Adaptive sigma-delta modulator applied to control a five level multilevel inverter

• Published in: Proceedings of the Fifth IEEE International Caracas Conference on Devices, Circuits and Systems, 2004 Vol. 1; pp. 219 - 224
• Main Authors: Diaz, C.S., Escobar, F.I., Diotaiuti, G.C., Arguis, V.M.G.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Adaptive control; Applied sciences; Capacitors; Circuit properties; Delta-sigma modulation; Dielectric, amorphous and glass solid devices; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Frequency modulation; Information, signal and communications theory; Modulation, demodulation; Programmable control; Prototypes; Pulse width modulation; Pulse width modulation inverters; Resonance; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal and communications theory; Signal convertors; Switching converters; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Power converter; Modulator; Prototype; Direct current convertor; Resonant circuit; Power electronics; Output signal; Switching; Implementation; Sigma-delta modulation; Signal spectrum; Frequency spectrum; Pulse duration modulation; Capacitor; Adaptive modulation; Multilevel system
• ISBN: 9780780387775; 0780387775
• DOI: 10.1109/ICCDCS.2004.1393386

Multilevel inverters have recently acquired importance in the number of publications in scientific literature. The PWM modulation technique is the general technique to control it. But it can be complicated to implement, moreover if the reference changes. Sigma-delta modulation can be a more simple solution, but has a problem. Its output signal frequency spectrum is worse than the PWM frequency spectrum. This paper describes the development of an adaptive sigma-delta modulator that allows to control a floating capacitors five levels multilevel inverter from, at the moment, a single tone 50 Hz reference signal. The modulator sample frequency is 200 kHz and it improves greatly the frequency spectrum of a simple sigma-delta modulator. Instead the sigma-delta modulation can perfectly be used in resonant DC-link converters, in this paper the prototype developed works with hard switching.