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This paper investigates nonlinear control methods for single-ended primary-inductor converters (SEPIC). The fast-switching and average models show the converter nonlinearity in terms of inductor currents, capacitor voltages, and the switching duty cycle. The control law intuitively should be nonlinear to drive and guarantee the system stability. Two different control laws based on the passivity and...
In this paper, a new control method for capacitive link universal power converters is proposed to eliminate the need for measuring the output and input voltages. Capacitive link universal converters are a new class of power converters that offer high power density and reliability, and are capable of transferring power between any type of source and load, dc or ac, with any number of phases, emerges...
Fault tolerant operation can significantly improve the reliability of a Modular Multilevel Converter (MMC), but the precondition is that a fast and accurate fault detection and localization method has been embedded into the MMC control system. This paper proposes a fault diagnosis method used in a distributed control architecture, which makes the local controllers capable of identifying the switching...
In this paper, a method to diagnose and identify the open-circuit faults of IGBT for a six-level hybrid inverter (6L-HI) is proposed, which is based on the signals of the inner device voltages, the flying capacitor voltages and the phase currents of the inverter. Since the flying capacitor voltage sensors and the output current sensors are already employed for the inverter operation, only one additional...
At present, the field of power factor corrected (PFC) rectifiers are very much matured. Typically a single phase PFC converter requires measurements from three independent sensors i.e. input voltage, input current and output voltage. By considering a need of farther compact and more flexible in terms of input to output voltage gain, a new UPF rectifier with two buck-boost converter operating in interleaved...
This paper proposes a modified sub-module voltage measurement technique for the PSC-PWM modulated modular multilevel converter (MMC) using less voltage sensors. With this technique, the sub-modules per arm are divided into several groups according to their respect carrier phase angles. This arrangement ensures that only one sensor is needed within each divided group. Therefore, the number of sensors...
In this paper, a high gain boost converter based on the voltage-lift technique is proposed. The converter is composed of basic quasi-Z-source cell and a voltage-lift cell which contains one capacitor, two inductors and diodes. Contrasted with the traditional quasi-Z-source DC/DC converter, a relatively high voltage conversion and the reduction of the input current ripple can be achieved with the presented...
A compact differential voltage reference cell, which combines an original switched capacitor integrator with a digitally programmable bandgap core, is presented. The two-stage integrator maintains an always-valid output voltage while performing correlated double sampling to effectively reduce the effects of offset and flicker noise. Measurements performed on a prototype designed with the UMC 0.18...
The small system size and low power level of recent small loT (Internet of Things) systems render a switched-capacitor power converter more favorable than a traditional inductive converter because of its easy integration on chip and control for low power output. This paper presents a number of low-power switched-capacitor techniques for solving challenges of a millimeter-scale real IoT system, including...
This report studies the influence of printed circuit board (PCB) design on voltage overshoot and ringing oscillation in switching operation of gallium nitride gate injection transistor (GaN-GIT) for high-frequency DC-DC converter. The parasitic inductances in the main power loop have been identified based on moment of method (MoM) analysis and frequency characteristics of impedance measured with 2-port...
This paper presents a novel structure of high step-up DC/DC converters intended for distributed generation systems such as fuel cells and photovoltaic (PV) systems. Proposed topologies integrate the classical Y-source impedance network with different step-up cells to acquire strong boost ability which is unmatched by existing impedance networks. Compared to Y-source, proposed converters reserve versatile...
Flying capacitor multilevel (FCML) converters are known to naturally balance the capacitor voltages through the use of phase-shifted pulse-width modulation. However, in practice, the capacitor voltages can still deviate and active balancing is often required. This work investigates the origins of the voltage imbalance in practical implementations of such converters and presents corresponding solutions...
Gokmen and Vlasov proposed that the training of deep neural networks would be dramatically accelerated by the realization of resistive processing units that can store analog weights to minimize data movement during training [1]. Here we measure and evaluate the partial switching of the ferroelectric (FE) PbZrTiO3 (PZT) and, for the first time, Hf0 8Zr0 2O2, (HZO), formed by atomic layer deposition,...
This paper proposes a novel LED driver, which consists of an isolated single-switch AC-DC converter with power factor correction (PFC) suitable for streetlight applications. Theoretical analysis of operational modes for the presented LED driver is included. In addition, a 65W-rated prototype circuit of the proposed LED driver with an input utility-line voltage of 110 V has been implemented and tested...
This paper presents a novel low-cost photovoltaic (PV) microinverter with an ultra-wide MPPT voltage range. This approach is based on the two-stage energy conversion where the front-end boost half-bridge DC-DC converter is used to step up the fluctuating PV voltage to a stabilized high DC voltage, which is next transformed to a grid compliant AC voltage by the grid-tied inverter. The operation principle...
A successive approximation register (SAR) analog-to-digital converter (ADC) design in 0.18-um CMOS process is presented for wireless power transfer applications. By applying body effect reduction T/H circuit that improved ENOB of the ADC. This proposed ADC uses asynchronous control logic without off-chip frequency clock. The measured consumption of 1.53 mW at input voltage of 1.8 V, sampling rate...
The great number of power modules (PMs) imposes great computational challenge on the voltage balancing of modular multilevel converter (MMC) as the sorting of the PM capacitor voltages is usually adopted. This paper presents a distributed control method for PM capacitor voltage balancing in MMC. With this method, all PMs in one arm are grouped and the sorting algorithm of the voltage balancing in...
Ferroelectric capacitors based on thin films such as lead zirconate Titanate(PZT) and strontium bismuth titanate (SBT) have capacitance density and significant spontaneous polarization. DC-DC switching polarization switching converter is presented in this paper with the utilization of ferroelectric capacitor. The topology used in this converter is series and parallel which is analyzed using calculations,...
A non-contact inductive voltage divider (IVD) type displacement transducer that directly provides a digital output proportional to the displacement of the non-contact (floating) wiper is presented here. The floating wiper IVD becomes an integral part of a suitably modified dual slope type digital converter (DSDC) and the logic of conversion ensures that the digital output of the DSDC is not affected...
In this paper, we conduct a data-driven experimental analysis on capacitor bank switching event at a distribution grid in Riverside, CA using data from two distribution level phasor measurement units, a.k.a, μPMUs. Of particular interest was to detect the capacitor bank switching events based on feeder-level and load-level μPMUs and thus eliminating the need to install separate sensors for the switched...
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