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An input-series flyback auxiliary power supply scheme is proposed and investigated, which is suitable for the high-input-voltage multiple-output low-power applications. In this power supply, a common integrated-transformer is adopted, all of the series-modules are operating synchronously, and the active input voltage sharing (IVS) can be achieved efficiently without any special controller. The active...
Increased usage of renewable energy sources has boosted the demand for power electronics converters. Indeed, the DC/DC flyback converter is nowadays frequently used in applications where isolation is required, due to its low component count, simple structure and high energy efficiency. One of the major challenges faced in a flyback converter is the excess voltage stress sensed by its semiconductor...
An impulsed-power supply used to eliminate arcing phenomenon and to maintain lamp luminance for field emission lamp is presented in this paper. To compact the system configuration and to reduce the system cost, the flyback topology is employed as the main circuit. Next, the phase-locked loop technique is embedded as a feedback mechanism in this study. With the proposed control mechanism, the peak...
This paper presents a novel constant current LED controller with primary-side feedback control method for flyback topology. The method is proposed based on sampling input peak current and secondary-side electric information detected by an extra auxiliary winding. Eliminating opto-isolator, the controller can still regulated the output current precisely by designing special sample circuit and compensating...
Flyback converters are widely used in consumer electronic products and other applications that require low cost isolated power supply with less than or around 200W output power. Transition Mode is one method to control the Flyback converters. This control method has the advantage of soft-switching turn-on, which greatly reduces the turn-on loss. This paper discusses the design of a CMOS Transition...
Primary-side sensing (PSS) technique can be used for the output voltage or current regulation by employing an auxiliary winding. However, the sensed voltage may be corrupted by switching noise due to leakage inductance, winding resistance, and nonlinearity of the magnetic core, therefore the sensed voltage can only achieve limited accuracy. With the advance of power control IC realization technology,...
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