By Dan Lascu, Peter J. Van Duijsen
| EPE-PEMC 2004 - Topic 02-5: Emerging topology | ||
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| | Discontinuous Capacitor Voltage Mode Dc-Dc Converters
By Dan Lascu, Peter J. Van Duijsen | |
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Abstract: The advantages of the hard and soft-switched
converters can be combined using a discontinuous capacitor
voltage mode (DCVM) converter. The main advantages
compared to quasi-resonant converters (QRC) are the limited
and load independent stresses on the semiconductors and
capacitor and the load independent fixed switching frequency,
while keeping the soft-switched character of QRC. The DCVM
for pulse width modulated (PWM) dc-dc converter is investigated
in this paper. A large-signal model for the switching network
operating in DCVM is developed. A hybrid model, valid for both
continuous conduction mode (CCM) and DCVM operation is
also presented and it is shown that this model can be easily used
in power electronics dedicated circuit simulators such as
CASPOC. It is shown that DCVM ÆUK, ZETA and SEPIC
converters are suitable candidates to be used as power factor
pre-regulators. Design guidelines are provided and the main
applications limitations and advantages are revealed.
Simulations and experiments confirm the theoretical predictions.
Measurements on a 18W DCVM PFC converter show a power
factor of 0.998 and a total harmonic distortion of only 5.3%
where the THD of the AC grid already is 3.8%.
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