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A new control strategy of active clamped flyback inverter for a photovoltaic AC module system

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5 Author(s)
Young-Ho Kim ; Sungkyunkwan Univ., Suwon, South Korea ; Jun-Gu Kim ; Young-Hyok Ji ; Chung-Yuen Won
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In this paper, a new control strategy of an active clamped flyback inverter for a photovoltaic AC module system is proposed. In the flyback inverter, a voltage spike across a main switch is generated from a resonance between a leakage inductance and an output capacitance across the main switch. For reducing the voltage spike of the main switch, a snubber circuit is used. In case of the active clamp technique, the circuit has a conduction loss, switching loss and gate drive loss because the switch is turned on and off with a hard switching. Therefore, a consideration reducing the losses of the active clamp circuit is required. If the new control strategy is used, the active clamp switch is not operated during a low voltage in an utility line period. Therefore, the losses of the active clamp circuit can be reduced. In order to verify these, theoretical analysis and simulations are performed.

Published in:

Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on

Date of Conference:

May 30 2011-June 3 2011