WO2009059772A1 - Operating lighting means - Google Patents
Operating lighting means Download PDFInfo
- Publication number
- WO2009059772A1 WO2009059772A1 PCT/EP2008/009382 EP2008009382W WO2009059772A1 WO 2009059772 A1 WO2009059772 A1 WO 2009059772A1 EP 2008009382 W EP2008009382 W EP 2008009382W WO 2009059772 A1 WO2009059772 A1 WO 2009059772A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- modulator
- supplied
- sensed
- voltage
- Prior art date
Links
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
- H05B41/36—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
-
- 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
- H05B41/2825—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 bridge converter in the final stage
- H05B41/2828—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 bridge converter in the final stage using control circuits for the switching elements
-
- 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
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Definitions
- the present invention generally relates to the supply of electrical power to lighting means, such as for example fluorescent lamps, high intensity discharge lamps, organic or inorganic light emitting diodes, etc.
- Rapple is top be understood of a variation of a preferably unipolar DC voltage, the variation being smaller than the DC level.
- the invention proposes a feed-forward control approach.
- a parameter of the supply voltage for the power modulator is measured and evaluated in order to set a power-determining parameter of the power modulator.
- the invention proposes a method for supplying these lighting devices with power, to a computer software program product executing such a method when running a computing device, to a power supply unit as well as to an integrated circuitry, such as for example an ASIC for implementing the power supply control method.
- the DC power is generated on the basis of AC power or varying DC power (e.g. varying battery power), and - the power modulator supplies power to the lighting means, wherein a control unit senses the DC power supplied to the power modulator and controls the power modulator in order to set power-determining parameter of the power modulator depending on the sensed power.
- a control unit senses the DC power supplied to the power modulator and controls the power modulator in order to set power-determining parameter of the power modulator depending on the sensed power.
- the control unit may determine a nominal value for power-determining parameter of the power modulator on the basis of the sensed power
- the power-determining parameter may be the frequency and/or the duty cycle of a controlled switch of the power modulator.
- the control unit can process digitally the sensed power .
- the control unit can process the current as wells as at least one past sample value of the sensed power.
- the power can be sensed on the basis of a DC supply voltage of the power modulator.
- the power for the power modulator can be supplied without the use of an active PFC.
- the power supplied to the power modulator can present a ripple with a frequency which is equal to the AC mains frequency or a multiple thereof.
- the power modulator can be e.g. a half bridge converter, a full-bridge converter, a buck, an/or a boos converter.
- the lighting means may be one or more LEDs or discharge lamps.
- a further aspect of the invention relates to an integrated circuitry, such as e.g. a ASIC or a microcontroller, which is designed to perform a method according to any of the preceding claims.
- Figure 1 shows schematically a circuitry- according to the present invention using a half-bridge converter as power modulator
- FIG. 2 shows schematically a circuitry- according to the present invention using a buck converter as power modulator.
- a mains voltage supply i.e. a AC voltage having a peak value of e.g. 220V or 240V and a frequency of 50Hz or 60Hz.
- the mains voltage 1 is rectified e.g. by a bridge rectifier 2 and supplied to a storage capacitor 3.
- the storage capacitor 3 will supply a DC voltage ("bus voltage”) which may be modulated synchronously to the mains voltage 1.
- the bus voltage is supplied to a power modulator 4 which supplies power to a light source 7.
- the invention proposes to detect the mains voltage 1 or the bus voltage 8 supplied to the power modulator (the DC/AC converter being just one example thereof) 4, i.e. the voltage 8 across the storage capacitor 3 and to supply this information to a control unit 5.
- the control unit 5 will then feed-forward control the power modulator 4, i.e. a power-setting parameter thereof pending on the sensed mains voltage 1 or bus voltage 8.
- the invention particularly proposes a digital and/or integrated implementation of such a control unit 5.
- the shown half-bridge DC/AC converter 4 is one example of the power modulator.
- Other examples are e.g. a buck converter e.g. for supplying power to LEDs (organic or inorganic light emitting diodes) or a Push-Pull converter for use in ballasts for fluorescent lamps with low supply voltage of e.g. 12V.
- a buck converter e.g. for supplying power to LEDs (organic or inorganic light emitting diodes) or a Push-Pull converter for use in ballasts for fluorescent lamps with low supply voltage of e.g. 12V.
- a Push-Pull converter for use in ballasts for fluorescent lamps with low supply voltage of e.g. 12V.
