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 0:
1. A method of determining a lifetime parameter of a capacitor in a failsafe device, the method comprising:
positioning an actuator of the 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;
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;
determining an amount of energy required to return the actuator of the failsafe device 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; and
comparing the amount of energy to the effective capacitance to determine the lifetime parameter of the capacitor.