Abstract
Forward Flyback converter, having few component count, soft switching feature and high conversion efficiency, caught the eyes from both academia and industries. Several control strategies, such as critical conduction mode, fixed off-time control and so on, have been proposed to realize either soft switching or high conversion efficiency. However, when the converter operates at full load range, not a single control strategy can both achieve high efficiency and limit switching frequency range. The paper proposed a hybrid control strategy to take full advantages of different control methods in order to realize high overall efficiency while maintaining a reasonable switching frequency range. A 300W prototype was built to verify the proposed hybrid control strategy and the proposed method can achieve 1.5% efficiency higher than the traditional control strategy at light load or extremely light load. The CEC efficiency reached up to 97.79%, which is 0.4% higher than the CRM operation mode. The experimental results validated the feasibility of the proposed hybrid control method.
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