Basic Theory and Design of Electronically Regulated Power Supplies

Various types of electronic regulator circuits are discussed and an analysis is made of the degenerative or cathode-follower type, since it offers the most in flexibility and regulation. Equations are derived showing the theoretical output voltage, regulation characteristics, and output impedance for the basic circuit. Practical-design considerations evolved from these equations show the desirability of high-transconductance series-control tubes and high gain in the amplifier section. A complete circuit is presented for a multiple-output regulator which, by combining regulated sections in opposition, covers the range from 0 to 500 volts. The design is such that a single rectifier and filter are supplying constant current throughout the selected range of output current. This effectively eliminates from consideration the usual regulation introduced by the latter components. Curves are included showing actual regulation characteristics for several combinations of output voltage and current.