Abstract:
Instability of the input capacitors’ midpoint voltage has been observed to be one of
the major obstacles ofimplementing the peak current mode control in symmetric half
bridge converters. Slight variation of the voltage balance in input capacitors may
cause serious damages to the operation of the half bridge converter leading total
failure ofthe operation ofthe power converter. Some methods have been proposed in
various papers some of them includes major changes in the power stage which
requires specific application oriented design of some of the basic power stage
components (ie: transformer) reducing the availability of components for custom
designs. This analysis proposes simple but reliable solution to the aforesaid matter
without applying any major modification to the power stage of the half bridge
converter circuit and its hardware implementation. This discussion will also extend to
analyze various instability phenomena’s possible in the peak current controlled half
bridge converter applications in power conversion.
