FR2438407A1 - Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault - Google Patents

Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault

Info

Publication number
FR2438407A1
FR2438407A1 FR7828235A FR7828235A FR2438407A1 FR 2438407 A1 FR2438407 A1 FR 2438407A1 FR 7828235 A FR7828235 A FR 7828235A FR 7828235 A FR7828235 A FR 7828235A FR 2438407 A1 FR2438407 A1 FR 2438407A1
Authority
FR
France
Prior art keywords
lamp
inductance
fault
gate
supply circuit
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.)
Granted
Application number
FR7828235A
Other languages
French (fr)
Other versions
FR2438407B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7828235A priority Critical patent/FR2438407A1/en
Publication of FR2438407A1 publication Critical patent/FR2438407A1/en
Application granted granted Critical
Publication of FR2438407B1 publication Critical patent/FR2438407B1/fr
Granted 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/46—Circuits providing for substitution in case of failure of the lamp

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The high power discharge lamp (L) is in series with an inductance (I). In parallel with these is a capacitor, (C). It is desirable that such circuits be disconnected from the supply if any of these components becomes faulty or if the continuous lamp current exceeds about 150% of its nominal value. This can be achieved by making the supply through a triac (T) whose conduction depends on signals from detector circuits. These detect the presence of currents in both the main component branches. Only if currents exist, and if that in the lamp is less than the set maximum does the AND gate (ET) operate. A time-delay circuit (CT) is provided for starting purposes. If either its output or that of the AND gate is positive, then the OR gate (OU) maintains conduction of the triac.
FR7828235A 1978-10-03 1978-10-03 Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault Granted FR2438407A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7828235A FR2438407A1 (en) 1978-10-03 1978-10-03 Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7828235A FR2438407A1 (en) 1978-10-03 1978-10-03 Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault

Publications (2)

Publication Number Publication Date
FR2438407A1 true FR2438407A1 (en) 1980-04-30
FR2438407B1 FR2438407B1 (en) 1981-04-30

Family

ID=9213276

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7828235A Granted FR2438407A1 (en) 1978-10-03 1978-10-03 Supply circuit for discharge lamp - uses trial to ensure disconnection if lamp inductance or capacitor develops fault

Country Status (1)

Country Link
FR (1) FR2438407A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2203426A1 (en) * 1971-01-28 1972-08-17 Nippon Denso Co Lamp failure detection system
DE2425720A1 (en) * 1974-05-28 1975-12-11 Siemens Ag Equalising ballast circuit for discharge lamps - provides protection against resonance effects in phase lines
US4099095A (en) * 1976-02-25 1978-07-04 General Electric Company Operating circuit for gaseous discharge and incandescent lamps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2203426A1 (en) * 1971-01-28 1972-08-17 Nippon Denso Co Lamp failure detection system
DE2425720A1 (en) * 1974-05-28 1975-12-11 Siemens Ag Equalising ballast circuit for discharge lamps - provides protection against resonance effects in phase lines
US4099095A (en) * 1976-02-25 1978-07-04 General Electric Company Operating circuit for gaseous discharge and incandescent lamps

Also Published As

Publication number Publication date
FR2438407B1 (en) 1981-04-30

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Legal Events

Date Code Title Description
ST Notification of lapse