CA2076804A1 - Electronic automatic temperature control - Google Patents

Electronic automatic temperature control

Info

Publication number
CA2076804A1
CA2076804A1 CA2076804A CA2076804A CA2076804A1 CA 2076804 A1 CA2076804 A1 CA 2076804A1 CA 2076804 A CA2076804 A CA 2076804A CA 2076804 A CA2076804 A CA 2076804A CA 2076804 A1 CA2076804 A1 CA 2076804A1
Authority
CA
Canada
Prior art keywords
temperature
power
scr
thermal load
source
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
CA2076804A
Other languages
French (fr)
Other versions
CA2076804C (en
Inventor
Robert C. Griffith
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.)
EDSYN Inc
Original Assignee
Robert C. Griffith
Edsyn, Inc.
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
Application filed by Robert C. Griffith, Edsyn, Inc. filed Critical Robert C. Griffith
Publication of CA2076804A1 publication Critical patent/CA2076804A1/en
Application granted granted Critical
Publication of CA2076804C publication Critical patent/CA2076804C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/02—Soldering irons; Bits
    • B23K3/03—Soldering irons; Bits electrically heated
    • B23K3/033—Soldering irons; Bits electrically heated comprising means for controlling or selecting the temperature or power
    • 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
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1913—Control of temperature characterised by the use of electric means using an analogue comparing device delivering a series of pulses
    • 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

Abstract

A temperature control circuit is disclosed utilizing automatically either the electric heating (or cooling) element or a separate sensor to measure the instantaneous temperature of a thermal load device (40).
Either a pulsating de or an ac electric power source (16) may be used with the temperature sensing occurring at near-zero points of the source voltage waveform. The sensor (68) forms one element of a Wheatstone bridge (90) which when unbalanced by a value lower than a chosen reference value, causes a monostable oscillator (70) to flip for at least several cycles of the source power.
This turns on a power SCR (42) to feed electric current to the thermal load to increase its temperature (and resistance) until the bridge is again balanced to reverse the state of the monostable oscillator and turn off the SCR. A simple, reliable two step, user friendly calibration circuit is provided for the temperature selecting component. For multiple channel applications the circuit need be reiterated only in part whereby major portions thereof remain common to the various channels and need not be duplicated, thereby minimizing manufacturing cost, component space, heat generation, and power consumption.
CA002076804A 1991-08-26 1992-08-25 Electronic automatic temperature control Expired - Fee Related CA2076804C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/749,659 US5397874A (en) 1991-08-26 1991-08-26 Electric automatic temperature control
US749,659 1991-08-26

Publications (2)

Publication Number Publication Date
CA2076804A1 true CA2076804A1 (en) 1993-02-27
CA2076804C CA2076804C (en) 1998-07-28

Family

ID=25014649

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002076804A Expired - Fee Related CA2076804C (en) 1991-08-26 1992-08-25 Electronic automatic temperature control

Country Status (7)

