Here we describe a gate-driver with resonant action that minimizes gating loss at high switching frequencies (10-20 MHz) while facilitating variable voltage gain that can exceed the supply rails. The gate voltage swing can be controlled with minimal duty cycle constraints, making this driver capable of meeting the diverse drive requirements of different switch technologies and converter topologies. A prototype uses two small N-channel gallium nitride (GaN) transistors within the drive structure, significantly decreasing parasitics. To do so, a capacitive decoupling technique is used to allow the high-side Nchannel device's 'flying' driver to receive power; a distinct challenge for flying drivers commuting between two variable voltages. The prototype was applied to several high frequency switching devices. Up to a 72% reduction in gating-loss is observed as compared to a conventional hard-charged gate-driver while maintaining rise and fall times <18 ns for the devices tested.
This paper aims to present a new point of view about the demand (active power) measured at the Point of Common Coupling (PCC) between the utility and the consumer when harmonic distortions are involved. The active power from distorted voltage and distorted current has harmonic components besides the fundamental component. Depending on the origin of the harmonic distortions, the active power due to this sum can result in higher or lower values in comparison to the fundamental component value. Such difference results in a higher or lower energy and demand billing and consequently, higher costs for the consumer or losses for the electric utility. Besides the financial issue, the one in disadvantage deals with the harmful effects of the harmonics generated by the other. Using theoretical analysis and computational simulations, the influence of the distortions from the electric utility or from the consumer are evaluated and compared.
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