# HVDC - High Voltage DC generation

n my application I've to generate HVDC(~700V) for firing of ultrasonic probes to generate RF signal. Here is the circuit diagram i'm using:

I'm generating two differential square wave(complemented) which will drive N channel MOSFET (RSS100N03) +5V is generated from battery through (LM1117-5 regulator )

EDITS: Further Details:

Square wave is of frequency ~40-50kHz

U22 is NAND gate SN74LV00

1. can someone tell me how HVDC is getting generate here, since as far as I know Transformer works on AC only?

2. What does RSS1000N03 do here?

3. Is there any other concept/circuit to generate HVDC from low DC?

• Do you really have a capacitor of 4.7kF, or am I failing the sight test? Commented Sep 22, 2016 at 8:59
• it's actually 4.7Kpf.. Commented Sep 22, 2016 at 9:06
• @nkg2743: 4.7Kpf means 4.7 kelvin pico something. "k" for kilo, "K" for kelvin, "p" for pico, "F" for farad. Capitals matter. See SI units. Commented Sep 22, 2016 at 9:49
• The square wave IS AC. | What frequency is the square wave. Unless VERY low frequency things need changing. | What part number is U22? | Make R12, R13 VERY low to get max gate drive CURRENT to FETS. - say a few Ohms - maybe 10 Ohms. R14 R15 should not be needed except if U22 is open collector - which it should NOT be. | How did you dimension R25. | How much power do the probes need. Average and peak? | What is spec of TR1 (web link?) turns ratio. How was it chosen? ||There are many ways to make HVDC but what you actually need needs knowing. Commented Sep 22, 2016 at 12:46
• @RussellMcMahon can you provide me few links where I can get more insight about the topic Commented Sep 23, 2016 at 5:30