METHOD AND APPARATUS FOR MULTIPLEXING DC STABILIZED POWER SOURCE

摘要

PURPOSE:To reduce a variation in a voltage to be applied to a load and to improve reliability by detecting a variation in a voltage drop of a matching diode by a detecting diode, and correcting the variation in the voltage to be applied to the load according to the variation in the voltage drop. CONSTITUTION:Input AC power of a DC stabilized power source 200 is rectified by a rectifier 11 and a capacitor 12, and applied to a primary winding of a transformer 13 through a transistor 18. A voltage generated in a secondary winding of the transformer 13 is rectified and smoothed by a rectifying diode 14 and a capacitor 15, and output. The output voltage is applied to an error amplifier 16 through a detecting diode 2, compared with a reference voltage generated from a reference voltage source 17, amplified and applied to a driving circuit 19. The circuit 19 alters an ON/OFF ratio of switching to control the transistor 18. A resistor 3 is so thermally connected as to supply a bias current to the diode 2 and that the diode 2 and the diode 1 become substantially the same temperature.