US20140175997A1 - Adaptive light emitting diode dimming driving circuit - Google Patents
Adaptive light emitting diode dimming driving circuit Download PDFInfo
- Publication number
- US20140175997A1 US20140175997A1 US13/783,910 US201313783910A US2014175997A1 US 20140175997 A1 US20140175997 A1 US 20140175997A1 US 201313783910 A US201313783910 A US 201313783910A US 2014175997 A1 US2014175997 A1 US 2014175997A1
- Authority
- US
- United States
- Prior art keywords
- resistor
- led
- voltage
- dimming
- control chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H05B33/0836—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the invention relates to a technical field of light emitting diode (LED) power equipment, and more particularly to an adaptive LED dimming driving circuit supporting TRI-electrode AC switch (TRIAC) that flexibly compensates outputted driving electricity by means of detecting the inputted electricity ripple voltage difference real-time so that the work efficiency of whole circuit can be improved, and the twinkling problem on LEDs can also be prevented.
- LED light emitting diode
- TRIAC TRI-electrode AC switch
- the driving circuit of an LED lamp is to linearly regulate the LED brightness and is accomplished by means of switching an input voltage conduction angle through a TRIAC.
- a constant current architecture is usually adopted and allows an LED to cascade a transistor and a sensing resistor.
- a driving current I LED flowing through the LED is sensed by the sensing resistor so as to form a voltage drop at two ends.
- a high level switching signal or a low level switching signal is outputted to the transistor after utilizing a comparator to compare the voltage drop so that the transistor is conducted or cut off to properly regulate the duty ratio of a pulse width modulation (PWM) signal.
- PWM pulse width modulation
- a conventional linear dimming driving circuit is actually measured to obtain 7.3 watt, 69.1% whole circuit efficiency and 0.908 power factor for the LED.
- the driving circuit architecture is simple and can be obtained with high power factor.
- the figure also shows that although the brightness of the LED has been regulated to the maximum, the power consumption watt of the LED is still increased in accordance with the raising of inputted voltages. Consequently, the energy conversion efficiency will be seriously damaged.
- the LED may be affected by the fabrication process to have different physical properties so as to show different resistances such that the flowing current of each string of LEDs or an across voltage at two ends is not identical.
- the foregoing dimming method may affect the whole circuit efficiency due to different changes of voltages and current, and the problem of inaccurately dimming effect may occur.
- the circuit architecture utilizing the transformer or the inductor to realize the switching of duty ratio of PWM signals has problems of electromagnetic interference (EMI) and twinkling.
- EMI electromagnetic interference
- twinkling problems of twinkling.
- the adaptive LED dimming driving circuit is installed to a lamp board to drive and linearly regulate the illumination brightness of at least an LED and disposed with a dimming module, a rectification module and a control module.
- the rectification module is electrically connected to an external power source through the dimming module.
- the control module is electrically connected to the rectification module and the LED.
- the control module has a control chip, a regulator and a sensing resistor.
- the LED is coupled to the control chip through the regulator and the sensing resistor that are cascaded so that a sensing value is formed and fed back to the control chip after the sensing resistor senses a driving current I LED flowing through the LED.
- the sensing value is compared with a reference value to control the regulator regulating the driving current I LED .
- the feature of the adaptive LED dimming driving circuit is that the rectification module is coupled to the dimming module through a regulator capacitor connected in parallel.
- the control module is disposed with a first resistor, a second resistor, a retainer, a third resistor and a fourth resistor.
- the retainer is electrically connected to the rectification module, the first resistor, the second resistor and the control chip.
- the first resistor is coupled to the second resistor and the control chip.
- the third resistor is electrically connected to the rectification module and the control chip.
- One end of the fourth resistor is coupled to the LED and the control chip while another end of the fourth resistor is coupled to the regulator and the sensing resistor, wherein when the rectification module outputs an input voltage to form an input current I in , the control chip drives the retainer to outputs a retaining current h hold to the second resistor so that the input voltage is consumed by the second resistor to retain a normal work of the dimming module.
