GB1302760A - - Google Patents
Info
- Publication number
- GB1302760A GB1302760A GB1885270A GB1885270A GB1302760A GB 1302760 A GB1302760 A GB 1302760A GB 1885270 A GB1885270 A GB 1885270A GB 1885270 A GB1885270 A GB 1885270A GB 1302760 A GB1302760 A GB 1302760A
- Authority
- GB
- United Kingdom
- Prior art keywords
- during
- heater
- negative half
- half cycle
- thyristor
- 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
-
- 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
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Abstract
1302760 Triggering thyristors MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 20 April 1970 [22 April 1969 27 May 1969] 18852/70 Heading H2F [Also in Division G3] In an electric blanket temperature control arrangement the blanket heater wire 17 (Fig. 3) is supplied during positive half cycles of an A.C. source 11 via a thyristor 15 and a diode 16. The thyristor is triggered only during negative half cycles by a pulse from a transformer 22 when a neon tube 21 fires and at this time a capacitor 23, which was charged during the negative half cycle via a diode 25, discharges through Th 15 and R24. The time constant of C23, R24 is such that the discharge of C23 continues to flow through Th 15 maintaining a holding current therein until current begins to flow therethrough from the source 11 during the next positive half-cycle. Thereby zero voltage switching of the heater load is obtained and radio frequency interference is substantially reduced. The desired temp. is preset on a resistor 18 and the actual temperature is sensed by a thermistor 19 between the heater wire 17 and a defector wire 20. The lower the temp. the higher the impedance of the thermistor and the greater the proportion of the supply voltage thereacross. When this voltage proportion is such that the firing potential of neon tube 21 is exceeded during a negative half cycle, the thyristor is fired and the heater is subsequently energized during the next position half cycle. If Th 15 is not triggered during a negative half cycle it will be blocked by the charge on C23. In an alternative embodiment Fig. 6 (not shown) the thermistor material is between a pair of signal wires one of which is connected to the neon tube pulse generator, and there is a pair of heater wires with insulation therebetween which insulation becomes molten above the desired temp. whereby the heaters will short circuit and blow a fuse cutting off the blanket heater current.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP44032423A JPS4925975B1 (en) | 1969-04-22 | 1969-04-22 | |
JP4343569A JPS4949589B1 (en) | 1969-05-27 | 1969-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1302760A true GB1302760A (en) | 1973-01-10 |
Family
ID=26370989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1885270A Expired GB1302760A (en) | 1969-04-22 | 1970-04-20 |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2018896C3 (en) |
FR (1) | FR2044736A1 (en) |
GB (1) | GB1302760A (en) |
NL (1) | NL150591B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2289551A (en) * | 1994-05-18 | 1995-11-22 | Marcus John Milner Blackburn | Method of electrical heating control |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1601126A (en) * | 1977-10-11 | 1981-10-28 | Dreamland Electrical Appliance | Heating circuits |
JPS54138978A (en) * | 1978-04-20 | 1979-10-27 | Matsushita Electric Ind Co Ltd | Temperature controller |
JPS5541632A (en) * | 1978-09-15 | 1980-03-24 | Matsushita Electric Works Ltd | Plane heater temperature control system |
-
1970
- 1970-04-20 GB GB1885270A patent/GB1302760A/en not_active Expired
- 1970-04-20 DE DE2018896A patent/DE2018896C3/en not_active Expired
- 1970-04-21 NL NL707005736A patent/NL150591B/en unknown
- 1970-04-21 FR FR7014431A patent/FR2044736A1/fr active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2289551A (en) * | 1994-05-18 | 1995-11-22 | Marcus John Milner Blackburn | Method of electrical heating control |
Also Published As
Publication number | Publication date |
---|---|
NL150591B (en) | 1976-08-16 |
DE2018896C3 (en) | 1975-02-20 |
FR2044736A1 (en) | 1971-02-26 |
DE2018896B2 (en) | 1974-06-27 |
NL7005736A (en) | 1970-10-26 |
DE2018896A1 (en) | 1970-11-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1255043A (en) | Solid-state constant power ballast for electric discharge device | |
GB1091636A (en) | A snap-action trigger circuit including a controlled rectifier switching device | |
GB1112511A (en) | Improvements in or relating to electric arc welding apparatus | |
US3586815A (en) | Welding control mechanism | |
US3462585A (en) | Electrically heated bedcover control | |
GB1302760A (en) | ||
GB1285777A (en) | Apparatus for controlling the energization of an electrical load and responsive to overheating | |
GB1206638A (en) | Apparatus for controlling the energization of an electrical load | |
US3732394A (en) | Iron | |
GB1358396A (en) | Starting means for a single-phase asynchronous el'ctric motor | |
US3747849A (en) | Control device for a heating installation | |
US3364363A (en) | Phase sequence sensing circuit | |
US3419708A (en) | Electronic heat control for dryer | |
US3585444A (en) | Energy supply circuit | |
US3586831A (en) | Heat response control circuit | |
US3373262A (en) | Temperature control circuit | |
US3454829A (en) | Spark-eroding apparatus | |
GB1373625A (en) | Pulse generators and applications thereof | |
US3600118A (en) | Furnace control apparatus | |
US2492575A (en) | Safety starter circuit and unit | |
US3535592A (en) | Rapidly operating solid state electronic switch with parallel tripping path | |
US3657564A (en) | Circuit providing fast pulse rise and fall times | |
US3544767A (en) | Heating control circuit with scr-unijunction transistor combination | |
GB1445711A (en) | Electric motor thermal overload protection circuit | |
US3582685A (en) | Zero crossover firing of thyristor means |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |