CN102026440A - Driving device and illuminating device - Google Patents
Driving device and illuminating device Download PDFInfo
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- CN102026440A CN102026440A CN2009101768493A CN200910176849A CN102026440A CN 102026440 A CN102026440 A CN 102026440A CN 2009101768493 A CN2009101768493 A CN 2009101768493A CN 200910176849 A CN200910176849 A CN 200910176849A CN 102026440 A CN102026440 A CN 102026440A
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Abstract
The invention discloses a driving device comprising a dimming unit, a rectifying filter unit, a voltage change unit, a rectifying voltage division circuit and a drive unit, wherein the dimming unit is used for modulating and changing the input alternating current provided by an alternating current power supply so as to generate modulated alternating current; the rectifying filter unit is used for rectifying and filtering the modulated alternating current so as to generate primary direct current; the rectifying voltage division circuit is used for carrying out the rectification and voltage division on the modulated alternating current so as to generate the detection voltage; the drive unit is used for receiving the primary direct current so as to be electrified and work and generating pulse voltage the duty ratio of which changes along the detection voltage; the voltage change unit is used for converting the primary direct current into drive voltage according to the pulse voltage; and the drive voltage is provided for a light-emitting element. The invention also provides an illuminating device.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of drive unit and lighting device.
Background technology
Controllable silicon dimmer (TRIAC, Triode Alternating Current) all can conducting at the positive half period of AC power and negative half-cycle, it is applied to light-emitting component, light-emitting diode (LED for example, Light Emitting Diode) in the drive circuit, to regulate the luminosity of LED.
TRIAC is normal, and the method for using is to apply control signal by circuits for triggering at its gate, to control its conducting and to end.When AC power was in positive half period and negative half-cycle respectively, circuits for triggering applied forward triggering signal and negative sense triggering signal for respectively the gate of TRIAC.When TRIAC was not excited, the voltage of load LED was zero, and this section period claims α for exciting the angle.When TRIAC was excited, the voltage of load LED raise rapidly, and this section period claims that θ is the angle of flow, respectively has one to excite angle α and conduction angle in positive-negative half-cycle, and α+θ=180 degree.When manipulating, excite angle α, i.e. the average power of the load of delivering to during may command TRIAC conducting as long as change.
Yet, above-mentioned TRIAC is applied in the led drive circuit, because the voltage of load LED was zero when TRIAC was in the time period that excites angle α, the voltage of load LED raise rapidly when TRIAC was in time period of conduction angle, thereby can cause the flicker of LED, and the flicker frequency of this LED does not surpass the flicker frequency 50Hz that human eye can be discerned, so the user can feel that LED is luminous stable inadequately.
Summary of the invention
In view of this, be necessary to provide a kind of luminous stable drive unit of light-emitting component that makes.
Also be necessary to provide a kind of luminous stable lighting device of light-emitting component that makes.
A kind of drive unit, it comprises light modulation unit, rectification filtering unit, voltage transformation module, rectification and voltage division unit and driver element.The input AC electricity that this light modulation unit is used for AC power is provided carries out modulating transformation, and to produce the modulation alternating current, this rectification filtering unit is used for the modulation alternating current is carried out rectification and filtering, to produce primary direct current.This rectification and voltage division unit is used for this modulation alternating current is carried out rectification and dividing potential drop, to produce detecting voltage, this driver element is used to receive primary direct current to work on power, and produce duty ratio with detecting the pulse voltage that voltage changes, this voltage transformation module is used for according to pulse voltage primary direct current being transformed to driving voltage, and this driving voltage is provided for light-emitting component.
A kind of lighting device, it comprises drive unit and light-emitting component, the input AC electricity that this drive unit is used for AC power is provided is transformed to driving voltage, and is luminous with driven light-emitting element.This drive unit comprises light modulation unit, rectification filtering unit, voltage transformation module, rectification and voltage division unit and driver element.This light modulation unit is used for this input AC electricity is carried out modulating transformation, and to produce the modulation alternating current, this rectification filtering unit is used for the modulation alternating current is carried out rectification and filtering, to produce primary direct current.This rectification and voltage division unit is used for this modulation alternating current is carried out rectification and dividing potential drop, and producing detecting voltage, this driver element is used to receive primary direct current working on power, and produces the pulse voltage that duty ratio changes with detecting voltage.This voltage transformation module is used for according to pulse voltage primary direct current being transformed to driving voltage, and this driving voltage is provided for light-emitting component.
