CN102065598B - Lighting device, driving circuit of light-emitting diode and driving method thereof - Google Patents
Lighting device, driving circuit of light-emitting diode and driving method thereof Download PDFInfo
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- CN102065598B CN102065598B CN200910224565.7A CN200910224565A CN102065598B CN 102065598 B CN102065598 B CN 102065598B CN 200910224565 A CN200910224565 A CN 200910224565A CN 102065598 B CN102065598 B CN 102065598B
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Abstract
The invention discloses a lighting device, a driving circuit of a light-emitting diode and a driving method for the light-emitting diode, which is suitable for receiving the alternating current power to drive one light-emitting diode. The driving circuit comprises a rectification circuit, a processing unit, an electric energy conversion circuit and a detection unit. The rectification circuit is used for rectifying the alternating current power to output a first working voltage. The processing unit is coupled with the rectification circuit and outputs a second working voltage and a pulse width modulating signal. The electric energy conversion circuit is coupled among the rectification circuit, the processing unit and the light-emitting diode, and the electric energy conversion circuit drives the light-emitting diode according to the pulse width modulating signal. The detection unit is coupled with the rectification circuit and the processing unit for detecting the first working voltage. When the first working voltage is smaller than or equal to one critical voltage, the detection unit outputs the energy forbidding signal to the processing unit to forbid the pulse width modulating signal.
Description
Technical field
The invention relates to a kind of drive circuit and lighting device, and particularly relevant for a kind of for the drive circuit that drives light-emitting diode (light emitting diode, LED) and the lighting device that uses this drive circuit.
Background technology
The volume of light-emitting diode (Light Emitting Diode, LED) is little, power saving and durable, and along with the maturation of processing procedure, prices, recently more and more general as the product of light source with light-emitting diode.In addition, light-emitting diode operating voltage low (only 1.5-3V), can be active luminous and have certain brightness, brightness voltage available or electric current regulate, possess shock-resistant, anti-vibration, the feature in life-span long (100,000 hours) simultaneously, be with, light-emitting diode is widely used in various terminal equipments, from car headlamp, traffic lights, indicator by character, billboard and large-screen video display, to regular grade architectural lighting and the field such as LCD is backlight.
In general lighting application, light-emitting diode can see through dimmer and adjust illumination effect, and through driving chip that electric current is provided.In other words, dimmer can receive alternating current, and provides voltage according to turn-on condition.The voltage that drives chip to export according to dimmer, corresponding adjustment exports the magnitude of current of light-emitting diode to, to reach the object of dimming light-emitting diode.Yet, at the turn-on condition of dimmer, approaching while closing the critical point of light-emitting diode, light-emitting diode has the phenomenon of flicker.
This is that the voltage that dimmer provides can be extremely low because the turn-on condition at dimmer approaches while closing the critical point of light-emitting diode, so that cannot provide enough voltage to driving chip and light-emitting diode.Drive the chip cannot driven light-emitting diode in the situation that of spread of voltage, thereby cause LED flash.
Summary of the invention
The invention provides a kind of drive circuit and lighting device of light-emitting diode, be applicable to the hanging dimmer of conventional wall, can be adjusted to and drive critical value and while causing operating voltage too low, automatically stop driving light-emitting diode, to avoid light flash at dimmer.
The invention provides a kind of driving method of light-emitting diode, can automatically detect the AC power of exporting after dimmer adjustment, when the operating voltage that goes out when the rectification of AC power institute is too low, can make to drive the wide place of the pulse modulation signal anergy of light-emitting diode to stop driving light-emitting diode, avoid whereby light-emitting diode to produce flicker and improve the stability of light modulation.
The present invention proposes a kind of drive circuit of light-emitting diode, is applicable to receive AC power to drive a light-emitting diode.Drive circuit comprises rectification circuit, processing unit, electrical energy conversion circuit and detecting unit.Rectification circuit in order to rectification AC power to export the first operating voltage.Processing unit is coupled to rectification circuit, and exports the second operating voltage and pulse width modulating signal.Electrical energy conversion circuit is coupled between rectification circuit, processing unit and light-emitting diode, and electrical energy conversion circuit drives light-emitting diode according to pulse width modulating signal.Detecting unit is coupled to rectification circuit and processing unit, in order to detect the first operating voltage.When the first operating voltage is less than or equal to a critical voltage, detecting unit export a disable signal to processing unit with forbidden energy pulse width modulating signal.
