Twisted core coupled inductor for the microprocessor VR (2004)
To solve this issue, the twisted core coupled inductor is proposed. The concept is quite simple. Today's coupled inductor uses straight core with winding wrapped around. So, it has a long winding length. Against conventional wisdom, it was proposed to keep the winding straight and wrap the core around it. By doing so, we can get the minimized the winding length and less total loss of the inductor.
The twisted core coupled inductor concept and its implementation is shown in the following figure.