Temperature compensation circuit for semiconductor switch and me

Details Temperature compensation circuit for semiconductor switch and me Temperature compensation circuit for semiconductor switch and me

1998-10-05

2000-12-19

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327378, 323907, H03K 1778

Patent

active

061632023

ABSTRACT:
For use with a semiconductor switch that exhibits a temperature-dependent electrical characteristic and a current sense circuit that employs the characteristic of the switch to derive a switch current signal, a temperature compensation circuit, method of operation thereof and controller employing the same. In one embodiment, the circuit includes: (1) an electrical component, locatable in thermal communication with the switch and having a temperature-dependent electrical characteristic that bears an inverse relationship to the characteristic of the switch, that generates an intermediate signal based on an actual temperature of the switch and (2) a signal conditioning circuit, coupled to the electrical component, that scales the intermediate signal to yield a compensation signal that counteracts temperature-dependent variations in the switch current signal.

REFERENCES:
patent: 3763440 (1973-10-01), Garcia et al.
patent: 5021679 (1991-06-01), Fairbanks et al.
patent: 5132564 (1992-07-01), Fletcher et al.
patent: 5796309 (1998-08-01), Nguyen
patent: 5939863 (1999-08-01), Miller
Bob Mammano; "Current Sensing Solutions for Power Supply Designers"; 1997 Unitrode Power Supply Design Seminar; pp. 1-1 thru 1-34.

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