Double IGBT chopper

Abstract

The utility model relates to the technical field of welding power sources, and discloses a double-IGBT chopper which comprises a loop mainboard, a first drive board and a second drive board which are connected to a radiator, and a first IGBT module, a second IGBT module, a first absorption capacitor, a second absorption capacitor, a filter capacitor, a power source positive electrode copper bar, a power source negative electrode copper bar and an output copper bar which are connected to the loop mainboard. The first IGBT module and the second IGBT module are connected in parallel, the first IGBT module is electrically connected with the first driving board, and the second IGBT module is electrically connected with the second driving board; the utility model has the advantages of compact structure arrangement, high conductive efficiency, reduced stray inductance, effective reduction of contact heating, good heat dissipation performance, effective improvement of the maximum current allowed to pass through by a power supply, and realization of high-frequency large-current control.

Description

Technical Field

[0001] The utility model relates to the technical field of welding power supplies, in particular to a dual IGBT chopper. Background Art

[0002] The existing industrial-grade inverter power supplies generally use IGBT power devices with relatively mature technology. In the manufacturing process of high-end equipment such as nuclear power energy, aerospace, rail transportation, and ships, facing the diversity of manufacturing materials and the harshness of the construction environment, the industrial-grade welding power supply needs large devices to meet the requirements of high current and high frequency. The existing industrial-grade welding power supply is loosely arranged, has low conductivity, has large stray inductance, is prone to heat and malfunction, and the traditional industrial-grade welding power supply uses a single IGBT to control the welding current and welding voltage, and the current allowed to pass through a single IGBT is limited, which cannot meet the high current requirements. Utility Model Content

[0003] The purpose of the utility model is to provide a dual IGBT chopper with compact structure arrangement, high conductive efficiency, reduced stray inductance, effectively reduced contact heating and good heat dissipation performance, effectively increased the maximum current allowed to pass through the power supply, and realized high-frequency and large-current control.

[0004] The utility model is achieved in this way:

[0005] A dual IGBT chopper comprises a radiator, to which a circuit main board, a first drive board and a second drive board are connected, to which a first IGBT module, a second IGBT module, a first absorption capacitor, a second absorption capacitor, a filter capacitor, a positive power copper bar, a negative power copper bar, and an output copper bar are connected, the first IGBT module is connected in parallel with the second IGBT module, the first IGBT module is electrically connected to the first drive board, the second IGBT module is electrically connected to the second drive board, the first drive board and the second drive board are arranged in parallel at one end of the circuit main board, the first IGBT module and the second IGBT module are arranged in parallel, the first IGBT module is electrically connected to the positive power copper bar, the negative power copper bar, and the output copper bar, and the second IGBT module is electrically connected to the positive power copper bar, the negative power copper bar, and the output copper bar, and the second IGBT module is electrically connected to the positive power copper bar, the negative power copper bar, and the output copper bar. The GBT module is electrically connected to the positive power copper bar, the negative power copper bar, and the output copper bar. The positive power copper bar, the negative power copper bar, and the output copper bar are arranged in parallel above the first IGBT module and the second IGBT module. The first absorption capacitor is electrically connected to the first IGBT module, the positive power copper bar, and the negative power copper bar. The second absorption capacitor is electrically connected to the second IGBT module, the positive power copper bar, and the negative power copper bar. The first absorption capacitor is connected in parallel with the second absorption capacitor and is arranged above the positive power copper bar and the negative power copper bar. The filter capacitor is electrically connected to the positive power copper bar and the negative power copper bar, and is connected in parallel with the first absorption capacitor and the second absorption capacitor respectively. The filter capacitor is arranged around the first IGBT module and the second IGBT module.

[0006] Further, the first IGBT module includes a first IGBT switch and a second IGBT switch, the collector of the first IGBT switch is electrically connected to one end of the first absorption capacitor and the positive copper busbar of the power supply, the emitter of the first IGBT switch is electrically connected to the collector of the second IGBT switch and the output copper busbar, the gate and emitter of the first IGBT switch and the gate and emitter of the second IGBT switch are electrically connected to the first driving board, the emitter of the second IGBT switch is electrically connected to the other end of the first absorption capacitor, and the first absorption capacitor is arranged between the collector of the first IGBT switch and the emitter of the second IGBT switch.

[0007] Further, the second IGBT module includes a third IGBT switch and a fourth IGBT switch, the collector of the third IGBT switch is electrically connected to one end of the second absorption capacitor and the positive copper busbar of the power supply, the emitter of the third IGBT switch is electrically connected to the collector of the fourth IGBT switch and the output copper busbar, the gate and emitter of the third IGBT switch and the gate and emitter of the third IGBT switch are electrically connected to the second driving board, the emitter of the fourth IGBT switch is electrically connected to the other end of the second absorption capacitor, and the second absorption capacitor is arranged between the collector of the third IGBT switch and the emitter of the fourth IGBT switch.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] In practical applications, the first IGBT module and the second IGBT module are connected in parallel and then in series in the positive pole of the power supply and the welding output circuit to control the welding current and welding voltage, effectively increase the maximum current allowed by the power supply, and realize high-frequency and large-current control. The first driving board and the second driving board drive the first IGBT module and the second IGBT module respectively. The first absorption capacitor equivalent to capacitor C2 and the second absorption capacitor equivalent to capacitor C3 absorb the peak voltage on the bus when the first IGBT module and the second IGBT module are turned off. The filter capacitor equivalent to capacitor C1 includes multiple electrolytic capacitors connected in parallel, which are connected between the positive and negative poles of the power supply to filter the power supply. Function: The electrical connection between the first IGBT module and the second IGBT module is realized through the positive copper bus, the negative copper bus and the output copper bus, so that the distance between each device is as close as possible, the stray inductance is reduced, and the instability problem caused by the stray inductance interference caused by the excessive length of the previous connecting line can be effectively reduced. The positive copper bus and the negative copper bus as well as the output copper bus are arranged in parallel to shorten the power circuit. The radiator is used to enhance the heat dissipation performance of the circuit main board, the first drive board and the second drive board; the utility model has a compact structure, high conductivity efficiency, reduced stray inductance, effectively reduced contact heating and good heat dissipation performance, effectively increased the maximum current allowed by the power supply, and realized high-frequency and large-current control. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a top view of the overall structural schematic diagram of the utility model;

[0013] Figure 3 It is an equivalent circuit principle diagram of the utility model.

[0014] Figure numerals: radiator 1; circuit main board 2; first drive board 3; second drive board 4; first IGBT module 5; first IGBT switch 51; second IGBT switch 52; second IGBT module 6; third IGBT switch 61; fourth IGBT switch 62; first absorption capacitor 7; second absorption capacitor 8; filter capacitor 9; positive power supply copper bus 10; negative power supply copper bus 11; output copper bus 12. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0016] See also Figures 1 to 3, a dual IGBT chopper, comprising a radiator 1, to which a circuit main board 2, a first drive board 3 and a second drive board 4 are connected, to which a first IGBT module 5, a second IGBT module 6, a first absorption capacitor 7, a second absorption capacitor 8, a filter capacitor 9, a positive power copper bus 10, a negative power copper bus 11, and an output copper bus 12 are connected, the first IGBT module 5 is connected in parallel with the second IGBT module 6, the first IGBT module 5 is electrically connected to the first drive board 3, the second IGBT module 6 is electrically connected to the second drive board 4, the first drive board 3 and the second drive board 4 are arranged in parallel at one end of the circuit main board 2, the first IGBT module 5 and the second IGBT module 6 are arranged in parallel, the first IGBT module 5 is electrically connected to the positive power copper bus 10, the negative power copper bus 11, and the output copper bus 12, the second IGBT Module 6 is electrically connected to the positive power copper bar 10, the negative power copper bar 11, and the output copper bar 12. The positive power copper bar 10, the negative power copper bar 11, and the output copper bar 12 are all arranged in parallel above the first IGBT module 5 and the second IGBT module 6. The first absorption capacitor 7 is electrically connected to the first IGBT module 5, the positive power copper bar 10, and the negative power copper bar 11. The second absorption capacitor 8 is electrically connected to the second IGBT module 6, the positive power copper bar 10, and the negative power copper bar 11. The first absorption capacitor 7 is connected in parallel with the second absorption capacitor 8 and is both arranged above the positive power copper bar 10 and the negative power copper bar 11. The filter capacitor 9 is electrically connected to the positive power copper bar 10 and the negative power copper bar 11, and is respectively connected in parallel with the first absorption capacitor 7 and the second absorption capacitor 8. The filter capacitor 9 is arranged around the first IGBT module 5 and the second IGBT module 6.

