CN101849439B - Operating lighting means - Google Patents
Operating lighting means Download PDFInfo
- Publication number
- CN101849439B CN101849439B CN2008801106010A CN200880110601A CN101849439B CN 101849439 B CN101849439 B CN 101849439B CN 2008801106010 A CN2008801106010 A CN 2008801106010A CN 200880110601 A CN200880110601 A CN 200880110601A CN 101849439 B CN101849439 B CN 101849439B
- Authority
- CN
- China
- Prior art keywords
- power supply
- electric energy
- supply modulator
- sensing
- modulator
- 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 - Fee Related
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
- H05B41/26—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
- H05B41/3925—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
- H05B41/36—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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
A method for supplying lighting means with feed-forward controlled power is proposed. Thereby - a power modulator is supplied with DC power, - the DC power is generated on the basis of AC 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.
Description
Technical field
Present invention relates in general to the electric power supply to lighting devices such as fluorescent lamp, high-intensity discharge lamp, organic or inorganic light-emitting diode.
Background technology
Than high rated power, as being lower than the rated power of 25W, lower to the requirement of the tolerable harmonic wave of the electric ballast of the light fixture that is supplied with line voltage at low rated power.Therefore, at low rated power, active PFC (the power factor controlling unit with controlled switch) not necessarily.
On the other hand, if so active PFC is not set in ballast, the problem that then may exist is: holding capacitor will always be charged to the peak-peak of the line voltage that is connected with electric ballast, so that busbar voltage will change synchronously with line voltage.More precisely, the dc voltage at holding capacitor two ends is the AC ripple of line voltage frequency twice with the frequency of occurrences.
At present, if the reason for cost, use is supplied with busbar voltage and supplies the DC/AC converter of AC voltage to lighting device, the operating frequency of this DC/AC converter can not change, then have this problem, namely the electric power supply of illumination apparatus and and then the intensity of light will change synchronously with line voltage.
Summary of the invention
The objective of the invention is to propose a kind of technology, be used for reducing the impact for the ripple illumination apparatus operating characteristic of the dc voltage of the power supply modulator of lighting device.At first understand " ripple " and be the variation of preferred one pole dc voltage, this changes less than the DC level.
Feature by independent claims realizes purpose of the present invention.Dependent claims has further been deepened central idea of the present invention.
Generally, the present invention proposes a kind of feed forward control method.Measure and assess the parameter of the supply voltage that is used for power supply modulator, determine parameter with the power supply that power supply modulator is set.The feedback signal that affects in order to compensate ripple that does not come from lamp circuit (by the power supply modulator power supply).Do not get rid of and have the feedback signal that is used for other purposes.
For this consideration, the present invention proposes a kind of for to the method for these lighting apparatus power supplies, a kind of computer software program product, a kind of power subsystem and a kind of integrated circuit of carrying out the method when moving computing equipment, for example is used for implementing the ASIC of described power control method.
According to a first aspect of the invention, a kind of method for supply feed-forward controlled power to lighting device is proposed, wherein, to power supply modulator supply DC electric energy; DC electric energy (battery power that for example changes) based on AC electric energy or variation produces described DC electric energy; And power supply modulator is powered to lighting device, and wherein, the control unit sensing is supplied to the DC electric energy of power supply modulator, and the control power supply modulator, and the power supply that power supply modulator is set with the electric energy according to sensing is determined parameter.
Based on the electric energy of sensing, control unit can be determined parameter for the power supply of power supply modulator and determine rated value.
Power supply determines that parameter can be frequency and/or the duty factor of the controlled switch of power supply modulator.
Control unit can digitally be processed the electric energy of sensing.
Control unit can be processed the sampled value at least one past of the electric energy of the current sampled value of electric energy of sensing and sensing.
Can be based on the DC supply voltage sensing electric energy of power supply modulator.
Can not use active PFC and be provided for the electric energy of power supply modulator.
Be supplied to the electric energy of power supply modulator can present ripple, this ripple has the frequency identical with the AC mains frequency or has the frequency of the multiple of AC mains frequency.
Power supply modulator can be for example half bridge converter, full-bridge converter, step-down and/or booster converter.
Lighting device can be one or more LED or discharge lamp.
Another aspect of the present invention relates to a kind of integrated circuit, for example ASIC or microcontroller, and described integrated circuit (IC) design is the described method of any one claim in the aforementioned claim of executive basis.