Above-mentioned drive unit and lighting device, by rectification and voltage division unit and driver element are set, with of the adjusting of light modulation unit to the brightness of light-emitting component, convert the pulse voltage that produces EDM Generator of Adjustable Duty Ratio by driver element to and realize adjusting the brightness of light-emitting component, and the frequency of this pulse voltage is far longer than the frequency 50Hz that human eye can be discerned, thereby the flicker frequency of light-emitting component will surpass the frequency 50Hz that human eye can be discerned, and human eye will not felt the flicker of light-emitting component.
Description of drawings
Fig. 1 is the functional block diagram of the lighting device of a better embodiment.
Fig. 2 is the physical circuit figure of drive unit shown in Figure 1.
Embodiment
As shown in Figure 1, the lighting device 100 of a better embodiment comprises drive unit 300 and light-emitting component 400.The input AC electricity that drive unit 300 is used for AC power 200 is provided is transformed to driving voltage, and this driving voltage is provided for light-emitting component 400 with luminous.
The modulation alternating current that rectification filtering unit 14 is used for light modulation unit 12 is provided carries out rectification and filtering, to produce primary direct current.In the present embodiment, when controllable silicon dimmer was not excited, when promptly being in the time period that excites angle α, primary direct current was zero.
The modulation alternating current that rectification and voltage division unit 16 is used for light modulation unit 12 is provided carries out rectification and dividing potential drop, to produce detecting voltage.
See also Fig. 2, light modulation unit 12 comprises circuits for triggering 120 and controllable silicon dimmer 124.Controllable silicon dimmer 124 comprises anode, negative electrode and gate.The anode of controllable silicon dimmer 124 connects alternating-current voltage source 200, and negative electrode connects rectification filtering unit 14 and rectification and voltage division unit 16 respectively, and gate connects circuits for triggering 120.
Rectification and voltage division unit 16 comprises the first rectifier diode D1, the second rectifier diode D2, the first divider resistance R1 and the second divider resistance R2.The anode of the first rectifier diode D1 links to each other with the negative electrode of controllable silicon dimmer 124, and the negative electrode of the first rectifier diode D1 links to each other with the negative electrode of the second rectifier diode D2, and the anode of the second rectifier diode D2 links to each other with alternating-current voltage source 200.The end of the first divider resistance R1 is connected between the negative electrode of the negative electrode of the first rectifier diode D1 and the second rectifier diode D2, and the other end is by the second divider resistance R2 ground connection.
Second operational amplifier A 2 comprises first in-phase input end 40, second in-phase input end 42, inverting input 44 and output 45.First in-phase input end 40 links to each other with output 45.Second in-phase input end 42 links to each other with reference voltage unit 202, and it is used to receive second reference voltage V
Ref2Inverting input 44 links to each other with the in-phase input end 30 of first operational amplifier A 1.Electronic switch 204 is connected between the control end 215 of the output 45 of second operational amplifier A 2 and pwm unit 205, be used for conducting or cut off the output 45 of second operational amplifier A 2 and the control end 215 of pwm unit 205 between electric connection.
One end of light-emitting component 400 connects voltage transformation module 24, other end ground connection.In the present embodiment, light-emitting component 400 comprise a plurality of light-emitting diode Ld1, Ld2 that are connected in series ... Ldn.
