CONTROLLED STEP-DOWN DC VOLTAGE CONVERTER Russian patent published in 2011 - IPC H02M3/18 

FIELD: electricity.

SUBSTANCE: controlled step-down DC voltage converter, comprising inlet, outlet and common outputs for connection of accordingly DC voltage source and load, n chains, which are parallel connected to outlet leads, and each chain comprises serially joined discharge diode, capacitor and controlled discharge switch, (n-1) charge diodes, every of which by anode is connected to negative lead of capacitor of previous chain, n controlled charge switches connected between inlet lead and according charging bus, and also controlled adjustment elements, every of which is connected parallel to discharge diode of according chain, and two groups of switching elements, besides, each switching element of the first group is connected parallel to controlled discharge switch of according chain, and each switching element of the second group is connected by the first lead to according charge bus, and by the second lead - to the second one, and subsequent switching elements of the second group are connected to cathodes of according charging diodes. Converter includes n reactors, every of which is connected between the second lead of switching element of the second group and positive lead of capacitor of according chain.

EFFECT: improved efficiency factor and reduced level of pulse noise due to provision of soft switching mode of charge keys and smoothening of charge current pulses shape.

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