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

FIELD: electrical engineering.

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

EFFECT: formation of a constant output voltage from a constant input voltage with a reduction in dynamic losses, providing the ability to turn on the power switch to a zero current value and, as a consequence, reduce dynamic losses in the power switch when it is turned on and due to the squareness of the current in the conducting state when turned off.

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