the present application;

[0027] Fig.10 A schematic diagram of capacitor voltage simulation results according to an embodiment of the present application;

[0028] Fig.11 FIG. 4 is a schematic diagram of output current ripple simulation results according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] The following describes the staggered parallel three-level three-switch rectifier topology circuit of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that each phase circuit of the staggered parallel Vienna rectifier topology mentioned in the above background technology is composed of four power switch tubes, which increases the economic burden, the present application provides a staggered parallel three-level three-switch rectifier topology circuit, in which the first to third rectifier modules, the first capacitor and the second capacitor are included, wherein the first rectifier module includes a first diode component and a first switch component, and the first diode component includes the first to fourth diodes; the second rectifier module includes a second diode component and a second switch component, and the second diode component includes the fifth to the eighth diode; the third rectifier module includes a third diode component and a third switch component, and the third diode component includes the ninth diode to the twelfth diode. Thus, the problem that each phase circuit of the staggered parallel Vienna rectifier topology is composed of four power switch tubes, which increases the economic burden, reduces the number of switch tube devices, and reduces economic costs.

[0031] Specifically, Figure 1 A schematic diagram of an interleaved parallel three-level three-switch rectifier topology circuit provided in an embodiment of the present application.

[0032] like Figure 1 As shown, the staggered parallel three-level three-switch rectifier topology circuit includes: first to third rectifier modules, a first capacitor C1 and a second capacitor C2, wherein:

[0033] The first rectifier module includes a first diode component and a first switch component. The first diode component includes first to fourth diodes. The connection node between the first diode Da1 and the third diode Da3 is respectively connected to the first output end of the first phase voltage Uga and the first input end of the first switch component. The connection node between the second diode Da2 and the fourth diode Da4 is respectively connected to the second output end of the first phase voltage Uga and the second input end of the first switch component. The output end of the first switch component is connected to the connection node between the first capacitor C1 and the second capacitor C2. The cathode of the first diode Da1 is connected to the cathode of the second diode Da2. The first diode Da1 The anode of the third diode Da3 is connected to the cathode of the third diode Da3, the anode of the third diode Da3 is connected to the anode of the fourth diode Da4, and the anode of the second diode Da2 is connected to the cathode of the fourth diode Da4; the second rectifier module includes a second diode component and a second switch component, the second diode component includes fifth to eighth diodes Db4, the connection point between the fifth diode Db1 and the seventh diode Db3 is respectively connected to the first output end of the second phase voltage Ugb and the first input end of the second switch component, the connection point between the sixth diode Db2 and the eighth diode Db4 is respectively connected to the second output end of the second phase voltage Ugb and the second input end of the second switch component The output end of the second switch component is connected to the connection node between the first capacitor C1 and the second capacitor C2, the cathode of the fifth diode Db1 is connected to the cathode of the second diode Da2 and the cathode of the sixth diode Db2 respectively, the anode of the fifth diode Db1 is connected to the anode of the seventh diode Db3, the anode of the seventh diode Db3 is connected to the anode of the fourth diode Da4 and the anode of the eighth diode Db4 respectively, and the cathode of the eighth diode Db4 is connected to the cathode of the sixth diode Db2; the third rectifier module includes a third diode component and a third switch component, the third diode component includes ninth diodes Dc1 to eleventh diodes Dc4, the ninth The connection node between the diode Dc1 and the eleventh diode Dc3 is respectively connected to the first output end of the third phase voltage Ugc and the first input end of the third switch component, the connection node between the tenth diode Dc2 and the eleventh diode Dc4 is respectively connected to the second output end of the third phase voltage Ugc and the second input end of the third switch component, and the output end of the third switch component is connected to the connection node between the first capacitor C1 and the second capacitor C2; one end of the first capacitor C1 is connected to the cathode of the tenth diode Dc2, the other end of the first capacitor C1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the anode of the eleventh diode Dc4.

[0034] Among them, it should be noted that the first output end of the first phase voltage Uga is connected to one end of the first inductor La1, the first output end of the first phase voltage Uga is connected to one end of the second inductor La2, the first input end of the first switch component can be understood as the collector of the first transistor Sa1, and the second input end of the first switch component can be understood as the emitter of the third transistor Sa2; the first output end of the second phase voltage Ugb is connected to one end of the third inductor Lb1, the second output end of the second phase voltage Ugb is connected to one end of the fourth inductor Lb2, the first input end of the second switch component can be understood as the collector of the fourth transistor Sb1, and the second input end of the second switch component can be understood as the emitter of the sixth transistor Sb2; the first output end of the third phase voltage Ugc is connected to one end of the fifth inductor Lc1, the second output end of the third phase voltage Ugc is connected to one end of the sixth inductor Lc2, the first input end of the third switch component can be understood as the collector of the seventh transistor Sc1, and the second input end of the second switch component can be understood as the emitter of the ninth transistor Sc2.

[0035] Optionally, in some embodiments, the first switch component includes: a first transistor unit, a thirteenth diode Da5, and a fourth diode Da6, wherein the first end of the first transistor unit is connected to the connection node between the first diode Da1 and the third diode Da3, the second end of the first transistor unit is connected to the connection node between the second diode Da2 and the fourth diode Da4, the third end of the first transistor unit is connected to the anode of the thirteenth diode Da5, and the fourth end of the first transistor unit is connected to the cathode of the fourth diode Da6; the cathode of the thirteenth diode Da5 is connected to the anode of the fourth diode Da6, and the cathode of the thirteenth diode Da5 and the anode of the fourth diode Da6 are both connected to the other end of the first capacitor C1 and one end of the second capacitor C2.

[0036] It should be noted that the first end of the first transistor unit can be understood as the collector of the first transistor Sa1, the second end of the first transistor unit can be understood as the emitter of the third transistor Sa2, the third end of the first transistor unit can be understood as the cathode of the thirteenth diode Da5, and the fourth end of the first transistor unit can be understood as the anode of the fourth diode Da6.

[0037] Optionally, in some embodiments, the first transistor unit includes: a first transistor Sa1, a second transistor Sa3, a third transistor Sa2, a fifteenth diode, and a sixteenth diode, wherein the emitter of the first transistor Sa1 is respectively connected to the emitter of the second transistor Sa3, the anode of the thirteenth diode Da5, and the anode of the fifteenth diode, and the collector of the first transistor Sa1 is respectively connected to the connection node between the first diode Da1 and the third diode Da3, and the cathode of the sixteenth diode; the collector of the second transistor Sa3 is respectively connected to the cathode of the fourth diode Da6, the collector of the third transistor Sa2, and the cathode of the sixteenth diode; the emitter of the third transistor Sa2 is respectively connected to the anode of the sixteenth diode, and the connection node between the second diode Da2 and the fourth diode Da4.

[0038] Optionally, in some embodiments, the second switch component includes a second triode unit, a seventeenth diode Db5, and an eighteenth diode Db6, wherein the first end of the second triode unit is connected to the connection node between the fifth diode Db1 and the seventh diode Db3, the second end of the second triode unit is connected to the connection node between the sixth diode Db2 and the eighth diode Db4, the third end of the second triode unit is connected to the anode of the seventeenth diode Db5, and the fourth end of the second triode unit is connected to the cathode of the eighteenth diode Db6; the cathode of the seventeenth diode Db5 is respectively connected to the anode of the eighteenth diode Db6 and the anode of the fourth diode Da6, and the cathode of the seventeenth diode Db5 and the anode of the eighteenth diode Db6 are both connected to the other end of the first capacitor C1 and one end of the second capacitor C2.

[0039] It should be noted that the first end of the second triode unit can be understood as the collector of the fourth triode Sb1, the second end of the second triode unit can be understood as the emitter of the sixth triode Sb2, the third end of the second triode unit can be understood as the cathode of the seventeenth diode Db5, and the fourth end of the second triode unit can be understood as the anode of the eighteenth diode Db6.

[0040] Optionally, in some embodiments, the second triode unit includes a fourth triode Sb1, a fifth triode Sb3, a sixth triode Sb2, a nineteenth diode, and a twentieth diode, wherein the emitter of the fourth triode Sb1 is respectively connected to the emitter of the fifth triode Sb3, the anode of the seventeenth diode Db5, and the anode of the nineteenth diode, and the collector of the fourth triode Sb1 is respectively connected to the connection node between the fifth diode Db1 and the seventh diode Db3, and the cathode of the nineteenth diode; the collector of the fifth triode Sb3 is respectively connected to the cathode of the eighteenth diode Db6, the collector of the sixth triode Sb2, and the cathode of the twentieth diode; the emitter of the sixth triode Sb2 is respectively connected to the connection node between the sixth diode Db2 and the eighth diode Db4, and the anode of the twentieth diode.

