Belt starter generator 48V – Inverter ISG
Low integration costs and development efforts
The P0 powertrain configuration with the Belt-driven integrated Starter Generator (BiSG) is the lowest integration cost and lowest development effort for a 48V mild-hybrid electrical system. The electrical machine operates up to 10 kW maximum peak power with low power density in a 3-phase or 6-phase configuration. However, for the BiSG, the electrical machine torque is limited for boost by the belt connection and the engine and transmission friction losses reduce the recuperation efficiency.
Infineon offers a complete and comprehensive system solution ranging from supply IC’s, microcontroller, sensors, smart power driver, high power MOSFET, and transceivers. The block diagram below shows the basic layout of the semiconductors used to control a BiSG with exciter winding (separate excitation of the synchronous machine). Here, the µC enables both field-oriented control of the electric motor and control of the exciter winding in alternator operation. According to safety requirements, the key components µC, PMIC, and 3 phase Gate Driver are ISO26262 ASIL-D compliant.