Electronic Electricity Meter Inductive Power Isolation

The patent introduces a current transformer as an intermediary device between the commercial power source and the electricity meter. The current transformer generates induced voltage from the magnetic field of the transmission line, which then charges a capacitor to provide power to the meter. This intermediary mechanism isolates the meter from direct connection to the power source, protecting it from surge voltages and temperature changes while maintaining continuous power supply capability.

The patent implements periodic action by using the capacitor to store energy during periods when power is available and then supplying stored energy during periods when the meter would otherwise consume power unnecessarily. The system monitors the charged state of the capacitor and can enter low-power modes or shut down non-essential functions when the capacitor charge level indicates sufficient stored energy, thereby eliminating continuous power consumption in unloaded states while maintaining power supply availability.

The patent merges the functions of voltage division, current transformation, and analog-to-digital conversion into a more integrated configuration. The current transformer serves dual purposes: it transforms the current for measurement and simultaneously generates induced voltage that can be directly fed to the A/D converter. This merging of functions reduces the number of separate components needed while maintaining the accuracy of analog-to-digital conversion.