Circuit for limiting the maximum current value supplied to a loa

Details Circuit for limiting the maximum current value supplied to a loa Circuit for limiting the maximum current value supplied to a loa

1996-03-14

1996-11-26

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327325, 327365, H03K 508

Patent

active

055789560

ABSTRACT:
The invention concerns a circuit for limiting the maximum current to be supplied to a load through a power MOS, being an improvement of the limiting circuitry which uses an equalizing capacitor. The addition of circuitry with a one-way current flow between a terminal of the equalizing capacitor and the gate terminal of the power MOS is effective to lower the voltage across the capacitor and to speed up its charging process, thereby making the current limiting action expected from the circuit a timely one. The circuitry which limits current flow to one direction may include a second MOS of the same type as the power MOS. In this way, any deviations of the power MOS from its designed operation, e.g. due to its manufacturing process variation and thermal drift phenomena, can also be compensated.

REFERENCES:
patent: 4777387 (1988-10-01), Collins
patent: 4833342 (1989-05-01), Kiryv et al.

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