[0041] Optionally, in some embodiments, the third switch component includes a third triode unit, a twenty-first diode Dc5, and a twenty-second diode Dc6, wherein the first end of the third triode unit is connected to the connection node between the ninth diode Dc1 and the eleventh diode Dc3, the second end of the third triode unit is connected to the connection node between the tenth diode Dc2 and the twelfth diode Dc4, the third end of the third triode unit is connected to the anode of the twenty-first diode Dc5, and the fourth end of the third triode unit is connected to the cathode of the twenty-second diode Dc6; the cathode of the twenty-first diode Dc5 is connected to the anode of the eighteenth diode Db6 and the anode of the twenty-second diode Dc6, and the cathode of the twenty-first diode Dc5 and the anode of the twenty-second diode Dc6 are both connected to the other end of the first capacitor C1 and one end of the second capacitor C2.

[0042] It should be noted that the first end of the third triode unit can be understood as the collector of the seventh triode Sc1, the second end of the third triode unit can be understood as the emitter of the ninth triode Sc2, the third end of the third triode unit can be understood as the cathode of the twenty-first diode Dc5, and the fourth end of the third triode unit can be understood as the anode of the twenty-second diode Dc6.

[0043] Optionally, in some embodiments, the third triode unit includes a seventh triode Sc1, an eighth triode Sc3, a ninth triode Sc2, a twenty-third diode, and a twenty-fourth diode, wherein the emitter of the seventh triode Sc1 is connected to the emitter of the eighth triode Sc3, the anode of the twenty-third diode, and the anode of the twenty-first diode Dc5, and the collector of the seventh triode Sc1 is respectively connected to the cathode of the twenty-third diode and the connection node between the ninth diode Dc1 and the eleventh diode Dc3; the collector of the eighth triode Sc3 is respectively connected to the cathode of the twenty-second diode Dc6, the collector of the ninth triode Sc2, and the cathode of the twenty-fourth diode; the emitter of the ninth triode Sc2 is respectively connected to the connection node between the tenth diode Dc2 and the eleventh diode Dc4, and the anode of the twenty-fourth diode.

[0044] Optionally, in some embodiments, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit also includes: a first inductor La1 and a second inductor La2, wherein one end of the first inductor La1 is connected to the first output end of the first phase voltage Uga, and the other end of the first inductor La1 is respectively connected to the connection node between the first diode Da1 and the third diode Da3, the collector of the first transistor Sa1 and the cathode of the fifteenth diode; one end of the second inductor La2 is connected to the second output end of the first phase voltage Uga and one end of the first inductor La1, and the other end of the second inductor La2 is connected to the connection node between the second diode Da2 and the fourth diode Da4, the emitter of the third transistor Sa2 and the anode of the sixteenth diode.

[0045] Optionally, in some embodiments, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit further includes: a third inductor Lb1 and a fourth inductor Lb2, wherein one end of the third inductor Lb1 is connected to the first output end of the second phase voltage Ugb, and the other end of the third inductor Lb1 is connected to the connection node between the fifth diode Db1 and the seventh diode Db3, the collector of the fourth transistor Sb1 and the cathode of the nineteenth diode; one end of the fourth inductor Lb2 is connected to one end of the third inductor Lb1 and the second output end of the second phase voltage Ugb, and the other end of the fourth inductor Lb2 is respectively connected to the connection node between the sixth diode Db2 and the eighth diode Db4, the emitter of the sixth transistor Sb2 and the anode of the twentieth diode.

[0046] Optionally, in some embodiments, the above-mentioned staggered parallel three-level three-switch rectifier topology circuit further includes: a fifth inductor Lc1 and a sixth inductor Lc2, wherein one end of the fifth inductor Lc1 is connected to the first output end of the third phase voltage Ugc, and the other end of the fifth inductor Lc1 is connected to the connection node between the ninth diode Dc1 and the eleventh diode Dc3, the collector of the seventh transistor Sc1, and the cathode of the twenty-third diode; one end of the sixth inductor Lc2 is connected to the second output end of the third phase voltage Ugc and one end of the fifth inductor Lc1, and the other end of the sixth inductor Lc2 is connected to the connection node between the tenth diode Dc2 and the eleventh diode Dc4, the emitter of the ninth transistor Sc2, and the anode of the twenty-fourth diode.

