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Bonjour,
J'ai fais ce schéma qui fonctionne très bien. Il sert à faire varier la luminosité d'une ou plusieurs LEDs.
Je voudrais augmenter la puissance de ce montage en rajoutant des mosfets en // mais je ne sais pas trop comment m'y prendre.
Je précise...
Answer Snippets (Read the full thread at abcelectronique):
Je croyais que dans un mosfet, on ne parlais pas de courant mais transistor pour commander le ....
Il n'es pas soudé sur la carte.
+ Oui mais comme j'ai conçu moi même ce schéma et essais .
Monter un MOSFET à plat en tradi coté composants.
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Hi, this is really an electronic question but there is a machinist component!
I have made a power feed for my mill using a DC electric motor, nominal 48V, and I am building a PWM controller for it. The open circuit voltage on the PWM controller is about...
Started by The Artful Bodger on
, 10 posts
by 7 people.
Answer Snippets (Read the full thread at homeshopmachinist):
No mosfet on the face of earth is designed to take 70v to the gate, if it survived at ALL, its because theres a ....
What size is the resistor?
When the PWM controller pulls the output low, it may be sinking some the gate and the 70V supply.
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Hello All!
I am making a project on 3 phase induction motor drives , for this I require an inverter to convert DC AC . I am a bit confused that should the inverter be PWM based or it should be modified sine wave inverter ?
My aim is to save energy in ...
Started by atifsheikh_91 on
, 8 posts
by 4 people.
Answer Snippets (Read the full thread at edaboard):
With PWM modulation (SPWM), ie PWM (square wave signals where you continuously vary duty cycle according or .25kW 220v/1Amps ; for such moderate....
The usual method used to achieve variable motor voltage is pulse-width modulation (PWM).
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If you know how to do little search you can find this thread As you want to use 36V so change the resistance 4.7K to XK by using voltage divider only at top most op-amp output to have 12V for P-MOS above....
Help regarding H briges
Started by aamir1 pwm motor control on
, 7 posts
by 6 people.
Answer Snippets (Read the full thread at electro-tech-online):
Also see: IRS2001i have seen some ckts of H bridge but it consisted of 4 mosfets and no opamp what logic is here plz.
TTL in MOSFET gate drive out.
That drives two MOSFETs in a half bridge configuration.
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On Wed, 31 Dec 2008 03:45:34 -0600, "causalitist" <nate53143@hotmail.com
i set up a basic lm324 15kz uni-directional pwm motor controller.
this goes to a tc4422 mosfet driver and then to 2 irfp4668 mosfets that
are in parallel. there is one 1...
Started by causalitist on
, 6 posts
by 5 people.
Answer Snippets (Read the full thread at omgili):
And pwm generation use separate sources with
common ground, as the voltage through the mosfets with PWM several years ago and made this page:
http://www.boldinventions.com/gadget_pwm.html
My;nate53143@hotmail.com
i put a 22....
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Galera, acho estou com um problema: quando ativo o PWM do PIC para controlar uma carga resistiva escuto um zumbido que vem da fonte de alimentaусo(que ж uma fonte chaveda com capacidade para atж 30A) a carga consome apenas 15A e jр testei a fonte direto...
Started by itamar on
, 6 posts
by 3 people.
Answer Snippets (Read the full thread at asm51):
Certamente isto por PWM?
detalhe: o zumbido sз aparece quando a corrente da carga ж alta Alterei a frequЖncia do PWM para fora da faxa audьvel mas mesmo....
Jр tentou ajustar a freqЧЖncia do PWM fora da faixa audьvel?
chrdcv ainda nсo...
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Sir,
I have a problem my converter board and ic used osilater ic sg3525.this circut pwm regulation not properly working and change over time output volt shoot what is the problem please help me
Started by unelco on
, 5 posts
by 3 people.
Answer Snippets (Read the full thread at edaboard):
In that case, remove R1 and connect.
Is the problem I'm assuming you use this board to drive MOSFETs.
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I am using a mosfet IRFZ48 for my motor driver ckt. The specifications of the mosfets and the requirements for the motors match, but the mosfets get heated up. Also, my seniors who originally designed the ckt for their project faced no such problems at...
Started by akshatanayak on
, 4 posts
by 3 people.
Answer Snippets (Read the full thread at edaboard):
The MOSFETs?
How hot does the MOSFET get? Depending on the current going through, it may be natural to slow switching speed of the mosfets which increases the consumption while the mosfet turns on/off for the MOSFET....
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Hello,
I need to switch 24 VDC / 4 A by 14M2 PWM output (10 kHz, 10-60%). I also need to reduce mosfet heating as much as possible (idealy without a heat sink). Is there a mosfet with low resistance and gate capacity, that I can switch directly prom picaxe...
Started by MilanF on
, 10 posts
by 7 people.
Answer Snippets (Read the full thread at picaxeforum):
I've used IRL1004 for similar but check the capacitance vs PWM speed Does it need to be through is that 24V/4A at 10Khz is quite demanding, so we need to be cuter than choosing a random MOSFET via some parametric search (unless there is ....
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I've built an H-bridge circuit on a breadboard that powers a Traxxas EZstart motor. The motor runs optimally at 7.2 volts. I'm running it at 6v. It's based on the attached schematic. I'm using TIP122, TIP127 mosfets and 2N3904 transistors instead of what...
Started by Don23 on
, 6 posts
by 5 people.
Answer Snippets (Read the full thread at allaboutcircuits):
/2011/09/06/a-begin...to-the-mosfet/ If you changed from BJTs to MOSFETS int that circuit, then you needDid you check if you still have 6V power supply voltage? So, you are running this at DC -- not PWM that are preventing the ....
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