Patent ID: 8150558
Filing Date: 2012-04-03
Classification: G05D

Abstract:
1. A method for controlling the temperature of an object to maintain a constant target temperature, the method comprising the steps of: providing a heater; providing a control unit in communication with the heater and in communication with a temperature sensor that senses an ambient temperature of the object located on the heater, wherein the control unit monitors the temperature of the object located on the heater and supplies electric power to the heater for controlling the temperature of the object located on the heater, based on a calorific value Q of the heater calculated according to the following equation (1) causing the control unit to perform a first temperature control step with respect to the object located on the heater of controlling a heater output, the heater output being provided with a fixed value until the temperature of the object reaches a target temperature; and after the temperature of the object reaches the target temperature, causing the control unit to perform a second temperature control step of controlling the heater output based on formula (1), so that an amount of change in the temperature of the object from the target temperature per each control cycle is controlled to be zero; wherein in formula (1), Q represents a calorific value from the heater, T