Patent ID: 7161787
Filing Date: 2007-01-09
Classification: H03K

Abstract:
1. A pharmaceutical fluid dispensing system, where fluid is dispensed in response to the actuation of a solenoid, and where said solenoid is controlled by a system comprising: a power switch, having first and second contacts, such that the passage of current between said first and second contacts is determined by the state of an input signal, said second contact in communication with said solenoid, the timing of which is affected by the voltage applied to said solenoid and the temperature of said solenoid, such that the assertion of said input signal allows current to flow through said solenoid; and a circuit for selecting a voltage to be applied to said first contact, said circuit enabling the selection of a first voltage prior to the assertion of said input signal in order to set said solenoid and, after a delay after said assertion, the selection of a second voltage, lower than said first voltage.