CN101938865A - Dimmable light-emitting diode device used for reducing output ripple current and driving circuit thereof - Google Patents
Dimmable light-emitting diode device used for reducing output ripple current and driving circuit thereof Download PDFInfo
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- CN101938865A CN101938865A CN2009101507402A CN200910150740A CN101938865A CN 101938865 A CN101938865 A CN 101938865A CN 2009101507402 A CN2009101507402 A CN 2009101507402A CN 200910150740 A CN200910150740 A CN 200910150740A CN 101938865 A CN101938865 A CN 101938865A
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Abstract
The invention discloses a dimmable light-emitting diode device used for reducing output ripple current, which comprises a light-emitting diode module, a phase tuning module, a voltage conversion module, a driver module and a feedback module. A flyback converter in the voltage conversion module is provided with a secondary clockwise winding and a phase cutoff sensing circuit so as to provide sensing voltage serving as an output current reference standard of the light-emitting diode module. The dimmable light-emitting diode device can make the flayback converter with the phase dimming function greatly increase output capacity and reduce the output ripple current, so that the light-emitting diode has stable light output. Therefore, the dimmable light-emitting diode device can prolong the service life of the dimmable light-emitting diode and prevent a light source flicker index from changing low.
Description
[technical field]
The invention relates to a kind of light-emitting diode assembly, particularly relevant for a kind of light-emitting diode assembly and drive circuit thereof in order to the tunable optical that reduces the output ripple electric current.
[background technology]
The luminosity of conventional bulb is determined by the size of current of importing bulb at present, therefore known technology development the bulb of brightness-adjusting, utilize an interchange dimmer earlier the AC power of civil power input to be carried out exporting a phase modulation AC power behind the phase modulation, the user can utilize and exchange on the dimmer set control assembly and control the interchange dimmer, the phase place of modulation AC power makes bulb obtain the phase modulation AC power and shinny and control its brightness.
The brightness of bulb is to determine according to the phase modulation AC power that the interchange dimmer is exported.If resulting voltage quasi position is less behind the phase modulation, the electric current of then importing bulb also diminishes relatively, thereby the brightness of conventional bulb is reduced; Otherwise, then can increase its brightness if improve resulting voltage quasi position.
Therefore light emitting diode illuminating apparatus replaces conventional bulb gradually now, and the brightness of light-emitting diode also is proportional to its conducting electric current, adjusts the electric current that LED drive outputs to light-emitting diode and can adjust light output size.Yet because of the type of drive and the conventional bulb of general light emitting diode illuminating apparatus differs widely, therefore utilization exchanges dimmer and is not suitable on the light emitting diode illuminating apparatus, is the brightness that can't easily adjust light emitting diode illuminating apparatus with the user.
The phase dimming LED drive that the converter of speeding is returned in the known technology utilization only can be used the input and the output capacitor of little capacitance, with the phase dimming function that carries out.The shortcoming that capacity output is little is that to output to the current ripple of light-emitting diode bigger, and the conference of output current ripple causes light-emitting diode overheated and shorten useful life; Even cause light output unstable and the luminous existing picture of flicker arranged.
Therefore, Technology Need is improved above-mentioned LED driving circuit now, with raising I/O capacitance, and the ripple composition of minimizing light-emitting diode output current.
[summary of the invention]
Based on above-mentioned, the objective of the invention is to be to provide a kind of light-emitting diode assembly and drive circuit thereof of tunable optical, can effectively reduce the ripple composition of output current.
The present invention discloses a kind of light-emitting diode (LED) drive circuit in order to the tunable optical that reduces ripple current, comprising: a phase dimming module, and phase modulation one AC power is to obtain the alternating voltage of a phase modulation; One voltage transformation module is coupled to the phase dimming module, converts the alternating voltage of phase modulation to one first direct voltage; One driver module is coupled to voltage transformation module, receives first direct voltage, use to drive a light-emitting diode (LED) module, and according to the phase modulation information from the phase dimming module, an output current of control light-emitting diode (LED) module; Wherein voltage transformation module has a flyback converter (flyback converter), and wherein the flyback converter comprises forward winding of at least one secondary side, so that a detecting voltage to be provided, with as the output current of light-emitting diode (LED) module one with reference to accurate position.
The present invention also discloses a kind of light-emitting diode assembly in order to the tunable optical that reduces ripple current, comprising: a light-emitting diode (LED) module; One phase dimming module, phase modulation one AC power is to obtain the alternating voltage of a phase modulation; One voltage transformation module is coupled to phase dimming module and light-emitting diode (LED) module, converts the alternating voltage of phase modulation to one first direct voltage; One driver module is coupled to this voltage transformation module, receives first direct voltage, uses the driven for emitting lights diode (led) module, and according to the phase modulation information from the phase dimming module, an output current of control light-emitting diode (LED) module; One back coupling module is coupled to driver module and light-emitting diode (LED) module, measures output current, and the information that output current is provided is used the output current of adjusting light-emitting diode (LED) module to driver module; Wherein voltage transformation module has a flyback converter, and wherein the flyback converter comprises forward winding of at least one secondary side, so that a detecting voltage to be provided, with as the output current of light-emitting diode (LED) module one with reference to accurate position.
Light-emitting diode assembly of the present invention increases by one group of secondary side forward winding and phase angle circuit for detecting in returning the converter of speeding, to provide output current one with reference to accurate position, can effectively reduce the ripple composition of light-emitting diode output current.
Light-emitting diode assembly of the present invention can make to have returning of the phase dimming function converter of speeding and significantly increases the capacitance of output, reduces the output current ripple, makes light-emitting diode that stable light output be arranged.Therefore, the present invention can prolong light-emitting diode useful life and avoid its light source scintillation index (Flicker Index) variation.
Moreover, and the present invention need not use microprocessor (MCU) be may command light modulation gain, can enlarge the scope of the accurate position of low light modulation, promote energy-saving effect, and can with existing dimmer coupling.
The present invention uses the light modulation of secondary side simulation control circuit, is different from primary side (input) detection techniques, does not need the extra barrier assemblies such as using optical coupling that increases; Can further reach product miniaturization and simplification demand.
For the features and advantages of the present invention can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphicly, be described in detail below.
[description of drawings]
Accompanying drawing 1 is according to embodiments of the invention, is the calcspar in order to the light-emitting diode assembly of the tunable optical that reduces ripple current.
Accompanying drawing 2 is according to embodiments of the invention, is the circuit diagram in order to the light-emitting diode assembly of the tunable optical that reduces ripple current.
Accompanying drawing 3 (a)-(d) is the various voltage signal schematic diagrames in the accompanying drawing 2 according to embodiments of the invention.
Accompanying drawing 4 is the circuit diagram of phase angle circuit for detecting in the accompanying drawing 2 according to embodiments of the invention.
Accompanying drawing 5 is the circuit diagram in order to the light-emitting diode assembly of the tunable optical that reduces ripple current according to another embodiment of the present invention.
Accompanying drawing 6 is the output current schematic diagram of light-emitting diode.
Accompanying drawing 7 is the output current schematic diagram of the light-emitting diode assembly in order to the tunable optical that reduces ripple current of the present invention.
Among the figure:
100 light-emitting diode assemblies
110 phase dimming modules
120 voltage transformation modules
122 bridge rectifiers
124 speed returns converter
126 phase angle detecting units
130 driver modules
132 Active PFC unit
140 light-emitting diode (LED) modules;
150 back coupling modules;
152 control units
154 optical coupling back coupling unit
[embodiment]
The present invention utilizes based on single-stage high-power-factor to return the converter of speeding (Single stage PFC-Flybackconverter) circuit and the LED drive made, according to line voltage amplitude and Waveform Control input current, can significantly lower phase distortion and wave distortion between input current and line voltage, and improve power factor; Reduce the virtual work loss and reach energy-saving effect.
