Converter

Abstract

The utility model discloses a converter, which comprises a common-mode capacitor, a control unit, a driving unit, a main power unit and a filter, the common-mode capacitor is connected between a grounding end and the control unit, the control unit is electrically connected with the driving unit, the driving unit is electrically connected with a driving end of the main power unit through a driving line, and the main power unit is electrically connected with the filter. The main power unit is connected between the positive direct current bus and the negative direct current bus, the filter is arranged on the driving line and used for suppressing common-mode voltage, and the filter is arranged on the driving line where the driving unit is connected with the main power unit, so that the common-mode voltage can be suppressed through the filter in the working process of the converter; therefore, the interference of common-mode voltage on the driving unit can be reduced, and the performance of the converter is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a converter. Background Art

[0002] like Figure 1 As shown, it is a structural schematic diagram of a converter provided by the related technology, the converter includes a common-mode capacitor C2, a control unit 11, a drive unit 12 and a main power unit 13, wherein the drive unit 12 includes a drive transformer. Under ideal conditions, the primary and secondary sides of the drive transformer are completely isolated. However, in actual use, a small coupling capacitor is parasitic between the primary and secondary sides of the drive transformer.

[0003] When the converter is working, it will generate a very high common mode voltage between the main power circuit and the earth (PE). Figure 1 As shown, the common mode voltage interferes with the normal operation of the driving unit 12 through the coupling capacitor between the primary side and the secondary side of the driving transformer. Utility Model Content

[0004] The utility model provides a converter, which is used to solve the problem in the prior art that the common mode voltage generated between the main power circuit and the earth by the converter affects the normal operation of the driving unit.

[0005] The embodiment of the utility model provides a converter, comprising: a common mode capacitor, a control unit, a drive unit, a main power unit and a filter;

[0006] The common mode capacitor is connected between the control unit and the ground terminal;

[0007] The control unit is also electrically connected to the drive unit;

[0008] The driving unit is also electrically connected to the driving end of the main power unit via a driving line;

[0009] The main power unit is connected between the positive DC bus and the negative DC bus;

[0010] The filter is arranged on the driving line to suppress the common mode voltage.

[0011] In a possible implementation, the filter includes a common mode magnetic ring;

[0012] The common mode magnetic ring is a manganese zinc magnetic ring or a nickel zinc magnetic ring.

[0013] In a possible implementation, the main power unit includes at least one bridge arm, and each bridge arm includes a first switch tube and a second switch tube;

[0014] The common mode magnetic ring includes a first common mode magnetic ring corresponding to each bridge arm;

[0015] For each bridge arm, a driving line connecting the driving unit and the bridge arm passes through a first common mode magnetic ring corresponding to the bridge arm.

[0016] In a possible implementation, the driving line directly passes through the first common mode magnetic ring, or

[0017] The driving line passes through the first common mode magnetic ring after being wound around the first common mode magnetic ring for at least one turn.

[0018] In a possible implementation manner, each bridge arm includes a plurality of the first common mode magnetic rings.

[0019] In a possible implementation, the driving unit and the first common-mode magnetic ring are both disposed on a driving board.

[0020] In a possible implementation, the main power unit includes at least one bridge arm, each bridge arm includes a first switch tube and a second switch tube, the first switch tube is electrically connected to the drive unit through a first drive line, and the second switch tube is electrically connected to the drive unit through a second drive line;

[0021] The common mode magnetic ring includes a second common mode magnetic ring corresponding to the first switch tube, and a third common mode magnetic ring corresponding to the second switch tube;

[0022] The first driving line passes through the second common mode magnetic ring, and the second driving line passes through the third common mode magnetic ring.

[0023] In a possible implementation, the first driving line directly passes through the second common mode magnetic ring, or the first driving line passes through the second common mode magnetic ring after being wound around the second common mode magnetic ring for at least one turn; and / or

[0024] The second driving line directly passes through the third common mode magnetic ring, or the second driving line is wound around the third common mode magnetic ring for at least one turn and then passes through the third common mode magnetic ring.

[0025] In a possible implementation, each of the first switching tubes includes a plurality of the second common-mode magnetic rings, and / or

[0026] For each of the second switching tubes, a plurality of the third common-mode magnetic rings are included.

[0027] In a possible implementation manner, the driving unit, the second common mode magnetic ring, and the third common mode magnetic ring are arranged on a driving board.

