Sine Wave PWM Inverter using Zero Current Switching at Turn-On.

Nagao, Michihiko; Egami, Masaru; Harada, K.

doi:10.1541/ieejias.114.129

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…Recently the switching frequency of power converters tends to become higher to reduce the volume of passive equipment and to improve the controllability. As the switching frequency increases, the voltage error of the dead time has become remarkable because the rate of the dead time to the switching cycle relatively increased [1].…”

Section: Introductionmentioning

confidence: 99%

Dead time compensation method based on current ripple estimation

Mannen

Fujita

2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper discusses the voltage error caused by the dead time in voltage-source PWM converters. The theoretical analysis in this paper derives the nonlinear voltage error paying attention to the parasitic output capacitance in each switching device. The analytical result reveals that the turn-off current or the switching current ripple strongly affects the voltage error. In addition, it is clarified that the conventional compensation methods based on linear and three-level approximation are suitable under small and large current ripple conditions, respectively. A simple calculation method of current ripples in three-phase PWM converters are also developed to estimate the turn-off currents. A new compensation method based on the analysis is developed and compared with three different conventional methods in experiments using a 200-V, 5-kW three-phase gridconnection converter. The analysis-based method exhibits a good compensation performance having a lower current THD than the conventional methods in allover the operating range.

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Section: Introductionmentioning

confidence: 99%

Dead time compensation method based on current ripple estimation

Mannen

Fujita

2013

2013 IEEE Energy Conversion Congress and Exposition

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“…This dead time causes errors in output voltage, which may result in problems such as voltage waveform distortion and increase in motor's torque ripple. Particularly, in high-frequency switching, proportion of dead time in switching cycle grows, which requires to be compensated [2].…”

Section: Introductionmentioning

confidence: 99%

Performance of Dead‐Time Compensation Methods in Three‐Phase Grid‐Connection Converters

Mannen

Fujita

2016

Electrical Engineering Japan

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SUMMARY This paper discusses the performance of compensation methods for dead‐time voltage error in voltage‐source grid‐connection pulse‐width modulation converters. The theoretical analysis in this paper reveals the relationship between the voltage error and the current ripples through the converter. The analytical results imply that the voltage error is strongly affected by the amplitude of the current ripples as well as the source power factor. This paper proposes a new compensation method which makes it possible to use two lookup tables to reduce the calculation time in the controller. The compensation characteristics are compared by using a 200‐V 5‐kW three‐phase grid‐connection converter. As a result, conventional approximation‐based compensation methods exhibit an acceptable performance in a restricted power‐factor operation range. In contrast, the turn‐off transition‐based compensation method and the proposed method have a good compensation performance all over the power factor.

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Efficiency improvement by frequency modulation of carrier signal for an inductor commutation soft‐switched PWM inverter

Nagao

Watanabe

Harada

1996

Electron Comm Jpn Pt II

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The inductor communication soft switched PWM inverter (ICSI) gives good output waveforms and allows high carrier frequencies. However, to realize soft switching, a circulating current must always flow, so that the efficiency is not as good as in the conventional hard-switched PWM inverter (CHSI).In this paper, to alleviate the efficiency deterioration due to the circulating current, we propose a technique which uses frequency modulation (FM) of the camer signal. The frequency is designed to be higher at zero of the input signal and lower at its peak. By this technique, the circulating current is suppressed efficiently without sensing of the voltage and current of the main circuit, and efficiency is greatly improved. We quantitatively investigate this FM method and analyze the loss and efficiency of ICSI based on the FM method (FM-ICSI). We also compare it with ICSI without the FM method and discuss the effectiveness of the FM method.

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Sine Wave PWM Inverter using Zero Current Switching at Turn-On.

Cited by 7 publications

References 2 publications

Dead time compensation method based on current ripple estimation

Dead time compensation method based on current ripple estimation

Performance of Dead‐Time Compensation Methods in Three‐Phase Grid‐Connection Converters

Efficiency improvement by frequency modulation of carrier signal for an inductor commutation soft‐switched PWM inverter

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