High voltage dc stimulus controlled by Arduino

Projects General Guidance
1

Hello all,

I need some help or ideas about my project. I have to design an easy way to control a stimulus for my resistive load. It is 1 ms stimulus at 10Hz and I want to test different amplitude (20-40-even 100V if possible) While the current is very low (10-15mA). In my idea i want to use a supply voltage (max 40V available) and a switching voltage regulator in a boost configuration (ie lt1082) and then manage the stimulus with mosfet and an arduino connected to its gate (high side driver or low side driver). Am I wrong? Is there any easier way to implement that.
Thanks

2

Timing is no problem with an Arduino, also switching with a MOSFET is okay. A programmable power source in that range requires more (expensive?) hardware.

3

Thank you for the reply. I am using a power supply, but it provides max 40V and I don’t have the budget to buy a new one. So I am looking for a boost configuration, but it is hard to find voltage regulator with Vout 100V. In the datasheet of lt1082 there is a typical application of boost converter with Vout 90V. I will try this configuration along with the controlled switch.
Thanks

4

These are the circuits which I was talking about. I found on regulator's datasheet and on http://www.gammon.com.au/motors.
I have to verify the specifics of switch circuit, because in the website the supply is 12V
In your opinion, are they a reasonable solution for my project?.
Thanks

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5

Another option is to use a controller without an internal FET. That means that you can choose an appropriate high-voltage FET.
In the past I used an LT3758 with an Si4490 MOSFET. The Si4490 is rated to 200V so it was easily able to handle the ~130V I needed.
One of the more expensive parts of the project was the high voltage output ceramic capacitors.
Remember to make sure that the top feedback resistor has a high enough voltage rating too.

6

Thanks BJHenry.
I think your option is a little trickier but very interesting.
Do you have suggestion for the switching part?
I think I don't have to use the regulator if I use voltages under 40V, do I?
In that case, I can directly use a circuit like the one I posted.
Which one is the best solution in your opinion? High side driver or low side driver?

Regards