The LED driving circuit of utilization of the present invention utilizes single-stage high-power-factor to return the converter circuit of speeding, and carries out the function of light modulation applicable to the phase dimmer of civil power.No matter the leading edge of input voltage signal or trailing edge phase angle (Leading edge or Trailing edge) is when being blocked by phase dimmer, the output current of LED drive also can be in real time, equiphase is ended; Make the light of light-emitting diode export the reduction of equal proportion.
LED driving circuit of the present invention increases forward winding (Secondary forward winding) of last one group of secondary side in returning the converter of speeding, in the phase angle phase (Phase cut-off period) of its output detecting dimmer, adjust the accurate position of output current control synchronously; Making the single-stage high-power-factor with phase dimming function return the converter of speeding can significantly increase capacity output, effectively reduces the ripple composition of light-emitting diode output current.
With reference to accompanying drawing 1,, be square Figure 100 in order to the light-emitting diode assembly of the tunable optical that reduces ripple current according to embodiments of the invention.Light-emitting diode assembly of the present invention comprises phase dimming module 110, voltage transformation module 120, driver module 130, light-emitting diode (LED) module 140 and feedbacks module 150.
After outside AC power sees through the phase place of phase dimming module 110 its voltage signals of adjustment, see through voltage transformation module 120 and convert direct voltage to.The direct voltage of conversion provides to driver module 130 and light-emitting diode (LED) module 140, with driven for emitting lights diode (led) module 140, and the brightness (output current) of adjustment light-emitting diode (LED) module 140.Driver module 130 sees through voltage transformation module 120 according to the phase modulation information of phase dimming module 110, the output current of control light-emitting diode (LED) module 140.Back coupling module 150 is then detected the output current of light-emitting diode (LED) module 140, and its output current information is provided to driver module 130, keeps predetermined value to adjust above-mentioned output current.
Above-mentioned phase dimming module 110 is alternating voltage or the current values that are used for the phase modulation input, in preferred embodiment, above-mentioned phase dimming module comprises an off-line phase dimmer (off-linephase dimmer), and it is coupled to AC power and power transfer module 120.Voltage transformation module 120 is to be used for voltage conversion function, and the voltage transitions of importing is become another kind of state (for example exchange and convert direct current to).In preferred embodiment, above-mentioned voltage transformation module 120 comprises a bridge rectifier and a flyback converter (flyback converter).Voltage transformation module 120 is coupled in phase dimming module 110 and light-emitting diode (LED) module 140, the alternating voltage of phase modulation is converted to the direct voltage of identical or different accurate position.After the alternating voltage of phase modulation is rectified into direct voltage through bridge rectifier earlier, sees through the flyback converter again direct voltage is sent to the output voltage that light-emitting diode can be used.
130 of driver modules are to be used for driven for emitting lights diode (led) module 140, and the output current of control light-emitting diode.Driver module 130 is coupled to voltage transformation module 120 and feedbacks module 150, be received from the switched direct voltage of voltage transformation module 120 after, according to the information of above-mentioned phase modulation, control light-emitting diode (LED) module 140.In preferred embodiment, driver module 130 comprises Active PFC unit (PFC IC) and power switch.The loss that the Active PFC unit is caused when being used to reduce voltage transitions improves outside the power factor (PF) of circuit, and provides a switching signal to power switch, uses the driven for emitting lights diode (led) module.Power switch then is according to above-mentioned switching signal, and the frequency of the voltage transitions of the flyback converter of control electric pressure converter 120 is used driven for emitting lights diode (led) module 140.
According to preferred embodiment, the 2nd figure is the circuit diagram in order to the light-emitting diode assembly 100 of the tunable optical that reduces ripple current.By the alternating voltage V that the outside provided
Ac(shown in accompanying drawing 3 (A)) provides to phase dimming module 110, and via behind the phase modulation, the alternating voltage of modulation one phase modulation.
As primary side winding N forward
P1During conducting, diode D then
OutBackward stop is not so there is voltage to export light-emitting diode (LED) module 140 to.As primary side winding N forward
P1End, then can provide a back-emf to the reverse winding N of secondary side
S1, to provide to light-emitting diode (LED) module 140.
Secondary side is winding N forward
S2Be coupled to phase angle circuit for detecting 126, when the transformer primary side forward winding be Np1 circle, secondary is surveyed when forward winding is the Ns2 circle, surveys forward winding N according to transformer principle at secondary
S2Obtaining detecting voltage (as the 3rd (C) figure) is:
V
det＝V
in*Ns2/Np1；
Detecting voltage V
DetAfter handling, phase angle circuit for detecting 126 produces reference voltage V
C-ref(shown in accompanying drawing 3 (d)) is as light-emitting diode (LED) module 130 output current I
LEDThe accurate position of reference.By accompanying drawing 3 (d) as seen when conduction period is D (D≤1), reference voltage V
C-refAccurate position be IHL; When being 1-D during the phase angle, reference voltage V
C-refAccurate position is ILL.Therefore, can be with the output current I of light-emitting diode (LED) module 140
LED, do the modulation of same ratio according to voltage turn-on angle ratio, and reach the purpose of light modulation; Calculating formula is as follows:
I
LED＝IHL*D+ILL*(1-D)
With reference to the 4th figure,, be the circuit diagram of phase angle circuit for detecting 126 according to preferred embodiment.First resistance R
1First end be connected to diode D
1With capacitor C
1, its second end is connected to second resistance R
2First end.Second end of second resistance is connected to an earth potential.The first transistor Q
1Base stage be connected to second resistance R
2First end, the first transistor Q
1Emitter-base bandgap grading be connected to earth potential.The 3rd resistance R
3First end be connected to the first supply voltage V
Cc, the 3rd resistance R
3Second end be connected to the first transistor Q
1The collection utmost point.The 4th resistance R
4First end be connected to the first transistor Q
1The collection utmost point and the 3rd resistance R
3Second end, the 4th resistance R
4Second end be connected to earth potential.Transistor seconds Q
2Gate be connected to the 4th resistance R
4First end, transistor seconds Q
2Source electrode be connected to earth potential.The 5th resistance R
5First end be connected to transistor seconds Q
2Drain, second end of the 5th resistance is connected at least one output of phase angle circuit for detecting 126.Second capacitor C
2First end be connected to the 5th resistance R
5Second end and at least one output of phase angle circuit for detecting 126, second capacitor C
2Second end be connected to earth potential.The 6th resistance R
6First end be connected to one second supply voltage V
Ref, the 6th resistance R
6Second end be connected at least one output of phase angle circuit for detecting 126.The 7th resistance R
7First end be connected at least one output of phase angle circuit for detecting 126, the 7th resistance R
7Second end be connected to earth potential.
Phase angle circuit for detecting 126 is connected to forward winding N of secondary side
S2Secondary side is winding N forward
S2Detecting voltage V
DetVoltage is through diode D
1With capacitor C
1After rectification and the filtering, but equal proportion is with the waveform sampling of first direct voltage of being imported of primary side.Above-mentioned detecting voltage V
DetThrough resistance R
1With R
2After the dividing potential drop, input to the first transistor Q
1Gate.If this R
2Dividing potential drop less than gate voltage V
BEO(about 0.6V), then transistor Q
1End transistor Q
2Conducting, the reference voltage V that makes 126 outputs of phase angle circuit for detecting
RefReduce.Therefore, export output current I to
LEDThe accurate position of electric current also can reduce to scale, effectively reduce output current I
LEDCompany's wave component.
Feedback resistance R
CsBe connected to light-emitting diode (LED) module 140, the output current I of detecting light-emitting diode (LED) module 140
LED, and produce feedback voltage in view of the above, use adjustment output current ILED and keep in the preset range.Control unit 152 is connected to feedback resistance R
Cs, light-emitting diode (LED) module 152, phase angle circuit for detecting 126 and optical coupling feedback unit 154.Control unit 152 is according to the self-feedback resistance R
CsThe reference voltage V that feedback voltage that is provided and phase angle circuit for detecting are provided
C-ref, produce control signal V
Crtl, to adjust output current I
LEDOptical coupling back coupling unit 154 is received from the control signal V that control unit transmits
Crtl, and convert thereof into light signal, provide to Active PFC unit 132.In another preferred embodiment, also at least one output of phase angle circuit for detecting 126 can be connected to feedback resistance R
Cs, shown in the 5th figure.
The present invention's one group of secondary on the transformer that single-stage high-power-factor returns the converter of speeding increases is surveyed forward winding, phase angle circuit for detecting, can allow the output capacitor that is connected to light-emitting diode (LED) module can increase to thousands of farads, make the electric current that exports light-emitting diode to significantly reduce, can be with reference to known technology and the of the present invention comparison of accompanying drawing 6 with accompanying drawing 7, when the light-emitting diode assembly of known technology during 90 ° of light modulations current ripple be ± 100%, and light-emitting diode assembly of the present invention effectively reduces to the ripple composition ± 40%; Also can adjust company's wave component that capacity output reduces the light-emitting diode output current according to practical application.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; in not breaking away from spirit of the present invention and protection range; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim book person of defining.
Claims (9)
1. the LED driving circuit in order to the tunable optical of reduction ripple current is characterized in that, comprising:
One phase dimming module, phase modulation one AC power is to obtain the alternating voltage of a phase modulation;
One voltage transformation module is coupled to this phase dimming module, converts the alternating voltage of this phase modulation to one first direct voltage; And
One driver module is coupled to this voltage transformation module, receives this first direct voltage, uses to drive a light-emitting diode (LED) module, and according to the phase modulation information of this phase dimming module certainly, controls an output current of this light-emitting diode (LED) module;
Wherein this voltage transformation module has a flyback converter, and wherein this flyback converter comprises forward winding of at least one secondary side, so that a detecting voltage to be provided, with as this output current of this light-emitting diode (LED) module one with reference to accurate position.
2 LED driving circuit in order to the tunable optical that reduces ripple current as claimed in claim 1 is characterized in that wherein this voltage transformation module comprises:
One phase angle circuit for detecting is coupled to forward winding of this at least one secondary side, detects this phase modulation information, producing a reference voltage to this light-emitting diode (LED) module, with as this of this output current of this light-emitting diode (LED) module with reference to accurate position; And
One bridge rectifier is coupled in this phase dimming module and this flyback converter, converts this first direct voltage in order to the alternating voltage with this phase modulation;
Wherein this phase angle circuit for detecting more comprises:
One first resistance;
One second resistance, first end of this second resistance is connected to this first resistance, and second end of this second resistance is connected to an earth potential;
One the first transistor, the base stage of this first transistor are connected to first end of this second resistance, and the emitter-base bandgap grading of this first transistor is connected to this earth potential;
One the 3rd resistance, first end of the 3rd resistance are connected to one first supply voltage, and second end of the 3rd resistance is connected to the collection utmost point of this first transistor;
One the 4th resistance, first end of the 4th resistance are connected to the collection of this first transistor and second end of the 3rd resistance, and second end of the 4th resistance is connected to this earth potential;
One transistor seconds, the gate of this transistor seconds are connected to first end of the 4th resistance, and the source electrode of this transistor seconds is connected to this earth potential;
One the 5th resistance, first end of the 5th resistance is connected to the drain of this transistor seconds, and second end of the 5th resistance is connected at least one output of this phase angle circuit for detecting;
One second electric capacity, first end of this second electric capacity are connected to second end of the 5th resistance and this at least one output of this phase angle circuit for detecting, and second end of this second electric capacity is connected to earth potential;
One the 6th resistance, first end of the 6th resistance are connected to one second supply voltage, and second end of the 6th resistance is connected to this at least one output of this phase angle circuit for detecting; And
One the 7th resistance, first end of the 7th resistance are connected to this at least one output of this phase angle circuit for detecting, and second end of the 7th resistance is connected to this earth potential.
3. the LED driving circuit in order to the tunable optical that reduces ripple current as claimed in claim 1, it is characterized in that, wherein more comprise a back coupling module, be coupled to this driver module and this light-emitting diode (LED) module, measure this output current, and the information that this output current is provided is to this driver module, uses this output current of adjusting this light-emitting diode (LED) module, and wherein this back coupling module comprises:
One feedback resistance, be coupled to this light-emitting diode (LED) module, use and produce a feedback voltage, wherein this feedback resistance is coupled between this a phase angle circuit and the control unit, use this output current of adjusting this light-emitting diode (LED) module, this control unit is coupled to this feedback resistance and this light-emitting diode (LED) module, according to this feedback voltage with this with reference to standard, produce a control signal, to adjust the electric current of this light-emitting diode (LED) module;
One optical coupling back coupling unit, be coupled to this control unit, receive this control signal and change this control signal and become light signal, to provide to this driver module, wherein this driver module comprises an Active PFC unit, is coupled to this voltage transformation module, uses the power factor (PF) that promotes this voltage transformation module, and a switching signal is provided, in order to drive this light-emitting diode (LED) module; And
One power switch is coupled to this flyback converter, according to this switching signal that this Active PFC unit is provided, uses driving this light-emitting diode (LED) module.
4. the LED driving circuit in order to the tunable optical that reduces ripple current as claimed in claim 1 is characterized in that wherein this phase dimming module comprises an off-line phase dimmer, and it is coupled to this AC power and this power transfer module.
5. the LED driving circuit in order to the tunable optical that reduces ripple current as claimed in claim 1, it is characterized in that, wherein this flyback converter is changed the accurate position of this first direct voltage and is exported one second direct voltage to this light-emitting diode (LED) module, and this flyback converter comprises:
One group of primary side is winding forward, receives this first direct voltage, in order to the accurate position of changing this first direct voltage and export this second direct voltage to this flyback converter secondary side; And
One group of reverse winding of secondary side, magnetic couplings is once surveyed forward winding to this, to produce this second direct voltage.
6. the light-emitting diode assembly in order to the tunable optical of reduction ripple current is characterized in that, comprising:
One light-emitting diode (LED) module;
One phase dimming module, phase modulation one AC power is to obtain the alternating voltage of a phase modulation;
One voltage transformation module is coupled to this phase dimming module and this light-emitting diode (LED) module, converts the alternating voltage of this phase modulation to one first direct voltage;
One driver module is coupled to this voltage transformation module, receives this first direct voltage, uses to drive this light-emitting diode (LED) module, and according to the phase modulation information of this phase dimming module certainly, controls an output current of this light-emitting diode (LED) module; And
One back coupling module is coupled to this driver module and this light-emitting diode (LED) module, measures this output current, and the information that this output current is provided is used this output current of adjusting this light-emitting diode (LED) module to this driver module;
Wherein this voltage transformation module has a flyback converter, and wherein this flyback converter comprises forward winding of at least one secondary side, so that a detecting voltage to be provided, with as this output current of this light-emitting diode (LED) module one with reference to accurate position.
