New interleaved current fed resonant converter with significantly reduced high current side output filter for ev and hev applications

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New Interleaved Current-Fed Resonant
Converter with Significantly Reduced High
Current Side Output Filter for EV and HEV
Applications
Abstract
Introduction:
The phase shift full-bridge (PSFB) converter is widely used
as the dc/dc converter because of its small RMS current and
inherent zero voltage switching (ZVS) characteristic.
Disadvantages of the PSFB converter are that turn-off current of
switches is large and turn-off losses associated with the diode
reverse recovery are considerable. Also, the PSFB converter
requires snubber circuits in the rectifier side to reduce the
voltage spikes generated at turn-off.
In order to reduce the turn-off losses of switches and diodes
resonant converters with ZVS or zero current switching (ZCS)
capabilities, such as SRC and LLC could be considered as
candidates for the LDC. The switching frequency of the resonant
converter can further be increased due to reduced turnoff losses,
which results in reduced size of passive components. In general,
the resonant converter requires output capacitor for suppression
of output ripple voltage, while the PSFB converter requires

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LeMeniz Infotech
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output inductor for suppression of output ripple current. The
volume of the output filter inductor or capacitor is considerable
in the low-voltage high-current application. In order to reduce
the volume of the output filter, interleaved techniques can be
applied to the resonant and PSFB converters.
Existing system:
The two SRC are operated at switching frequency, which is
the same as the resonant frequency and are phase shifted by
π/2.The resonant tank and the load act as a voltage divider, DC
gain is always lower than 1 (maximum gain happens at the
resonant frequency).The impedance of resonant tank can be
changed by varying the frequency of driving voltage
Proposed system:
The proposed converter consists of an input filter inductor,
four switches, a resonant tank, a transformer, a diode rectifier,
and an output filter capacitor. The output voltage of the
proposed converter is regulated by fixed duty and variable
switching frequency. The proposed converter is the current-fed
converter and, therefore, has much smaller input current ripple
compared to the SRC which is the voltage-fed converter. The
voltage and current ratings of switches of the proposed converter
are higher than those of the SRC. The peak value of switch
voltage of the proposed converter is affected by characteristic

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impedance Z and can be limited by choosing proper value of Z.
It should be noted that the ripple current of the resonant
capacitor of the proposed converter is 40% smaller than that of
the SRC, which significantly reduces cost and volume of the
resonant capacitor.
Advantages:
 Theoretically zero output capacitance, resulting in
significantly reduced output capacitor.
 Low input current ripple.
Applications:
 Electric Vehicles (EVs).
 Hybrid Electric Vehicles (HEVs).
 Plug in Hybrid Electric Vehicles (PHEVs).

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Block diagram:
INPUT
DC
supply
Inverter 1
with resonant
circuit
Inverter 2
with resonant
circuit
High
frequency
transformer 1
High
frequency
transformer 2
Rectifier 1
Rectifier 2
Filter
BUFFER
circuit
5VDC
OPTO coupler circuit
PIC controller
circuit
12 V
DC
Load

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LeMeniz Infotech
Call: 0413-4205444, +91 9566355386, 99625 88976.
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.

New interleaved current fed resonant converter with significantly reduced high current side output filter for ev and hev applications

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