Inverter system with input signal-processing apparatus and...

Details Inverter system with input signal-processing apparatus and... Inverter system with input signal-processing apparatus and...

2008-01-31

2009-06-23

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S117000, C341S119000, C341S155000

Reexamination Certificate

active

07551108

ABSTRACT:
An Inverter system includes a comparator unit compares an analog input voltage with at least one voltage threshold to judge a voltage range for the input voltage. A DC-offset unit determines a DC-offset value to limit the input voltage within a predetermined bound. The input voltage is level-shifted and amplified by a non-inverting adder unit according to the DC-offset value and a fixed gain, and then processed by an analog to digital converter (ADC) to obtain a digital count value. A microcontroller unit calculates an original value for the input analog voltage according to the voltage range and the digital count value. When the analog input voltage could be negative value, a full-wave rectifier unit and a polarity judgment unit are used to find an absolute value and a polarity of the analog input voltage for further processing.

REFERENCES:
patent: 5742496 (1998-04-01), Tsutsumi
patent: 6169670 (2001-01-01), Okubo et al.
patent: 2005/0281067 (2005-12-01), Deng et al.
patent: 2007/0247876 (2007-10-01), Garabandic

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