Switching electric power source

Abstract

Abstract PURPOSE: To make it possible to execute the stable operation by high supply voltage, by forming the structure so that the blocking oscillator can be connected in series to the supply voltage. CONSTITUTION: Each blocking oscillator 1, 2 uses in common the primary winding L 1 of the transformer T 1 , also has the feedback windings L f1 , L f2 coupled with the primary winding L 1 , respectively, and the time when the transistors Q 1 , Q 2 are turned on and off is almost same. The supply to load through the output terminals A, B is executed by switching the primary side of the transformer T 1 , inducing voltage to the secondary winding L 2 , and rectifying and smoothing this voltage by the diode D 5 and the capacitor C 3 . In this case, since the flyback voltage proportional to the DC output voltage E 0 is generated in the feedback winding L f2 , the DC negative voltage E c proportional to the DC voltage E 0 is obtained by the control circuit 3 by rectifying said voltage, and the base of the transistor Q 2 is controlled through the constant-voltage diode ZD 1 . COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Motoyoshi Fujita

Bibliographic Details