- the circuit architecture of the invention does not utilize transformers or inductors to switch PWM signals so that there is no EMI problem, and there is no need to dispose safety components. Therefore, costs can be reduced, and the input voltage energy can be properly detected to regulate the magnitude of TRIAC retaining current so that problems of power consumption and much heat energy can be avoided due to outputted retaining current when the LED is regulated to the maximum brightness such that effects of improving the whole circuit efficiency to retain above 0.9 high power factor, stable illumination quality and improved product service life can be achieved. Moreover, the ripple value of the input voltage is detected by the third resistor. Therefore, when the brightness of the LED is reduced to decrease the input current, the control chip is properly reduced to determine whether or not the reference voltage level of the regulator is driven, thereby preventing the LED from generating twinkling phenomenon.
- FIG. 1 is a measured diagram of a conventional LED power variation without high voltage feedback compensation
- FIG. 2 is a block diagram of a first implementation according to a preferred embodiment of the invention.
- FIG. 3 is a block diagram of a second implementation according to a preferred embodiment of the invention.
- FIG. 5 is a measured diagram of LED power variation of a second implementation according to a preferred embodiment of the invention.
- the rectification module 11 is a bridge full-wave rectifier circuit coupled to the external power source 2 through the dimming module 10 after two ends of the rectification module 11 are connected to a regulator capacitor 110 so that alternating current voltage of the external power source 2 can be rectified to form a direct current input voltage. At this time, a total input voltage value outputted by the rectification module 11 can be changed through the dimming module 10 regulating the phase conduction angle of the alternating current voltage such that a driving voltage outputted to the LED 3 is affected to regulate the emitting brightness.
- the regulator capacitor 110 is an electrolytic capacitor capable of reducing current ripple to prevent electronic components from being damaged by surge voltages instantly generated by TRIAC dimming, thereby forming the effect of circuit protection.
- the control module 12 is electrically connected to the rectification module 11 and the LED 3 and has a retainer 120 , a first resistor 121 , a second resistor 122 , a third resistor 123 , a control chip 124 , a fourth resistor 125 , a regulator 126 and a sensing resistor 127 .
- the control chip 124 has five pins of HV, VDD, GATE, CS and GND and is disposed with a voltage stabilizer 1240 , an operational amplifier 1241 , an over-temperature protector 1242 and a voltage generator 1243 .
- the retainer 120 is a transistor in which its one end is electrically connected to an output end of the bridge full-wave rectification circuit while another end is coupled to the first resistor 121 and the second resistor 122 .
- the GATE is coupled to the control chip 124 .
- Two ends of the first resistor 121 are respectively coupled to the second resistor 122 and the control chip 124 .
- the third resistor 123 is coupled to the output end of the rectification module 11 and the control chip 124 .
- One end of the fourth resistor 125 is electrically connected to the LED 3 and is coupled to a negative input end of the operational amplifier 1241 through CS pins of the control chip 124 while another end is coupled to the sensing resistor 127 .
- the regulator 136 is a transistor in which one end is coupled to the LED 3 while another end is coupled to the sensing resistor 127 .
- the GATE is coupled to the output end of the operational amplifier 1241 through the GATE pins of the control chip 124 , and the regulator 136 can be placed on the surface of the lamp board to improve the heat dissipation efficiency.
- the voltage stabilizer 1240 at high voltage and linearity is coupled to the output end of the rectification module 11 through a limiting resistor 128 .
- a positive input end of the operational amplifier 1241 is coupled to the voltage generator 1243 , and the output end is coupled to the over-temperature protector 1242 to prevent the adaptive LED dimming driving circuit from being damaged by over-temperature.
- the voltage stabilizer 1240 declines voltages to form a stable voltage energy of driving the work of the control chip 134 to drive the retainer 120 outputting a retaining current I hold to the second resistor 122 such that the input voltage can be consumed by the second resistor 122 to retain the normal work of the dimming module 10 .
- the current value of the retaining current I hold can be retained by regulating the resistance of the second resistor 122 and can be widely applicable for different kinds of TRIAC dimming modules 10 having different specifications.
- the limiting resistor 128 limits the voltage energy magnitude outputted by the voltage stabilizer 1240 to achieve protection effect.
