STEVAL-ISV018V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 300 W PV converter to be integrated into a photovoltaic panel based on SPV1020 and bypass diodes SPV1001N30 and SPV1001N40

STEVAL-ISV018V1
300 W PV converter to be integrated into a photovoltaic panel based
on SPV1020 and bypass diodes SPV1001N30 and SPV1001N40
Data brief
Features
■ PWM mode DC-DC boost converter
■ Duty cycle controlled by MPPT algorithm with
0.2% accuracy
■ Operating input voltage range: 6.5 V to 40 V
■ Operating output voltage: up to 120 V
■ Overvoltage, overcurrent, overtemperature
protection
■ Built in soft-start
■ Up to 98% efficiency
■ Automatic transition to burst mode for
improved efficiency at low solar radiation
■ SPI interface for remote telemetry and control
■ RoHS compliant
Description
The STEVAL-ISV018V1 demonstration board
contains three 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 or in series, despite the
pairs of independent inputs.
The STEVAL-ISV018v1 default setting is output
series connection.
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 an embedded logic which performs
the MPPT (max power point tracking) algorithm
on the PV cells connected to the converter.
One or more converters can be housed in the
connection box of PV panels, replacing the
bypass diodes and, thanks to the fact that 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.
For a cost effective application solution and the
meeting of miniaturization needs, 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 allows the use of electrolytic capacitors
to be avoided, which could severely limit the
lifetime.
It works at fixed frequency in PWM mode, where
the duty cycle is controlled by the embedded logic
running a Perturb and Observe MPPT algorithm.
The switching frequency, internally generated and
set by default at 100 kHz, is externally tunable,
while the duty cycle can range from 5% to 90%
with a step of 0.2%.
Safety of the application is guaranteed by
stopping the drivers in the case of output
overvoltage or overtemperature.
April 2012
Doc ID 023149 Rev 1
For further information contact your local STMicroelectronics sales office.
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