Driving circuit wiring structure of parallel IGBT (Insulated Gate Bipolar Translator) in bootstrap driving mode

Abstract

The utility model relates to the technical field of IGBT (Insulated Gate Bipolar Translator) driving circuits, in particular to a driving circuit wiring structure of parallel IGBTs in a bootstrap driving mode. The driving circuit wiring structure of the parallel IGBTs in the bootstrap driving mode comprises a PCB, a driving optocoupler, a first IGBT device, a first on-off control module, a second IGBT device, a second on-off control module and a bootstrap capacitor, wherein the driving optocoupler, the first IGBT device, the first on-off control module, the second IGBT device and the bootstrap capacitor are arranged on the PCB. The first IGBT device and the second IGBT device are arranged on the two sides of the driving optocoupler respectively, the first on-off control module and the second on-off control module are arranged on the two sides of the driving optocoupler respectively, the first IGBT device and the first on-off control module are located on the same side of the driving optocoupler, and the second IGBT device and the second on-off control module are located on the same side of the driving optocoupler. Through the above layout structure, the length of the driving loop of the first IGBT device and the length of the driving loop of the second IGBT device can be substantially the same or similar, thereby effectively improving the response consistency of the driving loop of the first IGBT device and the driving loop of the second IGBT device.

Description

Technical Field

[0001] The present application relates to the technical field of IGBT drive circuits, and in particular to a drive circuit wiring structure of parallel IGBTs in a bootstrap drive mode. Background Art

[0002] Currently, two IGBTs (insulated gate bipolar transistors) are used in parallel to replace one IGBT in electronic circuits. This design has the following advantages:

[0003] 1. Connecting multiple IGBTs in parallel can increase the power carrying capacity of the inverter, enabling it to handle higher loads;

[0004] 2. Connecting multiple IGBTs in parallel can improve the reliability of the system. If one IGBT fails, the other IGBTs can still work normally, thus reducing the downtime of the system;

[0005] 3. By using multiple IGBTs and sharing the input power in parallel, the load of a single IGBT can be reduced, the operating temperature of each IGBT can be lowered, and its life can be extended;

[0006] Since each IGBT requires a driving circuit to ensure the normal operation of the IGBT module, the driving circuit can also protect the IGBT.

[0007] In an IGBT driving circuit, a bootstrap capacitor is usually used to drive the IGBT. Therefore, when wiring the PBC, the relative positions of the two IGBT driving circuits and the bootstrap capacitor need to be considered to ensure the normal operation of the two IGBT driving circuits.

[0008] However, the common driving circuits of parallel IGBTs in the bootstrap driving mode currently have the problem of poor consistency between the two IGBT driving circuits. Utility Model Content

[0009] The present application provides a driving circuit wiring structure of parallel IGBTs in a bootstrap driving mode to solve the problem of poor corresponding consistency of two IGBT driving circuits. The following technical solutions are adopted:

[0010] A driving circuit wiring structure of parallel IGBTs in a bootstrap driving mode, comprising a PCB board, a driving optical coupler arranged on the PCB board, a first IGBT device, a first on-off control module, a second IGBT device, a second on-off control module, and a bootstrap capacitor;

[0011] The bootstrap capacitor is arranged on one side of the driving optocoupler; the first IGBT device and the second IGBT device are respectively arranged on both sides of the driving optocoupler, the first on-off control module and the second on-off control module are respectively arranged on both sides of the driving optocoupler, and the first IGBT device and the first on-off control module are located on the same side of the driving optocoupler, and the second IGBT device and the second on-off control module are located on the same side of the driving optocoupler.

[0012] By adopting the above technical solution and the above layout structure, the first IGBT device and the second IGBT device can be symmetrically distributed on both sides of the driving optocoupler, and the first on-off control module and the second on-off control module can be symmetrically distributed on both sides of the driving optocoupler. Therefore, the lengths of the driving circuit of the first IGBT device and the driving circuit of the second IGBT device can be roughly the same or similar, thereby effectively improving the consistency of the response of the driving circuit of the first IGBT device and the driving circuit of the second IGBT device.