- the first resistor 121 detects the input voltage real-time to divide voltages at two ends to form an across voltage such that the across voltage is compared with a comparison value through the control chip 124 to drive the retainer 120 regulating the magnitude of the retaining current.
- the sensing resistor 127 senses a driving current I LED flowing through the LED 3 , a sensing value is formed and fed back to the control chip 124 so that the sensing value is compared with a reference value through the control chip 124 to control the regulator 126 regulating the driving current I LED .
- the input voltage is raised to increase the driving voltage taken by the LED 3 , the across voltage at two ends of the regulator 126 is increased.
- the across voltage at two ends of the fourth resistor 125 is also increased to compensate the across voltage at two ends of the sensing resistor 127 .
- the input voltage when the input voltage is decreased, across voltage at two ends of the fourth resistor 125 and the sensing resistor 127 is accordingly reduced to allow the control chip 124 to drive the regulator 126 so as to increase the driving current I LED so that when the driving voltage is changed due to different physical properties of each LED, high-low voltage compensation is properly performed. Therefore, an actual measured result as shown in FIG. 5 , the input current shows a similarly sinusoidal waveform. Further, when the input voltage is 120V, the LED power is 6 W, the adaptive LED dimming driving circuit efficiency is 66.9%, and PF is 0.926. Although the input voltage is increased, the power consumption of the LED is still retained at a range without increasing, thereby achieving constant power state.
- the third resistor 123 divides voltages and detects the ripple value of the input voltage.
- the control chip 124 can utilize additional amplifiers to reduce the reference value.
- the control chip 124 can be prevented from continuously regulating the regulator 126 to eliminate problems of twinkling phenomenon occurring on the LED 3 or abnormal works.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
- This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 101149726 filed in Taiwan, R.O.C. on Dec. 25, 2012, the entire contents of which are hereby incorporated by reference.
- 1. Field of the Invention
- The invention relates to a technical field of light emitting diode (LED) power equipment, and more particularly to an adaptive LED dimming driving circuit supporting TRI-electrode AC switch (TRIAC) that flexibly compensates outputted driving electricity by means of detecting the inputted electricity ripple voltage difference real-time so that the work efficiency of whole circuit can be improved, and the twinkling problem on LEDs can also be prevented.
- 2. Description of the Related Art
- Currently, the driving circuit of an LED lamp is to linearly regulate the LED brightness and is accomplished by means of switching an input voltage conduction angle through a TRIAC. To retain the stable power for improving the illumination quality, a constant current architecture is usually adopted and allows an LED to cascade a transistor and a sensing resistor. A driving current ILED flowing through the LED is sensed by the sensing resistor so as to form a voltage drop at two ends. Afterward a high level switching signal or a low level switching signal is outputted to the transistor after utilizing a comparator to compare the voltage drop so that the transistor is conducted or cut off to properly regulate the duty ratio of a pulse width modulation (PWM) signal. Accordingly, the magnitude of the outputted driving voltage can be controlled by conducting cycle length through the PWM signal, thereby affecting the magnitude of driving current ILED and light emitting brightness of the LED.
- As shown in
FIG. 1 , while inputtingvoltage 120V, a conventional linear dimming driving circuit is actually measured to obtain 7.3 watt, 69.1% whole circuit efficiency and 0.908 power factor for the LED. It should be noted that the driving circuit architecture is simple and can be obtained with high power factor. However, the figure also shows that although the brightness of the LED has been regulated to the maximum, the power consumption watt of the LED is still increased in accordance with the raising of inputted voltages. Consequently, the energy conversion efficiency will be seriously damaged. On the other hand, the LED may be affected by the fabrication process to have different physical properties so as to show different resistances such that the flowing current of each string of LEDs or an across voltage at two ends is not identical. Accordingly, the foregoing dimming method may affect the whole circuit efficiency due to different changes of voltages and current, and the problem of inaccurately dimming effect may occur. Moreover, the circuit architecture utilizing the transformer or the inductor to realize the switching of duty ratio of PWM signals has problems of electromagnetic interference (EMI) and twinkling. At this time, if safety components are increased, the work efficiency of the whole circuit is reduced to cause non-practicality. Additional circuits are increased to supply TRIAC reference working current. It may still work due to retaining current to form high idle work consumption since the LED is regulated to reach the maximum light emitting brightness. - Accordingly, improving the conventional dimming circuit architecture to properly regulate TRIAC retaining current through a simple detection circuit and effectively reducing idle work consumption while allowing the driving current ILED to retain at constant state are an important issue. Moreover, responding with LED's physical property, the high voltage compensation of inputted voltage is realized by utilizing a simple circuit architecture so that the whole circuit quality can be actually increased, and the light emitting power of the LED can be effectively improved. The foregoing situation will be also further discussed.
