LOGIC INPUT CIRCUIT WITH ENERGY TRANSFER AND ADAPTABLE IN INPUT VOLTAGE

摘要

The invention concerns a logic input circuit for an industrial equipment automatic system powered by a direct current voltage source, in particular a battery (16), comprising a voltage amplifying energy converter (12) consisting of an inductance coil L and a switching transistor TR, connected to the input E1 of the circuit (10); a logic level sensor DL with optocoupler (20), and a clock circuit H controlling the transistor switching TR by adjusting the frequency or the cyclic ratio to be adapted in voltage to the signals applied at the input E1, and the overvoltage value generated in logic high (1) by the inductance coil L when the transistor TR is switched off-state.