Dave Sackett is a senior field applications engineer with Maxim Integrated Products, Sunnyvale, Calif. He has a BSEE from the Rose Hulman Institute, Terre Haute, Ind., and an MBA from Indiana State University, Bloomington, Ind. Email address: Dave_Sackett@maximhq.com
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December 15, 2006[Ideas For Design] Supply Constant Power Level To A Varying Load Impedance
How do you deliver constant power when the load impedance isn't constant? That problem arises, for example, in trying to maintain a warm LCD display on an outdoor gas pump in cold climates. As the heating element changes temperature, its resistance changes as well. That variation is characterized by the temperature coefficient of the heating element. If you apply a constant voltage, power delivered to the load will vary inversely with the load resistance. In...
