EP0285417A3 - Soft start solid state switch - Google Patents

Soft start solid state switch Download PDF

Info

Publication number
EP0285417A3
EP0285417A3 EP88302885A EP88302885A EP0285417A3 EP 0285417 A3 EP0285417 A3 EP 0285417A3 EP 88302885 A EP88302885 A EP 88302885A EP 88302885 A EP88302885 A EP 88302885A EP 0285417 A3 EP0285417 A3 EP 0285417A3
Authority
EP
European Patent Office
Prior art keywords
lamp
current
significantly
control circuitry
essentially constant
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.)
Withdrawn
Application number
EP88302885A
Other languages
German (de)
French (fr)
Other versions
EP0285417A2 (en
Inventor
Peter John Carlson
Robert George Hodgins
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority claimed from GB878707636A external-priority patent/GB8707636D0/en
Priority claimed from US07/163,534 external-priority patent/US5015921A/en
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP0285417A2 publication Critical patent/EP0285417A2/en
Publication of EP0285417A3 publication Critical patent/EP0285417A3/en
Withdrawn legal-status Critical Current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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/02—Switching on, e.g. with predetermined rate of increase of lighting current

Landscapes

  • Electronic Switches (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The junction temperature rise of a power MOSFET (12;202;402) serially connected to a lamp (32;204;404) whose resistance nonlinearly increases during turn-on is moderated by the use of control circuitry which initially sets up a relatively low essentially constant current flow through the lamp and transistor and then automatically after the lamp resistance reaches a preselected level, the lamp is allowed to draw significantly more current. Alternatively, there is initially an essentially constant flow of current to the MOSFET gate, causing a gradual turn-on, until the lamp resistance reaches the preselected level. The size and therefore cost of the power MOSFET is reduced significantly because the magnitude of the current spike generated by turning on the lamp is significantly reduced by the use of the novel control circuitry.
EP88302885A 1987-03-31 1988-03-30 Soft start solid state switch Withdrawn EP0285417A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8707636 1987-03-31
GB878707636A GB8707636D0 (en) 1987-03-31 1987-03-31 Switch
US163534 1988-03-17
US07/163,534 US5015921A (en) 1988-03-17 1988-03-17 Soft start solid state switch

Publications (2)

Publication Number Publication Date
EP0285417A2 EP0285417A2 (en) 1988-10-05
EP0285417A3 true EP0285417A3 (en) 1989-03-01

Family

ID=26292081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88302885A Withdrawn EP0285417A3 (en) 1987-03-31 1988-03-30 Soft start solid state switch

Country Status (3)

Country Link
EP (1) EP0285417A3 (en)
JP (1) JPS63308409A (en)
CA (1) CA1314070C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839761A1 (en) * 1988-11-25 1990-05-31 Telefunken Electronic Gmbh Circuit for controlling the operation of an incandescent lamp
US4987348A (en) * 1989-12-15 1991-01-22 North American Philips Corporation Bilevel current limiter
GB2283586A (en) * 1993-10-26 1995-05-10 Brenda Olliver A battery and lamp economising circuit for hazard warning devices
FI991042A0 (en) 1999-05-06 1999-05-06 Iws International Oy Control circuit for the elimination of a voltage and current peak
EP2119317A1 (en) * 2007-02-13 2009-11-18 Osram Gesellschaft mit Beschränkter Haftung Led module and method for operating at least one led

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390812A (en) * 1981-06-25 1983-06-28 Seidler Robert L Regulator and switching circuit for flasher units
WO1984000463A1 (en) * 1982-07-06 1984-02-02 Stroede Aake Protection device for electrical incandescent lamps

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390812A (en) * 1981-06-25 1983-06-28 Seidler Robert L Regulator and switching circuit for flasher units
WO1984000463A1 (en) * 1982-07-06 1984-02-02 Stroede Aake Protection device for electrical incandescent lamps

Also Published As

Publication number Publication date
CA1314070C (en) 1993-03-02
EP0285417A2 (en) 1988-10-05
JPS63308409A (en) 1988-12-15

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