Silicon controlled rectifier with a variable base-shunt resistan

Details Silicon controlled rectifier with a variable base-shunt resistan Silicon controlled rectifier with a variable base-shunt resistan

1993-08-23

1995-08-29

Hille, Rolf

Active solid-state devices (e.g., transistors, solid-state diode

Regenerative type switching device

With light activation

257122, 257124, 257154, 257162, H01L 2974

Patent

active

054462959

ABSTRACT:
An optically triggered silicon controlled rectifier (SCR) circuit (20) has a number of semiconductor layers diffused into an N- substrate (21). The layers form an SCR (50) having a P+ anode region (25), a P+ gate region (24), and an N+ cathode region (27). An adjustable base-shunt resistance, in the form of a P- channel depletion mode MOSFET (Q3), connects between the SCR gate region and the cathode region. The MOSFET includes a MOSFET gate region (35), a P+ drain region (24), a P-- channel (26), and a P+ source region (23). The substrate also accommodates a PN photodiode (22, D1) which connects to the MOSFET gate region for switching the MOSFET on and off in response to incident optical radiation (L) thereon. The SCR gate region also comprises photosensitive material. When sufficient optical radiation illuminates the photodiode and the SCR gate region, the MOSFET is turned off and the SCR is triggered, permitting anode-to-cathode current to flow. When insufficient optical radiation is present, the MOSFET is turned on and provides a low-resistance shunt path which prevents the SCR gate region from triggering the SCR.

REFERENCES:
patent: 4489340 (1984-12-01), Ueda et al.
patent: 4604638 (1986-08-01), Matsuda
patent: 4717947 (1988-01-01), Matsuda et al.
patent: 4947226 (1990-08-01), Huang et al.

Affiliated with

Also associated with

Rating

Silicon controlled rectifier with a variable base-shunt resistan does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Silicon controlled rectifier with a variable base-shunt resistan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silicon controlled rectifier with a variable base-shunt resistan will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1821368