[0017] In practical applications, see Figure 3The first IGBT module 5 and the second IGBT module 6 are connected in parallel and then connected in series in the positive pole of the power supply and the welding output circuit to control the welding current and welding voltage, effectively increase the maximum current allowed by the power supply, and realize high-frequency and large-current control. The first driving board 3 and the second driving board 4 drive the first IGBT module 5 and the second IGBT module 6 accordingly. The first absorption capacitor 7 equivalent to the capacitor C2 and the second absorption capacitor 8 equivalent to the capacitor C3 correspond to absorb the peak voltage on the bus when the first IGBT module 5 and the second IGBT module 6 are turned off. The filter capacitor 9 equivalent to the capacitor C1 includes a plurality of electrolytic capacitors connected in parallel, which are connected between the positive pole and the negative pole of the power supply to play the role of power supply filtering. The positive copper bus 10, the negative copper bus 11 and the output copper bus 12 realize the electrical connection between the first IGBT module 5 and the second IGBT module 6, so that the distance between each device is as close as possible, the stray inductance is reduced, and the instability problem caused by the stray inductance interference caused by the excessive length of the previous connecting line can be effectively reduced. The positive copper bus 10 and the negative copper bus 11 of the power supply and the output copper bus 12 are arranged in parallel to shorten the power supply circuit. The heat sink 1 is used to enhance the heat dissipation performance of the circuit main board 2, the first drive board 3 and the second drive board 4; the utility model has a compact structure, high conductivity efficiency, reduced stray inductance, effectively reduced contact heating and good heat dissipation performance, effectively increased the maximum current allowed by the power supply, and realized high-frequency and large-current control.

[0018] See also Figures 1 to 3 , the first IGBT module 5 includes a first IGBT switch 51 and a second IGBT switch 52, the collector of the first IGBT switch 51 is electrically connected to one end of the first absorption capacitor 7 and the positive copper busbar 10 of the power supply, the emitter of the first IGBT switch 51 is electrically connected to the collector of the second IGBT switch 52 and the output copper busbar 12, the gate and emitter of the first IGBT switch 51 and the gate and emitter of the second IGBT switch 52 are electrically connected to the first driving board 3, the emitter of the second IGBT switch 52 is electrically connected to the other end of the first absorption capacitor 7, and the first absorption capacitor 7 is arranged between the collector of the first IGBT switch 51 and the emitter of the second IGBT switch 52. In this embodiment, the first absorption capacitor 7 is arranged between the collector of the first IGBT switch 51 and the emitter of the second IGBT switch 52, so that the two ends of the first IGBT module 5 are closely adjacent, the stray inductance is reduced, and the IGBT switch oscillation and peak voltage are effectively reduced. The first IGBT switch 51 and the second IGBT switch 52 are connected in series, which effectively improves the operating frequency of the first IGBT module 5.

[0019] See also Figures 1 to 3, the second IGBT module 6 includes a third IGBT switch 61 and a fourth IGBT switch 62, the collector of the third IGBT switch 61 is electrically connected to one end of the second absorption capacitor 8 and the positive copper bar 10 of the power supply, the emitter of the third IGBT switch 61 is electrically connected to the collector of the fourth IGBT switch 62 and the output copper bar 12, the gate and emitter of the third IGBT switch 61 and the gate and emitter of the third IGBT switch 61 are electrically connected to the second driving board 4, the emitter of the fourth IGBT switch 62 is electrically connected to the other end of the second absorption capacitor 8, and the second absorption capacitor 8 is arranged between the collector of the third IGBT switch 61 and the emitter of the fourth IGBT switch 62. In this embodiment, the second absorption capacitor 8 is arranged between the collector of the third IGBT switch 61 and the emitter of the fourth IGBT switch 62, so that the two ends of the second IGBT module 6 are closely adjacent, the stray inductance is reduced, and the IGBT switch oscillation and peak voltage are effectively reduced. The third IGBT switch 61 and the fourth IGBT switch 62 are connected in series, which effectively increases the operating frequency of the first IGBT module 5.

