Hello,
I am currently trying to build my first H-bridge consisting of four NPN IRF520 transistors and four 1N4001 diodes. So far, so good.
However I am somewhat worried regarding the possibility of causing a short if the H-bridge inputs are not correct.
I know Arduino sends some random values to the pins while its being programmed and can possibly cause damage to the circuit so I was wondering if there was a way to prevent that from happening?
Thanks !
I am currently trying to build my first H-bridge consisting of four NPN IRF520 transistors
How do you do the high-side switching with N-Channel MOSFETs?
I am somewhat worried regarding the possibility of causing a short if the H-bridge inputs are not correct.
Many commercial H-Bridge circuits use internal logic to prevent the high-side and low-side MOSFETs from turning on at the same time. For the Arduino, most of the pins default to INPUT so you can use pull-up and pull-down resistors to set default values. Be use to do digitalWrite() before pinMode(,OUTPUT).
You can but H-Bridge chips that connect to external MOSFETs of your choice.
Poster child discussion for DIY h-bridges.
johnwasser:
I am currently trying to build my first H-bridge consisting of four NPN IRF520 transistors
How do you do the high-side switching with N-Channel MOSFETs?
I am somewhat worried regarding the possibility of causing a short if the H-bridge inputs are not correct.
Many commercial H-Bridge circuits use internal logic to prevent the high-side and low-side MOSFETs from turning on at the same time. For the Arduino, most of the pins default to INPUT so you can use pull-up and pull-down resistors to set default values. Be use to do digitalWrite() before pinMode(,OUTPUT).
You can but H-Bridge chips that connect to external MOSFETs of your choice.
I assume I can connect them the other way around so I do not need a couple PNP ?
Also, what value should I set the pin to? Low?