Bi-Toroid Transformer Technology (BiTT) Principle of Operation
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The Bi-Toroid Transformer (BiTT) uses a novel design that improves upon conventional transformers. It places the primary coil in the center of a three-phase transformer, with the two secondaries on either side. An outer toroid connects the secondaries but isolates them from the primary. This allows energy transfer from primary to secondaries in one direction only, like a magnetic diode. With resistive loads, the BiTT primary power factor and current do not change from no-load to on-load conditions. This increased efficiency can lower power losses by 30% or more. Potential applications include battery chargers and electric vehicles.
Bi-Toroid Transformer Technology (BiTT) Principle of Operation
- 1. Bi-Toroid Transformer (BiTT) "Magnetic flux always follows the path of least resistance" PDI took a three phase transformer and placed the primary in the centre with the two secondaries at each side. Then added an outer toroid which connected the two secondaries to each other but bi-passed the primary. Now the primary delivers flux to both the secondaries but the secondary induced BEMF flux cannot couple back to the primary. Instead the secondary induced flux follows the lower reluctance flux path route and couples to the other adjacent secondary while providing the flux required to maintain the voltage across the load. The Bi-Toroid Transformer (BiTT) operates as a Magnetic Diode, consumes almost pure reactive power but delivers real power to the loads and only allows the transfer of energy in one direction. Because the BiTT primary is isolated from the secondary on-load induced flux, the BiTT primary power factor and current do not change from no-load to on-load. With a purely resistive load on the BiTT the primary power factor is virtually zero and the efficiency of the energy transfer is increased accordingly. If for example, the transformer primary power factor is reduced by 30% the transformer efficiency is also increased by 30%. This transformer can also be applied in chargers and in electric vehicles between the generator and the batteries and between the batteries and the motor. Figure1 Conventional Three Phase Transformer Figure 2 Bi-Toroid Transformer Inner three legged transformer with outer secondary Toroid flux path route which isolates primary from secondary BEMF induced flux.