| 摘要 |
PURPOSE:To keep the consumed power of a heating body at a prescribed value or below regardless of the voltage of a power source. CONSTITUTION:This heating body is constituted as follows. The temperature-rise ratio of a body to be heated 1 per an unit hour is detected at the conductive angle of 180 deg. (all lighting), at the time of supplying a power source. When the temperature-rise ratio of the body to be heated 1 if higher than the prescribed value, a prescribed small conductive angle is gradually enlarged, to keep the temperature-rise rate of the body to be heated 1 at the prescribed value. On the other hand, when the temperature-rise ratio of the body to be heated 1 is lower than the prescribed value, a power control element 6 is turned on/off at the conductive angle of theta=180 deg., to keep the temperature-rise rate of the body to be heated 1 at the prescribed value. |
