Hi, a very rough approximation, would be that the outputpower is
RL*I^2, where I=75V/10.
I've roughly put the coupling factor k between the transformers equal to 1, but it should rather be somwere 0.5
RF, Microwave, Antennas and Optics :: 26.11.2003 10:36 :: StoppTidigare :: Replies: 3 :: Views: 2281
I am trying to drive a mosfet in a dc-dc boost converter. Does anyone have a design that I can use in PSpice, or is there a chip already available in the PSpice library?
Hobby Circuits and Small Projects Problems :: 08.12.2003 14:10 :: ee01akk :: Replies: 2 :: Views: 2324
Hi everybody, I would like to build a push-pull amplifier (minimum 100W) and I miss few thing (almost everything) to achieve my project. I will need a lost of help from all of you.
My first question is, mosfet or darlington ?
Second, how do I desing the circuit to avoid the crossover-distortion (flat)
and finally, can someone send (...)
Analog Circuit Design :: 10.07.2007 00:45 :: sec :: Replies: 23 :: Views: 2081
the way you have biased the circuit is right only also the mosfet is stable even through temperature changes....
i think you have to be careful in the selection of resistors and caps to be used....
RF, Microwave, Antennas and Optics :: 25.07.2007 09:49 :: A.Anand Srinivasan :: Replies: 9 :: Views: 4492
How to invert 3Vdc to 115 Vac using mosfet circuit, send me the circuit if anybody possible to support . Also is it reliable for some long time usage for their components:idea::D
Hobby Circuits and Small Projects Problems :: 13.09.2007 09:23 :: dmmahesh :: Replies: 3 :: Views: 1926
what is a firing circuit for a mosfet could you elaborate?
Analog Circuit Design :: 13.09.2007 12:43 :: ambreesh :: Replies: 5 :: Views: 2606
I am doing my project on inverter. So I want gate driver circuit for mosfet and at the same time circuit diagram of multilevel inverter
Professional Hardware and Electronics Design :: 05.02.2008 13:25 :: udayj :: Replies: 9 :: Views: 10806
I am driving DC motor 12volts 6Amp via mosfets with Heat sink & cooling fan, the problem is that when I decrease the duty cycle below 20% the mosfets become very very hot (some times burns out),
It works fine above 50% duty cycle runs motor under normal temperature.
How I can protect mosfets from burning??
Hobby Circuits and Small Projects Problems :: 26.08.2008 05:21 :: hameeds01 :: Replies: 38 :: Views: 11833
These are proper discrete drivers.
use a mosfet gate driver IC.
* EDIT You have twelve volts available put the collector of the NPN (fig 23) to the twelve volt rail. As long as your FET can take the Vgs.
Analog Circuit Design :: 09.11.2008 19:08 :: max0412 :: Replies: 2 :: Views: 4402
I am trying to find a gate driver for a P Channel mosfet, but can't find anything. Any suggestions? Id= -6.5A, Vgs= -10V and Vdd= -50V.
Professional Hardware and Electronics Design :: 11.11.2008 14:34 :: jkahn :: Replies: 5 :: Views: 7042
Check ringing frequency .refer to Unitrode app note on snubber design you can calculate values of res. & cap.
First check leakage inductance of your transformer.
Increase value of gate resistor to reduce rise time / fall time. This will also reduce ringing. But increase heating in mosfet so don't increase beyond 33E/47E
Power Electronics :: 11.05.2009 01:07 :: 1206.sachin :: Replies: 7 :: Views: 6904
Hi everyone,can anyone please explain to me how the circuit in the above link works?How the mosfet push pull driver works in the circuit?and what is the purpose of putting a capacitor at the gate of the P-channel mosfet.(main concern is to understand how the push pull driver opereate and the (...)
Hobby Circuits and Small Projects Problems :: 29.11.2009 07:03 :: roronoa :: Replies: 0 :: Views: 1716
... It should deliver as much power as possible to a 20 ohm load. Therefore, I am trying to make the output impedance as near to 20 ohm as possible.
No, to achieve this, Rout ≪ 20Ω !
Thus, obviously I should use a common drain mosfet. However, the problem is output impedance of a common drain mos
Analog Circuit Design :: 14.02.2010 07:31 :: erikl :: Replies: 7 :: Views: 2715
What are you trying to accomplish? I'm by no means an expert, but I used PWM for controlling a simple heater output, and I simply connected V+ to the heater, then the low side of the heater to the drain of an NPN mosfet, then the NPN mosfet source to ground.
