Uninterrupted DC power supplies

Primary power source dropouts can cause voltage transients or loss of conditioned power to critical or essential electric power-using equipment. Some of the power loads require controlled transient power, that is , conditioned power which at all times is contained within specified voltage regulation limits. Critical loads which can tolerate a temporary loss of power can be satisfied by the availability of a standby power source. Essential loads which require controlled transient power supply voltage must include in the system configuration of the uninterrupted power supply, an active energy storage element. There are three basic ways in which the controlled transient uninterrupted DC power supply can be configured. The special features of the three systems are compared and the most suitable application for each system is indicated. To illustrate the reduction to practice of one of the controlled transient uninterrupted power supply configurations, a 3KW uninterrupted DC power supply developed for the U. S. Army ECOM by TRW Systems is described indetail.