COMMON MODE SUPPRESSION BY DRIVING OPEN-WINDING MOTOR WITH H-BRIDGES AND BIPOLAR MODULATION

摘要

An electrical system (100) includes a converter having an H-bridge (114). The H-bridge (114) includes a first set of transistors (116) electrically connected in series and a second set of transistors (118) electrically connected in series. The first set and the second set of transistors (116, 118) are electrically connected in parallel. The H-bridge (114) defines three available switching states such that a common mode voltage across the H-bridge (114) at each switching state is zero. A method for reducing electromagnetic interference (EMI) in pulse-width modulation (PWM) converters includes diagonally switching transistors of the H-bridge (114). Diagonally switching the transistors of the H-bridge (114) includes constraining available switching states of the H-bridge (114) to only include the switching states with zero common-mode voltage such that common-mode voltage on an AC output side of the H-bridge (114) is zero.