The poly output direct voltage source devices null which use cross regulation

摘要

PURPOSE: To suppress ripple voltage for a specific output voltage through a choke coil and a smoothing capacitor by employing a common core for first and second choke coils having number of turns satisfying a specific formula. ;CONSTITUTION: A common core(not shown) is employed for first and second choke coils L₁, L₂ having numbers of turns(n21' and n22') satisfying the following formula. n21'/n22'=(n21/n22)/α or n21'/n22'=(n22/n21)/αo, where, n21 and n22 are the numbers of turns of primary and secondary windings of a transformer T and α is the coupling factor of cross regulation choke. When the ripple voltages in the first and second output voltages are nullified in the calculation by modifying the turn ratio of a cross regulation choke, upper or lower formula is employed, respectively. According to the invention, ripple voltage in specific output voltage can be suppressed.;COPYRIGHT: (C)1993,JPO&Japio