CN218829645U

CN218829645U - Three-phase rectifier with wide output voltage range and low ripple

Info

Publication number: CN218829645U
Application number: CN202223247230.7U
Authority: CN
Inventors: 颜景斌; 王榕培; 葛孟娜
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-04-07
Anticipated expiration: 2032-12-05

Abstract

The utility model relates to a rectifier technical field, concretely relates to three-phase rectifier of wide output voltage scope and low ripple. Based on this three-phase voltage source rectifier includes: the device comprises an alternating current voltage source module, a Y-shaped rectifying module, a low ripple Buck voltage transformation module, a MOSFET control module, a Buck control module and a load. The utility model has the characteristics of wide output voltage scope and low ripple vary voltage output, application prospect is very extensive. The utility model discloses compare in the past traditional rectifier, utilized Y type rectification structure, obtained the voltage output of wide range to there is better performance in the electric automobile field, can compatible various nominal battery's voltage level, simultaneously, this patent has realized output voltage's low ripple through buck DC-DC transform module, and the output waveform is more level and smooth, and the ripple is littleer, and is safer, stable, practical, and application prospect is very extensive.

Description

Three-phase rectifier with wide output voltage range and low ripple

Technical Field

The utility model relates to a rectifier technical field, concretely relates to three-phase rectifier of wide output voltage scope and low ripple.

Background

Nowadays, the fuel cell industry and the electric vehicle lithium battery industry develop rapidly, and the demand for a rectifier is higher and higher, and the rectifier is a device for converting alternating current into direct current based on a power electronic switching device. The current more common three-phase voltage source rectifier structure has: uncontrollable bridge rectification, half-controlled bridge rectification, and full-controlled bridge rectification. For the electric vehicle field, an electric vehicle charger should have a high efficiency output power, and a wide range of dc output voltage to be compatible with various nominal battery voltage levels. The traditional three-phase rectifier has the advantages of simple structure, easy transistor control method and low cost, but also has the defects of narrow output voltage range and large output direct-current voltage ripple, and if wide-range voltage output is to be realized, the size of the output direct-current voltage can be changed only by adjusting the size of the alternating-current voltage; if the low ripple output is desired, it can only be achieved by increasing the filter inductance, but this necessarily increases the loss.

In order to solve the problem, the utility model provides a three-phase rectifier of wide output voltage scope and low ripple based on Y type rectifier.

Disclosure of Invention

The utility model aims at providing a three-phase rectifier of wide output voltage scope and low ripple to solve the problem that traditional three-phase full control rectifier can't realize wide output voltage scope and low ripple output.

The utility model discloses the technical scheme who takes does: a three-phase rectifier with wide output voltage range and low ripple waves comprises an alternating current voltage source module, a Y-shaped rectifying module, a low ripple wave Buck voltage transformation module, an MOSFET control module, a Buck control module and a load; the method is characterized in that: the output of the alternating current voltage source is connected with the input of the Y-shaped rectifying module, the output of the MOSFET control module is connected with the input of the Y-shaped rectifying module, the output of the Y-shaped rectifying module is connected with the input of the low ripple Buck voltage transformation module, and the output of the low ripple Buck voltage transformation module is connected with a load; the alternating voltage source comprises a voltage source Va, a voltage source Vb and a voltage source Vc; the Y-type rectifying module comprises a transistor switch tube T1, a transistor switch tube T2, a transistor switch tube T3, a transistor switch tube T4, a transistor switch tube T5, a transistor switch tube T6, a transistor switch tube T7, a transistor switch tube T8, a transistor switch tube T9, a transistor switch tube T10, a transistor switch tube T11, a transistor switch tube T12, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; the low ripple Buck voltage transformation module comprises an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4, a diode Df1, a diode Df2, a diode Df3, a diode Df4, a diode Df5, a diode Df6, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8.

