Single IGBT chopper

Abstract

The utility model relates to the technical field of welding power sources, and discloses a single IGBT chopper which comprises a radiator, a driving board, an absorption resistor and a loop mainboard are connected to the radiator, and the absorption resistor is arranged between the driving board and the radiator and between the loop mainboard and the radiator. A power supply anode copper bar, a power supply cathode copper bar, an output copper bar, a first absorption copper bar, a second absorption copper bar, an IGBT switch, an absorption capacitor, a filter capacitor, an absorption diode and a fly-wheel diode are arranged on the loop mainboard; the structure is compact in arrangement, is high in conductive efficiency, reduces the stray inductance, effectively reduces the contact heating, and is good in heat dissipation performance.

Description

Technical Field

[0001] The utility model relates to the technical field of welding power supplies, in particular to a single 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, the manufacturing materials are diverse and the construction environment is harsh. In order to meet the high current and high frequency, the industrial-grade welding power supply requires a relatively large device. The existing industrial-grade welding power supply is loosely arranged, has low conductivity, has a large stray inductance, and is prone to heat and failure. Utility Model Content

[0003] The utility model aims to provide a single IGBT chopper with compact structure arrangement, high conductive efficiency, reduced stray inductance, effectively reduced contact heating and good heat dissipation performance.

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

[0005] A single IGBT chopper comprises a heat sink, to which a driving board, an absorption resistor and a circuit main board are connected, and the absorption resistor is arranged between the driving board, the circuit main board and the heat sink;

[0006] The circuit main board is provided with a power positive copper bar, a power negative copper bar, an output copper bar, a first absorption copper bar, a second absorption copper bar, an IGBT switch, an absorption capacitor, a filter capacitor, and an absorption diode.

[0007] The IGBT switch is fixedly connected to the middle of the circuit main board, the gate and drain of the IGBT switch are electrically connected to the driving board, the collector of the IGBT switch is electrically connected to one end of the first absorption copper bar, the emitter of the IGBT switch is electrically connected to one end of the second absorption copper bar, and the first absorption copper bar and the second absorption copper bar are both arranged above the IGBT switch.

[0008] The other end of the first absorption copper bar is connected to one end of the absorption capacitor and one end of the positive copper bar of the power supply, the absorption capacitor is arranged above the first absorption copper bar, the other end of the absorption capacitor is electrically connected to one end of the absorption resistor, the positive copper bar of the power supply is electrically connected to one end of the filter capacitor at one end connected to the first absorption copper bar, and the positive copper bar of the power supply is arranged close to the IGBT switch,

[0009] The other end of the second absorption copper bar is electrically connected to the cathode of the absorption diode and one end of the output copper bar, the anode of the absorption diode is electrically connected to one end of the absorption capacitor and the absorption resistor, the absorption diode is arranged close to the second absorption copper bar, and the output copper bar is arranged in parallel with the second absorption copper bar.

[0010] The negative copper bar of the power supply is electrically connected to the other end of the filter capacitor and the other end of the absorption resistor. The negative copper bar of the power supply is arranged above the output copper bar and in parallel with the positive copper bar of the power supply. The filter capacitor is arranged around the positive copper bar of the power supply, the negative copper bar of the power supply, the output copper bar, the first absorption copper bar, the second absorption copper bar, the IGBT switch, the absorption capacitor, and the absorption diode.

[0011] Furthermore, the absorption capacitor includes a plurality of parallel non-polar capacitors, and the absorption capacitor is fixedly connected to the IGBT switch via a first absorption copper bus and is disposed between the collector and emitter of the IGBT switch.

[0012] Furthermore, the absorption resistor includes a plurality of power resistors connected in parallel and connected in series with the absorption capacitor. The absorption resistor is connected to a resistance pressure plate, and the resistance pressure plate is connected to the heat sink.

[0013] Furthermore, a freewheeling diode is also provided on the circuit main board, the cathode of the freewheeling diode is electrically connected to one end of the output copper bus and the second absorption copper bus, the anode of the freewheeling diode is electrically connected to the negative copper bus of the power supply, and the freewheeling diode is arranged close to the output copper bus.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The driver board is used to generate a PWM control signal and drive the IGBT switch. The IGBT switch is connected in series in the positive electrode of the power supply and the output circuit to control the welding current and welding voltage. The absorption capacitor equivalent to the capacitor C3 is connected in series with the absorption resistor equivalent to the resistor R1, and is combined with the absorption diode equivalent to the diode D1 to absorb the peak voltage on the bus when the chopper is turned off. The filter capacitor includes a plurality of electrolytic capacitors in parallel, that is, the equivalent capacitor C1 and the capacitor C2 are connected between the positive electrode and the negative electrode of the power supply to play the role of power supply filtering;

[0016] The absorption capacitor is supported and fixed by the first absorption copper bar, the positive copper bar of the power supply located above the second absorption copper bar is in an "L" shape, and the negative copper bar of the power supply located above the output copper bar can be connected and fixed to the loop main board through the support column. The positive copper bar of the power supply and the negative copper bar of the power supply are arranged in parallel to reduce the power supply loop. The power supply structure is tightly arranged to minimize the contact resistance, increase the conductivity, and reduce stray inductance. It can effectively reduce the faults caused by contact heating of the connecting wires in the past. The heat sink can dissipate heat for the driving board, the loop main board and the absorption resistor at the same time, and can also avoid the faults caused by contact heating. The utility model has a tight structure arrangement, high conductivity, and reduces stray inductance, effectively reduces contact heating and has good heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic top view of the overall structure of the utility model;

[0020] Figure 3 It is an equivalent circuit principle diagram of the utility model.

