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A power supply arrangement which is intended, in particular, for intrinsically safe electro-hydraulic control systems for mining and comparable applications, in which several control units and loads controlled thereby are supplied as a group from a common constant voltage source. The voltage source

A power supply arrangement which is intended, in particular, for intrinsically safe electro-hydraulic control systems for mining and comparable applications, in which several control units and loads controlled thereby are supplied as a group from a common constant voltage source. The voltage source has a current capacity which is smaller than the total current requirement of all the units and loads supplied by it. Each control unit has actual value current measuring device and two controllable current sources which are connected to a common potential line which can simultanously act as a data bus. The arrangement enables the respective effective dynamic current consumption and demands of the control units and loads to be ascertained to enable the available power of the constant voltage source to be determined at any time at the individual control units. The available power of the source can be utilised for an optionally time-staggered ordered control process according to predetermined priorities without overloading the voltage source.

대표청구항 ▼

A power supply arrangement for use in an electro-hydraulic support control system for mining and civil engineering, in which a group of control units utilize control means in the form of microprocessors, microcomputers or electronic evaluators to control temporary power supply of electrical loads fr

A power supply arrangement for use in an electro-hydraulic support control system for mining and civil engineering, in which a group of control units utilize control means in the form of microprocessors, microcomputers or electronic evaluators to control temporary power supply of electrical loads from a constant voltage source common to the group, the voltage source being designed for a maximum current requirement of all electrical loads supplied by it; said arrangement comprising a current measuring device for each control unit for determining the effective dynamic current consumption of the unit and the loads controlled thereby, an adjustable current source for each control unit which is adjusted by the respective device to a current value dependent on the effective current consumption and a common potential line connected to all the adjustable current sources which carries a control voltage which varies according to a total of the current consumptions, of all the units, the control voltage being usable by the control means in the control units to determine the available current which the voltage source can deliver without overloading.