GB1184005A - Defrosting Controller for Electric Refrigerator - Google Patents

Defrosting Controller for Electric Refrigerator

Info

Publication number
GB1184005A
GB1184005A GB39524/68A GB3952468A GB1184005A GB 1184005 A GB1184005 A GB 1184005A GB 39524/68 A GB39524/68 A GB 39524/68A GB 3952468 A GB3952468 A GB 3952468A GB 1184005 A GB1184005 A GB 1184005A
Authority
GB
United Kingdom
Prior art keywords
defrosting
conductive
transistor
thermistor
aug
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.)
Expired
Application number
GB39524/68A
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
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 Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Publication of GB1184005A publication Critical patent/GB1184005A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

1,184,005. Semi-conductor switching circuits. MATSUSHITA ELECTRONICS CORP. 18 Aug., 1968 [31 Aug., 1967], No. 39524/68. Heading H3T. [Also in Divisions F4 and G1] In a circuit for controlling the defrosting of a refrigerator, when a thermistor 6 is cold enough, a transistor TR 1 is biased to cut-off, thereby making transistors TR 2 and TR 3 conductive and blocking a diode D2 so that when a timer (not shown) closes a switch SW to initiate defrosting, both diodes D1 and D2 are blocked, thereby making transistor TR 4 and a thyristor SG 1 conductive to allow current to flow in the defrosting circuit. TR 5 is also turned on so that bi-directional device 26 turns on SG 2 . When thermistor 6 reaches a predetermined temperature, its resistance is low enough for transistor TR 1 to be conductive and in turn to make diode D 2 conduct to bias transistors TR 4 and TR 5 into cut-off, thereby terminating the defrosting operation.
GB39524/68A 1967-08-31 1968-08-19 Defrosting Controller for Electric Refrigerator Expired GB1184005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5627767 1967-08-31

Publications (1)

Publication Number Publication Date
GB1184005A true GB1184005A (en) 1970-03-11

Family

ID=13022574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39524/68A Expired GB1184005A (en) 1967-08-31 1968-08-19 Defrosting Controller for Electric Refrigerator

Country Status (6)

Country Link
US (1) US3498073A (en)
ES (1) ES357704A1 (en)
FR (1) FR1577195A (en)
GB (1) GB1184005A (en)
NL (1) NL145690B (en)
SE (1) SE339016B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206612A (en) * 1977-07-15 1980-06-10 Emhart Industries, Inc. Refrigeration system control method and apparatus
US4173871A (en) * 1977-12-27 1979-11-13 General Electric Company Refrigeration apparatus demand defrost control system and method
US4785640A (en) * 1987-06-01 1988-11-22 Hoshizaki Electric Co., Ltd. Freezing apparatus using a rotary compressor
US6205803B1 (en) * 1996-04-26 2001-03-27 Mainstream Engineering Corporation Compact avionics-pod-cooling unit thermal control method and apparatus
US20040168451A1 (en) * 2001-05-16 2004-09-02 Bagley Alan W. Device and method for operating a refrigeration cycle without evaporator icing
US6701729B2 (en) 2001-05-16 2004-03-09 Bbc Enterprises, Inc. Device and method for operating a refrigeration cycle without evaporator icing
US6519956B2 (en) * 2001-05-16 2003-02-18 Alan W. Bagley Device and method for operating a refrigeration cycle without evaporator icing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126712A (en) * 1964-03-31 Defrost control for refrigeration systems
US2847833A (en) * 1955-09-01 1958-08-19 Carrier Corp Defrost control for refrigeration systems

Also Published As

Publication number Publication date
ES357704A1 (en) 1970-03-16
NL6812352A (en) 1969-03-04
FR1577195A (en) 1969-08-01
NL145690B (en) 1975-04-15
US3498073A (en) 1970-03-03
SE339016B (en) 1971-09-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee