Drive device

Abstract

A drive device (101) is provided with: a substrate (1); a converter (6) mounted on the substrate (1); an inverter (7) mounted on the substrate (1); a P-side bus bar (12), which is a positive-side bus bar and which connects an output P-side terminal (8), which is a positive-side terminal of the converter (6), and an input P-side terminal (10), which is a positive-side terminal of the inverter (7); and an N-side bus bar (13), which is a negative-side bus bar, that connects an output N-side terminal (9), which is a negative-side terminal of the converter (6), and an input N-side terminal (11), which is a negative-side terminal of the inverter (7). The P-side bus bar (12) and the N-side bus bar (13) are each covered with an insulating material. The P-side bus bar (12) and the N-side bus bar (13) are arranged in parallel on the substrate (1).

Description

Technical Field

[0001] The present disclosure relates to a drive device including a converter and an inverter. Background Art

[0002] In main circuit boards equipped with converters and inverters, the routing of the negative-side pattern of the power module is crucial for reducing noise and preventing malfunctions. However, due to the pinout of the power module, the routing length increases, making performance improvements problematic. For example, Patent Document 1 discloses a technique in which the positive-side terminal of the converter is connected to the positive-side terminal of the inverter via a conductor bar, and the negative-side terminal of the converter is connected to the negative-side terminal of the inverter via another conductor bar. These conductor bars extend through an iron core to counteract noise.

[0003] Patent Document 1: International Publication No. 2015 / 056286

[0004] Conventional technology does not have a structure in which conductor bars are arranged on a substrate. It is desired to provide a drive device that can reduce noise superimposed on wiring and prevent circuit malfunction when a converter and an inverter are mounted on a substrate to form a single power module. Summary of the Invention

[0005] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a drive device that can reduce noise superimposed on wiring and prevent malfunction of the circuit when a converter and an inverter are mounted on a substrate to constitute a single power module.

[0006] To address the aforementioned issues and achieve the objectives, the drive device disclosed herein comprises: a substrate; a converter mounted on the substrate; an inverter mounted on the substrate; a positive busbar connecting the positive terminal of the converter to the positive terminal of the inverter; and a negative busbar connecting the negative terminal of the converter to the negative terminal of the inverter. The positive and negative busbars are each coated with an insulating material. The positive and negative busbars are arranged parallel to each other on the substrate.

[0007] The drive device of the present disclosure can achieve the effect of reducing noise superimposed on wiring and preventing malfunction of the circuit when the converter and the inverter are mounted on a substrate to constitute a single power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a diagram schematically showing the configuration of the drive device according to the first embodiment.

[0009] Figure 2 This is a schematic diagram showing the installation positions of the power modules, P-side bus bars, and N-side bus bars included in the drive device according to the first embodiment.

[0010] Figure 3 This is a diagram schematically showing the configuration of a drive device according to a second embodiment.

[0011] Figure 4 This is a schematic diagram showing the installation positions of a power module, a P-side bus bar, an N-side bus bar, and an AC reactor included in the drive device according to the second embodiment. DETAILED DESCRIPTION

[0012] Hereinafter, the driving device according to the embodiment will be described in detail with reference to the drawings.

[0013] Implementation method 1.

[0014] Figure 1 This diagram schematically illustrates the configuration of a drive device 101 according to Embodiment 1. Drive device 101 includes a substrate 1, a capacitor 4 mounted on substrate 1, and a power module 5 mounted on substrate 1. Power module 5 includes a converter 6 and an inverter 7. Output P-side terminal 8, which serves as the positive output terminal of converter 6, is connected to input P-side terminal 10, which serves as the positive input terminal of inverter 7. Output N-side terminal 9, which serves as the negative output terminal of converter 6, is connected to input N-side terminal 11, which serves as the negative input terminal of inverter 7. P-side refers to the positive side, and N-side refers to the negative side. The positive side is the positive side, and the negative side is the negative side.

[0015] exist Figure 1 2. A three-phase AC power supply 2 is also shown. A first input terminal 14, a second input terminal 15, and a third input terminal 16 of a converter 6 are connected to the three-phase AC power supply 2. The three-phase AC voltage input from the three-phase AC power supply 2 to the converter 6 is converted into a DC voltage by the converter 6. The DC voltage obtained by the converter 6 is then smoothed by the capacitor 4.

[0016] The inverter 7 converts the DC voltage obtained by the converter 6 into an AC voltage of a desired frequency. Figure 1 The motor 3 is also shown in FIG. The AC voltage obtained by the inverter 7 is supplied to the motor 3 via the first output terminal 17 , the second output terminal 18 , and the third output terminal 19 .

[0017] like Figure 1As shown, the output P-side terminal 8 of the converter 6 and the input P-side terminal 10 of the inverter 7, as well as the output N-side terminal 9 of the converter 6 and the input N-side terminal 11 of the inverter 7, included in the power module 5, are separated by pin assignment. The output P-side terminal 8 of the converter 6 and the input P-side terminal 10 of the inverter 7 are connected via a P-side bus bar 12, while the output N-side terminal 9 of the converter 6 and the input N-side terminal 11 of the inverter 7 are connected via an N-side bus bar 13. Specifically, the drive device 101 further includes a P-side bus bar 12, which connects the output P-side terminal 8 of the converter 6, which is the positive terminal, to the input P-side terminal 10, which is the positive terminal of the inverter 7; and an N-side bus bar 13, which connects the output N-side terminal 9 of the converter 6, which is the negative terminal, to the input N-side terminal 11, which is the negative terminal of the inverter 7.

