Welcome to our site! EDAboard.com is an international Electronics 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.
Orson,
I think we have the same idea, the voltage loop is causing the instabilities.
Careful tuning of the FB loop compensator might solve the problem.
My point is, if your controller is seeing high output voltage,
then it will skip few pulses before it again give another pulse.
Why will it give another pulse if it sees the output has more
than enough? That is because your loop is not very fast enough to
see the output voltage rising or has...
Hi Mike,
May I ask, why are you worrying about the burst operation?
You said that it only happens at light load and/or when
Vout/Vin is low. Low Vout/Vin means you have low duty cycle.
This time, your Inductor voltage is very low and so is your inductors
ripple current. At this levels your...
Using the transformer is much simpler in my opinion.
If you can find a toroidal core, give me the part number
and I will provide you the number of turns including the
calculations. 100kHz is already high that's why I recommended
gate drive transformer.
Don't worry, I already used this method of...
Hi there...
If you have to isolate your ground, I would recommend you to use isolation transformer
instead of optocoupler. In this, you will no longer need to use high-side capable driver ICs,
you will instead use a small gate drive transformer, buffered by the totem-poles.
The transformer is...
You can check Simetrix/Simplis simulator.
It is designed for power electronics.
But sad-to-say, no glowing LEDs in there.:cry:
But of course, you can use probes to monitor
what's happening to your circuit...:razz::grin:
Hi Mike,
Is the burst mode happening even at high load conditions?
Normally, burst mode happens at light load conditions, this
is because your output capacitor isn't discharging much
during the switching cycle. Your voltage loop, even though
you are using a current mode controller, is...
I'm planning to make a DIY standalone charger for Sony Ericsson's BST-41 battery.
This will be used to charge my back-up battery.
The battery has 3-Terminals namely,
1 - Positive
2 - Temperature Sensor
3 - Negative
My problem is, I don't know what particular thermistor is used inside the...
ooh... that's really hot eem2am,:cry:
ok, let me know the other specs you need for your cap
and what is its specific purpose in the circuit...?
maybe you first try to use an e-cap then measure it's actual temp
while in operation. that would help you know how hot
that cap would be.
hi eem2am,
may i ask you, how hot is your ambient temp?
there are E-caps rated 105°C, you may be able to use it.
we use them for enclosed PSU, like chargers with no
overheating encountered.
34Amps would be fine, just choose a rectifier diode
could tolerate this. it would only occur for a very short period.
it's actually a better idea to use a relay.
which will turn-on at predefined bulk voltage level.
it's easier to implement. btw, you can use
a higher thermistor resistance...
ic=ib
you cannot design such ckt... because in the first place,
beta is inherent to the transistor. meaning its one of the
transistors parameters, hfe in its datasheet.:idea:
what you can only do is to design a circuit which is
basically independent of it. An example of this is the famous...
frequency is simply the number of cycles a signal has completed per unit time.
unit of measurement is CYCLES per SECOND or Hz...
for downlink, the frequency is lower because lower frequencies could reach a greater distance given the same output power from the antenna. lower frequency would...
for you 1st line of questions...
visit: https://en.wikipedia.org/wiki/Frequency_mixer
carier frequency signal is usually the higher frequency signal compared to the modulating frequency. It is called carier because it caries the information signal.
for example, in FM radio: The carrier...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