- Therefore, upon the foregoing defects in prior arts, it is a primary objective of the present invention to provide an adaptive LED dimming driving circuit to control the magnitude of outputted driving voltage energy by means of linear regulation, thus preventing the LED from twinkling and retaining TRIAC dimming feature.
- According to an objective of the invention, the adaptive LED dimming driving circuit is installed to a lamp board to drive and linearly regulate the illumination brightness of at least an LED and disposed with a dimming module, a rectification module and a control module. The rectification module is electrically connected to an external power source through the dimming module. The control module is electrically connected to the rectification module and the LED. The control module has a control chip, a regulator and a sensing resistor. The LED is coupled to the control chip through the regulator and the sensing resistor that are cascaded so that a sensing value is formed and fed back to the control chip after the sensing resistor senses a driving current ILED flowing through the LED. The sensing value is compared with a reference value to control the regulator regulating the driving current ILED. The feature of the adaptive LED dimming driving circuit is that the rectification module is coupled to the dimming module through a regulator capacitor connected in parallel. The control module is disposed with a first resistor, a second resistor, a retainer, a third resistor and a fourth resistor. The retainer is electrically connected to the rectification module, the first resistor, the second resistor and the control chip. The first resistor is coupled to the second resistor and the control chip. The third resistor is electrically connected to the rectification module and the control chip. One end of the fourth resistor is coupled to the LED and the control chip while another end of the fourth resistor is coupled to the regulator and the sensing resistor, wherein when the rectification module outputs an input voltage to form an input current Iin, the control chip drives the retainer to outputs a retaining current hhold to the second resistor so that the input voltage is consumed by the second resistor to retain a normal work of the dimming module. The first resistor divides the input voltage to allow the control chip to detect a dimming intensity of the dimming module real-time such that under a condition of allowing the input current satisfying a correlation Iin=Ihold+ILED, the retaining current has a minimum current value to increase a work efficiency when the LED is regulated to a maximum brightness; wherein when the input voltage raises, an across voltage at two ends of the fourth resistor is increased to compensate an across voltage at two ends of the sensing resistor so that the driving current ILED is reduced to achieve a constant power state, and the third resistor divides voltages and detects a ripple value of the input voltage. When the input voltage is reduced and the ripple value is smaller than a standard value, the control chip reduces the reference value to prevent the LED from generating twinkling phenomenon.
- The circuit architecture of the invention does not utilize transformers or inductors to switch PWM signals so that there is no EMI problem, and there is no need to dispose safety components. Therefore, costs can be reduced, and the input voltage energy can be properly detected to regulate the magnitude of TRIAC retaining current so that problems of power consumption and much heat energy can be avoided due to outputted retaining current when the LED is regulated to the maximum brightness such that effects of improving the whole circuit efficiency to retain above 0.9 high power factor, stable illumination quality and improved product service life can be achieved. Moreover, the ripple value of the input voltage is detected by the third resistor. Therefore, when the brightness of the LED is reduced to decrease the input current, the control chip is properly reduced to determine whether or not the reference voltage level of the regulator is driven, thereby preventing the LED from generating twinkling phenomenon.
- The detailed structure, operating principle and effects of the present invention will now be described in more details hereinafter with reference to the accompanying drawings that show various embodiments of the invention as follows.
