Coupled inductor output filter
View Patent ↗The present invention is directed to a coupled inductor output filter to be used with DC/DC switched mode power supply topologies. This new output filter changes the inherent power sharing capability of most DC/DC converter topologies, enabling the overall converter to operate as a truly modular block with no inter-module communication required to accomplish power/current sharing on a multi-module configuration. The coupled-inductor output filter uses a split inductor, Lout 1 and Lout 2 , a main output capacitor, Cout, and a DC blocking capacitor, CDC Block.
1. A coupled inductor output filter for one or more DC/DC switched mode power supplies with a power output for powering a load with a first load end and a second load end, the filter comprising:
a coupled inductor including a first inductor coupled to a second inductor;
the first inductor connected between the power output and the load;
a first capacitor connected in parallel with the load;
the second inductor connected in series with a second capacitor to form an inductor capacitor series; and
the inductor capacitor series connected in parallel with the load.
2. A method of filtering load power requirements for a load supplied by at least one DC power supply, the method comprising:
providing a coupled inductor including a first inductor and a second inductor;
connecting the first inductor in series with the load;
using the second inductor in series with a capacitor to form a high pass filter; and
connecting the high pass filter in parallel with the load such that the coupling of the inductors causes the first inductor to operate in a discontinuous mode.