EP0831677A2 - Ballast électronique pour lampe à décharge - Google Patents

Ballast électronique pour lampe à décharge Download PDF

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Publication number
EP0831677A2
EP0831677A2 EP97304183A EP97304183A EP0831677A2 EP 0831677 A2 EP0831677 A2 EP 0831677A2 EP 97304183 A EP97304183 A EP 97304183A EP 97304183 A EP97304183 A EP 97304183A EP 0831677 A2 EP0831677 A2 EP 0831677A2
Authority
EP
European Patent Office
Prior art keywords
circuit
fluorescent lamp
ballast
electronic ballast
diode
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Withdrawn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
EP97304183A
Other languages
German (de)
English (en)
Other versions
EP0831677A3 (fr
Inventor
Onn Fah Foo
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.)
Mass Technology HK Ltd
Original Assignee
Mass Technology HK Ltd
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 Mass Technology HK Ltd filed Critical Mass Technology HK Ltd
Publication of EP0831677A2 publication Critical patent/EP0831677A2/fr
Publication of EP0831677A3 publication Critical patent/EP0831677A3/fr
Withdrawn legal-status Critical Current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
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters

Definitions

  • This invention relates to an operating circuit for a fluorescent lamp, and especially to an electronic ballast for a fluorescent lamp.
  • An AC-DC-AC transformation is adopted in all existing electronic ballasts for fluorescent lamps, which, through converting civil power supply into tens of kilohertz high frequency power, initiates the fluorescent lamp.
  • This kind of electronic ballast usually includes a rectifier circuit, a filtering circuit, a high frequency generating and control circuit as well as a starting circuit for the fluorescent tube (see Fig. 1).
  • an electrolytic capacitor with a large capacitance is used in the filtering circuit (see Fig. 2), the conduction angle of the rectifier diode is very small. Its waveform appears as discrete pulses as shown in Fig. 3, hence its power factor is very low, and usually falls in the range between 0.5 and 0.6.
  • the harmonic of the current in this kind of ballast is large and may contaminate the electrical power network. If a large amount of this kind of ballast is used in three phase power supply lines, then a large neutral current will be caused in the power lines, so as to cause potential harm to the safety of the power network.
  • the operating method in this kind of ballast cannot protect the electronic ballast against shocking due to the surge current in the power network from switching on the fluorescent lamp. It is subject to the breakdown of the electronic elements of the ballast.
  • the purpose of this invention is to provide an electronic ballast for a fluorescent lamp with a high power factor, the capability of reducing the harmonic interference to the power network and security of operation.
  • an electronic ballast for a fluorescent lamp includes: a rectifier circuit and a filtering circuit used for converting a civil power supply into DC power, a high frequency generating and control circuit used for providing operating power to the fluorescent lamp by converting the DC power to a high frequency power source, a starting circuit used to initiate the fluorescent lamp as well as a main and an auxiliary current uninterrupted circuit connected between the rectifier circuit and the filtering circuit, used to increase the power factor of the ballast and to suppress the harmonic interference.
  • the addition of the main and the auxiliary current uninterrupted circuits between the rectifier circuit and the filtering circuit makes the input current continuous and follows the variation with the input voltage, hence the power factor of the ballast is increased while post high frequency generating and control circuit tends to be stable in operation.
  • the interference of the harmonic current in the ballast will be suppressed effectively, the contamination of the power network will be reduced and the electrical security of operation will be enhanced.
  • the conduction interference of the radiating frequency for the ballast is able to meet the standard stipulated by the IEC.
  • the current is rectified and filtered to produce a DC signal.
  • This DC signal is used to drive the high frequency switching circuit, and also provides the power that is switched to drive the lamp.
  • the effect of this is that current only flows when the magnitude of the input voltage is greater than the DC voltage, forward biasing the rectified diodes.
  • Fig. 4 and Fig. 5 show the block diagram and the electric circuit diagram respectively of a fluorescent lamp according to one embodiment of this invention.
  • the electronic ballast for a fluorescent lamp includes a rectifier circuit 11, an auxiliary current-uninterrupted circuit 13, a main current-uninterrupted circuit 14, a filtering circuit 16, a high frequency generating and control circuit 17 and a starting circuit for initiating a fluorescent tube 18.
  • the rectifier circuit 11, the filtering circuit 16, the high frequency generating and control circuit 17 and the starting circuit 18 can adopt the circuit of the prior art, i.e.
  • the rectifier circuit 11 includes a bridge rectifier which is composed of diodes D1 to D4;
  • the filtering circuit 16 includes an electrolytic capacitor C;
  • the high frequency generating and control circuit 17 includes transistors BG1 and BG2, diodes D6 to D9, resistors R1 to R6, capacitors C4 to C6 and inductors L3 to L6.
  • the diodes D6 and D7 are connected in parallel to the electrolytic capacitor C, i.e. between the point F and the ground as shown in the Figure.
  • the capacitor C4 is connected between the point F and the joint point G of the diode D6 and D7.
  • the collector is connected to the point F
  • the emitter is connected to the point G
  • the base is connected to the point F via the resistor R3, and connected to the point G via the resistor R5 and the diode D9 connected in series and the resistor R1, the capacitor C5 and the inductor L5 connected in series respectively.
  • the collector is connected to the point G
  • the emitter is connected to the ground
  • the base is connected to the point G via the resistor R4, and connected to the ground via the resistor R6 and the diode D8 connected in series as well as the R2, the capacitor C6 and the inductor L6 connected in series respectively.
  • the inductors L3 and L4 are connected in series between point G and one pin of the fluorescent tube Y.
  • the starting circuit for the fluorescent tube 18 includes a capacitor C7 which is connected between two pins of the fluorescent tube Y.
  • the auxiliary current uninterrupted-circuit 13 includes an inductor L1 and a capacitor C1 connected in series. Its two ends A and D (i.e., the ground) are connected across the output of the rectifier circuit 11.
  • the main current uninterrupted-circuit 14 includes an inductor L2 (its inductance ⁇ 10mH, e.g., 5mH), capacitors C2, C3 (their capacitance ⁇ 0.1 ⁇ F, e.g., 0.01 ⁇ F, proof voltage ⁇ 400V) and a diode D5 (e.g. FR-104 fast recovery diode, the proof voltage ⁇ 400V).
  • One end of the inductor L2 is connected to the joint of the inductor L1 and the capacitor C1 (point B) and the other end is connected to the anode of the diode D5.
  • the cathode of the diode D5 is connected to the point F.
  • the capacitors C2 and C3 are connected in series between the joint of the inductor L2 and the diode D5 (point C) and the ground.
  • the joint of the capacitors C2 and C3 (point E) is connected to a pin of the fluorescent tube Y.
  • the phase of the envelope wave of iL 2 is the same as that of U BD , i.e. AC input voltage and current are the same phase.
  • a circuit according to the embodiment of the invention described above enables the conduction angle of the diodes D1 to D4 in the rectifier circuit 11 to increase, so that the waveform of the input current tends to be continuous instead of the original waveform which is in discrete and sharp pulses, and close to sinusoidal waveform as shown in Fig. 6.
  • it can protect the ballast from shocking due to surge current from switching on the fluorescent lamp, on the other hand, it can suppress the contamination to the power network due to the harmonic current of the ballast.
  • its power factor can be 0.95 - 1 and its total harmonic distortion THD of the current is approximately 10%.
  • Fig. 7 shows a conducting interference chart of the radiation frequency of the electronic ballast for a fluorescent lamp according to this invention, and the chart shows that it meets the standard stipulated by the IEC.
  • the above mentioned is only one preferred embodiment of the invention. According to the concept of this invention, various modifications and transformation can be made by those skilled persons.
  • the main and the auxiliary current-uninterrupted circuits of this invention can be also connected between the rectifier circuit and the high frequency generating and control circuit.
  • the main and auxiliary current uninterrupted circuits of this invention can be also used for other various ordinary electronic ballast. Such modifications are all within the scope of this invention.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP97304183A 1996-09-24 1997-06-16 Ballast électronique pour lampe à décharge Withdrawn EP0831677A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN96119956 1996-09-24
CN96119956A CN1113583C (zh) 1996-09-24 1996-09-24 荧光灯电子镇流器