A kind of lighting device of the another proposition of the present invention, is applicable to receive AC power to throw light on.Lighting device comprises light-emitting diode and drive circuit.Drive circuit couples light-emitting diode, and comprises rectification circuit, processing unit, electrical energy conversion circuit and detecting unit.Rectification circuit in order to rectification AC power to export the first operating voltage.Processing unit is coupled to rectification circuit, and exports the second operating voltage and pulse width modulating signal.Electrical energy conversion circuit is coupled between rectification circuit, processing unit and light-emitting diode, and electrical energy conversion circuit drives light-emitting diode according to pulse width modulating signal.Detecting unit is coupled to rectification circuit and processing unit, in order to detect the first operating voltage.When the first operating voltage is less than or equal to a critical voltage, detecting unit export a disable signal to processing unit with forbidden energy pulse width modulating signal.
In one embodiment of this invention, above-mentioned pulse width modulation circuit is according to disable signal output pulse width modulation signal, and a feedback signal of exporting according to electrical energy conversion circuit is adjusted pulse width modulating signal.
In one embodiment of this invention, above-mentioned processing unit comprises voltage stabilizing circuit and pulse width modulation (PWM) circuit.The output of voltage stabilizing circuit is coupled to pwm unit, and voltage stabilizing circuit is exported the second operating voltage, pwm unit output pulse width modulation signal.
In one embodiment of this invention, above-mentioned voltage stabilizing circuit receives the first operating voltage to export the second operating voltage to pwm unit.
In one embodiment of this invention, above-mentioned detecting unit comprises filter, reference voltage generator and hysteresis comparator.Filter couples rectification circuit, in order to receive the first operating voltage with output comparative voltage.Reference voltage generator couples processing unit, in order to receive the second operating voltage with output reference voltage.Hysteresis comparator couples filter and reference voltage generator, in order to comparison reference voltage and comparative voltage, whether is less than or equal to critical voltage, and exports accordingly disable signal to detect the first operating voltage.
In one embodiment of this invention, above-mentioned filter comprises the first resistance, the second resistance, the first electric capacity, the second electric capacity and the 3rd resistance.The first end of the first resistance couples rectification circuit to receive the first operating voltage.The first end of the second resistance couples the second end of the first resistance, and in the second end output comparative voltage of the second resistance.The first electric capacity is coupled between second end and ground connection of the first resistance.The second electric capacity is coupled between second end and ground connection of the second resistance.The 3rd resistance, it is coupled between second end and ground connection of the first resistance.
In one embodiment of this invention, above-mentioned reference voltage generator comprises the 4th resistance and Zener diode.The first end of the 4th resistance couples processing unit, the second end output reference voltage.Zener diode is coupled between second end and ground connection of the 4th resistance.
In one embodiment of this invention, above-mentioned reference voltage generator comprises the 4th resistance and the 5th resistance.The first end of the 4th resistance couples processing unit, its second end output reference voltage.The 5th resistance is coupled between second end and ground connection of the 4th resistance.
In one embodiment of this invention, above-mentioned processing unit is ASIC(Application Specific Integrated Circuit).
In one embodiment of this invention, above-mentioned electrical energy conversion circuit is reduction voltage circuit, booster circuit or flyback circuit.
The present invention also proposes a kind of driving method of light-emitting diode.In driving method, first rectification AC power is with output services voltage, and receives operating voltage and pulse width modulating signal, with according to operating voltage with pulse width modulating signal output drive signal with driving light-emitting diode.Then, the magnitude of voltage of testing voltage, when operating voltage is less than or equal to critical voltage, forbidden energy pulse width modulating signal is to stop driving light-emitting diode.
Based on above-mentioned, the drive circuit of lighting device provided by the present invention, light-emitting diode and its driving method, can first detect the operating voltage after the rectification of AC power institute, when its operating voltage is less than or equal to critical voltage, just can stop driving light-emitting diode to avoid occurring the problem of light flash.Therefore, drive circuit of the present invention can be set suitable working range, when user adjusts dimmer and makes operating voltage after AC power rectification too low, drive circuit of the present invention can automatically detect and stop driving light-emitting diode, to avoid the problem of light flash, and improve the stability of dimming light-emitting diode with this.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Figure 1A illustrates the lighting device according to one embodiment of the invention.
