thanks for all this great advice!
I cannot afford to patent it or anything, and i can't afford to set up myself, so i will be very happy to work as a designer to do these products just like any designer in any other company.
By the way, these are mains domestic LED lighting products, specially...
Hello
"Just to be clear: the "reflected" power concept is completely wrong. "
....the thing is, if you please see the following article..
http://www.scribd.com/doc/7694921/On-Switch-Mode-Power-Supply-Reference-Manual
..please see page 32, left-hand-side, 2nd paragraph down..
-It clearly...
Hello,
I have designed a boost converter with the following specification
Vin = 24V
Vout = 40V
Output power = 10W
Switching frequency = 100KHz
Continuous conduction mode
Output caps = 400uF
Output caps ESR = 0.33R
Boost inductor = 1mH
Ripple current = 10%
PWM controller = LT1241
Current mode...
thankyou Zappedagain,
Actually , i am wondering now if my uncompensated circuit is maybe OK.
the HV9910B uses this uncompensated control and must be OK, i guess...
http://www.supertex.com/pdf/datasheets/HV9910B.pdf
also, the IRS2541 uses this type of control and must also be OK, agin...
Hello,
A circuit that doesn’t work is not nice, but a circuit that does work when it shouldn’t is even worse!……….
I am designing mains LED lighting and am using UC3842 PWM controller since it costs just 20 Cents. (Specific LED drivers are too expensive)
I have designed two similar current...
You can use slope compensation in a current mode led driver
see
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1094,C1766,P81080,D26364
it also has a Vc pin for loop compensation.
Thanks VE1BLL,
i am now searching for latest literature on the lowest possible working voltage of a CFL though it does not seem to be available on the web.
Hello,
I am writing concerning powering CFLs (Compact Fluorescent Lamps) from the mains.
The following App Note from IRF.com shows a fluorescent lamp being powered from the UK mains (240V) ....
...but uses a "valley filler" passive power factor corrector, so the DC bus actually varies from...
Thankyou xnuke..
"I see iterative trial and error, and no satisfactory measure of a margin to instability is proposed."
..the supporters of this time domain analysis would say that they would get sufficient phase margin by changing compensation components until an optimised transient response...
Sorry i forgot to add the background to this post...
A few years ago i was at an interview at a branch of a large and well known switcher company and the Engineering Manager (who i notice often contributes technical articles to power electronic periodicals) said that no matter how many...
hello,
With these fora having recently debunked myths concerning
1. Power factor correction and efficiency
2. Right half plane zero of boost converter
...i wonder if the situation concerning ensuring the stability of a switcher power supply using time domain (step response) methods only is...
Hello,
Sorry if i've missed something here, but Equation 13 (page 21) of the following "Control Loop Cookbook" by Lloyd Dixon
http://focus.ti.com/lit/ml/slup113a/slup113a.pdf
gives the Boost's and Flyback's RHPZ as having a D in the denominator.
Sorry to drag this up again, but can we now...
Hello,
I write concerning a flyback PFC stage with L6561.
I refer to Figure 16, page 18 of the following app note...
http://www.st.com/stonline/products/literature/an/5956.pdf
There are feedback compensation components on both primary and secondary sides. Is this unusual?
I would have...
