Light controllable thyristor
US4001865A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Nov 14, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F30/263
Abstract
A thyristor which may be controlled by light has a semiconductor body comprising at least four zones of alternating conductivity types. The first zone forms a main emitter, the second zone forms a base having a region which is provided to be exposed to light, and having an auxiliary emitter located between the light region and the main emitter. A second auxiliary emitter is located between the first-mentioned auxiliary emitter and the main emitter. The ratio of the effective edge lengths facing the exposure region, to the second auxiliary emitter and the ratio between the effective edge lengths facing the exposure region of the main emitter on the one hand and the second auxiliary emitter on the other hand are related to one another in such a manner that, prior to the turn-on of the first auxiliary emitter, the second auxiliary emitter and subsequently the main emitter turn on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.