| 摘要 |
<p>PURPOSE:To prevent elements from being overheated and destroyed, by determining oscillation frequency with the inductance of an inverter circuit and the capacitance of a ceramic oscillator, and by operating a switching element. CONSTITUTION:So far as an inverter circuit 12 in self-exciting system connected to a driving DC power source 11 is concerned, the positive pole of the power source 11 is connected to the center of the primary winding 14 of a transformer 13, and is connected to the negative pole of the power source 11 via a first transistor (Tr)16 from a first primary winding 15 on one side, and is connected to the positive pole of the power source 11 via a second Tr 18 from a second primary winding 17 on the other side. Besides, to the Tr 16, 18, starting resistors 19, 20 are connected, and a winding 23 for a switching element is connected. To the secondary winding 21 of the transformer 13, a ceramic oscillator 22 resonating with the inductance is connected. Then, by the capacitance of the oscillator 22, the oscillation frequency of the inverter circuit is determined for driving, and so the overheating of the Tr 16, 18 can be prevented from being caused.</p> |
