CA2229419A1 - Electronic thermostat control unit and its use in multi-point temperature controller for refrigeration and heating systems - Google Patents

Electronic thermostat control unit and its use in multi-point temperature controller for refrigeration and heating systems

Info

Publication number
CA2229419A1
CA2229419A1 CA2229419A CA2229419A CA2229419A1 CA 2229419 A1 CA2229419 A1 CA 2229419A1 CA 2229419 A CA2229419 A CA 2229419A CA 2229419 A CA2229419 A CA 2229419A CA 2229419 A1 CA2229419 A1 CA 2229419A1
Authority
CA
Canada
Prior art keywords
digital
circuit
refrigeration
electronic
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2229419A
Other languages
French (fr)
Other versions
CA2229419C (en
Inventor
Rajiv Bhatnagar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vasu Tech Ltd
Original Assignee
Varma Trafag Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IN615BO1997 external-priority patent/IN187280B/en
Priority claimed from IN616BO1997 external-priority patent/IN187286B/en
Application filed by Varma Trafag Ltd filed Critical Varma Trafag Ltd
Publication of CA2229419A1 publication Critical patent/CA2229419A1/en
Application granted granted Critical
Publication of CA2229419C publication Critical patent/CA2229419C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G05D23/1934—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices

Abstract

This invention relates to an electronic digital thermostat consisting of a single p-n junction as the temperature sensing element connected to an A-D converter, a sensitivity and Offset Correction circuit, digital comparators, digital noise filters, a control latch, an output drive and protection circuit and a solid-state switch to produce the desired output, with user input in either analogue form using a potentiometer or digital form using a switch, with calibration and control data stored in nonvolatile memory, and a display unit for displaying sensed or user-set temperature. This invention further relates to the application of the said electronic digital thermostat in a multipoint temperature controller for Refrigeration and Heating systems, using a plurality of the said electronic thermostat control units with a logic circuit, Central Control Unit, System Timers, and a Starting Relay circuit to provide application-specific functions. The implementation is also shown in the form of an Application Specific Integrated Circuit (ASIC) to provide reduced size and cost <IMAGE>
CA002229419A 1997-10-16 1998-02-13 Electronic thermostat control unit and its use in multi-point temperature controller for refrigeration and heating systems Expired - Fee Related CA2229419C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
IN616/BOM/97 1997-10-16
IN615BO1997 IN187280B (en) 1997-10-16 1997-10-16
IN615/BOM/97 1997-10-16
IN616BO1997 IN187286B (en) 1997-10-16 1997-10-16
EP97310174A EP0924588A1 (en) 1997-10-16 1997-12-16 Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems
EP98303413A EP0927919B1 (en) 1997-10-16 1998-04-30 Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems

Publications (2)

Publication Number Publication Date
CA2229419A1 true CA2229419A1 (en) 1999-04-16
CA2229419C CA2229419C (en) 2000-12-26

Family

ID=27443570

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002229419A Expired - Fee Related CA2229419C (en) 1997-10-16 1998-02-13 Electronic thermostat control unit and its use in multi-point temperature controller for refrigeration and heating systems

Country Status (16)

Country Link
US (1) US6006996A (en)
EP (2) EP0924588A1 (en)
JP (1) JP2975958B2 (en)
AT (1) ATE194429T1 (en)
AU (1) AU708566B2 (en)
BR (1) BR9803927A (en)
CA (1) CA2229419C (en)
DE (1) DE69800200T2 (en)
DK (1) DK0927919T3 (en)
ES (1) ES2150304T3 (en)
HK (1) HK1021034A1 (en)
MX (1) MXPA98008534A (en)
PL (1) PL187520B1 (en)
RU (1) RU2156495C2 (en)
SG (1) SG77625A1 (en)
TW (1) TW432263B (en)

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IES20010192A2 (en) * 2000-03-01 2001-09-19 Frank Poucher An Integrated Circuit Chip for use as an Electronic Thermostat
AU7174700A (en) * 2000-05-04 2001-11-08 Vasu Tech Limited Configurable electronic controller
US6595430B1 (en) * 2000-10-26 2003-07-22 Honeywell International Inc. Graphical user interface system for a thermal comfort controller
KR100385577B1 (en) * 2000-12-07 2003-05-27 신성전자공업 주식회사 Temperature control-test device and its temperature control mode using thermoelement
AUPR227300A0 (en) * 2000-12-22 2001-01-25 Mistral International Pty Ltd Temperature probe controller circuit
US6506236B2 (en) 2001-03-28 2003-01-14 Air Products And Chemicals, Inc. Process for reducing the level of carbon dioxide in a gaseous mixture
US6691923B2 (en) 2001-05-31 2004-02-17 Goodrich Corporation Low noise solid-state thermostat
KR100474347B1 (en) * 2002-10-25 2005-03-08 엘지전자 주식회사 Driving apparatus for reciprocating compressor
US6742716B1 (en) 2003-02-28 2004-06-01 Standard-Thomson Corporation Thermostat
US6764020B1 (en) 2003-02-28 2004-07-20 Standard-Thomson Corporation Thermostat apparatus for use with temperature control system
CN1296788C (en) * 2003-03-16 2007-01-24 华为技术有限公司 Temperature controlling system
US7104462B2 (en) * 2004-01-09 2006-09-12 Goodrich Corporation Low noise solid-state thermostat with microprocessor controlled fault detection and reporting, and programmable set points
EP1708067A1 (en) * 2005-03-23 2006-10-04 Technotrans AG Method of manufacturing a system for the measurement of temperature and a temperature measurement system made according to this method.
US7524107B1 (en) * 2006-09-29 2009-04-28 National Semiconductor Corporation Dual purpose output thermostat
US20080159352A1 (en) * 2006-12-27 2008-07-03 Dhananjay Adhikari Temperature calculation based on non-uniform leakage power
JP5286838B2 (en) * 2008-03-10 2013-09-11 沖電気工業株式会社 Sensor output filtering device
US9003820B2 (en) 2010-04-20 2015-04-14 Prince Castle LLC Point-of-use holding cabinet
US8607587B2 (en) 2010-05-19 2013-12-17 Prince Castle LLC Refrigerated point-of-use holding cabinet
US8799698B2 (en) * 2011-05-31 2014-08-05 Ericsson Modems Sa Control of digital voltage and frequency scaling operating points
US9046899B2 (en) 2011-11-01 2015-06-02 Goodrich Corporation Aircraft heating system
WO2014185949A1 (en) * 2013-05-17 2014-11-20 Intel Corporation On-chip supply generator using dynamic circuit reference
CN103455058B (en) * 2013-08-28 2015-10-14 湖南科技学院 A kind of Inner eycle constant temperature system
RU2571728C1 (en) * 2014-12-22 2015-12-20 АО "Научно-исследовательский институт электромеханики" (АО "НИИЭМ") Control over spacecraft hardware heaters
CN104698941A (en) * 2015-03-11 2015-06-10 南京大全自动化科技有限公司 FPGA-based (field programmable gate array-based) embedded dual-core relay protecting system
US10501972B2 (en) * 2015-03-31 2019-12-10 Follett Corporation Refrigeration system and control system therefor
JP6623306B2 (en) * 2015-11-16 2019-12-18 モレックス エルエルシー Power charging module and method of using the same
US9980322B1 (en) 2016-04-19 2018-05-22 Prince Castle LLC Multi-zone food holding bin
USD809326S1 (en) 2016-04-19 2018-02-06 Prince Castle LLC Food holding bin
US9976750B1 (en) 2016-04-20 2018-05-22 Prince Castle LLC Multi-zone food holding bin
JP2019047173A (en) * 2017-08-30 2019-03-22 ルネサスエレクトロニクス株式会社 Semiconductor device, signal processing system, and signal processing method
RU2681385C1 (en) * 2017-12-20 2019-03-06 Юрий Николаевич Черкасов Temperature in the spatially distributed climatic chambers control device
US11828535B2 (en) 2018-06-29 2023-11-28 Universiteit Gent Freezing, drying and/or freeze-drying of product dose units
CN111929573A (en) * 2020-07-27 2020-11-13 中核核电运行管理有限公司 Thermal relay automatic check meter in constant temperature environment
RU208960U1 (en) * 2021-06-22 2022-01-24 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
CN113359899B (en) * 2021-06-26 2022-06-24 左点实业（湖北）有限公司 Temperature control method and device for foot bath barrel

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Also Published As

Publication number Publication date
BR9803927A (en) 1999-11-23
ATE194429T1 (en) 2000-07-15
DK0927919T3 (en) 2000-09-25
EP0924588A1 (en) 1999-06-23
EP0927919A1 (en) 1999-07-07
MXPA98008534A (en) 2004-08-24
AU8191098A (en) 1999-05-06
JPH11143552A (en) 1999-05-28
AU708566B2 (en) 1999-08-05
EP0927919B1 (en) 2000-07-05
CA2229419C (en) 2000-12-26
PL187520B1 (en) 2004-07-30
DE69800200D1 (en) 2000-08-10
SG77625A1 (en) 2001-01-16
ES2150304T3 (en) 2000-11-16
PL328682A1 (en) 1999-04-26
US6006996A (en) 1999-12-28
RU2156495C2 (en) 2000-09-20
DE69800200T2 (en) 2001-03-08
JP2975958B2 (en) 1999-11-10
TW432263B (en) 2001-05-01
HK1021034A1 (en) 2000-05-26

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