Dc Switch; Circuit Diagram - Sungrow SG33CX User Manual

2 Product Introduction

2.2.5 DC Switch

The DC switch is used to disconnect the DC current safely whenever
necessary.
The SG33CX is equipped with one DC switch to control the connection and
disconnection of all DC terminals.
The SG40CX and SG50CX are equipped with two DC switches separately
controlling a group of DC inputs. The correspondence is as follows:
(SG50CX)

2.3 Circuit Diagram

The MPPT is utilized for DC input to ensure the maximum power from the PV
array at different PV input conditions. The inversion circuit converts the DC
power into AC power and feeds the AC power into the utility grid through the AC
terminal. The protection circuit is equipped to ensure the safe operation of the
device and personal safety.
Fig. 2-3 shows the main circuit of the inverter.
DC1
DC n
DC switch
Current
Monitoring
*SG33/40/50CX: n= 3/4/5
8
MPPT
( )
Boost 1
DC EMI
Filter
MPPT
)
(
Boost 2
DC SPD
Fig. 2-3 Circuit diagram
AC
Filter
DC Bus
Inverter Circuit
(DC/AC)
User Manual
(SG40CX)
AC EMI
AC
Filter
Relays
AC SPD
L1
L2
L3
N
PE