Power outage timer
First Claim
1. In an electronic watt-hour meter operated by a microprocessor and having connected thereto a real time value electrically alterable read only memory and a real time clock signal input, the improvement comprising:
- a power outage/loss of voltage timing means, coupled to the microprocessor, for generating a signal after power is restored to said microprocessor following a power outage, such signal being indicative of the time duration of the power outage when the watt-hour meter was inoperative and being input to the microprocessor so that the microprocessor updates the real time value in the electrically alterable read only memory to reflect the correct real time in the memory.
2 Assignments
0 Petitions
Accused Products
Abstract
The power outage timer (36, 136, or 236) forms a part of an electronic watt-hour meter (10) having a microprocessor (22), a real time value memory and a real time clock signal input from a voltage supply (23). The power outage timer (36, 136, or 236) is coupled to the microprocessor (22) for generating a signal when, after a power outage, power is restored, such signal being indicative of the time duration of the power outage and being input to the microprocessor (22) so that the microprocessor (22) can update the real time value in an EAROM (32) to reflect the correct real time.
61 Citations
7 Claims
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1. In an electronic watt-hour meter operated by a microprocessor and having connected thereto a real time value electrically alterable read only memory and a real time clock signal input, the improvement comprising:
a power outage/loss of voltage timing means, coupled to the microprocessor, for generating a signal after power is restored to said microprocessor following a power outage, such signal being indicative of the time duration of the power outage when the watt-hour meter was inoperative and being input to the microprocessor so that the microprocessor updates the real time value in the electrically alterable read only memory to reflect the correct real time in the memory. - View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification