Aparelho e processo de controle de temperatura para executar controle de operacao

Temperature control apparatus for use e.g. in an air conditioner, utilises a thermistor (21) as a temperature detection device. The thermistor has a non-linear temperature/voltage characteristic which is compensated for, by means of a processor (14). The voltage output developed across the thermisto...

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Bibliographic Details
Main Author HISASHI TOKIZAKI
Format Patent
LanguagePortuguese
Published 29.03.1994
Edition5
Subjects
AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING
BLASTING
COMBINED HEATING AND REFRIGERATION SYSTEMS
CONTROLLING
HEAT PUMP SYSTEMS
HEATING
LIGHTING
LIQUEFACTION SOLIDIFICATION OF GASES
MANUFACTURE OR STORAGE OF ICE
MEASURING
MEASURING QUANTITY OF HEAT
MEASURING TEMPERATURE
MECHANICAL ENGINEERING
PHYSICS
RANGES
REFRIGERATION MACHINES, PLANTS OR SYSTEMS
REFRIGERATION OR COOLING
REGULATING
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
TESTING
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
VENTILATING
WEAPONS
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Summary:Temperature control apparatus for use e.g. in an air conditioner, utilises a thermistor (21) as a temperature detection device. The thermistor has a non-linear temperature/voltage characteristic which is compensated for, by means of a processor (14). The voltage output developed across the thermistor (21) is converted to digital form, and the processor (14) is pre-programmed with data concerning the non-linear relationship of the detector impedance versus temperature, which is used to compensate for the non-linearity of the thermistor. The stored relationship is of the form where x is the impedance value, a is a constant, and t is the temperature, n being an integer; for example n = 3. As a result, the thermistor can be used over a much larger sensing range than hitherto.
Bibliography:Application Number: BR19939303819