Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Cfl circuit explanation

Status
Not open for further replies.

myfaithnka

Advanced Member level 4
Joined
Nov 5, 2010
Messages
105
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
2,009
View attachment CFL.BMP

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.

pls help.

- - - Updated - - -

sorry there is a mistake, the bobbin size is e25.
 

godfreyl

Advanced Member level 5
Joined
Apr 18, 2012
Messages
1,981
Helped
632
Reputation
1,266
Reaction score
624
Trophy points
1,393
Activity points
12,776
The circuit's drawn wrong to start with. It looks like Q1 and Q2 are supposed to be an oscillator, but there's no power supplied to them - the collectors and emitters are both grounded at DC. I suspect the center tap on the transformer should be connected to +6V instead of ground. There also doesn't seem to be any feedback to the bases of the transistors.

Aside from that, the output will be AC, not DC. The circuit looks like it's for a CCFL.

 

irfan ahmad

Full Member level 3
Joined
Feb 17, 2012
Messages
181
Helped
53
Reputation
106
Reaction score
54
Trophy points
1,318
Location
LAHORE PAKISTAN
Activity points
2,201
rectifier the line voltages
filter them using high voltage polar capacitor.
make a high frequency oscillator (in cfl self start oscillator by feed back winging is used).
amplify this using high voltage transistor like 13001,13002,13003 or 13009.
give these voltage to the chock and convert these into high voltage.
pass these voltage through high voltage capacitor like 1kv or 1.5kv.
then pass this energy ( high voltage and high frequency) through cfl lamp.
your lamp is working now.
 

myfaithnka

Advanced Member level 4
Joined
Nov 5, 2010
Messages
105
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
2,009
12042013449B.jpg

sorry,this is the exact ckt. Pls help

- - - Updated - - -

12042013449B.jpg

SORRY,THIS IS THE EXACT CKT. PLS HELP
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top