Title :
Power distribution in pulse-density modulated waveforms
Author :
Calleja, Hugo ; Pacheco, Joel
Author_Institution :
Cenidet-Electron, Cuernavaca, Mexico
Abstract :
The pulse-density modulation technique (PDM) has been used in resonant inverters because it maintains soft-switching for any output power level. Its major drawback is that subharmonics of the resonant frequency are generated. In this paper, the frequency spectra of PDM waveforms, as a function of the duty cycle and the load time constant, are investigated. The current is analyzed as an amplitude modulated waveform, and results for regular and nonregular PDM are obtained. It is shown that the nonregular PDM, with the highest number of partial sequences and the best symmetry, produces the lowest subharmonics
Keywords :
DC-AC power convertors; PWM invertors; harmonic analysis; harmonic distortion; power conversion harmonics; resonant power convertors; PDM waveforms; amplitude modulated waveform; duty cycle; frequency spectra; load time constant; power distribution; pulse-density modulated waveforms; resonant frequency subharmonics; resonant inverters; soft-switching; Capacitors; Permeability; Power distribution; Power generation; Pulse inverters; Pulse modulation; Resonance; Resonant frequency; Resonant inverters; Skin;
Conference_Titel :
Power Electronics Specialists Conference, 2000. PESC 00. 2000 IEEE 31st Annual
Conference_Location :
Galway
Print_ISBN :
0-7803-5692-6
DOI :
10.1109/PESC.2000.880522
