EP0659036A1 - Ballast redresseur - Google Patents

Ballast redresseur Download PDF

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Publication number
EP0659036A1
EP0659036A1 EP93120361A EP93120361A EP0659036A1 EP 0659036 A1 EP0659036 A1 EP 0659036A1 EP 93120361 A EP93120361 A EP 93120361A EP 93120361 A EP93120361 A EP 93120361A EP 0659036 A1 EP0659036 A1 EP 0659036A1
Authority
EP
European Patent Office
Prior art keywords
voltage
rectifier
ballast
capacitors
capacitor
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Withdrawn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
EP93120361A
Other languages
German (de)
English (en)
Inventor
Heinrich Korte
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 EP93120361A priority Critical patent/EP0659036A1/fr
Publication of EP0659036A1 publication Critical patent/EP0659036A1/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a rectifier ballast for exciting and operating a discharge lamp using a voltage multiplication circuit according to the preamble of claim 1.
  • a ballast of this type is known for example from DE-OS 40 16 684. With this device, however, the smoothing of the current is limited and pronounced current peaks occur.
  • the object of the invention is to provide a ballast for operating a fluorescent lamp which achieves better smoothing of the current with fewer peaks.
  • the capacitors of the doubler stage are only supplied with DC voltage during operation in this rectifier ballast by connecting a bridge rectifier, so that electrolytic capacitors can now also be used in the circuit.
  • the first doubler stage is designed such that one or more resistors are connected in series with each electrolytic capacitor. This has the advantage that after each line voltage zero crossing, not only the ignition but also the power supply for a short time takes place through the electrolytic capacitors before the lamp voltage is reached.
  • the lamp current is optimally damped in this phase by the series-connected resistors. The otherwise occurring phase gating and the associated current peak is largely prevented.
  • the fluorescent lamp is supplied via the upstream AC capacitor.
  • the electrolytic capacitors are charged or discharged counter-clockwise at the beginning of a mains voltage half-wave.
  • damping resistors are not located directly in the lamp circuit and only dampen part of the lamp current, the power consumption in the damping is also reduced.
  • the ballast in the embodiment of FIG. 1 comprises six diodes D1-D6, four resistors R1-R4 and five capacitors C1-C5, the capacitors C2 and C3 being designed as electrolytic capacitors.
  • the ballast is connected to an AC power supply VAC by connections A and B.
  • the connecting line A leads to one side of a capacitor C1, to which a resistor R1 is connected in parallel.
  • the capacitor C1 and the resistor R1 are on the other hand connected to the anode of a diode D1 and a parallel capacitor C4.
  • the cathode of the diode D1 is connected via a further diode D3 to one side of the fluorescent lamp LL.
  • a series circuit consisting of a resistor is connected in parallel with the diode D2 R2 and an electrolytic capacitor C2.
  • the connecting line A is still connected via a capacitor C5 to the other side of the fluorescent lamp LL.
  • This side of the lamp LL leads to the anode connection of a diode D6, the cathode of which consists of a mesh and a diode D5 is connected in parallel to an electrolytic capacitor C3 in series with a resistor R3 to the line B. Furthermore, the cathode of the diode 6 is still connected to the anode connection of the diode D4, the cathode of which is connected to the connecting line A.
  • a resistor R4 is also located between the cathode connection of the diode D6 and the anode connection of the diode D3.
  • the capacitors C2 and C3 together with the diodes D1 and D4 form a first stage, and the capacitors C4 and C5 together with the diodes D3 and D6 form a second stage of the voltage multiplier.
  • the function of the circuit described above is as follows: If the half-wave on the capacitor C1 is positive, the capacitor C2 is charged to a peak value via the diodes D1 / R2 and at the same time the capacitor C5 via the diodes D6 / D5. In the event of a negative half wave on the capacitor C1, the capacitor C3 is charged to a peak value via the diodes D4 / R3 and at the same time the capacitor C4 via the diodes D2 / D3. Thus, after a complete period by adding the two partial voltages across the capacitors C4 / C5, there is already twice the peak value of the supply voltage across the lamp LL.
  • capacitor C5 is charged to twice the peak value via diode D6, capacitor C3 and resistor R3.
  • the capacitor C4 is charged to twice the peak value via the resistor R2, the capacitor C2 and the diode D3, so that after two periods the voltages are added at the capacitors C4 and C5 gives four times the peak value of the supply voltage. This voltage is sufficient to ignite the fluorescent lamp LL.
  • a pulsating direct current now flows, which is limited on the AC voltage side by the capacitor C1 and is smoothed and stabilized on the DC voltage side by the capacitors C2 / C3 in conjunction with the resistors R2 / R3.
  • the ballast described above can be used advantageously, for example, in connection with a twilight switch, as shown in FIG. 2, the twilight switch being provided between the AC power supply VAC and the connections A and B of FIG. 1.
  • the twilight switch comprises a phototransistor, two Schmitt triggers, a delay, a rectifier circuit and a power circuit, and works as follows:
  • the 0 volts at the input cause a positive supply voltage at the output, so that the thyristor Thy receives and conducts gate current continuously.
  • the bridge rectifier D10-D13 is switched through and current can flow to the ballast.
  • the resistor R7 which is parallel to the Schmitt triggers, serves to increase the hysteresis generated by the Schmitt trigger, with the result that the lamp which is switched on does not influence the twilight switch.

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  • Rectifiers (AREA)
EP93120361A 1993-12-17 1993-12-17 Ballast redresseur Withdrawn EP0659036A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93120361A EP0659036A1 (fr) 1993-12-17 1993-12-17 Ballast redresseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93120361A EP0659036A1 (fr) 1993-12-17 1993-12-17 Ballast redresseur

Publications (1)

Publication Number Publication Date
EP0659036A1 true EP0659036A1 (fr) 1995-06-21

Family

ID=8213499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120361A Withdrawn EP0659036A1 (fr) 1993-12-17 1993-12-17 Ballast redresseur

Country Status (1)

Country Link
EP (1) EP0659036A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036795A1 (de) * 1970-07-24 1972-01-27 Kaiser W Schaltung zum Zünden und Unterhalten von Gasentladungen
US4463285A (en) * 1982-03-08 1984-07-31 Nilssen Ole K DC Ballasting means for fluorescent lamps
GB2190803A (en) * 1986-05-20 1987-11-25 Yong Kin Michael Ong Light-dependent timer switching system
DE3943305A1 (de) * 1989-12-31 1991-07-04 Lauterbach Rudolf Dipl Ing Fh Daemmerungsschalter mit eigenlicht-immunitaet, zum direkten einbau in aussenleuchten mit leuchtstofflampen z. b. der 7,/ 9,/ 11, w reihe, um bei nacht hausnummern, eingaenge usw. selbstaetig zu beleuchten
DE4016684A1 (de) * 1990-05-23 1991-11-28 Korte Licht Schaltung zum erregen und betreiben mindestens einer entladungslampe
GB2265773A (en) * 1992-04-03 1993-10-06 Hubbell Inc Low loss, electronic ballast for discharge lamps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036795A1 (de) * 1970-07-24 1972-01-27 Kaiser W Schaltung zum Zünden und Unterhalten von Gasentladungen
US4463285A (en) * 1982-03-08 1984-07-31 Nilssen Ole K DC Ballasting means for fluorescent lamps
GB2190803A (en) * 1986-05-20 1987-11-25 Yong Kin Michael Ong Light-dependent timer switching system
DE3943305A1 (de) * 1989-12-31 1991-07-04 Lauterbach Rudolf Dipl Ing Fh Daemmerungsschalter mit eigenlicht-immunitaet, zum direkten einbau in aussenleuchten mit leuchtstofflampen z. b. der 7,/ 9,/ 11, w reihe, um bei nacht hausnummern, eingaenge usw. selbstaetig zu beleuchten
DE4016684A1 (de) * 1990-05-23 1991-11-28 Korte Licht Schaltung zum erregen und betreiben mindestens einer entladungslampe
GB2265773A (en) * 1992-04-03 1993-10-06 Hubbell Inc Low loss, electronic ballast for discharge lamps

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