CN211089475U - Parallel structure of electric locomotive four-quadrant power module IGBT - Google Patents
Parallel structure of electric locomotive four-quadrant power module IGBT Download PDFInfo
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- CN211089475U CN211089475U CN201922083797.7U CN201922083797U CN211089475U CN 211089475 U CN211089475 U CN 211089475U CN 201922083797 U CN201922083797 U CN 201922083797U CN 211089475 U CN211089475 U CN 211089475U
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Abstract
The utility model relates to a parallel structure of electric locomotive four-quadrant power module IGBT, including parallelly connected IGBT module and four-quadrant power module, the bridge arm of IGBT module is H1 and H3 parallelly connected, and B1 and B3 are parallelly connected, realize parallelly connected symmetry on the electrical principle; the packaging design of the IGBT module is a laminated busbar, and an insulating support seat is arranged on the laminated busbar and used for supporting the weight of the laminated busbar; the IGBT modules are two IGBTs with the closest VGE (th), VCE (sat) and VF parameters selected from the same manufacturer, the same model and the same batch and are paired; the four-quadrant power module is separated from a configuration board by adopting a driving board, two IGBT modules in a parallel state share one driving board, independent configuration boards are respectively used for adjusting the peripheral capacitance mode of grid electrodes of the configuration boards, so that control signals received by the IGBT modules with different parameters are kept synchronous, and the configuration boards are provided with protection devices. The utility model has the advantages that, economy is reliable, electric principle and structural layout symmetry, IGBT module parameter unanimous, drive signal are synchronous.
Description
Technical Field
The utility model belongs to the electric locomotive field, concretely relates to parallel structure of electric locomotive four-quadrant power module IGBT.
Background
At present, a key part in a transmission system in rail transit technical equipment is a traction converter, and a power electronic device is one of the most core devices in the converter. An IGBT (insulated gate bipolar transistor) is widely used as a controllable device in traction converters and various auxiliary converters in rail transit, and an IGBT module in the traction converter carries all output currents, so that the currents passed by the IGBT are considerable. However, the existing electric locomotive IGBT module has the following disadvantages:
1) in the application field of rail transit, a main circuit (from a direct current capacitor to an IGBT module) has large stray inductance, and if a strong magnetic field exists nearby the IGBT module, the current sharing of the module can be influenced. If two IGBT modules are connected in parallel and installed in parallel, if the output cable of the alternating current row is close to one IGBT module and far away from the other IGBT module when being placed, the current sharing performance is problematic, and the phenomenon is caused by the fact that a magnetic field is generated when a certain large current flows on a lead, and the extrusion or attraction effect is generated on other conducted currents in the magnetic field; therefore, when the structure is designed, a large amount of bending is bound to exist in the wiring mode or the copper bar wiring, and a large stray inductance is formed.
2) The turn-on threshold voltages VGE (th) and VCE (sat) of the IGBT have individual difference, the IGBT with low VGE (th) is turned on firstly under the same gate voltage to bear most of the current in the circuit, and if the current is too large and exceeds the rated current value, the damage of the IGBT can be caused, so that the fault of the whole circuit is caused; when the IGBTs are used in parallel, the smaller the vce (sat), the larger the current borne by the IGBT module is, the more the vce (sat) of the two IGBT modules must be balanced, otherwise, the current of the two IGBTs is unbalanced and damaged at the moment of turning on the IGBTs. Similarly, when the rectifier bridge is used as a rectifier bridge, the on-state voltage VF of the diode needs to be considered.
3) The non-synchronization of the output gate driving signals of the driving circuit also causes the transient current distribution of the IGBT when the IGBT is turned on and off to be unbalanced. The control signal of the driving circuit is transmitted through a series of electronic elements, wires and a grid resistor and finally reaches the grid of the IGBT, the grid driving signal has certain time difference in the process, the parallel IGBTs are turned on and off at different time nodes, the IGBT which is turned on first or turned off later bears larger overcurrent, and if the current is too large and exceeds a rated current value, the IGBT can be damaged, so that the whole circuit is in fault.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, provide an electric locomotive four-quadrant power module IGBT's parallelly connected structure that economy is reliable, electric principle and structural layout symmetry, IGBT module parameter are unanimous, drive signal is synchronous.
