FR2407636A1 - Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point - Google Patents

Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point

Info

Publication number
FR2407636A1
FR2407636A1 FR7729788A FR7729788A FR2407636A1 FR 2407636 A1 FR2407636 A1 FR 2407636A1 FR 7729788 A FR7729788 A FR 7729788A FR 7729788 A FR7729788 A FR 7729788A FR 2407636 A1 FR2407636 A1 FR 2407636A1
Authority
FR
France
Prior art keywords
switch
point
ptc
gradually reduces
zero
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Withdrawn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
FR7729788A
Other languages
French (fr)
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.)
DANDREL
Original Assignee
DANDREL
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 DANDREL filed Critical DANDREL
Priority to FR7729788A priority Critical patent/FR2407636A1/en
Publication of FR2407636A1 publication Critical patent/FR2407636A1/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Withdrawn legal-status Critical Current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
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/083—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The dimmer circuit gradually reduces the intensity of a light to zero over a given period of time after the light has been switched on. The circuit contains a PTC resistor (30) and an NTC resistor (17) both connected at one end to the secondary (32) of a transformer whose primary (31) is in series with the main switch (6). A triac (14) controls the current to the light. The gradual reduction in the NTC resistor temp., i.e. its increase in resistance after switch-on progressively retards the turn-on point of the tiac using a capacitor (23).
FR7729788A 1977-10-04 1977-10-04 Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point Withdrawn FR2407636A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7729788A FR2407636A1 (en) 1977-10-04 1977-10-04 Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7729788A FR2407636A1 (en) 1977-10-04 1977-10-04 Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point

Publications (1)

Publication Number Publication Date
FR2407636A1 true FR2407636A1 (en) 1979-05-25

Family

ID=9196072

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7729788A Withdrawn FR2407636A1 (en) 1977-10-04 1977-10-04 Dimmer circuit using PTC and NTC resistors - gradually reduces light intensity to zero after switch=on by controlling triac turn-on point

Country Status (1)

Country Link
FR (1) FR2407636A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2156951A5 (en) * 1971-10-11 1973-06-01 Dandrel
US3898516A (en) * 1973-05-29 1975-08-05 Henry H Nakasone Lighting control system for incandescent lamps
US4008416A (en) * 1973-05-29 1977-02-15 Nakasone Henry H Circuit for producing a gradual change in conduction angle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2156951A5 (en) * 1971-10-11 1973-06-01 Dandrel
US3898516A (en) * 1973-05-29 1975-08-05 Henry H Nakasone Lighting control system for incandescent lamps
US4008416A (en) * 1973-05-29 1977-02-15 Nakasone Henry H Circuit for producing a gradual change in conduction angle

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Legal Events

Date Code Title Description
ST Notification of lapse