Electricity meter with multiple gains signal to an A/D converter

摘要

An auto-ranging electricity meter circuit having multiple current signal paths. Each of the current signal paths are amplified by a different amount of gain, and then applied to an ADC. The ADC then converts each of the amplified signals at different gains in a continuous process. The system analyzes the different sets of samples to determine which is the most accurate to use. Advantages include improved accuracy of an electricity meter using a lower cost A/D converter.