[0013] Preferably, the driving optical coupler and the bootstrap capacitor are both arranged on a side of the first on-off control module facing away from the first IGBT device or on a side of the second on-off control module facing away from the second IGBT device.

[0014] By adopting the above technical solution, when wiring on the PCB board, the driving circuit of the first IGBT device can be wired in the order of driving optocoupler-bootstrap capacitor-first on-off control module-first IGBT device, and at the same time, the driving circuit of the second IGBT device can be wired in the order of driving optocoupler-bootstrap capacitor-second on-off control module-second IGBT device, which can make the wiring work faster.

[0015] Preferably, the PCB board is provided with a central area and a peripheral area surrounding the central area, and the driving optocoupler, the first IGBT device, the first on-off control module, the second IGBT device, the second on-off control module, and the bootstrap capacitor are all arranged in the peripheral area.

[0016] By adopting the above technical solution and setting the central area and the peripheral area, the wiring design work on the PCB board is more convenient, and it is convenient to set the driving circuit of the first IGBT device and the driving circuit of the second IGBT device in a C shape, so that the driving circuit of the first IGBT device and the driving circuit of the second IGBT device are basically the same length, thereby improving the consistency of the response of the first IGBT device and the second IGBT device.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects:

[0018] 1. By adopting a symmetrical layout of the driving circuit of the first IGBT device and the driving circuit of the second IGBT device with the driving optocoupler as the center, the driving circuit of the first IGBT device and the driving circuit of the second IGBT device are substantially equal in length, thereby improving the response consistency of the driving circuit of the first IGBT device and the driving circuit of the second IGBT device;

[0019] 2. By setting the central area and the peripheral area, the wiring design work on the PCB board is more convenient, and it is convenient to set the driving circuit of the first IGBT device and the driving circuit of the second IGBT device in a C shape, so that the driving circuit of the first IGBT device and the driving circuit of the second IGBT device are basically the same length, thereby improving the consistency of the response of the first IGBT device and the second IGBT device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a circuit schematic diagram of an upper bridge arm IGBT driving circuit of an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the wiring structure of the driving circuit of the parallel IGBT in the currently common bootstrap driving mode;

[0022] Figure 3 It is a schematic diagram of the wiring structure of the driving circuit of the parallel IGBT in the improved bootstrap driving mode according to the embodiment of the present application.

[0023] Markings in the attached figure: 1, PCB board; 11, central area; 12, peripheral area; 2, driving optocoupler; 3, bootstrap capacitor; 4, first IGBT device; 5, first on-off control module; 6, second IGBT device; 7, second on-off control module. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-3 The utility model is described in further detail.

[0025] The present application embodiment discloses a driving circuit wiring structure of parallel IGBTs in a bootstrap driving manner. Figure 1 In the upper bridge arm IGBT driving circuit shown in the figure, the upper bridge arm IGBT and the lower bridge arm IGBT are complementary turned on. When the upper bridge arm IGBT is turned off and the lower bridge arm is turned on, 15V charges the bootstrap capacitor C5. When the lower bridge arm is turned off and the upper bridge arm is turned on, the bootstrap capacitor C5 discharges to provide driving voltage to the upper bridge arm IGBT.

[0026] The specific circuit layout structure of the upper bridge arm IGBT drive circuit, that is, the drive circuit wiring structure of the parallel IGBT in the bootstrap drive mode, is as follows: Figure 2As shown, it includes a PCB board 1 and a driving optical coupler 2, a bootstrap capacitor 3, a first IGBT device 4, a first on-off control module 5, a second IGBT device 6, and a second on-off control module 7 arranged on the PCB board 1. The bootstrap capacitor 3 is located on the lateral side of the driving optical coupler 2, the first IGBT device 4 and the first on-off control module 5 are located on the vertical side of the processing chip, and the second IGBT device 6 and the second on-off control module 7 are located on the side of the driving optical coupler 2 facing away from the bootstrap capacitor 3. This circuit wiring structure has the advantages of high space utilization rate of the PCB board 1 and high device density, which helps to reduce production costs.