-
FIG. 1 is a measured diagram of a conventional LED power variation without high voltage feedback compensation; -
FIG. 2 is a block diagram of a first implementation according to a preferred embodiment of the invention; -
FIG. 3 is a block diagram of a second implementation according to a preferred embodiment of the invention; -
FIG. 4 is a circuit diagram of a second implementation according to a preferred embodiment of the invention; -
FIG. 5 is a measured diagram of LED power variation of a second implementation according to a preferred embodiment of the invention; - The technical content of the present invention will become apparent by the detailed description of the following embodiments and the illustration of related drawings as follows.
- With reference to
FIG. 2 toFIG. 4 for a block diagram of an implementation and a block diagram and a circuit diagram of a second implementation according to a preferred embodiment of the invention are depicted. As shown in the figures, the adaptive LEDdimming driving circuit 1 is normally disposed to a lamp board of a lamp to convert voltage energy of anexternal power source 2 so as to drive and linearly regulate the illumination brightness of at least anLED 3. The adaptive LEDdimming driving circuit 1 is disposed with adimming module 10, arectification module 11 and acontrol module 12. Thedimming module 10 is a TRIAC linear dimming circuit. Therectification module 11 is a bridge full-wave rectifier circuit coupled to theexternal power source 2 through thedimming module 10 after two ends of therectification module 11 are connected to aregulator capacitor 110 so that alternating current voltage of theexternal power source 2 can be rectified to form a direct current input voltage. At this time, a total input voltage value outputted by therectification module 11 can be changed through thedimming module 10 regulating the phase conduction angle of the alternating current voltage such that a driving voltage outputted to theLED 3 is affected to regulate the emitting brightness. Theregulator capacitor 110 is an electrolytic capacitor capable of reducing current ripple to prevent electronic components from being damaged by surge voltages instantly generated by TRIAC dimming, thereby forming the effect of circuit protection. - The
control module 12 is electrically connected to therectification module 11 and theLED 3 and has aretainer 120, afirst resistor 121, asecond resistor 122, athird resistor 123, acontrol chip 124, afourth resistor 125, aregulator 126 and asensing resistor 127. Thecontrol chip 124 has five pins of HV, VDD, GATE, CS and GND and is disposed with avoltage stabilizer 1240, anoperational amplifier 1241, anover-temperature protector 1242 and avoltage generator 1243. Theretainer 120 is a transistor in which its one end is electrically connected to an output end of the bridge full-wave rectification circuit while another end is coupled to thefirst resistor 121 and thesecond resistor 122. The GATE is coupled to thecontrol chip 124. Two ends of thefirst resistor 121 are respectively coupled to thesecond resistor 122 and thecontrol chip 124. Thethird resistor 123 is coupled to the output end of therectification module 11 and thecontrol chip 124. One end of thefourth resistor 125 is electrically connected to theLED 3 and is coupled to a negative input end of theoperational amplifier 1241 through CS pins of thecontrol chip 124 while another end is coupled to thesensing resistor 127. The regulator 136 is a transistor in which one end is coupled to theLED 3 while another end is coupled to thesensing resistor 127. The GATE is coupled to the output end of theoperational amplifier 1241 through the GATE pins of thecontrol chip 124, and the regulator 136 can be placed on the surface of the lamp board to improve the heat dissipation efficiency. - The
