AN3392 datasheet(45/57 Pages) STMICROELECTRONICS

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AN3392

SPV1020 parallel and series connection

Doc ID 018749 Rev 1

45/57

In the case where the irradiation is the same for each panel:

Equation 40

Equation 41

Equation 42

Equation 43

so,

Equation 44

For example, assuming Pout = 90 W and, if desired VOUT = 90 V, then Voutx = 30 V.

Lower irradiation for one panel, for example on panel 2, causes lower output power, so lower

Vout2 due to the Iout constraint:

Equation 45

The output voltage (VOUT) required by the load can be supplied by the 1

st and 3rd SPV1020

but only up to the limit imposed by their R3/R4 partitioning.

Some examples can help to understand the various scenarios assuming the following

conditions: R3/R4 limiting Voutx = 40 V and desired VOUT = 90 V.

Example 1:

Panel 2 has 75% of the irradiation that panels 1 and 3 have:

Pin1

Pin2

Pin3

Pout

Poutx x

1..3

[]

⋅

Poutx

---Pout

Poutx

Voutx

Ioutx

Voutx

Iout

⋅

Voutx

---Vout

Voutx

Poutx

Iout

----------------

Vout2

---

Vout1

---

Vout3

⋅

Pout1

Pout2

Pout3

Pout2

---Pin1

22.5W

Pout

Pout1

Pout2

Pout3

82.5W

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