Automotive Lead-Acid Battery Supplied DC-DC Power Converter with Variable Output Voltage

This article presents how one can supply equipment which requires a regulated output and low ripple voltage such as HAM radios, which require a regulated 13.7V, by using a switch mode DC\DC converter powered up from an automotive battery. Car batteries can output 11.31V to 12.7V in normal state and cannot be fed to HAM radio equipment since they require 13.7V. Specially designed switch mode DC/DC converters with super low current and voltage ripple are required to supply them.