voltage stabilizer 1240 at high voltage and linearity is coupled to the output end of therectification module 11 through a limitingresistor 128. A positive input end of theoperational amplifier 1241 is coupled to thevoltage generator 1243, and the output end is coupled to theover-temperature protector 1242 to prevent the adaptive LED dimming driving circuit from being damaged by over-temperature. When therectification module 11 outputs the input voltage to form an input current Iin, thevoltage stabilizer 1240 declines voltages to form a stable voltage energy of driving the work of the control chip 134 to drive theretainer 120 outputting a retaining current Ihold to thesecond resistor 122 such that the input voltage can be consumed by thesecond resistor 122 to retain the normal work of the dimmingmodule 10. Accordingly, the current value of the retaining current Ihold can be retained by regulating the resistance of thesecond resistor 122 and can be widely applicable for different kinds ofTRIAC dimming modules 10 having different specifications. The limitingresistor 128 limits the voltage energy magnitude outputted by thevoltage stabilizer 1240 to achieve protection effect. At the same time, thefirst resistor 121 detects the input voltage real-time to divide voltages at two ends to form an across voltage such that the across voltage is compared with a comparison value through thecontrol chip 124 to drive theretainer 120 regulating the magnitude of the retaining current. Further, the input current satisfies a correlation Iin=Ihold+ILED to allow thecontrol chip 124 to regulate theretainer 120 by corresponding to the variation of the input current so that when theLED 3 is regulated to reach the maximum brightness, the retaining current has the minimum current value to increase the work efficiency. - After the
sensing resistor 127 senses a driving current ILED flowing through theLED 3, a sensing value is formed and fed back to thecontrol chip 124 so that the sensing value is compared with a reference value through thecontrol chip 124 to control theregulator 126 regulating the driving current ILED. When the input voltage is raised to increase the driving voltage taken by theLED 3, the across voltage at two ends of theregulator 126 is increased. Similarly, the across voltage at two ends of thefourth resistor 125 is also increased to compensate the across voltage at two ends of thesensing resistor 127. However, if thevoltage generator 1243 provides constant 0.5V to theoperational amplifier 1241, voltage drops at two ends of thefourth resistor 125 and thesensing resistor 127 must be fixed at 0.5V. Accordingly, with the compensation efficacy formed by thefourth resistor 125, current flowing through thesensing resistor 127 will be reduced to effectively decrease the driving current ILED. While steadying the light emitting efficiency, simultaneously the LED can be prevented from being damaged due to over-voltage. On the contrary, when the input voltage is decreased, across voltage at two ends of thefourth resistor 125 and thesensing resistor 127 is accordingly reduced to allow thecontrol chip 124 to drive theregulator 126 so as to increase the driving current ILED so that when the driving voltage is changed due to different physical properties of each LED, high-low voltage compensation is properly performed. Therefore, an actual measured result as shown inFIG. 5 , the input current shows a similarly sinusoidal waveform. Further, when the input voltage is 120V, the LED power is 6 W, the adaptive LED dimming driving circuit efficiency is 66.9%, and PF is 0.926. Although the input voltage is increased, the power consumption of the LED is still retained at a range without increasing, thereby achieving constant power state. - It should be noted the
third resistor 123 divides voltages and detects the ripple value of the input voltage. When the input voltage is decreased to allow the ripple value to be smaller than a standard value, for example, the input voltage is lower than 40V to allow the ripple value to be smaller than 0.5V, thecontrol chip 124 can utilize additional amplifiers to reduce the reference value. Thecontrol chip 124 can be prevented from continuously regulating theregulator 126 to eliminate problems of twinkling phenomenon occurring on theLED 3 or abnormal works. - In the embodiment, the
LED 3 is connected to a drivingcapacitor 129 having greater capacitance in parallel to charge or discharge the driving current ILED to enhance the anti-noise capability of circuits, thereby forming efficacies of voltage stabilization and protecting the LED.
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW101149726A | 2012-12-25 | ||
TW101149726 | 2012-12-25 | ||
TW101149726A TWI462640B (en) | 2012-12-25 | 2012-12-25 | Adaptive LED dimming drive circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
US20140175997A1 true US20140175997A1 (en) | 2014-06-26 |
US8766560B1 US8766560B1 (en) | 2014-07-01 |
Family
