12_15_V_AT_500_W

Published:2009/7/17 3:36:00 Author:Jessie | From:SeekIC

Developed to permit operation of high-power mobile solid-state amateur transmitter in home. Current sensing is done with 15-milliohm resistor R16. Short-circuit cutoff is provided by regulator along with current limiting through R16. Output voltage begins dropping as load exceeds 35 A. When voltage drops below 8 V, Q1 turns off and SCR1 turns on, cutting output power. Power supply must be turned off to unlatch SCR1. For over-voltage shutdown, CR2 starts conducting above 16 V, turning on SCR2 and activating relay K1 to cut off main DC supply. Article gives construction details. T1 has 22-V secondary.-C. C. Lo, 500-Watt Regulated Power Supply, Ham Radio, Dec. 1977, p 30-32.



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