D.C. power supply with improved transparency to power interrupts

摘要

A d.c. power supply for computer logic circuits which is sensitive to brief interruptions in a.c. source power. The power supply includes an input transformer providing first and second a.c. voltages which are rectified to first and second d.c. voltage, the second d.c. voltage being of greater magnitude than the first d.c. voltage. A linear voltage regulator receives the first d.c. voltage as normal input and provides a third d.c. voltage of lesser magnitude than the first d.c. voltage. A storage capacitor is charged by the second d.c. voltage. A differential amplifier detects an interruption in source power and causes the storage capacitor to be connected to the input of the regulator whereby the regulator output is maintained during a brief interruption in source power by the discharge current of the storage capacitor.