COMPARATIVE ASSESSMENTS OF CONTINUOUS AND SELF-DRIVEN PWM FOR HIGH FREQUENCY CONVERTER DESIGN

In this project the comparison of the continuous gate drivers and self
driven gate drivers' characteristics, performance, operation modes, advantages,
and disadvantages are analyzed and observed. Both of the gate drivers will be
applied at synchronous buck converter, SBC as the output circuit and also with
switching frequency of 1 MHz. PSPICE software is used in designing and
simulating the respective circuit. The comparison is carried out based on the
output voltage, current, node voltage, output ripple voltage and current, gate-tosource
voltage, and body diode conduction loss of the continuous and self-driven
gate drivers. Type III compensator and AGD are applied to both switches in the
SBC circuit. At the end of the simulation, adding AGD to the SBC reduces the
dead time, body diode conduction and also cross-conduction losses in DCM. SBC
shows an improvement up to 9.70% and 9.78 %on output voltage, current and
also has virtually zero on the body diode conduction losses when both
compensator and AGD are applied. For CCM and DCM, it is observed that SBC
with COD, AGD and compensator-AGO produce high output current in CCM
compared to DCM. COD with SBC, the output current in CCM improves 12.22 %
compared to DCM. Besides, AGD with SBC is the least preferable circuit
compared to compensator-AGO, MPPT-Vpulse, parallelism, and COD because of
the lower output voltage and current produced, higher output ripple for voltage
and current, and higher body diode conduction loss in the SBC. Here the output
voltage and current is reduced to 15.30 % and 15.21 % respectively as it is
compared to MPPT-Vpulse·