Patent ID: 7026796
Filing Date: 2006-04-11
Classification: H02M,Y02B

Abstract:
1. A booster circuit wherein energy is stored in an inductor when a switching element is on and said energy is superposed onto an input voltage to charge a capacitor disposed at an output side when said switching element is off, the booster circuit comprising: a detecting means detecting said input voltage and an actual booster voltage on said capacitor side; a target booster setting means setting a target booster voltage; a duty ratio setting means comprising an A/D converter, said duty ratio setting means performing proportion, integration and differentiation operations to calculate a control value for the switching element and setting a duty ratio corresponding to said control value so that deviation between said target booster voltage and said actual booster voltage is eliminated; and a controlling means calculating a correction value based on an input voltage change obtained from said input voltage, correcting said duty ratio with said correction value, and performing feedback control based on said corrected duty ratio by turning said switching element on and off.