| 摘要 |
PURPOSE:To increase the electric power to be obtained by providing the first switching element and the second switching element for bypassing the first element through a Zener diode in a base circuit of a main transistor. CONSTITUTION:A stabilized DC voltage is produced from the secondary side by turning a transistor Tr1 ON and OFF at the primary side of a transformer T. At this time, a diode d2 and a capacitor C3 are connected to the tertiary winding n3 of the transformer T, one terminal is connected to the base of the Tr1, and the intermediate is connected to the base of the Tr1 through a series circuit of a transistor Tr2 and a Zener diode ZD and a transistor Tr3 for bypassing it. Accordingly, the Tr2, Tr3 are cooperatively operated to flow the current tending to flow to the base of the Tr1 through a bypass, thereby extracting the base current of the Tr1 in an extremely short time and enabling to obtain a large power. |
