Patent · US Expired

Optocoupler for power FET

US4859875A · kind A · utility

12Cited by

8References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Jenoe Tihanyi · Tauberbischofsheim, DE
Roland Weber · Munich, DE

Key dates

Filing date	Aug 24, 1988
Grant date	Aug 22, 1989
Priority date	—
Expiry date	Aug 24, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH03K17/785
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A power FET is driven by a photodiode chain across a switch, which has two FETs (5, 6) arranged in series. Upon illumination the first FET (5) is driven to be conducting, which permits current to flow from a capacitor (C) connected to a fixed voltage into the gate-source capacitor (C.sub.GS) of the power FET (1) and to switch it on rapidly. Upon cessation of the illumination, the first FET (5) is blocked while the second FET (6) is driven to be conducting. Hence, the C.sub.GS of the power FET is discharged and the power FET is blocked.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.