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AN3392 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN3392
Description  The SPV1020 is a monolithic DC-DC boost converter designed
PDF  57 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3392 Datasheet(HTML) 17 Page - STMicroelectronics

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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
DC
PV+
PV+
PV-
PV-
VOUT
VOUT
AM02601v1
ZDC
SPV1020
Rout
Cin
Iin
Vin
Vout
PV
Panel
gm Vin
Cout
Iout
AM02602v1



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