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A three-phase variable-frequency inverter using PWM technique has been designed and constructed in which the notch positions are optimized to eliminate a fixed number of harmonics. The control circuitry designed to generate optimum notch positions uses digital techniques contrary to analog modulation techniques used in classical PWM which results in less harmonic distortion in the output waveform...
In this paper, an uninterruptible power supply (UPS) system using a current source inverter is proposed. A single phase and a three phase load commutated current source inverter suitable for this UPS system is presented. The load commutation is achieved by selecting the output filter to maintain a net leading power factor at the inverter output over the operating load range. A steady state analysis...
A new high performance class of line voltage regulators is introduced for application to computer and other communication type loads. It utilizes thyristors to smoothly buck or boost the input voltage to the proper level to compensate for variations in input voltage or load, and maintains plus or minus 1/2% output voltage regulation. Correction to within 5% of normal voltage is possible within 1 cycle...
This paper is mainly concerned with the latest strong technological developments on high-power fast-response switching dc-dc converters controlled by time-sharing/sequencial high-frequency thyristor resonant chopper comprising energy-storage and-transfer reactor assemblies, which can operate over an ultrasonic chopping frequency region in the extent of 20 KHz or more than 20 KHz or so. The possible...
Efficient bulk power conversion from a 140-volt battery source to 48 volts dc can be accomplished by using ASCR's (Asymmetrical Silicon Controlled Rectifiers) in a 70-kHz series resonant circuit that operates at a repetition rate of 40 kHz. This paper describes a dc-to-dc converter that can deliver 2.5 kilowatts output power with an efficiency greater than 80 percent using a pair of S7310M's connected...
To meet the increasing demands of international telecommunications in Japan, 32-storied building (KDD Building) was constructed in Tokyo in 1974. In order to feed power to the telecommunication equipments, the constant voltage and constant frequency uninterruptible power plant of 4000 kVA which will meet the demand of power consumption required for the future increase of telecommunication equipments...
The Buck/Boost Power System is a new telephone power supply capable of providing a fully regulated output under either a.c. mains operation or battery operation. This article discusses design objectives, principles and operation, technical problems to be overcome and economic aspects of the Buck/Boost System. It also describes the first large installation based on the buck/boost system for powering...
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