SUMMARYThis paper presents a high-performance LED lamp driver with an improved single-stage Flyback configuration. A constant current control method is used to regulate the lamp current and brightness. A laboratory prototype has been built and tested. With the prototype, high efficiency, high power factor, and constant lamp current can be achieved under different pieces of LED series connection.
SUMMARYThis paper presents a DC/DC converter topology for renewable energy systems. The proposed DC/DC converter can be used to obtain a well-regulated output voltage from low-voltage power source, such as wind turbine, photovoltaic array, fuel cell, etc. It has the merits of high efficiency, low device stresses, and low current ripple. The operating principle, theoretical analysis, and design criteria are provided in this paper. A laboratory prototype was successfully implemented. The simulation and experimental results are given to verify the feasibility of the proposed scheme.
SUMMARYThis paper presents a single-ended primary inductance power-factor-correction converter (SEPIC PFC) for driving multiple lighting LED lamps. With the aid of this converter, high power factor and high efficiency can be achieved by a simple single-stage circuit with low device stress features. A burst-mode dimming method is used to regulate the current and brightness of multiple LED lamps. A laboratory prototype is also built and tested. With the prototype, high power factor can remain under universal input voltage operation and individual lamp brightness control.
SUMMARYThis letter presents a single-stage soft-switched full-bridge AC/DC converter for low-voltage/high-current output applications. A phase-shifted method with a variable frequency control is used to regulate the DC bus voltage and the output voltage of the single-stage AC/DC converter. The proposed circuit topology and control scheme exhibit superior performances (i.e. high power factor, high-efficiency, and ring-free features). Correspondingly, a laboratory prototype, 500 W 5V/100A AC/DC converter, is implemented to verify the feasibility of the proposed design.
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