7. the light-emitting diode assembly in order to the tunable optical that reduces ripple current as claimed in claim 6 is characterized in that wherein this voltage transformation module comprises:
One phase angle circuit for detecting is coupled to forward winding of this at least one secondary side, detects this phase modulation information, producing a reference voltage to this light-emitting diode (LED) module, with as this of this output current of this light-emitting diode (LED) module with reference to accurate position; And
One bridge rectifier is coupled in this phase dimming module and this flyback converter, converts this first direct voltage in order to the alternating voltage with this phase modulation;
Wherein this phase angle circuit for detecting more comprises:
One first resistance;
One second resistance, first end of this second resistance is connected to this first resistance, and second end of this second resistance is connected to an earth potential;
One the first transistor, the base stage of this first transistor are connected to first end of this second resistance, and the emitter-base bandgap grading of this first transistor is connected to this earth potential;
One the 3rd resistance, first end of the 3rd resistance are connected to one first supply voltage, and second end of the 3rd resistance is connected to the collection utmost point of this first transistor;
One the 4th resistance, first end of the 4th resistance are connected to the collection utmost point of this first transistor and second end of the 3rd resistance, and second end of the 4th resistance is connected to this earth potential;
One transistor seconds, the gate of this transistor seconds are connected to first end of the 4th resistance, and the source electrode of this transistor seconds is connected to this earth potential;
One the 5th resistance, first end of the 5th resistance is connected to the drain of this transistor seconds, and second end of the 5th resistance is connected at least one output of this phase angle circuit for detecting;
One second electric capacity, first end of this second electric capacity are connected to second end of the 5th resistance and this at least one output of this phase angle circuit for detecting, and second end of this second electric capacity is connected to earth potential;
One the 6th resistance, first end of the 6th resistance are connected to one second supply voltage, and second end of the 6th resistance is connected to this at least one output of this phase angle circuit for detecting; And
One the 7th resistance, first end of the 7th resistance are connected to this at least one output of this phase angle circuit for detecting, and second end of the 7th resistance is connected to this earth potential.
8. the light emitting diode drive device in order to the tunable optical that reduces ripple current as claimed in claim 6 is characterized in that wherein this back coupling module comprises:
One feedback resistance, be coupled to this light-emitting diode (LED) module, use and produce a feedback voltage, wherein this feedback resistance is coupled between this a phase angle circuit for detecting and the control unit, use this output current of adjusting this light-emitting diode (LED) module, this control unit is coupled to this feedback resistance and this light-emitting diode (LED) module, according to this feedback voltage with this with reference to standard, produce a control signal, to adjust the electric current of this light-emitting diode (LED) module; And
One optical coupling back coupling unit is coupled to this control unit, receives this control signal and change this control signal to become light signal, to provide to this driver module;
Wherein this driver module more comprises:
One Active PFC unit is coupled to this voltage transformation module, uses the power factor (PF) that promotes this voltage transformation module, and a switching signal is provided, in order to drive this light-emitting diode (LED) module; And
One power switch is coupled to this flyback converter, according to this switching signal that this Active PFC unit is provided, uses driving this light-emitting diode (LED) module.
9. the light-emitting diode assembly in order to the tunable optical that reduces ripple current as claimed in claim 6 is characterized in that wherein this phase dimming module comprises an off-line phase dimmer, and it is coupled to this AC power and this power transfer module.
10. the light-emitting diode assembly in order to the tunable optical that reduces ripple current as claimed in claim 6, it is characterized in that, wherein this flyback converter is changed the accurate position of this first direct voltage and is exported one second direct voltage to this light-emitting diode (LED) module, and wherein this flyback converter comprises:
One group of primary side is winding forward, receives this first direct voltage, in order to the accurate position of changing this first direct voltage and export this second direct voltage to this flyback converter secondary side; And
One group of reverse winding of secondary side, magnetic couplings is once surveyed forward winding to this, to produce this second direct voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101507402A CN101938865A (en) | 2009-06-30 | 2009-06-30 | Dimmable light-emitting diode device used for reducing output ripple current and driving circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101507402A CN101938865A (en) | 2009-06-30 | 2009-06-30 | Dimmable light-emitting diode device used for reducing output ripple current and driving circuit thereof |
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| CN101938865A true CN101938865A (en) | 2011-01-05 |
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| CN109922564B (en) * | 2019-02-19 | 2023-08-29 | 昂宝电子（上海）有限公司 | Voltage conversion system and method for TRIAC drive |
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| US11297704B2 (en) | 2019-08-06 | 2022-04-05 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for bleeder control related to TRIAC dimmers associated with LED lighting |
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