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DIY Controller

2262 Views 7 Replies 3 Participants Last post by  sergiu tofanel
Hi, I'm developing an quite easy DC DC controller, for an electric motor bike.

About it, I'm just starting for a simple half bridge, and then I'll move up for more sensorial details to check while it is working...

I've got an special question, on the design, I'm using an IR2110, it is a MOSFET driver, my doubt is about the voltage, it seems to work right with 15v, but my Batteries are 36V, so what should I use for the voltage divider? a DC DC converter or just a voltage regulator? I'm afraid that the voltage regulator whaist to much power...

What does the profesional controllers use?

1 - 3 of 8 Posts
I assume you are trying to provide power to Vdd, which takes a max voltage of 20V. You will have to provide some kind of voltage regulator, like the LM78xx series. In order to reduce power consumption, you could put a resistor between the +36V power node and the power input of the 78xx. Make sure the resistor is rated for the power though.
You can use a DC to DC converter then, or build your own. Most controllers will have a separate switching power supply based on a buck converter design. the most popular controller is the SG3524 and/or its derivatives.

For your case, though, I would ditch the IR2110. I's just too much trouble to use. You can easily build your own MOSFET driver circuits that will work just fine with 36V.
I am also curious as to why you need a half bridge to control a DC motor. It seems to me that a n-type MOSFET (or a gang of MOSFET's) will suffice. There is no need to reverse polarity, which is what the half-bridge and full-bridge configurations do.
1 - 3 of 8 Posts
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