Voltage detection circuit and internal voltage clamp circuit

Details Voltage detection circuit and internal voltage clamp circuit Voltage detection circuit and internal voltage clamp circuit

1997-03-31

1998-12-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327 54, 327309, H03K 508

Patent

active

058475915

ABSTRACT:
The voltage detection and control circuit includes a voltage detect circuit having an associated switch point greater than a first predetermined voltage, with the voltage detect circuit being responsive to an input voltage greater than the first predetermined voltage for generating an activation signal; and a clamp control circuit, responsive to the activation signal, for clamping an operating voltage to a second predetermined voltage. The second predetermined voltage may be substantially equal to the first predetermined voltage. A spike filter may be included for suppressing spikes in the activation signal. A clamp stage control circuit is provided for suppressing oscillations in the second predetermined voltage. At least one clamp stage, which may include a delay device, provides the operating voltage to a corresponding circuit component as well as reducing current peaks in the corresponding circuit component. The voltage detect circuit may include a current mirror, responsive to a first current generated from the input voltage, for generating a second current substantially equal to the first current for generating the activation signal.

REFERENCES:
patent: 4617473 (1986-10-01), Bingham
patent: 5063304 (1991-11-01), Iyengar
patent: 5300824 (1994-04-01), Iyengar
patent: 5532635 (1996-07-01), Watrous et al.
patent: 5561391 (1996-10-01), Wellnitz et al.
patent: 5604457 (1997-02-01), Ting

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