CN102665324A - LED linear driving circuit applicable to thyristor dimmer and control method - Google Patents

LED linear driving circuit applicable to thyristor dimmer and control method Download PDF

Info

Publication number
CN102665324A
CN102665324A CN2012101061234A CN201210106123A CN102665324A CN 102665324 A CN102665324 A CN 102665324A CN 2012101061234 A CN2012101061234 A CN 2012101061234A CN 201210106123 A CN201210106123 A CN 201210106123A CN 102665324 A CN102665324 A CN 102665324A
Authority
CN
China
Prior art keywords
led
circuit
linear driving
absorption
driving circuit
Prior art date
Application number
CN2012101061234A
Other languages
Chinese (zh)
Inventor
胡黎强
于得水
Original Assignee
上海晶丰明源半导体有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 上海晶丰明源半导体有限公司 filed Critical 上海晶丰明源半导体有限公司
Priority to CN2012101061234A priority Critical patent/CN102665324A/en
Publication of CN102665324A publication Critical patent/CN102665324A/en

Links

Abstract

The invention discloses an LED linear driving circuit applicable to a thyristor dimmer and a control method. The thyristor dimmer is connected with an input end of the LED linear driving circuit through a rectifier bridge. The LED linear driving circuit is characterized by comprising an LED light string, an LED driver, a voltage sampling network, an absorption control circuit and a current absorption circuit, the LED light string is formed by serially connecting at least one LED, the LED driver comprises N LED driving circuits, each LED driving circuit is connected with cathodes of a group of LED loads so as to control on or off of single or all LED groups, the voltage sampling network is used for detecting output voltage of the rectifier bridge and outputting a signal, the absorption control circuit is used for controlling the current absorption circuit according to the output signal of the voltage sampling network, and the current absorption circuit is used for providing the thyristor dimmer with stable holding current.

Description

Be applicable to the LED Linear Driving circuit and the control method of controllable silicon dimmer

Technical field

The present invention relates to a kind of linear led drive circuit, relate in particular to a kind of LED illumination driving circuit and control method that is applicable to silicon controlled dimmer for light control.

Background technology

Fig. 1 is traditional linear constant-current control circuit of LED.LED lamp string 101 is connected to the anode of input rectifying bridge 100 among the figure, through one be connected to input rectifying bridge 100 ground ends led drive circuit 102 set the electric current that flows through LED.LED lamp string 101 can exchange with the position of linear constant-current source 102 each other.

Because LED lamp string 101 is in series by a lot of LED, only when input voltage is higher than LED lamp string 101 forward conduction voltages, LED lamp string 101 is just understood and lighted.In the system of electric main power supply, LED lamp string 101 only just can be lighted near input voltage reaches peak value, so the utilance of LED is very low, power factor is not high yet.If reduce the LED lamp quantity of series connection, though can increase the utilance of LED, the power consumption of led drive circuit 102 is increased greatly, thereby reduce the efficient of whole drive circuit, increase the temperature rise of drive circuit.If the electric current when increase LED lamp string 101 is lighted though can improve the brightness of LED, then need adopt more high-power LED, thereby increase the cost of system, system power dissipation also can increase along with the increase of LED drive current.

Common controllable silicon dimmer is cut or back cut before electric main is carried out, and changes the output voltage effective value and realizes dimming function, and controllable silicon dimmer needs certain keep electric current and could keep stablizing conducting.In conventional incandescent is used, because incandescent lamp is a resistive load, so when cut angle arbitrarily, controllable silicon dimmer can flow through certain electric current.And when controllable silicon dimmer was applied in the led drive circuit, because the LED load is non-linear, load current can all not exist in cut angle arbitrarily, so dimmer often works in abnormal condition, made lamp flicker even can't operate as normal occur.

Summary of the invention

For solving the problems referred to above that prior art exists; The present invention proposes a kind of linear led drive circuit and control method that is applicable to controllable silicon dimmer; Can light part or all of LED through the size of LED electric current according to actual flow on the one hand; Improve the utilance of LED, the luminous efficiency of lamp and power factor; Also designed the current absorption circuit on the other hand, made controllable silicon dimmer reach the effect of stablizing light modulation at any cut angle steady operation.

