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This paper presented a high performance DC power supply system with high input power factor. The presented DC power supply system provides the input current with low current distortion on the ac input side and the stable output dc voltage with low ripple voltage on the dc output side. The presented DC power supply system only uses four active switches to correct power factor in input side and regulate...
This paper proposed a boost power factor correction (PFC) controller with feedforward adaptive on-time control designed and fabricated using TSMC 2P4M 0.35μm CMOS process. With feedforward adaptive on-time control the proposed controller can reduce total harmonic distortion (THD) in wide input range by detecting input voltage and adjust the on-time of boost power stage. To achieve high efficiency,...
A burst dimming controller with primary-side control for electrodeless fluorescent lamp (EFL) electronic ballast is implemented in this paper. The used main circuit is a class D topology with a resonant circuit to form a resonant inverter. Moreover, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start, burst dimming, and primary-side control feature....
A microcontroller-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model,...
This paper proposed a single-stage resonant buck-boost ac voltage regulator. The proposed regulator can output a voltage which is larger or lower than the input ac one and is dependence on depending on the instantaneous duty-ratio. This property is not found in the conventional single-stage ac voltage regulator that the ac output instantaneous voltage is always lower than the input ac voltage. The...
In this paper, A MCU-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented. The used two stage system consists of a power factor corrector and a class D resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve digital control feature. Moreover, we not only discuss the lamp model, derive the frequency characteristics,...
An impulsed-power supply used to eliminate arcing phenomenon and to maintain lamp luminance for field emission lamp is presented in this paper. To compact the system configuration and to reduce the system cost, the flyback topology is employed as the main circuit. Next, the phase-locked loop technique is embedded as a feedback mechanism in this study. With the proposed control mechanism, the peak...
This paper explores a fast charger based on microcontroller for LiCoO2 battery module. The main structure of the proposed system is the power factor corrector with a full-bridge phase-shift converter, its power factor upgrade close to 1.0, as well as to change the charging strategy according to the battery module's state of charge. Furthermore, the full-bridge phase-shift converter control chip communicates...
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...
This paper presents an Improved PSO Algorithm (IPSO) to solve the problem of optimal Phasor Measurement Unit (PMU) placement. The aim of Optimal PMU Placement problem is to guarantee both full observability of the power grid and minimal number of PMU. In the Improved PSO Algorithm, the point of genetic algorithm and simulated annealing process is involved into basic particle swarm optimization. To...
In order to research an altitude's effect on corona onset voltage of bundle conductors in a corona cage, a calculation model was established, and corresponding test proceeded. The charge simulation method was adopted to calculate space electric-field strength. According to self-sustained discharge criterion in a severe nonuniform electric field, and variation of altitude, the corona onset voltage...
An impulsed-power generator, which possesses low cost and simple configuration, operated in discontinuous conduction mode (DCM) for driving a tubular field emission lamp (TFEL) is presented in this paper. The proposed system based on flyback topology can provide impulse power driving to eliminate the arcing phenomenon caused by the traditional DC voltage driving. Therefore, both the lighting performance...
This paper analyses and designs a new soft-switching single-phase high power factor voltage-doubler rectifier. The proposed rectifier combines the conventional pulse-width-modulation technique, soft commutation technique and instantaneous average line current control to promote the circuit performance. Comparison with conventional boost rectifier, the proposed rectifier own double voltage function...
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...
A flyback converter incorporating an energy recovery circuit is proposed to generate high voltage pulses for driving carbon nanotube field emission lamp (CNT-FEL). The employed energy recovery circuit will not only eliminate the arcing phenomenon caused by traditional DC driving, but also recover the excess energy to DC bus so as to improve the system efficiency. In this paper, we construct an equivalent...
A high voltage full-bridge resonant inverter is proposed for driving carbon nanotube field emission lamp (CNTL). First, we construct an equivalent model of CNTL to exhibit its electric characteristics. Moreover, the high frequency sinusoidal driving strategy is employed to eliminate the arcing phenomenon caused by the traditional DC driving. And then the PLL feedback controller is used to stabilize...
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