Washing Machine: High-End

Washing Machine: High-End Solutions from Texas Instruments

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Design Considerations

Today's state-of-the-art high-end appliances are more energy efficient, consume less water, and are smarter than the machines developed in years past. Texas Instruments has developed products to meet the challenges and requirements for these new sophisticated systems.

Energy Efficiency: Home appliance (a.k.a. white goods) motors are often oversized to account for the load torque changes and transients. Scalar techniques for control can result in inefficient systems and noisy operation. This, in turn, leads to a mediocre energy efficiency that hovers in the 40% to 50% range. By implementing the control system with TI's digital signal controllers, designers are able to implement smaller, quieter motors with energy efficiency as high as 85% - 90%. A high efficiency is necessary to receive a stamp of approval from a governing body such as the US Environmental Protection Agency and Department of Energy's STAR rating.

Power Factor Correction (PFC): PFC is a technique of counteracting the undesirable effects of electric loads that create a power factor that is less than 1. In washing machines, PFC is needed because of the continuous transients and surge currents exhibited by the electric motor during the wash cycle, for example. It is also used to boost the rectified mains voltage up to 300 V to 450 V, which is then used to power the 3-phase inverters which ultimately operate the electric motor. With TI products, PFC can be performed externally with a separate integrated circuit or it can be done in the digital signal controller eliminating the need for a separate external PFC controller.

IEC 60730 Compliance: Home appliance manufacturers continually introduce new design enhancements to their automatic electronic controls that ensure safe, reliable and efficient operation of the equipment. Among other things, the IEC 60730 specification discusses mechanical, electrical, electronic, EMC, and abnormal operation of AC appliances. For microcontrollers, the specification details new test and diagnostic methods for the real-time embedded software to ensure the safe operation of embedded control hardware and software. All TI TMSxx24xxxx and TMSxx28xxxx digital signal controllers support IEC 60730 compliance.

High-Voltage Isolation: For larger, higher-performance products where reliability and motor-control accuracy are key concerns, TI offers isolation products that block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

Integration: Texas Instruments provides fully-integrated solutions such as the digital signal controllers (for digital motor control, PFC, and other system functions), and relay drivers that provide up to 8 channels, zero-volt detection, and 5 V linear regulation for 5 V logic that may reside on the board.

Application Notes (22)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 01 Jun 2011 250
HTM 9 KB 21 Sep 2009 1776
HTM 8 KB 19 Aug 2008 1625
HTM 8 KB 15 Mar 2007 1423
HTM 8 KB 20 Dec 2006 1137
HTM 9 KB 07 Jun 2004 231
HTM 8 KB 12 May 2003 1112
HTM 9 KB 10 Jul 2002 2389
HTM 9 KB 29 Apr 1999 1116
HTM 9 KB 11 Feb 1999 293
HTM 8 KB 01 Jan 1998 339
HTM 8 KB 01 Jan 1998 3743
HTM 8 KB 01 Jan 1998 110
HTM 8 KB 01 Jan 1998 483
HTM 8 KB 01 Jan 1998 216
HTM 9 KB 01 Jul 1997 593
HTM 8 KB 01 Jan 1997 230
HTM 9 KB 01 Jan 1997 344
HTM 8 KB 01 Jan 1997 240
HTM 8 KB 01 Jan 1997 103
HTM 8 KB 01 Jan 1996 982
HTM 8 KB 01 Jan 1996 576
    

Selection and Solution Guides

Selection Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 5.57 MB 12 Aug 2014 6753

Solution Guides (2)

Title Abstract Type Size (KB) Date Views
PDF 5.83 MB 26 Jan 2014 13305
PDF 11.09 MB 19 Jun 2013 3691

Tools and Software

Name Part # Company Software/Tool Type
F280x Digital Motor Control Library SPRC215 Texas Instruments Application Software & Frameworks

Product Bulletin & White Papers

White Papers (7)

Title Abstract Type Size (MB) Date Views
PDF 905 KB 31 Jul 2014 3709
PDF 658 KB 09 Jul 2014 3309
PDF 393 KB 27 Jun 2014 13034
PDF 179 KB 20 Apr 2012 2714
PDF 667 KB 05 Mar 2012 1374
PDF 113 KB 14 Feb 2012 219
PDF 379 KB 21 Jan 2008 593

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