hoe to draw bidirectional dc dc converter for dc nano grid in ltspice

ide

out.

Bi-directional DC-to-DC converters are tricky. You could use a Royer invert er to generate an alternating square wave, put it through a transformer to step the voltage up or down, and use active rectification to turn the AC em erging from the other side of the transformer back into a different DC volt age.

Square waves are a bit brutal. Baxandall inverters generate sine waves (alb eit with some harmonic content) which can be easier to handle.

Baxandall wrote that in 1959, before MOSFETs had been invented. His circuit tends to work better with MOSFET switches, though driving them can be tric ky.

The inverter to active rectifier route is potentially reversible, and you c an represent and simulate that kind of circuit in LTSpice. Matlab isn't des igned for that.

The way the question is posed suggests that you haven't got a clue what you are talking about.

A longer post, telling us what you want to do and why you want to do it, mi ght get more helpful responses. It might also generate hurtful comments abo ut dumb newbies, but there's no gain without some risk of pain.

Start by defining your requirements, then pick your topology.

NT

Do you mean that energy can flow in both directions?

Fully synchronous buck or boost converters are bi-directional. Current flows to maintain an in/out voltage ratio, set by the duty cycle of the two switch system. (Synchronous converters use switches instead of diodes.) For example, you can equalize the charge state between a 12V and a 42V battery. I like to call them bus converters. The nano-grid concept appears to be house-wide systems replacing the traditional AC power lines. They assume energy sources in your home. I have 8.5kW solar- panel on my roof to feed my house-hold use, with the extra going to the grid. But it works using conventional AC lines.

It would help to know the voltages and currents involved on each side. Is it to step up, step down, invert polarity etc.

piglet

What page is that on? :)

It's in the even-more extended edition, which hasn't been published yet (and probably never will be) and - for the moment - only exists in the minds of people who know something about electronic design (which excludes Tom Del Rosso).

You forgot the smiley. There are also people who have been regular posters and have passed away and are missed (which will exclude you when you croak because you won't be missed at all).

kf him. The S/N ratio is about 1000:1.

NT

A smiley doesn't make a lame attempt at a joke any less lame.

I might be missed by people who do know something about electronics, which does exclude Tom Del Rosso. I'd kill-file him, if he wasn't such a seductive target for supercilious observations.

NT has the same problem as Tom Del Rosso - you have to be able to process the signal before you can distinguish it from noise.

I don't even mind the noise, but he's gotten nastier lately so I just did that.

Tom Del Rosso has gotten more fatuous lately, but he won't be aware of that.

One guy I really miss is Virg Wall. Rich Grise dropped off the grid awhile back too--he was sometimes fun, and certainly added to the local colour. Who else?

Cheers

Phil Hobbs

I could say a thing or 2 about him, but really it's not worth the time. Life is short.

NT

Rich came back after a few years away, to my surprise. I thought the worst. Maybe he'll rise again.

Then there was Danger Dave who apparently knew he was dying, and didn't say so AFAIK, but he did post a witty short story told first-person "from death row" on his last April Fools Day.

And NT's cognitive resources are pretty thinly spread. So much to be gullible about and so few opportunities to demonstrate that gullibility.

What was DangerDave's real name?

No idea. At least we know his first name. It would be worse if it was just a nym, but it seems we never get to know any of the anonymous posters personally.