Country Link
US (1) US5397874A (en)
EP (1) EP0530997B1 (en)
JP (1) JPH06168037A (en)
CA (1) CA2076804C (en)
DE (1) DE69224117T2 (en)
MY (1) MY109371A (en)
TW (1) TW267220B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6087631A (en) * 1997-03-14 2000-07-11 Hakko Corporation Soldering iron with temperature control cycles related to rectified voltage cycles
US6130414A (en) * 1998-08-19 2000-10-10 Advanced Micro Devices, Inc. Systems and methods for controlling semiconductor processing tools using measured current flow to the tool
US6580050B1 (en) * 2002-01-16 2003-06-17 Pace, Incorporated Soldering station with built-in self-calibration function
DE202010005938U1 (en) * 2010-04-21 2011-08-29 Dekema Dental-Keramiköfen GmbH Kiln with thermoelectric element
JP6473514B2 (en) * 2015-02-02 2019-02-20 佛山市▲順▼▲徳▼区美的▲電▼▲熱▼▲電▼器制造有限公司Ｆｏｓｈａｎ Ｓｈｕｎｄｅ Ｍｉｄｅａ Ｅｌｅｃｔｒｉｃａｌ Ｈｅａｔｉｎｇ Ａｐｐｌｉａｎｃｅｓ Ｍａｎｕｆａｃｔｕｒｉｎｇ Ｃｏ．，Ｌｉｍｉｔｅｄ Electromagnetic induction heating control circuit and electromagnetic induction heating equipment
CN108024403B (en) * 2016-11-03 2021-03-19 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system and control method and device thereof
CN107707224B (en) * 2017-09-25 2021-01-15 京东方科技集团股份有限公司 Temperature detection circuit, temperature sensor device, and display device
CN113332128B (en) * 2021-06-03 2023-07-04 深圳浩新工业产品设计有限公司 Steam hot compress type eye health care instrument control circuit
CN115639868B (en) * 2022-12-23 2023-03-21 南京伟思医疗科技股份有限公司 Self-adaptive temperature control method, device and system for magnetic stimulation device

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584291A (en) * 1969-07-30 1971-06-08 Powers Regulator Co Proportional electric heat control system
US3878358A (en) * 1972-11-16 1975-04-15 Xerox Corp Digital power control
US4029937A (en) * 1974-10-04 1977-06-14 Russell Robert G Control system for electrically conductive liquid heating apparatus
JPS5146951A (en) * 1974-10-18 1976-04-22 Omron Tateisi Electronics Co ONDOKONTOROORA
US4035787A (en) * 1975-10-21 1977-07-12 General Electric Company Food temperature responsive control apparatus
US4086466A (en) * 1976-04-30 1978-04-25 Scharlack Ronald S Automatic heater controller
US4167663A (en) * 1977-01-24 1979-09-11 Baxter Travenol Laboratories, Inc. Blood warming apparatus
US4400613A (en) * 1978-12-04 1983-08-23 General Electric Company Temperature controller for a fusing roller
ATE19699T1 (en) * 1982-03-20 1986-05-15 Vaillant Gmbh SETPOINT SENSOR FOR A TEMPERATURE CONTROLLER.
DE3228202C2 (en) * 1982-07-28 1990-11-15 ERSA Ernst Sachs KG, GmbH & Co, 6980 Wertheim Circuit arrangement for regulating the operating temperature of the heating element of an electrical soldering device, in particular a soldering iron
JPS59133062A (en) * 1983-01-21 1984-07-31 Konishiroku Photo Ind Co Ltd Heating power controller for inkjet printer
US4507546A (en) * 1983-03-01 1985-03-26 Fortune William S Control circuit responsive to a component's varying resistance
FR2557752B1 (en) * 1984-01-04 1986-08-14 Seb Sa DEVICE AND METHOD FOR CONTROLLING AND REGULATING THE TEMPERATURE OF A HEATING ELECTRIC RESISTOR
GB8511730D0 (en) * 1985-05-09 1985-06-19 Gorby Ltd John Press for fabrics
DE3818974A1 (en) * 1988-06-03 1990-02-08 Ruthenberg Gmbh Waermetechnik CONTROL AND MONITORING CIRCUIT FOR ELECTRIC SEAT HEATERS, ESPECIALLY OF MOTOR VEHICLES
KR910007164B1 (en) * 1989-04-01 1991-09-19 마준호 Control devices of cooking vessels

Also Published As

Publication number Publication date
US5397874A (en) 1995-03-14
MY109371A (en) 1997-01-31
EP0530997B1 (en) 1998-01-21
EP0530997A1 (en) 1993-03-10
DE69224117T2 (en) 1998-09-03
JPH06168037A (en) 1994-06-14
DE69224117D1 (en) 1998-02-26
CA2076804C (en) 1998-07-28
TW267220B (en) 1996-01-01

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed