• Title/Summary/Keyword: Switching Induction Noise

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-A Study on the Switching Induction Noise Characteristic of A1 wiring Duct Using Taguchi Method- (다구찌 방법을 이용한 A1 배선덕트의 스위칭 유도노이즈 특성에 관한 연구)

  • 홍석묵;박명규
    • Journal of the Korea Safety Management & Science
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    • v.5 no.2
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    • pp.199-214
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    • 2003
  • With the progress of industrial technology, industrial machinery and home appliances have multi-function and high performances by the electronic control technology. Various results are given from the measuring switching induction noise according to environmental condition and its effects cannot be predicted accurately. Therefore, the output results should be analyzed and applied to practical work. To minimize the false operation, Taguchi Method used to solve the quality problem is adopted to analyze the characteristics within the constrained measuring level.

Switching Noise and Conducted Noise of Two-Phase Space Vector SRP based Induction Motor Drives with Double Zero Vector Modes (2중 영벡터 모드를 갖는 2상 공간벡터 SRP기반 유도모터 구동시스템의 스위칭 소음과 전도 노이즈)

  • Kim, J.G.;Lim, Y.C.;Jung, Y.G.
    • Proceedings of the KIEE Conference
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    • 2004.04a
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    • pp.109-113
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    • 2004
  • In case while modulation index (M) is more than 0.7, the spectrum of motor voltage and current of a conventional two-phase SRP scheme are not reduced considerably. To solve the problems of a conventional two-phase SRP, this paper proposes a two-phase SRP(DZSRP) with double zero vector mode which zero vector is selected as V(111) in case of M $\geq$ 0.7, and zero vector is selected as V(000) if M < 0.7. For the validity of the proposed method, a 16 bit micro-controller C167 was used and the experiments were conducted with the 1.5kw induction motor under load condition. And the experimental results show that the switching noise spectrum for all the M are spread to a wide band area. Also the switching noise and conducted noise are discussed.

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Induction Motor Drives with Low Switching Acoustic Noise Based on the Two-Phase Modulated Random Lead-Lag PWM Scheme (2상 변조된 랜덤 Lead-Lag PWM기반의 저 스위칭 소음 유도모터 구동 시스템)

  • 위석오;정영국;임영철;양승학
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.2
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    • pp.151-164
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    • 2003
  • In this paper, induction motor drives with low switching acoustic noise based on the 2 phase modulated RLL(Random Lead-Lag) PWM is proposed and implemented. The proposed switching method is much bettor than 3 phase modulated RLL-PWM from the standpoint of the broadening effect of the acoustic noise spectrum. Along with the randomization of PWM Pulses, SVM(Space Vector Modulation) is executed in the TMS320C31 DSP(Digital Signal Processor). To verify the validity of the proposed RPWM(Random PWM), the experimental study was tried. The experimental results show that the performance of the proposed method and the 3 phase center-aligned SVM / conventional RLL-PWM are nearly the same from the viewpoint of the constant v/f centrel. But, in case of the proposed 2 phase modulated RLL-PWM, the spectrum characteristics of the voltage and the switching acoustic noise are shown to have better broadening effect than 3 phase modulated one.

REDUCTION OF AUDIBLE SWITCHING NOISE IN INDUCTION MOTOR DRIVES USING RANDOM POSITION PWM

  • Na, Seok-Hwan;Wi, Seok-Oh;Lim, Young-Cheol;Yang, Seung-Hak
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.316-319
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    • 1998
  • RPWM(Random Pulse Width Modulation) is a switching technique to spread the voltage and current harmonics on the wide frequency area. Using randomly changed switching frequency of the inverter, the power spectrum of the electromagnetic acoustic noise cab be spread to the wide-band area. The wide-band noise is much more comfortable and less annoying than the narrow-band one. So RPWM have been attracting an interest as an excellent method for the reduction of acoustic noise on the inverter drive system. In this paper a new RPPWM (Random Position PWM) is proposed and implemented. Each of three pulses is located randomly in each switching interval. Along with the randomization of PWM pulses, the space vector modulation is executed in the C167 microcontroller also. The experimental results show that the voltage and current harmonics were spread to wide band area and that the audible switching noise was reduced by proposed RPPWM method.

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A Switching Method of Single Phase Grid Connected Inverter for Common Mode Noise Reduction (계통연계형 단상인버터의 Common Mode Noise 저감을 위한 Switching 방법)

  • Lee, Seung-Ju;Hong, Chang-Pyo;Kim, Hag-Wone;Cho, Kwan-Yuhl
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.1
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    • pp.27-33
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    • 2016
  • A pulse-width modulation (PWM) method for common mode noise reduction in a PWM inverter connected to a single-phase grid is proposed in this study. The extensively used conventional switching method may experience common mode voltage problems, which generate current leakage and electromagnetic induction problems. In the proposed switching method, the neutral point of the output voltage is always fixed at both ends of the input voltage to reduce common mode noise. The validity of the proposed method is proven through simulation and experimental results.

