Method for monitoring a half bridge branch in a half bridge

摘要

The invention relates to a method for monitoring a half bridge branch (38) in a half bridge (32), said half bridge branch (38) being connected in series with another half bridge branch (36) in the half bridge (32) via a center tap (30), including the steps of: —applying an electric supply potential (24) opposite the center tap (30) at the other half bridge branch (36) to the center tap (30) according to a predefined time curve (50); and —monitoring the half bridge branch (38) on the basis of a comparison (70) of the predefined time curve (50) and an electrical output potential (52) at the center tap (30).

主权项

1. A method for monitoring a half bridge branch (38) in a half bridge (32), said half bridge branch being connected in series with another half bridge branch (36) in the half bridge (32) via a center tap (30), a PWM unit (22) which outputs a first control signal (44) to the further half bridge branch (36) of the half bridge (32), and a monitoring device (56) including a first counter (58), a second counter (64), and a timer (60), the method comprising:
applying an electric supply potential (24) opposite the center tap (30) at the other half bridge branch (36) to the center tap (30) according to a predefined time curve (50); counting, by the first counter (58) pulses of an electric output potential (52) at the center tap (30) over a time period (62); counting, by the second counter (64) pulses of the first control signal (44) over the time period (62); and monitoring the half bridge branch (38) on the basis of a comparison (70) of the predefined time curve (50) and the electrical output potential (52) at the center tap (30).