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This article describes a device for monitoring the temperature of two TCMs by means of a microprocessor interface. The invention provides an accurate monitoring system using no precise voltage reference.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
82% of the total text.
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Accurate Digital Thermal Monitoring System
This article describes a device for monitoring the temperature of two TCMs
by means of a microprocessor interface. The invention provides an accurate
monitoring system using no precise voltage reference.
With respect to the figure, the invention includes a dividing bridge made of a
very accurate resistor R and the thermal resistors Rth1 and Rth2. The voltage of
this bridge V1 is transformed with a resistor R1 in current I1: Vref. Rth V1 =
___________ Rth + R Vref. Rth 1 I1 = (__________ ) . ___ Rth + R R1
This current is compared with the output current, I2 of a
digital- to-analog converter (DAC) (8 bits, for instance). 8 Ci
Vref I2 = K S ____ with K = ______ i=1 2i
R3 where Vref is the voltage reference for the DAC and R3
the resistor which guarantees the maximal output current.
The comparator changes its status when: I1 = I2 Vref Rth 1
Vref 8 Ci (__________) ____ = ______ ( S ____) Rth + R R1 R3 i=1 2i Rth R1 8 Ci <===> _________ = ____ S ____ Rth + R R3 i=1 2i Rth 8 Ci if R1 = R3 ===>
_________ = S ____ Rth + R i=1 2i
Thus, the accuracy of the system depends on the accuracy of the bridge
resistor and the accuracy of the DAC conversion; no voltage reference is
When the comparator changes its status, a positive front appears on its
output which clocks the status at the input DAC counter into an 8-bit 3-state
latch. The status of the latch is refreshed every 256 counter clock pulse cycle.