Hobby Circuits and Small Projects Problems :: 26.06.2010 14:16 :: dksoba :: Replies: 12 :: Views: 1881
i like to drive this mosfet with a microcontroller , but i have a doubt on the protection of the PIN of the MCU, i suggest ti insert a resistor between the gate and the PIN of the MCU, on order to limit current, have you an idea on how to c
Electronic Elementary Questions :: 21.06.2011 11:26 :: yassin.kraouch :: Replies: 99 :: Views: 4099
i a novice in electronic and i'll appreciate if anyone can help me with the problem am facing with my diy inverter i output mosfet short at times when i connect my transformer then i get 240volts at d transformer output at 13 volts but when i plug my t.v (79watts) d volt drops to 201volt with a bulb of 60watts it drops again to usin
Power Electronics :: 18.03.2012 06:32 :: mossses :: Replies: 39 :: Views: 1152
Thanks alot, I do have some light on the part of the mosfet, PWM and gate driver.
"BTW : for secondary , the start point isn't correct"
May i know which is the start point? Do you mean that the centre is tapped wrong at
Do i physically get a block core that look something like the one i've drawn?
Any specific CORE tha
Power Electronics :: 17.05.2012 08:42 :: samhtcandroid :: Replies: 12 :: Views: 723
I want to make 2kw inverter at 24 volt battery and 50hz freq: using sine wave PWM technique.
How can i calculate current through mosfet and voltage ,watts ,and which type mosfet can i use, how many numbers ? Please help me
This has been explained here:
Power Electronics :: 24.06.2012 12:12 :: Tahmid :: Replies: 11 :: Views: 1324
In general, you should not rely on mosfets matching well, unless you've binned them so they match. In a single production run, the mosfets will usually match okay; they might differ only by 50mV or so. However, if you obtain two mosfets from two different production runs, they might be 200mV off from each other. A difference this large would (...)
Electronic Elementary Questions :: 10.07.2012 11:54 :: ZekeR :: Replies: 2 :: Views: 407
Concerning power mosfets encapsulated in pack case, assemblable w/ screw, can be interconnectable w/ stack metalic plates, properly isolated.
It makes easier build the power stage, and also restrict current flow into a confined region.
I saw this concept with a pack IGBT set on a 5KW UPS based on push-pull topology, allowing a very (...)
Hobby Circuits and Small Projects Problems :: 03.01.2013 20:06 :: andre_teprom :: Replies: 12 :: Views: 931
there a way to protect the mosfets from saturating using resistors or capacitors?
Due you are under development stage, I suppose you are using a DC regulated power supply, with limit current protection, wright ?
That´s the standard procedure, and if the case, there is no need to do that you are asking.
Power Electronics :: 25.02.2013 05:25 :: andre_teprom :: Replies: 17 :: Views: 524
I'm try to run mosfet with high frequency..30 khz..10 duty cycle. i got turn off switching in mickro second but when i read data sheet is about nano second. Is it normal?, or is anybody have idea to reduce this turn off switching90037
Microcontrollers :: 25.04.2013 08:22 :: mr.man :: Replies: 2 :: Views: 256
I have a problem that I would like you to address.
I have an analog board which produces a 1 Mhz signal (close to sine wave).I used a mosfet push pull terminology using a 24v DC input to generate this signal by switching the DC input using these Fets over a planar transformer.
The problem is that one of the (...)
Analog Circuit Design :: 12.05.2013 09:49 :: udir :: Replies: 5 :: Views: 333
In my inverter there is a IC Sg3524(16 pin ic) used for osscilation & pin 11 & pin 14 used for Mos drive voltage, as we know when these voltage has any type of difference then mosfet is blow out.
Plz suggest me to some modification in circuit if any voltage diffrence found in both mos drive voltage then s
Power Electronics :: 06.08.2013 23:49 :: eiphan :: Replies: 5 :: Views: 418
I am sending you a schematic , I can drive a series rlc circuit directly with a microcontroller.However I need more current to drive it.I can not design a switching circuit or driver for it.I use a power n cahnnel mosfet but system is not working!Can you command on why it is not working.All I know is if gate-source voltage is greater
Professional Hardware and Electronics Design :: 24.04.2003 17:59 :: Free_Will :: Replies: 5 :: Views: 1512
i am designing a power supply which employs a 2 stage down converter. A buck followed by a push-pull converter.
the circuit has 3 mosfets(IRF840) whose PWM will be controlled by PIC16F877. i have the following queries:
1) while switching the Buck converter mosfet, during the off state, the source will be (...)
