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Li Ion batteries are the proficient energy source for powering Hybrid Electric Vehicles (HEV) due to its smaller size, lighter weight, and improved charge efficiency without memory effect. The battery pack constitutes of a combination of cells in series and parallel configurations. Due to cell impedance mismatch, each cell possesses different potentials which cause different State of Charge (SOC)...
A novel modification to Z-Source DC circuit breakers has been proposed to reduce power consumption from its predecessor significantly. The power thyristor serves as the means of circuit isolation and voltage blocking in the event of a fault in traditional Z-Source DC circuit breakers. However, Z-Source circuit breakers direct full load current through the Thyristor. The resulting voltage difference...
This paper analyzes the performance of three different topologies namely parallel, serial and variable-structure circuit of switched-diode-capacitor voltage accumulator (SDCVA). The converters are modelled in MATLAB/Simulink environment. Simulation is carried out to investigate the performance of the converters and the results are discussed. The optimum topology is identified based on the voltage...
This work develops a systematic state-space approach to modeling of an improved buck-boost DC-DC converters. The averaged model of the converters is analyzed. Based on this model, a control law is design to keep the output voltage stable when the input is unstable. The simulation results are presented to confirm the capability of the converter to keep the output voltage stable. The proposed converter...
This paper presents a single-stage non isolated switched capacitor ac-dc converter for power factor correction (PFC). This converter features reduced passive components, single switch, transformer less high voltage gain, and improves the power factor, reduces THD and voltage stress across the switch. The peak current mode with dynamic resonant perturbation (DRP) scheme compensates the sub harmonics...
Simulation times of electric circuits containing switching power supplies not only depend on the algorithms used for solving the network equations but also on the choice of the time-step-control strategy. While generic simulation packages use the estimated truncation error to find the optimum time step, in this work a more specialized approach was followed. After studying the analytic solution and...
DC-DC converters form an essential component of modern low-power integrated circuits. This paper presents a novel nonlinear modeling technique for pulse-width modulated (PWM) DC-DC converters for low-power applications. Our enhanced model not only predicts the dc response, but also captures harmonics of arbitrary degrees. The proposed full-order model retains the inductor current as a state variable...
This paper presents design and analysis of dual input SEPIC converter. Time sharing switching scheme is used to generate the gating pulses for switching devices. This scheme is more flexible as it provides wide range and choice of input sources. Instead of using two single input converters for different power supplies, the use of a dual input SEPIC reduces the cost and losses. The results of output...
A novel Impedance Generation Circuit is proposed in this paper and is also implemented. The need for this is the lack of availability of such a device in the market at an affordable price and also the versatility it provides. Decade boxes such as DRB, DCB or DLB use switching of the corresponding passive elements (R, C, L variations) whereas the device proposed in this paper uses only variations in...
This paper presents a Ka-band high isolation single-pole-double-throw (SPDT) switch using 0.13μm CMOS process. The switch has a measured insertion loss of 2.7–3.7 dB and an input 1-dB compression power (P1dB) of 8 dBm at 35 GHz. Via using the shunt NMOS topology and high quality factor match networks, 33–50 dB measured isolation is obtained within the frequency range of 30–45GHz. The switch core occupies...
A novel isolated zero-voltage-transition (ZVT) boost converter with coupled inductors is proposed in this paper to satisfy the high power, high step-up and isolated requirements. In the proposed converter, the input-parallel configuration is adopted to share the large input current and to reduce the conduction losses, while the output-series structure is employed to double the output voltage gain...
This paper presents a CMOS integrated interface circuit for piezoelectric energy harvesters (PEH). A fully self-powered circuit, based on Synchronous Electric Charge extraction (SECE) technique, is implemented for non-resonant piezoelectric harvesters generating low power, in 10s to 100s μW range. The circuit is realized in standard 180 nm UMC CMOS technology. A switch control circuit is designed...
This work proposes a non- isolated high voltage gain DC-DC converter based on three state switching cell and voltage multiplier cell. The no of multiplier cell to be implemented in this proposed circuit is 5.The value of the voltage gain obtained can be varied by changing the no of multiplier cells & duty cycle. Non - isolated DC-DC converter based on 3SSC and 3VMC is simulated which precedes...
In this paper, a planar inductor based snubber circuit is presented for power MOSFET devices used in a Boost power converters. The proposed snubber can control the EMI effects caused by the switching actions which can affect the drive circuit. Appropriate use of the snubber and considering the parasitic elements in the switching circuits can improve the conducted EMI of the converter, eliminating...
A generic behavioral average-circuit model that analyzes hybrid converters that include a switched inductor and switched capacitors is developed. The model can be used to calculate or to simulate the average static, dynamic and small signal responses of hybrid converters. The model is valid for all operation modes of the Switched Capacitor Converters operating in CCM and DCM modes of the Switched...
This paper present a detailed study of performance of two the most commercially available IGBT for International Rectifier and IXYS e.g. IRGBC40 (S, F,U) and IXGH40N60A, when subjected to two such stressful conditions short circuit operation and unclamped inductive switching and it takes into account specific phenomena limiting its SOA (Safe Operation Area), avalanche, second breakdown as well as...
This paper presents a new approach called parallel inductor synchronized switch harvesting to harvest electric energy from a mechanical excited piezoelectric element. Based on the criteria energy harvesting circuit, this new parallel inductor synchronized switch harvesting circuit was constructed and explained. The theoretical model of output electric energy for this new circuit was derived and a...
A bridgeless Power Factor Correction (PFC) circuit based on Cuk converter is proposed in this paper. The operation during each sub-interval modes of the converter operated in Discontinuous Conduction Mode (DCM) is discussed. The small-signal and large signal models are presented using Current Injected Equivalent Circuit Approach (CIECA). PLECS/Simulink is used to verify the capability of the proposed...
Conventional dc--dc converters are unable to provide very high step-down conversion ratio due to the inherent limitation of power switches and rectifier diodes in turning on and off instantaneously. Since utilization of transformers to make high conversion ratio imposes efficiency obstacle, more efficient transformerless converters have been proposed. With transformerless hybrid converters high step-down...
The Cúk converter operating in discontinuous capacitor voltage mode (DCVM) inherently benefits from PFC features as unity power factor can be achieved by using a constant duty cycle and switching frequency. In this paper, the switch network modeling technique is applied to the Cúk converter operating in DCVM in order to develop its small-signal model under the assumption that it is fed by a dc voltage...
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