ID=50556132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/783,910 Expired - Fee Related US8766560B1 (en) | 2012-12-25 | 2013-03-04 | Adaptive light emitting diode dimming driving circuit |
Country Status (5)
Country | Link |
---|---|
US (1) | US8766560B1 (en) |
JP (1) | JP3191691U (en) |
CN (1) | CN103906298B (en) |
DE (1) | DE102013101243B3 (en) |
TW (1) | TWI462640B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107654857A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | One kind integrates filament lamp |
EP3288340A1 (en) * | 2016-08-23 | 2018-02-28 | Unity Opto Technology Co., Ltd. | Micro dimming module |
CN110120197A (en) * | 2019-04-11 | 2019-08-13 | 深圳天源中芯半导体有限公司 | A kind of application of the manystage cascade connection system and its implementation omitted peripheral resistance capacitance and reduce interference |
US20200221555A1 (en) * | 2018-12-12 | 2020-07-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for segmented constant current control |
CN112839406A (en) * | 2019-11-07 | 2021-05-25 | 华润微集成电路(无锡)有限公司 | Linear LED driving system and driving method |
CN113179565A (en) * | 2021-05-06 | 2021-07-27 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier depth compensation circuit and LED lighting device of adjusting luminance |
US11582849B2 (en) * | 2019-02-20 | 2023-02-14 | Signify Holding B.V. | LED driver for LED lighting units for replacing a high-intensity discharge lamp |
KR20230000931U (en) * | 2021-10-29 | 2023-05-09 | 센젠 베이스어스 테크놀로지 컴퍼니 리미티드 | Alternating current transmission circuit and socket |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107105535A (en) * | 2016-02-19 | 2017-08-29 | 上海俪德照明科技股份有限公司 | A kind of control system and its G9 LED bulbs for adjusting brightness |
CN107690213B (en) * | 2017-10-17 | 2024-05-24 | 无锡恒芯微科技有限公司 | Non-isolated low-voltage non-flicker LED driving circuit |
CN113365393B (en) * | 2020-03-04 | 2022-11-15 | 宏碁股份有限公司 | Light emitting device driving circuit |
CN112492718B (en) * | 2020-12-02 | 2023-05-16 | 上海裕芯电子科技有限公司 | Low-voltage over-temperature and down-flow LED driving circuit |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2763203B1 (en) * | 1997-05-09 | 1999-06-04 | Schneider Electric Sa | ELECTRICAL CIRCUIT FOR SUPPLYING A LIGHT EMITTING DIODE |
CA2536307C (en) * | 2004-05-19 | 2015-07-07 | Goeken Group Corp. | Dynamic snubbing for led lighting converter |
JP3904579B2 (en) * | 2004-12-03 | 2007-04-11 | ローム株式会社 | Power supply device, light emitting device using the same, and electronic device |
KR100943656B1 (en) * | 2009-05-11 | 2010-03-03 | (주)로그인디지탈 | Light emitting diode driving circuit |
CN102577607B (en) * | 2009-10-14 | 2015-11-25 | 赤多尼英国有限公司 | The method of the brightness of control LED |
JP5031865B2 (en) * | 2010-03-23 | 2012-09-26 | シャープ株式会社 | LED drive circuit, LED illumination lamp, LED illumination device, and LED illumination system |
KR20120056162A (en) * | 2010-11-24 | 2012-06-01 | 삼성엘이디 주식회사 | Led driving apparatus |
JP5968904B2 (en) * | 2010-12-21 | 2016-08-10 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | Device and method for controlling current to a solid state lighting circuit |
TWI461107B (en) * | 2011-03-22 | 2014-11-11 | Richtek Technology Corp | Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof |
US8497637B2 (en) * | 2011-04-13 | 2013-07-30 | Gang Gary Liu | Constant voltage dimmable LED driver |
CN102791054B (en) * | 2011-04-22 | 2016-05-25 | 昂宝电子(上海)有限公司 | For the system and method for the brightness adjustment control under capacity load |
CN202353846U (en) * | 2011-06-22 | 2012-07-25 | 罗姆股份有限公司 | Power supply for illumination of light-emitting diode (LED) |
TWM440613U (en) * | 2012-04-24 | 2012-11-01 | Midas Wei Trading Co Ltd | Light adjusting circuit |
-
2012
- 2012-12-25 TW TW101149726A patent/TWI462640B/en not_active IP Right Cessation
- 2012-12-28 CN CN201210585237.1A patent/CN103906298B/en not_active Expired - Fee Related
-
2013
- 2013-02-07 DE DE102013101243.4A patent/DE102013101243B3/en not_active Expired - Fee Related
- 2013-03-04 US US13/783,910 patent/US8766560B1/en not_active Expired - Fee Related
-
2014
- 2014-04-24 JP JP2014002154U patent/JP3191691U/en not_active Expired - Fee Related
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107654857A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | One kind integrates filament lamp |
EP3288340A1 (en) * | 2016-08-23 | 2018-02-28 | Unity Opto Technology Co., Ltd. | Micro dimming module |
