A pwm plus phase shift controlled interleaved isolated boost converter based on semiactive quadrupler rectifier for high step-up applications

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A PWM plus Phase-Shift Controlled
Interleaved Isolated Boost Converter Based
on Semiactive Quadrupler Rectifier for High
Step-Up Applications
Introduction:
Power systems sourced by renewable energy sources and batteries
have been becoming the effective solutions to compensate the global
energy shortage and environmental problems. Commonly the two-stage
configuration constructed by a front-end dc–dc converter and a grid-
connected inverter is widely used, due to the low output voltages of
these renewable energy sources and batteries. Hence, the high step-up
voltage-conversion ratio is required for the dc–dc stage to convert the
low voltages into a sufficiently high voltage for the inverter. Meanwhile,
the galvanic isolation is expected to be implemented in the dc–dc stage
rather than in the inverter stage to reduce the size of the isolation
transformer and to increase the overall system efficiency [6]. Besides,
the low-voltage stresses on power devices are desired not only for cost
reduction but also for efficiency improvement by using the low-voltage
rating devices with better conduction/switching performance.
Existing system:
DAB converter is a preferred option, as it has a small component
count, offers isolation, and allows for high power operation. In addition,

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it has the ability to accommodate a wide range of voltage levels, as it
may be controlled to operate in buck or boost modes.
Drawbacks:
 Single phase-shift (SPS) control draws a large reactive current
component at low operating power levels, which increases the
converter conduction losses.
 It needs larger dc-link capacitor
 switching losses is high
 Conduction loss is high
 Magnitude of bridge current is high
Proposed system:
Semiactive quadrupler rectifiers (SAQRs) are proposed to serve as
the secondary rectification circuits, which make the secondary-side
voltages to be controllable and help reduce current stress and conduction

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losses. An interleaved isolated boost converter is developed based on the
proposed SAQRs. By utilizing the pulse-width modulation (PWM) plus
phase-shift (PPS) control strategy, the primary- and secondary-side
voltages are well matched to reduce the current values and circulating
conduction losses. With the proposed SAQRs, the voltage gain is
extended and the voltage stresses on power devices and passive
components used in rectification circuits are reduced to the half of the
high output voltage. Hence, the efficiency is improved by using a
transformer with a smaller turn’s ratio and reduced parasitic parameters,
and by employing low-voltage rating devices with better switching and
conduction performance. With optimal design, lower voltage, and
current stresses on the primary-side switches, minimized input current
ripple can be realized. Moreover, the zero-voltage turn on switching of
the active switches and the zero-current turn off switching of the diodes
can be achieved over a wide load and voltage range by the proposed
SAQR-based converter and the control strategy.
Advantages:

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 The voltage stresses on the components in SAQRs are reduced to
half of the output voltage which extends the voltage conversion
ratio.
 Low-voltage rating switching devices with better conduction and
switching performance have been used to improve efficiency.
Moreover, the ZVS turn on of the active switches and the ZCS turn
off have been achieved by the proposed PWM PPS modulation.
 Low-voltage stresses on the primary-side switches together with
the reduced input current ripple and peak/rms values have been
obtained to improve the conversion efficiency.
Applications:
 High step-up applications.

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Block diagram:
Semi Active
Quadrupler
Micro Controller
Circuit
Buffer Circuit
5V DC
Interleaved boost
Converter
Input DC
Supply
Isolation
Transformer
Driver Circuit
12V DC
Output
Filters
Load
Isolation Circuit

A pwm plus phase shift controlled interleaved isolated boost converter based on semiactive quadrupler rectifier for high step-up applications

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A pwm plus phase shift controlled interleaved isolated boost converter based on semiactive quadrupler rectifier for high step-up applications