[0018] P-side busbar 12 and N-side busbar 13 are each covered with an insulating material. P-side busbar 12 and N-side busbar 13 are arranged parallel to each other on substrate 1. Drive device 101 further includes an iron core 21. Parts of each of P-side busbar 12 and N-side busbar 13 extend through a through-hole in the center of iron core 21. P-side busbar 12, N-side busbar 13, and iron core 21 constitute a common mode choke coil.

[0019] Figure 2 Schematic diagram showing the installation positions of the power module 5, the P-side bus bar 12, and the N-side bus bar 13 of the drive device 101 according to the first embodiment. Figure 2 Lieutenant General's top view and main view Figure 1 The P-side bus bar 12 and the N-side bus bar 13 are arranged above the power module 5. In other words, a portion of each of the P-side bus bar 12 and the N-side bus bar 13 is located above the power module 5 without contacting the power module 5.

[0020] The P-side busbar 12 and the N-side busbar 13 minimize the distance of the wiring connecting the output P-side terminal 8 and the input P-side terminal 10, as well as the distance of the wiring connecting the output N-side terminal 9 and the input N-side terminal 11. Furthermore, since the P-side busbar 12 and the N-side busbar 13 are arranged above the power module 5, portions of each of the P-side busbar 12 and the N-side busbar 13 are located above the power module 5 and do not contact the power module 5. This eliminates the need for copper foil patterns that would otherwise be routed around the power module 5 for wiring, thus reducing the pattern area of the substrate 1. As a result, the drive device 101 can reduce the size of the substrate 1. The reduced wiring impedance improves noise immunity, thereby suppressing circuit malfunctions. Furthermore, since portions of each of the P-side busbar 12 and the N-side busbar 13 extend through the through-hole in the center of the iron core 21, the drive device 101 can further improve noise immunity. That is, in the drive device 101 , when the converter 6 and the inverter 7 are mounted on the substrate 1 to constitute a single power module 5 , noise superimposed on wiring can be reduced and malfunction of the circuit can be prevented.

[0021] Implementation method 2.

[0022] Figure 3 This diagram schematically illustrates the configuration of a drive device 102 according to Embodiment 2. The configuration of drive device 102 is similar to that of drive device 101 according to Embodiment 1. Therefore, the differences between Embodiment 2 and Embodiment 1 will be primarily described. Similar to drive device 101, drive device 102 converts a three-phase AC voltage input from a three-phase AC power source 2 to a DC voltage via converter 6, and then converts the DC voltage obtained by converter 6 into an AC voltage of a desired frequency via inverter 7, thereby driving motor 3.

[0023] In drive device 101 according to Embodiment 1, P-side busbar 12 and N-side busbar 13 are arranged in parallel, and portions of each pass through a through-hole in the center of iron core 21, thereby improving noise immunity. In contrast, in Embodiment 2, drive device 102 includes an AC reactor 23 arranged on a portion of P-side busbar 12. The output P-side terminal 8 of converter 6 and the input P-side terminal 10 of inverter 7 are connected via AC reactor 23. As in Embodiment 1, N-side busbar 13 is arranged on substrate 1. Drive device 102 includes an iron core 22 in place of iron core 21 in Embodiment 1. While no portion of P-side busbar 12 passes through the through-hole in iron core 22, a portion of N-side busbar 13 does pass through the through-hole in the center of iron core 22, thereby improving noise immunity in drive device 102.

[0024] Figure 4 Schematic diagram showing the installation positions of the power module 5, the P-side bus bar 12, the N-side bus bar 13, and the AC reactor 23 included in the drive device 102 of the second embodiment. In order to more appropriately explain the installation positions of the P-side bus bar 12, the N-side bus bar 13, and the AC reactor 23 relative to the power module 5, Figure 4 Lieutenant General's top view and main view Figure 1 The AC reactor 23 is arranged outside the substrate 1 .

[0025] The above-described configuration minimizes the wiring distance connecting the output N-side terminal 9 and the input N-side terminal 11. Furthermore, since the N-side bus bar 13 is located above the power module 5, there is no need to route the wiring through the substrate 1 in a pattern that would bypass the power module 5, thereby reducing the pattern area of the substrate 1. As a result, the drive device 102 can reduce the size of the substrate 1. Furthermore, due to the reduced wiring impedance, noise immunity can be improved, thereby preventing circuit malfunctions.

[0026] The configurations shown in the above embodiments are merely examples and can be combined with other known technologies. The embodiments can be combined with each other. Part of the configuration can be omitted or modified without departing from the spirit of the invention.

[0027] Description of Reference Numerals

[0028] 1...substrate; 2...three-phase AC power supply; 3...motor; 4...capacitor; 5...power module; 6...converter; 7...inverter; 8...output P-side terminal; 9...output N-side terminal; 10...input P-side terminal; 11...input N-side terminal; 12...P-side busbar; 13...N-side busbar; 14...first input terminal; 15...second input terminal; 16...third input terminal; 17...first output terminal; 18...second output terminal; 19...third output terminal; 21, 22...iron core; 23...AC reactor; 101, 102...drive device.

Claims

1. A driving device, characterized in that: have: substrate; a converter mounted on the substrate; an inverter mounted on the substrate; a positive-side bus bar connecting a positive-side terminal of the converter and a positive-side terminal of the inverter; and a negative bus bar connecting the negative terminal of the converter and the negative terminal of the inverter, The positive side bus bar and the negative side bus bar are respectively covered with insulating materials. The positive bus bar and the negative bus bar are arranged in parallel on the substrate.

2. The driving device according to claim 1, characterized in that It also has an iron core. Parts of the positive bus bar and the negative bus bar pass through the through hole in the center of the iron core. The positive-side bus bar, the negative-side bus bar, and the iron core constitute a common mode choke coil.

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