Electrical resistors – Resistance value temperature-compensated – With additional compensating resistor or resistance element
Patent
1992-06-25
1993-09-28
Lateef, Marvin M.
Electrical resistors
Resistance value temperature-compensated
With additional compensating resistor or resistance element
338 22R, H01C 706
Patent
active
052489558
ABSTRACT:
In many cases, the influence of temperature on the quality of a coil has a disturbing effect. Therefore, a coil inductance is produced such that the influence of temperature on the quality of the coil is substantially compensated for in a particular range of the system frequency. To this end, a second coil having a second quality value Q2 is magnetically coupled in series to a first coil having a first quality value Q1. Moreover, the two coils are selected in such a way that for a particular range of the system frequency f, the quality value Q1 decreases as the temperature T increases and the quality value Q2 increases as the temperature T increases. A coil conductor for the first coil made of litz wire and a coil conductor for the second coil made of solid wire may be used to create such a temperature dependence.
REFERENCES:
patent: 381304 (1888-04-01), Weston
patent: 3694785 (1972-09-01), Chass
patent: 4117371 (1978-09-01), Van Vliet et al.
patent: 4236410 (1980-12-01), Appel et al.
patent: 4989460 (1991-02-01), Mizuno et al.
patent: 5043661 (1991-08-01), Dobey
patent: 5089930 (1992-02-01), Chass
Lateef Marvin M.
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