Andreas Kiep

Optimal PWM method for electric and electro-hydraulic power steering applications

This paper presents a methodology for choosing the optimal PWM method for the 3-phase automotive drives applications for electric and electro-hydraulic power steering. It shows how some of the automotive specific requirements transpose to PWM requirements. A system overview with motor and control principles has been presented, followed by the method of power loss calculations based on datasheet parameters and, after that, an overview of the PWM Methods is given. These Methods are compared based on: power loss minimisation, usage of the battery voltage, quality of output current and noise emission minimisation.

Power stage for permanent magnet synchronous motors in high current automotive applications

This paper focuses on the Driver-IC and the MOSFETs in inverter used in automotive applications to control a permanent magnet AC-motor with the focus on high current handling capability and high reliability for safety critical applications. The features of the Driver IC together with latest MOSFET technologies will be discussed.

Semiconductor for xEV: Different Voltage Classes for Optimized Fuel Saving to Cost Ratio to Market

This publication will give an overview of different voltage classes available in all kind of xEV (hybrid-, plug in hybrid-, and battery electric vehicle). What kind of power semiconductors should be used for what voltage class will be answered. The influence of different topologies at dedicated board net voltages on the selection for the power semiconductor will be explained.