Appliance Design - February 2009 - (Page 35) SHIELDING & EMI Motor or Enclosure Difference Between Enclosure VCM VDiff VCM Difference Between Cables Difference Between Enclosure Fig. 5. An EMI example, unfiltered motor, or enclosure. Radiated Emissions (DC Motor) 60 No EMI Filter 50 40 dBµV 30 (4) Components: 2 capacitors, 2 inductors 20 (7) Components: 3 capacitors, 4 inductors 10 (1) X2Y® capacitor For superior solutions in industrial electronics 600 700 800 900 1000 0 0 100 200 300 400 500 Frequency (MHz) Fig. 6. Radiated emissions: EMI filter comparisons. nents that may have yet to surface under different DC motor operating conditions. A closer look at the noise source and cause of emissions reveals that switching DC motors and power supplies have power delivery cables that also serve as convenient and efficient antenna for the transmission of unwanted emissions. Through these cables, DC motors can generate conducted (CE) and radiated emissions (RE) to the extent that a product will fail EMC compliance. EMI noise propagates when there is a voltage difference between the power cables and the motor case/enclosure, and a difference between each cable of a pair. Effective noise reduction with www.applianceDESIGN.com any EMI filter requires placing the filter at the cable I/O to stop propagation of EMI and, ideally, the filter components should provide a balanced voltage potential between power cables and the enclosure. (See Fig. 5.) Typical EMI suppression required for DC motors in automotive applications consists of four to seven capacitors and inductors in combination as shown in Fig. 6 [3, 4]. Many filter components are needed because self-imposed automotive radiated emission limits are well below commercial or military limits [5]. How does the X2Y capacitor outperform a network of conventional shunt capacitors and the series inductors? Conventional www.epcos.com applianceDESIGN February 2009 35 AD02094Epcos.indd 1 1/14/09 11:22:08 AM http://www.epcos.com http://www.epcos.com http://www.appliancedesign.com
Table of Contents Feed for the Digital Edition of Appliance Design - February 2009 Appliance Design - February 2009 Contents Editorial Shipments/Forecasts News Watch Force-Sensing Technology Offers Designers an Alternative Approach to Creating Touch-Control Interfaces A Flammable Vapor Sensing Technology that was Originally Developed for use in Water Heaters has Evolved for use in a Broader Array of Applications Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components Design Marts Association Report: AHRI Advertisers’ Index Appliance Design - February 2009 Appliance Design - February 2009 - Appliance Design - February 2009 (Page Cover1) Appliance Design - February 2009 - Appliance Design - February 2009 (Page Cover2) Appliance Design - February 2009 - Appliance Design - February 2009 (Page 1) Appliance Design - February 2009 - Appliance Design - February 2009 (Page 2) Appliance Design - February 2009 - Contents (Page 3) Appliance Design - February 2009 - Editorial (Page 4) Appliance Design - February 2009 - Shipments/Forecasts (Page 5) Appliance Design - February 2009 - News Watch (Page 6) Appliance Design - February 2009 - News Watch (Page 7) Appliance Design - February 2009 - News Watch (Page 8) Appliance Design - February 2009 - News Watch (Page 9) Appliance Design - February 2009 - News Watch (Page 10) Appliance Design - February 2009 - News Watch (Page 11) Appliance Design - February 2009 - Force-Sensing Technology Offers Designers an Alternative Approach to Creating Touch-Control Interfaces (Page 12) Appliance Design - February 2009 - Force-Sensing Technology Offers Designers an Alternative Approach to Creating Touch-Control Interfaces (Page 13) Appliance Design - February 2009 - Force-Sensing Technology Offers Designers an Alternative Approach to Creating Touch-Control Interfaces (Page 14) Appliance Design - February 2009 - Force-Sensing Technology Offers Designers an Alternative Approach to Creating Touch-Control Interfaces (Page 15) Appliance Design - February 2009 - A Flammable Vapor Sensing Technology that was Originally Developed for use in Water Heaters has Evolved for use in a Broader Array of Applications (Page 16) Appliance Design - February 2009 - A Flammable Vapor Sensing Technology that was Originally Developed for use in Water Heaters has Evolved for use in a Broader Array of Applications (Page 17) Appliance Design - February 2009 - A Flammable Vapor Sensing Technology that was Originally Developed for use in Water Heaters has Evolved for use in a Broader Array of Applications (Page 18) Appliance Design - February 2009 - A Flammable Vapor Sensing Technology that was Originally Developed for use in Water Heaters has Evolved for use in a Broader Array of Applications (Page 19) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 20) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 21) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 22) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 23) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 24) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 25) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 26) Appliance Design - February 2009 - Latches, Hinges, and Slides Must Reliably Secure Parts Together, Sometimes for Hundreds of Thousands of Cycles. Beyond their Utilitarian Functions, They Can Also Change Consumer Perceptions (Page 27) Appliance Design - February 2009 - Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well (Page 28) Appliance Design - February 2009 - Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well (Page 29) Appliance Design - February 2009 - Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well (Page 30) Appliance Design - February 2009 - Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well (Page 31) Appliance Design - February 2009 - Elastomeric Electrical Connectors Can Solve Space Constraint Problems in Electronic Products and Provide Some Cost Advantages as Well (Page 32) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 33) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 34) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 35) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 36) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 37) Appliance Design - February 2009 - A Multi-Layer Ceramic Capacitor with a Novel Electrode Design Can Suppress Electromagnetic Interference, Improve Circuit Performance, and Reduce the Number of Needed Components (Page 38) Appliance Design - February 2009 - Design Marts (Page 39) Appliance Design - February 2009 - Association Report: AHRI (Page 40) Appliance Design - February 2009 - Advertisers’ Index (Page 41) Appliance Design - February 2009 - Advertisers’ Index (Page Cover4)
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