Automatic cut-out device
AssigneeSocieta Italiana Vetro S/V S.p.A.
InventorsGiorgio Ciarniello, Oscar De Lena
Life of this patent
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Abstract
A device for cutting out non-essential loads in a generator and battery-fed electric plant includes a voltage detecting unit connected across the terminals of the battery. The detecting unit may be a relay. Whenever the voltage at the terminals falls below a predetermined level, the detecting unit effects the disconnection of the non-essential load or loads from the terminals of the battery and generator, while allowing the essential load or loads. The detecting unit preferably includes a differential amplifier having one of its inputs connected to a voltage divider connected in parallel with the battery and its second input coupled to a source of reference potential.
Claims7
A device to cut out non-essential loads in a generator and battery fed electric plant including, in addition to a circuit of essential loads, also a circuit of at least one non-essential load, said device comprising a voltage responsive means connected across terminals of said battery for opening said circuit of at least one non-essential load whenever voltage at said terminals falls below a pre-set level, said voltage responsive means including an integrated unit having means for developing a constant reference voltage and a differential amplifier;
- a power transistor, said differential amplifier having its output controllably connected to said power transistor;
- and a normally closed contact relay coupled to said power transistor to be activated thereby whenever the output of said differential amplifier exceeds a pre-adjustable critical level, said output being proportional to the difference between the battery voltage and said constant reference voltage.
Dependencies are inferred from the claim text.