３．Simulation Results
Open-loop and closed-loop control characteristics
of proposed control scheme was estimated
by means of simulation results. In order
to confirm its control characteristics, proposed
DC-DC converter was operated by constant-voltage
control using PI-controller. The converter
output voltage set to 90[V]. As an example,
the obtained waveforms of the converter output
voltage and output current, changing the
load resistance from 20[W] to 95[W], 30[W],
are shown in Fig.3. Fig.3(a) is the waveforms
when the open-loop control and Fig.3(b) is
the waveforms when the closed-loop control.
(a) At the open-loop control
(b) At the closed-loop control
Fig.3. Converter Output Volgate and Output
Current
It can be understood from these figures,
the converter output voltage when the open-loop
control is varied by
changing load resistance, but the converter
output voltage when the closed-loop control
is not varied by one.
Moreover, the converter output voltage is
controlled quickly to the set value.
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