The operation principle of drive unit 300 is as follows:
The first rectifier diode D1 and the second rectifier diode D2 carry out rectification to the alternating current of light modulation unit 12 modulating transformations, to produce the detecting direct current.The first divider resistance R1 and the second divider resistance R2 carry out dividing potential drop to the detecting direct current, to produce detecting voltage V
Acin
The in-phase input end 30 of first operational amplifier A 1 receives detecting voltage V
Acin, will detect voltage V
AcinWith first reference voltage V
Ref1Compare, at detecting voltage V
AcinLess than first reference voltage V
Ref1In time, exports first level signal and gives electronic switch 204, and at detecting voltage V
AcinGreater than first reference voltage V
Ref1In time, exports second level signal and gives electronic switch 204.In the present embodiment, first level signal is the low level voltage signal, and second level signal is the high level voltage signal.
The inverting input 44 of second operational amplifier A 2 receives detecting voltage V
Acin, and will detect voltage V
AcinWith second reference voltage V
Ref2Compare, at detecting voltage V
AcinLess than second reference voltage V
Ref2The time produce the control voltage that magnitude of voltage increases with the detecting voltage linear, pulsewidth light modulation unit 205 is used to receive primary direct current working on power, and receives control voltage to produce the pulse voltage that duty ratio increases with the control voltage linear when electronic switch 204 conductings.Second operational amplifier A 2 is also exported this detecting voltage when detecting voltage greater than second reference voltage, pulsewidth light modulation unit 205 receives this detecting voltage to produce the constant pulse voltage of duty ratio when electronic switch 204 conductings.
Those skilled in the art will be appreciated that; above execution mode only is to be used for illustrating the present invention; and be not to be used as limitation of the invention; as long as within connotation scope of the present invention, appropriate change and the variation that above embodiment did all dropped within the scope of protection of present invention.
Claims (10)
1. drive unit, it comprises the light modulation unit, rectification filtering unit and voltage transformation module, the input AC electricity that this light modulation unit is used for AC power is provided carries out modulating transformation, to produce the modulation alternating current, this rectification filtering unit is used for the modulation alternating current is carried out rectification and filtering, to produce primary direct current, it is characterized in that: this drive unit also comprises rectification and voltage division unit and driver element, this rectification and voltage division unit is used for this modulation alternating current is carried out rectification and dividing potential drop, to produce detecting voltage, this driver element is used to receive primary direct current to work on power, and produce duty ratio with detecting the pulse voltage that voltage changes, this voltage transformation module is used for according to pulse voltage primary direct current being transformed to driving voltage, and this driving voltage is provided for light-emitting component.
2. drive unit as claimed in claim 1 is characterized in that: the operating frequency of this driver element is 20KHz～100KHz.
3. drive unit as claimed in claim 1, it is characterized in that: this light modulation unit comprises controllable silicon dimmer and circuits for triggering, this controllable silicon dimmer comprises the gate that links to each other with circuits for triggering, anode that links to each other with alternating-current voltage source and the negative electrode that links to each other with the rectification and voltage division unit with rectification filtering unit, these circuits for triggering are used for applying forward triggering signal and negative sense triggering signal for respectively the gate of controllable silicon dimmer, to control positive half period and the negative half-cycle conducting of controllable silicon dimmer respectively at the input AC electricity, by changing the mode that excites the angle of controllable silicon dimmer, realize adjusting to the light-emitting component luminosity.
4. drive unit as claimed in claim 1, it is characterized in that: this driver element comprises pulsewidth light modulation unit, be used to provide the reference voltage unit of first reference voltage and second reference voltage, first comparing unit, second comparing unit and be connected in electronic switch between second comparing unit and the pwm unit, the magnitude of voltage of this first reference voltage is less than the magnitude of voltage of second reference voltage, this first comparing unit is used for the detecting voltage and first reference voltage are compared, when detecting voltage, produce first level signal less than first reference voltage, and produce second level signal during greater than first reference voltage at detecting voltage, this electronic switch based on first level signal and second level signal is cut off respectively and conducting second comparing unit and pwm unit between electric connection, this second comparing unit is used for the detecting voltage and second reference voltage are compared, when detecting voltage, produce the control voltage that magnitude of voltage increases with the detecting voltage linear less than second reference voltage, this pulsewidth light modulation unit is used to receive primary direct current working on power, and receives control voltage to produce the pulse voltage that duty ratio increases with the control voltage linear when the electronic switch conducting.
