DocID18265 Rev 8

21/25

AN3319

SPV1040 parallel and series connection

According to the light irradiation on each panel and to the system efficiency (

η), the output

power results:

Therefore:

Each SPV1040 contributes to the output power providing I

OUTX

.

Finally, the desired V

OUT

is guaranteed if at least one of the 3 PV panels provides enough

power to turn-on the SPV1040 relating to it.

SPV1040 series connection

This topology provides an output voltage that is the sum of the output voltages of the

SPV1040 connected in series. The objective of this section is to explain how the output

power is impacted by the selected topology.

Figure 16 shows the series connection topology:

Figure 16. SPV1040 output series connection

In this case, the topology imposes:

In case irradiation is the same for each panel:

]

3

..

1

x

[

=

]

3

..

1

x

[

=

3

OUT

2

OUT

1

OUT

OUT

P

P

P

P

+

+

=

OUTx

OUTx

OUTx

I

*

V

P

=

INx

INx

INx

I

*

V

P

=

3

IN

2

IN

1

IN

3

OUT

2

OUT

1

OUT

OUT

OUT

P

P

P

)

I

I

I

(

V

P

η

+

η

+

η

=

+

+

=

AM06710v1

PV3

SPV1040

Vo3+

Vo3-

PV3+

PV3-

PV2

SPV1040

Vo2+

PV2+

PV2

PV1

Vo2-

PV2-

SPV1040

Vo1+

PV1+

SPV1040

Vo1-

PV1-

OUT+

V

OUT-

V

3

OUT

2

OUT

1

OUT

OUT

I

I

I

I

=

=

=

3

OUT

2

OUT

1

OUT

OUT

V

V

V

V

+

+

=

]

3

..

1

x

[

=

3

OUT

2

OUT

1

OUT

P

P

P

=

=

OUTx

OUT

P

*

3

P

=

OU T

OUTx

P

3

1

P

=

OUT

1

OUT

OUTx

OUTx

OUTx

I

*

V

I

*

V

P

=

=