Multistage High Power Factor Rectifier with passive lossless current sharing
نویسندگان
چکیده
-Passive current sharing in multiphase converters, where resistive losses are not dominant, is a quite complex goal. In this work, input impedance of active clamp boost converters is used like a lossless passive equalization in multistage high power factor rectifier. This technique allows the design of high power converters by and easy parallel association of power stages. Experimental results are presented, taken form a tree stages laboratory prototype rated at 0.35x3 kW, input ac voltage of 230Vrms, output voltage of 400V, and 100 kHz switching operation. Due to the simplicity of the current share technique, the control can be done using analog control based on the Unitrode’s UC3854 strategy. Key-Words: -Boost converter, power factor correction, current sharing, paralleled converters, zero-voltage switching.
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