Patent ID: 7786410
Filing Date: 2010-08-31
Classification: A47J

Abstract:
1. A method of controlling an electric kettle for “dry” burn prevention during heating process, comprising the steps of: (a) providing a temperature sensor, a microprocessor, and a control circuit to said electric kettle; (b) detecting a temperature of water in said electric kettle via said temperature sensor; (c) in responsive to said water temperature, determining a temperature rate change by said microprocessor and comparing said temperature rate change with a preset rate change threshold; and (d) when said temperature rate change is larger than said preset rate change threshold, sending a control signal to the control circuit, wherein when said temperature rate change is smaller than said preset rate change threshold, said microprocessor determines an acceleration rate change by said water temperature versus time, wherein when said acceleration rate change is larger than a preset acceleration change threshold, said microprocessor sends said control signal to said control circuit, and wherein when said acceleration rate change is smaller than said preset acceleration change threshold, said microprocessor re-obtains said temperature rate change at previous cycle and re-compares said temperature rate change at said previous cycle with said rate change threshold.