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Washing Machine: High-End

Washing Machine: High-End Solutions from Texas Instruments

Block Diagram


Amplifier Amplifier General-Purpose Logic I/O Expander Isolation & Gate Drivers Motor Control Processor Power Factor Correction Power Management Relay/LED Driver Sensor & Monitor Standard Linear

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

  • Flash Programming Solutions for the TMS320F28xxx DSCs (spraal3.htm, 8 KB)
    19 Aug 2008 Abstract
  • Optimizing Digital Motor Control Libraries (spraak2.htm, 8 KB)
    15 Mar 2007 Abstract
  • Using Enhanced Pulse Width Modulator (ePWM) Module for 0-100% Duty Cycle Control (spraai1.htm, 8 KB)
    20 Dec 2006 Abstract
  • Reliability Data for TMS320LF24x and TMS320F281x Devices (Rev. A) (spra963a.htm, 8 KB)
    09 Nov 2005 Abstract
  • Converting Analog Controllers to Smart Controllers with the TMS320C2000 DSPs (spra995.htm, 9 KB)
    07 Jun 2004 Abstract
  • Getting Started in C and Assembly Code with the TMS320LF240x DSP (Rev. A) (spra755a.htm, 9 KB)
    10 Jul 2002 Abstract
  • 3.3 V DSP for Digital Motor Control (spra550.htm, 9 KB)
    29 Apr 1999 Abstract
  • Space-Vector PWM with TMS320C24x Using H/W & S/W Determined Switching Patterns (spra524.htm, 9 KB)
    11 Feb 1999 Abstract
  • Field Oriented Control 3-Phase AC-Motors (bpra073.htm, 8 KB)
    01 Jan 1998 Abstract
  • AC Induct'n Motor Control Using Constant V/Hz Principle/Space Vector PWM- 'C240 (Rev. A) (spra284a.htm, 8 KB)
    01 Jan 1998 Abstract
  • Creation of Pulse Width Modulated Signal With a Fixed Duty Cycle (spra410.htm, 8 KB)
    01 Jan 1998 Abstract
  • Creating a Sine Modulated PWM Signal (spra411.htm, 8 KB)
    01 Jan 1998 Abstract
  • Generating a PWM Signal Modulated by an Analog Input (spra413.htm, 8 KB)
    01 Jan 1998 Abstract
  • DSP Solutions for Motor Control Using the TMS320F240 DSP Controller (spra345.htm, 9 KB)
    01 Jul 1997 Abstract
  • DSP Solutions for BLDC Motors (bpra055.htm, 8 KB)
    01 Jan 1997 Abstract
  • Sensorless Control With Kalman Filter on TMS320 Fixed-Point DSP (bpra057.htm, 9 KB)
    01 Jan 1997 Abstract
  • Implementation of a Speed Controlled Brushless DC Drive Using TMS320F240 (bpra064.htm, 8 KB)
    01 Jan 1997 Abstract
  • Implementation Sensorless Speed Controlled Brushless DC Drive Using TMS320F240 (bpra072.htm, 8 KB)
    01 Jan 1997 Abstract
  • DSP Solution for AC Induction Motor (bpra043.htm, 8 KB)
    01 Jan 1996 Abstract
  • DSP Solution for Permanent Magnet Synchronous Motor (bpra044.htm, 8 KB)
    01 Jan 1996 Abstract
    

Selection and Solution Guides

Selection Guides

  • Amplifier and Data Converter Selection Guide (Rev. B) (slyb115b.pdf, 3.87 MB)
    01 Jun 2007 Download
  • Logic Selection Guide 2007 (Rev. Z) (sdyu001z.pdf, 2.79 MB)
    24 Apr 2007 Download
  • Interface Selection Guide (Rev. C) (sszt009c.pdf, 1.24 MB)
    13 Sep 2006 Download

Solution Guides

  • Industrial Solutions Guide (Rev. C) (slab039c.pdf, 2.35 MB)
    15 Jan 2006 Download

Tools and Software

Name Part # Company Software/Tool Type
F280x Digital Motor Control Library SPRC215 Texas Instruments Application Software
TMS320F2808 eZdsp Starter Kit (DSK) TMDSEZS2808 Texas Instruments Starter Kits

Product Bulletin & White Papers

White Papers

  • Combining Inrush Current Limiting with PFC for White Goods Motor Applications (sluy001.pdf, 379 KB)
    21 Jan 2008 Download

News Releases & Authored Articles

News Releases

Date Headline
19 Feb 2008 New TI TMS320C2000™ DSCs provide fixed point affordability and floating point ease-of-use to enable energy-efficient industrial applications

Authored Articles

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