Circuit for monitoring temperature of high-voltage equipment
- Chillicothe, OH
This invention relates to an improved circuit for measuring temperature in a region at high electric potential and generating a read-out of the same in a region at lower potential. The circuit is specially designed to combine high sensitivity, stability, and accuracy. A major portion of the circuit situated in the high-potential region can take the form of an integrated circuit. The preferred form of the circuit includes an input section which is situated in the high-potential region and comprises a temperature-compensated thermocouple circuit for sensing temperature, an oscillator circuit for generating a train of ramp voltages whose rise time varies inversely with the thermocouple output, a comparator and switching circuit for converting the oscillator output to pulses whose frequency is proportional to the thermocouple output, and a light-emitting diode which is energized by these pulses. An optical coupling transmits the light pulses generated by the diode to an output section of the circuit, situated in a region at ground. The output section comprises means for converting the transmitted pulses to electrical pulses of corresponding frequency, means for amplifying the electrical pulses, and means for displaying the frequency of the same. The preferred embodiment of the overall circuit is designed so that the frequency of the output signal in hertz and tenths of hertz is equal to the sensed temperature in degrees and tenths of degrees.
- Research Organization:
- Goodyear Atomic Corp., Piketon, Ohio
- DOE Contract Number:
- AT(33-2)-1
- Assignee:
- United States of America as represented by United States Energy (Washington, DC)
- Patent Number(s):
- US 3978729
- OSTI ID:
- 862630
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
monitoring
temperature
high-voltage
equipment
relates
improved
measuring
region
electric
potential
generating
read-out
specially
designed
combine
sensitivity
stability
accuracy
major
portion
situated
high-potential
form
integrated
preferred
input
section
comprises
temperature-compensated
thermocouple
sensing
oscillator
train
ramp
voltages
rise
time
varies
inversely
output
comparator
switching
converting
pulses
frequency
proportional
light-emitting
diode
energized
optical
coupling
transmits
light
generated
ground
means
transmitted
electrical
corresponding
amplifying
displaying
embodiment
overall
signal
hertz
tenths
equal
sensed
degrees
oscillator circuit
emitting diode
measuring temperature
light-emitting diode
specially designed
light pulses
preferred embodiment
output signal
integrated circuit
electric potential
major portion
preferred form
electrical pulses
switching circuit
comprises means
light pulse
rise time
pulses generated
transmitted pulse
overall circuit
optical coupling
electrical pulse
oscillator output
monitoring temperature
improved circuit
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