Abstract
The root mean square (rms) measurement
of alternating voltage of any waveform is frequently done
by means of thermal transfer instruments. The principle of
these thermal rms converters is to transfer the heating
energy of resistive load to a temperature-sensing element.
The dc voltage output of the sensor reflects the amount of
electrical power (ac or dc) applied to the input. This paper
is addressing the modelling of a thermal converter device
in planar technology using finite element platform. The
original approach of this study capitalizes on introduction
of a resistive thermal sensing element of a planar type to
provision the thermal-conversion response to the active
power dissipated on the 3D stratified non-reactive heater
structure. Through iterative multi-physics simulations,
model properties and dimensions have been evaluated and
optimized.