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AN_1906_PL18_1908_180413

Scalable power inverter driving an electric

motor

Using the low voltage drives scalable power demonstration board

About this document

Scope and purpose

The low voltage drives scalable power demonstration board is a scalable platform for high power motor drive

applications. It has been developed to provide a flexible test environment for initial designs and technology

comparison. This document provides a detailed description of the platform modules, so the user will be able to

adapt the boards according to specific system requirements, and investigate and compare the capabilities of

power MOSFETs.

Intended audience

This document is intended for engineers using the "Low voltage drives scalable power demonstration board"

evaluation platform, or those evaluating the platforms suitability for use.

Table of contents

About this document ....................................................................................................................... 1

Table of contents ............................................................................................................................ 1

Introduction .......................................................................................................................... 3

Board overview ...................................................................................................................... 4

2.1

Power boards .......................................................................................................................................... 5

2.2

Master Mother Board and Mother Boards ............................................................................................ 10

2.2.1

Gate drivers option I – 2EDL23N06PJ .............................................................................................. 13

2.2.2

Gate drivers option II – 1EDN8550B ................................................................................................. 14

2.2.2.1

Functional principle of the 1EDN8550B (TDI) gate driver .......................................................... 15

2.2.2.2

Performance results with KIT_LGMB_BOM004 & KIT_LGMB_BOM504 ..................................... 16

2.3

Daughter boards.................................................................................................................................... 21

2.4

Functional principle of the 1EDN8550B (TDI) gate driver Capacitor boards....................................... 22

2.5

Control board ........................................................................................................................................ 24

Three phase motor drive setup (B6)......................................................................................... 25

3.1

Supply voltage ....................................................................................................................................... 26

3.2

Board interconnections in multiphase setups and power board paralleling ..................................... 26

3.2.1

Control signals – control board interface........................................................................................ 27

3.2.2

Mother board bus ............................................................................................................................. 28

3.2.3

Daughter board bus ......................................................................................................................... 29

3.3

Using the V/f control for induction motor ............................................................................................ 29

3.3.1

Using the GUI .................................................................................................................................... 32

3.3.2

Driving an induction motor.............................................................................................................. 34

Performance of a B6 setup in a motor drive application ............................................................. 36

4.1

No paralleling ........................................................................................................................................ 37

4.1.1

Operating point 1 ............................................................................................................................. 38

4.1.2

Operating point 2 ............................................................................................................................. 40

4.2

Two per phase parallel connection ...................................................................................................... 42

Application Note

www.infineon.com

Please read the Important Notice and Warnings at the end of this document

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Scalable power inverter driving an electric motor

Using the low voltage drives scalable power demonstration board

Introduction

4.2.1

4.2.2

4.3

4.3.1

Operating point 3 ............................................................................................................................. 43

Operating point 4 ............................................................................................................................. 46

Four per phase parallel connection...................................................................................................... 48

Operating point 5 ............................................................................................................................. 49

Summary ............................................................................................................................. 51

Reference ............................................................................................................................. 52

Revision history............................................................................................................................. 53

Application Note

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Scalable power inverter driving an electric motor

Using the low voltage drives scalable power demonstration board

Introduction

The low voltage drives scalable power demonstration board offers the possibility of building a three-phase

motor drive setup of various power capabilities due to its MOSFET paralleling flexibility. The setup shown in

Figure 1 is an example of a three-phase inverter (also known as a B6 topology) for motor drive. The detailed

procedure of building such a setup is described in the “Low voltage drives scalable power demonstration board

user manual” [1].

The example is implemented with four MOSFETs connected in parallel in place of each B6 switch. The platform

was designed to be able to adapt the amount of MOSFET paralleling to the system requirements, by simply

adding or removing the power half-bridge modules. All components typically used for trimming performance

are located on FR4-based modules, while the power modules are implemented in IMS PCB technology adapted

to improve heat transfer using additional heatsinks – air-cooled or water-cooled.

This application note describes the details of the individual modules, their interconnection, and a graphical

user interface (GUI) complementing the supporting firmware. The aim is to provide the user with sufficient

knowledge to be able to utilize the modules in a working setup, and adapt the circuits to their own

requirements.

The examples provide a performance overview of the three-phase setup.

Figure 1

Typical setup for three-phase motor drive

Application Note

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Scalable power inverter driving an electric motor

Using the low voltage drives scalable power demonstration board

Board overview

The modular platform consists of different boards (modules) that can be used to design a fully functional

assembly, where each board has a specific role in a given setup. The modularity offers a wide range of possible

topologies. The concept supports half-bridge, full-bridge or three-phase topologies.

The basic principle of board functionality is illustrated in the block diagram in Figure 2.

Figure 2

Modular design – basic principles

By role (or functionality) in the setup, the modules are divided into five categories:



Power board:

MOSFET half-bridge configuration



Mother board and master mother board:

gate driver board – connects to the first paralleled power board



Daughter board:

interconnection between the gate driver and the paralleled power boards



Capacitor board:

PCB accommodating up to 12 capacitors connected to the DC bus



Control board:

drive card XMC4400 demonstration board

Figure 2 shows a single-power half-bridge (power board), driven by the gate drivers (master mother board)

controlled by the XMC

drive card (control board). Any setup is controlled by a control board (e.g. XMC

drive

card – XMC4400) connected to the master mother board via the X3 connector.

The setup can be expanded to a multiphase setup using additional mother boards connected at the mother

board bus(MB bus) via a ribbon cable.

Each phase can be expanded with several power boards connected in parallel.

Application Note

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Scalable power inverter driving an electric motor

Using the low voltage drives scalable power demonstration board

Board overview

Figure 3

Single-phase assembly with paralleled power boards (exploded view)

Figure 3 shows an example of a single-phase (“U”) assembly with four power boards connected in parallel,

interconnected to the corresponding master mother board and three daughter boards.

2.1

Power boards

The power boards are the main building blocks of the three-phase assembly. They are IMS PCB-based half-

bridge sub-assemblies, comprising a single high-side (HS) and a single low-side (LS) MOSFET with all the

necessary connectors for power and signal lines.

Figure 4 shows the different versions of the power boards available.

Application Note

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