阅读说明：本技术 基于三开关管的双升压三电平整流器 (Double-boost three-level rectifier based on three switching tubes ) 是由 马辉 郑凯通 鲁海鹏 于 2020-06-16 设计创作，主要内容包括：基于三开关管的双升压三电平整流器,该整流器包括交流电源<I>u</I><Sub>g</Sub>、双耦合磁绕组<I>N</I><Sub>1</Sub>、双耦合磁绕组<I>N</I><Sub>2</Sub>、电容<I>C</I><Sub>1</Sub>、电容<I>C</I><Sub>2</Sub>、开关管Q<Sub>1</Sub>~Q<Sub>3</Sub>、二极管D<Sub>1</Sub>~D<Sub>10</Sub>。本发明一种基于三开关管的双升压三电平整流器,通过采用双向管结构以及开关管的不同组合实现了三电平,谐波含量低,且具有稳定的电平转换功能；当双向管结构处于故障状态下,电路仍可实现对直流侧的功率输出。(Double-boost three-level rectifier based on three switching tubes, comprising an alternating current power supply u g Double-coupling magnetic winding N 1 Double-coupling magnetic winding N 2 Capacitor and method for manufacturing the same C 1 Capacitor and method for manufacturing the same C 2 And a switching tube Q 1 ~Q 3 Diode D 1 ~D 10 . According to the double boost three-level rectifier based on the three switching tubes, the three levels are realized by adopting different combinations of the bidirectional tube structure and the switching tubes, the harmonic content is low, and the double boost three-level rectifier has a stable level conversion function; when the bidirectional tube structure is in a fault state, the circuit can still realize the power output to the direct current side.)

1. Two three level rectifiers that step up based on three switch tubes, its characterized in that:

the rectifier comprises an AC power source u_gDouble-coupling magnetic winding N₁Double-coupling magnetic winding N₂Capacitor C₁Capacitor C₂And a switching tube Q₁～Q₃Diode D₁～D₁₀；

AC power supply u_gOne terminal, diode D₁Cathode, double coupled magnetic winding N₁One ends are connected together to form a node c;

AC power supply u_gAnother terminal, diode D₂Cathode, double coupled magnetic winding N₂One ends are connected together to form a node d;

double-coupling magnetic winding N₁Another terminal, diode D₃Anode of (2), switching tube Q₁Are connected together to form a node a;

double-coupling magnetic winding N₂Another terminal, diode D₄Anode of (2), switching tube Q₂Drain electrode of (2), diode D₅Anode of (2), diode D₆Are connected together to form node b;

diode D₃Cathode of (2), diode D₄Cathode of (2), diode D₇Are connected together to form a node e;

diode D₁Anode of (2), diode D₂Anode of (2), diode D₈Cathode and switching tube Q₁Source electrode of (1), switching tube Q₂Are connected together to form a node f;

diode D₅Cathode of (2), diode D₉And the cathode of the switch tube Q₃The drain electrodes of the two electrodes are connected; diode D₆Anode of (2), diode D₁₀Anode of the switch tube Q₃The source electrodes of the two-way transistor are connected;

diode D₇Cathode and capacitor C₁The positive pole of the load R and one end of the load R are connected together to form a node m;

diode D₉Anode of (2), diode D₁₀Cathode and capacitor C₁Negative electrode of (1), capacitor C₂The anodes of which are connected together to form a node o;

diode D₈Anode and capacitor C₂And the other end of the load R is connected together to form a node n.

2. The double boost three-level rectifier based on the three switching tubes as claimed in claim 1, wherein: the double-coupling magnetic winding N₁Comprising a winding N₁₁And N₁₂Double coupled magnetic winding N₂Comprising a winding N₂₁And N₂₂Wherein the winding N₁₁、N₂₁Adopting co-core same-direction winding, winding N₁₂、N₂₂And adopting concentric reverse winding.

3. The double boost three-level rectifier based on the three switching tubes as claimed in claim 1, wherein: and the units between the node b and the node o form a bidirectional pipe insertion type structure.

4. The double boost three-level rectifier based on the three switching tubes as claimed in claim 1, wherein: the capacitor C₁、C₂The electrolytic capacitors are equal in capacitance value.