[0027] However, this wiring method will have the following problems: since the distance between the first IGBT device 4 and the bootstrap capacitor 3 is smaller than the distance between the second IGBT device 6 and the bootstrap capacitor 3, the driving circuit of the first IGBT device 4 will be smaller and the driving circuit of the second IGBT device 6 will be larger, resulting in inconsistent impedances of the two driving circuits, and further causing inconsistent responses of the first IGBT device 4 and the second IGBT device 6.

[0028] Therefore, in order to solve the above problem, the embodiment of the present application adopts a symmetrical layout of the first IGBT device 4 driving circuit and the second IGBT device 6 driving circuit.

[0029] Reference Figure 3 The driving optical coupler 2 is arranged at the middle of the PCB board 1, and the first IGBT device 4

[0030] The invention comprises a PCB board 1 and a driving optical coupler 2, a first IGBT device 4, a first on-off control module 5, a second IGBT device 6, a second on-off control module 7 and a bootstrap capacitor 3 arranged on the PCB board 1.

[0031] In the embodiment of the present application, a central area 11 and a peripheral area 12 surrounding the central area 11 are provided on the PCB board 1, and the driving optocoupler 2, the first IGBT device 4, the first on-off control module 5, the second IGBT device 6, the second on-off control module 7, and the bootstrap capacitor 3 are all arranged in the peripheral area 12.

[0032] Specifically, the driving optocoupler 2 is located on the upper side of the central area 11, and the bootstrap capacitor 3 is arranged on a lateral side of the driving optocoupler 2. The first IGBT device 4 and the second IGBT device 6 are respectively arranged on the lateral sides of the central area 11, the first on-off control module 5 and the second on-off control module 7 are respectively arranged on the lateral sides of the central area 11, and the first IGBT device 4 and the first on-off control module 5 are located on the same side of the central area 11, and the second IGBT device 6 and the second on-off control module 7 are located on the same side of the central area 11.

[0033] Through the above layout structure, the first IGBT device 4 and the second IGBT device 6 can be symmetrically distributed on both sides of the driving optocoupler 2, and the first on-off control module 5 and the second on-off control module 7 can be symmetrically distributed on both sides of the driving optocoupler 2. Therefore, the lengths of the driving circuit of the first IGBT device 4 and the driving circuit of the second IGBT device 6 can be roughly the same or similar, thereby effectively improving the consistency of the response of the driving circuit of the first IGBT device 4 and the driving circuit of the second IGBT device 6.

[0034] The implementation principle of the driving circuit wiring structure of the parallel IGBT in the bootstrap driving mode in the embodiment of the present application is: by adopting a symmetrical layout of the driving circuit of the first IGBT device 4 and the driving circuit of the second IGBT device 6 with the driving optocoupler 2 as the center, the driving circuit of the first IGBT device 4 and the driving circuit of the second IGBT device 6 are made to be substantially equal in length, thereby improving the response consistency of the driving circuit of the first IGBT device 4 and the driving circuit of the second IGBT device 6.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A drive circuit wiring structure of parallel IGBTs in a bootstrap drive mode, Features: It includes a PCB board and a driving optical coupler, a first IGBT device, a first on-off control module, a second IGBT device, a second on-off control module, and a bootstrap capacitor arranged on the PCB board; The bootstrap capacitor is arranged on one side of the driving optocoupler; the first IGBT device and the second IGBT device are respectively arranged on both sides of the driving optocoupler, the first on-off control module and the second on-off control module are respectively arranged on both sides of the driving optocoupler, and the first IGBT device and the first on-off control module are located on the same side of the driving optocoupler, and the second IGBT device and the second on-off control module are located on the same side of the driving optocoupler.

2. The drive circuit wiring structure of the parallel IGBT of the bootstrap drive method according to claim 1, Features: The driving optical coupler and the bootstrap capacitor are both arranged on a side of the first on-off control module facing away from the first IGBT device or on a side of the second on-off control module facing away from the second IGBT device.

3. The drive circuit wiring structure of the parallel IGBT of the bootstrap drive method according to claim 1, Features: The PCB board is provided with a central area and a peripheral area surrounding the central area, and the driving optical coupler, the first IGBT device, the first on-off control module, the second IGBT device, the second on-off control module, and the bootstrap capacitor are all arranged in the peripheral area.

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