| Abstract |
In this paper, a digital resistive current (DRC)
control for parallel interleaved DC-DC converters is
proposed. Converting the effective input characteristic of
the converters seen by the source as a resistive load sink for
current sharing, the proposed control scheme achieves
current mode control, like the conventional analog charge
current mode control. Also, the sub-harmonic oscillation at
the light load is defined and the method to avoid this
problem is presented. Thus, using this control method, it is
possible to use the converters operated in continuous
conduction mode (CCM) and discontinuous conduction
mode (DCM). The complete small signal model with the
digital sampling effect is developed to perform the stability
analysis and the design guideline. For the design example,
two 100W parallel module buck converters with a
TMS320F2812 DSP has been built and tested by using the
proposed DCR control. |
