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Hi,
I see it´s getting difficult in communication. I ask to focus.
It´s a relay circuit. And I want you - for the time being - to forget about MOSFET.
May I ask for a sketch with (hand drawn)
* A 12V battery
* the 3-leg relay circuit of post#13
* a 21V Battery
* a 3 Ohms resistor
Nothing...
Hi,
Op amp as comparator
just a simple question: Why?
There are OPAMPs desingned to perform amplifier tasks.
There are COMPARATORs designed to perform comparator tasks.
They are designed differently .. each one optimized for it´s job... for a good reason.
So why not use an OPAMP as an OPAMP...
for power dissipation of a transistor this almost never is true.
(indeed I can only think of two extreme cases: 0% duty cycle and 100% duty cycle)
Example: I have an 10mOhms MOSFET switching a 10 Ohms resistive load with 50% duty cycle:
* then we have a square wave of about 0V/10V with 50%...
Hi,
I agree with FvM.
***
You expected a problem with the software.
But you posted only a part of your software.
We don´t know how all the LCD functions look like, nor whether (and which) LCD library you use.
So if there was a problem in these functions .. we could not find them.
Next time...
you say 1% because you add them with "square" method?
Square method is used when adding two independent RMS values.
But here the currents in the coils are not independent, they happen exactly at the same timing.
Thus one needs to add them quit using "+".
more thinking....
OK. You maybe...
Hi,
at least they clarify:
and
and
...
So litterally they say you can do RMS_power calculation, just as an exercise without being physicall/electrically useful.
Klaus
1714113844
added:
and in addition: One can say:
* paralleling two MOSFETS will result in half of total power dissipation...
Hi,
No. There is no fixed ratio.
The only thing is that the common mode causes current in the negative leg as well as in the positive leg, thus it causes twice as much current in the winding than a single ended current.
And it is about independent of output voltage. If you have the same...
Hi,
if you want to do it pyhsically and mathematically correct you need to know the values of C1, C2 and the impedance charging these Cs (this also includes the ESR of the capacitors)
It´s a lot of math, so better run a simulation.
***
A very inaccurate estimation:
positive side output...
Hi,
I don´t think there is something like "RMS power". For heating we use the "average of the power".
You may have RMS current and RMS voltage....
is here I_Max the peak of the current ripple ... and I_Min the minimun of the current ripple?
if so, then if I have pure DC (no ripple) then I_Max...
Hi,
or a simple analog switch. Like good old DG201 ...
But there are many many more others.
Just use the selection guide of your electronics distributor.
Klaus
Hi,
So we know the "load" is AC, 2Vpp, a few mA
--> What AC frequency?
We know nothing about the "control" side.
--> So tell us V and I capabilities of the control side.
--> For "fast" switching we need to know numbers.
The "opto" in opto triac means "isolated".
--> What is the voltage of...
Hi,
As Barry says ... you need to do timing analysis:
Consider:
* according to baud rate divider in the STM32 you get an baud rate error (fixed error)
* you get a baud rate error by the STM internal oscillator (drifting)
* and the errors in the communication partner
I´m sure there are STM32...
In addition:
even for a sine waveform it´s not "the rise time" because rise rate continously changes.
At 0° it is at positive maximum
at 90° and 270° it is zero
at 270° it is negative maximum.
--> So what the formula actually calcuates is the "maximum rise rate" for a sine.
Klaus
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