High-Frequency Equivalent Circuit Model for Common-Mode Noise of Buck Converter

Optimal design of high frequency high efficiency and high‐power density DC–DC power module based on GaN

“…The LLC converter working in DXC mode has no modulation requirement for leak‐inductance L r , only need to obtain the optimal excitation inductance L m and dead zone time at the selected frequency. Because the LLC resonant converter constant 48–24 V, the primary side and the secondary side are low voltage, the EMI radiation, conduction and noise source pressure caused by dv / dt is small, only need to adopt the 8‐layer PCB winding structure can realize LLC transformation; The secondary side adopts centre tap, which can be designed into a perfect staggered structure, at the same time reduce common mode noise and reduce core loss [6–12].…”

“…In order to improve the efficiency of the interleaved buck converter, it is very important to select a suitable main power gallium nitride switching devices [6][7][8][9][10][11][12][13][14]. The performance of switching devices is evaluated by switching loss, turn-off loss and driving loss.…”

“…Figures 6 and 7 show the reluctance model and structure model of the planar cross-coupling inductance respectively. ɸ 1 and ɸ 2 are the magnetic flux of the planar cross-coupling inductance outside column, ɸ 3 is the magnetic flux of middle column [7][8][9][10][11][12][13]. A e1 and A e3 are the cross-sectional areas of the cross-coupling inductance outside column and middle column Referring to the reluctance model in Figure 6, the magnetic flux of outside column ɸ 1 and middle column ɸ 3 can be deduced respectively:…”

“…The efficiency and power density of the power module cannot effectively improved only by optimizing the switching devices of powers main circuit, which need to be further combined with power module's planar core design, the main power switching services working at zero voltage switching (ZVS) and zero current switching (ZCS) technology [8][9][10][11], reduce the opening loss and conduction loss of switching devices, enhance the utilization rate of magnetic core of planar transformer, and optimization design of the circuit topology together. To further improve the efficiency and density of the existing power module, break the technical bottleneck that hinder the stagnant development of power modules [7][8][9][10][11][12].…”

“…American's Bel-fuse (0RQB-C5W24R-1839HZ), the current most advanced power module as a reference standard, which adopt metal-oxide-semiconductor field-effect transistor as switching devices, use single level topology architecture, the size is a quarter standard package, the peak efficiency can reach 95% [26]. To make a fair comparison, taking the current most advanced power module as the standard, in the same package and same size of the case, using two-level topology structure, and gallium nitride as a switching device develop a power module [8][9][10][11][12][13][14][15]. Here, the current most advanced power module (American's Bel-fuse) is analyzed in detail, including topology selection, efficiency, advantage and disadvantages [19,20].…”