CN112865566A - Single-phase three-level rectifier with three switching tubes - Google Patents

Single-phase three-level rectifier with three switching tubes Download PDF

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Publication number
CN112865566A
CN112865566A CN202110119642.3A CN202110119642A CN112865566A CN 112865566 A CN112865566 A CN 112865566A CN 202110119642 A CN202110119642 A CN 202110119642A CN 112865566 A CN112865566 A CN 112865566A
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diode
voltage
node
inductance
switch tube
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CN112865566B (en
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马辉
敬成
徐甜川
刘昊邦
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without 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
    • H02M7/217—Conversion of ac power input into dc power output without 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
    • H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • 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

Abstract

A single-phase three-level rectifier with three switching tubes comprises 3 full-control power switching tubes S1、S2、S3AC power supply UgInductor L1、L2(ii) a AC power supply UgOne side and parallel inductor L1、L2Connected to each other by an inductance L1Switch tube S1Drain electrode and D1An anode connection forming node a; inductor L2And diode D2Cathode and S2A source forming a node b; AC power supply UgThe other side and a diode D5Anode and D6Cathode electrodeConnecting to form a node N; diode D1、D3Cathode and switch tube S2Drain and capacitor C1The positive electrode is connected to the node p; diode D2、D4Anode and switch tube S1Source and capacitor C2The negative electrode is connected with a node m; diode D7Anode, D8Cathode and split capacitor C1、C2Connected to the node n. The novel single-phase rectifier has the advantages of small quantity of switching tubes, three-level structure, relative simplicity in control, lower voltage stress of the switching tubes and the like.

Description

Single-phase three-level rectifier with three switching tubes
Technical Field
The invention relates to power conversion and single-phase active three-level rectifier topology, in particular to a pseudo-totem-pole-based three-switch tube single-phase three-level rectifier.
Background
Conventional two-level rectifiers have been in use in the factory for decades, but they have been replaced by emerging multilevel converters. The power semiconductors in conventional two-level rectifiers typically withstand and rectify the entire dc bus voltage and therefore produce significant switching losses. To improve this characteristic and allow the use of higher switching frequencies, a rectifier topology may be built using multi-level rectifiers. Multilevel converters have been widely used in various industries in recent years due to their advantages of low switching frequency, low harmonic distortion, and high power density. Under the same condition, the power factor correction circuit is designed by adopting a three-level structure, and compared with a two-level power factor circuit, the power factor correction circuit has the advantages of reducing the voltage stress of a switching tube, reducing the electromagnetic interference and the like due to the fact that the level number of the power factor correction circuit is increased.
Disclosure of Invention
The invention provides a single-phase three-level rectifier with a three-switch tube. The rectifier realizes the combination of a totem-pole structure and multiple levels by only using three switching tubes, so that the harmonic content is low, and the voltage stress of the switching tubes is low. The method has the advantages of realizing larger power, being relatively simple to control and the like.
The technical scheme adopted by the invention is as follows:
a single-phase three-level rectifier with a three-switch tube, the rectifier comprising:
switch tube S1、S2、S3Diode D1～D8Inductance L1、L2Capacitor C1、C2；
Switch tube S1Drain electrodes respectively connected with the diodes D1Anode, inductor L1One end is connected, and the connecting node of the end is formed into a node a;
diode D2The cathode is connected to the switch tube S2Source electrode, inductor L2One end is connected, and the connection node of the end is formed into a node b;
inductor L1Another terminal, an inductance L2The other ends are connected with an alternating current power supply UgOne end;
AC power supply UgThe other end is respectively connected with a diode D5Anode, diode D6The cathodes are connected, and the connection node of the cathodes forms a node N;
diode D1The cathode is connected to the switch tube S2Drain electrode, diode D3Cathode and capacitor C1One end is connected, and the connection node of the end is formed into a node p;
switch tube S1Source electrodes respectively connected with the diodes D2Anode, diode D4Anode and capacitor C2The other end is connected, and the connecting node forms a node m;
capacitor C1The other end is respectively connected with a diode D7Anode, diode D8Cathode and capacitor C2One end is connected, and the connection node of the end is formed into a node n;
switch tube S3Drain electrodes respectively connected with the diodes D5Cathode, diode D3Anode, diode D7Connecting a cathode; switch tube S3Source electrodes respectively connected with the diodes D4Cathode, diode D6Anode, diode D8Connecting an anode;
load RLThe two ends are respectively connected with the node p and the node m.
