Patent ID: 7289878

Claim:
A liquid dispensing system operable by a user for dispensing a liquid onto a substrate, comprising: at least one solenoid actuated, non-pneumatic, liquid dispensing gun having an electromagnetic coil, a dispensing orifice and a dispensing valve stem movable relative to said dispensing orifice, said coil being operable by a current waveform comprising a higher magnitude initial peak current followed by a lower magnitude hold current; an input device operable by a user to enter application data representing operating conditions of a liquid dispensing application; a control circuit connected to said input device and operable to receive said application data representing operating conditions of a liquid dispensing application, said control circuit having one of a software algorithm and a look-up table configured to process said application data and generate digital signals that define desired peak and hold current values corresponding to said application data; and a digitally programmable driver circuit connected between said control circuit and said electromagnetic coil, said digitally programmable driver circuit comprising a non-volatile memory for storing said desired peak and hold current values, said digitally programmable driver circuit operable to generate a desired current waveform in response to said desired peak and hold current values and apply said desired current waveform to said electromagnetic coil for moving said dispensing valve stem toward and away from said dispensing orifice.