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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 wireless sensor node makes use of energy harvesters in order to power its modules. However, by nature of these nodes being placed in diverse locations and fluctuating conditions, their energy harvesters obtain unregulated DC voltage. Regulators undertake this problem by appropriately handling the voltage being harvested to power the node. Most regulators today use analog control methods which...
The modular multilevel cascaded converter (MMCC) has been considered as a promising solution for integrating the utility-grade renewables to the medium-voltage (MV) power system. However, the implementation becomes difficult with the centralized control architecture as the cascaded numbers increase. This paper presents a distributed control technique for the cascaded converter, which significantly...
A novel positive to negative voltage converter and a novel LDO regulator are proposed in this paper. Compared with the conventional voltage converter, the proposed one has a higher efficiency for a certain process. The novel negative voltage LDO circuit has a good temperature characteristic with a simple and chip-saving control circuit. The proposed whole circuit is verified with simulation in CSMC...
A step-up low dropout voltage regulator for a selfpowered glucose biosensing system is designed for energy storage and delivery purposes. The self-powered glucose bio-sensing system consists of a glucose biofuel cell that is capable of producing micro-watt power and delivering ∼400 mV peak-voltage, or nominally 350 mV. This generated micro-power and voltage is not adequate to drive low-power microelectronic...
An ultra-low power regulated charge pump system based on charge recycling between a tank capacitor and the charge pump output load capacitor is presented. The proposed circuit is implemented using a 55 nm UMC High Voltage CMOS technology with a power supply of 1.2V. Simulation results show a maximum current reduction of about 38% compared to a conventional regulated charge pump system. Rise time until...
Recently, the penetration of solar photovoltaic (PV) systems in Low Voltage (LV) distribution feeders has significantly increased and is expected to increase further in the coming years. Variability in solar PV output and high R/X ratio of LV distribution feeder results in voltage fluctuations. Local distribution companies (LDCs) rely on load tap changing transformers or feeder voltage regulators...
The paper proposes a power supply unit to efficiently supply always-on or duty-cycled IoT loads which consumes in μW-range. This PS achieves the highest 93% and 99% current efficiencies at average output currents of 1μA and 100μA to date, respectively. This unit includes a voltage reference and oscillator to generate autonomously duty-cycled power delivery operation as low as a 30μ8 on-period. The...
The stacking MOSFET structure composed of low-voltage devices suffers from deteriorated transient response or large footprint area when capacitor-free or dominant pole compensation low dropout (LDO) regulator biases the driver. Due to self-stabilized feature, the proposed stacking MOSFET driving (SMD) technique effectively drives the power stage and greatly reduces noise interference from the noisy...
This paper develops coordinated voltage control with high penetration of wind in power distribution systems. In the proposed method, daily schedule of optimal voltage profiles are determined by using optimization technique based on predicted values of load demand and by controlling tap positions of regulators, switched capacitors, and reactive power outputs of the inverters. In this paper, three optimal...
This brief paper is focused on the systematic design method towards active two-terminal circuit elements which itself allows four branch independent regulation type PIαI1I1+α where mathematical order αε(0, 1), voltage is driving force and current being response. Synthesis is based on matrix method of unknown nodal voltages with prescribed form of admittance matrix. Few topologies have been derived...
This paper shows the modeling of a linear-assisted or hybrid (linear & switching) DC-DC converters. In this kind of converters, an auxiliary linear regulator is used, which objective is to cancel the ripple at the output voltage and provide fast responses for load variations. On the other hand, a switching converter, connected in parallel with the linear regulator, allows to supply almost the...
A fully integrated low-dropout (LDO) regulator with fast transient response is proposed in this paper. The capacitor-less LDO (CL-LDO) regulator incorporates both assisted pass-transistors and control circuit to realize adaptive transient current distribution during the load current transition, thereby enhancing the transient response and minimizing the output voltage's spike. In 65-nm CMOS process,...
Supercapacitor-based DC-DC converters can be built with end-to-end efficiencies of more than 80% and have eliminated EMI/RFI issues with operating frequencies ranging from tens of hertz down to a few millihertz. Multistage topologies can improve temporary energy storage capability by buffering against short-term failures of the power supply. This paper presents an analysis of a supercapacitor-based...
The optimization approach to design of linear voltage regulators for system on chip is proposed. The approach allows to find capacitances of a regulator under constraints on performance metrics. The optimization subsystem is described and an illustrative example is given.
Startup is known as the most critical phase of any power electronic converter. Uncharged capacitors and resonance circuits cause high current spikes during startup that reduce the lifespan of semiconductors or in the worst case, immediate break down. Although the startup of power electronic converters is a very practical and necessary topic, only few papers cover different startup algorithms. No papers...
This paper develops a mathematical model for optimal capacitor placement and sizing in radial distribution systems. The optimization model finds placement and sizes of capacitors considering variations on load profiles with 15-minute resolution. A recently developed heuristic algorithm, Moth-flame Optimization Algorithm, is modified and used to solve the model. Optimization model is tested on a modified...
This paper presents a fully integrated low-power 0.18 μm CMOS Low-Dropout (LDO) voltage regulator for battery-operated portable devices. A single stage high-gain folded cascode-compensated amplifier is used to attain good static performances, while thanks to a very simple dynamic bias circuit, transient performances are significantly enhanced. Results validate a 1.2 V output voltage from a 3.3 V to...
This paper presents an output-capacitorless low-dropout (LDO) regulator with with −132dB power supply rejection ratio (PSRR) at 1KHz. By using a Rising-Class-A voltage buffer, the non-dominant parasitic poles can be pushed to higher frequencies and leads to good stability in power supply rejection ratio (PSRR) performance. The proposed circuit is designed with 0.18-µm CMOS process technology. The...
This paper discusses the ability to generate energy from the human body without using any external power source by using a piezo-element sensor. The replacement procedure of the batteries in implantable medical devices may apply risk to the patient's life, to avoid this risk many methods exist one of them is proposed in this work. The piezo-element is designed to be attached into the patient's shoes...
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