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

Abstract

This paper develops a railway power module with wide range voltage (dc 60—dc 160 V) input and constant voltage output (24 V/10 A) . The power module adopts a two‐stage topology structure to realize voltage conversion. Use the most advanced GaN (gallium nitride) as the main power switching devices. The first stage circuit architecture uses a two‐phase interleaved buck converter convert the wide range input voltage into a constant intermediate bus voltage (48 V) through closed‐loop control, and then the LLC resonant converter converts the intermediate bus voltage (dc 48 V) into a constant output voltage (dc 24 V) through open‐loop control, and realize the primary side and secondary side dc 3000 V electrical isolation. This article from the circuit topology, the power devices selection, buck converter magnetic integrated coupling inductance design, planar magnetic integration LLC resonant transformer optimization design has carried on the detailed discuss and analysis. All circuits are integrated in a standard quarter power brick module, the final prototype can reach 96.1% peak efficiency, the power density can reach 185 W/in.3.

Analysis of Losses in a Three-Port High-Frequency Transformer Under Different Frequencies and Load Conditions

“…The excitation current is crucial in measuring core losses under load, significantly affecting the primary current compared to no-load conditions. It is possible to derive the excitation current indirectly using (4).…”

“…Many studies support the addition of direct current (DC) networks at the distribution level, noting that they can significantly reduce conversion losses [1,2]. In this context, the role of DC-DC converters becomes paramount given the recent advances in power semiconductor technology, especially those that use materials like SiC [3] and GaN [4], which have led to the creation of modern power converters that operate at higher switching frequencies [5]. The dual active bridge (DAB) converter is suggested for many applications that need bidirectional power flow management.…”

EMI Common-Mode Noise Suppression and Magnetic Elements Winding Loss Optimization Design Based on GaN Cascaded Power Module

“…6: W 1 and W 0 are length and width of the outside column respectively, W w is the winding width, W m is the middle column width; L, W and H are coupling inductance's length, width and height. W 2 is the inductance's length to width core ratio, Aw is the magnetic core crosssectional, V 2 and V 1 are the core volume of the central column and outside column respectively [1]. Fig.…”

“…The associate editor coordinating the review of this manuscript and approving it for publication was Vitor Monteiro . increase: the fundamental and harmonic frequencies of the noise source increase with the increase of switching frequency [1], [2], [3]. ② Speed up switch: due to the distributed capacitance between potential changing switching device and zero potential ground conductor in the circuit, with the voltage of switching device V ds jumping, the induced charge and pressure difference are formed, as the switching speed increases, the high frequency harmonic component of the noise source increases [5], [6], [7].…”

Design and implementation of a novel high-frequency current transformer for partial discharge measurements

“…The HFCT (High-frequency Current Transformer), which is mounted on the grounding line of the cable shield, can be charged to detect the partial discharge signal [17][18]. In order to improve the performance of HFCT, researchers have done a lot of explorations, which have significantly improved the performance of HFCT [19][20][21][22][23][24]. However, HV cables are subject to a variety of external conditions interfering with PD detection, such as HV power line carrier signals with a frequency of 500 kHz and broadcast signals with a frequency of 100 kHz.…”