MAGNETISING CURRENT LIMITER FOR TRANSFORMER OF PUSH-PULL VOLTAGE CONVERTER Russian patent published in 2014 - IPC H02M1/40 

FIELD: electricity.

SUBSTANCE: invention is related to devices converting direct current to direct current, and namely to control systems of such devices and it may be used in push-pull voltage converters in order to limit magnetising current of the transformer. The substance of the invention consists in the following. Current sensors generate signals proportional to currents passing through the primary and secondary windings. A magnetising current valuator generates a signal proportional to magnetising current equal to the difference in current of the primary winding and adjusted current of the secondary winding. The input voltage sensor generates a signal proportional to supply voltage of the converter. The received signal is used as the reference for determination of a limitation level for magnetising current. The comparator generates a logical "1" when magnetising current is more than the reference signal and a logical "0" when magnetising current is less than the reference signal. A comparator, a pulse-width modulator and logic gates AND generate control signals for the push-pull voltage converter.

EFFECT: limitation of magnetising current at the minimum permitted level within the whole range of supply voltage.

1 dwg