Abstract: Vienna rectifier is a boost-type rectifier with unidirectional energy flow, which is widely used in wind turbine systems, communication power supplies, electric vehicles, etc. In order to reduce switching loss of Vienna rectifier, discontinuous pulse width modulation (DPWM) was usually used. But it would result in DC offset and AC ripple on neutral point voltage. In this paper, to reduce switching loss and control neutral point voltage, a novel carrier-based DPWM (CB_DPWM) method suitable for Vienna rectifiers was proposed by selecting the appropriate clamping mode. To avoid unnecessary switching action during clamping mode switching, an improved pulse sequence was adopted. Switching loss and neutral point voltage ripple of CB_DPWM were compared with the traditional DPWMs. Experimental results show that CB_DPWM has good neutral point voltage control capability and can effectively reduce switching loss.