GB1184543A - Improvements in or relating to Electrical Heating Systems. - Google Patents
Improvements in or relating to Electrical Heating Systems.Info
- Publication number
- GB1184543A GB1184543A GB07857/66A GB1785766A GB1184543A GB 1184543 A GB1184543 A GB 1184543A GB 07857/66 A GB07857/66 A GB 07857/66A GB 1785766 A GB1785766 A GB 1785766A GB 1184543 A GB1184543 A GB 1184543A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- circuit
- heater
- winding
- determined
- 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
- G05D23/2401—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 using a heating element as a sensing element
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
Abstract
1,184,543. Automatic temperature control systems. DUNLOP CO. Ltd. April 18, 1967 [April 23, 1966 (2)], Nos. 17856/66 and 17857/66. Heading G3R. A temperature control system for a de-icing heater having a resistance which varies with temperature comprises means for sensing changes in the heater resistance and a control means for reducing the power supplied to prevent the heater temperature rising above a determined level. The heater H is connected to a transformer voltage winding Vw and an opposing current winding I w which at the determined temperature reverse the phase of the secondary winding Sw output which through transistors Q1-Q3 and Q4-Q6, delays the firing angles of thyristors SCR1, 2 in proportion to the excess temperature. An over heat protective circuit, Fig.3, (not shown) comprises a transistor amplifier connected to winding Sw operating a relay which disconnects the supply and illuminates a warning lamp. In another arrangement voltages are derived from a heater having two sections of differing characteristics, Figs. 5 and 6 (not shown). A 3- phase star connected heater arrangement is described having thyristors in two mains leads, Fig. 7 (not shown). The output of winding Sw alternatively can be arranged through a variable ratio timer to cut-off the thyristors periodically for a determined time and an auxiliary circuit is arranged to operate at a higher temperature should the normal circuit fail. A low temperature circuit is also incorporated which at low temperatures periodically interrupts the supply when warming up the heaters. This circuit also incorporates thermistor detectors to cut-off the power at a determined thyristor temperature. An arcing detection circuit may be incorporated comprising three current transformers (T52-T54, Fig. 7, not shown) whose outputs are amplified in transistors (Q52-Q54, Fig. 9, not shown), and compared to cut-off power on inequality of current flow. This circuit is disabled if the inequality is due to an open circuit of one of the heaters.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US630450A US3496339A (en) | 1966-04-23 | 1967-04-12 | Electrical heating systems |
| DE19671615211 DE1615211A1 (en) | 1966-04-23 | 1967-04-22 | Control system for an electrical heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1785666 | 1966-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1184543A true GB1184543A (en) | 1970-03-18 |
Family
ID=10102422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB07857/66A Expired GB1184543A (en) | 1966-04-23 | 1966-04-23 | Improvements in or relating to Electrical Heating Systems. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1184543A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0105410A1 (en) * | 1982-09-30 | 1984-04-18 | The B.F. GOODRICH Company | Current circuit monitoring |
| GB2129584A (en) * | 1982-10-01 | 1984-05-16 | Gen Electric | Phase control circuit for low voltage load |
| US4523084A (en) * | 1981-09-02 | 1985-06-11 | Oximetrix, Inc. | Controller for resistive heating element |
-
1966
- 1966-04-23 GB GB07857/66A patent/GB1184543A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4523084A (en) * | 1981-09-02 | 1985-06-11 | Oximetrix, Inc. | Controller for resistive heating element |
| EP0105410A1 (en) * | 1982-09-30 | 1984-04-18 | The B.F. GOODRICH Company | Current circuit monitoring |
| GB2129584A (en) * | 1982-10-01 | 1984-05-16 | Gen Electric | Phase control circuit for low voltage load |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |