Maximum-power motor

Claim 1

A monitoring device for maintaining a mean maximum power of an electrical installation having a plurality of loads connected to a supply network, said device comprising: power-detector means responsive to the power drawn by said loads and producing a direct-current voltage proportionally to the drawn power; a voltage-frequency converter connected to said power-detector means for transforming said direct-current voltage proportional to power into a pulse train of a frequency proportional to the detected power; summing means connected to said converter for summing pulses of said train between two cycle pulses having an interval defining the cycle time of the device; a flip-flop connected to said summing means and changing state upon said summing means accumulating a value in excess of a predetermined threshold; a shift register connected to said flip-flop and registering the switching state thereof; means for evaluating the contents of said shift register for each operating cycle; and a logic circuit connected to said evaluating means for disconnecting said loads in a succession determined by preprogrammed priorities upon an evaluation of the contents of said shift register manifesting an excess power drain during the respective operating cycle.

Claim 9

A method of maintaining a predetermined power demand for an electrical installation connected to a supply network and having a plurality of loads, said method comprising the steps of: producing a direct-current voltage representing the instantaneous power drawn by said installation from said network; converting said direct-current voltage into a pulse train having a frequency proportional to said instantaneous power; summing pulses of said train over a predetermined interval corresponding to an operating cycle; changing the state of the flip-flop in response to the level of summed pulses as read once during each operating cycle; recording the states of said flip-flop in a 64-bit shift register and stepping said shift register by one stage during each operating cycle; registering the contents of said shift register in a counter during each of said operating cycles and comparing the register count to a setpoint value; and in a predetermined sequence disconnecting said loads in accordance with preprogrammed priorities upon the count register iin said counter exceeding said setpoint value and at each such operating cycle at which said register count exceeds said setpoint value.

Claim 10

A method of maintaining a predetermined power demand for an electrical installation connected to a supply network and having a plurality of loads, said method comprising the steps of: producing a direct-current voltage representing the instantaneous power drawn by said installation from said network; converting said direct-current voltage into a pulse train having a frequency proportional to said instantaneous power; summing pulses of said train over a predetermined interval corresponding to an operating cycle; changing the state of the flip-flop in response to the level of summed pulses as read once during each operating cycle; recording the states of said flip-flop in a 64-bit shift register and stepping said shift register by one stage during each operating cycle; registering the contents of said shift register in a counter during each of said operating cycles and comparing the register count to a setpoint value; and in a predetermined sequence disconnecting said loads in accordance with preprogrammed priorities upon the count register iin said counter exceeding said setpoint value and at each such operating cycle at which said register count exceeds said setpoint value.