Appliance Design - March 2008 - (Page 37)

SWITCHES & RELAYS Fig. 7. Melting chocolate in a frypan. It requires no external power supply and can also be microcontroller driven. Skillet solution The extended relay life and temperature control via NTC sensor provided by the IES5541A make it the ideal solution for the electric skillet. The electronic control and faster cycle rate possible with the IES5541A allows very accurate and constant temperature to be maintained in the pan. Fig. 4 shows a circuit diagram of the IES5541A in a typical heater control application. A very flat temperature profile with negligible overshoot can be achieved using high power elements and low thermal mass pans. Fig. 5 shows the temperature performance characteristic of the IES5541A when used to control a typical electric skillet. The temperature varies by less than 5 DegC, even at a control temperature of 50 DegC. Improving the temperature control to a point where applications not previously possible, for example, melting chocolate directly, can now be achieved, without burning, overcooking or overheating. Fig. 6 shows the temperature profile for melting chocolate. The IES5541A gives appliance designers an innovative and highly effective option for temperature and load control in cooking appliances, particularly electric skillets. The designer can replace bi-metal thermostats in temperature-control applications with protected relays, to ensure www.applianceDESIGN.com more accurate and constant temperature control, resulting in a more usable cooking utensil. The constant pan temperature provided by the IES5541A gives faster cooking times, uniform cooking throughout the food, extended cooking surface lifetime, and extends the application of the electric skillet to preparation of confectionary, crepes and other delicate cooking uses not previously possible. < For more information, enter . . . . . . . . . . . . . . . 303 or email: hendon .info@ies-sa .com .au LOW COST Variable Speed Controls For Fans, Blowers, Humidiers, Stoves, Heaters, Whole House Ventilators, Range Hoods, Lamps. . . DIAL-A-TEMP Plug-In 2.5 Amps-120VAC. KBWC-Wall Box Mount 2.5, 5.0, 6.0, 8.0, 10.0, 12.0 & 15.0 Amp models, 120 & 240VAC, 50/60Hz. KBMC-Panel Mount 2.5, 3.0 & 4.0 Amp models, 120 & 240VAC, 50/60Hz. Designed for Shaded Pole, AC/DC and Permanent Split Capacitor (PSC) Motors. Send for complete literature. If it’s not in our catalog, let KB engineers design a custom control for your application. KB Electronics, Inc. 12095 N.W. 39th Street • Coral Springs, FL 33065-2516 954 346-4900 • Fax: 954 346-3377 • Outside FL 800 221-6570 www.kbelectronics.com • Email: info@kbelectronics.com For more Information Enter 110 applianceDESIGN AD03084KB.indd 1 March 2008 37 1/24/08 9:48:41 AM http://www.kbelectronics.com http://www.kbelectronics.com http://www.appliancedesign.com

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Appliance Design - March 2008 Contents Editorial Shipments/Forecasts News Watch A New Appliance is Set to Break into Homes Soon - the Micro CHP Unit, which Generate both Heat and Power. Thermally Enhanced Varistors Help Protect Low-Power Systems Against Damage Caused by Over-Current, Over-Temperature and Over-Voltage Faults. Hybrid Controller Reduces Standby Power Consumption and Improves Active-Mode Efficiency. Battery-Management ICs Solve Design Challenges for Cordless Appliances Using High-Voltage, Lithium-Ion Battery Technology. A Semiconductor Solution Protects the Relay in a Temperature Controller for a Cooking Appliance. New Polyurethane Foam Insulation System Optimizes both Insulation Performance and Productivity. Innovations in Decorative, Pre-Finished Metals Expand Range of Design Options for Appliance Designers. Design Marts Association Report: AHAM Advertiser's Index

Appliance Design - March 2008

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