Bidirectional Buck Boost Converter Topologies

Hi, What have you done so far? And what are the results? It sounds as if you want others to do your research job. Klaus I'm doing a lot of analysis here, trying out different configurations. Calculations are massive. Issues here are that the magnetic core is supposed to be very light, probably less than 5g and this means a very small window area.

At the end the inductor is copper loss limited. I've gone past that point though so I came up with an optimum frequency around 1.5MHz giving me a winding resistance lower than 1ohm. So I now have to tackle switching losses. I'm practically leaving out the use of diodes to reduce switching losses and to ensure CCM so I'm going to use synchronous switching.

The buck–boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a flyback converter using a single inductor instead of a transformer. This paper proposes the bidirectional DC-DC converter which employs the two bridge configuration resonant class-E converters. Inverter at a low voltage side and a voltage-fed (buck) in. The proposed converter topology is shown in Fig.

I have also looked up some topologies on the internet but the switching frequencies are quite low for this efficiency spec considering switching losses at 1.5MHz. The highest I found was about 1MHz but output power was way higher than 65+-5W indicating a possibility.

While I'm doing some more work here, I'd like some help. I said that a long list would be preferred. All I meant was that I need as much contributions as I can get. Hi, Please what are the practical bidirectional topologies for non-isolated buck-boost converters for efficiencies above 95% at 1.5MHz switching frequency and output power above 65W?

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A long list would be appreciated. To be clear, a 'topology' is the general converter circuit, which you've apparently already settled on (buck-boost). Sounds like you're looking for help with specific component selection, though without knowing the I/O voltage ranges it's impossible to start. Also the fact that you're aiming at such a high frequency suggests you're going for something very compact/lightweight at the expense of slightly less efficiency. To be clear, a 'topology' is the general converter circuit, which you've apparently already settled on (buck-boost). Sounds like you're looking for help with specific component selection, though without knowing the I/O voltage ranges it's impossible to start.

Also the fact that you're aiming at such a high frequency suggests you're going for something very compact/lightweight at the expense of slightly less efficiency. At first I was stuck in determining an arrangement that would be able to do the bidirectional requirement. I've been able to figure out an arrangement that I'm still trying out. The I/O voltage ranges from 0 to 5V. When I calculated for the winding resistance of the inductor, I got a value a little below 0.8ohm.