ST Life.augmented

STEVAL-ISV005V2

240 W photovoltaic battery charger based on the SPV1020
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The STEVAL-ISV005V2 demonstration board is mainly based on the SPV1020 device, a monolithic DC-DC boost converter designed to maximize the power generated by photovoltaic panels independently 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 the PV panels, replacing the bypass diodes. Since the maximum power point is locally computed, the efficiency at system level will be higher than that of conventional topologies, where the MPP is computed in the main centralized inverter.

For a cost-effective application solution and miniaturization requirements, 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 renders unnecessary the use of electrolytic capacitors, which would severely limit the lifetime.

The SPV1020 works at fixed frequency in PWM mode, where the duty cycle is controlled by the embedded logic running a “Perturb & Observe” MPPT algorithm. The switching frequency, internally generated and set by default at 100 kHz, can be tuned externally, while the duty cycle ranges from 5% to 90% with a step of 0.2%.

Safety of the application is guaranteed by stopping the drivers in case of output overvoltage or overtemperature.

The bypass diodes SPV1001N40 guarantee very high application efficiency even when the PV panel voltage is lower than the UVLO threshold of the SPV1020 (6.5 V) and the connection is in series consisting of two or more PV panels.

The SEA05 is connected to the output stage of the application and is used to implement the output current limitation (not available with the SPV1020 alone) through the current sensing resistors R9 and R10.

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Data Brief

Key Features

  • PWM mode DC-DC boost converter
  • Duty cycle controlled by MPPT algorithm with 0.2% accuracy
  • Operating voltage range 0-40 V
  • Overvoltage, overcurrent, overtemperature protections
  • Built in soft-start
  • Up to 98% efficiency
  • Automatic transition to burst mode for improved efficiency at low solar radiation
  • SPI interface
  • Output current limitation
  • RoHS compliant

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Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DB1543: 240 W photovoltaic battery charger based on the SPV1020
1.0 327 KB

Application Notes

Description Version Size
pdf
AN3971: STEVAL-ISV005V2: solar battery charger for lead acid batteries based on the SPV1020 and SEA05
2.0 1,542 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
zip
STEVAL-ISV005V2 gerber files
1.0.0 347 KB

Bill of Materials

Description Version Size
pdf
STEVAL-ISV005V2 BOM
2.0.0 61 KB

Schematic Pack

Description Version Size
pdf
STEVAL-ISV005V2 schematics
1.0.0 69 KB

Sample & Buy

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Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISV005V2ActiveSPV1020Buy Direct77.17Distributor reported inventory date: 2014-09-18
Distributor NameRegionStockMin. order
MOUSEROrder NowWORLDWIDE121
Ecopack2-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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