5. The double boost three-level rectifier based on the three switching tubes as claimed in claim 1, wherein: the switch tube Q₁～Q₃Both are MOSFETs or IGBTs or IGCTs with anti-parallel body diodes.

6. The double-boost three-level rectifier based on the three-switch tube according to any one of claims 1 to 5, wherein: the rectifier has two boost rectifying units, the first one is composed of a double-coupling magnetic winding N₁Diode D₃And a switching tube Q₁Composition is carried out; the second boost rectifying unit consists of a double-coupled magnetic winding N₂Diode D₄And a switching tube Q₂And (4) forming.

7. The double-boost three-level rectifier based on the three-switch tube according to any one of claims 1 to 5, wherein: when the circuit normally works, six working modes are provided:

1) three operating modes in the positive half cycle:

the first mode is as follows: switch tube Q₁、Q₂、Q₃All are turned off, AC power u_gAnd a double-coupled magnetic winding N₁And a double-coupling magnetic winding N₂Providing energy to a load R, a DC output voltage u_d>u_gThe winding current decreases linearly, the capacitance C₁、C₂Is in charge ofState of charging current i₁-i_dVoltage u_ab＝u₁+u₂＝+u_d；

And a second mode: switch tube Q₁Off, Q₂、Q₃On, the capacitance C₁Charging with a charging current of i₁-i_dCapacitor C₂Discharging to provide a load current i_dVoltage u_ab＝u₁＝+u_d/2；

And a third mode: switch tube Q₁On, Q₂、Q₃Off, AC source u_gTo two coupling magnetic winding N₁And a double-coupling magnetic winding N₂Charging, the winding current is in a linear rising state, the stage is a Boost process, and meanwhile, the capacitor C₁And C₂Supplying power to a load R at a voltage u_ab＝0；

2) Three working modes of the negative half period:

and a fourth mode: switch tube Q₁、Q₃Off, Q₂Conducting, AC power u_gTo two coupling magnetic winding N₁And a double-coupling magnetic winding N₂Charging, winding current rises linearly, and the stage is a Boost process, and meanwhile, a capacitor C₁And C₂Supplying power to a load R at a voltage u_ab＝0；

And a fifth mode: switch tube Q₁、Q₂Off, Q₃On, the capacitance C₂Charging with a charging current of i_o-i_dCapacitor C₁Supplying power to a load R at a voltage u_ab＝-u₂＝-u_d/2；

Mode six: switch tube Q₁、Q₂、Q₃All are turned off, AC power u_gAnd a double-coupled magnetic winding N₁And a double-coupling magnetic winding N₂Providing energy to a load R, a DC output voltage u_d>u_gThe winding current decreases linearly, the capacitance C₁、C₂In a charging state with a charging current of i₁-i_dVoltage u_ab＝-u₁-u₂＝-u_d；

Under the six working modes, the network side inputs current i_gThe two return paths are respectively provided, namely, in a power frequency period, the double-coupling magnetic winding N₁And a double-coupling magnetic winding N₂In which current flows.

8. Two three level rectifiers that step up based on three switch tubes, its characterized in that: the rectifier includes:

AC power supply u_gDouble-coupling magnetic winding N₁Double-coupling magnetic winding N₂Capacitor C₁Capacitor C₂And a switching tube Q₁～Q₃Diode D₁～D₈；

AC power supply u_gOne terminal of (1), diode D₁Cathode, double coupled magnetic winding N₁Are connected together to form a node c;

AC power supply u_gAnother terminal of (1), diode D₂Cathode, double coupled magnetic winding N₂Are connected together to form a node d;

double-coupling magnetic winding N₁Another terminal of (1), diode D₃Anode of (2), switching tube Q₁Are connected together to form a node a;

double-coupling magnetic winding N₂Another terminal of (1), diode D₄Anode of (2), switching tube Q₂Drain electrode of (1), and switching tube Q₃Source electrode of (1), switching tube Q₄Are connected together to form a node b;

diode D₃Cathode of (2), diode D₄Cathode of (2), diode D₅Are connected together to form a node e;

diode D₁Anode of (2), diode D₂Anode of (2), diode D₆Cathode and switching tube Q₁Source electrode of (1), switching tube Q₂Are connected together to form a node f;

diode D₇Cathode and switching tube Q₃The drain electrodes of the two electrodes are connected; diode D₈Anode switch tube Q₄The source electrodes of the two-way transistor are connected;

diode D₅Cathode and capacitor C₁The positive pole of the load R and one end of the load R are connected together to form a node m;

diode D₇Anode of (2), diode D₈Cathode and capacitor C₁Negative electrode of (1), capacitor C₂The anodes of which are connected together to form a node o;

diode D₆Anode and capacitor C₂And the other end of the load R is connected together to form a node n.

Technical Field

The invention relates to the technical field of power electronic energy conversion, in particular to a double-boost three-level rectifier based on a three-switch tube.

Background

With the industrial development of modern power electronic technology, the rectification technology is mature, and the wide application of power electronic devices, especially harmonic pollution generated by some nonlinear power electronic devices, reduces the efficiency of electric energy transmission, conversion and utilization, and can cause equipment failure or even damage in severe cases. For example, in the conventional two-level rectification technology, the problems of high harmonic content, large inductor volume, reliability and safety caused by high voltage/current stress exist.

The currently adopted Power Factor Correction (PFC) technology is generally implemented by adding a bridge rectifier circuit on an ac input side to realize ac-dc conversion and reduce harmonic damage, and is widely applied in the fields of switching power supplies, charging piles, rail transit, and the like. Under the application occasions of medium and high power, in order to reduce loss and improve power transmission capacity, a soft switching technology and a large number of novel topological structures are proposed in succession, wherein a bridgeless PFC circuit has a wide application prospect, and the development of a multi-level converter technology provides a brand new thought for realizing high-efficiency application occasions such as high reliability, high frequency, low input and high output, and becomes a hot point of research of domestic and foreign scholars.

Disclosure of Invention

The invention provides a double boost three-level rectifier based on a three-switch tube, which realizes three levels by adopting different combinations of a bidirectional tube structure and the switch tube, is beneficial to reducing harmonic waves and has a stable level conversion function; when the bidirectional tube structure is in a fault state, the circuit can still realize the power output to the direct current side.

The technical scheme adopted by the invention is as follows:

a double boost three-level rectifier based on a three-switch tube comprises:

AC power supply u_gDouble-coupling magnetic winding N₁Double-coupling magnetic winding N₂Capacitor C₁Capacitor C₂And a switching tube Q₁～Q₃Diode D₁～D₁₀；

AC power supply u_gOne terminal, diode D₁Cathode, double coupled magnetic winding N₁One ends are connected together to form a node c;

AC power supply u_gAnother terminal, diode D₂Cathode, double coupled magnetic winding N₂One ends are connected together to form a node d;

double-coupling magnetic winding N₁Another terminal, diode D₃Anode of (2), switching tube Q₁Are connected together to form a node a;

double-coupling magnetic winding N₂Another terminal, diode D₄Anode of (2), switching tube Q₂Drain electrode of (2), diode D₅Anode of (2), diode D₆Are connected together to form node b;

diode D₃Cathode of (2), diode D₄Cathode of (2), diode D₇Are connected together to form a node e;

diode D₁Anode of (2), diode D₂Anode of (2), diode D₈Cathode and switching tube Q₁Source electrode of (1), switching tube Q₂Are connected together to form a node f;

diode D₅Cathode of (2), diode D₉And the cathode of the switch tube Q₃The drain electrodes of the two electrodes are connected; diode D₆Anode of (2), diode D₁₀Anode of the switch tube Q₃The source electrodes of the two-way transistor are connected;

diode D₇Cathode and capacitor C₁The positive pole of the load R and one end of the load R are connected together to form a node m;

diode D₉Anode of (2), diode D₁₀Cathode and capacitor C₁Negative electrode of (1), capacitor C₂The anodes of which are connected together to form a node o;

diode D₈Anode and capacitor C₂And the other end of the load R is connected together to form a node n.

The double-coupling magnetic winding N₁Comprising a winding N₁₁And N₁₂Double coupled magnetic winding N₂Comprising a winding N₂₁And N₂₂Wherein the winding N₁₁、N₂₁Adopting co-core same-direction winding, winding N₁₂、N₂₂And adopting concentric reverse winding.

And the units connected between the node b and the node o form a bidirectional pipe insertion type structure.

The capacitor C₁、C₂The electrolytic capacitors are equal in capacitance value.

The switch tube Q₁～Q₃Both are MOSFETs or IGBTs or IGCTs with anti-parallel body diodes.

The rectifier has two boost rectifying units, the first one is composed of a double-coupling magnetic winding N₁Diode D₃And a switching tube Q₁Composition is carried out; the second boost rectifying unit consists of a double-coupled magnetic winding N₂Diode D₄And a switching tube Q₂And (4) forming.

In a power frequency period, the network side inputs current i_gHaving two return paths, i.e. doubly-coupled magnetic windings N₁And a double-coupling magnetic winding N₂In which current flows.

The invention discloses a double-boost three-level rectifier based on a three-switch tube, which has the following technical effects:

(1) the three-level rectifier circuit can provide stable direct current output for a load while realizing the function of power factor correction, and has the advantages of small harmonic content and low voltage stress of a switching device compared with the traditional two-level rectifier.

(2) Switch tube Q in circuit₁、Q₂Is connected to power ground, the switching pulse distribution is easily realized, and the low-frequency diode D₁、D₂The output end is connected with the input end, a low-impedance current path is always provided for the loop current, and the common-mode interference suppression circuit has the capability of suppressing common-mode interference.

(3) The bidirectional tube connected between the node f and the node o in the circuit is used as a key structure for realizing three levels, has a stable level conversion function, and can be immediately converted into a three-level rectification circuit to work when the bidirectional tube fails or is damaged, so that the power output of a post-stage circuit is ensured, and the power supply is safe and reliable.

(4) The rectifier has the following advantages: the harmonic content is low, and the anti-interference capability is strong; secondly, the voltage stress of the switching tube is reduced, and the working reliability of the circuit is improved; and thirdly, the power factor correction can be realized, and the reliable power supply of the load can be ensured.

Drawings

Fig. 1 is a schematic circuit diagram of a single-phase double-boost bridgeless five-level rectifier of embodiment 1 of the present invention.

Fig. 2 is a schematic circuit diagram of a single-phase double-boost bridgeless five-level rectifier of embodiment 2 of the present invention.

FIG. 3 is a diagram of a current flow path in the working mode of embodiment 1 of the present invention;

FIG. 4 is a diagram of two current flow paths in the working mode of embodiment 1 of the present invention;

FIG. 5 is a three-current-flow path diagram of the working mode of embodiment 1 of the present invention;

FIG. 6 is a diagram of four current flow paths in the working mode of embodiment 1 of the present invention;

fig. 7 is a diagram of five current flow paths in the working mode of embodiment 1 of the present invention;

fig. 8 is a six-current flow path diagram of the operation mode of embodiment 1 of the present invention;

in the case of the figures 3 to 8,

showing the current flow path.

FIG. 9 shows a switch tube Q according to embodiment 1 of the present invention₁～Q₃Six working mode diagrams.

FIG. 10(a) shows an AC input voltage u in example 1 of the present invention_gAnd current i_gA waveform diagram;

FIG. 10(b) shows the voltage u in example 1 of the present invention_abA waveform diagram;

FIG. 10(c) shows the voltage u in example 1 of the present invention_abFive level state oscillograms are realized;

FIG. 10(d) shows the DC side output voltage u in example 1 of the present invention_dAnd (4) waveform diagrams.

FIG. 11(a) shows the voltage u at the time of level transition in example 1 of the present invention_gAnd current i_gA waveform diagram;

FIG. 11(b) shows the voltage u at the time of level transition in example 1 of the present invention_abA waveform diagram;

FIG. 11(c) shows output power at the time of level conversion in embodiment 1 of the present inventionPress u_dAnd (4) waveform diagrams.

Detailed Description