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Approximate nearest neighbors search can be implemented by hashing based vote counting. This implementation can be extended to multi-bit case when vectors are hashed to multi-bit in each hashing. This improves the retrieval efficiency and saves the computation on hashing operation. The performance of multi-bit vote count can be further improved by the concept of weak range. In this manuscript, multi-bit...
This article presents a substantial review of nonlinear memristive circuits based on Zdenek BIOLEK model alonside an innovator design developed within the Hewlett-Packard laboratories. HP realized a physical implementation of memristors by placing two layers of titanium dioxide between two electrodes. The first layer is partially doped with oxygen gaps and behaves like a semiconductor and the second...
Active Thermal Control (ATC) consists in driving power switches in a less efficient way when low load conditions are present. The resulting wasted power is used to self-heat the device, reducing amplitude and occurrence of thermal cycles and hence improving the reliability. This paper presents a novel way to control losses, and hence temperature, of both positive- and negative-current devices in half-bridge...
Cell voltage equalizers are important for the batteries of electric vehicles and other energy storage systems in order not to be reduced their capacity. The authors have proposed a cell voltage equalizer using an LC series circuit; however, the equalizer requires a lot of bi-directional and multi-stage connected switching elements to equalize the voltage across each battery cell. This paper proposed...
While investigations on short-circuit ruggedness of discrete SiC MOSFET are widely encountered in the scientific literature, there is not so much research dealing with the operational robustness of high power SiC MOSFET modules. In this paper, the short-circuit (SC) ruggedness under hard switching fault (HSF) of a commercial 1.2 kV/180 A SiC MOSFET power module in half-bridge configuration will be...
This paper presents a DC bus voltage balancing control method for the grid-connected hybrid cascaded converter with renewable energy sources. The proposed control method is based on the power flow management in the hybrid cascaded converter, which is investigated in this paper, and is thus capable of overcoming the unbalanced conditions arising at DC-side or AC-side. Laboratory test results under...
In this paper, an integrated gate drives and current sensing solution for SiC (Silicon Carbide) power module is proposed. The gate drives and current sensing share the same isolated power supply to minimize the amount of dc rails. The isolated power supply is based on fly-buck topology, which is very suitable for high-frequency operations to minimize the volumetric occupation. Each gate drive has...
A novel non-volatile 1-bit binary comparator based on pure memristors and an 8-bit comparator based on 1T1M (1 transistor per memristor) crossbar array are proposed in this paper. The proposed comparator is sneak-path free and has short delays. It can be extended to an arbitrary N-bit comparator with 7N memristors and 7N transistors. The worst case input-to-output delay is 4.8ns. A 64-bit comparator...
An original and modern integrated current sensor is designed and presented in this paper. It can provide a sense current proportional to an output current available to the microcontroller via an external resistor. The ratio between output and sense current is modeled and simulated. The errors between the two currents increase in low currents domain. A solution consisting in a gate back regulation...
Roof-top solar PV system has an important place in the context of rural electrification where extension of distribution grid is not economically viable. In this paper, a solar PV converter system with low storage requirement is proposed which is suitable for this application. The system consists of two boost converters of different power rating connected to the output of a solar PV panel. The output...
A three-phase interleaved boost converter stage of an ac-dc PFC converter that uses GaN switches is developed that utilizes a feed-forward band-stop filter control method to suppress low-frequency output voltage ripple. To increase power density, the converter switches at 500 kHz, operates in triangular current mode (TCM) to achieve zero voltage switching (ZVS), and uses GaN switching devices. A 1-kW...
A novel N-JFET structure, combined with an innovative control gate between the uniform P-top and source is proposed. Control gate has a heavily doped P-type and a gap to uniform P-top. Pinch-off voltage of the JFET device can be easily adjusted by the size of the gap, while the breakdown voltage can be kept in the range of 700V ∼ 800V. Rather than using 3D simulation which is more time consuming,...
According to the motor control driver in power, current and installation space requirements, this paper presents a MOSFET for power devices to meet the design scheme of high current, low voltage, high reliable motor control driver, and analyzes the key problems of gate resistance selection, absorption circuit, and parallel average current etc. and solves the problems in the present designs. Through...
This paper proposes the novel generation method of gate signals to control output voltage in a wide range and to achieve synchronous rectification operating in half-bridge LLC resonant converters. The switching frequency modulation is used in half-bridge LLC resonant converters for control strategy of output voltage. The switching timing of secondary MOSFETs is compensated using the gate signal of...
In this paper different gate drive concepts to eliminate parasitic turn-on for SiC MOSFETs are discussed. Experimental results show a potential for lowering switching losses of SiC MOSFETs during fast switching operation, reduction of turn-off overvoltage across the bodydiode. Finally increased requirement on the gate drive unit are discussed.
A digitally controlled LDO in 14nm tri-gate CMOS powering an Atom™ core with embedded power gates enables per-core DVFS over a wide voltage-frequency range. The LDO demonstrates 99.6% peak current efficiency at 2.5A load current and provides a power density of 26.1 W/mm2. The multi-mode digital controller featuring non-linear mode and adaptive gain achieves <20ns settling time with a 100mV droop...
The advancing trend to autonomous driving tightens the requirements for automotive microcontrollers with embedded flash memories. High reliability and low latency demands however have prevented the broad usage of multilevel-cell flash in this sector so far. This paper describes a robust time-domain voltage sensing scheme tackling the challenges arising from these tight conditions. A dynamic voltage...
Ordinary single phase inverter gives a square wave output which when applied to electrical appliances may damage the later, reduce its efficiency as well as life as this inverter output waveform is not sinusoidal and contains lower and higher order harmonics in addition to fundamental. Moreover, the output voltage cannot be controlled. In this paper a single phase half bridge inverter is discussed...
Since 2002 AAA plant has been struggling to control the temperature on reactor RE1002, with 96 cartridges heaters, 525VAC with a power of 12kW each. In order to guarantee the desired heat transfer supplied by the electrical heater, a multiple PI control technique is proposed. And Numerical simulations are carried out to show the effectiveness of the control technique. A Switch-mode power supplies...
The elimination of electromagnetic emissions (EME) in switch mode power supplies (SMPS) has high importance especially in automotive applications. External filters, spread spectrum techniques and the output driver circuits are the main methods to influence the switching behaviour of SMPS. This paper presents the concept of an output driver with adaptive current source control for high frequency SMPS...
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