When reading by reference to the accompanying drawings the description of following non-limiting example, further feature of the present invention, advantage and purpose will become obvious.
Description of drawings
The schematically illustrated use half bridge converter according to the present invention of Fig. 1 is as the circuit of power supply modulator.
The schematically illustrated use buck converter according to the present invention of Fig. 2 is as the circuit of power supply modulator.
Embodiment
In Fig. 1, show line voltage power supply 1, namely have the AC voltage of the frequency of the peak value of 220V for example or 240V and 50Hz or 60Hz.Line voltage 1 for example is rectified by bridge rectifier 2, and is supplied to holding capacitor 3.Holding capacitor 3 will provide and can be modulated to the dc voltage (" busbar voltage ") synchronous with line voltage 1.Busbar voltage is supplied to power supply modulator 4, and this power supply modulator 4 is to light source 7 power supplies.
As shown in Figure 1, be not provided with source switch PFC between rectifier 2 and holding capacitor 3, this is so that the dc voltage 8 of holding capacitor 3 is the AC ripple of twice of the frequency of line voltage 1 with frequence of exposure.
The present invention proposes to detect line voltage 1 or detects the busbar voltage 8 that is supplied to power supply modulator 4 (the DC/AC converter is an example of power supply modulator), i.e. the voltage 8 at holding capacitor 3 two ends, and propose this information is offered control unit 5.
Then, control unit 5 will be based on line voltage 1 or busbar voltage 8 control of feedforward ground power supply modulator 4, i.e. the power supply parameters of power supply modulator 4 of sensing.Particularly, the present invention proposes digitally and/or integrally to realize such control unit 5.
Shown semibridge system DC/AC converter 4 is examples of power supply modulator.Other example is, for instance, for example is used for to the buck converter of LED (organic or inorganic light-emitting diode) power supply or for example has the push-pull converter of the ballast that is used in fluorescent lamp of the low supply voltage of 12V.Explain an alternative with reference to Fig. 2 after a while, this alternative only is in many examples.
Shown in example in, power supply modulator comprises DC/AC converter 4 and load, DC/AC converter 4 has two the switch element S1, the S2 that are connected in series (for example MOSFET), load comprises resonant circuit 6 and light source 7.
Shown in Fig. 1 goes back, analog signal 11 is sensed to be the time behavior (not necessarily also representing absolute level) that represents at least busbar voltage 8 and/or line voltage 1.This sensed analog signal 11 can be digitized as N-bit digital values (N is greater than 1 integer and is preferably more than 2) by A/D converter 9, then is provided for the converter unit 10 of control unit 5.It also is possible that analog signal 11 is sensed to be the absolute level that represents at least busbar voltage 8 and/or line voltage 1.
The digitized current sampled value e (k) that converter unit 10 will provide and also the value e in selectable one or more past (k-1) be transformed to power supply modulation parameter x (k), power supply modulation parameter x (k) for example offers power supply modulator 4 via drive circuit 12.
Can be for example by use be stored in the memory 13 look-up table or by using the function that preferably is digitized realization, carry out this conversion.
The value x (k) of current sample rate e (k) or conversion can be stored in the register 14, is used for the conversion of the successor value of x (k).
Therefore, control power supply modulator 4 according to the analog voltage signal of sensing.Therefore, calculate value x (k) for the control signal of power supply modulator 4 in digitized mode.Generally speaking, converter unit 10 will be controlled power supply modulator 4 according to line voltage 1 and/or the busbar voltage 8 of sensing, i.e. the power supply parameters of power supply modulator 4.In this illustrative example, according to busbar voltage 8 and/or the line voltage 1 of sensing, power supply modulator has setting the frequency of operation f of half bridge converter of the load circuit 6 of connection.
In this example, for example be supplied to the electric energy of light source to provide direct function to the frequency control signal of power supply modulator, so that can from the FREQUENCY CONTROL value, derive the current electric energy that is supplied to light source.
Therefore, data register can keep about the information of the sampled value of the current electric energy that sends load 6 to or about the information of value before the sampled value of the electric energy that sends load 6 to one or more.
Preferably, converter unit not only has been supplied bus voltage signal or line voltage signal, and is provided the output of data register 14, and and then is provided current energy value and/or energy value before (one or more).
Then, generally speaking, converter unit 10 will according to data register value and the busbar voltage of sensing or the value of line voltage before, calculate the power supply settings.
In Fig. 2, show the buck converter as the other example of the power supply modulator of driving light source LED.This circuit can be powered by the line voltage power supply, namely has the AC voltage of the frequency of the peak value of 220V for example or 240V and 50Hz or 60Hz.Line voltage can be rectified by for example bridge rectifier, and is provided for holding capacitor.Holding capacitor will provide and can be modulated to the dc voltage synchronous with line voltage (" busbar voltage ").Busbar voltage is supplied to the buck converter (power supply modulator) of light source led power supply.
As an alternative, it also is possible that the 12V voltage that low supply voltage is for example come from battery supply is supplied to supply convertor (buck converter).
Be similar to Fig. 1, need to be provided with source switch PFC between rectifier and holding capacitor, this is so that the dc voltage of holding capacitor is the AC ripple of the twice of line voltage frequency with frequence of exposure.
The present invention proposes to detect line voltage or the busbar voltage that is supplied to buck converter in the midpoint of resistive voltage divider R9 and R10, i.e. the voltage at holding capacitor two ends, and this information Vs offered control unit.
When switch S 1 was closed, electric current will be from holding capacitor flow through light source led, capacitor C1, choke L1 and switch S 1.Choke L1 will be magnetized.When switch S 1 disconnects, the electric current of the choke L1 that flows through will continue to flow with the afterflow path, and flow through diode D1 and light source led, capacitor C1 are until choke L1 demagnetization or switch S 1 closure again.
According to the information Vs that offers control unit, control unit can the controlled hypotension converter.The electric energy that sends light source led to is recently determined by the switch of switch S 1.Can modulate to change described electric energy by frequency or pulsewidth to the control signal S1D of control switch S1.
In order to keep constant electric energy at light source led, not necessarily to use closed-loop control.For example, when LED does not have ground connection, carry out Current Control and need to spend more strength and measure by the flow through electric current of LED of measurement.When the electric current of switch S 1 is flowed through in measurement, not about the current information at the LED that flows through of switch S 1 off period.
When with given duty ratio (pulsewidth) and given FREQUENCY CONTROL switch S 1, may be enough.When light source led and the value that is included in the element in the supply convertor were known, only variation may be in supply voltage.By midpoint sensing busbar voltage or the supply voltage at resistive voltage divider R9 and R10, this information Vs can be transmitted to control unit, and can control switch S1 according to voltage or the electric energy of sensing.
In this example, the electric energy that for example is supplied to light source is the direct function of the pulse-width control signal of supply power modulator, so that can derive current electric energy for the light source supply from the pulse width control value.
Function in this example can be as follows: when voltage Vs reduced, pulsewidth will increase, to keep sending to the electric energy of light source led.When voltage Vs increased, pulsewidth will reduce, to keep sending to the electric energy of light source led.
The power supply modulator that is used for driving light source can be for example half bridge converter, full-bridge converter, push-pull converter, buck-boost converter or booster converter.
As described, the present invention includes following aspect:
Civil power input with AC/DC converter (rectifier).
To the proportional sensing signal of dc voltage (=busbar voltage).
Analog sensing signal is converted to has 〉=digital information of 1 bit resolution.
Power stage is come energy supply by the DC busbar voltage, has the mobile input of controlling to the electric energy that sends load (light source, discharge lamp, LED) to.Usually, this input is the control signal of mains switch.
Modulator has and receives about the input of the information of the electric energy that will send load to and the output with control inputs of the power stage of being connected to.Usually, modulator is the PWM unit.
The clock of the update cycle of trigger data register.
Data register keeps about send the information of the electric energy of load at current point in time.
The input of data register is connected to converter unit.
Converter unit has and is connected to and the input of the proportional digital signal of busbar voltage and the output that is connected to the input of data register.Converter unit also can be connected to memory or external information (can be data input or configuration information).Conversion can be that linearity multiplies each other or nonlinear function or look-up table (LUT).
1. embodiment: linear function:
By the data register value X (k-1) before the combination and the value of busbar voltage e (k), produce the input X (k) of data register.
X(k)＝f(X(k-1)，e(k)，I)
Described combination is with (synchronously) logic realization.
Described combination is that linearity multiplies each other
X(k)＝K·e(k)
Described combination is linear sums
X(k)＝∑K
i·e(k-i)+∑L
j·X(k-j)+I
2. embodiment: nonlinear function:
Described combination is non-linear sums
X(k)＝∑K
i(e，X)·e(k-i)+∑L
j(e，X)·X(k-j)+I(e，X)
Described combination realizes with software.
Load stage is the half-bridge with resonant circuit.
The control signal that inputs to modulator is frequency.
Conversion has forward characteristic, and namely frequency increases along with the increase of busbar voltage.
Claims (21)
1. one kind is used for to the method for lighting device supply feed-forward controlled power, wherein:
To power supply modulator supply DC electric energy;
DC electric energy based on AC electric energy or variation produces described DC electric energy; And
Described power supply modulator is powered to described lighting device, wherein, the control unit sensing is supplied to the DC electric energy of described power supply modulator, and control described power supply modulator, to determine that according to the power supply of the value at least one past of the electric energy of the electric energy of sensing and described sensing or described power supply modulator the power supply that the value at least one past of parameter arranges described power supply modulator determines parameter, wherein said power supply determines that parameter is frequency and/or the duty factor of the controlled switch of described power supply modulator.
2. method according to claim 1, wherein, described control unit is based on the electric energy of described sensing, and the power supply of determining described power supply modulator is determined the value of parameter.
3. method according to claim 1 and 2, wherein, described control unit is digitally processed the electric energy of described sensing.
4. method according to claim 2, wherein, described control unit is processed the sampled value at least one past of the electric energy of the current sampled value of electric energy of described sensing and described sensing.
5. method according to claim 1 and 2 wherein, is come the described electric energy of sensing based on the DC supply voltage of described power supply modulator.
6. method according to claim 1 and 2 wherein, does not arrange active PFC and to described power supply modulator supply electric energy.
7. method according to claim 1 and 2 wherein, is supplied to the electric energy of described power supply modulator to present ripple, and described ripple has the frequency that equates with the AC mains frequency or has the frequency of the multiple of described AC mains frequency.
8. method according to claim 1 and 2, wherein, described power supply modulator is a kind of in half bridge converter, full-bridge converter, step-down and/or the booster converter.
9. method according to claim 1 and 2, wherein, described lighting device is one or more LED or one or more discharge lamp.
10. one kind is used for comprising to the integrated circuit of lighting device supply feed-forward controlled power:
Power supply modulator, described power supply modulator are configured to be supplied the DC electric energy that the DC electric energy based on AC electric energy or variation produces, and also are configured to described lighting device power supply;
Controlled switch, described controlled switch are included in the described power supply modulator;
Control unit, described control unit is configured to the DC electric energy that sensing is supplied to described power supply modulator, and be configured to control described power supply modulator, to determine that according to the power supply of the value at least one past of the electric energy of the electric energy of sensing and described sensing or described power supply modulator the power supply that the value at least one past of parameter arranges described power supply modulator determines parameter, wherein said power supply determines that parameter is frequency and/or the duty factor of the controlled switch of described power supply modulator.
11. integrated circuit according to claim 10, wherein, described integrated circuit is ASIC or microcontroller.
12. integrated circuit according to claim 10, wherein, described control unit is based on the electric energy of described sensing, and the power supply of determining described power supply modulator is determined the value of parameter.
13. integrated circuit according to claim 10, wherein, described control unit is digitally processed the electric energy of described sensing.
14. integrated circuit according to claim 10, wherein, described control unit is processed the sampled value at least one past of the electric energy of the current sampled value of electric energy of described sensing and described sensing.
15. integrated circuit according to claim 10 wherein, comes the described electric energy of sensing based on the DC supply voltage of described power supply modulator.
16. integrated circuit according to claim 10 wherein, does not arrange active PFC and to described power supply modulator supply electric energy.
17. integrated circuit according to claim 10 wherein, is supplied to the electric energy of described power supply modulator to present ripple, described ripple has the frequency that equates with the AC mains frequency or has the frequency of the multiple of described AC mains frequency.
18. integrated circuit according to claim 10, wherein, described power supply modulator is a kind of in half bridge converter, full-bridge converter, step-down and/or the booster converter.
19. integrated circuit according to claim 10, wherein, described lighting device is one or more LED or one or more discharge lamp.
20. a ballast that is used for lighting device comprises according to claim 10 any one described circuit in 19.