The diode D1、D2Switching tube S1、S2Inductance L1、L2Forming a pseudo totem-pole structure.
The capacitor C1、C2The split capacitors are connected in series with a direct current bus.
The switch tube S1、S2、S3The power device is a full-control power device transistor IGBT or an electric field effect transistor MOSFET; switch tube S1、S2、S3Are connected in anti-parallel with diodes.
The invention relates to a pseudo-totem-pole-based three-switch tube single-phase three-level rectifier, which has the following beneficial effects:
1) the rectifier of the invention fuses the diode and full-controlled device, possess the structure of pseudo totem pole, the invention applies to the structural unit of the bidirectional switch tube, the bidirectional switch is by diode D5、D6、D7、D8Switching tube S3Composition, its main function lies in realizing +/-0.5UdcA voltage flow path. The topology of the invention has the characteristics of boosting, rectifying and three-level power factor correction.
2) The rectifier topology has a pseudo totem-pole unit structure, and can be used as a three-level modularized power unit structure based on a pseudo totem-pole unit module.
3) The rectifier of the invention is integrated with a pseudo totem-pole three-level structure in a unit power factor correction topological structure, a boosting process is introduced in the rectifier topological structure, and the structure of the rectifier is modularized by using a fusion technology of a fully-controlled device and an uncontrolled device. In addition, two inductors of the topological structure correspond to two bridge arms, so that the power output of the rear stage can be still realized under the condition that one bridge arm fails, the failure loss is reduced to a certain degree, and the working reliability of the single-phase three-level power factor correction circuit is improved. Noise generated in the switching process is reduced, the reliability of a switching device is improved, and the service life of a power switching tube is prolonged;
4) the rectifier provides a pseudo totem-pole three-level structure with the diode and the full-control device fused, and the pseudo totem-pole three-level structure has the advantages of high reliability, small common-mode interference, high working efficiency, simple control system design and the like, so that the switching loss is reduced to a certain extent, and a larger power grade can be realized.
5) The rectifier topology of the invention adopts fewer switching tubes and diodes to realize multi-level, only three switching tubes and eight diodes are adopted to realize pseudo-totem-pole multi-level, and the cost and the circuit volume are reduced compared with the traditional multi-level.
6) The converter provided by the rectifier has six working modes in an alternating current input period, and at most one switching tube in the six modes of the topological structure is in a conducting state.
7) The pseudo-totem-pole three-switch tube single-phase three-level rectifier topology provided by the invention has the advantages of simultaneously realizing larger power and small common mode interference. Meanwhile, the number of switching tubes used by the rectifier is reduced, so that the control is relatively simple. The topological direct-current side split capacitor can realize self-balancing of voltage, an additional self-balancing circuit is not needed, and the topological structure of the circuit is further simplified.
Drawings
FIG. 1 is a diagram of the main topology of the present invention.
FIG. 2 is a first diagram illustrating the operation mode of the present invention;
FIG. 3 is a diagram of the second mode of operation of the present invention;
FIG. 4 is a third diagram of the operation mode of the present invention;
FIG. 5 is a fourth illustration of the mode of operation of the present invention;
FIG. 6 is a fifth working mode diagram of the present invention;
fig. 7 is a sixth working mode diagram of the present invention.
FIG. 8 is a diagram of the pulse distribution of the present invention.
FIG. 9(a) shows a steady-state AC input voltage U according to the present inventiongAC input current igA waveform diagram;
FIG. 9(b) shows the steady-state output voltage U of the present inventionaNA waveform diagram;
FIG. 9(c) shows the steady-state output voltage U of the present inventionbNA waveform diagram;
FIG. 9(d) shows the steady-state output voltage U of the present inventiondcAnd (4) waveform diagrams.
FIG. 10 shows a switching tube switching pulse voltage U according to the present inventiong1、Ug2、Ug3And (4) waveform diagrams.
FIG. 11(a) shows an inductor L according to the present invention1Current iL1A waveform diagram;
FIG. 11(b) shows an inductor according to the present inventionL2Current iL2And (4) waveform diagrams.
FIG. 12 shows a DC split capacitor C according to the present invention1、C2Voltage U ofC1、UC2And (4) waveform diagrams.
Detailed Description
As shown in fig. 1, a pseudo totem-pole based single-phase three-level rectifier with three switching tubes comprises: switch tube S1、S2、S3Diode D1～D8Inductance L1、L2Capacitor C1、C2；
Inductor L2And diode D2Cathode and S2The source electrodes are connected, and the connection nodes of the source electrodes are connected to form a node b;
AC power supply UgThe other side and a diode D5Anode and D6The cathodes are connected, and the connection node of the cathodes forms a node N;
switch tube S2Drain and capacitor C1The anodes are connected, and the connection node of the anodes forms a node p;
diode D2、D4Anode and switch tube S1Source and capacitor C2The negative electrode is connected to the point m;
diode D7Anode, D8Cathode and split capacitor C1Negative electrode, C2The anodes are connected, and the connection node of the anodes forms a node n;
switch tube S3Drain and diode D5、D7Cathode is connected to S3Source and diode D6、D8The anodes are connected to form a bidirectional switch;
load RLConnected between the node p and the node m;
left diode D of the rectifier1、D2Switching tube S1、S2Inductance L1、L2Forming a pseudo totem-pole structure.
The capacitor C1、C2The split capacitors are connected in series with a direct current bus. The split capacitor is formed by connecting two capacitors with the same capacitance value in series, and the series connection of the capacitorsThe capacity is equal, the voltage of the two series capacitors can be obtained by the voltage division of the DC side capacitor, and the two series capacitors are DC voltages U respectivelydcHalf, forming a midpoint of half of the bus voltage, which functions to achieve + -0.5UdcThe level changes.
The switch tube S1、S2、S3The fully-controlled power device includes, but is not limited to, an Insulated Gate Bipolar Transistor (IGBT), a power field effect transistor (MOSFET), etc.
Switch tube S1、S2、S3Are connected in anti-parallel with diodes.
When switching tube S1、S2To a diode, and a diode D1、D2After the switching tube is replaced, similar to the invention, the pseudo totem-pole type three-switching tube single-phase three-level rectifier can also be realized.
The specific circuit parameters are as follows: the input side voltage of the rectifier has an effective value of 220V, a frequency of 50Hz, a switching frequency of 20kHz, and a DC side output voltage Udc400V, inductance L1＝L23mH, direct-side capacitance C1＝C2＝4700μF。
A pseudo-totem-pole-based three-switch tube single-phase three-level rectifier comprises the following working modes:
(1) the first working mode is as follows: as shown in fig. 2, the circuit operates in the positive half-cycle of the mains voltage, in which mode the switching tube S is switched1Conducting, diode D4、D6Conducting and turning off the rest semiconductor devices; capacitor C1、C2And a load RLForming a loop and applying a voltage to the load RLAnd (5) supplying power. AC power supply UgTo the inductance L1Charging, inductance L1Stored energy, current i thereofL1The linearity increases, the circuit now acting as a boost circuit. Voltage U in this operating modeaN0V, switching tube S3Drain-source voltage Uds＝Udc/2。
(2) And a second working mode: as shown in fig. 3, the circuit operates in the positive half-cycle of the mains voltage, in which mode the switching tube S is switched3Conduction, S2Body diode on, diode D1、D6、D7Conducting and turning off the rest semiconductor devices; inductor L1、L2Discharge pair capacitor C1Charging, capacitance C2To the load RLAnd (5) supplying power. When the network voltage Ug>UdcAt/2, inductance L1Charging with a current iL1Increasing; when the network voltage Ug<UdcAt/2, inductance L1Discharge of current iL1And decreases. Voltage U in this operating modeaN＝Udc/2, switching tube S1Drain-source voltage Uds＝Udc。
(3) And a third working mode: as shown in fig. 4, the circuit operates in the positive half-cycle of the mains voltage, in which mode the switching tube S is switched2Body diode on, diode D1、D4、D6Conducting and turning off the rest semiconductor devices; inductor L1、L2Discharge of current iL1、iL2Reduction of the capacitance C1、C2Charging while simultaneously applying a voltage to a load RLAnd (5) supplying power. Voltage U in this operating modeaN＝UdcSwitching tube S1Drain-source voltage Uds＝Udc。
(4) And a fourth working mode: as shown in fig. 5, the circuit operates in the negative half-cycle of the mains voltage, in which mode the switching tube S is switched2Conducting, diode D3、D5Conducting and turning off the rest semiconductor devices; capacitor C1、C2And a load RLForming a loop and applying a voltage to the load RLAnd (5) supplying power. AC power supply UgTo the inductance L2Charging, inductance L2Stored energy, current i thereofL2Increasing linearly. Voltage U in this operating modebN＝0V。
(5) And a fifth working mode: as shown in fig. 6, the circuit operates in the negative half-cycle of the mains voltage, in which mode the switching tube S is switched3Conduction, S1Body diode on, diode D2、D5、D8Conducting and turning off the rest semiconductor devices; inductor L1、L2Discharge pair capacitor C2Charging, capacitance C1To negativeR carriesLAnd (5) supplying power. Uu when power grid voltage amplitude valueg︱>UdcAt/2, inductance L2Charging with a current iL2Increasing; uu when power grid voltage amplitude valueg︱<UdcAt/2, inductance L2Discharge of current iL2And decreases. Voltage U in this operating modebN＝-Udc/2, switching tube S2Drain-source voltage Uds＝Udc。
(6) And a sixth working mode: as shown in fig. 7, the circuit operates in the negative half-cycle of the grid voltage, and in this mode of operation, the switching tube S1Body diode on, diode D2、D3、D5Conducting and turning off the rest semiconductor devices; inductor L1、L2Discharge of current iL1、iL2Reduction of the capacitance C1、C2Charging while simultaneously applying a voltage to a load RLAnd (5) supplying power. At this time, the voltage U in this operation modebN＝-UdcSwitching tube S2Drain-source voltage Uds＝Udc。
According to the above analysis, different switching tube states are combined to obtain 6 modes, and each mode corresponds to one level, as shown in table 1. In the table, "1" represents on and "0" represents off.
TABLE 1 combination of six mode switch states
Figure BDA0002921512610000051
Fig. 8 is a switching tube pulse signal showing the modulation strategy of the present invention, and the vertical axis represents the per unit quantization and has a unit of 1. The specific implementation is as follows: v. ofc1、vc2、vc3、vc4Is four high-frequency carrier signals with the frequency of 20kHz and vrefIs a reference voltage. The carrier signal is compared with a reference voltage to obtain the corresponding switch state. The specific strategy is as follows:
(1) when 0.5<vref<1 time, vrefAnd vc1By comparison, if vref>vc1The circuit is operated atWorking mode 3, switching tube S1、S2、S3Are not turned on, otherwise, if vref<vC1The circuit works in a working mode 2, and the switch tube S3Conducting S1、S2Is not conducted;
(2) when 0 is present<vref<At 0.5, vrefAnd vc2By comparison, if vref>vc2The circuit works in a working mode 2, and the switch tube S3Conducting S1、S2Not conducting, otherwise, if vref<vc2The circuit works in a working mode 1, and the switch tube S1Conducting S2、S3Is not conducted;
(3) when-0.5<vref<At 0, vrefAnd vc2By comparison, if vref>vc3The circuit works in a working mode 4, and the switch tube S2Conducting S1、S3Not conducting, otherwise, if vref<vc3The circuit works in a working mode 5, and the switch tube S3Conducting S1、S2Is not conducted;
(4) when-1<vref<At-0.5, vrefAnd vc4By comparison, if vref>vc4The circuit works in a working mode 5, and the switch tube S3Conduction, S1、S2Not conducting, otherwise, if vref<vc3The circuit works in a working mode 6, and the switch tube S1、S2、S3Are not conductive.
Fig. 9(a), 9(b), 9(c), 9(d), 10 and 11 show experimental waveforms when a load of 80 Ω is applied in the present invention.
Fig. 9(a), 9(b), 9(c), and 9(d) show waveforms related to the steady state of the present invention.
FIG. 9(a) shows a steady state AC input voltage U according to the present inventiongThe waveform keeps changing in a sine rule; AC input current igWaveform following AC input voltage UgThe waveform is stable and approaches to a sine wave.
Fig. 9(b) and 9(c) are graphs of the steady-state output voltage of the present invention, showing that the topology realizes a three-level waveform in the steady state.
FIG. 9(d) shows the steady state output voltage U of the present inventiondcAnd after the waveform is stabilized, the voltage of the direct current bus is kept stable, namely, stable direct current voltage output is realized.
FIG. 10 shows a switching tube switching pulse voltage U according to the present inventiong1、Ug2、Ug3A waveform diagram, wherein the vertical axis is unit per unit, and the unit is 1; shows the input voltage UgThe corresponding switching pulse distributes the signal.
FIGS. 11(a) and 11(b) show two inductors L according to the present invention1、L2Current iL1、iL2And (4) waveform diagrams. Represents iL1、iL2Waveform can be stabilized, and ig＝iL1+iL2I.e. iL1、iL2After confluence igA sinusoidal waveform can be realized.
FIG. 11(a) shows an inductor L according to the present invention1Current iL1Waveform diagram showing the inductance L when the circuit is operating in the positive half-cycle1Current flows but since the circuit operates at 0.5UdcAnd UdcTime, switch tube S2The body diode is turned on, soL1A portion less than 0 may occur.
FIG. 11(b) shows two inductors L according to the present invention2Current iL2Waveform diagram, as described above, since the circuit operates at-0.5Udcand-UdcTime, switch tube S1The body diode is turned on, soL2A portion less than 0 may occur.
FIG. 12 shows a DC split capacitor C according to the present invention1、C2Voltage UC1、UC2The waveform diagram shows that the voltage of the split capacitor on the direct current side can achieve self balance without an additional voltage self-balancing circuit.
In conclusion, analysis of simulation results shows that the topology of the invention can basically realize unit power factor and has better stability.

Claims (5)

1. A single-phase three-level rectifier of a kind of three switching tube, characterized by that the rectifier includes:
switch tube S1、S2、S3Diode D1～D8Inductance L1、L2Capacitor C1、C2；
Switch tube S1Drain electrodes respectively connected with the diodes D1Anode, inductor L1One end is connected, and the connecting node of the end is formed into a node a;
diode D2The cathode is connected to the switch tube S2Source electrode, inductor L2One end is connected, and the connection node of the end is formed into a node b;
inductor L1Another terminal, an inductance L2The other ends are connected with an alternating current power supply UgOne end;
AC power supply UgThe other end is respectively connected with a diode D5Anode, diode D6The cathodes are connected, and the connection node of the cathodes forms a node N;
diode D1The cathode is connected to the switch tube S2Drain electrode, diode D3Cathode and capacitor C1One end is connected, and the connection node of the end is formed into a node p;
switch tube S1Source electrodes respectively connected with the diodes D2Anode, diode D4Anode and capacitor C2The other end is connected, and the connecting node forms a node m;
capacitor C1The other end is respectively connected with a diode D7Anode, diode D8Cathode and capacitor C2One end is connected, and the connection node of the end is formed into a node n;
switch tube S3Drain electrodes respectively connected with the diodes D5Cathode, diode D3Anode, diode D7Connecting a cathode; switch tube S3Source electrodes respectively connected with the diodes D4Cathode, diode D6Anode, diode D8Connecting an anode;
load RLThe two ends are respectively connected with the node p and the node m.
