CN219372307U - Three-level dual-output topology adopting fifteen switches - Google Patents
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Abstract
The utility model discloses a three-level double-output topology adopting fifteen switches, which comprises a direct current power supply, 2 series capacitors and 15 switch modules, wherein the input end of the direct current power supply is connected to the side of the direct current power supply, each 5 switch modules form a bridge arm, and the 5 switch modules are connected in series in an opposite direction and comprise a switch group consisting of 2 switch modules; the utility model outputs two groups of three-phase voltages through inversion based on a group of direct current input voltages; two groups of three-phase loads are carried by the two output ends; the 15 switch modules in the topological structure adopt PWM modulation control to realize the stabilization of output voltage; the method is mainly applied to occasions requiring medium-high voltage high-power inversion. The utility model has simple structure, volume optimization, large element capacity and high economic benefit, can be widely applied to the fields of electric automobiles, wind power generation systems, solar power generation systems and the like, and has remarkable effect.
Description
Technical Field
The utility model belongs to the technical field of power electronics, and particularly relates to a three-level dual-output topology adopting fifteen switches.
Background
Along with the rapid development of industry, the application of the three-level inverter in the technical field of power electronics in industrial production and life is wider, and the three-level inverter is particularly applied to the field of medium-high voltage high-power inversion. The three-level inversion topology is widely accepted and applied by the expert in the industry because of the advantages of high voltage withstand level, small voltage and current distortion, simple modulation of a switch module and the like in practical application. The advent of three-level dual-output inverter topologies provides a solution for applications where multiple medium-high voltage high power inverter requirements are present at the same time, as compared to three-level single-output inverter topologies. For the existing typical three-level dual-output topology, the problems of larger volume, higher control cost and the like are caused by more switching elements, and the three-level dual-output topology adopting fifteen switches can optimize the problems and achieve a considerable inversion effect.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: for the existing typical three-level dual-output topology, the problems of larger volume, higher control cost and the like are caused by the fact that the number of switching elements is large.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a three-level dual-output topology adopting fifteen switches comprises a direct current power supply Udc, a capacitor C1, a capacitor C2, a switch module Sa1, a switch module Sb1, a switch module Sc1, a switch module Sa2, a switch module Sb2, a switch module Sa3, a switch module Sb3, a switch module Sc3, a switch module Sa4, a switch module Sb4, a switch module Sc4, a switch module Sa5, a switch module Sb5, a switch module Sc5, a load Z1, a load Z2, a load Z3, a load Z4, a load Z5 and a load Z6;
the positive electrode of the direct current power supply Udc is connected with the positive electrode of the capacitor C1, the negative electrode of the direct current power supply Udc is connected with the negative electrode of the capacitor C2, and the negative electrode of the capacitor C1 is connected with the positive electrode of the capacitor C2;
the connection point of the capacitor C1 and the capacitor C2 is respectively connected with one ends of the switch module Sa2, the switch module Sb2 and the switch module Sc 2; the other end of the switch module Sa2 is connected with the other end of the switch module Sa3, and one end of the switch module Sa3 is respectively connected with the other end of the switch module Sa1 and one end of the switch module Sa 4; the other end of the switch module Sb2 is connected with the other end of the switch module Sb3, and one end of the switch module Sb3 is respectively connected with the other end of the switch module Sb1 and one end of the switch module Sb 4; the other end of the switch module Sc2 is connected with the other end of the switch module Sc3, and one end of the switch module Sc3 is respectively connected with the other end of the switch module Sc1 and one end of the switch module Sc 4;
the other end of the switch module Sa4 is connected with one end of the switch module Sa5, the other end of the switch module Sb4 is connected with one end of the switch module Sb5, and the other end of the switch module Sc4 is connected with one end of the switch module Sc 5;
one end of the switch module Sa1, one end of the switch module Sb1 and one end of the switch module Sc1 are connected with the positive electrode of the capacitor C1, and the other end of the switch module Sa5, one end of the switch module Sb5 and one end of the switch module Sc5 are connected with the negative electrode of the capacitor C2;
the connection between the other end of the switch module Sa1 and one end of the switch module Sa4, the connection between the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection between the other end of the switch module Sc1 and one end of the switch module Sc4 form an upper output port; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 form a lower output port;
the connection part of the other end of the switch module Sa1 and one end of the switch module Sa4, the connection part of the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection part of the other end of the switch module Sc1 and one end of the switch module Sc4 are respectively connected with one ends of a load Z1, a load Z2 and a load Z3, and the other ends of the load Z1, the load Z2 and the load Z3 are connected; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 are respectively connected with one ends of the load Z4, the load Z5, and the load Z6, and the other ends of the load Z4, the load Z5, and the load Z6 are connected.
