CN214125136U - Pulse distribution system for realizing power module topological structure compatibility - Google Patents
Pulse distribution system for realizing power module topological structure compatibility Download PDFInfo
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- CN214125136U CN214125136U CN202120246665.6U CN202120246665U CN214125136U CN 214125136 U CN214125136 U CN 214125136U CN 202120246665 U CN202120246665 U CN 202120246665U CN 214125136 U CN214125136 U CN 214125136U
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Abstract
The application provides a pulse distribution system for realizing power module topological structure compatibility, which comprises: the device comprises a pulse distributor, at least one external short circuit module, at least four drivers respectively connected with the pulse distributor and at least four IGBTs respectively connected with the at least four drivers; every two IGBTs are connected with each other to form a half bridge, and the half bridge at least comprises a first half bridge and a second half bridge; the external short circuit module is respectively connected with the first half bridge and the second half bridge and can be switched between a short circuit state and an open circuit state; when the external short circuit module is in a short circuit state, the first half bridge and the second half bridge form a half-bridge two-parallel topological structure; when the external short circuit module is in an open circuit state, the first half bridge and the second half bridge form a single-phase bridge topology structure. The switching between the half-bridge parallel topology and the single-phase bridge topology can be realized, and the cost and the operation complexity of workers are reduced.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a technology for distributing drive pulses of Insulated Gate Bipolar Transistors (IGBT) in a power module for a rail transit vehicle traction converter, and particularly relates to a pulse distribution method and a pulse distribution system for realizing compatibility of a topological structure of the power module.
Background
The existing power module for the rail transit vehicle is mostly driven by adopting a mode of 'pulse distributor + IGBT driver', and the existing pulse distribution rule is based on the driving mode, and the PWM pulse sent by a superior controller is subjected to logic processing and redistribution and then sent to the IGBT driver, so that the driving and the protection of the IGBT are realized.
The existing pulse distribution method only carries out pulse processing and drive control on a single topological structure of a power module, and sends a pulse sent by a superior controller to a corresponding IGBT after carrying out logic processing on the pulse through a pulse distributor. However, in the existing pulse distribution method, the determined topology structure of the power module cannot be changed, and the power modules with different topology structures cannot be compatible, and the power module for the rail transit vehicle often needs different topology structures such as a half-bridge parallel connection, a single-phase bridge, a three-phase bridge and the like, so that different types of power modules need to be provided. Since these power modules are not replaceable, the complexity of the operation and the maintenance cost of the personnel are high.
SUMMERY OF THE UTILITY MODEL
The application provides a pulse distribution system for realizing power module topological structure compatibility, which comprises: the device comprises a pulse distributor, at least one external short circuit module, at least four drivers respectively connected with the pulse distributor and at least four IGBTs respectively connected with the at least four drivers;
each two IGBTs are connected with each other to form a half bridge, and the half bridge at least comprises a first half bridge and a second half bridge; the external short circuit module is respectively connected with the first half bridge and the second half bridge and can be switched between a short circuit state and an open circuit state;
when the state of the external short circuit module is switched to short circuit, the first half bridge and the second half bridge form a half bridge two-parallel topology structure;
when the state of the external short-circuit module is switched to be open-circuit, the first half-bridge and the second half-bridge form a single-phase bridge topology structure.
In an embodiment, the system for implementing power module topology compatibility further includes:
and the external hard wire selection module is used for sending a mode switching signal to the pulse distributor and is connected with the pulse distributor.
In one embodiment, the pulse distributor comprises:
a parallel control module for receiving PWM pulses from a controller connected to the pulse distributor through a controller PWM pulse bus and distributing the PWM pulses to the first and second half-bridge control modules;
the first half-bridge control module is used for generating two driving pulses according to the received PWM pulses and respectively sending the two driving pulses to two drivers connected with the two IGBTs on the first half-bridge; and
the second half-bridge control module is used for generating two driving pulses according to the received PWM pulse and respectively sending the two driving pulses to two drivers connected with two IGBTs on a second half-bridge;
the first half-bridge control module and the second half-bridge control module are respectively connected with the parallel control module.
