CONSTANT VOLTAGE CONVERTER WITH ACTIVE CLAMPING Russian patent published in 2025 - IPC H02M3/335 

FIELD: electrical engineering.

SUBSTANCE: constant voltage converter with active clamping relates to electrical engineering and can be used in secondary power supply systems for conversion, regulation and stabilization of constant output voltage, which is galvanically separated from constant input voltage. Device comprises 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 through power control switch 3, which is implemented in the form of a field-effect transistor MOSFET, is connected to the negative pole of the input source of constant voltage. In parallel to primary winding 1 of transformer 2 there is a clamping element composed of series-connected capacitor 4 and additional switch 5, implemented in the form of field-effect transistor MOSFET. Beginning of secondary winding 6 of transformer 2 is connected to the anode of rectifying diode 7, the cathode of which is connected to one of the outputs of capacitor 8, the second output of which is connected to the end of winding 6. End of winding 6 is connected to one of the leads of capacitor 9, the second lead of which is connected through inductance coil 10 and rectifying diode 11 to the beginning of secondary winding 6 so that rectifier diode 11 anode is connected to inductance 10, and cathode – to the beginning of secondary winding 6. Capacitor 12 is connected to common point of connection of inductor 10 and rectifier diode 11, the second output of which is connected to common point of connection of cathode of rectifier diode 7 and capacitor 8. Filter capacitors 8, 9 are connected in series. Load 13 is connected in parallel to filter capacitors 8, 9. Control electrodes of switches 3, 5 are connected to pulse-width controller 14.

EFFECT: formation of constant output voltage from constant input voltage, providing possibility of switching on power switch to zero current value, formation of a rectangular shape of current through a power control switch, reduction of dynamic and static losses, reduction of inductance of the LC-filter, elimination of a shunting diode.

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