Publications (2)

Publication Number Publication Date
EP0831677A2 true EP0831677A2 (fr) 1998-03-25
EP0831677A3 EP0831677A3 (fr) 1998-10-14

Family

ID=5126046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97304183A Withdrawn EP0831677A3 (fr) 1996-09-24 1997-06-16 Ballast électronique pour lampe à décharge

Country Status (3)

Country Link
EP (1) EP0831677A3 (fr)
CN (1) CN1113583C (fr)
AU (1) AU737784B2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003049507A1 (fr) * 2001-12-05 2003-06-12 Mass Technology (H.K.) Ltd. Dispositif de lampe fluorescente a luminosite reglable destine a etre utilise de maniere coordonnee avec un modulateur de luminosite de phase commande au silicium
EP1345311A2 (fr) * 2002-03-15 2003-09-17 VLM S.p.A. Réactance à facteur de puissance élevé pour lampe à décharge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4400125B2 (ja) * 2003-07-30 2010-01-20 ウシオ電機株式会社 ショートアーク型放電ランプ点灯装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395776B1 (fr) * 1989-05-02 1994-03-02 Siemens Aktiengesellschaft Ballast électrique
EP0621743A1 (fr) * 1993-04-23 1994-10-26 Koninklijke Philips Electronics N.V. Circuit pour améliorer le facteur de puissance
WO1996007297A2 (fr) * 1994-08-22 1996-03-07 Philips Electronics N.V. Configuration de circuit pour lampe a decharge comprenant un convertisseur de courant continu en courant alternatif et un circuit de resonance

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355055A (en) * 1992-08-21 1994-10-11 Ganaat Technical Developments Ltd. Lighting assembly and an electronic ballast therefor
CN2191515Y (zh) * 1994-04-26 1995-03-08 张卫星 日光灯电子镇流器
CN2221711Y (zh) * 1995-07-19 1996-03-06 深圳华源实业股份有限公司 电子节能灯

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395776B1 (fr) * 1989-05-02 1994-03-02 Siemens Aktiengesellschaft Ballast électrique
EP0621743A1 (fr) * 1993-04-23 1994-10-26 Koninklijke Philips Electronics N.V. Circuit pour améliorer le facteur de puissance
WO1996007297A2 (fr) * 1994-08-22 1996-03-07 Philips Electronics N.V. Configuration de circuit pour lampe a decharge comprenant un convertisseur de courant continu en courant alternatif et un circuit de resonance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VERDERBER R R ET AL: "HARMONICS FROM COMPACT FLUORESCENT LAMPS" PROCEEDINGS OF THE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, DEARBORN, SEPT. 28 - OCT. 1, 1991, vol. VOL. 2, no. -, 28 September 1991, pages 1853-1858, XP000299694 INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003049507A1 (fr) * 2001-12-05 2003-06-12 Mass Technology (H.K.) Ltd. Dispositif de lampe fluorescente a luminosite reglable destine a etre utilise de maniere coordonnee avec un modulateur de luminosite de phase commande au silicium
EP1345311A2 (fr) * 2002-03-15 2003-09-17 VLM S.p.A. Réactance à facteur de puissance élevé pour lampe à décharge
EP1345311A3 (fr) * 2002-03-15 2005-04-13 VLM S.p.A. Réactance à facteur de puissance élevé pour lampe à décharge

Also Published As

Publication number Publication date
AU1256397A (en) 1998-03-26
CN1192646A (zh) 1998-09-09
EP0831677A3 (fr) 1998-10-14
CN1113583C (zh) 2003-07-02
AU737784B2 (en) 2001-08-30

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