Two stage protection circuit for a power MOSFET driving an induc

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

361 33, 361111, H02H 300

Patent

active

048601527

ABSTRACT:
A snubber circuit comprising two stages regulates the gate current of a MOSFET in relation to the drain voltage at turnoff to clamp transient inductive voltages to a nondestructive level. At the onset of the turnoff, a current source is activated to discharge the gate capacitance, and the snubber controls the magnitude of such current in relation to the sensed drain voltage to stabilize the drain voltage at a nondestructive level. When the drain voltage approaches its limit value, a current injection circuit supplies additional current to the gate to sustain the MOSFET conduction, again in relation to the sensed drain voltage. When the inductive energy stored in the load is substantially dissipated, the drain voltage falls; at such point, the current injection circuit is disabled and the conduction of the current source is increased to complete the turnoff of the MOSFET.

REFERENCES:
patent: 4679112 (1987-07-01), Craig
patent: 4691263 (1987-09-01), Kenny et al.
patent: 4745510 (1988-05-01), McMurray
patent: 4752852 (1988-06-01), Agi et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Two stage protection circuit for a power MOSFET driving an induc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Two stage protection circuit for a power MOSFET driving an induc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two stage protection circuit for a power MOSFET driving an induc will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2420138

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.