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Gallium Nitride (GaN) HFETS are an enabling technology for high-density converter design. This paper proposes a three-level dc-dc converter with dual outputs based on enhancement-mode GaN devices, intended for use as a battery charger in aircraft applications. The charger can output either 28 V or 270 V, selected with a jumper, which meets the two most common dc bus voltages in airplanes. It operates...
This paper introduces a new single-switch nonisolated dc-dc converter with very high voltage transfer ratio and reduced semiconductor voltage stress. The converter utilizes an integrated autotransformer and a coupled inductor on the same core to achieve a high step-up voltage gain without extreme duty cycle. Further, an integrated passive regenerative circuit recycles the leakage energy of the coupled...
This paper clarifies the relationship between the current ripple and the power density in bidirectional DC-DC converters. In the conventional power density design method, in order to obtain the pareto-front curve of the power density and the efficiency, the current ripple is designed as constant value, whereas the switching frequency is varied. As a result, the possibilities of higher power density...
A level-shifting circuit with sub-nano-second propagation delay for high input voltage switched-mode power converters is presented. The proposed circuit uses isolated low-voltage NMOS transistors and capacitive coupling to shift the control signal of the high-side power switch from a low-voltage logic domain (VLogic ∼ 5V) up to a high-voltage power domain (VIN ∼ 65V) with less than 115ps propagation...
This paper presents a DC-DC power converter control scheme and system architecture for batteries which are connected in parallel in order to maintain State-Of-Charge (SOC) balancing between batteries without the need for additional circuitries and their associated controllers. When the battery cells or battery packs are connected in parallel, it is desired to maintain SOC balancing during both charging...
Field Programmable Gate Arrays (FPGAs) are widely used in telecom, medical, military and cloud computing applications. Unlike in microprocessors, the routing and critical path delay of FPGAs is user dependent. The design tool suggests a maximum operating frequency based on the worst-case timing analysis of the critical paths at a fixed nominal voltage, which usually means there is significant voltage...
In this work, the first reported integrated silicon carbide (SiC) CMOS gate driver is presented. The gate driver is designed in a 15V, 1.2 µm silicon carbide CMOS process, and simulated from 25 °C to 300 µC. The gate drivers are packaged and tested over a wide temperature range. Measured peak output current exceeds the 4 A source, 8 A sink current design goals at room temperature. The measured gate...
A general-purpose clocked gate driver (CGD) IC to generate an arbitrary gate waveform is proposed to provide a universal platform for fine-grained gate waveform optimization handling various power transistors. The fabricated IC with 0.18µm BCD process has 63 PMOS and 63 NMOS driver transistors on a chip whose activation patterns are controlled by 6-bit digital signals and 25-MHz clock (= 40-ns time...
A novel low-inductance packaging layout for Full-SiC (Silicon Carbide) MOSFET (Metal Oxide Semiconductor Field Effect Transistor) Module with split damping capacitors embedding inside is proposed in this paper. The 3-Demision model of the optimized layout was built and analyzed with ANSYS Q3D. The total self-inductance of the single commutation loop is only 6.2nH. Additionally, 55V voltage spike over...
This paper describes a Very High Frequency (VHF) converter made with three Class-E inverters and a single Class-DE rectifier. The converter is designed for the US mains (120 V, 60 Hz) and can deliver 9 W to a 60 V LED. The converter has a switching frequency of 37 MHz and achieves an efficiency of 89.4%. With VHF converters the power density can be improved and the converter described in this paper...
Multi-level approaches to AC/DC power conversion have been successfully deployed in high-voltage high-power industrial applications, and are recently considered for mid-power ranges due to their capability of reducing component sizes and improving efficiency. The main challenge for mid-power deployment is the complexity of sensing circuits and control algorithms used to maintain the capacitor voltage...
An application of an input current harmonic filtering technology, namely power semiconductor filter (PSF), for conventional flyback AC/DC converter will be presented. By connecting a series-pass device (SPD) in series with the input of the flyback converter, the input current of the entire system has the waveform profiled to be in phase with the supply voltage and its magnitude adjusted to perform...
This paper presents a novel topology for instantaneous reactive power compensation. The topology is derived from Dynamic-Current or Dyna-C, which is a patented power converter capable of transferring energy for two- or multi-terminal DC, single- and/or multi-phase AC systems. The proposed topology has a modularized low-voltage current source building block that can be stacked for medium-voltage (MV)...
A bidirectional isolated dual-active-bridge (DAB) converter with three-level voltage-doubler rectifier (TL-VDR) is presented for energy storage applications. The voltage conversion ratio is enhanced and the voltage stresses on transformer windings are reduced with the help of TL-VDR. Optimized pulse-width-modulation (PWM) plus dual phase-shift-modulation (PSM) strategy is applied to the presented...
Modular multilevel converters (MMCs) are being developed for the grid connection of offshore wind or tidal farms. In order to reduce the construction and maintenance costs, it is desirable to reduce the weight and volume of the MMC systems. In most existing MMC submodule designs, the reservoir capacitor usually accounts for over 50% of the total volume and 80% of the total weight. This paper presents...
A dual-phase-shift controlled isolated buck-boost converter is presented for wide input or output voltage range applications. Two transformers and a voltage-doubler rectifier with embedded bidirectional switch are employed. The primary windings of the two transformers are in series and the secondary windings are in parallel. With optimized dual-phase-shift modulation strategies, zero voltage switching...
This paper proposes a dual voltage regulations of single switch flyback converter using variable frequency control. By adding an adjusted filter to secondary windings, each output shows different tendency according to the switching frequency. This means that even if the switching duty is same, the output voltage might be not equal at the different switching frequency. So the output voltage can be...
Digital isolators are widely used in isolated power converters for transmitting high-frequency gating pulses. Opto-isolators generally suffer from low reliability, while emerging RF based isolators are expensive and power-hungry. In this work, two Phase-Locked-Loop (PLL) based synchronization schemes are introduced and demonstrated to operate a bidirectional Dual-Active-Bridge (DAB) dc-dc converter...
The dual active bridge (DAB) converter is an isolated bidirectional dc-dc topology which is the most critical part for the power conversion systems such as solid-state transformers (SST). This paper focuses on analysis and design of high frequency ac inductors which are the power interfacing component in DAB converters or DAB's derivative topologies for transferring energy between the primary and...
Transformer is an important common mode (CM) noise coupling path in isolated power converters. But the EMI behavior of transformer is difficult to predict because of the complicated high frequency parasitics. This paper proposes a transformer Common-mode (CM) noise coupling path modeling approach based on multiconductor transmission line (MTL) theory. The MTL model can include the complicated magnetic...
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