CN112865565A - Double-switch three-level rectifier of symmetrical T-shaped bridge - Google Patents

Double-switch three-level rectifier of symmetrical T-shaped bridge Download PDF

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CN112865565A
CN112865565A CN202110119630.0A CN202110119630A CN112865565A CN 112865565 A CN112865565 A CN 112865565A CN 202110119630 A CN202110119630 A CN 202110119630A CN 112865565 A CN112865565 A CN 112865565A
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diode
switch tube
power
anode
power supply
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马辉
邹旭
敬成
徐甜川
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

A double-switch three-level rectifier with symmetrical T-shaped bridges comprises two groups of symmetrical T-shaped bridges and two split capacitors C1、C2. Wherein, three bridge arms of two groups of T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes, the first T-shaped bridge comprises a diode D1、D2、D5、D6、D7、D8Power switch tube S1Diode D5、D6、D7、D8And a power switch tube S1Form a group of bidirectional power tubes. The second T-bridge comprising a diode D3、D4、D9、D10、D11、D12Power ofSwitch tube S2Diode D9、D10、D11、D12And a power switch tube S2Form a group of bidirectional power tubes. The two sets of symmetrical T-shaped bridge structures are beneficial to solving the heat dissipation problem and designing the system in a modular mode. The invention adopts different combination modes of the power switch tubes to realize the function of three levels, and even if the bidirectional tube is in a fault state, the double-switch three-level rectifier of the symmetrical T-shaped bridge can still realize the power output to the direct current side.