In one embodiment, the controller PWM pulse bus includes at least a first pulse channel and a second pulse channel.
In an embodiment, the system for implementing power module topology compatibility further includes: and the controller fault feedback bus is used for feeding back each IGBT fault signal to the controller and is connected with the parallel control module and the controller.
In one embodiment, the controller fault feedback bus includes at least a first fault signal path and a second fault signal path.
The pulse distribution system for realizing the compatibility of the power module topological structure can realize the compatibility of a half-bridge parallel topological structure and a full-bridge topological structure of the power module on the basis of the existing power module driving mode of 'a pulse distributor plus an IGBT driver', and can identify and report faults occurring to any IGBT in the topological structure to a controller. Based on the technical scheme of this application, can make two parallelly connected structures of power module half-bridge and single-phase bridge structure compatible, reduce the kind and the quantity of traditional scheme power module by a wide margin, be convenient for power module production and maintenance change reduce the operation complexity, reduce full life cycle cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pulse distribution system for realizing power module topology compatibility according to the present application;
FIG. 2A is a schematic diagram of the internal structure of the pulse distributor of the present application;
FIG. 2B is a schematic diagram of a controller PWM pulse bus according to the present application;
fig. 2C is a schematic diagram of a controller fault feedback bus of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a pulse distribution system (hereinafter referred to as pulse distribution system) for realizing power module topological structure compatibility, comprising: the device comprises a pulse distributor, at least one external short circuit module, at least four drivers respectively connected with the pulse distributor and at least four IGBTs respectively connected with the at least four drivers; each two IGBTs are connected with each other to form a half bridge, and the half bridge at least comprises a first half bridge and a second half bridge; the external short circuit module is respectively connected with the first half bridge and the second half bridge and can be switched between a short circuit state and an open circuit state; when the state of the external short circuit module is switched to short circuit, the first half bridge and the second half bridge form a half bridge two-parallel topology structure; when the state of the external short-circuit module is switched to be open-circuit, the first half-bridge and the second half-bridge form a single-phase bridge topology structure.
Referring to fig. 1, the pulse distribution system shown in fig. 1 includes a pulse distributor, a driver 1, a driver 2, a driver 3, and a driver 4 respectively connected to the pulse distributor, and four IGBTs respectively connected to the drivers, which are denoted as Q1, Q2, Q3, and Q4, respectively. As shown in fig. 1, Q1 is connected to Q2 to form a first half bridge, and Q3 is connected to Q4 to form a second half bridge. A connector O1 and a connector O2 are led out from the connection line between Q1 and Q2 and the connection line between Q3 and Q4, and are connected to the external short-circuit module.
Wherein, outside short circuit module can be the short circuit copper bar, also can be single-pole switch, or other circuit element that can realize short circuit connection, and this application does not prescribe a limit to this.
The external short-circuit module comprises a short-circuit state and an open-circuit state, and when the external short-circuit module is in the short-circuit state, the first half-bridge and the second half-bridge are connected with a joint O2 through a joint O1 to form a half-bridge two-parallel topological structure; when the external short circuit module is in an open circuit state, the first half bridge and the second half bridge are mutually independent to form a single-phase bridge topological structure.
When the pulse distribution system works, an external controller sends PWM pulses to the pulse distributor through a controller PWM pulse bus, after the pulse distributor receives the PWM pulses, the pulse distributor generates driving pulses according to the pulses and distributes the driving pulses to four drivers connected with the pulse distributor respectively, and then each driver transmits the driving pulses to corresponding IGBT to drive the IGBT to work. As shown in fig. 1, the pulse distributor transmits the generated upper tube Q1 driving pulse to the driver 1 to drive the upper tube Q1 of the first half bridge to operate; the pulse distributor transmits the generated lower tube Q2 driving pulse to the driver 2 so as to drive the lower tube Q2 of the first half bridge to work; the pulse distributor transmits the generated upper tube Q3 driving pulse to the driver 3 to drive the upper tube Q3 of the second half bridge to work; the pulse distributor transmits the generated lower tube Q4 driving pulse to the driver 4 to drive the lower tube Q4 of the second half bridge to operate.
In another embodiment, the pulse distribution system further comprises: and the external hard wire selection module is connected with the pulse distributor and is used for sending a mode switching signal to the pulse distributor.
As shown in fig. 1, the external hard wire selection module sends a mode switching signal to the pulse distributor through the external hard wire selection bus, where the mode switching signal is a signal for changing the operating mode of the pulse distribution system. The operation modes of the pulse distribution system comprise a parallel mode and a non-parallel mode. In the parallel mode, the first half bridge and the second half bridge form a half-bridge two-parallel topological structure; in the non-parallel mode, the first half-bridge and the second half-bridge form a single-phase bridge topology.
The pulse distributor receives a switching signal of an external hard wire selection module during the electrification of the board card and judges whether mode switching is needed or not. If the mode switching is needed, the pulse distributor controls the action of the external short circuit module to execute the mode switching. The method specifically comprises the following steps: the pulse distributor switches the state of the external short circuit module from open circuit to short circuit, and the pulse distribution system is switched to a parallel mode; or the pulse distributor switches the state of the external short circuit module from short circuit to open circuit, and the pulse distribution system is switched to a non-parallel mode.
For example, the external hard wire selection module can be provided with a selection button of a parallel mode and a non-parallel mode, when the parallel mode button is pressed, the external hard wire selection module sends a switching signal for switching to the parallel mode to the pulse distributor, the pulse distributor judges whether the current mode of the pulse distribution system is the parallel mode, and if so, the switching is not needed; if not, the external short circuit module is controlled to act to execute mode switching. In another example, the external hard-wire selection module may also be controlled by a controller. In another example, the hard line selection may be set by means of a jumper, if there is a jumper, the pulse distributor determines that the pulse distribution system enters the parallel mode, and if there is no jumper, the pulse distributor determines that the pulse distribution system enters the non-parallel mode.
In another embodiment, each IGBT also sends a feedback pulse to the pulse distributor via a driver connected thereto. For example, as shown in fig. 1, Q1 sends an upper tube Q1 feedback pulse to the pulse distributor through driver 1, Q2 sends a lower tube Q2 feedback pulse to the pulse distributor through driver 2; q3 sends an upper tube Q3 feedback pulse to the pulse distributor through driver 3, and Q4 sends a lower tube Q4 feedback pulse to the pulse distributor through driver 4. And the pulse distributor performs logic operation on the driving pulse for driving each IGBT and the feedback pulse of each IGBT to obtain a fault signal of each IGBT. Specifically, the pulse distributor performs logical operation on the upper tube Q1 driving pulse and the upper tube Q1 feedback pulse to obtain a fault signal of Q1, and if the logical operation value is a fault value and indicates that the Q1 has a fault, the fault signal of the Q1 is fed back to the controller connected to the pulse distributor through the controller fault feedback bus. The fault feedback process for the remaining IGBTs is similar to Q1 and will not be described here.
The technical scheme provided by the embodiment can make the two parallel structures of the half bridge of the power module and the single-phase bridge structure compatible, greatly reduce the types and the quantity of the power modules in the traditional scheme, facilitate the production, the maintenance and the replacement of the power modules, reduce the operation complexity and reduce the cost of the whole life cycle.
In another embodiment, the pulse distributor includes: the device comprises a parallel control module, a first half-bridge control module and a second half-bridge control module, wherein the first half-bridge control module and the second half-bridge control module are connected with the parallel control module.
The first half-bridge control module controls the IGBT on the first half-bridge through the driver, and the second half-bridge control module controls the IGBT on the second half-bridge through the driver. As shown in fig. 2A, the parallel control module receives PWM pulses from the controller through a controller PWM pulse bus, where the controller PWM pulse bus includes a first pulse channel and a second pulse channel, and according to the working mode of the pulse distribution system, the parallel control module generates a first half-bridge PWM pulse and a second half-bridge PWM pulse according to the PWM pulse of the first pulse channel and/or the PWM pulse of the second pulse channel, and distributes the first half-bridge PWM pulse and the second half-bridge PWM pulse to the first half-bridge control module and the second half-bridge control module, respectively.
Specifically, when the first half-bridge and the second half-bridge form a single-phase bridge topology structure, namely when the pulse distribution system is in a non-parallel mode, the parallel control module generates a first half-bridge PWM pulse according to the PWM pulse of the first pulse channel and distributes the first half-bridge PWM pulse to the first half-bridge control module; the parallel control module generates a second half-bridge PWM pulse according to the PWM pulse of the second pulse channel and distributes the second half-bridge PWM pulse to the second half-bridge control module.
When the first half-bridge and the second half-bridge form a parallel topology structure, namely when the pulse distribution system is in a parallel mode, the parallel control module generates a first half-bridge PWM pulse and a second half-bridge PWM pulse according to the PWM pulse of the first pulse channel, and the first half-bridge PWM pulse and the second half-bridge PWM pulse are distributed to the first half-bridge control module and the second half-bridge control module respectively. Thereby achieving signal synchronization of the first half-bridge PWM pulse and the second half-bridge PWM pulse.
The manner of controlling the IGBTs by the first half-bridge control module and the second half-bridge control module is similar to the manner of controlling the IGBTs by the pulse distributor in the foregoing embodiment, and details are not repeated here.
In another embodiment, as shown in fig. 2A, 2B and 2C, the first half-bridge control module receives feedback pulses of the IGBTs on the first half-bridge, i.e., an upper tube Q1 feedback pulse and a lower tube Q2 feedback pulse; the second half-bridge control module receives feedback pulses of the IGBTs on the second half-bridge, i.e., an upper tube Q3 feedback pulse and a lower tube Q4 feedback pulse.
The first half-bridge control module performs logical operation on the upper tube Q1 driving pulse and the upper tube Q1 feedback pulse to obtain an upper tube Q1 fault signal; the first half-bridge control module performs logical operation on a lower tube Q2 driving pulse and a lower tube Q2 feedback pulse to obtain a lower tube Q2 fault signal; the second half-bridge control module performs logical operation on the upper tube Q3 driving pulse and the upper tube Q3 feedback pulse to obtain an upper tube Q3 fault signal; and the second half-bridge control module performs logical operation on the driving pulse of the lower tube Q4 and the feedback pulse of the lower tube Q4 to obtain a fault signal of the lower tube Q4. When the logic operation result is a fault value, a corresponding fault signal needs to be fed back to the parallel control module. The parallel module transmits a fault signal to a controller connected with the parallel control module through a controller fault feedback bus according to the working mode of the pulse distribution system, wherein the controller fault feedback bus at least comprises a first fault signal channel and a second fault signal channel.
Specifically, when a first half-bridge and a second half-bridge form a single-phase bridge topology, namely when the pulse distribution system is in a non-parallel mode, the parallel control module feeds back a fault signal on the first half-bridge, namely an upper tube Q1 fault signal and/or a lower tube Q2 fault signal to the controller through the first fault signal channel; and feeding back a fault signal on the second half bridge, i.e., an upper tube Q3 fault signal and/or a lower tube Q4 fault signal, to the controller through the second fault signal path.
When the first half-bridge and the second half-bridge form a half-bridge parallel topology, i.e. when the pulse distribution system is in parallel mode, the parallel control module is further configured to: feeding back a fault signal of the first half bridge, namely an upper tube Q1 fault signal and/or a lower tube Q2 fault signal, to the controller through the first fault signal path; and feeding back a fault signal of the second half bridge, namely an upper tube Q3 fault signal and/or a lower tube Q4 fault signal, to the controller through the first fault signal path.
For example, when the parallel topology is practically applied, for one half-bridge parallel module, the controller PWM pulse bus and the controller fault feedback bus each have only one channel to complete the transmission and feedback of signals, and the scheme provided in this embodiment is that the transmission of parallel signals and the feedback of any IGBT fault signal can be completed through the first pulse channel and the first fault channel.
