Multiphase Current Controlled Buck Converter with energy recycling Output Impedance Correction Circuit (OICC)

Resumen

This work is related to the output impedance
improvement of a Multiphase Buck converter with Peak
Current Mode Control (PCMC) by means of introducing
an additional power path that virtually increases the
output capacitance during transients. Various solutions
that can be employed to improve the dynamic behavior of
the converter system exist, but nearly all solutions are
developed for a Single Phase Buck converter with Voltage
Mode Control (VMC), while in the VRM applications,
due to the high currents, the system is usually
implemented as a Multiphase Buck Converter with
Current Mode Control. The Output Impedance
Correction Circuit (OICC) is used to inject or extract a
current n-1 times larger than the output capacitor
current, thus virtually increasing n times the value of the
output capacitance during the transients. Furthermore,
this work extends the OICC concept to a Multiphase Buck
Converter system while comparing proposed solution
with the system that has n times bigger output capacitor.
In addition, the OICC is implemented as a Synchronous
Buck Converter with PCMC, thus reducing its influence
on the system efficiency