Description

Double-switch three-level rectifier of symmetrical T-shaped bridge
Technical Field
The invention relates to the technical field of single-phase three-level rectifiers, in particular to a double-switch three-level rectifier of a symmetrical T-shaped bridge.
Background
With the development of industry and economy, people have higher and higher requirements on power converters, and pay more attention to the green and environment-friendly performance of the power converters. Especially, due to the emergence of strict national standards, power factor and harmonic content have become factors to be considered when designing power electronic equipment. The traditional two-level topological converter adopts a diode uncontrolled rectification mode, so that serious current waveform distortion at the power grid side is caused, serious harmonic pollution is brought to the power grid, and the power factor of equipment in the mode is lower. At the same time, the bus voltage value distributed to each power device by the converter with the two-level topology is large, so that the topology is not suitable for high-voltage and large-capacity power application occasions. Therefore, multilevel converters are gaining attention and being used in high-voltage, high-capacity power applications, and are in a rapid development stage from two-level converters to multilevel converters.
Disclosure of Invention
Compared with a two-level rectifier, the double-switch three-level rectifier of the symmetrical T-shaped bridge has the advantages that the sine degree of the current waveform at the network side is better than that of the corresponding waveform of the two-level rectifier by increasing one level number, and the sine degree can still be ensured even if the switching frequency is very low; greatly improves the power factor and is beneficial to improving the power quality of the power grid.
The technical scheme adopted by the invention is as follows:
a double-switch three-level rectifier with symmetrical T-shaped bridge comprises two symmetrical T-shaped bridges and a capacitor C1、C2(ii) a The three bridge arms of the two T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes;
the first T-bridge comprising a diode D1、D2、D5、D6、D7、D8Switching tube S1Diode D5、D6、D7、D8And a switching tube S1Form a group of bidirectional power tubes.
The second T-bridge comprising a diode D3、D4、D9、D10、D11、D12Switching tube S2Diode D9、D10、D11、D12And a switching tube S2Forming a group of bidirectional power tubes;
inductor L1One end is respectively connected with a diode D1Anode, diode D5Anode, diode D2Cathode, diode D6A cathode, the connection node of which constitutes an end a;
one end of the AC power supply is respectively connected with a diode D4Cathode, diode D3Anode, diode D7Anode, diode D8Cathode, diode D9Anode, diode D10A cathode, the connection node of which constitutes an end point b;
diode D1The cathodes are respectively connected with a diode D3Cathode and capacitor C1One end, the connection node of which constitutes an endpoint p;
capacitor C1The other ends are respectively connected with a diode D11Anode, diode D12Cathode and capacitor C2One end, the connection node of which forms an endpoint n;
capacitor C2The other ends are respectively connected with a diode D4Anode, diode D2An anode, the connection node of which forms an endpoint m;
switch tube S1The drain electrodes are respectively connected with a diode D5Cathode, diode D7A cathode;
switch tube S1The source electrodes are respectively connected with a diode D6Anode, diode D8An anode;
switch tube S2The drain electrodes are respectively connected with a diode D9Cathode, diode D11A cathode;
switch tube S2The source electrodes are respectively connected with a diode D10Anode, diode D12An anode;
diode D7Anode connected diode D9An anode;
the other end of the AC power supply is connected with an inductor L1The other end;
load RLTwo ends are respectively connected with a capacitor C1One terminal, capacitor C2And the other end.
By a diode D5、D6、D7、D8And a power switch tube S1A group of bidirectional power tubes inserted between the terminals a and b and having inductance L1The charging forms a loop to realize the direct current side boosting.
By a diode D9、D10、D11、D12And a power switch tube S2A group of bidirectional power tubes inserted between the terminal b and the terminal n and composed of two split capacitors C1、C2The charging forms a loop to realize the neutral point potential balance.
The switch tube S1、S2Is an insulated gate bipolar transistor IGBT, or an integrated gate commutated thyristor IGCT, or a power field effect transistor MOSFET.
The invention discloses a double-switch three-level rectifier of a symmetrical T-shaped bridge, which has the following technical effects:
1) compared with a two-level rectifier, the two-switch three-level rectifier of the symmetrical T-shaped bridge has the advantages that the sine degree of the current waveform at the network side is better than that of the corresponding waveform of the two-level rectifier by increasing one level number, and the sine degree can still be ensured even if the switching frequency is very low.