Preferably, the structures of the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5, sc5 are the same, and all the switch modules include insulated gate bipolar transistors and diodes; an emitter of the insulated gate bipolar transistor is connected with an anode of the diode, and a collector of the insulated gate bipolar transistor is connected with a cathode of the diode; the emitter of the insulated gate bipolar transistor in the switch module is defined as the other end of the switch module, and the collector of the insulated gate bipolar transistor in the switch module is defined as one end of the switch module.
Preferably, the structures of the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5, sc5 are the same, and all the switch modules include MOS tubes and diodes; the source electrode of the MOS tube is connected with the positive electrode of the diode, and the drain electrode of the MOS tube is connected with the negative electrode of the diode; the source electrode of the MOS tube in the switch module is defined as the other end of the switch module, and the drain electrode of the MOS tube in the switch module is defined as one end of the switch module.
The beneficial effects of the utility model are as follows: the utility model discloses a three-level double-output topology adopting fifteen switches, which comprises a direct current power supply, 2 series capacitors and 15 switch modules, wherein the input end of the direct current power supply is connected to the side of the direct current power supply, each 5 switch modules form a bridge arm, and the 5 switch modules are provided with a switch group formed by 2 switch modules in reverse series connection; the utility model outputs two groups of three-phase voltages through inversion based on a group of direct current input voltages; two groups of three-phase loads are carried by the two output ends; the 15 switch modules in the topological structure adopt PWM modulation control to realize the stabilization of output voltage; the scheme is mainly applied to the field of medium-high voltage high-power inversion, adopts fewer switching elements to construct a three-level double-output topological inverter, can output two groups of three-phase alternating voltages through inversion by using one group of direct-current input voltages, and has great advantages in the driving application field of double motors. The utility model optimizes the volume of the equipment system, reduces the production cost, and correspondingly reduces the switching loss due to the reduction of the switching module, thereby improving the system efficiency; the corresponding control strategy is simpler, the complexity of the system is reduced, and the reliability of the system is improved; the method can be widely applied to the fields of electric automobiles, wind power generation systems, solar power generation systems and the like, and has remarkable effect.
Drawings
FIG. 1 is a schematic diagram of the topology of the present utility model;
fig. 2 (a) is a schematic diagram of an effective switching state 1 of a bridge arm including a Sa switching module according to the present utility model;
fig. 2 (b) is a schematic diagram of an effective switching state 2 of a bridge arm including a Sa switching module according to the present utility model;
fig. 2 (c) is a schematic diagram of an effective switching state 3 of a bridge arm including a Sa switching module according to the present utility model;
fig. 2 (d) is a schematic diagram of an effective switching state 4 of a bridge arm including a Sa switching module according to the present utility model;
fig. 2 (e) is a schematic diagram of an effective switching state 5 of a bridge arm including a Sa switching module according to the present utility model;
FIG. 3 is a schematic diagram of the phase voltages of the respective loads at the output ports of the present utility model;
FIG. 4 is a schematic diagram of the phase voltages of the respective loads at the output ports according to the present utility model;
FIG. 5 is a schematic diagram of the line voltage between the load Z1 and the load Z2 at the output port according to the present utility model;
FIG. 6 is a schematic diagram of the line voltage between the output port load Z4 and the load Z5 according to the present utility model;
FIG. 7 is a schematic diagram of the current waveform of the upper output port of the present utility model;
fig. 8 is a schematic diagram of current waveforms of the output port according to the present utility model.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples will provide those skilled in the art with a more complete understanding of the utility model, but are not intended to limit the utility model in any way.
As shown in fig. 1, a three-level dual-output topology using fifteen switches includes a dc power supply Udc, a capacitor C1, a capacitor C2, a switch module Sa1, a switch module Sb1, a switch module Sc1, a switch module Sa2, a switch module Sb2, a switch module Sa3, a switch module Sb3, a switch module Sa4, a switch module Sb4, a switch module Sc4, a switch module Sa5, a switch module Sb5, a switch module Sc5, a load Z1, a load Z2, a load Z3, a load Z4, a load Z5, and a load Z6.
In this embodiment, the structures of the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5, sc5 are the same, and all the switch modules include insulated gate bipolar transistors and diodes, and each switch module is composed of an insulated gate bipolar transistor and an antiparallel diode; an emitter of the insulated gate bipolar transistor is connected with an anode of the diode, and a collector of the insulated gate bipolar transistor is connected with a cathode of the diode; the emitter of the insulated gate bipolar transistor in the switch module is defined as the other end of the switch module, namely the emitter of the switch module; the collector of the insulated gate bipolar transistor in the switching module is defined as one end of the switching module, i.e. as the collector of the switching module. The positive electrode of the direct current power supply Udc is connected with the positive electrode of the capacitor C1, the negative electrode of the direct current power supply Udc is connected with the negative electrode of the capacitor C2, and the negative electrode of the capacitor C1 is connected with the positive electrode of the capacitor C2; in a capacitor C1 and a capacitor C2 with voltage source property, which are connected by a direct current power supply Udc, a connection point between the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2 is defined as a neutral point, and the potential is 0; the voltage between the positive pole of the direct current power supply Udc and the neutral point is Udc/2, and the voltage between the neutral point and the negative pole of the direct current power supply Udc is Udc/2.
The connection point of the capacitor C1 and the capacitor C2 is respectively connected with one ends of the switch module Sa2, the switch module Sb2 and the switch module Sc 2; the other end of the switch module Sa2 is connected with the other end of the switch module Sa3, and one end of the switch module Sa3 is respectively connected with the other end of the switch module Sa1 and one end of the switch module Sa 4; the other end of the switch module Sb2 is connected with the other end of the switch module Sb3, and one end of the switch module Sb3 is respectively connected with the other end of the switch module Sb1 and one end of the switch module Sb 4; the other end of the switch module Sc2 is connected with the other end of the switch module Sc3, and one end of the switch module Sc3 is respectively connected with the other end of the switch module Sc1 and one end of the switch module Sc 4;
the other end of the switch module Sa4 is connected with one end of the switch module Sa5, the other end of the switch module Sb4 is connected with one end of the switch module Sb5, and the other end of the switch module Sc4 is connected with one end of the switch module Sc 5;
one end of the switch module Sa1, one end of the switch module Sb1 and one end of the switch module Sc1 are connected with the positive electrode of the capacitor C1, and the other end of the switch module Sa5, one end of the switch module Sb5 and one end of the switch module Sc5 are connected with the negative electrode of the capacitor C2;
in the embodiment, 15 switch modules in the topological structure are connected into the base electrode of each switch module through PWM modulation control, namely the base electrode of an insulated gate bipolar transistor, so that stable control of output voltage is realized; the connection between the other end of the switch module Sa1 and one end of the switch module Sa4, the connection between the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection between the other end of the switch module Sc1 and one end of the switch module Sc4 form an upper output port; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 form a lower output port;
the connection part of the other end of the switch module Sa1 and one end of the switch module Sa4, the connection part of the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection part of the other end of the switch module Sc1 and one end of the switch module Sc4 are respectively connected with one ends of a load Z1, a load Z2 and a load Z3, the other ends of the load Z1, the load Z2 and the load Z3 are connected, and the load Z1, the load Z2 and the load Z3 respectively correspond to the output A phase, the output B phase and the output C phase; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 are respectively connected with one ends of the load Z4, the load Z5 and the load Z6, the other ends of the load Z4, the load Z5 and the load Z6 are connected, and the load Z4, the load Z5 and the load Z6 respectively correspond to the output X phase, the output Y phase and the output Z phase. That is, the junction between the emitter of the switch module Sa1 and the collector of the switch module Sa3 and the collector of the switch module Sa4 is connected to the load Z1, the junction between the emitter of the switch module Sb1 and the collector of the switch module Sb3 and the collector of the switch module Sb4 is connected to the load Z2, and the junction between the emitter of the switch module Sc1 and the collector of the switch module Sc3 and the collector of the switch module Sc4 is connected to the load Z3. A load Z4 is connected to the junction of the emitter of the switch module Sa4 and the collector of the switch module Sa5, and a load Z5 is connected to the junction of the emitter of the switch module Sb4 and the collector of the switch module Sb 5; a load Z6 is connected to the junction of the emitter of the switching module Sc4 and the collector of Sc 5.
