ABSTRACT
High voltage gain dc–dc converters are required in many industrial
applications such as photovoltaic and fuel cell energy systems, high-intensity
discharge lamp (HID), dc back-up energy systems, and electric vehicles. This
paper presents a novel input-parallel output-series boost converter with dual
coupled inductors and a voltage multiplier module. On the one hand, the primary
windings of two coupled inductors are connected in parallel to share the input
current and reduce the current ripple at the input. On the other hand, the
proposed converter inherits the merits of interleaved series-connected output
capacitors for high voltage gain, low output voltage ripple, and low switch
voltage stress. Moreover, the secondary sides of two coupled inductors are
connected in series to a regenerative capacitor by a diode for extending the
voltage gain and balancing the primary-parallel currents. In addition, the
active switches are turned on at zero current and the reverse recovery problem
of diodes is alleviated by reasonable leakage inductances of the coupled
inductors. Besides, the energy of leakage inductances can be recycled. A
prototype circuit rated 500-W output power is implemented in the laboratory,
and the experimental results shows satisfactory agreement with the theoretical
analysis.
KEYWORDS
1.
DC–DC converter
2.
Dual coupled
inductors
3.
High gain
4.
Input-parallel
output-series.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT
DIAGRAM:
Fig. 1. Equivalent
circuit of the presented converter.
Fig.2 Key theoretical waveforms.
EXPERIMENTAL
VERIFICATIONS:
Fig.3 Key experimental current waveforms.
Fig.4 Voltage stress waveforms of power components.
CONCLUSION
For low
input-voltage and high step up power conversion, this paper has successfully
developed a high-voltage gain dc–dc converter by input-parallel output-series
and inductor techniques. The key theoretical waveforms, steady-state
operational principle, and the main circuit performance are discussed to
explore the advantages of the proposed converter. Some important
characteristics of the proposed converter are as follows: 1) it can achieve a much
higher voltage gain and avoid operating at extreme duty cycle and numerous turn
ratios; 2) the voltage stresses of the main switches are very low, which are
one fourth of the output voltage under N = 1; 3) the input current can
be automatically shared by each phase and low ripple currents are obtained at
input; 4) the main switches can be turned ON at ZCS so that the main switching
losses are reduced; and 5) the current falling rates of the diodes are
controlled by the leakage inductance so that the diode reverse-recovery problem
is alleviated. At the same time, there is a main disadvantage that the duty
cycle of each switch shall be not less than 50% under the interleaved control
with 180◦ phase
shift.
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