HIGH ACCURACY MULTIOUTPUT FORWARD DC/DC CONVERTER

摘要

PURPOSE:To accurately stabilize the output voltage of a multioutput forward DC/ DC converter in which smoothing coils are electromagnetically coupled by inserting an auxiliary switch between the smoothing coil of the sub output and the condenser. CONSTITUTION:A rectangular wave voltage is generated from a DC power source 1 and a main switch 3, and rectangular voltages of various voltage levels are supplied from a transformer to respective output circuits insulated between input and output and between the outputs. The respective rectangular voltage are applied through diodes 21-2n of a rectifier circuit to electromagnetically coupled smoothing coils 41-4n, and further applied directly to a smoothing condenser 61 in a main output circuit and through auxiliary switches 52-5n to respective smoothing condensers 62-6n in a sub output circuit. The reference voltage is compared with the output by feedback circuits PWM1-n to control the on time of the respective switches.