The pulse distribution system for realizing the compatibility of the power module topological structure provided by the embodiment can realize the identification of the fault of any IGBT in the topological structure and report the fault to the controller, thereby being convenient for monitoring whether each IGBT normally operates and quickly finding out the faulty IGBT in real time, improving the maintenance efficiency and reducing the operation complexity.
In another embodiment, the number of the IGBTs is 6, and the pulse distribution system includes a first half-bridge, a second half-bridge and a third half-bridge, each IGBT is connected with a driver, and each half-bridge structure is correspondingly provided with a half-bridge control module. When a parallel mode needs to be entered, any two half bridges can be selected to be connected to form a half-bridge two-parallel topological structure; when the pulse distribution system is in a non-parallel mode, the output end can be adjusted, so that the pulse distribution system forms a single-phase bridge topology structure or a three-phase bridge topology structure.
In practical application, the number and the structure of the IGBTs can be adjusted according to needs, compatibility of various topological structures is achieved, and the number of the IGBTs is not specifically limited in the application.
According to the embodiment, the quantity and the structure of the IGBTs are reasonably adjusted, the pulse distribution system can be controlled to be compatible with various topological structures such as half-bridge parallel connection, single-phase bridges and three-phase bridges, the types and the quantity of power modules in the traditional scheme are greatly reduced, the power modules are convenient to produce, maintain and replace, the operation complexity is reduced, and the full life cycle cost is reduced.
To sum up, the pulse distribution system that realizes that power module topological structure is compatible that this application provided can realize the nimble switching of the parallelly connected topological structure of power module half-bridge and full-bridge topological structure on the power module drive mode basis of current "pulse distributor + IGBT driver" to and the trouble that arbitrary IGBT in the discernment topological structure takes place reports for the controller, reduces staff's operation complexity by a wide margin, the power module production of being convenient for and maintenance change.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the specification.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the present specification.
Claims (6)
1. A pulse distribution system for implementing power module topology compatibility, comprising: the device comprises a pulse distributor, at least one external short circuit module, at least four drivers respectively connected with the pulse distributor and at least four IGBTs respectively connected with the at least four drivers;
each two IGBTs are connected with each other to form a half bridge, and the half bridge at least comprises a first half bridge and a second half bridge; the external short circuit module is respectively connected with the first half bridge and the second half bridge and can be switched between a short circuit state and an open circuit state;
when the state of the external short circuit module is switched to short circuit, the first half bridge and the second half bridge form a half bridge two-parallel topology structure;
when the state of the external short-circuit module is switched to be open-circuit, the first half-bridge and the second half-bridge form a single-phase bridge topology structure.
2. The system according to claim 1, further comprising: and the external hard wire selection module is used for sending a mode switching signal to the pulse distributor and is connected with the pulse distributor.
3. The system of claim 2, wherein the pulse distributor comprises:
a parallel control module for receiving PWM pulses from a controller connected to the pulse distributor through a controller PWM pulse bus and distributing the PWM pulses to the first and second half-bridge control modules;
the first half-bridge control module is used for generating two driving pulses according to the received PWM pulses and respectively sending the two driving pulses to two drivers connected with the two IGBTs on the first half-bridge; and
the second half-bridge control module is used for generating two driving pulses according to the received PWM pulse and respectively sending the two driving pulses to two drivers connected with two IGBTs on a second half-bridge;
the first half-bridge control module and the second half-bridge control module are respectively connected with the parallel control module.
4. The system of claim 3, wherein the controller PWM pulse bus comprises at least a first pulse channel and a second pulse channel.
5. The system according to any of claims 3 to 4, further comprising:
and the controller fault feedback bus is used for feeding back each IGBT fault signal to the controller and is connected with the parallel control module and the controller.
6. The system of claim 5, wherein the controller fault feedback bus comprises at least a first fault signal path and a second fault signal path.
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