21. a light fixture comprises ballast according to claim 20.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07120098.4 | 2007-11-06 | ||
| EP07120098 | 2007-11-06 | ||
| PCT/EP2008/009382 WO2009059772A1 (en) | 2007-11-06 | 2008-11-06 | Operating lighting means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101849439A CN101849439A (en) | 2010-09-29 |
| CN101849439B true CN101849439B (en) | 2013-09-18 |
Family
ID=40455273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801106010A Expired - Fee Related CN101849439B (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) |
Families Citing this family (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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5914572A (en) * | 1997-06-19 | 1999-06-22 | Matsushita Electric Works, Ltd. | Discharge lamp driving circuit having resonant circuit defining two resonance modes |
| EP0758159B1 (en) * | 1995-08-07 | 2002-04-10 | Nec Corporation | Converter wherein a piezoelectric transformer input signal is frequency modulated by a pulse width modulated signal |
| CN1397150A (en) * | 2000-12-05 | 2003-02-12 | 皇家菲利浦电子有限公司 | Electronic ballast with feed-forward control |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7557521B2 (en) | 2004-03-15 | 2009-07-07 | Philips Solid-State Lighting Solutions, Inc. | 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 DE DE112008002754T patent/DE112008002754T5/en not_active Withdrawn
- 2008-11-06 WO PCT/EP2008/009382 patent/WO2009059772A1/en active Application Filing
- 2008-11-06 EP EP08847992.8A patent/EP2208399B1/en active Active
- 2008-11-06 CN CN2008801106010A patent/CN101849439B/en not_active Expired - Fee Related
- 2008-11-06 AT ATA9377/2008A patent/AT517937B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0758159B1 (en) * | 1995-08-07 | 2002-04-10 | 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 |
| CN1397150A (en) * | 2000-12-05 | 2003-02-12 | 皇家菲利浦电子有限公司 | Electronic ballast with feed-forward control |
Also Published As
| Publication number | Publication date |
|---|---|
| AT517937A5 (en) | 2017-06-15 |
| EP2208399B1 (en) | 2013-04-17 |
| DE112008002754T5 (en) | 2010-12-09 |
| EP2208399A1 (en) | 2010-07-21 |
| AT517937B1 (en) | 2017-06-15 |
| CN101849439A (en) | 2010-09-29 |
| WO2009059772A1 (en) | 2009-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI566637B (en) | A cascade boost and inverting buck converter with independent control | |
| CN101932170B (en) | Circuit and method for driving a load, electric system and controller | |
| US6278245B1 (en) | Buck-boost function type electronic ballast with bus capacitor current sensing | |
| CN103313472B (en) | LED drive circuit with dimming function and lamp | |
| US6222746B1 (en) | Power supply device and method with a power factor correction circuit | |
| US7598685B1 (en) | Off line LED driver with integrated synthesized digital optical feedback | |
| CN102573218B (en) | LED drive and control method | |
| CN104813743B (en) | Circuit arrangement, LED, illuminator and the operating method using the circuit arrangement | |
| TWI388960B (en) | Power systems, display systems, and method for powering loads | |
| JP2007080771A (en) | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting | |
| US20120133295A1 (en) | Power regulation of led by means of an average value of the led current and bidirectional counter | |
| CN109247042A (en) | Using the AC/DC Pfc converter and corresponding conversion method of half bridge resonant converter | |
| WO2012167127A1 (en) | Control data determination from primary-side sensing of a secondary-side voltage in a switching power converter | |
| JP2000123970A5 (en) | ||
| KR100820613B1 (en) | Low voltage power supply circuit for lighting, lighting apparatus, and low voltage power supply output method for lighting | |
| CN105324925A (en) | Quantization error reduction in constant output current control drivers | |
| TW201306657A (en) | Driving circuit system for gas discharge lamp and the control method thereof | |
| KR20170029999A (en) | LED Driver and Driving Method for Power Factor Correction | |
| CN101849439B (en) | Operating lighting means | |
| Sebastian et al. | A very simple control strategy for power factor correctors driving high-brightness light-emitting diodes | |
| TWI470914B (en) | An output current control circuit for a power converter | |
| US8836233B2 (en) | Light source apparatus and driving apparatus thereof | |
| US10038386B2 (en) | Magnetron power supply | |
| KR101809996B1 (en) | LED apparatus for improving flicker effect | |
| TWI359339B (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20191106 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |