| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC converter that can reduce the switching loss and switching noise in all the states, covering a constant state and a transitional state. <P>SOLUTION: The DC converter comprises a time difference detection circuit 13 that detects the time difference between the turning-off of an auxiliary switch Q2 and the turning-on of a main switch Q1 from the vicinity of a minimum voltage of the main switch Q1, after the turning-off of the auxiliary switch; an integration circuit 20 that integrates the output of the time difference detection circuit 13; and a first delay circuit 14 that delay-controls the on-time of the main switch Q1, on the basis of an output of the integration circuit 20 and the output of the time difference detection circuit 13. The first delay circuit 14 controls the output of the time difference detection circuit 13 so as to be reduced, on the basis of the output of the integration circuit 20, and controls the on-time of the main switch Q1 in a manner of pulse-by-pulse, by using a pulse-by-pulse control signal that is based on the output of the time difference detection circuit 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
