FIELD: electrical engineering.
SUBSTANCE: in emergency mode additional part AB is used and all elements of this part are connected automatically to load thus providing uniform discharge of all AB elements; it leads to extension of service life and provision of voltage level at load required for normal functioning of electrical users.
EFFECT: extension of service life for accumulator batteries, improvement of reliability, simplification of structure, reduction of manufacturing costs for arrangement of DC power supply which results in increase of efficiency factor.
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