Split-pi

Split-pi

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The Split-Pi converter is a type of DC-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is a switch mode power supply with a similar circuit topology to the boost converter and the buck converter. Split-Pi gets its name from the Pi Circuit due to the use of two Pi Filters in series and split with the switching MOSFET bridges.

Principle of operation

In typical operation where a source voltage is located at the left-hand side input terminals, the left-hand bridge operates as a boost converter and the right-hand bridge operates as a buck converter. In regenerative mode, the reverse is true with the left-hand bridge operating as a buck converter and the right as the boost converter.Only one bridge switches at any time to provide voltage conversion, with the unswitched bridge's top switch always switched on. A straight through 1:1 voltage output is acheived with the top switch of each bridge switch on and the bottom switches off. The output voltage is adjustable based on the duty cycle of the switching MOSFET bridge.

Applications

*Electric Drive Train
*Motor Control
*Battery Balancing
*Regenerative Braking

Recognition

Split-Pi UDIO.60.25.L is a product utilising this new power converter topology and has been recogised as innovative new product, being shortlisted for "Power Systems Product of the Year" in the Elektra Awards 2008. Its high efficiency (typically >96%, peak 99%) and bi-directional power control make it a novel technology.

ee also

*Buck Converter
*Boost Converter
*DC-DC converters

References

* British Patent GB2376357B - Power converter and method for power conversion
* [http://www.greenenergytechnologies.eu Green Energy Technologies Ltd] - Split-Pi manufacturer
* [http://www.elektraawards.co.uk/p/1684 Elektra Awards 2008 Shortlist]


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