| 摘要 |
<p>PURPOSE:To effect dust collection efficiently by providing a thyristor, a high tension transformer, a high tension electric current device, and a circuit for controlling thyristor. CONSTITUTION:A pulse width T1 and an interval T2 between two successive pulses are set freely by means of variable resistances R1, R2 respectively, while a pulse height A1 and pulse base height A2 are set freely by means of variable resistances R3, R4. In the case of an automatic operation, control is conducted by means of the variable resistance R3 or an optimum control of the variable resistances R1-R4 is performed by means of a microcomputer. And the voltage at point E is nearly equal to that at point A, while a transistor TR1 is inserted as an emitter follower for effecting a current amplification and impedance conversion. By controlling the thyristor by utilizing said control circuit, high D.C. voltages are intermittently applied to effect the dust collection of smoke.</p> |
