Absolute Full Wave Inverter

342

04:19:29

Regulated output (green) is realized by boost buck converter. The PWM is generated by triangle wave (orange) and a PWM reference voltage (red) which is the difference between the output and absolute full wave reference voltage (blue).

Needs tuning in feedback system to avoid oscillation on the output voltage and the absolute full wave reference voltage.

published 6 years ago

PrathikP

6 years ago

You forgot to put a freewheeling diode after the pmos in the buck part of the circuit. And nice job by the way

prinzrainer

6 years ago

👍🏻

PrathikP

6 years ago

I noticed that sometimes the buck inductor discharges into the boost capacitor through the buck MOSFET. That needs fixing.

PrathikP

6 years ago

And I think you can increase the buck filter value

PrathikP

6 years ago

See the buck MOSFET is recieving a 0-5V control signal, but the source voltage can go higher than 5V because of the boost stage, and your buck MOSFET is remain permanently on.

prinzrainer

6 years ago

now working even greater thanks, I now drive the pmos using the bucks cap now it doesn't partially on

PrathikP

6 years ago

And i did a bit of googling and confirmed that the buck stage is usually put first, then the boost stage (for the above reason). But using the boost cap is also a good idea.

PrathikP

6 years ago

Usually with such a 2 switch topology, but switches aren't simultaneously switched. When the output voltage has to be lesser than the input, the boost switch is kept permanently off and the buck switch is PWMed, and if a higher output voltage is needed, the buck switch is kept permanently on an the boost switch is PWMed

hurz

6 years ago

check this LTC3111 synchronous buck-boost converter, just an example https://www.analog.com/en/products/ltc3111.html#product-overview they have a good documentation also for four external four mosfets versions, the bridge version. You cant do better here on everycircuit as these little chips 😜

prinzrainer

6 years ago

Yeah ec is a bit crappy, the space is limited and doesn't converge sometimes. But it is also good to have in the pocket.

hurz

6 years ago

Im happy the space is limited, cuz i dont think EC is made for bigger projects. Divide and conquer!

hurz

6 years ago

Or the other way around, see the workspace as limit for complexity to understand. More gets messy

kiani

6 years ago

There is no point in simulating a 64 bit counter a sim,,. Unlrss it is for fabrication,, which one would use ( CADeNCE.?). Which you could simulate a whole micro processor. It is not free and need a sun workstation or better.

hurz

6 years ago

you think sun workstations are still in use?

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