AN3971 Datasheet, PDF (1/28 Pages) STMicroelectronics – For photovoltaic standalone installations

AN3971
Application note
STEVAL-ISV005V2: solar battery charger for lead acid batteries
based on the SPV1020 and SEA05
By Giuseppe Rotondo
Introduction
For photovoltaic standalone installations, both battery charging management and an
efficient solar energy harvesting system are required.
The lead acid battery charging control (which is a key feature, in terms of costs, in off-grid
PV installations) must optimize both the charging time and the lifetime of the battery.
To optimize the energy extraction, the solar energy harvesting system needs a power
conversion unit which performs an MPPT (max. power point tracking) algorithm.
The STEVAL-ISV005V2 is a demonstration board for users designing an MPPT-based lead
acid battery charger using the SPV1020, which is a high efficiency, monolithic, step-up
converter, with interleaved topology (IL4) and implementing MPPT.
In addition to the SPV1020, and to prevent battery overvoltage and overcurrent, the
STEVAL-ISV005V2 system architecture proposes a solution with the SEA05 (CC-CV:
constant current-constant voltage) IC.
Figure 1. STEVAL-ISV005V2 demonstration board
May 2012
Doc ID 022119 Rev 2
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