| 摘要 |
<p>The invention includes a rectifier 10, a switching part 20 to generate the high frequency current, a pulse with modulator 30 to generate driving signal for switching operation, a controller 40 to control the pulse with modulator 30, a coil unit 50 to generate magnetic field to bond the materials 3. The controller 40 firstly controls the pulse width modulator 30 to generate a driving signal with the first duty ratio to raise the temperature to a target temperature, and then a reduced second duty ratio to keep the temperature of the electro-conductive member 2 at the target temperature.</p> |
