C.2I_d/3                                                       D.I_d

9. 单相全控桥式有源逆变电路最小逆变角β为 (        )

A. １°～３°                                            B. １０°～１５°

C. ２０°～２５°                                     D. ３０°～３５°

10. 三相全控制桥式有源逆变电路，在交流电源一个周期里，输出电压脉动 __________ 次。 (        )

A.2                                                            B.3

C.4                                                            D.6

11. 有源逆变电路是 (        )

A.AC/DC 变换器                                        B.DC/AC 变换器

C.AC/AC 变换器                                        D.DC/DC 变换器

12.PWM 脉宽调制技术用于