Professional Hardware and Electronics Design :: 25.05.2003 14:29 :: lithium :: Replies: 1 :: Views: 1432
what's the output impendence do you preferring? a R-R OPAMP plus push-pull mosfet pair is an option.
Analog Circuit Design :: 15.03.2005 01:39 :: ezpcb :: Replies: 5 :: Views: 953
i attache equivalent circuit of your diagram.
M4 & M5 used to bias M1 & M2.
when we connect drain of M4 to drain of M5. it is equal to set two mosfet threshold voltage equal to zero.
In this way output/input charactristic will be changed. and it produce distortion.
Analog Circuit Design :: 13.03.2006 14:18 :: Davood Amerion :: Replies: 9 :: Views: 741
let start from output section. my old 3-phase inverter project made use of power mosfet like IRFP450 it stand for 14A,500 volts.
be carefull about dead time of all power mosfet and make sure there have no floating gate before turning that DC 400V input voltage on,
or let us know when u get a BOOM!!!
Analog Circuit Design :: 19.02.2007 12:00 :: Koson :: Replies: 7 :: Views: 1185
I encountered a problem during switching up the two-transistor forward converter topology. I used TL494 as my PWM generator and connect the HO pin to IR2110's HIN and LIN.
From IR2110, the VB pin is connected to a dc voltage of 10V and the VS pin is connected to the source of the upper mosfet while the HO pin connected to the gate of the upper
Professional Hardware and Electronics Design :: 08.03.2007 00:36 :: waremon :: Replies: 2 :: Views: 4358
Yes, what ll happen when both the transistors are in saturation, the two mosfet
behave as a divider. the output is Ron(nmosfet)/(Ron(nmosfet) + Ron(pmosfet)).
In the basis CMOS inverter ( having NMOS and PMOS ) what ll happen when both the transistors r in saturation and what ll be t
Electronic Elementary Questions :: 18.06.2007 09:43 :: funster :: Replies: 4 :: Views: 1543
If i increase the PWM frequency (not the dutycycle) , the transient voltages across the inductive load will increase or decrease? I using a push-pull mosfet driver..
Analog Circuit Design :: 10.08.2008 12:10 :: Faizan Jawaid :: Replies: 8 :: Views: 659
hi friends can anyone explains this circuit how the mosfet is turned off when over
Analog Circuit Design :: 02.09.2008 07:22 :: praveen_palaparthi :: Replies: 3 :: Views: 699
Does any reader know what is the cheapest SMPS PWM controller with on-chip mosfet driver in the world?
The cheapest i have found so far is the MC34063 at 20 Cents (US$)
I have an application where i will need a lot of them, so need the cheapest
Professional Hardware and Electronics Design :: 15.01.2009 14:18 :: eem2am :: Replies: 3 :: Views: 1702
i tried a ckt to make light weight ferrite core base hf 50 hz invertor.first i converted 12 v dc to 350 v dc with a center tapped ferrite smps transformer with push pull tolology and hf switching.after that i converted this 350 v dc to a square wave 50 hz op with H bridge.But even after using currentt limit circuit to the outputs the (...)
Analog Circuit Design :: 20.08.2009 13:11 :: anan1975 :: Replies: 1 :: Views: 1761
By increasing the gap the inductance wil go down. The inductor current will increase but, as previously mentioned, this is a technique used to avoid saturation. Your mosfet will heat more, leakage will increase (bad regulation) and the EMC will increase.
Power Electronics :: 05.09.2009 10:58 :: pauloynski :: Replies: 3 :: Views: 1069
I want to make a motor driver to drive the power window motor that use to drive up and down the car's window, so far, I have the component like FDD8424, 2N3904, 2N3906, LTP521-2, what kind of circuit should u guys advise me to do? I need to drive the motor in 2 directions, the power window need 12V, nearly 3A to start driving. My input
Power Electronics :: 25.02.2010 04:09 :: averafter :: Replies: 1 :: Views: 872
There are no component values on the circuit and the connection of the DR1 input is not defined, so I can only generalise as to how it works.
If you label the transistors Q1 to Q5 left to right, then Q2 will turn on when the voltage on its base is above around 3.4V (2.7V plus one Vbe drop). The exact input voltage this happens at will depend on
Electronic Elementary Questions :: 22.03.2010 12:40 :: keith1200rs :: Replies: 5 :: Views: 1294