公开(公告)号：US09835670B2

公开(公告)日：2017-12-05

申请号：US15167022

申请日：2016-05-27

Applicant: Renesas Electronics Corporation

Inventor： Hirokazu Nagase

IPC: G01R31/00 ,  G01R31/02 ,  G01R31/12 ,  H03K17/687

CPC classification number: G01R31/025 ,  G01R31/1263 ,  H03K17/687

Abstract: An isolator includes: a transmission circuit that generates an alternating current transmission signal in which a first potential is set to be a reference potential; a first insulating element to which the alternating current transmission signal is supplied; a second insulating element that generates an alternating current reception signal in which a second potential is set to be a reference potential by being alternating current-coupled to the first insulating element through an insulating film; a reception circuit that reproduces reception data based on the alternating current reception signal; an impedance control unit that controls an impedance of the first or the second insulating element to be higher than an impedance before the control; and a leakage current detection unit that detects a leakage current flowing between the first and the second insulating elements through the first or the second insulating element in which the impedance has been controlled.