Inclusive Design and Development of Front-End Multiphase Rectifier With Reduced Magnetic Rating and Improved Efficiency

A new series‐connected 36‐pulse rectifier with hybrid DC‐reinjection method for high power output

“…In the transformers, there are primarily two types of losses: core loss and ohmic loss. And core loss consists of hysteresis loss ( P h ) and eddy current loss ( P e ) [34], which can be calculated by the formula (26). $$$$\begin{equation}\left\{ \def\eqcellsep{&}\begin{array}{l} {P_{\rm{h}}} = {K_{\rm{h}}}f{B_{\rm{m}}}^{1.6}\\[6pt] {P_{\rm{e}}} = {K_{\rm{e}}}{f^2}{B_{\rm{m}}}^2 \end{array} \right.,\end{equation}$$$$where B m is the maximum flux density, f is the frequency of the alternating flux, and K h and K e are the proportionality constants that rely on the volume and quality of the core material used, as well as on the resistivity and volume of the core material employed.…”

“…Due to the low ratio of diode on‐off, off‐off and cut‐off loss, only the on‐state power losses of the diodes is included for simplified analysis. Combined with literature [34], the formula for calculating diode on‐state loss can be expressed as $$$$\begin{equation} \def\eqcellsep{&}\begin{array}{rcl} {P_{{\rm{Diode - loss}}}} &=& \dfrac{1}{{{\upi}}}\displaystyle\int\limits_0^{{\upi}} {({U_{\rm{d}}}{I_{{\rm{av}}}}} + {I_{{\rm{av}}}}^2{R_{\rm{d}}}){\rm{d}}(\omega t)\\[15pt] &=& {U_{\rm{d}}}{I_{{\rm{av}}}} + {I_{{\rm{av}}}}^2{R_{\rm{d}}} \end{array} .\end{equation}$$$$…”

“…The diodes Due to the low ratio of diode on-off, off-off and cut-off loss, only the on-state power losses of the diodes is included for simplified analysis. Combined with literature [34], the formula for calculating diode on-state loss can be expressed as In formula (30), I av is the average value of the current flowing through the one diode and R d is the equivalent internal resistance of the diode, assuming R d = 0.001∧and U d = 0.8 V. Considering the working modes of HAC, it can be seen that the on-state angle of Dv1 and Dv2 within a cycle of 2ß is (ß∕2 − 6𝛿), and the corresponding average current I av1 is calculated as 0.006I o from Figure 7. Hence, the loss P Diode1 of Dv1 and Dv2 can be calculated as…”

“…In the transformers, there are primarily two types of losses: core loss and ohmic loss. And core loss consists of hysteresis loss (P h ) and eddy current loss (P e ) [34], which can be calculated by the formula (26).…”

An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft

“…The proposed 24PR configurations are compared with 20PR [9][10][11]29], 24PR [22], 40PR [15,16], and 72PR [17,18] in [17,18,29], the cost can be estimated at 4.5 times of kVA rating of a transformer. Also, it should be emphasized that the total cost and size of the system are determined by the transformer magnetic rating.…”