Novel high-power-factor ZCS-PWM preregulators
Wakabayashi, F.T.; Bonato, M.J.; Canesin, C.A.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 2, Apr 2001 Page(s):322 - 333
Digital Object Identifier 10.1109/41.915411
Summary:This paper introduces novel zero-current-switching (ZCS)
pulsewidth-modulated (PWM) preregulators based on a new soft-commutation
cell, suitable for insulated gate bipolar transistor applications. The
active switches in these proposed rectifiers turn on in zero current and
turn off in zero current-zero voltage. In addition, the diodes turn on
in zero voltage and their reverse-recovery effects over the active
switches are negligible. Moreover, based on the proposed cell, an entire
family of DC-to-DC ZCS-PWM converters can be generated, providing
conditions to obtain naturally isolated converters, for example, derived
buck-boost, Sepic and Zeta converters. The novel AC-to-DC ZCS-PWM boost
and Zeta preregulators are presented in order to verify the operation of
this soft-commutation cell. In order to minimize the harmonic contents
of the input current, increasing the AC power factor the
average-current-mode control is used, obtaining preregulators with AC
power factor near unity and high efficiency at wide load range. The
principle of operation, theoretical analysis, design example, and
experimental results from test units for the novel preregulators are
presented. The new boost preregulator was designed to nominal values of
1.6 kW output power, 220 Vrms input voltage, 400 Vdc
output voltage, and operating at 20 kHz. The measured efficiency
and power factor of the new ZCS-PWM boost preregulator were 96.7% and
0.99, respectively, with an input current total harmonic distortion
(THD) equal to 3.42% for an input voltage with THD equal to 1.61%, at
rated load
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