Electrical resistors – Resistance value temperature-compensated – With additional compensating resistor or resistance element
Patent
1992-06-19
1993-08-24
Lateef, Marvin M.
Electrical resistors
Resistance value temperature-compensated
With additional compensating resistor or resistance element
338 22R, H61C 706
Patent
active
052392830
ABSTRACT:
To compensate for the temperature dependence of a resonant circuit, it is known to use an a.c. current source, with which the resonant circuit is excited in dependence upon the ohmic resistance of the coil conductor material. The task of compensating for temperature may to be solved without a costly closed-loop control process and with few losses. A magnetically coupled second coil is connected in parallel with the first coil to be compensated, and an NTC thermistor is connected in series with one of the two coils so that the series connection is connected in parallel with the other of the two coils. The NTC thermistor is selected so that, in conjunction with the two variable sized ohmic resistors of the two coils, the circuit arrangement has a specified total ohmic resistance, which is substantially independent of temperature.
REFERENCES:
patent: 381304 (1888-04-01), Weston
patent: 1094733 (1914-04-01), Lyle
patent: 1884877 (1932-10-01), Rypinski
patent: 2769092 (1956-10-01), Pruitt
patent: 3577209 (1971-05-01), Perkins
patent: 4117371 (1978-09-01), Van Vliet et al.
Lateef Marvin M.
Siemens Aktiengesellschaft
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