Abstract
The proposed system can overcome the disadvantage of a high peak current in quasi-resonant fly-back (QRF) converters when operated under heavy load conditions. The operating mode and control scheme of a QRF converter with dual-mode control were established and analyzed. The dual-mode control scheme not only enabled a valley-switching detection technique that satisfied the zero-voltage switching condition but also provided a constant frequency mechanism to reduce the conduction loss in QRF converters when operated in a continuous conduction mode and under heavy load conditions. The small-signal equivalent circuit model of QRF converter circuits was constructed using an average approximation method. The technological advancement of a QRF converter with a dual-mode controller was presented in this study. The circuit simulation result of the proposed QRF converter with a mix control scheme proved that the derived circuit component parameters meet the requirements of the converter.
Highlights
To improve the efficiency of an adapter operated under light load conditions, the adapter should be operated under discontinuous conduction mode (DCM), primarily due to the low current, zero-voltage-switching characteristic of the main power switch, and the zero-current switching characteristic of the output diode [1,2,3,4,5]
A quasi-resonant fly-back (QRF) converter with a discontinuous conduction switching action should be operated in continuous conduction mode (CCM)
A QRF converter has a high peak current and high switching loss, which reduces the efficiency of the converter when the main switch is turned off under a heavy load condition [11,12,13,14,15]
Summary
To improve the efficiency of an adapter operated under light load conditions, the adapter should be operated under discontinuous conduction mode (DCM), primarily due to the low current, zero-voltage-switching characteristic of the main power switch, and the zero-current switching characteristic of the output diode [1,2,3,4,5]. The supplemental strategy of Set point automatic adjustment with correction enabled (SPAACE) has performance and extend its application to more generic electrical systems. This converter has the advantages of highIn efficiency when a light load is applied, and low current stress to the has power whenofa this paper, a dual-mode fly-back converter is proposed This due converter the switch advantages heavy load iswhen applied forload low-power applications. In continuous discontinuous conduction high efficiency a light is applied, and low current stress due toand the power switch when a heavy modes, both fixed-off time control and valley-switching control applied toconduction the converter [23]. Of a dual-mode control QRF converter and analyzes its stability under dual-mode control
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