Utility-Interfaced High-Frequency Flyback Transformer Linked Sinewave Pulse Modulated Inverter for a Small Scale NE Power Conditioner

Srawouth Chandhaket; Yoshihiro Konishi; Mutsuo Nakaoka

Utility-Interfaced High-Frequency Flyback Transformer Linked Sinewave Pulse Modulated Inverter for a Small Scale NE Power Conditioner

Srawouth Chandhaket

Yoshihiro Konishi

Mutsuo Nakaoka

Vol. 2, No. 2, pp. 112-123, Apr. 2002

10.6113/JPE.2001.02.2.112

Flyback transformer

High-frequency isolation link

Discontinuous conduction mode

Power regenerating snubber circuit

Utility-interfaced sinewave PWM inverter

NE power conditioner

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Abstract

This paper presents a novel prototype of the utility AC power interfaced soft-switching sinewave pulse modulated inverter using the high-frequency flyback transformer for the small scale distributed NE power conditioner. The proposed sinewave power conditioner circuit with a high-frequency isolation link has a function of electrical isolation, which is more cost-effective and reliable for the small-scale distributed renewal energy utilization system from a safety point of view. The discontinuous conduction mode (DCM) operation of the high-frequency flyback transformer is adopted to establish a simple and low-cost circuit configuration and control scheme. For the simplicity, the circuit operating principle is described on the basis of the modified conventional full bridge inverter, which is the typical conventional high-frequency full-bridge inverter employing the high frequency flyback transformer to enable the effective function of the electrical isolation. Then, the new circuit topology of the utility-interfaced soft-switching sinewave pulse modulated inverter using IGBTs is proposed. The proposed circuit topology is additionally composed of the auxiliary power regenerating snubber circuits, which are also mathematically analyzed for the purpose of the parameter design settings. Finally, the performance of the proposed inverter is evaluated on the basis of computer-aid simulation. It is noted that the sinewave pulse modulated output current of the inverter is synchronous to the AC main voltage.

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Cite this article

[IEEE Style]

S. Chandhaket, Y. Konishi, M. Nakaoka, "Utility-Interfaced High-Frequency Flyback Transformer Linked Sinewave Pulse Modulated Inverter for a Small Scale NE Power Conditioner," Journal of Power Electronics, vol. 2, no. 2, pp. 112-123, 2002. DOI: 10.6113/JPE.2001.02.2.112.

[ACM Style]

Srawouth Chandhaket, Yoshihiro Konishi, and Mutsuo Nakaoka. 2002. Utility-Interfaced High-Frequency Flyback Transformer Linked Sinewave Pulse Modulated Inverter for a Small Scale NE Power Conditioner. Journal of Power Electronics, 2, 2, (2002), 112-123. DOI: 10.6113/JPE.2001.02.2.112.