Patent ID: 8054654

Claim:
An electrically insulated switching element driver, comprising: a first pulse transformer; a second pulse transformer; a duty signal generator that generates a duty signal having a predetermined duty ratio; a pulse transformer driving unit into which a switching element driving signal and the duty signal are input, and which, in accordance with the duty signal, drives one of the first pulse transformer and the second pulse transformer that is selected depending on a state of the switching element driving signal; and a first edge detection unit, a second edge detection unit, and a control driving unit that operate with power resulting from rectifying the output of the first pulse transformer and the second pulse transformer, wherein the first edge detection unit outputs an on-off signal according to an edge in a pre-rectification output of the first pulse transformer; the second edge detection unit outputs an on-off signal according to an edge in a pre-rectification output of the second pulse transformer; and the control driving unit drives a switching element to be driven, on the basis of the output of the first edge detection unit and the second edge detection unit.