Patent ID: 11870280
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 7:
8. A method of charging a capacitor in an actuator, the method comprising:
positioning an actuator of a failsafe device in an initial predetermined physical position as detected by the failsafe device;
measuring an initial voltage across the capacitor at the initial predetermined physical position of the actuator;
positioning the actuator in a failsafe predetermined physical position as detected by the failsafe device;
measuring a final voltage across the capacitor at the failsafe predetermined physical position of the actuator;
determining an amount of energy required to return the actuator from the initial predetermined physical position to the failsafe predetermined physical position based on the initial voltage and the final voltage;
measuring an effective capacitance of the capacitor;
determining, based on the effective capacitance and the amount of energy, a charge voltage for the capacitor; and
charging the capacitor using the charge voltage.