METHOD OF STABILIZING CURRENT LEVEL IN WINDING OF TWO-WINDING STEP MOTOR OPERATING IN FULL-STEP MODE, AND DRIVER FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC H02P8/12 H02P8/22 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the electrical equipment. Method of current level stabilization in winding of double-winding SM, operating in full-step mode, at which winding power supply is carried out by means of two power half-bridges. At increase of current in lower arm of that power half-bridge, in which lower switch is closed, above specified first upper threshold value at open upper switches of both power half-bridges current level is compared in lower arm of that power half-bridge, in which lower switch is closed, with specified second upper threshold value, when exceeding of which this lower key is opened. Thereafter, current level is controlled in the lower arm of the power half-bridge where the current flows in the negative direction. And, when current level reaches a predetermined second lower threshold value, closing the lower switch of the power half-bridge, which provides current flow in the winding in the previous direction. At that, the specified second upper threshold value is selected above the specified first upper threshold value. A given second lower threshold is selected above a given first lower threshold. In order to implement method of current level stabilization in double-winding SM winding, its driver includes two adders, three program-controlled keys, a third comparator, a second, a third and a fourth reference voltage source and a NOT logic element in the current stabilization signal generation unit.

EFFECT: technical result consists in improvement of accuracy of stabilization of current level at any moment of its flow in winding of step motor (SM) in any possible case of switching of power bridges.

2 cl, 6 dwg