SPV1040 parallel and series connection

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Appendix A

SPV1040 parallel and series connection

Output pins of many SPV1040s can be connected either in parallel or in series. In both

cases the output power (Pout) depends on light irradiation of each panel, on application

efficiency, and on the specific constraints of the selected topology.

The objective of this section is to explain how the output power is impacted by the selected

topology.

An example with 3 PV panels (panel1, panel2, panel3) is presented, but the conclusion can

be extended to a larger number of PV panels.

If the panel is lighted and the SPV1040 is on (it means that light irradiation intensity is such

that V

MPP-SET

≥ 0.3 V):

If the panel is completely shaded: P

OUTx

=0

SPV1040 parallel connection

This topology guarantees the desired output voltage even when only one panel is irradiated.

The obvious constraint of this topology is that V

OUT

is limited to the SPV1040 maximum

output voltage.

Figure 15 shows the parallel connection topology:

Figure 15. SPV1040 output parallel connection

The output partitioning (R

1

/R

2

) of each SPV1040 must be coherent with the desired V

OUTX

.

According to the topology:

V

OUT

=V

OUT1

=V

OUT2

=V

OUT3

I

OUT

=I

OUT1

+I

OUT2

+I

OUT3

]

3

..

1

x

[

=

P

OU T x

ηP

IN x

=

AM06711v1

PV3

SPV1040

Vo3+

Vo3-

PV3+

PV3-

PV2

SPV1040

Vo2+

PV2+

PV2

PV1

Vo2-

PV2-

SPV1040

Vo1+

PV1+

SPV1040

Vo1-

PV1-

OUT+

V

OUT-

V