DC-DC CONVERTER WITH ACTIVE CLAMPING Russian patent published in 2023 - IPC H02M3/335 

FIELD: electrical engineering.

SUBSTANCE: DC-DC voltage converters with active clamping. The device contains transformer (2), the beginning of primary winding (1) of which is connected to the positive pole of the input constant voltage source, and the end of primary winding (1) is connected to the negative pole of the input constant voltage source through power regulating switch 3, implemented in the form of a MOSFET field-effect transistor. A clamping element consisting of series-connected capacitor (4) and additional switch (5), implemented in the form of a MOSFET field-effect transistor, is connected in parallel with primary winding (1) of transformer (2). The anode of rectifying diode (7) is connected to the beginning of secondary winding (6) of transformer (2), the cathode of which is connected to one of the terminals of capacitor (8), the second terminal of which is connected to the end of winding (6). The end of winding (6) is connected to one of the terminals of capacitor (9), which is the output capacitor of the L-shaped LC filter, the second terminal of which is through inductance (10) of the L-shaped LC filter and rectifying diode (11), the anode of which is connected to inductance (10), and the cathode to beginning of secondary winding (12), the end of which is connected to end of secondary winding 6. The anode of shunt diode (13) is connected to the common connection point of inductance 10 and rectifier diode 11, the cathode of which is connected to the common connection point of secondary windings (6, 12) and capacitors (8, 9), in parallel with which load (14) is connected. The control electrodes of keys (3, 5) are connected to pulse-width controller (15).

EFFECT: formation of a constant output voltage from a constant input voltage, providing the ability to turn on the power switch to a zero current value, forming a rectangular current shape through the power regulating switch, and reducing dynamic losses.

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