[0021] Figure numerals: heat sink 1; drive board 2; absorption resistor 3; circuit main board 4; power supply positive copper bar 5; power supply negative copper bar 6; output copper bar 7; first absorption copper bar 8; second absorption copper bar 9; IGBT switch 10; absorption capacitor 11; filter capacitor 12; absorption diode 13; freewheeling diode 14; resistor pressure plate 15. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figures 1 to 3 , a single IGBT chopper, comprising a heat sink 1, to which a driving board 2, an absorption resistor 3 and a circuit main board 4 are connected, and the absorption resistor 3 is arranged between the driving board 2 and the circuit main board 4 and the heat sink 1;

[0024] The circuit main board 4 is provided with a power positive copper bar 5, a power negative copper bar 6, an output copper bar 7, a first absorption copper bar 8, a second absorption copper bar 9, an IGBT switch 10, an absorption capacitor 11, a filter capacitor 12, and an absorption diode 13.

[0025] The IGBT switch 10 is fixedly connected to the middle of the circuit main board 4, the gate and drain of the IGBT switch 10 are electrically connected to the driving board 2, the collector of the IGBT switch 10 is electrically connected to one end of the first absorption copper bar 8, the emitter of the IGBT switch 10 is electrically connected to one end of the second absorption copper bar 9, and the first absorption copper bar 8 and the second absorption copper bar 9 are both arranged above the IGBT switch 10.

[0026] The other end of the first absorption copper bar 8 is connected to one end of the absorption capacitor 11 and one end of the positive power copper bar 5. The absorption capacitor 11 is arranged above the first absorption copper bar 8. The other end of the absorption capacitor 11 is electrically connected to one end of the absorption resistor 3. The positive power copper bar 5 is electrically connected to one end of the filter capacitor 12 at one end connected to the first absorption copper bar 8. The positive power copper bar 5 is arranged close to the IGBT switch 10.

[0027] The other end of the second absorption copper bar 9 is electrically connected to the cathode of the absorption diode 13 and one end of the output copper bar 7, the anode of the absorption diode 13 is electrically connected to one end of the absorption capacitor 11 connected to the absorption resistor 3, the absorption diode 13 is arranged close to the second absorption copper bar 9, and the output copper bar 7 is arranged in parallel with the second absorption copper bar 9.

[0028] The negative copper bar 6 of the power supply is electrically connected to the other end of the filter capacitor 12 and the other end of the absorption resistor 3. The negative copper bar 6 of the power supply is arranged above the output copper bar 7 and is arranged in parallel with the positive copper bar 5 of the power supply. The filter capacitor 12 is arranged around the positive copper bar 5 of the power supply, the negative copper bar 6 of the power supply, the output copper bar 7, the first absorption copper bar 8, the second absorption copper bar 9, the IGBT switch 10, the absorption capacitor 11, and the absorption diode 13.

[0029] In practical applications, see Figure 3 The driving board 2 is used to generate a PWM control signal and drive an IGBT switch 10. The IGBT switch 10 is connected in series in the positive electrode of the power supply and the output circuit to control the welding current and the welding voltage. The absorption capacitor 11 equivalent to the capacitor C3 is connected in series with the absorption resistor 3 equivalent to the resistor R1, and is combined with the absorption diode 13 equivalent to the diode D1 to absorb the peak voltage on the bus when the chopper is turned off. The filter capacitor 12 includes a plurality of electrolytic capacitors connected in parallel, that is, the equivalent capacitor C1 and the capacitor C2 are connected between the positive electrode and the negative electrode of the power supply to play the role of power supply filtering;

[0030] The absorption capacitor 11 is supported and fixed by the first absorption copper bar 8, the positive copper bar 5 of the power supply located above the second absorption copper bar 9 is in an "L" shape, and the negative copper bar 6 of the power supply located above the output copper bar 7 can be connected and fixed to the loop main board 4 through a support column. The positive copper bar 5 of the power supply and the negative copper bar 6 of the power supply are arranged in parallel to reduce the power supply loop. The power supply structure is tightly arranged to minimize the contact resistance, increase the conductivity, reduce stray inductance, and effectively reduce the faults caused by contact heating of the connecting wires in the past. The heat sink 1 simultaneously dissipates the heat of the drive board 2, the loop main board 4 and the absorption resistor 3, and can also avoid the faults caused by contact heating. The utility model has a tight structure arrangement, high conductivity, reduced stray inductance, effectively reduces contact heating and has good heat dissipation performance.

