STEVAL-ISV005V2

STEVAL-ISV005V2 240 W photovoltaic battery charger based on the SPV1020 Data brief 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 4-phase interleaved topology of the DC-DC converter renders unnecessary the use of electrolytic capacitors, which would severely limit the lifetime. Description 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 February 2012 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. Doc ID 022746 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 2/4   17   Doc ID 022746 Rev 1 )INPATH 'ROUNDPATH )LOADPATH )LOAD PATH 306 X+ 9EDWW 6CTRL6 6BATT6 & Q) 6OUT?SNS6 6BATT6 5 N 9287B616 5 N 5 0 9B287 / )SNS 9EDWW 6CTRL 5 . 5 N / / &%  - & Q) 6($&9&&FRQWUROOHU   9B287 9EDWW   3=B287   )CTRL & Q) & Q) &% /  N X+ / GQP 5 N 9,1 3=B287 & S) 9287B616 5 2%$,%$ON/UTPUT,IMITAIONIS4RIGGERED ' 5/(' 9UHJ & Q)  & Q) ',$*63,B'$7$B287 & Q) 26&B,1  9B287 X) & X) & 9,1 TO)CTRLPIN3%! 9,1 9UHJ 26&B,1 5 9287B616 3=B287 5 !'.$ / &% 0'.$ / &% 9B287 / 2 SENSE 6 )OUT?MAX 6393662SDFNDJH                   X+ TO)SNSPIN3%!  &% 0'.$ - & Q)  )$6721 6BATT - STEVAL-ISV005V2 circuit schematic +($'(5 / / &%                   / /     6391 Figure 1. (IGH#URRENT0ATH,EGEND  3(5430)?8#3 4%34?$!4!30)?$!4!?). 4%34?#,+30)?#,+ 9&& ',$*63,B'$7$B287 9,1B616 6).?3.3?- X) 9B287 X) / ' )$6721     - 6BATT Circuit schematic 306 . 9,1  & & 9B287 & Q) 5 P2KP 9EDWW ' 6391 1 6).?3.3?-      X+  60%&$ 5 N & S) - / &% ' 9,1B616 5 0 9,1 &% X) 343/,!2+%902/$5#4,EGEND   X) & 17 & X) ' 60%&$ 9&& & X) ' 67368 9B287 & &211)/(; - 9,1 Circuit schematic STEVAL-ISV005V2 !-V STEVAL-ISV005V2 2 Revision history Revision history Table 1. Document revision history Date Revision 03-Feb-2012 1 Changes Initial release. Doc ID 022746 Rev 1 3/4 STEVAL-ISV005V2 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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