Power supply and power monitor for electric meter

An electronic register for an electric meter comprising:

• an electronic processor;
• said electronic processor including a volatile data storage;
• a non-volatile data storage;
• unregulated means for producing at least one unregulated DC voltage from an AC supply;
• regulated means for producing at least one regulated DC voltage from said unregulated DC voltage;
• means for storing a predetermined quantity of stored electric energy from said unregulated DC voltage;
• said means for storing being effective for providing a voltage to said regulated means of sufficient amplitude to maintain said regulated DC voltage from said regulated means at its regulated value for at least a first predetermined time following a loss of said AC supply;
• a low voltage timer;
• means for starting a timing cycle of said low voltage timer in response to said voltage from said means for storing decaying below a first threshold;
• means for resetting said low voltage timer in response to said voltage from said means for storing increasing above a second threshold;
• means responsive to said low voltage timer completing its timing cycle for writing at least some data from said volatile data storage into said non-volatile data storage;
• said means for storing having a capacity at least sufficient for maintaining functions of said processor until the completion of said timing cycle and said writing;
• and
• means responsive to a voltage from said regulated means passing a third threshold, lower than said regulated DC voltage, for resetting said electronic processor.