EP1565042A2 - Electronic ballast for fluorescent lamp using silicon-controlled phase-luminosity modulator for adjusting luminosity - Google Patents
Electronic ballast for fluorescent lamp using silicon-controlled phase-luminosity modulator for adjusting luminosity Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- luminosity
- silicon
- fluorescent lamp
- frequency
- 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.)
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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.
Abstract
Description
Claims (13)
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity comprising in combination:(i) a filter and rectification circuit, connectable with an alternating current power and having an output port;(ii) a frequency control and switch circuit, including an integrated circuit (IC) which controls frequency and produces switch-triggering signals, two switch transistors Q1, Q2 and the corresponding resistors and capacitors and having an output port and an input port;(iii) an output circuit, including inductances and capacitors, with its input port connecting with the output port of said frequency control and switch circuit;(iv) a light-modulating signal processing circuit connecting with the output port of said filter and rectification circuit and the input port of said frequency control and switch circuit; and(v) a direct-current, high voltage stabilization circuit with its input port connecting with the output port of said filter and rectification circuit, an output connecting with the input port of frequency control and a switch circuit, and feedback port connecting with said output circuit.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, including a frequency-control negative-feedback circuit with its output port connecting with the IC of the frequency control and switch circuit, and input port connecting with the output circuit.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein the light modulating signal processing circuit includes a voltage divider and a voltage control oscillator, wherein said voltage divider is set up by connecting resistor R1, NPN transistor Q3 and resistor R4 in series and wherein said voltage control oscillator is composed of connected voltage stabilization tube Z2, Z3, diode D8, resistors R6, R7, R8, capacitor C9 and a connecting point with the integrated circuit (IC).
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 3, wherein said NPN transistor Q3 is used as a N-channel field effect transistor (N-channel MOS FET).
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein said direct-current high-voltage stabilization circuit comprises diodes D6 and D7 connected in series and capacitor C19 with one point of C19 connected to a point between D6 and D7, and another point of C19 connected to the output circuit.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein the frequency-control negative-feedback circuit comprises a parallel circuit of two RC in series, R15, diode D11 and Zener diode Z5, whereby said parallel circuit of said two RC in series includes R16/C18 and R17/C17, and said lamp current negative feedback circuit includes diode D11, Zener diode Z5, resistor R17 and capacitor C17.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein the type of integrated circuit IC is L6574.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein the type of integrated circuit IC is UBA2014.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 1, wherein the filter and rectification circuit comprises filter components, π-shape filter and bridge rectifier, whereby said input port is connected to a municipal alternating current power supply with light modulator.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 9, wherein the filter and rectification circuit further comprises resistor R18 connected in parallel directly with input port, and resistor R19 connected in parallel with input port aft er connecting capacitor in series.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 2, wherein the light modulating signal processing circuit includes a voltage divider and a voltage control oscillator, wherein said voltage divider is set up by connecting resistor R1, NPN transistor Q3 and resistor R4 in series and wherein said voltage control oscillator is composed of connected voltage stabilization tube Z2, Z3, diode D8, resistors R6, R7, R8, capacitor C9 and a connecting point with the integrated circuit (IC).
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 2, wherein said direct-current high-voltage stabilization circuit comprises diodes D6 and D7 connected in series and capacitor C19 with one point of C19 connected to a point between D6 and D7, and another point of C19 connected to the output circuit.
- An electronic ballast of a fluorescent lamp using a silicon-controlled phase-luminosity modulator for adjusting luminosity of claim 2, wherein the frequency-control negative-feedback circuit comprises a parallel circuit of two RC in series, R15, diode D11 and Zener diode Z5, whereby said parallel circuit of said two RC in series includes R16/C18 and R17/C17, and said lamp current negative feedback circuit includes diode D11, Zener diode Z5, resistor R17 and capacitor C17.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200420003182 | 2004-02-17 | ||
CN200420003182 | 2004-02-17 | ||
CNB2004101008986A CN100566500C (en) | 2004-02-17 | 2004-12-13 | A kind of electronic ballast for fluoresent lamp of using silicon controlled dimmer for light control |
CN200410100898 | 2004-12-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1565042A2 true EP1565042A2 (en) | 2005-08-17 |
EP1565042A3 EP1565042A3 (en) | 2006-01-25 |
Family
ID=34701724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05101127A Withdrawn EP1565042A3 (en) | 2004-02-17 | 2005-02-15 | Electronic ballast for fluorescent lamp using silicon-controlled phase-luminosity modulator for adjusting luminosity |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1565042A3 (en) |
JP (1) | JP2005235761A (en) |
KR (1) | KR20060066574A (en) |
CN (1) | CN100566500C (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1725085A1 (en) * | 2005-05-20 | 2006-11-22 | Mass Technology (H.K.) Ltd. | Stepped dimming ballast for fluorescent lamps |
EP1965611A1 (en) | 2007-03-02 | 2008-09-03 | Mass Technology (H.K.) Ltd. | Stepless dimming fluorescent lamp and ballast thereof |
CN102355787A (en) * | 2011-08-08 | 2012-02-15 | 杭州电子科技大学 | Method and circuit for variable frequency dimming based on UBA2211 |
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 |
US8378589B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro, Inc. | Driving circuit with dimming controller for driving light sources |
US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101547547A (en) | 2008-03-28 | 2009-09-30 | 马士科技有限公司 | Dimmable fluorescent lamp ballast |
JP5639177B2 (en) * | 2009-09-18 | 2014-12-10 | コーニンクレッカ フィリップス エヌ ヴェ | Electronic ballast dimming circuit |
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EP0605052A1 (en) * | 1992-12-28 | 1994-07-06 | Koninklijke Philips Electronics N.V. | Ballast for gas discharge lamps |
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 |
-
2004
- 2004-12-13 CN CNB2004101008986A patent/CN100566500C/en not_active Expired - Fee Related
-
2005
- 2005-02-14 JP JP2005036903A patent/JP2005235761A/en not_active Withdrawn
- 2005-02-15 EP EP05101127A patent/EP1565042A3/en not_active Withdrawn
- 2005-02-17 KR KR1020050013024A patent/KR20060066574A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0605052A1 (en) * | 1992-12-28 | 1994-07-06 | Koninklijke Philips Electronics N.V. | Ballast for gas discharge lamps |
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 |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1725085A1 (en) * | 2005-05-20 | 2006-11-22 | Mass Technology (H.K.) Ltd. | Stepped dimming ballast for fluorescent lamps |
EP1965611A1 (en) | 2007-03-02 | 2008-09-03 | Mass Technology (H.K.) Ltd. | Stepless dimming fluorescent lamp and ballast thereof |
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 |
US8378589B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro, Inc. | Driving circuit with dimming controller for driving light sources |
US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods 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 (en) * | 2011-08-08 | 2013-09-25 | 杭州电子科技大学 | Method and circuit for variable frequency dimming based on UBA2211 |
CN102355787A (en) * | 2011-08-08 | 2012-02-15 | 杭州电子科技大学 | Method and circuit for variable frequency dimming based on UBA2211 |
US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
Also Published As
Publication number | Publication date |
---|---|
CN100566500C (en) | 2009-12-02 |
CN1722929A (en) | 2006-01-18 |
EP1565042A3 (en) | 2006-01-25 |
JP2005235761A (en) | 2005-09-02 |
KR20060066574A (en) | 2006-06-16 |
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