Hello everyone! I'm trying to automate the flipping of voltage (600 V) in a physics apparatus using arduino. For this purpose i have a high voltage H-bridge which works at high voltages. Datasheet: https://www.onsemi.com/pdf/datasheet/nxv65hr82d-d.pdf
But i seem to have an issue with biasing the gates of transistors of H-bridge since the top 2 transistors Q1 and Q3 (in the above image) do not turn on completely since the voltage biasing needed for top 2 transistors is different from the bottom 2 transisors because the source of different transistors are at different voltages (i have connected arduino ground to the ground of bottom transistors Q2 and Q4) .
Since i have only a single ground in the arduino , i realize i think i need to offset the arduino output from (0V,5V) to (600V,605V) to bias Q1 and Q3 . I have come across some ideas.
Summing amplifier can offset but I haven't found any OPAMPS that have such high saturation voltage of 600V
Gate drivers : I haven't found any integrated module working at such high voltages. Is it safe / recommended to construct one directly using MOSFETS? Could the high current flowing in such a MOSFET to ground damage the arduino?
Any suggestions/ comments are welcome! Thanks in advance
First, you should have an optical isolator to isolate, you, you're Arduino, and the computer if USB is connected, from the lethal voltages!
You can probably make a driver circuit with bipolar transistors. But I'm not going to try to design it... A bipolar transistor turns-on with less than 1V Vbe.
Right, that's the first step. Next one is to make the transistor switch the HV by a certain amount. More information about the 600V source and its load is required. Is there a 605V line available? Or are 595V also sufficient?
that is a crazy scary circuit i think that 00 volts dc is way more dangerous than 00vac you need to be extra carefull not to get yourself killed playing with tat one good luck
600V require quite an airgap - if you have none, things get interesting. Use a suitable optocupler - this is rated for just 600V, but you know where to go from there https://www.vishay.com/docs/83492/vom3052.pdf - if you need or do not need a driver can't be said 'cause there are too few informations given.