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DC-DC converters have a different number of discrete states depending on
the position of their switches (on or off). The aim of this function is to
generate the small-signal model of a 2 discrete state DC-DC converter by
employing the symbolic engine of Matlab. Based on the equations of the
book "Fundamentals of Power Electronics" (Erickson and Maksimovic, 2001),
first the average model of the converter is obtained and then it is
linearized in order to generate the transfer functions of the small-signal
model. The function outputs the transfer functions of the output with
respect to the inputs as well as the duty cycle of the converter in a
symbolic form.
The inputs of the function are the discrete state matrices in a cell form
mA = {A1;A2}, mB = {B1;B2}, CA = {C1;C2} and mD = {D1,D2}, and the state
variable (X), input parameter (U) and output parameter (Y) vectors.
The validation file attached shows three examples for a buck, boost and
buck-boost converter with parasitic elements where this function is
employed. Some of the parasitic elements are set to 0 not to take them
into account in the small-signal model. However, these lines of code can
be commented to include them in the model.
翻译：
DC-DC converters have a different number of discrete states depending on
the position of their switches (on or off). The aim of this function is to
generate the small-signal model of a 2 discrete state DC-DC converter by
employing the symbolic engine of Matlab. Based on the equations of the
book "Fundamentals of Power Electronics" (Erickson and Maksimovic, 2001),
first the average model of the converter is obtained and then it is
linearized in order to generate the transfer functions of the small-signal
model. The function outputs the transfer functions of the output with
respect to the inputs as well as the duty cycle of the converter in a
symbolic form.
该函数的输入是一个单元形式的离散状态矩阵。
验证文件的连接显示一个降压三例，升压和降压-升压转换器的寄生元件，此功能是。一些寄生元件
设置为 0，不考虑他们的小信号模型。然而，这些代码可以评论包括他们的模型。
FUNCTION
smallsignal_model(mA,mB,mC,mD,X,U,Y)
代码：
function [Gy_u, Gy_d] = smallsignal_model(mA,mB,mC,mD,X,U,Y)
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