In order to achieve the above object, the utility model provides a following technical scheme:
a parallel structure of an IGBT (insulated gate bipolar transistor) of a four-quadrant power module of an electric locomotive comprises the IGBT module and the four-quadrant power module which are connected in parallel, bridge arms of the IGBT module are connected in parallel by H1 and H3, and bridge arms of the IGBT module are connected in parallel by B1 and B3, so that the parallel symmetry on the electrical principle is realized; the packaging design of the IGBT module is a laminated busbar, and an insulating support seat is arranged on the laminated busbar and used for supporting the weight of the laminated busbar;
the four-quadrant power module is separated from a configuration board by adopting a driving board, two IGBT modules in a parallel state share one driving board, independent configuration boards are respectively used for adjusting the peripheral capacitance mode of grid electrodes of the configuration boards, so that control signals received by the IGBT modules with different parameters are kept synchronous, and the configuration boards are provided with protection devices.
Further, the laminated busbar is a three-layer busbar which is respectively S1, S2 and S3.
Furthermore, the IGBT modules are two IGBTs with the closest vge (th), vce (sat), and VF parameters selected from the same manufacturer, the same model, and the same batch, and are paired.
Further, the IGBT module includes an IGBT chip and a diode chip.
Furthermore, the parallel IGBT modules are used for realizing diode current sharing when the four-quadrant module works as a rectifier bridge function, and realizing IGBT current sharing when the four-quadrant module is used as an energy feedback function.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses four-quadrant power module designs the stromatolite female row according to the conventional encapsulation of high-power IGBT, according to parallelly connected IGBT topology design three-layer female row, has realized the symmetry of the equivalent resistance of the parallelly connected branch road of IGBT module, stray inductance on structural layout, and the stromatolite female row can effectively reduce stray inductance; one bridge arm H1 of the parallel IGBT module is connected with H3 in parallel, B1 of the parallel IGBT module is connected with B3 of the parallel IGBT module in parallel, and the parallel connection symmetry is realized on the electrical principle; and the laminated busbar is provided with an insulating support seat for supporting the weight of the laminated busbar so as to protect the IGBT module. The IGBT modules are two IGBTs with the closest VGE (th), VCE (sat) and VF parameters selected from the same manufacturer, the same model and the same batch and are paired for parallel connection of the IGBTs, so that the individual difference of the IGBTs is effectively reduced; the four-quadrant power module adopts a mode of separating a driving plate from a configuration plate, two IGBT modules in a parallel state share 1 driving plate, the driving plates respectively use independent configuration plates, cable manufacturers, models and lengths from the driving plates to the configuration plates are consistent, control signals received by the IGBT modules with different parameters are kept synchronous by adjusting peripheral capacitance of grid electrodes of the configuration plates, and the configuration plates are provided with various protection devices to ensure that the IGBT modules are in a safe working range.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the description of the embodiment will be briefly introduced below, it is obvious that the drawings in the following description are only for more clearly illustrating the embodiment of the present invention or the technical solution in the prior art, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a topological diagram of the parallel IGBT of the present invention;
fig. 2 is a schematic diagram of a laminated busbar of a four-quadrant power module according to the present invention;
fig. 3 is a schematic view of the driving separation of the present invention;
FIG. 4 is a circuit diagram of the configuration board of the present invention;
in the figure: 1-laminated busbar, 2-driving plate, 3-configuration plate and 4-insulating supporting seat.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described with reference to the following specific embodiments, which are provided as illustration only and are not intended to limit the present invention.
A parallel structure of IGBT of four-quadrant power module of electric locomotive, in HXD2 type electric locomotive four-quadrant power module's practical application, factors such as comprehensive consideration economy, reliability, adopt two IGBT module parallel technology in order to satisfy preceding, back level power demand.
The utility model discloses electric locomotive four-quadrant power module's parallelly connected use of IGBT module, must keep two parallelly connected IGBT modules symmetry as far as possible, unanimous, the drive signal synchronization of electric principle and structural layout symmetry, IGBT module parameter. The utility model discloses solution to above problem is:
1. the electrical principle and the structural layout are symmetrical:
the utility model discloses parallelly connected realization scheme of electric locomotive four-quadrant power module IGBT is shown as figure 1:
in fig. 1, one arm of the parallel IGBT module is shown, wherein H1 and H3 are connected in parallel, and B1 and B3 are connected in parallel, so that the parallel symmetry is realized in the electrical principle.
Because the IGBT module internally comprises the IGBT chip and the diode chip, when the four-quadrant module works as a rectifier bridge function, the diode current sharing needs to be considered; when the four-quadrant module is used as an energy feedback function, the current sharing of the IGBTs needs to be considered, and if the currents of the two modules are not uniform, the module with large circulating current can be damaged due to overcurrent.
In the application field of rail transit, a main circuit (from a direct current capacitor to an IGBT module) has large stray inductance, and if a strong magnetic field exists nearby the IGBT module, the current sharing of the module can be influenced. If two IGBT modules are connected in parallel and installed in parallel, if the output cable of the alternating current row is close to one IGBT module and far away from the other IGBT module when being placed, the current sharing performance is problematic, and the phenomenon is caused by the fact that a magnetic field is generated when a certain large current flows on a lead, and the extrusion or attraction effect is generated on other conducted currents in the magnetic field; therefore, when the structure is designed, a large amount of bending is bound to exist in the wiring mode or the copper bar wiring, and a large stray inductance is formed.
The utility model discloses electric locomotive four-quadrant power module is female arranging 1 according to high-power IGBT' S conventional encapsulation design stromatolite, female arranging according to parallelly connected IGBT topology design three-layer, is S1, S2, S3 respectively, has realized the equivalent resistance of the parallelly connected branch road of IGBT module, the symmetry of stray inductance on structural layout, and female arranging 1 of stromatolite can effectively reduce stray inductance.
In addition, consider that the female row of stromatolite 1 material uses copper to be great as main autogenous weight, for protection IGBT safety, the utility model discloses still be equipped with insulating supporting seat 4 for support the female row of stromatolite 1 weight, with the protection IGBT module. The laminated busbar 1 is structured as shown in fig. 2.
2. Parameters of the IGBT modules are consistent:
the turn-on threshold voltages VGE (th) and VCE (sat) of the IGBT have individual difference, the IGBT with low VGE (th) is turned on firstly under the same gate voltage to bear most of the current in the circuit, and if the current is too large and exceeds the rated current value, the damage of the IGBT can be caused, so that the fault of the whole circuit is caused; when the IGBTs are used in parallel, the smaller the vce (sat), the larger the current borne by the IGBT module is, the more the vce (sat) of the two IGBT modules must be balanced, otherwise, the current of the two IGBTs is unbalanced and damaged at the moment of turning on the IGBTs. Similarly, when the rectifier bridge is used as a rectifier bridge, the on-state voltage VF of the diode needs to be considered.
Because the parameters are inherent properties of the IGBT module and have individual differences, the IGBT needs to be screened when the IGBT parallel bridge arms are used, and the screening process is particularly important. In order to reduce the individual difference of the IGBTs, in the parallel application of the four-quadrant power module IGBTs of the HXD2 type electric locomotive, the IGBTs are selected from the same manufacturer, the same model and the same batch. And carrying out a switch test on the IGBTs, detecting VGE (th), VCE (sat) and VF of the IGBT module, selecting two IGBTs with the closest parameters for pairing, and using the IGBTs for parallel connection.
3. Drive signal synchronization
The non-synchronization of the output gate driving signals of the driving circuit also causes the transient current distribution of the IGBT when the IGBT is turned on and off to be unbalanced. The control signal of the driving circuit is transmitted through a series of electronic elements, wires and a grid resistor and finally reaches the grid of the IGBT, the grid driving signal has certain time difference in the process, the parallel IGBTs are turned on and off at different time nodes, the IGBT which is turned on first or turned off later bears larger overcurrent, and if the current is too large and exceeds a rated current value, the IGBT can be damaged, so that the whole circuit is in fault.
In order to ensure that the control signal that parallelly connected IGBT module grid received remains synchronous throughout, the utility model discloses electric locomotive four-quadrant power module adopts the mode (like fig. 3) of drive plate 2 and the 3 separation of configuration board, 2 IGBT modules sharing drive plate 2 that are in the parallel state, respectively use independent configuration board 3, the cable manufacturer of drive plate 2 to configuration board 3, the model, length are unanimous, through the mode (like fig. 4) of adjusting the peripheral electric capacity of 3 grids of configuration board, make the control signal that the IGBT module that the parameter has the difference receives keep synchronous, be equipped with various protection devices on the configuration board 3, guarantee that the IGBT module is in safe working range.
The present invention is not described in detail in the prior art.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A parallel structure of an IGBT (insulated gate bipolar transistor) of a four-quadrant power module of an electric locomotive comprises the IGBT module and the four-quadrant power module which are connected in parallel, and is characterized in that bridge arms of the IGBT module are connected in parallel by H1 and H3, and are connected in parallel by B1 and B3, so that the parallel symmetry on the electrical principle is realized; the packaging design of the IGBT module is a laminated busbar (1), and an insulating support seat (4) is arranged on the laminated busbar (1) and used for supporting the weight of the laminated busbar (1);
the four-quadrant power module is characterized in that a driving plate and a configuration plate are separated, two IGBT modules in a parallel state share one driving plate (2), independent configuration plates (3) are respectively used, a grid peripheral capacitance mode of the configuration plates (3) is adjusted, control signals received by the IGBT modules with different parameters are kept synchronous, and the configuration plates (3) are provided with protection devices.
2. The parallel structure of the electric locomotive four-quadrant power module IGBT according to claim 1, characterized in that the laminated busbar (1) is a three-layer busbar which is S1, S2 and S3 respectively.
3. The parallel connection structure of the IGBT of the four-quadrant power module of the electric locomotive as claimed in claim 1, wherein the IGBT module is a pair of two IGBTs with the closest parameters of VGE (th), VCE (sat) and VF selected from the same manufacturer, the same model and the same batch.
4. The parallel connection structure of the electric locomotive four-quadrant power module IGBT as claimed in claim 1, wherein the IGBT module comprises an IGBT chip and a diode chip.
5. The parallel connection structure of the four-quadrant power module IGBT of the electric locomotive according to any one of claims 1 to 4, characterized in that the parallel IGBT module is used for realizing diode current sharing when the four-quadrant module is used as a rectifier bridge function and realizing IGBT current sharing when the four-quadrant module is used as an energy feeding function.
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| CN201922083797.7U CN211089475U (en) | 2019-11-28 | 2019-11-28 | Parallel structure of electric locomotive four-quadrant power module IGBT |
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| CN201922083797.7U CN211089475U (en) | 2019-11-28 | 2019-11-28 | Parallel structure of electric locomotive four-quadrant power module IGBT |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115766908A (en) * | 2021-09-02 | 2023-03-07 | 中车株洲电力机车研究所有限公司 | Communication protocol signal driving circuit, parallel interface circuit and high-voltage frequency converter |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115766908A (en) * | 2021-09-02 | 2023-03-07 | 中车株洲电力机车研究所有限公司 | Communication protocol signal driving circuit, parallel interface circuit and high-voltage frequency converter |
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