SEMIKRON SKiiP 4 - Solar Function Operation Mode

To Next Page

To Previous Page

Page 59/73

7.8 Solar function

For an operation of the SKiiP

4 during the startup phase typically in PV-solar applications, a higher DC-link

voltage trip level must be available for low load currents in contrast to standard applications. A special

modification of the current SKiiP

4 1700V type has been carried out to fulfill this specific requirement of

the PV-solar market.

Please note: The solar function cannot be activated through CAN and, hence, a dedicated SKiiP

4 for

such PV-solar specific operation must be ordered.

The Safe Operating Area (SOA) diagram of the PV SKiiP

4 is indicated in the Figure 7.13. While the SOA

for the standard SKiiP

4 (shown in the Figure 7.1) is limited by the over voltage trip level V

DCtrip

and over

current trip level I

TRIPSC

, the modified SOA of the PV SKiiP

4 employs an extended area above V

DCtrip

and

limited by the low load current I

and a higher over voltage trip level V

DCtripLL

. This operation mode is called

“solar mode” and is marked orange in the right diagram of Figure 7.13. Parameters I

and V

DCtripLL

are

given in the data sheets SKiiP

4 Solar. The operation at DC-link voltages higher than the recommended

voltage levels and especially in this “solar mode” extended SOA is very time limited since the probability of

a cosmic ray induced fault increases exponentially under such conditions.

Figure 7.13: SOA for SKiiP

4 Solar

The operation modes for SKiiP

4 solar are listed in the Table 7—2.