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For PWM DC-DC converters, keeping the output voltage steady is very important. When the input voltage has a step change, up impulse or down impulse voltage will occur in the output. Both the magnitude and the duration time of the over voltage are severely influencing to the whole system, which will destroy or disorder the circuit. Step-down converter is used as an example to investigate the input...
A novel PWM technique in active power factor correction converter for power supplies with a 1-phase front end diode rectifier is proposed and analyzed. Regarding PFC converters as highly non-linear plants with inherence parameter uncertainties, the deleterious effects due to large disturbances in line voltage and load resistance are tackled by two sided latched PWM technique with sophisticated feedback...
Power converters for renewable energy systems are expected to have a high lifetime, low costs and a very high efficiency over a wide input power and voltage range (e.g. for photovoltaic and fuel cells). Although very high efficiencies can be achieved with hard-switched power converters operating with state of the art semiconductors, hard-switching results in several disadvantages such as conducted...
This document describes a new approach to generate binary signals with varying pulse-lengths for the use in power electronics. The novel modulation scheme SB-ZePoC (Zero Position Coding with Separated Baseband) was primarily developed for Class-D audio amplifiers. This modulation scheme has the extraordinary advantage that the signal band is free of harmonic distortion and carrier intermodulation...
This paper reports on a novel modulation strategy for generation of band limited signals with binary switches, which was originally developed for audio power amplifiers, and on applying it to energy conversion. This modulation strategy has the extraordinary advantage that the signal band is free of harmonics or carrier intermodulation products. This so called ldquoZero-Position-Coding with Separated...
This paper presents a new digital self-oscillating modulator (DiSOM) that allows the duty cycle to be changed instantly. The DiSOM modulator is shown to have variable switching that is a function of the duty cycle. Compared to a more traditional digital PWM modulator based on a counter and comparator the DiSOM modulator allows the sampling frequency of the output voltage control loop to be higher...
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