| 摘要 |
PURPOSE:To reduce the number of parts and the size of the titled unit by connecting one current transformer to every two circuits. CONSTITUTION:A rectangular pulse from an oscillator 1 is sent to a control circuit 2a, which sends rectangular pulses with different phases by 180 deg. each other to transistors TR3, TR4. Therefore, one circuit system from the TR3 to a rectifier D1 and the other system from the TR4 to a rectifier D2 operate in a phase reversed each other, i.e., when one system is in operating, the other is in a suspending cycle. An overcurrent detecting signal is supplied to the windings N1, N2, N3 of a current transformer CTO for detecting the collector current generated in accordance with the switching operation of output transistors TR1, TR2 and a rectifier 2a to attain protective control. Namely the overcurrent of the TR1 is sent to the control circuit 2a through a bridge rectifier D9 and the overcurrent of the TR2 is sent also to the control circuit 2a in the same direction as a pulse from the TR1 through the bridge rectifier D9 although a reversed detecting pulse is induced by the windings N2, N3. |
