GB1432862A - Windscreen-heating arrangements - Google Patents

Windscreen-heating arrangements

Info

Publication number
GB1432862A
GB1432862A GB421073A GB421073A GB1432862A GB 1432862 A GB1432862 A GB 1432862A GB 421073 A GB421073 A GB 421073A GB 421073 A GB421073 A GB 421073A GB 1432862 A GB1432862 A GB 1432862A
Authority
GB
United Kingdom
Prior art keywords
temperature
voltage
windscreen
jan
deviation
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
GB421073A
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB421073A priority Critical patent/GB1432862A/en
Priority to JP49010580A priority patent/JPS49109945A/ja
Priority to FR7402464A priority patent/FR2215773B3/fr
Publication of GB1432862A publication Critical patent/GB1432862A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/035—Electrical circuits used in resistive heating apparatus

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)
  • Amplifiers (AREA)

Abstract

1432862 Automatic control of temperature PLESSEY CO Ltd 15 Jan 1974 [26 Jan 1973] 4210/73 Heading G3R A windscreen heater element WH, Fig. I, e.g. of an aircraft or other vehicle, is energized by current pulses via transistors T2, T3, the mark/ space ratio of the pulses being controlled by a pulse width modulator circuit PM as a function of the deviation in windscreen temperature, sensed by a resistive sensor THR, from a desired temperature. A constant amplitude pulse is produced by a differential amplifier DA of the modulator PM each period a control voltage V E , constituted by a sawtooth voltage V S from a relaxation oscillator ROS plus a variable voltage V EO , exceeds a DC reference voltage level VR, as illustrated in Fig. 2. The voltage level VEO, and hence the control voltage VE, is modified as a function of the temperature deviation by a signal from a bridge circuit BC containing the temperature sensor THR Overcurrent prevention is effected by a feedback arrangement (schematically shown) via a resistor VAR.
GB421073A 1973-01-26 1973-01-26 Windscreen-heating arrangements Expired GB1432862A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB421073A GB1432862A (en) 1973-01-26 1973-01-26 Windscreen-heating arrangements
JP49010580A JPS49109945A (en) 1973-01-26 1974-01-24
FR7402464A FR2215773B3 (en) 1973-01-26 1974-01-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB421073A GB1432862A (en) 1973-01-26 1973-01-26 Windscreen-heating arrangements

Publications (1)

Publication Number Publication Date
GB1432862A true GB1432862A (en) 1976-04-22

Family

ID=9772821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB421073A Expired GB1432862A (en) 1973-01-26 1973-01-26 Windscreen-heating arrangements

Country Status (3)

Country Link
JP (1) JPS49109945A (en)
FR (1) FR2215773B3 (en)
GB (1) GB1432862A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506137A (en) * 1983-02-18 1985-03-19 Meister Jack B Temperature responsive control circuit for electric window de-fogger/deicer heater
US9957049B2 (en) 2013-08-28 2018-05-01 The Boeing Company Retractable shade and method for assembling the same
WO2019232598A1 (en) * 2018-06-06 2019-12-12 Embraer S.A. Aircraft window heating system with regulated dc voltage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726458A1 (en) * 1977-06-11 1979-01-04 Bosch Gmbh Robert ELECTRICALLY POWERED RAPID HEATING DEVICE
FR2421589A1 (en) * 1977-06-17 1979-11-02 Saint Gobain Vehicle rear window heating circuit - consists of humidity detector and time switch for circuit with thermistor
FR2440580A1 (en) * 1978-11-02 1980-05-30 Fonderie Soc Gen De Control system for heaters - has central control unit passing control voltage via single line to power limiters of all heaters
DE3828525A1 (en) * 1988-08-23 1990-03-01 Bayerische Motoren Werke Ag FUEL FILTER WITH HEATING ELEMENT AND INTEGRATED POWER ELECTRONICS
JP3024696B2 (en) * 1994-09-01 2000-03-21 ファナック株式会社 Temperature control method for injection molding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506137A (en) * 1983-02-18 1985-03-19 Meister Jack B Temperature responsive control circuit for electric window de-fogger/deicer heater
US9957049B2 (en) 2013-08-28 2018-05-01 The Boeing Company Retractable shade and method for assembling the same
WO2019232598A1 (en) * 2018-06-06 2019-12-12 Embraer S.A. Aircraft window heating system with regulated dc voltage

Also Published As

Publication number Publication date
FR2215773B3 (en) 1976-11-19
FR2215773A1 (en) 1974-08-23
JPS49109945A (en) 1974-10-19

Similar Documents

Publication Publication Date Title
US3523182A (en) Variable cycle rate and duty cycle temperature controls
GB1432862A (en) Windscreen-heating arrangements
US3646370A (en) Stabilized monostable delay multivibrator or one-shot apparatus
GB1455763A (en)
US3733463A (en) Temperature control system with a pulse width modulated bridge
GB1457635A (en) Sensitive pulse threshold detector
Subbotina The maximum principle and the superdifferential of the value function.
GB1220813A (en) Improvements in or relating to function generators
GB1391538A (en) Electrical oscillators
GB1481063A (en) Constant speed regulators for electric motors
GB1474788A (en) Method and apparatus for voltage measurement
GB1339258A (en) Proportional-integral electric regulating means
GB1324707A (en) Electrical arrangement for measuring and controlling the tempera ture at a large number of points
US4132465A (en) Electrochrome element control device
US4005283A (en) Squaring circuit apparatus
GB1102455A (en) Envelope transfer network for amplitude modulated signals
GB1505829A (en) Pulse modulated amplifiers
HEYSER Temperature control system with a pulse width modulated bridge(Temperature control system comprised of wheatstone bridge with RC circuit)[Patent]
ES2001241A6 (en) Constant-current control circuit for a stepped motor of single-pole type, particularly for use in motor vehicles
US4323861A (en) Oscillator circuit for controlling the power level of a microwave oven
JPS57152970A (en) Heat-sensitive recorder
US4242644A (en) Pulse modulator for operating a device in the avalanche mode
GB1494146A (en) Modulator circuit arrangement
GB1519092A (en) Voltage controlled oscillator circuit
EP0036042A3 (en) Arrangement to limit frequency variations of a quartz oscillator due to temperture variations

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee