EP1565042A2 - Elektronisches Vorschaltgerät mit Phasensteuerung zum Dimmen von Leuchtstofflampen - Google Patents

Elektronisches Vorschaltgerät mit Phasensteuerung zum Dimmen von Leuchtstofflampen Download PDF

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Publication number
EP1565042A2
EP1565042A2 EP05101127A EP05101127A EP1565042A2 EP 1565042 A2 EP1565042 A2 EP 1565042A2 EP 05101127 A EP05101127 A EP 05101127A EP 05101127 A EP05101127 A EP 05101127A EP 1565042 A2 EP1565042 A2 EP 1565042A2
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EP
European Patent Office
Prior art keywords
circuit
luminosity
silicon
fluorescent lamp
frequency
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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Withdrawn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
EP05101127A
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English (en)
French (fr)
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EP1565042A3 (de
Inventor
Onn Fah c/o Mass Technology FOO (H.K) Ltd.
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Mass Technology HK Ltd
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Mass Technology HK Ltd
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Publication date
Application filed by Mass Technology HK Ltd filed Critical Mass Technology HK Ltd
Publication of EP1565042A2 publication Critical patent/EP1565042A2/de
Publication of EP1565042A3 publication Critical patent/EP1565042A3/de
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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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation

Definitions

  • This present invention relates to a light modulating device for fluorescent lamps, and in particular to an electronic ballast for fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting and maintaining stable luminosity.
  • the light of fluorescent lamps could be modulated as an incandescent lamp applying a commonly used silicon-controlled light modulator, as shown in FIG. 1.
  • a fluorescent lamp it is not easy for a fluorescent lamp to apply a general silicon-controlled phase-luminosity modulator since it is a non-linear load with a dynatron chara cteristic.
  • studies on applications of silicon-controlled phase-luminosity modulator on adjusting luminosity for fluorescent lamps have been reported on both patent literatures and technical magazines, and related products have been developed.
  • the ballasts in order for the light modulating capacity to reach the stable, uniform and non-flickering levels, the ballasts usually have complicated circuits with numerous components, resulting in high manufactur ing costs and bulky size. Thus it is hard to apply this technology widely. On the other hand, if the circuits are simplified, flickering will result and light will become non-uniform during modulation. It is therefore desirable to find better light modul ating control circuit to improve light modulation technology for fluorescent lamps.
  • a fluorescent lamp applying a silicon-controlled phase-luminosity modulator for adjusting luminosity was disclosed in Chinese Patent No. CN01269679.X. Although the phase-modulating light modulation was accomplished in this light-modulated fluorescent lamp, it is advantageous to enhance the effect and capacity of light modulating.
  • An objective of the present invention is to provide a novel electronic ballast for a fluorescent lamp using a silicon-controlled phase-luminosity modulator to adjust luminosity in order to overcome the shortcomings of prior ballasts with complicated circuits, numerous components, high manufacturing cost, bulky dimensions, difficulties in being applied widely, and frequent flickering and nonuniform light modulation.
  • the present invention provides an electronic ballast for a fluorescent lamp applying silicon-controlled light modulator for adjusting luminosity.
  • the ballast according to the present invention is comprised of:
  • the electronic ballast of the present invention requires only three simple circuits and few components, it can be manufactured at a lower cost with a smaller dimension. With its stable capacity of light modulating, it can be applied easily and widely, especially on the integrated and, compact fluorescent lamps.
  • the electrical ballast of the present invention includes a filter and rectification circuit 1, a frequency control and switch circuit 2, an output circuit 3, a light-modulating signal processing circuit 4 and a direct-current high-voltage stabilization circuit 5.
  • the filter and rectification circuit 1 comprises filter components, ⁇ -shape filter and bridge rectifier. Through the light modulator its input port connects to a municipal alternating current power supply, thereby the high-frequency disturbing wave is filtered out and the input alternating current voltage is transformed as direct current pulse voltage.
  • the filter and rectification circuit shown in FIG. 6 can additionally comprise resistor R18 parallel connected directly to input port, and resistor R19 parallel connected to input port after connecting a capacitor in series. The effect of light modulating will be enhanced based on selecting suitable resistors and capacitors properly, thus allowing more silicon-controlled phase-modulating phase-luminosity modulators to be applicable to more fluorescent lamps capable of light modulating.
  • Frequency control and switch circuit 2 includes an integrated circuit IC, such as type L6574, which controls frequency and produces a switch-triggering signal. Its input port VS connects with the output port of filter and rectification circuit 1 through resistor R3 and provides a working voltage for the IC.
  • Switch transistors Q1, Q2 are composed of two field effect transistors, and their corresponding resistor and capaci tor components are applicable to produce controllable high-frequency, high voltage with the input port connected with the output port of direct-current high voltage stabilization circuit 5 described below.
  • the output circuit 3 comprises inductances and ca pacitors.
  • the connection of its input port and the output port OUT of frequency-control and switch circuit 2 produces resonance and heats up the fluorescent lamp filament to enable normal working of the fluorescent lamp.
  • the light-modulating signal proces sing circuit 4 is novel in this invention. It connects to the output port of filter and rectification circuit 1 and another input port IC-7 of frequency control and switch circuit 2. Consequently, the lower light modulating frequency control voltage on IC, the higher working efficiency on IC.
  • the light modulating signal processing circuit 4 is composed of a voltage divider, configured in series of resistor R1, NPN transistor Q3 and resistor R4, and a voltage control oscillator, composed of voltage stabilization tube Z2, Z3, diode D8, resistors R6, R7, R8, and capacitor C9, and connecting to port IC-7 of the integrated circuit (IC).
  • the sampling point B of light modulating signal processing circuit 4 connects with the output port of filter and rectification circuit 1 and presents as direct-current pulse voltage. It is evident that the virtual value of this voltage is inversely proportional to the light-modulating phase angle of the silicon-controlled phase-luminosity modulator, i.e. the larger is the phase angle, the lower the voltage virtual value. With circuit processing, the larger the phase angle, the lower the output voltage by frequency control and the lower light modulating voltage by frequency control entering the integrated circuit IC and consequently resulted in, higher IC working frequency.
  • NPN transistor Q3 is used in the voltage divider in the circuit.
  • current bias resistor R2 it will provide a resistor changing non-linearly with the voltage at point B, resul ting in non-flickering, uniform and stable light modulating with the sharp changing required on the resistor.
  • N-channel field effect transistor can be used as Q3 in the light-modulating signal processing circuit 4 as shown in FIG. 7.
  • N-channel field effect transistor N-channel MOSFET
  • voltage divider configured in series connecting resistor R1, field effect transistor Q3 and resistor R4, it is feasible to have the desired, sharply non-linearly changed relationship of light modulating phase angle and light modulating frequency-control voltage to enable the light modulation to reach an ideal state.
  • light modulating signal processing circuit 4 is composed of a voltage divider, configured in series connecting resistor R22, N-channel MOSFET Q3 and resistor R24, a voltage control oscillator, composed of voltage stabilization tube Z2, Z3, diode D7, resistors R25, R26, R27, and capacitor C10, and further connects with connection port IC-7 and IC-15 of integrated circuit IC (such as type UBA2014).
  • Light-modulating signal processing circuit 4 can stabilize the working state during the light modulation of the fluorescent lamp without flickering and improve the effects of light modulation.
  • the input port of direct-current high-voltage stabilization circuit 5 is connected with the output port of the filter and rectification circuit 1, and the output port of the latter in turn connects with frequency-control and switch circu it 2.
  • the feedback port is connected with output circuit 3 and then feeds high-frequency electrical energy of output circuit 3 back to the storage capacitor in the direct-current high-voltage stabilization circuit 5.
  • the direct-current high-voltage stabilization circuit 5 is composed of diodes D6 and D7 connected in series, and capacitor C19 with one of its points connecting the point between diodes D6 and D7. It obtains high-frequency energy from one point of C14 with connection to output circuit, and the high-frequency energy through C19 enters storage capacitor C4 after rectification of D6, thus eliminating lamp flickering.
  • the electronic ballast of the present invention additionally includes a frequency-control negative feedback circuit 6.
  • a frequency-control negative feedback circuit 6 With its output port connected to IC-6 of frequency-control and switch circuit 2 and its input port connected to output circuit, the decreasing signals of lamp current is being negatively fed back to integrated circuit IC by frequency control when the current of fluorescent lamp decreases very sharply with modulation.
  • the frequency-control negative feedback circuit 6 comprises a parallel circuit of two RC connected in series (i.e. R16/C18 and R17/C17), R15, diode D11 and Zener diode Z5.
  • the circuit composed of R15, R16, R17, C17 and C18 provides a voltage on IC-6 to reach the threshold voltage required by integrated circuit IC.
  • Lamp current negative feedback circuit is composed of diode D11, Zener diode Z5, R17, and C17. With res istor R15, circuit 6 connects to IC-VS and IC-10 of integrated circuit. It is common knowledge that flickering happens when lamp current decreases very sharply by modulating. Accordingly, the decreased signal of lamp current is fed back negatively to frequency controlled IC, so that flickering can be avoided.
  • the invention relates to an electronic ballast for a fluorescent lamp using a silicon-controlled phase-modulating phase-luminosity modulator. It can be combined with a fluorescent tube as an integrat ed fluorescent lamp, or work as an independent electronic ballast and operates as such after it is connected to a fluorescent lamp. Whether the ballast is integrated or separated, it should be connected to a silicon-controlled phase-modulating phase-luminosity modulator in order to accomplish light modulation, as shown in FIG. 1.
  • the present invention provides for frequency-modulating light modulation.
  • Inductor inductance increases with increased working frequency, hence the current through the lamp tube decreases, and the luminous flux of lamp decreases correspon dingly, thus modulating the brightness of the lamp.
  • the first solution is to alter the change relationship between light-modulating phase angle and light-modulating frequency-control voltage from smooth change to sharp change, i.e. light-modulating frequency-control voltage decreases more quickly when phase angle increases. This means working frequency increases more rapidly to cause current decreases more in the lamp, thus mitigating power supply load, while direct-current high-voltage decreases only slightly. Consequently, it maintains relatively high direct-current voltage.
  • the second solution is that high-frequency energy feedback stabilization provided on direct-current high voltage of electrical ballast causes direct-current high voltage of light modulation to increase with certain degree of compensation.
  • the third solution is that the lamp flickering can be prevented by the frequency negative feedback circuit set for avoiding twinkling caused by resonance from sharp decrease of lamp current when the light is being modulated too fast.
  • the first special circuit is light modulating signal processing circuit 4 used to obtain ideal relationship curve of light-modulating phase angle and light-modulating frequency-control voltage.
  • the wave shape of input voltage transferred to fluorescent lamp through controllable phase-modulating light modulator takes on a tangent phase angle shape, this means that the larger the tangent phase angle, the lower the virtual voltage transferred to fluorescent lamp whether the light-modulating phase angle increases. Therefore, light-modulating phase angle is inversely proportional to input virtual voltage.
  • input voltage at point B takes on the same shape as input voltage waveform but only positive, and twice as high as input voltage.
  • B is a sampling point for a light modulating signal
  • virtual voltage of B is inversely proportional to light-modulating phase angle.
  • R1, Q3, and R4 the electrical signal becomes a voltage divider.
  • a NPN transistor Q3 connecting current bias resistor R2 forms a resistor with non-linear change with voltage at point B. Thus, a sharply change in this resistor is needed.
  • FIG. 4 shows the curve relationship of light-modulating phase angle and light-modulating voltage on frequency control (Line 1) and light-modulating phase angle and direct-current high voltage (Line 2) using a NPN transistor as a non-linear resistor in light-modulating signal processing circuit.
  • NPN transistor Q3 As a non-linearly changed resistor in light-modulating signal processing circuit 4, a NPN transistor Q is replaced by a general linear resistor (23 ° phase angle). The results are shown in FIG. 5.
  • frequency-control voltage is 0.2V (point M in FIG.
  • the second special circuit is a direct-current high-voltage stabilization circuit composed of C19, D6 and D7.
  • the high-frequency feedback energy out of one point of capacitor C14 supplies energy to electrolysis capacitor C4 through rectification of D6.
  • Reduction of fluorescent lamp flickering is achieved by properly adjusting energy feedback amount (i.e. adjusting the capacitance of C19 capacitor) to prevent the divi ded voltage of electrolysis capacitor to decrease too fast due to light modulation. This stabilizes direct-current high voltage.
  • the third special circuit is a control negative feedback circuit 6. It is feasible to apply negative feedback to prevent fluor escent lamp flickering due to sudden quick frequency changes when light modulation is too fast.
  • sampling of feedback signal is derived from the sharp changes of current through the lamp tube. The current changes are being transformed to voltage changes, and then transferred to IC, resulting in negative feedback on frequency change.
  • lamp current runs through D11, C17, R17 and Z5, and a direct-current voltage value corresponding to current value is formed on R17.
  • a required threshold voltage suitable for IC comprises R15, R16, R17 and C17, C18. It is therefore possible to accomplish frequency-control negative feedback with superposition of above two voltages to IC.