Output Filler Design for Noise Reduction of Induction Motor Drive System using H-Bridge 7-Level Inverters (H-Bridge 7레벨 인버터를 이용한 유도전동기 구동시스템의 노이즈 저감을 위한 출력 필터설계)

  • Kim, Soo-Hong;Ahn, Young-Oh;Kim, Yoon-Ho;Bang, Sang-Seok;Kim, Kwang-Seob
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.3
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    • pp.36-44
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    • 2006
  • In general, the generated harmonics and noise of the PWM inverter are affected by PWM switching method, switching frequency, dv/dt and di/dt. Since multilevel inverters are often applied to the high power system, and operates with low switching frequency, theyproduce large size of harmonic contents and noise. Thus it is necessary to install output filters in the multilevel inverter. In this paper a filter design approach for the harmonic and noise reduction the three phase induction motor driving system using H-bridge 7-level inverter system is presented. The passive filter that has low cost and simple structure and can effectively reduce harmonics and noise, is designed and applied to the three phase induction motor drive having multilevel inverter system. The designed system is implemented and verified by simulation and experiments.

A Study on the Reliability and Optimal Control of Half-Bridge Inverter for Induction Beating System (유도 가열용 Half-Bridge 인버터 시스템의 신뢰성 향상 및 최적제어에 관한 연구)

  • 유상봉
    • Journal of the Korean Professional Engineers Association
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    • v.33 no.1
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    • pp.94-105
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    • 2000
  • The purpose of this paper is to obtain the improved reliability and optimal control of the half-bridge inverter for induction heating system. Parasitic inductance components within the inverter circuit for induction heating including the loss-less turn-off snubber capacitor considerably affect stable operation and noise level of the system. This paper analyzes the effect of the inductance in detail and presents a new snubber configuration suitable for the half-bridge inverter to effectively reduce it. In the half-bridge inverter for induction heating the capacity of the loss-less snubber capacitor determines the switching losses because the zero voltage turn-on switching is used. However, the increase of the capacitor is limited by the system specifications, so that it is not easy work to reduce the switching loss. To effectively overcome the limitation, this paper introduces an active auxiliary resonant circuit suitable for the half-bridge inverter circuit, which operates actively according to the variation of load condition. It is also one of the most important study issues for the half-bridge inverter driven induction heater that the development of optimal control scheme considering varied load condition should be achieved. The control strategy ensures a very stable operation of overall inverter system and zero voltage turn-on switching irrespective of sensitive load parameter variations, in particular, even under the non-magnetic materials.

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Novel Electromagnetic Induction Eddy Current DPH based Continuous Pipeline Fluid Heating using Soft Switching PWM High Frequency Inverter

  • Nam, Jing-Rak
    • Journal of information and communication convergence engineering
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    • v.6 no.3
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    • pp.305-309
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    • 2008
  • This paper presents an innovative prototype of a new conceptual electromagnetic induction eddy current based fluid heating appliance using voltage-fed quasi resonant zero voltage soft switching PWM high-frequency inverter using IGBTs, which can operate at a constant frequency variable power regulation scheme. The promising simple high efficient low noise inverter type electromagnetic induction eddy current based pipeline fluid heating appliance is proposed for saturated steam generator, superheated steam generator, hot water and hot air producer, metal catalyst heating for exhaust gas cleaning in engine. Under these technological backgrounds, a novel electromagnetic induction eddy current Dual Packs Heater(DPH) based pipeline fluid heating incorporates thin metal layer type package for continuous fluid heating appliances applying two types of voltage-fed quasi load resonant ZVS-PWM high frequency inverter. The unique features of a novel electromagnetic induction eddy current DPH based continuous pipeline fluid heating appliance is illustrated on the basis of simulation and discussed for the steady state operating characteristics and experimental results.

Study on the Parallel Resonant Inverter of an High Frequency Induction Heating System which the Frequency Tracking and the Power Regulation is possible (주파수 추종과 정전력 제어가 가능한 고주파 유도가열기의 병렬 공진형 인버터에 대한 연구)

  • 김남수;김태언;김승철;임영도
    • Proceedings of the IEEK Conference
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    • 2002.06e
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    • pp.63-66
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    • 2002
  • This paper has been studied the parallel resonant inverter which controlling the constant power and tracking the load resonant frequency with PLL is possible, in order to minimize switching losses. The current-fed full-bridge type parallel resonant inverter of an induction heating system was composed of IGBT in switching device. For regulating the output power of an induction heating system, the Fuzzy controller is used. The Fuzzy controller makes the control signal for a stable power regulating control and when reference is changed, it is superior to adaptability. It has been evaluated a stable behavior for a noise with switching and a load disturbance.

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A Real-Time RPWM Inverter for Reduction of Switching Frequency Band Noise in the Induction Motor (유도전동기의 스위칭 주파수대 소음 저감을 위한 실시간 RPWM 인버터)

  • 나석환;최창률;양승학;김광헌;임영철;박종건
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.11 no.6
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    • pp.64-73
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    • 1997
  • RPWM(Random Pulse Width Modulation) techniques have been attracting an interest as an excellent reduction method of acoustic noise on the inverter drive system. Using randomly changed switching fre-quency of the inverter, the power spectrum of the electromagnetic acoustic noise can be spread out into the wide-band area. The wide band noise is much more comfortable and less annoying than the narrow-band one. This paper describes an implementationof the triangular carrier frequency modultde RPWM inverter drive system The poweer soedtrum of the noise emittde from the induction motro was measured in the anechoic chamber. The analysis of the sources for the acoustic noise and the effects of the noise reduction are confirmed by the ceasured dpectra of the noise. Real-time RPWM along with the speed control was achieved by high speed DSP(Digital Signal Processor ) TmS320C31, By changing the center frequency and the bandwidth of the carrier, theis real-time RPWM scheme can be used as an efficient switching frequency band acoustic noise reduction method for the inverter system with variant load conditions.

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