[0047] Specifically, the three-phase system rectifier topology of the embodiment of the present application is as follows: Figure 1 As shown in the figure, in the interleaved parallel three-level three-switch rectifier topology, each phase circuit consists of three switch tubes S x1 , S x2 , S x3 (x=a, b, c), namely the first transistor Sa1, the second transistor Sa3, the third transistor Sa2, the fourth transistor Sb1, the fifth transistor Sb3, the sixth transistor Sb4, the seventh transistor Sc1, the eighth transistor Sc3, the ninth transistor Sc2, and the two diodes D x1 , D x2 (x=a, b, c), namely, the first to twelfth diodes, the thirteenth diode Da5, the fourth diode Da6, the seventeenth diode Db5, the eighteenth diode Db6, the twenty-first diode Dc5, and the twenty-second diode Dc6. It should be noted that S x1 With S x2 Complementary turn on and turn off.

[0048] The staggered parallel three-level three-switch rectifier topology has three switch states and four working modes, of which switch state 1 and switch state 3 correspond to one working mode respectively, and switch state 2 corresponds to two working modes according to different current directions. Taking a single-phase circuit as an example, the specific working principle is analyzed as follows:

[0049] (1) When the interleaved parallel three-level three-switch rectifier operates in switch state 1, its equivalent circuit is as follows: Figure 2 As shown, all transistors are turned off. At this time, the output current i0 flows through the diode D x1 and D x4 (i.e. the first to twelfth diodes), the output level is U dc .

[0050] (2) When the interleaved parallel three-level three-switch rectifier operates in switch state 2 and the current is flowing in the outflow direction, its equivalent circuit is as follows: Figure 3 As shown, the transistor S x2 , S x3 (Sa2, Sa3, Sb2, Sb3, Sc2, Sc3) are turned on, diode D x5 (ie Da5, Db5 and Dc5) are forward conducting. At this time, the output current i o Flowing through S x2 , S x3 and D x5 , the bridge arm end point is clamped to N level, and the output level is 1 / 2U dc .

[0051] (3) When the interleaved parallel three-level three-switch rectifier operates in switch state 2 and the current is flowing in, its equivalent circuit is as follows: Figure 4 As shown, the transistor S x1 , S x3 (Sa1, Sa3, Sb1, Sb3, Sc1, Sc3) are turned on, diode D x6 (i.e. Da6, Db6 and Dc6) are forward conducting. At this time, the output current i o Flowing through S x1 , S x3 , D x6 , the bridge arm end point is clamped to N level, and the output level is 1 / 2U dc .

[0052] (4) When the interleaved parallel three-level three-switch rectifier operates in switch state 3, its equivalent circuit is as follows: Figure 5 As shown, the a-phase switch tube S a2 , S a3 Turn on, diode D a5 Forward conduction, b-phase and c-phase switch tube S x1 , S x3 Turn on, diode D x6 Forward conduction. At this time, the output current i o Flowing through S a2 , S a3 , S b1 , S b3 , S c1 , S c3 , D a5 , D b6 , D c6 , the output level is 0.

[0053] In addition, the embodiment of the present application adopts a dual-carrier phase shift 180° modulation method to generate upper and lower complementary switching signals (T x1 , T x1’ ) to reduce the output current ripple, control signal schematic and Figure 6 As shown, where T x1 and T x2 ’ As the switch signal of the two parallel branches, the middle power tube S of the parallel branch x3 The control signal diagram is as follows Figure 7 shown.

[0054] In order to demonstrate the feasibility of the staggered parallel three-level three-switch rectifier topology, this application builds its simulation model. The simulation parameters are shown in Table 1 and the simulation results are shown in Table 1. Figure 8 to Figure 11 As shown. The initial capacitor voltage is 400V and the load resistance is 11.8Ω. The simulation results show that the DC bus voltage reaches stability in 0.4s, the three-phase current THD is 1.4%, the output current fluctuation range is less than 0.02A, and the voltage stress is U dc / 2, this topology reduces the current harmonics while reducing the power tubes. The simulation results show that the staggered parallel three-level three-switch rectifier topology proposed in the embodiment of the present application is feasible.