2) The double-switch three-level rectifier of the symmetrical T-shaped bridge is provided with two groups of symmetrical T-shaped bridge structures, and is favorable for processing the heat dissipation problem and the system modular design.
3) According to the double-switch three-level rectifier of the symmetrical T-shaped bridge, three levels are realized by adopting different combination modes of the power switch tubes, and even if the bidirectional tubes are in a fault state, the circuit can still realize power output on a direct current side.
Drawings
Fig. 1 is a main topology structure diagram of a two-switch three-level rectifier of a symmetrical T-bridge according to the present invention.
Fig. 2 is a schematic diagram of a working mode of a dual-switch three-level rectifier of a symmetric T-bridge according to the present invention.
Fig. 3 is a schematic diagram of a second working mode of a dual-switch three-level rectifier of a symmetric T-bridge according to the present invention.
Fig. 4 is a schematic diagram of a three-mode operation of a two-switch three-level rectifier of a symmetric T-bridge according to the present invention.
Fig. 5 is a diagram of a four-mode operation of a two-switch three-level rectifier of a symmetrical T-bridge according to the present invention.
Fig. 6 is a five schematic diagram of the working mode of a two-switch three-level rectifier of a symmetric T-bridge according to the present invention.
Fig. 7 is a six schematic diagram of a working mode of a two-switch three-level rectifier of a symmetric T-bridge according to the present invention.
FIG. 8 shows a voltage U of an AC power supply of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventionSAnd alternating supply current iSAnd (4) waveform diagrams.
FIG. 9 shows a voltage U between a terminal a and a terminal b of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventionabAnd (4) waveform diagrams.
FIG. 10 shows a DC side voltage U of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventiondcAnd (4) waveform diagrams.
FIG. 11 shows a double-switch three-level rectifier DC-side two-split capacitor C of a symmetrical T-bridge according to the present invention1、C2Voltage U onc1、Uc2And (4) waveform diagrams.
Detailed Description
As shown in FIG. 1, a symmetrical T-bridge dual-switch three-level rectifier comprises two symmetrical T-bridges and two split capacitors C1、C2。
Wherein, three bridge arms of the two groups of T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes. The first T-bridge comprising a diode D1、D2、D5、D6、D7、D8Power switch tube S1Diode D5、D6、D7、D8And a power switch tube S1Form a group of bidirectional power tubes. The second T-bridge comprising a diode D3、D4、D9、D10、D11、D12Power switch tube S2Diode D9、D10、D11、D12And a power switch tube S2Form a group of bidirectional power tubes. Diode D1、D5Anode of (2), diode D2、D6Cathode and inductor L1Connecting, and regarding the connecting point as an end point a; diode D3、D7、D9Anode of (2), diode D4、D8、D10The cathode of the anode is connected with one end of an alternating current power supply AC, and the connection point is regarded as an end point b; diode D1、D3Cathode and split capacitor C1The positive electrodes of the two electrodes are connected, and the connection point is regarded as an end point p; diode D11Anode of (2), diode D12Cathode of (2), split capacitor C1Negative electrode and split capacitor C2The positive electrodes of the two electrodes are connected, and the connection point is regarded as an end point n; diode D2、D4Anode and split capacitor C2The negative electrodes of the two electrodes are connected, and the connection point is regarded as an end point m; diode D5Cathode of (2), diode D7Cathode and power switch tube S1Is connected to the drain of the diode D6Anode of (2), diode D8Anode and power switch tube S1Is connected to the source of a diode D9Cathode of (2), diode D11Cathode and power switch tube S2Is connected to the drain of the diode D10Anode of (2), diode D12Anode and power switch tube S2Is connected with the source electrode of the inductor L, and the other end of the alternating current power supply AC is connected with the inductor L1Connected to a load RLConnected between the end points p, m.
USIs an AC supply voltage iSFor alternating supply current, UabIs the voltage between terminal a and terminal b, UdcIs a direct current sideVoltage, Uc1And Uc2Respectively a DC side split capacitor C1、C2Voltage on, splitting capacitance C1、C2Not only stabilizes the DC side voltage, but also stores the electric energy and sends the electric energy to the load RLProviding energy.
The specific parameters of the circuit are as follows: the effective value of the AC power supply voltage is 220V, the frequency is 50Hz, and the DC side output voltage Udc400V, inductance L12.2mH, split capacitance C1＝C24700 μ F, switching frequency fs 20kHz, load RL＝80Ω。
