Accession Number : AD0727639

Title :   Power Supply PP-6418( )/U.

Descriptive Note : Final rept. Jun-Dec 70,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CALIF

Personal Author(s) : Cronin,D. L.

Report Date : JUN 1971

Pagination or Media Count : 53

Abstract : The power supply, designated POWER SUPPLY PP-6418( )/U, furnishes 0-100 amperes DC over an output voltage range of 24 to 32V DC from a nominal 120/208V AC, 50, 60, 400, or 1600 Hz, three phase power source and can be used for battery charging from 5A to 100A and floating of batteries across the DC output at end of charge. (Modified constant potential charging mode with variable current limiting.) The high reliability power supply design incorporates state-of-the-art switch modulation power processing technology to overcome size, weight, efficiency and performance limits typically obtained in conventional design. Efficiency, weight and size achieved are approximately 90 percent, 56.9 pounds and 1.22 cu. ft., respectively. Line voltage is directly rectified to produce a DC voltage which is further processed to achieve the desired nominal voltage level of 28V DC. The heart of the power processing system is a very efficient silicon controlled rectifier (SCR) series capacitor type inverter, arranged in a two-phase configuration, which embraces special features of power modulation and active filtering. Static and dynamic regulation, one order of magnitude better than realized by present state of the art equipment, is obtained through a novel two-loop method, effecting a form of frequency modulation control with individual inverter pulse repetition rates of approximately 14 kHz under nominal line and load conditions. Remote sensing, over/undervoltage and overload protection are provided. (Author)

Descriptors :   (*POWER SUPPLIES, SILICON CONTROLLED RECTIFIERS), BATTERY CHARGERS, DIRECT CURRENT

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE