Conference Paper

Analysis and suppression of conducted EMI emission in PWM inverter

Dept. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
DOI: 10.1109/IEMDC.2003.1210695 Conference: Electric Machines and Drives Conference, 2003. IEMDC'03. IEEE International, Volume: 3
Source: IEEE Xplore


This paper presents a study of conducted EMI emission in PWM inverter complying with the EMC standard in 15 kHz to 50 MHz range. All major circuit components including switching IGBT, passive components and interconnects are modeled in high frequency domain. Common mode and differential mode switching noise together with EMI's filter design and topology are the key aspects that have been considered. In addition, the paper reports the conducted EMI measurements results for PWM inverter that have turned to be decisive in the reduction of the conducted EMI.

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    • "It is well known that conducted EMI can be separated into common-mode EMI (CM-EMI) and differential-mode EMI (DM-EMI) according to EMI paths. Since in many applications CM-EMI is the major component of the conducted EMI, such as PV inverter systems [1], this paper will focus on the CM-EMI of power converters and puts forward a spectrum calculation method for the CM-EMI analysis of power converters under CSPWM. The proposed spectrum calculation method uses an analytical solution to identify the harmonic components of CM-EMI spectrum based on the established CM-EMI paths and double Fourier series, which can be employed to predict the CM-EMI accurately. "
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    ABSTRACT: With the emergence of renewable energy power generation, varied kinds of DC-AC inverters based on SPWM control including photovoltaic (PV) inverters have been widely applied in practice. However, high-frequency operations of switches under traditional SPWM (TSPWM) will lead to obvious EMI peaks on switching frequency and its multiples, which may cause serious electromagnetic interference (EMI) problem. As a new kind of spread spectrum technology, Chaotic SPWM (CSPWM) is proposed in recent years and got widely researched in the worldwide. CSPWM has strong effectiveness on EMI suppressing and only need simple realization means. At present stage, there are some researches analyzed the EMI of PV inverters under CSPWM by spectrum calculation approach, however, these researches only focus on output voltage and output current of the PV inverters, which lack of the EMI analysis method based on the EMI conducted paths. This paper put forward a spectrum calculation method for the common mode EMI (CM-EMI) current under C SPWM. This method is designed based on CM-EMI paths and double Fourier series. In addition, simulation and experiment tests are given on a single phase PV inverter. Comparisons between the calculation results and the test results would be done to verify the correctness of the CM-EMI spectrum calculation method for CSPWM.
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    ABSTRACT: In PWM converter, the serious electromagnetic interference (EMI) is occurred due to high speed operation of switch devices. In this paper, production mechanism of common mode (CM) current in single phase full-bridge converter is analyzed, and severe affection to CM current owing to different transmission delays of two drive pulses is illustrated. It is proposed a digital CM current suppression method based on optimal drive pulses. A novel evaluation measure for CM noise level based on the energy of CM noise current is proposed. The relationship between CM noise level and the delay time of drive signals is studied. Simulated annealing searching algorithm is used to search for the global optimum of CM current energy. Simulated results show that CM current suppression based on simulated annealing algorithm (SAA) can regulate the delay time of drive signals without getting trapped at local minimums. It suppresses CM current level effectively and improves the EMC performance of PWM converter
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    ABSTRACT: Analysis of the internal electromagnetic compatibility of digitally controlled power converters is discussed. In particular, the optimum layout of the circuit configuration is designed on the basis of the actual electromagnetic interference between the power and the control section of a power converter. Besides, further improvements can be achieved by means of an auto- tuning additional board, which scans all the possible converter switching frequencies and analyses the distortion on the control signals corresponding to each frequency. Its main task is to select only the ones which produce low disturbances on the control signals as operating frequencies for the converter.
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