STEVAL-ISV008V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 300 W PV converter demonstration board to be integrated into a photovoltaic panel based on the SPV1020

STEVAL-ISV008V1
300 W PV converter demonstration board to be integrated
into a photovoltaic panel based on the SPV1020
Data brief
Features
■ PWM mode DC-DC boost converter
■ Duty cycle controlled by MPPT algorithm with
0.2% accuracy
■ Operating voltage range 0-40 V
■ Overvoltage, overcurrent, overtemperature
protections
■ Built in soft-start
■ Up to 98% efficiency
■ Automatic transition to burst mode for
improved efficiency at low solar radiation
■ SPI interface
■ RoHS compliant
Description
The STEVAL-ISV008V1 demonstration board
contains 3 SPV1020s in the same PCB and is
suitable for distributed PV panels with 3 isolated
strings. The outputs of the SPV1020s can be
connected in parallel (STEVAL-ISV008v1 default
setting) or in series, despite the pairs of
independent inputs. For the STEVAL-ISV008v1
only the output parallel connection is allowed.
The SPV1020 is a monolithic DC-DC boost
converter designed to maximize the power
generated by photovoltaic panels independent of
temperature and amount of solar radiation.
The optimization of the power conversion is
obtained with embedded logic which performs the
MPPT (maximum power point tracking) algorithm
on the PV cells connected to the converter.
One or more converters can be housed in the
connection box of the PV panels, replacing the
bypass diodes and, because the maximum power
point is locally computed, the efficiency at system
level is higher than that of conventional
topologies, where the MPP is computed in the
main centralized inverter.
STEVAL-ISV008V1
For a cost effective application solution and
miniaturized system, the SPV1020 embeds the
Power MOSFETs for active switches and
synchronous rectification, minimizing the number
of external devices. Furthermore, the 4-phase
interleaved topology of the DC-DC converter
avoids the use of electrolytic capacitors, which
would severely limit the lifetime.
The SPV1020 operates at fixed frequency in
PWM mode, where the duty cycle is controlled by
the embedded logic running a Perturb&Observe
MPPT algorithm. The switching frequency,
internally generated and set by default at 100
kHz, is externally adjustable. The duty cycle can
range from 5% to 90% with a resolution of 0.2%.
Safety of the application is guaranteed by
stopping the drivers in the case of output
overvoltage or overtemperature.
November 2011
Doc ID 018826 Rev 2
For further information contact your local STMicroelectronics sales office.
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