AN3392 datasheet(17/57 Pages) STMICROELECTRONICS

tên linh kiện	AN3392

Giải thích chi tiết về linh kiện	The SPV1020 is a monolithic DC-DC boost converter designed

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AN3392

SPV1020 functions

Doc ID 018749 Rev 1

17/57

Figure 14.

SPV1020 MPPT block

This application is equivalent to matching the impedance of the output load to the

impedance of the input source (PV panel). The value of the impedance (Z) that matches the

impedance of the input source depends on the duty cycle (DC) set by the SPV1020.

Figure 15.

SPV1020 equivalent circuit

Each Z affects the power transfer between the input source and output load, and for each Z

an input voltage (Vin) and current (Iin) can be measured. The purpose of the MPPT

algorithm is to regulate the proper DC in order to guarantee Z = ZM, where ZM is the

impedance of the source and Z is the impedance assuming ZM as the impedance value for

which the power extracted from the supply source (Pin = Vin * Iin) is maximum

(MPP = VMP * IMP).

Figure 16 shows both the typical curves, power vs. voltage and current vs. voltage of a

photovoltaic panel.

MPPT

VREF

PWM

GEN

PV+

PV-

VOUT

AM02601v1

ZDC

SPV1020

Rout

Cin

Iin

Vin

Vout

Panel

gm Vin

Cout

Iout

AM02602v1

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