POWER SUPPLY SYSTEM FOR AND METHOD OF ENERGIZING MULTIPLE LEVEL LOADS

摘要

A power supply for a direct current load that has two power level requirements senses the current requirements of the load and operates a high output inverter at high power requirements and a low output inverter at low power requirements. The high and low output inverters are designed for maximum efficiency in their respective power ranges and are connected through full wave rectifying bridges to the load. The high power inverter is maintained in an "off" position until the load current requirement is increased. Upon the increase in current, a sensing circuit and energy storage device activates a switch to energize the high power inverter to power the load as long as the current requirements remain above a selected level.