A boost converter utilizing bi-directional magnetic energy transfer of
coupling inductor provides a high efficiency boost DC-DC converting with
above 30 times voltage boost rate, which uses a coupling inductor and low
voltage switch to absorb circuit induction voltage of a passive
regenerative snubber no matter if switch is turned on or off. Such that,
a much higher voltage boost rate than the turn rate of transformer and
wider range of switching duty cycle is obtained. A bi-directional
magnetic energy path is utilized, that is, when switch is turned on the
first winding of coupling inductor stores magnetic excited high current
energy, and opposite magnetic flux is induced on the second winding at
the same time. When switch is turned off the magnetic excited current
continues and increases the voltage on the second winding. The second
winding has bi-directional magnetic current induced and fully utilizes
capacity of transformer's iron core.