5. drive unit as claimed in claim 4, it is characterized in that: this second comparing unit also is used for exporting this detecting voltage when detecting voltage greater than second reference voltage, and this pulsewidth light modulation unit receives this detecting voltage to produce the invariable pulse voltage of duty ratio when the electronic switch conducting.
6. drive unit as claimed in claim 5, it is characterized in that: this first comparing unit comprises first operational amplifier, this second comparing unit comprises second operational amplifier, the inverting input of this first operational amplifier is used to receive first reference voltage, the in-phase input end of this first operational amplifier is used to receive this detecting voltage, the output of this first operational amplifier links to each other with electronic switch, this second operational amplifier comprises first in-phase input end, second in-phase input end, inverting input and output, this first in-phase input end links to each other with the output of second operational amplifier, this second in-phase input end is used to receive second reference voltage, the inverting input of this second operational amplifier links to each other with the in-phase input end of first operational amplifier, and this electronic switch is connected between the output and pulsewidth light modulation unit of second operational amplifier.
7. drive unit as claimed in claim 1, it is characterized in that: this rectification and voltage division unit comprises first rectifier diode, second rectifier diode, first divider resistance and second divider resistance, the anode of this first rectifier diode links to each other with the light modulation unit, the negative electrode of this first rectifier diode links to each other with the negative electrode of second rectifier diode, the anode of this second rectifier diode links to each other with AC power, one end of this first divider resistance is connected between the negative electrode of the negative electrode of first rectifier diode and second rectifier diode, the other end is by the second divider resistance ground connection, and the voltage at these second divider resistance two ends is detecting voltage.
8. lighting device, it comprises drive unit and light-emitting component, the input AC electricity that this drive unit is used for AC power is provided is transformed to driving voltage, luminous with driven light-emitting element, this drive unit comprises the light modulation unit, rectification filtering unit and voltage transformation module, this light modulation unit is used for this input AC electricity is carried out modulating transformation, to produce the modulation alternating current, this rectification filtering unit is used for the modulation alternating current is carried out rectification and filtering, to produce primary direct current, it is characterized in that: this drive unit also comprises rectification and voltage division unit and driver element, this rectification and voltage division unit is used for this modulation alternating current is carried out rectification and dividing potential drop, to produce detecting voltage, this driver element is used to receive primary direct current to work on power, and produce the pulse voltage that duty ratio changes with detecting voltage, and this voltage transformation module is used for according to pulse voltage primary direct current being transformed to driving voltage, and this driving voltage is provided for light-emitting component.
9. lighting device as claimed in claim 8, it is characterized in that: this driver element comprises the pulse-width modulation unit, be used to provide the reference voltage unit of first reference voltage and second reference voltage, first comparing unit, second comparing unit and be connected in electronic switch between second comparing unit and the pwm unit, the magnitude of voltage of this first reference voltage is less than the magnitude of voltage of second reference voltage, this first comparing unit is used for the detecting voltage and first reference voltage are compared, when detecting voltage, produce first level signal less than first reference voltage, and produce second level signal during greater than first reference voltage at detecting voltage, this electronic switch based on first level signal and second level signal is cut off respectively and conducting second comparing unit and pwm unit between electric connection, this second comparing unit is used for the detecting voltage and second reference voltage are compared, when detecting voltage, produce the control voltage that magnitude of voltage increases with the detecting voltage linear less than second reference voltage, this pulse-width modulation unit is used to receive primary direct current to work on power, and when the electronic switch conducting, receive control voltage to produce the pulse voltage that duty ratio increases with the control voltage linear, this second comparing unit also is used for exporting this detecting voltage when detecting voltage greater than second reference voltage, this pulse-width modulation unit receives this detecting voltage to produce the invariable pulse voltage of duty ratio when the electronic switch conducting.
10. lighting device as claimed in claim 9, it is characterized in that: this first comparing unit comprises first operational amplifier, this second comparing unit comprises second operational amplifier, the inverting input of this first operational amplifier is used to receive first reference voltage, the in-phase input end of this first operational amplifier is used for receiving detecting voltage, the output of this first operational amplifier links to each other with electronic switch, this second operational amplifier comprises first in-phase input end, second in-phase input end, inverting input and output, this first in-phase input end links to each other with the output of second operational amplifier, this second in-phase input end is used to receive second reference voltage, the inverting input of this second operational amplifier links to each other with the in-phase input end of first operational amplifier, and this electronic switch is connected between the output and pulse-width modulation unit of second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101768493A CN102026440A (en) | 2009-09-22 | 2009-09-22 | Driving device and illuminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101768493A CN102026440A (en) | 2009-09-22 | 2009-09-22 | Driving device and illuminating device |
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| CN102026440A true CN102026440A (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101768493A Pending CN102026440A (en) | 2009-09-22 | 2009-09-22 | Driving device and illuminating device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510618A (en) * | 2011-10-27 | 2012-06-20 | 惠州雷士光电科技有限公司 | Semiconductor lighting driving circuit, semiconductor lighting device, and dimming method for semiconductor lighting device |
| CN102665325A (en) * | 2012-04-12 | 2012-09-12 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, backlight module and liquid crystal display device |
| CN103517531A (en) * | 2013-10-15 | 2014-01-15 | 矽力杰半导体技术(杭州)有限公司 | Dimming method and circuit and controllable silicon dimming circuit with circuit |
| US9426862B2 (en) | 2012-04-12 | 2016-08-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight drive circuit, liquid crystal display device and driving method |
| CN109033915A (en) * | 2018-08-06 | 2018-12-18 | 上海易钥电子科技有限公司 | A kind of storable double frequency temperature label of low-power consumption |
| CN111181642A (en) * | 2020-02-17 | 2020-05-19 | 海信（山东）冰箱有限公司 | Refrigerator and optical signal transmission system thereof |
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| CN101420802A (en) * | 2008-12-02 | 2009-04-29 | 深圳市亮百佳电子科技有限公司 | The LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator |
| US20090195168A1 (en) * | 2008-02-05 | 2009-08-06 | Intersil Americas Inc. | Method and system for dimming ac-powered light emitting diode (led) lighting systems using conventional incandescent dimmers |
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| US20090195168A1 (en) * | 2008-02-05 | 2009-08-06 | Intersil Americas Inc. | Method and system for dimming ac-powered light emitting diode (led) lighting systems using conventional incandescent dimmers |
| CN101330785A (en) * | 2008-08-04 | 2008-12-24 | 梁莉丽 | High voltage AC light-adjusting controller for general constant-current LED |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510618A (en) * | 2011-10-27 | 2012-06-20 | 惠州雷士光电科技有限公司 | Semiconductor lighting driving circuit, semiconductor lighting device, and dimming method for semiconductor lighting device |
| CN102510618B (en) * | 2011-10-27 | 2014-10-29 | 惠州雷士光电科技有限公司 | Semiconductor lighting driving circuit and semiconductor lighting device |
| CN102665325A (en) * | 2012-04-12 | 2012-09-12 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, backlight module and liquid crystal display device |
| CN102665325B (en) * | 2012-04-12 | 2015-03-11 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, backlight module and liquid crystal display device |
| US9426862B2 (en) | 2012-04-12 | 2016-08-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight drive circuit, liquid crystal display device and driving method |
| CN103517531A (en) * | 2013-10-15 | 2014-01-15 | 矽力杰半导体技术(杭州)有限公司 | Dimming method and circuit and controllable silicon dimming circuit with circuit |
| US9198245B2 (en) | 2013-10-15 | 2015-11-24 | Silergy Semiconductor Technology (Hangzhou) Ltd | Dimming method and circuit and controlled-silicon dimming circuit with the same |
| CN109033915A (en) * | 2018-08-06 | 2018-12-18 | 上海易钥电子科技有限公司 | A kind of storable double frequency temperature label of low-power consumption |
| CN111181642A (en) * | 2020-02-17 | 2020-05-19 | 海信（山东）冰箱有限公司 | Refrigerator and optical signal transmission system thereof |
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