SWITCHING POWER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To solve a problem in a DC/DC converter that when a relation between its duty ratio and its booster rate becomes nonlinear and, its current causes a vibration when the load current changes suddenly. SOLUTION: A first duty ratioα1 is obtained according to a detected output voltage of the DC/DC converter. The first duty ratioα1 is converted to a corrected second duty ratioα2 for correcting its nonlinear form. A PWM pulse is formed according to the second duty ratioα2, and the switch are on-off controlled.