- the power modulator comprises a half bridge DC/AC converter 4 with two serial connected switching elements Sl, S2 (such as for example MOSFETs) and a load comprising a resonance circuitry 6 and the light source 7.
- an analogue signal 11 is sensed representing at least the time behaviour (not necessarily also the absolute level) of the bus voltage 8 and/or the mains voltage 1.
- This sensed analogue signal 11 can be digitized by a A/D converter 9 in a N-bit digital value (N being an integer greater than 1 and preferably greater than 2) and then be supplied to a transformation unit 10 of the control unit 5. It is also possible that the analogue signal 11 is sensed representing at least the absolute level of the bus voltage 8 and/or the mains voltage 1.
- the transformation unit 10 transforms the supplied digital current sample value e(k) and optionally also one or more past values e(k-l) to a power modulating parameter x(k) supplied to the power modulator 4 e.g. via a driver circuitry 12.
- the transformation can be performed e.g. by using a look-up table stored in a memory 13 or by using a preferably digitally implemented function.
- the current sample rate e(k) or the transformed value x(k) can be stored in a register 14 for use in the transformation of subsequent values of x(k) .
- the power modulator 4 is controlled depending on the sensed analogue voltage signal.
- the value x(k) for the control signal for the power modulator 4 is computed.
- the power modulator 4, i.e. a power-setting parameter thereof will be controlled by the transformation unit 10 depending on the sensed mains voltage 1 and/or bus voltage 8.
- the power modulator will set the operational frequency f of the half-bridge converter with connected load circuitry 6 depending on the sensed bus voltage 8 and/or mains voltage 1.
- the power supply to the light source is a direct function of the frequency control signal supplied to the power modulator, such that the currently supplied power for the light source can be derived from the frequency control value .
- the data register thus can hold information about the currently delivered power sample value or one or more previous values thereof to the load 6.
- the transformation unit preferably is not only supplied with the bus voltage or main voltage signal, but also with an output of the data register 14 and thus the current and/or previous power value (s) .
- the transformation unit 10 will then compute a power setting value depending on the previous data register value and the value of the sensed bus or mains voltage.
- FIG 2 there is shown a buck converter as an additional example for a power modulator driving a light source LED.
- This circuit can be supplied by a mains voltage supply, i.e. an AC voltage having a peak value of e.g. 220V or 240V and a frequency of
- the mains voltage can rectified e.g. by a bridge rectifier and supplied to a storage capacitor.
- the storage capacitor will supply a DC voltage ("bus voltage") which may be modulated synchronously to the mains voltage.
- the bus voltage is supplied to the buck converter (power modulator) which supplies power to a light source LED.
- the power converter (buck converter) with a low supply voltage, e.g. 12V from a battery source.
- the invention proposes to detect the mains voltage or the bus voltage supplied to the buck converter, i.e. the voltage across the storage capacitor at the midpoint of the resistive voltage divider R9 and RlO and to supply this information Vs to a control unit.
- the buck converter may be controlled by the control unit depending on the information Vs supplied to the control unit.
- the power delivered to the light source may be controlled by the control unit depending on the information Vs supplied to the control unit.
- the power may be varied by modulation of the frequency or the pulse width of the control signal SlD which is controlling the switch Sl.
- the power supplied to the light source is a direct function of the pulse width control signal supplied to the power modulator, such that the currently supplied power for the light source can be derived from the pulse width control value.
- the function in the present example would be following: When the voltage Vs is decreasing, the pulse width will be increased in order to maintain the power delivered to the light source LED. When the voltage Vs is increasing, the pulse width will be decreased in order to maintain the power delivered to the light source LED.
- the power modulator for the drive of a light source may be e.g. a half bridge converter, a full-bridge converter, a push-pull, a buck-boost or a boost converter.
- a power stage which is supplied by the DC bus voltage which has an input that controls the flow of power delivered to a load (light source, discharge lamp, LED) . Normally the input is a control signal of a power switch.
- a modulator which has an input that takes information about the power that shall be delivered to the load as well as an output which is connected to the control input of the power stage. Normally the modulator is a PWM unit.
- a clock which is triggering an update cycle of the data register.
- a data register which holds information about the power delivered to the load at the current point of time.
- the input of the data register is connected to a transformation unit.
- the transformation unit has an input which is connected to the digital signal proportional to the bus voltage and an output which is connected to the input of the data register.
- the transformation unit can be connected also to a memory or external information (can be a data input or configuration information) .
