Design Of A Single Phase Unity Power Factor Switch Mode Power Supply (SMPS) With Active Power Factor Correction [TK7881.15. N335 2008 f rb].

Pembekal kuasa mod pensuisan (SMPS) merupakan satu industri yang bernilai jutaan ringgit dan berkembang pesat dalam bidang elektronik kuasa. The Switch Mode Power Supplies (SMPS) are a multi-million dollar industry and continuesly growing industry within the field of power electronics

STUDY OF HIGH LOAD CURRENT POWER SUPPLY DESIGN FOR LOW FREQUENCY SEABED LOGGING APPLICATION

Low frequency, high load current study is very important for Seabed Logging (SBL) application. SBL is currently an emerging method to find hydrocarbon layer beneath the ocean floor. In SBL, a high current low frequency power supply is needed to assist the transmission process that uses Horizontal Electric Dipole (HED). HED emits electromagnetic signal throughout the sea in the expected area containing hydrocarbon layer. This power supply with the ability to produce high current low frequency output is essential for the transmitter to transmit the signal required to the targeted area and its surrounding, and for the receivers to receive back the signal containing accurate data required. In this project, the processes to design and simulate a power supply with the required output for SBL application is explained in details. At the end of this project, a power supply which has high current and low frequency output is completely designed

ASDTIC control and standardized interface circuits applied to buck, parallel and buck-boost dc to dc power converters

Versatile standardized pulse modulation nondissipatively regulated control signal processing circuits were applied to three most commonly used dc to dc power converter configurations: (1) the series switching buck-regulator, (2) the pulse modulated parallel inverter, and (3) the buck-boost converter. The unique control concept and the commonality of control functions for all switching regulators have resulted in improved static and dynamic performance and control circuit standardization. New power-circuit technology was also applied to enhance reliability and to achieve optimum weight and efficiency

A Single-Stage LED Driver Based on ZCDS Class-E Current-Driven Rectifier as a PFC for Street-Lighting Applications

This paper presents a light-emitting diode (LED) driver for street-lighting applications that uses a resonant rectifier as a power-factor corrector (PFC). The PFC semistage is based on a zero-current and zero-derivative-switching (ZCDS) Class-E current-driven rectifier, and the LED driver semistage is based on a zero-voltage-switching (ZVS) Class-D LLC resonant converter that is integrated into a single-stage topology. To increase the conduction angle of the bridge-rectifier diodes current and to decrease the current harmonics that are injected in the utility line, the ZCDS Class-E rectifier is placed between the bridge-rectifier and a dc-link capacitor. The ZCDS Class-E rectifieris driven by a high-frequency current source, which is obtained from a square-wave output voltage of the ZVS Class-D LLC resonant converter using a matching network. Additionally, the proposed converter has a soft-switching characteristic that reduces switching losses and switching noise. A prototype for a 150-W LED street light has been developed and tested to evaluate the performance of the proposed approach. The proposed LED driver had a high efficiency (>91%), a high PF (>0.99), and a low total harmonic distortion (THD i <; 8%) under variation of the utility-line input voltage from 180 to 250 V rms . These experimental results demonstrate the feasibility of the proposed LED scheme

Power Converter Possessing Zero-Voltage Switching and Output Isolation

A modified boost converter accomplishes power transfer to a load with an electrical isolation, a zero-voltage and a zero-current switching, a transformer core resetting mechanism, and component stresses identical to those in the conventional boost converters. The power converter contains two switching devices, a main one connected in parallel and a secondary one connected in series with a transformer primary winding. A secondary winding of the transformer is connected through an output rectifier to the load. Zero-voltage switching and proper transformer-core resetting are achieved from the resonance that exists between the parasitic capacitance of the secondary switching device and the magnetization inductance of the transformer. A transformer leakage inductance facilitates zero-current switching; thus, reducing the recovery time and current in the output rectifier, and the turn-on switching loss in the conventional main switching device. The switching converter contains a lossless cl

An Update on Power Quality

Power quality is an important measure of fitness of electricity networks. With increasing renewable energy generations and usage of power electronics converters, it is important to investigate how these developments will have an impact to existing and future electricity networks. This book hence provides readers with an update of power quality issues in all sections of the network, namely, generation, transmission, distribution and end user, and discusses some practical solutions

Low-power PFC and forward converters : methods to improve performance

The number of power electronic appliances is growing. Power electronic converters can be used to convert the ac line voltage to a dc voltage, and further through dc-dc conversion stages to desired dc voltages for different loads. This Thesis deals with three single-stage power factor correction converters and a forward type dc-dc converter. Single-stage converters can be considered as low cost solutions for power factor correction. This is because only one active switching stage is used in the converters. Small signal and steady state analysis are performed for the dither converter. A resonant type snubber is analyzed for the BIFRED and BIBRED converters and a new type of clamp circuit is developed for the BIFRED converter. The dc-dc conversion part of the Thesis deals with a forward converter with active clamp circuit and self-driven synchronous rectifiers. Resonant transition of the converter is analyzed in detail. Emphasis of the research is on improving the efficiency of the converter. Findings show that the minimization of the turn-on losses in the converter is not necessarily advantageous. The analysis is verified with a 3.4 V and 30 A prototype converter.reviewe