Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2002.04a
- /
- Pages.106-111
- /
- 2002
A New Three Phase Random PWM Scheme with Fixed Switching Frequency
고정 스위칭 주파수를 갖는 새로운 3상 Random PWM 기법
- Kim, Hoe-Geun (Dept. of Electrical Eng. Chonnam National University) ;
- Wi, Seog-Oh (Dept. of Electrical Eng. Chonnam National University) ;
-
Lim, Young-Cheol
(Dept. of Electrical Eng. Chonnam National University)
;
- Na, Seok-Hwan (How) ;
- Jung, Young-Gook (Dept. of Electrical Eng. Daebul University)
- 김회근 (전남대학교 전기공학과) ;
- 위석오 (전남대학교 전기공학과) ;
-
임영철
(전남대학교 전기공학과)
;
- 나석환 ((주)하우 무선데이터 통신연구소) ;
- 정영국 (대불대학교 전기공학)
- Published : 2002.04.25
Abstract
In this paper, a new three phase RPWM(Random PWM)with fixed switching frequency is proposed. In the proposed RPWM, each of three phase pulses is located randomly in each switching interval. Based on the space vector modulation technique, the duty ratio of the pulses is calculated. Along with the the randomization of the PWM pulses, we can obtain the effects of spread spectra of voltage, current as in the case of randomly changed switching frequency. To verify the validity of the proposed RPWM, the experimental study was tried. Along with the randomization of PWM pulses, the space vector modulation is also executed in the C167 micro-controller. The experimental results show that the voltage and current harmonics are spread to a wide band area and that the audible acoustic noise is reduced by the proposed RPWM method.
Keywords