| 摘要 |
<p>By employing a new phase control for a fixation heater using a first and a second heater, it is possible to suppress generation of higher-harmonic current and power supply line terminal noise. For each of the first and the second heater (1, 2), continuous four half wavelengths (two cycles) are used as a cycle, during which two half-waves are phase controlled while the other two half-waves are put to a full electrical connection or a non-electrical connection. Simultaneously with this, the both heaters are subjected to complementary phase control. That is, for each half-wave, one of the heaters is phase-control electrically connected while the other heater is fully connected or not connected. Thus, electric connection switching generated within a half-wave period is one heater at the most. As a result, as compared to the ordinary phase control, it is possible to reduce the power supply higher-harmonic current and terminal noise occurring on the power supply line.</p> |