[0028] The beneficial effects of the utility model are as follows:

[0029] In the embodiment of the present application, since a filter is provided on the driving line connecting the driving unit and the main power unit, during the operation of the converter, the common-mode voltage can be suppressed by the filter, thereby reducing the interference of the common-mode voltage on the driving unit and improving the performance of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of a converter provided for related technology;

[0032] Figure 2 A schematic diagram of the structure of a converter provided in an embodiment of the utility model;

[0033] Figure 3 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0034] Figure 4 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0035] Figure 5 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0036] Figure 6 A schematic diagram of a drive line wound on a magnetic ring provided in an embodiment of the utility model;

[0037] Figure 7 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0038] Figure 8 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0039] Fig. 9 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0040] Fig.10 A schematic diagram of the structure of another converter provided in an embodiment of the utility model;

[0041] Fig.11 A schematic diagram of the structure of another converter provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In order to reduce the interference of the common-mode voltage on the driving unit in the inverter, an embodiment of the utility model provides a converter, which is provided with a filter on the driving line connecting the driving unit and the main power unit. The filter can suppress the common-mode voltage during the operation of the inverter, thereby reducing the interference of the common-mode voltage on the driving unit and improving the performance of the inverter.

[0044] The converter provided by the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0045] like Figure 2 As shown, a converter provided by an embodiment of the utility model includes: a common mode capacitor C2, a control unit 11, a drive unit 12, a main power unit 13 and a filter 14;

[0046] The common mode capacitor C2 is connected between the control unit 11 and the ground terminal;

[0047] The control unit 11 is also electrically connected to the drive unit 12;

[0048] The driving unit 12 is also electrically connected to the driving end of the main power unit 13 via a driving line;

[0049] The main power unit 13 is connected between the positive DC bus and the negative DC bus;

[0050] The filter 14 is provided on the driving line to suppress the common mode voltage.

[0051] In the embodiment of the present application, since a filter 14 is provided on the driving line connecting the driving unit 12 and the main power unit 13, during the operation of the converter, the common-mode voltage can be suppressed by the filter 14, thereby reducing the interference of the common-mode voltage on the driving unit 12 and improving the performance of the converter.

[0052] The converter in the present invention may be a PWM (Pulse Width Modulation) converter, or other converters, and the embodiments of the present invention do not impose any limitation on this.

[0053] In the specific implementation, Figure 3As shown, the converter further includes a DC bus capacitor C1, and the DC bus capacitor C1 is connected between the positive DC bus and the negative DC bus.

[0054] The main power unit 13 may include at least one bridge arm, such as Figure 2 and Figure 3 As shown, the main power unit 13 includes a bridge arm, such as Figure 4 As shown, the main power unit includes N bridge arms, where N is a positive integer greater than 2. If the main power unit 13 in the converter includes multiple bridge arms, each bridge arm is electrically connected to the drive unit 12 through a drive line. The drive unit 12 is used to drive the switch tube on each bridge arm in the main power unit 13, and the control unit 11 is used to control the drive unit 12 to drive the switch tube. The control unit 11 can be a DSP (Digital Signal Processor), and the DSP can be set on a DSP board.

[0055] The bridge arm in the embodiment of the utility model may be an IGBT (Insulate-Gate Bipolar Transistor) bridge arm, and the switch tube on each bridge arm may be an IGBT.

[0056] In implementation, Figure 4 As shown, each bridge arm includes two switch tubes connected in series, the first bridge arm includes a first switch tube T11 and a second switch tube T12 connected in series, and the Nth bridge arm includes a first switch tube TN1 and a second switch tube TN2 connected in series. For each bridge arm, the first end of the first switch tube is electrically connected to the positive DC bus, the second end of the first switch tube is electrically connected to the first end of the second switch tube, and the second end of the second switch tube is electrically connected to the negative DC bus. The control end of each switch tube and the second end of each switch tube are electrically connected to the drive unit 12 through a drive line. When the switch tube is an IGBT, the control end of the switch tube is the gate of the IGBT, the first section of the switch tube is the collector of the IGBT, and the second end of the switch tube is the emitter of the IGBT.

[0057] In one embodiment, the filter 14 can be a common-mode magnetic ring, which can be a manganese-zinc magnetic ring, a nickel-zinc magnetic ring, or a magnetic ring made of other materials. As long as the magnetic ring can suppress the common-mode voltage, it is applicable to the embodiments of the utility model.

[0058] In the embodiment of the utility model, the driving line passes through the common-mode magnetic ring to connect the driving unit 12 and the main power unit 13. During the operation of the converter, the common-mode magnetic ring can suppress the common-mode voltage.

[0059] In one embodiment, the main power unit 13 includes at least one bridge arm, each bridge arm includes a first switch tube and a second switch tube, for example, Figure 5 As shown, the first bridge arm includes a first switch tube T11 and a second switch tube T12, ... the Nth bridge arm includes a first switch tube TN1 and a second switch tube TN2;

[0060] The common mode magnetic ring includes a first common mode magnetic ring 141 corresponding to each bridge arm;

[0061] For each bridge arm, a driving line connecting the driving unit 12 and the bridge arm passes through the first common mode magnetic ring 141 corresponding to the bridge arm.

[0062] like Figure 5 As shown, the four driving lines corresponding to the first bridge arm pass through the first common mode magnetic ring 141 corresponding to the first bridge arm, ... the four driving lines corresponding to the Nth bridge arm pass through the first common mode magnetic ring 141 corresponding to the Nth bridge arm.

[0063] In a specific implementation, the driving line may directly pass through the first common mode magnetic ring 141 , or the driving line may be wound around the first common mode magnetic ring 141 for at least one turn and then pass through the first common mode magnetic ring 141 .

[0064] It should be noted that the driving line directly passes through the first common mode magnetic ring, that is, the driving line passes through the center of the first common mode magnetic ring, and the driving line passes through the first common mode magnetic ring 141 after being wound around the first common mode magnetic ring 141 for at least one turn, that is, the line is wound around the first common mode magnetic ring. Figure 6 As shown, one end of the wound wire is connected to the drive unit, and the other end is connected to the bridge arm. Figure 6 In the circuit, the drive wire is wound around the magnetic ring twice.

[0065] For each bridge arm, there may be one or more first common mode magnetic rings 141 .

[0066] like Figure 5 As shown, for any bridge arm, the first common mode magnetic ring 141 is one, such as Figure 7 As shown, for any bridge arm, there are three first common-mode magnetic rings 141 .

[0067] It should be noted that in the same converter, the number of first common-mode magnetic rings corresponding to different bridge arms may be the same or different. For example, Figure 8 As shown, the number of first common-mode magnetic rings corresponding to the first bridge arm is 1, and the number of first common-mode magnetic rings corresponding to the Nth bridge arm is 3. Of course, the number of turns of the first common-mode magnetic rings corresponding to different bridge arms may be the same or different, which will not be described here.

[0068] The driving unit 12 is usually disposed on a driving board. In a specific implementation, the first common mode magnetic ring 141 may also be disposed on the driving board.

[0069] In another embodiment, if Fig. 9 As shown, the main power unit 13 includes at least one bridge arm, each bridge arm includes a first switch tube and a second switch tube, wherein the first bridge arm includes a first switch tube T11 and a second switch tube T12, the Nth bridge arm includes a first switch tube TN1 and a second switch tube TN2, the first switch tube is electrically connected to the driving unit 12 through a first driving line, and the second switch tube is electrically connected to the driving unit 12 through a second driving line;

[0070] The common mode magnetic ring includes a second common mode magnetic ring 142 corresponding to the first switch tube, and a third common mode magnetic ring 143 corresponding to the second switch tube;

[0071] The first driving line passes through the second common mode magnetic ring 142 , and the second driving line passes through the third common mode magnetic ring 143 .

[0072] from Fig. 9 It can be seen from the figure that the first driving line and the second driving line each include two driving lines.

[0073] In a specific implementation, for each first switch tube, a plurality of second common-mode magnetic rings 142 are included; and / or

[0074] For each second switch tube, a plurality of third common-mode magnetic rings 143 are included.

[0075] like Fig.10 As shown, the first driving line passing through the three second common-mode magnetic rings 142 connects the first switch tube T11 and the drive unit 12, and the second driving line passing through the three third common-mode magnetic rings 143 connects the second switch tube T12 and the drive unit 12; ... the first driving line passing through the three second common-mode magnetic rings 142 connects the first switch tube TN1 and the drive unit 12, and the second driving line passing through the three third common-mode magnetic rings 143 connects the second switch tube TN2 and the drive unit 12.

[0076] In implementation, the first driving line may directly pass through the second common mode magnetic ring 142 , or may be wound around the second common mode magnetic ring 142 for at least one turn and then pass through the second common mode magnetic ring 142 .

[0077] The second driving line may directly pass through the third common mode magnetic ring 14 , or may be wound around the third common mode magnetic ring for at least one turn and then pass through the third common mode magnetic ring 143 .

[0078] The first driving line is wound around the second common mode magnetic ring for at least one turn, and the second driving line is wound around the third common mode magnetic ring for at least one turn. Figure 6 The winding method in will not be repeated here.

[0079] It should be noted that in the same converter, the number of common-mode magnetic rings corresponding to different switch tubes can be the same or different. For example, Fig.11As shown, the number of the second common-mode magnetic rings 142 corresponding to the first switch tube T11 is 1, the number of the third common-mode magnetic rings 143 corresponding to the second switch tube T12 is 3, the number of the second common-mode magnetic rings 142 corresponding to the first switch tube TN1 is 2, and the number of the third common-mode magnetic rings 143 corresponding to the second switch tube TN2 is 2. Of course, the number of turns of the common-mode magnetic rings corresponding to different switch tubes may be the same or different, which will not be described here.

[0080] In one embodiment, the driving unit 12 , the second common mode magnetic ring 142 , and the third common mode magnetic ring 143 may be disposed on a driving board.

[0081] The converter provided by the embodiment of the utility model is provided with a common-mode magnetic ring on the driving line connecting the driving unit and the switching tube. The number and number of turns of the common-mode magnetic rings can be flexibly set. The common-mode magnetic rings are used to suppress the common-mode voltage, thereby reducing the interference of the common-mode voltage on the driving unit and improving the performance of the converter.

[0082] Those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. A converter, characterized in that: include: Common mode capacitors, control units, drive units, main power units and filters; The common mode capacitor is connected between the control unit and the ground terminal; The control unit is also electrically connected to the drive unit; The driving unit is also electrically connected to the driving end of the main power unit via a driving line; The main power unit is connected between the positive DC bus and the negative DC bus; The filter is arranged on the driving line to suppress the common mode voltage.

2. The converter according to claim 1, characterized in that The filter includes a common mode magnetic ring; The common mode magnetic ring is a manganese zinc magnetic ring or a nickel zinc magnetic ring.

3. The converter according to claim 2, characterized in that The main power unit comprises at least one bridge arm, each bridge arm comprises a first switch tube and a second switch tube; The common mode magnetic ring includes a first common mode magnetic ring corresponding to each bridge arm; For each bridge arm, a driving line connecting the driving unit and the bridge arm passes through a first common mode magnetic ring corresponding to the bridge arm.

4. The converter according to claim 3, characterized in that The driving line directly passes through the first common mode magnetic ring, or The driving line passes through the first common mode magnetic ring after being wound around the first common mode magnetic ring for at least one turn.

5. The converter according to claim 4, characterized in that Each bridge arm includes a plurality of the first common mode magnetic rings.

6. The converter according to any one of claims 3 to 5, characterized in that: The driving unit and the first common-mode magnetic ring are both arranged on a driving board.

7. The converter according to claim 2, characterized in that The main power unit includes at least one bridge arm, each bridge arm includes a first switch tube and a second switch tube, the first switch tube is electrically connected to the drive unit through a first drive line, and the second switch tube is electrically connected to the drive unit through a second drive line; The common mode magnetic ring includes a second common mode magnetic ring corresponding to the first switch tube, and a third common mode magnetic ring corresponding to the second switch tube; The first driving line passes through the second common mode magnetic ring, and the second driving line passes through the third common mode magnetic ring.

8. The converter according to claim 7, characterized in that The first driving line directly passes through the second common mode magnetic ring, or the first driving line is wound around the second common mode magnetic ring for at least one turn and then passes through the second common mode magnetic ring; and / or The second driving line directly passes through the third common mode magnetic ring, or the second driving line is wound around the third common mode magnetic ring for at least one turn and then passes through the third common mode magnetic ring.

9. The converter according to claim 8, characterized in that For each first switch tube, a plurality of the second common-mode magnetic rings are included, and / or For each second switch tube, a plurality of the third common-mode magnetic rings are included.

10. The converter according to any one of claims 7 to 9, characterized in that: The driving unit, the second common mode magnetic ring and the third common mode magnetic ring are arranged on a driving board.

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