| 摘要 |
PURPOSE:To prevent the malfunction of the title power supply without adding an OR diode and to make the efficiency of the title power supply high by installing a malfunction-preventing circuit in an ON-OFF control circuit for switching elements, for rectification, which are connected respectively across both ends of an output winding for a transformer. CONSTITUTION:When a voltage across terminals A, B at an output winding N2 for a transformer 5 is 0, bipolar transistors 14, 15 are set to a continuity state when a voltage which makes a terminal 8 a positive electrode or a voltage which exceeds the threshold voltage of a switching element 1 or 2 is applied across output terminals 8, 9 from the outside, and consequently, switching elements 1, 2 are turned off. Then, when an inter-terminal voltage at the transformer 5 alternately starts to be generated, the bipolar transistors 14, 15 repeat their turning-on-and-off operation alternately in synchronization with the voltage, the switching elements 1, 2 repeat their turning-on-and-off operation alternately, and a DC voltage is output via an output filter which is constituted of an inductor 6 and a capacitance 7. |
