Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1994-09-20
1995-08-22
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219497, 219501, 219508, 219504, 338314, 338225D, 327512, H05B 102, H03K 3295
Patent
active
054442192
ABSTRACT:
A semiconductor body (10) has a first region (13) of one formed a semiconductor device (Rx) having a resistance which varies with temperature. The semiconductor device (Rx) is formed by a second region (14) of the opposite conductivity type formed within the first region (13) and a third region (15) of the one conductivity type formed within the second region (14), with first and second electrodes (16) and (17) being spaced apart on the third region (15) so that a resistive path is provided by the third region (15) between the first and second electrodes (16 and 17) and a reference electrode (18) connecting the second region (14) to a reference potential. The impurity concentrations within the second and third regions (14 and 15) are such that the semiconductor device (Rx) has a temperature coefficient of resistance which changes, generally increases or falls only slightly, with absolute temperature such that the relative temperature coefficient of resistance referred to the sensed temperature is substantially constant. Respective temperature sensing devices may be provided adjacent to and remote from an active semiconductor device to provide a differential temperature sensor.
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Biren Steven R.
Paschall Mark H.
U.S. Philips Corporation
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