ES361706A1 - Defrosting control circuit for electric refrigerator - Google Patents
Defrosting control circuit for electric refrigeratorInfo
- Publication number
- ES361706A1 ES361706A1 ES361706A ES361706A ES361706A1 ES 361706 A1 ES361706 A1 ES 361706A1 ES 361706 A ES361706 A ES 361706A ES 361706 A ES361706 A ES 361706A ES 361706 A1 ES361706 A1 ES 361706A1
- Authority
- ES
- Spain
- Prior art keywords
- freezer
- transistor
- conductive
- thermistor
- transistors
- 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
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)
- Control Of Temperature (AREA)
Abstract
A defrosting control circuit for an electric refrigerator has a first transistor 1 for triggering a solid state switching element e.g. a thyristor 3, and a second transistor 2 for resetting the circuit on completion of a defrosting operation, the second transistor base being supplied with a determined potential while the element is conductive and a temperature detecting element e.g. a thermistor 10, sensitive to the temperature inside the freezer, arranged to supply a base bias to one of the transistors during the defrosting operation. Momentary closure of a pair of manually or time-switch operated contacts 8 renders transistors 1, 2 conductive which fires a thyristor 3 energizing a defrosting heater 6, the voltage across which maintains the transistors conductive on release of the switch 8. A rise of temperature of the freezer decreases the resistance of thermistor 10 which at a given point resets the circuit into a non-conductive condition. In another arrangement. Fig. 2 (not shown), the contacts 8 and thermistor are connected to the base of transistor 2. The heater 6 may be replaced by a valve through which a hot gas may be supplied to the freezer. The arrangement is stated to completely defrost a freezer irrespective of the amount of frost accumulated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8249167 | 1967-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES361706A1 true ES361706A1 (en) | 1970-11-01 |
Family
ID=13775952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES361706A Expired ES361706A1 (en) | 1967-12-23 | 1968-12-20 | Defrosting control circuit for electric refrigerator |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3514966A (en) |
| DE (1) | DE1816176A1 (en) |
| ES (1) | ES361706A1 (en) |
| FR (1) | FR1596262A (en) |
| GB (1) | GB1198380A (en) |
| NL (1) | NL149303B (en) |
| SE (1) | SE343132B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3759049A (en) * | 1972-02-25 | 1973-09-18 | Whirlpool Co | Defrost control |
| GB1456639A (en) * | 1972-12-02 | 1976-11-24 | Lucas Electrical Ltd | Temperature sensitive electronic switching arrangements |
| JPS5139702B2 (en) * | 1973-11-05 | 1976-10-29 | ||
| US4305259A (en) * | 1980-04-03 | 1981-12-15 | Eaton Corporation | Frost sensor employing self-heating thermistor as sensor element |
| US5842355A (en) * | 1995-03-22 | 1998-12-01 | Rowe International, Inc. | Defrost control system for a refrigerator |
| EP2393857B1 (en) | 2009-02-05 | 2019-05-29 | Arkema Inc. | Assemblies containing polyetherketoneketone tie layers |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3248892A (en) * | 1963-02-25 | 1966-05-03 | Texas Instruments Inc | Refrigeration control regulating temperature and frost build-up |
| US3363429A (en) * | 1966-03-11 | 1968-01-16 | Motorola Inc | Temperature control circuit for refrigeration system |
-
1968
- 1968-12-16 US US783792A patent/US3514966A/en not_active Expired - Lifetime
- 1968-12-20 SE SE17680/68A patent/SE343132B/xx unknown
- 1968-12-20 NL NL686818375A patent/NL149303B/en unknown
- 1968-12-20 DE DE19681816176 patent/DE1816176A1/en active Granted
- 1968-12-20 ES ES361706A patent/ES361706A1/en not_active Expired
- 1968-12-20 FR FR1596262D patent/FR1596262A/fr not_active Expired
- 1968-12-20 GB GB60721/68A patent/GB1198380A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1816176A1 (en) | 1969-07-24 |
| US3514966A (en) | 1970-06-02 |
| NL6818375A (en) | 1969-06-25 |
| NL149303B (en) | 1976-04-15 |
| FR1596262A (en) | 1970-06-15 |
| GB1198380A (en) | 1970-07-15 |
| DE1816176C3 (en) | 1973-10-11 |
| SE343132B (en) | 1972-02-28 |
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