公开(公告)号：SG130957A1

公开(公告)日：2007-04-26

申请号：SG2005059548

申请日：2005-09-15

Applicant: ST MICROELECTRONICS ASIA

Inventor： TAT CHUAH YEW ,  TECK TEO KIAN

Abstract: The electrical isolation circuit of the present invention has a switch coupled between the DC power source and the electrical application and a comparator for controlling the switch by receiving inputs from the DC power source and the electrical application. The comparator causes the switch to switch ON when the DC power source has a higher voltage than the electrical application allowing the normal operation of the electrical application. However, when the electrical application has a higher voltage than the DC power source, the comparator causes the switch to switch OFF thereby preventing flow of current from the electrical application to the DC power source.