EP0978221B1 - Schaltungsanordnung zum dimmbaren betrieb einer leuchtstofflampe - Google Patents
Schaltungsanordnung zum dimmbaren betrieb einer leuchtstofflampe Download PDFInfo
- Publication number
- EP0978221B1 EP0978221B1 EP98924143A EP98924143A EP0978221B1 EP 0978221 B1 EP0978221 B1 EP 0978221B1 EP 98924143 A EP98924143 A EP 98924143A EP 98924143 A EP98924143 A EP 98924143A EP 0978221 B1 EP0978221 B1 EP 0978221B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arrangement according
- circuit arrangement
- frequency
- switches
- circuit
- 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.)
- Expired - Lifetime
Links
- 230000010355 oscillation Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 6
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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
- H05B41/282—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 with semiconductor devices
- H05B41/2821—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 with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
- H05B41/2822—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 with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
-
- 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
- H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/04—Dimming circuit for fluorescent lamps
Definitions
- the invention relates to a circuit arrangement for dimmable Operation of a fluorescent lamp, in particular for use in Motor vehicles as instrument lighting. From a standing start Corresponding circuit arrangements are known in the art, where the fluorescent lamp is operated at an operating frequency becomes. By switching the operating frequency on and off with one device and thus the lamp with one Dimming frequency, which is above the human's visual frequency Eye lies, that is achieved for the human eye The impression arises that the fluorescent lamp is of different brightness, depending on the pulse width of the dimming frequency.
- Such a circuit arrangement is known from JP-A-06333695. To the lamp current by the fluorescent lamp, it is necessary to either to provide an additional controller or to use an elaborately stabilized resonant circuit.
- the object of the invention is therefore to provide a simple structure Specify circuitry for dimming a fluorescent lamp.
- a particularly simple push-pull converter is replaced by one Resonant circuit consisting of a capacitance and an inductor, which is connected to a first pole of the supply voltage.
- the oscillating circuit is alternately direct or via two switches via a third switch with the second pole of the supply voltage connectable.
- the two switches are each with one connection the connections of the capacitance and / or the inductance are connected.
- fluorescent lamps can either be parallel to the inductance and / or capacitance can be arranged or via a transformer are supplied with the operating frequency, the primary winding of the Transformer advantageously forms the inductance of the resonant circuit.
- circuit arrangement according to claim 5 is a circuit arrangement realized with few components.
- the circuit arrangement according to claim 6 gives a particularly effective Regulation of the lamp current, which is nevertheless simple and with few Components is built.
- the positive feedback device in the form of a coil on the same bobbin how the inductance is applied can be done easily and simultaneously with the inductor.
- the lamp current setpoint depends on the temperature the fluorescent lamp or the environment is specified, a Minimum brightness reached even at low temperatures.
- Circuit arrangements according to the invention of particularly simple construction are given in claims 9 and 12.
- a microprocessor for the control device the possibly even for other tasks, for example in an instrument cluster a motor vehicle is present and the invention Brightness control used for instrument lighting the circuit can be implemented with little component effort.
- the circuit with a separate microprocessor or be realized by means of switching gates.
- the switch before or at the beginning of the pulse sequence pause can be in the resonant circuit contained current short-circuited and so an afterglow of the Fluorescent lamp can be prevented safely.
- a Ballast choke between a pole of the supply voltage and the The circuit can additionally stabilize the oscillating circuit and are kept sinusoidal.
- the push-pull converter from FIG. 1 has an oscillating circuit consisting of the capacitor C and the coil L, which is connected directly to the positive supply voltage and can be connected via the transistors S1, S2 alternately to the ground potential via the series reactor Lv and the transistor S3.
- the following description assumes that the transistor S3 is turned on, that is to say that the transistors S1, S2 are connected to the second pole of the supply voltage.
- the voltage is also coupled through the coil L1, which is wound on the same coil former as the coil L, and the alternating voltage that occurs alternately blocks the transistors S1, S2 with the oscillation frequency of the resonant circuit.
- the operating point of the two transistors S1, S2 is set via the resistor R.
- the resonant circuit transmits its energy via the transformer, which is formed from the coils L, L1 and L2, to the lamp circuit which, in addition to the coil L2, also has the fluorescent lamp KL, the impedance Z and a shunt SH.
- the voltage is tapped between the fluorescent lamp KL and the shunt SH and fed to the rectifier G.
- the rectified voltage U1 is present at the minus input of the comparator K.
- the square wave voltage U3 of the frequency f3 at the output of the comparator K1 is changed in its pulse width W3.
- the current setpoint can be set by the level of the triangular voltage can be set in Figure 2b.
- the output voltage U3 of the comparator K1 is connected to an input of the AND gate A led while to the second input of the AND gate A the dimming frequency f2 is set with the voltage curve U4 ( Figure 2a).
- the dimming frequency f2 is rectangular and its pulse width W2 also changeable.
- the pulse width W2 of the dimming frequency f2 is determined the duty cycle of the push-pull converter and thus the fluorescent lamp KL, as will be described in more detail later.
- the Pulse width W2 of the dimming frequency f2 is e.g. either automatically depending the ambient brightness or manually depending on the desired Brightness of the fluorescent lamp KL adjustable.
- the voltage U5 is present at the output of the AND gate A: It points during the pulse width W2 of the dimming frequency f2 switching pulses of the pulse width W3 with the switching frequency f3.
- the transistor S3 is turned on the switching pulses are controlled with the pulse width W3.
- the transistor S3 With the first pulse with the pulse width W3 during a pulse width W2 Dimming frequency f2, the transistor S3 is turned on.
- the current IB can flow from the supply voltage source + UB into the time Resonant circuit flow.
- the resonant circuit begins at its resonance frequency to swing.
- the resonant circuit oscillates further and the current stored in the resonant circuit flows through the series choke Lv and the diode D connected as a freewheeling diode in the Resonant circuit back, but decreases accordingly.
- transistor S3 switches through again: current can flow out of the Supply voltage source + UB flow into the resonance circuit and the Current IB increases during the duty cycle.
- the current fluctuates during the pulse width W2 of the dimming frequency f2 around its mean IM ( Figure 2 f). With increasing or decreasing Pulse width W3 is increased or current IB reduced and the lamp current IL via the transformer. If the pulse width W2 of the dimming frequency f2 has ended and the last pulse the pulse sequence of frequency f3 at transistor t4 at time t4 has transistor S3 during the pause time P of the frequency f2 locked. The resonant circuit vibrates due to its load by the lamp KL and own losses, which become currents IB and IL back to 0 and the fluorescent lamp goes out. With the beginning of the next Pulse of the dimming frequency f2, it begins to light up again previously described. Since the dimming frequency f2 is above human The fluorescent lamp appears to the human eye depending on the pulse width W2 differently bright.
- the fluorescent lamp KL can with a sufficiently large supply voltage also in the primary circuit e.g. arranged parallel to the capacitor C. are so that the secondary coil L2 can be dispensed with. Furthermore, the voltage can also be set via a shunt in the primary circuit can be tapped for the rectifier G.
- the circuit from FIG. 3 also has an oscillating circuit from the capacitor C and the coil L on that with the positive supply voltage is connected and alternately via transistors S4, S5 is connectable to ground potential.
- the control device SE is via a control line SL1, SL2 with the base of the transistors S4, S5 connected.
- the dimming frequency f2 (FIG. 4a) with the pulse sequences controlled with the switching frequency f3 alternately, the duration T5 of the individual contiguous pulses for a transistor S4, S5 half of the oscillation period T1 of the resonant circuit is ( Figure 4b, c).
- the resonant circuit oscillates almost sinusoidally, so that only small disturbing harmonics occur. Therefore it is also advantageous if the oscillation period T of the resonance frequency is an even multiple the oscillation period T3 is the switching frequency f3.
- the oscillation period T1 of the resonant circuit corresponds to four times the oscillation period T3 of the individual pulses.
- the pulse width W3 of the individual pulses becomes the average current IM in the primary circuit and thus also the lamp current IL in the secondary circuit.
- the dimming frequency f2 is only present internally in the control device SE.
- Your pulse width W2 determines the duty cycle of the resonant circuit and so that the duty cycle of the fluorescent lamp KL.
- the one shown in Figure 3 Circuit corresponds to a control. Individuals can do this Pulse width values W2 of the dimming frequency f2 for various desired ones Brightnesses and / or operating temperatures in the storage devices be stored, which are directly present in the memory device SE or which the control device SE can access.
- FIG. 5 shows a fluorescent lamp L, which is connected to a high-voltage capacitor Z with the secondary circuit L2 of a transformer.
