bi-directional DC-DC converter

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manishanand14

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Hello Guys

I need a design of bi-directional DC-DC converter.

It will be used to charge the 12V/150Ah Lead Acid batteries from the DC bus [say 300V] and also to discharge from the battery to the bus.[ for an inverter application]
 

You will need two converters; a step-down converter for charging and a step-up converter for discharging, and switches to disconnect the upstream buss and the step-down converter during discharging (and vice versa), unless you always run the downstream buss from battery, in which case you would break the buss between the converters.
 
No, you don't need two converters. Any synchronous converter can be made to run bidirectionally (a synchronous buck converter is literally the exact same circuit as a synchronous boost converter, except the current flow is in the opposite direction). The real trick with bidirectional operation is control, but this is usually taken care of with a MCU.
 
manishanand14 said:
Can you please give the circuit diagram.
Click to expand...
Just google "synchronous buck converter," that's your basic circuit. The selection of power components and controller design will be the real task. I would start with a lower voltage prototype (maybe 48V-12V instead of 300V-12V) just to be safe.
 
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