Negative voltage clamp circuit for controlling currents in induc

Details Negative voltage clamp circuit for controlling currents in induc Negative voltage clamp circuit for controlling currents in induc

1991-12-05

1992-07-28

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361159, 361205, 318434, 323268, 323287, G05F 1563, G05F 159

Patent

active

051345374

ABSTRACT:
A circuit capable of driving inductive loads below a chip substrate voltage level while minimizing on-chip power dissipation and eliminating parasitic effects. Two negative voltage drive modes are included in the circuit design. The first drive circuit forces a low negative voltage referenced to the circuit output voltage across an inductive load referenced to ground to provide a slow recirculation of the current in the inductive load. The second drive circuit forces a large negative voltage referenced to the circuit output voltage across the inductive load to provide a fast collapse of the inductive load. The switching regulator switches off when the current to the inductive load reaches a first value and switches on when the recirculating current from back e.m.f. reaches a second value. The switching regulator initially provides a higher level of power when first tuned on.

REFERENCES:
patent: 4446410 (1984-05-01), Yagura et al.
patent: 4605983 (1986-08-01), Harvey
patent: 4680667 (1987-07-01), Petrie
patent: 4949215 (1990-08-01), Studtmann et al.
patent: 4967309 (1990-10-01), Hoffman
patent: 4980793 (1990-12-01), Glowczewski et al.

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