EP0262254A1 - Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor - Google Patents

Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor Download PDF

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Publication number
EP0262254A1
EP0262254A1 EP19860113702 EP86113702A EP0262254A1 EP 0262254 A1 EP0262254 A1 EP 0262254A1 EP 19860113702 EP19860113702 EP 19860113702 EP 86113702 A EP86113702 A EP 86113702A EP 0262254 A1 EP0262254 A1 EP 0262254A1
Authority
EP
European Patent Office
Prior art keywords
input
inductor
power
terminal
bridge
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Withdrawn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
EP19860113702
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English (en)
French (fr)
Inventor
Eugene Lemmers
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 to US06/799,193 priority Critical patent/US4654774A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to EP19860113702 priority patent/EP0262254A1/de
Publication of EP0262254A1 publication Critical patent/EP0262254A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
    • H05B41/2325—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes

Definitions

  • This invention relates to d-c power supply circuits, and, more particularly, to a circuit for supplying d-c power to a load such as gas discharge lamps.
  • tubular fluorescent lamps on direct current is known to improve efficiency in terms of lumens of light output per watt input. This is primarily due to the fact that the low pressure mercury discharge is more efficient with d-c operation in producing resonant radiation with lower current density, when the mercury vapor pressure is in the conventionally used range.
  • the efficiency of d-c operation and efficacy in lumens per watt (LPW) when the lamp is operated on d-c current can be affected by the power factor and ripple factor of unidirectional current. It has been observed that operating with a power factor in the range of .9 and 1.0 and the ripple factor as low as possible are most desirable for efficient d-c operation.
  • An object of the present invention is to provide a low ripple, high power factor d-c power supply circuit.
  • a more specific object of the present invention is to provide an improved rectifier-capacitor bridge-type d-c power supply circuit as a gas discharge lamp ballasting circuit.
  • the power supply circuit of the present invention includes a rectifier-capacitor bridge circuit connected to an a-c power supply source having a series-connected a-c current-limiting inductor in the power supply line connected to the a-c source with a feedback link connecting the bridge circuit output terminals to the input side of the a-c inductor for providing power factor correction and low ripple in the unidirectional output signals.
  • the single figure is a schematic circuit diagram illustrating a d-c power supply circuit in accordance with the present invention.
  • a d-c power supply circuit of the present invention is shown schematically in the Figure connected to an electrical load comprising a pair of series-connected low pressure mercury vapor discharge lamps.
  • the term "direct current" is used in the present application to indicate unidirectional current including rectified alternating current having a ripple.
  • the power supply circuit 10 includes terminals 12, 14 connected to an a-c power supply, such as a 60 Hertz, 120 volt power line.
  • One input line 16 is connected to the terminal 12 and to one end of an inductor 18 which is connected at its opposite end to one terminal 20 of a bridge circuit 22 whose opposite input terminal 24 is connected to input terminal 14 via line 26.
  • Diode bridge 22 comprises diodes 28, 30, 32 and 34 con nected as shown.
  • diode 38 Connected in parallel with diode 28 between terminals 20 and 36 is capacitor 38, and connected between terminals 20 and 40 in parallel with diode 34 is capacitor 42. Connected from terminal 36 to terminal 44 is diode 46, and connected between terminals 40 and 44 is diode 48. Diodes 46, 48 provide feedback via line 50 to the input end 52 of the series inductor 18.
  • the load connected across terminals 36 and 40 includes d-c inductor 54 connected in series with series-connected low pressure mercury vapor discharge lamps 56 and 58.
  • Lamp 56 includes filaments 60 and 62 at the respective ends thereof.
  • Lamp 58 includes filaments 64 and 66 at the respective ends thereof.
  • a starting circuit of conventional design as described and claimed in U.S. Patent No. 3,096,464, issued to the present applicant on July 2, 1963, assigned to the present assignee and incorporated herein by reference thereto, or other conventional starting circuit, may be connected to the filaments at the ends of the respective lamps to provide lamp starting power.
  • the d-c power supply circuit 10 of the present invention operates as follows: When current is supplied to the bridge 22, the voltage on capacitors 38 and 42 builds up to approximately twice the line voltage and a unidirectional current is applied to the load via output terminals 36, 40. During one half-cycle of the input wave, a unidirectional current flows via terminal 12 through a-c inductor 18, terminal 20, diode 34, terminal 40, lamps 58 and 56, d-c inductor 54, terminal 36, diode 30 and terminal 24 to terminal 14.
  • a unidirectional current flows via terminal 14 through terminal 24, diode 32, terminal 40, lamps 58 and 56, d-c inductor 54, terminal 36, diode 28, terminal 20 and a-c inductor 18 to terminal 12.
  • the voltage across the capacitors 38 and 42 and consequently the voltage across the lamps 56 and 58 is approximately twice the line voltage.
  • a feedback tap at 44 at the junction of diodes 46 and 48 provides a feedback signal via diode 46 during one half-cycle of the input a-c signal and via diode 48 during the other half-cycle of the a-c input signal.
  • the feedback signal to the a-c inductor 18 results in a significant reduction in the ripple of the unidirectional output current supplied at terminals 36 and 40, especially at higher current levels resulting from the use of smaller inductance values for inductors 18 and 54.
  • the power supply circuit of the present invention produces a significantly improved power factor of the a-c input and a significantly reduced ripple factor of the d-c output wave compared to prior art power supply circuits.
  • terminals 12 and 14 were connected to a 120 volt, 60 Hertz power line.
  • An inductor 18 of about 0.335 henrys and about 4 ohms impedance was connected to one of said terminals.
  • the bridge circuit was connected as shown in the Figure and comprised four diodes with capacitors 38 and 42 each of about 7.5 microfarads at a voltage rating of about 200 volts.
  • a load was connected to output terminals 36 and 40 and comprised an inductor 54 of about 0.8 henrys and about 6.5 ohms impedance connected in series with a pair of series-connected fluorescent lamps of the four-foot, 34-watt low energy type (sold by the General Electric Company under the trademark WATT-MISER® II), using a krypton and argon gas mixture with mercury vapor as the discharge gas.
  • the average overall system efficacy was in the range of 90-92 LPW with a ripple factor of the d-c output in the range of 5 to 10 percent of average current and a power factor of the a-c input of about 0.95 at an output in the range of 5000 to 6000 lumens per pair of lamps.
  • ballast efficiency i.e., the ratio of watts output to watts input was about 96.2%.
  • the component values of the above example were employed, except that the inductance value of a-c inductor 18 was varied.
  • a value of 0.406 henries for inductor 18 resulted in a power factor of the a-c input signal of 0.9835 and a ripple factor of the d-c output of about 5% of the average current.
  • a value of 0.246 henries for a-c inductor 18 resulted in a power factor of the a-c input signal of 0.901 and a ripple factor of the d-c output of about 10%.
  • the d-c power supply circuit with the feedback connection as shown in the present invention allows adjustment of the power factor of the a-c input within the range of about 0.9 to about 1.00 and limiting of the ripple factor of the d-c output to within the range of 5 to 10 percent of average current by proper selection of inductance values for inductor 18 in the range of about 0.2 to about 0.5 henries.
  • the size of inductor 54 may also be varied between about 0.4 and 0.8 henries to control ripple factor of the d-c output. As the example above shows, the size of both inductors 18 and 54 can be small, and therefore the losses contributed by the inductors can be limited by using the feedback connection of the present invention.
  • the capacitance of capacitors 38 and 42 may preferably be in the range of 7.0 to 8.0 microfarads.
  • the circuit interactions responsible for this result are not fully understood, but in several tests the results show consistently that smaller component values can be used while maintaining power factor of the input in the desired 0.9 to 1.0 range with reduced ripple in the output, thereby verifying the improvement achieved by the present invention.
  • the same circuit configuration can be employed to supply d-c power to other types of lamps, for example, a d-c power supply circuit with approximately the same component values has been successfully used with 8-foot standard 40-watt fluorescent lamps. Also, the same circuit with appropriately selected component values can be used with a 277 volt a-c power supply. Therefore, it will be readily seen that the present invention provides an improved ballasting circuit for providing d-c power to loads such as low pressure mercury vapor discharge lamps.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP19860113702 1984-09-21 1986-10-03 Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor Withdrawn EP0262254A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/799,193 US4654774A (en) 1984-09-21 1985-11-18 Low ripple, high power factor a-c to d-c power supply
EP19860113702 EP0262254A1 (de) 1986-10-03 1986-10-03 Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860113702 EP0262254A1 (de) 1986-10-03 1986-10-03 Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor

Publications (1)

Publication Number Publication Date
EP0262254A1 true EP0262254A1 (de) 1988-04-06

Family

ID=8195476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860113702 Withdrawn EP0262254A1 (de) 1984-09-21 1986-10-03 Stromversorgung für Wechsel- auf Gleichstrom mit geringer Welligkeit und hohem Leistungsfaktor

Country Status (1)

Country Link
EP (1) EP0262254A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278023A (en) * 1993-05-12 1994-11-16 Evtacon Ltd Fluorescent tube control system
US7467483B2 (en) 2002-04-10 2008-12-23 Fisher & Paykel Appliances Limited Laundry appliance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233148A (en) * 1961-04-25 1966-02-01 Gen Electric Discharge lamp ballasting circuit
EP0091724A1 (de) * 1982-02-11 1983-10-19 North American Philips Lighting Corporation Ballastvorrichtung zum Betrieb einer Entladungslampe
CH643416A5 (en) * 1980-09-29 1984-05-30 Chung Nam Kim Method and device for illumination by fluorescence

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233148A (en) * 1961-04-25 1966-02-01 Gen Electric Discharge lamp ballasting circuit
CH643416A5 (en) * 1980-09-29 1984-05-30 Chung Nam Kim Method and device for illumination by fluorescence
EP0091724A1 (de) * 1982-02-11 1983-10-19 North American Philips Lighting Corporation Ballastvorrichtung zum Betrieb einer Entladungslampe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278023A (en) * 1993-05-12 1994-11-16 Evtacon Ltd Fluorescent tube control system
US7467483B2 (en) 2002-04-10 2008-12-23 Fisher & Paykel Appliances Limited Laundry appliance

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Inventor name: LEMMERS, EUGENE