In order to realize the foregoing invention purpose; The present invention discloses a kind of LED Linear Driving circuit that is applicable to controllable silicon dimmer; This controllable silicon dimmer is connected with the input of this LED Linear Driving circuit through a rectifier bridge; It is characterized in that this LED Linear Driving circuit comprises: a LED lamp string, this LED lamp string is in series by at least one LED; One led driver, said led driver is made up of N led drive circuit, and each led drive circuit connects the negative electrode of one group of LED load, to control single or whole LED group work or to close; One voltage sample network is used to detect the output voltage of this rectifier bridge and exports a signal; One absorbs control circuit, according to the output signal controlling current absorption circuit of this voltage sample network; One current absorption circuit, this current absorption circuit are used to provide this controllable silicon dimmer one stable maintenance electric current.

Further, an input of this rectifier bridge is connected with AC-input voltage, and another input is connected with this controllable silicon dimmer, and this rectifier bridge output plus terminal is connected with the input of this led drive circuit, this rectifier bridge output negativing ending grounding.

Further, this led drive circuit comprises: at least one current sampling resistor, and said current sampling resistor one end ground connection, the other end is connected with an operational amplifier and a multidiameter option switch; One operational amplifier compares the voltage on the current sampling resistor of said each LED respectively with a reference voltage; Output is connected with said multidiameter option switch; One multidiameter option switch, said multidiameter option switch connects said LED respectively, and said multidiameter option switch changes its conduction impedance according to said comparative result, with control section or all LED conductings.

Further, this reference voltage is an equal values, perhaps is different value.

Further; This voltage sample network comprises resistance or the resistance and the electric capacity combination of serial connection up and down; Should go up divider resistance or resistance is connected with this rectifier bridge output cathode with the electric capacity combination; Should go up divider resistance or resistance and be connected the other end ground connection of this time divider resistance or resistance and electric capacity combination with an end of electric capacity combination and the input of this absorption control circuit with following divider resistance or resistance with the other end of electric capacity combination.

Further; This absorption control circuit comprises a comparator or operational amplifier; The in-phase input end of this comparator or operational amplifier is connected with a benchmark voltage; The reverse input end of this comparator or operational amplifier connects this input that absorbs control circuit, and the output of this comparator or operational amplifier connects this output that absorbs control circuit.

Further; This current absorption circuit comprises that a control switch and absorbs network; This absorption network is resistance or resistance and electric capacity combination, and this absorbs network one end and connects this rectifier bridge output cathode, and this absorbs the network other end and connects this control switch input; This control switch output connecting circuit ground, this control switch control end connect this output that absorbs control circuit.

Further, this each led drive circuit and other led drive circuit alternations are perhaps worked simultaneously.

The present invention discloses a kind of LED Linear Driving circuit control method that is applicable to controllable silicon dimmer simultaneously; It is characterized in that; Comprise: a controllable silicon dimmer is connected with the input of a LED Linear Driving circuit through a rectifier bridge; The output voltage of this rectifier bridge of voltage sample network measuring of the LED Linear Driving circuit that is somebody's turn to do is also exported a signal; The absorption control circuit of the LED Linear Driving circuit that is somebody's turn to do is according to this output signal controlling one current absorption circuit; This current absorption circuit provides a stable maintenance electric current to make this controllable silicon dimmer conducting according to the control of this absorption control circuit, and the led drive circuit of this LED Linear Driving circuit is alternately perhaps worked according to this each led drive circuit of the positive terminal voltage decision of this rectifier bridge simultaneously, and the drive current of a LED lamp string is provided.

Compared with prior art, the present invention uses N led drive circuit, according to the size of input voltage instantaneous value, makes the LED load divide into groups to be lighted, thereby improves the utilance and total output lumen number of LED.The present invention has improved the efficient of drive circuit, has increased the power factor of input power supply, has reduced the cost of system.And can regulate LED brightness through changing controllable silicon dimmer cut angular dimension.

Description of drawings

Fig. 1 is traditional linear constant-current control circuit sketch map of LED;

Fig. 2 is the sketch map according to the linear led drive circuit of the compatible silicon controlled dimmer that goes out shown in the present;

Fig. 3 is a kind of implementation method according to the led drive circuit that goes out shown in the present;

Fig. 4 is a kind of implementation method according to the voltage sample network that goes out shown in the present;

Fig. 5 is a kind of implementation method according to the absorption control circuit that goes out shown in the present;

Fig. 6 is a kind of implementation method according to the current absorption circuit that goes out shown in the present.

Embodiment

Specify specific embodiment of the present invention below in conjunction with accompanying drawing.

Traditional LED linear constant current circuit, LED lamp string only just can be lighted near input voltage reaches peak value.

The present invention provides a kind of LED linear current drive circuit; When input voltage is low, just can lights partial L ED, thereby improve the utilance of LED; Open according to the rectifier bridge output voltage signal simultaneously or cut-off current absorption circuit, reach the purpose of compatible silicon controlled dimmer.The present invention is characterised in that, comprising: a LED lamp load, and this LED lamp load is in series by N group LED; One led driver, this led driver is made up of N led drive circuit, to control single or whole LED group work or to close; One voltage sample network is used to detect the rectifier bridge output voltage; One absorbs control circuit, is used for Control current and absorbs circuit; One current absorption circuit is used to provide the electric current of keeping that makes the controllable silicon dimmer steady operation.The present invention can improve LED lamp useful life, improves LED lamp power factor value, improves the LED lamp efficiency, and it is long-pending to dwindle the LED lamp body, compatible silicon controlled dimmer.

Below will combine Fig. 2 to Fig. 6 to specify the present invention.

Fig. 2 is the enforcement circuit of the linear led drive circuit of the compatible silicon controlled dimmer that goes out shown in the present, comprises controllable silicon dimmer 201, rectifier bridge 202, current absorption circuit 203, voltage sample network 204, absorbs control circuit 205, led driver 206, LED load 207.Wherein comprise led drive circuit 1, led drive circuit 2 in the led driver 206 ... Led drive circuit n.Comprise lamp pearl string LED1, LED2 in the LED load 207 ... LEDn.LED1, LED2, LEDn are one or several LED series connection or are formed in parallel.

In the system by the electric main power supply, input voltage is an AC sine wave.After the rectifier bridge rectification, the rectifier bridge output voltage is the absolute value of input ac voltage.Lower at the input voltage instantaneous value, and can not make the lamp pearl string LED1 conducting in the LED load 207 time, LED loads all among the present invention all are in closed condition.Along with the input voltage instantaneous value rises gradually, lamp pearl string LED1 flows through electric current earlier, and led drive circuit 1 is started working.When the input voltage instantaneous value further rises to can make lamp pearl string LED1 with the conducting simultaneously of lamp pearl string LED2 string the time, lamp pearl string LED2 begins to flow through electric current, and led drive circuit 2 is started working, simultaneously led drive circuit 1 entering closed condition.By that analogy, when input voltage reaches can make whole LED loads conducting simultaneously the time, led drive circuit N gets into operating state, and the while, other led drive circuits all got into closed condition.

When the input voltage instantaneous value begins to drop to can not make whole LED loads conducting simultaneously the time; Led drive circuit N gets into closed condition; Simultaneously led drive circuit N-1 gets into conducting state, by that analogy, and when input voltage drops to can not make lamp pearl string LED1 conducting the time; All LED loads all get into closed condition, accomplish the duty cycle of one-period with this.

Current absorption circuit 203, voltage sample network 204 and absorption control circuit 205 can provide the electric current of keeping that makes the controllable silicon dimmer steady operation.Concrete grammar is following: voltage sample network 204 detects the output voltage of rectifier bridge, and when the output signal of voltage sample network 204 was higher than the benchmark voltage that absorbs in the control circuit 205, current absorption circuit 203 was closed.When the output signal of voltage sample network 204 was lower than the benchmark voltage that absorbs in the control circuit 205, current absorption circuit 203 was open-minded.

Fig. 3 is an embodiment of the led drive circuit in the led driver 206, comprises operational amplifier 301, multidiameter option switch 302, current sampling resistor 303.

The input current of led drive circuit flows through current sampling resistor 303; Operational amplifier 301 is compared the voltage on the current sampling resistor 303 with current reference voltage; The control end of the error signal drives multidiameter option switch 302 that produces; The input of multidiameter option switch 302 and the impedance between output are controlled the control of terminal voltage, thereby realize the closed-loop adjustment of led drive circuit electric current.

Fig. 4 is an embodiment of voltage sample network 204, comprises divider resistance 401, following dividing potential drop electric capacity 402, following divider resistance 403.

Last divider resistance 401 connects the output of rectifier bridge, and last divider resistance 401 and following dividing potential drop electric capacity 402, following divider resistance 403 are formed voltage sample networks 204.The output of voltage sample network 204 connects the input that absorbs control circuit 205.

Fig. 5 is an embodiment who absorbs control circuit 205, comprises comparator 501.

Comparator 501 is compared the output signal of voltage sample network 204 with benchmark voltage, when the output signal of voltage sample network 204 during greater than benchmark voltage, close current absorbs circuit 203; When the output signal of voltage sample network 204 during, open current absorption circuit 203 less than benchmark voltage.Comparator 501 should be designed with certain return difference.

Fig. 6 is an embodiment of current absorption circuit, comprises absorption resistance 601, control switch 602.

Control switch 602 opens or cuts out according to the output signal of comparator 501, and absorption resistance 601 has determined the size of absorption current.

Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (9)

1. LED Linear Driving circuit that is applicable to controllable silicon dimmer, said controllable silicon dimmer is connected with the input of said LED Linear Driving circuit through a rectifier bridge, it is characterized in that said LED Linear Driving circuit comprises:
One LED lamp string, said LED lamp string is in series by at least one LED;
One led driver, said led driver is made up of N led drive circuit, and each led drive circuit connects the negative electrode of one group of LED load, to control single or whole LED group work or to close;
One voltage sample network is used to detect the output voltage of said rectifier bridge and exports a signal;
One absorbs control circuit, according to the output signal controlling current absorption circuit of said voltage sample network;
One current absorption circuit, said current absorption circuit are used to provide said controllable silicon dimmer one stable maintenance electric current.
2. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; An input of said rectifier bridge is connected with AC-input voltage; Another input is connected with said controllable silicon dimmer, and said rectifier bridge output plus terminal is connected with the input of said led drive circuit, said rectifier bridge output negativing ending grounding.
3. LED Linear Driving circuit as claimed in claim 1 is characterized in that said led drive circuit comprises:
At least one current sampling resistor, said current sampling resistor one end ground connection, the other end is connected with an operational amplifier and a multidiameter option switch;
One operational amplifier compares the voltage on the current sampling resistor of said each LED respectively with a reference voltage; Output is connected with said multidiameter option switch;
One multidiameter option switch, said multidiameter option switch connects said LED respectively, and said multidiameter option switch changes its conduction impedance according to said comparative result, with control section or all LED conductings.
4. LED Linear Driving circuit as claimed in claim 3 is characterized in that said reference voltage is an equal values, perhaps is different value.
5. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; Said voltage sample network comprises resistance or the resistance and the electric capacity combination of serial connection up and down; Said upward divider resistance or resistance are connected with said rectifier bridge output cathode with the electric capacity combination; Said upward divider resistance or resistance are connected the other end ground connection of said divider resistance down or resistance and electric capacity combination with the other end of electric capacity combination with following divider resistance or resistance with an end of electric capacity combination and the input of said absorption control circuit.
6. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; Said absorption control circuit comprises a comparator or operational amplifier; The in-phase input end of said comparator or operational amplifier is connected with a benchmark voltage, and the reverse input end of said comparator or operational amplifier connects the input of said absorption control circuit, and the output of said comparator or operational amplifier connects the output of said absorption control circuit.
7. LED Linear Driving circuit as claimed in claim 1; It is characterized in that said current absorption circuit comprises that a control switch and absorbs network, said absorption network is resistance or resistance and electric capacity combination; Said absorption network one end connects said rectifier bridge output cathode; The said absorption network other end connects said control switch input, said control switch output connecting circuit ground, and said control switch control end connects the output of said absorption control circuit.
8. LED Linear Driving circuit as claimed in claim 1 is characterized in that, said each led drive circuit and other led drive circuit alternations are perhaps worked simultaneously.
9. LED Linear Driving circuit control method that is applicable to controllable silicon dimmer; It is characterized in that; Comprise: a controllable silicon dimmer is connected with the input of a LED Linear Driving circuit through a rectifier bridge; The output voltage of the said rectifier bridge of voltage sample network measuring of described LED Linear Driving circuit is also exported a signal; The absorption control circuit of described LED Linear Driving circuit is according to this output signal controlling one current absorption circuit; Said current absorption circuit provides a stable maintenance electric current to make said controllable silicon dimmer conducting according to the control of said absorption control circuit, and the led drive circuit of said LED Linear Driving circuit is alternately perhaps worked according to said each led drive circuit of the positive terminal voltage decision of said rectifier bridge simultaneously, and the drive current of a LED lamp string is provided.
CN2012101061234A 2012-04-12 2012-04-12 LED linear driving circuit applicable to thyristor dimmer and control method CN102665324A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012101061234A CN102665324A (en) 2012-04-12 2012-04-12 LED linear driving circuit applicable to thyristor dimmer and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012101061234A CN102665324A (en) 2012-04-12 2012-04-12 LED linear driving circuit applicable to thyristor dimmer and control method

Publications (1)

Publication Number Publication Date
CN102665324A true CN102665324A (en) 2012-09-12

Family

ID=46774706

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012101061234A CN102665324A (en) 2012-04-12 2012-04-12 LED linear driving circuit applicable to thyristor dimmer and control method

Country Status (1)

Country Link
CN (1) CN102665324A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103200734A (en) * 2013-02-20 2013-07-10 英飞特电子(杭州)股份有限公司 Method and circuit of reducing current ripple output by current source
CN104333934A (en) * 2013-07-22 2015-02-04 四川新力光源股份有限公司 LED illumination driving circuit
CN105325061A (en) * 2013-06-28 2016-02-10 硅工厂股份有限公司 LED lighting apparatus and control circuit thereof
CN105340367A (en) * 2013-06-28 2016-02-17 硅工厂股份有限公司 Light-emitting diode lighting device and control circuit for same
CN105657909A (en) * 2016-03-25 2016-06-08 深圳市明微电子股份有限公司 Linear LED drive circuit capable of achieving light and color adjustment
CN106231727A (en) * 2016-08-05 2016-12-14 深圳市明微电子股份有限公司 Produce the method for the stable DC signal of telecommunication, reverse-blocking tetrode thyristor light-dimming method and device
CN105407581B (en) * 2015-12-24 2017-04-12 上海晶丰明源半导体股份有限公司 Dimming circuit, dimming chip, dimming system and dimming method thereof
WO2018205454A1 (en) * 2017-05-09 2018-11-15 易美芯光(北京)科技有限公司 Dimmable and color-tunable led light engine module and lighting device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101137261A (en) * 2006-08-29 2008-03-05 安华高科技Ecbu Ip(新加坡)私人有限公司 Device and method for driving LED
US20090167197A1 (en) * 2007-12-20 2009-07-02 Vimicro Corporation Driver and method for driving LEDS on multiple branch circuits
CN101808453A (en) * 2010-04-14 2010-08-18 上海晶丰明源半导体有限公司 LED lighting driving circuit and method by using compatible silicon controlled light adjuster to adjust light
CN102186697A (en) * 2008-10-20 2011-09-14 皇家飞利浦电子股份有限公司 LED light
TW201134293A (en) * 2010-03-29 2011-10-01 Integrated Crystal Technology Inc Integrated circuit for driving high voltage LED lamp
CN202602987U (en) * 2012-04-12 2012-12-12 上海晶丰明源半导体有限公司 LED linear driving circuit suitable for silicon controlled light modulator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101137261A (en) * 2006-08-29 2008-03-05 安华高科技Ecbu Ip(新加坡)私人有限公司 Device and method for driving LED
US20090167197A1 (en) * 2007-12-20 2009-07-02 Vimicro Corporation Driver and method for driving LEDS on multiple branch circuits
CN102186697A (en) * 2008-10-20 2011-09-14 皇家飞利浦电子股份有限公司 LED light
TW201134293A (en) * 2010-03-29 2011-10-01 Integrated Crystal Technology Inc Integrated circuit for driving high voltage LED lamp
CN101808453A (en) * 2010-04-14 2010-08-18 上海晶丰明源半导体有限公司 LED lighting driving circuit and method by using compatible silicon controlled light adjuster to adjust light
CN202602987U (en) * 2012-04-12 2012-12-12 上海晶丰明源半导体有限公司 LED linear driving circuit suitable for silicon controlled light modulator

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103200734B (en) * 2013-02-20 2015-09-02 英飞特电子(杭州)股份有限公司 A kind of method and circuit reducing current ripple output by current source
US9590487B2 (en) 2013-02-20 2017-03-07 Inventronics (Hangzhou), Inc. Method and circuit for reducing ripple of current output by current source
CN103200734A (en) * 2013-02-20 2013-07-10 英飞特电子(杭州)股份有限公司 Method and circuit of reducing current ripple output by current source
US9609702B2 (en) 2013-06-28 2017-03-28 Silicon Works Co., Ltd. LED lighting apparatus and control circuit thereof
CN105340367A (en) * 2013-06-28 2016-02-17 硅工厂股份有限公司 Light-emitting diode lighting device and control circuit for same
CN105325061B (en) * 2013-06-28 2018-02-27 硅工厂股份有限公司 LED light device and its control circuit
CN105325061A (en) * 2013-06-28 2016-02-10 硅工厂股份有限公司 LED lighting apparatus and control circuit thereof
CN104333934B (en) * 2013-07-22 2016-12-28 四川新力光源股份有限公司 LED illumination drive circuit
CN104333934A (en) * 2013-07-22 2015-02-04 四川新力光源股份有限公司 LED illumination driving circuit
CN105407581B (en) * 2015-12-24 2017-04-12 上海晶丰明源半导体股份有限公司 Dimming circuit, dimming chip, dimming system and dimming method thereof
CN105657909A (en) * 2016-03-25 2016-06-08 深圳市明微电子股份有限公司 Linear LED drive circuit capable of achieving light and color adjustment
CN106231727A (en) * 2016-08-05 2016-12-14 深圳市明微电子股份有限公司 Produce the method for the stable DC signal of telecommunication, reverse-blocking tetrode thyristor light-dimming method and device
CN106231727B (en) * 2016-08-05 2017-12-12 深圳市明微电子股份有限公司 Produce method, reverse-blocking tetrode thyristor light-dimming method and the device of stable DC electric signal
WO2018023953A1 (en) * 2016-08-05 2018-02-08 深圳市明微电子股份有限公司 Method of generating stable direct current signal, silicon controlled switch dimming method and device
US10470261B2 (en) 2016-08-05 2019-11-05 Shenzhen Sunmoon Microelectronics Co., Ltd. Method of generating stable direct current signal, silicon controlled switch dimming method and device
WO2018205454A1 (en) * 2017-05-09 2018-11-15 易美芯光(北京)科技有限公司 Dimmable and color-tunable led light engine module and lighting device

Similar Documents

Publication Publication Date Title
EP2760254B1 (en) Adjusting color temperature in a dimmable LED lighting system
CN103491682B (en) Linear switching constant-current LED drive circuit for control over peak current
US8841862B2 (en) LED driving system and method for variable voltage input
CN202374525U (en) Multiway LED constant-current dimming circuit
CN101605413B (en) LED drive circuit suitable for controlled silicon light adjustment
US9860958B2 (en) Dimming drive circuit of alternating current directly-driven LED module
US20150156841A1 (en) Arrangement and method for controlling light-emitting diodes in accordance with an input voltage level, by means of branch switches
CN105792441B (en) A kind of linear constant current circuit for controllable silicon light modulation
De Britto et al. A proposal of Led Lamp Driver for universal input using Cuk converter
US20110031890A1 (en) Led emulation of incandescent bulb brightness and color response to varying power input and dimmer circuit therefor
US10104737B2 (en) Dimmer control circuit, dimmer control method and lighting device containing the same
CN101494938B (en) Centralization type light change circuit for LED illuminating system
CN104125680A (en) Variable power dimming control circuit
TWI444092B (en) Control circuit module for light emitting diode lamps
US7902761B2 (en) Dimmable LED lamp
CN202172516U (en) Brightness and color temperature adjustable LED lamp
CN101646288B (en) Dimming method applicable to traditional dimmers and LED dimmable drive power
CN202721866U (en) New type driving circuit which is compatible with LED lamp tube
CN101657057B (en) LED power circuit
CN104041187A (en) Drive circuit of light-emitting element and illumination device
CN101636021B (en) LED constant current driving circuit
EP2676528A2 (en) A dimmable led driver and a method for controlling the same
EP2482615A1 (en) Lighting device and luminaire with failure protection
CN105282929B (en) A kind of full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode
TWI461106B (en) Lamp and the power controller thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120912