H Bridge for Sewing Machine

Question

Hi i am looking for a H bridge design that could power a 24v 5A 120w DC Scooter motor that i will be using on an old sewing machine. i will be controlling it with an arduino and it will be stopping starting and reversing a lot so any advice would be welcome. i have both P and N channel fets in my bits box mostly TIP and IRLZ44N and a ton of BUS12 NPN 8A 400V if that helps.

Many Thanks Mick

D_Hersey · Answer

The bane of the H-driver is punch-through. This is when a non-adjacent pull-up and a pull down open with no current limit because the load isn't in the current path. Careful timing can avoid this. Putting a current sink below the H drive solves this. Using a split supply and two transistors solves this.

jw0752 · Answer

Hi Mick, I don't know if you have the book "Practical Electronics for Inventors" 3rd Edition by Paul Scherz and Simon Monk but on page 916 there are two circuits for H-Bridges using Darlingtons in one case and MosFets in another. You might also find that you can get an H-Bridge on a single chip that can handle that much current if properly heat sunk.

John

H Bridge for Sewing Machine

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