AN4043 datasheet(6/60 Pages) STMICROELECTRONICS

6 / 60 page

Inverter design concept and SLLIMM-nano solution

AN4043

6/60

Doc ID 022726 Rev 2

Inverter design concept and SLLIMM-nano solution

Motor drive applications, ranging from a few tens of watts to mega watts, are mainly based

on the inverter concept thanks to the fact that this solution can meet efficiency, reliability,

size, and cost constraints required in a number of markets.

As shown in

Figure 1, an inverter for motor drive applications is basically composed of a

power stage, mainly based on IGBTs and freewheeling diodes; a driving stage, based on

high voltage gate drivers; a control unit, based on microcontrollers or DSPs; some optional

sensors for protection and feedback signals for controls.

The approach of this solution with discrete devices produces high manufacturing costs

associated with high reliability risks, bigger size and higher weight, a considerable number

of components and the significant stray inductances and dispersions in the board layout.

In recent years, the use of intelligent power modules has rapidly increased thanks to the

benefits of greater integration levels. The new ST SLLIMM-nano family is able to replace

more than 20 discrete devices in a single package.

Figure 2 shows a comparison between a

discrete-based inverter and the SLLIMM-nano solution, the advantages of SLLIMM-nano

can be easily understood and can be summarized in a significantly improved design time,

reduced manufacturing efforts, higher flexibility in a wide range of applications, and

increased reliability and quality level.

In addition, the optimized silicon chips in both control and power stages and the optimized

board layout provide maximized efficiency, reduced EMI and noise generation, higher levels

of protection, and lower propagation delay time.

Figure 1.

Inverter motor drive block diagram

AN4043 Datasheet(PDF) 6 Page - STMicroelectronics