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A family of zero voltage transition (ZVT) DC-DC PWM converters which uses a series resonant L-C network connected in series with the auxiliary switch, called a self-commutated auxiliary network, is presented. Thus, a simple and reliable means of achieving ZCS conditions to auxiliary switch commutations for wide line and load ranges is provided. Furthermore, this auxiliary network is placed in parallel with the main power converter maintaining the ZVT characteristics, so that neither voltage nor current place additional stresses on main devices. The improved ZVT PWM boost converter is analysed and its feasibility and reliability is confirmed by experimental results obtained from a 1 kW, 100 kHz laboratory prototype.
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Martins et al. (2003) studied this question.
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