- the transformer is energized in its primary circuit L by two push-pull switching MOSFET transistors S6 and S7, which are controlled by a control device SL, the primary circuit L of the transformer being connected to the operating voltage U B at the same time.
- Each gate G of the transistors S6, S7 is connected to the control device SL.
- the drain D of each transistor S6, S7 leads to the primary winding L of the transformer, the sources S of the MOSFET transistors S6, S7 leading together to a shunt resistor R1 which is connected to ground.
- the control device SL processes a voltage drop across the shunt resistor R1 as an input signal.
- the voltage drop is fed to the inverting input of a comparator K, at the non-inverting input of which there is a reference voltage U REF with a constant value.
- the output of the comparator K is connected to the control device SL.
- the two MOSFET transistors S6, S7 are successively each triggered once with a pulse 1.
- This is the resonant circuit, consisting of the secondary coil L2, the high-voltage capacitor Z and the fluorescent lamp KL triggered.
- the resonant circuit reverberates an e-function (see signal 4, point 2).
- the gas in the cold cathode fluorescent lamp KL can ionize and organize itself during this time.
- the transistors S6, S7 continuously controlled alternately (signal 1 and 2, point 4).
- the Cold cathode fluorescent lamp KL emits light immediately from this point in time (as signal 4 can be seen in point 3).
- the control device SL controls the MOSFET transistors S6, S7 in a pulsed manner on ( Figure 6a, signal 1 and 2).
- the one through the MOSFET transistors S6, S7 current flowing is considered voltage drop across the Shunt resistance R1 measured and evaluated by comparator K2, which depends on whether the measured voltage is the reference value exceeds or not, emits a low or high signal.
- the output signal of the comparator K2 becomes logical in the control device SL linked with signal 1. This causes the MOSFET transistors S6, S7 during control by the control logic in the Clock of the output signal of the comparator K controlled or blocked become.
- This device has the advantage that the flicker-free operation of the fluorescent lamp L only through the special control of the MOSFET transistors S6, S7 is reached. On extensive control circuits, as usual, you can do without.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997117309 DE19717309A1 (de) | 1997-04-24 | 1997-04-24 | Gegentaktwandler mit überlagerter Stromregelung |
DE19717309 | 1997-04-24 | ||
DE19733939 | 1997-08-06 | ||
DE19733939A DE19733939A1 (de) | 1997-08-06 | 1997-08-06 | Schaltungsanordnung zum dimmbaren Betrieb einer Leuchtstofflampe |
PCT/EP1998/002290 WO1998048597A1 (de) | 1997-04-24 | 1998-04-17 | Schaltungsanordnung zum dimmbaren betrieb einer leuchtstofflampe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0978221A1 EP0978221A1 (de) | 2000-02-09 |
EP0978221B1 true EP0978221B1 (de) | 2004-12-22 |
Family
ID=26036062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98924143A Expired - Lifetime EP0978221B1 (de) | 1997-04-24 | 1998-04-17 | Schaltungsanordnung zum dimmbaren betrieb einer leuchtstofflampe |
Country Status (5)
Country | Link |
---|---|
US (1) | US6351080B1 (ja) |
EP (1) | EP0978221B1 (ja) |
JP (1) | JP4116092B2 (ja) |
DE (1) | DE59812414D1 (ja) |
WO (1) | WO1998048597A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6946806B1 (en) | 2000-06-22 | 2005-09-20 | Microsemi Corporation | Method and apparatus for controlling minimum brightness of a fluorescent lamp |
US6307765B1 (en) * | 2000-06-22 | 2001-10-23 | Linfinity Microelectronics | Method and apparatus for controlling minimum brightness of a fluorescent lamp |
US7304439B2 (en) * | 2001-09-06 | 2007-12-04 | E. Energy Technology Limited | Phase-controlled dimmable electronic ballasts for fluorescent lamps with very wide dimming range |