US20200221555A1 (en) * | 2018-12-12 | 2020-07-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for segmented constant current control |
US10980093B2 (en) * | 2018-12-12 | 2021-04-13 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for segmented constant current control |
US20210185782A1 (en) * | 2018-12-12 | 2021-06-17 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for segmented constant current control |
US11564297B2 (en) * | 2018-12-12 | 2023-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for segmented constant current control |
US11582849B2 (en) * | 2019-02-20 | 2023-02-14 | Signify Holding B.V. | LED driver for LED lighting units for replacing a high-intensity discharge lamp |
CN110120197A (en) * | 2019-04-11 | 2019-08-13 | 深圳天源中芯半导体有限公司 | A kind of application of the manystage cascade connection system and its implementation omitted peripheral resistance capacitance and reduce interference |
CN112839406A (en) * | 2019-11-07 | 2021-05-25 | 华润微集成电路(无锡)有限公司 | Linear LED driving system and driving method |
CN113179565A (en) * | 2021-05-06 | 2021-07-27 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier depth compensation circuit and LED lighting device of adjusting luminance |
KR20230000931U (en) * | 2021-10-29 | 2023-05-09 | 센젠 베이스어스 테크놀로지 컴퍼니 리미티드 | Alternating current transmission circuit and socket |
KR200498026Y1 (en) * | 2021-10-29 | 2024-05-23 | 센젠 베이스어스 테크놀로지 컴퍼니 리미티드 | Alternating current transmission circuit and socket |
Also Published As
Publication number | Publication date |
---|---|
JP3191691U (en) | 2014-07-03 |
TW201427479A (en) | 2014-07-01 |
CN103906298B (en) | 2015-12-02 |
TWI462640B (en) | 2014-11-21 |
US8766560B1 (en) | 2014-07-01 |
CN103906298A (en) | 2014-07-02 |
DE102013101243B3 (en) | 2014-05-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8766560B1 (en) | Adaptive light emitting diode dimming driving circuit | |
US8941328B2 (en) | Variable power dimming control circuit | |
US9775206B2 (en) | LED AC drive circuit | |
US9072149B2 (en) | LED driving device with open circuit protection and color temperature and brightness adjustment | |
US9198243B2 (en) | LED driver circuit for supplying TRIAC holding current by using controllable current source | |
US8829819B1 (en) | Enhanced active preload for high performance LED driver with extended dimming | |
US7550934B1 (en) | LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response | |
US7626342B2 (en) | High efficiency power controller for solid state lighting | |
JP4975083B2 (en) | Light source lighting device and lighting device | |
US20140035474A1 (en) | High efficiency led driver chip and driver circuit thereof | |
TW201422045A (en) | High stability LED control circuit | |
TWI586207B (en) | Driving circuit for driving led load | |
JP2016501436A (en) | LED driver circuit using flyback converter to reduce observable optical flicker by reducing rectified AC power supply ripple | |
US9485824B2 (en) | Purely resistive dimming circuit | |
US11596037B2 (en) | Voltage ripple detection and driver control for stable output current | |
US20160087535A1 (en) | Self-excited power conversion circuit for secondary side control output power | |
US9089023B2 (en) | Driving circuit of light emitting element, and light emitting device and electronic apparatus including the light emitting element | |
KR101208347B1 (en) | Apparatus for Driving Illumination of Light Emitting Diode | |
KR20140104196A (en) | Power supply circuit for light emitting diode lighting | |
KR20140057925A (en) | Led driving circuit for optical-volume controlling according to shifting of source voltage | |
US9967929B1 (en) | High performance linear LED driving circuit | |
TWM496905U (en) | LED driving circuit with improved performance and utilization rate | |
US11528790B2 (en) | System and method for repurposing 120VAC wiring architecture to retrofitable low voltage DC power 2-wire LED dimming | |
KR20140053650A (en) | Apparatus for lighting using light emitting diode | |
JP7429144B2 (en) | LED lighting devices and lighting equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: UNITY OPTO TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WU, CHIH-HSIEN;CHANG, WEI;LU, HUAN-YING;AND OTHERS;REEL/FRAME:029920/0316 Effective date: 20130301 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551) Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20220701 |