ADJUSTABLE DC VOLTAGE STEP-DOWN CONVERTER Russian patent published in 2008 - IPC H02M3/18 

FIELD: converter engineering; power supplies.

SUBSTANCE: proposed DC voltage step-down converter has input, output, and common leads for connecting DC power supply and load, respectively, as well as n circuits parallel-connected to output leads. Each circuit is set up of series-interconnected discharge diode, capacitor, and controlled discharge switch. Converter also has (n - 1) charge diodes, each inserted between unlike-polarity capacitor leads of respective adjacent circuits, controlled charge switch inserted between input lead and charge bus, controlled adjusting components, each connected in parallel with discharge diode of respective circuit, and two groups of switching components; each component of first group is parallel-connected to discharge switch of respective circuit and each switching component of second group is connected through one of its leads to common point of connection of capacitor and discharge switch of respective circuit; other lead of second-group switching component in first circuit is connected to charge bus. Newly introduced in proposed converter are (n - 1) additional controlled charge switches 6 through 10 and buses 12 through 17; each additional charge switch is connected between input lead 11 and respective additional charge bus; other lead of each next second-group switching component is connected to its respective additional charge bus.

EFFECT: reduced impulsive noise level due to uniform distribution of charge current pulses throughout their repetition period.

1 cl, 1 dwg