US3819981A - Automatic start circuit for lamp - Google Patents

Automatic start circuit for lamp Download PDF

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Publication number
US3819981A
US3819981A US00337419A US33741973A US3819981A US 3819981 A US3819981 A US 3819981A US 00337419 A US00337419 A US 00337419A US 33741973 A US33741973 A US 33741973A US 3819981 A US3819981 A US 3819981A
Authority
US
United States
Prior art keywords
voltage
current
tube
filament
transistor
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 - Lifetime
Application number
US00337419A
Other languages
English (en)
Inventor
A Diamond
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.)
Beckman Coulter Inc
Original Assignee
Beckman Instruments Inc
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 Beckman Instruments Inc filed Critical Beckman Instruments Inc
Priority to US00337419A priority Critical patent/US3819981A/en
Priority to CA184,116A priority patent/CA984897A/en
Priority to AU61931/73A priority patent/AU476777B2/en
Priority to GB5035073A priority patent/GB1429205A/en
Priority to FR7347108A priority patent/FR2220119B1/fr
Priority to DE19742409927 priority patent/DE2409927B2/de
Application granted granted Critical
Publication of US3819981A publication Critical patent/US3819981A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H05B41/044—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes
    • H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the anode 12 of lamp 10 is connected by means of lead 34 to first and second voltage sources.
  • An altemating current source 35 (350 VAC) is applied through isolating transformer 36 when switch 37 is actuated to close the circuit between alternating current source 35 and the primary winding of transformer 36.
  • the secondary winding of transformer 36 has one end thereof coupled to ground while the other end thereof is connected to the anode of diode 38, the cathode thereof being coupled through resistor 39 (15 K ohms) to lead 34. This provides a half wave rectified voltage through resistor 39.
  • the second voltage source V 150 V.D.C. has the positive side thereof coupled through diode 40 to lead 34.
  • a reset circuit 24 provides a reset pulse on lead 90 to reset counter 26 to zero.
  • Reset circuit 24 includes a PNP transistor 92 having the emitter thereof coupled to a voltage source +V and the base thereof coupled to the same voltage source through resistor 93 (10 K ohms).
  • the base of transistor 92 is connected through resistor 94 (l K ohms) in series with capacitor 95 (10 microfarads) to ground.
  • the collector of transistor 92 is coupled to lead 90 and also coupled through resistor 96 (220 ohms) to ground.
  • the purpose of the reset circuit is to ensure that the counter 26 starts in the zero state, inasmuch as in the event of power failure counter 26 can be in any state when power is applied if it is not reset.
  • voltage source +V When voltage source +V, is initially applied, capacitor 95 is discharged. Current then flows through the emitter to base junction of transistor 92 through resistor 94 to charge capacitor 95. This current turns on transistor 92, applying voltage to lead 90. This voltage sets the counter 26 to the zero state. As capacitor 95 charges, the voltage across it increases. When the voltage increases to the point that sufficient current can be supplied through resistor 93 to finish the charge and hold it, transistor 92 turns off. Resistor 96 then pulls the voltage on lead 90 down below the threshold of the reset input of counter 26. Resistor 96 must be small enough to hold the voltage thereacross below 0.7 volts.
  • the basic circuit is a voltage follower, that is, the voltage at the emitter of transistor 44 will approximately equal the voltage at the junction of resistors 60 and 61.
  • Resistor 49 is a current limiting resistor to limit the current output from operational amplifier 42 to the base of transistor 43.
  • Transistor 43 functions as an emitter follower to give current amplification to the current flowing through resistor 49.
  • Diode 50 is a protection diode to prevent high voltage from being applied back through resistor 43 into the voltage source +V in the event transistor 44 should fail.
  • Resistor 52 is a current limiting resistor to protect transistor 43, with resistor 51 being a base bias resistor for transistor 44.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
US00337419A 1973-03-02 1973-03-02 Automatic start circuit for lamp Expired - Lifetime US3819981A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00337419A US3819981A (en) 1973-03-02 1973-03-02 Automatic start circuit for lamp
CA184,116A CA984897A (en) 1973-03-02 1973-10-24 Automatic start circuit for a lamp having an anode and a cathode or filament
AU61931/73A AU476777B2 (en) 1973-03-02 1973-10-29 Automatic start circuit for lamp
GB5035073A GB1429205A (en) 1973-03-02 1973-10-30 Control circuit for starting and operating a gas-filled valve
FR7347108A FR2220119B1 (enrdf_load_html_response) 1973-03-02 1973-12-28
DE19742409927 DE2409927B2 (de) 1973-03-02 1974-03-01 Start- und betriebsschaltung fuer eine gasgefuellte roehre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00337419A US3819981A (en) 1973-03-02 1973-03-02 Automatic start circuit for lamp

Publications (1)

Publication Number Publication Date
US3819981A true US3819981A (en) 1974-06-25

Family

ID=23320475

Family Applications (1)

Application Number Title Priority Date Filing Date
US00337419A Expired - Lifetime US3819981A (en) 1973-03-02 1973-03-02 Automatic start circuit for lamp

Country Status (6)

Country Link
US (1) US3819981A (enrdf_load_html_response)
AU (1) AU476777B2 (enrdf_load_html_response)
CA (1) CA984897A (enrdf_load_html_response)
DE (1) DE2409927B2 (enrdf_load_html_response)
FR (1) FR2220119B1 (enrdf_load_html_response)
GB (1) GB1429205A (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742276A (en) * 1986-07-25 1988-05-03 The Perkin-Elmer Corporation Regulated deuterium arc supply system
US4792727A (en) * 1987-10-05 1988-12-20 Gte Products Corporation System and method for operating a discharge lamp to obtain positive volt-ampere characteristic
US4939421A (en) * 1986-06-23 1990-07-03 Motorola, Inc. Method and apparatus for reducing interference from light sources
FR2736434A1 (fr) * 1995-07-07 1997-01-10 Secomam Sa Spectrophotometre portatif et autonome pour l'analyse spectrale aux ultraviolets, d'echantillons liquides
US20080231916A1 (en) * 2007-03-23 2008-09-25 Takanori Inadome Image reading device and image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4438370A (en) * 1981-03-03 1984-03-20 Isco, Inc. Lamp circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939421A (en) * 1986-06-23 1990-07-03 Motorola, Inc. Method and apparatus for reducing interference from light sources
US4742276A (en) * 1986-07-25 1988-05-03 The Perkin-Elmer Corporation Regulated deuterium arc supply system
US4792727A (en) * 1987-10-05 1988-12-20 Gte Products Corporation System and method for operating a discharge lamp to obtain positive volt-ampere characteristic
FR2736434A1 (fr) * 1995-07-07 1997-01-10 Secomam Sa Spectrophotometre portatif et autonome pour l'analyse spectrale aux ultraviolets, d'echantillons liquides
EP0753724A1 (fr) * 1995-07-07 1997-01-15 Secomam S.A. Spectrophotomètre portatif et autonome pour l'analyse spectrale aux ultraviolets, d'échantillons liquides
US20080231916A1 (en) * 2007-03-23 2008-09-25 Takanori Inadome Image reading device and image forming apparatus
US8314977B2 (en) * 2007-03-23 2012-11-20 Ricoh Company, Ltd. Image reading device and image forming apparatus

Also Published As

Publication number Publication date
DE2409927B2 (de) 1976-04-08
GB1429205A (en) 1976-03-24
AU6193173A (en) 1975-05-01
DE2409927A1 (de) 1974-09-26
FR2220119A1 (enrdf_load_html_response) 1974-09-27
AU476777B2 (en) 1976-10-07
FR2220119B1 (enrdf_load_html_response) 1976-11-19
CA984897A (en) 1976-03-02

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