In the alternating-current voltage source, a voltage source Va, a voltage source Vb and a voltage source Vc are symmetrical three-phase voltage sources, the amplitude and the frequency are equal, the phase of the voltage source Va is advanced by 120 degrees compared with the phase of the voltage source Vb, and the phase of the voltage source Vb is advanced by 120 degrees compared with the phase of the voltage source Vc; the voltage source Va, the voltage source Vb and the voltage source Vc adopt a star-shaped neutral point grounding connection method, the anode of the voltage source Va is connected with the drain electrode of the transistor switch tube T1 and the anode of the capacitor C1, the anode of the voltage source Vb is connected with the drain electrode of the transistor switch tube T5 and the anode of the capacitor C2, and the anode of the voltage source Vc is connected with the drain electrode of the transistor switch tube T9 and the anode of the capacitor C3.

The MOSFET control module outputs 12 paths of control signals, and output interfaces are respectively an MOS tube T1, an MOS tube T2, an MOS tube T3, an MOS tube T4, an MOS tube T5, an MOS tube T6, an MOS tube T7, an MOS tube T8, an MOS tube T9, an MOS tube T10, an MOS tube T11 and an MOS tube T12.

In the Y-type rectifying module, a gate pole of a transistor T1 is connected with a T1 output interface of an MOSFET control module, a drain pole is connected with a positive pole of a voltage source Va and a cathode of a diode D1, a source pole is connected with a positive pole of the diode D1 and a positive pole of an inductor L1, a gate pole of a transistor T2 is connected with a T2 output interface of the MOSFET control module, a drain pole is connected with a cathode of the diode D2 and a positive pole of the inductor L1, a source pole is connected with a positive pole of the diode D2 and a negative pole of a capacitor C1, a gate pole of a transistor T5 is connected with a T5 output interface of the MOSFET control module, a drain pole is connected with a positive pole of a voltage source Vb and a cathode of the diode D5, a source pole is connected with a positive pole of the diode D5 and a positive pole of the inductor L2, a gate pole of a transistor T6 is connected with a T6 output interface of the MOSFET control module, a drain pole is connected with a cathode of the diode D6 and a positive pole of the inductor L2, a source pole is connected with a positive pole of the diode D6 and a negative pole of the capacitor C1, the gate of the transistor T9 is connected with the T9 output interface of the MOSFET control module, the drain is connected with the positive pole of a voltage source Vc and the cathode of the diode D9, the source is connected with the anode of the diode D9 and the positive pole of an inductor L3, the gate of the transistor T10 is connected with the T10 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D10 and the positive pole of the inductor L3, the source is connected with the anode of the diode D10 and the negative pole of the capacitor C1, the gate of the transistor T3 is connected with the T3 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D3 and the positive pole of the capacitor C4, the source is connected with the anode of the diode D3 and the negative pole of the inductor L1, the gate of the transistor T4 is connected with the T4 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D4 and the negative pole of the inductor L1, the source is connected with the anode of the diode D4 and the negative pole of the capacitor C1, the gate of the transistor T7 is connected with the T7 output interface of the MOSFET control module, and the drain is connected with the cathode of the anode of the diode D7 and the positive pole of the capacitor C4, the source electrode is connected with the anode of a diode D7 and the cathode of an inductor L2, the gate electrode of a transistor T8 is connected with the T8 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D8 and the cathode of the inductor L2, the source electrode is connected with the anode of the diode D8 and the cathode of a capacitor C1, the gate electrode of a transistor T11 is connected with the T11 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D11 and the anode of the capacitor C4, the source electrode is connected with the anode of the diode D11 and the cathode of the inductor L3, the gate electrode of a transistor T12 is connected with the T12 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D12 and the cathode of the inductor L3, the source electrode is connected with the anode of the diode D12 and the cathode of the capacitor C1, the anode of the capacitor C1 is connected with the anode of a voltage source Va, the anode of the capacitor C2 is connected with the anode of a voltage source Vb, the cathode of the capacitor C1 is connected with the cathode of the capacitor Vc 3, the anode of the capacitor is connected with the cathode of the voltage source C1, and the cathode of the capacitor C4 is connected with the cathode of the capacitor C1.

The Buck control module outputs 4 paths of signals, and output interfaces are Q1, Q2, Q3 and Q4 respectively.

In the low ripple Buck transformation module, a gate of a transistor Q1 is connected with a Q1 output interface of a Buck control module, an emitter is connected with a positive electrode of a capacitor C5, a gate of a transistor Q2 is connected with a Q2 output interface of the Buck control module, a collector is connected with a positive electrode of the capacitor C5, the emitter is connected with a load positive electrode, a gate of a transistor Q3 is connected with a Q3 output interface of the Buck control module, a collector is connected with a collector of the transistor Q1, the emitter is connected with a positive electrode of the capacitor C7, a gate of a transistor Q4 is connected with a Q4 output interface of the Buck control module, the collector is connected with a positive electrode of the capacitor C7, the emitter is connected with a load positive electrode, a cathode of a diode Df1 is connected with a negative electrode of the capacitor C5, an anode is connected with a load negative electrode, a cathode of the diode Df2 is connected with a positive electrode of the capacitor C6, an anode is connected with a negative electrode of the capacitor C5, a cathode of the diode Df3 is connected with a positive electrode of the capacitor C5, a cathode is connected with a negative electrode of the capacitor C6, a cathode of the capacitor C7 is connected with a negative electrode of the capacitor C8, and a cathode of the capacitor C6 is connected with a load anode of the capacitor C6, and a cathode of the capacitor C8.

The utility model relates to a three-phase rectifier of wide output voltage scope and low ripple's advantage lies in: firstly, a Y-shaped connection method which is different from that of the traditional rectifier bridge is applied to the rectifier bridge part; secondly, increased a low ripple Buck converter based on switched capacitor again at rectifier bridge output part, makeed the rectifier can realize wide voltage range's low ripple output. The utility model relates to a three-phase rectifier of wide output voltage scope and low ripple compares in traditional three-phase full control bridge rectifier, has the output voltage scope of wideer scope, and the output waveform is more level and smooth, and the ripple is littleer, and is safer, stable, practical.

For a more clear explanation, the present invention provides a three-phase rectifier with a wide output voltage range and low ripple, which is described in further detail with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a circuit structure diagram of the wide output voltage range and low ripple three-phase rectifier of the present invention.

Fig. 2 shows a buck-boost module for phase a in a rectifier.

Fig. 3 shows the operation mode when the output voltage is higher than the input voltage.

Fig. 4 shows the operation mode when the output voltage is lower than the input voltage.

Fig. 5 shows a first operating mode of the low ripple Buck converter module.

Fig. 6 is a second mode of operation of the low ripple Buck voltage transformation module.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it should be noted that the embodiments described herein are only some embodiments of the present invention, not all implementation manners of the present invention, and the embodiments are only exemplary.

Fig. 1 shows a circuit structure diagram of a wide output voltage range and low ripple three-phase rectifier according to the present invention. The concrete structure is as follows: the low-ripple Buck voltage transformation device comprises an alternating current voltage source module, a Y-shaped rectifying module, a low-ripple Buck voltage transformation module, an MOSFET control module, a Buck control module and a load; the method is characterized in that: the output of the alternating current voltage source is connected with the input of the Y-shaped rectifying module, the output of the MOSFET control module is connected with the input of the Y-shaped rectifying module, the output of the Y-shaped rectifying module is connected with the input of the low ripple Buck voltage transformation module, and the output of the low ripple Buck voltage transformation module is connected with a load; the alternating voltage source comprises a voltage source Va, a voltage source Vb and a voltage source Vc; the Y-type rectifying module comprises a transistor switch tube T1, a transistor switch tube T2, a transistor switch tube T3, a transistor switch tube T4, a transistor switch tube T5, a transistor switch tube T6, a transistor switch tube T7, a transistor switch tube T8, a transistor switch tube T9, a transistor switch tube T10, a transistor switch tube T11, a transistor switch tube T12, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; the low ripple Buck voltage transformation module comprises an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4, a diode Df1, a diode Df2, a diode Df3, a diode Df4, a diode Df5, a diode Df6, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8.

In the Y-type rectifying module, a gate pole of a transistor T1 is connected with a T1 output interface of the MOSFET control module, a drain pole is connected with an anode of a voltage source Va and a cathode of a diode D1, a source pole is connected with an anode of the diode D1 and an anode of an inductor L1, a gate pole of a transistor T2 is connected with a T2 output interface of the MOSFET control module, a drain pole is connected with a cathode of the diode D2 and an anode of the inductor L1, a source pole is connected with an anode of the diode D2 and a cathode of a capacitor C1, a gate pole of a transistor T5 is connected with a T5 output interface of the MOSFET control module, a drain pole is connected with an anode of a voltage source Vb and a cathode of the diode D5, a source pole is connected with an anode of the diode D5 and an anode of the inductor L2, a drain pole of a transistor T6 is connected with a T6 output interface of the MOSFET control module, a drain pole is connected with an anode of the diode D6 and an anode of the inductor L2, and a source pole is connected with an anode of the diode D6 and a cathode of the capacitor C1, the gate of the transistor T9 is connected with the T9 output interface of the MOSFET control module, the drain is connected with the positive pole of a voltage source Vc and the cathode of the diode D9, the source is connected with the anode of the diode D9 and the positive pole of the inductor L3, the gate of the transistor T10 is connected with the T10 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D10 and the positive pole of the inductor L3, the source is connected with the anode of the diode D10 and the cathode of the capacitor C1, the gate of the transistor T3 is connected with the T3 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D3 and the anode of the capacitor C4, the source is connected with the anode of the diode D3 and the cathode of the inductor L1, the gate of the transistor T4 is connected with the T4 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D4 and the cathode of the inductor L1, the source is connected with the anode of the diode D4 and the cathode of the capacitor C1, the gate of the transistor T7 is connected with the T7 output interface of the MOSFET control module, and the drain is connected with the cathode of the anode of the diode D7 and the anode of the capacitor C4, the source electrode is connected with the anode of a diode D7 and the cathode of an inductor L2, the gate electrode of a transistor T8 is connected with the T8 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D8 and the cathode of the inductor L2, the source electrode is connected with the anode of the diode D8 and the cathode of a capacitor C1, the gate electrode of a transistor T11 is connected with the T11 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D11 and the anode of the capacitor C4, the source electrode is connected with the anode of the diode D11 and the cathode of the inductor L3, the gate electrode of a transistor T12 is connected with the T12 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D12 and the cathode of the inductor L3, the source electrode is connected with the anode of the diode D12 and the cathode of the capacitor C1, the anode of the capacitor C1 is connected with the anode of a voltage source Va, the anode of the capacitor C2 is connected with the anode of a voltage source Vb, the cathode of the capacitor C1 is connected with the cathode of the capacitor Vc 3, the anode of the capacitor is connected with the cathode of the voltage source C1, and the cathode of the capacitor C4 is connected with the cathode of the capacitor C1.

Then, please refer to fig. 1, fig. 2, fig. 3, fig. 4, the utility model discloses a difference of Y type rectifier bridge structure and traditional IGBT three-phase full-controlled bridge type voltage source rectifier lies in, the utility model discloses 6 MOSFET transistors of group and 6 freewheeling diodes that correspond of group have been increased to the rectifier bridge to realize the output range of wide voltage. The Y-type rectifier bridge part is composed of three buck-boost modules, fig. 2 shows a buck-boost module of a phase, and control strategies of the three modules are independent from each other, which means that the control strategy of the three phases is simpler. Taking the a-phase voltage as an example, the transistor T1 is kept continuously on, and the transistor T2 is continuously off, so that fig. 3 is obtained, where the a-phase buck-boost module is in the buck mode, and the output voltage is lower than the input voltage; keeping the transistor T3 continuously turned on and the transistor T4 continuously turned off, the fig. 4 is obtained, where the a-phase buck-boost module is in the boost mode and the output voltage is higher than the input voltage. The on-off principle of the other two phases is the same. Thus, the three-phase alternating current passes through the buck-boost module of the Y-type rectifier, and direct current in a wide voltage range is output.

Please refer to fig. 5 and fig. 6. Through the rectification process, the output of the Y-type full-bridge rectification module is approximate to direct-current voltage. The output voltage is the input voltage of the low ripple Buck transformation module. As shown in fig. 5, Q1 and Q4 are turned on, Q2 and Q3 are turned off, at this time, the dc voltage charges capacitors C5 and C6, and capacitors C7 and C8 discharge to supply power to the load, and after a period of time elapses, C5 and C6 are charged, Q1 is turned off, and C7 and C8 continue to discharge. When C7 and C8 complete discharging, as shown in fig. 6, Q4 is turned off, Q2 and Q3 are turned on, and at this time, the dc voltage charges C7 and C8, and C5 and C6 respectively supply power to the load through Df1 and Df3, and when C7 and C8 complete charging, Q3 is turned off, and C5 and C6 continue discharging. Repeating the above steps, wherein in the first half period, the first group of capacitors C5 and C6 are charged in series, and the second group of capacitors C7 and C8 are discharged in parallel; in the second half cycle, the first set of capacitors C5, C6 are discharged in parallel and the second set of capacitors C7, C8 are charged in series. This approach also improves the efficiency of charging while reducing ripple. Therefore, the direct-current voltage which is directly output originally is subjected to low ripple buck conversion based on the switched capacitor, so that the voltage is smoother, and the impact on the battery of the electric automobile is smaller.

The above description is only for the preferred embodiment of the present invention, but not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention should be determined by the appended claims.

Claims

1. A three-phase rectifier with wide output voltage range and low ripple waves comprises an alternating current voltage source module, a Y-shaped rectifying module, a low ripple wave Buck voltage transformation module, an MOSFET control module, a Buck control module and a load; the method is characterized in that: the output of the alternating current voltage source is connected with the input of the Y-shaped rectifying module, the output of the MOSFET control module is connected with the input of the Y-shaped rectifying module, the output of the Y-shaped rectifying module is connected with the input of the low ripple Buck voltage transformation module, and the output of the low ripple Buck voltage transformation module is connected with a load; the alternating voltage source comprises a voltage source Va, a voltage source Vb and a voltage source Vc; the Y-type rectification module comprises a transistor switch tube T1, a transistor switch tube T2, a transistor switch tube T3, a transistor switch tube T4, a transistor switch tube T5, a transistor switch tube T6, a transistor switch tube T7, a transistor switch tube T8, a transistor switch tube T9, a transistor switch tube T10, a transistor switch tube T11, a transistor switch tube T12, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; the low ripple Buck voltage transformation module comprises an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4, a diode Df1, a diode Df2, a diode Df3, a diode Df4, a diode Df5, a diode Df6, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8.

2. The three-phase rectifier according to claim 1, wherein the three-phase rectifier has a wide output voltage range and low ripple, and comprises: in the alternating-current voltage source, a voltage source Va, a voltage source Vb and a voltage source Vc are symmetrical three-phase voltage sources, the amplitude and the frequency are equal, the phase of the voltage source Va is advanced by 120 degrees compared with the phase of the voltage source Vb, and the phase of the voltage source Vb is advanced by 120 degrees compared with the phase of the voltage source Vc; the voltage source Va, the voltage source Vb and the voltage source Vc adopt a star-shaped neutral point grounding connection method, the anode of the voltage source Va is connected with the drain electrode of the transistor switch tube T1 and the anode of the capacitor C1, the anode of the voltage source Vb is connected with the drain electrode of the transistor switch tube T5 and the anode of the capacitor C2, and the anode of the voltage source Vc is connected with the drain electrode of the transistor switch tube T9 and the anode of the capacitor C3.

3. The three-phase rectifier of claim 1, wherein the three-phase rectifier has a wide output voltage range and low ripple, and further comprises: the MOSFET control module outputs 12 paths of control signals, and output interfaces are respectively an MOS tube T1, an MOS tube T2, an MOS tube T3, an MOS tube T4, an MOS tube T5, an MOS tube T6, an MOS tube T7, an MOS tube T8, an MOS tube T9, an MOS tube T10, an MOS tube T11 and an MOS tube T12.

