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Novel static inverters with high frequency pulse DC link

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2 Author(s)
Daolian Chen ; Dept. of Electr. Eng., Nanjing Univ. of Aeronaut. & Astronaut., Jiangsu, China ; Lei Li

A novel combined soft switching technique and a novel topological family of the static inverter with high frequency pulse dc link are proposed in this paper. The topological structure is constituted of isolated high frequency pulse dc link circuit and inverter. In order to overcome the duty cycle D of the one transistor forward mode Static Inverter less than 0.5 and the topology of the interleaved forward mode Static Inverter more complicated, the duty cycle extension of high frequency pulse dc voltage is proposed in this paper. The steady operation principle of the active clamp forward mode high frequency pulse dc link static inverter with duty cycle extension and the control strategy of three-state discrete pulse modulation hysteresis current are deeply investigated. The design criteria for the key circuit parameters are gained. By using combined soft switching technique and the duty cycle extension of high frequency pulse dc voltage, a designed and developed 750 VA 27 V dc/115 V 400 Hz ac prototype has the advantages such as high efficiency, high power density, high reliability, high steady precision, fast dynamical response, low THD of output voltage, strong ability of over-load and short-circuit.

Published in:

Power Electronics, IEEE Transactions on  (Volume:19 ,  Issue: 4 )