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A low-input-voltage, highly efficient single-inductor-dual-output (SIDO) boost converter fabricated in 0.18 μm CMOS process is presented for thermoelectric energy harvesting. Two key technologies are implemented to accept input voltage down to 20 mV and to achieve 69 % conversion efficiency at 100 mV, which is the highest conversion efficiency reported to date for such a device. The first key is a...
In this paper, a novel ac/dc converter is proposed for low voltage, low power rectification applications. The proposed converter manages the energy harvested from micro-scale electromagnetic transducers. It integrates the conventional Boost and Buck-Boost topologies with a shared inductor, a bidirectional switch and two split filtering capacitors. The Boost and the Buck-Boost topologies function in...
This paper proposes a new single-input three-output DC-DC buck converter. The proposed topology has two less switching devices than that of a conventional converter. This reduction in switching devices results in lower cost and a more even distribution of power losses among the switching devices. A comprehensive small signal Modeling and control strategies for the proposed converter will be presented...
Novel input-parallel output-parallel (IPOP) DC-DC converter with maximum power point tracking (MPPT) technique is presented in this paper, which consists of two cascaded stages including buck-boost and isolated boost, so as to achieve high voltage gain and galvanic isolation at proper duty ratio and low leakage energy. Using proposed DC-DC converter, multiple distributed generators (DGs) can be connected...
Todays, the pulsed power systems have been employed in many applications. To meet the requirement of user, the pulse generator should enjoy the advantages of compactness, high flexibility, high pulse repetition rate and cost efficiency. Among all of converters that can be used to generate high voltage pulses, capacitance diode voltage multiplier (CDVM) is a good candidate to meet the mentioned requirements...
Recent advances in solid-state semiconductors have led to the development of medium-voltage power converters which could obviate the need for the step-up transformers of renewable power generation systems. The modular multilevel cascaded converters have been deemed as strong contenders for the development of medium-voltage converters, but it requires multiple isolated and balanced dc supplies. In...
Using effective and harmless methods to remove contaminants from the environment and water resources have been considered by many researchers. Among the modern methods, corona discharge for creating free radicals and ozone, which is a strong and unstable pollution treatment, is the best method. The corona discharge is created by applying narrow high-voltage pulses by pulsed power generators on two...
High voltage pulse generators can be used effectively in water treatment applications, as applying a pulsed electric field on the infected sample guarantees killing of harmful germs and bacteria. In this paper, a new high voltage pulse generator with closed loop control on its output voltage is proposed. The proposed generator is based on DC-to-DC boost converter in conjunction with capacitor-diode...
A novel adaptive off-time (AOT) technique, which is applicable to the circuit design of an AC-DC constant-current LED driver using hysteresis-current control method, is proposed in this paper. The AOT is achieved by a novel off-time control method, which is based on the combination of peak-current-loop and error sample feedback-loop, to solve the problem that peak current is not consistent with average...
Today's combustion engines have low efficiency and a large amount of useful energy converts to heat as waste in different type of vehicles. Improving the dynamics of the car body, injection system, the shape of the internal engine components and manipulating the fuel compositions have had influence on fuel economy, but still less than 50% of energy in the fuel is converted to useful mechanical power...
Marx generator is an impulse source used for testing of various equipments. High voltage DC source is input to Marx generator. Traditionally, DC sources used for Marx generator were of large size but now due to advancement in solid state devices it is possible to reduce size and weight of DC source. This paper explains the designing and simulation of 30 kV solid state DC source to Marx generator....
The basic concepts for the power semiconductor magnetic-pulse devices effectiveness improving are described. The concepts are based on both own R&D summarized experience and previously known approaches. The paper includes several custom solutions and the most typical designs from available sources, such as: charging-storing nodes, impulse-compression nodes, power switches, which are altogether...
This paper proposes a novel bipolar high-voltage Marx pulse current generator for inductive load. The paper first analyzes the feasibility and design parameters of the proposed design, and then elaborates the structure design and optimization. IGBT modules build up the 10-stage Marx adder, and the capacitor in each stage is charged by series-parallel resonant voltage converter. A novel compensation...
This paper presents a new solid-state step-up resonant Marx modulator (S3RM2) with a continuous output current for offshore wind energy applications. The developed topology is based on the Marx generator concept, where magnetic switches are replaced by solid-state switching devices. The proposed converter is characterized by resonant switching transitions to achieve minimal switching losses and maximum...
This paper presents a medium-voltage power converter system for the Wave Dragon ocean energy conversion platform. The proposed converter configuration is an alternative to the classic back-to-back low voltage converter implemented in the original prototype. The converter configuration merges several diode rectifiers with boost converters operating with low voltage at the generators side, with a single...
A framework has been developed and implemented in prototype form to allow National Grid Control Centre engineers to have direct access to a fully automated security constrained optimal reactive power flow process. Confidence in the usability and potential of reactive power optimization technology has been established. The framework presented in this paper includes novel shunt switching logic implemented...
Low power devices promote the development of micro power generators (MPGs). There is an increasing interest in harvesting ambient vibration energy through piezoelectric means by which one can potentially draw 10–100's of μW of available power. The limitations of existing piezoelectric harvesters is in their interface circuitry consuming large power and also large amount of charge getting wasted in...
This paper describes a new hysteretic buck converter including a differentiator and an adaptive hysteresis window control. Differentiating the feedback signal achieves ultra-fast switching of the proposed buck converter. The adaptive hysteresis window control allows a monotonous operation with predictable noise spectrum, and gives way to efficient design for variable supply and output voltages. The...
The proposed interleaving power factor correction (PFC) can effectively reduce the size of the AC-DC converter for portable electronics. Fully integrated variable sampling slope (VSS) technique can provide precise phase regulation under variable line voltage. Besides, the no-deadtime ramp generator (NDRG) records the previous status to modify the sequent on-time value to achieve current sharing for...
Presently most of the researchers are working towards generating more energy from resources that can be cost effective and do not contribute to climate change or have adverse environmental impacts. One recent promising renewable energy power source is the Piezo-electric Generator (PZG) that extracts energy from mechanical vibrations. Due to low power and wide-range ac output voltage, the Piezo-electric...
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