4. The three-phase rectifier of claim 1, wherein the three-phase rectifier has a wide output voltage range and low ripple, and further comprises: in the Y-type rectifying module, a gate pole of a transistor T1 is connected with a T1 output interface of the MOSFET control module, a drain pole is connected with an anode of a voltage source Va and a cathode of a diode D1, a source pole is connected with an anode of the diode D1 and an anode of an inductor L1, a gate pole of a transistor T2 is connected with a T2 output interface of the MOSFET control module, a drain pole is connected with a cathode of the diode D2 and an anode of the inductor L1, a source pole is connected with an anode of the diode D2 and a cathode of a capacitor C1, a gate pole of a transistor T5 is connected with a T5 output interface of the MOSFET control module, a drain pole is connected with an anode of a voltage source Vb and a cathode of the diode D5, a source pole is connected with an anode of the diode D5 and an anode of the inductor L2, a drain pole of a transistor T6 is connected with a T6 output interface of the MOSFET control module, a drain pole is connected with an anode of the diode D6 and an anode of the inductor L2, and a source pole is connected with an anode of the diode D6 and a cathode of the capacitor C1, the gate of the transistor T9 is connected with the T9 output interface of the MOSFET control module, the drain is connected with the positive pole of a voltage source Vc and the cathode of the diode D9, the source is connected with the anode of the diode D9 and the positive pole of an inductor L3, the gate of the transistor T10 is connected with the T10 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D10 and the positive pole of the inductor L3, the source is connected with the anode of the diode D10 and the negative pole of the capacitor C1, the gate of the transistor T3 is connected with the T3 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D3 and the positive pole of the capacitor C4, the source is connected with the anode of the diode D3 and the negative pole of the inductor L1, the gate of the transistor T4 is connected with the T4 output interface of the MOSFET control module, the drain is connected with the cathode of the diode D4 and the negative pole of the inductor L1, the source is connected with the anode of the diode D4 and the negative pole of the capacitor C1, the gate of the transistor T7 is connected with the T7 output interface of the MOSFET control module, and the drain is connected with the cathode of the anode of the diode D7 and the positive pole of the capacitor C4, the source electrode is connected with the anode of a diode D7 and the cathode of an inductor L2, the gate electrode of a transistor switch tube T8 is connected with a T8 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D8 and the cathode of the inductor L2, the source electrode is connected with the anode of the diode D8 and the cathode of a capacitor C1, the gate electrode of a transistor switch tube T11 is connected with a T11 output interface of the MOSFET control module, the drain electrode is connected with the cathode of the diode D11 and the anode of a capacitor C4, the source electrode is connected with the anode of the diode D11 and the cathode of the inductor L3, the gate electrode of a transistor switch tube T12 is connected with the T12 output interface of the MOSFET control module, the drain electrode is connected with the cathode of a diode D12 and the cathode of the inductor L3, the source electrode is connected with the anode of a diode D12 and the cathode of a capacitor C1, the anode of the capacitor C1 is connected with the anode of a voltage source Va, the anode of the capacitor C2 is connected with the anode of the voltage source, the cathode of the capacitor Vb 1 is connected with the cathode of the capacitor C1, the anode of the capacitor C3 is connected with the anode of the voltage source Vc 1, the cathode of the capacitor C4 is connected with the cathode of the capacitor C1, and the cathode of the capacitor C1 is connected with the capacitor C1.

5. The three-phase rectifier of claim 1, wherein the three-phase rectifier has a wide output voltage range and low ripple, and further comprises: the Buck control module outputs 4 paths of signals, and output interfaces are Q1, Q2, Q3 and Q4 respectively.

6. The three-phase rectifier according to claim 1, wherein the three-phase rectifier has a wide output voltage range and low ripple, and comprises: in the low ripple Buck transformation module, a gate of a transistor Q1 is connected with a Q1 output interface of a Buck control module, an emitter is connected with a positive electrode of a capacitor C5, a gate of a transistor Q2 is connected with a Q2 output interface of the Buck control module, a collector is connected with a positive electrode of the capacitor C5, the emitter is connected with a load positive electrode, a gate of a transistor Q3 is connected with a Q3 output interface of the Buck control module, a collector is connected with a collector of the transistor Q1, the emitter is connected with a positive electrode of the capacitor C7, a gate of a transistor Q4 is connected with a Q4 output interface of the Buck control module, the collector is connected with a positive electrode of the capacitor C7, the emitter is connected with a load positive electrode, a cathode of a diode Df1 is connected with a negative electrode of the capacitor C5, an anode is connected with a load negative electrode, a cathode of the diode Df2 is connected with a positive electrode of the capacitor C6, an anode is connected with a negative electrode of the capacitor C5, a cathode of the diode Df3 is connected with a positive electrode of the capacitor C5, a cathode is connected with a negative electrode of the capacitor C6, a cathode of the capacitor C7 is connected with a negative electrode of the capacitor C8, and a cathode of the capacitor C6 is connected with a load anode of the capacitor C6, and a cathode of the capacitor C8.