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The paper proposes a generalized circuit configuration of a new multilevel current-source inverter (CSI) with no-isolated switching devices. In this new multilevel inverter topology, all of the power-switches in the inverter are connected on a common-potential level. Hence, all of the power switches only need a single gate drive power supply without using isolated power supplies or conventional bootstrap...
Because of the renewable energy generation (for example wind and photovoltaic) becomes a new research hotspot, people pays more attention to the problem of power fluctuation of wind/PV (photovoltaic) generation as the wind velocity and solar insolation intensity are intermittent and unpredictable. To solve the problem, this paper introduced superconducting magnetic energy storage (SMES). Compared...
An integrated sigma-delta noise-shaped buck converter that uses a discrete-time second order single-bit sigma-delta modulator (DT-SDM2) is presented. The DT-SDM2 buck converter and a compared PWM controller are designed and fabricated on a standard TSMC 0.35 ??m 3.3 V CMOS process. The operating frequency of the proposed DT-SDM2 ranges from 400 KHz to 1.2 MHz. Simulation results show that DT-SDM2...
Electric Power Steering (EPS) has important significance in improving the auto's dynamic and static performances. This paper deals with the mathematical model and characteristic curves of EPS System. First, the principle and structure of EPS are discussed. Then the characteristics of EPS system are analyzed, including the typical power curves which deal the relationship of the assist torque and the...
This paper presents power loss analysis of grid-connection PV systems, based on the loss factors of double line-frequency voltage ripple, fast irradiance variation, fast dc load variation, non-uniform solar cell characteristic, and limited operating voltage range. These loss factors will result in power deviation from the maximum power points (MPP). In the power loss analysis, both single-stage and...
A series-resonant single-phase step up/down ac chopper is presented. The main attribute of the ac chopper topology is the fact that it generates an output ac voltage larger or lower than the input ac one, depending on the instantaneous duty-cycle. This property is not found in the classical ac chopper, which produces an ac output instantaneous voltage always lower than the input ac voltage. The presented...
A novel cost-effective and high-efficiency single-switch resonant inverter with power-factor-correction (PFC) scheme is proposed to drive a piezoelectric ceramic transducer (PCT) for an ultrasonic cleaner. The circuit topology is derived by integrating a flyback converter served as PFC stage with a class-E resonant inverter for driving a thin PCT at its resonance frequency. A unity power factor is...
This paper presents design and implementation of a bi-directional inverter, including a high frequency transformer, a push-pull switch configuration at the dc side, a cycloconverter at the ac side, and a dsPIC controller. The dc/ac conversion is achieved with a phase-shifted control strategy. In addition, this topology also can achieve an ac/dc conversion with the PFC function. In this circuit, the...
In recent years there has been much attention on the proportional plus resonant (P-R) current regulators for grid connected voltage-source converters (VSCs). Many strategies have been proposed for use of P-R controllers both in the stationary and in the synchronous reference frame that demonstrate VSC performance can be improved under non-ideal supply conditions such as supply asymmetry and supply...
This paper investigates the existing structures of transverse flux machines (TFMs) that can be constructed as an outer rotor in-wheel motor which is suitable for low speed applications. As the main characteristic of TFM is providing the best torque density at low speeds, it would be a suitable choice and having a great future for low speed mobile platforms. Different structures of TFM are re-designed...
A soft-switching converter with dual resonant structures is presented in this paper. The dual resonant tanks are composed by the leakage inductors and resonant capacitors to achieve zero-current-switching (ZCS) turn-off mechanism for diodes at the secondary side of transformer. Moreover, the voltage stresses of power switches are clamped by the active clamp circuit at the primary side of transformer...
A parallel zero voltage switching (ZVS) forward converter with half-bridge topology is presented in this paper. Two converter modules are connected in parallel in the output side to share the load current. In the primary side, two converter modules use the same power switches so that the semiconductor devices are reduced in the proposed converter compared with the conventional interleaved half-bridge...
This paper proposes a novel single-stage high-power-factor electronic ballast for metal halide lamps. By integrating two buck-boost typed power-factor-correction converters, a full-bridge inverter and a bidirectional buck converter, a single-stage electronic ballast with symmetrical circuit topology is derived. The circuit component count can be effectively reduced and circuit energy-conversion efficiency...
Design of DC power supply using half bridge LCC series-parallel resonant converter is proposed in this paper. The DC power supply input voltage is DC 24 V and output voltage is DC 3.3 V. The voltage regulation using variable frequency control is investigated for 3.3 V under different load condition. The performance of the system is first simulated by IsSpice. A 16-bit digital signal processor (DSP...
This paper presents a 3-phase, 400 W, 14000 rpm, 2-pole/3-slot non-overlapping windings PM motor. In the design of the motor, Taguchi parameter method coupled with the finite element method (FEM) analysis is employed to minimize the level of cogging torque and maximize the efficiency of the motor. A mechanical analysis is carried out to investigate the mechanical feasibility of the rotor due to high-speed...
This paper investigates a high voltage pulse driver for driving carbon nanotube field emission lamp (CNT-FEL) based on a two-switch flyback topology. The proposed driver incorporates an energy recovery circuit to feedback the excess energy to DC bus, thus eliminating the arcing phenomenon caused by the traditional DC driving and improving the system efficiency. Analytical modeling, complete design...
The paper proposes an adaptive sliding observer to accurately estimate the rotor position for a direct-drive permanent magnet synchronous generator (PMSG). Without any position sensor, the generator torque and flux responses retain high performance both in the steady state and during transients. The problem on the shaft encoder installation difficulty, reliability and disturbance in encoder cable...
This paper presents a design methodology for sizing a preliminary design of a switched reluctance machine. The proposed method combines the use of genetic and fuzzy algorithms together to simplify the design method. Genetic algorithms (GA) are utilized for handling a multiple objective problem, whereas fuzzy algorithms (FA) simplify a definition of fitness evaluated functions for GA. Knowledge of...
In this paper, a novel high-voltage generator-Homopolar Inductor Alternator (HIA) pulse-charge for the capacitor bank with repetitive frequency though inertial energy storage system has been designed. A diesel engine provides energy as a prime motor in this system, and then drives the HIA to the rated speed by the flywheel energy storage device, the AC pulse-charge for the capacitor bank with repetitive...
The design of a 1 MHz regulated multi mode charge pump using IBM7RF technology is described in this paper. This charge pump converts 2.7-4.5 V input voltage to a regulated 5 V output. The power stage includes nine PMOS switches and one NMOS acting as a controlled current source with 50% duty cycle. Together with three flying capacitors and the output capacitors, the converter can work in 2??, (3/2)??...
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