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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...
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...
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...
More and more power electronics applications utilize GaN transistors as they enable higher switching frequencies in comparison to conventional Si devices. Faster switching shrinks down the size of passives and enables compact solutions in applications like renewable energy, electrical cars and home appliances. GaN transistors benefit from ∼10× smaller gate charge QG and gate drive voltages in the...
Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses...
Switched-capacitor based regulator has its unique usage in various power management applications where both small foot print and flexible current capability is required since the switched-capacitor power stage is scalable with current rating and thus opens possibility of fully on-chip implementation whereas inductor based regulator is very limited by inductor size due to the only availability of off-chip...
This paper proposes a DC-DC converter for ultra-low power battery management. The proposed circuit consists of a switched capacitor converter (SCC) and self-biased linear regulator (SBLR). The SBLR monitors an output load current and controls the switching frequency of the SCC to achieve both ultra-low stand-by power and wide load current capability. Measurement results demonstrated that the converter...
Startup of any converter is a very dynamic and hardly controllable process. The regulator outputs are fluctuating, sensor readings are constantly changing and the fault probability is the highest. That is especially true for grid connected converters that need to be exactly in phase with the grid before an actual connection is done. In this paper a startup strategy for a grid connected PV micro inverter...
By combining a switched-capacitor cell with a switched-inductor cell, a new passive switching cell is defined. It is inserted in basic converters to get step-up regulators providing a large dc gain as required in applications powered by environmental-friendly sources of energy. Simulation and experiments show the superiority of the proposed converter compared with available solutions with the same...
The power supply is one of the major challenges for applications like internet of things IoTs and smart home. The maintenance issue of batteries and the limited power level of energy harvesting is addressed by the integrated micro power supply presented in this paper. Connected to the 120/230 Vrms mains, which is one of the most reliable energy sources and anywhere indoor available, it provides a...
In the paper a new type of AC voltage regulators with switched capacitors is proposed. Main factor in developing of new converters became reduction of number, either semiconductor switches or reactive elements. Considered converters are buck-boost with sinusoidal input and output currents. These converters are characterized by lower value of specified capacitors reactive power and great control range...
In smart grid environment, Volt/VAr Optimization (VVO) is receiving great attention among other energy efficient techniques. The main concept of VVO is to utilize various Volt/VAr Control (VVC) and supporting devices in an optimal way for the purpose of minimal losses and maximum energy savings. However the care has been taken so that power quality of end-use customer will not be affected while satisfying...
Design of high performance power supply for acoustic shock acquisition system is discussed from the perspective of engineering practice of acoustic shock acquisition system. In this connection, design of multi-output power is proposed based on switching regulator. Moreover, by analyzing key components, the problem of high ripple with switching regulator is successfully solved, while power supply efficiency...
AC voltage regulators with or without a transformer review is provided. Several research directions by creation of new AC-AC converters are distinguished, such as voltage stabilization, voltage regulation to nominal values and also increasing of voltage with gain greater than unity, reactive power compensators, active filters, voltage dips and overvoltage compensators and soft start of electric motors...
This paper proposes a novel method for ripple cancellation in multi-phase converters. Unlike the conventional multi-phase converter, the proposed topology can cancel the ripple irrespective of the duty ratios. The proposed topology is designed to give 3.3V output for wide supply range of 4.5 to 18V and load range of 0 to 3A in AMS 0.35um high-voltage CMOS process. Transistor level simulation results...
This paper presents an efficient thermal energy harvesting IC (EHIC) that supports a battery-less μWatt system-on-chips. The EHIC consists of an inductor-based DC-DC converter that boosts a low input voltage to a suitable output voltage level. Further, a switched capacitor buck converter is utilized to regulate the boost converter output voltage and to support multiple output voltage levels, namely...
In this paper, a multiple output switched capacitor (SC) DC-DC converter with capacitor sharing technique is proposed for event-driven energy-efficient sensor-fusion platforms. The converter is able to convert 1.2V supply voltage to five different output voltages ranging from 0.44V to 2.2V to power different building blocks in the system. A part of the flying capacitor can be shared between five SC...
This paper presents the first monolithically integrated two-phase series capacitor buck converter. This converter achieves over 60 A/cm3 current density. The series capacitor buck converter topology enables high frequency (HF) operation up to 5 MHz per phase without special magnetics or compound semiconductors. An adaptive constant on-time controller provides fast load transient response and fixed...
This paper details efficiency analysis and characteristics of a gyrator resonant switched-capacitor converter (GRSCC) operating as a voltage regulator. Following the efficiency analysis, this paper introduces an optimal size-efficiency design procedure for IC realization of the converter. In area-sensitive applications, the optimization method combined with the converter's benefits present an attractive...
Wide input rails (12V to 100V) are common in today's automotive and industrial systems. Miniaturized DC-DC voltage regulators (VRs), which can provide a low-voltage regulated output from a wide input range and deliver a few Watts, are essential in these systems. Wide-input-range integrated VRs, however have difficulty to simultaneously achieve high frequency (HF) operation and high power efficiency...
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