三电平Boost变换器升压电感的选值方法

发布时间：2015年11月02日 分类：科技成果

摘要

本发明属于直流变换器设计领域，涉及一种三电平Boost变换器升压电感的选值方法，包括如下步骤：确定三电平Boost变换器的预期工作模式，为连续导电模式还是不连续导电模式，若为连续导电模式，则确定工作模式是电感独立供能模式还是电感-电容供能模式，给出计算不连续导电模式和连续导电模式的临界电感值的公式和计算电感独立供能模式与电感-电容供能模式间的临界电感的公式；根据临界电感公式、变换器的工作模式及相关参数确定升压电感取值。根据本发明给出的方法，可合理地选取升压电感的感值，从而有效地避免由于电感过小无法满足变换器设计要求或电感过大造成的材料浪费。

主权项

一种三电平Boost变换器升压电感的选值方法，包括如下步骤：(1)确定三电平Boost变换器的预期工作模式，为连续导电模式还是不连续导电模式，若为连续导电模式，则确定工作模式是电感独立供能模式还是电感-电容供能模式；设变换器的开关信号间的相差为θ，升压比为d，输出电压为Vo，等效输出电流为Io，开关周期为Ts，则计算不连续导电模式和连续导电模式的临界电感值的公式如下：                                    L                        C             1                             =                                                V               o                                         T               s                                                4                            π                2                                         I               o                                          d                    (           1            -           d           )                             (                        1             2                      -           d            )                  [                    θ           2                  +                                 (             2             π             -             θ             )                      2                  ]                       d         <         0.5                                            L                        C             2                             =                                                 V               o                                         T               s                                                4                            π               2                                         I               o                                                                  (             1             -             d             )                      2                             (           d           -                        1             2                      )                  [                    θ           2                  +                                  (             2             π             -             θ             )                      2                  ]                       d         >         0.5                计算电感独立供能模式与电感-电容供能模式间的临界电感的公式如下：                                     L                        C             1                      ′                  =                                                V                o                                         T               s                                                4                            π               2                                         I               o                                                     (           1           -           d           )                             (                        1             2                      -           d           )                  [                    θ           2                  +                                 (             2             π             -             θ             )                      2                  ]                       d         <         0.5                                            L                        C             2                      ′                  =                                                 V               o                                         T               s                                                4                            π               2                                         I               o                                                                                                  (                 1                 -                 d                 )                              2                                         (               d               -                                1                 2                              )                                    d                  [                    θ           2                  +                                                (               2               π               -               θ               )                          ]                      2                                 d         >         0.5                (2)根据变换器的工作模式及相关参数确定升压电感取值：当d的范围为(0，1)，θ的范围为(0，2π)时，对以上公式分别求取极大值，可得到LC1、LC2、L′C1和L′C2的极大值LC1max、LC2max、L′C1max和L′C2max；若采用连续导电模式，选取电感值大于LC1max和LC2max中的大者；若采用电感独立供能模式，则选取电感值大于L′C1max和L′C2max中的大者。