Patent ID: 8131404

Claim:
A temperature regulating apparatus which regulates temperature, the apparatus comprising: a heater: a temperature detector configured to detect temperature; a calculator configured to calculate a manipulated value based on an error between a target temperature and the temperature detected by the temperature detector; and a power controller configured to supply power, having one of a voltage and current controlled in accordance with the manipulated value, to the heater, wherein the calculator includes a first calculator having at least a proportional element of the proportional element, an integral element and a derivative element, a second calculator configured to calculate a square root, the first calculator and the second calculator being coupled in series with each other, a third calculator and a fourth calculator, and wherein the first calculator is configured to perform the calculation using the error as an input to generate a first manipulated value, the second calculator is configured to calculate a square root of the first manipulated value to generate a second manipulated value, the third calculator is configured to compare a reference voltage and a voltage supplied to the power controller to generate a correction value, and the fourth calculator is configured to correct the second manipulated value based on the correction value and to generate the manipulated value.