Snubber-circuit for internal switches of neutral-point-clamped three-level inverter

摘要

An inverter (110) may include an inversion unit for converting a direct current bus voltage into an alternating current voltage, a first snubber unit (120), and a second snubber unit (130). The inversion unit may include a first external switch (111), a first internal switch (112), a second internal switch (113), and a second external switch (114) which are connected in series in order between a direct current bus positive voltage terminal (Bus+) and a direct current bus negative voltage terminal (Bus-). The first snubber unit (120) may be connected between the direct current bus negative voltage terminal (Bus-) and the first internal switch (112) for suppressing voltage stress of the first internal switch (112). The second snubber unit (130) may be connected between the direct current bus positive voltage terminal (Bus+) and the second internal switch (113) for suppressing voltage stress of the second internal switch (113).