Patent ID: 11949224
Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. The method of claim 12, wherein initiating the latch-off timer comprises:
generating a latch voltage in response to a logic transition from a first state to a second state of the overvoltage signal; and
maintaining the latch voltage in response to a logic transition from the second state to the first state of the overvoltage signal to charge a timing capacitor to generate a timing voltage corresponding to the latch-off timer;
wherein determining the persistent overvoltage fault comprises:
comparing the timing voltage with a threshold voltage;
providing a timer signal in response to the timing voltage being approximately equal to the threshold voltage corresponding to expiration of the latch-off timer; and
generating the fault signal in response to the timer signal and in response to at least one programmable condition.