| 摘要 |
<p>POWER SUPPLY AND POWER MONITOR FOR ELECTRIC METER An electronic register for an electric meter includes a non-volatile storage into which data is written upon the detection of an impending power outage. A sufficient quantity of electric energy is normally stored in a capacitor to continue operation of the electronic register for a long enough period of time to complete the writing of data to the non-volatile storage. In order to prevent writing of the data to non-volatile storage in the presence of noise or momentary power outages, when the voltage in the capacitor decays to a point which indicates an impending power outage, a timer is started. If the voltage is not restored before the end of the timing cycle of the timer, then the data is written to the non-volatile storage. If the voltage is restored before the end of the timing cycle, then writing of the data to the non-volatile storage is prevented.</p> |