Figure 1B is the circuit diagram of the lighting device of Figure 1A.
Fig. 1 C is another circuit diagram of the lighting device of Figure 1A.
It is the oscillogram of the first operating voltage and comparative voltage that Fig. 2 to Fig. 5 illustrates.
Fig. 6 illustrates the driving method according to the light-emitting diode of one embodiment of the invention.
Main element symbol description:
100: lighting device
110: light-emitting diode
120: drive circuit
122: rectification circuit
124: detecting unit
124a: filter
124b: reference voltage generator
124c: hysteresis comparator
126: processing unit
126a: voltage stabilizing circuit
126b: pulse width modulation circuit
128: electrical energy conversion circuit
130: power supply
140: dimmer
C1, C2: electric capacity
D1: Zener diode
Vac: AC power
Vs, VDD, Vdc, Vin, Vref: voltage
Sdr: drive signal
Vdis: disable signal
IL: feedback signal
PWMS: pulse width modulating signal
R1～R5: resistance 124C hysteresis comparator
B1, B2: datum mark S601～S604: step
Embodiment
Figure 1A illustrates the system block diagrams according to the lighting device of one embodiment of the invention.Please refer to Figure 1A, lighting device 100 comprises light-emitting diode (light emitting diode, LED) 110 and drive circuit 120.Drive circuit 120 comprises rectification circuit 122, detecting unit 124, processing unit 126, electrical energy conversion circuit 128.In the present embodiment, lighting device 100 more can comprise and dimmer 140, the voltage Vs that wherein dimmer 140 reception power supplys 130 provide, and according to turn-on condition output AC power source Vac.In the present embodiment, dimmer 140 can adopt three-pole AC switch (Tri-electrode AC switch, TRIAC) to implement its function, but is not restricted to this.
In addition, the corresponding brightness value of adjusting light source of TRIAC dimmer sequentially can be divided into nine grades of maximum (MAX), seven sections of first paragraphs to the and minimum (MIN), wherein delay angle (delay angle) α corresponding to each grade.The delay angles alpha more angle of flow is less, represents that the time that dimmer 140 cuts out is longer.That is to say, dimmer 140 utilizes the turn-on condition of adjusting three-pole AC switch TRAIC, so as to adjusting duration of work and the waveform of AC power Vac.Except this, power supply 130 can be the power supply that the AC power used in city or power supply unit provide, but is not restricted to this.
In addition, 122 couples of AC power Vac of the rectification circuit of the present embodiment carry out rectification, and so as to producing the first operating voltage Vdc, and the first operating voltage Vdc is sent to detecting unit 124, processing unit 126 and electrical energy conversion circuit 128.Wherein, when the duration of work of AC power Vac and waveform change, the duration of work of the first operating voltage Vdc and waveform should with change, but due to due to the effect of filter 124a, it is stable that the voltage of the first operating voltage Vdc can maintain.In the present embodiment, rectification circuit 122 can adopt bridge rectifier (bridge rectifier), but is not restricted to this.
In addition, the processing unit 126 of the present embodiment comprises voltage stabilizing circuit 126a and pulse width modulation (pulse width modulation, PWM) circuit 126b.Voltage stabilizing circuit 126a receives the first operating voltage Vdc with the second operating voltage V of stable output
dDto pulse width modulation circuit 126b, in order to pulse width modulation circuit 126b, operate.On the other hand, pulse width modulation circuit 126b is according to the disable signal Vdis of detecting unit 124, and the feedback signal iL that provides of electrical energy conversion circuit 128, produces according to this pulse width modulating signal PWMS to electrical energy conversion circuit 128.In other words, whether pulse width modulation circuit 126b determines output pulse width modulation signal PWMS according to the disable signal Vdis of detecting unit 124, and pulse width modulation circuit 126b can adjust according to feedback signal iL effective duration of work (duty cycle) of pulse width modulating signal PWMS.
