Medical fluid machine having solenoid control system with temperature compensation
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorJohn Bedingfield
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Abstract
A medical fluid machine having a solenoid control system with temperature compensation includes an electromechanical solenoid including an armature and a coil, a voltage source, a switching device configured to selectively apply power from the voltage source to the solenoid coil, and a control element connected electrically to the switching device and operable to receive at least one signal indicative of a resistance of the coil and using the signal to control the switching device to selectively apply power from the voltage source to the solenoid coil.
Claims21
An electromechanical solenoid control system comprising:
- an electromechanical solenoid including an armature and a coil;
- a voltage source;
- a switching device configured to selectively apply power from the voltage source to the solenoid coil;
- and
- a control element connected electrically to the switching device and operable to receive at least one signal indicative of a resistance of the coil and use the signal to control the switching device to selectively apply power from the voltage source to the solenoid coil to optimize a variable hold power.
An electromechanical solenoid control system comprising:
- an electromechanical solenoid including an armature and a coil;
- a power source configured to power the coil;
- and
- a control element configured to:
- (i) determine a coil resistance from a coil voltage drop and a coil electrical current;
- (ii) determine a coil temperature from the coil resistance;
- and (iii) adjust power from the power supply to the coil using the coil temperature.
An electromechanical solenoid control system comprising:
- a power supply;
- an electromechanical solenoid including an armature and a coil;
- a control element configured to (i) determine a temperature of the coil and (ii) raise power from the power supply to the coil to compensate for an inefficiency caused when the coil temperature is higher.
Dependencies are inferred from the claim text.