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ZVS-ZCS High Voltage Gain Integrated Boost
Converter For DC Microgrid
Abstract:
A non-isolated soft switched integrated boost
converter having high voltage gain is proposed for the
module integrated PV systems, fuel cells and other low
voltage energy sources. Here a bidirectional boost converter
is integrated with a resonant voltage quadrupler cell
to obtain higher voltage gain. The auxiliary switch of the
converter, which is connected to the output port acts as
an active clamp circuit. Hence ZVS (zero voltage switching)
turn on of the MOSFET switches are achieved. Coupled
inductor’s leakage energy is recycled to the output port
through this auxiliary switch. In the proposed converter,
all the diodes of the quadrupler cell are turned off with
ZCS (zero current switching). This considerably reduces
the high frequency turn off losses and reverse recovery
losses of the diodes. ZCS turn off of the diodes also remove
the diode voltage ringing caused due to the interaction of
the parasitic capacitance of the diodes and the leakage
inductance of the coupled inductor. Hence to protect the
diodes from the voltage spikes, snubbers are not required.
The voltage stress on all the MOSFETs and diodes are
lower. This helps to choose switches of low voltage rating
(low RDS(ON)) and thus improve the efficiency. Design and
mathematical analysis of the proposed converter are made.
A 250W prototype of the converter is built to verify the
performance.
Existing system:
 In a conventional boost converter obtaining a high voltage gain is limited by
the poor efficiency operation caused due to the conduction losses and diodes
reverse recovery losses.
 Among the various non-isolated high gain dc-dc converters, coupled
inductor based converters are attractive due to the freedom of increasing the
voltage conversion gain by simply changing the turn’s ratio.
Proposed system:
 In the proposed system, a non-isolated, soft switched integrated boost
converter is proposed for dc microgrid. A resonant voltage quadrupler cell is
integrated at the secondary terminals of the coupled inductor to obtain high
voltage gain.
 The energy of the coupled inductor is transferred to the voltage multiplier
cell during all the switching state of the MOSFET switch. Hence instead of a
large magnetic core, a small sized core can be utilized to construct the
coupled inductor.
 Thus overall power density of the converter is improved. Coupled inductor’s
leakage energy is recycled to the output port by utilizing the boost
integration technique.
Circuit diagram:
Applications:
Applications like regulated power supply, output voltage is regulated by voltage
mode or current mode control.
Reference:
[1] J. M. Carrasco, L. G. Franquelo, J. T. Bialasiewicz, E. Galv´an, R. C. P.
Guisado, M. A´ . M. Prats, J. I. Leo´n, and N. Moreno-Alfonso, “Powerelectronic
systems for the grid integration of renewable energy sources:
A survey,” IEEE Trans. Ind. Electron., vol. 53, no. 4, pp. 1002–1016,
Jun. 2006.
[2] K. Sun, L. Zhang, Y. Xing, and J. M. Guerrero, “A distributed control
strategy based on dc bus signaling for modular photovoltaic generation
systems with battery energy storage,” IEEE Trans. Power Electron.,
vol. 26, no. 10, pp. 3032–3045, Oct. 2011.
[3] S. Sathyan, H. M. Suryawanshi, M. S. Ballal, and A. B. Shitole, “Softswitching
dc-dc converter for distributed energy sources with high stepup
voltage capability,” IEEE Trans. Ind. Electron., vol. 62, no. 11, pp.
7039–7050, Nov. 2015.