| Abstract |
In this paper, a novel method for control of interleaved converters with variable switching frequency
is presented. It is based on cycle-by-cycle measurements of the switching period and calculation of
the needed phase shift by means of analog circuitry. A control circuit is developed ensuring low phase
error, high bandwidth and high reliability. Simply adding more modules with minimum additional
modifications can easily extend the system's power capability. In case of failure of one or more
modules, the phase shift can be automatically corrected, maintaining minimum ripple amplitude.
Short design considerations are given in order to prevent some possible drawbacks. Finally,
simulation and experimental results are presented for verification. As an application example, a
welding converter based on interleaved modules is presented showing promising results for achieving
a high quality current source. |