[0020] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. Dual IGBT chopper, characterized by: The invention comprises a heat sink (1), the heat sink (1) is connected to a circuit main board (2), a first drive board (3) and a second drive board (4), the circuit main board (2) is connected to a first IGBT module (5), a second IGBT module (6), a first absorption capacitor (7), a second absorption capacitor (8), a filter capacitor (9), a positive power copper busbar (10), a negative power copper busbar (11) and an output copper busbar (12), the first IGBT module (5) and the second IGBT module (6) are connected in parallel, the first IGBT module (5) and the first drive board (3) are electrically connected, the second IGBT module (6) and the second drive board (4) are electrically connected, the first drive board (3) and the second drive board (4) are arranged in parallel at one end of the circuit main board (2), the first IGBT module (5) and the second IGBT module (6) are arranged in parallel, the first IGBT module (5) and the positive power copper busbar (10), the negative power copper busbar (11) and the output copper busbar (12) are all electrically connected, the second IGBT module (6) The first absorption capacitor (7) is electrically connected to the first IGBT module (5), the positive power copper bar (10), the negative power copper bar (11), and the output copper bar (12); the positive power copper bar (10), the negative power copper bar (11), and the output copper bar (12) are arranged in parallel above the first IGBT module (5) and the second IGBT module (6); the first absorption capacitor (7) is electrically connected to the first IGBT module (5), the positive power copper bar (10), and the negative power copper bar (11); the second absorption capacitor (8) is electrically connected to the second IGBT module (6); , a positive copper bar (10) for a power supply, and a negative copper bar (11) for a power supply; the first absorption capacitor (7) and the second absorption capacitor (8) are connected in parallel and are both arranged above the positive copper bar (10) for a power supply and the negative copper bar (11) for a power supply; the filter capacitor (9) is electrically connected to the positive copper bar (10) for a power supply and the negative copper bar (11) for a power supply, and is respectively connected in parallel with the first absorption capacitor (7) and the second absorption capacitor (8); the filter capacitor (9) is arranged around the first IGBT module (5) and the second IGBT module (6).

2. The dual IGBT chopper according to claim 1, characterized in that: The first IGBT module (5) comprises a first IGBT switch (51) and a second IGBT switch (52); the collector of the first IGBT switch (51) is electrically connected to one end of a first absorption capacitor (7) and a positive copper busbar (10); the emitter of the first IGBT switch (51) is electrically connected to the collector of the second IGBT switch (52) and an output copper busbar (12); the gate and emitter of the first IGBT switch (51) and the gate and emitter of the second IGBT switch (52) are electrically connected to the first driving board (3); the emitter of the second IGBT switch (52) is electrically connected to the other end of the first absorption capacitor (7); and the first absorption capacitor (7) is arranged between the collector of the first IGBT switch (51) and the emitter of the second IGBT switch (52).

3. The dual IGBT chopper according to claim 1, characterized in that: The second IGBT module (6) comprises a third IGBT switch (61) and a fourth IGBT switch (62); the collector of the third IGBT switch (61) is electrically connected to one end of the second absorption capacitor (8) and a positive copper busbar (10) of the power supply; the emitter of the third IGBT switch (61) is electrically connected to the collector of the fourth IGBT switch (62) and an output copper busbar (12); the gate and emitter of the third IGBT switch (61) and the gate and emitter of the third IGBT switch (61) are electrically connected to the second driving board (4); the emitter of the fourth IGBT switch (62) is electrically connected to the other end of the second absorption capacitor (8); and the second absorption capacitor (8) is arranged between the collector of the third IGBT switch (61) and the emitter of the fourth IGBT switch (62).

Images