Then, electrical energy conversion circuit 128 just can drive light-emitting diode 110, and according to pulse width modulating signal PWMS, adjusts voltage and the electric current of the driving signal Sdr of light-emitting diode 110, to adjust the brightness of light-emitting diode 110.And electrical energy conversion circuit 128 output feedback signal iL are to pulse width modulation circuit 126b, wherein feedback signal iL comprises the voltage of the driving signal Sdr that electrical energy conversion circuit 128 is exported and the state of electric current.In this enforcement demonstration example, electrical energy conversion circuit 128 can be reduction voltage circuit, booster circuit or flyback circuit, also can adopt buck-converter (buck converter) or voltage-boosting converter (boost converter) to implement its function, but be not restricted to this.
In addition, detecting unit 124 can comprise filter 124a and hysteresis comparator 124c.Filter 124a couples rectification circuit 122, in order to receive the first operating voltage Vdc with output comparative voltage Vin.Hysteresis comparator 124c couples filter 124a, in order to comparison reference voltage Vref and comparative voltage Vin, detects the first operating voltage Vdc and whether is less than or equal to critical voltage, and export accordingly disable signal Vdis with this.And detecting unit 124 more can comprise reference voltage generator 124b, it couples processing unit 126, in order to receive the second operating voltage V
dDwith output reference voltage Vref.Wherein, reference voltage Vref can be inputted by outside in other embodiments, but is not restricted to this.
On the other hand, the processing unit 126 of the present embodiment can adopt ASIC(Application Specific Integrated Circuit) (application-specific integrated circuit, ASIC) to realize and implement processing unit 126, but is not restricted to this.The light-emitting diodes pipe driving chip that can model is HV 9910 Supertex in this ASIC(Application Specific Integrated Circuit) is realized, and wherein drives the PWMD pin of chip to receive disable signal Vdis, drives the CS pin receiving feedback signals iL of chip, drives the V of chip
iNpin receives the first operating voltage Vdc, drives the GATE pin output pulse width modulation signal PWMS of chip, and drives the Vdd pin of chip to export the second operating voltage V
dD.The pin definition of above-mentioned driving chip please refer to chip specifications, at this, does not add tired stating.
Figure 1B is the circuit diagram of the lighting device of Figure 1A.Please refer to Figure 1A and Figure 1B, filter 124A can comprise resistance R 1, R2, capacitor C 1, C2 and resistance R 5.Resistance R 1 is coupled between rectification circuit 122 and capacitor C 1, to receive the first operating voltage Vdc.Capacitor C 1 is coupled between resistance R 1 and ground connection GND.Resistance R 2 is coupled to coupling between place and the positive input terminal of hysteresis comparator 124c of capacitor C 1 and resistance R 1.Capacitor C 2 is coupled between the positive input terminal and ground connection GND of hysteresis comparator 124c.Resistance R 5 is coupled between resistance R 1 and ground connection GND.
At the first operating voltage Vdc, through resistance R 1, carry out dividing potential drop and carry out after Order RC filtering through resistance R 1, R2, capacitor C 1, C2 with 5 couples of the first operating voltage Vdc of resistance R, can export comparative voltage Vin to the positive input terminal of hysteresis comparator 124c, wherein comparative voltage Vin can be a direct voltage, and correspond to the first operating voltage Vdc, and can, by the voltage ratio of adjusting resistance R1 and R2, adjust the relation between comparative voltage Vin and the first operating voltage Vdc.The negative input end of hysteresis comparator 124c can receive reference voltage Vref, and makes comparisons with the comparative voltage Vin of its positive input terminal, to determine whether export disable signal Vdis.
Furthermore, when comparative voltage Vin is greater than reference voltage Vref, represent that the first operating voltage Vdc is greater than the critical value (being critical voltage) of brownout.Now, the output of hysteresis comparator 124c can not exported disable signal Vdis, and driving pulse width modulation circuit 126b can normally produce pulse width modulating signal PWMS.When comparative voltage Vin is less than or equal to reference voltage Vref, represent the brownout of the first operating voltage Vdc.Now, the output of hysteresis comparator 124c can be exported disable signal Vdis, with stop pulse width modulation circuit 126b generation pulse width modulating signal PWMS (that is forbidden energy pulse width modulating signal PWMS), light-emitting diode 110 is stopped luminous.Whereby, can prevent that the first operating voltage Vdc is too low and cause light-emitting diode 110 flickers.
It is worth mentioning that, because detecting unit 124 is whether the first operating voltage Vdc that relatively judges that sees through comparative voltage Vin and reference voltage Vref is greater than the critical value of brownout, therefore detecting unit 124 receives reference voltage Vref is relative provides critical voltage, and wherein the relation of reference voltage Vref and critical voltage can be similar in appearance to the relation of the first operating voltage Vdc and comparative voltage Vin.In addition, in the present embodiment for to obtain comparative voltage Vin via Order RC filtering, but can obtain comparative voltage Vin via single order RC filtering or other rectifier systems in other embodiments, the present embodiment is not limited.
In the present embodiment, reference voltage generator 124b by resistance R 3, R4 coupled in series in the second operating voltage V
dDform with ground connection GND.Reference voltage generator 124b is to the second operating voltage V
dDcarry out dividing potential drop and produce reference voltage Vref.In addition, due to the difference of circuit design demand, so the voltage swing of reference voltage Vref can be according to the electrical characteristic adjustment of light-emitting diode 110, or finds applicable reference voltage Vref by experiment.
Fig. 1 C is another circuit diagram of the lighting device of Figure 1A.Please refer to Figure 1B and Fig. 1 C, what they were different is in Zener diode (Zenner diode) D1.Zener diode D1 is coupled between resistance R 3 and ground connection GND, with by the second operating voltage V
dDbe converted to reference voltage Vref, and the level of reference voltage Vref is controlled by the electrical characteristic of Zener diode D1.
Fig. 2 to Fig. 5 illustrates as lighting device 100 is under different delay angles alpha, the oscillogram of the first operating voltage Vdc and comparative voltage Vin.In detail, Fig. 2, Fig. 3, Fig. 4 are respectively with Fig. 5 the situation that (the 6th fragment position of corresponding dimmer) spent in delay angles alpha=26 degree (maximum position of corresponding dimmer), α=54 degree (the 3rd fragment position of corresponding dimmer), α=117 degree (the 5th fragment position of corresponding dimmer) and α=135, wherein datum mark B1 is the datum mark of the first operating voltage Vdc, and datum mark B2 is the datum mark of comparative voltage Vin.As shown in Figure 2, when delay angles alpha=26 are spent, comparative voltage Vin can be about 20V.As shown in Figure 3, when delay angles alpha=54 are spent, comparative voltage Vin can be about 18V.As shown in Figure 4, when delay angles alpha=117 are spent, comparative voltage Vin can be about 6.55V.As shown in Figure 5, when delay angles alpha=135 are spent, comparative voltage Vin can be about 3.75V.Therefore,, when delay angles alpha is larger, comparative voltage Vin can be less.And when comparative voltage Vin is less than or equal to reference voltage Vref, detecting unit 124 can be exported disable signal Vdis, so that pulse width modulation circuit 126b stops producing pulse width modulating signal PWMS.Therefore, can avoid producing unsettled pulse width modulating signal PWMS, and cause LED flash.
In addition, it is the driving method of a light-emitting diode that the embodiment of the invention described above can converge whole, to be applied to the drive circuit 120 of above-mentioned light-emitting diode.Fig. 6 illustrates the driving method according to the light-emitting diode of one embodiment of the invention.Please refer to Fig. 6, in the present embodiment, first rectification AC power is to export the first operating voltage (step S601).Then, receive the first operating voltage and pulse width modulating signal (step S602), with according to the first operating voltage and pulse width modulating signal output drive signal with driving light-emitting diode (step S603).Then, the magnitude of voltage of testing voltage, when the first operating voltage is less than or equal to the critical value of brownout, forbidden energy pulse width modulating signal is to stop driving light-emitting diode (step S604).
In sum, the lighting device that the embodiment of the present invention provides, the drive circuit of light-emitting diode and its driving method, can first detect the operating voltage after the rectification of AC power institute, when the comparative voltage of corresponding operating voltage is less than or equal to critical voltage, just stop driving light-emitting diode to avoid occurring the problem of light flash.Therefore, drive circuit of the present invention can produce pulse width modulating signal in suitable working range, and when user adjusts dimmer and makes operating voltage after AC power rectification too low, drive circuit of the present invention can automatically detect and stop producing pulse width modulating signal to stop driving light-emitting diode, and then avoid the problem of light flash, and improve the stability of dimming light-emitting diode with this.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little modification and perfect, so protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (16)
1. a drive circuit for light-emitting diode, is applicable to receive an AC power to drive a light-emitting diode, and this drive circuit comprises:
One rectification circuit, in order to this AC power of rectification to export one first operating voltage;
One processing unit, be coupled to this rectification circuit, and export one second operating voltage and a pulse width modulating signal, this processing unit comprises a voltage stabilizing circuit and a pulse width modulation (PWM) circuit, wherein the output of this voltage stabilizing circuit is coupled to this pulse width modulation circuit, this voltage stabilizing circuit is exported this second operating voltage, this pulse width modulation circuit is exported this pulse width modulating signal, and this voltage stabilizing circuit receives this first operating voltage to export this second operating voltage to this pulse width modulation circuit;
One electrical energy conversion circuit, is coupled between this rectification circuit, this processing unit and this light-emitting diode, and this electrical energy conversion circuit drives this light-emitting diode according to this pulse width modulating signal; And
One detecting unit, be coupled to this rectification circuit and this processing unit, in order to detect this first operating voltage, when this first operating voltage is less than or equal to a critical voltage, this detecting unit export a disable signal to this processing unit with this pulse width modulating signal of forbidden energy, wherein this critical voltage approaches the critical point of closing light-emitting diode corresponding to the turn-on condition of dimmer, and this AC power is the AC power after adjusting via this dimmer.
2. drive circuit as claimed in claim 1, it is characterized in that, this pulse width modulation circuit determines whether export this pulse width modulating signal according to this disable signal, and a feedback signal of exporting according to this electrical energy conversion circuit is adjusted this pulse width modulating signal.
3. drive circuit as claimed in claim 1, is characterized in that, this detecting unit comprises:
One filter, couples this rectification circuit, in order to receive this first operating voltage to export a comparative voltage;
One reference voltage generator, couples this processing unit, in order to receive this second operating voltage to export a reference voltage; And
One hysteresis comparator, couples this filter and this reference voltage generator, in order to relatively this reference voltage and this comparative voltage, whether is less than or equal to this critical voltage, and exports accordingly this disable signal to detect this first operating voltage.
4. drive circuit as claimed in claim 3, is characterized in that, this filter comprises:
One first resistance, its first end couples this rectification circuit to receive this first operating voltage;
One second resistance, its first end couples the second end of this first resistance, and exports this comparative voltage in the second end of this second resistance;
One first electric capacity, is coupled between second end and a ground connection of this first resistance;
One second electric capacity, is coupled between second end and this ground connection of this second resistance; And
One the 3rd resistance, it is coupled between second end and this ground connection of this first resistance.
5. drive circuit as claimed in claim 3, is characterized in that, this reference voltage generator comprises:
One the 4th resistance, its first end couples this processing unit, and its second end is exported this reference voltage; And
One Zener diode, is coupled between second end and a ground connection of the 4th resistance.
6. drive circuit as claimed in claim 3, is characterized in that, this reference voltage generator comprises:
One the 4th resistance, its first end couples this processing unit, and its second end is exported this reference voltage; And
One the 5th resistance, is coupled between second end and a ground connection of the 4th resistance.
7. drive circuit as claimed in claim 1, is characterized in that, this processing unit is an ASIC(Application Specific Integrated Circuit).
8. drive circuit as claimed in claim 1, is characterized in that, this electrical energy conversion circuit is a reduction voltage circuit, a booster circuit or a flyback (flyback) circuit.
9. a lighting device, is applicable to receive an AC power to throw light on, and this lighting device comprises:
One light-emitting diode; And
One drive circuit, couples this light-emitting diode, and this drive circuit comprises:
One rectification circuit, in order to this AC power of rectification to export one first operating voltage;
One processing unit, be coupled to this rectification circuit, and export one second operating voltage and a pulse width modulating signal, this processing unit comprises a voltage stabilizing circuit and a pulse width modulation (PWM) circuit, wherein the output of this voltage stabilizing circuit is coupled to this pulse width modulation circuit, this voltage stabilizing circuit is exported this second operating voltage, this pulse width modulation circuit is exported this pulse width modulating signal, and this voltage stabilizing circuit receives this first operating voltage to export this second operating voltage to this pulse width modulation circuit;
One electrical energy conversion circuit, is coupled between this rectification circuit, this processing unit and this light-emitting diode, and this electrical energy conversion circuit drives this light-emitting diode according to this pulse width modulating signal; And
One detecting unit, be coupled to this rectification circuit and this processing unit, in order to detect this first operating voltage, when this first operating voltage is less than or equal to a critical voltage, this detecting unit export a disable signal to this processing unit with this pulse width modulating signal of forbidden energy, wherein this critical voltage approaches the critical point of closing light-emitting diode corresponding to the turn-on condition of dimmer, and this AC power is the AC power after adjusting via this dimmer.
10. lighting device as claimed in claim 9, it is characterized in that, this pulse width modulation circuit determines whether export this pulse width modulating signal according to this disable signal, and a feedback signal of exporting according to this electrical energy conversion circuit is adjusted this pulse width modulating signal.
11. lighting devices as claimed in claim 9, is characterized in that, this detecting unit comprises:
One filter, couples this rectification circuit, in order to receive this first operating voltage to export a comparative voltage;
One reference voltage generator, couples this processing unit, in order to receive this second operating voltage to export a reference voltage; And
One hysteresis comparator, couples this filter and this reference voltage generator, in order to relatively this reference voltage and this comparative voltage, whether is less than or equal to this critical voltage, and exports accordingly this disable signal to detect this first operating voltage.
12. lighting devices as claimed in claim 11, is characterized in that, this filter comprises:
One first resistance, its first end couples this rectification circuit to receive this first operating voltage;
One second resistance, its first end couples the second end of this first resistance, and exports this comparative voltage in its second end;
One first electric capacity, is coupled between second end and a ground connection of this first resistance;
One second electric capacity, is coupled between second end and this ground connection of this second resistance; And
One the 3rd resistance, it is coupled between second end and this ground connection of this first resistance.
13. lighting devices as claimed in claim 11, is characterized in that, this reference voltage generator comprises:
One the 4th resistance, its first end couples this processing unit, and its second end is exported this reference voltage; And
One Zener diode, is coupled between second end and a ground connection of the 4th resistance.
14. lighting devices as claimed in claim 11, is characterized in that, this reference voltage generator comprises:
One the 4th resistance, its first end couples this processing unit, and its second end is exported this reference voltage; And
One the 5th resistance, is coupled between second end and a ground connection of the 4th resistance.
15. lighting devices as claimed in claim 9, is characterized in that, this processing unit is an ASIC(Application Specific Integrated Circuit).
16. lighting devices as claimed in claim 9, is characterized in that, this electrical energy conversion circuit is a reduction voltage circuit, a booster circuit or a flyback (flyback) circuit.
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| CN102665340A (en) * | 2012-05-03 | 2012-09-12 | 济南先锋新型节能灯具有限公司 | Auto-dimming high efficiency solar energy light emitting diode (LED) streetlight power source |
| CN103209506B (en) * | 2013-04-25 | 2015-02-18 | 合肥云杉光电科技有限公司 | Low-voltage bypass electricity taking method for alternating current direct driving light-emitting diode (LED) and integrated circuit |
| CN104254162B (en) * | 2013-06-25 | 2019-04-02 | 华东理工大学 | A kind of LED constant current power supply |
| CN104853467A (en) * | 2014-02-13 | 2015-08-19 | 冠捷投资有限公司 | Light emitting diode driving device |
| CN105611669B (en) * | 2015-12-25 | 2017-12-12 | 浙江宇光照明科技有限公司 | One kind is without stroboscopic, noiseless drive circuit |
| TWI700963B (en) * | 2019-08-28 | 2020-08-01 | 群光電能科技股份有限公司 | Control apparatus for light emitting diode |
| CN116990714B (en) * | 2023-09-26 | 2023-12-08 | 深圳莱福德科技股份有限公司 | Lighting lamp operation data detection circuit and detection device |
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| WO2009053893A1 (en) * | 2007-10-22 | 2009-04-30 | Nxp B.V. | Dimmer jitter correction |
| 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 |
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| CN102065598A (en) | 2011-05-18 |
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