In another embodiment, the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5, sc5 have the same structure, and all the switch modules include MOS transistors and diodes; the source electrode of the MOS tube is connected with the positive electrode of the diode, and the drain electrode of the MOS tube is connected with the negative electrode of the diode; the source electrode of the MOS tube in the switch module is defined as the other end of the switch module, and the drain electrode of the MOS tube in the switch module is defined as one end of the switch module. In this embodiment, an N-type silicon carbide MOS transistor (SiC MOSFET) is used. The switch module of this scheme can also adopt the device of other circuit break-make effect. In this embodiment, the 15 switch modules in the topology structure are connected to the gates of the switch modules, that is, the gates of the MOS transistors, through PWM modulation control, so as to realize stable control of the output voltage.
The scheme comprises 15 switch modules, wherein every 5 switch modules form a bridge arm, namely each Sa switch module forms a bridge arm, each Sb switch module forms a bridge arm, and each Sc switch module forms a bridge arm; each bridge arm is provided with a switch group (Sa 2 and Sa3, sb2 and Sb3, sc2 and Sc 3) formed by 2 switch modules in reverse series connection; the scheme is based on a group of direct current input voltages to output two groups of three-phase voltages through inversion; two output terminals carry two groups of three-phase loads.
When the topology circuit is in the working mode, 5 effective working states or switch combinations of each bridge arm are provided, and the other two bridge arms are the same in principle, and the switch states of the switch modules are compared with the effective working states (taking a bridge arm with a Sa switch module as an example) as shown in the table 1. The schematic diagrams of the switching states of the bridge arms corresponding to table 1 are shown in fig. 2 (a) -2 (e).
TABLE 1
| State 1 | State 2 | State 3 | State 4 | State 5 | |
| Sa1 | ON | ON | OFF | OFF | OFF |
| Sa2 | ON | ON | ON | ON | OFF |
| Sa3 | OFF | OFF | ON | ON | ON |
| Sa4 | ON | OFF | ON | OFF | ON |
| Sa5 | OFF | ON | OFF | ON | ON |
| Upper output port level | Udc/2 | Udc/2 | 0 | 0 | -Udc/2 |
| Lower output port level | Udc/2 | -Udc/2 | 0 | -Udc/2 | -Udc/2 |
Wherein: the state of the switch module is ON when being closed, the state of the switch module is OFF when being opened, and 15 switch modules in the topological structure adopt PWM modulation control to realize the stability of output voltage.
In order to verify the effectiveness of the circuit, the embodiment carries out simulation through MATLAB/simulink, and simulation parameters are as follows: setting the voltage at the direct current side to 800V; the frequencies are 50Hz; three-phase loads output by the inverter are all 10 omega in resistance and 1mH in inductance; the simulation waveform diagram 3 is the phase voltage of each load of the upper output port, and the simulation waveform diagram 4 is the phase voltage of each load of the lower output port; the simulation waveform diagram 5 is the line voltage between the load Z1 and the load Z2 of the upper output port; the simulation waveform diagram 6 is the line voltage between the load Z4 and the load Z5 of the lower output port; the simulated waveform diagram 7 shows the current waveform of the upper output port, and the simulated waveform diagram 8 shows the current waveform of the lower output port. Through the simulation, the effectiveness and feasibility of the topology of the utility model are verified under the modulation control of PWM.
The utility model designs a three-level double-output topology adopting fifteen switches, which comprises a direct current power supply, 2 series capacitors and 15 switch modules, wherein the input end of the direct current power supply is connected to the side of the direct current power supply, each 5 switch modules form a bridge arm, and the 5 switch modules are provided with a switch group formed by 2 switch modules in reverse series connection; the utility model outputs two groups of three-phase voltages through inversion based on one group of direct current input voltages, and two groups of three-phase loads are carried by two output ends; the 15 switch modules in the topological structure adopt PWM modulation control to realize the stabilization of output voltage; the scheme is mainly applied to the field of medium-high voltage high-power inversion, adopts fewer switching elements to construct a three-level double-output topological inverter, can output two groups of three-phase alternating voltages through inversion by using one group of direct-current input voltages, and has great advantages in the driving application field of double motors. The utility model has simple structure, volume optimization, large element capacity and high economic benefit, can output two groups of three-phase voltages by inverting one group of direct current input voltages, can be widely applied to the fields of electric automobiles, wind power generation systems, solar power generation systems and the like, and has remarkable effect.
Although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the foregoing embodiments may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.
Claims (3)
1. A three-level dual output topology employing fifteen switches, characterized by: the DC power supply comprises a DC power supply Udc, a capacitor C1, a capacitor C2, a switch module Sa1, a switch module Sb1, a switch module Sa2, a switch module Sb2, a switch module Sc2, a switch module Sa3, a switch module Sb3, a switch module Sc3, a switch module Sa4, a switch module Sb4, a switch module Sa5, a switch module Sb5, a switch module Sc5, a load Z1, a load Z2, a load Z3, a load Z4, a load Z5 and a load Z6;
the positive electrode of the direct current power supply Udc is connected with the positive electrode of the capacitor C1, the negative electrode of the direct current power supply Udc is connected with the negative electrode of the capacitor C2, and the negative electrode of the capacitor C1 is connected with the positive electrode of the capacitor C2;
the connection point of the capacitor C1 and the capacitor C2 is respectively connected with one ends of the switch module Sa2, the switch module Sb2 and the switch module Sc 2; the other end of the switch module Sa2 is connected with the other end of the switch module Sa3, and one end of the switch module Sa3 is respectively connected with the other end of the switch module Sa1 and one end of the switch module Sa 4; the other end of the switch module Sb2 is connected with the other end of the switch module Sb3, and one end of the switch module Sb3 is respectively connected with the other end of the switch module Sb1 and one end of the switch module Sb 4; the other end of the switch module Sc2 is connected with the other end of the switch module Sc3, and one end of the switch module Sc3 is respectively connected with the other end of the switch module Sc1 and one end of the switch module Sc 4;
the other end of the switch module Sa4 is connected with one end of the switch module Sa5, the other end of the switch module Sb4 is connected with one end of the switch module Sb5, and the other end of the switch module Sc4 is connected with one end of the switch module Sc 5;
one end of the switch module Sa1, one end of the switch module Sb1 and one end of the switch module Sc1 are connected with the positive electrode of the capacitor C1, and the other end of the switch module Sa5, one end of the switch module Sb5 and one end of the switch module Sc5 are connected with the negative electrode of the capacitor C2;
the connection between the other end of the switch module Sa1 and one end of the switch module Sa4, the connection between the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection between the other end of the switch module Sc1 and one end of the switch module Sc4 form an upper output port; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 form a lower output port;
the connection part of the other end of the switch module Sa1 and one end of the switch module Sa4, the connection part of the other end of the switch module Sb1 and one end of the switch module Sb4, and the connection part of the other end of the switch module Sc1 and one end of the switch module Sc4 are respectively connected with one ends of a load Z1, a load Z2 and a load Z3, and the other ends of the load Z1, the load Z2 and the load Z3 are connected; the connection between the other end of the switch module Sa4 and one end of the switch module Sa5, the connection between the other end of the switch module Sb4 and one end of the switch module Sb5, and the connection between the other end of the switch module Sc4 and one end of the switch module Sc5 are respectively connected with one ends of the load Z4, the load Z5, and the load Z6, and the other ends of the load Z4, the load Z5, and the load Z6 are connected.
2. A three-level dual output topology employing fifteen switches as recited in claim 1, wherein: the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5 and Sc5 have the same structure, and all the switch modules comprise insulated gate bipolar transistors and diodes; an emitter of the insulated gate bipolar transistor is connected with an anode of the diode, and a collector of the insulated gate bipolar transistor is connected with a cathode of the diode; the emitter of the insulated gate bipolar transistor in the switch module is defined as the other end of the switch module, and the collector of the insulated gate bipolar transistor in the switch module is defined as one end of the switch module.
3. A three-level dual output topology employing fifteen switches as recited in claim 1, wherein: the switch modules Sa1, sb1, sc1, sa2, sb2, sc2, sa3, sb3, sc3, sa4, sb4, sc4, sa5, sb5 and Sc5 have the same structure, and all the switch modules comprise MOS tubes and diodes; the source electrode of the MOS tube is connected with the positive electrode of the diode, and the drain electrode of the MOS tube is connected with the negative electrode of the diode; the source electrode of the MOS tube in the switch module is defined as the other end of the switch module, and the drain electrode of the MOS tube in the switch module is defined as one end of the switch module.
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Assignee: Jiangsu Xingyuan Intelligent Equipment Research Institute Co.,Ltd. Assignor: Jiangsu Normal University Contract record no.: X2023980047168 Denomination of utility model: A three-level dual output topology using fifteen switches Granted publication date: 20230718 License type: Common License Record date: 20231116 |