US6969958B2 (en) * | 2002-06-18 | 2005-11-29 | Microsemi Corporation | Square wave drive system |
US6979959B2 (en) * | 2002-12-13 | 2005-12-27 | Microsemi Corporation | Apparatus and method for striking a fluorescent lamp |
US7061191B2 (en) * | 2003-07-30 | 2006-06-13 | Lutron Electronics Co., Inc. | System and method for reducing flicker of compact gas discharge lamps at low lamp light output level |
DE10340198B4 (de) * | 2003-08-27 | 2009-03-12 | Institut für Mikroelektronik- und Mechatronik-Systeme gGmbH | Schaltungsanordnung zum Dimmen von Gasentladungslampen und Verfahren zu ihrem Betrieb |
US7187139B2 (en) * | 2003-09-09 | 2007-03-06 | Microsemi Corporation | Split phase inverters for CCFL backlight system |
US7183727B2 (en) * | 2003-09-23 | 2007-02-27 | Microsemi Corporation | Optical and temperature feedbacks to control display brightness |
US6969955B2 (en) * | 2004-01-29 | 2005-11-29 | Axis Technologies, Inc. | Method and apparatus for dimming control of electronic ballasts |
US7468722B2 (en) * | 2004-02-09 | 2008-12-23 | Microsemi Corporation | Method and apparatus to control display brightness with ambient light correction |
WO2005099316A2 (en) * | 2004-04-01 | 2005-10-20 | Microsemi Corporation | Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system |
US7755595B2 (en) | 2004-06-07 | 2010-07-13 | Microsemi Corporation | Dual-slope brightness control for transflective displays |
US7569998B2 (en) * | 2006-07-06 | 2009-08-04 | Microsemi Corporation | Striking and open lamp regulation for CCFL controller |
US8093839B2 (en) | 2008-11-20 | 2012-01-10 | Microsemi Corporation | Method and apparatus for driving CCFL at low burst duty cycle rates |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4358716A (en) | 1980-04-14 | 1982-11-09 | White Castle System, Inc. | Adjustable electrical power control for gas discharge lamps and the like |
DE3528838A1 (de) | 1985-08-10 | 1987-02-12 | Diehl Gmbh & Co | Zuend- und dimmschaltung fuer eine leuchtstoffroehre |
FR2649277B1 (fr) | 1989-06-30 | 1996-05-31 | Thomson Csf | Procede et dispositif de gradation de lumiere pour lampe fluorescente d'eclairage arriere d'ecran a cristaux liquides |
JPH03112096A (ja) | 1989-09-26 | 1991-05-13 | Matsushita Electric Works Ltd | 放電灯点灯装置 |
JP3196206B2 (ja) | 1990-09-25 | 2001-08-06 | 東芝ライテック株式会社 | 放電ランプ点灯装置 |
US5272327A (en) | 1992-05-26 | 1993-12-21 | Compaq Computer Corporation | Constant brightness liquid crystal display backlight control system |
JPH06333695A (ja) * | 1993-05-26 | 1994-12-02 | Sharp Corp | 調光装置 |
DE4326415B4 (de) | 1993-08-06 | 2006-04-13 | Siemens Ag | Verfahren zur Ansteuerung einer Leuchtstofflampe und Anordnung zur Durchführung des Verfahrens |
EP0673184B1 (en) | 1994-03-16 | 2004-10-27 | Linear Technology Corporation | Fluorescent lamp power supply and control circuit for wide range operation |
DE4437204A1 (de) | 1994-08-31 | 1996-03-07 | Vdo Schindling | Verfahren und Schaltungsanordnung zum Betrieb einer Leuchtstofflampe |
KR100420233B1 (ko) | 1995-07-10 | 2004-06-24 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 회로장치 |
JPH09245976A (ja) | 1996-03-01 | 1997-09-19 | Mitsubishi Electric Corp | 放電灯調光点灯装置 |
US5920155A (en) * | 1996-10-28 | 1999-07-06 | Matsushita Electric Works, Ltd. | Electronic ballast for discharge lamps |
-
1998
- 1998-04-17 US US09/402,619 patent/US6351080B1/en not_active Expired - Fee Related
- 1998-04-17 JP JP54500398A patent/JP4116092B2/ja not_active Expired - Fee Related
- 1998-04-17 EP EP98924143A patent/EP0978221B1/de not_active Expired - Lifetime
- 1998-04-17 WO PCT/EP1998/002290 patent/WO1998048597A1/de active IP Right Grant
- 1998-04-17 DE DE59812414T patent/DE59812414D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0978221A1 (de) | 2000-02-09 |
JP2002511181A (ja) | 2002-04-09 |
JP4116092B2 (ja) | 2008-07-09 |
WO1998048597A1 (de) | 1998-10-29 |
DE59812414D1 (de) | 2005-01-27 |
US6351080B1 (en) | 2002-02-26 |
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