- the transformation can be a linear gain or a nonlinear function or a lookup table (LUT) .
- Embodiment Linear function: > The input of the data register X(k) is generated by a combining the previous data register value X(k-l) with the value of the bus voltage e(k) .
- the combination is a nonlinear sum
- the combination may be implemented as software.
- the load stage is a half bridge with a resonant circuit .
- the control signal into the modulator is a frequency.
- the transformation has a positive forward characteristic i.e. the frequency increases with increasing bus voltage.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008801106010A CN101849439B (en) | 2007-11-06 | 2008-11-06 | Operating lighting means |
EP08847992.8A EP2208399B1 (en) | 2007-11-06 | 2008-11-06 | Operating lighting means |
DE112008002754T DE112008002754T5 (en) | 2007-11-06 | 2008-11-06 | Operation of lighting equipment |
ATA9377/2008A AT517937B1 (en) | 2007-11-06 | 2008-11-06 | OPERATION OF LIGHTING DEVICES |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07120098.4 | 2007-11-06 | ||
EP07120098 | 2007-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009059772A1 true WO2009059772A1 (en) | 2009-05-14 |
Family
ID=40455273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/009382 WO2009059772A1 (en) | 2007-11-06 | 2008-11-06 | Operating lighting means |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2208399B1 (en) |
CN (1) | CN101849439B (en) |
AT (1) | AT517937B1 (en) |
DE (1) | DE112008002754T5 (en) |
WO (1) | WO2009059772A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9148918B2 (en) | 2013-12-04 | 2015-09-29 | Infineon Technologies Ag | Feedforward circuit for fast analog dimming in LED drivers |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0758159A2 (en) * | 1995-08-07 | 1997-02-12 | Nec Corporation | Converter wherein a piezoelectric transformer input signal is frequency modulated by a pulse width modulated signal |
US5914572A (en) * | 1997-06-19 | 1999-06-22 | Matsushita Electric Works, Ltd. | Discharge lamp driving circuit having resonant circuit defining two resonance modes |
US20020067139A1 (en) * | 2000-12-05 | 2002-06-06 | Philips Elctronics North America Corporation | Electronic ballast with feed-forward control |
US20050231133A1 (en) | 2004-03-15 | 2005-10-20 | Color Kinetics Incorporated | LED power control methods and apparatus |
WO2007004101A1 (en) * | 2005-06-30 | 2007-01-11 | Philips Intellectual Property & Standards Gmbh | Method of driving a discharge lamp in a projection system, and driving unit |
-
2008
- 2008-11-06 WO PCT/EP2008/009382 patent/WO2009059772A1/en active Application Filing
- 2008-11-06 AT ATA9377/2008A patent/AT517937B1/en not_active IP Right Cessation
- 2008-11-06 DE DE112008002754T patent/DE112008002754T5/en not_active Withdrawn
- 2008-11-06 CN CN2008801106010A patent/CN101849439B/en not_active Expired - Fee Related
- 2008-11-06 EP EP08847992.8A patent/EP2208399B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0758159A2 (en) * | 1995-08-07 | 1997-02-12 | Nec Corporation | Converter wherein a piezoelectric transformer input signal is frequency modulated by a pulse width modulated signal |
US5914572A (en) * | 1997-06-19 | 1999-06-22 | Matsushita Electric Works, Ltd. | Discharge lamp driving circuit having resonant circuit defining two resonance modes |
US20020067139A1 (en) * | 2000-12-05 | 2002-06-06 | Philips Elctronics North America Corporation | Electronic ballast with feed-forward control |
US20050231133A1 (en) | 2004-03-15 | 2005-10-20 | Color Kinetics Incorporated | LED power control methods and apparatus |
WO2007004101A1 (en) * | 2005-06-30 | 2007-01-11 | Philips Intellectual Property & Standards Gmbh | Method of driving a discharge lamp in a projection system, and driving unit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9148918B2 (en) | 2013-12-04 | 2015-09-29 | Infineon Technologies Ag | Feedforward circuit for fast analog dimming in LED drivers |
Also Published As
Publication number | Publication date |
---|---|
AT517937B1 (en) | 2017-06-15 |
EP2208399A1 (en) | 2010-07-21 |
CN101849439B (en) | 2013-09-18 |
EP2208399B1 (en) | 2013-04-17 |
DE112008002754T5 (en) | 2010-12-09 |
AT517937A5 (en) | 2017-06-15 |
CN101849439A (en) | 2010-09-29 |
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