[0055] Table 1

[0056] parameter size <![CDATA[DC bus voltage U dc > 800V DC bus capacitor <![CDATA[C1=C2=2mF]]> <![CDATA[Switching frequency f s > 50kHz Pure resistance load 11.8Ω

[0057] According to the staggered parallel type three-level three-switch rectifier topology circuit proposed in the embodiment of the present application, it includes the first to third rectifier modules, the first capacitor and the second capacitor, wherein the first rectifier module includes the first diode component and the first switch component, and the first diode component includes the first to fourth diodes; the second rectifier module includes the second diode component and the second switch component, and the second diode component includes the fifth to eighth diodes; the third rectifier module includes the third diode component and the third switch component, and the third diode component includes the ninth to twelfth diodes. Thus, the problem that each phase circuit of the staggered parallel type Vienna rectifier topology is composed of four power switch tubes, which increases the economic burden, is solved, the number of switch tube devices is reduced, and the economic cost is reduced.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

Claims

1. A staggered parallel three-level three-switch rectifier topology circuit, characterized in that: include: The first rectifier module to the third rectifier module, the first capacitor and the second capacitor, wherein: The first rectifier module includes a first diode component and a first switch component, the first diode component includes first to fourth diodes, the connection node between the first diode and the third diode is respectively connected to the first output end of the first phase voltage and the first input end of the first switch component, the connection node between the second diode and the fourth diode is respectively connected to the second output end of the first phase voltage and the second input end of the first switch component, the output end of the first switch component is connected to the connection node between the first capacitor and the second capacitor, the cathode of the first diode is connected to the cathode of the second diode, the anode of the first diode is connected to the cathode of the third diode, the anode of the third diode is connected to the anode of the fourth diode, and the anode of the second diode is connected to the cathode of the fourth diode; The second rectifier module includes a second diode component and a second switch component, the second diode component includes fifth to eighth diodes, the connection point between the fifth diode and the seventh diode is respectively connected to the first output end of the second phase voltage and the first input end of the second switch component, the connection point between the sixth diode and the eighth diode is respectively connected to the second output end of the second phase voltage and the second input end of the second switch component, the output end of the second switch component is connected to the connection node between the first capacitor and the second capacitor, the cathode of the fifth diode is respectively connected to the cathode of the second diode and the cathode of the sixth diode, the anode of the fifth diode is connected to the anode of the seventh diode, the anode of the seventh diode is respectively connected to the anode of the fourth diode and the anode of the eighth diode, and the cathode of the eighth diode is connected to the cathode of the sixth diode; The third rectifier module includes a third diode component and a third switch component, the third diode component includes a ninth diode to a twelfth diode, the connection node between the ninth diode and the eleventh diode is respectively connected to the first output end of the third phase voltage and the first input end of the third switch component, the connection node between the tenth diode and the twelfth diode is respectively connected to the second output end of the third phase voltage and the second input end of the third switch component, and the output end of the third switch component is connected to the connection node between the first capacitor and the second capacitor; One end of the first capacitor is connected to the cathode of the tenth diode, the other end of the first capacitor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the anode of the twelfth diode.

2. The circuit according to claim 1, characterized in that The first switch assembly comprises: The first triode unit, the thirteenth diode, and the fourteenth diode, wherein: The first end of the first triode unit is connected to the connection node between the first diode and the third diode, the second end of the first triode unit is connected to the connection node between the second diode and the fourth diode, the third end of the first triode unit is connected to the anode of the thirteenth diode, and the fourth end of the first triode unit is connected to the cathode of the fourteenth diode; The cathode of the thirteenth diode is connected to the anode of the fourteenth diode, and the cathode of the thirteenth diode and the anode of the fourteenth diode are both connected to the other end of the first capacitor and one end of the second capacitor.

3. The circuit according to claim 2, characterized in that The first triode unit comprises: A first triode, a second triode, a third triode, a fifteenth diode, and a sixteenth diode, wherein: The emitter of the first transistor is respectively connected to the emitter of the second transistor, the anode of the thirteenth diode and the anode of the fifteenth diode, and the collector of the first transistor is respectively connected to the connection node between the first diode and the third diode and the cathode of the sixteenth diode; The collector of the second triode is respectively connected to the cathode of the fourteenth diode, the collector of the third triode and the cathode of the sixteenth diode; The emitter of the third transistor is connected to the anode of the sixteenth diode and the connection node between the second diode and the fourth diode respectively.