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP05101127A 2004-02-17 2005-02-15 Elektronisches Vorschaltgerät mit Phasensteuerung zum Dimmen von Leuchtstofflampen Withdrawn EP1565042A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200420003182 2004-02-17
CN200420003182 2004-02-17
CN200410100898 2004-12-13
CNB2004101008986A CN100566500C (zh) 2004-02-17 2004-12-13 一种应用可控硅调光器调光的荧光灯电子镇流器

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EP1565042A2 true EP1565042A2 (de) 2005-08-17
EP1565042A3 EP1565042A3 (de) 2006-01-25

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EP05101127A Withdrawn EP1565042A3 (de) 2004-02-17 2005-02-15 Elektronisches Vorschaltgerät mit Phasensteuerung zum Dimmen von Leuchtstofflampen

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EP (1) EP1565042A3 (de)
JP (1) JP2005235761A (de)
KR (1) KR20060066574A (de)
CN (1) CN100566500C (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1725085A1 (de) * 2005-05-20 2006-11-22 Mass Technology (H.K.) Ltd. Dimmbares Vorschaltgerät zur schrittweisen Regelung von Leuchtstofflampen
EP1965611A1 (de) 2007-03-02 2008-09-03 Mass Technology (H.K.) Ltd. Stufenlose dimmbare fluoreszierende Lampe und Vorschaltgerät
CN102355787A (zh) * 2011-08-08 2012-02-15 杭州电子科技大学 基于uba2211的变频调光方法与电路
US8305013B2 (en) 2010-07-12 2012-11-06 O2Micro International Limited Circuits and methods for controlling dimming of a light source
US8330388B2 (en) 2008-12-12 2012-12-11 O2Micro, Inc. Circuits and methods for driving light sources
US8339063B2 (en) 2010-03-04 2012-12-25 O2Micro Inc Circuits and methods for driving light sources
US8339067B2 (en) 2008-12-12 2012-12-25 O2Micro, Inc. Circuits and methods for driving light sources
US8378588B2 (en) 2008-12-12 2013-02-19 O2Micro Inc Circuits and methods for driving light sources
US8378589B2 (en) 2008-12-12 2013-02-19 O2Micro, Inc. Driving circuit with dimming controller for driving light sources
US8482219B2 (en) 2008-12-12 2013-07-09 O2Micro, Inc. Driving circuit with dimming controller for driving light sources
US8508150B2 (en) 2008-12-12 2013-08-13 O2Micro, Inc. Controllers, systems and methods for controlling dimming of light sources
US8698419B2 (en) 2010-03-04 2014-04-15 O2Micro, Inc. Circuits and methods for driving light sources
US8866398B2 (en) 2012-05-11 2014-10-21 O2Micro, Inc. Circuits and methods for driving light sources
US9030122B2 (en) 2008-12-12 2015-05-12 O2Micro, Inc. Circuits and methods for driving LED light sources
US9232591B2 (en) 2008-12-12 2016-01-05 O2Micro Inc. Circuits and methods for driving light sources
US9253843B2 (en) 2008-12-12 2016-02-02 02Micro Inc Driving circuit with dimming controller for driving light sources
US9386653B2 (en) 2008-12-12 2016-07-05 O2Micro Inc Circuits and methods for driving light sources

