Self-powered SCR gate drive circuit with optical isolation

Details Self-powered SCR gate drive circuit with optical isolation Self-powered SCR gate drive circuit with optical isolation

1989-10-18

1991-07-02

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307311, 307638, H03K 1772

Patent

active

050288253

ABSTRACT:
The improved gate drive circuit provides a continuous gate current whenever there is sufficient anode-to-cathode voltage difference across the SCR. This approach described herein eliminates the need to monitor and reapply SCR gate current after each commutation due to load current distortions. Previous SCR gate driver designs used a pulse train of gate currents to provide a means of keeping the SCRs turned on. The pulsed gate control approach has gaps in the SCR's operation and requires significant circuitry that dissipates much more drive energy. Energy for this improved driver circuit is derived from the SCR anode-to-cathode voltage differential. This eliminates the need for individual power supplies to provide isolated gate signals for each SCR. This self-powering feature reduces the intricacy of controlling multiple SCRs in multi-phase or unreferenced power systems. Flexibility provided by this method allows high power SCRs to be directly interfaced to a digital processor-type controller.

REFERENCES:
patent: 3766409 (1973-10-01), Shuey
patent: 4217618 (1980-08-01), Kellenbenz et al.
patent: 4363064 (1982-12-01), Billings et al.
patent: 4413193 (1983-11-01), Crockett
patent: 4554463 (1985-11-01), Norbeck et al.

Affiliated with

Also associated with

Rating

Self-powered SCR gate drive circuit with optical isolation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Self-powered SCR gate drive circuit with optical isolation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-powered SCR gate drive circuit with optical isolation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1249243