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There is power circulating flow in dual-active-bridge(DAB) dc-dc converter under the traditional single-phase-shift(SPS) control, and this is the main factor contributing to larger current stress and larger converter loss. In order to eliminate the power circulating flow and reduce the current stress, this paper proposes a novel dual-phase-shift(DPS)control method. By analyzing the operating principle...
This paper describes an accelerated test method for power on/off cycling effect on electronic products. Power on/off cycling impact the reliability of electronic equipment has become a research focus in the past several years. Early research mainly focused on the tubes, and later extended to the solid state devices, most of the current study focused on the internal damage impacted by power on/off...
LONGSHAN tunnel, with two-way three-lane and large span twin-arch, is located in Wuhu, Anhui province, China. The tunnel is shallow buried in all length and the maximum buried depth is less than 10m. Its geological structure is complicated and over 1/3 of the tunnel is located in fault zone, the classification of the surrounding rock belongs to class V. The on-site monitoring indicates that the stress...
In three-phase PFC converter, there exist severe switch antiparallel diode reverse recovery problems. The effective measures of compound active-clamping and minimal voltage active-clamping techniques in single phase PFC are extended to three-phase PFC. A family of active-clamping ZVS soft switching PFC converter is derived. They can effectively suppress the diode reverse recovery and realize ZVS for...
In three-phase PFC converter, there exist severe switch antiparallel diode reverse recovery problems. The effective measures of compound active-clamping and minimal voltage active-clamping techniques in single phase PFC are extended to three-phase PFC. A family of active-clamping ZVS soft switching PFC converter is derived. They can effectively suppress the diode reverse recovery and realize ZVS for...
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