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Dietary lipid oxidation is a lasting concern to aquafeed manufacturers and aquaculture farmers. Here, we determined if there was an association between oxidized fish oil (OFO) and hepatopancreatic injury in Chinese mitten crab, and evaluated the alleviating effects of a combination of vitamins C and E on hepatopancreatic injury. There were significant reductions in the body weight gain, hepatopancreatic...
This paper proposes and designs a switching cell using paralleled gallium nitride (GaN) high-electron-mobility transistor (HEMTs) in the minimized, symmetric power and gate loops. Based on the design, 1Ω gate resistor was successfully applied to speed up the switching transient. The switching cell can be easy to replace on the mother board thanks to the pluggable connector and the cell owns unique...
As silicon carbide (SiC) and gallium nitride (GaN) devices become commercially available nowadays, high switching frequency operation becomes a popular way to increase the power converter efficiency and power density. A key trade-off of these gains is the increasing electromagnetic inference (EMI) noise. In order to attenuate the EMI noise from the power loop into the auxiliary sources, the isolation...
This paper presents the in-depth design of an isolated dc-dc power converter for aerospace applications rated at 30 W, dual 15 V dc outputs, 10–80 V input, switching at 1 MHz and using enhancement-mode GaN power transistors. A recently proposed three-switch active-clamp flyback topology is chosen as an effective means to deal with the large input voltage variation, and meet the high efficiency target...
With fast power semiconductor devices based on GaN and SiC becoming more common, there is a need for improved driving circuits. Transformers with smaller inter-winding capacitance in the isolated gate drive power supply helps in reducing the conducted EMI emission from the power converter to auxiliary sources. This paper presents a transformer with a small volume, a low power loss and a small inter-capacitance...
With the fast-switching devices like GaN HEMT applying in power converters, the converters achieve higher switching frequency, higher efficiency and higher power density. As a result of the fast switching edge and high commutation speed, the issues like electromagnetic interference (EMI), overvoltage, gate protection become daunting tasks. The active gate control technique has been verified on the...
With the high electromagnetic interference (EMI) noise generated by fast-switching-speed devices, it is crucial to learn about EMI noise generation and propagation in the systems and design effective EMI filters. EMI behavioral models have been verified as an effective tool to predict common-mode (CM) and differential-mode (DM) EMI noise and aid in EMI filter design. However, these models cannot predict...
With silicon carbide (SiC) devices increasing in commercial availability, high switching frequency is becoming a general trend to increase the power density of power converters. High switching frequency operation nonetheless exacerbates EMI emissions in a system, for which accurate EMI models of power converters are needed to predict noise and aid in the design of their EMI filters. Accordingly, this...
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