Patent ID: 9685883
Date: 2017-06-20
CPC Classifications: H02M

Claim:
1. A three-level rectifier comprising at least one phase bridge arm, and the at least one phase bridge arm comprising: an upper-half bridge arm circuit module comprising a first power semiconductor transistor unit, a first diode unit without connecting any switch in parallel, a second diode unit without connecting any switch in parallel, a first connecting busbar, a first insulated wire and a first transfer busbar, the first diode unit connected to the second diode unit in series, the first diode unit connected to a positive terminal of a direct-current bus, the first connecting busbar connected to the first power semiconductor transistor unit and the first diode unit, the first transfer busbar connected to the second diode unit, and the first insulated wire connected to the first transfer busbar and the first connecting busbar; and a lower-half bridge arm circuit module comprising a second power semiconductor transistor unit, a third diode unit without connecting any switch in parallel, a fourth diode unit without connecting any switch in parallel, a second connecting busbar, a second insulated wire and a second transfer busbar, the third diode unit connected to the fourth diode unit in series, the first power semiconductor transistor unit and the second power semiconductor transistor unit both connected to a neutral point of a capacitor unit, the second diode unit and the third diode unit connected to an alternating-current terminal, the fourth diode unit connected to a negative terminal of the direct-current bus, the capacitor unit connected between the positive terminal of the direct-current bus and the negative terminal of the direct-current bus, the second connecting busbar connected to the second power semiconductor transistor unit and the fourth diode unit, the second transfer busbar connected to the third diode unit, the second insulated wire connected to the second connecting busbar and the second transfer busbar, and the upper-half bridge arm circuit module and the lower-half bridge arm circuit module disposed side by side and facing each other.