FIELD: electrical engineering.
SUBSTANCE: invention relates to intrinsically safe devices, and more particularly to an intrinsically safe voltage limiting device with temperature and/or power limitation. Intrinsically safe voltage limiting device includes a regulator bus, a ground bus, and a shunt regulator assembly. Shunt regulator assembly is connected to controller bus and grounding bus and comprises one or more control units. Shunt regulator assembly is configured to limit the voltage applied to the regulator bus and the ground bus to limit the voltage to a safe value. Intrinsically safe voltage limiting device also includes a unit which is sensitive to change of power, configured to activate one or more limiting units for reduction of power dissipated on corresponding control units without increasing voltage limitation.
EFFECT: higher reliability.
21 cl, 6 dwg
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