4. The circuit according to claim 1, characterized in that The second switch assembly comprises The second triode unit, the seventeenth diode, the eighteenth diode, wherein: The first end of the second triode unit is connected to the connection node between the fifth diode and the seventh diode, the second end of the second triode unit is connected to the connection node between the sixth diode and the eighth diode, the third end of the second triode unit is connected to the anode of the seventeenth diode, and the fourth end of the second triode unit is connected to the cathode of the eighteenth diode; The cathode of the seventeenth diode is connected to the anode of the eighteenth diode and the anode of the fourteenth diode respectively, and the cathode of the seventeenth diode and the anode of the eighteenth diode are both connected to the other end of the first capacitor and one end of the second capacitor.

5. The circuit according to claim 4, characterized in that The second triode unit comprises The fourth triode, the fifth triode, the sixth triode, the nineteenth diode, and the twentieth diode, wherein: The emitter of the fourth triode is respectively connected to the emitter of the fifth triode, the anode of the seventeenth diode and the anode of the nineteenth diode, and the collector of the fourth triode is respectively connected to the connection node between the fifth diode and the seventh diode and the cathode of the nineteenth diode; The collector of the fifth triode is respectively connected to the cathode of the eighteenth diode, the collector of the sixth triode and the cathode of the twentieth diode; The emitter of the sixth transistor is connected to the connection node between the sixth diode and the eighth diode, and the anode of the twentieth diode respectively.

6. The circuit according to claim 1, characterized in that The three-switch assembly includes The third triode unit, the twenty-first diode, and the twenty-second diode, wherein: A first end of the third triode unit is connected to a connection node between the ninth diode and the eleventh diode, a second end of the third triode unit is connected to a connection node between the tenth diode and the twelfth diode, a third end of the third triode unit is connected to an anode of the twenty-first diode, and a fourth end of the third triode unit is connected to a cathode of the twenty-second diode; The cathode of the twenty-first diode is connected to the anode of the eighteenth diode and the anode of the twenty-second diode, and the cathode of the twenty-first diode and the anode of the twenty-second diode are both connected to the other end of the first capacitor and one end of the second capacitor.

7. The circuit according to claim 6, characterized in that The third triode unit comprises The seventh triode, the eighth triode, the ninth triode, the twenty-third diode, and the twenty-fourth diode, wherein: The emitter of the seventh triode is connected to the emitter of the eighth triode, the anode of the twenty-third diode and the anode of the twenty-first diode, and the collector of the seventh triode is connected to the cathode of the twenty-third diode and the connection node between the ninth diode and the eleventh diode respectively; The collector of the eighth triode is respectively connected to the cathode of the twenty-second diode, the collector of the ninth triode and the cathode of the twenty-fourth diode; The emitter of the ninth transistor is connected to the connection node between the tenth diode and the twelfth diode, and the anode of the twenty-fourth diode respectively.

8. The circuit according to claim 1, characterized in that Also includes: A first inductor and a second inductor, wherein, One end of the first inductor is connected to the first output end of the first phase voltage, and the other end of the first inductor is respectively connected to the connection node between the first diode and the third diode, the collector of the first transistor, and the cathode of the fifteenth diode; One end of the second inductor is connected to the second output end of the first phase voltage and one end of the first inductor, and the other end of the second inductor is connected to the connection node between the second diode and the fourth diode, the emitter of the third transistor and the anode of the sixteenth diode.

9. The circuit according to claim 8, characterized in that Also includes: The third inductor and the fourth inductor, where One end of the third inductor is connected to the first output end of the second phase voltage, and the other end of the third inductor is connected to the connection node between the fifth diode and the seventh diode, the collector of the fourth transistor and the cathode of the nineteenth diode; One end of the fourth inductor is connected to one end of the third inductor and the second output end of the second phase voltage, and the other end of the fourth inductor is respectively connected to the connection node between the sixth diode and the eighth diode, the emitter of the sixth transistor and the anode of the twentieth diode.

10. The circuit according to claim 9, characterized in that Also includes: The fifth inductor and the sixth inductor, wherein, One end of the fifth inductor is connected to the first output end of the third phase voltage, and the other end of the fifth inductor is connected to the connection node between the ninth diode and the eleventh diode, the collector of the seventh transistor, and the cathode of the twenty-third diode; One end of the sixth inductor is connected to the second output end of the third phase voltage and one end of the fifth inductor, and the other end of the sixth inductor is connected to the connection node between the tenth diode and the twelfth diode, the emitter of the ninth transistor and the anode of the twenty-fourth diode.

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