Time Based AC Line Detection

摘要

A power supply detection system and method for determining the AC mains voltage range when a device (e.g., LED based bulbs) is indirectly connected to the AC mains and the device does not receive the complete sinusoidal AC mains signal.

主权项

1. A method for determining a voltage range of a voltage source, the voltage source generating sinusoidal signals, comprising
receiving an input signal, said input signal having a first portion that is a sinusoidal signal that generally corresponds to a first portion of the voltage source signal, said input signal having a second portion that is not a sinusoidal signal that generally corresponds to a second portion of the voltage source signal; receiving a selected reference signal, wherein said selected reference signal is synchronized with the input signal; comparing said first portion of the input signal with a corresponding portion of the selected reference signal; and determining the voltage range of the voltage source based on said comparing step.