103 Threads found on edaboard.com: Cfl
Does anyone has simple cfl circuit??
If so let we know...
Professional Hardware and Electronics Design :: 26.09.2003 03:10 :: nvp :: Replies: 1 :: Views: 2033
Does anyone have a source (in europe) for replacement cfl tubes for TFT displays?
Hobby Circuits and Small Projects Problems :: 23.10.2003 09:48 :: froggy :: Replies: 0 :: Views: 782
i just think , what kind of ckts these cfl lamps has to drive the cfl rods.
i want to create my own cfl driver ckt for fun !
i hope it will not that much tuff !
thank you !
Professional Hardware and Electronics Design :: 13.02.2008 10:54 :: manish12 :: Replies: 4 :: Views: 1640
I need circuit diagram of cfl driver circuit from 12V DC. Can anybody help me on this.
Professional Hardware and Electronics Design :: 08.03.2008 07:27 :: zio_nneo :: Replies: 1 :: Views: 4285
I have the idea to design a battery-operated ballast for a 5W cfl. I made this schematic based on a push-pull topology, but I'm not sure if this topology is the right one for a cfl ballast. In a lot of schematics I see half-bridge designs. Is it better to use this topology for the
Analog Circuit Design :: 17.03.2008 00:40 :: jancambodia :: Replies: 0 :: Views: 705
At the moment I'm designing a cfl ballast, running from a 12V battery. The ballast uses the push-pull topology to create a secondary alternating voltage. With an LC oscillation circuit the cfl is first preheated, then frequency is changed to let LC oscillate to ignite the lamp. When the lamp ignited, frequency is changed to the burning fr
Electronic Elementary Questions :: 21.04.2008 09:25 :: jancambodia :: Replies: 0 :: Views: 911
recently i changed my old bulb with a new cfl (compact fluorescent lamp). but there is a problem; when i switched off the lamp, it begins to flicker with a time constant of about 2s.
i searched for the reason and i found this problem. it caused by a small neon indicator inside the switch. it used with a large resistor (100~150k) and need
Electronic Elementary Questions :: 12.11.2008 12:54 :: amir81 :: Replies: 10 :: Views: 5368
I require a Transformer design software for cfl electronic ballast working in Flyback topology with flyback transformersin solar applications like lanterns, street lights etc.. . Is there any software available for Flyback transformer design. If available please any provide.
Software Requests :: 02.12.2008 14:45 :: Yasinji :: Replies: 0 :: Views: 327
One of my friend gave me an emergency light with 11 watt cfl (AS shown in the photo) which operates with an Push pull inverter circuit powered with 6 volt 10 Ah battery. It has a peculiar problem which he coudnt solve. Initially the tube was blackened, and i replaced it. Within 10 minutes i lost the tube due to blackening at the end
Hobby Circuits and Small Projects Problems :: 30.05.2009 02:11 :: mvs sarma :: Replies: 10 :: Views: 4924
I a designg a cfl ballast from 12V DC input to 18W ouput (50VRMS & 360mA current) using a push pull transformer. The cfl used is Osram Dulux L series 18W lamp with preheat open circuit voltage of 190V and current of 750mA with 2.4S pre-heating time at 66KHz frequency . The running voltage is 50Vrms and 360mA Irms at Frun of 38KHz. How can I design
Software Requests :: 23.06.2009 08:29 :: Yasinji :: Replies: 0 :: Views: 780
Would i be correct in thinking that the following cfl ballast control IC (IR21571)does NOT actaully "regulate" the current in the cfl?
Page 14 details what the current sense resistor does.
-It just seems to be for detecting fault conditions, and when it does it shuts
Power Electronics :: 27.09.2009 07:57 :: eem2am :: Replies: 0 :: Views: 487
To mention a simple fact that invalidates your calculation, the cfl characteristic is actually far from resistive behaviour.
It's rather a typical electric arc/gas discharge characteristic with a constant voltage drop plus some negative inner resistance.
See a measurement of a mains operated 36W/120cm fluorescent lamp for reference. In addi
Power Electronics :: 04.10.2009 07:01 :: FvM :: Replies: 1 :: Views: 2733
the offline cfl ballast on page one of
...does zero voltage switching of the fets (zvs).
In fact, all Fluorescent ballasts of reasonable quality give zvs operation.
so.....please could you tell why an engineer at a big lighting exhibition told me that the fets intri
Power Electronics :: 06.10.2009 13:55 :: eem2am :: Replies: 0 :: Views: 467
Page 3 of the following shows an offline cfl ballast
please may i ask......does R1 continue to draw bias current from the DC bus after start-up, whilst the lamp is running?
Analog Circuit Design :: 07.10.2009 15:15 :: eem2am :: Replies: 0 :: Views: 1164
I wanted the details of the Transformer and the PCB Layout in PDF format of Oh no! Not Another cfl Inverter.
The article is found at:
I have also attached some more details regarding the Transformer number of windings. But, there is no mention of the Gauge (Thic
Electronic Elementary Questions :: 23.11.2009 09:56 :: pravardhan :: Replies: 5 :: Views: 2445
Actually i don't know how to desing fuse for 20 watts cfl bulb. What i am doning , i have supply 220v to a room and the condintion is in a single room it can use a cfl bulb of 20 watts only, if a person in a room use cfl bulb more than 20 wats it should blow the fuse, acordind ti my basic knowledge i have calculate fllowing:
Hobby Circuits and Small Projects Problems :: 01.02.2010 14:19 :: neezan :: Replies: 7 :: Views: 2355
cfl lamps are hot cascode. LCD lamps are usually cold cathode. It doesn't sound like a good thing to do, although I haven't looked at circuit details. Hot cathode lamps have a heater and a preheat cycle.
Electronic Elementary Questions :: 11.04.2010 11:07 :: keith1200rs :: Replies: 3 :: Views: 1285
I buy Sylvania cfl's. The color temperature of 3k is pure white and even though they are also made in China they last for years. A couple failed and after phoning Sylvania they sent coupons for replacements.
The free cfl's from my electrical utility company were recalled and replaced because the Chinese manufacturer stole another company's certi
Hobby Circuits and Small Projects Problems :: 13.04.2010 13:58 :: Audioguru :: Replies: 7 :: Views: 1887
I found 3w cfl in market. Bought a cartoon to put as nigh lamp, in stairs and here and there replacing high power cfls to conserve energy.Within a week it was found that most of them turned black at their ends with diminished light. Some of them even failed to lit. I opened them and found similar type of circuit inside instead of hi-frequency switc
Electronic Elementary Questions :: 05.05.2012 05:18 :: ALERTLINKS :: Replies: 9 :: Views: 5205
What's the difference between a cfl and a Ccfl?
Electronic Elementary Questions :: 16.03.2011 17:39 :: eem2am :: Replies: 10 :: Views: 1164
You have got the wrong sort of cfl. The dimmer works by pulsing the mains on and off rapidly, the cfls have an oscillator in them that is running slower then the dimmers pulses so the results are unpredictable. You can get cfls that sort out the pulsing mains and appear to dim correctly.
Electronic Elementary Questions :: 04.08.2011 14:45 :: chuckey :: Replies: 5 :: Views: 930
Could you help me :how value of R.C,L must be change for drive my 4watt 120Vac fluorescent tube.
In this schema 11w .240v cfl lamp driver.
Thank you in advance
Microcontrollers :: 06.10.2011 09:36 :: minhlam :: Replies: 9 :: Views: 774
More information needed:
1. what is the triac type and rating?
2. what are the cfl ratings (voltage, power) ?
3. what power source are you using (voltage, AC/DC, generator)?
Under normal circumstances it is quite safe to leave the gate voltage on all the time, either you are using mismatched cfls and triac or you are driving the gate with far too
Power Electronics :: 26.11.2011 04:12 :: betwixt :: Replies: 4 :: Views: 987
Could you please give me a design for high frequency(30kHz-50kHz) power amplifier(up to about 25W). I'm gonna drive a cfl tube using this power amplifier instead of conventional ballast circuit.
Electronic Elementary Questions :: 22.02.2012 05:16 :: isurunalaka :: Replies: 3 :: Views: 646
I couldn't decode RC5 when my cfl (room light) is ON!! I think its spectrum may contains some 38KHz modulated light...
So, Now I am confused what to do if I want to decode RC5 in such condition...
Also, don't know how TV is working properly even in such conditions.....
Microcontrollers :: 25.02.2012 16:27 :: vinodstanur :: Replies: 9 :: Views: 367
I am looking to produce a design for cfl running DC supply, Without using Inverter.
Anyone Know this knid of design, Please send me the related document, images and web-links.
Thankz for the reply.........................................
Other Design :: 09.04.2012 09:11 :: nandhakumard :: Replies: 2 :: Views: 802
I have a few questions...
> I saw document for cfl lamps circuit In that they are discussed about d resonance . Actually, My mind is focused on Why d Resonance is applied/used for this application?
>>and what are the other applications using resonance?(find attachment)
> I got one simple idea to add this one battery in
Other Design :: 30.04.2012 11:55 :: nandhakumard :: Replies: 1 :: Views: 803
this is a 32 watts 220V ac cfl lamp
when it is switched off for the night the lamp flickers or rather blinks at regular intervals of approx 1 minute even though there is no power supply to the bulb
Can anyone please give an explanation why it is
behaving in this eerie manner at night?
Electronic Elementary Questions :: 10.05.2012 10:31 :: Tipu606 :: Replies: 6 :: Views: 1281
I am looking at methods to dim a cfl as conventional method does not work.
Please suggest a circuit that can control the dimming of a cfl through a microcontroller
on a 230V ac line.
Thanks in advance!
Professional Hardware and Electronics Design :: 02.06.2012 08:30 :: syedaban :: Replies: 2 :: Views: 420
Could anyone please give me some understanding about how this half bridge drive circuit's oscillation frequency is obtained? First lower transistor turns on due to diac and then current flow through 3 winding transformer's primary winding in a manner that is going to turn on upper transistor when primary core is sa
Analog Circuit Design :: 07.06.2012 04:58 :: isurunalaka :: Replies: 3 :: Views: 703
I want a internal circuit of cfl bulb for PCB Project. if you have that circuit please sent to me.
Electromagnetic Design and Simulation :: 13.02.2013 10:45 :: Salim Saheb :: Replies: 0 :: Views: 178
i want to drive a commonly available cfl (fluorescent lamp) of 15 watt by the means of a 6 volt 4.5 ah battery available in emergency lights . i searched it , but came to know about it only but couldn't find any circuit or unit . . .
All the available units are designed for 12 volts battery but my aim is drive it with 6 vo
Hobby Circuits and Small Projects Problems :: 27.03.2013 04:56 :: rajaram04 :: Replies: 9 :: Views: 886
Pls can any one explain how this cfl circuit works ???
I am trying to reverse engineer this circuit. I am not sure how it selects frequency 63 KHZ, how this circuit is designed to provide HV DC for cfl.
- - - Updated - - -
sorry there is a mistake, the bobbin size is e25.
Power Electronics :: 12.04.2013 07:11 :: myfaithnka :: Replies: 3 :: Views: 305
i am new for this forum i want to make DC 12v to 20w cfl without any modification in the cfl and low cost can some one give me best way for do this please help me
Can you elaborate this?
You can buy factory maded 12V cfl in shop. Better look for led based lamps.
Analog Circuit Design :: 23.05.2013 04:18 :: tpetar :: Replies: 3 :: Views: 282
Is it possible for a cfl to produce Skin effect ?
The working frequency is 13 KHZ, material is aluminium coated over plastic( reflector+ holder),approximate voltage is 300 V. the current should be around 40 mA.
Mathematics and Physics :: 29.05.2013 12:49 :: myfaithnka :: Replies: 1 :: Views: 211
The data sheet says that they can run directly from a 12 V battery.
Professional Hardware and Electronics Design :: 28.09.2002 17:51 :: flatulent :: Replies: 2 :: Views: 1210
I am looking out for a timer based on IC555 which can be triggered by a PIR . and the timer is used to swithch on a floresent tube or cfl tube for a duaration of 5 minutes to 20 minutes.
The tube shud be able to activated and swithced off automaticaly after the preset time.
Electronic Elementary Questions :: 20.11.2005 13:50 :: balaji_moorthy :: Replies: 2 :: Views: 1830
please describe your problem clearly.
usually, time step is determined by cfl condition.
Electromagnetic Design and Simulation :: 15.01.2006 20:47 :: maple :: Replies: 5 :: Views: 766
hi to all,
i am working with nanometer range interconnect design. which numerical simulation tool like fdtd i can use?
can i use fdtd. will it obey cfl limit.
Electromagnetic Design and Simulation :: 17.01.2006 04:36 :: ramani :: Replies: 1 :: Views: 411
Hi, Ramani: What is the cfl condition? From what I see, small size is not critical as long as the the overall size is small. An optical antnena is an example. The cell is very small. However, the whole structure is about half a wavelength and we can still solve it easily on IE3D. Certainly, as I mentioned earlier, if you have some feature size very
Electromagnetic Design and Simulation :: 18.01.2006 12:15 :: jian :: Replies: 15 :: Views: 1630
can anyone tell me how can I use cfls (compact fluorescent lamps) with open heaters like the Ccfls (cold cathode fluorescent lamps). The last use high voltage and have not heaters. I put a cfl on a small inverter for Ccfl and operates.
So I need a small converter from mains to high voltage, and if it's possible to (...)
Professional Hardware and Electronics Design :: 22.01.2007 06:12 :: mitsos :: Replies: 0 :: Views: 929
ADI means Alternating direction implicit.
you can read below para for more information,
The nite-dierence time-domain (FDTD) method is formulated by an explicit
nite-dierence scheme using central dierences on a staggered Cartesian grid
(both in space and time) of Maxwell's equations. It is second-order accurate
both in time and space. I
Electromagnetic Design and Simulation :: 15.04.2007 06:59 :: hamidrezakarami :: Replies: 2 :: Views: 871
I want to switch (just ON/OFF no Dimming control) 20 compact flourcesent lamp using triacs (BT139 or BTA140) and an opto isolator(MOC3021). every lamp a separate triac, and i control them with a mcu(AVR).
I have tried the Typical Application Circuit in MOC3021 datasheet, but i have too many problems! Triacs burns! With ALL(or most of them
Analog Circuit Design :: 13.07.2007 15:36 :: Parham :: Replies: 0 :: Views: 1713
hi guys... i have a problem...
As a lot of construction work and digging up is going up in my area i face power cut sometimes.... its pain when ur exams are coming...
so here what i have
a rechargable 12v DC battery
A 20W cfl... now... i wanna know how can i use it to make an emergency table lamp!
Electronic Elementary Questions :: 29.11.2007 08:20 :: INS-ANI :: Replies: 1 :: Views: 1403
use... Renewable resources of energy
use cycle for short distance instead of car....
use smart electronics circuits which detects the environment and adjust light and cooling/heating in the room or office..
use cfl lamps.
Electronic Elementary Questions :: 23.03.2008 13:44 :: nikhilele :: Replies: 6 :: Views: 606
cfl is emitting strong electromagnetic field on operating frequency of it's electronic circuitry. Frequency is about 40kHz. This can cause problems on controllers etc. You may replace cfl with incandescent bulb to check the existance of possible other causes for your problems.
Presence of that field can be verified by oscilloscope if it's probe is
Hobby Circuits and Small Projects Problems :: 24.04.2008 12:14 :: Borber :: Replies: 20 :: Views: 5339
how i can on the ATX power supply for my micro-controller board .
in my universal rf remote controller board , after switch on the cfl1-4 , microcontroller restart .
cfl drivers with opto triac , isolated relay , but still there is problem .
board try with cd ,dvd player power supply , tran
Microcontrollers :: 14.08.2008 13:44 :: manish12 :: Replies: 7 :: Views: 853
The fluorescent tube lights in my kitchen and basement don't use a starter. The tubes are called Rapid Start and have filaments that light and heat each end. The ballast is a transformer and produces a current-limited high voltage that starts the tube lights.
They turn on almost immediately without flickering.
cfl also don't have a starter. The
Electronic Elementary Questions :: 24.10.2008 12:15 :: Audioguru :: Replies: 9 :: Views: 10381
I have just taken apart a (240V rms, 50Hz) 15W Compact fluorescent bulb and done tests on it. The Input DC Bus has 110V of ripple on it (DC Bus goes from 220V to 330V with 10ms period.
It's DC bus (following the diode bridge) has one 3.3uF , 400V electrolytic capacitor on it. It is Aishi GA series cap:-
Electronic Elementary Questions :: 14.12.2008 12:46 :: eem2am :: Replies: 4 :: Views: 3914
Apart from what has been said regarding true and apparent power, the measurement may be inaccurate.
I tested some electronic cfl, and found a real power input of +/- 5% around the nominal value. The power factor varied
between 0.5 for a cheap no-name DIY market product and 0.71 for a major manufacturers product. See respective
Analog Circuit Design :: 21.12.2008 11:38 :: FvM :: Replies: 15 :: Views: 8418