[0031] See also Figures 1 to 3The absorption capacitor 11 includes a plurality of parallel non-polar capacitors, which are fixedly connected to the IGBT switch 10 through the first absorption copper bar 8 and arranged between the collector and emitter of the IGBT switch 10. In this embodiment, the absorption capacitor 11 absorbs the peak voltage on the bus when the chopper is turned off through a plurality of parallel non-polar capacitors, and is arranged between the collector and emitter of the IGBT switch 10, so that it is closely adjacent to the collector and emitter of the IGBT switch 10, so as to better absorb the voltage spike.

[0032] See also Figures 1 to 3 , the absorption resistor 3 includes a plurality of parallel power resistors, which are connected in series with the absorption capacitor 11, and the absorption resistor 3 is connected with a resistor pressure plate 15, and the resistor pressure plate 15 is connected to the heat sink 1. In this embodiment, the absorption resistor 3 is connected in series with the absorption capacitor 11 through a plurality of parallel power resistors, and is discharged through the absorption diode 13 to absorb the peak voltage on the bus when the chopper is turned off. The absorption resistor 3 is installed on the heat sink 1 through the resistor pressure plate 15, and the absorption resistor 3 is cooled at the same time.

[0033] See also Figures 1 to 3 The circuit main board 4 is also provided with a flyback diode 14, the cathode of the flyback diode 14 is electrically connected to one end of the output copper bar 7 and the second absorption copper bar 9, the anode of the flyback diode 14 is electrically connected to the negative copper bar 6 of the power supply, and the flyback diode 14 is arranged close to the output copper bar 7. In this embodiment, when a sudden voltage is generated at the output end, the flyback diode 14 equivalent to the diode D2 allows the current to change more smoothly, avoiding the transmission of a surge voltage and damaging other components.

[0034] 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. Single IGBT chopper, characterized by: The invention comprises a heat sink (1), to which a driving board (2), an absorption resistor (3) and a circuit main board (4) are connected, and the absorption resistor (3) is arranged between the driving board (2), the circuit main board (4) and the heat sink (1); The circuit main board (4) is provided with a power supply positive copper bar (5), a power supply negative copper bar (6), an output copper bar (7), a first absorption copper bar (8), a second absorption copper bar (9), an IGBT switch (10), an absorption capacitor (11), a filter capacitor (12), and an absorption diode (13). The IGBT switch (10) is fixedly connected to the middle of the circuit main board (4); the gate and drain of the IGBT switch (10) are electrically connected to the driving board (2); the collector of the IGBT switch (10) is electrically connected to one end of the first absorption copper bar (8); the emitter of the IGBT switch (10) is electrically connected to one end of the second absorption copper bar (9); the first absorption copper bar (8) and the second absorption copper bar (9) are both arranged above the IGBT switch (10); The other end of the first absorption copper bar (8) is connected to one end of the absorption capacitor (11) and one end of the power positive copper bar (5); the absorption capacitor (11) is arranged above the first absorption copper bar (8); the other end of the absorption capacitor (11) is electrically connected to one end of the absorption resistor (3); one end of the power positive copper bar (5) connected to the first absorption copper bar (8) is electrically connected to one end of the filter capacitor (12); the power positive copper bar (5) is arranged close to the IGBT switch (10); The other end of the second absorption copper bar (9) is electrically connected to the cathode of the absorption diode (13) and one end of the output copper bar (7), the anode of the absorption diode (13) is electrically connected to one end of the absorption capacitor (11) and the absorption resistor (3), the absorption diode (13) is arranged close to the second absorption copper bar (9), and the output copper bar (7) and the second absorption copper bar (9) are arranged in parallel. The power supply negative copper bar (6) is electrically connected to the other end of the filter capacitor (12) and the other end of the absorption resistor (3); the power supply negative copper bar (6) is arranged above the output copper bar (7) and in parallel with the power supply positive copper bar (5); the filter capacitor (12) is arranged around the power supply positive copper bar (5), the power supply negative copper bar (6), the output copper bar (7), the first absorption copper bar (8), the second absorption copper bar (9), the IGBT switch (10), the absorption capacitor (11), and the absorption diode (13).

2. The single IGBT chopper according to claim 1, characterized in that: The absorption capacitor (11) comprises a plurality of parallel-connected non-polar capacitors. The absorption capacitor (11) is fixedly connected to the IGBT switch (10) via a first absorption copper bar (8) and is arranged between the collector and emitter of the IGBT switch (10).

3. The single IGBT chopper according to claim 1, characterized in that: The absorption resistor (3) comprises a plurality of power resistors connected in parallel and connected in series with the absorption capacitor (11); the absorption resistor (3) is connected to a resistance pressure plate (15); and the resistance pressure plate (15) is connected to the heat sink (1).

4. The single IGBT chopper according to claim 1, characterized in that: A freewheeling diode (14) is also provided on the circuit main board (4); the cathode of the freewheeling diode (14) is electrically connected to one end of the output copper busbar (7) and the second absorption copper busbar (9); the anode of the freewheeling diode (14) is electrically connected to the negative copper busbar (6) of the power supply; and the freewheeling diode (14) is provided close to the output copper busbar (7).

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