| 摘要 |
PURPOSE:To obtain an output voltage excellent in linearity by providing a capacitive element which is charged during ON interval of one pair of switching elements connected in a full-bridge and feeds the primary winding of a transformer with a charging voltage superposed on a DC power supply voltage during ON interval of the other pair of switching elements. CONSTITUTION:One pairs of transistors TR1, TR4 and the other pair of transistors TR2, TR3 connected in a full-bridge in each switching circuit (SW) 4a, 4b, 4c are switched alternately to feed three primary windings of a transformer 2 intermittently with a DC power supply voltage divided by three which are applied to the SW 4a, 4b, 4c. Consequently, the switching voltage is set automatically during ON interval of the other pair of transistors TR2, TR3 in the SW 4a, 4b, 4c and zero voltage interval is eliminated from the secondary output voltage of the transformer 2 thus producing an output voltage excellent in linearity across the capacitor C. |
