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In this paper, a plug-and-play ripple mitigation technique is proposed. It requires only the sensing of the DC-link voltage and can operate fully independently to remove the low-frequency voltage ripple. The proposed technique is nonintrusive to the existing hardware and enables hot-swap operation without disrupting the normal functionality of the existing power system. It is user-friendly, modular...
In this work, a Sawyer-Tower circuit is employed to characterize the output capacitance (COSS) of advanced superjunction MOSFETs. It is shown that some of the most advanced superjunction MOSFETs exhibit significant hysteresis in their output capacitance which leads to unrecoverable power loss. This work shows that the conventional impedance analyzer method can only measure COSS accurately when hysteresis...
The purpose of this paper is to provide a detailed description of a technique that modifies the characteristics of analog-to-digital converter (ADC). The overall design objective for any power converter is to reduce the size, cost and power losses. In a digitally controlled system-on-chip (SoC) application, this results in a tradeoff between the performance and resolution of the ADC and digital PWM...
The efforts on more reliable power conversion systems are gaining momentum in the recent years. Majority of the studies concerning reliability of power switches focus on the package related failures, mainly caused by the thermal stress. The basic failure precursor for this type of stress has been identified as increased on-state resistance for power MOSFETs in recent literature. However, calculation...
This paper presents a study of the isolated DC/DC stage of Bi-directional on-board battery charger module (OBCM) for electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV) application. The conventional series resonant converter and secondary-side-switch delay-time control is employed. The delay-time control is used to assist the conventional variable-switching-frequency control of primary...
The paper presents the design and development of an ultra-high efficiency bidirectional isolated full bridge dc-dc converter using Gallium Nitride (GaN) devices. To achieve ultrahigh efficiency, GaN devices, synchronous rectification and high efficiency magnetics are used. The proposed bidirectional converter allows a power flow in both directions using the same power components; this increases power...
This work describes in detail the design, fabrication and characterization of on-silicon coupled inductors. The coupled inductors are fabricated using a double metal layer process for improved performance. Further, the fabricated devices are characterized for small signal, dc bias and large signal testing at high frequencies (up to 15 MHz). The small signal testing includes both impedance analyzer...
This work presents a driver for High-Brightness Light-Emitting Diodes (HB-LED) in three-phase grids, which complies with IEC 1000-3-2 Class C requirements, achieves high Power Factor (PF), low Total Harmonic Distortion (THD), as well as, the capability to achieve full dimming while disposing of the bulk capacitor and having galvanic isolation. The HB-LED driver is based on the use of six four-port...
Commercially available Silicon Carbide (SiC) MOSFET power modules often have a design based on existing packages previously used for silicon insulated-gate bipolar transistors. However, these packages are not optimized to take advantage of the SiC benefits, such as, high switching speeds and high-temperature operation. The package of a half-bridge SiC MOSFET module has been modeled and the parasitic...
In this paper, detailed static characterization of the new 650 V/ 30 A GaN device from GaN Systems is presented. The on-resistance and output capacitance of this device are considerably low making GaN a viable option for high switching frequency (in the range of MHz) medium power applications (> 3 kW). A comprehensive examination of device characteristics and variation of device parasitics depending...
This paper proposes a new active capacitor voltage balancing method for five-level stacked multicell converter which is fully implemented using the logic-form equations. The proposed active voltage balancing method measures load current and flying capacitor voltages in order to generate the appropriate switching states to produce the required output voltage level as well as to balance the flying capacitor...
This paper presents a three-phase transformerless uninterruptible power supply (UPS) with sinusoidal pulse width modulation (SPWM) based division-summation (D-Σ) digital control. A transformerless UPS controls the power flow between dc link and utility grid, as well as tracks the ac reference voltage. The proposed control law derived with D-Σ digital approach takes into account the effects of dc-link...
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...
The three-phase modular cascaded solid stated transformer (SST) is an important element in the micro-grid systems as its outstanding adventures compared with conventional power transformer. It consists of three stages, the three-phase cascaded modular rectifier stage, the dual active bridge (DAB) converter stage and the three-phase inverter stage. Three output-paralleled DAB converters offer three...
The flying-capacitor-based multicell converter is one of the well-known breeds of multilevel power converters. This paper proposes a new flying-capacitor-based multilevel converter to minimize the number of flying capacitors (FCs) and power switches. The advantage of the proposed FC-based multilevel converter in comparison with the conventional flying capacitor multicell converter is the fewer number...
This paper presents the performance evaluation under grid voltage sags of a two parallel-interleaved grid-connected converters employing low switching frequency. A current controller based on the synchronous reference frame including voltage feed-forward is used. The dominant frequency components from the direct- and quadrature-axis voltage Vd and Vq are eliminated by using an adaptive moving average...
This work presents a high-voltage GaN-based power HEMT with a highly-linear, monolithically-integrated temperature sensor. The principle is shown and compared to other concepts. The sensor is fabricated by using a interconnect metallization without additional process steps. The performance of the sensor as well as of the power device is characterized. The 600 V power device achieves an on-state resistance...
This paper proposes a simple MATLAB/ SIMULINK model of a three-phase, three-legged, saturated transformer. A fictitious delta winding is added to three single-phase saturable transformers. The proposed model is simple and fairly accurate to model the nonlinear characteristics of a saturable three-legged transformer including mutual coupling.
In this paper, an enhanced modeling method for accurate equivalent circuit model (ECM) of Li-ion battery is proposed. Modeling with curve fitting is analyzed and consequently, adaptive experimental conditions and appropriate fitting methods are proposed. An inaccurate phenomenon of the existing modeling method caused by inner capacitive impedance is analyzed. For matching model output and battery...
This paper proposes a combined control strategy for direct matrix converters (DMC) to stabilize the input side filter without any passive damping, simultaneously realizing the field oriented control (FOC) of an induction machine (IM) at the output. The speed control of the FOC with subsidiary torque control is left untouched. The rotor flux control loop is extended to a cascaded structure that additionally...
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