DC/AC converters with high-frequency isolation
and bidirectional power flow are extensively used in
photovoltaic power systems and small isolated power
converters at low and medium power ranges.
The main disadvantages of these circuits are: high
freewheeling loss of the primary leakage current, limited ZVS
range for the lagging leg switches, the effects of the parasitic
elements of the systems and others. To avoid these losses an
energy recovery circuit based on an active voltage clamper is
The control circuit is designed having a number of soft
switching transitions. The system has been verified by
simulation and a prototype is being tested. In this paper we
present an energy recovery system and a modulation sequence
for the cycloconverter. The energy recovery system is based on
an active voltage clamper; the voltage peaks energy is returned
to the source. Furthermore, the presented modulation sequence
is designed to have a maximum number of soft-switching
transitions independent of the electric variables; which means
minimum losses and independence on measurement systems
limitations for modulation.
CitacióRocabert, J. [et al.]. A regenerative active clamp circuit for DC/AC converters with high-frequency isolation in photovoltaic systems. A: IEEE Power Electronics Specialists Conference. "Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual". Aachen: 2004, p. 2082-2088.