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101547547A (zh) 2008-03-28 2009-09-30 马士科技有限公司 可调光的荧光灯镇流器
EP2478748B1 (de) * 2009-09-18 2014-11-12 Koninklijke Philips N.V. Elektronisches vorschaltgerät mit dimmerschaltung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382881A (en) * 1992-12-28 1995-01-17 North American Philips Corporation Ballast stabilization circuitry for eliminating moding or oscillation of the current envelope in gas discharge lamps and method of operating
US5872429A (en) * 1995-03-31 1999-02-16 Philips Electronics North America Corporation Coded communication system and method for controlling an electric lamp
US6020689A (en) * 1997-04-10 2000-02-01 Philips Electronics North America Corporation Anti-flicker scheme for a fluorescent lamp ballast driver
CN2490788Y (zh) * 2001-06-11 2002-05-08 李秋红 镇流器
CN2515919Y (zh) * 2001-12-05 2002-10-09 马士科技有限公司 可与可控硅调相调光器配合使用的可调光荧光灯装置
CN2765432Y (zh) * 2004-12-13 2006-03-15 马士科技有限公司 应用可控硅调光器调光的荧光灯电子镇流器

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1725085A1 (de) * 2005-05-20 2006-11-22 Mass Technology (H.K.) Ltd. Dimmbares Vorschaltgerät zur schrittweisen Regelung von Leuchtstofflampen
EP1965611A1 (de) 2007-03-02 2008-09-03 Mass Technology (H.K.) Ltd. Stufenlose dimmbare fluoreszierende Lampe und Vorschaltgerät
US9030122B2 (en) 2008-12-12 2015-05-12 O2Micro, Inc. Circuits and methods for driving LED light sources
US9386653B2 (en) 2008-12-12 2016-07-05 O2Micro Inc Circuits and methods for driving light sources
US9253843B2 (en) 2008-12-12 2016-02-02 02Micro Inc Driving circuit with dimming controller for driving light sources
US8330388B2 (en) 2008-12-12 2012-12-11 O2Micro, Inc. Circuits and methods for driving light sources
US8339067B2 (en) 2008-12-12 2012-12-25 O2Micro, Inc. Circuits and methods for driving light sources
US8378588B2 (en) 2008-12-12 2013-02-19 O2Micro Inc Circuits and methods for driving light sources
US8378589B2 (en) 2008-12-12 2013-02-19 O2Micro, Inc. Driving circuit with dimming controller for driving light sources
US8482219B2 (en) 2008-12-12 2013-07-09 O2Micro, Inc. Driving circuit with dimming controller for driving light sources
US8508150B2 (en) 2008-12-12 2013-08-13 O2Micro, Inc. Controllers, systems and methods for controlling dimming of light sources
US9232591B2 (en) 2008-12-12 2016-01-05 O2Micro Inc. Circuits and methods for driving light sources
US8339063B2 (en) 2010-03-04 2012-12-25 O2Micro Inc Circuits and methods for driving light sources
US8698419B2 (en) 2010-03-04 2014-04-15 O2Micro, Inc. Circuits and methods for driving light sources
US8890440B2 (en) 2010-03-04 2014-11-18 O2Micro, Inc. Circuits and methods for driving light sources
US8664895B2 (en) 2010-03-04 2014-03-04 O2Micro, Inc. Circuits and methods for driving light sources
US8305013B2 (en) 2010-07-12 2012-11-06 O2Micro International Limited Circuits and methods for controlling dimming of a light source
CN102355787B (zh) * 2011-08-08 2013-09-25 杭州电子科技大学 基于uba2211的变频调光方法与电路
CN102355787A (zh) * 2011-08-08 2012-02-15 杭州电子科技大学 基于uba2211的变频调光方法与电路
US8866398B2 (en) 2012-05-11 2014-10-21 O2Micro, Inc. Circuits and methods for driving light sources

Also Published As

Publication number Publication date
JP2005235761A (ja) 2005-09-02
CN1722929A (zh) 2006-01-18
CN100566500C (zh) 2009-12-02
EP1565042A3 (de) 2006-01-25
KR20060066574A (ko) 2006-06-16

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