A double-switch three-level rectifier of a symmetrical T-shaped bridge divides the whole power frequency working period into six working modes according to a carrier-wave laminated Pulse Width Modulation (PWM):
the first working mode is as follows: as shown in fig. 2, the diode D operates in the positive half cycle of the AC power source AC1、D4Conducting power switch tube S1、S2And (5) disconnecting. The current starts from the AC power supply AC and passes through the inductor L1Diode D1, split capacitor C1、C2Diode D4And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to the DC side voltage UdcSplitting capacitance C1、C2Charging, AC power supply AC and inductance L1Together to a load RLSupplying power, and linearly reducing the inductive current;
the second working mode is as follows: as shown in fig. 3, the diode D operates in the positive half cycle of the AC power source AC1、D10、D11Conducting power switch tube S2Conducting power switch tube S1And (5) disconnecting. The current starts from the AC power supply AC and passes through the inductor L1Diode D1Split capacitor C1Diode D11Power switch tube S2Diode D10And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to the DC side voltage UdcHalf of (1), split capacitance C1Charging, splitting capacitance C2Discharging if the AC supply voltage Us is higher than UdcAt/2, in this state, the inductance L1The current rises linearly if the AC supply voltage Us is less than UdcAt/2, in this state, the inductance L1The current decreases linearly;
the working mode is three: as shown in fig. 4, the diode D operates in the positive half cycle of the AC power source AC5、D8Conducting power switch tube S1Conducting power switch tube S2And (5) disconnecting. The current starts from the AC power supply AC and passes through the inductor L1Diode D5Power switch tube S1Diode D8And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to zero, split capacitance C1、C2Discharging to a load RLCharging, AC power supply gives inductance L1Charging;
working mode four: as shown in fig. 5, the diode D operates in the negative half cycle of the AC power source AC2、D3Conducting power switch tube S1、S2Is disconnected and current flows from the AC power supply AC through the diode D3Split capacitor C1、C2Diode D2Inductor L1And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to negative DC side voltage UdcSplitting capacitance C1、C2Charging, AC power supply AC and inductance L1Together to a load RLSupplying power, and linearly reducing the inductive current;
working mode five: as shown in fig. 6, the diode D operates in the negative half cycle of the AC power source AC9、D12Conducting power switch tube S2Conducting power switch tube S1Is disconnected and current flows from the AC power supply AC through the diode D9Power switch tube S2Diode D12Split capacitor C2Diode D2Inductor L1And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to the negative DC sideVoltage UdcHalf of (1), split capacitance C1Discharge, splitting capacitance C2Charging, if the absolute value of the AC supply voltage Us is higher than UdcAt/2, in this state, the inductance L1The current rises linearly; if the absolute value of the AC supply voltage Us is less than UdcAt/2, in this state, the inductance L1The current decreases linearly;
the working mode is six: as shown in fig. 7, the diode D operates in the negative half cycle of the AC power source AC6、D7Conducting power switch tube S1Conducting power switch tube S2Is disconnected and current flows from the AC power supply AC through the diode D7Power switch tube S1Diode D6Inductor L1And finally back to the AC power source AC. In this mode of operation, the voltage U between the terminals a and babEqual to zero, split capacitance C1、C2Discharging to a load RLCharging, AC power supply gives inductance L1And (6) charging.
FIG. 8 shows a voltage U of an AC power supply of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventionSAnd alternating supply current iSThe waveform diagram, the network side voltage and the current have the same frequency and the same phase, namely the unit power factor is realized, and the feasibility of the topology is proved.
FIG. 9 shows a voltage U between terminals a and b of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventionabThe oscillogram accords with the working characteristics of the three-level circuit and is consistent with theoretical analysis.
FIG. 10 shows a DC side voltage U of a two-switch three-level rectifier of a symmetrical T-bridge according to the present inventiondcThe waveform diagram shows that the voltage on the direct current side is stabilized to be about 400V, and the feasibility of the topology is proved.
FIG. 11 shows a double-switch three-level rectifier DC-side two-split capacitor C of a symmetrical T-bridge according to the present invention1、C2Voltage U onc1、Uc2The waveform diagram and the voltage waveform of the two split capacitors are dynamically balanced, and the topology is proved to effectively realize midpoint potential balance.

Claims (5)

1. The utility model provides a two switches three level rectifier of symmetry T type bridge which characterized in that: comprises two symmetrical T-shaped bridges and a capacitor C1、C2(ii) a The three bridge arms of the two T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes;
the first T-bridge comprising a diode D1、D2、D5、D6、D7、D8Switching tube S1Diode D5、D6、D7、D8And a switching tube S1Forming a group of bidirectional power tubes;
the second T-bridge comprising a diode D3、D4、D9、D10、D11、D12Switching tube S2Diode D9、D10、D11、D12And a switching tube S2Forming a group of bidirectional power tubes;
inductor L1One end is respectively connected with a diode D1Anode, diode D5Anode, diode D2Cathode, diode D6A cathode, the connection node of which constitutes an end a;
one end of the AC power supply is respectively connected with a diode D4Cathode, diode D3Anode, diode D7Anode, diode D8Cathode, diode D9Anode, diode D10A cathode, the connection node of which constitutes an end point b;
diode D1The cathodes are respectively connected with a diode D3Cathode and capacitor C1One end, the connection node of which constitutes an endpoint p;
capacitor C1The other ends are respectively connected with a diode D11Anode, diode D12Cathode and capacitor C2One end, the connection node of which forms an endpoint n;
capacitor C2The other ends are respectively connected with a diode D4Anode, diode D2An anode, the connection node of which forms an endpoint m;
switch tube S1The drain electrodes are respectively connected with a diode D5Cathode, diode D7A cathode;
switch tube S1The source electrodes are respectively connected with a diode D6Anode, diode D8An anode;
switch tube S2The drain electrodes are respectively connected with a diode D9Cathode, diode D11A cathode;
switch tube S2The source electrodes are respectively connected with a diode D10Anode, diode D12An anode;
diode D7Anode connected diode D9An anode;
the other end of the AC power supply is connected with an inductor L1The other end;
load RLTwo ends are respectively connected with a capacitor C1One terminal, capacitor C2And the other end.
2. The two-switch three-level rectifier of a symmetric T-bridge as claimed in claim 1, wherein: by a diode D5、D6、D7、D8And a power switch tube S1A group of bidirectional power tubes inserted between the terminals a and b and having inductance L1The charging forms a loop to realize the direct current side boosting.
3. The two-switch three-level rectifier of a symmetric T-bridge as claimed in claim 1, wherein: by a diode D9、D10、D11、D12And a power switch tube S2A group of bidirectional power tubes inserted between the terminal b and the terminal n and composed of two split capacitors C1、C2The charging forms a loop to realize the neutral point potential balance.
4. The two-switch three-level rectifier of a symmetric T-bridge as claimed in claim 1, wherein: the switch tube S1、S2Is an insulated gate bipolar transistor IGBT, or an integrated gate commutated thyristor IGCT, or a power field effect transistor MOSFET.
5. A two-switch three-level rectifier according to any one of claims 1-4, wherein:
the method comprises six working modes:
the first working mode is as follows: diode D operating in the positive half-cycle of the AC supply1、D4Conducting power switch tube S1、S2Disconnecting; the current starts from the AC power supply AC and passes through the inductor L1Diode D1, split capacitor C1、C2Diode D4And finally back to the alternating current power supply AC; in this mode of operation, the voltage U between the terminals a and babEqual to the DC side voltage UdcSplitting capacitance C1、C2Charging, AC power supply AC and inductance L1Together to a load RLSupplying power, and linearly reducing the inductive current;
the second working mode is as follows: diode D operating in the positive half-cycle of the AC supply1、D10、D11Conducting power switch tube S2Conducting power switch tube S1Disconnecting; the current starts from the AC power supply AC and passes through the inductor L1Diode D1Split capacitor C1Diode D11Power switch tube S2Diode D10And finally back to the alternating current power supply AC; in this mode of operation, the voltage U between the terminals a and babEqual to the DC side voltage UdcHalf of (1), split capacitance C1Charging, splitting capacitance C2Discharging if the AC supply voltage Us is higher than UdcAt/2, in this state, the inductance L1The current rises linearly if the AC supply voltage Us is less than UdcAt/2, in this state, the inductance L1The current decreases linearly;
the working mode is three: diode D operating in the positive half-cycle of the AC supply5、D8Conducting power switch tube S1Conducting power switch tube S2Disconnecting; the current starts from the AC power supply AC and passes through the inductor L1Diode D5Power switch tube S1Diode D8And finally back to the alternating current power supply AC;in this mode of operation, the voltage U between the terminals a and babEqual to zero, split capacitance C1、C2Discharging to a load RLCharging, AC power supply gives inductance L1Charging;
working mode four: diode D operating in the negative half-cycle of the AC supply2、D3Conducting power switch tube S1、S2Is disconnected and current flows from the AC power supply AC through the diode D3Split capacitor C1、C2Diode D2Inductor L1And finally back to the alternating current power supply AC; in this mode of operation, the voltage U between the terminals a and babEqual to negative DC side voltage UdcSplitting capacitance C1、C2Charging, AC power supply AC and inductance L1Together to a load RLSupplying power, and linearly reducing the inductive current;
working mode five: diode D operating in the negative half-cycle of the AC supply9、D12Conducting power switch tube S2Conducting power switch tube S1Is disconnected and current flows from the AC power supply AC through the diode D9Power switch tube S2Diode D12Split capacitor C2Diode D2Inductor L1And finally back to the alternating current power supply AC; in this mode of operation, the voltage U between the terminals a and babEqual to negative DC side voltage UdcHalf of (1), split capacitance C1Discharge, splitting capacitance C2Charging, if the absolute value of the AC supply voltage Us is higher than UdcAt/2, in this state, the inductance L1The current rises linearly; if the absolute value of the AC supply voltage Us is less than UdcAt/2, in this state, the inductance L1The current decreases linearly;
the working mode is six: diode D operating in the negative half-cycle of the AC supply6、D7Conducting power switch tube S1Conducting power switch tube S2Is disconnected and current flows from the AC power supply AC through the diode D7Power switch tube S1Diode D6Inductor L1And finally back to the alternating current power supply AC; in this mode of operation, the voltage U between the terminals a and babEqual to zero, split capacitance C1、C2Discharging to a load RLCharging, AC power supply gives inductance L1And (6) charging.
CN202110119630.0A 2021-01-28 2021-01-28 Double-switch three-level rectifier of symmetrical T-shaped bridge Pending CN112865565A (en)

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CN113437884A (en) * 2021-06-28 2021-09-24 三峡大学 Three-level rectifier based on parallel diode clamping bidirectional switch
CN113437882A (en) * 2021-06-28 2021-09-24 三峡大学 Three-level rectifier based on parallel multi-diode series bidirectional switch

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113437884A (en) * 2021-06-28 2021-09-24 三峡大学 Three-level rectifier based on parallel diode clamping bidirectional switch
CN113437882A (en) * 2021-06-28 2021-09-24 三峡大学 Three-level rectifier based on parallel multi-diode series bidirectional switch
CN113437884B (en) * 2021-06-28 2023-12-19 三峡大学 Three-level rectifier based on parallel diode clamp bidirectional switch
CN113437882B (en) * 2021-06-28 2024-02-13 三峡大学 Three-level rectifier based on parallel multi-diode serial bidirectional switch

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