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A low quiescent current low-dropout regulator (LDO) applied in energy harvest system is presented in this paper. With super-source follower, the LDO has only one pole within loop unity gain bandwidth. And current buffer compensation is utilized to maintain the phase margin under the full range of load current. In order to decrease the power dissipation on the resistors of voltage divider, the resistors...
The feasibility of using commercial CMOS processes for implementing scalable cryogenic control electronics for universal quantum computers is investigated. Using a systems engineering approach, we break the system down into sub-systems and model the individual components down to transistor level. First results for area demand and power consumption indicate that even with a standard CMOS process, it...
Lightweight cryptography (LWC) provides cryptographic solutions for resource-constrained devices such as RFID tags, industrial controllers, sensor nodes, and smart cards. LWC based devices have stringent constraints on power consumption and are vulnerable to side-channel attacks such as Differential Power Analysis (DPA). The existing CMOS-based countermeasures for DPA are not suitable for circuits...
In this paper we present the first fully integrated analog LDO (low dropout regulator) for sub-0.5V supply voltages. The LDO can operate from 0.3V-to-1.0V input voltage, and can sustain a load variation of 10mA-to-100mA at 1.0V input and 5mA-to-25mA at 0.3V input. It achieves a peak 99.1% current efficiency for a 100mA load at 0.9V output voltage. In order to realize the gate drive at sub-0.5V supply...
This paper proposes a power-efficient capacitor-array-based digital-to-time converter (DTC) using a constant-slope approach. Fringe-capacitor-based digital-to-analog converter (C-DAC) array is used to regulate starting supply voltage of the constant slope fed to a fixed threshold comparator. The proposed DTC consumes only 15 μW from a 1V supply, while achieving fine resolution of 103 fs when running...
This paper presents a low-power all-digital first-order single-bit delta-sigma time-to-digital converter (TDC) with a differential bi-directional gated delay line time integrator. The differential time integrator features low power consumption accredited to the use of only one bi-directional gated delay line in performing time integration, full compatibility with technology scaling, rapid time integration,...
The paper presents a comprehensive charge modelling approach for field-effect transistor (FET) devices. For the first time an artificial neural network (ANN) is combined with the division-by-current approach to FET charge modelling. Using this technique a large-signal charge model is extracted for a 10 W GaN device from MACOM. It is shown through measurements that excellent results may be obtained...
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...
SiC JFET bi-directional switches (BDS) are widely used in construction of matrix converters, multi-level converters, solid state switches, etc. In this research work, the phenomenon of unwanted turn-on (UTO) of SiC JFET-based BDS and its related constant envelop oscillation is investigated. This phenomenon is critical to power conversion systems' stability and reliability. Firstly, the roots of UTO...
This paper proposes and designs a switching cell using paralleled gallium nitride (GaN) high-electron-mobility transistor (HEMTs) in the minimized, symmetric power and gate loops. Based on the design, 1Ω gate resistor was successfully applied to speed up the switching transient. The switching cell can be easy to replace on the mother board thanks to the pluggable connector and the cell owns unique...
A capacitor voltage balancing method for a three phase modular multilevel DC-DC converter (MMDC) is proposed in the paper. The MMDC is derived from a three phase DAB and a modular multilevel converter (MMC) and inherits desirable features of both topologies. To guarantee stable operation of the MMDC, submodule (SM) capacitor voltages are required to be balanced. The proposed balancing method is to...
An edge-resonant soft-switching time-sharing (TS) multiple-input (MI) dc-dc converter is introduced in this paper. The proposed converter can achieve high efficiency with zero-current switching (ZCS) and zero-voltage switching (ZVS). The zero-current switching (ZCS) can be realized on switch turned-on states, and the zero-voltage switching (ZVS) can be realized on switch turned-off states. In addition,...
This paper proposes a transformer based self-starting boost converter for thermoelectric energy harvesting, which operates even when polarity inversion of thermoelectric generator (TEG) occurs. TEG is used to convert thermal energy into electrical energy. Due to the Seebeck effect, an open circuit voltage of the TEG is proportional to the number of thermocouples in series and to the temperature difference...
In this paper, a resonant switched-capacitor dc-dc converter is proposed for data center application. The proposed converter possesses features such as high efficiency, high power density and light-weight. Zero current switching (ZCS) can be achieved with the resonant operation, which allows the converter operating under high efficiency. Proper switching device selection and in-depth power loss analysis...
This paper presents dV/dt control technology that enables lower switching loss and surge, especially higher speed switching of silicon carbide (SiC) devices. This technology is a surge reduction method using a high-speed passive gate driver that independently controls turn-on and turn-off events. Experimental results for a prototype gate driver confirmed that switching loss can be reduced by half.
This paper presents a bootstrap driver that can operate a normally-on, a depletion-mode, GaN FET power device as a normally-off device. The bootstrap driver based on a diode-clamp circuit which is composed of a capacitor and a diode, shifting the input voltage by a negative amount (−10V) to turn off the power switch with a negative threshold (−8V). However, due to the clamp capacitor discharge by...
High quality voltage and current are required when PV generator is connected to grid utility. To this, multilevel inverters are very desirable to be used as connection interface. To keep the cost of the whole system as low as possible, a cost-effective control device using STM32F4 discovery board is employed to control three-level inverter that can be used in grid-tied PV system. The paper develops...
In this paper, design considerations for transitioning from a Si-IGBT based inverter to a SiC-MOSFET based inverter are discussed. An existing Si-IGBT power structure is modified using a footprint compatible SiC-MOSFET module, with changes made to the power structure and gate drive for the high PWM switching frequency required for SiC devices. Design issues such as inductance minimization, EMC mitigation...
This paper addresses the replacement of enhancement mode Si IGBTs with depletion mode SiC vertical junction field effect transistors (VJFETs) in a commercial motor drive in current production. A Yaskawa A1000 CIMR-AU4A0088FAA motor drive was analyzed and found to have reliability and safety features that can be exploited to introduce normally on SiC transistors with no loss in safety or reliability...
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...
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