2. The single-phase three-level rectifier of claim 1, wherein: the diode D1、D2Switching tube S1、S2Inductance L1、L2Forming a pseudo totem-pole structure.
3. The single-phase three-level rectifier of claim 1, wherein: the capacitor C1、C2The split capacitors are connected in series with a direct current bus.
4. The single-phase three-level rectifier of claim 1, wherein: the switch tube S1、S2、S3The power device is a full-control power device transistor IGBT or an electric field effect transistor MOSFET; switch tube S1、S2、S3Are connected in anti-parallel with diodes.
5. The single-phase three-level rectifier of claim 1, 2, 3 or 4, wherein: the method comprises the following 6 working modes:
(1) the first working mode is as follows: the circuit works in the positive half period of the network voltage, and the switch tube S is switched in the working mode1Conducting, diode D4、D6On, the capacitance C1、C2And a load RLForming a loop and applying a voltage to the load RLSupplying power; AC power supply UgTo the inductance L1Charging, inductance L1Stored energy, current i thereofL1The linear increase, the circuit now behaves as a boost circuit; voltage U in this operating modeaN0V, switching tube S3Drain-source voltage Uds＝Udc/2；
(2) And a second working mode: the circuit works in the positive half period of the network voltage, and the switch tube S is switched in the working mode3Conduction, S2Body diode on, diode D1、D6、D7Conduction, inductance L1、L2Discharge pair capacitor C1Charging, capacitance C2To the load RLSupplying power; when the network voltage Ug>UdcAt/2, inductance L1Charging with a current iL1Increasing; when the network voltage Ug<UdcAt/2, inductance L1Discharge of current iL1Decrease; voltage U in this operating modeaN＝Udc/2, switching tube S1Drain-source voltage Uds＝Udc；
(3) And a third working mode: the circuit works in the positive half period of the network voltage, and the switch tube S is switched in the working mode2Body diode on, diode D1、D4、D6Conduction, inductance L1、L2Discharge of current iL1、iL2Reduction of the capacitance C1、C2Charging while simultaneously applying a voltage to a load RLSupplying power; voltage U in this operating modeaN＝UdcSwitching tube S1Drain-source voltage Uds＝Udc；
(4) And a fourth working mode: the circuit works in the negative half period of the network voltage, and the switch tube S is switched in the working mode2Conducting, diode D3、D5On, the capacitance C1、C2And a load RLForming a loop and applying a voltage to the load RLSupplying power; AC power supply UgTo the inductance L2Charging, inductance L2Stored energy, current i thereofL2A linear increase; voltage U in this operating modebN＝0V；
(5) And a fifth working mode: the circuit works in the negative half period of the network voltage, and the switch tube S is switched in the working mode3Conduction, S1Body diode on, diode D2、D5、D8Conduction, inductance L1、L2Discharge pair capacitor C2Charging, capacitance C1To the load RLSupplying power; uu when power grid voltage amplitude valueg︱>UdcAt/2, inductance L2Charging with a current iL2Increasing; uu when power grid voltage amplitude valueg︱<UdcAt/2, inductance L2Discharge of current iL2Decrease; voltage U in this operating modebN＝-Udc/2, switching tube S2Drain-source voltage Uds＝Udc；
(6) And a sixth working mode: operation of the circuitIn the negative half period of the network voltage, the mode of operation, the switching tube S1Body diode on, diode D2、D3、D5Conduction, inductance L1、L2Discharge of current iL1、iL2Reduction of the capacitance C1、C2Charging while simultaneously applying a voltage to a load RLSupplying power; at this time, the voltage U in this operation modebN＝-UdcSwitching tube S2Drain-source voltage Uds＝Udc。
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