Project Analog - August 2008 - (Page 11)

PWM and motor-control peripherals. These provide a programmable platform capable of hosting a third-party or in-house motor control algorithm. Alternative solutions are available that implement the motor control algorithm directly in hardware, which eliminates software development and integration challenges and also speeds up algorithm execution to enhance torque and speed control. Whichever solution is preferred, the digital control challenges can now be solved quite quickly. However, the other major hurdle is to design and integrate the power stage. Configuring a suitable inverter, gate driver, and associated protection circuitry requires considerable power electronics design skills. fiG. 2 GraPh ShoWS ThE maximum ouTPuT currENT aT variouS SWiTchiNG frEquENciES. fiG. 1 ThE DESiGN Tool GraPhS of PoWEr loSS vS.PhaSE currENT aND caSE TEmPEraTurE. The IPM absorbs much of the engineering effort associated with complex power system design for motion control applications. For example, gate impedances are preoptimized for lower EMI noise and power loss, and bootstrap diodes and resistors are also integrated to drive high-side IGBTs. Driver layout challenges are addressed to minimize losses due to parasitic effect and to maximize thermal performance, and protection against over-current and overtemperature is also built-in. The engineer simply has to choose the right IPM for the intended application. However, even this can be a daunting task. The performance of the IPM in a system depends on many application-related parameters, such as the switching frequency, modulation index, and module case temperature. Datasheets provide some guidance, but usually relate to standard operating conditions. Designers need extra help to predict performance in a specific application. Contents Viewpoint Gate Drive Schemes for Motor Control Applications Considerations When Selecting the Proper MOSFET Driver Power Modules for Variable-Speed Motor Control Analog news InteGrated power moduleS An integrated power module (IPM) combines all of the aforementioned elements into a single unit, reduces design time and delivers additional benefits including reduced component count and increased reliability. Microchip analog page Motor Control Design Center Sample center microchipDIRECT Reference designs/ app notes Technical training 11 · PrOjECT ANAlOG · VOluME 2 / NuMbEr 5 http://www.microchip.com http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2125¶m=en026178 http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2125¶m=en026178 http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

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Project Analog - August 2008 Contents Viewpoint About Project Analog Sponsor Gate Drive Schemes for Motor Control Applications Considerations When Selecting the Proper MOSFET Driver for Your Application Power Modules for Variable-Speed Motor Control Efficient Motor/Controls Save Terrawatt-Hours/Year Analog News Contact Microchip Treelink Microchip Advanced Parts Selector (MAPS)

Project Analog - August 2008

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