In the mild hybrid vehicle system, the 48V battery and the integrated starter generator (ISG) are the main components. ISG is responsible for generating all the electric energy of the vehicle and for starting the vehicle. This article will introduce the characteristics and advantages of ONSEMI’s APM16M module in the application of ISG.

In the mild hybrid vehicle system, the 48V battery and the integrated starter generator (ISG) are the main components. ISG is responsible for generating all the electric energy of the vehicle and for starting the vehicle. This article will introduce the characteristics and advantages of ONSEMI’s APM16M module in the application of ISG.

Different operating modes are controlled by the ISG system controller, which can control positive or negative torque according to the requirements of the system. During the start-up process, ISG provides positive torque, quickly and smoothly increasing the engine speed to operating speed. During the braking process of the car, it also recovers regenerative energy. In this mode, SGI acts as a generator to provide negative torque to the powertrain, slowing the car and recovering battery charge. The ISG with larger charge capacity (>15kW) can also work in torque boost mode, providing enough positive torque to help drive the vehicle in a limited time.

The motors used in the ISG system are different in structure. Many use permanent magnet designs, and the recent design trend is toward a single excitation winding rotor structure. The main advantage of these types is their superior failure mode operation. These stators are usually designed with three-phase or six-phase coil windings. Lower power system (
Regardless of whether three-phase or six-phase is selected, each winding requires a half-bridge power converter to provide proper excitation. For lower power level systems, discrete power devices can be used, but for higher power systems, discrete device design is not practical. The current in these systems can reach more than 700 A-rms. Under these higher current level applications, the heat dissipation performance of the device is a crucial factor in determining system performance.

The ONSEMI APM16 module uses special materials and craftsmanship inside, so the APM module has the following characteristics:

APM modules will have a smaller temperature rise than discrete devices;

APM modules have smaller thermal resistance than discrete devices;

APM modules have better EMI performance than discrete devices;

The integration of APM modules will be better than discrete devices, and the power density will be higher.

Based on the characteristics of APM, the Power Module is a better choice for high current occasions.

 What are the structural differences between the motors used in the ISG system?

Figure 1B 6-phase ISG inverter drive

What are the structural differences between the motors used in the ISG system?

Figure 1 shows two different ISG automotive power module application circuits, using three-phase and six-phase output stages. Both systems use three common APM16M power modules. The module contains a two-phase, dual-half-bridge circuit, which can be used in three- or six-phase designs, just use a separate half-bridge or connect them in parallel. The size of the power MOSFET meets the current requirements of the system, and 80V and 100V versions are available. They are mounted on alumina ceramic substrates to achieve excellent thermal performance. For extremely demanding applications, high-performance aluminum nitride substrate materials can be used to provide higher thermal performance.

If you have a small partner who wants to know more about the above design, please contact ZLG Ligong Technology, we will provide you with professional services and support.

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