Efficient electrification of automotive drive systems

Automotive transmission system, the requirements of high performance semiconductor chips in line with the quality standards of the car. As a result, the power semiconductor and automotive electronics field have technical expertise, is the necessary conditions for the success of the emerging electric vehicles and hybrid vehicles ((H) EV) market. Infineon design with high efficiency (H) of all elements of the EV system.

(H) EV system, the main components of the power of the inverter, DC/DC converter, auxiliary inverter / converter, car charger and battery management. Power module, micro controller, driver, sensors, etc. (Figure 1) highly reliable semiconductor must support a variety of inverter power level, to help achieve a compact, economical, energy saving system design.

For example, the HybridPACK family supports this design goal, and its solution for (EV) H applications cover all power levels (-150kW 10kW). EiceDRIVER gate driver has an ideal function to drive and control IGBT. The product family includes a single / dual channel IGBT gate driver with high and low voltage isolation capability and bidirectional signal transmission characteristics. AURIX series of such high performance 32 bit micro controller is an effective supplementary energy efficient electric drive system product portfolio, and the position sensor can provide closed-loop motor position feedback constant field oriented control (FOC) control of such complex.

The latest generation of EiceDRIVER solutions play an important role in achieving economic and practical inverter design and implementation of ASIL system certification for (H) EV applications.

1EDI2001AS and 1EDI2002AS target applications for the use of 400V, 600V and IGBT 1200V (H) EV inverter. These two drivers are equipped with high and low voltage isolation, two-way signal transmission, active short circuit protection and optimization of the IGBT switch driver. These products are used for the control and diagnosis of the standard SPI, the transmission speed of up to 2Mbd. Security related features include: over current protection, as well as for all power, oscillator, gate level driver and output stages of the signal state monitoring. In addition, the system level diagnosis including error injection (injection error) and turn-on (weak) is also supported.

(H) EV applications often use brushless motor. These high efficiency motors rely on fast and accurate rotor position sensors for commutation, because the parameters of these sensors have a significant impact on the starting performance, dynamic performance, torque ripple and efficiency of the vehicle.

Different principle is usually used to detect the rotor position: rotating transformer (based on inductive type) and electromagnetic type. The sensor system based on the rotating transformer faces some limitations (such as analog output, complex circuit, high system cost, space restriction, sensitive to stray field and position tolerance). The 32 bit AURIX microcontroller family using the sigma delta converter to generate carrier signal and software based encoding, by avoiding the use of resolver decoder IC, will help reduce system cost about 20%.