BACKWARD FLOWING SLOW-START CIRCUIT OF STRING PHOTOVOLTAIC INVERTER

A backfeed soft-start circuit (153) for a photovoltaic inverter is provided. The backfeed soft-start circuit (153) includes a plurality of branch switches (K1, K2, ..., and KN). A solar photovoltaic array includes a plurality of photovoltaic modules (100, 101, ..., and 102), where the plurality of branch switches (K1, K2, ..., and KN) are in a one-to-one correspondence with the plurality of photovoltaic modules (100, 101, ..., and 102), and when the plurality of branch switches (K1, K2, ..., and KN) are turned on, the corresponding photovoltaic modules (100, 101, ..., and 102) are connected to the backfeed soft-start circuit; and a primary switching switch (Kc). One end of each of the branch switches (K1, K2, ..., and KN) is connected to a corresponding photovoltaic module (100, 101, ..., or 102), and the other end is connected to the primary switching switch (Kc). The primary switching switch (Kc) is turned on after the branch switch (K1, K2, ..., or KN) is turned on.