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AN3392 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN3392 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 57 page  May 2012 Doc ID 018749 Rev 1 1/57 AN3392 Application note Designing with the SPV1020, an interleaved boost converter with MPPT algorithm By Domenico Ragonese, Massimiliano Ragusa Introduction The SPV1020 is a monolithic DC-DC boost converter designed to maximize the power generated by photovoltaic panels independent of temperature and the 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 junction box of PV panels, replacing the bypass diodes. Because of the fact that the maximum power point is locally computed, the efficiency at system level is higher compared to the use of conventional topologies, where the MPPT is computed in the main centralized inverter. For a cost effective application and miniaturized solution, the SPV1020 embeds the Power MOSFETs for active switching 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 can severely limit the system lifetime. The SPV1020 operates at fixed frequency in PWM mode, where the duty cycle is controlled by embedded logic running a Perturb&Observe MPPT algorithm. The switching frequency, internally generated and set by default at 100 kHz, is externally adjustable, while the duty cycle can range from 5% to 90% in steps of 0.2%. Safety of the application is guaranteed by stopping the drivers in the case of output overvoltage or overtemperature. Figure 1. STEVAL-ISV009V1 demonstration board www.st.com |
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